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Soft package battery shell insulation impedance test method

A soft pack battery, insulation resistance technology, applied in high resistance measurement, measurement of resistance/reactance/impedance, test of dielectric strength, etc., can solve the problem of not considering the influence of aluminum-plastic film insulation resistance, and achieve comprehensive test results. , The effect of the overall temperature equalization and the precision of quality inspection

Inactive Publication Date: 2020-12-18
马鞍山绿色兄弟科技有限责任公司
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Problems solved by technology

[0012] In order to make up for the deficiencies of the existing technology and solve the problem that the existing test methods do not consider the influence of the small damage of the aluminum-plastic film itself on the insulation resistance in the extreme environment, the insulation resistance of a pouch battery case proposed by the present invention testing method

Method used

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  • Soft package battery shell insulation impedance test method
  • Soft package battery shell insulation impedance test method
  • Soft package battery shell insulation impedance test method

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Embodiment approach

[0042] As an embodiment of the present invention, the extruding block 35 is provided with uniformly distributed telescopic grooves near the side of the test groove 3; a test probe 36 is fixedly connected in the telescopic groove; Connected with a sheath tube 37; the sheath tube 37 is used to protect the test probe 36; because the damage to the surface of the pouch battery caused by the test probe 36 affects its performance, the test probe 36 The diameter of the test probe 36 is small, so that the test probe 36 is susceptible to external shocks and deformation, thereby causing certain obstacles to the testing process. When working, press the pressing rod 34, and the pressing rod 34 extends to the third chute. The extrusion block 35 is extruded, so that the extrusion block 35 slides relative to the pouch battery. During the sliding process, the sheath tube 37 first contacts the side wall of the pouch battery, and as the extrusion block 35 continues to slide, the sheath The tube ...

Embodiment 1

[0051] The insulation properties of two kinds of aluminum-plastic films were compared in experiments. The aluminum-plastic film A and the aluminum-plastic film B were made into 30Ah soft-pack batteries according to the same design and process respectively, and then were tested according to the test method of the present invention:

[0052] 1. At room temperature, first adjust the pouch battery 9 to an 80% SOC state; then place the battery 9 in a high and low temperature box 8 with an ambient temperature of 25 degrees and a humidity of 45% RH;

[0053] 2. The insulation internal resistance tester 12 is outside the high and low temperature box 8, and the battery aluminum-plastic film case 11 is connected to the positive end of the insulation internal resistance tester 12 through wires, and the negative electrode ear 10 of the soft pack battery 9 is connected to the insulation internal resistance tester. The negative terminals of 12 are connected to each other; set the insulation ...

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Abstract

The invention belongs to the technical field of secondary battery aluminum-plastic film reliability detection, and particularly relates to a soft package battery shell insulation impedance test method. The system according to the method comprises a test box, a sealing cover and a temperature control assembly. The sealing cover is hinged on the test box; test grooves which are uniformly distributedare formed in the test box; the sealing cover is fixedly connected with a sealing gasket over against the test grooves; symmetrically designed first sliding grooves are formed in the two side walls of the test grooves; a temperature control plate is slidably connected in the first sliding grooves. Condensation pipes and heating wires are alternately arranged in the temperature control plate. A first cavity is formed in one side, close to the hinged side of the sealing cover, of the test box; the temperature control assembly is mounted in the first cavity; the temperature control assembly is composed of a regulator, a refrigerator and a heater. According to the invention, an extreme environment is mainly simulated, and the resistance value is tested in the extreme environment so that the insulation impedance test of the soft package battery shell is more comprehensive, and the measurement accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of reliability detection of aluminum-plastic films of secondary batteries, and in particular relates to a method for testing the insulation resistance of a soft pack battery shell. Background technique [0002] Flexible packaging secondary batteries have the highest single energy density, automatic pressure relief and explosion-proof function for internal overpressure gas, and good size adaptability. In recent years, they have taken an increasing share in the power battery market. The performance of the aluminum-plastic film packaging directly determines the reliability of the pouch battery. The inner layer of the aluminum-plastic film is a CPP layer. Damage to the CPP layer will lead to electrochemical corrosion. The process is as follows: the aluminum foil layer between the negative electrode and the aluminum-plastic film If the insulation is too small, there will be a certain electronic conduction; if at ...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R31/12
CPCG01R27/025G01R31/003G01R31/1263
Inventor 严崇张曼华钟思民
Owner 马鞍山绿色兄弟科技有限责任公司
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