Battery self-heating device and vehicle equipped with the battery self-heating device

Abstract

A vehicle provided with a battery self-heating device. The battery self-heating device includes a power storage device, an inductor, a control unit, and a capacitor. The power storage device includes a first power storage device and a second power storage device arranged in series. One end of the inductor is connected between the first power storage device and the second power storage device. The control unit includes at least one phase of bridge arms. The other end of the inductor is connected to the midpoint of at least one phase of bridge arms. Both ends of at least one phase of bridge arms are respectively connected to the positive electrode and the negative electrode of the power storage device. Both ends of the capacitor are respectively connected to the positive electrode and the negative electrode of the power storage device. The capacitor includes a first X capacitor and a second X capacitor connected in series. One end of the inductor is connected between the first X capacitor and the second X capacitor.

Description

Technical Field

[0001] Cross - reference to related applications This disclosure claims the priority and benefit of Chinese Patent Application No. 202222189333.6, entitled "BATTERY SELF - HEATING DEVICE AND VEHICLE WITH SAME", filed on August 18, 2022, which is incorporated herein by reference in its entirety.

[0002] Field This disclosure relates to the field of vehicle technology, and in particular, to a battery self - heating device and a vehicle equipped with the battery self - heating device.

Background Art

[0003] In related - art electric vehicles, when driving in a low - temperature environment, the charge - discharge performance of the energy storage device significantly deteriorates, and the charge - discharge efficiency is low. As a result, the cruising range of the vehicle is greatly shortened, the service life of the energy storage device is affected, and the user experience deteriorates. Generally, existing battery heating devices can only heat the battery when the vehicle is stopped. For example, the battery can be heated by using a positive temperature coefficient (PTC) thermistor. This makes it difficult to solve the problem of heating the battery during vehicle driving.

Summary of the Invention

Means for Solving the Problems

[0004] This disclosure aims to solve at least one of the technical problems existing in the related art. Therefore, the objective of this disclosure is to provide a battery self - heating device. When the battery self - heating device is applied to a vehicle, the energy storage device can realize self - heating both during vehicle driving and when the vehicle is in a parked state, ensuring the cruising range of the vehicle and extending the service life of the energy storage device.

[0005] According to the present disclosure, a vehicle equipped with the aforementioned battery self-heating device is further provided.

[0006] To achieve the aforementioned object, according to an embodiment of the first aspect of the present disclosure, a power storage device including a first power storage device and a second power storage device arranged in series, an inductor having one end connected between the first power storage device and the second power storage device arranged in series, a control unit including at least one phase bridge arm, the other end of the inductor being connected to the midpoint of the at least one phase bridge arm, and both ends of the at least one phase bridge arm being connected to the positive electrode and the negative electrode of the power storage device respectively, and a capacitor including a first X capacitor and a second X capacitor connected in series, both ends of which are connected to the positive electrode and the negative electrode of the power storage device respectively, and one end of the inductor being connected between the first X capacitor and the second X capacitor, is provided.

[0007] According to an embodiment of the present disclosure, when the battery self-heating device is applied to a vehicle, the power storage device can realize self-heating both during the running of the vehicle and when the vehicle is in a parked state, ensuring the cruising range of the vehicle and extending the service life of the power storage device.

[0008] According to some embodiments of the present disclosure, the first X capacitor is an X1 capacitor, and the second X capacitor is an X2 capacitor.

[0009] According to some embodiments of the present disclosure, the first X capacitor is connected to one end of the inductor via a first contactor.

[0010] According to some embodiments of the present disclosure, the inductor is at least one phase winding of a motor.

[0011] According to some embodiments of the present disclosure, the inductor is three phase windings of a motor, the control unit is a motor controller, and the motor controller includes three phase bridge arms. One end of the three phase windings is connected between a first power storage device and a second power storage device connected in series after being joined via an N wire, and the other ends of the three phase windings are respectively connected to the midpoints of the three phase bridge arms.

[0012] According to some embodiments of the present disclosure, the three phase bridge arms each include an upper bridge arm and a lower bridge arm, and the three upper bridge arms are connected to the positive electrode of the power storage device via a self-heating safety device after being joined.

[0013] According to some embodiments of the present disclosure, the self-heating safety device is a fuse wire.

[0014] According to some embodiments of the present disclosure, the battery self-heating device further includes a hole sleeved on a conductive structure, to which the three phase bridge arms and the three phase windings are connected via the conductive structure, and connected to the control unit.

[0015] According to some embodiments of the present disclosure, the first power storage device includes a first battery and a first resistor connected in series, and the second power storage device includes a second battery and a second resistor connected in series.

[0016] According to some embodiments of the present disclosure, the motor controller is connected to the three phase bridge arms and is configured to control the three upper bridge arms to turn off simultaneously and control the three lower bridge arms to turn off simultaneously, and further includes a control panel in which the states of the three lower bridge arms are opposite to the states of the three upper bridge arms.

[0017] According to some embodiments of the present disclosure, the battery self-heating device further includes a second contactor configured to control the connection and disconnection between one end of the inductor and the power storage device, which are respectively connected to one end of the inductor and the power storage device.

[0018] According to some embodiments of the present disclosure, the first power storage device includes a first battery and a first resistor connected in series, and the second power storage device includes a second battery and a second resistor connected in series.

[0019] According to some embodiments of the present disclosure, the power storage device is a battery pack.

[0020] According to some embodiments of the present disclosure, the first X capacitor can withstand a high voltage of 2.5 kV to 4 kV, and the second X capacitor can withstand a high voltage of 2.5 kV or less.

[0021] According to some embodiments of the present disclosure, the first X capacitor is an X1 capacitor, and the second X capacitor is an X2 capacitor.

[0022] According to an embodiment of the second aspect of the present disclosure, a vehicle is provided that includes the battery self-heating device according to the embodiment of the first aspect of the present disclosure.

[0023] According to an embodiment of the second aspect of the present disclosure, the battery self-heating device according to the embodiment of the first aspect of the present disclosure is used, whereby the power storage device can realize self-heating both during the running of the vehicle and when the vehicle is in a parked state, ensuring the cruising range of the vehicle and extending the service life of the power storage device.

[0024] Further aspects and advantages of the present disclosure are given in the following description, some of which will be apparent from the following description or can be learned from the practice of the present disclosure.

[0025] The foregoing and / or further aspects and advantages of the present disclosure will become apparent and understandable in the description of embodiments made with reference to the following attached drawings.

Brief Description of the Drawings

[0026]

Figure 1

Figure 2

Figure 3

Figure 4

Description of Reference Numerals

[0027] 1 Battery self-heating device 100 Power storage device 110 First power storage device 111 First battery 112 First resistor 120 Second power storage device 121 Second battery 122 Second resistor 123 N wire 200 Motor 210 Inductor 300 Control unit 310 Bridge arm 320 Three-phase bridge arm 321 Upper bridge arm 322 Lower bridge arm 301 Control panel 400 Capacitor 410 First X capacitor 420 Second X capacitor 430 First contactor 500 Self-heating safety device 600 Hall 601 Conductive structure 700 Second contactor 1000 Vehicle

DETAILED DESCRIPTION OF THE INVENTION

[0028] Embodiments of the present disclosure will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, and the same or similar reference numerals in all the accompanying drawings indicate the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and are used only for explaining the present disclosure and should not be construed as a limitation to the present disclosure.

[0029] In the description of the present disclosure, the directions or positional relationships indicated by terms such as “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial direction”, “radial direction”, and “circumferential direction” are the directions or positional relationships shown based on the accompanying drawings, and do not indicate or imply that the device or element should have a specific direction or be constructed and operated in a specific direction. It is simply used to explain the present disclosure and simplify the description, and therefore, it should be understood that it should not be construed as a limitation to the present disclosure.

[0030] In the description of the present disclosure, the “first feature” or “second feature” may include one or more features.

[0031] In the description of the present disclosure, “a plurality” means two or more, and “some” means one or more.

[0032] The battery self-heating device 1 according to the embodiment of the present disclosure will be described below with reference to the accompanying drawings.

[0033] As shown in FIGS. 1 and 2, the battery self-heating device 1 according to the embodiment of the present disclosure includes a power storage device 100, an inductor 210, a control unit 300, and a capacitor 400.

[0034] The power storage device 100 includes a first power storage device 110 and a second power storage device 120 arranged in series. One end of the inductor 210 is connected between the first power storage device 110 and the second power storage device 120 arranged in series. The control unit 300 includes at least one phase bridge arm 310. The other end of the inductor 210 is connected to the midpoint of at least one phase bridge arm 310, and both ends of at least one phase bridge arm 310 are respectively connected to the positive electrode and the negative electrode of the power storage device 100. Both ends of the capacitor 400 are respectively connected to the positive electrode and the negative electrode of the power storage device 100. The capacitor 400 includes a first X capacitor 410 and a second X capacitor 420 connected in series, and one end of the inductor 210 is connected between the first X capacitor 410 and the second X capacitor 420.

[0035] The power storage device 100 may be a battery pack, that is, a power battery.

[0036] Note that each phase bridge arm 310 includes two power switches connected in series. The connection of the other end of the inductor 210 to the midpoint of at least one phase bridge arm 310 does not mean that the other end of the inductor 210 is connected to the intermediate position of at least one phase bridge arm 310, but means that the other end of the inductor 210 is connected between two power switches connected in series.

[0037] Note that the power switch in the present disclosure may be an IGBT (Insulated Gate Bipolar Transistor), a MOS transistor (Metal Oxide Semiconductor), a bipolar junction transistor, or a switch made of silicon carbide or the like.

[0038] According to the battery self-heating device 1 of this embodiment of the present disclosure, the power storage device 100 includes a first power storage device 110 and a second power storage device 120 arranged in series, and one end of the inductor 210 is connected between the first power storage device 110 and the second power storage device 120 arranged in series. The control unit 300 includes at least one phase bridge arm 310, the other end of the inductor 210 is connected to the midpoint of at least one phase bridge arm 310, and both ends of at least one phase bridge arm 310 are connected to the positive electrode and the negative electrode of the power storage device 100 respectively. When the battery self-heating device 1 is applied to a vehicle, the power storage device 100 can achieve self-heating both during the running of the vehicle and when the vehicle is in a parked state, ensuring the cruising range of the vehicle and extending the service life of the power storage device 100.

[0039] For example, as shown in FIG. 2, in the positive half cycle of the fundamental wave period, when the upper power switch of the bridge arm 310 is turned on and the lower power switch of the bridge arm 310 is turned off, the first power storage device 110 discharges, and the current forms a loop passing through the IGBT of the upper power switch of the bridge arm 310. The current of the first power storage device 110 charges the inductor 210 through the upper power switch of the bridge arm 310. When the upper power switch of the bridge arm 310 is turned off and the lower power switch of the bridge arm 310 is turned on, the inductor 210 supplies a freewheel current to charge the second power storage device 120, and a loop passing through the diode of the lower power switch of the bridge arm 310 is formed.

[0040] In the negative half-cycle of the fundamental wave period, when the upper power switch of the bridge arm 310 is turned off and the lower power switch of the bridge arm 310 is turned on, the second energy storage device 120 discharges, and the current forms a loop through the IGBT of the lower power switch of the bridge arm 310. The current of the second energy storage device 120 charges the inductor 210 through the lower power switch of the bridge arm 310. When the upper power switch of the bridge arm 310 is turned on and the lower power switch of the bridge arm 310 is turned off, the inductor 210 supplies a freewheel current to charge the first energy storage device 110 and forms a loop through the diode of the lower power switch of the bridge arm 310.

[0041] Therefore, the two power switches of the bridge arm 310 operate at a high on / off frequency, and the first energy storage device 110 and the second energy storage device 120 charge and discharge each other due to current oscillation. As a result, the internal resistance of the first energy storage device 110 and the internal resistance of the second energy storage device 120 generate heat, realizing self-heating of the energy storage device 100.

[0042] In this way, in a low-temperature environment, the energy storage device 100 can perform self-heating, thereby improving the power supply efficiency of the energy storage device 100. For example, during the running of a vehicle, the energy storage device 100 can perform self-heating, so the energy storage device 100 maintains an operating state in which power is supplied with high efficiency. Also, when the energy storage device 100 is charged, the energy storage device 100 can first perform self-heating to improve the charging efficiency.

[0043] Also, the current of the power storage device 100 flows through the bridge arm 310 and the inductor 210, and then returns to the power storage device 100. Compared with heating the power storage device by using a positive temperature coefficient (PTC) thermistor of the related art, the electrical energy loss of the power storage device 100 of the present disclosure is low. While effectively increasing the temperature of the power storage device 100, the electrical energy of the power storage device 100 is not greatly lost, the heating loss is reduced, and the cruising range is improved. Also, there is no need to additionally arrange a PTC heating member, thereby reducing cost, volume, and the number of components.

[0044] Also, both ends of the capacitor 400 are respectively connected to the positive electrode and the negative electrode of the power storage device 100. The capacitor 400 includes a first X capacitor 410 and a second X capacitor 420 connected in series, and one end of the inductor 210 is connected between the first X capacitor 410 and the second X capacitor 420.

[0045] Therefore, when the power storage device 100 supplies power to the bridge arm 310 to drive the vehicle, the current of the power storage device 100 first passes through the first X capacitor 410 and the second X capacitor 420 to absorb the ripple current of the output current of the power storage device 100, so that the voltage when the power storage device 100 supplies power to the bridge arm 310 is stabilized. When the power storage device 100 is charged, the current entering the power storage device 100 also first passes through the capacitor 400. Since the capacitor 400 can absorb the ripple current of the charging current input to the power storage device 100, the stability of the charging voltage at both ends of the power storage device 100 is maintained.

[0046] Also, by arranging the first X capacitor 410 and the second X capacitor 420, a high-frequency current loop can be provided between one end of the inductor 210 on the battery self-heating device 1 and the power storage device 100, and the risk of high-frequency current saturation of the magnetic ring at the frequency is reduced as much as possible. Since the first X capacitor 410 and the second X capacitor 420 can absorb the differential-mode current between one end of the inductor 210 and the power storage device 100, the high-frequency differential-mode current components of the positive and negative electrodes of the power storage device 100 are reduced.

[0047] In this way, the battery self-heating device 1 according to this embodiment of the present disclosure can realize self-heating of the power storage device 100 both during vehicle running and when the vehicle is parked, ensure the vehicle's cruising range, and extend the service life of the power storage device 100.

[0048] In some specific embodiments of the present disclosure, the first X capacitor 410 is an X1 capacitor, and the second X capacitor 420 is an X2 capacitor. The first X capacitor 410 can withstand a high voltage of 2.5 kV to 4 kV, and the second X capacitor 420 can withstand a high voltage of 2.5 kV or less.

[0049] The first X capacitor 410 is a capacitor having a voltage stabilization and filtering function when the power storage device 100 supplies power to the IGBT of the bridge arm 310 of the control unit 300. During vehicle running, the power of the IGBT is large when the IGBT converts current. Therefore, the high-voltage withstand range of the first X capacitor 410 needs to be high.

[0050] The second X capacitor 420 is configured to absorb the differential mode current on the N line between the inductor 210 and the power storage device 100 when the power storage device 100 performs self-heating. From FIG. 1, it can be seen that the second X capacitor 420 is connected to the inductor 210 via the first contactor 430. When the power storage device 100 performs self-heating, the second X capacitor 420 conducts with the end of the inductor 210 connected to the power storage device 100. The power of the power storage device 100 for self-heating is smaller than the power of the IGBT when the current is converted during the running of the vehicle. Therefore, the high voltage withstand range of the second X capacitor 420 may be smaller than the high voltage withstand range of the first X capacitor 410.

[0051] In some specific embodiments of the present disclosure, as shown in FIG. 1, the first X capacitor 410 is connected to one end of the inductor 210 via the first contactor 430.

[0052] In other words, the first X capacitor 410 can be connected to the inductor 210 in an on / off manner via the first contactor 430. When the power storage device 100 needs to perform self-heating, the first contactor 430 is closed, so the first X capacitor 410 and the second X capacitor 420 are connected to one end of the inductor 210 via the first contactor 430. When the power storage device 100 does not need to perform self-heating, the first contactor 430 is open, and the first X capacitor 410 and the second X capacitor 420 cooperate to ensure the stability of the charging voltage and the discharging voltage of the power storage device 100.

[0053] In some specific embodiments of the present disclosure, as shown in FIG. 1, the inductor 210 is at least one phase winding of the motor 200.

[0054] In this way, since the battery self-heating device 1 and the motor 200 share the windings of the motor 200, the windings of the motor 200 are reused, and the usability of the windings of the motor 200 is improved. There is no need to separately arrange an inductor, which reduces the number of parts and manufacturing costs, and promotes the reduction of the overall volume of the battery self-heating device 1 and the motor 200.

[0055] In some specific embodiments of the present disclosure, as shown in FIG. 1, the inductor 210 is the three-phase windings of the motor 200. The control unit 300 is a motor controller, and the motor controller includes three-phase bridge arms 320. One ends of the three-phase windings are connected between a first power storage device 110 and a second power storage device 120 connected in series via an N wire 123 after being joined, and the other ends of the three-phase windings are respectively connected to the midpoints of the three-phase bridge arms 320.

[0056] In other words, the motor 200 may be a three-phase motor, and the motor 200 may be a drive motor or a generator. The three-phase windings are applied to the battery self-heating device 1, and the three-phase windings are connected to the three-phase bridge arms 320 of the motor controller in a one-to-one correspondence, thereby reducing the probability of ripple current generated by the battery self-heating device 1, further ensuring the voltage stability of the power storage device 100 during self-heating, and improving the electrical energy quality.

[0057] Furthermore, as shown in FIG. 1, the three-phase bridge arms 320 each include an upper bridge arm 321 and a lower bridge arm 322. After being joined, the three upper bridge arms 321 are connected to the positive electrode of the power storage device 100 via a self-heating safety device 500. The self-heating safety device 500 may be a fuse wire. By arranging the self-heating safety device 500, it is possible to prevent a part of the return current of the power storage device 100 during self-heating from short-circuiting with the current of the positive electrode of the power storage device 100, thereby improving the safety of the device.

[0058] In some specific embodiments of the present disclosure, as shown in FIG. 1, the battery self-heating device 1 further includes a hall 600. The three-phase bridge arms 320 and the three-phase windings are connected through a conductive structure 601. The hall 600 is sleeved on the conductive structure 601 and connected to the control unit 300. The conductive structure 601 may be a wire, a copper bar, or a combination thereof.

[0059] Therefore, the hall 600 can detect the current value on the conductive structure 601, and the joint ends of the three-phase windings are connected to the power storage device 100 through the N line. The hall may alternatively be arranged on the N line. As a result, when the power storage device 100 performs self-heating and the power storage device 100 increases the drive current for the bridge arm 310, the hall transmits the detection result to the control unit 300 to timely control the value and direction of the current on the conductive structure 601 and control the value and direction of the current on the N line, thereby improving the reliability of device control by timely refluxing the current in the battery self-heating device 1.

[0060] In some specific embodiments of the present disclosure, as shown in FIG. 1, the first power storage device 110 includes a first battery 111 and a first resistor 112 connected in series, and the second power storage device 120 includes a second battery 121 and a second resistor 122 connected in series.

[0061] In other words, the first resistor 112 is the internal resistance of the first power storage device 110, and the second resistor 122 is the internal resistance of the second power storage device 120. For example, the first resistor 112 and the second resistor 122 are located between the first battery 111 and the second battery 121, and the joint ends of the three-phase windings are connected between the first resistor 112 and the second resistor 122.

[0062] In this way, in the process of charging and discharging the first battery 111 and the second battery 121, an oscillating current flows through the first resistor 112 and the second resistor 122, generating heat in the first resistor 112 and the second resistor 122. In this case, the energy storage device 100 realizes self-heating as a whole.

[0063] In some specific embodiments of the present disclosure, the battery self-heating device 1 further includes a DC connector and a magnetic ring.

[0064] The positive electrode of the DC connector is connected to the positive electrode of the energy storage device 100, the negative electrode of the DC connector is connected to the negative electrode of the energy storage device 100, and the magnetic ring is sleeved on the DC connector. The DC connector may be connected to an external charging device by using a wire or other conductive structure to charge the energy storage device 100. For example, it may be connected to a charging pile.

[0065] In this way, since the magnetic ring can block external electromagnetic interference to the DC connector, the output voltage of the DC connector is more stable, thereby ensuring the stability of the charging voltage of the energy storage device 100 and further improving the cruising range of the vehicle.

[0066] In some specific embodiments of the present application, as shown in FIG. 3, the motor controller further includes a control panel 301.

[0067] The control panel is connected to three phase bridge arms 320 and is configured to control the three upper bridge arms 321 to be turned on or off simultaneously and control the three lower bridge arms 322 to be turned on or off simultaneously. The states of the three lower bridge arms 322 are opposite to the states of the three upper bridge arms 321.

[0068] That is, the motor controller can control the three upper bridge arms 321 to turn on synchronously and the three lower bridge arms 322 to turn off simultaneously by using the control panel. The motor controller can control the three upper bridge arms 321 to turn off synchronously and the three lower bridge arms 322 to conduct synchronously by using the control panel. In this way, the probability of the ripple current generated by the battery self-heating device 1 can be reduced, the stability of the output voltage and the input voltage of the power storage device 100 is further ensured, the temperature rise of the power storage device 100 becomes more reliable, and the electrical energy quality can be improved.

[0069] In some specific embodiments of the present disclosure, as shown in FIG. 1, the battery self-heating device 1 further includes a second contactor 700.

[0070] The second contactor 700 is respectively connected to one end of the inductor 210 and the power storage device 100, and is configured to control the connection and disconnection between one end of the inductor 210 and the power storage device 100.

[0071] Therefore, the power storage device 100 can be selectively heated by turning on / off the second contactor 700. When the temperature of the power storage device 100 is high or normal (for example, the temperature of the power storage device 100 is 20° C. or higher), the second contactor 700 may be turned off, no current flows through the battery self-heating device 1, and the power storage device 100 does not perform self-heating. Therefore, it is possible to avoid the temperature of the power storage device 100 from becoming too high, which helps to improve the electrical safety of the power storage device 100.

[0072] When the temperature of the power storage device 100 is low (for example, the temperature of the power storage device 100 is less than 10°C), the second contactor 700 may be closed first, and the power storage device 100, the bridge arm 310, and the inductor 210 may form a loop to achieve self-heating of the power storage device 100. After the temperature of the power storage device 100 has risen (for example, the temperature of the power storage device 100 has reached 20°C), the second contactor 700 is turned off. In this way, the temperature range of the power storage device 100 is guaranteed, and the temperature of the power storage device 100 is prevented from being heated excessively high, thereby improving the discharge performance of the power storage device 100 and obtaining higher safety.

[0073] Vehicle 1000 according to an embodiment of the present disclosure will be described below with reference to FIG. 4. Vehicle 1000 includes the battery self-heating device 1 according to the foregoing embodiment of the present disclosure.

[0074] According to the vehicle 1000 of the embodiment of the present disclosure, by using the battery self-heating device 1 according to the foregoing embodiment of the present disclosure, the power storage device 100 can achieve self-heating both during the running of the vehicle and when the vehicle is in a parked state, ensuring the cruising range of the vehicle 1000 and extending the service life of the power storage device 100.

[0075] Other components and operations of the battery self-heating device 1 and the vehicle 1000 equipped with the battery self-heating device according to the embodiment of the present disclosure are known to those skilled in the art and will not be repeated in detail here.

[0076] In the description of this specification, descriptions such as the reference terms "specific embodiment" and "specific example" are intended to indicate that the specific features, structures, materials, or characteristics described with reference to the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the general description of the foregoing terms is not necessarily directed to the same embodiment or example.

[0077] Although embodiments of the present disclosure have been illustrated and described, those skilled in the art should understand that various changes, modifications, substitutions, and variations can be made to the embodiments without departing from the principles and spirit of the present disclosure, and the scope of the present disclosure is defined by the appended claims and their equivalents.

Claims

1. A power storage device (100) including a first power storage device (110) and a second power storage device (120) arranged in series; An inductor (210) having one end connected between the first power storage device (110) and the second power storage device (120) arranged in series; A control unit (300) including at least one phase bridge arm (310), the other end of the inductor (210) being connected to the midpoint of the at least one phase bridge arm (310), and both ends of the at least one phase bridge arm (310) being connected to the positive electrode and the negative electrode of the power storage device (100) respectively; A capacitor (400) having both ends connected to the positive electrode and the negative electrode of the power storage device (100) respectively, including a first X capacitor (410) and a second X capacitor (420) connected in series, and the one end of the inductor (210) being connected between the first X capacitor (410) and the second X capacitor (420); A battery self-heating device (1) including the above.

2. The battery self-heating device (1) according to Claim 1, wherein the first X capacitor (410) is an X1 capacitor and the second X capacitor (420) is an X2 capacitor.

3. A first contactor (430) where the first X capacitor (410) is connected to the one end of the inductor (210) via the first contactor (430); The battery self-heating device (1) according to Claim 1 or 2, further including the above.

4. The battery self-heating device (1) according to any one of Claims 1 to 3, wherein the inductor (210) is at least one phase winding of a motor (200).

5. The battery self-heating device (1) according to Claim 4, wherein the inductor (210) is three phase windings of the motor (200), the control unit (300) is a motor controller, the motor controller includes three phase bridge arms (320), one ends of the three phase windings are connected between the first power storage device (110) and the second power storage device (120) arranged in series after being joined via an N line (123), and the other ends of the three phase windings are respectively connected to the midpoints of the three phase bridge arms (320).

6. The three phase bridge arms (320) are Three upper bridge arms (321) are connected to the positive electrode of the power storage device (100) via a self-heating safety device (500) after joining, the upper bridge arm (321), the lower bridge arm (322), and The battery self-heating device (1) according to claim 5, each including.

7. The battery self-heating device (1) according to claim 6, wherein the self-heating safety device (500) is a fuse wire.

8. A hole (600) sleeved on the conductive structure (601) to which the three-phase bridge arms (320) and the three-phase windings are connected via the conductive structure (601) and connected to the control unit (300). The battery self-heating device (1) according to any one of claims 5 to 7, further including.

9. The motor controller is Connected to the three-phase bridge arms (320), configured to control the three upper bridge arms (321) to turn off simultaneously and control the three lower bridge arms (322) to turn off simultaneously, and the states of the three lower bridge arms (322) are opposite to the states of the three upper bridge arms (321), a control panel (301). The battery self-heating device (1) according to any one of claims 6 to 8, further including.

10. The first power storage device (110) includes a first battery (111) and a first resistor (112) connected in series, and the second power storage device (120) includes a second battery (121) and a second resistor (122) connected in series. The battery self-heating device (1) according to any one of claims 1 to 9.

11. A second contactor (700) connected to the one end of the inductor (210) and the power storage device (100) and configured to control the connection and disconnection between the one end of the inductor (210) and the power storage device (100). The battery self-heating device (1) according to any one of claims 1 to 10, further including.

12. The power storage device (100) is a battery pack. The battery self-heating device (1) according to any one of claims 1 to 11.

13. The first X capacitor (410) can withstand a high voltage of 2.5 kV to 4 kV, and the second X capacitor (420) can withstand a high voltage of 2.5 kV or less. The battery self-heating device (1) according to any one of claims 1 to 11.

14. The first X capacitor (410) is an X1 capacitor, and the second X capacitor (420) is an X2 capacitor. The battery self-heating device (1) according to claim 13.

15. A vehicle (1000) including the battery self-heating device (1) according to any one of claims 1 to 14.

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