Battery heating system, battery heating method, electronic device, and vehicle

Abstract

A vehicle provided with a battery heating system for executing a battery heating method and an electronic device. The battery heating system comprises: a first battery; a second battery, comprising a first sub-battery and a second sub-battery which are arranged in series; a first energy transmission circuit connected to the first battery and the second battery, wherein the first battery and the second battery can mutually charge and discharge by means of the first energy transmission circuit; and a second energy transmission circuit connected to the first sub-battery and the second sub-battery, wherein the first sub-battery and the second sub-battery can mutually charge and discharge by means of the second energy transmission circuit.

Description

Battery heating system, battery heating method, electronic device and vehicle

[0001] This application claims priority to Chinese application No. 2024104794140 filed on April 17, 2024, with the title of “Battery heating system, battery heating method, electronic device and vehicle”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to, but is not limited to, the technical field of batteries, in particular to a battery heating system, a battery heating method, an electronic device and a vehicle. BACKGROUND

[0003] With the rapid expansion of electric vehicles in the global automobile market, the charging speed of electric vehicles is one of the most important 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 only about 90% of the rated capacity of the battery; and once the battery temperature reaches-20℃, the battery capacity is only 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.

[0004] At present, the heating method of the battery is relatively single, and for multiple batteries, a corresponding charging circuit needs to be configured respectively, which has relatively high cost.

[0005] Therefore, it is necessary to improve to at least partially solve the above problems. TECHNICAL SOLUTION

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

[0007] a first battery;

[0008] a second battery, the second battery comprising a first sub-battery and a second sub-battery arranged in series;

[0009] a first energy transmission circuit connected with the first battery and the second battery, the first battery and the second battery being capable of charging and discharging each other through the first energy transmission circuit; and

[0010] a second energy transmission circuit connected with the first sub-battery and the second sub-battery, the first sub-battery and the second sub-battery being capable of charging and discharging each other through the second energy transmission circuit.

[0011] Exemplarily, the first energy transmission circuit and the second energy transmission circuit are both bidirectional DC-DC conversion circuits.

[0012] Exemplarily, the first energy transmission circuit comprises a first inductor and a first bridge arm;

[0013] a first end of the first inductor is connected with a positive electrode of the first battery, and a second end of the first inductor is connected with a midpoint of the first bridge arm;

[0014] a first end of the first bridge arm is connected with a positive electrode of the first sub battery, and a second end of the first bridge arm is connected with a negative electrode of the second sub battery and a negative electrode of the first battery, wherein a negative electrode of the first sub battery and a positive electrode of the second sub battery are connected.

[0015] Exemplarily, the second energy transmission circuit comprises a second inductor, a second bridge arm, a first switch and a second switch;

[0016] a first end of the second inductor is connected with a negative electrode of the first sub battery, and a second end of the second inductor is connected with a midpoint of the second bridge arm;

[0017] a first end of the second bridge arm is connected with a positive electrode of the first sub battery, and a second end of the second bridge arm is connected with a negative electrode of the second sub battery, wherein a negative electrode of the first sub battery and a positive electrode of the second sub battery are connected.

[0018] the first switch is arranged between the first end of the second bridge arm and the positive electrode of the first sub battery, or arranged between the negative electrode of the first sub battery and the positive electrode of the second sub battery and the first end of the second inductor;

[0019] the second switch is arranged between the second end of the second bridge arm and the negative electrode of the second sub battery, or arranged between the positive electrode of the second sub battery and the negative electrode of the first sub battery and the first end of the second inductor.

[0020] Exemplarily, the second inductor is a motor inductor, and the second bridge arm is a bridge arm in a motor controller.

[0021] The second energy transmission circuit further comprises a third switch, and the first end of the second inductor is connected with the negative electrode of the first sub battery through the third switch.

[0022] According to a second aspect of the present application, a battery heating method is provided, which comprises:

[0023] when a first battery has a heating demand, a first energy transmission circuit is controlled to charge the first battery by a second battery.

[0024] when the second battery has a heating demand, controlling the first energy transmission circuit to cause the first battery to charge the second battery, or, controlling the second energy transmission circuit to cause the first sub-battery and the second sub-battery to charge and discharge each other;

[0025] wherein the second battery comprises the first sub-battery and the second sub-battery arranged in series, the first energy transmission circuit is connected with the first battery and the second battery, and the second energy transmission circuit is connected with the first sub-battery and the second sub-battery.

[0026] Exemplarily, when the first battery has a heating demand, the battery heating method further comprises:

[0027] when the first battery and the second battery satisfy a first preset heating condition, controlling the first energy transmission circuit to cause the second battery to charge the first battery.

[0028] Exemplarily, the first preset heating condition comprises:

[0029] a remaining electric quantity of the first battery is lower than a first electric quantity threshold, and a remaining electric quantity of the second battery is higher than a second electric quantity threshold; or,

[0030] a current voltage of the first battery is lower than a first voltage threshold, and a current voltage of the second battery is higher than a second voltage threshold.

[0031] Exemplarily, when the first energy transmission circuit is controlled to cause the second battery to charge the first battery, the battery heating method further comprises:

[0032] when the first battery and the second battery satisfy a first heating exit condition, controlling the first energy transmission circuit to cause the second battery to stop charging the first battery.

[0033] Exemplarily, the first heating exit condition comprises:

[0034] a temperature of the first battery reaches a first temperature threshold; or,

[0035] a remaining electric quantity of the first battery reaches the first electric quantity threshold; or,

[0036] a remaining electric quantity of the second battery reaches the second electric quantity threshold; or,

[0037] a current voltage of the first battery reaches the first voltage threshold; or,

[0038] a current voltage of the second battery reaches the second voltage threshold.

[0039] Exemplarily, when the second battery has a heating demand, the battery heating method further comprises:

[0040] controlling the first energy transmission circuit to enable the first battery to charge the second battery when the first battery and the second battery satisfy a second preset heating condition;

[0041] controlling the second energy transmission circuit to enable the first sub-battery and the second sub-battery to charge and discharge each other when the first battery and the second battery satisfy a third preset heating condition.

[0042] Exemplarily, the second preset heating condition comprises:

[0043] a remaining electric quantity of the first battery is higher than a third electric quantity threshold, and a remaining electric quantity of the second battery is lower than a fourth electric quantity threshold; or,

[0044] a current voltage of the first battery is higher than a third voltage threshold, and a current voltage of the second battery is lower than a fourth voltage threshold;

[0045] The third preset heating condition comprises:

[0046] a remaining electric quantity of the first battery is not higher than the third electric quantity threshold, a remaining electric quantity of the first sub-battery is in a first preset electric quantity range, and a remaining electric quantity of the second sub-battery is in a second preset electric quantity range; or,

[0047] a current voltage of the first battery is not higher than the third voltage threshold, a current voltage of the first sub-battery is in a first preset voltage range, and a current voltage of the second sub-battery is in a second preset voltage range.

[0048] Exemplarily, when the first energy transmission circuit is controlled to enable the first battery to charge the second battery, the battery heating method further comprises:

[0049] controlling the first energy transmission circuit to enable the first battery to stop charging the second battery when the first battery and the second battery satisfy a second heating exit condition.

[0050] Exemplarily, the second heating exit condition comprises:

[0051] a temperature of the second battery reaches a second temperature threshold; or,

[0052] a remaining electric quantity of the first battery reaches the third electric quantity threshold; or,

[0053] a remaining electric quantity of the second battery reaches the fourth electric quantity threshold; or,

[0054] the current voltage of the first battery reaches the third voltage threshold; or

[0055] the current voltage of the second battery reaches the fourth voltage threshold.

[0056] Exemplarily, when the second energy transmission circuit is controlled to enable the first sub-battery and the second sub-battery to charge and discharge with each other, the battery heating method further comprises:

[0057] determining whether the second battery satisfies a third heating exit condition;

[0058] when the second battery satisfies the third heating exit condition, controlling the second energy transmission circuit to enable the first sub-battery and the second sub-battery to stop charging and discharging with each other.

[0059] Exemplarily, the third heating exit condition comprises:

[0060] the temperature of the second battery reaches a third temperature threshold; or

[0061] the remaining power of the first sub-battery is out of a first preset power range; or

[0062] the remaining power of the second sub-battery is out of a second preset power range; or

[0063] the current voltage of the first sub-battery is out of a first preset voltage range; or

[0064] the current voltage of the second sub-battery is out of a second preset voltage range.

[0065] According to a third aspect of the present application, an electronic device is provided, comprising a memory, a processor and a computer program stored in the memory, when the computer program is executed by the processor, the battery heating method as described above is implemented.

[0066] According to a fourth aspect of the present application, a vehicle is provided, comprising the battery heating system as described above and / or the electronic device as described above.

[0067] According to the battery heating system, the battery heating method, the electronic device and the vehicle of the present application, the first battery and the second battery can charge and discharge with each other through the first energy transmission circuit, the first sub-battery and the second sub-battery can charge and discharge with each other through the second energy transmission circuit, so that the first battery can charge the second battery to heat the second battery, the second battery can charge the first battery to heat the first battery, and the first sub-battery and the second sub-battery can charge and discharge with each other to realize self-heating. Thus, the heating mode of the present application is various, and the heating of the first battery or the second battery can be effectively realized. BRIEF DESCRIPTION OF DRAWINGS

[0068] The following drawings for this application are hereby incorporated into this application as part of this application for understanding this application. The embodiments of this application and its description shown in the drawings are used to explain the devices and principles of this application. In the drawings,

[0069] Fig. 1 is a structural schematic diagram of a battery heating system according to an embodiment of the present application;

[0070] Figs. 2 and 3 are schematic diagrams of current flow in the process of charging the first battery by the second battery;

[0071] Figs. 4 and 5 are schematic diagrams of current flow in the process of charging the second battery by the first battery;

[0072] Figs. 6-9 are schematic diagrams of current flow in the process of charging and discharging the first sub-battery and the second sub-battery by each other;

[0073] Fig. 10 is a flow schematic diagram of a battery heating method according to an embodiment of the present application;

[0074] Fig. 11 is a flow schematic diagram of a battery heating method according to an embodiment of the present application;

[0075] Fig. 12 is a schematic structural block diagram of an electronic device according to an embodiment of the present application;

[0076] Fig. 13 is a schematic structural block diagram of a vehicle according to an embodiment of the present application.

[0077] Legend of reference signs: 10 - battery heating system, 100 - first battery, 200 - second battery, 210 - first sub-battery, 220 - second sub-battery, 300 - first energy transmission circuit, 400 - second energy transmission circuit, 500 - load, 600 - charging pile; 20 - electronic device, 21 - memory, 22 - processor; 30 - vehicle.

[0078] Embodiments of the present application

[0079] 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 to avoid obscuring the present application.

[0080] It should be understood that the present application can be carried out in various forms and should not be construed to be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art. In the drawings, the sizes and relative sizes of layers and regions can be exaggerated for clarity. Like reference numerals can denote like elements throughout the specification. Throughout the specification, and in each of the embodiments, terms such as "comprises", "comprising", "includes", "including", "contains", "containing" or variations thereof will be understood to imply a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Further, unless otherwise specified, terms such as "first" and "second" are used herein merely as labels, and are not intended to impose numerical requirements on their objects. For example, a first element could be a second element, and, similarly, a second element could be a first element unless it is specified otherwise.

[0081] It should 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 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.

[0082] 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 and / or operation in addition to the orientations depicted in the figures.

[0083] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present 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.

[0084] Referring to FIG. 1, a battery heating system 10 according to an embodiment of the present application is exemplarily illustrated.

[0085] The battery heating system 10 includes a first battery 100, a second battery 200, a first energy transmission circuit 300 and a second energy transmission circuit 400. The second battery 200 includes a first sub-battery 210 and a second sub-battery 220 connected in series. It should be noted that the batteries and sub-batteries described in the present application can be single batteries or battery packs.

[0086] The first 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 first energy transmission circuit 300. That is, the second battery 200 (that is, the first sub-battery 210 and the second sub-battery 220 as a whole) can discharge through the first energy transmission circuit 300 to charge the first battery 100, so as to generate heat by the internal resistance of the charged battery (that is, the first battery 100) to heat the first battery 100; the first battery 100 can discharge through the first energy transmission circuit 300 to charge the second battery 200 (that is, the first sub-battery 210 and the second sub-battery 220 as a whole), so as to generate heat by the internal resistance of the charged battery (that is, the second battery 200) to heat the second battery 200.

[0087] The second energy transmission circuit 400 is connected with the first sub-battery 210 and the second sub-battery 220, and the first sub-battery 210 and the second sub-battery 220 can charge and discharge each other through the second energy transmission circuit 400. The first battery 100 can charge the second battery 200 to heat the second battery 200, and the first sub-battery 210 and the second sub-battery 220 can charge and discharge each other to realize self-heating. That is, the first sub-battery 210 can discharge through the second energy transmission circuit 400 to charge the second sub-battery 220 to heat the second sub-battery 220; the second sub-battery 220 can discharge through the second energy transmission circuit 400 to charge the first battery 100 to heat the first sub-battery 210, thereby realizing heating of the first sub-battery 210 and the second sub-battery 220, that is, realizing self-heating of the second battery 200.

[0088] The battery heating system 10 of the embodiment has various heating modes, including charging the second battery 200 by the first battery 100 to heat the second battery 200, charging the first battery 100 by the second battery 200 to heat the first battery 100, and charging and discharging each other by the first sub-battery 210 and the second sub-battery 220 to realize self-heating of the second battery 200, which can effectively realize heating of the first battery 100 or the second battery 200, and has simple structure and relatively low cost.

[0089] The battery heating system 10 of the application 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 (such as a storage battery) and a high-voltage battery (such as a power battery) on the vehicle, respectively, so that the battery heating system 10 of the application can realize heating of the battery by using the existing battery of the vehicle without relying on external charging equipment. The battery heating system 10 of the application can also be applied to other electronic devices other than vehicles.

[0090] In the embodiment, the first energy transmission circuit 300 and the second energy transmission circuit 400 are both bidirectional DC-DC conversion circuits. The first energy transmission circuit 300 can perform voltage conversion 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. The second energy transmission circuit 400 can perform voltage conversion between the first sub-battery 210 and the second sub-battery 220, so that the first battery 100 and the second battery 200 can charge and discharge each other. In other embodiments, the first energy transmission circuit 300 and the second energy transmission circuit 400 can each include a boost circuit and a direct connection circuit. The battery with lower voltage in the first battery 100 and the second battery 200 can charge the battery with higher voltage through the boost circuit, and the battery with higher voltage can charge the battery with lower voltage through the direct connection circuit, so that the mutual charging and discharging can be realized by controlling the conduction and disconnection of the boost circuit and the direct connection circuit. The first sub-battery 210 and the second sub-battery 220 are the same.

[0091] Referring to FIG. 1, in the embodiment, the first energy transmission circuit 300 includes a first inductor L1 and a first bridge arm, and the first bridge arm includes an upper bridge arm and a lower bridge arm. The upper bridge arm is a switch tube Q1, and the lower bridge arm is a switch tube Q2. The first end of the first inductor is connected with the positive electrode of the first battery 100, and the second end of the first inductor is connected with the midpoint of the first bridge arm. The first end of the first bridge arm is connected with the positive electrode of the first sub-battery 210, and the second end of the first bridge arm is connected with the negative electrode of the second sub-battery 220 and the negative electrode of the first battery 100. The negative electrode of the first sub-battery 210 and the positive electrode of the second sub-battery 220 are connected. Thus, by controlling the first energy transmission circuit 300 (i.e., controlling the conduction and disconnection of the upper bridge arm and the lower bridge arm of the first bridge arm), the second battery 200 can charge the first battery 100 to heat the first battery 100, or the first battery 100 can charge the second battery 200 to heat the second battery 200.

[0092] In other embodiments, the first energy transmission circuit 300 can include a plurality of first inductors L1 and a first bridge arm. The first ends of the plurality of first inductors L1 are each connected with the positive electrode of the first battery 100, and the second ends of the plurality of first inductors L1 are each connected with the midpoint of the first bridge arm. The first end of the first bridge arm is connected with the positive electrode of the first sub-battery 210, and the second end of the first bridge arm is connected with the negative electrode of the second sub-battery 220 and the negative electrode of the first battery 100.

[0093] In some other embodiments, the first energy transmission circuit 300 can include a first inductor L1 and a plurality of first bridge arms, a first end of the first inductor L1 being connected to the positive pole of the first battery 100, and a second end of the first inductor L1 being connected to the midpoints of the plurality of first bridge arms. First ends of the plurality of first bridge arms are connected to the positive pole of the first sub-battery 210, and second ends of the plurality of first bridge arms are connected to the negative pole of the second sub-battery 220 and the negative pole of the first battery 100.

[0094] In some other embodiments, the first energy transmission circuit 300 can include a plurality of first inductors L1 and a plurality of first bridge arms, first ends of the plurality of first inductors L1 being connected to the positive pole of the first battery 100, and second ends of the plurality of first inductors L1 being connected to the midpoints of the plurality of first bridge arms respectively. First ends of the plurality of first bridge arms are connected to the positive pole of the first sub-battery 210, and second ends of the plurality of first bridge arms are connected to the negative pole of the second sub-battery 220 and the negative pole of the first battery 100.

[0095] The process of controlling the first energy transmission circuit 300 to charge the second battery 200 by the first battery 100 is described with reference to FIGS. 2 and 3. First, referring to FIG. 2, the upper bridge arm of the first bridge arm is turned on, and the lower bridge arm is turned off, and the current output by the second battery 200 flows into the first battery 100 through the switch tube Q1 and the first inductor L1 in sequence, the second battery 200 is discharged, the first battery 100 is charged, and the first inductor L1 is charged. Then, referring to FIG. 3, the upper bridge arm of the first bridge arm is turned off, and the lower bridge arm is turned on, and 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. The above process is repeated, and the upper and lower bridge arms are controlled to be turned on alternately, and the second battery 200 can be discharged unidirectionally and pulsed to the first battery 100 through the step-down circuit composed of the first inductor L1 and the first bridge arm, so that heat is generated by the internal resistance of the first battery 100, and the purpose of heating the first battery 100 while charging is achieved. After the first battery 100 is heated, the upper and lower bridge arms of the first bridge arm can be controlled to be turned off to stop the first battery 100 from charging the second battery 200.

[0096] The process of controlling the first energy transmission circuit 300 to charge the first battery 100 by the second battery 200 is described with reference to FIGS. 4 and 5. First, referring to FIG. 4, the lower bridge arm of the first bridge arm is turned on and 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. 5, the upper bridge arm of the first bridge arm is turned on and 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 Q1 in turn, the first battery 100 and the first inductor L1 are discharged, and the second battery 200 is charged. By repeating the above process, the upper and lower bridge arms are turned on alternately, and the first battery 100 can be unidirectionally pulsed discharged by the second battery 200 through the boost circuit composed of the first inductor L1 and the first bridge arm, so that heat is generated by the internal resistance of the second battery 200, and the second battery 200 can be heated while being charged. After the second battery 200 is heated, the upper and lower bridge arms of the first bridge arm can be turned off to stop the second battery 200 from charging the first battery 100.

[0097] In the embodiment, the second energy transmission circuit 400 includes three second inductors L2, three second bridge arms, a first switch K1 and a second switch K2. Each second bridge arm includes an upper bridge arm and a lower bridge arm, the upper bridge arm being a switch tube Q3 and the lower bridge arm being a switch tube Q4. The first ends of the three second inductors L2 are connected to the negative electrode of the first sub-battery 210, the second ends of the three second inductors L2 are connected to the middle points of the three second bridge arms respectively, the first ends of the three second bridge arms are connected to the positive electrode of the first sub-battery 210, and the second ends of the three second bridge arms are connected to the negative electrode of the second sub-battery 220, wherein the negative electrode of the first sub-battery 210 and the positive electrode of the second sub-battery 220 are connected. The first switch K1 is arranged between the first end of the second bridge arm and the positive electrode of the first sub-battery 210, and the second switch K2 is arranged between the second end of the second bridge arm and the negative electrode of the second sub-battery 220. In some other embodiments, the first switch K1 can also be arranged between the negative electrode of the first sub-battery 210 and the positive electrode of the second sub-battery 220 and the first end of the second inductor L2, that is, between the connection point of the negative electrode of the first sub-battery 210, the positive electrode of the second sub-battery 220 and the second inductor L2 and the negative electrode of the first sub-battery 210. In some other embodiments, the second switch K2 can also be arranged between the positive electrode of the second sub-battery 220 and the negative electrode of the first sub-battery 210 and the first end of the second inductor L2, that is, between the connection point of the positive electrode of the second sub-battery 220, the negative electrode of the first sub-battery 210 and the second inductor L2 and the positive electrode of the second sub-battery 220. In some other embodiments, the number of the second inductors L2 and the second bridge arms can be two, four or more second bridge arms. The first ends of the second inductors L2 are connected to the negative electrode of the first sub-battery 210, the second ends of the second inductors L2 are connected to the middle points of the second bridge arms respectively, the first ends of the second bridge arms are connected to the positive electrode of the first sub-battery 210, and the second ends of the second bridge arms are connected to the negative electrode of the second sub-battery 220. Thus, by controlling the second energy transmission circuit 400 (that is, controlling the on-off of the upper bridge arm and the lower bridge arm of the second bridge arm, the first switch K1 and the second switch K2), the second battery 200 can charge the first battery 100 to heat the first battery 100, or the first battery 100 can charge the second battery 200 to heat the second battery 200.

[0098] In this embodiment, the second inductor L2 is the motor inductor, and the second bridge arm is the bridge arm in the motor controller. That is, the inductor in the motor and the bridge arm in the motor controller of the reused vehicle in this application serve as part of the second energy transmission circuit 400, eliminating the need for additional inductors and bridge arms, effectively reducing costs. In this embodiment, the second energy transmission circuit 400 also includes a third switch K3, through which the first end of the second inductor is connected to the negative electrode of the first sub-battery 210. Thus, when the motor is operating normally, the third switch K3 can be opened to prevent the first sub-battery 210 and the second sub-battery 220 from charging and discharging each other during this process. When the motor is not operating, the third switch K3 can be closed to enable the first sub-battery 210 and the second sub-battery 220 to charge and discharge each other.

[0099] In some other embodiments, the second energy transmission circuit 400 may include a second inductor L2, a second bridge arm, a first switch K1, and a second switch K2. The first end of the second inductor L2 is connected to the negative electrode of the first sub-battery 210, the second end of the second inductor L2 is connected to the midpoint of the second bridge arm, the first end of the second bridge arm is connected to the positive electrode of the first sub-battery 210, and the second end of the second bridge arm is connected to the negative electrode of the second sub-battery 220. The configuration of the first switch K1 and the second switch K2 is the same as in the above embodiment and will not be repeated here.

[0100] In some other embodiments, the second energy transmission circuit 400 may include a second inductor L2, multiple second bridge arms, a first switch K1, and a second switch K2. The first end of the second inductor L2 is connected to the negative electrode of the first sub-battery 210, the second end of the second inductor L2 is simultaneously connected to the midpoints of the multiple second bridge arms, the first ends of the multiple second bridge arms are all connected to the positive electrode of the first sub-battery 210, and the second ends of the multiple second bridge arms are all connected to the negative electrode of the second sub-battery 220. The configuration of the first switch K1 and the second switch K2 is the same as in the above embodiment and will not be repeated here.

[0101] In some other embodiments, the second energy transmission circuit 400 may include multiple second inductors L2, a second bridge arm, a first switch K1, and a second switch K2. The first ends of the multiple second inductors L2 are connected to the negative electrode of the first sub-battery 210, the second ends of the multiple second inductors L2 are simultaneously connected to the midpoints of the multiple second bridge arms, the first end of the second bridge arm is connected to the positive electrode of the first sub-battery 210, and the second end of the second bridge arm is connected to the negative electrode of the second sub-battery 220. The configuration of the first switch K1 and the second switch K2 is the same as in the above embodiment and will not be repeated here.

[0102] The process of controlling the first energy transmission circuit 300 so that the second battery 200 charges the first battery 100 is described with reference to Figures 6-9. First, referring to Figure 6, the first switch K1 and the third switch K3 are controlled to be turned on, the second switch K2 is turned off, the upper arm of the second bridge arm is turned on, and the lower arm is turned off. The current output by the first sub-battery 210 flows into the second inductor L2 through the switch tube Q3, the first sub-battery 210 is discharged, and the second inductor L2 is charged. Then, referring to Figure 7, the first switch K1 is controlled to be turned off, the second switch K2 and the third switch K3 are controlled to be turned on, the lower arm of the second bridge arm is turned on, and the upper arm is turned off. The current output by the second inductor L2 flows into the second sub-battery 220, the second inductor L2 is discharged, and the second sub-battery 220 is charged. Then, Referring to FIG8 , the first switch K1 is controlled to be off, the second switch K2 and the third switch K3 are controlled to be on, the lower arm of the second bridge arm is controlled to be on, and the upper arm of the second bridge arm is controlled to be off. The duty cycle of the switch Q4 is adjusted so that the current output by the second sub-battery 220 flows into the second inductor L2, discharging the second sub-battery 220 and charging the second inductor L2. Then, referring to FIG9 , the first switch K1 and the third switch K3 are controlled to be on, the second switch K2 is controlled to be off, the upper arm of the second bridge arm is controlled to be on, and the lower arm of the second bridge arm is controlled to be off. The current output by the second inductor L2 flows into the first sub-battery 210, discharging the second inductor L2 and charging the first sub-battery 210. Repeating the above process can cause the first sub-battery 210 and the second sub-battery 220 to charge and discharge each other, forming an oscillating current. Due to the internal resistance of the batteries, the current flowing through the first sub-battery 210 and the second sub-battery 220 generates heat, thereby achieving the purpose of self-heating of the second sub-battery 200. After the second battery 200 is heated, the upper bridge arm and the lower bridge arm of the second bridge arm can be controlled to be disconnected, so that the first sub-battery 210 and the second sub-battery 220 stop charging and discharging each other.

[0103] In this embodiment, the battery heating system 10 further includes a load 500 , and two ends of the load 500 are respectively connected to two ends of the second battery 200 . The second battery 200 can supply power to the load 500 to enable it to operate.

[0104] In this embodiment, the battery heating system 10 further includes a switch K4 and a switch K5. The first end of the switch K4 is connected to the positive electrode of the first battery 100, and the second end of the switch K4 is used to connect to the positive output terminal of the charging pile 600 (for example, the second end of the switch K4 can be connected to the positive terminal of the charging port on the vehicle). The first end of the switch K5 is connected to the positive electrode of the first sub-battery 210, and the second end of the switch K5 is used to connect to the positive output terminal of the charging pile 600 (for example, the second end of the switch K5 can be connected to the positive terminal of the charging port on the vehicle). The negative electrode of the first battery 100 and the negative electrode of the second sub-battery 220 are both used to connect to the negative output terminal of the charging pile 600 (for example, the negative electrode of the first battery 100 and the negative electrode of the second sub-battery 220 can be connected to the negative terminal of the charging port on the vehicle). Thus, when the switch K4 is closed, the charging pile 600 can charge the first battery 100, and when the switch K5 is closed, the charging pile 600 can charge the second battery 200.

[0105] Referring to FIG. 10 , the present application also provides a battery heating method, which is applied to a battery heating system. The battery heating system includes a first battery, a second battery, a first energy transmission circuit, and a second energy transmission circuit. The second battery includes a first sub-battery and a second sub-battery connected in series. The first energy transmission circuit is connected to the first battery and the second battery, and the second energy transmission circuit is connected to the first sub-battery and the second sub-battery. The first battery and the second battery can be charged and discharged with each other via the first energy transmission circuit, and the first sub-battery and the second sub-battery can be charged and discharged with each other via the second energy transmission circuit.

[0106] Exemplarily, the battery heating system may be the battery heating system 10 in the above embodiment. Accordingly, the battery heating method includes:

[0107] S100: Determine whether the first battery 100 and the second battery 200 need to be heated.

[0108] Specifically, it is determined whether the first battery 100 and the second battery 200 need to be heated. For example, the temperatures of the first battery 100 and the second battery 200 can be detected by temperature sensors provided on the first battery 100 and the second battery 200. When the temperature of either the first battery 100 or the second battery 200 is lower than a set temperature threshold, it is determined that there is a need for heating.

[0109] S110 : When the first battery 100 needs to be heated, the first energy transmission circuit 300 is controlled to enable the second battery 200 to charge the first battery 100 .

[0110] Specifically, the specific process of controlling the first energy transmission circuit 300 to enable the second battery 200 to charge the first battery 100 is described in detail in the above embodiment and will not be repeated here. The second battery 200 charging the first battery 100 can generate heat through the internal resistance of the first battery 100, thereby achieving the purpose of simultaneously heating the first battery 100 while charging.

[0111] S120: When the second battery 200 needs to be heated, the first energy transmission circuit 300 is controlled to enable the first battery 100 to charge the second battery 200, or the second energy transmission circuit 400 is controlled to enable the first sub-battery 210 and the second sub-battery 220 to charge and discharge each other.

[0112] Specifically, the specific process of controlling the first energy transmission circuit 300 to enable the first battery 100 to charge the second battery 200, and the specific process of controlling the second energy transmission circuit 400 to mutually charge and discharge the first sub-battery 210 and the second sub-battery 220 have been described in detail in the above embodiments and will not be repeated here. Both the charging of the second battery 200 by the first battery 100 and the mutual charging and discharging of the first sub-battery 210 and the second sub-battery 220 can generate heat through the internal resistance of the second battery 200, thereby heating the second battery 200.

[0113] According to the battery heating method of this embodiment, multiple heating modes are provided. In particular, when the second battery 200 needs to be heated, two independent heating modes are provided. The two heating modes can be redundant to each other to effectively meet the heating needs of the second battery 200.

[0114] Referring to FIG. 11 , the present application further provides a battery heating method, which is applied to the battery heating system 10 in the above embodiment. The battery heating method includes:

[0115] S200: Determine whether the first battery 100 and the second battery 200 need to be heated.

[0116] Specifically, whether the first battery 100 and the second battery 200 need to be heated is determined separately. For example, the temperature of the first battery 100 and the second battery 200 can be detected by temperature sensors installed on the first battery 100 and the second battery 200. When the temperature of either the first battery 100 or the second battery 200 is lower than a set temperature threshold, it is determined that it needs to be heated. The temperature of the second battery 200 can refer to the temperature of the first sub-battery pack 210 and the second sub-battery pack 220 as a whole, or it can refer to the temperature of each of the first sub-battery pack 210 and the second sub-battery pack 220.

[0117] S210: When the first battery 100 has a heating requirement, determine whether the first battery 100 and the second battery 200 meet a first preset heating condition.

[0118] Specifically, the first preset heating condition is a condition for the second battery 200 to safely charge the first battery 100. In the embodiment of the present application, the first preset heating condition includes: the remaining power of the first battery 100 is lower than a first power threshold (in which case the first battery 100 does not face an overcharge risk), and the remaining power of the second battery 200 is higher than a second power threshold (in which case the second battery 200 does not face an over-discharge risk); or, the current voltage of the first battery 100 is lower than a first voltage threshold (in which case the first battery 100 does not face an overcharge risk), and the current voltage of the second battery 200 is higher than a second voltage threshold (in which case the second battery 200 does not face an over-discharge risk).

[0119] S211 : When the first battery 100 and the second battery 200 meet a first preset heating condition, controlling the first energy transmission circuit 300 to enable the second battery 200 to charge the first battery 100 .

[0120] Specifically, when the second battery 200 charges the first battery 100, the remaining charge (or voltage) of the second battery 200 cannot be too low to prevent over-discharge, and the remaining charge (or voltage) of the first battery 100 cannot be too high to prevent overcharging. In this embodiment, the first energy transmission circuit 300 is controlled to enable the second battery 200 to charge the first battery 100 only when the first and second batteries 100 meet the first preset heating condition. This effectively prevents overcharging of the first battery 100 and over-discharging of the second battery 200, thereby ensuring the safety of the first battery 100 during the heating process.

[0121] S212: When controlling the first energy transmission circuit 300 to enable the second battery 200 to charge the first battery 100, determine whether the first battery 100 and the second battery 200 meet a first heating exit condition.

[0122] Specifically, the second heating exit condition may be a condition corresponding to the completion of heating of the first battery 100, or a condition corresponding to the presence of a safety risk in the first battery 100 and the second battery 200. In this embodiment, the first heating exit condition includes: the temperature of the first battery 100 reaches a first temperature threshold (i.e., the temperature threshold when the first battery 100 completes heating); or, the remaining power of the first battery 100 reaches a first power threshold (at which point the first battery 100 is at risk of overcharging); or, the remaining power of the second battery 200 reaches a second power threshold (at which point the second battery 200 is at risk of over-discharging); or, the current voltage of the first battery 100 reaches a first voltage threshold (at which point the first battery 100 is at risk of overcharging); or, the current voltage of the second battery 200 reaches a second voltage threshold (at which point the second battery 200 is at risk of over-discharging).

[0123] S213 : When the first battery 100 and the second battery 200 meet the first heating exit condition, the first energy transmission circuit 300 is controlled to enable the second battery 200 to stop charging the first battery 100 .

[0124] Therefore, the battery heating method of this embodiment can immediately stop the heating process when the first battery 100 is heated or there is a safety risk, so as to fully ensure safety.

[0125] S220: When the second battery 200 has a heating demand, determine whether the first battery 100 and the second battery 200 meet the second preset heating condition and the third preset heating condition.

[0126] Specifically, the second preset heating condition is a condition under which the first battery 100 safely charges the second battery 200, and the third preset heating condition is a condition under which the first sub-battery 210 and the second sub-battery 220 safely charge and discharge. In this embodiment, the second preset heating condition includes: the remaining power of the first battery 100 is higher than a third power threshold (at this time, the first battery 100 does not have the risk of over-discharge), and the remaining power of the second battery 200 is lower than a fourth power threshold (at this time, the second battery 200 does not have the risk of over-charge); or, the current voltage of the first battery 100 is higher than a third voltage threshold (at this time, the first battery 100 does not have the risk of over-discharge), and the current voltage of the second battery 200 is lower than a fourth voltage threshold (at this time, the second battery 200 does not have the risk of over-charge). The third preset heating condition includes: the remaining power of the first battery 100 is not higher than the third power threshold (at this time, the first battery 100 has the risk of over-discharge and is not suitable for charging the second battery 200), the remaining power of the first sub-battery 210 is in a first preset power range (at this time, the first sub-battery 210 does not have the risk of over-charge and over-discharge), and the remaining power of the second sub-battery 220 is in a second preset power range (at this time, the second sub-battery 220 does not have the risk of over-charge and over-discharge); or, the current voltage of the first battery 100 is not higher than the third voltage threshold (at this time, the first battery 100 has the risk of over-discharge and is not suitable for charging the second battery 200), the current voltage of the first sub-battery 210 is in a first preset voltage range (at this time, the first sub-battery 210 does not have the risk of over-charge and over-discharge), and the current voltage of the second sub-battery 220 is in a second preset voltage range (at this time, the second sub-battery 220 does not have the risk of over-charge and over-discharge).

[0127] S221: When the first battery 100 and the second battery 200 meet the second preset heating condition, the first energy transmission circuit 300 is controlled to enable the first battery 100 to charge the second battery 200.

[0128] Specifically, when the first battery 100 charges the second battery 200, the remaining power (or voltage) of the first battery 100 cannot be too low to avoid over-discharge, and the remaining power (or voltage) of the second battery 200 cannot be too high to avoid over-charge. In this embodiment, the second energy transmission circuit 400 is controlled to enable the first battery 100 to charge the second battery 200 only when the first battery 100 and the second battery 200 meet the second preset heating condition, which can effectively avoid over-charge of the second battery 200 and over-discharge of the first battery 100, thereby ensuring the safety of the second battery 200 during heating.

[0129] S222: When the first battery 100 charges the second battery 200 by controlling the first energy transmission circuit 300, it is determined whether the first battery 100 and the second battery 200 meet the second heating exit condition.

[0130] Specifically, the second heating exit condition can be a condition corresponding to completion of heating of 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 the embodiment, the second heating exit condition includes: the temperature of the second battery 200 reaching a second temperature threshold (i.e., a temperature threshold when the second battery 200 completes heating); or the remaining power of the first battery 100 reaching a third power threshold (at this time, the first battery 100 exists over-discharge risk); or the remaining power of the second battery 200 reaching a fourth power threshold (at this time, the second battery 200 exists over-charge risk); or the current voltage of the first battery 100 reaching a third voltage threshold (at this time, the first battery 100 exists over-discharge risk); or the current voltage of the second battery 200 reaching a fourth voltage threshold (at this time, the second battery 200 exists over-charge risk).

[0131] S223: When the first battery 100 and the second battery 200 satisfy the second heating exit condition, control the first energy transmission circuit 300 to stop the first battery 100 from charging the second battery 200.

[0132] Therefore, the battery heating method of the embodiment can stop the heating process as soon as the first battery 100 completes heating or a safety risk exists, so as to fully guarantee safety.

[0133] S224: When the first battery 100 and the second battery 200 satisfy the third preset heating condition, control the second energy transmission circuit 400 to make the first sub-battery 210 and the second sub-battery 220 charge and discharge each other.

[0134] Specifically, when the first sub-battery 210 and the second sub-battery 220 charge and discharge each other, the remaining power (or voltage) of the first sub-battery 210 cannot be too high or too low to avoid over-charge or over-discharge, and the remaining power (or voltage) of the second sub-battery 220 cannot be too high or too low to avoid over-charge or over-discharge. The embodiment controls the second energy transmission circuit 400 to make the first sub-battery 210 and the second sub-battery 220 charge and discharge each other only when the first sub-battery 210 and the second sub-battery 220 satisfy the third preset heating condition, which can effectively avoid over-charge and over-discharge of the first sub-battery 210 and the second sub-battery 220, thereby guaranteeing safety during the heating process of the second battery 200.

[0135] S225: When the second energy transmission circuit 400 is controlled to make the first sub-battery 210 and the second sub-battery 220 charge and discharge each other, judge whether the second battery 200 satisfies a third heating exit condition.

[0136] Specifically, the third heating exit condition can be a condition corresponding to completion of heating of the second battery 200, or a condition corresponding to existence of a safety risk of the second battery 200. In this embodiment, the third heating exit condition includes: the temperature of the second battery 200 reaching a third temperature threshold (i.e., a temperature threshold when the second battery 200 completes heating, which can be equal to the second temperature threshold); or, the remaining power of the first sub-battery 210 exceeding a first preset power range (at this time, the first sub-battery 210 exists a risk of over-discharge or over-discharge); or, the remaining power of the second sub-battery 220 exceeding a second preset power range (at this time, the second sub-battery 220 exists a risk of over-charge or over-discharge); or, the current voltage of the first sub-battery 210 exceeding a first preset voltage range (at this time, the first sub-battery 210 exists a risk of over-discharge or over-discharge); or, the current voltage of the second sub-battery 220 exceeding a second preset voltage range (at this time, the second sub-battery 220 exists a risk of over-charge or over-discharge).

[0137] S226: When the second battery 200 satisfies the third heating exit condition, the second energy transmission circuit 400 is controlled to stop the first sub-battery 210 and the second sub-battery 220 from charging and discharging each other.

[0138] Therefore, the battery heating method of this embodiment can stop the heating process as soon as the second battery 200 completes heating or exists a safety risk, so as to fully guarantee the safety of the battery.

[0139] S227: When the first battery 100 and the second battery 200 do not satisfy the first preset heating condition, the second preset heating condition, and the third preset heating condition, step S230 is executed, i.e., other heating methods are used for heating, for example, a heat pump or an electric heater is used to heat the first battery 100 or the second battery 200, so as to meet the heating demand of the first battery 100 or the second battery 200.

[0140] Referring to FIG. 12, the present application 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.

[0141] Referring to FIG. 13, the present application further provides a vehicle 30, which includes the battery heating system 10 as described above and the electronic device 20 as described above. The vehicle can be a pure electric vehicle or a hybrid electric vehicle. In some other embodiments, the vehicle 20 can only include the battery heating system 10 or only include the electronic device 20.

[0142] 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 not limiting of the scope of the application. Those having ordinary skill in the art and access to the present disclosure will recognize additional examples in the present disclosure and practices not presented and described herein. Consequently, many substitutions, alterations, and changes in the examples of the application can be made by those with ordinary skill in the art, and falls within the scope of the application. All such modifications which do not depart from the scope and spirit of the application are intended to be included.

[0143] Those skilled in the art can appreciate that the algorithm steps of the examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Their execution is dependent on the particular applications and the design constraints imposed on the overall system. Skilled persons can use various methods to implement the described functions for each particular application, but such implementation should not be considered beyond the scope of the present application.

[0144] In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to not obscure the understanding of this description.

[0145] Similarly, it is to be understood that the mechanical features of the application can be sub-divided into additional features not specifically described if this will help to more particularly describe one or more of the inventive aspects. In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application can be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been described in detail in order to not obscure the understanding of this description.

[0146] Those skilled in the art can appreciate that all features disclosed in this specification (including the claims, abstract, and drawings) and all processes described in any method or of any apparatus disclosed can be combined in any combination, excepting features mutually exclusive only in that they cannot be simultaneously present in a single embodiment. Unless otherwise indicated, each feature disclosed in this specification (including the claims, abstract, and drawings) can be replaced by alternative features that are both currently known or later developed and that serve the same, equivalent or a similar purpose.

[0147] Furthermore, those skilled in the art will recognize that, in the practice of the embodiments described herein, certain steps described as sequential in nature are actually performed in parallel. Moreover, those skilled in the art will appreciate that the explicit claims hereinafter are indicative of combinations of features that are within the scope of the application and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0148] It is to be understood that the above-referenced examples do not limit the application in scope to the specific embodiments described in this document, but describe embodiments that, together with the claims, define the scope of the application. Those skilled in the art will recognize that other embodiments or changes can be made to the application without departing from the scope of the application, and it is the intent, therefore, to be limited only as described in the following claims.

Claims

1. A battery heating system, wherein, The battery heating system comprises: a first battery; a second battery comprising a first sub-battery and a second sub-battery arranged in series; a first energy transmission circuit connected with the first battery and the second battery, the first battery and the second battery being capable of charging and discharging each other through the first energy transmission circuit; and a second energy transmission circuit connected with the first sub-battery and the second sub-battery, the first sub-battery and the second sub-battery being capable of charging and discharging each other through the second energy transmission circuit.

2. The battery heating system according to claim 1, wherein the first energy transmission circuit and the second energy transmission circuit are both bidirectional DC-DC conversion circuits.

3. The battery heating system according to claim 1, wherein the first energy transmission circuit comprises a first inductor and a first bridge arm; a first end of the first inductor is connected with a positive electrode of the first battery, and a second end of the first inductor is connected with a midpoint of the first bridge arm; and a first end of the first bridge arm is connected with a positive electrode of the first sub-battery, and a second end of the first bridge arm is connected with a negative electrode of the second sub-battery and a negative electrode of the first battery, wherein a negative electrode of the first sub-battery and a positive electrode of the second sub-battery are connected.

4. The battery heating system according to any one of claims 1-3, wherein the second energy transmission circuit comprises a second inductor, a second bridge arm, a first switch and a second switch; a first end of the second inductor is connected with a negative electrode of the first sub-battery, and a second end of the second inductor is connected with a midpoint of the second bridge arm; a first end of the second bridge arm is connected with a positive electrode of the first sub-battery, and a second end of the second bridge arm is connected with a negative electrode of the second sub-battery, wherein a negative electrode of the first sub-battery and a positive electrode of the second sub-battery are connected; the first switch is arranged between the first end of the second bridge arm and the positive electrode of the first sub-battery, or arranged between the negative electrode of the first sub-battery and the positive electrode of the second sub-battery and the first end of the second inductor; the second switch is arranged between the second end of the second bridge arm and the negative electrode of the second sub-battery, or arranged between the positive electrode of the second sub-battery and the negative electrode of the first sub-battery and the first end of the second inductor.

5. The battery heating system according to claim 4, wherein the second inductor is a motor inductor, and the second bridge arm is a bridge arm in a motor controller; the second energy transmission circuit further comprises a third switch, and the first end of the second inductor is connected with the negative electrode of the first sub-battery through the third switch. The battery heating method comprises:

6. A battery heating method, wherein, when a first battery has a heating demand, controlling a first energy transmission circuit to charge the first battery by a second battery; when the second battery has a heating demand, controlling the first energy transmission circuit to charge the second battery by the first battery, or controlling a second energy transmission circuit to charge and discharge a first sub-battery and a second sub-battery with each other. ​ The second battery includes the first sub-battery and the second sub-battery arranged in series, the first energy transmission circuit is connected with the first battery and the second battery, and the second energy transmission circuit is connected with the first sub-battery and the second sub-battery.

7. The battery heating method of claim 6, wherein, when the first battery has a heating demand, the battery heating method further comprises: when the first battery and the second battery satisfy a first preset heating condition, controlling the first energy transmission circuit to cause the second battery to charge the first battery.

8. The battery heating method of claim 7, wherein, the first preset heating condition comprises: a remaining power of the first battery is lower than a first power threshold, and a remaining power of the second battery is higher than a second power threshold; or, a current voltage of the first battery is lower than a first voltage threshold, and a current voltage of the second battery is higher than a second voltage threshold.

9. The battery heating method of claim 8, wherein, when the first energy transmission circuit is controlled to cause the second battery to charge the first battery, the battery heating method further comprises: when the first battery and the second battery satisfy a first heating exit condition, controlling the first energy transmission circuit to cause the second battery to stop charging the first battery.

10. The battery heating method of claim 9, wherein, the first heating exit condition comprises: a temperature of the first battery reaches a first temperature threshold; or, a remaining power of the first battery reaches the first power threshold; or, a remaining power of the second battery reaches the second power threshold; or, a current voltage of the first battery reaches the first voltage threshold; or, a current voltage of the second battery reaches the second voltage threshold.

11. The battery heating method of any one of claims 6-10, wherein, when the second battery has a heating demand, the battery heating method further comprises: when the first battery and the second battery satisfy a second preset heating condition, controlling the first energy transmission circuit to cause the first battery to charge the second battery; when the first battery and the second battery satisfy a third preset heating condition, controlling the second energy transmission circuit to cause the first sub-battery and the second sub-battery to charge and discharge each other.

12. The battery heating method of claim 11, wherein, the second preset heating condition comprises: a remaining power of the first battery is higher than a third power threshold, and a remaining power of the second battery is lower than a fourth power threshold; or, a current voltage of the first battery is higher than a third voltage threshold, and a current voltage of the second battery is lower than a fourth voltage threshold.

13. The battery heating method of claim 11, wherein, the third preset heating condition comprises: a remaining power of the first battery is not higher than the third power threshold, a remaining power of the first sub-battery is in a first preset power range, and a remaining power of the second sub-battery is in a second preset power range; or, a current voltage of the first battery is not higher than a third voltage threshold, a current voltage of the first sub-battery is in a first preset voltage range, and a current voltage of the second sub-battery is in a second preset voltage range. 14.The battery heating method of claim 13, wherein, when the first energy transmission circuit is controlled to enable the first battery to charge the second battery, the battery heating method further comprises: when the first battery and the second battery satisfy a second heating exit condition, the first energy transmission circuit is controlled to stop the first battery from charging the second battery. 15.The battery heating method of claim 14, wherein, the second heating exit condition comprises: a temperature of the second battery reaches a second temperature threshold; or, a remaining electric quantity of the first battery reaches the third electric quantity threshold; or, a remaining electric quantity of the second battery reaches the fourth electric quantity threshold; or, a current voltage of the first battery reaches the third voltage threshold; or, a current voltage of the second battery reaches the fourth voltage threshold. 16.The battery heating method of claim 13, wherein, when the second energy transmission circuit is controlled to enable the first sub-battery and the second sub-battery to charge and discharge each other, the battery heating method further comprises: judging whether the second battery satisfies a third heating exit condition; when the second battery satisfies the third heating exit condition, the second energy transmission circuit is controlled to stop the first sub-battery and the second sub-battery from charging and discharging each other. 17.The battery heating method of claim 16, wherein, the third heating exit condition comprises: a temperature of the second battery reaches a third temperature threshold; or, a remaining electric quantity of the first sub-battery exceeds a first preset electric quantity range; or, a remaining electric quantity of the second sub-battery exceeds a second preset electric quantity range; or, a current voltage of the first sub-battery exceeds a first preset voltage range; or, a current voltage of the second sub-battery exceeds a second preset voltage range.

18. An electronic device for use in the method of any of claims 6-17, 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 of any one of claims 6-17. 19.A vehicle, wherein, comprises the battery heating system of any one of claims 1-5 and / or the electronic device of claim 18.

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