Balancing control method and system of power battery, terminal and storage medium

Abstract

The invention discloses an equalization control method and system for a power battery, a terminal and a storage medium, and belongs to the technical field of power batteries, and the method comprises the steps: 1, obtaining the depolarization OCV recognition basic data of a vehicle end battery; 2, calculating the depolarization time of the battery based on the complete vehicle end battery depolarization OCV identification basic data; 3, the depolarization time deviation degree between the batteries is calculated; and step 4, determining an equalization target battery based on the battery depolarization deviation degree. According to the method, the online big data platform monitors the depolarization time between different batteries after discharging is finished, if the deviation degree of the depolarization time of the batteries is larger than 5 min under the same dimension, the target balanced battery is locked, and the target balanced battery is remotely and actively started to be balanced in a dormancy awakening mode through the big data platform. According to the method, the battery capacity can be utilized to the maximum extent, the endurance mileage of the electric vehicle is increased, and the service life of the battery is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of power batteries, and in particular relates to a power battery balancing control method, system, terminal and storage medium. Background Art

[0002] With the rapid development of new energy vehicles, the accurate operation status of lithium batteries is an important basis for the safety of electric vehicles. However, the complexity of lithium battery usage scenarios and the different sensitivity of battery systems to temperature, current, and aging during use lead to certain differences in the use of batteries. In addition, the internal balancing ability of the battery system is insufficient, which affects the driving range of electric vehicles. Therefore, it is necessary to conduct relevant research on improving the balancing efficiency of electric vehicles. Summary of the invention

[0003] In view of the problem of insufficient mileage of electric vehicles due to insufficient battery balancing ability in the prior art, the present invention provides a power battery balancing control method, system, terminal and storage medium. The depolarization time between different batteries after discharge is monitored through an online big data platform. If the deviation of the battery depolarization time is greater than 5 minutes in the same dimension, the target balancing battery is locked, and the target balancing battery is remotely initiated through the big data platform, and the balancing is actively started through the sleep wake-up mode. The method of the present invention can maximize the utilization of battery capacity, improve the mileage of electric vehicles, and extend the battery life.

[0004] The present invention is achieved through the following technical solutions:

[0005] In a first aspect, the present invention provides a method for controlling a balance of a power battery, which specifically comprises the following steps:

[0006] Step 1: Obtain the basic data for vehicle-side battery depolarization OCV identification;

[0007] Step 2: Calculate the battery depolarization time based on the vehicle-side battery depolarization OCV identification basic data;

[0008] Step 3: Calculate the depolarization time deviation between batteries;

[0009] Step 4: Determine the target battery for balancing based on the battery depolarization deviation.

[0010] Furthermore, step one specifically includes the following contents:

[0011] S11, when receiving the discharge end signal, record the voltage value Volt, the maximum temperature Tmax, the minimum temperature Tmin and the actual current value Cur of all monomers when |actual current|>3A, as well as the depolarization start time T1 and the total time t when |actual current|>3A;

[0012] S12, after receiving the depolarization completion signal, record all current monomer voltages Volt, maximum temperature Tmax, minimum temperature Tmin and actual current values ​​Cur.

[0013] Furthermore, step 2 specifically includes the following contents:

[0014] S21, calculating the estimated static voltage value OCV of all monomers by the following formula;

[0015]

[0016] Among them, OCV is the estimated static voltage value, I is the actual current value, R0 is the battery ohmic internal resistance, R1 and R2 are the battery polarization internal resistance, C1 and C2 are the battery capacity, t is the discharge time, and Volt is the actual single cell voltage value;

[0017] S22, compare the estimated static voltage value OCV with the voltage value after the discharge is completed. If the estimated static voltage value OCV-10mV≥actual single cell voltage value Volt, and it is confirmed after 1 second, then turn on the depolarization completion flag and record the current battery depolarization completion time T2;

[0018] S23, calculating the total depolarization time ΔT according to the polarization start time T1 and the depolarization completion time T2, the specific formula is as follows:

[0019] ΔT = T2 - T1;

[0020] In this way, the depolarization time ΔT(i) of each single cell is calculated.

[0021] Furthermore, step three specifically includes the following contents:

[0022] S31, according to the voltage depolarization time ΔT(i) of each single cell, calculate the target depolarization time Ttarget of the single cell, the specific formula is as follows:

[0023]

[0024] Where, Ttarget is the target depolarization time, ΔTmax is the maximum total depolarization time, ΔTmin is the minimum total depolarization time, ΔT is the total depolarization time, and i is the battery number;

[0025] S32, calculating the battery depolarization deviation ΔQ according to the depolarization time ΔT(i) of each single battery and the depolarization target time Ttarget, the specific formula is as follows:

[0026] ΔQ=|ΔT(i)-Ttarget|

[0027] Among them, ΔQ is the battery depolarization deviation, ΔT is the depolarization time, i is the battery number, and Ttarget is the depolarization target time.

[0028] Furthermore, in step 4, if the battery depolarization deviation is greater than 5min, the target balanced battery is locked, and when the temperature difference inside the battery system is less than 3°C, the target balanced battery is balanced to 1% SOC through the big data platform.

[0029] In a second aspect, the present invention provides a power battery balancing control system, which is used to implement a power battery balancing control method according to the first aspect of the present invention, comprising:

[0030] The acquisition module is used to obtain the basic data of OCV identification of battery depolarization at the vehicle end;

[0031] The battery depolarization time calculation module is used to calculate the battery depolarization time based on the vehicle-side battery depolarization OCV identification basic data;

[0032] A battery depolarization time deviation calculation module, used to calculate the battery depolarization time deviation;

[0033] The determination module is used to determine the equalization target battery based on the battery depolarization deviation.

[0034] In a third aspect, the present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a power battery balancing control method as described in any one of the present invention is implemented.

[0035] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a power battery balancing control method as described in any one of the present inventions.

[0036] Compared with the prior art, the advantages of the present invention are as follows:

[0037] The present invention provides a method, system, terminal and storage medium for equalizing control of a power battery. The method combines the estimated OCV value of theoretical depolarization, and starts calculating the depolarization end point by estimating the OCV value, and starts identifying and collecting all battery voltage stability judgments by completing the depolarization. Thus, to determine the actual depolarization completion time, it is only necessary to calculate the depolarization completion time and the depolarization start time. The method reduces the recording of a large amount of data during the actual depolarization time, and avoids occupying a large amount of running memory. The battery capacity can be maximized, the cruising range of electric vehicles can be improved, and the battery life can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0039] Figure 1 It is a schematic flow chart of a method for controlling a power battery balance according to the present invention;

[0040] Figure 2 It is a structural block diagram of a balancing control system of a power battery of the present invention;

[0041] Figure 3 This is a schematic diagram of the structure of an electronic device in Example 3 of the present invention. DETAILED DESCRIPTION

[0042] In order to clearly and completely describe the technical solution and its specific working process of the present invention, the specific implementation methods of the present invention are as follows in conjunction with the accompanying drawings of the specification:

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0046] Example 1

[0047] The present embodiment provides a method for controlling the balancing of a power battery. First, based on the data collected, stored and monitored after the discharge is completed, the depolarization time of each battery is calculated, and the target battery to be balanced is determined according to the difference in depolarization time between the batteries. The depolarization time calculation includes two parts: theoretical depolarization OCV calculation and actual depolarization time calculation. The theoretical depolarization OCV calculation is obtained by calculating the second-order RC model, and the actual depolarization time is the time from the start of depolarization to the end of depolarization. The depolarization starting time is selected from the point where the discharge end signal is received, and the depolarization end time is selected from the point where the single cell voltage is stable. In order to reduce the actual depolarization time and record a large amount of data, resulting in a large amount of running memory occupied, this method is combined with the estimated OCV value of the theoretical depolarization. By estimating the OCV value , turn on the calculation of the depolarization end point enable, complete the depolarization enable, turn on the identification and collection of all battery voltage stability judgments, so as to determine the actual depolarization completion time, you only need to calculate the depolarization completion time and the depolarization start time; the battery depolarization target time is obtained by the average value method, calculate the depolarization time T(i) of each battery, remove the maximum Tmax and minimum Tmin depolarization time, calculate the average value of other battery depolarization batteries, as the depolarization target time, and then compare the depolarization time of each battery with the balancing target time to determine the target balanced battery, and then use the big data platform to actively intelligently sleep and wake up to quickly balance the battery differences; this method can maximize the utilization of battery capacity, improve the range of electric vehicles, and extend battery life.

[0048] Specifically, combined Figure 1 A method for controlling a power battery balance according to the present embodiment is described in detail, and specifically comprises the following steps:

[0049] Step 1: Obtain the basic data for vehicle-side battery depolarization OCV identification, including the following:

[0050] S11, when receiving the discharge end signal, record the voltage value Volt, the maximum temperature Tmax, the minimum temperature Tmin and the actual current value Cur of all monomers when |actual current|>3A, as well as the depolarization start time T1 and the total time t when |actual current|>3A;

[0051] S12, after receiving the depolarization completion signal, record all current monomer voltages Volt, maximum temperature Tmax, minimum temperature Tmin and actual current values ​​Cur.

[0052] Step 2: Calculate the battery depolarization time based on the vehicle-side battery depolarization OCV identification basic data, including the following:

[0053] S21, calculating the estimated static voltage value OCV of all monomers by the following formula;

[0054]

[0055] Among them, OCV is the estimated static voltage value, I is the actual current value, R0 is the battery ohmic internal resistance, R1 and R2 are the battery polarization internal resistance, C1 and C2 are the battery capacity, t is the discharge time, and Volt is the actual single cell voltage value;

[0056] S22, compare the estimated static voltage value OCV with the voltage value after the discharge is completed. If the estimated static voltage value OCV-10mV≥actual single cell voltage value Volt, and it is confirmed after 1 second, then turn on the depolarization completion flag and record the current battery depolarization completion time T2;

[0057] S23, calculating the total depolarization time ΔT according to the polarization start time T1 and the depolarization completion time T2, the specific formula is as follows:

[0058] ΔTT2-T1;

[0059] In this way, the depolarization time ΔT(i) of each single cell is calculated.

[0060] Step 3: Calculate the depolarization time deviation between batteries, including the following:

[0061] S31, according to the voltage depolarization time ΔT(i) of each single cell, calculate the target depolarization time Ttarget of the single cell, the specific formula is as follows:

[0062]

[0063] Where, Ttarget is the target depolarization time, ΔTmax is the maximum total depolarization time, ΔTmin is the minimum total depolarization time, ΔT is the total depolarization time, and i is the battery number;

[0064] S32, calculating the battery depolarization deviation ΔQ according to the depolarization time ΔT(i) of each single battery and the depolarization target time Ttarget, the specific formula is as follows:

[0065] ΔQ=|ΔT(i)-Ttarget|

[0066] Among them, ΔQ is the battery depolarization deviation, ΔT is the depolarization time, i is the battery number, and Ttarget is the depolarization target time.

[0067] Step 4: Determine the target battery for equalization based on the battery depolarization deviation;

[0068] If the battery depolarization deviation is greater than 5min, the target balanced battery is locked. At the same time, when the temperature difference inside the battery system is less than 3°C, the target balanced battery is balanced to 1% SOC through the big data platform.

[0069] Example 2

[0070] like Figure 2 As shown, this embodiment provides a power battery balancing control system, which is used to implement a power battery balancing control method described in Example 1, including:

[0071] The acquisition module is used to obtain the basic data of OCV identification of battery depolarization at the vehicle end;

[0072] The battery depolarization time calculation module is used to calculate the battery depolarization time based on the vehicle-side battery depolarization OCV identification basic data;

[0073] A battery depolarization time deviation calculation module, used to calculate the battery depolarization time deviation;

[0074] The determination module is used to determine the equalization target battery based on the battery depolarization deviation.

[0075] Example 3

[0076] Figure 3 This is a schematic diagram of the structure of a computer device in Example 3 of the present invention. Figure 3 A block diagram of an exemplary computer device 12 suitable for use in implementing embodiments of the present invention is shown. Figure 3 The computer device 12 shown is only an example and should not bring any limitation to the functions and scope of use of the embodiments of the present invention.

[0077] like Figure 3As shown, the computer device 12 is in the form of a general-purpose computing device. The components of the computer device 12 may include, but are not limited to: one or more processors or processing units 16, a system memory 28, and a bus 18 that connects various system components (including the system memory 28 and the processing unit 16).

[0078] Bus 18 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, a processor or a local bus using any of a variety of bus architectures. By way of example, these architectures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a Micro Channel Architecture (MAC) bus, an Enhanced ISA bus, a Video Electronics Standards Association (VESA) local bus, and a Peripheral Component Interconnect (PCI) bus.

[0079] The computer device 12 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 12, including volatile and non-volatile media, removable and non-removable media.

[0080] The system memory 28 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 30 and / or cache memory 32. The computer device 12 may further include other removable / non-removable, volatile / non-volatile computer system storage media. By way of example only, the storage system 34 may be used to read and write non-removable, non-volatile magnetic media ( Figure 3 not shown, usually called a "hard drive"). Although Figure 3 Not shown in the figure, a disk drive for reading and writing to a removable non-volatile disk (e.g., a "floppy disk"), and an optical disk drive for reading and writing to a removable non-volatile optical disk (e.g., a CD-ROM, a DVD-ROM, or other optical media) may be provided. In these cases, each drive may be connected to the bus 18 via one or more data medium interfaces. The memory 28 may include at least one program product having a set (e.g., at least one) of program modules that are configured to perform the functions of the various embodiments of the present invention.

[0081] A program / utility 40 having a set (at least one) of program modules 42 may be stored, for example, in the memory 28. Such program modules 42 include, but are not limited to, an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment. The program modules 42 generally perform the functions and / or methods of the embodiments described herein.

[0082] The computer device 12 may also communicate with one or more external devices 14 (e.g., keyboard, pointing device, display 24, etc.), may also communicate with one or more devices that enable a user to interact with the computer device 12, and / or communicate with any device that enables the computer device 12 to communicate with one or more other computing devices (e.g., network card, modem, etc.). Such communication may be performed through an input / output (I / O) interface 22. In addition, the computer device 12 in this embodiment, the display 24 does not exist as an independent individual, but is embedded in the mirror surface, and when the display surface of the display 24 is not displayed, the display surface of the display 24 and the mirror surface are visually integrated. In addition, the computer device 12 may also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN) and / or public network, such as the Internet) through a network adapter 20. As shown in the figure, the network adapter 20 communicates with other modules of the computer device 12 through a bus 18. It should be understood that although not shown in the figure, other hardware and / or software modules can be used in conjunction with the computer device 12, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0083] The processing unit 16 executes various functional applications and data processing by running programs stored in the system memory 28 , for example, implementing a power battery balancing control method provided in an embodiment of the present invention.

[0084] Example 4

[0085] Embodiment 4 of the present invention provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, a power battery balancing control method provided in all the embodiments of the present application is implemented.

[0086] Any combination of one or more computer-readable media may be used. A computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. A computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in conjunction with an instruction execution system, device, or device.

[0087] Computer-readable signal media may include a data signal propagated in baseband or as part of a carrier wave, which carries a computer-readable program code. Such propagated data signals may take a variety of forms, including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0088] Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0089] Computer program code for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0090] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for controlling the balance of a power battery, characterized in that: The specific steps include: Step 1: Obtain the basic data for vehicle-side battery depolarization OCV identification; Step 2: Calculate the battery depolarization time based on the vehicle-side battery depolarization OCV identification basic data; Step 3: Calculate the depolarization time deviation between batteries; Step 4: Determine the target battery for balancing based on the battery depolarization deviation.

2. A power battery balancing control method as claimed in claim 1, characterized in that: Step 1 specifically includes the following: S11, when receiving the discharge end signal, record the voltage value Volt, the maximum temperature Tmax, the minimum temperature Tmin and the actual current value Cur of all monomers when |actual current|>3A, as well as the depolarization start time T1 and the total time t when |actual current|>3A; S12, after receiving the depolarization completion signal, record all current monomer voltages Volt, maximum temperature Tmax, minimum temperature Tmin and actual current values ​​Cur.

3. A power battery balancing control method as claimed in claim 1, characterized in that: Step 2 specifically includes the following: S21, calculating the estimated static voltage value OCV of all monomers by the following formula; Among them, OCV is the estimated static voltage value, I is the actual current value, R0 is the battery ohmic internal resistance, R1 and R2 are the battery polarization internal resistance, C1 and C2 are the battery capacity, t is the discharge time, and Volt is the actual single cell voltage value; S22, compare the estimated static voltage value OCV with the voltage value after the discharge is completed. If the estimated static voltage value OCV-10mV ≥ the actual single cell voltage value Volt, and it is confirmed after 1 second, the depolarization completion flag is turned on and the depolarization completion time T2 of the current battery is recorded; S23, calculating the total depolarization time ΔT according to the polarization start time T1 and the depolarization completion time T2, the specific formula is as follows: ΔT = T2 - T1; In this way, the depolarization time ΔTi(i) of each single cell is calculated.

4. A power battery balancing control method as claimed in claim 1, characterized in that: Step 3 specifically includes the following: S31, according to each single cell voltage depolarization time ΔTi(i), calculate the single cell depolarization target time Ttarget, the specific formula is as follows: Wherein, Ttarget is the target depolarization time, ΔTmax is the maximum total depolarization time, ΔTmin is the minimum total depolarization time, ΔTi is the total depolarization time, and i is the battery number; S32, calculating the battery depolarization deviation ΔQ according to the depolarization time ΔTi(i) of each single battery and the depolarization target time Ttarget, the specific formula is as follows: ΔQ=|ΔT(i)-Ttarget| Among them, ΔQ is the battery depolarization deviation, ΔT is the depolarization time, i is the battery number, and Ttarget is the depolarization target time.

5. A power battery balancing control method as claimed in claim 1, characterized in that: In step 4, if the battery depolarization deviation is greater than 5min, the target balanced battery is locked. At the same time, when the temperature difference inside the battery system is less than 3°C, the target balanced battery is balanced to 1% SOC through the big data platform.

6. A power battery balancing control system, used to implement a power battery balancing control method as claimed in any one of claims 1 to 5, characterized in that: include: The acquisition module is used to obtain the basic data of OCV identification of battery depolarization at the vehicle end; The battery depolarization time calculation module is used to calculate the battery depolarization time based on the vehicle-side battery depolarization OCV identification basic data; A battery depolarization time deviation calculation module, used to calculate the battery depolarization time deviation; The determination module is used to determine the equalization target battery based on the battery depolarization deviation.

7. A computer device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, a power battery balancing control method as described in any one of claims 1 to 5 is implemented.

8. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the program is executed by a processor, a power battery balancing control method as described in any one of claims 1 to 5 is implemented.

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