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Detection and determination method for battery micro short circuit

A judging method and micro-short-circuit technology, which are applied to the components of electrical measuring instruments, measuring electronics, and measuring devices, can solve the problems of high battery production cost and long cycle, and achieve simple structure, low production cost and improved quality. Effect

Inactive Publication Date: 2018-11-30
湖南科霸汽车动力电池有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the field of power batteries, hundreds or even thousands of batteries are often connected in series or parallel to form an energy pack. As long as one of the cells has a micro-short circuit, the life of the entire energy pack will be affected. The conventional method is generally to charge and discharge the battery. After the completion, the micro-short circuit battery is selected by high temperature acceleration, vibration and other methods. This method makes the battery production cost higher and the cycle longer

Method used

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  • Detection and determination method for battery micro short circuit

Examples

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Effect test

Embodiment 1

[0018] A method for detecting and judging a battery micro-short circuit. The non-fluid nickel-hydrogen D6000 battery is fixedly installed in a battery fixing fixture of a battery micro-short circuit detection device, and the non-fluid battery is pressurized. The positive end of the non-fluid nickel-metal hydride battery is Contact with the positive terminal of the battery fixing jig, the negative terminal of the unfilled NiMH battery is in contact with the negative terminal of the battery fixing jig, and pressurize the battery fixing jig through the air cylinder, so that the battery fixing jig can pressurize the unfilled battery And its pressure value is above 5N, then turn on the 380V constant current regulated power supply to charge the capacitor in the battery micro-short circuit detection device for 46ms, after the capacitor is fully charged, disconnect the 380V constant current regulated power supply and The control capacitor discharges the unfilled battery instantaneously...

Embodiment 2

[0021] A method for detecting and judging a battery micro-short circuit, the steps of which are basically the same as those of the method for detecting and judging a battery micro-short circuit in Example 1. The power supply in the short-circuit detection device is a 220V constant current regulated power supply, the capacitor charging time is 80ms, the capacitor instantaneous discharge time is 25ms, and the set standard current value is 2.5A.

Embodiment 3

[0023] A method for detecting and judging a battery micro-short circuit, the steps of which are basically the same as those of the method for detecting and judging a battery micro-short circuit in Embodiment 1. The difference is: the battery is a lithium battery 32650 without liquid injection, and the set standard current The value is 7A.

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Abstract

The invention provides a detection and determination method for battery micro short circuit. The method comprises the following steps that a battery without liquid injection is fixedly arranged in a battery fixing clamp of a battery micro short circuit detection device for pressurization; a power supply is connected to charge a capacitor; after the capacitor is fully charged, the power supply is disconnected and the capacitor is controlled to carry out instantaneous discharge on the battery without liquid injection; during an instantaneous discharge process of the capacitor, a voltage acquisition device acquires a voltage value of a resistor in the battery micro short circuit detection device once at a certain interval and transmits the voltage value to a PLC; an instantaneous current value passing through the resistor is computed in the PLC, and a maximum value of the instantaneous current value passing through the resistor is compared with a set standard current value; and if the maximum value of the instantaneous current value passing through the resistor is larger than or equal to the set standard current value, the battery without liquid injection is determined as a micro short circuit battery, and otherwise the battery without liquid injection is determined as a qualified battery. The method is simple and feasible, and the micro short circuit battery can be quickly and accurately identified.

Description

technical field [0001] The invention relates to a detection and determination method for battery micro-short circuit. Background technique [0002] In the field of batteries, during the winding process of the positive electrode, the negative electrode and the separator, the positive and negative electrodes may occasionally produce burrs, or foreign matter such as dust may be mixed in, resulting in a micro-short circuit of the wound battery. The voltage and other indicators of the micro-short-circuit battery are not significantly different from those of the normal battery. In the field of power batteries, hundreds or even thousands of batteries are often connected in series or parallel to form an energy pack. As long as one of the cells is slightly short-circuited, the life of the entire energy pack will be affected, and the conventional method is to charge and discharge the battery. After completion, the micro-short-circuit battery is selected by high temperature accelerati...

Claims

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Application Information

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IPC IPC(8): G01R31/36G01R1/04
CPCG01R1/0425
Inventor 钟发平万正坤柳立新胡向宇张平平廖钦波文佳
Owner 湖南科霸汽车动力电池有限责任公司
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