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Power battery current control method and device, electric vehicle and storage medium

A power battery and current control technology, applied in the field of electric vehicles, storage media, and power battery current control, can solve problems such as the inability to guarantee the accuracy of battery pack current, and achieve the effects of improving maintenance efficiency, ensuring reliability, and reducing maintenance costs.

Pending Publication Date: 2022-07-15
WEICHAI POWER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a power battery current control method, device, electric vehicle and storage medium to solve the problem that the prior art cannot guarantee the accuracy of the battery pack current collected by the battery management system BMS

Method used

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  • Power battery current control method and device, electric vehicle and storage medium
  • Power battery current control method and device, electric vehicle and storage medium
  • Power battery current control method and device, electric vehicle and storage medium

Examples

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Effect test

Embodiment 1

[0049] figure 1 The first embodiment of the present invention provides a flow chart of a power battery current control method, figure 2 It is an electrical architecture diagram of a high-voltage circuit of a power battery electric vehicle to which the embodiment of the present invention is applied. This embodiment can be applied to the current correction of the current value of the battery pack of the power battery of the direct-drive electric vehicle. The current control of the power battery The method may be performed by a power battery current control device, which may be implemented in the form of hardware and / or software, and may be configured in an electric vehicle or a vehicle controller of an electric vehicle. like figure 1 As shown, the power battery current control method includes:

[0050] S110. Acquire, through the vehicle controller, the vehicle running state of the electric vehicle, the state of the battery management system, the state of the power distributio...

Embodiment 2

[0071] image 3 This is a flowchart of a power battery current control method provided in the second embodiment of the present invention. On the basis of the above-mentioned embodiment, the judgment and correction of the battery pack current value of the power battery of the direct drive electric vehicle are further described. like image 3 As shown, the power battery current control method includes:

[0072] S310 , the vehicle running state, the battery management system state, the power distribution unit state, the current motor torque, the current motor speed, and the current bus voltage of the electric vehicle are acquired through the vehicle controller.

[0073] S320: Determine whether the state of the battery management system is a fault-free state, if yes, execute step S330, if not, end the correction of the current value of the battery pack of the power battery of the direct drive electric vehicle.

[0074] S330: Determine whether the vehicle is in the cruise mode an...

Embodiment 3

[0084] Figure 4 A flow chart of a power battery current control method provided in the third embodiment of the present invention, on the basis of the above-mentioned present embodiment, the current value of the battery pack of the power battery of the direct-drive electric vehicle. like Figure 4 As shown, the power battery current control method includes:

[0085] S410 , the vehicle running state, the battery management system state, the power distribution unit state, the current motor torque, the current motor speed, and the current bus voltage of the electric vehicle are acquired through the vehicle controller.

[0086] S411 , judging whether the state of the battery management system is a fault-free state, and if so, execute step S412 , if not, end the correction of the current value of the battery pack of the power battery of the direct-drive electric vehicle.

[0087] S412: Determine whether the vehicle is in cruise mode and the energy recovery is not turned on. If so...

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Abstract

The invention discloses a power battery current control method and device, an electric vehicle and a storage medium. According to the technical scheme, by judging the driving state of the power battery electric vehicle, the current motor torque, the current motor rotating speed, the current bus voltage and the power distribution unit parameters of the electric vehicle are obtained when the relatively ideal working state is achieved; a current motor driving bus current value is determined by querying a motor driving data comparison table, a current power distribution unit loop current value is determined by combining power distribution unit parameters, current correction parameters of the battery management system are calculated, errors possibly caused by temperature drift, null drift, overload and magnetic saturation during current detection of the battery management system are made up, and the current detection accuracy is improved. According to the method, the battery management system BMS can obtain the accurate current value of the power battery pack, the reliability of the battery management system BMS is guaranteed, meanwhile, the maintenance cost of all parts of the electric automobile is low, and the maintenance efficiency is improved.

Description

technical field [0001] The present invention relates to the technical field of power battery control, in particular to a power battery current control method, device, electric vehicle and storage medium. Background technique [0002] In recent years, due to the increasingly prominent problems of climate change, environmental pollution and energy crisis, high-efficiency and zero-emission electric vehicles have been developed on a large scale. Power battery has become the preferred solution for electric vehicles, but its safety, cost and cycle performance have always restricted the market competitiveness of electric vehicles. Among them, the impact of battery pack current on the performance and stability of power batteries is particularly affected by people of attention. [0003] The main functions of the battery management system (BMS) include collecting the voltage, current and temperature data of the power battery, accurately estimating the remaining power (SOC) of the pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L58/10
CPCB60L58/10B60L2240/10B60L2240/12B60L2240/42B60L2240/421B60L2240/40B60L2240/423B60L2240/429B60L2240/427B60L2240/549
Inventor 王德军许成林王文霞于洪峰
Owner WEICHAI POWER CO LTD
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