Battery heating equipment, battery management system, battery pack and power-consuming device

Abstract

The embodiment of the present application provides a battery heating device, a battery management system, a battery pack and an electrical device, wherein the battery heating device comprises: a heating module for heating the battery cell module of the battery pack; a first switch module, wherein the heating module and the first switch module are connected in series between the first power terminal and the second power terminal; a microcontroller unit for alternately outputting a first signal and a second signal; a first control circuit, electrically connected between the microcontroller unit and the first switch module; the first control circuit is used to send a first reference signal to the first switch module upon receiving the first signal, so as to turn on the first switch module; wherein the first switch module is used to maintain conduction when the microcontroller unit outputs the second signal. According to the embodiment of the present application, the first switch module can be stably controlled to be turned on by the signal output by the microcontroller unit, and the first switch module will not malfunction under other interference signals, thereby improving the stability and reliability of battery heating.

Description

Battery heating equipment, battery management system, battery pack and power consumption device Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery heating device, a battery management system, a battery pack, and an electrical device. Background Art

[0002] With the development of new energy technologies, batteries are increasingly being used. Because battery pack performance is affected by temperature, the charging and discharging efficiency of battery packs decreases significantly at low temperatures. Therefore, when the battery pack temperature does not meet operational requirements, it is necessary to heat the battery pack to its operating temperature range.

[0003] To achieve battery pack heating, a heating module is typically installed next to the battery pack. When the battery pack is connected to a charging device, the charging device powers the heating module to heat the battery pack. However, existing heating modules are susceptible to interference signals and can malfunction, significantly reducing the stability and reliability of the heating function.

[0004] Summary of the Invention

[0005] The present application provides a battery heating device, a battery management system, a battery pack and an electrical device to improve the stability and reliability problems of existing battery pack heating modules.

[0006] According to a first aspect of an embodiment of the present application, an embodiment of the present application provides a battery heating device, comprising: a heating module for heating a cell module of a battery pack; a first switch module comprising a first switch, the heating module and the first switch module being connected in series between a first power terminal and a second power terminal; a microcontroller unit configured to alternately output a first signal and a second signal of high and low levels; a first control circuit electrically connected between the microcontroller unit and the first switch module; wherein the first control circuit is configured to respond to the first signal to turn on the first switch module; wherein the first switch module remains turned on when the microcontroller unit outputs the second signal. The microcontroller unit being configured to alternately output the first signal and the second signal of high and low levels means that the first signal and the second signal are alternately output, the first signal is a high level or a low level, and the level of the second signal is opposite to that of the first signal.

[0007] In some embodiments, the first control circuit includes: a second switch and a third switch, the second switch and the third switch are connected in series between the output end of the voltage input source and the ground, and the second switch is also electrically connected to the first switch module; a first capacitor and a first resistor, the first capacitor and the first resistor are connected in series between the control end of the third switch and the microcontroller unit; a second resistor, electrically connected between the control end of the second switch and the voltage input source; the voltage input source is used to power the first control circuit.

[0008] In some embodiments, the first control circuit further includes a third resistor and a fourth resistor, the third resistor being electrically connected between the control terminal of the third switch and ground, and the fourth resistor being electrically connected between the second switch and the third switch.

[0009] In some embodiments, the first control circuit further includes a Schottky diode and a fifth resistor, and the Schottky diode and the fifth resistor are electrically connected between the second switch and the first switch module.

[0010] In some embodiments, the first switch module further includes: a first voltage-dividing resistor and a second voltage-dividing resistor, the first voltage-dividing resistor and the second voltage-dividing resistor being connected in series between the first control circuit and the first switch; and an energy storage capacitor connected in parallel with the second voltage-dividing resistor, for releasing charge to maintain the first switch on when the microcontroller unit outputs the second signal.

[0011] In some embodiments, the microcontroller unit alternately outputs a first signal of high and low levels and a second signal as a PWM signal, and the duration of the second signal is less than or equal to the first duration.

[0012] In some embodiments, the battery heating device further includes: a fourth switch module connected in series with the heating module and the first switch module between the first power terminal and the second power terminal.

[0013] In some embodiments, the first switch module is a transistor, and the fourth switch module is a relay.

[0014] In some embodiments, the battery heating device further includes: a fifth switch, the fifth switch and the fourth switch module are connected in series between the first power terminal and the second power terminal; the first switch module, the fourth switch module and the fifth switch are all transistors.

[0015] In some embodiments, the fourth switch module further includes: a third voltage-dividing resistor and a fourth voltage-dividing resistor, and the third voltage-dividing resistor and the fourth voltage-dividing resistor are connected in series between the fourth switch module, the fifth switch, and the first control circuit.

[0016] In some embodiments, the battery heating device further includes: a second control circuit electrically connected between the fourth switch module and the fifth switch and the first control circuit; wherein the second control circuit is configured to be able to respond to the first signal to turn on the fourth switch module and the fifth switch.

[0017] In some embodiments, the first power terminal is at least one of a positive discharge terminal or a positive charge terminal, and the second power terminal is at least one of a negative discharge terminal or a negative charge terminal.

[0018] In some embodiments, the battery heating device further includes: a first temperature measuring element electrically connected to the micro control unit, and configured to detect the temperature of the first switch module and / or the temperature of the fourth switch module.

[0019] In some embodiments, the battery heating device further includes a connector, and the heating module includes a heating film; the connector is electrically connected to the heating film, and the connector and the heating film are electrically connected between the first power terminal and the second power terminal.

[0020] In some embodiments, the battery heating device further includes: a second temperature measuring element electrically connected to the connector and configured to detect the temperature of the heating film; and the connector and the second temperature measuring element are electrically connected to the microcontroller unit.

[0021] In some embodiments, the battery heating device further includes: a fuse electrically connected between the first power terminal and the second power terminal.

[0022] According to a second aspect of an embodiment of the present application, an embodiment of the present application provides a battery management system, including the above battery heating device.

[0023] According to the third aspect of the embodiments of the present application, the embodiments of the present application provide a battery pack, including a battery cell module and the battery management system as described above, wherein the battery cell module includes at least one battery cell; and the battery management system is electrically connected to the battery cell module.

[0024] According to a fourth aspect of an embodiment of the present application, an embodiment of the present application provides an electrical device comprising the battery pack as described above.

[0025] According to the battery heating device, battery management system, battery pack, and power-consuming device provided in the embodiments of the present application, a microcontroller unit is configured to alternately output a first signal and a second signal of high and low levels to drive the first switch module to conduct, enabling the heating module to heat the cell modules of the battery pack. The first switch module will not malfunction when receiving interference signals other than the alternating signal, thereby improving the stability and reliability of battery heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application.

[0027] FIG1 is a schematic structural diagram of a battery heating device provided in one embodiment of the present application;

[0028] FIG2 is a schematic diagram of the circuit structure of a battery heating device provided in one embodiment of the present application;

[0029] FIG3 is a schematic diagram of the circuit structure of a first control circuit provided in an embodiment of the present application;

[0030] FIG4 is a schematic structural diagram of a battery heating device provided in another embodiment of the present application;

[0031] FIG5 is a schematic structural diagram of a battery heating device provided in another embodiment of the present application;

[0032] FIG6 is a schematic diagram of the circuit structure of a battery heating device provided in another embodiment of the present application;

[0033] FIG7 is a schematic structural diagram of a battery heating device provided in yet another embodiment of the present application;

[0034] FIG8 is a schematic structural diagram of a battery heating device provided in another embodiment of the present application;

[0035] FIG9 is a schematic structural diagram of a battery heating device provided in yet another embodiment of the present application;

[0036] FIG10 is a schematic structural diagram of a battery heating device provided in another embodiment of the present application;

[0037] FIG11 is a schematic structural diagram of a battery heating device provided in yet another embodiment of the present application;

[0038] FIG12 is a schematic structural diagram of a battery management system provided in one embodiment of the present application;

[0039] FIG13 is a schematic structural diagram of a battery management system provided in another embodiment of the present application.

[0040] In the attached figure:

[0041] 10. Heating module; 11. Connector; 12. Heating film; 20. First switch module; Q1. First switch; Q2. Second switch; Q3. Third switch; 21. Fourth switch module; 22. Fifth switch; 23. Charging switch; 24. Discharging switch; 30. Microcontroller unit; 40. First control circuit; 41. Second control circuit; 50. Battery cell module; C+, positive charging terminal; C-, negative charging terminal; P+, positive discharge terminal; P-, negative discharge terminal; F1, fuse; NTC1, first temperature measuring element; NTC2, second temperature measuring element; NTC3, third temperature measuring element; C1, first capacitor; energy storage capacitor Ca; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; D1, Schottky diode; Ra, first voltage-dividing resistor; Ra1, second voltage-dividing resistor; Rb, third voltage-dividing resistor; Rb1, fourth voltage-dividing resistor. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0043] The embodiments of the present application provide a battery heating device, a battery management system, a battery pack, and an electrical device. The specific implementation of the embodiments of the present application is further described below with reference to the accompanying drawings.

[0044] Battery heating equipment

[0045] FIG1 shows a schematic diagram of the module structure of a battery heating device provided by an embodiment of the present application. As shown in FIG1 , the battery heating device includes a heating module 10 , a first switch module 20 , a micro control unit 30 and a first control circuit 40 .

[0046] As shown in FIG. 2 , the first switch module 20 may include a first switch Q1 as a controllable switch, and the first switch Q1 may be a transistor.

[0047] The heating module 10 is capable of heating the cell modules 50 of the battery pack. The heating module 10 and the first switch module 20 can be connected in series between the first power terminal V1 and the second power terminal V2. The microcontroller unit 30 can alternately output a first signal and a second signal. The first signal can be a high-level signal, and the second signal can be a low-level signal. The first control circuit 40 is electrically connected between the microcontroller unit 30 and the first switch module 20. Upon receiving the first signal from the microcontroller unit 30, the first control circuit 40 can output a first reference signal to the first switch module 20. The first switch module 20 can then be turned on upon receiving the first reference signal. In one specific embodiment, the first control circuit 40 can connect or disconnect a voltage input source to the control terminal of the first switch module 20. When the voltage input source is connected to the control terminal of the first switch module 20, the voltage input source can output a voltage signal to the first switch module 20, thereby turning the first switch module 20 on. It is understood that the voltage signal output from the voltage input source to the first switch module 20 can be 12V.

[0048] The first switch module 20 can also remain on when the microcontroller unit 30 outputs the second signal. That is, when the microcontroller unit 30 alternately outputs the first signal and the second signal, the first switch module 20 can remain on. The first switch module 20 can include a transistor, which can be a triode, a FET (Field Effect Transistor), or the like. As shown in Figure 2, taking the first switch module 20 including a MOS-FET Q1 as an example, when the first switch Q1 is a MOS-FET, the control terminal of the first switch Q1 is the gate of the MOS-FET, and the two ends of the first switch Q1 are the source and drain of the MOS-FET, respectively. The first switch module 20 can also include an energy storage capacitor Ca, one end of the energy storage capacitor Ca being electrically connected to the gate of the first switch Q1 and the other end being electrically connected to the source or drain of the first switch Q1. When the microcontroller unit 30 outputs the first signal, the first control circuit 40 can output a first reference signal to the first switch module 20. This first reference signal, when driving the first switch Q1 to conduct, can also charge the energy storage capacitor Ca. When the microcontroller unit 30 outputs the second signal, the energy storage capacitor Ca can discharge the charge stored during the charging process. During this discharge process, the voltage difference between the gate and source of the MOS-FET will gradually decrease. As the voltage difference between the gate and source of the MOS-FET gradually decreases, if the voltage difference is greater than the MOS-FET's turn-on threshold voltage, the MOS-FET will remain in the on state until the voltage difference drops below the MOS-FET's turn-on threshold voltage. That is, when the microcontroller unit 30 outputs the second signal, the energy storage capacitor Ca can discharge the charge, allowing the MOS-FET to remain in the on state for a certain period of time.

[0049] When the first switch module 20 includes a MOS-FET, the MOS-FET conduction condition is that the voltage difference between the gate and the source satisfies the MOS-FET's turn-on threshold voltage. As shown in FIG2 , the first switch module 20 further includes a first voltage-dividing resistor Ra and a second voltage-dividing resistor Ra1. The first voltage-dividing resistor Ra has its two ends connected to the gate and source of the MOS-FET, respectively, and the second voltage-dividing resistor Ra1 is electrically connected between the gate of the MOS-FET and the first control circuit 40. The first voltage-dividing resistor Ra and the second voltage-dividing resistor Ra1 can form a voltage-dividing circuit. When a first reference signal is received, the voltage across the first voltage-dividing resistor Ra is the voltage difference between the gate and the source of the MOS-FET. By setting the resistance values ​​of the first voltage-dividing resistor Ra and the second voltage-dividing resistor Ra1 so that the voltage across the first voltage-dividing resistor Ra satisfies the turn-on threshold voltage when the first control circuit 40 outputs the first reference signal, the MOS-FET can be controlled to conduct using the first reference signal.

[0050] The first power terminal V1 and the second power terminal V2 are electrically connected through an external charging device. When the first switch module 20 is turned on, the current loop between the first power terminal and the second power terminal is turned on, supplying power to the heating module 10, thereby heating the battery cell module 50 of the battery pack.

[0051] In an embodiment of the present application, the microcontroller unit 30 can control the conduction state of the first switch module 20 by alternately outputting a first signal and a second signal. When the microcontroller unit 30 outputs the first signal to the first control circuit 40, the first control circuit 40 can send a first reference signal to the first switch module 20 to turn on the first switch module 20. When the microcontroller unit 30 outputs the second signal, the first switch module 20 can continue to maintain the conduction state. During the process of the first switch module 20 maintaining the conduction state, the microcontroller unit 30 outputs the next first signal to make the first switch module 20 continue to be turned on. When the microcontroller unit 30 alternately outputs the first signal and the second signal, the microcontroller unit 30 can continue to maintain the conduction state. At this time, the current loop between the heating module 10 and the first power terminal V1 and the second power terminal V2 remains conductive, so that the heating module 10 can heat the battery cell module 50 of the battery pack. Because the first switch module 20 can only be continuously turned on when the microcontroller unit 30 alternately outputs the first signal and the second signal, when other interference signals are present in the battery heating device, as shown in FIG3 , the first capacitor C1 can block direct current and pass alternating current. When a discontinuous high-level interference signal flows into the first control circuit 40, the first capacitor C1 can block the interference signal. When the control signal output by the microcontroller unit 30 is a stable direct current signal, the direct current blocking effect of the first capacitor C1 prevents the control signal from being properly transmitted to the gate and source of the third switch Q3. In both cases, the third switch Q3 is in an off state, and the first control circuit 40 can disconnect the voltage input source from the control terminal of the first switch module 20. The first switch module 20 cannot receive the voltage signal provided by the voltage input source and is disconnected. That is, the first switch module 20 cannot be turned on in the presence of interference signals and is in an off state. At this time, the current loop between the heating module 10 and the first power terminal and the second power terminal is disconnected, the heating module 10 does not operate, and does not heat the battery cell modules 50 of the battery pack. By configuring the microcontroller unit 30 to alternately output the first signal and the second signal to drive the first switch module 20 to conduct, it is possible to prevent the first switch module 20 from malfunctioning under other interference signals, thereby improving the stability and reliability of the battery heating device.

[0052] Figure 3 is a schematic diagram of the circuit structure of the first control circuit 40 provided in an embodiment of the present application. As shown in Figure 3, in one embodiment of the present application, the first control circuit 40 may include a second switch Q2, a third switch Q3, a first capacitor C1, a first resistor R1, and a second resistor R2.

[0053] The second switch Q2 and the third switch Q3 can be connected in series between the output terminal VCC of the voltage input source and the ground GND. The output terminal of the voltage input source can output a voltage signal VCC to power the first control circuit 40 and drive the second switch Q2 to conduct. The second switch Q2 can also be electrically connected to the first switch module 20. The first capacitor C1 and the first resistor R1 can be connected in series between the control terminal of the third switch Q3 and the micro-control unit 30. The second resistor R2 can be electrically connected between the control terminal of the second switch Q2 and the power input source.

[0054] The microcontroller unit 30 alternately outputs a first signal and a second signal, wherein the first signal can be a high-level signal and the second signal can be a low-level signal. When the microcontroller unit 30 outputs the first signal, the first signal can charge the first capacitor C1 and generate a corresponding charging current. Upon receiving this charging current, the control terminal of the third switch Q3 can drive the third switch Q3 to conduct. When the third switch Q3 is on, the two ends of the second resistor R2 are respectively connected to the output terminal of the voltage input source and ground GND. Furthermore, the two ends of the second resistor R2 are also respectively electrically connected to the control terminal of the second switch Q2 and the common node between the second switch Q2 and the voltage input source. The voltage difference across the second resistor R2 is the voltage difference between the control terminal of the second switch Q2 and one end of the second switch Q2. When this voltage difference is greater than the turn-on threshold voltage of the second switch Q2, the second switch Q2 conducts at this voltage difference. At this time, the voltage VCC at the output terminal of the voltage input source is connected to the first switch module 20 through the turned-on second switch Q2. That is, when the second switch Q2 is turned on, the voltage input source may send a first reference signal to the first switch module 20 to turn on the first switch module 20 .

[0055] The first resistor R1 is connected between the first capacitor C1 and the third switch Q3 to limit the current so as to prevent the first capacitor C1 from being charged with an excessive current when the first signal charges the first capacitor C1 .

[0056] The third switch Q3 can be a transistor. The control terminal of the third switch Q3 serves as the base of the transistor, the terminal of the third switch Q3 connected to ground GND serves as the emitter of the transistor, and the terminal of the third switch Q3 connected to the second switch Q2 serves as the collector of the transistor. When the micro-control unit 30 outputs the first signal to charge the first capacitor C1, the charging current can form the Ibe current of the transistor in the third switch Q3, driving the transistor into conduction. It is understood that the transistor can be an N-type transistor.

[0057] The second switch Q2 may be a MOS-FET, wherein the control terminal of the second switch Q2 is the gate of the MOS-FET, and the terminal of the second switch Q2 connected to the voltage input source is the source of the MOS-FET. When the third switch Q3 is turned on, the voltage difference across the second resistor R2 is the voltage difference Vgs between the gate and source of the MOS-FET. When this voltage difference is greater than the turn-on threshold voltage Vth of the MOS-FET, the MOS-FET is turned on. It is understood that the MOS-FET may be a PMOS-FET.

[0058] When the signal output by the microcontroller unit 30 transitions from the first signal to the second signal, charging of the first capacitor C1 ceases, cutting off the charging current. At this point, the third switch Q3 becomes off, and the voltage difference across the second resistor R2 becomes zero, causing the second switch Q2 to also become off. At this point, the first switch module 20 is disconnected from the voltage input source, but the first switch module 20 can remain on for a period of time before turning off. During the period in which the first switch module 20 remains on, the microcontroller unit 30 outputs the next first signal, causing the second and third switches Q2 and Q3 to turn back on. At this point, the first switch module 20 is electrically reconnected to the voltage input source, and the first switch module 20 can continue to remain on under the voltage provided by the voltage input source. While the microcontroller unit 30 alternately outputs the first and second signals, the first switch module 20 can remain on at all times.

[0059] It is understood that the first switch module 20 can maintain an on-state for a limited time after being disconnected from the voltage input source. During this on-state period, if the signal output by the micro-control unit 30 is capable of outputting the next first signal, the first switch module 20 can reconnect to the voltage input source and remain on. If the signal output by the micro-control unit 30 does not output the next first signal during this on-state period, the first switch module 20 will be disconnected, causing the heating module 10 to stop heating. In other words, in order to ensure that the first switch module 20 can maintain an on-state, when the micro-control unit 30 alternately outputs the first and second signals, the duration of the second signal must be set to be shorter than the duration that the first switch module 20 can maintain an on-state after being disconnected from the voltage input source. This ensures that the first switch module 20 can always maintain an on-state when the micro-control unit 30 alternately outputs the first and second signals.

[0060] In one embodiment of the present application, the first control circuit 40 may further include a third resistor R3 and a fourth resistor R4. The third resistor R3 may be electrically connected between the control terminal of the third switch Q3 and the ground GND, and the fourth resistor R4 may be electrically connected between the second switch Q2 and the third switch Q3.

[0061] The third resistor R3 can serve as a bias resistor for the third switch Q3. When the charging current received by the control end of the third switch Q3 is cut off, the control end of the third switch Q3 can discharge the charge through the third resistor R3, so that the third switch Q3 can be stably turned off.

[0062] The fourth resistor R4 is connected between the second switch Q2 and the third switch Q3 to limit the current to prevent the current loop formed between the voltage input source and the ground GND from being too large and causing damage to the components in the circuit.

[0063] In one embodiment of the present application, the first control circuit 40 may further include a Schottky diode D1 , an anode of the Schottky diode D1 may be electrically connected to the second switch Q2 , and a cathode of the Schottky diode D1 may be electrically connected to the first switch module 20 .

[0064] The Schottky diode D1 can limit the current direction between the first switch module 20 and the second switch Q2 so that the current can only flow from the first control circuit 40 to the first switch module 20 , thereby preventing reverse current from flowing into the first control circuit 40 .

[0065] It is understandable that a fifth resistor R5 may be further provided between the first switch module 20 and the Schottky diode D1 . The fifth resistor R5 may limit the current to prevent excessive current between the first switch module 20 and the second switch Q2 .

[0066] In one embodiment of the present application, the first signal and the second signal alternately output by the microcontroller unit 30 may be PWM signals. In each cycle of the PWM signal, the signal duration of the second signal may be set to be less than or equal to the first duration, which may be the duration that the first switch module 20 can continue to remain on when the signal output by the microcontroller unit 30 changes from the first signal to the second signal.

[0067] It is understood that during each cycle of the PWM signal, the first switch module 20 can discharge through the energy storage capacitor Ca when the microcontroller unit 30 begins to output the second signal, so that the first switch Q1 continues to remain on. The duration of this on-state can be a first duration. If the signal duration of the second signal is greater than the first duration, after the first duration, the microcontroller unit 30 continues to output the second signal, and the energy storage capacitor Ca is unable to continue to discharge to maintain the conduction of the first switch Q1, the first switch module 20 becomes disconnected. When the first switch module 20 is disconnected, the current loop formed by the heating module 10 and the first and second power terminals is disconnected, and the heating module 10 will stop heating the battery pack's cell modules 50. To prevent the first switch module 20 from becoming disconnected when the signal duration of the second signal is longer, causing the heating module 10 to stop heating, the signal duration of the second signal needs to be set accordingly. During each cycle of the PWM signal, the signal duration of the second signal should be set to be less than or equal to the first duration, so that the first switch module 20 can receive the next first signal within the time interval during which it continues to remain on, thereby maintaining a continuous on-state.

[0068] Referring to Figure 4 , in one embodiment of the present application, the battery heating device may further include a fourth switch module 21. The fourth switch module 21 is connected in series with the heating module 10 and the first switch module 20, between the first power terminal V1 and the second power terminal V2. When the fourth switch module 21 and the first switch module 20 are both in the on state, the current loop between the heating module 10 and the first and second power terminals is connected, allowing the heating module 10 to heat the battery cell modules 50 of the battery pack.

[0069] In the embodiment of the present application, the first switch module 20 may include a transistor as a controllable switch, and the fourth switch module 21 may be a relay. When at least one of the first switch module 20 and the fourth switch module 21 is in the off state, the current loop in which the heating module 10 is located is disconnected, and the heating module 10 does not operate.

[0070] The first switch module 20 acts as a transistor. When the current in the current loop is too large, the transistor may be broken down, causing the first switch module 20 to always remain on in the breakdown state and unable to be disconnected. If only the first switch module 20 controls the current loop where the heating module 10 is located, the first switch module 20 will continue to be turned on in the breakdown state, which will cause the heating module 10 to continue to heat, resulting in the temperature of the battery cell module 50 being too high. By setting the fourth switch module 21 in series with the first switch module 20 in the current loop, the on-off control of the current loop can be achieved through the first switch module 20 and the fourth switch module 21. Even if the first switch module 20 is abnormal and continues to be turned on, it can be disconnected by controlling the relay, so that the current loop is interrupted and the heating module 10 stops heating.

[0071] The first power terminal can be connected to a positive power signal, and the second power terminal can be connected to a negative power signal. When the current loop in which the heating module 10 is located is turned on, the heating module 10 can heat the cell module 50 of the battery pack under the drive of the positive power signal and the negative power signal. However, when the power terminals and the power signal are connected, reverse connection may occur, that is, the first power terminal is connected to the negative power signal and the second power terminal is connected to the positive power signal. When the fourth switch module 21 is a relay, even if the power terminals and the power signal are connected in reverse, the relay can remain in the disconnected state to prevent the reversed power signal from flowing into the heating module 10.

[0072] By configuring the fourth switch module 21 as a relay, the heating module 10 circuit can still be properly controlled even if the first switch module 20 fails, preventing a single point of failure that could cause the heating module 10 to remain in operation and continuously heat the battery pack. Furthermore, the fourth switch module 21, acting as a relay, can remain disconnected even if the power terminal and the power signal are reversed, preventing the reversed power signal from affecting components in the current loop.

[0073] The device that implements switch control in the first switch module 20 is a transistor, and the microcontroller unit 30 needs to output alternating first and second signals to the first control circuit 40 to drive the first switch module 20 to conduct. When the fourth switch module 21 is a relay, as shown in Figure 4, the microcontroller unit 30 can be electrically connected to the fourth switch module 21 and control the conduction and cutoff of the relay through a stable drive signal, without the need to control the relay through the first control circuit 40. For example, the microcontroller unit 30 can output a conduction signal or a cutoff signal to the fourth switch module 21 to control the conduction and cutoff of the fourth switch module 21. In a specific embodiment, the signal voltage of the control signal that the microcontroller unit 30 can output is relatively small, for example, typically 3.3V. The signal voltage required to control the relay is relatively large, for example, 12V or 24V voltage is typically used to drive the relay to change state. When the signal voltage provided by the microcontroller unit 30 is insufficient to drive the relay to change state, a driving circuit (not shown) can be set between the microcontroller unit 30 and the fourth switch module 21. The microcontroller unit 30 outputs a control signal with a lower voltage to the driving circuit. The driving circuit can provide a suitable driving voltage to the relay when receiving the control signal output by the microcontroller unit 30, so as to drive the relay to be turned on or off.

[0074] It can be understood that, only when the first switch module 20 and the fourth switch module 21 are both turned on, can the current loop where the heating module 10 is located remain turned on.

[0075] It is understood that when the fourth switch module 21 includes a MOS-FET as a controllable switch device, the MOS-FET conduction condition is that the voltage difference between the gate and the source satisfies the MOS-FET's turn-on threshold voltage. As shown in FIG5 , the fourth switch module 21 may further include a third voltage-dividing resistor Rb and a fourth voltage-dividing resistor Rb1. The ends of the third voltage-dividing resistor Rb are electrically connected to the gate and source of the MOS-FET, respectively, and the fourth voltage-dividing resistor Rb1 is electrically connected between the gate of the MOS-FET and the first control circuit 40. Similar to the embodiment in which the first voltage-dividing resistor Ra and the second voltage-dividing resistor Ra1 are provided in the first switch module 20, the third voltage-dividing resistor Rb and the fourth voltage-dividing resistor Rb1 can form a voltage-dividing circuit. By setting the resistance values ​​of the third voltage-dividing resistor Rb and the fourth voltage-dividing resistor Rb1, when the first control circuit 40 outputs the first reference signal, the voltage across the third voltage-dividing resistor Rb satisfies the turn-on threshold voltage, thereby controlling the MOS-FET to conduct via the first reference signal.

[0076] 5 , in one embodiment of the present application, the first control circuit 40 may further include a fifth switch 22. The fifth switch 22 and the fourth switch module 21 are connected in series between the first power terminal and the second power terminal. The first switch module 20, the fourth switch module 21, and the fifth switch 22 may all be transistors.

[0077] In the current loop formed by the heating module 10 and the first power terminal and the second power terminal, when the first switch module 20, the fourth switch module 21 and the fifth switch 22 are all in the on state, the current loop is conducted, and the heating module 10 can heat the battery cell module 50 of the battery pack.

[0078] The first switch module 20, the fourth switch module 21, and the fifth switch 22 can include MOS-FETs as controllable switching devices. The fourth switch module 21 and the fifth switch 22 can be connected in series to one end of the heating module 10, while the first switch module 20 can be electrically connected to the other end of the heating module 10. In other words, both ends of the heating module 10 are connected to the first and second power terminals, respectively, via transistors. When the heating module 10 is not activated, the transistors can be controlled to disconnect, preventing one end of the heating module 10 from being directly electrically connected to a positive power signal, which could damage components within the heating module 10.

[0079] The fourth switch module 21 and the fifth switch 22 can be connected in reverse series. For example, the fourth switch module 21 and the fifth switch 22 can be MOSFETs with body diodes. The connection point between the cathode of the body diode of the fourth switch module 21 and the cathode of the body diode of the fifth switch 22 serves as the common node of the fourth switch module 21 and the fifth switch 22. By connecting the fourth switch module 21 and the fifth switch 22 in reverse series, if the connection between the power terminal and the power signal is reversed, the fourth switch module 21 receives a negative power signal when connected to the first power terminal. The fourth switch module 21 can remain in the off state, thereby providing reverse connection protection for the battery heating device. The fifth switch 22 can also achieve multi-point control together with the first switch module 20. When both the fifth switch 22 and the first switch module 20 are in the on state, the current loop of the heating module 10 is connected, reducing the risk of the heating loop remaining open due to failure of the first switch Q1 when only the first switch Q1 is used. When the first control circuit 40 does not output the first reference signal, the fifth switch 22 is in the off state. At this time, the body diode provided on the fifth switch 22 prevents direct connection between the first power terminal and the heating module 10. Furthermore, even if one of the transistors in the first switch module 20 and the fifth switch 22 breaks down or fails and remains continuously on, the first control circuit 40 can still control the other transistor to turn off. For example, if the transistor acting as a switching device in the first switch module 20 breaks down or fails and remains continuously on, the first control circuit 40 can also control the fifth switch 22 to turn off, thereby disconnecting the current loop in which the heating module 10 resides. Similarly, if the transistor in the fifth switch 22 remains continuously on, the first control circuit 40 can also disconnect the heating current loop by controlling the first switch module 20. When the first switch module 20 and the fifth switch 22 are not simultaneously continuously on, the first control circuit 40 can still properly control the on / off of the current loop, thereby avoiding the risk of a single-point failure in the first switch module 20 or the fifth switch 22, which could result in the current loop not being properly disconnected and the heating module 10 continuing to heat. That is, the fourth switch module 21 and the fifth switch 22 can prevent a single transistor from failing and causing the heating module 10 to continue heating, and can provide reverse connection protection when the connection between the power terminal and the power signal is reversed, thereby preventing the reverse power signal from damaging the heating module 10.

[0080] Referring to FIG. 6 , in one embodiment of the present application, the battery heating device may further include a second control circuit 41. The second control circuit 41 may be connected between the fourth switch module 21 and the fifth switch 22 and the first control circuit 40. When the microcontroller unit 30 outputs a first signal, the first control circuit 40 may respond to the first signal by sending a corresponding control signal to the second control circuit 41. The second control circuit 41 may then use this control signal to turn on the fourth switch module 21 and the fifth switch 22.

[0081] The second control circuit 41 may include transistors as controllable switch devices, the fourth switch module 21 and the fifth switch 22 may include transistors of the same type, and the first switch module 20 may include transistors of another type. For example, the first switch module 20 may include NMOS-FETs, and the fourth switch module 21 and the fifth switch 22 may include PMOS-FETs.

[0082] In one specific embodiment, the MOS-FET in the second control circuit 41 can be an NMOS-FET, which can play a role in signal inversion. For example, when the microcontroller unit 30 outputs the first signal, the first reference signal output by the first control circuit 40 can be a high-level signal provided by the voltage input source. This high-level signal can be divided by the first voltage-dividing resistor Ra and the second voltage-dividing resistor Ra1 to drive the NMOS-FET in the first switch module 20 to turn on, that is, drive the first switch Q1 to turn on. At this time, the NMOS-FET in the second control circuit 41 can also receive the voltage signal divided by the first voltage-dividing resistor Ra and the second voltage-dividing resistor Ra1 and turn on. When the second control circuit 41 is turned on, the fourth voltage-dividing resistor Rb1 in the fourth switch module 21 is connected to the second power supply terminal through the second control circuit 41, which is equivalent to the fourth voltage-dividing resistor Rb1 being grounded through the second control circuit 41. Since the fourth switch module 21 and the fifth switch 22 include PMOS-FETs, when the gates of the two PMOS-FETs are grounded, the absolute value of the voltage Vgs between the gate and the source is greater than the absolute value of the threshold voltage Vth. In this case, the fourth switch module 21 and the fifth switch 22 are also turned on. That is, when the first control circuit 40 outputs a high-level signal, the first switch module 20, the fourth switch module 21, and the fifth switch 22 are all in the on state.

[0083] When the first control circuit 40 outputs a low-level signal, the first switch module 20 receives the divided low-level signal and turns off. The NMOS-FET in the second control circuit 41 also receives the same signal and turns off. When the fourth switch module 21 and the fifth switch 22 are connected in series, the anode of the body diode of the fourth switch module 21 is connected to the first power terminal, and the cathode of the body diode is connected to the fifth switch 22. When the first power terminal is electrically connected to the positive power signal, the positive power signal can flow into the fifth switch 22 through the body diode. That is, when the fourth switch module 21 is turned on and off, the positive power signal can be electrically connected to the fifth switch 22 through the body diode. It is understandable that when the second control circuit 41 is turned off, the positive power signal can also flow into the gates of the PMOS-FETs of the fourth switch module 21 and the fifth switch 22 through the third voltage divider resistor Rb. At this point, the gate voltage and source voltage of the PMOS-FETs of the fourth switch module 21 and the fifth switch 22 are consistent, the gate-source voltage Vgs is equal to 0, and the absolute value of Vgs is less than the absolute value of the threshold voltage Vth, causing the PMOS-FETs of the fourth switch module 21 and the fifth switch 22 to enter the off state. That is, when the first control circuit 40 outputs a low-level signal, the first switch module 20, the fourth switch module 21, and the fifth switch 22 are all in the off state.

[0084] 7 and 8 , in an embodiment of the present application, the first power terminal may be at least one of a positive discharge terminal P+ or a positive charge terminal C+, and the second power terminal may be at least one of a negative discharge terminal P− or a negative charge terminal C−.

[0085] As shown in Figure 7, the positive discharge terminal P+ and the positive charging terminal C+ can be out of phase, and the negative discharge terminal P- and the negative charging terminal C- can be out of phase. In one embodiment of the present application, the positive discharge terminal P+ and the negative discharge terminal P- can form a heating circuit with the positive electrode B+ and the negative electrode B- of the battery cell module 50 of the battery pack. At this time, the battery cell module of the battery pack is discharged, providing a heating current to power the heating module. In another embodiment of the present application, the positive charging terminal C+ and the negative charging terminal C- can be electrically connected to an external charging device, which can be a charger, a charging pile or other charging device. The external charging device forms a heating circuit through the positive charging terminal C+ and the negative charging terminal C-, providing a heating current to power the heating module.

[0086] As shown in Figure 8, the positive discharge terminal P+ and the positive charging terminal C+ can be the same port, and the negative discharge terminal P- and the negative charging terminal C- can be the same port. In this specific implementation of the present application, when the external charging device is electrically connected to the positive terminal (including C+ and P+) and the negative terminal (including C- and P-) set at the same port, the micro control unit 30 can send a control signal to first disconnect the charging switch 23 and the discharge switch 24 (shown in Figure 12) provided on the main circuit. The external charging device forms a heating circuit through the positive terminal and the negative terminal, provides a heating current, and powers the heating module. The heating module generates heat and then heats the battery module 50. When the temperature of the battery module 50 reaches a preset temperature threshold, the micro control unit 30 can disconnect the first switch Q1 and / or disconnect the fifth switch 22 to turn off the heating circuit. The micro control unit 30 sends a control signal to turn on the charging switch 23 and the discharge switch 24, and the external charging device can charge the battery module 50 through the positive terminal and the negative terminal.

[0087] Referring to FIG. 9 , in one embodiment of the present application, the battery heating device may further include a first temperature measuring element NTC1. In a specific embodiment of the present application, the first temperature measuring element NTC1 may be a thermistor with a negative temperature coefficient (Negative Temperature Coefficient). The first temperature measuring element NTC1 is electrically connected to the microcontroller unit 30. The first temperature measuring element NTC1 may be disposed adjacent to at least one of the first switch module 20 and the fourth switch module 21 to detect the temperature of at least one of the first switch module 20 and the fourth switch module 21. In other specific embodiments, the first temperature measuring element may also be a temperature sensor or a thermistor with a positive temperature coefficient.

[0088] The microcontrol unit 30 can determine the temperature of at least one of the first switch module 20 and the fourth switch module 21 by obtaining the electrical signal parameters of the first temperature measuring element NTC1. When the microcontrol unit 30 determines that the temperature of at least one of the first switch module 20 and the fourth switch module 21 reaches a preset temperature threshold, it is judged that at least one of the first switch module 20 and the fourth switch module 21 may be damaged. At this time, the microcontrol unit 30 can control the first switch module 20 and the fourth switch module 21 to be disconnected to stop the heating module 10 from heating.

[0089] Referring to Figure 10 , in one embodiment of the present application, the battery heating device may further include a connector 11, and the heating module 10 may include a heating film 12. The connector 11 is electrically connected to the heating film 12, and the connector 11 and the heating film 12 are electrically connected between a first power terminal and a second power terminal. When the current loop is conducting, the heating film 12 can be electrically connected to the first power terminal and the second power terminal via the connector 11, and driven by the power signal, heats the battery cell module 50 of the battery pack.

[0090] Continuing with FIG. 10 , in one embodiment of the present application, the battery heating device may further include a second temperature measuring element NTC2. In one specific embodiment of the present application, the second temperature measuring element NTC2 may be a thermistor with a negative temperature coefficient. The second temperature measuring element NTC2 may be electrically connected to the connector 11, and the connector 11 and the second temperature measuring element NTC2 may be electrically connected to the microcontroller unit 30. During the layout design of the BMS (Battery Management System) circuit board, the second temperature measuring element NTC2 may be positioned adjacent to the heating film 12 to detect the temperature of the heating film 12. The microcontroller unit 30 may determine the temperature of the heating film 12 by acquiring electrical signal parameters from the second temperature measuring element NTC2. When the temperature of the heating film 12 reaches a preset temperature threshold, the microcontroller unit 30 may determine that the heating film 12 may be malfunctioning. In this case, the microcontroller unit 30 may control the first and fourth switch modules 20 and 21 to disconnect, thereby stopping heating of the heating module 10.

[0091] Referring to FIG. 11 , in one embodiment of the present application, the battery heating device may further include a fuse F1 , which may be electrically connected between the first power terminal and the second power terminal.

[0092] When an abnormality occurs in the current loop where the heating module 10 is located, the loop current will increase rapidly. When the loop current increases to the melting current of the fuse F1, the fuse F1 can disconnect the current loop where the heating module 10 is located by melting, thereby stopping the heating process of the heating module 10. For example, the abnormality of the current loop may be a short circuit inside the heating module 10, a break in the positive and negative wiring harnesses of the heating module 10, or a solder short circuit between the pins of the connector 11. When a short circuit occurs inside the heating module 10, it may cause the resistance inside the heating module 10 to decrease, causing the loop current to increase rapidly. When the positive and negative wiring harnesses of the heating module 10 are broken, it may also cause the positive and negative wiring harnesses to be directly electrically connected, resulting in excessive current. When a solder short circuit occurs between the pins of the connector 11, it may cause the pins of the connector 11 to be directly electrically connected, resulting in a short circuit.

[0093] Battery Management System

[0094] One embodiment of the present application provides a battery management system that includes the battery heating device described in the above embodiment. The battery management system can be installed in a battery pack. When the battery pack is in a low temperature environment, the battery management system can control the battery heating device to heat the battery cell modules in the battery pack, allowing the battery cell modules to reach a suitable temperature in a relatively short period of time, thereby improving the charge and discharge performance of the battery cell modules in low temperature environments.

[0095] Referring to Figure 12 , the battery management system may further include a charge / discharge switch connected in series with the battery module 50. The charge / discharge switch may include a charge switch 23 and a discharge switch 24. The charge switch 23 and the discharge switch 24 may be MOS-FETs. The battery management system can charge and discharge the battery module 50 by controlling the conduction state of the charge switch 23 and the discharge switch 24.

[0096] Referring to Figure 13, each battery cell in the battery cell module 50 may also be provided with a corresponding third temperature measuring element NTC3. The third temperature measuring element NTC3 is electrically connected to the micro control unit 30. In a specific embodiment of the present application, the third temperature measuring element NTC3 may be a thermistor with a negative temperature coefficient. The micro control unit 30 may determine the battery cell temperature of each corresponding battery cell through the electrical signal parameters sent by each third temperature measuring element NTC3. When the heating module 10 heats the battery cell module 50, if the micro control unit 30 detects that the battery cell temperature is too high, it may control the heating module 10 to stop heating. When the battery cell module 50 performs a charging or discharging operation, if the micro control unit 30 detects that the battery cell temperature is too high, it may stop the charging process or the discharging process of the battery cell module 50 by controlling the conduction state of the charging switch 23 or the discharging switch 24.

[0097] Since the battery heating device has been described in detail in the foregoing embodiments, the heating principle of the battery heating device in the battery management system can refer to the description in the foregoing embodiments and will not be described again here.

[0098] battery pack

[0099] One embodiment of the present application provides a battery pack, which may include a battery cell module and the battery management system of the above embodiment, wherein the battery cell module includes at least one battery cell. The battery management system is electrically connected to the battery cell module. When the battery pack is in a low temperature environment, the battery management system can heat the battery cell module so that the battery cell module can rise to a suitable temperature in a relatively short time, thereby improving the charge and discharge performance of the battery cell module in a low temperature environment.

[0100] It should be noted that, since the aforementioned embodiments have already described the battery management system in detail, the heating principle of the battery management system in the battery pack can refer to the description in the aforementioned embodiments and will not be repeated here.

[0101] Electrical devices

[0102] One embodiment of the present application provides an electrical device, including the battery pack of the above embodiment. The electrical device can be an electric vehicle, a drone, an electric two-wheeled vehicle, an electric tool, an energy storage system, etc. When the electrical device is used in a relatively low temperature environment, the battery heating device in the battery pack can be powered by the battery module in the battery pack or an external charging device, so that the battery module can be heated by the heating module of the battery heating device, so that the battery module can be raised to an appropriate temperature in a relatively short time, thereby improving the charging and discharging performance of the battery module in a low temperature environment and enhancing the user experience of the electrical device in a low temperature environment.

[0103] It should be noted that, since the aforementioned embodiments have already described the battery heating device in detail, the heating principle of the battery heating device in the electrical device can refer to the description in the aforementioned embodiments and will not be repeated here.

[0104] In solving the technical problem of insufficient stability and reliability of the existing battery pack heating module, the embodiments of the present application are configured to alternately output a first signal and a second signal by setting a microcontroller unit to control the first switch module to be continuously turned on. When the microcontroller unit outputs the first signal to the first control circuit, the first control circuit can send a first reference signal to the first switch module to turn on the first switch module. When the microcontroller unit outputs the second signal, the first switch module can maintain the on state. When the microcontroller unit alternately outputs the first signal and the second signal, the microcontroller unit can continuously maintain the on state. At this time, the current loop between the heating module and the first power terminal and the second power terminal remains conductive, thereby enabling the heating module to heat the battery cell module of the battery pack. When there are other interference signals in the battery heating device, the first switch module will not be able to maintain the on state under the interference signal. At this time, the current loop between the heating module and the first power terminal and the second power terminal cannot be stably connected, the heating module will not work, and will not heat the battery cell module of the battery pack. By setting the microcontroller unit to alternately output the first signal and the second signal to drive the first switch module to conduct, it is possible to avoid the first switch module from malfunctioning under interference signals other than the alternating signal, thereby improving the stability and reliability of the battery heating device.

[0105] It should be understood that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0106] It should be understood that the foregoing description of this specification is based on specific embodiments. Other embodiments are within the scope of the claims. In some cases, the actions or steps recited in the claims can be performed in an order different from that described in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order shown or the sequential order to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0107] It should be understood that an element described herein in the singular or shown in the drawings as only one does not limit the number of the element to one. In addition, modules or elements described or shown herein as separate may be combined into a single module or element, and modules or elements described or shown herein as single may be split into multiple modules or elements.

[0108] It should also be understood that the terms and expressions used herein are for descriptive purposes only, and the one or more embodiments of this specification should not be limited to these terms and expressions. The use of these terms and expressions does not mean to exclude any equivalent features of the illustrations and descriptions (or portions thereof), and it should be recognized that various modifications that may exist should also be included in the scope of the claims. Other modifications, variations, and substitutions may also exist. Accordingly, the claims should be deemed to cover all such equivalents.

Claims

1. A battery heating device, comprising: A heating module, used to heat the battery cell module of the battery pack; A first switch module, comprising a first switch, wherein the heating module and the first switch module are connected in series between the first power terminal and the second power terminal; A micro control unit configured to alternately output a first signal and a second signal of high and low levels; a first control circuit electrically connected between the micro control unit and the first switch module; wherein the first control circuit is configured to respond to the first signal to turn on the first switch module; Wherein, the first switch module remains turned on when the micro control unit outputs the second signal.

2. The battery heating device according to claim 1, wherein: The first control circuit includes: a second switch and a third switch, wherein the second switch and the third switch are connected in series between the output terminal of the voltage input source and the ground, and the second switch is also electrically connected to the first switch module; a first capacitor and a first resistor, wherein the first capacitor and the first resistor are connected in series between the control terminal of the third switch and the micro control unit; a second resistor, electrically connected between the control terminal of the second switch and the voltage input source; The voltage input source is used to supply power to the first control circuit.

3. The battery heating device according to claim 2, wherein: The first control circuit further includes a third resistor and a fourth resistor. The third resistor is electrically connected between the control terminal of the third switch and the ground. The fourth resistor is electrically connected between the second switch and the third switch.

4. The battery heating device according to claim 2 or 3, wherein: The first control circuit further includes a Schottky diode and a fifth resistor, and the Schottky diode and the fifth resistor are electrically connected between the second switch and the first switch module.

5. The battery heating device according to claim 2 or 3, wherein: The first switch module further includes: a first voltage-dividing resistor and a second voltage-dividing resistor, wherein the first voltage-dividing resistor and the second voltage-dividing resistor are connected in series between the first control circuit and the first switch; An energy storage capacitor is connected in parallel with the second voltage-dividing resistor and is used to release charge to keep the first switch turned on when the micro control unit outputs the second signal.

6. The battery heating device according to claim 5, wherein: The micro control unit alternately outputs a first signal and a second signal of high and low levels as a PWM signal, and the duration of the second signal is less than or equal to the first duration.

7. The battery heating device according to claim 1, wherein: The battery heating device further comprises: The fourth switch module is connected in series with the heating module and the first switch module between the first power terminal and the second power terminal.

8. The battery heating device according to claim 7, wherein: The first switch module is a transistor, and the fourth switch module is a relay.

9. The battery heating device according to claim 8, wherein: The battery heating device further comprises: a fifth switch, wherein the fifth switch and the fourth switch module are connected in series between the first power terminal and the second power terminal; The first switch module, the fourth switch module, and the fifth switch are all transistors.

10. The battery heating device according to claim 9, wherein: The fourth switch module further includes: A third voltage-dividing resistor and a fourth voltage-dividing resistor are connected in series between the fourth switch module, the fifth switch, and the first control circuit.

11. The battery heating device according to claim 10, wherein: The battery heating device further comprises: The second control circuit is electrically connected between the fourth switch module, the fifth switch and the first control circuit; wherein the second control circuit is configured to respond to the first signal to turn on the fourth switch module and the fifth switch.

12. The battery heating device according to claim 9, wherein: The first power terminal is at least one of a positive discharge terminal and a positive charge terminal, and the second power terminal is at least one of a negative discharge terminal and a negative charge terminal.

13. The battery heating device according to claim 12, wherein: The battery heating device further comprises: The first temperature measuring element is electrically connected to the micro control unit and is used to detect the temperature of the first switch module and / or the temperature of the fourth switch module.

14. The battery heating device according to claim 1, wherein: The battery heating device further includes a connector, and the heating module includes a heating film; The connector is electrically connected to the heating film, and the connector and the heating film are electrically connected between the first power terminal and the second power terminal.

15. The battery heating device according to claim 14, wherein: The battery heating device further comprises: A second temperature measuring element is electrically connected to the connector and is used to detect the temperature of the heating film; the connector and the second temperature measuring element are electrically connected to the micro control unit.

16. The battery heating device according to claim 1, wherein: The battery heating device further comprises: A fuse is electrically connected between the first power terminal and the second power terminal.

17. A battery management system comprising the battery heating device according to any one of claims 1 to 16.

18. A battery pack comprising a battery cell module and the battery management system according to claim 14, wherein: The battery cell module includes at least one battery cell; The battery management system is electrically connected to the battery cell module.

19. An electrical device comprising the battery pack according to claim 18.

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