Connection structure of lugs and cover plate of battery

A technology for battery tabs and connection structures, applied in structural parts, battery pack components, circuits, etc., can solve problems such as affecting battery safety and cycle life, inability to precisely control welding positions, unfavorable processes, and quality control. The effect of easy flow operation, reliable and firm connection points of the tabs, and increased effective contact area

Inactive Publication Date: 2010-02-17
SHENZHEN BAK 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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  • Connection structure of lugs and cover plate of battery
  • Connection structure of lugs and cover plate of battery
  • Connection structure of lugs and cover plate of battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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.

[0045] 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

[0051] 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 7 As 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

[0053] 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

The invention discloses a connection structure of lugs and a cover plate of a battery, which comprises the lugs and the cover plate, wherein the lugs are led out from the end of a battery coil core and are also provided with a lug lead-out device arranged at the end of the coil core; the lug lead-out device is provided with an insulation layer contacting the end of the coil core and a conductive layer far away from the end of the coil core; the lugs are electrically connected with the conductive layer; and the conductive layer is electrically connected with the cover plate. The connection structure also comprises a connecting piece and a second gasket stacked between the conductive layer of the lug lead-out device and the cover plate; and the connecting piece tightly compresses the lugs between the second gasket and the conductive layer of the lug lead-out device. The lugs are connected to the lug lead-out device and are mechanically compressed through the second gasket so as to ensurereliable connection of the lugs and the cover plate, reduce the inner resistance of the battery and ensure firm fixation of the coil core. The connection structure is simple in assembly process, is suitable for line production and is suitable for assembling the batteries of hybrid electric automobiles with multiple lugs and large volume and pure electric automobiles or is used for assembling large storage batteries.

Description

technical field [0001] The invention relates to the field of battery manufacturing, in particular to a connection structure between a battery tab and a cover plate. 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 Applications(China)
IPC IPC(8): H01M2/06H01M2/22H01M2/26H01M50/179
CPCY02E60/12Y02E60/10
Inventor 刘道坦刘照宽黄荣光郭春泰
Owner SHENZHEN BAK BATTERY CO LTD
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