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Battery pack residual charging time estimation method

A technology of charging time and battery packs, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as poor user experience, relatively large error in remaining time, jumping, etc., and achieve the effect of improving accuracy and being easy to grasp

Active Publication Date: 2018-08-24
HUIZHOU EPOWER ELECTRONICS
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Problems solved by technology

[0004] Its shortcomings and shortcomings are: in the current estimation method of remaining charging time, only the normal charging mode is considered in the overall charging mode, that is, the constant current mode first, and then the constant voltage mode
If the error of the current SOC value is relatively large at the beginning, the estimated remaining time will have a relatively large error, and the full capacity is the rated capacity of the battery pack directly used, without considering the actual capacity of the battery pack after decay
At the same time, the current current will fluctuate frequently due to the measurement error, which will cause the estimated remaining charging time to fluctuate greatly, and the estimated remaining charging time will obviously bring a relatively poor result to the user. to experience

Method used

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Embodiment Construction

[0028] In order to facilitate those skilled in the art to understand the technical content of the present invention, the present invention will be further described in detail below in conjunction with specific embodiments.

[0029] In the specific implementation, the remaining charging time of the battery pack is estimated, the preheating charging time is calculated first, and the real-time temperature of each battery cell in the battery pack is detected. If the lowest value Tmin of the real-time temperature of the battery cell is detected to be lower than the set To set the minimum charging temperature, preheating is required to heat the battery cells to the set target temperature Ttarget. The target temperature Ttarget can be set directly according to the minimum charging temperature. Ttarget can also be set according to the temperature range of Tmin at the beginning of heating. Set different values ​​Ttarget1 and Ttarget2, Ttarget1> Ttarget2. If charging and heating starts,...

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Abstract

The invention provides a battery pack residual charging time estimation method. The method comprises the steps of calculating the pre-heating charging time, detecting the real-time temperature of eachbattery cell in the battery pack, and if the minimum value Tmin in the real-time temperature of the battery cell is detected to be lower than the set minimum charging temperature, carrying out the pre-heating to heat the battery cell to a set target temperature Ttarget, and heating according to a preset heating temperature rise rate delta T, the pre-heating charging time TIME1 being equal to delta T*(Ttarget)-Tmin); if the real-time temperature of the battery pack is larger than the set charging minimum temperature, the TIME1 being equal to 0; calculating the constant-current charging time TIME2 needed by the constant-current charging stage of the battery pack; calculating the constant-voltage charging time TIME3 required by the constant-voltage charging stage of the battery pack; and calculating the residual charging time of the battery pack T=TIME1+TIME2+TIME3.

Description

technical field [0001] The invention relates to the application field of battery packs, in particular to a method for estimating the remaining charging time of a battery pack. Background technique [0002] In the field of electric vehicles, charging the battery pack is a frequent operation for users, and electric vehicles usually estimate the remaining charging time of the battery pack, that is, how long it will take to fully charge the battery pack, and then display it to the user. [0003] At present, the methods for estimating the remaining charging time of the battery pack are combined with the charging mode of the battery pack for superposition estimation. The current main charging mode and method is the constant current-constant voltage method, and then calculate the remaining charging time required by the constant current mode and constant voltage mode respectively, and then add them to estimate the total remaining charging time of the battery pack. [0004] Its shor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCG01R31/3646G01R31/3648G01R31/392
Inventor 刘飞文锋张维戈文灿飞
Owner HUIZHOU EPOWER ELECTRONICS
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