351results about How to "Improve short circuit resistance" patented technology

The invention specifically relates to a current collector and application thereof, and a pole piece and a battery using the same, belonging to the field of batteries. The current collector of the invention comprises an insulating layer and a conducting layer, wherein the insulating layer is used for bearing the conducting layer; the conducting layer is used for bearing an electrode active materiallayer; and the normal-temperature film resistance Rs of the conducting layer is no less than 0.016 omega / sq and no more than 420 omega / sq. The current collector provided by the invention can greatlyincrease the short-circuit resistance of the battery in cases of abnormal conditions, allows short-circuit current to be greatly reduced, so heat produced by short circuits is greatly lowered, and heat produced at sites where internal short circuits occur can be totally absorbed by the battery; and thus, the influence of short-circuit damage to the battery is limited to certain points, only pointcircuit break occurs, and the normal operation of the battery in a short period of time is not affected.

The present invention provides a separator that, when used in a lithium ion secondary battery, polymer lithium secondary battery, aluminum electrolytic capacitor or electric double-layer capacitor, offers desired levels of various practical characteristics, undergoes minimal heat shrinkage even when overheated, and exhibits high reliability and excellent workability. The electronic component separator proposed by the present invention comprises a porous base made of a substance having a melting point of 180° C. or above, and a resin structure provided on at least one side of and / or inside the porous base, and the porous base and / or resin structure contains filler grains.

Disclosed are a separator for lithium ion secondary batteries, having an inorganic layer formed from inorganic particles, characterized in that the inorganic particles have a particle diameter distribution in which the 50% cumulative particle diameter D50 is in the range of 100 nm to 500 nm, the 10% cumulative particle diameter D10 is 0.5D50 or more, and the 90% cumulative particle diameter D90 is 2D50 or less; a method for manufacturing the separator; and a lithium ion secondary battery using the separator. When the separator is used, there can be produced a lithium ion secondary battery in which a short circuit caused by contraction or melting can be definitely prevented, as well as the current density applied to the electrodes during charging and discharging is uniform so that charging and discharging can be efficiently achieved.

An electrolytic capacitor includes a capacitor element, an electrolyte solution with which the capacitor element is impregnated, and an outer package enclosing the capacitor element and the electrolyte solution. The capacitor element includes an anode foil having a dielectric layer on a surface thereof, a cathode foil, a separator disposed between the anode foil and the cathode foil, and a solid electrolyte layer in contact with the dielectric layer of the anode foil and the cathode foil. The electrolyte solution contains a low-volatile solvent that is at least one of polyalkylene glycol and a derivative of polyalkylene glycol.

The invention relates to a transformer body structure for a single-phase traction transformer used for the AT power supply means, belonging to the transformer manufacturing technical field. The invention mainly comprises iron stems (15), a high voltage coil (1) and a low voltage coil (2) which are connected in series and are respectively arranged on two iron stems (15), etc, wherein, the low voltage coil has a radial splitting structure and consists of two or four coils; fiber container oil clearance insulating structures (13) are arranged between the two or four coils; the head end (3) of the high voltage coil has an interleaved winding structure; other sections of the high voltage coil have continuous winding structures; electrostatic rings (7) are arranged between the head end (3) and the tail end (4) of the high voltage coil and end rings; two angle rings (9) are symmetrically arranged between layers of the head end (3) and the tail end (4) of the high voltage coil and an yoke insulating layer (8). The overall structure design is reasonable; the transformer body structure has reliable insulating strength and overloading and short circuit resistant capabilities and can meet the requirements of the prior electrified railways.

The invention discloses a non-punch-through deep trench IGBT with a field stop structure and a manufacturing method thereof. The IGBT is equivalent to one NMOS field-effect tube driving one PNP bipolar transistor or one PMOS field-effect tube driving one NPN bipolar transistor. The NMOS tube or the PMOS tube in the invention realizes a vertical gate and a vertical trench through a deep trench technology and a high voltage-resistant trench gate technology is adopted; the NMOS tube or the PMOS tube and the PNP tube or the NPN tube are directly manufactured on a polished wafer to form a non-punch-through IGBT structure; and a field stop layer with the same doping type as a base region and with doping concentration higher than the base region is formed in the base region of the PNP tube or the NPN tube at a position close to a collector region through ion implantation or diffusion. The invention has the advantages that the cost of the manufacturing method is low and the implementation is easy; and the area of the manufactured IGBT is small, the switching loss is small, the short-circuit tolerance is high, the anti-electromagnetic interference capacity and the radiation resistance are enhanced and the like. Thereby, the demand of the market on the high quality of IGBT products is satisfied.

The invention relates to the battery field, in particular to a current collector, a pole piece of the current collector and a battery. The current collector comprises an insulating layer and a conducting layer, wherein the insulating layer is used for bearing the conducting layer; the conducting layer is used for bearing an electrode active material layer, the conducting layer is located on at least one surface of the insulating layer, and the thickness of the conducting layer is D2, wherein D2 meets the relation of 300nm<=D2<=2 microns; the current collector also comprises a protective layerarranged on at least one surface of the conducting layer. Through the current collector, short-circuit resistance generated in a short circuit when the battery is abnormal can be increased, so that ashort-circuit current is substantially reduced, short-circuit heat output is greatly lowered, and the safety of the battery is improved; meanwhile, the protective layer can improve the mechanical strength of the conducting layer, so that the safety of the battery is further improved; and besides, the conducting layer can be prevented from being damaged or subjected to oxidation, corrosion and other phenomena, so that the working stability of the current collector is remarkably improved, and the service life of the current collector is remarkably prolonged.

The present invention relates to the battery field, especially to a current collector. The current collector comprises a support layer, conductive layers and a conductive material, the conductive layers are located on the two surfaces of the support plate, the current collector is internally provided with a plurality of holes penetrating the support layer and the conductive layers, the holes are filled with the conductive material. The current collector can improve the short-circuit resistance of the battery in the case of short circuit under abnormal conditions, and can greatly reduce the short-circuit current. Therefore, the short-circuit heat generation amount can be greatly reduced, and the safety performance of the battery is improved.

The invention relates to a separation membrane for a gel-state polymer lithium-ion battery. The separation membrane is prepared by using a separation membrane body made of polypropylene and polyethylene materials as a substrate, and coating a layer of polymer colloid material and inorganic filler coating on the surface of substrate. The thickness of the polymer colloid material and inorganic filler coating is 1-5 mu m, and porosity of the separation membrane subjected to coating treatment ranges from 30%-50%. The polymer colloid material is a mixture composed of polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyacrylonitrile and polymethyl methacrylate. The inorganic filler is composed of nanoscale inorganic powder material aluminium oxide, silica or their mixture, and the granularity ranges from 50nm to 200nm. The lithium-ion battery manufactured by the separation membrane is good in safety, short circuit resistance, needling resistance, impact resistance and extrusion resistance of the battery are improved, and the separation membrane for the gel-state polymer lithium-ion battery can be widely used in the field of electromobiles, electric motor cars, electric bicycles, large-medium type energy-storage batteries, photovoltaic stations and the like.

The invention relates to the field of batteries, in particular to a current collector as well as a pole piece and a battery and an application thereof. The current collector comprises an insulation layer with a supporting function and a conductive layer with a conductive and current collection function, wherein a normal-temperature thin-film resistance RS of the conductive layer satisfies: RS is greater than or equal to 0.01 omega and less than or equal to 0.15 omega. By adopting the current collector, the short-circuit resistance when in short circuit under the abnormal condition of a batterycan be greatly increased, so that the short-circuit current is greatly reduced, the short-circuit heat can be greatly reduced, and the safety performance of the battery can be greatly improved; and in addition, due to the small heat yield, the heat produced at a point having the internal short circuit can be completely absorbed by the battery, the temperature increase of the battery is small, sothat the influence of the short-circuit damage for the battery can be limited in a range of the point, and only the point short circuit is formed without influencing the normal work of the battery ina short time.

To provide a high power non-aqueous electrolyte secondary battery with high performance and less degradation in capacity even when high power discharge is repeated while maintaining the initial output characteristic by optimizing the insulating structure between the positive and negative electrodes, in a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, a microporous resin separator and an electrolyte, an area per theoretical capacity of the positive electrode is set to 190 to 800 cm2 / Ah and a porous heat-resistant layer having a thickness of 10 to 60 μm is provided between the separator and at least one of the positive electrode and the negative electrode.

An electrolytic capacitor includes a capacitor element, an electrolyte solution with which the capacitor element is impregnated, and an outer package enclosing the capacitor element and the electrolyte solution. The capacitor element includes an anode foil having a dielectric layer on a surface thereof, a cathode foil, a separator disposed between the anode foil and the cathode foil, and a solid electrolyte layer in contact with the dielectric layer of the anode foil and the cathode foil. The electrolyte solution contains a low-volatile solvent that is at least one of polyalkylene glycol and a derivative of polyalkylene glycol.

The invention relates to the field of batteries, in particular to an electrode plate and an electrochemical device. The electrode plate comprises a current collector, an electrode active material layer arranged on at least one surface of the current collector, and an electric connection component electrically connected with the current collector, the current collector comprises a supporting layerand a conductive layer arranged on at least one surface of the supporting layer, the thickness D2 of a single surface of the conductive layer satisfies the following formula: D2<=D2<=1. D2 is greaterthan or equal to 30nm and less than or equal to 3[mu]m; the supporting layer is a high polymer material layer or a high polymer composite material layer; the electrode active material layer comprisesan electrode active material, a binder and a conductive agent; seen from the width direction of the coated surface of the electrode plate, the coated electrode active material layer comprises 2n+1 (n=1, 2 or 3) areas based on the compaction density, the compaction density of the middle area is higher than the compaction density of the two side areas, and a support protection layer is arranged on the surface of the extension area of the current collector.

Provided is a lithium ion secondary battery including, as components accommodated in a container, a positive electrode that intercalates and deintercalates lithium, a negative electrode that intercalates and deintercalates lithium, a nonaqueous electrolytic solution that contains a lithium salt, and a separator that is interposed between the positive electrode and the negative electrode. The separator includes a porous resin layer containing polyolefin as a main component.In a full charge state, when observing a cross-section of the lithium ion secondary battery after performing a nail penetration test in which a metal nail having a diameter of 3 mm penetrates through a central portion of the lithium ion secondary battery at 80 mm / sec for short-circuiting of the lithium ion secondary battery, an average thickness of the porous resin layer in a range of 1 mm to 3 mm in an in-plane direction from a peripheral edge of a nail hole is equal to or greater than 10% of an average thickness of the porous resin layer before the nail penetration test, and the porous resin layer remains at a position within 1 mm in the in-plane direction from the peripheral edge of the nail hole.

The present invention discloses a positive electrode current collector, a positive electrode sheet and an electrochemical device. The positive electrode current collector comprises: a support layer having two opposite surfaces in the thickness direction thereof; and a conductive layer disposed on at least one of the two surfaces of the support layer; wherein the thickness D1 of the conductive layer is greater than or equal to 300nm and less than or equal to 2mu m, and preferably, the thickness D1 is greater than or equal to 500nm and less than or equal to 1.5 mu m; and when the tensile strainof the positive electrode current collector is 1.5%, the square resistance growth rate T of the conductive layer is less than or equal to 30%. The positive electrode current collector provided by theinvention can give consideration to relatively high safety performance and electrical performance at the same time, so that the positive electrode piece and the electrochemical device adopting the positive electrode current collector can give consideration to relatively high safety performance and electrochemical performance at the same time.

Disclosed is a semiconductor device. The semiconductor device comprises at least one cell, and the structure of any cell comprises an N-type substrate, at least one N-type carrier barrier region, andat least one P-type electric field shielding region, wherein at least one first groove unit and at least one second groove unit are included on one side of the N-type substrate; at least one P-type semiconductor region is arranged on the other side of the N-type substrate, wherein the P-type semiconductor region is referred to as an anode region. The invention aims to provide the semiconductor device, wherein the semiconductor device has a novel cellular structure so as to obtain a large safe operating area, and the anti-short-circuit capability; the effect of a parasitic thyristor is eliminated; the low-grid-collector charges (QGC) are adopted to obtain the maximum anti-dv / dt capability; the emitter side electric conduction modulation is added, so that a relatively large current density and an extremely low conducting voltage drop can be obtained; and relatively turn-off loss and relatively low process complexity are achieved.

A body of a shell type amorphous alloy transformer comprises an amorphous alloy shell type iron core (1) and rectangular coils which are alternatively arranged, and a U-shaped epoxy resin insulating clamp (3) is arranged outside an iron yoke (31) of the amorphous alloy shell type iron core (1). Square type frameworks (5) are respectively arranged on the upper portion and the lower portion of the iron core (5) outside each phase winding (2), and the phase winding is clamped by the square type frameworks (5) through an insulating plate (6). An intermediate section of box body and a lower section of box body in a transformer with an oil box or a gas box can stretch the square type framework (5) of each phase winding through a breast beam and box walls, thereby facilitating the short-circuit force of the phase winding to transfer to the square type framework (5) and the oil box walls. A coil support plate (4) which is formed by insulating elements is arranged on the inner side of the phase winding (2), which can lead the crosswise force of a coil not to press the amorphous alloy shell type iron core (1) when the coil is in short-circuit. The intermediate section of box body and the lower section of box body are used to position the iron core through the U-shape clamp (3). A dry transformer is used to fix the iron core (1) through an upper location press plate and a lower location press plate (27).

The invention belongs to the technical field of power semiconductors, and particularly relates to a self-adaptive SOI LIGBT device. Compared with a traditional structure, the self-adaptive NMOS structure is introduced into the collector electrode end, and a Zener diode structure is introduced into the emitter electrode end. During forward conduction, the NMOS channel at the collector end is closed, an electron extraction path at the collector end is blocked to eliminate the voltage turn-back effect, and at the moment, the Zener diode is reversely biased but is not broken down, and holes storedin the drift region cannot be extracted, so that the new device can obtain low forward conduction voltage drop. In the turn-off process, along with rise of collector voltage, the collector NMOS channel is adaptively opened to form the electron extraction path, the Zener diode is reversely broken down and conducted to extract an emitter end hole, and the NMOS channel and the Zener diode accelerateturn off of the device to reduce the turn-off loss; and in a short-circuit state, the Zener diode is reversely broken down and conducted, so that the saturation current density can be reduced to improve the short-circuit resistance. Therefore, the device has smaller conduction voltage drop and turn-off loss, and a wider safety working area.

The invention relates to a winding method in a high-capacity transformer and other electrical equipment, in which coils are in the form of double-single spiral type and transposition wires are utilized. When the coil is wound, the winding is started according to double spirals, namely two single spirals are wound simultaneously to form two lines of single spiral coils, and transposition is carried out in each line of spiral according to the single spiral coil. The detailed steps are as follows: lead wires are divided into groups, the lead wires in each single spiral coil are transposed in the form of within group transposition->between groups transposition->within group transposition, and arc filling blocks D are positioned at the gaps at transpositions of lead wires. The method has the characteristics of reducing the thickness of lead wires overlap, improving the fill rate of coils, increasing the mechanical strength and the short-circuit resistance capacity of coils, and reducing the hidden troubles of transpositions and the like.

The invention discloses a damping type automatic -passing phase separation switching device for electrified railways. A gap (S1) between a neutral section and a first contact net (A) is in bridge joint with a first high-voltage switch (K1) of a first current transformer (H1); the neutral section is provided with an insulating sectioned gap (SR) which is in bridge joint with a resistor (R); a gap (S2) between the neutral section and a second contact net (B) is in bridge joint with a second current transformer (H2); and an output end of the first current transformer (H1), an output end of the second current transformer (H2) and a control end of the first high-voltage switch (K1) are all connected with a measuring and control unit. Transient overvoltage and overcurrent possibly caused by frequent switching of the high-voltage switch can be better avoided by the damping type automatic -passing phase separation switching device, automatic-passing phase separation of a train can be safely and reliably realized, and operating cost and maintenance cost of the train are saved.

The present invention relates to a lithium manganate plastic housing cylindrical battery and a preparation method thereof, wherein the battery is applicable for lithium ion batteries having a medium-large capacity. According to the method, a lithium manganate material, an electric conduction agent, a binder and the like are mixed to obtain a positive electrode slurry; graphite, an electric conduction agent, a binder and the like are mixed to obtain a negative electrode slurry; the positive electrode slurry is coated on an aluminum foil to prepare a positive electrode sheet; the negative electrode slurry is coated on a copper foil to prepare a negative electrode sheet; the positive electrode sheet and the negative electrode sheet are added to a specially designed diaphragm to carry out rolling to obtain a cylindrical rolling core; the rolling core, a plastic housing, end caps, an upper post terminal, a lower post terminal, an inner gasket, an outer gasket and fixation nuts are assembled; and finally liquid injection formation is performed to prepare the finished battery. The present invention relates to a lithium manganate plastic housing cylindrical battery and a preparation method thereof, the method has advantages of convenient assembly, high production efficiency and low cost, and battery safety performances such as short circuit resistance, needling resistance, impact resistance, extrusion resistance and the like can be improved by using the specially designed diaphragm.

The present application relates to the field of batteries, and in particular, to a current collector and a pole piece thereof, and an electrochemical device. The current collector comprises an insulating layer and a conducting layer, wherein the conducting layer is positioned on at least one surface of the insulating layer, and the normal-temperature film resistance RS of the conducting layer meets the inequation as shown in the description; a plurality of holes penetrating the insulating layer and the conducting layer are formed in the current collector. The current collector can improve the short-circuit resistance of the battery in the case of short circuit under the abnormal condition, so that the short-circuit current is greatly reduced, the short-circuit heat production is greatly reduced, and the safety performance of the battery is improved; the plurality of holes arranged in the current collector can facilitate pass of the electrolyte, can reduce the polarization of the pole plate and the battery and can improve the electrochemical performance of the battery; and moreover, the holes arranged in the current collector can further reduce the weight of the current collector and can improve the weight energy density of the battery.

A lithium secondary battery that is excellent in resistance to short-circuits and heat, is unlikely to suffer a capacity loss due to impact such as dropping, and has a high capacity. The lithium secondary battery includes: an electrode assembly including a strip-like positive electrode and a strip-like negative electrode that are wound together with a porous heat-resistant layer interposed therebetween; a non-aqueous electrolyte; and a battery can. The battery has a restricting part for restricting vertical movement of the electrode assembly. The distance A from the restricting part to the inner bottom face of the battery can and the width B of the negative electrode satisfy the relation: 0.965<=B / A<=0.995.

A capacitor separator having excellent impedance characteristics and short-circuiting resistance, and allowing the capacitor to be reduced in size and / or increased in capacitance; and a capacitor in which the separator is used are provided. The separator for the capacitor includes a porous film made of cellulose dissolved and regenerated without forming a cellulose derivative (A) and a fibrous component (B), for example, the fibrous component (B) can be one or more kinds of fibers selected from a plant-based pulp, regenerated cellulose fiber, cellulose fiber, animal fiber, inorganic fiber, and synthetic fiber that are available as paper raw material. The regenerated cellulose (A) can be obtained by forming in a film form a cellulose solution made by dissolving cellulose in an amine oxide solvent, immersing the resulting cellulose solution in water or a poor solvent of the amine oxide solvent so as to coagulate and regenerate the cellulose, washing the regenerated cellulose with water to remove the amine oxide solvent, and drying the resulting cellulose, and therefore the porous film is a porous film the chlorine content of which is 2 ppm or below, the sulfate content of which is 10 ppm or below, the thickness of which is 3-70 mum, the density of which is 0.1 g / cm<3> or above, and the average pore diameter of which is 5 mum or below. The capacitor is characterized by adopting the separator.

Provided is a transformer high temperature index selfadhesive transposed conductor and the preparation method, belonging to the technical field of the transformer, which solves the problems of low transposed conductor high temperature bonding strength, with the technical projects of consisting of a plurality of enamelling copper flat wire, wherein the surface of the enamelling copper flat wire is coated with the acetal paint film and the selfadhesive paint film from the interior to the exterior. The invention is improved in that, the selfadhesive paint composing the selfadhesive paint film is made of the following materials by weight: low molecular weight epoxy resin 140-160, bisphenol A90-100, quaternary ammonium salt 0.90, cresol 290-310, phenol 260-280, dimethylbenzene 370-390, aminoresin 3-4. The transposed conductor prepared according to the invention has the bonding strength in the operation temperature 75% of that in the normal temperature, and the integral bending strength is two times than that before drying, so the transposed conductor transformer advances the mechanical strength and the anti-short circuit ability of the winding, to bear larger electromagnetic force, thereby prolonging the service life of the transformer.

The invention relates to a 66kV burst short circuit transformer. A three-phase three-limb iron core is arranged in a lower fuel-saving box of the transformer. The iron core is sleeved with a low-voltage coil and a high-voltage coil. Wires are led out from the head end of the high-voltage coil and the head end and tail end of the low-voltage coil in the axial direction, and are led into a sleeve through cables. The high-voltage coil is of a fully continuous structure, wherein every two of three composite conductors are wound in parallel in the radial direction. A subsidiary pressing plate on the high voltage side and a subsidiary pressing plate on the low voltage side are respectively of a fan shape as a whole, and the fan-shaped subsidiary pressing plate on the high voltage side and the fan-shaped subsidiary pressing plate on the low voltage side share the same center of a circle and are placed in a symmetric mode. The subsidiary pressing plates and a pressing plate are provided with positioning holes and are connected through an insulating screw rod. According to the 66kV burst short circuit transformer, the insulation structures of the coils are optimized, ampere-turn balance of the coils is improved, horizontal eddy current loss of the coils is lowered on the premise that insulation reliability is guaranteed, the stress level of the coils is lowered substantially at the time of a short circuit, the capability in resistance to the short circuit of a product is enhanced, and a basis is provided for further optimization of a product design.

[Problem] To provide a separator for an aluminium electrolytic capacitor and an aluminium electrolytic capacitor, the separator exhibiting excellent impedance characteristics and short-circuiting resistance, and comprising a cellulose porous membrane manufactured using an amine oxide cellulose solution. [Solution] A separator for an aluminium electrolytic capacitor and an aluminium electrolytic capacitor that is characterised by using the separator, the separator being formed from a cellulose porous membrane that comprises regenerated cellulose that has been dissolved and regenerated without forming a cellulose derivative, the cellulose porous membrane comprising regenerated cellulose that is obtained by forming a cellulose solution, which is cellulose dissolved in an amine oxide solvent or the like, into a membrane, solidifying and regenerating cellulose by immersing the membrane in water or a poor solvent of an amine oxide solvent, and, after having removed the amine oxide solvent from the regenerated cellulose, drying the result.

The invention discloses a direct-current relay capable of resisting short circuit current and extinguishing arc. The direct-current relay comprises two static contact leading-out ends, a straight sheet type movable contact spring and a push rod part, , and further comprises a fixed upper yoke, a follow-up upper yoke and a lower armature. The fixed upper yoke is fixed above the push rod part corresponding to the position between the two movable contacts of the movable contact spring, the follow-up upper yoke is fixed in the push rod part corresponding to the position above the movable contact spring, and the lower armature is fixed on the bottom end surface of the movable contact spring corresponding to the position; the fixed upper yoke, the follow-up upper yoke and the lower armature arerespectively distributed along the width of the movable contact spring, and two magnetic conductive rings are formed on the width of the movable contact spring. The electromagnetic attraction force can be increased, so that the short circuit resistance of the product is greatly improved, and the short circuit resistance current reaches the level of 16 kA.

The invention discloses a heat-resistant self-sticking transposed wire for transformers and a manufacturing method thereof. Two rows of heat-resistant self-sticking enameled flat wires, having mutually contacted wide faces, are arranged within an outer insulating layer. Middle lining paper is arranged between the two rows of heat-resistant self-sticking enameled flat wires in such a manner that the middle lining paper is transposed in a same direction above and below the two rows of heat-resistant self-sticking enameled flat wires along their narrow faces. Each heat-resistant self-sticking enameled flat wire comprises a rectangular conductor, the cross section of the rectangular conductor is rounded, the outside of the rectangular conductor is coated with a primer film, and the outside of the primer film is coated with a finish film. From view of the cross section of the heat-resistant self-sticking enameled flat wires, the wide side of each primer film is concavely arced, and the outline of each finish film is a rectangle rounded. The heat-resistant self-sticking transposed wire has the advantages that mechanical strength of the transformer windings under high temperature can be effectively improved, short circuit resistance of the transformer windings is improved, and the service lives of the transformer windings are prolonged.

A body holding apparatus of a transformer belongs to the manufacturing technical field of matching accessories of transformers. The body holding apparatus mainly comprises a coil pressure plate (9) and an iron core upper clamping piece (1) installed at the upper part of a coil (10), a washer (8) equipped with a lock block sheath (7) and installed on the coil pressure plate (9), a belleville spring (6) and a lock block (5) installed in the lock block sheath (7), and a compressing screw rod (4) equipped with a screw nut (2) and a connecting piece (3) and installed on the lock block (5). One end of the connecting piece (3) is fixedly welded with the iron core upper clamping piece (1). The body holding apparatus has the advantages of reasonable integral structure design, low cost and simple installment, and can overcome the defects that when the transformer is transported, the coil and the coil pressure plate separate from each other due to the shock caused in turning, sudden braking, bumping and normal and safe running of a transport vehicle, thereby ensuring that the coil pressure plate can stand a sustained pressure and the compactness of the structure of the body, and improving the transformer resistance to short-circuit.