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Evaluation method and evaluation apparatus for evaluating battery safety and battery

An evaluation method and evaluation device technology that can be applied to battery electrodes, secondary battery charging/discharging, batteries, etc., and can solve problems such as incomprehensible levels of safety, short circuits, etc.

Inactive Publication Date: 2008-10-01
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, what actually poses a problem to the safety of the battery is an internal short circuit that occurs in a seemingly indistinguishable state, and such internal short circuits often occur through chemical processes in them.
For example, tiny conductive foreign matter is mixed into the battery, and it is dissolved and precipitated by the electrolyte, resulting in an internal short circuit. The heat generation behavior at this time cannot be studied by the above test method.
[0007] In addition, these tests cannot understand the level of safety when an internal short circuit occurs through the above-mentioned chemical process, such as the level of safety called "no heat generation at all" or "some heat generation"

Method used

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  • Evaluation method and evaluation apparatus for evaluating battery safety and battery
  • Evaluation method and evaluation apparatus for evaluating battery safety and battery
  • Evaluation method and evaluation apparatus for evaluating battery safety and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Hereinafter, the evaluation method of this invention is demonstrated concretely based on an Example.

[0084] (1) Production of positive plate

[0085] As the positive electrode active material, nickel / manganese / cobalt / lithium oxide (LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 O 2 ) powder. As a binder, an N-methyl-2-pyrrolidone (NMP) solution containing 12% by weight of polyvinylidene fluoride (PVDF) (#1320 manufactured by Kureha Chemical Industry Co., Ltd.) was used. As the conductive agent, acetylene black was used, and as the dispersion medium, NMP was used.

[0086] 3 kg of the above-mentioned positive electrode active material, 1 kg of the above-mentioned binder, 90 g of the above-mentioned conductive agent, and an appropriate amount of the above-mentioned dispersion medium were stirred in a double-arm mixer to prepare a positive electrode mixture slurry. This positive electrode mixture slurry was applied to both surfaces of a strip-shaped positive electrode current collector ma...

Embodiment 2

[0110] A battery (K1) was produced in the same manner as in Example 1. The safety of this battery was evaluated in the same manner as in Example 1, except that a copper wire having a diameter of 100 μm and a length of 5 mm was used as the conductive foreign matter (the dissolution initiation voltage was 3.6 V). The results are shown in Table 1 below.

Embodiment 3

[0112]A battery (K1) was produced in the same manner as in Example 1. The safety of the battery was evaluated in the same manner as in Example 1, except that a copper wire having a diameter of 50 μm and a length of 5 mm was used as the conductive foreign matter (the dissolution initiation voltage was 3.6 V). The results are shown in Table 1 below.

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Abstract

This invention refers to an evaluation method for evaluating safety of a battery and a battery. This invention provides a battery evaluation method and an evaluation device in order to find out the safety level when the internal is short-circuited caused by that the foreign matter enters into the battery and it is processed the chemical reaction, additionally, this invention further provides a battery and battery pack assigning the safety level through the evaluation method and evaluation device. The evaluation method is: immersing the battery charged to the ruled voltage and mixed with conductive foreign matter under the condition of contacting with the positive electrode plate but not contacting with the negative electrode plate into an electrolyte (2). The start period when the conductive foreign matter mixed in the battery begins to dissolve in said electrolyte is assigned according to the measured value of test electrode potentiometer (4). The short circuit in the battery can be detected out based on the measuring value of the battery voltmeter (6). The need time of occurring the short circuit can be computed out from the period when the dissolving is began and the period when the internal is short-circuited.

Description

technical field [0001] The present invention relates to a battery safety evaluation method and an evaluation device, and a battery for which safety indicators are obtained by the evaluation method and the evaluation device, and particularly relates to an evaluation method and an evaluation method for evaluating the safety of a battery when an internal short circuit occurs. An evaluation device, and a battery for which an index on safety was obtained by the evaluation method and the evaluation device. Background technique [0002] One of the evaluation items when evaluating the safety of batteries such as lithium ion secondary batteries and alkaline dry batteries is heat generation behavior when an internal short circuit occurs. The content of the test method for examining this behavior is determined by, for example, the UL standard for lithium batteries (UL1642) and the guidelines from the Battery Industry Association (SBA G1101-1997 Standard Guidelines for Safety Evaluation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M6/50H01M10/48H01M10/04H01M2/34G01R31/36H01M10/05H01M10/0566H01M10/0585H01M10/0587
CPCH01M2/34H01M4/131H01M10/0525H01M2200/00H01M4/133H01M10/44H01M10/486Y02E60/10Y02P70/50G01R31/36
Inventor 笠松真治西野肇藤川万乡岛田干也
Owner PANASONIC CORP
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