Battery self-heating circuit and vehicle

Abstract

a battery self-heating circuit including a first battery group, a second battery group, a first capacitor, a second capacitor, a multi-phase bridge arm, and multi-phase windings corresponding one-to-one to the multi-phase bridge arms, wherein each phase winding is connected to a midpoint of a corresponding bridge arm, a negative electrode of the first battery group is connected to a positive electrode of the second battery group, a negative electrode of the first battery group and a positive electrode of the second battery group are connected to a neutral point of the multi-phase windings, a positive electrode of the first battery group is connected to a first bus terminal of the multi-phase bridge arm, a negative electrode of the second battery group is connected to a second bus terminal of the multi-phase bridge arm, a first end of the second capacitor is connected to a second end of the first capacitor, a first end of the second capacitor and a second end of the first capacitor are connected to the neutral point of the multi-phase windings, a second end of the second capacitor is connected to a negative electrode of the second battery group, and a first end of the first capacitor is connected to a positive electrode of the first battery group.

Description

Technical Field

[0001] Cross - reference to Related Applications This disclosure claims the priority and benefit of Chinese Patent Application No. 202222636478.6, titled "BATTERY SELF - HEATING CIRCUIT, AND VEHICLE", filed on September 29, 2022. The entire content of the application referenced above is incorporated herein by reference.

[0002] The present invention relates to the field of battery self - heating technology, and specifically, to a battery self - heating circuit and a vehicle.

Background Art

[0003] In related technologies, battery self - heating technology is usually applied to battery packs for self - heating. The battery self - heating technology uses the cyclic charge - discharge of the battery and generates heat depending on the internal resistance of the battery. The battery self - heating technology has the advantages of fast heating speed, high heating efficiency, good temperature uniformity, and low cost, but the noise interference during self - heating also increases.

Summary of the Invention

Means for Solving the Problems

[0004] An object of the present invention is to provide a battery self - heating circuit and a vehicle to solve the problems in related technologies.

[0005] To achieve the above object, according to a first aspect of an embodiment of the present invention, a battery self - heating circuit is provided, including a first battery group, a second battery group, a first capacitor, a second capacitor, a plurality of phase - bridge arms, and a plurality of phase windings corresponding to the plurality of phase - bridge arms one - to - one, and each phase winding is connected to the mid - point of the corresponding bridge arm.

[0006] The negative terminal of the first battery group is connected to the positive terminal of the second battery group, and the negative terminal of the first battery group and the positive terminal of the second battery group are connected to the neutral point of multiple phase windings.

[0007] The positive terminal of the first battery group is connected to the first bus end of the multi-phase bridge arm, and the negative terminal of the second battery group is connected to the second bus end of the multi-phase bridge arm.

[0008] The first end of the second capacitor is connected to the second end of the first capacitor, the first end of the second capacitor and the second end of the first capacitor are connected to the neutral points of multiple phase windings, the second end of the second capacitor is connected to the negative electrode of the second battery group, and the first end of the first capacitor is connected to the positive electrode of the first battery group.

[0009] Optionally, the battery self-heating circuit further includes a first switch, the first end of the second capacitor and the second end of the first capacitor are connected to the neutral point of a plurality of phase windings via the first switch.

[0010] Optionally, the first switch is a contactor.

[0011] Optionally, the battery self-heating circuit further includes a second switch, the negative terminal of the first battery group and the positive terminal of the second battery group are connected to the neutral point of a plurality of phase windings via the second switch.

[0012] Optionally, multiple phase bridge arms are three phase bridge arms, and multiple phase windings are three phase windings.

[0013] Optionally, multiple phase coils of a motor can be reused as multiple phase windings, and multiple phase bridge arms of a motor controller can be reused as multiple phase bridge arms.

[0014] Optionally, the motor includes either a drive motor or an air conditioning compressor, and the motor controller includes either a motor controller corresponding to the drive motor or a motor controller corresponding to the air conditioning compressor.

[0015] Optionally, the battery self-heating circuit further includes a DC charging port, where the neutral points of the multiple phase windings are connected to the positive terminal of the DC charging port, and the second bus ends of the multiple phase bridge arms are connected to the negative terminal of the DC charging port. The multiple phase windings and the multiple phase bridge arms form a boost circuit, which is configured to boost the DC current of the DC charging port and then charge the first and second battery groups.

[0016] Optionally, the capacitance of the first capacitor is the same as the capacitance of the second capacitor.

[0017] Optionally, the capacitance of both the first and second capacitors is less than 10 μF.

[0018] A second aspect of the present invention further provides a vehicle equipped with the above-described battery self-heating circuit.

[0019] The present invention provides a battery self-heating circuit and a vehicle. The circuit includes a first battery group, a second battery group, a first capacitor, a second capacitor, a plurality of phase bridge arms, and a plurality of phase windings corresponding one-to-one with the plurality of phase bridge arms. Each phase winding is connected to the midpoint of the corresponding bridge arm. The first battery group and the plurality of phase windings work together to charge and discharge and implement self-heating of the first battery group. The first end of the first capacitor is connected to the positive terminal of the first battery group, and the second end of the first capacitor is connected to the neutral point of the plurality of phase windings, which is equivalent to the first capacitor being connected in parallel with the first battery group, so that the first capacitor can perform filtering and noise reduction when the first battery group self-heats. The second battery group and the plurality of phase windings work together to charge and discharge and implement self-heating of the second battery group. The first end of the second capacitor is connected to the neutral point of multiple phase windings, and the second end of the second capacitor is connected to the negative terminal of the second battery group. This is equivalent to the second capacitor being connected in parallel with the second battery group, so that the second capacitor can perform filtering and noise reduction when the second battery group self-heats. In this way, noise reduction of the battery pack's self-heating is implemented.

[0020] Other features and benefits of this disclosure are described in detail in the following detailed description section.

[0021] The accompanying drawings are provided for further understanding of this disclosure and constitute part of this specification. The accompanying drawings, along with specific implementations, are used to illustrate this disclosure and do not limit it. In the drawings, the following applies: [Brief explanation of the drawing]

[0022] [Figure 1] This is a circuit diagram of a battery self-heating circuit according to one embodiment of the present invention. [Figure 2]Circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 3] Circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 4] Circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 5] Circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 6] Circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 7] Circuit diagram of another battery self-heating circuit according to an embodiment of the present invention.

Description of Reference Numerals

[0023] 110 First battery group 120 Second battery group 130 Plurality of phase bridge arms 131 First bridge arm 132 Second bridge arm 133 Third bridge arm 140 Plurality of phase windings C1 First capacitor C2 Second capacitor C3 Third capacitor C4 Fourth capacitor K1 First switch K2 Second switch K3 Third switch K4 Fourth switch T1 First switching transistor T2 Second switching transistor T3 Third switching transistor T4 Fourth switching transistor T5 Fifth switching transistor T6 Sixth switching transistor

Embodiments for Carrying Out the Invention

[0024] The following describes in detail specific implementations of this disclosure with reference to the attached drawings. It should be understood that the specific implementations described herein are for illustrative and interpretive purposes only and do not limit the invention.

[0025] Terms such as "first" and "second" are used in this disclosure to distinguish one element from another and do not indicate order or importance. Furthermore, in the following description, where drawings are referenced, unless otherwise stated, the same drawing reference numerals in different drawings represent the same or similar elements.

[0026] With the continuous advancement of vehicle technology, battery packs are rapidly developing as power supply components for new energy vehicles. The operating characteristics of battery packs are greatly affected by ambient temperature, and the capacity of battery packs is low in low-temperature environments. Therefore, battery packs need to be heated at low temperatures to maintain normal operating conditions.

[0027] In related technologies, battery self-heating technology is typically applied to battery packs for self-heating. Battery self-heating technology uses the cyclical charging and discharging of the battery and generates heat depending on the battery's internal resistance. Battery self-heating technology has advantages such as a fast heating rate, high heating efficiency, good temperature uniformity, and low cost, but it also increases noise interference during self-heating.

[0028] One embodiment of the present invention provides a battery self-heating circuit. As shown in Figure 1, the battery self-heating circuit includes a first battery group 110, a second battery group 120, a first capacitor C1, a second capacitor C2, a plurality of phase bridge arms 130, and a plurality of phase windings 140 that correspond one-to-one with the plurality of phase bridge arms 130. Each phase winding is connected to the midpoint of the corresponding bridge arm.

[0029] The negative terminal of the first battery group 110 is connected to the positive terminal of the second battery group 120, and the negative terminal of the first battery group 110 and the positive terminal of the second battery group 120 are connected to the neutral point of the multiple phase windings 140. The positive terminal of the first battery group 110 is connected to the first bus end of the multiple phase bridge arms 130, and the negative terminal of the second battery group 120 is connected to the second bus end of the multiple phase bridge arms 130.

[0030] The first end of the second capacitor C2 is connected to the second end of the first capacitor C1, the first end of the second capacitor C2 and the second end of the first capacitor C1 are connected to the neutral point of a plurality of phase windings 140, the second end of the second capacitor C2 is connected to the negative electrode of the second battery group 120, and the first end of the first capacitor C1 is connected to the positive electrode of the first battery group 110.

[0031] The first battery group 110 and the second battery group 120 belong to the same battery pack. Switching transistors in the multiple phase bridge arms 130 are controlled to switch between closed and open states, so that the first battery group 110 discharges to charge the multiple phase windings 140, the multiple phase windings 140 discharge to charge the first battery group 110, the second battery group 120 discharges to charge the multiple phase windings 140, and the multiple phase windings 140 discharge to charge the second battery group 120. The first battery group 110 and the multiple phase windings 140 cooperate to charge and discharge each other, and the second battery group 120 and the multiple phase windings 140 cooperate to charge and discharge each other, thereby implementing self-heating of the first battery group 110 and the second battery group 120.

[0032] In the process of the first battery group 110 discharging and charging the multiple phase windings 140, the upper bridge arms of the multiple phase bridge arms 130 are turned on and the lower bridge arms are turned off. The charging current flows from the positive terminal of the first battery group 110, charges the multiple phase windings 140 through the upper bridge arms of the multiple phase bridge arms 130, and then returns to the negative terminal of the first battery group 110 through the neutral points of the multiple phase windings 140.

[0033] In the process of the multiple phase windings 140 discharging to charge the second battery group 120, the lower bridge arm of the multiple phase bridge arm 130 is turned on and the upper bridge arm is turned off. The charging current flows from the multiple phase windings 140, through the neutral point of the multiple phase windings 140 to the positive terminal of the second battery group 120, charging the second battery group 120, and then returns to the multiple phase windings 140 through the negative terminal of the second battery group 120 and the lower bridge arm of the multiple phase bridge arm 130.

[0034] In the process of the second battery group 120 discharging and charging the multiple phase windings 140, the lower bridge arm of the multiple phase bridge arm 130 is turned on and the upper bridge arm is turned off. The charging current flows from the positive terminal of the second battery group 120, passes through the neutral point of the multiple phase windings 140 to charge the multiple phase windings 140, and then returns to the negative terminal of the second battery group 120 through the lower bridge arm of the multiple phase bridge arm 130.

[0035] In the process of the multiple phase windings 140 discharging to charge the first battery group 110, the upper bridge arm of the multiple phase bridge arm 130 is turned on and the lower bridge arm is turned off. The charging current flows from the multiple phase windings 140, passes through the upper bridge arm of the multiple phase bridge arm 130 to the positive terminal of the first battery group 110, charges the first battery group 110, and then passes through the negative terminal of the first battery group 110 and the neutral point of the multiple phase windings 140 and returns to the multiple phase windings 140.

[0036] Multiple phase bridge arms 130 and multiple phase windings 140 connected to the multiple phase bridge arms 130 in a one-to-one correspondence are considered as a single connection unit. During charging and discharging of the first battery group 110, the connection part, the first battery group 110, and the first capacitor C1 are in a parallel relationship. The first capacitor C1 performs filtering during charging and discharging of the first battery group 110 to implement noise reduction during charging and discharging of the first battery group 110. During charging and discharging of the second battery group 120, the connection part, the second battery group 120, and the second capacitor C2 are in a parallel relationship. The second capacitor C2 performs filtering during charging and discharging of the second battery group 120 to implement noise reduction during charging and discharging of the second battery group 120.

[0037] Through the technical solutions described above, the first battery group 110 and the multiple phase windings 140 cooperate to charge and discharge in order to implement the self-heating of the first battery group 110. The first end of the first capacitor C1 is connected to the positive electrode of the first battery group 110, and the second end of the first capacitor C1 is connected to the neutral point of the multiple phase windings 140, which is equivalent to the first capacitor C1 being connected in parallel with the first battery group 110, so that the first capacitor C1 can perform filtering and noise reduction during the self-heating of the first battery group 110. The second battery group 120 and the multiple phase windings cooperate to charge and discharge in order to implement the self-heating of the second battery group 120. The first end of the second capacitor C2 is connected to the neutral point of the multiple phase windings 140, and the second end of the second capacitor C2 is connected to the negative terminal of the second battery group 120. This is equivalent to the second capacitor C2 being connected in parallel with the second battery group 120, so that the second capacitor C2 can perform filtering and noise reduction during the self-heating of the second battery group 120. In this way, noise reduction of the self-heating of the battery pack is implemented.

[0038] In one implementation configuration, as shown in Figure 2, the battery self-heating circuit further includes a first switch K1, and the first end of the second capacitor C2 and the second end of the first capacitor C1 are connected to the neutral point of a plurality of phase windings 140 via the first switch K1.

[0039] It can be understood that the connection point between the first end of the second capacitor C2 and the second end of the first capacitor C1 is connected to the neutral point of the multiple phase windings 140 via a first switch K1. The first switch K1 is configured to control access to the first capacitor C1 and the second capacitor C2, i.e., to determine whether the noise reduction function is enabled. When the first switch K1 is turned on, the first end of the second capacitor C2 and the second end of the first capacitor C1 are connected to the neutral point of the multiple phase windings 140, allowing noise reduction to be performed during the self-heating of the battery pack. When the first switch K1 is turned off, the first end of the second capacitor C2 and the second end of the first capacitor C1 are disconnected from the neutral point of the multiple phase windings 140, preventing noise reduction from being performed during the self-heating of the battery pack.

[0040] In other words, by controlling whether or not to enable the noise reduction function via the first switch K1, it is possible to implement control over the start and stop of the noise reduction function by performing noise reduction when the battery pack generates its own heat and not performing noise reduction at other times.

[0041] In one implementation configuration, the first switch K1 is a contactor.

[0042] In one implementation configuration, as shown in Figure 3, the battery self-heating circuit further includes a second switch K2, and the negative terminal of the first battery group 110 and the positive terminal of the second battery group 120 are connected to the neutral points of the multiple phase windings 140 via the second switch K2.

[0043] It can be understood that the connection point between the negative terminal of the first battery group 110 and the positive terminal of the second battery group 120 is connected to the neutral point of the multiple phase windings 140 via a second switch K2. The second switch K2 is configured to control access to the first battery group 110 and the second battery group 120, i.e., to determine whether self-heating is enabled. When the second switch K2 is turned on, the negative terminal of the first battery group 110 and the positive terminal of the second battery group 120 are connected to the neutral point of the multiple phase windings 140, and the battery pack can perform self-heating. When the second switch K2 is turned off, the negative terminal of the first battery group 110 and the positive terminal of the second battery group 120 are disconnected from the neutral point of the multiple phase windings 140, and the battery pack cannot perform self-heating.

[0044] In other words, the second switch K2 can be used to control whether or not self-heating is enabled. When the battery pack requires self-heating, the second switch K2 is turned on and the circuit is made conductive, and when the battery pack does not require self-heating, the second switch K2 is turned off, thereby implementing control over the start and stop of the self-heating function and further ensuring the safety of the vehicle and the battery pack.

[0045] Specifically, the second switch K2 may be a contactor.

[0046] In one embodiment, the multiple phase bridge arms 130 may consist of three phase bridge arms, and the multiple phase windings 140 may consist of three phase windings.

[0047] The multiple phase bridge arms 130 consist of three phase bridge arms, specifically including a first bridge arm 131, a second bridge arm 132, and a third bridge arm 133. The multiple phase windings 140 consist of three phase windings, specifically including a first phase winding, a second phase winding, and a third phase winding. The first bridge arm 131 is connected to the first phase winding, the second bridge arm 132 is connected to the second phase winding, and the third bridge arm 133 is connected to the third phase winding.

[0048] The first bridge arm 131 includes a first switching transistor T1 and a second switching transistor T2, the second bridge arm 132 includes a third switching transistor T3 and a fourth switching transistor T4, and the third bridge arm 133 includes a fifth switching transistor T5 and a sixth switching transistor T6. The first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5 form the upper bridge arms of the plurality of phase bridge arms 130, and the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 form the lower bridge arms of the plurality of phase bridge arms 130.

[0049] The drains of the first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5 are all connected to the first bus terminal, and the sources of the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 are all connected to the second bus terminal. The source of the first switching transistor T1 is connected to the drain of the second switching transistor T2, and the source of the first switching transistor T1 and the drain of the second switching transistor T2 are connected to the first phase winding. The source of the third switching transistor T3 is connected to the drain of the second switching transistor T2, and the source of the third switching transistor T3 and the drain of the second switching transistor T2 are connected to the second phase winding. The source of the fifth switching transistor T5 is connected to the drain of the sixth switching transistor T6, and the source of the fifth switching transistor T5 and the drain of the sixth switching transistor T6 are connected to the third phase winding.

[0050] In other embodiments of the present disclosure, the plurality of phase bridge arms 130 may be six phase bridge arms, and the plurality of phase windings 140 may be six phase windings.

[0051] In one embodiment, the multiple phase coils of the motor are reused as multiple phase windings 140, and the multiple phase bridge arms of the motor controller are reused as multiple phase bridge arms 130.

[0052] Specifically, the motor includes a drive motor or an air conditioning compressor, and the motor controller includes a motor controller corresponding to the drive motor or a motor controller corresponding to the air conditioning compressor.

[0053] In other words, the battery self-heating circuit can share multiple phase windings 140 and multiple phase bridge arms 130 with the existing motor and motor controller on the vehicle without adding any additional components, thereby saving space and resources.

[0054] In other embodiments of the present disclosure, the multiple phase bridge arms 130 may alternatively be multiple phase bridge arms 130 in an inverter on a vehicle, and the multiple phase windings 140 may be multiple phase windings 140 in a motor on a vehicle.

[0055] In one implementation configuration, the battery self-heating circuit further includes a DC charging port. The neutral points of the multiple phase windings 140 are connected to the positive terminal of the DC charging port, and the second bus ends of the multiple phase bridge arms 130 are connected to the negative terminal of the DC charging port. The multiple phase windings 140 and the multiple phase bridge arms 130 form a boost circuit. Boost The circuit uses the DC current from the DC charging port. Boost The system is configured to charge the first battery group 110 and the second battery group 120.

[0056] An external charging device can charge the battery pack via a DC charging port. The external charging device may be, but is not limited to, a charging connector, a charging pile, or another vehicle.

[0057] Alternatively, the battery pack can power another electrical device via a DC charging port. This other electrical device may, but is not limited to, a mobile phone, an audio speaker, or another vehicle.

[0058] In other words, the interaction between the battery self-heating circuit and the outside may be implemented via a DC charging port, which increases the number of applicable scenarios for the battery self-heating circuit and improves its applicability.

[0059] In other embodiments of the present invention, the battery self-heating circuit may further include a third capacitor C3, a fourth capacitor C4, a third switch K3, and a fourth switch K4. The first end of the third capacitor C3 is connected to the positive terminal of the first battery group 110, and the second end of the third capacitor C3 is connected to the negative terminal of the second battery group 120. The first end of the fourth capacitor C4 is connected to the positive terminal of the DC charging port, and the second end of the fourth capacitor C4 is connected to the negative terminal of the DC charging port via the fourth switch K4. The third switch K3 is connected between the neutral points of the multiple phase windings 140 and the positive terminal of the DC charging port. The fourth switch K4 is connected between the negative terminal of the second battery group 120 and the negative terminal of the DC charging port.

[0060] A third switch K3 is configured to control the connection of a fourth capacitor C4. When the third switch (K3) is turned on, the fourth capacitor (C4) is connected, and when the third switch (K3) is turned off, the fourth capacitor (C4) is not connected. Based on this, the fourth switch K4 is configured to control the connection of a DC charging port. When the fourth switch K4 is turned on, the DC charging port is connected, and when the fourth switch K4 is turned off, the DC charging port is not connected, and as a result, the interaction of the battery self-heating circuit with the outside is controlled.

[0061] In one implementation configuration, the capacitance of the first capacitor C1 is the same as the capacitance of the second capacitor C2.

[0062] In timing sequence 1, the first battery group 110 discharges and charges the multiple phase windings 140, and the first capacitor C1 operates. In timing sequence 2, the multiple phase windings 140 discharge and charge the second battery group 120, and the second capacitor C2 operates. In timing sequence 3, the second battery group 120 discharges and charges the multiple phase windings 140, and the second capacitor C2 operates. In timing sequence 4, the multiple phase windings 140 discharge and charge the first battery group 110, and the first capacitor C1 operates.

[0063] The capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 are the same, and the noise reduction capability of the first capacitor C1 and the noise reduction capability of the second capacitor C2 are the same. The noise reduction effect of the first capacitor C1 during charging and discharging of the first battery group 110 is the same as the noise reduction effect of the second capacitor C2 during charging and discharging of the second battery group 120. In this way, the noise reduction effect in the self-heating process of the battery pack is stable.

[0064] In one embodiment, the capacitance of both the first capacitor C1 and the second capacitor C2 is less than 10 μF.

[0065] The capacitance of the first capacitor C1 is less than 10 μF, and the capacitance of the second capacitor C2 is also less than 10 μF. If the capacitances of the first capacitor C1 and the second capacitor C2 are too large, it will affect the self-heating current.

[0066] The operating principle of a battery self-heating circuit will be explained using a three-phase bridge arm and three-phase windings as examples.

[0067] Timing sequence 1: The first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5 are turned on, and the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 are turned off. As shown in Figure 4, the charging current flows from the positive terminal of the first battery group 110, charges the three-phase windings via the first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5, and then returns to the negative terminal of the first battery group 110 via the neutral point of the three-phase windings. The first capacitor C1 is connected in parallel with the first battery group 110.

[0068] Timing sequence 2: The first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5 are turned off, and the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 are turned on. As shown in Figure 5, the charging current flows from the three phase windings, through the neutral points of the three phase windings to the positive terminal of the second battery group 120, charging the second battery group 120, and then back to the three phase windings from the negative terminal of the second battery group 120 through the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6. The second capacitor C2 is connected in parallel with the second battery group 120.

[0069] Discharging of the first battery group 110 and charging of the second battery group 120 are implemented through switching between timing sequence 1 and timing sequence 2.

[0070] Timing sequence 3: The first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5 are turned off, and the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 are turned on. As shown in Figure 6, the charging current flows from the positive terminal of the second battery group 120, charges the three phase windings through the neutral point of the three phase windings, and then returns to the negative terminal of the second battery group 120 through the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6. The second capacitor C2 is connected in parallel with the second battery group 120.

[0071] Timing sequence 4: The first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5 are turned on, and the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 are turned off. As shown in Figure 7, the charging current flows from the three phase windings, passes through the first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5 to the positive terminal of the first battery group 110, charges the first battery group 110, and then returns from the negative terminal of the first battery group 110 through the neutral points of the three phase windings to the three phase windings. The first capacitor C1 is connected in parallel with the first battery group 110.

[0072] Charging of the first battery group 110 and discharging of the second battery group 120 are implemented through switching between timing sequence 3 and timing sequence 4.

[0073] Charging and discharging of the first battery group 110 and the second battery group 120 are implemented through switching between timing sequences 1 and 2, and between timing sequences 3 and 4.

[0074] An example of the present invention further provides a vehicle which includes a battery self-heating circuit according to the above example.

[0075] Although exemplary embodiments of the present invention have been described in detail above with reference to the drawings, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical idea of ​​this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and all such simple modifications shall fall within the scope of protection of this disclosure.

[0076] It should be further noted that the specific technical features described in the particular embodiments above can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, various possible combinations are not further described in this disclosure.

[0077] Furthermore, various embodiments of this disclosure may be combined without departing from the concepts of this disclosure, and such combinations shall also fall within the scope of this disclosure.

Claims

1. A battery self-heating circuit comprising a first battery group (110), a second battery group (120), a first capacitor (C1), a second capacitor (C2), a plurality of phase bridge arms (130), and a plurality of phase windings (140) corresponding one-to-one with the plurality of phase bridge arms (130), wherein each phase winding is connected to the midpoint of the corresponding bridge arm, the negative electrode of the first battery group (110) is connected to the positive electrode of the second battery group (120), and the negative electrode of the first battery group (110) and the positive electrode of the second battery group (120) are connected to the neutral point of the plurality of phase windings (140). The positive terminal of the first battery group (110) is connected to the first bus end of the plurality of phase bridge arms (130), and the negative terminal of the second battery group (120) is connected to the second bus end of the plurality of phase bridge arms (130), The first end of the second capacitor (C2) is connected to the second end of the first capacitor (C1), the first end of the second capacitor (C2) and the second end of the first capacitor (C1) are connected to the neutral point of the plurality of phase windings (140), the second end of the second capacitor (C2) is connected to the negative electrode of the second battery group (120), and the first end of the first capacitor (C1) is connected to the positive electrode of the first battery group (110). In the first timing sequence, the upper bridge arm (130) turns on and the lower bridge arm turns off, causing the first battery group (110) to discharge and charge the multiple phase windings (140). In the second timing sequence, the lower bridge arm (130) turns on and the upper bridge arm turns off, causing the multiple phase windings (140) to discharge and charge the second battery group (120). In the third timing sequence, the lower bridge arm (130) of the plurality of phase bridge arms (130) turns on and the upper bridge arm turns off, causing the second battery group (120) to discharge and charge the plurality of phase windings (140). In the fourth timing sequence, the upper bridge arm (130) turns on and the lower bridge arm turns off, causing the multiple phase windings (140) to discharge and charge the first battery group (110). The first capacitor (C1) performs filtering in the first timing sequence and the fourth timing sequence to reduce noise, and the second capacitor (C2) performs filtering in the second timing sequence and the third timing sequence to reduce noise. Battery self-heating circuit.

2. The device further comprises a first switch (K1), wherein the first end of the second capacitor (C2) and the second end of the first capacitor (C1) are connected to the neutral point of the plurality of phase windings (140) via the first switch (K1). The battery self-heating circuit according to claim 1.

3. The first switch (K1) is a contactor. The battery self-heating circuit according to claim 2.

4. The system further comprises a second switch (K2), wherein the negative electrode of the first battery group (110) and the positive electrode of the second battery group (120) are connected to the neutral point of the plurality of phase windings (140) via the second switch (K2). The battery self-heating circuit according to claim 1.

5. Multiple phase coils of the motor are reused as the multiple phase windings (140), and multiple phase bridge arms (130) of the motor controller are reused as the multiple phase bridge arms (130). The battery self-heating circuit according to claim 1.

6. The motor includes a drive motor or an air conditioning compressor, and the motor controller includes a motor controller corresponding to the drive motor or a motor controller corresponding to the air conditioning compressor. The battery self-heating circuit according to claim 5.

7. The device further comprises a DC charging port, wherein the neutral points of the plurality of phase windings (140) are connected to the positive terminal of the DC charging port, and the second bus ends of the plurality of phase bridge arms (130) are connected to the negative terminal of the DC charging port, and the plurality of phase windings (140) and the plurality of phase bridge arms (130) form a boost circuit, which is configured to boost the DC of the DC charging port and then charge the first battery group (110) and the second battery group (120). The battery self-heating circuit according to claim 1.

8. The capacitance of the first capacitor (C1) is the same as the capacitance of the second capacitor (C2). The battery self-heating circuit according to claim 1.

9. The capacitance of the first capacitor (C1) and the capacitance of the second capacitor (C2) are both less than 10 μF. The battery self-heating circuit according to claim 8.

10. A vehicle comprising a battery self-heating circuit as described in any one of claims 1 to 9.

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