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Secondary battery

A secondary battery, conductive layer technology, applied in secondary batteries, secondary battery manufacturing, battery pack components, etc., can solve problems affecting battery safety and cycle life, inability to precisely control welding positions, unfavorable processes, and quality control and other problems, to achieve the effect of easy flow operation, reliable and firm connection points of the tabs, and guaranteed performance.

Active Publication Date: 2009-12-16
SHENZHEN BAK POWER BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the current process, the tabs are generally welded to the poles of the cover plate. When a large current is discharged, such as when used on a hybrid electric vehicle (HEV) or a pure electric vehicle (EV), if the tabs and poles, etc. Poor connection or connection failure will lead to severe heating, resulting in excessive battery temperature and battery failure in serious cases, affecting the safety and cycle life of the battery, especially when there are multiple tabs connected to the poles, the welding position Can not be precisely controlled, which is not conducive to process and quality control

Method used

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Examples

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Embodiment 1

[0046] A secondary battery such as figure 1 As shown, the cover plate 1, the connecting piece, the tab lead-out device, the second gasket 3, and the winding core 7 are included. The tab lead-out device includes an insulating pad 6 and a first pad 5, wherein the insulating pad 6 constitutes an insulating layer, and the first pad 5 constitutes a conductive layer. The connecting piece includes a nut 2 and a screw 502 fixed on the first washer. The battery plates are wound into a cylindrical winding core 7, with a plurality of tabs 4 extending out of the core 7, one of which is a positive tab, and the other end is a negative tab. The tabs at both ends are connected with The connection structure of the cover plate is the same.

[0047] The insulating gasket 6 is circular and placed on the end face of the winding core 7. The structure of the insulating gasket 6 is as follows: figure 2 As shown, a hole 601 is opened thereon, and the hole 601 is an intermittent fan shape. A first gasket...

Embodiment 2

[0053] A secondary battery includes a cover plate, a connecting piece, a tab lead-out device, a second gasket, and a winding core. The difference from Embodiment 2 is that the tab lead-out device is a composite of an insulating layer and a conductive layer. Structure. Such as Figure 7 As shown, the tab extraction device is divided into upper and lower layers. The upper layer is a conductive layer and the lower layer is an insulating layer. The tabs pass through the pores on the tab extraction device from below the insulating layer and are welded on top of the conductive layer.

Embodiment 3

[0055] A secondary battery includes a cover plate, a connecting piece, a tab lead-out device, a second gasket, and a winding core. The difference from Embodiment 2 is that the tab lead-out device is not provided with a hole, such as Figure 8 As shown, the tabs extend from the edge of the tab lead-out device from below the insulating layer and are welded on top of the conductive layer.

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Abstract

The invention discloses a secondary battery comprising a winding core and a cover plate, wherein the end part of the winding core extends with a pole lug and is also provided with a pole lug leading device placed on the end part of the winding core, the pole lug leading device is provided with an insulating layer contacted with the end part of the winding core and a conducting layer far away from the end part of the winding core, the pole lug is electrically connected with the conducting layer, and the conducting layer is electrically connected with the cover plate. The secondary battery also comprises a connecting piece and a second spacer arranged between the conducting layer of the pole lug leading device and the cover plate in an overlapping way, and the pole lug is tightly pressed between the second spacer and the conducting layer of the pole lug leading device by the connecting piece. The secondary battery is provided with the pole lug leading device, and the pole lug is welded on the pole lug leading device and is mechanically contacted with and tightly pressed on the pole lug leading device through the second spacer, thereby the invention ensures the pole lug of an electric core to be reliably connected with a pole column, reduces the internal resistance of a battery, ensures the firm fixing of the winding core, has simple assembly technology, is adapted to line production and suitable for batteries of a hybrid electric vehicle with multiple pole lugs and a large volume and a pure electric vehicle and can also be suitable for large-sized energy storage batteries.

Description

Technical field [0001] The invention relates to a secondary battery, in particular to a connection structure between a tab and a cover plate of the secondary battery. Background technique [0002] The lithium ion secondary battery is composed of a negative plate, a positive plate, an electrolyte, and a separator between the positive and negative plates to prevent short circuits. The positive plate and the negative plate are made into thin plates or foils, and then the electrode plates and the intervening separator are sequentially stacked or spirally wound to form a battery core, and then the battery core is filled with stainless steel, nickel-plated iron, and aluminum. The outer shell or laminated flexible film battery container is filled with electrolyte and sealed to make the battery. Among them, the electrical conduction between the battery cell and the outside world is realized by the connection of the tab connected with the pole plate and the pole or cover plate. [0003] I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/20H01M2/26H01M2/06H01M2/22H01M10/40H01M50/147H01M50/179H01M50/528H01M50/531H01M50/536
CPCY02E60/12H01M2/0404H01M2/22H01M10/0431H01M2/26Y02E60/10H01M50/147H01M50/528H01M50/536H01M50/531
Inventor 刘道坦刘照宽黄荣光郭春泰
Owner SHENZHEN BAK POWER BATTERY CO LTD
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