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Method for evaluating maximum safe liquid injection amount of lithium ion battery

A lithium-ion battery and evaluation method technology, applied in the field of evaluation of the maximum safe liquid injection volume of lithium-ion batteries, to achieve the effects of strong flexibility, simple and fast operation, and accurate results

Active Publication Date: 2019-11-22
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no effective evaluation method for the maximum safe liquid injection volume of lithium-ion batteries

Method used

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  • Method for evaluating maximum safe liquid injection amount of lithium ion battery
  • Method for evaluating maximum safe liquid injection amount of lithium ion battery
  • Method for evaluating maximum safe liquid injection amount of lithium ion battery

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Embodiment Construction

[0029] In order to facilitate understanding of the present invention, the present invention will be described more fully below in conjunction with specific embodiments. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terminology used herein in the description of the present invention is only for the purpose of describing specific embodiments, and is not intended to limit the present invention.

[0031] A method for evaluating the maximum safe liquid injection volume of a lithium-ion battery, comprising the following steps:

[0032] S1. The measured liquid injecti...

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Abstract

The invention discloses a method for evaluating the maximum safe liquid injection amount of a lithium ion battery. The method comprises the following steps of: firstly, measuring the internal empty power residual volume V standard of a lithium ion battery designed with a liquid injection amount m standard in a state of constraining to the designed thickness h standard, the added value [delta]V expansion of the volume of a pole piece of the battery from empty power to full power plate and the internal volume change [eta] of the battery caused by the unit thickness change of the battery to obtain the internal empty power residual volume V0 of the battery with the liquid injection amount being the maximum safe liquid injection amount m (unknown number) in an unconstrained free state (the thickness h self is generally greater than the designed thickness h standard) and the internal full power residual volume Vm of the battery in a state of constraining to the module reserved thickness h module, thereby obtaining the maximum safe liquid injection amount m. According to the evaluation method disclosed by the invention, the upper limit air pressure inside the battery when the battery is used in the module is considered as a basis for calculating the maximum safe liquid injection amount of the lithium ion battery, so that the evaluation method has relatively high practicability and flexibility, a complex liquid injection amount gradient experiment is omitted, and the operation is simple and rapid.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a method for evaluating the maximum safe liquid injection volume of lithium-ion batteries. Background technique [0002] The liquid injection volume of lithium-ion batteries is a key parameter in battery design, which not only affects the electrical performance parameters of the battery, but is also closely related to the safety performance of the battery. [0003] Excessive liquid injection will reduce the remaining space inside the battery and increase the internal air pressure. The battery overcharge safety device (OSD, Overcharge Safety Device) and the explosion-proof valve may reverse the risk of opening the valve, which will cause the battery to leak and fail. Therefore, it is found that It is extremely important to have a method for determining the maximum safe liquid filling volume for Li-ion batteries. In addition, the safety assessment should be combine...

Claims

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Application Information

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IPC IPC(8): G01G17/04
CPCG01G17/04
Inventor 张少杰许邦南
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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