Capsule and battery containing the same

A capsule and battery technology, applied in secondary batteries, battery pack components, circuits, etc., can solve problems such as poor thermal safety of batteries, and achieve the effect of sensitive pressure relief and avoiding unexpected situations.

Inactive Publication Date: 2009-07-01
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the defect of poor thermal safety of the battery provided by the prior art, and provide a capsule with high thermal safety for the battery and a battery including the capsule

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0021] The capsules of the present invention can be prepared according to the conventional method for preparing capsules, such as mixing the main components forming the shell with the material wrapped in the shell, and then stirring and mixing evenly at 60-90 ° C and a pressure of 2-4 MPa , and then add the auxiliary ingredients that form the shell, continue to stir and mix evenly, and finally cool down at 25-50 ° C under a pressure of 2-4 MPa to form a capsule. Wherein, the weight ratio of the substance forming the shell to the substance wrapped in the shell is 1:4-4:1, preferably 1:3-3:1. The average particle diameter of the formed capsule particles may be 150-500 microns, preferably 150-300 microns. The shell of the formed capsule particles may have a wall thickness of 3-100 microns, preferably 5-50 microns. The material forming the shell can be one or more of epoxy resin, gelatin and gum arabic; the material wrapped in the shell is preferably methylene bromide. The auxil...

Embodiment 1

[0029] This implementation is used to illustrate the capsule provided by the invention and its preparation method.

[0030] Mix bisphenol A type epoxy resin E-51 (epoxy equivalent 190, Shanghai Resin Factory) and methylene bromide, stir and mix evenly at 60°C under a pressure of 2 MPa, then add Span 80 (Tengfei, Guangzhou) Trading Co., Ltd.) and Menthanediamine, continue to stir and mix evenly, and finally cool down at 30 °C under 2 MPa to form capsules. Among them, the weight ratio of the total weight of the substances forming the capsule shell to methylene bromide is 1:4, Span 80 accounts for 1% by weight of the bisphenol A type epoxy resin E-51, and menthane diamine accounts for 1% by weight of the bisphenol A type epoxy resin E-51. 8% by weight of epoxy resin E-51 by weight. The capsule particles had an average particle diameter of 200 microns and a shell thickness of 5 microns. The capsule wall breaking temperature (the capsule wall breaking temperature herein is the te...

Embodiment 2

[0032] This implementation is used to illustrate the capsule provided by the invention and its preparation method.

[0033] Mix gelatin (Cangzhou Dongfang Beeswax Co., Ltd.) and methylene bromide, stir and mix evenly at 70°C under a pressure of 3 MPa, then add Span 80 (Guangzhou Tengfei Trading Co., Ltd.) and glutaraldehyde, continue Stir to mix evenly, and finally cool at 35°C under 3 MPa to form capsules. Wherein, the weight ratio of the total weight of the substances forming the capsule shell to methylene bromide is 2:3, Span 80 accounts for 1% by weight of the gelatin, and glutaraldehyde accounts for 8% by weight of the gelatin. The capsules are 500 microns in diameter and have a shell thickness of 100 microns. The capsule wall breaking temperature is 125°C.

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Abstract

The invention provides a capsule, which comprises a shell and a material in the shell, wherein the shell is made of a incombustible material with a melting point of 100 to 130 DEG C and capable of stably existing in the a battery electrolyte; and the gasification temperature of the material in the shell is lower than the melting point of the shell, and can generate a fire retardant gas when being gasified. The invention also provides a battery, which comprises an electrode core, an electrolyte and a battery shell, which the electrode core and the electrolyte are arranged in the battery shell; the electrode core includes a positive electrode, a negative electrode and a diaphragm between the positive electrode and the negative electrode; the positive electrode contains a positive current collector and a negative active material attached on the positive current collector; and the negative electrode includes a negative current collector and a negative active material attached on the negative current collector. The battery also includes the capsule provided in the invention, wherein the capsule is arranged in the battery shell. An anti-explosion hole of the battery having the capsule can be opened to respond to the melting temperature of the capsule shell material to achieve more sensitive battery discharge response.

Description

technical field [0001] The present invention relates to a capsule and a battery comprising the capsule. Background technique [0002] Lithium-ion batteries have the advantages of small size, high energy, and no pollution, and have been more and more widely used in portable electronic products such as mobile phones and digital cameras. [0003] With the wide application of lithium-ion batteries, the safety performance of lithium-ion batteries has been paid more and more attention. The possible safety problems of lithium-ion batteries are: due to improper use or other reasons, the battery is overcharged; or in an extremely harsh environment, such as unexpected high temperature, impact, etc., resulting in a local micro-short circuit inside the battery; abnormal temperature rise, The materials inside the battery react chemically, usually thermally, causing a further increase in temperature. At high temperatures, usually above 120°C (the temperature of the outer wall of the bat...

Claims

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Application Information

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IPC IPC(8): H01M2/34H01M2/12H01M2/00H01M10/40H01M50/581
CPCY02E60/12Y02E60/10
Inventor 何爱勤高秀玲王晓普
Owner BYD CO LTD
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