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 transformer unit (104), a first switch (105), a second switch (106), and a ground terminal (107), in which the positive pole of the first battery pack (102) is connected to the power supply terminal (101), the negative pole of the first battery pack (102) is connected to the positive pole of the second battery pack (103), and the negative pole of the second battery pack (103) is connected to the ground terminal (107), a first end of the first switch (105) is connected to the power supply terminal (101), a second end of the first switch (105) is connected to a first end of the second switch (106), and the second switch (106) is connected to a ground terminal (107). a second end of the first switch (106) connected to a ground end (107), the transformer unit (104) connected between the negative pole of the first battery pack (102) and the second end of the first switch (105), a deviation between a rated voltage of the first battery pack (102) and a rated voltage of the second battery pack (103) is less than a first preset range, and 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 less than a second preset range. A vehicle including the battery circuit is also disclosed.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This disclosure claims priority to National Patent Application No. 202210614132.8, entitled “BATTERY CIRCUIT AND VEHICLE”, filed May 31, 2022. The entire contents of the above application are incorporated herein 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 prior art, a dual battery pack is provided which is composed of a power type battery pack and an energy type battery pack.

[0004] How to provide a hardware basis for controlling a dual battery pack consisting of a power type battery pack and an energy type battery pack has become an urgent technical problem to be solved. Summary of the Invention [Means for solving the problem]

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

[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 transformer unit, a first switch, a second switch, and a ground terminal.

[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, and a second terminal of the first switch is connected to the first terminal of the second switch.

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

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

[0012] The deviation between the rated voltage of the first battery pack and the rated voltage of the second battery pack is less than a first preset range; and / or A deviation between a ratio of the capacity of the first battery pack to the 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 second preset range.

[0013] According to one embodiment of the present disclosure, the rated voltage of the first battery pack is the same as the rated voltage of the second battery pack; and / or 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.

[0014] According to one embodiment of the present disclosure, the battery circuit comprises: The switch further includes a control unit, the first terminal of the control unit being connected to the control terminal of the first switch, and the second terminal of the control unit being connected to the control terminal of the second switch.

[0015] The control unit controls the first switch and the second switch to open and close according to a first preset control rule under a first preset condition to increase the output power of the second battery pack; and / or Controlling the first switch and the second switch to open and close according to a second preset control rule under a second preset condition such that an input power of the first battery pack is different from an input power of the second battery pack; and / or Controlling the first switch and the second switch to open and close according to a third preset control rule under a third preset condition to cause the first battery pack to charge the second battery pack or to cause the second battery pack to charge the first battery pack; and / or and controlling the first switch and the second switch to open under a fourth preset condition to connect the first battery pack and the second battery pack in series for discharging or charging.

[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 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.

[0018] 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.

[0019] According to an embodiment of the present disclosure, the filtering unit includes a first inductor and a first capacitor.

[0020] A first terminal of the first inductor is connected to the positive electrode of the first battery pack, and a second terminal of the first inductor is connected to the power supply terminal.

[0021] 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 electrode of the first battery pack.

[0022] According to one embodiment of the present disclosure, the battery circuit further includes a first freewheeling unit and a second freewheeling unit.

[0023] The input terminal of the first freewheeling unit is connected to the second terminal of the first switch, and the output terminal of the first freewheeling unit is connected to the first terminal of the first switch.

[0024] The input terminal of the second freewheeling unit is connected to the second terminal of the second switch, and the output terminal of the second freewheeling unit is connected to the first terminal of the second switch.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] According to one embodiment of the present disclosure, the battery circuit further includes a voltage stabilization unit.

[0029] The voltage stabilizing unit is connected between the power supply terminal and the ground terminal.

[0030] According to one embodiment of the present disclosure, the voltage stabilization unit is a second capacitor.

[0031] According to one embodiment of the present disclosure, the transformer unit is a second inductor.

[0032] According to a second aspect of the present disclosure, there is provided a vehicle, the vehicle including the battery circuit according to any of the implementations of the first aspect described above.

[0033] According to a battery circuit in one embodiment of the present disclosure, a hardware circuit board is provided for controlling a dual battery pack consisting of a first battery pack and a second battery pack.

[0034] Other features and advantages of the present disclosure will become apparent from the following detailed description of illustrative embodiments of the present disclosure, which are provided with reference to the drawings. [Brief description of the drawings]

[0035] 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. [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 II of a battery circuit according to an embodiment of the present disclosure. [Diagram 3] FIG. 3 is a schematic structural diagram III of a battery circuit according to an embodiment of the present disclosure. [Figure 4] FIG. IV is a schematic structural diagram of a battery circuit according to an embodiment of the present disclosure. [Explanation of symbols]

[0036] 100 battery circuit 101 Power terminal 102 First battery pack 103 Second Battery Pack 104 Transformer Unit 1041 Second Inductor 105 First Switch 106 Second Switch 107 Ground terminal 108 Control Unit 109 Filtering Unit 1091 First Inductor 1092 First Capacitor 110 First freewheeling unit 1101 First Diode 111 Second freewheeling unit 1111 Second Diode 112 Voltage Stabilizer Unit 1121 Second Capacitor DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0037] Various exemplary embodiments of the present disclosure will be described with reference to the drawings. It should be noted that unless otherwise specified, the relative arrangements, formulas, and numerical values ​​of the components and steps described in the embodiments do not limit the scope of the present disclosure.

[0038] 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 disclosure and its application or uses.

[0039] Techniques, methods and devices that are known to those skilled in the art will not be discussed in detail, but where appropriate, the techniques, methods and devices should be considered part of this specification.

[0040] Any particular values ​​in the examples shown and discussed herein should be construed as merely illustrative and not limiting, and thus other examples of example embodiments may have different values.

[0041] It should be noted that like reference numbers and letters represent like items in the following drawings, so that once an item is defined in a drawing, that item need not be further discussed in subsequent drawings.

[0042] One 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 transformer unit 104, a first switch 105, a second switch 106, and a ground terminal 107.

[0043] 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.

[0044] The negative terminal of the second battery pack 103 is connected to a ground terminal 107 .

[0045] 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 .

[0046] The second terminal of the second switch 106 is connected to the ground terminal 107 .

[0047] The transformer unit 104 is connected between the negative terminal of the first battery pack 102 and a second terminal of the first switch 105 .

[0048] The deviation between the rated voltage of the first battery pack 102 and the rated voltage of the second battery pack 103 is less than a first preset range, and / or 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 102 is less than a second preset threshold.

[0049] In this embodiment of the present 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 transformer unit, a first switch, a second switch, and a ground terminal. 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 the first terminal of the second switch. A second terminal of the second switch is connected to the ground terminal. A transformer unit is connected between the negative electrode of the first battery pack and the second terminal of the first switch. A deviation between a rated voltage of the first battery pack and a rated voltage of the second battery pack is less than a first preset range. A deviation between a ratio of the capacity of the first battery pack to the capacity of the second battery pack and a ratio of the maximum discharge rate of the second battery pack to the maximum discharge rate of the first battery pack is less than a second preset range. According to a battery circuit provided in an embodiment of the present disclosure, a hardware circuit board for controlling a dual battery pack consisting of a first battery pack and a second battery pack is provided.

[0050] In this embodiment of the present disclosure, when the battery circuit 100 is in a discharged state, the power terminal 101 in the battery circuit 100 is configured to connect to a power input terminal of a load, and the ground terminal 107 in 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.

[0051] 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 a power output terminal of a charging device, and the ground terminal 107 in the battery circuit 100 is configured to connect to a ground terminal of the charging device. Illustratively, the charging device may be a charging pile or a braking system of an electric or hybrid vehicle.

[0052] In one embodiment of the present disclosure, as shown in Fig. 4, the transformer unit 104 may be a second inductor 1041. Of course, the transformer unit 104 may be implemented in other ways.

[0053] In one 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.

[0054] In this embodiment of the present disclosure, when the transformer unit 104 is the second inductor 1041, the transformer unit 104 has a low cost and a simple structure.

[0055] In one embodiment of the present disclosure, the first switch 105 and the second switch 106 may be a switch IC, a metal oxide semiconductor field effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), a silicon carbide (SiC) switch, or the like.

[0056] It should be appreciated that the first switch 105 further includes a control terminal configured to control the first switch 105 to open or close. Similarly, the second switch 106 further includes a control terminal configured to control the second switch 106 to open or close.

[0057] 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.

[0058] 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 or discharging of a battery having a unit weight or unit volume. In addition, in this embodiment of the present disclosure, the voltage value of the power battery pack can be set in the range of 100V to 1000V.

[0059] The energy type battery pack is a battery pack having a high energy density. The energy density is the energy stored in a battery having a unit weight or a unit volume. In addition, in this embodiment of the present disclosure, the voltage value of the energy type battery pack can be set in the range of 100V to 1000V.

[0060] 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.

[0061] In this embodiment of the present disclosure, the deviation between the rated voltage U1 of the first battery pack 102 and the rated voltage U2 of the second battery pack 103 is less than a first preset range.

[0062] In this embodiment of the present disclosure, the first preset range is an acceptable range of deviation between the rated voltage U1 of the first battery pack 102 and the rated voltage U3 of the second battery pack 103. If the deviation between the rated voltage U1 of the first battery pack 102 and the rated voltage U2 of the second battery pack 103 is smaller than the first preset range, this indicates that the rated voltage U1 of the first battery pack 102 is substantially the same as the rated voltage U2 of the second battery pack 103.

[0063] In one embodiment of the present disclosure, the first preset range may be exemplarily 0.2*U1 or 0.2*U2. If the first preset range is 0.2*U1, 1.2*U1≧U2≧0.8*U1. If the first preset range is 0.2*U2, 1.2*U2≧U1≧0.8*U2.

[0064] It should be noted that the specific value of the first preset range is not limited in this embodiment of the present disclosure.

[0065] In this embodiment of the present disclosure, when the deviation between the rated voltage U1 of the first battery pack 102 and the rated voltage U2 of the second battery pack 103 is smaller than a first preset range, efficient energy transfer can be achieved between the first battery pack 102 and the second battery pack 103. For example, efficient mutual charging can be achieved between the first battery pack 102 and the second battery pack 103.

[0066] It should be noted that in general, the sum of the rated voltage U1 of the first battery pack 102 and the rated voltage U1 of the second battery pack 103 is equal to the total voltage Uout required by the load, i.e. U1+U2=Uout.

[0067] In one embodiment of the present disclosure, the rated voltage U1 of the first battery pack 102 is the same as the rated voltage U2 of the second battery pack 103. In this way, the most efficient energy transfer between the first battery pack 102 and the second battery pack 103 can be achieved.

[0068] Based on the above, in one example, Uout=550V. In this case, U1=U2=275V can be set.

[0069] 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 second preset range.

[0070] 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.

[0071] In this embodiment of the present disclosure, the second 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 second preset range, this 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.

[0072] In one embodiment of the present disclosure, the second preset range may illustratively be ±0.5.

[0073] It should be noted that the specific value of the second preset range is not limited in this embodiment of the present disclosure.

[0074] 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 stable discharge, the two battery packs can be connected in series.

[0075] 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, ie, Q1+Q2=Qnom.

[0076] In one embodiment of the present disclosure, the ratio of the capacity Q1 of the first battery pack 102 to the capacity Q2 of the second battery pack 103 is 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. In this way, the maximum discharge currents of the two battery packs can be made exactly the same.

[0077] Based on the above, in one example, Qnom=120Ah. In this case, Q1=100Ah, Q2=20Ah, X1=1C, and X2=5C may be set.

[0078] The battery circuit 100 shown in Fig. 1 provided in the embodiment of the present disclosure provides a hardware basis for controlling a dual battery pack composed of a power type battery pack and an energy type battery pack. Specifically, according to the battery circuit shown in Fig. 1, the dual battery pack composed of a power type battery pack and an energy type battery pack can be controlled as follows.

[0079] To achieve the control of the first switch 105 and the second switch 106, the battery circuit 100 further includes a control unit 108, as shown in FIG.

[0080] A first terminal of the control unit 108 is connected to a control terminal of the first switch 105. A second terminal of the control unit 108 is connected to a control terminal of the second switch 106.

[0081] In one embodiment of the present disclosure, the control unit 108 may exemplarily be a central processing unit (CPU), a microcontroller unit (MCU), or the like.

[0082] The control unit 108 is configured to control the first switch 105 and the second switch 106 to open and close according to a first preset control rule under a first preset condition to increase the output power of the second battery pack 103.

[0083] 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, which includes controlling the first switch 105 to open and the second switch 106 to close within a first preset period, and controlling the first switch 105 to close and the second switch 106 to open within a second preset period. The first on / off operation is repeated until the first battery pack 102 is in an open circuit state.

[0084] In this embodiment, the second preset period is adjacent to and follows the first preset period. The periods corresponding to the first preset period and the second preset period may be set according to experience or other methods.

[0085] In this embodiment, when the battery circuit 100 is in a discharging state, the first switch 105 is controlled to open and the second switch 106 is controlled to close within a first preset period. In this case, the second battery pack 103 charges the transformer unit 104. In a second preset 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 releases the stored power. In other words, the voltage at the output terminal (the terminal connected to the first switch 105) of the transformer unit 104 rises. This process is repeated. When the voltage at the output terminal of the transformer unit 104 rises to the same voltage as the bus, the first battery pack 102 is in an open circuit state. In this way, only the second battery pack 103 is discharged, and the power output by the second battery pack 103 is greater than the power output by the second battery pack 103. In other words, the output power of the second battery pack 103 increases.

[0086] The control unit 108 is further configured to control the first switch 105 and the second switch 106 to open and close according to a second preset control rule under a second preset condition such that the input power of the first battery pack 102 is different from the input power of the second battery pack 103.

[0087] In this embodiment, the second preset condition may be that the battery circuit 100 is in a charging state. The second preset control rule may be to perform a second on / off operation, which includes controlling the first switch 105 to close and the second switch 106 to open within a third preset period, and controlling the first switch 105 to open and the second switch 106 to close within a fourth preset period. The second on / off operation is repeated.

[0088] In this embodiment, the fourth preset period is adjacent to and follows the third preset period. The periods corresponding to the third preset period and the fourth preset period may be set according to experience or other methods.

[0089] In this embodiment, when the battery circuit 100 is in a charging state, the first switch 105 is controlled to close and the second switch 106 is controlled to open within a third preset period. In this case, the first battery pack 102 and / or the charging device charge the transformer unit 104. In a fourth preset 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 releases the stored power to charge the second battery pack 103 together with the charging device. In other words, the transformer unit 104 implements a boost function. Since the first battery pack 102 is charged only by the charging device, the input power of the second battery pack 103 can be made larger than the input power of the first battery pack 102 by repeating this process while the second battery pack 103 is charged together by the transformer unit 104 and the same charging device. In other words, the input power of the second battery pack 103 is different from the input power of the first battery pack 102 .

[0090] It should be understood that if the second preset control rule is an opposite control rule to repeating the second on / off operation, then within a third preset period, the first switch 105 is controlled to open and the second switch 106 is controlled to close, and within a fourth preset period, the first switch 105 is controlled to close and the second switch 106 is controlled to open. This operation is repeated. In this way, 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.

[0091] The control unit 108 is further configured to control the first switch 105 and the second switch 106 to open and close according to a third preset control rule under a third preset condition, so as to cause the first battery pack 102 to charge the second battery pack 103 or to cause the second battery pack 103 to charge the first battery pack 102.

[0092] In this embodiment, the third preset condition may be that the charging current of the second battery pack 103 is smaller than the maximum charging current of the second battery pack 103. Correspondingly, the third preset control rule may be to perform a third on / off operation, which includes controlling the first switch 105 to close and the second switch 106 to open within a fifth preset period, and controlling the first switch 105 to open and the second switch 106 to close within a sixth preset period. The third on / off operation is repeated.

[0093] In this embodiment, the sixth preset period is adjacent to and follows the fifth preset period. The periods corresponding to the fifth preset period and the sixth preset period may be set according to experience or other methods.

[0094] In this embodiment, if the charging current of the second battery pack 103 is smaller than the maximum charging current of the second battery pack 103, within a fifth preset 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. Within a sixth preset 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 releases the stored power to the second battery pack 103. In other words, the transformer unit 104 implements a boost function. This process is repeated so that the first battery pack 102 can charge the second battery pack 103.

[0095] It should be understood that if the third preset condition is that the charging current of the first battery pack 102 is smaller than the maximum charging current of the first battery pack 102, then the third preset control rule is a control rule opposite to repeating the third on / off operation. Specifically, within the fifth preset period, the first switch 105 is controlled to open, and the second switch 106 is controlled to close, and within the sixth preset period, the first switch 105 is controlled to close, and the second switch 106 is controlled to open. This operation is repeated. In this way, the second battery pack 103 can charge the first battery pack 102.

[0096] The control unit 108 is further configured to control the first switch 105 and the second switch 106 to open under a fourth preset condition to connect the first battery pack 102 and the second battery pack 103 in series for discharging or charging.

[0097] In this embodiment, the fourth preset condition is that the battery circuit 100 is in a discharging state or a charging state. The first switch 105 and the second switch 106 are controlled to open under the fourth preset condition. In this way, the first battery pack 102 and the second battery pack 103 are discharged or charged together.

[0098] Based on the above, embodiments of the present disclosure provide multiple types of control according to the battery circuit shown in FIG.

[0099] In this embodiment of the present 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 transformer unit, a first switch, a second switch, and a ground terminal. 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 the first terminal of the second switch. A second terminal of the second switch is connected to the ground terminal. A transformer unit is connected between the negative electrode of the first battery pack and the second terminal of the first switch. A deviation between a rated voltage of the first battery pack and a rated voltage of the second battery pack is less than a first preset range. A deviation between a ratio of the capacity of the first battery pack to the capacity of the second battery pack and a ratio of the maximum discharge rate of the second battery pack to the maximum discharge rate of the first battery pack is less than a second preset range. According to a battery circuit provided in an embodiment of the present disclosure, a hardware circuit board for controlling a dual battery pack consisting of a first battery pack and a second battery pack is provided.

[0100] 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.

[0101] 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.

[0102] In this embodiment of the present disclosure, the power battery pack is usually only used when peak power (peak discharge power generated during towing and peak charge power generated during braking) is generated during the movement of the electric or hybrid vehicle, so that 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 to prevent the output current of the power battery pack (first battery pack 102) from fluctuating around zero. In this way, high frequency fast charging / discharging of the first battery pack 102 can be avoided, thereby suppressing the life degradation of the first battery pack 102.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] Of course, other structures of the filtering unit 109 may also be used, which are not described in detail in this embodiment of the present disclosure.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] In this embodiment of the present disclosure, a filtering unit 109 having a simple structure is provided, which can reduce the hardware cost, design difficulty, and footprint of the battery circuit 100.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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 open immediately due to the freewheeling time and operating time of the first switch 105. As a result, a short circuit will occur between the first switch 105 and the second switch 106 immediately, causing the first battery pack 102 and the second battery pack 103 to burn out.

[0115] In this embodiment of the present disclosure, the second freewheeling unit 111 is connected in parallel with the 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 can be delayed during the control of opening the first switch 105, thereby preventing the first battery pack 102 and the second battery pack 103 from being burned due to a short circuit.

[0116] Similarly, in this embodiment of the present disclosure, 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, the closing time of the first switch 105 can be delayed during the control to open the second switch 106, thereby preventing the first battery pack 102 and the second battery pack 103 from being burned due to a short circuit.

[0117] In one embodiment of the present disclosure, the first freewheeling unit 109 is a first diode 1101 and the second freewheeling unit 111 is a second diode 1111, as shown in FIG.

[0118] 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.

[0119] 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.

[0120] In this embodiment of the present disclosure, a first freewheeling unit 110 and a second freewheeling unit 111 are provided with a simple structure, which can reduce the hardware cost, design difficulty, and footprint of the battery circuit 100.

[0121] 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.

[0122] The voltage stabilization unit 112 is connected between the power supply terminal 101 and the ground terminal 107 .

[0123] In this embodiment of the disclosure, the voltage stabilization unit 111 is configured to remove 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 on the second battery pack 103 of voltage fluctuations generated together by the first battery pack 102 and the transformer unit 104.

[0124] In an embodiment of the present disclosure, as shown in Figure 4, the voltage stabilization unit 112 may illustratively be a second capacitor 1121. Of course, the voltage stabilization unit 112 may be implemented in other ways.

[0125] 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.

[0126] 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.

[0127] An embodiment of the present disclosure further provides a vehicle, the vehicle including the battery circuit 100 of any of the previous embodiments.

[0128] In this embodiment of the disclosure, the vehicle is an electric or hybrid vehicle.

[0129] 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 various embodiments will be apparent to those skilled in the art. Various terms used in this specification are intended to best explain the principles of the embodiments, the practical applications of the various embodiments, or the technical improvements of the technology in the market, or to allow those 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 that of the first battery pack (102), a transformer unit (104), a first switch (105), a second switch (106), and a ground terminal (107), 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), and a second terminal of the first switch (105) is connected to a first terminal of the second switch (106); A second terminal of the second switch (106) is connected to the ground terminal (107); the transformer unit (104) is connected between the negative electrode of the first battery pack (102) and the second terminal of the first switch (105); the deviation between the rated voltage of the first battery pack (102) and the rated voltage of the second battery pack (103) is less than a first preset range; and / or a deviation between a ratio of the 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 less than a second preset range.

2. the rated voltage of the first battery pack (102) is the same as the rated voltage of the second battery pack (103); and / or 2. The battery circuit (100) of claim 1, 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).

3. A control unit (108) has a first terminal connected to a control terminal of the first switch (105) and a second terminal connected to a control terminal of the second switch (106). Further equipped with The control unit (108) Controlling the first switch (105) and the second switch (106) to open and close according to a first preset control rule under a first preset condition to increase the output power of the second battery pack (103); and / or Controlling the first switch (105) and the second switch (106) to open and close according to a second preset control rule under a second preset condition such that an input power of the first battery pack (102) is different from an input power of the second battery pack (103); and / or Controlling the first switch (105) and the second switch (106) to open or close according to a third preset control rule under a third preset condition, so as to cause the first battery pack (102) to charge the second battery pack (103) or to cause the second battery pack (103) to charge the first battery pack (102); and / or controlling the first switch (105) and the second switch (106) to open under a fourth preset condition in order to connect the first battery pack (102) and the second battery pack (103) in series for discharging or charging; The battery circuit (100) of claim 1 or 2, configured as follows:

4. 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 battery circuit (100) of any one of claims 1 to 3, wherein the first battery pack (102) is an energy type battery pack and the second battery pack (103) is a power type battery pack.

5. The first battery pack (102) is a power type battery pack and the second battery pack (103) is an energy type battery pack, and the battery circuit (100) further comprises a filtering unit (109); 5. The battery circuit (100) of claim 4, wherein 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).

6. 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); 6. The battery circuit (100) of claim 5, wherein 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 terminal of the first battery pack (102).

7. Further comprising 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); 7. The battery circuit (100) of claim 1, wherein 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).

8. 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 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); 8. The battery circuit (100) of claim 7, wherein an anode of the second diode (1111) is connected to the second terminal of the second switch (106) and a cathode of the second diode (1111) is connected to the first terminal of the second switch (106).

9. Further comprising a voltage stabilization unit (112), 9. The battery circuit (100) of claim 1, wherein the voltage stabilization unit (112) is connected between the power supply terminal (101) and the ground terminal (107).

10. 10. The battery circuit (100) of claim 9, wherein the voltage stabilization unit (112) is a second capacitor (1121).

11. The battery circuit (100) according to any one of claims 1 to 10, wherein the transformer unit (104) is a second inductor (1041).

12. A vehicle comprising a battery circuit (100) according to any one of claims 1 to 11.

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