Secondary battery

A secondary battery and conductive layer technology, applied in the direction of secondary batteries, secondary battery manufacturing, battery pack components, etc., can solve the problem of affecting battery safety and cycle life, welding position can not be accurately controlled, unfavorable process, quality control and other problems, to achieve the effect of easy flow operation, reliable and firm connection point of tabs, and guaranteed performance

Active Publication Date: 2014-03-12
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, it includes a cover plate 1 , a connector, a tab lead-out device, a second gasket 3 , and a winding core 7 . The tab lead-out device includes an insulating gasket 6 and a first gasket 5, wherein the insulating gasket 6 forms an insulating layer, and the first gasket 5 forms a conductive layer. The connecting piece includes a nut 2 and a screw 502 fixed on the first washer. The battery plate is wound into a cylindrical core 7, and there are multiple tabs 4 protruding from the core 7 at both ends. The tabs at one end are positive tabs, and the other ends are negative tabs. The connecting structure of the cover plate is the same.

[0047] The insulating spacer 6 is circular and is placed on the end face of the winding core 7. The structure of the insulating spacer 6 is as follows: figure 2 As shown, a hole 601 is opened thereon, and the hole 601 is a discontinuous sector. A first gasket 5 is stacked above the insulating g...

Embodiment 2

[0053] A secondary battery, including a cover plate, a connector, a tab lead-out device, a second gasket, and a winding core, the difference from Example 2 is that the tab lead-out device is a composite of an insulating layer and a conductive layer Structure. Such as Figure 7As shown, the tab lead-out device is divided into upper and lower layers, the upper layer is a conductive layer, and the lower layer is an insulating layer, and the tab passes through the hole on the tab lead-out device from below the insulating layer and is welded above the conductive layer.

Embodiment 3

[0055] A secondary battery, including a cover plate, a connector, a tab lead-out device, a second gasket, and a winding core. The difference between it and Embodiment 2 is that there is no hole on the tab lead-out device, such as Figure 8 As shown, the tab protrudes from the edge of the tab lead-out device from below the insulating layer and is welded above the conductive layer.

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Abstract

Provided is a secondary battery comprising a core (7), tabs (4) protruded from an end of the core (7), a tab lead-out device placed at the end of the core (7), and a cover plate (1). The tab lead-out device includes an insulating layer (6) adjacent to the end of the core (7) and a conductive layer (5) distant from the end of the core (7). The tabs (4) are electrically connected to the conductive layer (5). The conductive layer (5) is electrically connected to the cover plate (1). The secondary battery further comprises a connector and a pad (3) stacked between the conductive layer (5) of the tab lead-out device and the cover plate (1). The tabs (4) are compacted between the pad (3) and the conductive layer (5) of the tab lead-out device by the connector.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a connection structure between tabs and a cover plate of the secondary battery. Background technique [0002] A lithium-ion secondary battery consists of a negative plate, a positive plate, an electrolyte, and a separator interposed 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 stacked in sequence or spirally wound to form a battery core, and then the battery core is filled with stainless steel, nickel-plated iron, and aluminum metal Electrolyte is poured into the casing or laminated flexible film battery container, and sealed to form a battery. Wherein, the electrical conduction between the battery core and the outside world is realized through the connection between the lug connected to the pole plate and the pole or the cover...

Claims

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Application Information

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Patent Type & Authority Patents(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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