CN-114899929-B - Power supply control method and device for battery system

CN114899929BCN 114899929 BCN114899929 BCN 114899929BCN-114899929-B

Abstract

The invention provides a power supply control method and device of a battery system, wherein the power supply control method of the battery system comprises the steps of respectively obtaining current charge parameters and current output currents of a main battery module and first battery modules and current total output currents of the battery system, determining a target power supply mode according to the current charge parameters of the main battery module and the first battery modules, calculating target output currents of the main battery module and/or the first battery modules by using the current parameters and the current total output currents corresponding to the main battery module and/or the first battery modules based on the target power supply mode, and controlling the main battery module and/or the first battery modules to supply power to a target object according to the target output currents of the main battery module and/or the first battery modules. The cruising ability of the target object is improved while the state of charge balance between the main battery module and each first battery module inside the target object is fully considered.

Inventors

CAO YUAN
TANG DAN

Assignees

三一技术装备有限公司

Dates

Publication Date: 20260508
Application Date: 20220429

Claims (9)

1. The power supply control method of the battery system is characterized in that the battery system comprises a main battery module and a plurality of replaceable first battery modules, wherein the first battery modules are connected with the main battery module in parallel and then supply power for a target object, and the method comprises the following steps: Respectively acquiring current charge parameters, current output currents and current total output currents of the main battery module and each first battery module; Determining a target power supply mode according to the current charge parameters of the main battery module and each first battery module; Calculating a target output current of the main battery module and/or each first battery module by using the current charge parameter, the current output current and the current total output current corresponding to the main battery module and/or each first battery module based on the target power supply mode; controlling the main battery module and/or each first battery module to supply power to the target object according to the target output current of the main battery module and/or each first battery module; When the target power supply mode is a hybrid power supply mode, the calculating the target output currents of the main battery module and the first battery modules by using the current charge parameters, the current output currents and the current total output currents corresponding to the main battery module and the first battery modules includes calculating the current average charge parameters of the first battery modules based on the current charge parameters corresponding to the first battery modules, and calculating the target output currents of the main battery module and the first battery modules based on the current charge parameters of the main battery module, the current average charge parameters of the first battery modules and the current total output currents, respectively.
2. The method of claim 1, wherein determining a target power mode based on current charge parameters of the main battery module and each of the first battery modules comprises: Respectively judging whether the current charge parameters of the main battery module and the current charge parameters of the first battery modules exceed a preset electric quantity threshold value or not; when the current charge parameters of the main battery module and the current charge parameters of the first battery modules exceed the preset electric quantity threshold, determining a hybrid power supply mode of the main battery module and the first battery modules as a target power supply mode; When the current charge parameters of the main battery modules do not exceed the preset electric quantity threshold, and the current charge parameters of the first battery modules exceed the preset electric quantity threshold, determining the power supply mode of the first battery modules as a target power supply mode; And when the current charge parameters of the main battery modules exceed the preset electric quantity threshold, and the current charge parameters of the first battery modules do not exceed the preset electric quantity threshold, determining the power supply mode of the main battery modules as a target power supply mode.
3. The method of claim 1, wherein controlling the main battery module and each of the first battery modules to supply power to the target object according to the target output current of the main battery module and each of the first battery modules comprises: Respectively calculating a first deviation degree between the target output current of the main battery module and the current output current of the main battery module and a second deviation degree between the target output current of each first battery module and the current output current of the first battery module; Generating a first control instruction based on the first degree of deviation; generating a second control instruction based on the second degree of deviation; And regulating the output current of the main battery module according to the first control instruction, and regulating the output current of each first battery module according to the second control instruction corresponding to each first battery module.
4. A method according to claim 3, wherein said generating a second control instruction based on said second degree of deviation comprises: determining the duty ratio of a driving signal corresponding to the current first battery module based on the second deviation of the current first battery module; the second control instruction is generated based on the duty cycle.
5. The method according to claim 2, wherein the method further comprises: And when the current charge parameters of the main battery module and the current charge parameters of the first battery modules do not exceed the preset electric quantity threshold, maintaining a current power supply mode and giving an alarm prompt.
6. The method according to claim 1, wherein the method further comprises: And returning to the step of respectively acquiring the current charge parameters, the current output current and the current total output current of the battery system of the main battery module and each first battery module after the replacement of at least one group of the first battery modules is monitored.
7. The power supply control device of the battery system is characterized by comprising a main battery module and a plurality of replaceable first battery modules, wherein the first battery modules are connected with the main battery module in parallel and then supply power for a target object, and the device comprises: The acquisition module is used for respectively acquiring the current charge parameters, the current output current and the current total output current of the battery system of the main battery module and each first battery module; the first processing module is used for determining a target power supply mode according to the current charge parameters of the main battery module and each first battery module; The second processing module is used for calculating the target output current of the main battery module and/or each first battery module by using the current charge parameter, the current output current and the current total output current corresponding to the main battery module and/or each first battery module based on the target power supply mode; the third processing module is used for controlling the main battery module and/or each first battery module to supply power to the target object according to the target output current of the main battery module and/or each first battery module; The second processing module is configured to calculate, when the target power supply mode is a hybrid power supply mode, target output currents of the main battery module and each first battery module by using the current charge parameters, the current output currents, and the current total output currents corresponding to the main battery module and each first battery module, where the second processing module is configured to calculate, based on the current charge parameters corresponding to each first battery module, a current average charge parameter of the first battery module, and calculate, based on the current charge parameters of the main battery module, the current average charge parameters of each first battery module, and the current total output currents, target output currents of the main battery module and each first battery module, respectively.
8. An electronic device, comprising: a memory and a processor in communication with each other, the memory having stored therein computer instructions, the processor executing the computer instructions to perform the method of any of claims 1-6.
9. A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, the computer instructions for causing a computer to perform the method of any one of claims 1-6.

Description

Power supply control method and device for battery system Technical Field The invention relates to the field of electric automobiles, in particular to a power supply control method and device of a battery system. Background "Mileage anxiety" has been a key issue limiting the development of electric vehicles. In order to improve the cruising ability of electric vehicles, research and development staff put forward different solutions, including improving the capacity of the battery module of the electric vehicle, rapidly charging the battery module, wirelessly charging, etc., but these methods have the problems of high manufacturing cost, complex wiring, immature technology, etc., so numerous electric vehicle manufacturers determine the replacement of the battery module as a key technology for intensive research and development. The traditional power conversion mode comprises top hanging power conversion, lateral power conversion and bottom power conversion, but no matter which power conversion mode is adopted, the whole car battery pack needs to be replaced when power conversion is carried out, so that a whole set of power conversion equipment comprising a mechanical structure and an electrical structure is needed, the cost is high, and for an electric car provided with a power conversion module, the endurance of the electric car can be influenced for a long time due to the fact that the power conversion module and a main battery module possibly have unbalanced charge. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to overcome the limitation that the battery replacement module of the electric automobile can only be replaced integrally in the prior art, and the defect that the endurance of the electric automobile is affected because of the unbalance of the charge state between the battery replacement module and the main battery module is not considered, so that the power supply control method and the power supply control device of the battery system are provided. According to a first aspect, an embodiment of the present invention provides a power supply control method for a battery system, where the battery system includes a main battery module and a plurality of replaceable first battery modules, and the first battery modules are connected in parallel with the main battery module and supply power to a target object, and the method includes: Respectively acquiring current charge parameters, current output currents and current total output currents of the main battery module and each first battery module; Determining a target power supply mode according to the current charge parameters of the main battery module and each first battery module; Calculating a target output current of the main battery module and/or each first battery module by using the current charge parameter, the current output current and the current total output current corresponding to the main battery module and/or each first battery module based on the target power supply mode; and controlling the main battery module and/or each first battery module to supply power to the target object according to the target output current of the main battery module and/or each first battery module. Optionally, the determining the target power supply mode according to the current charge parameters of the main battery module and each of the first battery modules includes: Respectively judging whether the current charge parameters of the main battery module and the current charge parameters of the first battery modules exceed a preset electric quantity threshold value or not; when the current charge parameters of the main battery module and the current charge parameters of the first battery modules exceed the preset electric quantity threshold, determining a hybrid power supply mode of the main battery module and the first battery modules as a target power supply mode; When the current charge parameters of the main battery modules do not exceed the preset electric quantity threshold, and the current charge parameters of the first battery modules exceed the preset electric quantity threshold, determining the power supply mode of the first battery modules as a target power supply mode; And when the current charge parameters of the main battery modules exceed the preset electric quantity threshold, and the current charge parameters of the first battery modules do not exceed the preset electric quantity threshold, determining the power supply mode of the main battery modules as a target power supply mode. Optionally, when the target power supply mode is a hybrid power supply mode, the calculating the target output currents of the main battery module and each of the first battery modules by using the current charge parameters, the current output currents, and the current total output currents corresponding to the main battery module and each of the first battery modules includes: calculating the current average charge p