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Battery charging method for electric road vehicle

A technology for road vehicles and charging methods, applied to secondary battery charging/discharging, batteries, circuits, etc., can solve the problems of uncontrollable battery charging process, reduce gas precipitation overpotential, electrolytic water gas evolution, etc., to reduce heat loss Water, reduced charging time, reduced effects of sulfation

Active Publication Date: 2017-03-29
ANHUI CHAOWEI POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] During the charging and discharging process of the battery, due to gassing, the electrolyte gradually decreases, the oxygen cycle recombination current increases, and some harmful elements on the positive electrode precipitate to the negative electrode, which reduces the overpotential of gas precipitation, and is affected by the temperature change of the battery. The current gradually increases in the final stage, which eventually leads to the uncontrollable charging process of the battery, resulting in a large amount of electrolyzed water gassing

Method used

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  • Battery charging method for electric road vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] [Example 1] Charging method of 3EVF200 (8 pieces / set of 24 single storage batteries) battery pack in an environment of 25°C

[0063] Step 1. Pre-charging: The battery pack is charged with a corresponding current of 3.5A, and its voltage is gradually increased to 48V, and its charging time is ≤3h;

[0064] Step 2. Constant current charging: the battery pack is charged with a corresponding current of 30A, the charging voltage is gradually increased to 57.6V, and the total charging time is ≤6h;

[0065] Step 3. Double-limit charging: When charging with a maximum current of 30A to 57.6V, the charging current gradually decreases, the voltage of the battery pack slowly rises to 58.8V, and when the charging current gradually decreases to 3.5A, transfer to the next step of charging. The total charging time ≤2h;

[0066] Step 4. Trickle charging: the trickle charging current is 3.5A, and the charging time is ≤1h;

[0067] Step 5. Float charging: the voltage limit is 55.4V, the...

Embodiment 2

[0069] [Example 2] Charging method of 3EVF200 (8 pieces / set of 24 single storage batteries) battery pack in an environment of 40°C

[0070] Step 1. Pre-charging: The battery pack is charged with a corresponding current of 3.5A, and its voltage is gradually increased to 48V, and its charging time is ≤3h;

[0071] Step 2. Constant current charging: the battery pack is charged with a corresponding current of 30A, the charging voltage is gradually increased to 57.6V, and the total charging time is ≤6h;

[0072] Step 3. Double-limit charging: When charging with a maximum current of 30A to 57.6V, the charging current gradually decreases, the voltage of the battery pack slowly rises to 57.7V, and when the charging current gradually decreases to 3.5A, transfer to the next step of charging. The total charging time ≤2h;

[0073] Step 4. Trickle charging: trickle charging current 3.5A, charging ≤ 1h;

[0074] Step 5. Float charging: limit voltage to 54V, limit current to 2.7A and charg...

Embodiment 3

[0077] [Example 3] Charging method of 3EVF200 (8 pieces / set of 24 single storage batteries) battery pack in -15°C environment

[0078] Step 1. Pre-charging: The battery pack is charged with a corresponding current of 3.5A, and its voltage is gradually increased to 48V, and its charging time is ≤2h;

[0079] Step 2. Constant current charging: the battery pack is charged with a corresponding current of 30A, the charging voltage is gradually increased to 57.6V, and the total charging time is ≤6h;

[0080] Step 3. Double-limit charging: When charging with a maximum current of 30A to 57.6V, the charging current begins to drop, the voltage of the battery pack slowly rises to 61.6V, and when the charging current gradually decreases to 3.5A, it is transferred to the next step of charging. The total charging time ≤2h;

[0081] Step 4. Trickle charging: trickle charging current 3.5A, charging time ≤ 1h;

[0082] Step 5. Float charge: charge with a voltage limit of 59.2V and a current ...

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Abstract

The invention relates to a method for charging a storage battery for electrically propelled road vehicles. The method comprises the following steps: 1, pre-charging; 2, charging with constant current; 3, charging with double thresholds; 4, charging with trickle current; and 5, charging in a float mode, wherein temperature compensation is required in the five steps. According to the method, the charging voltage in the charging process is controlled, gas generated by electrolysis of water caused by high charging voltage of a storage battery / storage battery pack can be reduced, so that the amount of electrolyte can be guaranteed; and the charging voltage value can be controlled according to different temperatures, so that the storage battery / storage battery pack can be fully charged at low temperature, water loss of the storage battery / storage battery pack at high temperature can be reduced, and the service life of the storage battery / storage battery pack can be prolonged.

Description

technical field [0001] The invention relates to a charging method during use of a lead-acid battery, in particular to a charging method for a lead-acid battery used in an electric road vehicle. Background technique [0002] Valve-regulated lead-acid batteries are used as power in low-speed new energy electric vehicles, such as pure electric vehicles, plug-in hybrid vehicles and extended-range electric vehicles. As an energy storage device, a valve-regulated lead-acid battery is generally used together by combining multiple batteries into a battery pack. The test shows that the battery begins to form gas when it is charged at 2.4V / cell, and the gas evolution speed accelerates when it reaches 2.6V / cell. . [0003] During the charging and discharging process of the battery, due to gassing, the electrolyte gradually decreases, the oxygen cycle recombination current increases, and some harmful elements on the positive electrode precipitate to the negative electrode, which reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44
CPCH01M10/443H01M2220/20Y02E60/10
Inventor 舒红群刘孝伟宋昭润余有亮
Owner ANHUI CHAOWEI POWER
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