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 priority to and the benefit of Chinese Patent Application No. 202222636478.6, entitled "BATTERY SELF-HEATING CIRCUIT, AND VEHICLE," filed on September 29, 2022. The entire contents of the above-referenced application are incorporated herein by reference.

[0002] The present invention relates to the field of battery self-heating technology, and more particularly to battery self-heating circuits and vehicles. [Background technology]

[0003] In related technology, battery self-heating technology is typically applied to battery packs to prevent self-heating. Battery self-heating technology uses cyclic charging and discharging of the battery and relies on the battery's internal resistance to generate heat. Battery self-heating technology has the advantages of fast heating speed, high heating efficiency, good temperature uniformity, and low cost, but also increases noise interference during self-heating. Summary of the Invention [Means for solving the problem]

[0004] SUMMARY OF THE INVENTION The present invention aims to provide a battery self-heating circuit and a vehicle to solve the problems in the related art.

[0005] To achieve the above object, according to a first aspect of an embodiment of the present invention, there is provided a battery self-heating circuit 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 one-to-one to the plurality of phase bridge arms, wherein each phase winding is connected to a midpoint of a corresponding bridge arm.

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

[0007] The positive electrodes of the first battery group are connected to first bus ends of the plurality of phase bridge arms, and the negative electrodes of the second battery group are connected to second bus ends of the plurality of phase bridge arms.

[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 neutral points of the 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, wherein the first end of the second capacitor and the second end of the first capacitor are connected to neutral points of the 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, wherein the negative pole of the first battery group and the positive pole of the second battery group are connected to neutral points of the multiple phase windings via the second switch.

[0012] Optionally, the plurality of phase bridge arms are three phase bridge arms and the plurality of phase windings are three phase windings.

[0013] Optionally, multiple phase coils of the motor are reused as multiple phase windings and multiple phase bridge arms of the motor controller are reused as multiple phase bridge arms.

[0014] Optionally, the motor comprises a drive motor or an air conditioning compressor, and the motor controller comprises 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, wherein neutral points of the multiple phase windings are connected to a positive pole of the DC charging port, and second bus ends of the multiple phase bridge arms are connected to a negative pole of the DC charging port. The multiple phase windings and the multiple phase bridge arms form a boost circuit, and the boost circuit is configured to boost a direct current of the DC charging port and then charge the first battery group and the second battery group.

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

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

[0018] According to a second aspect of the present invention, there is further provided a vehicle including the above 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, multiple phase bridge arms, and multiple phase windings corresponding to the multiple phase bridge arms in a one-to-one correspondence. Each phase winding is connected to the midpoint of a corresponding bridge arm. The first battery group and the multiple phase windings cooperate to charge and discharge, thereby suppressing self-heating of the first battery group. A first end of the first capacitor is connected to the positive electrode of the first battery group, and a second end of the first capacitor is connected to the neutral point of the multiple phase windings. This is equivalent to connecting the first capacitor in parallel with the first battery group, so that the first capacitor can filter and reduce noise when self-heating of the first battery group occurs. The second battery group and the multiple phase windings cooperate to charge and discharge, thereby suppressing self-heating of the second battery group. The first end of the second capacitor is connected to the neutral point of the multiple phase windings, and the second end of the second capacitor is connected to the negative pole of the second battery group, which is equivalent to connecting the second capacitor 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, thereby achieving noise reduction due to self-heating of the battery pack.

[0020] Other features and advantages of the present disclosure are described in detail in the detailed description section below.

[0021] The accompanying drawings are provided to provide a further understanding of the present disclosure and constitute a part of this specification. The accompanying drawings, together with specific implementations, are used to explain the present disclosure and are not intended to limit the present disclosure. In the drawings: [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 2 is a circuit diagram of a battery self-heating circuit according to one embodiment of the present invention. [Figure 2]FIG. 10 is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 3] FIG. 10 is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 4] FIG. 10 is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 5] FIG. 10 is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 6] FIG. 10 is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Figure 7] FIG. 10 is a circuit diagram of another battery self-heating circuit according to an embodiment of the present invention. [Explanation of symbols]

[0023] 110 First Battery Group 120 Second Battery Group 130 Multiple Phase Bridge Arms 131 First Bridge Arm 132 Second Bridge Arm 133 Third Bridge Arm 140 Multiple Phase Windings C1 First capacitor C2 Second capacitor C3 Third capacitor C4 Fourth capacitor K1 First switch K2 Second switch K3 Third Switch K4 4th 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 DETAILED DESCRIPTION OF THE INVENTION

[0024] Specific implementations of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific implementations described herein are merely for the purpose of illustrating and interpreting the present invention, and are not intended to limit the present invention.

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

[0026] With the continuous development of vehicle technology, battery packs are rapidly developing as a power supply component 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 technology, battery self-heating technology is typically applied to battery packs to prevent self-heating. Battery self-heating technology uses cyclic charging and discharging of the battery and relies on the battery's internal resistance to generate heat. Battery self-heating technology has the advantages of fast heating speed, high heating efficiency, good temperature uniformity, and low cost, but also increases noise interference during self-heating.

[0028] 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 corresponding to the plurality of phase bridge arms 130 in a one-to-one relationship. Each phase winding is connected to the midpoint of the corresponding bridge arm.

[0029] The negative pole of the first battery group 110 is connected to the positive pole of the second battery group 120, and the negative pole of the first battery group 110 and the positive pole of the second battery group 120 are connected to the neutral points of the multiple phase windings 140. The positive pole of the first battery group 110 is connected to first bus ends of the multiple phase bridge arms 130, and the negative pole of the second battery group 120 is connected to second bus ends 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 the multiple 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. The switching transistors in the multiple phase bridge arms 130 are controlled to switch between a closed state and an open state, so that the first battery group 110 discharges and charges the multiple phase windings 140, the multiple phase windings 140 discharge and charge the first battery group 110, the second battery group 120 discharges and charges the multiple phase windings 140, and the multiple phase windings 140 discharge and 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 discharging the first battery group 110 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. A charging current flows from the positive pole 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 pole of the first battery group 110 through the neutral points of the multiple phase windings 140.

[0033] In the process of discharging the multiple phase windings 140 and charging the second battery group 120, the lower bridge arms of the multiple phase bridge arms 130 are turned on and the upper bridge arms are turned off. The charging current flows from the multiple phase windings 140, through the neutral points of the multiple phase windings 140 to the positive terminals of the second battery group 120, charges the second battery group 120, and then returns to the multiple phase windings 140 through the negative terminals of the second battery group 120 and the lower bridge arms of the multiple phase bridge arms 130.

[0034] In the process of discharging the second battery group 120 and charging the multiple phase windings 140, the lower bridge arms of the multiple phase bridge arms 130 are turned on and the upper bridge arms are turned off. A charging current flows from the positive pole of the second battery group 120, passes through the neutral points of the multiple phase windings 140 to charge the multiple phase windings 140, and then returns to the negative pole of the second battery group 120 through the lower bridge arms of the multiple phase bridge arms 130.

[0035] In the process of discharging the multiple phase windings 140 and charging the first battery group 110, 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 multiple phase windings 140, passes through the upper bridge arms of the multiple phase bridge arms 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] The multiple phase bridge arms 130 and the multiple phase windings 140 connected to the multiple phase bridge arms 130 in a one-to-one correspondence are regarded as one connection unit. During charging and discharging of the first battery group 110, the connection unit, the first battery group 110, and the first capacitor C1 are connected in parallel. The first capacitor C1 performs filtering during charging and discharging of the first battery group 110, thereby implementing noise reduction during charging and discharging of the first battery group 110. During charging and discharging of the second battery group 120, the connection unit, the second battery group 120, and the second capacitor C2 are connected in parallel. The second capacitor C2 performs filtering during charging and discharging of the second battery group 120, thereby implementing noise reduction during charging and discharging of the second battery group 120.

[0037] Through the above-mentioned technical solution, the first battery group 110 and the multiple phase windings 140 cooperate to charge and discharge to realize self-heating of the first battery group 110. A first end of the first capacitor C1 is connected to the positive electrode of the first battery group 110, and a 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 self-heating of the first battery group 110. The second battery group 120 and the multiple phase windings cooperate to charge and discharge to realize self-heating of the second battery group 120. A first end of the second capacitor C2 is connected to the neutral point of the multiple phase windings 140, and a second end of the second capacitor C2 is connected to the negative pole of the second battery group 120, which 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 self-heating of the second battery group 120. In this way, noise reduction due to self-heating of the battery pack is implemented.

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

[0039] It can be seen 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 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 self-heating of the battery pack.

[0040] In other words, by controlling whether or not the noise reduction function is enabled via the first switch K1, noise reduction is performed when the battery pack self-heats, and noise reduction is not performed at other times, thereby implementing start-stop control of the noise reduction function.

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

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

[0043] It can be seen 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 of 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, whether to enable self-heating can be controlled via the second switch K2. When the battery pack needs self-heating, the second switch K2 is turned on to establish a circuit, and when the battery pack does not need self-heating, the second switch K2 is turned off, thereby implementing start-stop control of the self-heating function and further ensuring the safety of the vehicle and the battery pack.

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

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

[0047] The multiple phase bridge arms 130 may be 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 may be 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 an upper bridge arm of the multiple phase bridge arms 130, and the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 form a lower bridge arm of the multiple 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 a first bus end, the sources of the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 are all connected to a second bus end, the source of the first switching transistor T1 is connected to the drain of the second switching transistor T2, the source of the first switching transistor T1 and the drain of the second switching transistor T2 are connected to a first phase winding, the source of the third switching transistor T3 is connected to the drain of the second switching transistor T2, the source of the third switching transistor T3 and the drain of the second switching transistor T2 are connected to a 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 a 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 conditioner compressor, and the motor controller includes a motor controller corresponding to the drive motor or a motor controller corresponding to the air conditioner compressor.

[0053] In other words, the battery self-heating circuit can share the existing motor and motor controller on the vehicle without adding multiple phase windings 140 and multiple phase bridge arms 130, 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 the vehicle, and the multiple phase windings 140 may be multiple phase windings 140 in a motor on the vehicle.

[0055] In one implementation, 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 pole of the DC charging port, and the second bus ends of the multiple phase bridge arms 130 are connected to the negative pole of the DC charging port. The multiple phase windings 140 and the multiple phase bridge arms 130 form a boost circuit. The boost circuit is configured to boost the direct current of the DC charging port to charge the first battery group 110 and the second battery group 120.

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

[0057] Alternatively, the battery pack can power another electrical device through the DC charging port, such as, but not limited to, a mobile phone, an audio speaker, another vehicle, etc.

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

[0059] In another embodiment 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. A first end of the third capacitor C3 is connected to the positive terminal of the first battery group 110, and a second end of the third capacitor C3 is connected to the negative terminal of the second battery group 120. A first end of the fourth capacitor C4 is connected to the positive terminal of the DC charging port, and a 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 point 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] The third switch K3 is configured to control the connection of the 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 the 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, thereby controlling the interaction of the battery self-heating circuit with the outside.

[0061] In one implementation, 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 is activated. In timing sequence 2, the multiple phase windings 140 discharge and charge the second battery group 120, and the second capacitor C2 is activated. In timing sequence 3, the second battery group 120 discharges and charges the multiple phase windings 140, and the second capacitor C2 is activated. In timing sequence 4, the multiple phase windings 140 discharge and charge the first battery group 110, and the first capacitor C1 is activated.

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

[0064] In one embodiment, the capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 are both 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 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] Taking three phase bridge arms and three phase windings as an example, the working principle of the battery self-heating circuit is explained.

[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, charging current flows from the positive terminal of the first battery group 110, charges the three-phase winding through 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 through the neutral point of the three-phase winding. A 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, 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 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, and back to the three phase windings. A second capacitor C2 is connected in parallel with the second battery group 120.

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

[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, charging current flows from the positive terminal of the second battery group 120, charges the three phase windings through the neutral points 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. A 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, 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 flows from the negative terminal of the first battery group 110 through the neutral points of the three phase windings and back to the three phase windings. A first capacitor C1 is connected in parallel with the first battery group 110.

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

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

[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 the 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 in the above embodiments. Within the technical idea of ​​the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and all such simple modifications shall fall within the protection scope of the present disclosure.

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

[0077] Furthermore, various embodiments of the present disclosure may be combined without departing from the concepts of the present disclosure, and such combinations are intended to fall within the scope of the present 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 to the plurality of phase bridge arms (130), wherein each phase winding is connected to a midpoint of a corresponding bridge arm, a negative pole of the first battery group (110) is connected to a positive pole of the second battery group (120), and the negative pole of the first battery group (110) and the positive pole of the second battery group (120) are connected to a neutral point of the plurality of phase windings (140); The positive terminals of the first battery group (110) are connected to first bus ends of the plurality of phase bridge arms (130), and the negative terminals of the second battery group (120) are connected to second bus ends of the plurality of phase bridge arms (130); a first end of the second capacitor (C2) connected to a second end of the first capacitor (C1); the first end of the second capacitor (C2) and the second end of the first capacitor (C1) connected to the neutral point of the plurality of phase windings (140); the second end of the second capacitor (C2) connected to the negative electrode of the second battery group (120); and the first end of the first capacitor (C1) connected to the positive electrode of the first battery group (110). Battery self-heating circuit.

2. 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 points of the plurality of phase windings (140) via the first switch (K1); 2. The battery self-heating circuit of claim 1.

3. the first switch (K1) is a contactor; 3. The battery self-heating circuit of claim 2.

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

5. A plurality of phase coils of a motor are reused as the plurality of phase windings (140), and a plurality of phase bridge arms (130) of a motor controller are reused as the plurality of phase bridge arms (130).

5. A battery self-heating circuit according to any one of claims 1 to 4.

6. The motor includes a drive motor or an air conditioner compressor, and the motor controller includes a motor controller corresponding to the drive motor or a motor controller corresponding to the air conditioner compressor.

6. The battery self-heating circuit of claim 5.

7. The powertrain further includes a DC charging port, wherein the neutral points of the plurality of phase windings (140) are connected to a positive pole of the DC charging port, and the second bus ends of the plurality of phase bridge arms (130) are connected to a negative pole of the DC charging port, and the plurality of phase windings (140) and the plurality of phase bridge arms (130) form a boost circuit, and the boost circuit is configured to boost a direct current of the DC charging port and then charge the first battery group (110) and the second battery group (120).

7. A battery self-heating circuit according to any one of claims 1 to 6.

8. The capacitance of the first capacitor (C1) is the same as the capacitance of the second capacitor (C2); 8. A battery self-heating circuit according to any one of claims 1 to 7.

9. The capacitance of the first capacitor (C1) and the capacitance of the second capacitor (C2) are both less than 10 μF.

9. A battery self-heating circuit according to any one of claims 1 to 8.

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

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