Multi-branch power battery charging and discharging current adjusting method and device, readable storage medium and program product

Abstract

The invention discloses a multi-branch power battery charging and discharging current adjusting method and device, a readable storage medium and a program product. The method comprises the steps that S1, whether the actual value of the current charging / discharging current of each branch meets the condition or not is judged; if yes, entering the next step; s2, reducing the current total request charging / discharging current; s3, judging whether the actual value of the current charging / discharging current of each branch after adjustment meets a condition or not; if yes, returning to the step S2, otherwise, entering the next step; s4, judging whether the maximum difference value of the actual charging / discharging current values of the branches meets a condition or not; if yes, increasing the current total request charging / discharging current, and returning to S3; otherwise, maintaining the current total requested charge / discharge current. According to the invention, the charging current can be dynamically adjusted in real time according to the current condition of each branch, and the technical problem that the service life of the battery is affected and safety risk is caused due to inconsistent current among the branches during charging and discharging of the existing battery system is solved.

Description

Technical Field

[0001] The present invention relates to the field of new energy battery management, and in particular to a method, device, readable storage medium and program product for regulating charging and discharging current of a multi-branch power battery. Background Art

[0002] In recent years, new energy technologies have developed rapidly. Pure electric vehicles in the new energy field use electricity as the main driving energy source. In order to achieve high voltage and high power status, multiple battery packs are connected in series to form a branch, and then multiple branches connected in series are connected in parallel to form a complete set of high-voltage power battery systems. However, the layout space of the vehicle is currently limited. Some power boxes are placed on the roof and some are placed at the back of the vehicle. This will cause differences in the environment and power line length of each branch, resulting in inconsistent currents between branches when the battery system is charged and discharged. If the current is not adjusted, it may cause a branch to operate in an overcurrent state, exceeding the actual allowable current value of the branch, affecting the battery life, and even causing safety risks. Summary of the invention

[0003] The present invention provides a multi-branch power battery charging and discharging current regulation method, device, readable storage medium and program product, which can dynamically regulate the charging current according to the current conditions of each branch in real time, improve the charging efficiency on the basis of ensuring the safety of the battery system, and solve the technical problem that the current inconsistency between the branches during charging and discharging of the existing battery system may cause a branch to operate in an overcurrent state, exceeding the current value actually allowed by the branch, affecting the battery life and causing safety risks.

[0004] To achieve the above object, the present invention adopts the following technical solution.

[0005] On the one hand, a method for regulating charging and discharging current of a multi-branch power battery is provided, the method comprising the following steps:

[0006] S1. Determine whether the actual value I of the current charge / discharge current of each branch meets the following conditions: I>I lim ;

[0007] If there is a branch that meets the conditions, it is judged as a branch overcurrent fault and proceeds to the next step;

[0008] in, N is the number of branches, X1 is the coefficient, X1>1; I 总 is the total allowable charge / discharge current of the battery system, obtained according to the current state of the battery system;

[0009] S2, reduce the total requested charge / discharge current by ΔI1; where ΔI1=II lim ; will I总 The value of is updated to the total requested charge / discharge current after the adjustment, and the next step is entered;

[0010] S3, determine whether the actual value I of the current charging / discharging current of each branch meets the following conditions: I>I lim ;

[0011] If there is a branch that meets the conditions, it is determined to be a branch overcurrent fault, and the process returns to step S2;

[0012] Otherwise proceed to the next step;

[0013] S4, determine whether the maximum difference ΔI of the actual value of the charging / discharging current of each branch meets the following conditions: ΔI 总 *X2; if the conditions are met, the total requested charge / discharge current is increased by ΔI2, and I 总 The value of is updated to the total requested charge / discharge current after the increase, and the process returns to step S3;

[0014] Otherwise, maintain the current total requested charge / discharge current;

[0015] Where ΔI2=I 总 *X2-ΔI, X2 is the coefficient, X2<1.

[0016] In some embodiments, if the increased total requested charge / discharge current is greater than the total charge / discharge current allowable value corresponding to the battery system in the current state, the current total requested charge / discharge current is adjusted to the total charge / discharge current allowable value corresponding to the battery system in the current state.

[0017] In some embodiments, if the total requested charge / discharge current after reduction is lower than half of the total charge / discharge current allowable value corresponding to the battery system in the current state, and a branch overcurrent fault still exists, the overcurrent fault is reported and charging / discharging is stopped.

[0018] In some embodiments, in step S1, if the current actual value I of the charge / discharge current of each branch does not meet the corresponding condition, the current total requested charge / discharge current is maintained and it is continuously determined whether the current actual value I of the charge / discharge current of each branch meets the corresponding condition.

[0019] In some embodiments, in step S4, if the maximum difference ΔI of the actual values ​​of the charge / discharge currents of the branches does not meet the corresponding condition, the current total requested charge / discharge current is maintained and the process returns to step S1.

[0020] On the other hand, a multi-branch power battery charging and discharging current regulating device is provided, comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the above method. ​

[0021] On the other hand, a computer-readable storage medium is provided, on which a computer program / instruction is stored, characterized in that the computer program / instruction implements the steps of the above method when executed by a processor.

[0022] On the other hand, a computer program product is provided, comprising a computer program / instruction, characterized in that the computer program / instruction implements the steps of the above method when executed by a processor.

[0023] The present invention has at least the following technical effects or advantages: the charging current can be dynamically adjusted in real time according to the current conditions of each branch, thereby improving the charging efficiency while ensuring the safety of the battery system, and solving the technical problem that the currents between the branches are inconsistent during charging and discharging of the existing battery system, which may cause a branch to operate in an overcurrent state and exceed the current value actually allowed by the branch, affecting the battery life and causing safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a flow chart of a method for regulating charging and discharging current of a multi-branch power battery in one embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] See also Figure 1 , a multi-branch power battery charging and discharging current regulation method, comprising the following steps:

[0027] S1. Determine whether the actual value I of the charging / discharging current of each branch meets the following conditions: I>I lim ;

[0028] If there is a branch that meets the conditions, it is judged as a branch overcurrent fault and proceeds to the next step;

[0029] Otherwise, the current total requested charging / discharging current is maintained and the current actual charging / discharging current value I of each branch is continuously determined to determine whether it meets the corresponding conditions;

[0030] in, N is the number of branches, X1 is the coefficient, X1>1; I 总 is the total charge / discharge current allowable value of the battery system, which is obtained according to the current state of the battery system; preferably, the value of X1 may be 1.2.

[0031] S2, reduce the total requested charge / discharge current by ΔI1; where ΔI1=II lim ; will I 总The value of is updated to the total requested charge / discharge current after the adjustment, and the next step is entered;

[0032] S3, determine whether the actual value I of the current charging / discharging current of each branch meets the following conditions: I>I lim ;

[0033] If there is a branch that meets the conditions, it is determined to be a branch overcurrent fault, and the process returns to step S2;

[0034] Otherwise proceed to the next step;

[0035] S4, determine whether the maximum difference ΔI of the actual value of the charging / discharging current of each branch meets the following conditions: ΔI 总 *X2; if the conditions are met, the total requested charge / discharge current is increased by ΔI2, and I 总 The value of is updated to the total requested charge / discharge current after the increase, and the process returns to step S3;

[0036] Otherwise, maintain the current total requested charge / discharge current and return to step S1;

[0037] Where ΔI2=I 总 *X2-ΔI, X2 is a coefficient, X2<1. Preferably, the value of X1 may be 0.5.

[0038] During the adjustment process, if the increased total requested charge / discharge current is greater than the corresponding total charge / discharge current allowable value of the battery system in the current state, the current total requested charge / discharge current is adjusted to the corresponding total charge / discharge current allowable value of the battery system in the current state.

[0039] During the adjustment process, if the total requested charge / discharge current after the reduction is lower than half of the total charge / discharge current allowable value corresponding to the battery system in the current state, and there is still a branch overcurrent fault, the overcurrent fault is reported and charging / discharging is stopped.

[0040] It should be noted that the total charge / discharge current allowable value I of the battery system obtained according to the current state of the battery system is 总 In the example, the current state includes the current temperature and SOC of the battery, which are obtained by looking up a table (SOP table). The SOP table is shown in Table 1.

[0041] Table 1 Battery system ground charging BMS demand current (C)

[0042]

[0043]

[0044] ​In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0045] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those expressly recited in each claim. Rather, as reflected in the claims, inventive aspects lie in less than all of the features of the individual embodiments previously disclosed. Therefore, the claims that follow the detailed description are hereby expressly incorporated into the detailed description, with each claim itself serving as a separate embodiment of the present invention.

[0046] Those skilled in the art will appreciate that the modules or units or groups of the devices in the examples disclosed herein may be arranged in the device as described in the embodiment, or alternatively may be located in one or more devices different from the devices in the example. The modules in the foregoing examples may be combined into one module or may be divided into multiple submodules.

[0047] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or groups in the embodiments may be combined into one module or unit or group, and in addition they may be divided into a plurality of submodules or subunits or subgroups. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0048] Furthermore, those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features from different embodiments is meant to be within the scope of the present invention and to form different embodiments.

[0049] In addition, some of the embodiments are described herein as methods or combinations of method elements that can be implemented by a processor of a computer system or by other devices that perform the functions. Therefore, a processor with necessary instructions for implementing the method or method elements forms a device for implementing the method or method elements. In addition, the elements described herein of the device embodiments are examples of devices for implementing the functions performed by the elements for the purpose of implementing the invention.

[0050] The various techniques described herein may be implemented in combination with hardware or software, or a combination thereof. Thus, the method and apparatus of the present invention, or some aspects or portions of the method and apparatus of the present invention may be in the form of program codes (i.e., instructions) embedded in a tangible medium, such as a floppy disk, a CD-ROM, a hard disk drive, or any other machine-readable storage medium, wherein when the program is loaded into a machine such as a computer and executed by the machine, the machine becomes a device for practicing the present invention.

[0051] In the case where the program code is executed on a programmable computer, the computing device generally includes a processor, a storage medium readable by the processor (including volatile and non-volatile memory and / or storage elements), at least one input device, and at least one output device. The memory is configured to store the program code; the processor is configured to execute the method of the present invention according to the instructions in the program code stored in the memory.

[0052] By way of example and not limitation, computer readable media include computer storage media and communication media. Computer readable media include computer storage media and communication media. Computer storage media stores information such as computer readable instructions, data structures, program modules or other data. Communication media generally embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and includes any information delivery medium. Any combination of the above is also included within the scope of computer readable media.

[0053] As used herein, unless otherwise specified, the use of ordinal numbers "first," "second," "third," etc. to describe common objects merely indicates that different instances of similar objects are involved, and is not intended to imply that the objects so described must have a given order in time, space, order, or in any other manner.

[0054] Although the present invention has been described according to a limited number of embodiments, it will be apparent to those skilled in the art, with the benefit of the above description, that other embodiments may be envisioned within the scope of the invention thus described. In addition, it should be noted that the language used in this specification is selected primarily for readability and teaching purposes, rather than for explaining or defining the subject matter of the present invention. Therefore, many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is illustrative, not restrictive, with respect to the scope of the present invention, which is defined by the appended claims.

[0055] Finally, it should be noted that the present invention does not explain in detail the common knowledge recognized by technicians in this field. The above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for regulating charging and discharging current of a multi-branch power battery, characterized in that: The method comprises the following steps: S1. Determine whether the actual value I of the charging / discharging current of each branch meets the following conditions: I>I lim ; If there is a branch that meets the conditions, it is judged as a branch overcurrent fault and proceeds to the next step; in, N is the number of branches, X1 is the coefficient, X1>1; I 总 is the total allowable charge / discharge current of the battery system, obtained according to the current state of the battery system; S2, reduce the total requested charge / discharge current by ΔI1; where ΔI1=II lim ; will I 总 The value of is updated to the total requested charge / discharge current after the adjustment, and the next step is entered; S3, determine whether the actual value I of the current charging / discharging current of each branch meets the following conditions: I>I lim ; If there is a branch that meets the conditions, it is determined to be a branch overcurrent fault, and the process returns to step S2; Otherwise proceed to the next step; S4, determine whether the maximum difference ΔI of the actual value of the charging / discharging current of each branch meets the following conditions: ΔI 总 *X2;​ If the conditions are met, the total requested charge / discharge current is increased by ΔI2, and I 总 The value of is updated to the total requested charge / discharge current after the increase, and the process returns to step S3; Otherwise, maintain the current total requested charge / discharge current; Where ΔI2=I 总 *X2-ΔI, X2 is the coefficient, X2<1.

2. The multi-branch power battery charge and discharge current regulation method according to claim 1, characterized in that: If the increased total requested charge / discharge current is greater than the total charge / discharge current allowable value corresponding to the current state of the battery system, the current total requested charge / discharge current is adjusted to the total charge / discharge current allowable value corresponding to the current state of the battery system.

3. The multi-branch power battery charge and discharge current regulation method according to claim 1 or 2, characterized in that: If the total requested charge / discharge current after the reduction is lower than half of the corresponding total charge / discharge current allowable value of the battery system in the current state, and there is still a branch overcurrent fault, the overcurrent fault is reported and charging / discharging is stopped.

4. The multi-branch power battery charge and discharge current regulation method according to claim 1 or 2, characterized in that: In step S1, if the current actual value I of the charge / discharge current of each branch does not meet the corresponding condition, the current total requested charge / discharge current is maintained and it is continuously determined whether the current actual value I of the charge / discharge current of each branch meets the corresponding condition.

5. The multi-branch power battery charge and discharge current regulation method according to claim 1 or 2, characterized in that: In step S4, if the maximum difference ΔI of the actual values ​​of the charge / discharge currents of the branches does not meet the corresponding conditions, the current total requested charge / discharge current is maintained and the process returns to step S1.

6. A multi-branch power battery charge and discharge current regulating device, comprising a memory, a processor and a computer program stored in the memory, characterized in that: The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 5.

7. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

8. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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