Battery system, battery heating method, battery heating device, battery heating equipment and medium

Abstract

The invention provides a battery system, a battery heating method, a battery heating device, battery heating equipment and a medium, and relates to the technical field of batteries, the battery system comprises a high-voltage box and a plurality of battery boxes, each battery box comprises a heating positive port and a heating negative port, and the high-voltage box comprises a heating total positive port, a heating total negative port, a main loop negative port and a main loop positive port; the heating positive port of each battery box is connected in parallel to the heating total positive port; the heating negative port of each battery box is connected in parallel to the heating total negative port; a heating positive relay and a first fuse are connected in series between the heating total positive port and the main loop positive port; a heating negative relay and a main loop negative relay are connected in series between the heating total negative port and the main loop negative port. The battery system in the embodiment of the invention can perform heating control on the single battery box, so that the temperature difference fault between the battery cells caused by non-uniform temperature difference of the battery box is avoided, and the fault rate of the battery box is reduced.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery system and a battery heating method, device, equipment and medium. Background Art

[0002] As an important component of electric vehicles, the performance of the battery pack is greatly affected by temperature. In winter, affected by the ambient temperature, the battery pack temperature decreases, the activity of the battery pack is significantly reduced, the internal resistance and polarization voltage of the battery pack increase, the actual available capacity decreases, the discharge capacity of the battery pack decreases, the discharge platform is low, and the battery pack is more likely to reach the discharge cut-off voltage, which is manifested as a decrease in the available capacity of the battery pack and a decrease in the energy utilization efficiency of the battery pack.

[0003] Generally, when heating multiple battery packs of electric vehicle batteries, heaters connected in series are used for heating, which causes the temperature difference between the packs to gradually increase with the increase of heating time, thereby affecting the normal driving of the vehicle. Summary of the invention

[0004] In view of this, an object of the present invention is to provide a battery system and a battery heating method, which can realize individual control of the heating process of each battery box by connecting the heating positive ports of each battery box and the heating negative ports of each battery box in parallel, thereby solving the problem in the prior art that the temperature difference between battery boxes gradually increases with the increase of heating time.

[0005] In a first aspect, an embodiment of the present invention provides a battery system, the system comprising a high-voltage box and a plurality of battery boxes, the battery box comprising a heated positive port and a heated negative port, the high-voltage box comprising a heated total positive port, a heated total negative port, a main circuit negative port and a main circuit positive port;

[0006] The heating positive port of each of the battery boxes is connected in parallel to the heating total positive port;

[0007] The heating negative port of each of the battery boxes is connected in parallel to the heating total negative port;

[0008] A heating positive relay and a first fuse are connected in series between the heating total positive port and the main circuit positive port;

[0009] A heating negative relay and a main circuit negative relay are connected in series between the heating total negative port and the main circuit negative port;

[0010] The battery box further comprises a heating circuit and a communication interface, wherein the heating circuit comprises a heating resistor and a heating relay connected in series, and the communication interface is used to transmit the temperature of the battery box;

[0011] The high voltage box also includes a low voltage input interface, and the communication interfaces of the battery boxes are connected in series and connected to the low voltage input interface.

[0012] The high voltage box also includes a total battery negative port, a total battery positive port, a charging negative port and a charging positive port;

[0013] Among them, a current transformer is connected between the middle position of the heating negative relay and the main circuit negative relay and the total negative port of the battery; a charging negative relay is connected between the middle position of the heating negative relay and the main circuit negative relay and the charging negative port;

[0014] A second fuse is connected between the battery total positive port and the main circuit positive port; a charging positive relay is connected between the charging positive port and the main circuit positive port.

[0015] The battery boxes are connected in series according to a preset sequence;

[0016] According to the preset order, the battery positive port of the first battery box among the multiple battery boxes is connected to the battery total positive port, and the battery negative port of the last battery box among the multiple battery boxes is connected to the battery total negative port.

[0017] The communication interface of the battery box includes a first communication interface and a second communication interface;

[0018] The second communication interface of the first battery box among the multiple battery boxes is connected to the first communication interface of the second battery box among the multiple battery boxes; the first battery box and the second battery box are two adjacent battery boxes among the multiple battery boxes, and according to the preset order, the first battery box is before the second battery box;

[0019] The second communication interface of the last battery box is connected to the low voltage input interface.

[0020] In a second aspect, an embodiment of the present invention further provides a battery heating method, comprising:

[0021] Acquire a first temperature corresponding to each of the battery boxes; wherein the number of the first temperatures is the same as the number of the battery boxes;

[0022] When the difference between the highest temperature and the lowest temperature among the first temperatures is greater than a first threshold, disconnecting the heating relay in the battery box corresponding to the highest temperature, and obtaining the second temperatures corresponding to the battery boxes other than the battery box corresponding to the highest temperature;

[0023] When each of the second temperatures is greater than or equal to the maximum temperature, the heating relay in the battery box corresponding to the maximum temperature is closed, and the process returns to the step of obtaining the first temperature corresponding to each of the battery boxes.

[0024] In a preferred embodiment of the present invention, before obtaining the first temperature corresponding to each of the battery boxes, the method further includes:

[0025] Acquire a third temperature corresponding to each of the battery boxes;

[0026] When any of the third temperatures is less than or equal to a third threshold, the heating relay in each of the battery boxes, and the heating positive relay and the heating negative relay in the high voltage box are closed.

[0027] In a preferred embodiment of the present invention, after obtaining the first temperature corresponding to each of the battery boxes, the method further includes:

[0028] When the highest temperature among the first temperatures is greater than or equal to a second threshold, the heating relays in the battery boxes, and the heating positive relay and the heating negative relay in the high voltage box are disconnected.

[0029] In a third aspect, an embodiment of the present invention further provides a battery heating device, comprising:

[0030] A first temperature acquisition module, used to acquire a first temperature corresponding to each of the battery boxes; wherein the number of the first temperatures is the same as the number of the battery boxes;

[0031] A second temperature acquisition module, configured to disconnect the heating relay in the battery box corresponding to the highest temperature when the difference between the highest temperature and the lowest temperature among the first temperatures is greater than a first threshold, and acquire second temperatures corresponding to other battery boxes except the battery box corresponding to the highest temperature;

[0032] The regulating module is used to close the heating relay in the battery box corresponding to the highest temperature when each of the second temperatures is greater than or equal to the highest temperature, and return to execute the step of obtaining the first temperature corresponding to each of the battery boxes.

[0033] In a fourth aspect, an embodiment of the present invention further provides an electronic device, comprising a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the battery heating method of the second aspect.

[0034] In a fifth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement the battery heating method of the second aspect.

[0035] The embodiments of the present invention bring the following beneficial effects:

[0036] An embodiment of the present invention provides a battery system, which includes multiple battery boxes and a high-voltage box. The heating positive port of each battery box is connected in parallel to the heating total positive port of the high-voltage box, and the heating negative port of each battery box is connected in parallel to the heating total negative port of the high-voltage box, thereby realizing individual heating control of each battery box, avoiding temperature difference failures between battery cells caused by uneven temperature differences in the battery boxes, and reducing the failure rate of the battery boxes.

[0037] Other features and advantages of the present invention will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present invention.

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A structural diagram of a battery system provided by an embodiment of the present invention;

[0041] Figure 2 A flow chart of a battery heating method provided by an embodiment of the present invention;

[0042] Figure 3 A flow chart of another battery heating method provided by an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of the structure of a battery heating device provided by an embodiment of the present invention;

[0044] Figure 5 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention.

[0045] Reference numerals

[0046] 1. Battery box; 11. Battery negative port; 12. Battery positive port; 13. Heating negative port; 14. Heating positive port; 15. Communication interface; 2. High-voltage box; 21. Charging negative port; 22. Main circuit negative port; 23. Main circuit positive port; 24. Charging positive port; 25. Low-voltage input interface; 26. Battery total positive port; 27. Heating total positive port; 28. Heating total negative port; 29. ​​Battery total negative port; K1. Heating relay; K2. Heating relay; K3. Heating negative relay; K4. Heating positive relay; K5. Charging negative relay; K6. Main circuit negative relay; K7. Charging positive relay; FU1. First fuse; FU2. Second fuse; R1. Heating resistor; R2. Heating resistor; S1. Current transformer. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0048] As energy and environmental issues are becoming more and more important, electric vehicles have obvious advantages over traditional vehicles in terms of environmental protection and energy saving. At the same time, the government strongly supports electric vehicles. Now all major automobile manufacturers are conducting research and development of electric vehicles.

[0049] As an important component of electric vehicles, the performance of the battery pack is greatly affected by temperature. When the temperature of the battery pack is high, the activity of the battery pack increases, and the energy can be more effectively utilized, including the charging and discharging platform, efficiency, and available capacity of the battery pack. However, if the battery pack works in a high temperature environment for a long time, the battery life will be significantly shortened; when the temperature of the battery pack is low, the activity of the battery pack is significantly reduced, the internal resistance and polarization voltage of the battery pack increase, the actual available capacity decreases, the discharge capacity of the battery pack decreases, the discharge platform is low, and the battery pack is more likely to reach the discharge cut-off voltage, which is manifested as a decrease in the available capacity of the battery and a decrease in the energy utilization efficiency of the battery pack. Generally, when heating multiple battery packs of electric vehicle batteries, the temperature difference between the packs will gradually increase with the increase of heating time, thus affecting the normal driving of the vehicle.

[0050] Based on this, an embodiment of the present invention provides a battery system, in which the heating positive ports of each battery box and the heating negative ports of each battery box are connected in parallel, so as to realize the individual control of the heating process of each battery box, and solve the problem in the prior art that the temperature difference between the battery boxes gradually increases with the increase of heating time.

[0051] To facilitate understanding of this embodiment, a battery system disclosed in an embodiment of the present invention is first introduced in detail.

[0052] Example 1

[0053] An embodiment of the present invention provides a battery system. Figure 1 This is a structural diagram of a battery system provided by an embodiment of the present invention. Figure 1 As shown, the battery system includes: a high-voltage box 2 and multiple battery boxes 1, the battery box 1 includes a heating positive port 14 and a heating negative port 13, and the high-voltage box 2 includes a heating total positive port 27, a heating total negative port 28, a main circuit negative port 22 and a main circuit positive port 23.

[0054] The heating positive port 14 of each of the battery boxes 1 is connected in parallel to the heating total positive port 27 .

[0055] The heating negative port 13 of each of the battery boxes 1 is connected in parallel to the heating total negative port 28 .

[0056] A heating positive relay K4 and a first fuse FU1 are connected in series between the heating total positive port 27 and the main circuit positive port 23. The first fuse may be a fuse, and the model may be EV88-750-32A. The model of the heating positive relay K4 may be NDZ3T-40 / 750V.

[0057] A heating negative relay K3 and a main circuit negative relay K6 are connected in series between the heating total negative port 28 and the main circuit negative port 22. The model of the heating negative relay K3 is NDZ3T-40 / 750V. The model of the main circuit negative relay K6 can be NDZ3AT-300C / 750V.

[0058] The battery box 1 also includes a heating circuit and a communication interface 15. The heating circuit includes a heating resistor R1 and a heating relay K1 connected in series. The communication interface 15 is used to transmit the temperature of the battery box. The heating resistor R1 is used to heat the battery box, and the heating relay is used to connect or disconnect the heating circuit. The model of the heating resistor R1 can be: 860*174*2.8mm, PC+EVA. The model of the heating relay K1 can be: NDZ3AT-20C / 750V.

[0059] The high voltage box 2 further comprises a low voltage input interface 25, and the communication interfaces 15 of the battery boxes 1 are connected in series and connected to the low voltage input interface 25. The communication interface 15 of each battery box is used to transmit the temperature of the battery box.

[0060] Further, the high voltage box 2 also includes a total battery negative port 29, a total battery positive port 26, a charging negative port 21 and a charging positive port 24;

[0061] Among them, a current transformer S1 is connected between the middle position of the heating negative relay K3 and the main circuit negative relay K5 and the total negative port 29 of the battery; a charging negative relay K5 is connected between the middle position of the heating negative relay K3 and the main circuit negative relay K5 and the charging negative port 21; wherein, the model of the current transformer S1 may be: DHAB-S124. The model of the charging negative relay K5 may be: NDZ3AT-300C / 750V.

[0062] A second fuse FU2 is connected between the battery total positive port 26 and the main circuit positive port 23, and a charging positive relay K7 is connected between the charging positive port 24 and the main circuit positive port 23. The model of the charging positive relay K7 may be: NDZ3AT-300C / 750V.

[0063] The battery boxes are connected in series according to a preset sequence;

[0064] According to the preset sequence, the battery positive port 12 of the first battery box among the multiple battery boxes is connected to the battery total positive port 26, and the battery negative port 11 of the last battery box among the multiple battery boxes is connected to the battery total negative port 29. Exemplarily, there are 3 battery boxes, and the preset sequence is battery box A, battery box B, and battery box C, then battery box A is the first battery box, battery box C is the last battery box, the battery positive port of battery box A is connected to the battery total positive port, the battery negative port of battery box A is connected to the battery positive port of battery box B, the battery negative port of battery box B is connected to the battery positive port of battery box C, and the battery negative port of battery box C is connected to the battery total negative port.

[0065] The communication interface 15 of the battery box includes a first communication interface and a second communication interface;

[0066] The second communication interface of the first battery box among the multiple battery boxes is connected to the first communication interface of the second battery box among the multiple battery boxes; the first battery box and the second battery box are two adjacent battery boxes among the multiple battery boxes, and according to the preset order, the first battery box is before the second battery box; the second communication interface of the last battery box is connected to the low voltage input interface 25. The low voltage input interface 25 is used to provide a low voltage for the communication interface.

[0067] Exemplarily, there are 3 battery boxes and the preset order is battery box A, battery box B, and battery box C. Then battery box A is the first battery box, battery box C is the last battery box, the second communication interface of battery box A is connected to the first communication interface of battery box B, the second communication interface of battery box B is connected to the first communication interface of battery box C, and the second communication interface of battery box C is connected to the low voltage input interface.

[0068] The battery method provided in the embodiment of the present invention realizes the parallel connection of the heating circuits by connecting the heating positive port of each battery box in parallel to the heating total positive port, and connecting the heating negative port of each battery box in parallel to the heating total negative port, thereby providing a basis for individual heating control of each battery box, avoiding temperature difference failures between battery cells caused by uneven temperature difference in the battery box, and reducing the failure rate of the battery box.

[0069] Example 2

[0070] An embodiment of the present invention provides a battery heating method. Figure 2 Flow chart of a battery heating method provided by an embodiment of the present invention. Figure 2 As shown, the battery heating method may include the following steps:

[0071] Step S201, obtaining a first temperature corresponding to each of the battery boxes; wherein the number of the first temperatures is the same as the number of the battery boxes.

[0072] The first temperature refers to the temperature detected in real time when all battery boxes are in the heating process. For each battery box, the first temperature corresponding to the battery box can be detected in real time by a temperature sensor or other equipment, and the first temperature is transmitted to the server through a communication interface. A battery management system is running in the server.

[0073] Step S202, when the difference between the highest temperature and the lowest temperature among the first temperatures is greater than a first threshold, the heating relay in the battery box corresponding to the highest temperature is disconnected, and the second temperatures corresponding to the battery boxes other than the battery box corresponding to the highest temperature are obtained.

[0074] The highest temperature refers to the temperature with the largest value among the first temperatures detected at the same time. The lowest temperature refers to the temperature with the smallest value among the first temperatures detected at the same time. The first threshold is used to determine whether the temperature difference between the battery boxes is too large. Other battery boxes refer to battery boxes other than the battery box corresponding to the highest temperature, and the number of other battery boxes is at least one. The second temperature refers to the temperature obtained by real-time detection of other battery boxes after the heating relay in the battery box corresponding to the highest temperature is disconnected, that is, when at least one battery box stops heating, the temperature obtained by real-time detection of the battery box that is still being heated.

[0075] Specifically, for the first temperature corresponding to each battery box, sort them according to the size of the numerical value to determine the highest temperature and the lowest temperature. Compare the difference between the highest temperature and the lowest temperature with the first threshold. When the difference between the highest temperature and the lowest temperature is greater than the first threshold, it indicates that the temperature difference between the battery boxes is too large, which may affect the normal driving of the vehicle. At this time, the battery management system will control the heating relay in the battery box corresponding to the highest temperature to disconnect and stop heating the battery box corresponding to the highest temperature. For other battery boxes except the battery box corresponding to the highest temperature, obtain the second temperature corresponding to the other battery boxes. When the difference between the highest temperature and the lowest temperature is less than or equal to the first threshold, it indicates that the temperature difference between the battery boxes is within the normal range and will not affect the normal driving of the vehicle. At this time, continue to heat each battery box.

[0076] Step S203, when each of the second temperatures is greater than or equal to the maximum temperature, close the heating relay in the battery box corresponding to the maximum temperature, and return to execute the step of obtaining the first temperature corresponding to each of the battery boxes.

[0077] When the second temperature is greater than or equal to the maximum temperature, it indicates that the temperature difference between the temperature of other battery boxes and the temperature of the battery box corresponding to the maximum temperature is within the normal range. For other battery boxes, if there is a battery box with a second temperature lower than the maximum temperature, the heating relay in the battery box corresponding to the maximum temperature will remain disconnected until the second temperature of all other battery boxes is greater than or equal to the maximum temperature. At this time, the battery management system closes the heating relay in the battery box corresponding to the maximum temperature and continues to heat the battery box corresponding to the maximum temperature, that is, continues to heat all battery boxes in the battery system.

[0078] The battery heating method provided in the embodiment of the present invention monitors the first temperature of each battery box, and when the difference between the highest temperature and the lowest temperature in each first temperature is greater than a first threshold value, disconnects the heating relay in the battery box corresponding to the highest temperature, thereby realizing independent control of the battery box heating process, and by acquiring the second temperatures corresponding to other battery boxes, when each second temperature is greater than or equal to the highest temperature, realizing control of the temperature difference between each battery box, ensuring that the temperature difference between each battery box is always maintained within a normal range, avoiding temperature difference failure between battery cells caused by uneven temperature difference in the battery box, thereby affecting the normal driving of the vehicle, and reducing the failure rate of the battery box.

[0079] Example 3

[0080] The embodiment of the present invention also provides another battery heating method; this method is implemented on the basis of the method in the above embodiment; this method focuses on describing the specific implementation method before obtaining the first temperature corresponding to each battery box.

[0081] Figure 3 A flowchart of another battery heating method provided by an embodiment of the present invention is shown in FIG. Figure 3 As shown, the battery heating method may include the following steps:

[0082] Step S301, obtaining a third temperature corresponding to each of the battery boxes.

[0083] The third temperature refers to the temperature detected in real time before the battery box is heated. For each battery box, the third temperature corresponding to the battery box can be detected in real time by a temperature sensor or other device, and the first temperature can be transmitted to the server through the communication interface. The number of third temperatures is the same as the number of battery boxes, and the ambient temperature can also be used as the third temperature.

[0084] Step S302, when any of the third temperatures is less than or equal to a third threshold, closing the heating relay in each of the battery boxes, and the heating positive relay and the heating negative relay in the high-voltage box.

[0085] The third threshold is used to determine whether the temperature of the battery box is too low. When the third temperature is less than or equal to the third threshold, it indicates that the temperature of the battery box is too low and the battery box needs to be heated. When the third temperature is greater than the third threshold, it indicates that the temperature of the battery box is normal and the battery box does not need to be heated.

[0086] Specifically, for each third temperature, if at least one third temperature is less than or equal to the third threshold, that is, any third temperature among the third temperatures is less than or equal to the third threshold, it indicates that the temperature of at least one battery box in each battery box is too low. At this time, each battery box needs to be heated. The battery management system closes the heating relays in each battery box and the heating positive relay and the heating negative relay in the high-voltage box to heat the battery box.

[0087] Step S303, obtaining the first temperature corresponding to each of the battery boxes.

[0088] Step S304, when the highest temperature among the first temperatures is greater than or equal to a second threshold, disconnecting the heating relays in the battery boxes, and the heating positive relay and the heating negative relay in the high-voltage box.

[0089] The second threshold is used to determine whether the temperature of the battery box is too high. If the first temperature is greater than or equal to the second threshold, it indicates that the temperature of the battery box is too high and the heating of the battery box needs to be stopped. If the first temperature is less than the second threshold, it indicates that the temperature of the battery box is normal and the battery box can continue to be heated.

[0090] Specifically, for each first temperature, if at least one first temperature is greater than or equal to the second threshold, it indicates that the temperature of at least one battery box is too high, and heating should be stopped at this time. The battery management system will disconnect the heating relays in each battery box, as well as the heating positive relay and heating negative relay in the high-voltage box to stop heating. In another case, if all first temperatures are greater than or equal to the second threshold, it indicates that the temperature of all battery boxes is too high, and heating also needs to be stopped at this time. The battery management system will also disconnect the heating relays in each battery box, as well as the heating positive relay and heating negative relay in the high-voltage box to stop heating.

[0091] Step S305, when the difference between the highest temperature and the lowest temperature among the first temperatures is greater than a first threshold, the heating relay in the battery box corresponding to the highest temperature is disconnected, and the second temperatures corresponding to the battery boxes other than the battery box corresponding to the highest temperature are obtained.

[0092] Step S306, when each of the second temperatures is greater than or equal to the maximum temperature, close the heating relay in the battery box corresponding to the maximum temperature, and return to execute the step of obtaining the first temperature corresponding to each of the battery boxes.

[0093] The battery heating method provided in the embodiment of the present invention judges the temperature of the battery box through multiple thresholds, and determines different adjustment methods according to different threshold judgment conditions satisfied by the battery box temperature, thereby improving the flexibility of battery box temperature adjustment, reducing the failure rate of the battery box, and ensuring the safe driving of the vehicle.

[0094] Example 4

[0095] Corresponding to the above method embodiment, the embodiment of the present invention provides a battery heating device, Figure 4 A schematic diagram of the structure of a battery heating device provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, the battery heating device may include:

[0096] A first temperature acquisition module 401 is used to acquire a first temperature corresponding to each of the battery boxes; wherein the number of the first temperatures is the same as the number of the battery boxes;

[0097] A second temperature acquisition module 402 is used to disconnect the heating relay in the battery box corresponding to the highest temperature when the difference between the highest temperature and the lowest temperature among the first temperatures is greater than a first threshold, and to acquire second temperatures corresponding to other battery boxes except the battery box corresponding to the highest temperature;

[0098] The regulating module 403 is used to close the heating relay in the battery box corresponding to the highest temperature when each of the second temperatures is greater than or equal to the highest temperature, and return to execute the step of obtaining the first temperature corresponding to each of the battery boxes.

[0099] The battery heating device provided in the embodiment of the present invention monitors the first temperature of each battery box, and when the difference between the highest temperature and the lowest temperature in each first temperature is greater than a first threshold value, disconnects the heating relay in the battery box corresponding to the highest temperature, thereby realizing independent control of the heating process of the battery box, and by acquiring the second temperatures corresponding to other battery boxes, when each second temperature is greater than or equal to the highest temperature, realizing control of the temperature difference between the battery boxes, ensuring that the temperature difference between the battery boxes is always maintained within a normal range, avoiding temperature difference failures between battery cells caused by uneven temperature differences in the battery boxes, thereby affecting the normal driving of the vehicle, and reducing the failure rate of the battery boxes.

[0100] In some embodiments, the apparatus further comprises:

[0101] A third temperature acquisition module, used to acquire a third temperature corresponding to each of the battery boxes;

[0102] The heating module is started to close the heating relay in each of the battery boxes, and the heating positive relay and the heating negative relay in the high-voltage box when any of the third temperatures is less than or equal to a third threshold.

[0103] In some embodiments, the apparatus further comprises:

[0104] The heating module is stopped, and is used to disconnect the heating relays in each of the battery boxes, and the heating positive relay and the heating negative relay in the high-voltage box when the highest temperature among the first temperatures is greater than or equal to a second threshold.

[0105] The device provided in the embodiment of the present invention has the same implementation principle and technical effects as those of the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference may be made to the corresponding contents in the aforementioned method embodiment.

[0106] Example 5

[0107] The embodiment of the present invention also provides an electronic device for executing the above-mentioned battery heating method; see Figure 5 A structural schematic diagram of an electronic device is shown, the electronic device includes a memory 500 and a processor 501, wherein the memory 500 is used to store one or more computer instructions, and the one or more computer instructions are executed by the processor 501 to implement the above-mentioned battery heating method.

[0108] Further, Figure 5The electronic device shown further includes a bus 502 and a communication interface 503 , and the processor 501 , the communication interface 503 and the memory 500 are connected via the bus 502 .

[0109] The memory 500 may include a high-speed random access memory (RAM), and may also include a non-volatile memory, such as at least one disk storage. The communication connection between the system network element and at least one other network element is realized through at least one communication interface 503 (which may be wired or wireless), and the Internet, wide area network, local area network, metropolitan area network, etc. may be used. The bus 502 may be an ISA bus, a PCI bus, or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 5 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0110] The processor 501 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method can be completed by the hardware integrated logic circuit or software instructions in the processor 501. The above processor 501 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present invention can be directly embodied as a hardware decoding processor for execution, or a combination of hardware and software modules in the decoding processor for execution. The software module may be located in a storage medium mature in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 500, and the processor 501 reads the information in the memory 500 and completes the steps of the method of the above embodiment in combination with its hardware.

[0111] An embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement the above-mentioned battery heating method. The specific implementation can be found in the method embodiment, which will not be repeated here.

[0112] The computer program product for performing a battery heating method provided in an embodiment of the present invention includes a computer-readable storage medium storing a non-volatile program code executable by a processor. The instructions included in the program code can be used to execute the method described in the foregoing method embodiment. For specific implementation, please refer to the method embodiment, which will not be described in detail here.

[0113] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0114] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0115] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0116] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0117] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0118] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A battery system, characterized in that: The battery system comprises a high-voltage box and a plurality of battery boxes, the battery box comprises a heating positive port and a heating negative port, the high-voltage box comprises a heating total positive port, a heating total negative port, a main circuit negative port and a main circuit positive port; The heating positive port of each battery box is connected in parallel to the heating total positive port; The heating negative port of each of the battery boxes is connected in parallel to the heating total negative port; A heating positive relay and a first fuse are connected in series between the heating total positive port and the main circuit positive port; A heating negative relay and a main circuit negative relay are connected in series between the heating total negative port and the main circuit negative port; The battery box further comprises a heating circuit and a communication interface, wherein the heating circuit comprises a heating resistor and a heating relay connected in series, and the communication interface is used to transmit the temperature of the battery box; The high voltage box also includes a low voltage input interface, and the communication interfaces of the battery boxes are connected in series and connected to the low voltage input interface.

2. The system according to claim 1, characterized in that The high voltage box also includes a total battery negative port, a total battery positive port, a charging negative port, and a charging positive port; Among them, a current transformer is connected between the middle position of the heating negative relay and the main circuit negative relay and the total negative port of the battery; a charging negative relay is connected between the middle position of the heating negative relay and the main circuit negative relay and the charging negative port; A second fuse is connected between the battery total positive port and the main circuit positive port; a charging positive relay is connected between the charging positive port and the main circuit positive port.

3. The system according to claim 2, characterized in that The battery boxes are connected in series according to a preset sequence; According to the preset order, the battery positive port of the first battery box among the multiple battery boxes is connected to the battery total positive port, and the battery negative port of the last battery box among the multiple battery boxes is connected to the battery total negative port.

4. The system according to claim 3, characterized in that The communication interface of the battery box includes a first communication interface and a second communication interface; The second communication interface of the first battery box among the multiple battery boxes is connected to the first communication interface of the second battery box among the multiple battery boxes; the first battery box and the second battery box are two adjacent battery boxes among the multiple battery boxes, and according to the preset order, the first battery box is before the second battery box; The second communication interface of the last battery box is connected to the low voltage input interface.

5. A battery heating method, characterized in that: Applied to the battery system according to any one of claims 1 to 4, the method comprising: Acquire a first temperature corresponding to each of the battery boxes; wherein the number of the first temperatures is the same as the number of the battery boxes; When the difference between the highest temperature and the lowest temperature among the first temperatures is greater than a first threshold, disconnecting the heating relay in the battery box corresponding to the highest temperature, and obtaining the second temperatures corresponding to the battery boxes other than the battery box corresponding to the highest temperature; When each of the second temperatures is greater than or equal to the maximum temperature, the heating relay in the battery box corresponding to the maximum temperature is closed, and the process returns to the step of obtaining the first temperature corresponding to each of the battery boxes.

6. The method according to claim 5, characterized in that Before obtaining the first temperature corresponding to each of the battery boxes, the method further includes: Acquire a third temperature corresponding to each of the battery boxes; When any of the third temperatures is less than or equal to a third threshold, the heating relay in each of the battery boxes, and the heating positive relay and the heating negative relay in the high voltage box are closed.

7. The method according to claim 5, characterized in that After obtaining the first temperature corresponding to each of the battery boxes, the method further includes: When the highest temperature among the first temperatures is greater than or equal to a second threshold, the heating relays in the battery boxes, and the heating positive relay and the heating negative relay in the high voltage box are disconnected.

8. A battery heating device, characterized in that: The battery system according to any one of claims 1 to 4 comprises: A first temperature acquisition module, used to acquire a first temperature corresponding to each of the battery boxes; wherein the number of the first temperatures is the same as the number of the battery boxes; A second temperature acquisition module, configured to disconnect the heating relay in the battery box corresponding to the highest temperature when the difference between the highest temperature and the lowest temperature among the first temperatures is greater than a first threshold, and acquire second temperatures corresponding to other battery boxes except the battery box corresponding to the highest temperature; The regulating module is used to close the heating relay in the battery box corresponding to the highest temperature when each of the second temperatures is greater than or equal to the highest temperature, and return to execute the step of obtaining the first temperature corresponding to each of the battery boxes.

9. An electronic device, characterized in that: The invention comprises a processor and a memory, wherein the memory stores computer executable instructions that can be executed by the processor, and the processor executes the computer executable instructions to implement the battery heating method according to any one of claims 5 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement the battery heating method according to any one of claims 5 to 7.

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