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Nested structure lithium ion battery capable of reducing risk of thermal runaway

A lithium-ion battery, nested structure technology, applied in the field of lithium-ion batteries, can solve the problems of uneven battery temperature, complex thermal management, difficult heat dissipation or heating, etc., to offset external mechanical damage, high heating efficiency, and safe protection Effect

Active Publication Date: 2021-02-19
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a nested structure lithium-ion battery that reduces the risk of thermal runaway, and solve the technical problems of lithium-ion batteries in the prior art because of complex thermal management, uneven internal temperature of the battery, and difficulty in heat dissipation or heating

Method used

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  • Nested structure lithium ion battery capable of reducing risk of thermal runaway
  • Nested structure lithium ion battery capable of reducing risk of thermal runaway
  • Nested structure lithium ion battery capable of reducing risk of thermal runaway

Examples

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Embodiment 1

[0039] Such as figure 1 , 2 As shown, a nested structure lithium-ion battery that reduces the risk of thermal runaway includes a metal case 1 and a cell 2 filled in the case;

[0040]The housing 1 includes an inner cylinder 101 and an outer cylinder 102, both of which are cylindrical structures with a bottom and no cover, wherein the outer cylinder 102 includes an outer wall 1022 and a secondary outer wall 1021, the end surface of the outer cylinder 102 is annular, and the inner cylinder 101 is located in the through hole in the center of the outer cylinder 102. There is a gap 3 between the side wall of the inner cylinder 101 and the secondary outer wall 1021 of the outer cylinder. A metal connecting rib 4 is arranged in the gap 3, and the inner cylinder 101 is connected by the connecting rib 4. It is fixedly connected with the outer cylinder 102 and conducts.

[0041] The cell 2 includes an outer cell 202 and an inner cell 201, the outer cell 202 is filled in the annular ca...

Embodiment 2

[0062] In this example, if Figure 4 , 5 As shown, the gap 3 between the side wall of the inner cylinder and the secondary outer wall of the outer cylinder is filled with a heat conducting material 9 . The purpose of filling the heat-conducting material 9 is to enable the heat conduction between the cells in the outer cell box. This kind of battery is not suitable for assembly in a battery pack that often works in a high temperature environment, but is very suitable for assembly in a battery pack that often works in a low temperature environment. environment in the battery pack.

[0063] In a low-temperature environment, the temperature of the battery is too low when it is used, which will easily lead to a significant decline in battery performance, and it will easily shorten the battery life and reduce the stability and safety of the battery in the long run. Therefore, in a low-temperature environment, the use strategy of this nested battery Different from ordinary lithium-...

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Abstract

The invention discloses a nested structure lithium ion battery capable of reducing a risk of thermal runaway. The nested structure lithium ion battery comprises a metal shell and a battery cell filling the shell, the shell comprises an inner cylinder and an outer cylinder, the inner cylinder is located in a through hole in the center of the outer cylinder, and a gap exists between the side wall ofthe inner cylinder and the secondary outer wall of the outer cylinder. The battery cell comprises an outer battery cell and an inner battery cell, the cavity of the outer cylinder is filled with theouter battery cell, and the cavity of the inner cylinder is filled with the inner battery cell. According to the invention, the battery core is divided into two parts, so that the outer battery core or the inner battery core can work intermittently when in use, or the other battery core is started after one battery core is used up. The gaps are used as heat dissipation channels in a high-temperature environment, so that heat can be quickly dissipated, and accidents caused by overheating are prevented; when the battery is used in a low-temperature environment, the inner battery core is enabledto work firstly, the outer battery core is heated by heat generated by the inner battery core during working, and the battery core or the inner battery core is enabled to work simultaneously after thetotal temperature rises to a normal working state, so that the temperature of the battery can be adjusted in various modes.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a lithium-ion battery with a nested structure that reduces the risk of thermal runaway. Background technique [0002] Due to its own properties, lithium-ion batteries are prone to heat accumulation during charging, discharging and use. These heat will cause the temperature of the battery to rise during operation, which will reduce the working performance and safety of the battery, especially when the lithium-ion battery is used for electric When the power source of the car, due to the dense stacking of batteries and the difficulty of heat conduction, it is more likely to cause the temperature inside the battery pack to continue to rise and the temperature to be uneven. The continuous rise in temperature will lead to a decrease in the stability of the battery, which in turn will cause the battery to experience thermal runaway. lead to a series of security...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/058H01M10/0587H01M10/613H01M10/615H01M10/617H01M10/625H01M10/653
CPCH01M10/0525H01M10/058H01M10/0587H01M10/613H01M10/615H01M10/617H01M10/625H01M10/653H01M2220/20Y02E60/10Y02P70/50H01M50/107H01M50/152H01M10/637H01M10/643H01M50/119H01M10/0445H01M50/545H01M10/0422
Inventor 王志荣白金龙
Owner NANJING TECH UNIV
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