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A kind of lithium ion battery and battery pack

A lithium-ion battery and battery pole technology, which is applied in the manufacture of battery pack components, secondary batteries, and electrolyte storage batteries, can solve the problem of insignificant effects of external short-circuit devices, and can improve the effect of external short-circuits, improve short-circuit effects, and prevent explosion effect

Active Publication Date: 2022-01-07
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem that the effect of the existing external short-circuit device is not obvious, the present invention provides a lithium-ion battery and battery pack that can better realize the external short-circuit effect

Method used

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  • A kind of lithium ion battery and battery pack
  • A kind of lithium ion battery and battery pack
  • A kind of lithium ion battery and battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0043] Embodiment 1, as attached figure 1 As shown, the battery pole core 5 adopts a stacked pole core, the outermost pole piece of the stacked pole core is the first pole piece (positive pole piece 31), the first conductive piece (aluminum piece 11) and the positive pole piece on the positive pole piece 31 The positive tab 21 is electrically connected; the second conductive piece (copper piece 12 ) is electrically connected to the negative tab 22 on the second pole piece (negative pole piece 32 ).

Embodiment approach 2

[0044] Embodiment 2, as attached figure 2 As shown, the battery pole core 5 adopts a stacked pole core, the outermost pole piece of the stacked pole core is the second pole piece (positive pole piece 31), the second conductive piece (copper piece 12) and the positive pole piece 31 The positive tab 21 is electrically connected; the first conductive piece (aluminum piece 11 ) is electrically connected to the negative tab 22 on the first pole piece (negative pole piece 32 ).

Embodiment approach 3

[0045] Implementation mode three, as attached image 3 As shown, the battery pole core 5 adopts a stacked pole core, the outermost pole piece of the stacked pole core is the first pole piece (negative pole piece 32), the first conductive piece (aluminum piece 11) and the negative pole piece on the negative pole piece 32 The negative pole tab 22 is electrically connected; the second conductive sheet (copper sheet 12 ) is electrically connected to the positive pole tab 21 on the second pole piece (positive pole piece 31 ).

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Abstract

The present invention relates to the field of lithium-ion batteries, in particular to a lithium-ion battery and a battery pack. The lithium-ion battery includes a housing, a battery pole core located in the housing and an external short circuit device. The battery pole core includes a first pole piece, The second pole piece and the diaphragm between the first pole piece and the second pole piece, the first pole piece electrically connected to the first pole piece, and the second pole piece electrically connected to the second pole piece, the outer The short circuit device includes a first conductive sheet / diaphragm / second conductive sheet arranged in sequence; the first conductive sheet is electrically connected to the first tab; the second conductive sheet is electrically connected to the second tab; the first Holes are provided on the conductive sheet and / or the second conductive sheet to improve the external short circuit effect and improve the safety performance of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery and a battery pack. Background technique [0002] The existing lithium-ion battery may cause an internal short circuit due to the penetration of foreign matter during use, that is, the foreign matter penetrates the separator, and the positive and negative electrodes form a channel, so that electrons can pass through, forming an internal short circuit. There is an external short-circuit device added to the battery, for example, a group of conductive sheets are connected in parallel on the battery core, and the conductive sheets are separated by a diaphragm. An external short circuit occurs in the battery to release the energy of the battery, thereby keeping the battery in a safe state, but the effect of the existing external short circuit device is not obvious, and the internal short circuit state still occurs from time to time. Contents of the inventio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M50/584H01M10/0525H01M50/572
CPCY02E60/10Y02P70/50
Inventor 陈永坤和林林潘仪
Owner BYD CO LTD
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