Control method, battery system, and power supply system

Abstract

A control method, a battery system, and a power supply system. The control method comprises: upon detecting a signal from a first charging port and / or a second charging port, controlling a first switching circuit, so as to make the first charging port and / or the second charging port charge a traction battery; and controlling a second switching circuit, so as to make the traction battery perform pulse charging and discharging, thus realizing self-heating of the battery.

Description

Control method, battery system and power supply system

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 31, 2023, with application number 202311440976.6 and invention name “A control method, battery system and power supply system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electronic technology, and in particular to a control method, a battery system, and a power supply system. Background Art

[0003] With the rapid development of new energy vehicles and the increasing share of electric vehicles in the automotive market, charging efficiency has become a growing concern. To improve charging efficiency, current solutions primarily rely on high-power DC charging technology or battery swapping. However, due to the lack of widespread availability of high-voltage, high-power charging infrastructure, the charging speed of electric vehicles equipped with high-power DC charging technology is still limited by the output voltage and power of DC charging equipment.

[0004] In low-temperature environments, battery performance degrades due to the reduced activity of electrochemical substances within the battery. For high-power charging facilities, a heating device is often installed outside the battery to increase the overall battery temperature and thus improve charging performance. For example, using a positive temperature coefficient (PTC) heating film or conducting heat through a liquid medium to heat the battery results in energy loss when heat is transferred from the heat source to the battery, resulting in low heating efficiency.

[0005] Summary of the Invention

[0006] In a first aspect, an embodiment of the present application provides a control method, which includes controlling a first switching circuit to enable the first charging port and / or the second charging port to charge a power battery when a signal from the first charging port and / or the second charging port is detected; and controlling a second switching circuit to enable the power battery to perform pulse charging and discharging to enable the power battery to self-heat.

[0007] In some embodiments, controlling the first switching circuit to enable the first charging port and / or the second charging port to charge the power battery includes: turning on the first switch when the output voltage of the charging pile is lower than the charging voltage required by the power battery; turning on the first lower bridge arm switch to charge the first inductor, disconnecting the first lower bridge arm switch and turning on the first upper bridge arm switch so that the first inductor and the charging pile jointly charge the power battery, the first switching circuit includes a first switch, a first bridge arm switch and a first inductor, and the first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch.

[0008] In some embodiments, controlling the first switching circuit to enable the first charging port and / or the second charging port to charge the power battery includes: turning on the first switch when the output voltage of the charging pile is higher than the charging voltage required by the power battery; turning on the first upper bridge arm switch to enable the charging pile to charge the power battery, the first switching circuit includes a first switch and a first bridge arm switch, and the first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch.

[0009] In some embodiments, controlling the second switching circuit to cause the power battery to perform pulse charging and discharging includes: turning on the second switch; cyclically turning on the second upper bridge arm switch to charge the second inductor and turning off the second upper bridge arm switch to discharge the second inductor at a preset frequency, and turning on the second lower bridge arm switch to charge the second inductor and turning off the second lower bridge arm switch to discharge the second inductor, so that the currents between at least one half pack of the power battery oscillate with each other to perform pulse charging and discharging. The second switching circuit includes a second switch, a second inductor, and a second bridge arm switch, and the second bridge arm switch includes a second upper bridge arm switch and a second lower arm switch.

[0010] In a second aspect, an embodiment of the present application provides a battery system, which may include:

[0011] Power batteries, used for energy storage;

[0012] a first charging port, wherein a positive electrode of the first charging port is electrically connected to a positive electrode of the first switching circuit, and a negative electrode of the first charging port is electrically connected to a negative electrode of the power battery;

[0013] a second charging port, wherein a positive electrode of the second charging port is electrically connected to a positive electrode of the first switching circuit, and a negative electrode of the second charging port is electrically connected to a negative electrode of the power battery;

[0014] a first switch circuit, the first switch circuit being electrically connected to the power battery;

[0015] a second switch circuit, the second switch circuit being electrically connected to the positive electrode, the negative electrode, and the half-pack position of the power battery respectively;

[0016] a control unit, the control unit being electrically connected to the first charging port, the second charging port, the first switching circuit, and the second switching circuit respectively;

[0017] The control unit is configured to control the first switch circuit to enable the first charging port and / or the second charging port to charge the power battery when a signal from the first charging port and / or the second charging port is detected;

[0018] The control unit is further configured to control the second switch circuit to cause the power battery to perform pulse charge and discharge, so as to enable the power battery to self-heat.

[0019] In some embodiments, the first switching circuit includes a first switch, a first inductor and a first bridge arm switch, the first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series, the series connection point of the first upper bridge arm switch and the first lower bridge arm switch is the bridge arm midpoint of the first bridge arm switch, and the bridge arm midpoint of the first bridge arm switch is the first bridge arm midpoint; wherein, the first end of the first switch serves as the input end of the first switching circuit, the first end of the first switch is electrically connected to the positive pole of the first charging port, the second end of the first switch is electrically connected to the first end of the first inductor, the second end of the first inductor is electrically connected to the first bridge arm midpoint, and the two ends of the first bridge arm switch serve as the output ends of the first switching circuit.

[0020] In some embodiments, the control unit is further configured to:

[0021] When the output voltage of the charging pile is lower than the charging voltage required by the power battery, turning on the first switch;

[0022] The first lower bridge arm switch is turned on to charge the first inductor, and the first lower bridge arm switch is turned off and the first upper bridge arm switch is turned on, so that the first inductor and the charging pile charge the power battery together.

[0023] In some embodiments, the control unit is further configured to:

[0024] When the output voltage of the charging pile is higher than the charging voltage required by the power battery, turning on the first switch;

[0025] The first upper bridge arm switch is turned on so that the output voltage of the charging pile charges the power battery.

[0026] In some embodiments, the second switching circuit includes a second switch, a second inductor, and a second bridge arm switch, wherein the second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series, wherein a first end of the second inductor is electrically connected to the half-pack position of the power battery through the second switch, a second end of the second inductor is electrically connected to the midpoint of the second bridge arm, and two ends of the second bridge arm switch are electrically connected to the positive and negative electrodes of the power battery, respectively;

[0027] The series connection point of the second upper bridge arm switch and the second lower bridge arm switch is the bridge arm midpoint of the second bridge arm switch, and the bridge arm midpoint of the second bridge arm switch is the second bridge arm midpoint.

[0028] In some embodiments, the control unit is further configured to:

[0029] turning on the second switch;

[0030] The second upper bridge arm switch is cyclically turned on at a preset frequency to charge the three-phase winding of the second motor, and the second upper bridge arm switch is turned off to discharge the three-phase winding of the second motor. The second lower bridge arm switch is also turned on to charge the three-phase winding of the second motor, and the second lower bridge arm switch is turned off to discharge the three-phase winding of the second motor, so that the current between at least one half pack of the power battery oscillates with each other to perform pulse charging and discharging.

[0031] In some embodiments, the first switching circuit includes a first switch, a three-phase winding of a first motor, and a plurality of first bridge arm switches connected in parallel, wherein one first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series, and the series connection point of the first upper bridge arm switch and the first lower bridge arm switch is a bridge arm midpoint of the first bridge arm switch, and the bridge arm midpoint of the first bridge arm switch is a first bridge arm midpoint;

[0032] The first end of the first switch serves as the input end of the first switching circuit, the first end of the first switch is electrically connected to the positive pole of the first charging port, the second end of the first switch is electrically connected to the common end of the three-phase winding of the first motor, the midpoints of the multiple first bridge arms are electrically connected to one phase winding of the three-phase winding of the first motor, and the parallel connection ends of the multiple first bridge arm switches in parallel serve as the output end of the bridge arm conversion module.

[0033] In some embodiments, the control unit is further configured to:

[0034] When the output voltage of the charging pile is lower than the charging voltage required by the power battery, turning on the first switch;

[0035] First, multiple first lower bridge arm switches are turned on at the same time to charge the three-phase winding of the first motor, and then the multiple first lower bridge arm switches are turned off at the same time and multiple first upper bridge arm switches are turned on at the same time, so that the three-phase winding of the first motor and the charging pile can charge the power battery together.

[0036] In some embodiments, the control unit is further configured to:

[0037] When the output voltage of the charging pile is higher than the charging voltage required by the power battery, turning on the first switch;

[0038] A plurality of first upper bridge arm switches are turned on simultaneously so that the charging pile charges the power battery.

[0039] In some embodiments, the second switch circuit includes a second switch, a three-phase winding of a second motor, and a plurality of second bridge arm switches connected in parallel, wherein one second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series, and the series connection point of the second upper bridge arm switch and the second lower bridge arm switch is the bridge arm midpoint of the second bridge arm switch, and the bridge arm midpoint of the second bridge arm switch is the second bridge arm midpoint;

[0040] The common end of the three-phase winding of the second motor is electrically connected to the half-pack position of the power battery through the second switch, the midpoints of the multiple second bridge arms are electrically connected to one phase winding of the three-phase winding of the motor, and the parallel connection ends of the multiple parallel second bridge arm switches are electrically connected to the positive and negative poles of the power battery respectively.

[0041] In some embodiments, the control unit is further configured to:

[0042] turning on the second switch;

[0043] A plurality of second upper bridge arm switches are simultaneously turned on to charge the second inductor and a plurality of second upper bridge arm switches are simultaneously turned off to discharge the second inductor according to a preset frequency cycle, and a plurality of second lower bridge arm switches are simultaneously turned on to charge the second inductor and a plurality of second lower bridge arm switches are simultaneously turned off to discharge the second inductor, so that the current between at least one half pack of the power battery oscillates with each other to perform pulse charging and discharging.

[0044] In some embodiments, the bridge arm switch is an insulated gate bipolar transistor (IGBT).

[0045] In a third aspect, an embodiment of the present application provides a power supply system, which includes an electrical device and the battery system described in the second aspect or any one of the embodiments of the second aspect, wherein the battery system is used to implement the control method described in the first aspect or any one of the embodiments of the first aspect, and the battery system is used to provide electrical energy to the electrical device.

[0046] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the control method described in the first aspect or any one of the embodiments of the first aspect.

[0047] In a fifth aspect, an embodiment of the present application provides a chip, which includes instructions, and when the instructions are executed, the control method described in the first aspect or any one of the embodiments of the first aspect is implemented.

[0048] In a sixth aspect, an embodiment of the present application provides a vehicle, comprising the battery system described in the second aspect or any one embodiment of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0050] FIG1 is a flow chart of a control method provided by an embodiment of the present application;

[0051] FIG2 is a schematic structural diagram of a battery system provided in one embodiment of the present application;

[0052] FIG3 is a schematic structural diagram of another battery system provided in one embodiment of the present application;

[0053] FIG4 is a schematic structural diagram of another battery system provided in one embodiment of the present application;

[0054] FIG5 is a schematic structural diagram of another battery system provided in one embodiment of the present application;

[0055] 6 to 9 are schematic diagrams of current flow provided in an embodiment of the present application;

[0056] FIG10 is a schematic diagram of a vehicle provided in accordance with an embodiment of the present application.

[0057] Description of reference numerals:

[0058] 20-battery system, 200-power battery, 201-first charging port, 202-second charging port, 203-first switching circuit, 204-second switching circuit, 205-control unit. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0060] It should be noted that when a component is considered to be "electrically connected to" another component assembly, it can be directly or indirectly connected to the other component.

[0061] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this application includes any and all combinations of one or more of the relevant listed items.

[0062] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0063] The present application provides a control method, a battery system, and a power supply system.

[0064] In the embodiments of this application, both the first and second charging ports can self-heat when charging in either charging circuit or simultaneously. A second switching circuit is used to pulse charge and discharge the power battery, utilizing the internal resistance of the battery to generate heat, achieving battery self-heating. This self-heating process has a high temperature rise efficiency and can quickly raise the battery temperature, thereby improving charging performance.

[0065] Please refer to Figure 1, which is a flow chart of a control method provided by an embodiment of the present application. As shown in Figure 1, the control method may include the following steps:

[0066] S101: When a signal from the first charging port and / or the second charging port is detected, the first switch circuit is controlled to enable the first charging port and / or the second charging port to charge the power battery.

[0067] When the power battery needs to be charged, the power energy of an external power supply device (such as a charging pile) can be used to charge the power battery through the first charging port and / or the second charging port to achieve single-charger / dual-charger charging. The signal can refer to the electrical signal generated by the charging pile's charging plug being inserted into the first charging port, the physical signal generated by contact, or the CAN signal.

[0068] The execution subject in this embodiment can be a control unit, which can communicate with the external charging pile and control the first switching circuit to enable the first charging port and / or the second charging port to charge the power battery. The control unit can include two sets of independent charging control guidance circuits, which interact with the charging pile through CAN signals via the charging subnet to control the various stages of charging and the switching control of the two charging circuits. It should be noted that the external power supply can be direct current or alternating current. When it is alternating current, it can be converted to direct current through a converter before charging the power battery. This is not limited in the embodiment of the present application.

[0069] The first switching circuit includes a first switch, a first bridge arm switch and a first inductor, wherein the first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch.

[0070] In one possible implementation, when the output voltage of the charging pile is lower than the required charging voltage of the power battery, the control unit can control the first switching circuit to achieve boost charging. The charging control process can be as follows: when the control unit detects a gun signal from the first charging port and / or the second charging port, the charging process can proceed normally. Specifically, the control unit can turn on the first switch, powering up the first switching circuit; the control unit can first turn on the first lower bridge arm switch to charge the first inductor, then turn off the first lower bridge arm switch and turn on the first upper bridge arm switch, so that the first inductor and the output voltage of the charging pile jointly charge the power battery. Because the current direction does not change, the inductor voltage is superimposed on the output voltage of the external charging pile to charge the power battery, achieving boost charging.

[0071] One possible implementation method is that when the output voltage of the charging pile is higher than the charging voltage required by the power battery, the first switch is turned on and the first switch circuit is powered on; the first upper bridge arm switch is turned on so that the charging pile charges the power battery, that is, the power battery is directly charged through the first upper bridge arm switch.

[0072] The two charging circuits are independently controlled. When either circuit is in a charging interaction process, the control unit controls the charging process accordingly. This allows for independent charging of either circuit, or simultaneous charging of both circuits. This increases charging speed and meets the vehicle's high-power charging needs.

[0073] S102: Control the second switch circuit to enable the power battery to perform pulse charge and discharge, so as to cause the power battery to self-heat.

[0074] Since high-power charging requires an appropriate battery temperature, battery charging performance degrades at low temperatures, preventing the full potential of dual-charger high-power charging. Therefore, the control unit controls the first switch circuit to enable the first and / or second charging ports to charge the power battery. Simultaneously, it can control the second switch circuit to pulse charge and discharge the power battery, utilizing the internal resistance of the battery to generate heat for self-heating.

[0075] The second switching circuit may include a second switch, a second inductor, and a second bridge arm switch, wherein the second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch.

[0076] In one possible implementation, the control unit turns on the second switch, powering on the second switch circuit. The control unit cyclically turns on the second upper bridge arm switch to charge the second inductor and turns off the second upper bridge arm switch to discharge the second inductor, and turns on the second lower bridge arm switch to charge the second inductor and turns off the second lower arm switch to discharge the second inductor at a preset frequency, thereby causing the currents in at least one half pack of the power battery to oscillate with each other, thereby performing pulse charging and discharging. The at least one half pack can be understood as part or all of the power battery, and while the half pack is used for illustrative purposes only, other descriptions that can represent a portion of a power battery are also possible, and this application is not limited thereto.

[0077] The control unit may turn on the first switch and / or the second switch at the same time, that is, the power battery may be self-heated while charging the power battery.

[0078] For both the first and second charging ports, self-heating is enabled when charging in either circuit or both simultaneously. The second switching circuit pulses the power battery, generating heat from the battery's internal resistance to achieve self-heating. This self-heating process has a high temperature rise efficiency, rapidly raising the battery temperature and improving charging performance.

[0079] When the first charging port and the second charging port are charging the power battery at the same time, the advantage of dual-gun high-power charging can be brought into play. The support of self-heating and dual-gun high-power charging can significantly improve the battery charging speed at low temperatures.

[0080] Please refer to Figure 2, which is a schematic diagram of the structure of a battery system 20 provided in one embodiment of the present application. As shown in Figure 2, the battery system may include a power battery 200, a first charging port 201, a second charging port 202, a first switching circuit 203, a second switching circuit 204, and a control unit 205, wherein:

[0081] Power batteries, used for energy storage;

[0082] A first charging port 201, wherein the positive electrode of the first charging port is electrically connected to the positive electrode of the first switching circuit, and the negative electrode of the first charging port is electrically connected to the negative electrode of the power battery;

[0083] A second charging port 202, wherein the positive electrode of the second charging port is electrically connected to the positive electrode of the first switch circuit, and the negative electrode of the second charging port is electrically connected to the negative electrode of the power battery;

[0084] A first switch circuit 203, the first switch circuit is electrically connected to the power battery;

[0085] The second switch circuit 204 is electrically connected to the positive and negative electrodes of the power battery and the half-pack position of the power battery, respectively. It is understood that the half-pack position of the power battery can refer to the second switch circuit being connected to the midpoint of the power battery as shown in FIG2 , which can indicate that the power battery is divided into two half-packs. Of course, the second switch circuit can also be connected not to the midpoint of the power battery, but rather to a position above or below the midpoint, thereby dividing the power battery into two parts. In this application, only half a pack is used for illustrative purposes; other descriptions that can represent parts of a power battery are also possible and are not limited in this application.

[0086] The control unit 205 is electrically connected to the first charging port 201 , the second charging port 202 , the first switch circuit 203 , and the second switch circuit 204 , respectively.

[0087] The control unit 205 is configured to control the first switch circuit 203 to enable the first charging port 201 and / or the second charging port 202 to charge the power battery when a signal from the first charging port 201 and / or the second charging port 202 is detected;

[0088] The control unit 205 is further configured to control the second switch circuit 204 to enable the power battery to perform pulse charge and discharge, so as to enable the power battery to self-heat.

[0089] Specifically, please refer to FIG3 , which is a schematic diagram of the structure of another battery system 20 provided in one embodiment of the present application. As shown in FIG3 :

[0090] The first switch circuit 203 may include a first switch K1, a first inductor L1, and a first bridge arm switch, wherein the first bridge arm switch includes a first upper bridge arm switch VT1 and a first lower bridge arm switch VT2 connected in series, wherein the series connection point of the first upper bridge arm switch VT1 and the first lower bridge arm switch VT2 is a bridge arm midpoint of the first bridge arm switch, and the bridge arm midpoint of the first bridge arm switch is a first bridge arm midpoint;

[0091] The first end of the first switch K1 serves as the input end of the first switch circuit 203, the first end of the first switch K1 is electrically connected to the positive electrode of the first charging port 201, the second end of the first switch K1 is electrically connected to the first end of the first inductor L1, the second end of the first inductor L1 is electrically connected to the midpoint of the first bridge arm, and the two ends of the first bridge arm switch serve as the output ends of the first switch circuit 203.

[0092] Optionally, the first switch circuit 203 may further include a first capacitor C1 , which is electrically connected in parallel to the first bridge arm switch. The first capacitor C1 may be used to filter the output current of the first switch circuit 203 .

[0093] In one possible implementation, the control unit 205 can be used to: turn on the first switch K1 when the output voltage of the charging pile is lower than the charging voltage required by the power battery; first turn on the first lower bridge arm switch VT2 to charge the first inductor L1, and then turn off the first lower bridge arm switch VT2 and turn on the first upper bridge arm switch VT1, so that the voltage of the first inductor L1 and the charging pile jointly charge the power battery.

[0094] In a possible implementation, the control unit 205 may be configured to: turn on the first switch K1 when the output voltage of the charging pile is higher than the charging voltage required by the power battery; and turn on the first upper bridge arm switch VT1 to enable the charging pile to charge the power battery.

[0095] The second switch circuit 204 includes a second switch K2, a second inductor L2, and a second bridge arm switch. The second bridge arm switch includes a second upper bridge arm switch VT3 and a second lower bridge arm switch VT4 connected in series. The first end of the second inductor L2 is electrically connected to the half-pack position of the power battery through the second switch K2, the second end of the second inductor L2 is electrically connected to the midpoint of the second bridge arm, and the two ends of the second bridge arm switch are electrically connected to the positive and negative electrodes of the power battery, respectively.

[0096] The series connection point of the second upper bridge arm switch VT3 and the second lower bridge arm switch VT4 is the bridge arm midpoint of the second bridge arm switch, and the bridge arm midpoint of the second bridge arm switch is the second bridge arm midpoint.

[0097] The control unit 205 is further configured to: turn on the second switch; cyclically turn on the second upper bridge arm switch to charge the second inductor and turn off the second upper bridge arm switch to discharge the second inductor according to a preset frequency; and turn on the second lower bridge arm switch to charge the second inductor and turn off the second lower bridge arm switch to discharge the second inductor, so that the currents between at least one half pack of the power battery oscillate with each other to perform pulse charging and discharging.

[0098] The specific control method executed by the control unit can refer to the description of steps S101-102 above, which will not be repeated here.

[0099] In the embodiment of the present application, based on Figure 2, a detailed structure of a possible battery system is given, which describes in detail how the control unit controls the components in the first switching circuit and the second switching circuit to achieve self-heating in both charging modes when charging in any charging circuit or charging in both circuits at the same time. Self-heating has a high temperature rise efficiency and can quickly increase the battery temperature to improve battery charging performance, making full use of the advantages of dual-gun high-power charging. The combination of self-heating and dual-gun high-power charging power can significantly increase the battery charging speed at low temperatures.

[0100] Specifically, please refer to FIG4 , which is a schematic diagram of the structure of another battery system 20 provided in an embodiment of the present application. As shown in FIG4 :

[0101] The first switch circuit 203 includes a first switch K1, a three-phase winding of a first motor, and a plurality of first bridge arm switches connected in parallel. One first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series (as shown in FIG4 , the plurality of first upper bridge arm switches are VT1, VT3, and VT5, and the plurality of first lower bridge arm switches are VT2, VT4, and VT6). The series connection point of the first upper bridge arm switch and the first lower bridge arm switch is the bridge arm midpoint of the first bridge arm switch, and the bridge arm midpoint of the first bridge arm switch is the first bridge arm midpoint.

[0102] The first end of the first switch K1 serves as the input end of the first switching circuit 203, the first end of the first switch K1 is electrically connected to the positive pole of the first charging port 201, the second end of the first switch K1 is electrically connected to the common end of the three-phase winding of the first motor, the midpoints of the multiple first bridge arms are electrically connected to one phase winding of the three-phase winding of the first motor, and the parallel connection ends of the multiple first bridge arm switches in parallel serve as the output end of the bridge arm conversion module.

[0103] Optionally, the first switch circuit 203 may further include a first capacitor C1 , which is electrically connected in parallel to the first bridge arm switch. The first capacitor C1 may be used to filter the output current of the first switch circuit 203 .

[0104] In one possible implementation, the control unit 205 is also used to: turn on the first switch K1 when the output voltage of the charging pile is lower than the charging voltage required by the power battery; first turn on multiple first lower bridge arm switches VT2, VT4 and VT6 at the same time to charge the three-phase winding of the first motor, and then turn off the multiple first lower bridge arm switches VT2, VT4 and VT6 at the same time and turn on multiple first upper bridge arm switches VT1, VT3 and VT5 at the same time, so that the voltage of the three-phase winding of the first motor and the charging pile can jointly charge the power battery.

[0105] In one possible implementation, the control unit 205 is further used to: turn on the first switch K1 when the output voltage of the charging pile is higher than the charging voltage required by the power battery; and simultaneously turn on multiple first upper bridge arm switches VT1, VT3 and VT5 to enable the charging pile to charge the power battery.

[0106] The three-phase winding of the first motor may be equivalent to the first inductor L1 in the above embodiment.

[0107] The second switch circuit 204 includes a second switch K2, a three-phase winding of a second motor, and a plurality of second bridge arm switches connected in parallel. One second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series (as shown in FIG4 , the plurality of second upper bridge arm switches are VT7, VT9, and VT11, and the plurality of second lower bridge arm switches are VT8, VT10, and VT12). The series connection point of the second upper bridge arm switch and the second lower bridge arm switch is the bridge arm midpoint of the second bridge arm switch, and the bridge arm midpoint of the second bridge arm switch is the second bridge arm midpoint.

[0108] The common end of the three-phase winding of the second motor is electrically connected to the half-pack position of the power battery through the second switch K2, the midpoints of the multiple second bridge arms are electrically connected to one phase winding of the three-phase winding of the motor, and the parallel connection ends of the multiple second bridge arm switches in parallel are electrically connected to the positive and negative poles of the power battery respectively.

[0109] Optionally, the second switch circuit 204 may further include a second capacitor C2 , which is electrically connected in parallel with the second bridge arm switch. The second capacitor C2 may be used to filter the input current of the second switch circuit 204 .

[0110] In one possible implementation, the control unit 205 is further used to: turn on the second switch; turn on multiple second upper bridge arm switches simultaneously according to a preset frequency cycle to charge the three-phase winding of the second motor, and turn off multiple second upper bridge arm switches simultaneously to discharge the three-phase winding of the second motor, and turn on multiple second lower bridge arm switches simultaneously to charge the three-phase winding of the second motor, and turn off multiple second lower bridge arm switches simultaneously to discharge the three-phase winding of the second motor, so that the current between at least one half pack of the power battery oscillates with each other to perform pulse charging and discharging.

[0111] The three-phase winding of the second motor may be equivalent to the second inductor L2 in the above embodiment.

[0112] In the embodiment of the present application, based on Figure 2, a detailed structure of a possible battery system is given, which describes in detail how the control unit controls the components in the first switch circuit and the second switch circuit, so that when any charging circuit is charged or two circuits are charged at the same time, both charging modes can be self-heated. The self-heating temperature rise efficiency is high, and the battery temperature can be quickly increased to improve the battery charging performance, so that the advantages of dual-gun high-power charging can be brought into play. The combination of self-heating and dual-gun high-power charging power can significantly improve the battery charging speed at low temperatures. In addition, the first switch circuit and the second switch circuit can reuse the motor controller (bridge arm switch) and the motor three-phase winding (coil), which can reduce the cost of the vehicle. It is suitable for multi-motor models. For example, in a four-wheel drive model, the first switch circuit and the second switch circuit can all reuse the motor controller and the motor three-phase winding. In a two-wheel drive model, one of the first switch circuit and the second switch circuit can reuse the motor controller and the motor three-phase winding, thereby reducing the vehicle cost of the multi-motor model.

[0113] Further, please refer to FIG5 , which is a structural diagram of another battery system 20 provided in an embodiment of the present application.

[0114] As shown in Figure 5:

[0115] Based on Figure 4, the battery system may further include a third switch K3, a fourth switch K4, a fifth switch K5, a sixth switch K6, a seventh switch K7, an eighth switch K8, a ninth switch K9, a pre-charge resistor R1, and a third capacitor C3. The third capacitor C3 may be used to reduce the voltage at the charging port. Among them, the third switch K3 and the pre-charging resistor R1 are connected in series, the second switch circuit 204 is electrically connected to the positive electrode of the power battery through the third switch K3 and the pre-charging resistor R1 connected in series, the first switch circuit 203 is electrically connected to the positive electrode of the power battery through the fourth switch K4, and the second switch circuit 204 is electrically connected to the negative electrode of the power battery through the fifth switch K5. The positive and negative electrodes of the first charging port 201 are electrically connected to the input and output ends of the first switch circuit 203 respectively through the sixth switch K6 and the ninth switch K9. The third capacitor C3 is electrically connected in parallel to the input and output ends of the first switch circuit 203. The positive and negative electrodes of the second charging port 202 are electrically connected to the input and output ends of the first switch circuit 203 respectively through the seventh switch K7 and the eighth switch K8.

[0116] In dual-channel charging control:

[0117] In one possible implementation, when the output voltage of the charging pile is lower than the charging voltage required by the power battery, the control unit 205 can control the first switch circuit to implement boost charging. The charging control process can be as follows: when the control unit 205 detects the gun signal from the first charging port 201 and the second charging port 202, the charging process can be normally entered. Before starting boost charging, the first switch K1, the fourth switch K4, and the fifth switch K5 can be turned on, the sixth switch K6 and the ninth switch K9 of the first charging circuit can be turned on, and the seventh switch K7 and the eighth switch K8 of the second charging circuit can be turned on. Boost charging can be divided into two stages:

[0118] First, a plurality of first lower bridge arm switches VT2, VT4 and VT6 are turned on simultaneously to charge the three-phase winding of the first motor;

[0119] Then, the multiple first lower bridge arm switches VT2, VT4 and VT6 are disconnected at the same time and the multiple first upper bridge arm switches VT1, VT3 and VT5 are turned on at the same time, so that the voltage of the three-phase winding of the first motor and the charging pile can jointly charge the power battery.

[0120] In one possible implementation, when the output voltage of the charging pile is higher than the charging voltage required by the power battery, the control unit 205 can simultaneously turn on multiple first upper bridge arm switches VT1, VT3 and VT5 to enable the charging pile to charge the power battery.

[0121] The two charging circuits are independently controlled. When either circuit is in a charging interaction process, the control unit controls the charging process accordingly. This allows for independent charging of either circuit, or simultaneous charging of both circuits. This increases charging speed and meets the vehicle's high-power charging needs.

[0122] In battery heating control:

[0123] The control unit 205 can turn on the second switch K2, and charge the three-phase winding of the second motor by controlling VT7, VT9 and VT11 to be turned on at the same time, and discharge the three-phase winding of the second motor by controlling VT7, VT9 and VT11 to be turned off at the same time, and charge the three-phase winding of the second motor by controlling VT8, VT10 and VT12 to be turned on at the same time, and discharge the three-phase winding of the second motor by controlling VT8, VT10 and VT12 to be turned off at the same time. The timing is cyclically controlled at a certain frequency, and the corresponding current direction can be shown in Figures 6 to 9. The currents between the two half packs of the power battery oscillate with each other for pulse charging and discharging. Due to the internal resistance of the battery, it will generate heat itself, thereby realizing battery self-heating.

[0124] The bridge arm switches in the above embodiments may be metal-oxide-semiconductor field-effect transistors (MOSFETs) or insulated gate bipolar transistors (IGBTs) made of silicon semiconductor materials (Si), or third-generation wide-bandgap semiconductor materials such as silicon carbide (SiC), or gallium nitride (GaN), or diamond, or zinc oxide (ZnO), or other materials. The specific configuration may be determined based on the actual application scenario and is not limited here.

[0125] An embodiment of the present application also provides a vehicle, comprising the battery system described in any embodiment of the present application, to implement the control method described in any of the above embodiments. Please refer to Figure 10, which is a schematic diagram of a vehicle provided in one embodiment of the present application. As shown in Figure 10, the vehicle can include a battery system 20, which enables the battery to self-heat during charging without the need for external heating equipment, thereby saving costs.

[0126] The present application also provides a power supply system, comprising an electrical device and a battery system as described in any embodiment of the present application, the battery system being configured to provide electrical energy to the electrical device. The power supply system may include a data processing and logic control unit to implement the control method described in any of the above embodiments.

[0127] The present application also provides an energy storage device, which may include the battery system described in any embodiment of the present application. The energy storage device may be used for power stations, grid-side storage, such as large containerized energy storage products, industrial and commercial storage, such as cabinet-type energy storage products, household energy storage products, or other types of energy storage products, which are not limited in this application.

[0128] An embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the control method in any of the above embodiments is implemented.

[0129] An embodiment of the present application provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the control method in any of the above embodiments is implemented.

[0130] An embodiment of the present application provides a chip, which includes instructions. When the instructions are executed, the control method in any of the above embodiments is implemented.

[0131] In the description of the embodiments of the present application, it should be noted that the terms "first" and "second" are used to distinguish between identical or similar items having substantially the same functions. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or order of execution, and do not necessarily define differences. Therefore, they should not be construed as limitations on the present application.

[0132] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present application are still within the scope covered by the present application.

Claims

1. A control method, characterized in that: include: When a signal from the first charging port and / or the second charging port is detected, controlling (S101) a first switch circuit so that the first charging port and / or the second charging port charges the power battery; and The second switch circuit is controlled ( S102 ) to make the power battery perform pulse charge and discharge, so that the power battery is self-heated.

2. The control method according to claim 1, characterized in that: The controlling (S101) the first switch circuit so that the first charging port and / or the second charging port charges the power battery includes: When the output voltage of the charging pile is lower than the charging voltage required by the power battery, turning on the first switch; and The first lower bridge arm switch is turned on to charge the first inductor, the first lower bridge arm switch is turned off and the first upper bridge arm switch is turned on, so that the first inductor and the charging pile charge the power battery together, the first switch circuit includes a first switch, a first bridge arm switch and a first inductor, and the first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch.

3. The control method according to claim 1, characterized in that: The controlling (S101) the first switch circuit so that the first charging port and / or the second charging port charges the power battery includes: When the output voltage of the charging pile is higher than the charging voltage required by the power battery, turning on the first switch; and The first upper bridge arm switch is turned on so that the charging pile charges the power battery, the first switch circuit includes a first switch and a first bridge arm switch, and the first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch.

4. The control method according to any one of claims 1 to 3, characterized in that: The controlling (S102) of the second switch circuit to make the power battery perform pulse charge and discharge includes: turning on the second switch; and The second upper bridge arm switch is cyclically turned on at a preset frequency to charge the second inductor, and the second upper bridge arm switch is turned off to discharge the second inductor, and the second lower bridge arm switch is turned on to charge the second inductor, and the second lower bridge arm switch is turned off to discharge the second inductor, so that the current between at least one half pack of the power battery oscillates with each other to perform pulse charging and discharging, the second switch circuit includes a second switch, a second inductor and a second bridge arm switch, and the second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch.

5. A battery system (20), characterized in that: include: A power battery (200) for storing energy; A first charging port (201), wherein a positive electrode of the first charging port (201) is electrically connected to a positive electrode of a first switch circuit (203), and a negative electrode of the first charging port (201) is electrically connected to a negative electrode of the power battery (200); a second charging port (202), wherein a positive electrode of the second charging port (202) is electrically connected to a positive electrode of the first switch circuit (203), and a negative electrode of the second charging port (202) is electrically connected to a negative electrode of the power battery (200); The first switch circuit (203), the first switch circuit (203) is electrically connected to the power battery (200); a second switch circuit (204), the second switch circuit (204) being electrically connected to the positive electrode, the negative electrode and the half-pack position of the power battery (200) respectively; A control unit (205), wherein the control unit (205) is respectively connected to the first charging port (201) and the second charging port (202), the first switch circuit (203) and the second switch circuit (204) are electrically connected; The control unit (205) is used to control the first switch circuit (203) to enable the first charging port (201) and / or the second charging port (202) to charge the power battery (200) when detecting a signal from the first charging port (201) and / or the second charging port (202); The control unit (205) is further used to control the second switch circuit (204) to enable the power battery (200) to perform pulse charging and discharging, so as to enable the power battery (200) to self-heat.

6. The battery system (20) according to claim 5, characterized in that: The first switch circuit (203) comprises a first switch, a first inductor and a first bridge arm switch, the first bridge arm switch comprises a first upper bridge arm switch and a first lower bridge arm switch connected in series, the series connection point of the first upper bridge arm switch and the first lower bridge arm switch is the bridge arm midpoint of the first bridge arm switch, and the bridge arm midpoint of the first bridge arm switch is the first bridge arm midpoint; The first end of the first switch serves as the input end of the first switch circuit (203), the first end of the first switch is electrically connected to the positive electrode of the first charging port (201), the second end of the first switch is electrically connected to the first end of the first inductor, the second end of the first inductor is electrically connected to the midpoint of the first bridge arm, and the two ends of the first bridge arm switch serve as the output ends of the first switch circuit (203).

7. The battery system (20) according to claim 5 or 6, characterized in that: The control unit (205) is also used for: When the output voltage of the charging pile is lower than the charging voltage required by the power battery (200), turning on the first switch; The first lower bridge arm switch is turned on to charge the first inductor, and the first lower bridge arm switch is turned off and the first upper bridge arm switch is turned on, so that the first inductor and the charging pile charge the power battery (200) together.

8. The battery system (20) according to claim 5 or 6, characterized in that: The control unit (205) is also used for: When the output voltage of the charging pile is higher than the charging voltage required by the power battery (200), turning on the first switch; The first upper bridge arm switch is turned on so that the charging pile charges the power battery (200).

9. The battery system (20) according to claim 5, characterized in that: The second switch circuit (204) comprises a second switch, a second inductor and a second bridge arm switch, the second bridge arm switch comprising a second upper bridge arm switch and a second lower bridge arm switch connected in series, wherein the first end of the second inductor is electrically connected to the half-pack position of the power battery (200) through the second switch, the second end of the second inductor is electrically connected to the midpoint of the second bridge arm, and the two ends of the second bridge arm switch are electrically connected to the positive electrode and the negative electrode of the power battery (200) respectively; The series connection point of the second upper bridge arm switch and the second lower bridge arm switch is the bridge arm midpoint of the second bridge arm switch, and the bridge arm midpoint of the second bridge arm switch is the second bridge arm midpoint.

10. The battery system (20) according to claim 9, characterized in that: The control unit (205) is also used for: turning on the second switch; The second upper bridge arm switch is cyclically turned on at a preset frequency to charge the second inductor, and the second upper bridge arm switch is turned off to discharge the second inductor, and the second lower bridge arm switch is turned on to charge the second inductor, and the second lower bridge arm switch is turned off to discharge the second inductor, so that the currents between at least one half pack of the power battery (200) oscillate with each other to perform pulse charging and discharging.

11. The battery system (20) according to claim 5, characterized in that: The first switch circuit (203) comprises a first switch, a three-phase winding of a first motor and a plurality of first bridge arm switches connected in parallel, wherein one first bridge arm switch comprises a first upper bridge arm switch and a first lower bridge arm switch connected in series, the series connection point of the first upper bridge arm switch and the first lower bridge arm switch is the bridge arm midpoint of the first bridge arm switch, and the bridge arm midpoint of the first bridge arm switch is the first bridge arm midpoint; The first end of the first switch serves as the input end of the first switch circuit (203), the first end of the first switch is electrically connected to the positive pole of the first charging port (201), the second end of the first switch is electrically connected to the common end of the three-phase winding of the first motor, the midpoints of the multiple first bridge arms are electrically connected to one phase winding of the three-phase winding of the first motor, and the parallel connection ends of the multiple first bridge arm switches in parallel serve as the output end of the bridge arm conversion module.

12. The battery system (20) according to claim 11, characterized in that: The control unit (205) is also used for: When the output voltage of the charging pile is lower than the charging voltage required by the power battery (200), turning on the first switch; First, a plurality of first lower bridge arm switches are turned on simultaneously to charge the three-phase winding of the first motor, and then the plurality of first lower bridge arm switches are turned off simultaneously and a plurality of first upper bridge arm switches are turned on simultaneously, so that the three-phase winding of the first motor and the charging pile can charge the power battery (200) together.

13. The battery system (20) according to claim 11, characterized in that: The control unit (205) is also used for: When the output voltage of the charging pile is higher than the charging voltage required by the power battery (200), turning on the first switch; A plurality of first upper bridge arm switches are turned on simultaneously, so that the charging pile charges the power battery (200).

14. The battery system (20) according to claim 5, characterized in that: The second switch circuit (204) comprises a second switch, a three-phase winding of a second motor and a plurality of second bridge arm switches connected in parallel, wherein one second bridge arm switch comprises a second upper bridge arm switch and a second lower bridge arm switch connected in series, the series connection point of the second upper bridge arm switch and the second lower bridge arm switch is the bridge arm midpoint of the second bridge arm switch, and the bridge arm midpoint of the second bridge arm switch is the second bridge arm midpoint; The common end of the three-phase winding of the second motor is electrically connected to the half-pack position of the power battery through the second switch, the midpoints of the plurality of second bridge arms are electrically connected to one phase winding of the three-phase winding of the motor, and the parallel connection ends of the plurality of second bridge arm switches in parallel are electrically connected to the positive electrode and the negative electrode of the power battery (200), respectively.

15. The battery system (20) according to claim 14, characterized in that: The control unit (205) is also used for: turning on the second switch; A plurality of second upper bridge arm switches are turned on simultaneously according to a preset frequency cycle to charge the three-phase winding of the second motor, and a plurality of second upper bridge arm switches are turned off simultaneously to discharge the three-phase winding of the second motor, and a plurality of second lower bridge arm switches are turned on simultaneously to charge the three-phase winding of the second motor, and a plurality of second lower bridge arm switches are turned off simultaneously to discharge the three-phase winding of the second motor, so that the currents between at least one half pack of the power battery (200) oscillate with each other to perform pulse charging and discharging.

16. The battery system (20) according to any one of claims 6 to 15, characterized in that: The bridge arm switches are insulated gate bipolar transistors (IGBTs).

17. A power supply system, characterized in that: It comprises an electric device and a battery system (20) as claimed in claims 5 to 16, wherein the battery system (20) is used to provide electric energy to the electric device.

18. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes instructions, and when the instructions are executed by a processor, the control method according to any one of claims 1 to 4 is executed.

19. A chip, characterized in that: The chip includes instructions, and when the instructions are executed, the control method according to any one of claims 1 to 4 is executed.

20. A vehicle, characterized in that: Comprising a battery system (20) as claimed in claims 5-16.

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