Battery heating method, electronic device, and vehicle

Abstract

A battery heating method, an electronic device, and a vehicle. The battery heating method comprises: when a first battery and a second battery have heating requirements at the same time, determining whether the first battery and the second battery meet a preset heating condition or not; and if the first battery and the second battery meet the preset heating condition, controlling an energy transmission circuit to enable the first battery and the second battery to charge and discharge each other. The battery heating method is applied to a battery heating system; and the battery heating system comprises a first battery, a second battery, and an energy transmission circuit, wherein the energy transmission circuit is connected to the first battery and the second battery.

Description

Battery heating method, electronic device and vehicle

[0001] This application claims priority to Chinese application No. 202410465688.4, filed on April 17, 2024, entitled “Battery heating method, electronic device and vehicle”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] Embodiments of the present application relate to, but are not limited to, the technical field of battery, in particular to a battery heating method, an electronic device and a vehicle. BACKGROUND

[0003] At present, when there are two batteries on a vehicle, the heating method of the batteries is to control the two batteries to charge and discharge with each other between the capacitors or the alternating current charging device, so as to generate heat in the battery resistance and heat the battery. This scheme needs to configure two independent charging and discharging circuits, which has relatively high cost.

[0004] Therefore, it is necessary to make improvements to at least partially solve the above problems. TECHNICAL SOLUTION

[0005] In the content part of the application, a series of simplified concepts are introduced, which will be further described in detail in the specific embodiment part. The content part of the application does not mean to try to limit the key features and important technical features of the claimed technical solution, nor does it mean to try to determine the protection scope of the claimed technical solution.

[0006] In order to at least partially solve the above problems, according to the first aspect of the embodiments of the present application, a battery heating method is provided, the battery heating method comprising:

[0007] In response to the first battery and the second battery having heating requirements at the same time, and the first battery and the second battery satisfying a preset heating condition, controlling an energy transmission circuit to make the first battery and the second battery charge and discharge with each other.

[0008] Among them, the battery heating method is applied to a battery heating system, the battery heating system comprising the first battery, the second battery and the energy transmission circuit, the energy transmission circuit being connected with the first battery and the second battery.

[0009] Exemplarily, whether the first battery and the second battery have heating requirements at the same time is determined according to whether the temperature of the first battery and the second battery is lower than a first preset temperature threshold.

[0010] Exemplarily, the preset heating condition comprises:

[0011] The remaining power of the first battery is in a first preset power range, and the remaining power of the second battery is in a second preset power range; or

[0012] The current voltage of the first battery is in a first preset voltage range, and the current voltage of the second battery is in a second preset voltage range.

[0013] Exemplarily, when the energy transmission circuit is controlled to enable the first battery and the second battery to charge and discharge each other, the battery heating method further comprises:

[0014] In response to the first battery and the second battery satisfying a heating exit condition, the energy transmission circuit is controlled to stop the first battery and the second battery from charging and discharging each other.

[0015] Exemplarily, the heating exit condition comprises:

[0016] The temperature of the first battery and the second battery both reaches a second temperature threshold; or,

[0017] The remaining power of the first battery exceeds a first preset power range; or,

[0018] The remaining power of the second battery exceeds a second preset power range; or,

[0019] The current voltage of the first battery exceeds a first preset voltage range; or,

[0020] The current voltage of the second battery exceeds a second preset voltage range.

[0021] Exemplarily, the energy transmission circuit is a bidirectional DC-DC conversion circuit.

[0022] Exemplarily, the bidirectional DC-DC conversion circuit comprises an inductor and a bridge arm;

[0023] The first end of the inductor is connected with the positive electrode of the first battery, and the second end of the inductor is connected with the midpoint of the bridge arm; and

[0024] The first end of the bridge arm is connected with the positive electrode of the second battery, and the second end of the bridge arm is connected with the negative electrode of the second battery and the negative electrode of the first battery.

[0025] Exemplarily, the bridge arm comprises an upper bridge arm and a lower bridge arm; and

[0026] Controlling the energy transmission circuit to enable the first battery and the second battery to charge and discharge each other comprises:

[0027] Controlling the upper bridge arm and the lower bridge arm to alternately conduct.

[0028] Exemplarily, the inductor is a motor inductor, and the bridge arm is a bridge arm in a motor controller.

[0029] The energy transmission circuit further includes a switch, and the first end of the inductor is connected to the positive electrode of the first battery through the switch.

[0030] According to a second aspect of the embodiments of the present application, an electronic device is provided, which includes a memory, a processor, and computer instructions stored in the memory, and when the computer instructions are executed by the processor, the battery heating method described above is implemented.

[0031] According to a third aspect of the embodiments of the present application, a vehicle is provided, which includes the electronic device described above.

[0032] According to the battery heating method, the electronic device, and the vehicle of the embodiments of the present application, by controlling the energy transmission circuit to charge and discharge the first battery and the second battery, the simultaneous heating of the two batteries can be effectively realized, without the need to configure two separate charging and discharging circuits, which can effectively reduce the cost. Moreover, the present application only charges and discharges the first battery and the second battery when the first battery and the second battery meet the preset heating condition, rather than directly charging and discharging when there is a heating demand, which can effectively ensure the safety of the batteries. BRIEF DESCRIPTION OF DRAWINGS

[0033] The following drawings of the present application are hereby incorporated into the present application as part of the present application for the purpose of understanding the present application. The embodiments of the present application and their description shown in the drawings are used to explain the devices and principles of the present application. In the drawings,

[0034] FIG. 1 is a structural schematic diagram of a battery heating system according to an embodiment of the present application.

[0035] FIGS. 2-5 are schematic diagrams of current flow during mutual charging and discharging of the first battery and the second battery;

[0036] FIG. 6 is a flowchart of a battery heating method according to an embodiment of the present application;

[0037] FIG. 7 is a schematic structural block diagram of an electronic device according to an embodiment of the present application;

[0038] FIG. 8 is a schematic structural block diagram of a vehicle according to an embodiment of the present application.

[0039] Legend of reference signs: 10-battery heating system, 100-first battery, 200-second battery, 300-energy transmission circuit, 400-load, 500-energy transmission circuit, 600-charging pile; 20-electronic device, 21-memory, 22-processor; 30-vehicle.

[0040] Embodiments of the present application

[0041] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail so as not to unnecessarily complicate the present application.

[0042] It is to be understood that the application can assume various alternative forms of embodiment, and it is accordingly not to be limited by the examples set forth herein. Rather, the application is to cover all modifications falling within the scope of the application. In the drawings, the size and relative sizes of layers and regions can be exaggerated for clarity. Like numbers refer to like elements throughout.

[0043] It will be understood that, although the terms first, second, third, etc. can be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present application.

[0044] Spatially relative terms, such as "beneath", "below", "lower", "under", "above", "upper" and the like, can be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0045] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising", when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0046] Embodiments of the application are described herein with reference to the drawings, which are idealized representations of cross-sectional views of schematic diagrams of embodiments of the application (and intermediate structures). As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, embodiments of the application should not be construed as limited to the particular shapes of the regions illustrated herein, but are to include deviations in shapes that result, for example, from manufacturing. The regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the actual shape of a device and are not intended to limit the scope of the application.

[0047] With the rapid expansion of electric vehicles in the global automotive market, the charging speed of electric vehicles is one of the key factors affecting user experience. Especially in low temperature environment, due to the influence of battery performance, the charging current is small, resulting in slow charging speed. Therefore, it is extremely necessary to improve the charging speed of electric vehicles in low temperature environment. In addition, the driving range of electric vehicles is also closely related to the battery temperature. The driving range of electric vehicles at low temperature is greatly discounted. For example, the battery capacity of lithium battery at 0℃ is about 90% of the rated capacity of the battery; and once the battery temperature reaches-20℃, the battery capacity is about 70% of the rated capacity. Therefore, if the battery of the electric vehicle works in the low temperature environment for a long time, it will cause serious battery capacity attenuation and charging and discharging capacity decline.

[0048] Referring to FIG. 1, a battery heating system 10 according to an embodiment of the application is exemplarily illustrated.

[0049] The battery heating system 10 includes a first battery 100, a second battery 200 and an energy transmission circuit 300. It should be noted that the battery described in the embodiment of the application can be a single battery or a battery pack.

[0050] The energy transmission circuit 300 is connected with the first battery 100 and the second battery 200, and the first battery 100 and the second battery 200 can charge and discharge each other through the energy transmission circuit 300. That is, the first battery 100 can discharge to charge the second battery 200 through the energy transmission circuit 300, so as to generate heat by the internal resistance of the charged battery (i.e. the second battery 200) to heat the second battery 200; the second battery 200 can discharge to charge the first battery 100 through the energy transmission circuit 300, so as to generate heat by the internal resistance of the charged battery (i.e. the first battery 100) to heat the first battery 100, thereby realizing simultaneous heating of the first battery 100 and the second battery 200.

[0051] The battery heating system 10 of the embodiment can be a battery heating system on a vehicle, and the first battery 100 and the second battery 200 can be a low-voltage battery (e.g., a storage battery) and a high-voltage battery (e.g., a power battery) on the vehicle, respectively. Thus, the battery heating system 10 of the embodiment can heat the batteries without relying on external charging equipment, but using the existing batteries of the vehicle. The battery heating system 10 of the embodiment can also be applied to other electronic devices other than vehicles.

[0052] In the embodiment, the energy transmission circuit 300 is a bidirectional DC-DC conversion circuit. The energy transmission circuit 300 can convert the voltage between the first battery 100 and the second battery 200, so that the first battery 100 and the second battery 200 can charge and discharge each other. In some other embodiments, the energy transmission circuit 300 can include a boost circuit and a direct connection circuit. The battery with a lower voltage among the first battery 100 and the second battery 200 can charge the battery with a higher voltage through the boost circuit, and the battery with a higher voltage can charge the battery with a lower voltage through the direct connection circuit. Thus, by controlling the conduction and disconnection of the boost circuit and the direct connection circuit, the mutual charging and discharging can be realized.

[0053] In the embodiment, the energy transmission circuit 300 includes three first inductors L1 and three first bridge arms. Each first bridge arm includes an upper bridge arm and a lower bridge arm, the upper bridge arm being a switch tube Q1 and the lower bridge arm being a switch tube Q2. The first ends of the three first inductors L1 are connected to the positive pole of the first battery 100, the second ends of the three first inductors L1 are connected to the middle points of the three first bridge arms respectively, the first ends of the three first bridge arms are connected to the positive pole of the second battery 200, and the second ends of the three first bridge arms are connected to the negative pole of the second battery 200 and the negative pole of the first battery 100. In some other embodiments, the number of the first inductors L1 and the first bridge arms can be two, four or more first bridge arms. The first ends of the first inductors L1 are connected to the positive pole of the first battery 100, the second ends of the first inductors L1 are connected to the middle points of the first bridge arms respectively, the first ends of the first bridge arms are connected to the positive pole of the second battery 200, and the second ends of the first bridge arms are connected to the negative pole of the second battery 200 and the negative pole of the first battery 100. Thus, by controlling the energy transmission circuit 300 (i.e., controlling the conduction and disconnection of the upper bridge arms and the lower bridge arms of the first bridge arms), the first battery 100 can charge the second battery 200 to heat the second battery 200, or the second battery 200 can charge the first battery 100 to heat the first battery 100.

[0054] In the embodiment, the first inductor L1 is a motor inductor, and the first bridge arm is a bridge arm in a motor controller, that is, the inductor in the motor and the bridge arm in the motor controller in the multiplex vehicle are used as part of the energy transmission circuit 300, and no additional inductor and bridge arm are needed, so that the cost can be effectively reduced. In the embodiment, the energy transmission circuit 300 further includes a switch K1, and the first end of the second inductor is connected to the positive electrode of the first battery 100 through the switch K1, so that when the motor is normally working, the switch K1 can be disconnected to avoid mutual charging and discharging of the first battery 100 and the second battery 200; when the motor is not working, the switch K1 can be closed to realize mutual charging and discharging of the first battery 100 and the second battery 200.

[0055] In some other embodiments, the energy transmission circuit 300 can include one first inductor L1 and one first bridge arm. The first end of the first inductor L1 is connected to the positive electrode of the first battery 100, the second end of the first inductor L1 is connected to the midpoint of the first bridge arm, the first end of the first bridge arm is connected to the positive electrode of the second battery 200, and the second end of the first bridge arm is connected to the negative electrode of the second battery 200 and the negative electrode of the first battery 100.

[0056] In some other embodiments, the energy transmission circuit 300 can include one first inductor L1 and one first bridge arm. The first end of the first inductor L1 is connected to the positive electrode of the first battery 100, the second end of the first inductor L1 is connected to the midpoint of the first bridge arm, the first end of the first bridge arm is connected to the positive electrode of the second battery 200, and the second end of the first bridge arm is connected to the negative electrode of the second battery 200 and the negative electrode of the first battery 100.

[0057] In some other embodiments, the energy transmission circuit 300 can include one first inductor L1 and one first bridge arm. The first end of the first inductor L1 is connected to the positive electrode of the first battery 100, the second end of the first inductor L1 is connected to the midpoint of the first bridge arm, the first end of the first bridge arm is connected to the positive electrode of the second battery 200, and the second end of the first bridge arm is connected to the negative electrode of the second battery 200 and the negative electrode of the first battery 100.

[0058] The process of controlling the energy transmission circuit 300 to charge and discharge the first battery 100 and the second battery 200 is described with reference to FIGS. 2-5. First, referring to FIG. 2, the first switch K1 is controlled to be turned on, the lower bridge arm of the first bridge arm is turned on, the upper bridge arm is turned off, the current output by the first battery 100 flows into the first inductor L1, the first battery 100 is discharged, and the first inductor L1 is charged. Then, referring to FIG. 3, the first switch K1 is controlled to be turned on, the upper bridge arm of the first bridge arm is turned on, the lower bridge arm is turned off, the current output by the first battery 100 flows into the second battery 200 through the first inductor L1 and the switch tube Q1, the first battery 100 is discharged, and the second battery 200 is charged. Then, referring to FIG. 4, the first switch K1 is controlled to be turned on, the lower bridge arm of the first bridge arm is turned on, the upper bridge arm is turned off, the current output by the first inductor L1 flows into the first battery 100, the first inductor L1 is discharged, and the first battery 100 is charged. Then, referring to FIG. 5, the first switch K1 is controlled to be turned on, the upper bridge arm of the first bridge arm is turned on, the lower bridge arm is turned off, the current output by the second battery 200 flows into the first battery 100 through the switch tube Q1 and the first inductor L1, the second battery 200 is discharged, and the first battery 100 is charged. The above process is repeated, and the upper bridge arm and the lower bridge arm of the first bridge arm are controlled to be turned on alternately, so that the first battery 100 and the second battery 200 can be charged and discharged with each other, an oscillating current is formed, and due to the existence of the battery internal resistance, the first battery 100 and the second battery 200 generate heat by themselves when the current passes through, so as to achieve the purpose of simultaneously heating the first battery 100 and the second battery 200. After the first battery 100 and the second battery 200 are heated, the upper bridge arm and the lower bridge arm of the first bridge arm can be controlled to be turned off, so that the first battery 100 and the second battery 200 stop charging and discharging with each other.

[0059] In the embodiment, the battery heating system 10 further includes a load 400, and two ends of the load 400 are connected to two ends of the second battery 200 respectively, so that the second battery 200 can supply power to the load 400 to work.

[0060] In the embodiment, the battery heating system 10 further includes an energy transmission circuit 500, and the energy transmission circuit 500 is also connected to the first battery 100 and the second battery 200, so that the first battery 100 and the second battery 200 can charge and discharge with each other through the energy transmission circuit 500. The specific structure of the energy transmission circuit 500 and the connection method of the energy transmission circuit 500 to the first battery 100 and the second battery 200 can be the same as those of the energy transmission circuit 300 in the above embodiment, which will not be described herein again. The energy transmission circuit 500 and the energy transmission circuit 300 can be redundant to each other.

[0061] In the embodiment, the battery heating system 10 further comprises a switch K2 and a switch K3, a first end of the switch K2 is connected with the positive electrode of the first battery 100, a second end of the switch K2 is used to be connected with the positive electrode output end of the charging pile 600 (for example, the second end of the switch K2 can be connected to the positive electrode terminal in the charging port on the vehicle), a first end of the switch K3 is connected with the positive electrode of the second battery 200, a second end of the switch K3 is used to be connected with the positive electrode output end of the charging pile 600 (for example, the second end of the switch K3 can be connected to the positive electrode terminal in the charging port on the vehicle), and the negative electrode of the first battery 100 and the negative electrode of the second battery 200 are both used to be connected with the negative electrode output end of the charging pile 600 (for example, the negative electrode of the first battery 100 and the negative electrode of the second battery 200 can be connected to the negative electrode terminal in the charging port on the vehicle). Thus, when the switch K2 is closed, the charging pile 600 can charge the first battery 100, and when the switch K3 is closed, the charging pile 600 can charge the second battery 200.

[0062] Referring to FIG. 6, the embodiment of the present application further provides a battery heating method applied to the battery heating system 10 in the above embodiment. The battery heating method comprises:

[0063] S100: determining whether the first battery 100 and the second battery 200 have heating demands at the same time.

[0064] Specifically, the temperature of the first battery 100 and the second battery 200 can be detected by the temperature sensor arranged on the first battery 100 and the second battery 200, and it is determined whether the temperature of the first battery 100 and the second battery 200 is lower than the first preset temperature threshold. When the temperature of the first battery 100 and the second battery 200 is lower than the first preset temperature threshold, it is determined that the first battery 100 and the second battery 200 have heating demands at the same time. That is, whether the first battery 100 and the second battery 200 have heating demands at the same time is determined according to whether the temperature of the first battery 100 and the second battery 200 is lower than the first preset temperature threshold.

[0065] S200: when the first battery 100 and the second battery 200 have heating demands at the same time, determining whether the first battery 100 and the second battery 200 satisfy a preset heating condition.

[0066] Specifically, the preset heating condition is a necessary condition for the first battery 100 and the second battery 200 to perform safe charging and discharging. In the embodiment, the preset heating condition includes that the remaining power of the first battery 100 is in a first preset power range (at this time, the first battery 100 does not have the risk of overcharging and overdischarging), the remaining power of the second battery is in a second preset power range (at this time, the second battery 200 does not have the risk of overcharging and overdischarging); or, the current voltage of the first battery is in a first preset voltage range (at this time, the first battery 100 does not have the risk of overcharging and overdischarging), and the current voltage of the second battery is in a second preset voltage range (at this time, the second battery 200 does not have the risk of overcharging and overdischarging).

[0067] S300: When the first battery 100 and the second battery 200 have heating requirements at the same time, and the first battery 100 and the second battery 200 meet the preset heating condition, the energy transmission circuit is controlled to enable the first battery 100 and the second battery 200 to charge and discharge each other.

[0068] Specifically, the specific manner of controlling the energy transmission circuit to enable the first battery and the second battery to charge and discharge each other is specifically described in the above embodiment, which will not be repeated here. When the first battery 100 and the second battery 200 charge and discharge each other, the remaining power (or voltage) of the first battery 100 cannot be too high or too low to avoid overcharging or overdischarging, and the remaining power (or voltage) of the second battery 200 cannot be too high or too low to avoid overcharging or overdischarging. The embodiment controls the energy transmission circuit 300 to enable the first battery 100 and the second battery 200 to charge and discharge each other only when the first battery 100 and the second battery 200 meet the preset heating condition, which can effectively avoid overcharging and overdischarging of the first battery 100 and the second battery 200, thereby ensuring the safety of the first battery 100 and the second battery 200 during the heating process.

[0069] In the embodiment, the battery heating method further includes:

[0070] S400: When the energy transmission circuit 300 is controlled to enable the first battery 100 and the second battery 200 to charge and discharge each other, it is judged whether the first battery 100 and the second battery 200 meet the heating exit condition.

[0071] Specifically, the heating exit condition can be a condition corresponding to completion of heating of the first battery 100 and the second battery 200, or a condition corresponding to existence of a safety risk of the first battery 100 and the second battery 200. In this embodiment, the heating exit condition includes: the temperature of the first battery 100 and the second battery 200 reaching a second temperature threshold (i.e., a temperature threshold when the first battery 100 and the second battery 200 complete heating, the second temperature threshold being greater than the first temperature threshold); or, the remaining power of the first battery 100 exceeding a first preset power range (at this time, the first battery 100 exists a risk of over-discharge); or, the remaining power of the second battery 200 exceeding a second preset power range (at this time, the second battery 200 exists a risk of over-discharge); or, the current voltage of the first battery exceeding a first preset voltage range (at this time, the first battery 100 exists a risk of over-discharge); or, the current voltage of the second battery exceeding a second preset voltage range (at this time, the second battery 200 exists a risk of over-discharge).

[0072] S500: When the first battery 100 and the second battery 200 satisfy the heating exit condition, the energy transmission circuit is controlled to stop the first battery and the second battery from charging and discharging each other.

[0073] Specifically, the upper bridge arm and the lower bridge arm of the first bridge arm can be controlled to be disconnected, so that the first battery 100 and the second battery 200 stop charging and discharging each other. Thus, the battery heating method of this embodiment can stop the heating process as soon as the first battery 100 and the second battery 200 complete heating or exist a safety risk, so as to fully guarantee the safety of the batteries.

[0074] S600: When the first battery 100 and the second battery 200 do not satisfy the preset heating condition, other heating methods are used for heating, for example, a heat pump or an electric heater is used to simultaneously heat the first battery 100 and the second battery 200, so as to meet the heating demand of the first battery 100 and the second battery 200.

[0075] Referring to FIG. 7, the present embodiment further provides an electronic device 20, which includes a memory 21, a processor 22, and a computer program stored in the memory 21, wherein the computer program is executed by the processor 22 to implement the battery heating method as described above.

[0076] Referring to FIG. 8, the present embodiment further provides a vehicle 30, which includes the electronic device 20 as described above. The vehicle can be a pure electric vehicle or a hybrid electric vehicle.

[0077] Although example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the example embodiments are example and are not intended to limit the scope of the application to anything recited in the above description. Those skilled in the art can make various changes and modifications of the application without departing from the scope and spirit of the application. It is therefore intended that the application cover all such changes and modifications as fall within the scope of the application.

[0078] Those skilled in the art can realize the units and algorithm steps with the examples described in the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether the functions are performed in hardware or software depends on the particular application and design constraints. Professionals can realize the described functions in each particular application by using different methods, and the implementation should not be considered to be beyond the scope of the application.

[0079] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the above-described device embodiments are illustrative, and for example, the division of the units is a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another device, or some features can be omitted or not executed.

[0080] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not described in detail in order not to obscure the understanding of the specification.

[0081] Similarly, it can be understood that, in order to simplify the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, various features of the present application are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of the present application should not be interpreted as reflecting an intention that the claimed application requires more features than those explicitly recited in each claim. Rather, as reflected by the corresponding claims, the inventive point is that the corresponding technical problem can be solved with fewer features than all the features of a certain disclosed single embodiment. Therefore, the claims following the specific embodiments are hereby expressly incorporated into the specific embodiments, wherein each claim itself is a separate embodiment of the present application.

[0082] Those skilled in the art will appreciate that all features described herein (including all features and processes described in the accompanying claims, abstract and drawings) can be combined in any combination. Each feature or process of the description (including any accompanying claims, abstract and drawings) can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature of the description (including any accompanying claims, abstract and drawings) is expressly incorporated in each claim and each claim is expressly incorporated into the description (including any accompanying abstract and drawings).

[0083] Furthermore, those skilled in the art will appreciate that the features described herein, although characterized as being in certain embodiments rather than others, can be combined in any combination, meaning that the combinations of features of different embodiments are within the scope of the present application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0084] It is noted that the foregoing examples have been provided merely for the purposes of illustration and are not intended to limit the application as claimed. Other examples can be apparent to those of ordinary skill in the art from the foregoing description and accompanying drawings.

Claims

1. A battery heating method, wherein, the battery heating method comprises: in response to a first battery and a second battery both having a heating demand, and the first battery and the second battery satisfying a preset heating condition, controlling an energy transmission circuit to cause the first battery and the second battery to charge and discharge to each other; wherein the battery heating method is applied to a battery heating system, the battery heating system comprising the first battery, the second battery and the energy transmission circuit, the energy transmission circuit being connected with the first battery and the second battery.

2. The battery heating method according to claim 1, wherein, whether the first battery and the second battery both have a heating demand is determined according to whether the temperature of the first battery and the second battery is both lower than a first preset temperature threshold.

3. The battery heating method according to any one of claims 1-2, wherein, the preset heating condition comprises: a remaining power of the first battery is in a first preset power range, and a remaining power of the second battery is in a second preset power range; or, a current voltage of the first battery is in a first preset voltage range, and a current voltage of the second battery is in a second preset voltage range.

4. The battery heating method according to claim 3, wherein, when the energy transmission circuit is controlled to cause the first battery and the second battery to charge and discharge to each other, the battery heating method further comprises: in response to the first battery and the second battery satisfying a heating exit condition, controlling the energy transmission circuit to stop the first battery and the second battery from charging and discharging to each other.

5. The battery heating method according to claim 4, wherein, the heating exit condition comprises: the temperature of the first battery and the second battery both reaches a second temperature threshold; or, the remaining power of the first battery exceeds the first preset power range; or, the remaining power of the second battery exceeds the second preset power range; or, the current voltage of the first battery exceeds the first preset voltage range; or, the current voltage of the second battery exceeds the second preset voltage range.

6. The battery heating method according to any one of claims 1-5, wherein, the energy transmission circuit is a bidirectional DC-DC conversion circuit.

7. The battery heating method according to claim 6, wherein, the bidirectional DC-DC conversion circuit comprises an inductor and a bridge arm; a first end of the inductor is connected with a positive electrode of the first battery, and a second end of the inductor is connected with a midpoint of the bridge arm; and a first end of the bridge arm is connected with a positive electrode of the second battery, and a second end of the bridge arm is connected with a negative electrode of the second battery and a negative electrode of the first battery.

8. The battery heating method according to claim 7, wherein, the bridge arm comprises an upper bridge arm and a lower bridge arm; and controlling the energy transmission circuit to cause the first battery and the second battery to charge and discharge to each other comprises: controlling the upper bridge arm and the lower bridge arm to be alternately turned on.

9. The battery heating method according to claim 8, wherein, the inductor is a motor inductor, and the bridge arm is a bridge arm in a motor controller; and ​ The energy transmission circuit further comprises a switch, and a first end of the inductor is connected with the positive pole of the first battery through the switch.

10. An electronic device comprising a memory, a processor, and computer instructions stored on the memory, wherein, The computer instructions, when executed by the processor, implement the battery heating method according to any one of claims 1-9.

11. A vehicle, wherein, The electronic device comprises the electronic device according to claim 10.

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