Method for detecting electrical property consistency of lithium ion battery

A lithium-ion battery and detection method technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as large differences in electrical properties, achieve excellent performance, enhance product use experience, and have the effect of great practical significance in production

Active Publication Date: 2010-12-08
TIANJIN LISHEN BATTERY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of this, the purpose of the present invention is to provide a detection method for the consistency of electrical properties of lithium-ion batteries, which can detect the consistency of electrical properties of lithium-ion batteries under low temperature conditions, and effectively solve the problem of each single battery at room temperature. It shows good consistency of electrical properties under low temperature conditions, and the problem of large differences in electrical properties under low temperature conditions is suitable for testing large quantities of batteries, screening out qualified single cells to form battery packs, and ensuring that the battery packs are kept in a low temperature environment. It has excellent performance, so it can greatly enhance the product experience of battery users, and is suitable for large-scale production applications, which has great practical significance in production

Method used

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  • Method for detecting electrical property consistency of lithium ion battery
  • Method for detecting electrical property consistency of lithium ion battery
  • Method for detecting electrical property consistency of lithium ion battery

Examples

Experimental program
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Effect test

Embodiment 1

[0056] After a lithium-ion battery with a nominal capacity of 2Ah is activated (formation) for the first charge and discharge, it is charged to a fully charged state of 4.2±0.02V, and the voltage of the battery is measured after being left at room temperature for 1 day, and recorded as V1. After aging for 7 days in a high temperature environment, measure the voltage of the battery and record it as V2, and compare the voltage difference △V measured twice with the same battery, that is, △V=V1-V2, and use the battery with △V≥30mV as self-discharge Pick out the large batteries, and then classify the remaining qualified batteries according to △V=0~10mV, 10~20mV, and 20~30mV.

[0057] Sorting the batteries to obtain qualified products in terms of size, appearance, and internal resistance, and then dividing the batteries to obtain the discharge capacity C of the batteries, and then charging the batteries to 3.85V at a constant current, and then charging at a constant voltage to the cu...

Embodiment 2

[0061] A battery with a nominal capacity of 2Ah was subjected to a capacity test and an AC internal resistance test at room temperature to record data, and after standing at -40°C for 4 hours (hours), the same test method as in Example 1 was used to test the low-temperature DC internal resistance Test, and then carry out 0.65C constant current discharge at -40°C temperature, collect discharge capacity data, the results are as follows Figure 5 shown. The test results show that the ordinary AC internal resistance test at room temperature cannot reflect the low-temperature discharge characteristics of the battery, and the low-temperature DC internal resistance value is very consistent with the low-temperature discharge capacity of the battery.

[0062] The method for detecting the consistency of the electrical properties of the lithium-ion battery provided by the present invention is especially for the detection of the consistency of the lithium-ion battery under low temperature...

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Abstract

The invention discloses a method for detecting the electrical property consistency of lithium ion battery. The method comprises the following steps of: performing formation storage and ageing storage on a plurality of monomer batteries for a long time one by one and selecting the battery with large self discharge; performing capacity grading treatment on the rest of qualified monomer batteries to obtain the actual battery volume C of the plurality of monomer batteries, charging the plurality of monomer batteries to the same charging state and classifying the plurality of batteries according to the volume difference standard; performing low-temperature direct-current internal resistance test on the plurality of batteries with the same volume difference standard grade and reclassifying the battery according to the direct-current internal resistance of the battery; and selecting and matching the plurality of batteries in the same direct-current internal resistance grade to form the battery pack. The invention can detect the electrical property consistency of the lithium ion battery under the low-temperature condition, effectively solve the problem that the battery has good electrical property consistency under the normal-temperature condition and differed electrical property consistency under the low-temperature condition and is suitable for detecting a batch of batteries and selecting qualified monomer batteries to form a battery pack.

Description

technical field [0001] The invention relates to the technical field of battery detection, in particular to a detection method for the consistency of electrical properties of lithium-ion batteries. Background technique [0002] At present, lithium-ion batteries have the incomparable advantages of other energy storage batteries, such as high energy density, light weight, and good safety performance. It has also been widely used in bicycles and electric vehicles, and it is also very attractive for military fields such as aerospace, aviation, and field operations. In addition, in the military field, high requirements are placed on the operating temperature range and energy of lithium-ion batteries. Generally, it is required to be able to work at least at a temperature of -40~60°C, and even at a temperature of -50°C. At present, high energy is mainly obtained by combining batteries in series and parallel. For example, 14.4V10Ah and 25.2V20Ah high-capacity battery packs can be ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
Inventor 阳晓霞程君冯辉陈欣张润雯
Owner TIANJIN LISHEN BATTERY
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