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Electric automobile dynamic equalizing charge method

An electric vehicle and dynamic equalization technology, which is applied in electric vehicles, battery circuit devices, current collectors, etc., can solve the problems of small discharge current, inconsistent performance of single batteries, and can not really eliminate the inconsistency of battery packs, etc., to achieve the elimination of inconsistency Effect

Inactive Publication Date: 2013-04-17
DONGFENG XIANGYANG TOURING CAR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the energy consumption equalization method adopts the method of resistance consumption, and the battery management system is in a confined space, the discharge current is relatively small based on heat dissipation, so the equalization effect for large-capacity power batteries is not very significant
In addition, the energy-consumption equalization method can only discharge the single battery but not charge it, and cannot really eliminate the inconsistency of the battery pack. Another example is that the application number 201210006406.1 discloses a single battery power balance method and system, which solves the problem of battery pack The problem of inconsistency in the performance of the internal battery cells, the method of battery power balance is given, but the specific charging strategy is not given

Method used

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  • Electric automobile dynamic equalizing charge method
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Examples

Experimental program
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Effect test

Embodiment 1

[0023] When charging the battery of an electric vehicle, when the voltage of any battery cell in the battery pack is greater than 3.55V or the overall voltage is greater than 608V, the voltage reduction charging process (third stage) is performed, and the charging current is reduced to 50A; When the voltage of a single battery is greater than 3.575V or the overall voltage is greater than 610V, the charging current is reduced to 612V, and the charging current is reduced to 20A; when the voltage of any single battery in the battery pack is greater than 3.625V or the overall voltage is greater than 614V, the charging current is reduced to 10A; When the voltage of any battery cell in the battery pack is greater than 3.65V or the overall voltage is greater than 616V, stop charging the battery pack.

Embodiment 2

[0025] When charging the battery pack of an electric vehicle, when it is detected that the voltage of all battery cells in the battery pack is greater than 3V and not more than 3.55V, and the minimum battery cell voltage is lower than the average value and less than 10mv, and the overall battery voltage is not more than 608V , directly carry out the 100A current constant current charging process (the second stage); when the voltage of any one battery cell is greater than 3.55V or the overall battery voltage is greater than 608V, the current constant current charging process is ended, and the step-down charging process described in Example 1 is entered (third stage) until the end of charging.

Embodiment 3

[0027] When charging the battery of an electric vehicle, if the following two conditions are met at the same time, it will enter the 40A current constant current pre-charging process (first stage). Condition (1): When it is detected that the voltage of all battery cells in the battery pack is not Greater than 3.55V and the overall battery voltage is not greater than 608V; Condition (2): The voltage of any single battery is not greater than 3V or the lowest battery voltage in the battery pack is lower than the average value and not less than 10mv.

[0028] If the 40A current constant current precharging process exceeds 2 hours and the following two conditions are met at the same time, the 40A constant current precharging process ends and the 100A current constant current charging process (second stage) is entered. Condition (1): All cells When the battery voltage is still not greater than 3.55V, and the overall battery voltage is still not greater than 608V; condition (2) the vo...

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Abstract

The invention discloses an electric automobile dynamic equalizing charge method, solving the problem that inconsistent capacity and electric quantity and the like exist among batteries in battery packs when an existing pure electric automobile is charged. With the adoption of the electric automobile dynamic equalizing charge method, the batteries are equalized through designing three stages as follows: 40A current constant current precharge, 100A current constant current charge and reduction current charge, so that the inconsistence of the battery packs can be eliminated, the actual available capacity of the battery packs is improved, and the circulating service life of the battery packs is prolonged.

Description

technical field [0001] The invention belongs to a battery charging method, in particular to a dynamic balanced charging method for an electric vehicle. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles as power batteries. Due to inconsistencies in production, use conditions and use environments, there will be inconsistencies in capacity and power between batteries in the battery pack. [0003] Since the electric vehicle power battery is composed of hundreds of single cells in series, the inconsistency of the battery will affect the overall available capacity and cycle life of the battery pack. During the charging process, if any single battery is fully charged, the charging must be stopped; during the discharge process, the discharge must be stopped if any single battery is exhausted. At present, the energy consumption balancing method is adopted in the market. During the charging process, the single battery with the highest voltage is...

Claims

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Application Information

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IPC IPC(8): H02J7/00
Inventor 王贵山舒鹏周健何江华陈欢李大威肖俊童晓辉
Owner DONGFENG XIANGYANG TOURING CAR
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