Battery circuit, control method for battery circuit, and vehicle

Abstract

A battery circuit, a control method for the battery circuit, and a vehicle. The battery circuit includes a power supply end, a first battery pack, a second battery pack of a different type from the first battery pack, a transformer unit, a first switch, a second switch, and a ground end, in which a positive electrode of the first battery pack is connected to the power supply end, a negative electrode of the first battery pack is connected to a positive electrode of the second battery pack, a negative electrode of the second battery pack is connected to the ground end, a first end of the first switch is connected to the power supply end, a second end of the first switch is connected to the first end of the second switch, and a second end of the second switch is connected to the ground end, and the transformer unit is connected between the negative electrode of the first battery pack and the second end of the first switch.

Description

Technical Field

[0001] Cross - reference to Related Applications This disclosure claims the priority and benefit of Chinese Patent Application No. 202210611795.4, entitled "Battery Circuit and Vehicle", filed on May 31, 2022, and Chinese Patent Application No. 202211056937.1, entitled "Power Supply Circuit, Power Supply Control Method, Storage Medium and Vehicle", filed on August 31, 2022. The entire contents of the above applications are incorporated herein by reference.

[0002] Technical Field This disclosure relates to the field of vehicle technology, and more specifically, to a battery circuit, a control method for the battery circuit, and a vehicle.

Background Art

[0003] In the prior art, a double - battery pack including a power - type battery pack and an energy - type battery pack has been proposed.

[0004] However, how to provide a hardware basis for controlling a dual - battery pack including a power - type battery pack and an energy - type battery pack has become an urgent technical problem to be solved.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The objective of this disclosure is to provide a new technical solution for a battery circuit.

Means for Solving the Problems

[0006] According to a first aspect of this disclosure, a battery circuit is provided. The battery circuit includes a power supply end, a first battery pack, a second battery pack of a different type from the first battery pack, a transformer unit, a first switch, a second switch, and a ground end.

[0007] The positive terminal of the first battery pack is connected to the power supply terminal, and the negative terminal of the first battery pack is connected to the positive terminal of the second battery pack.

[0008] The negative terminal of the second battery pack is connected to the ground terminal.

[0009] The first end of the first switch is connected to the power supply end, and the second end of the first switch is connected to the first end of the second switch.

[0010] The second end of the second switch is connected to the ground end.

[0011] The transformer unit is connected between the negative terminal of the first battery pack and the second end of the first switch.

[0012] According to one embodiment of the present disclosure, the battery circuit is The system further includes a control unit, the first end of which is connected to the control end of a first switch, and the second end of which is connected to the control end of a second switch. The control unit is configured to open and close the first switch and the second switch in accordance with a first preset control rule in order to increase the output power of the second battery pack under first preset conditions, and / or In a second set of conditions, the system is configured to control the opening and closing of the first and second switches according to a second set of control rules in order to make the input power of the first battery pack different from the input power of the second battery pack, and / or Under a third set of conditions, the system is configured to control the opening and closing of the first and second switches in accordance with a third set of control rules in order to cause the first battery pack to charge the second battery pack, or the second battery pack to charge the first battery pack, and / or Under a fourth set condition, the system is configured to control the opening of the first and second switches so that the first and second battery packs are connected in series for discharge or charge.

[0013] According to one embodiment of the present disclosure, the first battery pack is a power-type battery pack, the second battery pack is an energy-type battery pack, or The first battery pack is an energy-type battery pack, and the second battery pack is a power-type battery pack.

[0014] According to one embodiment of the present disclosure, the first battery pack is a power-type battery pack, the second battery pack is an energy-type battery pack, and the battery circuit further includes a filtering unit. The first end of the filtering unit is connected to the positive terminal of the first battery pack, the second end of the filtering unit is connected to the power terminal, and the third end of the filtering unit is connected to the negative terminal of the first battery pack.

[0015] According to one embodiment of the present disclosure, the filtering unit includes a first inductor and a first capacitor, The first end of the first inductor is connected to the positive terminal of the first battery pack, the second end of the first inductor is connected to the power supply terminal, and The first end of the first capacitor is connected to the first end of the first inductor, and the second end of the first capacitor is connected to the negative terminal of the first battery pack.

[0016] According to one embodiment of the present disclosure, the battery circuit further includes a first recirculation unit and a second recirculation unit, The input terminal of the first recirculation unit is connected to the second terminal of the first switch, and the output terminal of the first recirculation unit is connected to the first terminal of the first switch, The input end of the second reflux unit is connected to the second end of the second switch, and the output end of the second reflux unit is connected to the first end of the second switch.

[0017] According to an embodiment of the present disclosure, the first reflux unit is a first diode, the second reflux unit is a second diode, the anode of the first diode is connected to the second end of the first switch, the cathode of the first diode is connected to the first end of the first switch, and the anode of the second diode is connected to the second end of the second switch, the cathode of the second diode is connected to the first end of the second switch.

[0018] According to an embodiment of the present disclosure, the battery circuit further includes a voltage stabilization unit, the voltage stabilization unit is connected between the power supply end and the ground end.

[0019] According to an embodiment of the present disclosure, the voltage stabilization unit is a second capacitor.

[0020] According to an embodiment of the present disclosure, the transformer unit is a second inductor.

[0021] According to an embodiment of the present disclosure, the transformer unit is a second inductor, the first switch and the second switch form a first bridge arm, the battery circuit further includes a second bridge arm and a third inductor, the first bridge arm and the second bridge arm form a full-bridge circuit, the second bridge arm is connected in parallel with the first bridge arm and is bridged between the positive electrode of the first battery pack and the negative electrode of the second battery pack, one end of the third inductor is connected to the midpoint of the second bridge arm, the other end of the third inductor is connected to the negative electrode of the first battery pack and the positive electrode of the second battery pack respectively, and The control unit is connected to the second bridge arm, and the control unit is further configured to control the full-bridge circuit to supply power to the first battery pack and / or the second battery pack.

[0022] According to an embodiment of the present disclosure, the control unit controls the full-bridge circuit to a non-operating state to connect the first battery pack and the second battery pack in series to supply power, or controls the full-bridge circuit to an operating state to supply power to the first battery pack and / or the second battery pack, and is further configured as such.

[0023] According to an embodiment of the present disclosure, the battery circuit further includes a current sampling unit configured to acquire the current of the first battery pack and / or the current of the second battery pack, the current of the second inductor, and the current of the third inductor, and the control unit controls the full-bridge circuit based on the acquired current to supply power to the first battery pack and / or the second battery pack.

[0024] According to an embodiment of the present disclosure, the control unit is configured to generate a first control signal and a second control signal complementary to the first control signal according to a first current difference between a preset reference current and the current of the first battery pack or the current of the second battery pack, a first signal generation sub-unit, is configured to generate a third control signal and a fourth control signal complementary to the third control signal according to a second current difference between the current of the second inductor and the current of the third inductor, a second signal generation sub-unit, and a control sub-unit configured to control the full-bridge circuit based on the first control signal, the second control signal, the third control signal, and the fourth control signal and includes.

[0025] According to one embodiment of the present disclosure, the first signal generation subunit includes a first subtractor, a first regulator, a first signal generator, and a first inverter. The first subtractor is configured to obtain a first current difference between a preset reference current and the current of the first battery pack or the current of the second battery pack. The first regulator is configured to perform proportional-integral adjustment on the first current difference to obtain a first given value. The first signal generator is configured to generate a first control signal according to a first given value and a first preset signal, and The first inverter is configured to invert the first control signal to obtain the second control signal, and The second signal generation subunit includes a second subtractor, a second regulator, a second signal generator, and a second inverter. The second subtractor is configured to obtain a second current difference between the current of the second inductor and the current of the third inductor. The second regulator is configured to perform proportional-integral adjustment on the second current difference to obtain a second given value. The second signal generator is configured to generate a third control signal according to a second given value and a second preset signal, and The second inverter is configured to invert the third control signal to obtain the fourth control signal. The first preset signal and the second preset signal are out of phase by half a period.

[0026] According to one embodiment of the present disclosure, the current sampling unit acquires the current of the second battery pack when the first battery pack is discharged, and the current sampling unit acquires the current of the first battery pack when the second battery pack is discharged.

[0027] According to one embodiment of the present disclosure, the second end of the first switch and the first end of the second switch form a first connection point, and The second bridge arm includes a third switch and a fourth switch, the first end of the third switch being connected to the positive terminal of the first battery pack, the second end of the third switch being connected to the first end of the fourth switch forming a second connection point, the second end of the fourth switch being connected to the negative terminal of the second battery pack, and the second connection point being connected to one end of the third inductor.

[0028] According to one embodiment of the present disclosure, the battery circuit further includes a third recirculation unit and a fourth recirculation unit, The input terminal of the third recirculation unit is connected to the second terminal of the third switch, and the output terminal of the third recirculation unit is connected to the first terminal of the third switch, The input terminal of the fourth recirculation unit is connected to the second terminal of the fourth switch, and the output terminal of the fourth recirculation unit is connected to the first terminal of the fourth switch.

[0029] According to one embodiment of the present disclosure, the control subunit is The first switch of the first bridge arm is controlled according to the first control signal, the second switch of the first bridge arm is controlled according to the second control signal, the third switch is controlled according to the third control signal, and the fourth switch is controlled according to the fourth control signal. It is further configured in this way.

[0030] According to one embodiment of the present disclosure, the control subunit is configured to control a third switch according to a first control signal and a fourth switch according to a second control signal when a first bridge arm fails.

[0031] According to a second aspect of this disclosure, a control method for a battery circuit is provided, the method is: The steps include obtaining the current of the first battery pack and / or the current of the second battery pack, the current of the second inductor, and the current of the third inductor, The steps include controlling a full-bridge circuit based on the acquired current to supply power to the first battery pack and / or the second battery pack, Includes.

[0032] According to one embodiment of the present disclosure, the step of controlling a full-bridge circuit based on the acquired current to supply power to a first battery pack and / or a second battery pack is: The steps include: obtaining a first current difference between a preset reference current and the current of a first battery pack or a second battery pack, and generating a first control signal and a second control signal complementary to the first control signal according to the first current difference; The steps include obtaining a second current difference between the current of a second inductor and the current of a third inductor, and generating a third control signal and a fourth control signal complementary to the third control signal according to the second current difference, The steps include controlling a full-bridge circuit according to a first control signal, a second control signal, a third control signal, and a fourth control signal, Includes.

[0033] According to one embodiment of the present disclosure, the step of generating a first control signal and a second control signal complementary to the first control signal according to a first current difference is: The steps include: obtaining a first given value by performing proportional-integral adjustment on a first current difference; generating a first control signal according to the first given value and a first preset signal; and obtaining a second control signal by inverting the first control signal. A step of obtaining a second given value by performing proportional-integral adjustment on a second current difference, generating a third control signal according to the second given value and a second preset signal, and obtaining a fourth control signal by inverting the third control signal, wherein the first preset signal and the second preset signal are out of phase by half a period. Includes.

[0034] According to one embodiment of the present disclosure, the step of controlling a full-bridge circuit according to a first control signal, a second control signal, a third control signal, and a fourth control signal is: The steps include controlling a first switch of a first bridge arm according to a first control signal and controlling a second switch of a first bridge arm according to a second control signal, Steps include: controlling the third switch of the second bridge arm according to the third control signal and the fourth switch of the second bridge arm according to the fourth control signal when the first bridge arm is operating normally; and controlling the third switch of the second bridge arm according to the first control signal and the fourth switch of the second bridge arm according to the second control signal when the first bridge arm fails. Includes.

[0035] A third aspect of this disclosure further provides a vehicle including a battery circuit relating to any one of the first aspects.

[0036] A battery circuit provided in one embodiment of the present disclosure may be implemented to provide a hardware base for controlling a dual battery pack, including a first battery pack and a second battery pack.

[0037] Other features and advantages of this disclosure will become more apparent from the detailed description of typical embodiments of this disclosure made in connection with the accompanying drawings.

[0038] The accompanying drawings, incorporated in this specification and constituting a part of this specification, illustrate embodiments of the present disclosure and are used together with this specification to illustrate the principles of the present disclosure. [Brief explanation of the drawing]

[0039] [Figure 1]This is a first schematic diagram of a battery circuit according to one embodiment of the present disclosure. [Figure 2] This is a second schematic diagram of a battery circuit according to one embodiment of the present disclosure. [Figure 3] This is a third schematic diagram of a battery circuit according to one embodiment of the present disclosure. [Figure 4] This is a fourth schematic diagram of a battery circuit according to one embodiment of the present disclosure. [Figure 5] This is a fifth schematic diagram of a battery circuit according to one embodiment of the present disclosure. [Figure 6] This is a sixth schematic diagram of a battery circuit according to one embodiment of the present disclosure. [Figure 7] This is a schematic diagram of a control unit according to one embodiment of the present disclosure. [Figure 8] This is a schematic diagram of a process in which a control unit generates a control signal according to one embodiment of the present disclosure. [Figure 9] This is a seventh schematic diagram of a battery circuit according to one embodiment of the present disclosure. [Figure 10] This is a schematic flowchart of a control method for a battery circuit according to one embodiment of the present disclosure. [Figure 11] This is a schematic diagram of a vehicle according to one embodiment of the present disclosure. [Explanation of Symbols]

[0040] 100 Battery Circuit 101 Power supply end 102 First Battery Pack 103 Second battery pack 104 Transformer Unit 1041 Second Inductor 105 First switch 106 The second switch 107 Ground end 108 Control Unit 1081 First signal generation subunit 1082 Second signal generation subunit 1083 Control Subunit 109 Filtering Unit 1091 First Inductor 1092 First Capacitor 110 First recirculation unit 1101 First diode 111 Second Circulation Unit 1111 Second diode 112 Voltage Stabilization Unit 1121 Second Capacitor 113 The third switch 114 The fourth switch 115 Third Inductor 116 Current Sampling Unit 117 Third Circulation Unit 118. Fourth Circulation Unit A1 First subtractor B1 First Regulator P1 First signal generator N1 First Inverter A2 Second subtractor B2 Second regulator P2 Second signal generator N2 Second Inverter [Modes for carrying out the invention]

[0041] The embodiments of this disclosure will be described in detail below with reference to the drawings. Unless otherwise specified, the components, steps, formulas, and numerical values ​​described in each embodiment are not intended to limit the scope of this disclosure to those components alone.

[0042] The following description of at least one exemplary embodiment is merely illustrative and is not in any way intended to serve as a limitation on the Disclosure or any use or application thereof.

[0043] Techniques, methods, and devices known to those skilled in the art may not be described in detail, but where appropriate, such techniques, methods, and devices should be considered part of this specification.

[0044] In all examples shown and described herein, any particular values ​​should be interpreted as examples only and not as limitations. Therefore, other examples of the exemplary embodiments may have different values.

[0045] It should be noted that in the following attached drawings, similar numbers and letters represent the same items. Therefore, once an item is defined in one of the attached drawings, it does not need to be further explained in subsequent attached drawings.

[0046] Embodiments of the present disclosure provide a battery circuit 100. As shown in Figure 1, the battery circuit 100 includes a power terminal 101, a first battery pack 102, a second battery pack 103 of a different type from the first battery pack 102, a transformer unit 104, a first switch 105, a second switch 106, and a ground terminal 107.

[0047] The positive terminal of the first battery pack 102 is connected to the power terminal 101, and the negative terminal of the first battery pack 102 is connected to the positive terminal of the second battery pack 103.

[0048] The negative terminal of the second battery pack 103 is connected to the ground terminal 107.

[0049] The first end of the first switch 105 is connected to the power supply end 101, and the second end of the first switch 105 is connected to the first end of the second switch 106.

[0050] The second end of the second switch 106 is connected to the ground end 107.

[0051] The transformer unit 104 is connected between the negative terminal of the first battery pack 102 and the second end of the first switch 105.

[0052] Embodiments of the present disclosure provide a battery circuit comprising a power terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a transformer unit, a first switch, a second switch, and a ground terminal, wherein the positive terminal of the first battery pack is connected to the power terminal, the negative terminal of the first battery pack is connected to the positive terminal of the second battery pack, the negative terminal of the second battery pack is connected to the ground terminal, the first end of the first switch is connected to the power terminal, the second end of the first switch is connected to the first end of the second switch, the second end of the second switch is connected to the ground terminal, and the transformer unit is connected between the negative terminal of the first battery pack and the second end of the first switch. In this way, the battery circuit provided in embodiments of the present disclosure can be implemented as providing a hardware base for controlling a dual battery pack including the first and second battery packs.

[0053] In embodiments of this disclosure, when the battery circuit 100 is in a discharged state, the power terminal 101 in the battery circuit 100 is configured to be connected to the power input terminal of the load, and the ground terminal 107 in the battery circuit 100 is configured to be connected to the ground terminal of the load. The load may be, for example, the motor of an electric vehicle or a hybrid vehicle.

[0054] Alternatively, when the battery circuit 100 is in a charging state, the power terminal 101 in the battery circuit 100 is configured to connect to the power output terminal of a charging device, and the ground terminal 107 in the battery circuit 100 is configured to connect to the ground terminal of a charging device. The charging device may be, for example, a charging pile or a braking system for an electric or hybrid vehicle.

[0055] In one embodiment of this disclosure, as shown in Figure 4, the transformer unit 104 may be a second inductor 1041. Indeed, the transformer unit 104 may be implemented in other ways.

[0056] In one embodiment of this disclosure, the inductance value of the second inductor 1041 may be set in the range of 2 μH to 1500 μH.

[0057] In the embodiments of this disclosure, when the transformer unit 104 is a second inductor 1041, the transformer unit 104 has a low-cost and simple structure.

[0058] In one embodiment of this disclosure, the first switch 105 and the second switch 106 may each be a switch IC, a metal oxide semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), a silicon carbide (SiC) switch, and the like.

[0059] It may be understood that the first switch 105 further includes a control end to realize control of the opening and closing of the first switch 105. Similarly, the second switch 106 further includes a control end to control the opening and closing of the second switch 106.

[0060] In the embodiments of this disclosure, the type of the first battery pack 102 and the type of the second battery pack 103 are different. Specifically, the first battery pack 102 is a power-type battery pack, and the second battery pack 103 is an energy-type battery pack. Alternatively, the first battery pack 102 is an energy-type battery pack, and the second battery pack 103 is a power-type battery pack.

[0061] In embodiments of this disclosure, the power battery pack is identified as a high power density battery pack. Power density is defined as the maximum power of energy transfer by the battery per unit weight or unit volume during charging or discharging. In embodiments of this disclosure, the voltage value of the power battery pack may be set in the range of 100V to 1000V.

[0062] An energy-type battery pack is a battery pack with high energy density. Energy density is specified as the energy stored by the battery per unit weight or unit volume. In embodiments of this disclosure, the voltage value of the energy-type battery pack may be set in the range of 100V to 1000V.

[0063] In embodiments of this disclosure, the specific types of the first battery pack 102 and the second battery pack 103 are not limited, which can improve the compatibility of the battery circuit 100 provided in embodiments of this disclosure.

[0064] The battery circuit 100 shown in Figure 1, provided in the embodiments of this disclosure, provides a hardware base for controlling a dual battery pack including a power battery pack and an energy battery pack. Specifically, based on the battery circuit shown in Figure 1, a dual battery pack consisting of a power battery pack and an energy battery pack can be controlled according to the following:

[0065] To control the first switch 105 and the second switch 106, the battery circuit 100 further includes a control unit 108, as shown in Figure 2.

[0066] The first end of the control unit 108 is connected to the control end of the first switch 105, and the second end of the control unit 108 is connected to the control end of the second switch 106.

[0067] In one embodiment of this disclosure, the control unit 108 may be, for example, a CPU, an MCU, or the like.

[0068] In addition, the control unit 108 is configured to increase the output power of the second battery pack 103 by controlling the opening and closing of the first switch 105 and the second switch 106 in accordance with the first preset control rules under the first preset conditions.

[0069] In this embodiment, the first preset condition may be that the battery circuit 100 is in a discharged state. The first preset control rule may be to perform a first on / off operation, wherein the first on / off operation is to control the first switch 105 to open and the second switch 106 to close within a first period, and to control the first switch 105 to close and the second switch 106 to open within a second period, and the first on / off operation may be repeated until the first battery pack 102 is released.

[0070] In this embodiment, the second period is adjacent to the first period and located after the first period. The durations corresponding to the first period and the durations corresponding to the second period may be determined empirically or by other means.

[0071] In this embodiment, when the battery circuit 100 is in a discharge state, during the first period, the first switch 105 is controlled to open and the second switch 106 is controlled to close. In this case, the second battery pack 103 charges the transformer unit 104. During the second period, the first switch 105 is controlled to close and the second switch 106 is controlled to open. In this case, the transformer unit 104 discharges the stored electrical energy. That is, the voltage at the output terminal of the transformer unit 104 (the terminal connected to the first switch 105) rises, and by repeating this process, the voltage at the output terminal of the transformer unit 104 rises to become equal to the bus voltage. In this case, the first battery pack 102 is opened. As a result, only the second battery pack 103 discharges, and it is possible to achieve a situation where the power output by the second battery pack 103 is higher than the power that the second battery pack 103 can output. In other words, the output power of the second battery pack 103 increases.

[0072] In addition, the control unit 108 is further configured to open and close the first switch 105 and the second switch 106 according to a second preset control rule under a second preset condition, so that the input power of the first battery pack 102 is different from the input power of the second battery pack 103.

[0073] In this embodiment, the second preset condition may be that the battery circuit 100 is in a charged state. The second preset control rule may be to perform a second on / off operation, where the second on / off operation controls the first switch 105 to close and the second switch 106 to open within a third period, and controls the first switch 105 to open and the second switch 106 to close within a fourth period, and to perform the second on / off operation repeatedly.

[0074] In this embodiment, the third period is adjacent to the fourth period and located after the third period. The durations corresponding to the third period and the fourth period may be determined empirically or by other means.

[0075] In this embodiment, when the battery circuit 100 is in a charging state, during the third period, the first switch 105 is controlled to close and the second switch 106 is controlled to open. In this case, the first battery pack 102 and / or the charging device charge the transformer unit 104. During the fourth period, the first switch 105 is controlled to open and the second switch 106 is controlled to close. In this case, the transformer unit 104 discharges its stored electrical energy to charge the second battery pack 103 together with the charging device. That is, the transformer unit 104 realizes a boost function. Since the first battery pack 102 is charged only by the charging device, and the second battery pack 103 is charged together with the transformer unit 104 and the same charging device, by repeating this process, the input power of the second battery pack 103 may become higher than the input power of the first battery pack 102. In other words, the input power of the second battery pack 103 is different from the input power of the first battery pack 102.

[0076] If the second preset control rule is the opposite of the repetition of the second on / off operation described above, that is, if the first switch 105 is controlled to open and the second switch 106 is controlled to close within a third period, and the first switch 105 is controlled to close and the second switch 106 is controlled to open within a fourth period, then it can be understood that by repeating this operation, the input power of the first battery pack 102 can be made greater than the input power of the second battery pack 103. In other words, the input power of the second battery pack 103 is different from the input power of the first battery pack 102.

[0077] In addition, the control unit 108 is further configured to open and close the first switch 105 and the second switch 106 in accordance with a third preset control rule under a third preset condition, causing the first battery pack 102 to charge the second battery pack 103, or the second battery pack 103 to charge the first battery pack 102.

[0078] In this embodiment, the third preset condition may be that the charging current of the second battery pack 103 is less than the maximum charging current of the second battery pack 103. Correspondingly, the third preset control rule is to perform a third on / off operation, wherein the third on / off operation controls the first switch 105 to close and the second switch 106 to open within a fifth period, and controls the first switch 105 to open and the second switch 106 to close within a sixth period, and repeats the third on / off operation.

[0079] In this embodiment, the fifth period is a period adjacent to the sixth period and located after the fifth period. The durations corresponding to the fifth period and the sixth period may be determined empirically or by other means.

[0080] In this embodiment, if the charging current of the second battery pack 103 is less than the maximum charging current of the second battery pack 103, during the fifth period, the first switch 105 is controlled to close and the second switch 106 is controlled to open. In this case, the first battery pack 102 charges the transformer unit 104. During the sixth period, the first switch 105 is controlled to open and the second switch 106 is controlled to close. In this case, the transformer unit 104 discharges the stored electrical energy to the second battery pack 103. That is, the transformer unit 104 realizes a voltage boosting function. By repeating this process, the first battery pack 102 may charge the second battery pack 103.

[0081] If the third preset condition is that the charging current of the first battery pack 102 is less than the maximum charging current of the first battery pack 102, then the third preset control rule is the opposite of the third on / off operation repetition, that is, the first switch 105 is controlled to open and the second switch 106 is controlled to close within the fifth period, and within the sixth period, the first switch 105 is controlled to close and the second switch 106 is controlled to open, and by repeating this operation, it can be understood that the second battery pack 103 can charge the first battery pack 102.

[0082] In addition, the control unit 108 is further configured to control the opening of the first switch 105 and the second switch 106 under a fourth preset condition, thereby connecting the first battery pack 102 and the second battery pack 103 in series for discharge or charge.

[0083] In this embodiment, a fourth preset condition is that the battery circuit 100 is in a discharge or charge state. Under the fourth preset condition, the first switch 105 and the second switch 106 are controlled to open. In this way, the first battery pack 102 and the second battery pack 103 work together to discharge or charge.

[0084] Based on the above, embodiments of this disclosure provide various controls for the battery circuit shown in Figure 1.

[0085] Embodiments of the present disclosure provide a battery circuit comprising a power terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a transformer unit, a first switch, a second switch, and a ground terminal, wherein the positive terminal of the first battery pack is connected to the power terminal, the negative terminal of the first battery pack is connected to the positive terminal of the second battery pack, the negative terminal of the second battery pack is connected to the ground terminal, the first end of the first switch is connected to the power terminal, the second end of the first switch is connected to the first end of the second switch, the second end of the second switch is connected to the ground terminal, and the transformer unit is connected between the negative terminal of the first battery pack and the second end of the first switch. In this way, the battery circuit provided in embodiments of the present disclosure can be implemented as providing a hardware base for controlling a dual battery pack including the first and second battery packs.

[0086] In embodiments of the present disclosure, when the first battery pack 102 is a power-type battery pack and the second battery pack 103 is an energy-type battery pack, the battery circuit 100 provided in embodiments of the present disclosure further comprises a filtering unit 109, as shown in Figure 3. The first end of the filtering unit 109 is connected to the positive terminal of the first battery pack 102, the second end of the filtering unit 109 is connected to the power terminal 101, and the third end of the filtering unit 109 is connected to the negative terminal of the first battery pack 102.

[0087] In embodiments of this disclosure, the power battery pack is generally used when peak power (for example, peak discharge power generated during the towing process or peak charge power generated during the braking process) is generated during the operation of an electric vehicle or hybrid vehicle, and does not need to be used in other cases. Therefore, in other cases, the output current value of the power battery pack is expected to be 0. In this case, the filtering unit 109 may be configured to suppress the current ripple of the first battery pack 102 and prevent the output current of the power battery pack used as the first battery pack 102 from fluctuating near 0. This makes it possible to avoid the first battery pack 102 from being rapidly charged and discharged at high frequency, and reduces the problem of a shortened lifespan of the first battery pack 102.

[0088] In one embodiment of the present disclosure, as shown in Figure 4, the filtering unit 109 includes a first inductor 1091 and a first capacitor 1092. The first end of the first inductor 1091 is connected to the positive terminal of the first battery pack 102, the second end of the first inductor 1091 is connected to the power supply terminal, and The first end of the first capacitor 1092 is connected to the first end of the first inductor 1091, and the second end of the first capacitor 1092 is connected to the negative terminal of the first battery pack 102.

[0089] Certainly, other structures of the filtering unit 109 can also be used. These are not described in detail in the embodiments of this disclosure.

[0090] In embodiments of this disclosure, the first inductor 1091 is a filter inductor, and the value of the first inductor 1091 may be set in the range of 2 μH to 1500 μH. Specifically, the first inductor 1091 is configured to improve power quality by filtering high-frequency components of the power supply current.

[0091] The first capacitor 1092 is a filter capacitor, and its value may be set in the range of 2μF to 1500μF. Specifically, the first capacitor 1092 is configured to filter the output voltage of the first battery pack 102 to stabilize the output voltage of the first battery pack 102, suppress the current ripple of the first battery pack 102, and prevent the output current of the first battery pack 102 from fluctuating near zero. This prevents the first battery pack 102 from rapidly charging and discharging at high frequencies, avoiding the problem of a shortened lifespan of the first battery pack 102, and achieving the objective of extending the lifespan of the battery pack.

[0092] Furthermore, if the first battery pack 102 has a filtering function, the first inductor 1091 and the first capacitor 1092 may be set to relatively small values. For example, the first inductor 1091 may be set to 2 μH and the first capacitor 1092 may be set to 2 μF.

[0093] In response to this, if the first battery pack 102 does not have a filtering function, the first inductor 1091 and the first capacitor 1092 may be set to relatively large values. For example, the first inductor 1091 may be set to 1500 μH and the first capacitor 1092 may be set to 1500 μF.

[0094] In embodiments of this disclosure, a filtering unit 109 with a simple structure is provided, which can reduce hardware cost, design complexity, and the substrate footprint of the battery circuit 100.

[0095] In one embodiment of the present disclosure, as shown in Figure 3, the battery circuit 100 provided in the embodiment of the present disclosure further includes a first recirculation unit 110 and a second recirculation unit 111. The input terminal of the first recirculation unit 110 is connected to the second terminal of the first switch 105, and the output terminal of the first recirculation unit 110 is connected to the first terminal of the first switch 105, and The input terminal of the second recirculation unit 111 is connected to the second end of the second switch 106, and the output terminal of the second recirculation unit 111 is connected to the first end of the second switch 106.

[0096] In the embodiments of this disclosure, at the initial point in time when the second switch 106 is controlled to close and the first switch 105 is controlled to open, it is generally impossible to control the first switch 105 to open immediately due to the effects of the return time and operating time of the first switch 105. As a result, the first switch 105 and the second switch 106 short-circuit for a short time, and the short circuit causes the first battery pack 102 and the second battery pack 103 to burn out.

[0097] In the embodiments of this disclosure, the second recirculation unit 111 is configured to be connected in parallel at both ends of the second switch 106, and recirculation is performed by the second recirculation unit 111. In this way, the time at which the second switch 106 is controlled to close when the first switch 105 is controlled to open can be delayed, thereby avoiding the problem of the first battery pack 102 and the second battery pack 103 short-circuiting and burning out.

[0098] Similarly, in the embodiments of this disclosure, the first recirculation unit 110 is configured to be connected in parallel at both ends of the first switch 105, and recirculation is performed by the first recirculation unit 110. This allows for a delay in the time it takes for the first switch 105 to be closed when the second switch 106 is controlled to be opened, thereby avoiding the problem of the first battery pack 102 and the second battery pack 103 short-circuiting and burning out.

[0099] In one embodiment of the present disclosure, as shown in Figure 4, the first recirculation unit 110 is a first diode 1101, and the second recirculation unit 111 is a second diode 1111. The anode of the first diode 1101 is connected to the second end of the first switch 105, the cathode of the first diode 1101 is connected to the first end of the first switch 105, and The anode of the second diode 1111 is connected to the second end of the second switch 106, and the cathode of the second diode 1111 is connected to the first end of the second switch 106.

[0100] Embodiments of this disclosure provide a first recirculation unit 110 and a second recirculation unit 111 with a simple structure, thereby reducing hardware cost, design complexity, and the board footprint of the battery circuit 100.

[0101] In one embodiment of the present disclosure, as shown in Figure 3, the battery circuit 100 provided in the embodiment of the present disclosure further includes a voltage stabilization unit 112, The voltage stabilization unit 112 is connected between the power supply terminal 101 and the ground terminal 107.

[0102] In embodiments of this disclosure, on the one hand, the voltage stabilization unit 112 is configured to filter voltage fluctuations on the bus, i.e., the line on which the power supply terminal 101 of the battery circuit 100 is located, thereby stabilizing the voltage supplied to the load. On the other hand, the voltage stabilization unit is configured to reduce the adverse effects on the second battery pack 103 of voltage fluctuations jointly generated by the first battery pack 102 and the transformer unit 104.

[0103] In one embodiment of this disclosure, as shown in Figure 4, the voltage stabilization unit 112 may be, for example, a second capacitor 1121. Indeed, the voltage stabilization unit 112 may be implemented in an alternative manner.

[0104] In one embodiment of this disclosure, the second capacitor 1121 is a support capacitor, and the value of the second capacitor 1121 may be set within the range of 2μF to 1500μF.

[0105] Embodiments of this disclosure provide a voltage stabilization unit 112 with a simple structure, which reduces hardware cost, design complexity, and the board footprint of the battery circuit 100.

[0106] As shown in Figure 5, the transformer unit 104 in the battery circuit 100 provided in the embodiment of the present disclosure is a second inductor 1041, and the first switch 105 and the second switch 106 form a first bridge arm. Based on this, the battery circuit 100 provided in the embodiment of the present disclosure further includes a second bridge arm and a third inductor 115, and the first bridge arm and the second bridge arm form a full bridge circuit. The second bridge arm is connected in parallel with the first bridge arm and bridges the positive terminal of the first battery pack 102 and the negative terminal of the second battery pack 103. One end of the third inductor 115 is connected to the midpoint of the second bridge arm, and the other end of the third inductor 115 is connected to the negative terminal of the first battery pack 102 and the positive terminal of the second battery pack 103, and The control unit 108 is connected to a second bridge arm and is further configured to control the full bridge circuit to supply power to the first battery pack 102 and / or the second battery pack 103.

[0107] According to one embodiment of the present disclosure, the control unit 108 is particularly configured to control the full-bridge circuit to a non-operating state to connect the first battery pack 102 and the second battery pack 103 in series and supply power, or to control the full-bridge circuit to an operating state to supply power to the first battery pack 102 and / or the second battery pack 103.

[0108] Specifically, as shown in Figure 5, when the control unit 108 controls the full-bridge circuit to a non-operating state, the first battery pack 102 and the second battery pack 103 are connected in series, discharged, and power is supplied to the load. When the control unit 108 controls the full-bridge circuit to an operating state, the first bridge arm and the second bridge arm of the full-bridge circuit alternately become operating. When the first bridge arm is operating, the upper and lower bridge arms of the first bridge arm alternately turn on. When the control unit 108 controls the upper bridge arm of the first bridge arm to turn off and the lower bridge arm to turn on within a first preset time, the second battery pack 103 charges the second inductor 1041. When the control unit controls the upper bridge arm of the first bridge arm to be turned on and the lower bridge arm to be turned off within a second preset time, the second inductor 1041 discharges its stored electrical energy to supply power to the load, and the second inductor 1041 realizes the boost function. In this case, the electrical energy supplied to the load by the first battery pack 102 decreases, and the output current decreases. Similarly, when the second bridge arm is in operation, when the control unit 108 controls the upper bridge arm of the second bridge arm to be turned off and the lower bridge arm to be turned on, the second battery pack 103 charges the third inductor 115. When the control unit controls the upper bridge arm of the second bridge arm to be turned on and the lower bridge arm to be turned off, the third inductor 115 discharges its stored electrical energy to supply power to the load, and the third inductor 115 realizes the boost function. During the process in which the second battery pack 103 charges the second inductor 1041 or the third inductor 115, the battery circuit 100 supplies power to the load only through the first battery pack 102. This process is repeated. When the voltage at the output terminal of the second inductor 1041 (the terminal connected to the first bridge arm) or the output terminal of the third inductor 115 (the terminal connected to the second bridge arm) rises to equal the bus voltage, the first battery pack 102 becomes an open circuit, and the output current of the first battery pack 102 becomes zero.In this case, the battery circuit 100 supplies power to the load only through the second battery pack 103, and the output power of the second battery pack 103 during discharge is higher than the power that the second battery pack 103 can output. This allows for a stable supply of power to the load, and by keeping the second battery pack 103 in a continuous discharge state, current ripple can be reduced.

[0109] If one of the bridge arms in the full bridge circuit fails, for example, if the first bridge arm fails, energy may be stored through the third inductor and the second bridge arm, thereby boosting the voltage of the second battery pack 103 and supplying power to the load, thereby improving the reliability of the battery circuit 100.

[0110] Therefore, the battery circuit in the embodiment of the present disclosure can reduce control difficulties by performing phase transition control on the double bridge arm of the full bridge circuit via the control unit 108, and the second battery pack 103 can supply power continuously and stably, thereby improving the reliability of the power supply, reducing current ripple, and avoiding a shortening of battery life due to frequent battery charging.

[0111] According to one embodiment of the present disclosure, as shown in Figure 6, the battery circuit 100 further includes a current sampling unit 116 configured to acquire the current of a first battery pack 102 and / or a second battery pack 103, the current of a second inductor 1041, and the current of a third inductor 115, and a control unit 108 to supply power to the first battery pack 102 and / or the second battery pack 103 by controlling a full-bridge circuit based on the acquired currents. The current sampling unit 116 may consist of current sensors placed in the circuit. The current sensors may collect various branches, such as the current of the first battery pack 102, the current of the second battery pack 103, the current of the second inductor 1041, and the current of the third inductor 115.

[0112] According to one embodiment of the present disclosure, the current sampling unit 116 acquires the current of the second battery pack 103 when discharging the first battery pack 102, and the current sampling unit 116 acquires the current of the first battery pack 102 when discharging the second battery pack 103.

[0113] Specifically, the current sampling unit 116 collects the current of the second battery pack 103 when the first battery pack 102 is discharged, and samples the current of the first battery pack 102 when the second battery pack 103 is discharged. After acquiring the current of the first battery pack 102 and / or the current of the second battery pack 103, the current of the second inductor 1041, and the current of the third inductor 115, the current sampling unit 116 sends these current values ​​to the control unit 108. The control unit 108 generates a control signal according to the current of the first battery pack 102 and / or the current of the second battery pack 103, the current of the second inductor 1041, and the current of the third inductor 115. The control unit 108 controls the first and second bridge arms of the full-bridge circuit to operate alternately according to its control signal, and continues to boost the voltage of the second battery pack 103 by alternately charging and discharging the second inductor 1041 and the third inductor 115.

[0114] According to one embodiment of the present disclosure, as shown in Figure 7, the control unit 108 includes a first signal generation subunit 1081, a second signal generation subunit 1082, and a control subunit 1083. The first signal generation subunit 1081 is configured to generate a first control signal and a second control signal complementary to the first control signal according to a first current difference between a preset reference current and the current of the first battery pack 102 or the current of the second battery pack 103; the second signal generation subunit 1082 is configured to generate a third control signal and a fourth control signal complementary to the third control signal according to a second current difference between the current of the second inductor 1041 and the current of the third inductor 115; and the control subunit 1083 is configured to control a full-bridge circuit based on the first control signal, the second control signal, the third control signal, and the fourth control signal.

[0115] According to one embodiment of the present disclosure, as shown in Figure 8, the first signal generation subunit 1081 includes a first subtractor A1, a first regulator B1, a first signal generator P1, and a first inverter N1, wherein the first subtractor A1 is configured to obtain a first current difference between a preset reference current and the current of the first battery pack 102 or the current of the second battery pack 103, the first regulator B1 is configured to obtain a first given value by performing proportional-integral (PI) adjustment on the first current difference, the first signal generator P1 is configured to generate a first control signal according to a first given value and a first preset signal, and the first inverter N1 is configured to obtain a second control signal by inverting the first control signal. The second signal generation subunit 1082 includes a second subtractor A2, a second regulator B2, a second signal generator P2, and a second inverter N2, wherein the second subtractor A2 is configured to obtain a second current difference between the current of the second inductor 1041 and the current of the third inductor 115, the second regulator B2 is configured to obtain a second given value by performing proportional-integral (PI) adjustment on the second current difference, the second signal generator P2 is configured to generate a third control signal according to the second given value and a second preset signal, and the second inverter N2 is configured to obtain a fourth control signal by inverting the third control signal, the first preset signal and the second preset signal being half-period phase-shifted. The first preset signal and the second preset signal may each be sawtooth wave signals, the minimum value of the sawtooth wave signal being 0 and the maximum value of the sawtooth wave signal being 1.

[0116] Specifically, as shown in Figure 8, the current sampling unit 116 collects the current of the first battery pack 102 and / or the current of the second battery pack 103, the current of the second inductor 1041, and the current of the third inductor 115 in real time, respectively, and obtains the current I of the first battery pack 102 or the second battery pack 103, the current I1 of the second inductor 1041, and the current I2 of the third inductor 115. A preset reference current Iref and the current I of the first battery pack 102 or the current I of the second battery pack 103 are input to the first subtractor A1 to calculate the difference and obtain the first current difference ΔI1. The first current difference ΔI1 is used as the input to the first regulator B1 to perform PI adjustment on the first current difference ΔI1 and obtain a first given value, which is a value that fluctuates between 0 and 1. A first given value and a first preset signal STW1 are input to a first signal generator P1 for comparison. If the first given value is greater than the value of the first preset signal STW1, the first signal generator P1 outputs 1; otherwise, the first signal generator outputs 0 to obtain a first control signal PWM1 having a square wave waveform. A second control signal PWM2 may be obtained by inverting the first control signal PWM1 via a first inverter N1.

[0117] The currents I1 of the second inductor and I2 of the third inductor are input to the second subtractor A2 to calculate the difference and obtain the second difference ΔI2. The second difference ΔI2 is used as the input to the second regulator B2 to perform PI adjustment on the second difference and obtain the second given value, which is a value that varies between 0 and 1. The second given value and the value of the second preset signal STW2 are input to the second signal generator P2 for comparison. If the second given value is greater than the value of the second preset signal STW2, the second signal generator P2 outputs 1; otherwise, the second signal generator outputs 0 to obtain the third control signal PWM3 having a square wave waveform. A fourth control signal PWM4 may be obtained by inverting the third control signal PWM3 via the second inverter N2. Since the first preset signal STW1 and the second preset signal STW2 are out of phase by half a period, the first control signal PWM1 and the second control signal PWM2 are out of phase by half a period with respect to the third control signal PWM3 and the fourth control signal PWM4, respectively. This enables alternating control of the first and second bridge arms of the full bridge circuit.

[0118] According to one embodiment of the present disclosure, as shown in Figure 9, the first bridge arm includes a first switch and a second switch, the first end of the first switch being connected to the positive terminal of the first battery pack 102, the second end of the first switch being connected to the first end of the second switch to form a first connection point J1, the second end of the second switch being connected to the negative terminal of the second battery pack 103, and the first connection point J1 being connected to one end of the second inductor 1041. The second bridge arm includes a third switch and a fourth switch, the first end of the third switch being connected to the positive terminal of the first battery pack 102, the second end of the third switch being connected to the first end of the fourth switch to form a second connection point J2, the second end of the fourth switch being connected to the negative terminal of the second battery pack 103, and the second connection point J2 being connected to one end of the third inductor 115.

[0119] According to one embodiment of the present disclosure, the control subunit 1083 is configured to control a first switch of a first bridge arm according to a first control signal, a second switch of a first bridge arm according to a second control signal, a third switch of a second bridge arm according to a third control signal, and a fourth switch of a second bridge arm according to a fourth control signal.

[0120] Specifically, as shown in Figure 9, the current sampling unit 116 may collect the current of the first battery pack 102 and / or the current of the second battery pack 103, the current of the second inductor 1041, and the current of the third inductor 115. The control unit 108 generates PWM control signals corresponding to the first, second, third, and fourth switches, respectively, according to the current of the first battery pack 102 or the current of the second battery pack 103, the current of the second inductor 1041, and the current of the third inductor 115. The control unit 108 outputs the control signal corresponding to each switch to the control end of the switch, controlling the opening and closing of the switch. It should be understood that if two switches on the same bridge arm are closed simultaneously, the bridge arm will be straightened, the battery circuit 100 will be short-circuited, and the first battery pack 102 and the second battery pack 103 will be damaged. Therefore, the first switch and the second switch cannot be closed simultaneously, and the third switch and the fourth switch cannot be closed simultaneously. Accordingly, the first control signal corresponding to the first switch may be set to be opposite to the second control signal corresponding to the second switch, the third control signal corresponding to the third switch may be set to be opposite to the fourth control signal corresponding to the fourth switch, and the first control signal corresponding to the first switch and the third control signal corresponding to the third switch may be set to be half a period out of phase.

[0121] When the control unit 108 controls the full-bridge circuit to an activated state, the first and second bridge arms of the full-bridge circuit alternately become activated. The control subunit 1083 controls the first switch to close according to the first control signal and the second switch to open according to the second control signal, thereby discharging the electrical energy stored in the second inductor 1041, boosting the voltage of the second battery pack 103, and supplying power to the load. After half a cycle, the control subunit 1083 controls the first switch 105 to open according to the first control signal and the second switch to close according to the second control signal. In this case, the second battery pack 103, the second inductor 1041, and the second switch form a loop and charge the second inductor 1041. In addition, the control subunit controls the third switch to close according to the third control signal and the fourth switch to open according to the fourth control signal, thereby discharging the electrical energy stored in the third inductor 115, boosting the voltage of the second battery pack 103, and supplying power to the load. After another half cycle, the control subunit controls the third switch to open according to the third control signal and the fourth switch to close according to the fourth control signal. In this case, the second battery pack 103, the third inductor 115, and the fourth switch form a loop and charge the third inductor. In addition, the control subunit controls the first switch to close according to the first control signal and the second switch to open according to the second control signal, so that the second inductor 1041 supplies power to the load. The process is repeated in this manner.

[0122] According to one embodiment, the control subunit 1083 is configured to control the third switch of the second bridge arm according to the first control signal and the fourth switch of the second bridge arm according to the second control signal when the first bridge arm fails.

[0123] Specifically, the second inductor 1041 cannot supply power to the load if the first bridge arm fails. In this case, since the current I1 of the second inductor 1041 is 0, an accurate and appropriate third control signal and an accurate and appropriate fourth control signal cannot be obtained. The control subunit 1083 may control the third switch of the second bridge arm according to the first control signal and control the fourth switch of the second bridge arm according to the second control signal. The specific process is as follows: The control subunit 1083 controls the third switch to be closed according to the first control signal PWM1 and controls the fourth switch to be opened according to the second control signal PWM2, thereby discharging the electrical energy stored in the third inductor 115, boosting the voltage of the second battery pack 103, and supplying power to the load. After half a cycle, the control subunit 1083 controls the third switch to open according to the first control signal PWM1 and the fourth switch to close according to the second control signal PWM2. In this case, the second battery pack 103, the third inductor 115, and the fourth switch form a loop and charge the third inductor 115. After another half cycle, the control subunit 1083 controls the third switch to close according to the first control signal PWM1 and the fourth switch to open according to the second control signal PWM2, thereby discharging the electrical energy stored in the third inductor 115, boosting the voltage of the second battery pack 103, and supplying power to the load. This process is repeated.

[0124] According to one embodiment of the present disclosure, as shown in Figure 9, the first switch 105 is connected in reverse parallel to the first freewheeling unit 110, the second switch 106 is connected in reverse parallel to the second freewheeling unit 111, the third switch 113 is connected in reverse parallel to the third freewheeling unit, and the fourth switch 114 is connected in reverse parallel to the fourth freewheeling unit. Figure 9 is shown using an example in which the third freewheeling unit is the third diode 117 and the fourth freewheeling unit is the fourth diode 118.

[0125] Specifically, in the process of the battery circuit 100 supplying power to the load normally, the first switch and the second switch are opened and closed in sequence, and the third switch and the fourth switch are opened and closed in sequence. If two switches on the same bridge arm are closed simultaneously, the bridge arm will be straight, and the battery circuit 100 will be short-circuited. Therefore, this condition should be avoided. However, the switches on the bridge arm are not ideal devices, and the opening and closing times of the switches do not strictly coincide. To avoid the bridge arm moving straight, a "dead time" is usually set. The phenomenon of the bridge arm moving straight is avoided by controlling one switch on the bridge arm to open first, and then closing the other switch after the dead time has ended. During the dead time, all switches on the same bridge arm are open, and the electrical energy stored in the inductor can cause a high-voltage shock to the switches, potentially damaging them. By using antiparallel diodes for the switches in the bridge arm, recirculation is performed during the dead time, thereby avoiding damage to the switches.

[0126] For example, as shown in Figure 9, when the control unit 108 controls the first switch 105 to change from the open state to the closed state, the second switch 106 is first controlled to change from the closed state to the open state. During the dead time, both the first switch 105 and the second switch 106 are open. The electrical energy stored by the second inductor 1041 is recirculated by the first anti-parallel return unit 110 of the first switch 105 to supply power to the load. After the dead time ends, the first switch 105 is changed from the open state to the closed state, and the second inductor 1041 supplies power to the load via the first switch 105. In the process of controlling the third switch 113 to change from the open state to the closed state, the electrical energy stored by the third inductor 115 is recirculated by the third anti-parallel return unit of the third switch 113. Based on a similar principle, when both the first battery pack 102 and the second battery pack 103 are being charged, recirculation occurs through the second antiparallel recirculation unit 110 of the second switch 106 and the fourth antiparallel recirculation unit of the fourth switch 114, thus avoiding the effects of high voltage on the second switch 106 and the fourth switch 114. The specific principle is the same as the principle of supplying power to a load, and the details will not be repeated here.

[0127] It should be noted that in embodiments of this disclosure, the switch may be a power switch tube, a metal oxide semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), or an element having turn-on and turn-off functions such as silicon carbide (SiC).

[0128] As described above, according to the battery circuit of the embodiment of this disclosure, a first battery pack and a second battery pack are connected in series to supply power to a load. Phase transition control is performed on the dual bridge arms of the full-bridge circuit via a control unit, reducing the difficulty of control. In this way, the first inductor and the second inductor can separately store energy to boost the voltage of the second battery pack, thereby allowing the second battery pack to stably supply power to the load. Thus, by the circuit controlling the full-bridge circuit via a control unit, the second battery pack can supply power continuously and stably, improving the reliability of the power supply, reducing current ripple, and avoiding a shortened battery life due to frequent battery charging.

[0129] Corresponding to the embodiments shown in Figures 5 to 9, this disclosure further provides a control method for a battery circuit.

[0130] As shown in Figure 10, the control method for a battery circuit provided in the embodiments of this disclosure is applied to the aforementioned battery circuit and the method includes the following steps. S1. The current of the first battery pack 102 and / or the current of the second battery pack 103, the current of the second inductor 1041, and the current of the third inductor 115 are obtained. S2. The full-bridge circuit is controlled based on the acquired current to supply power to the first battery pack 102 and / or the second battery pack 103.

[0131] According to one embodiment of the present disclosure, the control of a full-bridge circuit based on acquired currents to power a first battery pack 102 and / or a second battery pack 103 includes the acquisition of a first current difference between a preset reference current and the current of the first battery pack 102 or the current of the second battery pack 103, the generation of a first control signal and a second control signal complementary to the first control signal according to the first current difference, the acquisition of a second current difference between the current of the second inductor 1041 and the current of the third inductor 115, the generation of a third control signal and a fourth control signal complementary to the third control signal according to the second current difference, and the control of the full-bridge circuit according to the first control signal, the second control signal, the third control signal, and the fourth control signal. The preset reference current may be calibrated according to specific parameters of the first battery pack 102 and the second battery pack 103.

[0132] According to one embodiment of the present disclosure, the generation of a first control signal and a second control signal complementary to the first control signal according to a first current difference includes the following: proportional-integral adjustment is performed on the first current difference to obtain a first given value; a first control signal is generated according to the first given value and a first preset signal; the first control signal is inverted to obtain a second control signal; proportional-integral adjustment is performed on the second current difference to obtain a second given value; a third control signal is generated according to the second given value and a second preset signal; the third control signal is inverted to obtain a fourth control signal; and the first preset signal and the second preset signal are out of phase by half a period. The first preset signal and the second preset signal may each be sawtooth wave signals, the minimum value of the sawtooth wave signal is 0, and the maximum value of the sawtooth wave signal is 1.

[0133] According to one embodiment of the present disclosure, the control of a full bridge circuit according to a first control signal, a second control signal, a third control signal, and a fourth control signal includes the first switch 105 of the first bridge arm being controlled according to the first control signal, the second switch 106 of the first bridge arm being controlled according to the second control signal, the third switch of the second bridge arm being controlled according to the third control signal when the first bridge arm is operating normally, the fourth switch of the second bridge arm being controlled according to the fourth control signal, and the third switch of the second bridge arm being controlled according to the first control signal and the fourth switch of the second bridge arm being controlled according to the second control signal when the first bridge arm fails.

[0134] Details not disclosed in the battery circuit control method of the embodiments of this disclosure can be found in the details disclosed in the battery circuit of the embodiments of this disclosure and will not be repeated here.

[0135] Based on the above, according to the battery circuit control method of the embodiment of the present disclosure, the current of the first battery pack and / or the current of the second battery pack, the current of the second inductor, and the current of the third inductor are acquired, a control signal is generated based on the acquired currents, and phase transition control is performed on the full bridge circuit. In this way, the present method can perform phase transition control on the double bridge arm of the full bridge circuit, thereby reducing the difficulty of control, the second battery pack can supply power continuously and stably, thereby improving the reliability of power supply, reducing current ripple, and avoiding a shortening of battery life caused by frequent battery charging.

[0136] In accordance with the embodiments described above, this disclosure further provides a computer-readable storage medium.

[0137] The computer-readable storage medium in the embodiments of this disclosure stores a power control program. When the power control program is executed by the processor, the aforementioned battery circuit control method is realized.

[0138] According to the computer-readable storage medium in the embodiments of the present disclosure, by performing the aforementioned control method for the battery circuit, phase transition control can be performed on the double bridge arm of the full-bridge circuit, thereby reducing the difficulty of control, and the second battery pack can supply power continuously and stably, thereby improving the reliability of the power supply, reducing current ripple, and avoiding a shortening of battery life due to frequent charging of the battery.

[0139] One embodiment of the present disclosure further provides a vehicle 200. As shown in Figure 11, the vehicle 200 includes a battery circuit 100 according to any of the embodiments described above.

[0140] In embodiments of this disclosure, the vehicle is an electric vehicle or a hybrid vehicle.

[0141] It should be noted that logic and / or steps shown in a flowchart or described in any other way herein, such as an ordered list that may be considered executable instructions used to perform a logical function, may be specifically implemented by an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or another system that can take instructions from an instruction execution system, apparatus, or device and execute those instructions), or on any computer-readable medium for use in conjunction with an instruction execution system, apparatus, or device. In the context herein, “computer-readable medium” may be any device that can store, communicate, propagate, or transmit programs, which may be used by or in conjunction with an instruction execution system, apparatus, or device. More specific examples (a non-exclusive list) of computer-readable mediums include electrical connections with one or more wires (electronic equipment), portable computer diskettes (magnetic equipment), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber devices, and portable compact disk read-only memory (CDROM). Furthermore, the computer-readable medium may be a single sheet of paper for printing the program, or another suitable medium, for example, by performing an optical scan on the paper or other medium, followed by editing and decoding, or by another suitable method if the program needs to be obtained electronically. The program is then stored in computer memory.

[0142] It should be understood that parts of this disclosure can be implemented by hardware, software, firmware, or a combination thereof. In the embodiments described above, multiple steps or methods can be implemented by using software or firmware stored in memory and executed by an appropriate instruction execution system. For example, if a pre-defined part of the disclosure is implemented by hardware, as in another embodiment, the part may be implemented by one or a combination of the following common technologies in the art: discrete logic circuits for logic gate circuits to realize logic functions on data signals, application-specific integrated circuits having appropriate composite logic gate circuits, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0143] In this specification, the terms “embodiment,” “some embodiments,” “example,” “specific example,” or “some examples” are used to mean that any particular feature, structure, material, or property described with reference to an embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the general descriptions of the terms used herein do not necessarily refer to the same embodiment or example. Furthermore, any particular feature, structure, material, or property described may be combined in any one or more embodiments or examples in an appropriate manner.

[0144] Furthermore, the terms “first” and “second” are used solely for descriptive purposes and should not be understood as indicating or implying relative importance or implicitly specifying the quantity of the technical features described. Therefore, features defined by “first” or “second” may explicitly or implicitly include at least one such feature. In this disclosure, unless otherwise specified, “multiple” means at least two, e.g., two or three.

[0145] In this disclosure, unless otherwise expressly specified and limited, the terms “attachment,” “connection,” “connection,” and “fixing” should be understood in a broad sense. For example, unless otherwise expressly specified, a connection may be a fixed connection, a removable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection via an intermediate medium; it may be internal communication between two elements or an interaction relationship between two elements. Those skilled in the art will understand the specific meaning of the foregoing terms in this disclosure depending on the particular circumstances.

[0146] The embodiments of this disclosure have been described above. The foregoing description is illustrative and not exhaustive, and is not limited to the embodiments disclosed. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the embodiments described. The terms used herein have been chosen to best describe the principles, practical applications, or technical improvements to the technology of the embodiments or to enable those skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. It comprises a power supply terminal (101), a first battery pack (102), a second battery pack (103) of a different type from the first battery pack (102), a transformer unit (104), a first switch (105), a second switch (106), and a ground terminal (107), The positive terminal of the first battery pack (102) is connected to the power supply terminal (101), and the negative terminal of the first battery pack (102) is connected to the positive terminal of the second battery pack (103). The negative terminal of the second battery pack (103) is connected to the ground terminal (107), The first end of the first switch (105) is connected to the power supply end (101), and the second end of the first switch (105) is connected to the first end of the second switch (106), The second end of the second switch (106) is connected to the ground end (107), The transformer unit (104) is connected between the negative terminal of the first battery pack (102) and the second end of the first switch (105). The system further comprises a control unit (108), the first end of which is connected to the control end of the first switch (105), and the second end of which is connected to the control end of the second switch (106). The control unit (108) is configured to open and close the first switch (105) and the second switch (106) in accordance with a first preset control rule in order to increase the output power of the second battery pack (103) under a first preset condition, and / or In a second set of conditions, the first switch (105) and the second switch (106) are configured to be opened and closed according to a second set of control rules in order to make the input power of the first battery pack (102) different from the input power of the second battery pack (103), and / or In a third set of conditions, the first battery pack (105) and the second switch (106) are configured to be opened and closed according to a third set of control rules in order to cause the first battery pack (102) to charge the second battery pack (103), or the second battery pack (103) to charge the first battery pack (102), and / or In a fourth set condition, the first switch (105) and the second switch (106) are configured to be opened so that the first battery pack (102) and the second battery pack (103) are connected in series for discharge or charge. The transformer unit (104) is a second inductor (1041), the first switch (105) and the second switch (106) form a first bridge arm, the battery circuit (100) further comprises a second bridge arm and a third inductor (115), and the first bridge arm and the second bridge arm form a full bridge circuit. The second bridge arm is connected in parallel with the first bridge arm and bridges the positive terminal of the first battery pack (102) and the negative terminal of the second battery pack (103). One end of the third inductor (115) is connected to the midpoint of the second bridge arm, and the other end of the third inductor (115) is connected to the negative terminal of the first battery pack (102) and the positive terminal of the second battery pack (103), respectively, and The control unit (108) is connected to the second bridge arm, and the control unit (108) is further configured to control the full bridge circuit to supply power to the first battery pack (102) and / or the second battery pack (103). Battery circuit (100).

2. The first battery pack (102) is a power-type battery pack, and the second battery pack (103) is an energy-type battery pack, or The first battery pack (102) is an energy-type battery pack, and the second battery pack (103) is a power-type battery pack. The battery circuit (100) according to claim 1.

3. The first battery pack (102) is the power type battery pack, the second battery pack (103) is the energy type battery pack, and the battery circuit (100) further comprises a filtering unit (109). The first end of the filtering unit (109) is connected to the positive terminal of the first battery pack (102), the second end of the filtering unit (109) is connected to the power supply terminal (101), and the third end of the filtering unit (109) is connected to the negative terminal of the first battery pack (102). The battery circuit (100) according to claim 2.

4. The filtering unit (109) comprises a first inductor (1091) and a first capacitor (1092), The first end of the first inductor (1091) is connected to the positive terminal of the first battery pack (102), the second end of the first inductor (1091) is connected to the power supply terminal (101), and The first end of the first capacitor (1092) is connected to the first end of the first inductor (1091), and the second end of the first capacitor (1092) is connected to the negative terminal of the first battery pack (102). The battery circuit (100) according to claim 3.

5. The system further comprises a first recirculation unit (110) and a second recirculation unit (111), The input terminal of the first recirculation unit (110) is connected to the second terminal of the first switch (105), and the output terminal of the first recirculation unit (110) is connected to the first terminal of the first switch (105), and The input terminal of the second recirculation unit (111) is connected to the second terminal of the second switch (106), and the output terminal of the second recirculation unit (111) is connected to the first terminal of the second switch (106). The battery circuit (100) according to claim 1.

6. The first freewheeling unit (110) is a first diode (1101), and the second freewheeling unit (111) is a second diode (1111), The anode of the first diode (1101) is connected to the second end of the first switch (105), and the cathode of the first diode (1101) is connected to the first end of the first switch (105), and The anode of the second diode (1111) is connected to the second end of the second switch (106), and the cathode of the second diode (1111) is connected to the first end of the second switch (106). The battery circuit (100) according to claim 5.

7. Further equipped with a voltage stabilization unit (112), The voltage stabilization unit (112) is connected between the power supply terminal (101) and the ground terminal (107). The battery circuit (100) according to claim 1.

8. The battery circuit (100) according to claim 7, wherein the voltage stabilization unit (112) is a second capacitor (1121).

9. The battery circuit (100) according to claim 1, wherein the voltage transformer unit (104) is a second inductor (1041).

10. The control unit (108) The full-bridge circuit is controlled to a non-operating state, and the first battery pack (102) and the second battery pack (103) are connected in series to supply power, or The full-bridge circuit is controlled to be in an operating state to supply power to the first battery pack (102) and / or the second battery pack (103). The battery circuit (100) according to claim 1, further configured as follows.

11. The system further comprises a current sampling unit (116) configured to acquire the current of the first battery pack (102) and / or the current of the second battery pack (103), the current of the second inductor (1041), and the current of the third inductor (115), The control unit (108) controls the full-bridge circuit based on the acquired current in order to supply power to the first battery pack (102) and / or the second battery pack (103). The battery circuit (100) according to claim 10.

12. The control unit (108) A first signal generation subunit (1081) is configured to generate a first control signal and a second control signal complementary to the first control signal according to a first current difference between a preset reference current and the current of the first battery pack (102) or the current of the second battery pack (103), A second signal generation subunit (1082) is configured to generate a third control signal and a fourth control signal complementary to the third control signal according to a second current difference between the current of the second inductor and the current of the third inductor, A control subunit (1083) is configured to control the full-bridge circuit based on the first control signal, the second control signal, the third control signal, and the fourth control signal. The battery circuit (100) according to claim 11, comprising:

13. The first signal generation subunit (1081) comprises a first subtractor (A1), a first regulator (B1), a first signal generator (P1), and a first inverter (N1). The first subtractor (A1) is configured to acquire the first current difference between the preset reference current and the current of the first battery pack (102) or the current of the second battery pack (103), The first regulator (B1) is configured to obtain a first given value by performing proportional-integral adjustment with respect to the first current difference. The first signal generator (P1) is configured to generate the first control signal according to the first given value and the first preset signal, The first inverter (N1) is configured to invert the first control signal to obtain the second control signal. The second signal generation subunit (1082) comprises a second subtractor (A2), a second regulator (B2), a second signal generator (P2), and a second inverter (N2). The second subtractor (A2) is configured to obtain the second current difference between the current of the second inductor and the current of the third inductor. The second regulator (B2) is configured to obtain a second given value by performing proportional-integral adjustment with respect to the second current difference. The second signal generator (P2) is configured to generate the third control signal according to the second given value and the second preset signal. The second inverter (N2) is configured to invert the third control signal to obtain the fourth control signal. The first preset signal and the second preset signal are out of phase by half a period. The battery circuit (100) according to claim 12.

14. The current sampling unit (116) acquires the current of the second battery pack (103) when the first battery pack (102) is discharged, The current sampling unit (116) acquires the current of the first battery pack (102) when the second battery pack (103) is discharged. A battery circuit (100) according to any one of claims 11 to 13.

15. The second end of the first switch (105) and the first end of the second switch (106) form a first connection point (J1). The second bridge arm comprises a third switch (113) and a fourth switch (114), The first end of the third switch (113) is connected to the positive terminal of the first battery pack (102), the second end of the third switch (113) is connected to the first end of the fourth switch (114) to form a second connection point (J2), the second end of the fourth switch (114) is connected to the negative terminal of the second battery pack (103), and the second connection point (J2) is connected to one end of the third inductor (115). The battery circuit (100) according to claim 12.

16. The system further comprises a third recirculation unit (117) and a fourth recirculation unit (118), The input terminal of the third recirculation unit (117) is connected to the second terminal of the third switch (113), and the output terminal of the third recirculation unit (117) is connected to the first terminal of the third switch (113), The input end of the fourth recirculation unit (118) is connected to the second end of the fourth switch (114), and the output end of the fourth recirculation unit (118) is connected to the first end of the fourth switch (114). The battery circuit (100) according to claim 15.

17. The control subunit (1083) The first switch (105) of the first bridge arm is controlled according to the first control signal, and the second switch (106) of the first bridge arm is controlled according to the second control signal. The third switch (113) is controlled according to the third control signal, and the fourth switch (114) is controlled according to the fourth control signal. A battery circuit (100) according to claim 15 or 16, further configured as follows.

18. The control subunit (1083) If the first bridge arm fails, the third switch (113) is controlled according to the first control signal, and the fourth switch (114) is controlled according to the second control signal. The battery circuit (100) according to claim 17, further configured as follows.

19. A control method for a battery circuit, applicable to the battery circuit (100) described in claim 1, The steps include obtaining the current of the first battery pack (102) and / or the current of the second battery pack (103), the current of the second inductor (1041), and the current of the third inductor (115), The steps include controlling the full-bridge circuit based on the acquired current to supply power to the first battery pack (102) and / or the second battery pack (103), A control method including

20. The step of controlling the full-bridge circuit based on the acquired current to supply power to the first battery pack (102) and / or the second battery pack (103) is, The steps include: obtaining a first current difference between a preset reference current and the current of the first battery pack (102) or the current of the second battery pack (103); and generating a first control signal and a second control signal complementary to the first control signal according to the first current difference; The steps include obtaining a second current difference between the current of the second inductor (1041) and the current of the third inductor (115), and generating a third control signal and a fourth control signal complementary to the third control signal according to the second current difference, The steps of controlling the full-bridge circuit according to the first control signal, the second control signal, the third control signal, and the fourth control signal, The method according to claim 19, including the method described in claim 19.

21. The step of generating a first control signal and a second control signal complementary to the first control signal according to the first current difference is, The steps include: obtaining a first given value by performing proportional-integral adjustment on the first current difference; generating a first control signal according to the first given value and a first preset signal; and obtaining a second control signal by inverting the first control signal. A step of obtaining a second given value by performing proportional-integral adjustment on the second current difference, generating a third control signal according to the second given value and a second preset signal, and obtaining a fourth control signal by inverting the third control signal, wherein the first preset signal and the second preset signal are out of phase by half a period. The method according to claim 20, including the method described in claim 20.

22. The step of controlling the full-bridge circuit according to the first control signal, the second control signal, the third control signal, and the fourth control signal is, The steps include controlling the first switch (105) of the first bridge arm according to the first control signal and controlling the second switch (106) of the first bridge arm according to the second control signal, When the first bridge arm is operating normally, the third switch of the second bridge arm is controlled according to the third control signal, and the fourth switch of the second bridge arm is controlled according to the fourth control signal. The steps include: controlling the third switch of the second bridge arm in accordance with the first control signal and controlling the fourth switch of the second bridge arm in accordance with the second control signal when the first bridge arm fails; The method according to claim 20 or 21, including the method described in claim 20 or 21.

23. A vehicle comprising the battery circuit (100) described in claim 1.

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