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Battery protector and battery with same

A battery protection device and battery technology, applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve problems such as unstable safety performance, overheating, and battery energy cannot be completely released, so as to avoid thermal runaway, low cost, The effect of simple structure

Active Publication Date: 2009-10-28
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of overheating and unstable safety performance of the existing batteries due to overcharging, placing in a high temperature environment, internal short circuit, extrusion and other abnormal conditions, the present invention further eliminates the fact that the battery energy cannot be completely released due to overheating and continues to use these batteries. To solve the potential safety hazards caused by problem batteries, a battery protection device and a battery including the battery protection device are provided to completely release the energy of the battery under controllable conditions. At the same time, the problem battery will permanently fail when the first problem occurs. Thereby eliminating potential safety hazards, improving the safety performance of the battery, and greatly reducing the occurrence of battery safety accidents

Method used

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  • Battery protector and battery with same
  • Battery protector and battery with same
  • Battery protector and battery with same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment is used to illustrate the battery protection device and the battery including the battery protection device according to the present invention.

[0054] (1) Preparation of battery protection device

[0055] Select a low-melting point alloy composed of 20% tin, 30% lead, 40% bismuth and 10% indium, cut two alloy blocks of 2.3mm×2mm×0.7mm, weld a nickel strip at one end of the alloy block, and weld the two alloy blocks The blocks are placed in a straight line with a distance of 0.3mm. The two alloy blocks are covered with an insulating resin outer layer around the two alloy blocks by low-temperature injection molding to make a battery protection device with a length x width x height of 5mm x 2.5mm x 1mm (excluding the lead-out nickel strip ), the melting point of the battery protection device made is 85°C, and the resistance after conduction is 1.5 ohms.

[0056] (2) Production of batteries

[0057] Wind the positive and negative electrodes and the corre...

Embodiment 2

[0060] This embodiment is used to illustrate the battery protection device and the battery including the battery protection device according to the present invention.

[0061] The same method as in Example 1 is used to make a battery protection device and a battery including the battery protection device, except that the alloy material in the battery protection device is selected from 30% lead, 25% bismuth, 20% aluminum, and 25% indium The protection device made has a melting point of 91°C and a resistance of 1 ohm.

Embodiment 3

[0063] This embodiment is used to illustrate the battery protection device and the battery including the battery protection device according to the present invention.

[0064] The battery protection device and the battery including the battery protection device are made by the same method as in Example 1, the difference is that the proportion of alloy materials in the battery protection device is 10% tin, 50% lead, 20% bismuth, 20% indium , the melting point of the prepared protective device is 75° C., and the resistance is 2 ohms.

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Abstract

The invention provides a battery protector and a battery with the same, wherein the battery protector comprises an insulator, two conductive terminals and alloy blocks, wherein at least one alloy block is arranged in the insulator and between the conductive terminals; and the conductive terminals are led out from the insulator. In a low-temperature state, the relationship between the alloy blocks or the alloy blocks and the conductive terminators enables the two conductive terminals to be in a cut-off state; and in a high-temperature state, the alloy block is melted to enable the two conductive terminals to be in a conductive state. The invention also provides a battery with the battery protector. The two conductive terminals of the battery protector are respectively connected with the anode and the cathode of the battery and welded between a rivet and an upper lid of the battery. The battery protector and the battery with the battery protector can thoroughly release the energy of the battery because of the melting conduction of the alloy blocks under the high-temperature condition, and the battery with the problem is permanently invalid after the problem happens for the first time, thus, the safety danger is eliminated, the safety performance of the battery is improved, and the safety accidents of the battery are greatly reduced.

Description

technical field [0001] The invention relates to a battery protection device and a battery including the battery protection device. Background technique [0002] At present, lithium-ion batteries are more and more widely used in portable electronic products such as mobile phones and digital cameras due to their small size, high energy, and no pollution. With the wide application of lithium-ion batteries, their safety performance has been paid more and more attention. [0003] During storage and transportation, lithium-ion batteries will be overheated due to external short-circuit and other accidents under the impact of high current, resulting in battery explosion; when the battery is charged and discharged, it may be impacted by high current, which may also cause the battery to explode. , At the same time, the safety performance and reliability of the battery will be greatly reduced under the condition of overcharge and overdischarge. [0004] In order to solve the above pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/34H01M10/40H01M50/572
CPCY02E60/122Y02E60/10
Inventor 王涌司雷雷磊
Owner BYD CO LTD