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secondary battery

A secondary battery and electrode assembly technology, applied in secondary battery manufacturing, battery pack parts, battery cover/end cover, etc., can solve the problem of difficult gas discharge in time, easy deformation of the top cover plate, low deformation resistance, etc. problems, to achieve the effect of increasing space utilization, preventing lithium precipitation, and improving strength

Active Publication Date: 2021-08-24
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to increase the energy density of the secondary battery, the prior art usually chooses to increase the width of the electrode assembly; however, after increasing the width of the electrode assembly, it is difficult to discharge the gas generated by the reaction of the electrode assembly in time, resulting in the accumulation of gas on the positive and negative plates Between, triggering the risk of lithium analysis
In addition, the top cover plate in the prior art is generally flat and has low deformation resistance. When the internal pressure of the secondary battery increases to a certain extent, the top cover plate is prone to deformation

Method used

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Embodiment Construction

[0042] refer to figure 1 with figure 2 , the secondary battery includes an electrode assembly 1 , a casing 2 and a top cover assembly 3 .

[0043] The housing 2 may have a hexahedral shape or other shapes. A housing cavity is formed inside the casing 2 to accommodate the electrode assembly 1 and the electrolyte. The housing 2 has an opening formed at one end, and the electrode assembly 1 can be placed into the housing cavity of the housing 2 through the opening. The casing 2 can be made of conductive metal materials such as aluminum or aluminum alloy, and can also be made of insulating materials such as plastic.

[0044] The top cover assembly 3 includes a top cover plate 31 , a first electrode terminal 32 and a second electrode terminal 33 . The top cover plate 31 is fixed on the casing 2 and covers the opening of the casing 2 .

[0045] The electrode assembly 1 comprises a first pole piece 14, a second pole piece 15 and a diaphragm 16 arranged between the first pole pie...

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Abstract

The invention provides a secondary battery, which includes an electrode assembly, a casing and a top cover assembly. The casing has an opening and accommodates the electrode assembly; the top cover assembly includes a top cover plate, a first electrode terminal and a second electrode terminal, and the top cover plate is fixed on the casing and covers the opening of the casing. The electrode assembly includes a main body, a first tab, and a second tab. The first tab and the second tab are respectively located on both sides of the main body along the lateral direction, and the first tab is electrically connected to the first electrode terminal, and the second tab is electrically connected to the first electrode terminal. The ear is electrically connected to the second electrode terminal. The top cover plate has a protrusion, the protrusion protrudes toward the side away from the electrode assembly, and the protrusion forms a recess on the side close to the electrode assembly. The main body is provided with a first groove and a second groove at one end close to the top cover plate, the first groove and the second groove are arranged along the transverse direction, and the main body is located between the first groove and the second groove Part of it extends into the recess.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a secondary battery. Background technique [0002] A secondary battery generally includes an electrode assembly, a casing for accommodating the electrode assembly, and a top cover fixed to the casing, and the electrode assembly is formed by winding a positive pole piece, a negative pole piece, and a separator. In order to increase the energy density of the secondary battery, the prior art usually chooses to increase the width of the electrode assembly; however, after increasing the width of the electrode assembly, it is difficult to discharge the gas generated by the reaction of the electrode assembly in time, resulting in the accumulation of gas on the positive and negative plates Between, triggering the risk of lithium analysis. In addition, the top cover plate in the prior art is generally flat and has low deformation resistance. When the internal pressure of the secondary battery in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/147H01M10/04
CPCH01M10/04H01M50/148Y02E60/10Y02P70/50
Inventor 许虎任苗苗来佑磊金海族朱凌波
Owner CONTEMPORARY AMPEREX TECH CO
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