Busbar capable of preventing thermal runaway diffusion and storage battery pack

A battery pack and busbar technology, which is applied to battery pack components, secondary batteries, secondary battery repair/maintenance, etc., can solve the problem of high connection resistance of single batteries, affecting power battery performance, and battery pack rate performance decline, etc. problem, to avoid the effect of spreading

Inactive Publication Date: 2019-06-07
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Causes thermal runaway to spread within the battery pack
[0003] A current limiting structure is designed in the busbar. Fuse occurs when the current is too high or the temperature is too high. decline, affecting the performance of the power battery

Method used

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  • Busbar capable of preventing thermal runaway diffusion and storage battery pack
  • Busbar capable of preventing thermal runaway diffusion and storage battery pack
  • Busbar capable of preventing thermal runaway diffusion and storage battery pack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 20 18650 batteries are connected in parallel to form a battery pack. The metal Al is used as the bus bar. The 18650 battery and the bus bar are connected through the Al sheet, and a cavity is left between the Al sheet and the bus bar (such as figure 1 shown), fill the cavity between the Al sheet and the bus bar with ammonium nitrate.

[0036] After thermal runaway occurred in one 18650 battery in the battery pack, the high temperature spread rapidly from the upper cover of the battery along the Al sheet, and the temperature of the Al sheet increased causing ammonium nitrate to explode, cutting off the connection between the Al sheet and the bus bar to prevent thermal runaway Diffusion along the busbar.

Embodiment 2

[0038] 20 18650 batteries are connected in parallel to form a battery pack, and the metal Al is used as a bus bar. The 18650 battery and the bus bar are connected through an Al sheet, and a cavity is left between the Al sheet and the bus bar. NaN 3 After being mixed with a binder, it is pressed on the surface of the heating wire 4, and then put into the cavity between the Al sheet and the bus bar, and the two ends of the heating wire are connected to the BMS system.

[0039] The BMS monitors the operating status of the battery pack. When it is found that a 18650 battery has an internal short circuit or is about to experience thermal runaway, the BMS system will power up the heating wire to trigger NaN 3 Decomposition occurs, and the Al sheet is cut off from the busbar to prevent thermal runaway from spreading along the busbar.

Embodiment 3

[0041] 20 18650 batteries are connected in parallel to form a battery pack, with metal Cu as the bus bar, the 18650 battery is connected to the bus bar through the Ni strip, and there are pits in the bus bar for filling the mixture of ammonium nitrate and sucrose, and then the Ni sheet is welded above the busbar cavity.

[0042] After a thermal runaway occurred in a 18650 battery, the high temperature spread along the Ni sheet, triggering the explosion of the mixture of ammonium nitrate and sucrose, cutting off the connection between the 18650 battery and the bus bar to prevent the spread of thermal runaway.

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PUM

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Abstract

The invention discloses a busbar capable of preventing thermal runaway diffusion and a storage battery pack, and belongs to the technical field of storage battery packs. The busbar is applied to the safety protection of the storage battery pack and characterized in that the busbar includes conducting strips connected to each storage battery and bus bars connected to each conducting strip; and thermal explosives are arranged between the conducting strips and the bus bars. Through the adoption of the above technical schemes, the connection with the busbar can be rapidly cut off by increasing temperature, voltage or pressure in the busbar to trigger a disconnection structure after thermal runaway of some singe cell occurs, high temperature can be prevented from diffusing along the busbar, andthermal runaway can be prevented from spreading in the battery pack.

Description

technical field [0001] The invention belongs to the technical field of battery packs, and in particular relates to a bus bar and a battery pack for preventing thermal runaway from spreading. Background technique [0002] Lithium-ion batteries have achieved great success in the field of power batteries by virtue of their advantages such as high energy density and long cycle life. In order to meet the energy and power requirements of new energy vehicles, lithium-ion batteries need to be connected in series and in parallel to form a battery pack. A power battery pack is often composed of hundreds or even thousands of single cells. Once one of the batteries suffers from thermal runaway, the high temperature will spread between the single cells along the busbar, causing thermal runaway of surrounding batteries. . Causes the spread of thermal runaway within the battery pack. [0003] A current limiting structure is designed in the busbar. Fuse occurs when the current is too high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/34H01M2/20H01M10/0525H01M10/42
CPCY02E60/10
Inventor 郑见杰王炜娜杜园赵珊珊
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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