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secondary battery

A secondary battery and electrode assembly technology, which is applied in secondary battery manufacturing, battery components, circuits, etc., can solve the problems of capacity attenuation, reducing the service life of secondary batteries, and lithium analysis, so as to improve wettability and prolong battery life. The effect of improving the service life and liquid retention capacity

Active Publication Date: 2021-11-02
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the electrolyte to infiltrate the electrode assembly from the bottom. After the secondary battery has been used for a long time, the electrolyte inside the electrode assembly is lacking, which is prone to lithium precipitation, resulting in capacity attenuation and reducing the service life of the secondary battery.

Method used

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Embodiment Construction

[0041] refer to figure 1 with figure 2 , the secondary battery includes an electrode assembly 1 , a casing 2 and a top cover assembly 3 .

[0042] 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.

[0043] 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 .

[0044] 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. 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 main body is provided with a first groove at an end away from the top cover. The secondary battery further includes a liquid absorbing member capable of absorbing the electrolyte, the liquid absorbing member is disposed between the main body and the case, and the liquid absorbing member is at least partially located in the first groove and contacts the main body. The secondary battery of the present application can improve the wettability of the electrolyte, avoid lithium precipitation, and prolong the service life of the secondary battery.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a secondary battery. Background technique [0002] Secondary batteries usually include an electrode assembly and a casing for housing the electrode assembly. In a traditional wound electrode assembly, the positive and negative tabs usually protrude from the top of the electrode assembly, and the electrolyte in the casing can infiltrate the electrode assembly from the bottom. To prolong the service life of the secondary battery. In order to increase the energy density of the secondary battery, the prior art usually chooses to increase the width of the electrode assembly of the secondary battery, and at the same time make the positive and negative tabs protrude from both sides of the electrode assembly along the lateral direction, so as to fully utilize the interior space. However, it is difficult for the electrolyte to infiltrate the electrode assembly from the bottom. After the seconda...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/673H01M10/04
CPCH01M10/0431H01M50/70Y02E60/10Y02P70/50
Inventor 许虎陈元宝来佑磊金海族朱凌波
Owner CONTEMPORARY AMPEREX TECH CO