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Method for detecting false solder of battery pack

A battery pack and virtual welding technology, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., can solve problems such as difficult to find and unreliable connection of power battery packs

Active Publication Date: 2013-01-02
BYD CO LTD
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is a problem that is difficult to find in the prior art when the power battery pack is unreliably connected during use, such as virtual welding, and especially provides an easy-to-implement method for detecting the virtual welding of the battery pack

Method used

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  • Method for detecting false solder of battery pack

Examples

Experimental program
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Embodiment

[0022] Detect the virtual solder joints of a battery pack. The capacity of the battery pack is 50A, and 10 single cells are formed in series by welding electrode terminals. The positive electrode material system of the single battery adopts lithium iron phosphate material, and the charging protection voltage is 3.8V.

[0023] First, use the attached figure 1 The potential detection points are set as shown, where n is 10. Then charge the battery pack at 2C, wherein the charging current is 100A, the duration is 0s-1.2s, and the interval is 0.1s, and the voltage of each single battery is detected, and the voltage of the single battery is recorded as U 1 -U 10 . After charging, the voltage of each single battery returns to normal. The test results are shown in Table 1, and the test curves are attached figure 2 .

[0024] Table 1 Test results

[0025] time(s) u 1 (V) u 2 (V) u 3 (V) u 4 (V) u 5 (V) u 6 (V) u 7 (V) u 8 (V) u 9 (V) u 1...

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Abstract

The invention discloses a method for detecting the false solder of a battery pack formed by connecting n single batteries in series through electrode terminals. The method comprises the following steps of: charging the battery pack with current not smaller than 2C multiplying power and detecting the voltage Ui of each single battery; and judging that the ith single battery has false solder when the voltage Ui of the ith single battery is larger than a preset value, wherein i and n are both natural numbers, and i is the number of the single battery. The test method provided by the invention can very rapidly, simply, conveniently and accurately detect connecting false solder joints in the battery pack, find the false solder position in time, maintain the battery pack, not only ensure the normal use of the battery pack, but also ensure the safe application of the battery pack to an electric vehicle.

Description

【Technical field】 [0001] The invention relates to a power battery pack, in particular to a detection method for a virtual welding connection in the power battery pack. 【Background technique】 [0002] Rechargeable lithium batteries have a wide range of applications, such as laptop batteries, mobile phone batteries, power tools, network equipment and other personal electronic devices. The power source required by these devices is a lightweight battery with medium or smaller power output requirements. However, on other devices, rechargeable lithium batteries can also provide higher power than the above-mentioned devices require, such as high-output lithium batteries can be used as industrial power supply equipment, high-power communication facilities, electric vehicles, etc. In the field of electric vehicles, the maturation of high-output lithium-ion battery systems is an obvious driver. [0003] To achieve high output of lithium batteries, multiple single cells need to be co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02G01R19/165
Inventor 吴光麟刘进张浩
Owner BYD CO LTD
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