Battery circuit and vehicle

Abstract

A battery circuit (100) comprising a power supply terminal (101), a first battery pack (102), a second battery pack (103), a voltage conversion unit (104), a first switch (105), a second switch (106), a ground terminal (107), and a control unit (108). The positive electrode of the first battery pack (102) is connected to the power supply terminal (101), the negative electrode of the first battery pack (102) is connected to the positive electrode of the second battery pack (103), the negative electrode of the second battery pack (103) is connected to the ground terminal (107), a first terminal of the first switch (105) is connected to the power supply terminal (101), a second terminal of the first switch (105) is connected to a first terminal of the second switch (106), and a control terminal of the first switch (105) is connected to a first output terminal of the control unit (108). A first end of the first battery pack (102) is connected to a power end of the first battery pack (102), a second end of the second switch (106) is connected to a ground end (107), a control end of the second switch (106) is connected to a second output end of the control unit (108), and the voltage conversion unit (104) is connected between the negative pole of the first battery pack (102) and the second end of the first switch (105) and is used for controlling the closing or opening of the first switch (105) and the second switch (106) based on the output power and a power threshold of the battery circuit. A vehicle including the battery circuit is also disclosed.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to Chinese Patent Application No. 202210614138.5, entitled "BATTERY CIRCUIT AND VEHICLE," filed on May 31, 2022. The entire contents of the above-referenced application are hereby incorporated by reference.

[0002] The present disclosure relates to the technical field of vehicles, and more particularly, to battery circuits and vehicles. [Background technology]

[0003] In the related art, a dual battery pack including a power type battery pack and an energy type battery pack is provided.

[0004] Output power is an important parameter of a battery. How to control the discharge of a dual battery pack including a power type battery pack and an energy type battery pack according to the output power of the battery has become a technical problem that needs to be urgently solved. Summary of the Invention [Problem to be solved by the invention]

[0005] The present disclosure is intended to provide a new technical solution for battery circuits. [Means for solving the problem]

[0006] According to a first aspect of the present disclosure, there is provided a battery circuit including a power terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a voltage conversion unit, a first switch, a second switch, a ground terminal, and a control unit.

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

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

[0009] A first terminal of the first switch is connected to the power supply terminal. A second terminal of the first switch is connected to the first terminal of the second switch. A control terminal of the first switch is connected to the first output terminal of the control unit.

[0010] The second terminal of the second switch is connected to the ground terminal, and the control terminal of the second switch is connected to the second output terminal of the control unit.

[0011] The voltage conversion unit is connected between the negative electrode of the first battery pack and the second terminal of the first switch.

[0012] The control unit is configured to control the first switch and the second switch to be opened or closed according to an output power of the battery circuit and a power threshold of the battery circuit.

[0013] According to an embodiment of the present disclosure, the control unit comprises: When the output power is less than a power threshold, the first switch and the second switch are controlled to be opened or closed according to a preset control rule; The control is configured to control both the first switch and the second switch to be open when the output power is greater than or equal to a power threshold.

[0014] According to one embodiment of the present disclosure, a deviation between a ratio of a capacity of the first battery pack to a capacity of the second battery pack and a ratio of a maximum discharge rate of the second battery pack to a maximum discharge rate of the first battery pack is less than a preset range.

[0015] According to one embodiment of the present disclosure, the ratio of the capacity of the first battery pack to the capacity of the second battery pack is the same as the ratio of the maximum discharge rate of the second battery pack to the maximum discharge rate of the first battery pack.

[0016] According to one embodiment of the present disclosure, the first battery pack is a power type battery pack and 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.

[0017] According to one embodiment of the present disclosure, the control unit includes a subtractor, a control subunit, a pulse width modulation (PWM) signal generating subunit, and an inverter.

[0018] A first input terminal of the subtractor is configured to receive the current value of the first battery pack, a second input terminal of the subtractor is configured to receive the reference current value, and an output terminal of the subtractor is connected to an input terminal of the control subunit.

[0019] A first output terminal of the control subunit is connected to an input terminal of the PWM signal generating subunit.

[0020] A first output terminal of the PWM signal generating sub-unit is connected to the control terminal of the first switch, and a second output terminal of the PWM signal generating sub-unit is connected to the input terminal of the inverter.

[0021] The output terminal of the inverter is connected to the control terminal of the second switch.

[0022] According to an embodiment of the present disclosure, the first battery pack is a power type battery pack and the second battery pack is an energy type battery pack. The battery circuit further includes a filtering unit.

[0023] A first terminal of the filtering unit is connected to the positive electrode of the first battery pack, a second terminal of the filtering unit is connected to the power supply terminal, and a third terminal of the filtering unit is connected to the negative electrode of the first battery pack.

[0024] According to one embodiment of the present disclosure, the filtering unit includes a first inductor and a first capacitor.

[0025] A first terminal of the first inductor is connected to the positive terminal of the first battery pack, and a second terminal of the first inductor is connected to the power supply terminal.

[0026] A first terminal of the first capacitor is connected to the first terminal of the first inductor, and a second terminal of the first capacitor is connected to the negative terminal of the first battery pack.

[0027] According to an embodiment of the present disclosure, the battery circuit further includes a first freewheeling unit and a second freewheeling unit.

[0028] An input terminal of the first freewheeling unit is connected to the second terminal of the first switch. An output terminal of the first freewheeling unit is connected to the first terminal of the first switch.

[0029] The input terminal of the second freewheeling unit is connected to the second terminal of the second switch. The output terminal of the second freewheeling unit is connected to the first terminal of the second switch.

[0030] According to one embodiment of the present disclosure, the first freewheeling unit is a first diode and the second freewheeling unit is a second diode.

[0031] The anode of the first diode is connected to the second terminal of the first switch. The cathode of the first diode is connected to the first terminal of the first switch.

[0032] The anode of the second diode is connected to the second terminal of the second switch. The cathode of the second diode is connected to the first terminal of the second switch.

[0033] According to one embodiment of the present disclosure, the battery circuit further includes a voltage stabilization unit.

[0034] The voltage stabilizing unit is connected between the power supply terminal and the ground terminal.

[0035] According to one embodiment of the present disclosure, the voltage stabilization unit is a second capacitor.

[0036] According to one embodiment of the present disclosure, the voltage conversion unit is a second inductor.

[0037] According to a second aspect of the present disclosure, there is provided a vehicle, the vehicle including the battery circuit of any of the embodiments of the first aspect described above.

[0038] According to a battery circuit according to an embodiment of the present disclosure, the discharge of a dual battery pack including a power type battery pack and an energy type battery pack may be controlled according to the output power of the battery.

[0039] Other features and advantages of the present disclosure will become apparent from the following detailed description of illustrative embodiments thereof, which are provided with reference to the drawings.

[0040] The drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the disclosure. [Brief description of the drawings]

[0041] [Figure 1] FIG. 1 is a schematic structural diagram I of a battery circuit according to an embodiment of the present disclosure. [Diagram 2] FIG. 2 is a schematic structural diagram of a control unit according to an embodiment of the present disclosure. [Diagram 3] FIG. 2 is a schematic structural diagram II of a battery circuit according to an embodiment of the present disclosure. [Figure 4] FIG. 3 is a schematic structural diagram III of a battery circuit according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0042] In the drawing, reference numeral 100 denotes a battery circuit, 101 denotes a power terminal, 102 denotes a first battery pack, and 103 denotes a second battery pack.

[0043] Reference numeral 104 denotes a voltage conversion unit, 1041 denotes a second inductor, 105 denotes a first switch, and 106 denotes a second switch.

[0044] Reference numeral 107 denotes a ground terminal, 108 denotes a control unit, 1081 denotes a subtractor, and 1082 denotes a control sub-unit.

[0045] Reference numeral 1083 denotes a pulse width modulation (PWM) signal generating subunit, 1084 denotes an inverter, and 1085 denotes a switch opening signal generating subunit.

[0046] 109 is a filtering unit, 1091 is a first inductor, and 1092 is a first capacitor.

[0047] 110 is a first freewheeling unit, 1101 is a first diode, and 111 is a second freewheeling unit.

[0048] 1111 is a second diode, 112 is a voltage stabilizing unit, and 1121 is a second capacitor.

[0049] Various exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. Note that the relative arrangements, formulas, and numerical values ​​of components and steps described in the embodiments do not limit the scope of the present disclosure unless otherwise specified.

[0050] The following description of at least one exemplary embodiment is intended to be merely illustrative and is not intended to construe any limitation on the present disclosure and its application or uses.

[0051] Techniques, methods and devices known to those skilled in the art may not be described in detail, but where appropriate, the techniques, methods and devices should be considered part of this specification.

[0052] In the examples shown and described herein, any particular values ​​should be construed as merely illustrative and not limiting, and thus other examples of example embodiments may have different values.

[0053] It should be noted that in the following drawings, like reference numbers and letters represent like items, and therefore, once an item is defined in a drawing, that item need not be further described in subsequent drawings.

[0054] An embodiment of the present disclosure provides a battery circuit 100. As shown in Fig. 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 voltage conversion unit 104, a first switch 105, a second switch 106, a ground terminal 107, and a control unit 108.

[0055] The positive electrode of the first battery pack 102 is connected to the power supply terminal 101. The negative electrode of the first battery pack 102 is connected to the positive electrode of the second battery pack 103.

[0056] The negative terminal of the second battery pack 103 is connected to a ground terminal 107 .

[0057] A first terminal of the first switch 105 is connected to the power supply terminal 101. A second terminal of the first switch 105 is connected to a first terminal of the second switch 106. A control terminal of the first switch 105 is connected to a first output terminal of the control unit 108.

[0058] A second terminal of the second switch 106 is connected to a ground terminal 107. A control terminal of the second switch 106 is connected to a second output terminal of the control unit 108.

[0059] The voltage conversion unit 104 is connected between the negative electrode of the first battery pack 102 and the second terminal of the first switch 105.

[0060] The control unit 108 is configured to control the first switch 105 and the second switch 106 to be opened and closed based on the output power of the battery circuit and the power threshold of the battery circuit.

[0061] In this embodiment of the present disclosure, a battery circuit is provided that includes a power supply terminal, a first battery pack, a second battery pack of a type different from the first battery pack, a voltage conversion unit, a first switch, a second switch, a ground terminal, and a control unit. The positive electrode of the first battery pack is connected to the power supply terminal. The negative electrode of the first battery pack is connected to the positive electrode of the second battery pack. The negative electrode of the second battery pack is connected to the ground terminal. The first terminal of the first switch is connected to the power supply terminal. The second terminal of the first switch is connected to the first terminal of the second switch. The control terminal of the first switch is connected to the first output terminal of the control unit. The second terminal of the second switch is connected to the ground terminal. The control terminal of the second switch is connected to the second output terminal of the control unit. The voltage conversion unit is connected between the negative electrode of the first battery pack and the second terminal of the first switch. The control unit is configured to control the first switch and the second switch to be opened and closed according to the output power of the battery circuit and the power threshold of the battery circuit. According to the battery circuit provided in this embodiment of the present disclosure, the discharge of the dual battery pack including the power type battery pack and the energy type battery pack may be controlled according to the output power of the battery.

[0062] It should be noted that the battery circuit according to the embodiment of the present disclosure is configured to achieve the control of the dual battery pack including the power type battery pack and the energy type battery pack in the discharge state.

[0063] In this embodiment of the present disclosure, when the battery circuit 100 is in a discharging state, the power terminal 101 of the battery circuit 100 is configured to connect to a power input terminal of a load, and the ground terminal 107 of the battery circuit 100 is configured to connect to a ground terminal of the load. Illustratively, the load may be a motor of an electric or hybrid vehicle.

[0064] In one embodiment of the present disclosure, as shown in Figure 4, the voltage conversion unit 104 may be a second inductor 1041. Of course, the voltage conversion unit 104 may be implemented in other ways.

[0065] In an embodiment of the present disclosure, the inductance value of the second inductor 1041 may be set in the range of 2 μH to 1500 μH.

[0066] In this embodiment of the present disclosure, when the voltage transformation unit 104 is the second inductor 1041, the voltage transformation unit 104 has a low cost and a simple structure.

[0067] In one embodiment of the present disclosure, the first switch 105 and the second switch 106 may be switch devices such as a switch IC, a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated-gate bipolar transistor (IGBT), or a silicon carbide (SiC) switch.

[0068] It should be noted that in this embodiment of the present disclosure, the first switch 105 and the second switch 106 are the same type of switch. Specifically, when the control terminals of the first switch and the second switch receive a high level, the first switch 105 and the second switch 106 are both closed or open. When the control terminals of the first switch and the second switch receive a low level, the first switch 105 and the second switch 106 are both open or closed.

[0069] In this embodiment of the present disclosure, the first battery pack 102 and the second battery pack 103 are of different types. 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.

[0070] In this embodiment of the present disclosure, the power battery pack is a battery pack with high power density. Power density is the maximum energy transfer power during charging / discharging of a battery per unit weight or unit volume. In addition, in this embodiment of the present disclosure, the voltage value of the power battery pack may be set in the range of 100V to 1000V.

[0071] The energy type battery pack is a battery pack with high energy density. Energy density is the energy stored in a battery per unit weight or unit volume. In addition, in this embodiment of the present disclosure, the voltage value of the energy type battery pack may be set in the range of 100V to 1000V.

[0072] In this embodiment of the present 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 the embodiment of the present disclosure.

[0073] In this embodiment of the present disclosure, the output power of the battery circuit 100 is the product of the voltage value between the power terminal 101 and the ground terminal 107 of the battery circuit 100 and the current value at the power terminal 101 of the battery circuit 100.

[0074] In one embodiment of the present disclosure, the current value of the power supply terminal 101 of the battery circuit 100 may be detected via an ammeter. The voltage value between the power supply terminal 101 and the ground terminal 107 of the battery circuit 100 may be detected via a voltmeter.

[0075] In this embodiment of the disclosure, the power threshold is the maximum allowable operating power of devices such as the first switch 105, the second switch 106, and the voltage conversion unit 104 of the battery circuit 100. In one example, the power threshold is 50 kW.

[0076] In one embodiment of the present disclosure, the control unit 108 is configured to control the first switch 105 and the second switch 106 to be opened or closed according to the output power of the battery circuit 100 and the power threshold of the battery circuit, which may be specifically implemented as follows:

[0077] When the output power is below the power threshold, the first switch 102 and the second switch 103 are controlled to be opened or closed according to a preset control rule.

[0078] In this embodiment of the present disclosure, the preset control rule is to perform an on / off operation, which includes controlling the first switch 105 to be opened and the second switch 106 to be closed within a first preset period, and controlling the first switch 105 to be closed and the second switch 106 to be opened within a second preset period. The on / off operation is repeated until the first battery pack 102 is open circuited.

[0079] In this embodiment, the second preset period is adjacent to and follows the first preset period. The durations corresponding to the first and second preset periods may be set according to experience or other methods.

[0080] In this embodiment of the present disclosure, when the output power of the battery circuit 100 is less than the power threshold, within a first preset period, the first switch 105 is controlled to be opened and the second switch 106 is controlled to be closed. In this case, the second battery pack 103 charges the voltage conversion unit 104. Within a second preset period, the first switch 105 is controlled to be closed and the second switch 106 is controlled to be opened. In this case, the voltage conversion unit 104 releases the stored power. That is, the voltage conversion unit 104 performs a boost function. This process is repeated. When the voltage of the output terminal (the terminal connected to the first switch 105) of the voltage conversion unit 104 rises to the same voltage as the bus, the first battery pack 102 becomes an open circuit. Based on the above, only the second battery pack 103 is discharged, and the output power during the discharge of the second battery pack 103 is greater than the power that can be output by the second battery pack 103.

[0081] In this embodiment of the present disclosure, a specific implementation is provided in which the control unit 108 controls the first switch 105 and the second switch 106 to be opened or closed according to the output power of the battery circuit 100 and the power threshold of the battery circuit.

[0082] In one embodiment of the present disclosure, the control unit 108 is configured to control the first switch 105 and the second switch 106 to be opened or closed according to the output power of the battery circuit 100 and the power threshold of the battery circuit, which may alternatively be specifically implemented as follows.

[0083] When the output power of the battery circuit 100 is equal to or greater than a power threshold, both the first switch 105 and the second switch 106 are controlled to be open.

[0084] In this embodiment of the present disclosure, when the output power of the battery circuit 100 is equal to or greater than the power threshold, the first switch 105, the second switch 106, and the voltage conversion unit 104 of the battery circuit 100 will be damaged, causing the problem that the battery circuit 100 cannot operate normally. In this case, the first switch 105 and the second switch 106 are both controlled to be opened, so that the first switch 105, the second switch 106, and the voltage conversion unit 104 do not operate. In this way, the problem that the battery circuit 100 cannot operate normally as a result of the first switch 105, the second switch 106, and the voltage conversion unit 104 of the battery circuit 100 being damaged can be avoided. In addition, when the first switch 105 and the second switch 106 are both opened, the first battery pack 102 and the second battery pack 103 are connected in series for discharging.

[0085] In this embodiment of the disclosure, a battery circuit is provided, including a power supply terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a voltage conversion unit, a first switch, a second switch, a ground terminal, and a control unit. A positive electrode of the first battery pack is connected to the power supply terminal. A negative electrode of the first battery pack is connected to the positive electrode of the second battery pack. A negative electrode of the second battery pack is connected to the ground terminal. A first terminal of the first switch is connected to the power supply terminal. A second terminal of the first switch is connected to a first terminal of the second switch. A control terminal of the first switch is connected to a first output terminal of the control unit. A second terminal of the second switch is connected to the ground terminal. A control terminal of the second switch is connected to a second output terminal of the control unit. The voltage conversion unit is connected between the negative electrode of the first battery pack and the second terminal of the first switch. The control unit is configured to control the first switch and the second switch to be opened or closed according to the output power of the battery circuit and the power threshold of the battery circuit. According to the battery circuit provided in this embodiment of the present disclosure, the discharge of the dual battery pack including the power type battery pack and the energy type battery pack may be controlled according to the output power of the battery.

[0086] In this embodiment of the present disclosure, the deviation between the ratio of the capacity Q1 of the first battery pack 102 to the capacity Q2 of the second battery pack 103 and the ratio of the maximum discharge rate X2 of the second battery pack 103 to the maximum discharge rate X1 of the first battery pack 102 is less than a preset range.

[0087] The maximum discharge rate represents the ratio of the maximum discharge current of the battery pack to the battery capacity. For example, if the maximum discharge current of a battery pack having a battery capacity of 10 Ah is 50 A, the maximum discharge rate is 50 A / 10 Ah=5C.

[0088] In this embodiment of the present disclosure, the preset range is an allowable range of deviation between the ratio of the capacity Q1 of the first battery pack 102 to the capacity Q2 of the second battery pack 103 and the ratio of the maximum discharge rate X2 of the second battery pack 103 to the maximum discharge rate X1 of the first battery pack 102. If the deviation between the ratio of the capacity Q1 of the first battery pack 102 to the capacity Q2 of the second battery pack 103 and the ratio of the maximum discharge rate X2 of the second battery pack 103 to the maximum discharge rate X1 of the first battery pack 102 is smaller than the preset range, it indicates that the ratio of the capacity Q1 of the first battery pack 102 to the capacity Q2 of the second battery pack 103 is substantially the same as the ratio of the maximum discharge rate X2 of the second battery pack 103 to the maximum discharge rate X1 of the first battery pack 102.

[0089] In one embodiment of the present disclosure, the preset range may be, for example, ±0.5.

[0090] It should be noted that in this embodiment of the present disclosure, the specific values ​​of the pre-set ranges are not limited.

[0091] In this embodiment of the present disclosure, when the deviation between the ratio of the capacity of the first battery pack 102 to the capacity of the second battery pack 103 and the ratio of the maximum discharge rate of the second battery pack 103 to the maximum discharge rate of the first battery pack 101 is smaller than a second preset range, the maximum discharge currents of the two battery packs can be substantially the same. Based on the above, for example, for stable discharge, the two battery packs may be connected in series.

[0092] It should be noted that in general, the sum of the capacity Q1 of the first battery pack 102 and the capacity Q2 of the second battery pack 103 is equal to the total capacity Qnom required by the load, i.e., Q1+Q2=Qnom.

[0093] In one embodiment of the present disclosure, the ratio between the capacity Q1 of the first battery pack 102 and the capacity Q2 of the second battery pack 103 is the same as the ratio between the maximum discharge rate X2 of the second battery pack 103 and the maximum discharge rate X1 of the first battery pack 102. In this way, the maximum discharge currents of the two battery packs can be made exactly the same.

[0094] Based on the above, in one example, Qnom=120Ah. In this case, Q1=100Ah, Q2=20Ah, X1=1C, and X2=5C may be set.

[0095] In one embodiment of the present disclosure, the control unit 108 can control the first switch 105 and the second switch 106 to be opened and closed according to a preset control rule through a pulse width modulation (PWM) signal. The first switch 105 and the second switch 106 are controlled to be opened and closed according to the PWM signal. The opening time and closing time of the first switch 105 and the second switch 106 are controlled according to the duty cycle of the PWM signal.

[0096] Based on the above, as shown in FIG. 2, the control unit 108 includes: a subtractor 1081, a control subunit 1082, a PWM signal generating subunit 1083, and an inverter 1084.

[0097] A first input terminal of the subtractor 1081 is configured to receive a current value of the first battery pack 102. A second input terminal of the subtractor 1081 is configured to receive a reference current value. An output terminal of the subtractor 1081 is connected to an input terminal of the control subunit 1082.

[0098] A first output terminal of the control sub-unit 1082 is connected to an input terminal of the PWM signal generating sub-unit 1083 .

[0099] A first output terminal of the PWM signal generating subunit 1083 is connected to a control terminal of the first switch 105. A second output terminal of the PWM signal generating subunit 1083 is connected to an input terminal of an inverter 1084.

[0100] The output terminal of the inverter 1084 is connected to the control terminal of the second switch 106 .

[0101] In this embodiment of the present disclosure, the current value of the output current of the first battery pack 102 may be detected through a current value detection unit. After detecting the current value of the output current of the first battery pack 102, the current value detection unit sends the current value to a first input terminal of the subtractor 1081.

[0102] In this embodiment of the present disclosure, the manner in which the subtractor 1081 receives the current value of the first battery pack 102 and the reference current value is not limited.

[0103] In this embodiment of the present disclosure, the control subunit 1082 stores the power threshold value, and the control subunit 108 is configured to obtain the output power of the battery circuit 100. In this embodiment of the present disclosure, the manner in which the control subunit 108 obtains the output power of the battery circuit 100 is not limited.

[0104] In one embodiment of the present disclosure, the control subunit 1082 may illustratively be a microcontroller unit (MCU), a central processing unit (CPU), or the like.

[0105] In this embodiment of the present disclosure, the subtractor 1081 is configured to calculate the difference between the current value of the first battery pack 102 and a reference current value. The reference current value is typically set to 0 since the first battery pack 102 needs to be open circuited.

[0106] The control subunit 1082 is further configured to generate a PWM signal generating command according to the calculation result of the subtractor 1081 when the output power of the battery circuit 100 is less than the power threshold, and output the PWM signal generating command to the PWM signal generating subunit 1083.

[0107] The PWM signal generation sub-unit 1083, under the control of the control sub-unit 1082, is configured to output a PWM signal having an adjustable duty cycle.

[0108] The inverter 1084 is configured to invert the level output by the PWM signal generating sub-unit 1083 .

[0109] It should be noted that in this embodiment of the present disclosure, the subtractor 1081 may periodically receive the current value of the output current of the first battery pack 105. In this way, a closed-loop negative feedback regulation may be achieved, so that the duty cycle of the PWM signal generated by the PWM signal generating sub-unit 1083 may be changed, thereby achieving an open circuit of the first battery pack 102 more quickly and accurately.

[0110] In this embodiment of the present disclosure, a control unit 108 having a simple structure is provided. In this manner, the difficulty of designing the battery circuit provided in the embodiment of the present disclosure may be reduced.

[0111] In one embodiment of the present disclosure, as shown in FIG. 2, the control unit 108 further includes a switch opening signal generating subunit 1085 to control both the first switch 105 and the second switch 106 to be opened.

[0112] A second output terminal of the control subunit 1082 is connected to an input terminal of a switch-opening signal generating subunit 1085 .

[0113] A first output terminal of the switch-opening signal generating sub-unit 1085 is connected to the control terminal of the first switch 105 and the control terminal of the second switch 106, respectively.

[0114] In this embodiment of the present disclosure, the switch opening signal generating subunit 1085 is configured to output a signal for controlling the first switch 105 and the second switch 106 to be opened under the control of the control subunit 1082.

[0115] In one embodiment 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, as shown in FIG. 3, the battery circuit 100 provided in this embodiment of the present disclosure further includes a filtering unit 109.

[0116] A first terminal of the filtering unit 109 is connected to the positive electrode of the first battery pack 102. A second terminal of the filtering unit 109 is connected to the power supply terminal 101. A third terminal of the filtering unit 109 is connected to the negative electrode of the first battery pack 102.

[0117] In this embodiment of the present disclosure, the power battery pack is typically only used when peak power is generated during the running of an electric or hybrid vehicle (e.g., peak discharge power generated during towing and peak charge power generated during braking), so the output current of the power battery pack is expected to be zero in other cases. In these cases, the filtering unit 109 can be arranged to suppress the current ripple of the first battery pack 102 and prevent the output current of the power battery pack (first battery pack 102) from fluctuating around zero. In this way, frequent rapid charging / discharging of the first battery pack 102 can be avoided, thereby reducing the life degradation of the first battery pack 102.

[0118] In one embodiment of the present disclosure, as shown in FIG. 4, the filtering unit 109 includes a first inductor 1091 and a first capacitor 1092.

[0119] A first terminal of the first inductor 1091 is connected to the positive electrode of the first battery pack 102. A second terminal of the first inductor 1091 is connected to the power supply terminal.

[0120] A first terminal of the first capacitor 1092 is connected to the first terminal of the first inductor 1091. A second terminal of the first capacitor 1092 is connected to the negative electrode of the first battery pack 102.

[0121] Of course, filtering unit 109 of another structure may be used, which will not be described in detail in this embodiment of the present disclosure.

[0122] In this embodiment of the disclosure, the first inductor 1091 is a filter inductor and may be configured with a value ranging from 2 μH to 1500 μH. The first capacitor 1092 is a filter capacitor and may be configured with a value ranging from 2 μF to 1500 μF.

[0123] It should be noted that if the first battery pack 102 has a filtering function, the first inductor 1091 and the first capacitor 1092 may be configured with relatively small values. For example, the first inductor 1091 may be configured with a value of 2 μH and the first capacitor 1092 may be configured with a value of 2 μF.

[0124] Correspondingly, if the first battery pack 102 does not have a filtering function, the first inductor 1091 and the first capacitor 1092 may be configured with relatively large values. For example, the first inductor 1091 may be configured with a value of 1500 μH, and the first capacitor 1092 may be configured with a value of 1500 μF.

[0125] In this embodiment of the present disclosure, a filtering unit 109 having a simple structure is provided, which can reduce the hardware cost, the design difficulty, and the footprint of the battery circuit 100.

[0126] In one embodiment of the present disclosure, as shown in FIG. 3, the battery circuit 100 provided in this embodiment of the present disclosure further includes a first freewheeling unit 110 and a second freewheeling unit 111.

[0127] An input terminal of the first freewheeling unit 110 is connected to the second terminal of the first switch 105. An output terminal of the first freewheeling unit 110 is connected to the first terminal of the first switch 105.

[0128] An input terminal of the second freewheeling unit 111 is connected to the second terminal of the second switch 106. An output terminal of the second freewheeling unit 111 is connected to the first terminal of the second switch 106.

[0129] In this embodiment of the present disclosure, at the first moment of closing the second switch 106 and opening the first switch 105, the first switch 105 usually cannot be controlled to be opened immediately as a result of the freewheeling time and actuation time of the first switch 105. As a result, a short circuit occurs between the first switch 105 and the second switch 106 quickly, which causes the first battery pack 102 and the second battery pack 103 to burn out.

[0130] In this embodiment of the present disclosure, the second freewheeling unit 111 is connected in parallel with two terminals of the second switch 106, and the second freewheeling unit 111 performs freewheeling. In this way, the closing time of the second switch 106 may be delayed while controlling the first switch 105 to be opened, thereby preventing the first battery pack 102 and the second battery pack 103 from burning out.

[0131] Similarly, the first freewheeling unit 110 is connected in parallel with two terminals of the first switch 105, and the first freewheeling unit 110 performs freewheeling. In this way, during the control that the second switch 106 is opened, the closing time of the first switch 105 may be delayed, thereby preventing the first battery pack 102 and the second battery pack 103 from burning out.

[0132] In one embodiment of the present disclosure, the first freewheeling unit 110 is a first diode 1101 and the second freewheeling unit 111 is a second diode 1111, as shown in FIG.

[0133] The anode of the first diode 1101 is connected to the second terminal of the first switch 105. The cathode of the first diode 1101 is connected to the first terminal of the first switch 105.

[0134] The anode of the second diode 1111 is connected to the second terminal of the second switch 106. The cathode of the second diode 1111 is connected to the first terminal of the second switch 106.

[0135] In this embodiment of the present disclosure, a first freewheeling unit 110 and a second freewheeling unit 111 having a simple structure are provided, which can reduce the hardware cost, design difficulty, and footprint of the battery circuit 100.

[0136] In one embodiment of the present disclosure, as shown in FIG. 3, the battery circuit 100 provided in this embodiment of the present disclosure further includes a voltage stabilization unit 112.

[0137] The voltage stabilization unit 1121 is connected between the power supply terminal 101 and the ground terminal 107 .

[0138] In this embodiment of the present disclosure, the voltage stabilization unit 112 is configured to filter voltage fluctuations on the bus, i.e., the line on which the power terminal 101 of the battery circuit 100 is located, thereby stabilizing the voltage supplied to the load, and is further configured to reduce the adverse effects of voltage fluctuations jointly generated by the first battery pack 102 and the voltage conversion unit 104 on the second battery pack 103.

[0139] In one embodiment of the present disclosure, as shown in Figure 4, the voltage stabilization unit 112 may exemplarily be a second capacitor 1121. Of course, the voltage stabilization unit 112 may be implemented in other ways.

[0140] In one embodiment of the present disclosure, the second capacitor 1121 is a support capacitor, and the second capacitor 1121 may be configured with a value ranging from 2 μF to 1500 μF.

[0141] In this embodiment of the present disclosure, a voltage stabilization unit 112 having a simple structure is provided, which can reduce the hardware cost, design difficulty, and footprint of the battery circuit 100.

[0142] An embodiment of the present disclosure further provides a vehicle, the vehicle including the battery circuit 100 of any of the previous embodiments.

[0143] In this embodiment of the disclosure, the vehicle is an electric vehicle or a hybrid vehicle.

[0144] The embodiments of the present disclosure have been described above. The above description is illustrative and non-exhaustive, and the present disclosure is not limited to the disclosed embodiments. Many modifications and changes made without departing from the scope and spirit of the various embodiments will be apparent to those skilled in the art. The choice of terms used herein is intended to provide the best explanation of the principles, practical application of the various embodiments, or technical improvements of the technology in the market, or to enable other skilled in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims.

Claims

1. A battery circuit (100) comprising a power supply terminal (101), a first battery pack (102), a second battery pack (103) of a type different from the first battery pack (102), a voltage conversion unit (104), a first switch (105), a second switch (106), a ground terminal (107), and a control unit (108), The positive electrode of the first battery pack (102) is connected to the power supply terminal (101), and the negative electrode of the first battery pack (102) is connected to the positive electrode of the second battery pack (103); The negative electrode of the second battery pack (103) is connected to the ground terminal (107); a first terminal of the first switch (105) is connected to the power supply terminal (101), a second terminal of the first switch (105) is connected to a first terminal of the second switch (106), and a control terminal of the first switch (105) is connected to a first output terminal of the control unit (108); a second terminal of the second switch (106) is connected to the ground terminal (107) and a control terminal of the second switch (106) is connected to a second output terminal of the control unit (108); the voltage conversion unit is connected between the negative electrode of the first battery pack (102) and the second terminal of the first switch (105); the control unit (108) is configured to control the first switch (105) and the second switch (106) to be opened or closed according to an output power of the battery circuit and a power threshold of the battery circuit; Battery circuit (100).

2. The control unit (108) When the output power is less than the power threshold, the first switch (105) and the second switch (106) are controlled to be opened or closed according to a preset control rule; controlling said first switch (105) and said second switch (106) to be both open when said output power is equal to or greater than said power threshold; The battery circuit (100) of claim 1, configured as follows:

3. 3. The battery circuit (100) of claim 1 or 2, wherein a deviation between a ratio of a capacity of the first battery pack (102) to a capacity of the second battery pack (103) and a ratio of a maximum discharge rate of the second battery pack (103) to a maximum discharge rate of the first battery pack (102) is smaller than a preset range.

4. 4. The battery circuit (100) of claim 3, wherein the ratio of the capacity of the first battery pack (102) to the capacity of the second battery pack (103) is the same as the ratio of the maximum discharge rate of the second battery pack (103) to the maximum discharge rate of the first battery pack (102).

5. 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; A battery circuit (100) according to any one of claims 1 to 4.

6. The control unit (108) comprises a subtractor (1081), a control subunit (1082), a pulse width modulation (PWM) signal generating subunit (1083), and an inverter (1084); a first input terminal of the subtractor (1081) configured to receive a current value of the first battery pack (102), a second input terminal of the subtractor (1081) configured to receive a reference current value, and an output terminal of the subtractor (1081) connected to an input terminal of the control sub-unit (1082); A first output terminal of the control sub-unit (1082) is connected to an input terminal of the PWM signal generating sub-unit (1083); a first output terminal of the PWM signal generating subunit (1083) is connected to the control terminal of the first switch (105), and a second output terminal of the PWM signal generating subunit (1083) is connected to an input terminal of the inverter (1084); an output terminal of the inverter (1084) is connected to the control terminal of the second switch (106); A battery circuit (100) according to any one of claims 1 to 5.

7. 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 further comprising a filtering unit (109); a first terminal of the filtering unit (109) is connected to the positive electrode of the first battery pack (102), a second terminal of the filtering unit (109) is connected to the power supply terminal (101), and a third terminal of the filtering unit (109) is connected to the negative electrode of the first battery pack (102); The battery circuit (100) of claim 5.

8. the filtering unit (109) comprises a first inductor (1091) and a first capacitor (1092); A first terminal of the first inductor (1091) is connected to the positive electrode of the first battery pack (102), and a second terminal of the first inductor (1091) is connected to the power supply terminal (101); a first terminal of the first capacitor (1092) is connected to the first terminal of the first inductor (1091), and a second terminal of the first capacitor (1092) is connected to the negative electrode of the first battery pack (102); The battery circuit (100) of claim 7.

9. The vehicle further comprises a first freewheeling unit (110) and a second freewheeling unit (111); an input terminal of the first freewheeling unit (110) is connected to the second terminal of the first switch (105), and an output terminal of the first freewheeling unit (110) is connected to the first terminal of the first switch (105); an input terminal of the second freewheeling unit (111) is connected to the second terminal of the second switch (106), and an output terminal of the second freewheeling unit (111) is connected to the first terminal of the second switch (106); A battery circuit (100) according to any one of the preceding claims.

10. the first freewheeling unit (110) is a first diode (1101), the second freewheeling unit (111) is a second diode (1111), The anode of the first diode (1101) is connected to the second terminal of the first switch (105), and the cathode of the first diode (1101) is connected to the first terminal of the first switch (105); the anode of the second diode (1111) is connected to the second terminal of the second switch (106), and the cathode of the second diode (1111) is connected to the first terminal of the second switch (106); The battery circuit (100) of claim 9.

11. Further comprising a voltage stabilization unit (112), the voltage stabilization unit (112) is connected between the power supply terminal (101) and the ground terminal (107); A battery circuit (100) according to any one of claims 1 to 10.

12. 12. The battery circuit (100) of claim 11, wherein the voltage stabilization unit (112) is a second capacitor (1121).

13. The battery circuit (100) of any one of claims 1 to 12, wherein the voltage conversion unit (104) is a second inductor (1041).

14. A vehicle comprising a battery circuit (100) according to any one of claims 1 to 13.

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