A method, apparatus, and vehicle for estimating the state of charge (SOC) of a parallel battery system.

Abstract

The present application provides a method, device and vehicle for estimating the SOC of a parallel battery system, which belongs to the field of battery technology. The method includes: determining the actual SOC values ​​corresponding to each of the multiple battery packs based on the maximum SOC value and the minimum SOC value of each of the multiple battery packs; determining the real SOC value of the parallel battery system according to the actual SOC values ​​corresponding to each of the multiple battery packs, wherein the real SOC value is the SOC value displayed on the instrument. The embodiment of the present application can fully consider the charging state of each battery pack during the charging of multiple battery packs, and thus more accurately estimate the real SOC of the parallel battery system, while effectively avoiding the problem that the charging pile stops running when one of the battery packs is fully charged, and can charge as many battery packs as possible to improve the charging effect of the whole vehicle and the user experience.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a SOC estimation method, device and vehicle for a parallel battery system. Background Art

[0002] In the battery management system, the battery state of charge (SOC) is a very important battery parameter. SOC represents the percentage of the remaining available power of the battery to the total capacity, and is used to measure the remaining available capacity of the battery pack. Accurate SOC estimation provides an important reference for the battery safety management, charge and discharge control, and vehicle energy management of electric vehicles.

[0003] At present, the main method for estimating SOC is the ampere-hour integration method. When charging, the maximum SOC value in the battery pack is used as the true SOC value of the entire pack level, and this value is sent to the charging pile and the user. When the maximum SOC reaches the charging cut-off voltage, the true SOC value is displayed as 100%, and the charging pile will stop charging.

[0004] However, existing SOC estimation methods often have the following problems when facing parallel battery systems: the maximum SOC value of multiple parallel battery packs cannot accurately represent the SOC value of the entire pack. If the maximum SOC value is directly used as the actual SOC value of the entire pack, not only will there be a large error between the estimated value and the actual value, but when one of the battery packs is fully charged, the actual SOC value will be displayed as 100%, and the charging pile will stop running, resulting in poor charging effect, which will ultimately affect the vehicle's range and the user's driving experience. Summary of the invention

[0005] The present application provides a SOC estimation method, device and vehicle for a parallel battery system, which can accurately estimate the actual SOC of the parallel battery system during the charging process of the parallel battery system and improve the charging effect of the entire vehicle.

[0006] In order to solve the above problems, this application adopts the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a method for estimating the SOC of a parallel battery system, wherein the parallel battery system includes a plurality of battery packs connected in parallel, and the method includes:

[0008] In a process of charging the plurality of battery packs, determining actual SOC values ​​corresponding to the plurality of battery packs based on respective maximum SOC values ​​and minimum SOC values ​​of the plurality of battery packs;

[0009] The real SOC value of the parallel battery system is determined according to the actual SOC values ​​corresponding to each of the multiple battery packs; wherein the real SOC value is the SOC value displayed on the instrument.

[0010] In an embodiment of the present application, based on the maximum SOC value and the minimum SOC value of each of the multiple battery packs, determining the actual SOC value corresponding to each of the multiple battery packs includes:

[0011] For each of the battery packs, a maximum SOC value and a minimum SOC value of the battery pack are weightedly calculated to obtain an actual SOC value corresponding to the battery pack.

[0012] In an embodiment of the present application, determining the real SOC value of the parallel battery system according to the actual SOC values ​​corresponding to each of the plurality of battery packs includes:

[0013] A weighted calculation is performed on the actual SOC values ​​corresponding to each of the multiple battery packs to obtain a true SOC value of the parallel battery system.

[0014] In an embodiment of the present application, the method further includes:

[0015] Detecting whether there is a first target battery pack among the multiple battery packs, where the first target battery pack is a fully charged battery pack;

[0016] If the first target battery pack exists, quit charging the first target battery pack, keep charging the remaining battery packs other than the first target battery pack, set the actual SOC value to the preset SOC value and then display it on the instrument;

[0017] While keeping the remaining battery packs charged, repeat the above steps until the actual SOC value of the second target battery pack is greater than the preset SOC value, and then display the actual SOC value of the second target battery pack in real time on the instrument; wherein the second target battery pack is the last battery pack among the remaining battery packs that is not fully charged.

[0018] In an embodiment of the present application, the actual SOC value of the second target battery pack is obtained by weighted calculation of the maximum SOC value and the minimum SOC value of the second target battery.

[0019] In an embodiment of the present application, before quitting charging the first target battery pack, the method further includes:

[0020] The current charging current of the parallel battery system is reduced to a preset current value.

[0021] In an embodiment of the present application, after quitting charging the first target battery pack, the method further includes:

[0022] Determining target current values ​​of the remaining battery packs according to the maximum value of the actual SOC values ​​of the remaining battery packs;

[0023] The current charging current of the parallel battery system is increased from the preset current value to the target current value, and the remaining battery packs are charged according to the target current value.

[0024] In a second aspect, based on the same inventive concept, an embodiment of the present application provides a SOC estimation device for a parallel battery system, the device is applied to the parallel battery system, the parallel battery system includes a plurality of battery packs connected in parallel, and the device includes:

[0025] an actual SOC value determination module, configured to determine, during the process of charging the multiple battery packs, actual SOC values ​​corresponding to the multiple battery packs based on the respective maximum SOC values ​​and minimum SOC values ​​of the multiple battery packs;

[0026] The real SOC value determination module is used to determine the real SOC value of the parallel battery system according to the actual SOC values ​​corresponding to each of the multiple battery packs; wherein the real SOC value is the SOC value displayed on the instrument.

[0027] In one embodiment of the present application, the actual SOC value determination module includes:

[0028] The first calculation submodule is used to perform weighted calculation on the maximum SOC value and the minimum SOC value of each battery pack to obtain an actual SOC value corresponding to the battery pack.

[0029] In one embodiment of the present application, the real SOC value determination module includes:

[0030] The second calculation submodule is used to perform weighted calculation on the actual SOC values ​​corresponding to each of the multiple battery packs to obtain a true SOC value of the parallel battery system.

[0031] In one embodiment of the present application, the SOC estimation device of the parallel battery system further includes:

[0032] A power detection module, used for detecting whether there is a first target battery pack among the multiple battery packs, where the first target battery pack is a fully charged battery pack;

[0033] a continuous charging module, configured to, when the first target battery pack exists, quit charging the first target battery pack, keep charging the remaining battery packs other than the first target battery pack, and set the actual SOC value to a preset SOC value and then display it on the instrument;

[0034] A real-time display module is used to repeat the above steps while maintaining the charging of the remaining battery packs until the actual SOC value of the second target battery pack is greater than the preset SOC value, and to display the actual SOC value of the second target battery pack on the instrument in real time; wherein the second target battery pack is the last battery pack among the remaining battery packs that is not fully charged.

[0035] In an embodiment of the present application, the actual SOC value of the second target battery pack is obtained by weighted calculation of the maximum SOC value and the minimum SOC value of the second target battery.

[0036] In one embodiment of the present application, the SOC estimation device of the parallel battery system further includes:

[0037] The current reduction module is used to reduce the current charging current of the parallel battery system to a preset current value before quitting charging the first target battery pack.

[0038] In one embodiment of the present application, the SOC estimation device of the parallel battery system further includes:

[0039] a target current value determination module, configured to determine target current values ​​of the remaining battery packs according to the maximum value of the actual SOC values ​​of the remaining battery packs after quitting charging the first target battery pack;

[0040] A current boost module is used to increase the current charging current of the parallel battery system from the preset current value to the target current value, and to charge the remaining battery packs according to the target current value.

[0041] In the third aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle, comprising a memory and a processor, wherein the memory is used to store a charging processing program of a parallel battery system; and the processor is used to execute the charging processing program of the parallel battery system to implement the SOC estimation method of the parallel battery system as described in the first aspect of the present application.

[0042] Compared with the prior art, this application has the following advantages:

[0043] In an embodiment of the present application, a SOC estimation method for a parallel battery system first determines the actual SOC values ​​corresponding to each of the multiple battery packs based on the maximum SOC value and the minimum SOC value of each of the multiple battery packs during the charging process of the multiple battery packs; and then determines the real SOC value of the parallel battery system based on the actual SOC values ​​corresponding to each of the multiple battery packs. In the process of charging the multiple battery packs, the embodiment of the present application can fully consider the charging state of each battery pack, and can more accurately estimate the real SOC of the parallel battery system, while avoiding the problem that the charging pile stops running when one of the battery packs is fully charged, and charges as many battery packs as possible to improve the charging effect of the whole vehicle and the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 is a flowchart of the steps of a method for estimating the SOC of a parallel battery system in one embodiment of the present application;

[0046] Figure 2 is a flowchart of the steps of a method for estimating the SOC of a parallel battery system in another embodiment of the present application;

[0047] Figure 3 It is a functional module diagram of a SOC estimation device for a parallel battery system in one embodiment of the present application.

[0048] Figure numerals: 200 - SOC estimation device for parallel battery system; 201 - actual SOC value determination module; 202 - real SOC value determination module; 203 - power detection module; 204 - continuous charging module; 205 - real-time display module. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Reference Figure 1, shows a SOC estimation method of a parallel battery system of the present application, the parallel battery system includes a plurality of battery packs connected in parallel, and the method may include the following steps:

[0051] S101: In a process of charging a plurality of battery packs, determining actual SOC values ​​corresponding to the plurality of battery packs based on respective maximum SOC values ​​and minimum SOC values ​​of the plurality of battery packs.

[0052] It should be noted that the SOC (State of Charge) is used to reflect the remaining capacity of the battery. Its value is defined as the ratio of the remaining capacity to the battery capacity, usually expressed as a percentage. Its value range is 0 to 1. When SOC = 0, it means that the battery is fully discharged, and when SOC = 1, it means that the battery is fully charged.

[0053] In this embodiment, each battery pack generally includes multiple cells. During the actual charging process, the SOC values ​​of different cells in the same battery pack may differ to a certain extent, that is, the same battery pack has a maximum SOC value and a minimum SOC value. Specifically, for any battery pack, the voltage values ​​of all the single cells in the battery pack are obtained, and the single cells are sorted from large to small according to their voltage values, and the two single cells with the largest and smallest voltage values ​​are selected, and the SOC value corresponding to the single cell with the maximum voltage is used as the maximum SOC value of the battery pack, and the SOC value corresponding to the single cell with the minimum voltage is used as the minimum SOC value of the battery pack.

[0054] In this embodiment, for each battery pack, a weighted calculation can be performed based on the maximum SOC value and the minimum SOC value of the battery pack to obtain the actual SOC value corresponding to the battery pack. Through weighted calculation, compared with directly taking the maximum SOC value of the battery pack or taking the average of the maximum SOC value and the minimum SOC value as the actual SOC value of the battery pack, the calculation result can be made more real and reliable. Specifically, when performing weighted calculation, a higher weight can be assigned to the maximum SOC value and a lower weight can be assigned to the minimum SOC value. In other words, the larger the maximum SOC value, the closer the result of the weighted calculation will be to the maximum SOC value. In this way, the battery can be effectively prevented from being overcharged, and the battery can be effectively protected while meeting the charging needs of the battery.

[0055] S102: Determine a real SOC value of the parallel battery system according to actual SOC values ​​corresponding to each of the plurality of battery packs; wherein the real SOC value is the SOC value displayed on the instrument.

[0056] In this embodiment, the actual SOC values ​​corresponding to each of the multiple battery packs can be weighted to obtain the real SOC value of the parallel battery system. Specifically, when performing weighted calculation, the actual SOC values ​​corresponding to each of the multiple battery packs can be sorted, and different weights can be assigned according to the size of the actual SOC values. The larger the actual SOC value of the battery pack, the greater the weight assigned. In this way, the calculation result of the real SOC value will be closer to the larger actual SOC value among the multiple battery packs.

[0057] It should be noted that in this embodiment, the real SOC value is the SOC value sent to the charging pile and the instrument, wherein the instrument can be an on-board display screen or a pre-configured user terminal to prompt the current charging status of the vehicle battery; the charging pile controls the charging of the parallel battery system according to the real SOC value. When the real SOC value received by the charging pile is 1, it will stop charging the vehicle.

[0058] In this embodiment, since the maximum SOC value in the battery pack is not directly used as the true SOC value of the entire parallel battery system, when one of the battery packs is fully charged, the true SOC value of the parallel battery system will not be directly displayed as 1, and the charging pile will not stop charging, but will continue to charge the uncharged battery packs in the parallel battery system. In this way, as many battery packs as possible can be charged, ensuring the stability of the power performance during user use, and improving the vehicle's range and the user's driving experience.

[0059] In one possible implementation, refer to Figure 2 To further improve the charging effect of the parallel battery system, the SOC estimation method of the parallel battery system may further include the following steps:

[0060] S103: Detect whether a first target battery pack exists among the multiple battery packs, where the first target battery pack is a fully charged battery pack.

[0061] In this embodiment, the voltage value or actual SOC value at both ends of each battery pack can be detected to determine whether the battery pack is fully charged. When the voltage value at both ends of the battery pack reaches the preset cut-off voltage, or the actual SOC value of the battery pack reaches 1, it means that the battery pack is a fully charged first target battery pack, and the charging of the first target battery pack can be disconnected.

[0062] S104: If the first target battery pack exists, then quit charging the first target battery pack, and keep charging the remaining battery packs except the first target battery pack, and set the actual SOC value to the preset SOC value and then display it on the instrument.

[0063] In this embodiment, considering that the existing SOC estimation method will use the maximum SOC in the battery pack as the true SOC value of the whole pack level, when there is a fully charged battery pack, the true SOC value will be displayed as 1. After the charging pile obtains the information that the true SOC value is 1, it will stop charging the battery pack. In order to avoid stopping charging when there are still battery packs that are not fully charged, after exiting the charging of the first target battery pack, the true SOC value will be set to the preset SOC value and displayed on the instrument, so that the charging pile can continue to charge the remaining uncharged battery packs. Among them, the preset SOC value can be set to 99%.

[0064] It should be noted that in this embodiment, multiple preset SOC values ​​can be set according to the actual charging conditions of the parallel charging system, and this embodiment does not impose specific restrictions on the size and number of the preset SOC values.

[0065] For example, the preset SOC value can be adjusted in real time according to the number of fully charged charging packs. For example, for a parallel charging system with three battery packs in parallel, when the first fully charged battery pack appears, the preset SOC value can be set to a lower value, such as 98%. When the second fully charged battery pack appears, the preset SOC value can be adjusted to 99% and displayed on the instrument. In this way, the user can observe the changes in the battery charging status and experience a more realistic charging experience.

[0066] S105: While charging the remaining battery packs, repeat the above steps until the actual SOC value of the second target battery pack is greater than the preset SOC value, and then display the actual SOC value of the second target battery pack on the instrument in real time; wherein the second target battery pack is the last battery pack among the remaining battery packs that is not fully charged.

[0067] It should be noted that in this embodiment, while the remaining battery packs are being charged, repeating the above steps means repeating the above steps S103-S104, that is, whenever a fully charged first target battery pack appears, the charging of the first target battery pack will be stopped, and the charging of the remaining battery packs will be maintained until only the last battery pack that is not fully charged is left, and this battery pack is used as the second target battery pack. In addition, it should be noted that the steps S101-S102 are also a process that is continuously updated with charging. Specifically, the actual SOC values ​​corresponding to each of the multiple battery packs can be detected and calculated at a preset frequency, and the actual SOC value of the parallel battery system can be calculated and updated based on the actual SOC values ​​corresponding to each of the multiple battery packs, so that the user can observe the charging status of the parallel battery system in real time.

[0068] In this embodiment, when the actual SOC value of the second target battery pack is less than or equal to the preset SOC value, the preset SOC value will be maintained unchanged and the preset SOC value will continue to be displayed on the instrument; when the actual SOC value of the second target battery pack is greater than the preset SOC value, since the second target battery pack is the last battery pack that is not fully charged, the actual SOC value of the second target battery pack can represent the true SOC value of the entire battery pack, so the actual SOC value of the second target battery pack is displayed in real time on the instrument, and when the actual SOC value of the second target battery pack reaches 1, it indicates that all battery packs are fully charged.

[0069] It should be noted that the actual SOC value of the second target battery pack is obtained by weighted calculation of the maximum SOC value and the minimum SOC value of the second target battery. Specifically, a higher weight can be assigned to the maximum SOC value of the second target battery, and a lower weight can be assigned to the minimum SOC value of the second target battery, so that the actual SOC value of the second target battery pack obtained by weighted calculation will be closer to the maximum SOC value. In this way, the overcharging phenomenon of the second target battery pack can be effectively avoided, and the battery can be effectively protected.

[0070] In one example, the preset SOC value can be set to 99%. The parallel battery system includes a battery pack B1 and a battery pack B2 in parallel. During the charging process of the parallel battery system, the actual SOC values ​​of the battery packs B1 and B2 continue to increase, and accordingly, the real SOC value of the parallel battery system also continues to increase. When the actual SOC value of the battery pack B1 reaches 1, the actual SOC value of the battery pack B2 is only 98%. At this time, the charging of the battery pack B1 is exited. When the actual SOC value of the battery pack B2 is less than 99%, the real SOC value is always displayed as the preset SOC value, i.e., 99%. As the battery pack B2 continues to be charged, the actual SOC value of the battery pack B2 exceeds 99%. At this time, the actual SOC value of the battery pack B2 will be displayed as the real SOC value in the instrument until the SOC value displayed on the instrument is 1, then the charging of the battery packs B1 and B2 is completed, and the charging pile automatically stops charging the vehicle. In this way, more power is charged to the low-power battery pack B2 by a single-pack charging method, and finally both battery packs are fully charged.

[0071] The embodiment of the present application can continue to charge the battery packs that are not fully charged when some charging packs in the parallel battery system are fully charged, charge more power into the battery packs with low power, reduce the SOC difference between multiple battery packs, and at the same time reduce the pressure difference between multiple battery packs, thereby ensuring the stability of power performance during user use and improving the cruising range of the entire vehicle and the user's driving experience.

[0072] In a feasible implementation manner, before quitting charging the first target battery pack, the method may further include the following steps:

[0073] S106: reducing the current charging current of the parallel battery system to a preset current value.

[0074] In this embodiment, considering that the charging current of the parallel battery system is relatively large before quitting charging the first target battery pack, if the charging of the first target battery pack is directly quit and the current charging current is kept unchanged, it may cause damage to the remaining charging packs. Therefore, before the fully charged first target battery pack quits charging, the current charging current of the parallel battery system is reduced to a lower preset current value, thereby ensuring that the remaining charging packs will not have overcurrent, thereby improving charging safety.

[0075] In a feasible implementation manner, after quitting charging the first target battery pack, the method may further include the following steps:

[0076] S107: Determine target current values ​​of the remaining battery packs according to the maximum value of the actual SOC values ​​of the remaining battery packs.

[0077] S108: Increase the current charging current of the parallel battery system from a preset current value to a target current value, and charge the remaining battery packs according to the target current value.

[0078] In this embodiment, considering that the preset current value is low, if the preset current value is maintained to charge the remaining charging packs that are not fully charged, the charging efficiency is low. Therefore, after the charging of the first target battery pack is exited, the target current values ​​of the remaining battery packs will be determined according to the maximum value of the actual SOC values ​​of the remaining battery packs. Specifically, the actual SOC values ​​of the remaining charging packs are calculated in step S101, and the actual SOC values ​​are sorted from large to small, and the maximum value is taken as the maximum actual SOC value, and then the target current values ​​of the remaining battery packs are determined according to the maximum actual SOC value.

[0079] It should be noted that in this embodiment, the larger the maximum value of the actual SOC values ​​of the remaining battery packs, the more power the remaining battery packs have been charged, and the smaller the required target current value. Therefore, using the maximum value of the actual SOC values ​​of the remaining battery packs as a reference can not only improve charging efficiency and shorten charging time, but also ensure charging safety of the remaining battery packs and avoid overcurrent.

[0080] In this embodiment, when determining the target current values ​​of the remaining battery packs, the current charging temperature of the battery can also be combined so that the target current value can further meet the current operating conditions of the battery. Specifically, a target current value index table can be established, in which different battery temperatures and different maximum actual SOC values ​​correspond to different target current values. In specific applications, the real-time charging temperature of the battery can be obtained by a temperature sensor provided on the battery, and the maximum actual SOC value can be determined based on the maximum value of the actual SOC values ​​of the remaining battery packs that are not fully charged; finally, the target current value that meets the current operating conditions of the battery is determined based on the real-time charging temperature and the maximum actual SOC value. In this way, suitable target current values ​​can be assigned to the remaining battery packs according to different maximum actual SOC values ​​and different charging temperatures at different charging stages of the parallel battery system.

[0081] In the second aspect, based on the same inventive concept, refer to Figure 3 , shows an SOC estimation device 200 for a parallel battery system provided in an embodiment of the present application, the SOC estimation device 200 for a parallel battery system is applied to a parallel battery system, wherein the parallel battery system includes a plurality of battery packs connected in parallel, and the SOC estimation device 200 for the parallel battery system includes:

[0082] The actual SOC value determination module 201 is used to determine the actual SOC value corresponding to each of the multiple battery packs based on the maximum SOC value and the minimum SOC value of each of the multiple battery packs during the charging process of the multiple battery packs.

[0083] The real SOC value determination module 202 is used to determine the real SOC value of the parallel battery system according to the actual SOC values ​​corresponding to each of the multiple battery packs; wherein the real SOC value is the SOC value displayed on the instrument.

[0084] In a feasible implementation manner, the actual SOC value determination module 201 includes:

[0085] The first calculation submodule is used to perform weighted calculation on the maximum SOC value and the minimum SOC value of each battery pack to obtain an actual SOC value corresponding to the battery pack.

[0086] In a feasible implementation manner, the real SOC value determination module 202 includes:

[0087] The second calculation submodule is used to perform weighted calculation on the actual SOC values ​​corresponding to each of the multiple battery packs to obtain the real SOC value of the parallel battery system.

[0088] In one possible implementation, continue to refer to Figure 2 , the SOC estimation device 200 of the parallel battery system may further include:

[0089] A power detection module 203, used to detect whether there is a first target battery pack among the multiple battery packs, where the first target battery pack is a fully charged battery pack;

[0090] The continuous charging module 204 is used to quit charging the first target battery pack when there is a first target battery pack, and keep charging the remaining battery packs except the first target battery pack, and set the actual SOC value to the preset SOC value and then display it on the instrument.

[0091] The real-time display module 205 is used to repeat the above steps while keeping the remaining battery packs charged until the actual SOC value of the second target battery pack is greater than the preset SOC value, and display the actual SOC value of the second target battery pack on the instrument in real time; wherein the second target battery pack is the last battery pack among the remaining battery packs that is not fully charged.

[0092] In a feasible implementation manner, the actual SOC value of the second target battery pack is obtained by weighted calculation of the maximum SOC value and the minimum SOC value of the second target battery.

[0093] In a feasible implementation manner, the SOC estimation device 200 of the parallel battery system further includes:

[0094] The current reduction module is used to reduce the current charging current of the parallel battery system to a preset current value before quitting charging the first target battery pack.

[0095] In a feasible implementation manner, the SOC estimation device 200 of the parallel battery system further includes:

[0096] a target current value determination module, configured to determine target current values ​​of the remaining battery packs according to the maximum value of the actual SOC values ​​of the remaining battery packs after quitting charging the first target battery pack;

[0097] The current boost module is used to increase the current charging current of the parallel battery system from a preset current value to a target current value, and to charge the remaining battery packs according to the target current value.

[0098] It should be noted that the specific implementation of the SOC estimation device 200 for the parallel battery system of the embodiment of the present application refers to the specific implementation of the SOC estimation method for the parallel battery system proposed in the first aspect of the embodiment of the present application, which will not be repeated here.

[0099] On the third aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle, the vehicle including a memory and a processor, the memory being used to store a charging processing program of a parallel battery system; the processor being used to execute the charging processing program of the parallel battery system to implement the SOC estimation method of the parallel battery system as in the first aspect of the present application.

[0100] It should be noted that the specific implementation of the vehicle in the embodiment of the present application refers to the specific implementation of the SOC estimation method for the parallel battery system proposed in the first aspect of the embodiment of the present application, which will not be repeated here.

[0101] It will be appreciated by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0102] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0103] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0104] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable terminal device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0105] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0106] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0107] The SOC estimation method, device and vehicle of a parallel battery system provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for estimating SOC of a parallel battery system, characterized in that: The parallel battery system includes a plurality of battery packs connected in parallel, and the method includes: In a process of charging the plurality of battery packs, determining actual SOC values ​​corresponding to the plurality of battery packs based on respective maximum SOC values ​​and minimum SOC values ​​of the plurality of battery packs; Determine the real SOC value of the parallel battery system according to the actual SOC values ​​corresponding to each of the multiple battery packs; wherein the real SOC value is the SOC value displayed on the instrument; The method further comprises: Detecting whether there is a first target battery pack among the multiple battery packs, where the first target battery pack is a fully charged battery pack; If the first target battery pack exists, quit charging the first target battery pack, keep charging the remaining battery packs other than the first target battery pack, set the actual SOC value to the preset SOC value and then display it on the instrument; While keeping the remaining battery packs charged, repeat the above steps until the actual SOC value of the second target battery pack is greater than the preset SOC value, and then display the actual SOC value of the second target battery pack in real time on the instrument; wherein the second target battery pack is the last battery pack among the remaining battery packs that is not fully charged.

2. The method according to claim 1, characterized in that: Based on the maximum SOC value and the minimum SOC value of each of the multiple battery packs, determining the actual SOC value corresponding to each of the multiple battery packs, including: For each of the battery packs, a maximum SOC value and a minimum SOC value of the battery pack are weightedly calculated to obtain an actual SOC value corresponding to the battery pack.

3. The method according to claim 1, characterized in that Determining a true SOC value of the parallel battery system according to actual SOC values ​​corresponding to each of the plurality of battery packs includes: A weighted calculation is performed on the actual SOC values ​​corresponding to each of the multiple battery packs to obtain a true SOC value of the parallel battery system.

4. The method according to claim 1, characterized in that: The actual SOC value of the second target battery pack is obtained by weighted calculation of the maximum SOC value and the minimum SOC value of the second target battery.

5. The method according to claim 1, characterized in that: Before quitting charging the first target battery pack, the method further includes: The current charging current of the parallel battery system is reduced to a preset current value.

6. The method according to claim 5, characterized in that After quitting charging the first target battery pack, the method further includes: Determining target current values ​​of the remaining battery packs according to the maximum value of the actual SOC values ​​of the remaining battery packs; The current charging current of the parallel battery system is increased from the preset current value to the target current value, and the remaining battery packs are charged according to the target current value.

7. A SOC estimation device for a parallel battery system, characterized in that: The device is applied to the parallel battery system, which includes a plurality of battery packs connected in parallel. The device includes: an actual SOC value determination module, configured to determine, during the process of charging the multiple battery packs, actual SOC values ​​corresponding to the multiple battery packs based on the respective maximum SOC values ​​and minimum SOC values ​​of the multiple battery packs; A real SOC value determination module, used to determine the real SOC value of the parallel battery system according to the actual SOC values ​​corresponding to each of the multiple battery packs; wherein the real SOC value is the SOC value displayed on the instrument; The SOC estimation device further includes: A power detection module, used for detecting whether there is a first target battery pack among the multiple battery packs, where the first target battery pack is a fully charged battery pack; a continuous charging module, configured to quit charging the first target battery pack if the first target battery pack exists, and keep charging the remaining battery packs other than the first target battery pack, and set the actual SOC value to a preset SOC value and then display it on the instrument; A real-time display module is used to repeat the above steps while maintaining the charging of the remaining battery packs until the actual SOC value of the second target battery pack is greater than the preset SOC value, and then display the actual SOC value of the second target battery pack in real time on the instrument; wherein the second target battery pack is the last battery pack among the remaining battery packs that is not fully charged.

8. The device according to claim 7, characterized in that The actual SOC value determination module includes: The first calculation submodule is used to perform weighted calculation on the maximum SOC value and the minimum SOC value of each battery pack to obtain an actual SOC value corresponding to the battery pack.

9. A vehicle, characterized in that: The vehicle includes a memory and a processor, wherein the memory is used to store a charging processing program for a parallel battery system; and the processor is used to execute the charging processing program for the parallel battery system to implement the method described in any one of claims 1-6.

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