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

Abstract

The invention discloses a battery heating system, a battery heating method, electronic equipment and a vehicle, and the battery heating system comprises a first battery; the second battery comprises a first sub-battery and a second sub-battery which are arranged in series; the first energy transmission circuit is connected with the first battery and the second battery, and the first battery and the second battery can charge and discharge mutually through the first energy transmission circuit; and the second energy transmission circuit is connected with the first sub-battery and the second sub-battery, and the first sub-battery and the second sub-battery can charge and discharge mutually through the second energy transmission circuit. According to the battery heating system, the battery heating method, the electronic equipment and the vehicle, multiple heating modes can be provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery heating system, a battery heating method, an electronic device and a vehicle. BACKGROUND

[0002] 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 is greatly reduced at low temperature. 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.

[0003] At present, the heating method of the battery is to control the back and forth charging and discharging between the battery and the capacitor or the alternating current charging device, so as to generate heat in the battery resistance and heat the battery. The heating method is relatively single, and for multiple batteries, a corresponding charging circuit needs to be configured respectively, and the cost is relatively high.

[0004] Therefore, it is necessary to improve to at least partially solve the above problems. SUMMARY

[0005] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to attempt to limit the key features and necessary technical features of the claimed technical solutions, nor to attempt to determine the protection scope of the claimed technical solutions.

[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 is connected with the first sub-battery and the second sub-battery, and the first sub-battery and the second sub-battery can charge and discharge 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 the first battery has a heating demand, controlling the first energy transmission circuit to cause the second battery to charge the first 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 a 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] the current voltage of the first battery reaches the first voltage threshold; or

[0038] the 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] when the first battery and the second battery meet a second preset heating condition, controlling the first energy transmission circuit to enable the first battery to charge the second battery;

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

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

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

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

[0045] the third preset heating condition comprises:

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

[0047] the current voltage of the first battery is not higher than a third voltage threshold, the current voltage of the first sub-battery is in a first preset voltage range, and the 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] when the first battery and the second battery meet a second heating exit condition, controlling the first energy transmission circuit to enable the first battery to stop charging the second battery.

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

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

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

[0053] the 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] judging 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 stop the first sub-battery and the second sub-battery from 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 electric quantity of the first sub-battery exceeds a first preset electric quantity range; or

[0062] the remaining electric quantity of the second sub-battery exceeds a second preset electric quantity range; or

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

[0064] the current voltage of the second sub-battery exceeds 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, the computer program being executed by the processor to implement the battery heating method as described above.

[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, the first battery and the second battery can charge and discharge each other through the first energy transmission circuit, and the first sub-battery and the second sub-battery can charge and discharge 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 each other to realize self-heating. Therefore, 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 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 the description thereof shown in the drawings are used to explain the devices and principles of the present application. In the drawings,

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

[0070] Figure 2 , 3 It is a schematic diagram of current flow in the process of charging the first battery by the second battery;

[0071] Figure 4 , 5 It is a schematic diagram of current flow in the process of charging the second battery by the first battery;

[0072] Figures 6-9 It is a schematic diagram of current flow in the process of charging and discharging each other by the first sub-battery and the second sub-battery;

[0073] Figure 10 It is a flowchart of the battery heating method according to an embodiment of the present application;

[0074] Figure 11 It is a flowchart of the battery heating method according to an embodiment of the present application;

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

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

[0077] Explanation of reference signs:

[0078] 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;

[0079] 20 - electronic device, 21 - memory, 22 - processor;

[0080] 30 - vehicle. DETAILED DESCRIPTION

[0081] In the following description, numerous specific details are set forth to provide a more thorough understanding of the present application. However, it will be apparent to one of skill in the art upon

[0082] It should be understood that the present application can be carried out in different forms without departing from the spirit of the application. The application is described below with reference to the drawings, in which like elements are numbered the same, and in which the various elements are not necessarily drawn to scale. The following terms are used throughout the description and claims: "first", "second", and "third" are used to identify elements of like reference numbers in different embodiments.

[0083] 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 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.

[0084] 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.

[0085] 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.

[0086] Reference is made to the drawings in whichFigure 1 The battery heating system 10 according to an embodiment of the present application is exemplarily described.

[0087] 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.

[0088] 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 (i.e. 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 (i.e. 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 (i.e. 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 (i.e. the second battery 200) to heat the second battery 200.

[0089] 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 sub-battery 210 to heat the first sub-battery 210, thereby realizing the heating of the first sub-battery 210 and the second sub-battery 220, i.e. realizing the self-heating of the second battery 200.

[0090] The battery heating system 10 of the present 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 the self-heating of the second battery 200, which can effectively realize the heating of the first battery 100 or the second battery 200, and has simple structure and relatively low cost.

[0091] The battery heating system 10 of the present application can be a battery heating system for 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) for the vehicle respectively, so that the battery heating system 10 of the present application can heat the batteries by using the existing batteries of the vehicle without relying on external charging equipment. The battery heating system 10 of the present application can also be applied to other electronic devices other than vehicles.

[0092] In the present 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 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. The second energy transmission circuit 400 can convert the voltage 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 some 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, and 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.

[0093] Referring to FIG. 1, the battery heating system 10 of the present application includes a first battery 100, a second battery 200, a first energy transmission circuit 300 and a second energy transmission circuit 400. Figure 1 In the present 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 being a switch Q1 and the lower bridge arm being a switch Q2. The first end of the first inductor is connected to the positive electrode of the first battery 100, and the second end of the first inductor 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 first sub-battery 210, and the second end of the first bridge arm is connected to the negative electrode of the second sub-battery 220 and the negative electrode of the first battery 100, wherein 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.

[0094] In some 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 connected to the positive pole of the first battery 100, and the second ends of the plurality of first inductors L1 are connected to the midpoint of the first bridge arm. The first end of the first bridge arm is connected to the positive pole of the first sub-battery 210, and the second end of the first bridge arm is connected to the negative pole of the second sub-battery 220 and the negative pole of the first battery 100.

[0095] In some 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 connected to the positive pole of the first battery 100, and the second ends of the plurality of first inductors L1 are connected to the midpoint of the first bridge arm. The first end of the first bridge arm is connected to the positive pole of the first sub-battery 210, and the second end of the first bridge arm is connected to the negative pole of the second sub-battery 220 and the negative pole of the first battery 100.

[0096] In some 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 connected to the positive pole of the first battery 100, and the second ends of the plurality of first inductors L1 are connected to the midpoint of the first bridge arm. The first end of the first bridge arm is connected to the positive pole of the first sub-battery 210, and the second end of the first bridge arm is connected to the negative pole of the second sub-battery 220 and the negative pole of the first battery 100.

[0097] Referring to the accompanying drawings Figure 2 3 The process of controlling the first energy transmission circuit 300 to charge the second battery 200 with the first battery 100 is described. First, referring to the accompanying drawings Figure 2 , 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 second battery 200 flows into the first battery 100 through the switch tube Q1 and the first inductor L1 in turn, the second battery 200 is discharged, the first battery 100 is charged, and the first inductor L1 is charged. Then, referring to the accompanying drawings Figure 3 , the upper bridge arm of the first bridge arm is turned off, and the lower bridge arm is turned on. 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. Repeat the above process, control the upper and lower bridge arms to turn on alternately, the second battery 200 can be discharged to the first battery 100 through the step-down circuit composed of the first inductor L1 and the first bridge arm, to generate heat with the internal resistance of the first battery 100, to achieve the purpose of heating the first battery 100 while charging. After the first battery 100 completes heating, 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.

[0098] Referring to the accompanying drawings Figure 4 ​、 5 The process of controlling the first energy transmission circuit 300 to enable the second battery 200 to charge the first battery 100 is described. Figure 4 , control the lower bridge arm of the first bridge arm to be turned on, the upper bridge arm to be 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, see the attached Figure 5 , the upper arm of the first bridge arm is controlled to be conductive, while the lower arm is disconnected. The current output by the first battery 100 flows into the second battery 200 through the first inductor L1 and the switch tube Q1 in sequence, causing the first battery 100 and the first inductor L1 to discharge, while the second battery 200 is charged. Repeating the above process, the upper and lower bridge arms are controlled to be alternately conductive. The first battery 100 can provide unidirectional pulse discharge to the second battery 200 through the boost circuit composed of the first inductor L1 and the first bridge arm, generating heat through the internal resistance of the second battery 200, thereby achieving the purpose of simultaneously charging and heating the second battery 200. After the second battery 200 is heated, the upper and lower arms of the first bridge arm can be controlled to be disconnected, so that the second battery 200 stops charging the first battery 100.

[0099] 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.

[0100] In the embodiment, the second inductor L2 is a motor inductor, and the second 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 are used as part of the second energy transmission circuit 400, and no additional inductor and bridge arm are needed, which can effectively reduce the cost. In the embodiment, the second energy transmission circuit 400 further includes a third switch K3, and the first end of the second inductor is connected to the negative electrode of the first sub-battery 210 through the third switch K3. Therefore, when the motor is working normally, the third switch K3 can be turned off to avoid mutual charging and discharging of the first sub-battery 210 and the second sub-battery 220; and when the motor is not working, the third switch K3 can be turned on to realize mutual charging and discharging of the first sub-battery 210 and the second sub-battery 220.

[0101] In some other embodiments, the second energy transmission circuit 400 can 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 first switch K1 and the second switch K2 are arranged in the same way as in the above embodiment, which will not be repeated here.

[0102] In some other embodiments, the second energy transmission circuit 400 can include a second inductor L2, a plurality of 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 connected to the midpoints of the plurality of second bridge arms, the first ends of the plurality of second bridge arms are connected to the positive electrode of the first sub-battery 210, and the second ends of the plurality of second bridge arms are connected to the negative electrode of the second sub-battery 220. The first switch K1 and the second switch K2 are arranged in the same way as in the above embodiment, which will not be repeated here.

[0103] In some other embodiments, the second energy transmission circuit 400 can include a plurality of second inductors L2, a second bridge arm, a first switch K1 and a second switch K2. The first ends of the plurality of second inductors L2 are connected to the negative electrode of the first sub-battery 210, the second ends of the plurality of second inductors L2 are connected to the midpoints of the plurality of 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 first switch K1 and the second switch K2 are arranged in the same way as in the above embodiment, which will not be repeated here.

[0104] Referring to the accompanying drawings Figures 6-9 The process of controlling the first energy transmission circuit 300 to charge the first battery 100 by the second battery 200 will be described. First, referring to the accompanyingFigure 6 , control the first switch K1 and the third switch K3 to be turned on, the second switch K2 to be turned off, the upper bridge arm of the second bridge arm to be turned on, and the lower bridge arm to be 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, see the attached Figure 7 , control the first switch K1 to be turned off, the second switch K2 and the third switch K3 to be turned on, the lower bridge arm of the second bridge arm to be turned on, the upper bridge arm to be turned off, the current output by the second inductor L2 to flow into the second sub-battery 220, the second inductor L2 to be discharged, and the second sub-battery 220 to be charged; then, see the attached Figure 8 , control the first switch K1 to be off, the second switch K2 and the third switch K3 to be on, the lower arm of the second bridge arm to be on, and the upper arm to be off, adjust the duty cycle of the switch tube Q4 so that the current output by the second sub-battery 220 flows into the second inductor L2, the second sub-battery 220 is discharged, and the second inductor L2 is charged; then, see the attached Figure 9 , controlling the first switch K1 and the third switch K3 to conduct, the second switch K2 to disconnect, the upper arm of the second bridge arm to conduct, and the lower arm to disconnect, the current output by the second inductor L2 to flow into the first sub-battery 210, the second inductor L2 to discharge, and the first sub-battery 210 to charge. 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 battery, the current passing through the first sub-battery 210 and the second sub-battery 220 will generate heat, thereby achieving the purpose of self-heating of the second sub-battery 200. After the second battery 200 is heated, the upper and lower arms of the second bridge arm can be controlled to disconnect, so that the first sub-battery 210 and the second sub-battery 220 stop charging and discharging each other.

[0105] 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.

[0106] In the embodiment, the battery heating system 10 further comprises a switch K4 and a switch K5, a first end of the switch K4 is connected with the positive electrode of the first battery 100, a second end of the switch K4 is used to be connected with the positive electrode output end of the charging pile 600 (for example, the second end of the switch K4 can be connected to the positive electrode terminal in the charging port on the vehicle), a first end of the switch K5 is connected with the positive electrode of the first sub-battery 210, a second end of the switch K5 is used to be connected with the positive electrode output end of the charging pile 600 (for example, the second end of the switch K5 can be connected to the positive electrode terminal in 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 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 sub-battery 220 can be connected to the negative electrode terminal in 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.

[0107] Referring to the accompanying drawings Figure 10 The application further provides a battery heating method applied to a battery heating system, the battery heating system comprising a first battery, a second battery, a first energy transmission circuit and a second energy transmission circuit, the second battery comprising a first sub-battery and a second sub-battery arranged in series, the first energy transmission circuit being connected with the first battery and the second battery, and the second energy transmission circuit being connected with the first sub-battery and the second sub-battery. The first battery and the second battery can charge and discharge each other through the first energy transmission circuit, and the first sub-battery and the second sub-battery can charge and discharge each other through the second energy transmission circuit.

[0108] Exemplarily, the battery heating system can be the battery heating system 10 in the above embodiment. Accordingly, the battery heating method comprises:

[0109] S100: determining whether the first battery 100 and the second battery 200 have heating demands.

[0110] Specifically, it is determined whether the first battery 100 and the second battery 200 have heating demands respectively. For example, 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 when the temperature of any one of the first battery 100 and the second battery 200 is lower than the set temperature threshold, it is determined that the any one has a heating demand.

[0111] S110: when the first battery 100 has a heating demand, controlling the first energy transmission circuit 300 to make the second battery 200 charge the first battery 100.

[0112] Specifically, the specific process of controlling the first energy transmission circuit 300 to make the second battery 200 charge the first battery 100 is specifically described in the above embodiment, and will not be repeated here. The second battery 200 charging the first battery 100 can generate heat with the internal resistance of the first battery 100, achieving the purpose of heating the first battery 100 while charging.

[0113] S120: When the second battery 200 has a heating demand, control the first energy transmission circuit 300 to make the first battery 100 charge the second battery 200, or 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.

[0114] Specifically, the specific process of controlling the first energy transmission circuit 300 to make the first battery 100 charge the second battery 200 and the specific process of controlling the second energy transmission circuit 400 to make the first sub-battery 210 and the second sub-battery 220 charge and discharge each other have been specifically described in the above embodiment, and will not be repeated here. The first battery 100 charging the second battery 200 and the first sub-battery 210 and the second sub-battery 220 charging and discharging each other can all generate heat with the internal resistance of the second battery 200, achieving the heating of the second battery 200.

[0115] According to the battery heating method of the embodiment, multiple heating modes are provided, especially when the second battery 200 has a heating demand, two independent heating modes are provided, which can be redundant to each other, to effectively meet the heating demand of the second battery 200.

[0116] Referring to the accompanying drawings, Figure 11 The application also provides a battery heating method applied to the battery heating system 10 in the above embodiment, and the battery heating method comprises:

[0117] S200: Determine whether the first battery 100 and the second battery 200 have a heating demand.

[0118] Specifically, whether the first battery 100 and the second battery 200 have a heating demand is determined respectively, for example, 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 when the temperature of any one of the first battery 100 and the second battery 200 is lower than the set temperature threshold, it is determined that it has a heating demand. The temperature of the second battery 200 can be the temperature of the first sub-battery 210 pack and the second sub-battery 220 pack as a whole, or can refer to the temperature of the first sub-battery 210 pack and the second sub-battery 220 pack respectively.

[0119] S210: When the first battery 100 has a heating demand, determine whether the first battery 100 and the second battery 200 meet the first preset heating condition.

[0120] Specifically, the first preset heating condition is a necessary condition for the second battery 200 to safely charge the first battery 100. In the embodiments of the present application, the first preset heating condition includes: the remaining power of the first battery 100 is lower than the first power threshold (at this time, the first battery 100 has no overcharge risk), and the remaining power of the second battery 200 is higher than the second power threshold (at this time, the second battery 200 has no overdischarge risk); or, the current voltage of the first battery 100 is lower than the first voltage threshold (at this time, the first battery 100 has no overcharge risk), and the current voltage of the second battery 200 is higher than the second voltage threshold (at this time, the second battery 200 has no overdischarge risk).

[0121] S211: When the first battery 100 and the second battery 200 meet the first preset heating condition, control the first energy transmission circuit 300 to charge the first battery 100 by the second battery 200.

[0122] Specifically, when the second battery 200 charges the first battery 100, the remaining power (or voltage) of the second battery 200 cannot be too low to avoid overdischarge, and the remaining power (or voltage) of the first battery 100 cannot be too high to avoid overcharge. In the embodiments of the present application, the first energy transmission circuit 300 is controlled to charge the first battery 100 by the second battery 200 only when the first battery 100 and the second battery 200 meet the first preset heating condition, which can effectively avoid overcharge of the first battery 100 and overdischarge of the second battery 200, thereby ensuring the safety of the first battery 100 during the heating process.

[0123] S212: When the first energy transmission circuit 300 is controlled to charge the first battery 100 by the second battery 200, determine whether the first battery 100 and the second battery 200 meet the second heating exit condition.

[0124] Specifically, the second heating exit condition can be a condition corresponding to completion of heating of the first battery 100, or a condition corresponding to existence of a safety risk of 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 reaching a first temperature threshold (i.e., a temperature threshold when the first battery 100 completes heating); or, the remaining power of the first battery 100 reaching a first power threshold (at this time, the first battery 100 exists a risk of overcharging); or, the remaining power of the second battery 200 reaching a second power threshold (at this time, the second battery 200 exists a risk of overdischarging); or, the current voltage of the first battery 100 reaching a first voltage threshold (at this time, the first battery 100 exists a risk of overcharging); or, the current voltage of the second battery 200 reaching a second voltage threshold (at this time, the second battery 200 exists a risk of overdischarging).

[0125] S213: When the first battery 100 and the second battery 200 satisfy the first heating exit condition, the first energy transmission circuit 300 is controlled to stop the second battery 200 from charging the first battery 100.

[0126] Therefore, the battery heating method of this 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.

[0127] S220: When the second battery 200 exists a heating demand, it is judged whether the first battery 100 and the second battery 200 satisfy the second preset heating condition and the third preset heating condition.

[0128] Specifically, the second preset heating condition is a necessary condition for the first battery 100 to safely charge the second battery 200, and the third preset heating condition is a necessary condition for the first sub-battery 210 and the second sub-battery 220 to safely charge and discharge. In this embodiment, the second preset heating condition includes: the remaining power of the first battery 100 is higher than the 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 the 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 the 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 the 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 the 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 the 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 the 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 the second preset voltage range (at this time, the second sub-battery 220 does not have the risk of over-charge and over-discharge).

[0129] S221: When the first battery 100 and the second battery 200 meet the second preset heating condition, control the first energy transmission circuit 300 to enable the first battery 100 to charge the second battery 200.

[0130] 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 battery 200 is charged by the first battery 100 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.

[0131] S222: When the first battery 100 charges the second battery 200 by controlling the first energy transmission circuit 300, determine whether the first battery 100 and the second battery 200 meet the second heating exit condition.

[0132] 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).

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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 the 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 has 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 has 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 has 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 has a risk of over-charge or over-discharge).

[0139] S226: When the second battery 200 meets 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.

[0140] Therefore, the battery heating method of the embodiment can stop the heating process as soon as the second battery 200 completes heating or a safety risk exists, so as to fully guarantee the safety of the battery.

[0141] S227: When the first battery 100 and the second battery 200 do not meet the first preset heating condition, the second preset heating condition, and the third preset heating condition, 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.

[0142] Referring to FIG. 1, Figure 12 The 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.

[0143] Referring to FIG. 1, Figure 13 The 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 include only the battery heating system 10 or only the electronic device 20.

[0144] Although example embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the example embodiments are only exemplary and are not intended to limit the scope of the present application. Those of ordinary skill in the art can make various changes and modifications of the example embodiments without departing from the scope and spirit of the present application. All such changes and modifications are intended to be within the scope of the present application as claimed.

[0145] Those skilled in the art can realize the units and algorithm steps with the examples described in the embodiments disclosed herein can be realized in electronic hardware, or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the particular applications and design constraints of the technical solution. Those skilled in the art can realize the described functions by different methods for each particular application, but such implementation should not be considered to be beyond the scope of the present application.

[0146] 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 device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, another division manner can be used, 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.

[0147] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the present 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.

[0148] Similarly, it should be appreciated that the various features of the application described herein can be implemented in any of a variety of different embodiments. The various embodiments disclosed herein can be combined in different combinations, and each individual feature can be implemented independently of all other features. In addition, the various embodiments can be implemented in any of a variety of different ways. Similarly, it should be understood that, in the description of example embodiments of the application, various features of the application are sometimes grouped together in a single embodiment, figure, or description of related features. This method of disclosure, however, is not to be interpreted as reflecting an intention that the application requires more features than are explicitly recited in each claim. Rather, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim acting as a separate embodiment of the application. The claims are not to be construed as reflecting an intention that the application requires more features than are explicitly recited in each claim.

[0149] 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 replaced by alternative features serving the same, equivalent or similar purposes, unless expressly stated otherwise. Each feature disclosed in this specification, including any accompanying claims, abstract and drawings, can be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

[0150] Furthermore, those skilled in the art will recognize that references in this specification to particular embodiments can be taken to mean alternative embodiments unless expressly stated otherwise. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0151] It is noted that the foregoing examples have been provided merely for the purposes of illustration and are not intended to limit the application under the appended claims, which are to be construed as including all equivalents to the examples described herein.

Claims

1. A battery heating system, characterized by, 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; 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 claim 1, 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, characterized by, 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. ​ 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:

8. The battery heating method of claim 7, wherein when the first battery and the second battery satisfy a first preset heating condition, the battery heating method further comprises:

9. The battery heating method of claim 8, wherein when the first energy transmission circuit is controlled to enable the second battery to charge the first battery, the battery heating method further comprises:

10. The battery heating method of claim 9, wherein the first heating exit condition comprises:

11. The battery heating method of claim 6, wherein when the second battery has a heating demand, the battery heating method further comprises:

12. The battery heating method of claim 11, wherein the second preset heating condition comprises:

13. The battery heating method of claim 11, wherein when the first battery and the second battery satisfy a third preset heating condition, the battery heating method further comprises:

14. The battery heating method of claim 13, wherein the third preset heating condition comprises:

15. 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:

16. The battery heating method of claim 15, wherein the third preset heating condition comprises:

17. The battery heating method of claim 15, 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:

18. The battery heating method of claim 17, wherein the third preset heating condition comprises:

19. The battery heating method of claim 17, 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:

20. The battery heating method of claim 19, wherein the third preset heating condition comprises:

21. The battery heating method of claim 19, 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:

22. The battery heating method of claim 21, wherein the third preset heating condition comprises:

23. The battery heating method of claim 21, 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:

24. The battery heating method of claim 23, wherein the third preset heating condition comprises:

25. The battery heating method of claim 23, 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:

26. The battery heating method of claim 25, wherein the third preset heating condition comprises:

27. The battery heating method of claim 25, 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:

28. The battery heating method of claim 27, wherein the third preset heating condition comprises:

29. The battery heating method of claim 27, 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:

30. The battery heating method of claim 29, wherein the third preset heating condition comprises:

31. The battery heating method of claim 29, 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:

32. The battery heating method of claim 31, wherein the third preset heating condition comprises:

33. The battery heating method of claim 31, 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:

34. The battery heating method of claim 33, wherein the third preset heating condition comprises:

35. The battery heating method of claim 33, 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:

36. The battery heating method of claim 35, wherein the third preset heating condition comprises:

37. The battery heating method of claim 35, 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:

38. The battery heating method of claim 37, wherein the third preset heating condition comprises:

39. The battery heating method of claim 37, 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:

40. The battery heating method of claim 39, wherein the third preset heating condition comprises:

41. The battery heating method of claim 39, 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:

42. The battery heating method of claim 41, wherein the third preset heating condition comprises:

43. The battery heating method of claim 41, 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:

44. The battery heating method of claim 43, wherein the third preset heating condition comprises:

45. The battery heating method of claim 43, 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:

46. The battery heating method of claim 45, wherein the third preset heating condition comprises:

47. The battery heating method of claim 45, 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:

48. The battery heating method of claim 47, wherein the third preset heating condition comprises:

49. The battery heating method of claim 47, 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:

50. The battery heating method of claim 49, wherein the third preset heating condition comprises:

51. The battery heating method of claim 49, 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:

52. The battery heating method of claim 51, wherein the third preset heating condition comprises:

53. The battery heating method of claim 51, 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:

54. The battery heating method of claim 53, wherein the third preset heating condition comprises:

55. The battery heating method of claim 53, 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:

56. The battery heating method of claim 55, wherein the third preset heating condition comprises:

57. The battery heating method of claim 55, 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:

58. The battery heating method of claim 57, wherein the third preset heating condition comprises:

59. The battery heating method of claim 57, 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:

60. The battery heating method of claim 59, wherein the third preset heating condition comprises:

61. The battery heating method of claim 59, 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:

62. The battery heating method of claim 61, wherein the third preset heating condition comprises:

63. The battery heating method of claim 61, 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:

64. The battery heating method of claim 63, wherein the third preset heating condition comprises:

65. The battery heating method of claim 63, 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:

66. The battery heating method of claim 65, wherein the third preset heating condition comprises:

67. The battery heating method of claim 65, 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:

68. The battery heating method of claim 67 The current voltage of the first battery is not higher than a third voltage threshold, the current voltage of the first sub-battery is in a first preset voltage range, and the current voltage of the second sub-battery is in a second preset voltage range.

13. The battery heating method of claim 12, 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.

14. The battery heating method of claim 13, wherein, the second heating exit condition comprises: a temperature of the second battery reaches a second temperature threshold; or, a remaining power of the first battery reaches the third power threshold; or, a remaining power of the second battery reaches the fourth power 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.

15. The battery heating method of claim 12, 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: determining 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.

16. The battery heating method of claim 15, wherein, the third heating exit condition comprises: a temperature of the second battery reaches a third temperature threshold; or, a remaining power of the first sub-battery is out of a first preset power range; or, a remaining power of the second sub-battery is out of a second preset power range; or, a current voltage of the first sub-battery is out of a first preset voltage range; or, a current voltage of the second sub-battery is out of a second preset voltage range.

17. An electronic device comprising a memory, a processor, and a computer program stored in the memory, characterized in that: The computer program is executed by the processor to implement the battery heating method of any one of claims 6-16.

18. A vehicle, comprising: the battery heating system of any one of claims 1-5 and / or the electronic device of claim 17.

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