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Judgment method for connecting state of battery pack

A connection status, battery pack technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problem of not being able to judge the aging of the contact impedance line, and achieve the effect of high accuracy, safe use and high reliability

Active Publication Date: 2014-08-13
广州市锰光锂电池科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method can only judge whether there is a short circuit or an open circuit between the battery connections, and cannot judge the increase in contact impedance or the aging of the line.

Method used

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  • Judgment method for connecting state of battery pack

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Experimental program
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Effect test

Embodiment 1

[0027] A method for judging the connection state of a battery pack, comprising the following steps:

[0028] Step 1: Obtain the serial number of all series-connected single cells in the battery pack to be tested, and the parallel connection number of all parallel-connected single cells; generally, battery packs are connected in parallel first and then in series, such as 2 in parallel and 4 in series, referring to 2 monomers are connected in parallel to form a module, and then 4 such modules are connected in series, a total of 8 monomers;

[0029] Step 2: Apply a pulse sequence to the battery pack to be tested according to the preset current and preset time, and measure and record the total voltage at both ends of the battery pack to be tested and any of the battery packs to be tested at the start time and end time of the pulse sequence, respectively. The voltage at both ends of a single battery, any single battery only needs to measure the voltage at both ends of a single batt...

Embodiment 2

[0052] If the preset threshold is set to 2, the battery pack is composed of 88 single cells connected in parallel in 2 parallels, and the DC internal resistance of the battery pack is 31 milliohms. 2*31 / (88*0.4)=1.76. At this time, the judgment coefficient is less than the preset threshold value 2, indicating that the battery pack is connected normally and can continue to be used safely.

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Abstract

The invention relates to a judgment method for the connecting state of a battery pack. The judgment method includes the following steps that the series connection number of all battery cells connected in series in the battery pack to be detected and the parallel connection number of all battery cells connected in parallel in the battery pack to be detected are respectively obtained; a pulse sequence is exerted on the battery pack to be detected according to a preset current and preset time, and at the starting time and the finishing time of the pulse sequence, the total voltage across the two ends of the battery pack to be detected and the voltage across the two ends of any battery cell in the battery pack to be detected are respectively measured and recorded; the direct-current internal resistance of the battery pack to be detected is calculated, and direct-current internal resistance of the battery cells is calculated; a judgment coefficient is calculated; according to the size relationship between the judgment coefficient and a preset threshold value, whether the connecting state of the battery pack is normal or not is judged. The defect that a traditional judgment method for the connecting state of the battery pack can only judge whether a short circuit or an open circuit occurs in a battery or not and can not comprehensively assess the connecting state of the battery pack is overcome, the connecting state of the battery pack is judged in real time, and safe use of the battery pack is guaranteed.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a method for judging the connection state of a battery pack. Background technique [0002] The battery pack is composed of a certain number of single cells or battery modules connected in series or in parallel to achieve the corresponding voltage or power level. At present, power battery packs are widely used in new energy vehicles, energy storage and other technical fields. In the process of forming a battery pack from batteries, the connection between batteries is essential. At present, the commonly used connection methods between batteries are divided into threaded connection and welding. Threaded connection is a simple mechanical fastening between bolts and nuts. The degree of fastening Affected by the applied external force, the connection method is simple in process and easy to replace. Welding is to weld the metal together by laser, ultrasonic and other methods. T...

Claims

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Application Information

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IPC IPC(8): G01R31/02
Inventor 张波林道勇
Owner 广州市锰光锂电池科技有限公司
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