Set making method capable of prolonging service life cycle of power battery pack

A technology of power battery packs and series battery packs, which is applied in the direction of secondary batteries, secondary battery repair/maintenance, circuits, etc., and can solve the problems of short battery life, inability to accurately select batteries with similar performance, and single grouping methods. To achieve the effect of improving the cycle life, increasing the service life and reducing the cost of use

Active Publication Date: 2015-04-29
CHAOWEI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art that the power battery matching method is relatively single, and batteries with similar performance cannot be accurately selected as the matching group, and the service life of the battery is short, and to provide a matching group that improves the cycle life of the power battery pack method

Method used

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  • Set making method capable of prolonging service life cycle of power battery pack
  • Set making method capable of prolonging service life cycle of power battery pack
  • Set making method capable of prolonging service life cycle of power battery pack

Examples

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Embodiment 1

[0027] Embodiment 1: a method for improving the cycle life of a power battery pack, the flow chart of which is as follows: figure 1 shown, including the following steps:

[0028] Step 1, select 20 batteries to be distributed with equal rated working voltages in series to form a series battery pack;

[0029] In step 2, the battery packs are connected in series to perform a discharge operation. After discharge, the voltage of a single battery drops. After the average voltage of several batteries reaches the specified first voltage of 10.7V, the discharge operation is terminated, and the voltage value of each battery at this time is recorded;

[0030] Step 3: Carry out constant voltage overcharge operation of the series connected battery pack. After the charging time of 12 hours has passed, the charging will be terminated. After the series connected battery pack has been allowed to stand for a period of 2 hours, the overcharge operation will be performed again. After the overchar...

Embodiment 2

[0037]Example 2, a method for improving the cycle life of a power battery pack, the principle and implementation method are basically the same as those in Example 1, the difference is that between step 5 and step 6, step 5a is also included, connecting the batteries in series. The group is placed in an environment where the temperature is greater than 50 °C, and it is allowed to stand for a period of time T4, and the voltage value of each battery at this time is recorded, and the difference between the voltage values ​​of each battery is recorded as ⊿V4; the step 6 constitutes The requirements of the battery pack also include that the maximum ⊿V4 between the individual batteries in the battery pack is within the specified range; place the series battery pack in an environment where the temperature is lower than 0 °C, and let it stand for a period of time T5, and record each battery pack. The voltage value of the battery at this time, and the difference between the voltage value...

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Abstract

The invention discloses a set making method capable of prolonging service life cycle of a power battery pack. The method comprises the following steps: selecting a plurality of to-be-assembled batteries with equal rated working voltage to be connected in series to form a serial battery pack; performing discharge operation on the serial battery pack, and recording the voltage value of each battery; performing constant-voltage overcharging operation on the serial battery pack and recording the voltage value of each battery; standing the overcharged serial battery pack for certain time, and then recording the voltage value of each battery; recording the differences among the voltage values of batteries as delta V1, delta V2 and delta V3; selecting a set quantity of batteries to form a battery pack with the requirement for enabling the maximum delta V1, delta V2 and delta V3 among every two single batteries in the battery pack to be within the specified range. According to the set making method, the batteries with very closely performances can be screened and selected for many times and form a serial battery pack, and the service life of the battery pack can be greatly prolonged.

Description

technical field [0001] The invention relates to the field of power batteries, in particular to a matching method for improving the cycle life of a power battery pack. Background technique [0002] In the field of power batteries, in order to meet the needs of power and cruising range, multiple batteries are usually connected in series to form a battery pack. In the power battery pack, the consistency of the performance parameters of each single battery determines the service life of the entire battery pack. Therefore, it is necessary to screen and match the single batteries according to certain conditions. The consistency of the charging characteristics of each single battery will affect the service life of the power battery pack. During the charging process, the battery with high voltage loses water quickly, and the loss of water causes the accumulation of the internal temperature of the battery, resulting in thermal runaway, and the loss of water increases the corrosion r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42
CPCH01M10/4207Y02E60/10
Inventor 张恭政马永泉王鹏伟
Owner CHAOWEI POWER CO LTD
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