Battery circuit and vehicle

Abstract

The present application discloses a battery circuit and a vehicle, and relates to the field of vehicle technology. The battery circuit includes: 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, wherein: 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 end of the first switch is connected to the power supply terminal, the second end of the first switch is connected to the first end of the second switch; the second end of the second switch is connected to the ground terminal; the transformer unit is connected between the negative electrode of the first battery pack and the second end of the first switch. The battery circuit can achieve: providing a hardware circuit basis for controlling a dual battery pack consisting of a first battery pack and a second battery pack.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more particularly, to a battery circuit and a vehicle. Background Art

[0002] With technological advancements, electric vehicles are gradually replacing fuel-powered vehicles. Batteries, the core of electric vehicles, typically consist of a single type of battery pack. This means that existing batteries have fixed energy and power densities. However, electric vehicles require different energy and power densities in different driving scenarios. Therefore, to meet these varying energy and power density requirements, a dual battery pack consisting of a power-specific battery pack and an energy-specific battery pack has been proposed.

[0003] However, how to provide a hardware foundation for controlling a dual battery pack consisting of a power-type battery pack and an energy-type battery pack has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] One object of the present application is to provide a new technical solution for battery circuits.

[0005] According to a first aspect of the present application, a battery circuit is provided, comprising: 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, and a ground terminal, wherein:

[0006] The positive electrode of the first battery pack is connected to the power supply terminal, and the negative electrode of the first battery pack is connected to the positive electrode of the second battery pack;

[0007] The negative electrode of the second battery pack is connected to the ground terminal;

[0008] A first end of the first switch is connected to the power supply end, and a second end of the first switch is connected to a first end of the second switch;

[0009] The second end of the second switch is connected to the ground end;

[0010] The voltage transformation unit is connected between the negative electrode of the first battery pack and the second end of the first switch.

[0011] Optionally, a control unit, wherein a first end of the control unit is connected to the control end of the first switch, and a second end of the control unit is connected to the control end of the second switch;

[0012] The control unit is configured to control the first switch and the second switch to be opened or closed according to a first preset control rule under a first preset condition, so as to increase the output power of the second battery pack;

[0013] and / or, under a second preset condition, controlling the first switch and the second switch to be opened or closed according to a second preset control rule, so that the input power of the first battery pack is different from that of the second battery pack;

[0014] and / or, under a third preset condition, controlling the first switch and the second switch to be opened or closed according to a third preset control rule, so that the first battery pack charges the second battery pack, or the second battery pack charges the first battery pack;

[0015] And / or, under a fourth preset condition, the first switch and the second switch are controlled to be disconnected, so that the first battery pack and the second battery pack are discharged or charged in series.

[0016] Optionally, the first battery pack is a power type battery pack, and the second battery pack is an energy type battery pack;

[0017] Alternatively, the first battery pack is the energy-type battery pack, and the second battery pack is a power-type battery pack.

[0018] Optionally, the first battery pack is a power type battery pack, the second battery pack is an energy type battery pack, and the battery circuit further includes: a filtering unit, wherein:

[0019] The first end of the filter unit is connected to the positive electrode of the first battery pack, the second end of the filter unit is connected to the power supply end, and the third end of the filter unit is connected to the negative electrode of the first battery pack.

[0020] Optionally, the filtering unit includes a first inductor and a first capacitor, wherein:

[0021] A first end of the first inductor is connected to the positive electrode of the first battery pack, and a second end of the first inductor is connected to the power supply terminal;

[0022] The first end of the first capacitor is connected to the first end of the first inductor, and the second end of the first capacitor is connected to the negative electrode of the first battery pack.

[0023] Optionally, the battery circuit further includes a first freewheeling unit and a second freewheeling unit, wherein:

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

[0025] An input end of the second freewheeling unit is connected to the second end of the second switch, and an output end of the second freewheeling unit is connected to the first end of the second switch.

[0026] Optionally, the first freewheeling unit is a first diode, and the second freewheeling unit is a second diode, wherein:

[0027] An anode of the first diode is connected to the second end of the first switch, and a cathode of the first diode is connected to the first end of the first switch;

[0028] An anode of the second diode is connected to the second end of the second switch; and a cathode of the second diode is connected to the first end of the second switch.

[0029] Optionally, the battery circuit further includes a voltage stabilization unit, wherein:

[0030] The voltage stabilizing unit is connected between the power supply terminal and the ground terminal.

[0031] Optionally, the voltage stabilizing unit is a second capacitor.

[0032] Optionally, the voltage transformation unit is a second inductor.

[0033] According to a second aspect of the present application, a vehicle is provided, comprising a battery circuit as described in any one of the first aspects above.

[0034] In an embodiment of the present application, a battery circuit is provided, comprising: 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, and a ground terminal, wherein: 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 second terminal of the second switch is connected to the ground terminal; and the voltage conversion unit is connected between the negative electrode of the first battery pack and the second terminal of the first switch. Thus, the battery circuit provided in an embodiment of the present application can achieve: providing a hardware circuit foundation for controlling a dual battery pack consisting of the first battery pack and the second battery pack.

[0035] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0037] Figure 1 This is a schematic diagram of the structure of a battery circuit provided in an embodiment of the present application. Figure 1 ;

[0038] Figure 2This is a schematic diagram of the structure of a battery circuit provided in an embodiment of the present application. Figure 2 ;

[0039] Figure 3 This is a schematic diagram of the structure of a battery circuit provided in an embodiment of the present application. Figure 3 ;

[0040] Figure 4 This is a schematic diagram of the structure of a battery circuit provided in an embodiment of the present application. Figure 4 ;

[0041] Reference numerals:

[0042] 100 - battery circuit; 101 - power supply terminal; 102 - first battery pack; 103 - second battery pack;

[0043] 104 - transformer unit; 1041 - second inductor; 105 - first switch;

[0044] 106 - second switch; 107 - ground terminal; 108 - control unit;

[0045] 109 - filtering unit; 1091 - first inductor; 1092 - first capacitor;

[0046] 110-first freewheeling unit; 1101-first diode;

[0047] 111-second freewheeling unit; 1111-second diode;

[0048] 112 - voltage stabilization unit; 1121 - second capacitor. DETAILED DESCRIPTION

[0049] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0050] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0051] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0052] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0053] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0054] The embodiment of the present application provides a battery circuit 100, such as Figure 1 As shown, the battery circuit 100 includes: a power supply terminal 101, a first battery pack 102, a second battery pack 103 of a different type from the first battery pack 102, a voltage conversion unit 104, a first switch 105, a second switch 106, and a ground terminal 107, wherein:

[0055] 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;

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

[0057] A first end of the first switch 105 is connected to the power supply terminal 101 , and a second end of the first switch 105 is connected to a first end of the second switch 106 ;

[0058] The second end of the second switch 106 is connected to the ground end 107;

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

[0060] In an embodiment of the present application, a battery circuit is provided, comprising: 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, and a ground terminal, wherein: 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 second terminal of the second switch is connected to the ground terminal; and the voltage conversion unit is connected between the negative electrode of the first battery pack and the second terminal of the first switch. Thus, the battery circuit provided in an embodiment of the present application can achieve: providing a hardware circuit foundation for controlling a dual battery pack consisting of the first battery pack and the second battery pack.

[0061] In the embodiment of the present application, when the battery circuit 100 is in a discharging state, the power terminal 101 of the battery circuit 100 is used to connect to the power input terminal of the load, and the ground terminal 107 of the battery circuit 100 is used to connect to the ground terminal of the load. The load can be exemplarily a motor of an electric vehicle or a hybrid vehicle.

[0062] Alternatively, when the battery circuit 100 is in a charging state, the power terminal 101 in the battery circuit 100 is used to connect to the power output terminal of a charging device, and the ground terminal 107 in the battery circuit 100 is used to connect to the ground terminal of the charging device. The charging device may be, for example, a charging station, or a braking system of an electric vehicle or hybrid vehicle.

[0063] In one embodiment of the present application, Figure 4 As shown, the voltage transformation unit 104 may be a second inductor 1041. Of course, the voltage transformation unit 104 may also be implemented in other ways.

[0064] In one embodiment of the present application, the inductance value of the second inductor 1041 may be set within a range of 2 to 1500 uH.

[0065] In the embodiment of the present application, when the voltage transformation unit 104 is the second inductor 1041 , the voltage transformation unit 104 has low cost and simple structure.

[0066] In one embodiment of the present application, the first switch 105 and the second switch 106 can be a switch IC, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor) or a SiC (Silicon Carbide) switch, etc.

[0067] It is understandable that the first switch 105 further includes a control terminal to control the on and off of the first switch 105. Similarly, the second switch 106 also includes a control terminal to control the on and off of the second switch 106.

[0068] In the embodiment of the present application, 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.

[0069] In this embodiment of the present application, a power-type battery pack is designated as a battery pack with high power density. Power density is defined as the maximum power per unit weight or volume of the battery during charging or discharging. Furthermore, in this embodiment of the present application, the voltage of a power-type battery pack can be set within the range of 100 to 1000V.

[0070] Energy-type battery packs have high energy density. Energy density refers to the amount of energy stored per unit weight or volume of a battery. In the embodiments of this application, the voltage of the energy-type battery pack can be set within a range of 100 to 1000V.

[0071] In the embodiment of the present application, there is no limitation on the specific types of the first battery pack 102 and the second battery pack 103 , which can improve the compatibility of the battery circuit 100 provided in the embodiment of the present application.

[0072] The embodiments of this application provide Figure 1 The battery circuit 100 shown provides a hardware foundation for controlling a dual battery pack consisting of a power battery pack and an energy battery pack. Figure 1 The battery circuit shown can control a dual battery pack consisting of a power battery pack and an energy battery pack according to the following contents.

[0073] To realize the control of the first switch 105 and the second switch 106, as shown in FIG. Figure 2 As shown, the battery circuit 100 further includes a control unit 108.

[0074] A first terminal of the control unit 108 is connected to the control terminal of the first switch 105 , and a second terminal of the control unit 108 is connected to the control terminal of the second switch 106 .

[0075] In one embodiment of the present application, the control unit 108 may be exemplarily a CPU or an MCU.

[0076] Furthermore, the control unit 108 is configured to control the first switch 105 and the second switch 106 to be opened or closed according to a first preset control rule under a first preset condition, so that the output power of the second battery pack 103 is increased.

[0077] In this embodiment, the first preset condition may be that the battery circuit 100 is in a discharging state. The first preset control rule may be: executing a first on-off operation, wherein the first on-off operation comprises: controlling the first switch 105 to be open and the second switch 106 to be closed during a first time period; controlling the first switch 105 to be closed and the second switch 106 to be open during a second time period; and repeating the first on-off operation until the first battery pack 102 is open-circuited.

[0078] In this embodiment, the second time period is adjacent to the first time period and is located after the first time period. The durations of the first time period and the second time period can be set based on experience or other factors.

[0079] In this embodiment, when the battery circuit 100 is in the discharge state, the first switch 105 is controlled to be open and the second switch 106 is closed during a first time period. At this time, the second battery pack 103 charges the transformer unit 104. During a second time period, the first switch 105 is controlled to be closed and the second switch 106 is controlled to be open. At this time, the transformer unit 104 releases stored electrical energy. Specifically, the voltage at the output end of the transformer unit 104 (the end connected to the first switch 105) increases. Repeating this process will increase the voltage at the output end of the transformer unit 104 to the same level as the bus voltage. At this point, the first battery pack 102 is open-circuited. This allows only the second battery pack 103 to discharge, and the power output by the second battery pack 103 is higher than the power that the second battery pack 103 itself can output. In other words, the output power of the second battery pack 103 increases.

[0080] And / or, the control unit 108 is further configured to control the first switch 105 and the second switch 106 to be opened or closed according to a second preset control rule under a second preset condition, so that the input power of the first battery pack 102 is different from that of the second battery pack 103 .

[0081] 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: executing a second on-off operation, wherein the second on-off operation is to control the first switch 105 to be closed and the second switch 106 to be open during a third time period; to control the first switch 105 to be open and the second switch 106 to be closed during a fourth time period; and repeating the second on-off operation.

[0082] In this embodiment, the third time period is adjacent to the fourth time period and is located after the third time period. The durations of the third time period and the fourth time period can be set based on experience or other factors.

[0083] In this embodiment, while the battery circuit 100 is in the charging state, the first switch 105 is controlled to be closed and the second switch 106 is controlled to be open during the third time period. During this time, the first battery pack 102 and / or the charging device charge the transformer unit 104. During the fourth time period, the first switch 105 is controlled to be open and the second switch 106 is controlled to be closed. At this time, the transformer unit 104 releases stored electrical energy to charge the second battery pack 103 together with the charging device. In other words, the transformer unit 104 performs a voltage boost function. Since the first battery pack 102 is charged only by the charging device, while the second battery pack 103 is charged by both the transformer unit 104 and the same charging device, repeating this process can achieve an input power of the second battery pack 103 that is greater than the input power of the first battery pack 102. In other words, the input power of the second battery pack 103 is different from that of the first battery pack 102.

[0084] It is understood that if the second preset control rule is the opposite of the second on-off operation, that is, during the third time period, the first switch 105 is controlled to be off and the second switch 106 is controlled to be on; during the fourth time period, the first switch 105 is controlled to be on and the second switch 106 is controlled to be off; and this operation is repeated. This allows the input power of the first battery pack 102 to be 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 that of the first battery pack 102.

[0085] And / or, the control unit 108 is further used to control 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 that the first battery pack 102 charges the second battery pack 103 or the second battery pack 103 charges the first battery pack 102.

[0086] In this embodiment, the third preset condition may be that the charging current of the second battery pack 103 is less than the maximum charging current of the second battery pack 103. Accordingly, the third preset control rule is: execute a third on-off operation, wherein the third on-off operation is to control the first switch 105 to be closed and the second switch 106 to be open during a fifth time period, and to control the first switch 105 to be open and the second switch 106 to be closed during a sixth time period; and repeat the third on-off operation.

[0087] In this embodiment, the fifth time period is adjacent to the sixth time period and is located after the fifth time period. The durations of the fifth time period and the sixth time period can be set based on experience or other factors.

[0088] In this embodiment, if the charging current of the second battery pack 103 is less than the maximum charging current of the second battery pack 103, the first switch 105 is closed and the second switch 106 is opened during the fifth time period. At this time, the first battery pack 102 charges the transformer unit 104. During the sixth time period, the first switch 105 is opened and the second switch 106 is closed. At this time, the transformer unit 104 releases stored electrical energy to the second battery pack 103. In other words, the transformer unit 104 performs a voltage boost function. This process is repeated to enable the first battery pack 102 to charge the second battery pack 103.

[0089] It is understood that if the third preset condition is that the charging current of the first battery pack 102 is less than the maximum charging current of the first battery pack 102, the corresponding third preset control rule is a control rule that is opposite to the third on-off operation described above. That is, during the fifth time period, the first switch 105 is controlled to be open and the second switch 106 is controlled to be closed. During the sixth time period, the first switch 105 is controlled to be closed and the second switch 106 is controlled to be open. This operation is repeated. Based on this, the second battery pack 103 can charge the first battery pack 102.

[0090] And / or, the control unit 108 is further configured to control the first switch 105 and the second switch 106 to be disconnected under a fourth preset condition, so that the first battery pack 102 and the second battery pack 103 are connected in series to discharge or charge.

[0091] In this embodiment, the fourth preset condition is that the battery circuit 100 is in a discharging state or a charging state. Under the fourth preset condition, the first switch 105 and the second switch 106 are controlled to be disconnected. This allows the first battery pack 102 and the second battery pack 103 to discharge or charge together.

[0092] Based on the above content, the embodiment of the present application provides a Figure 1 Various controls for the battery circuit are shown.

[0093] In an embodiment of the present application, a battery circuit is provided, comprising: 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, and a ground terminal, wherein: 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 second terminal of the second switch is connected to the ground terminal; and the voltage conversion unit is connected between the negative electrode of the first battery pack and the second terminal of the first switch. Thus, the battery circuit provided in an embodiment of the present application can achieve: providing a hardware circuit foundation for controlling a dual battery pack consisting of the first battery pack and the second battery pack.

[0094] In one embodiment of the present application, 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. Figure 3 As shown, the battery circuit 100 provided in the embodiment of the present application further includes a filtering unit 109, wherein:

[0095] A first end of the filter unit 109 is connected to the positive electrode of the first battery pack 102 , a second end of the filter unit 109 is connected to the power supply terminal 101 , and a third end of the filter unit 109 is connected to the negative electrode of the first battery pack 102 .

[0096] In the embodiment of the present application, since the power type battery pack is usually used when the electric vehicle or hybrid vehicle generates peak power (such as the discharge peak power generated during the traction process and the charging peak power generated during the braking process), and is not needed in other cases. Therefore, in other cases, it is expected that the current value of the output current of the power type battery pack is 0. In this case, by setting the filtering unit 109, the current ripple of the first battery pack 102 can be suppressed, and the output current of the power type battery pack as the first battery pack 102 can be prevented from fluctuating around 0. In this way, the high-frequency rapid charging and discharging of the first battery pack 102 can be avoided, thereby reducing the problem of reduced life of the first battery pack 102.

[0097] In one embodiment of the present application, Figure 4 As shown, the filtering unit 109 includes a first inductor 1091 and a first capacitor 1092, wherein:

[0098] A first end of the first inductor 1091 is connected to the positive electrode of the first battery pack 102 , and a second end of the first inductor 1091 is connected to the power supply terminal;

[0099] A first end of the first capacitor 1092 is connected to the first end of the first inductor 1091 , and a second end of the first capacitor 1092 is connected to the negative electrode of the first battery pack 102 .

[0100] Of course, filtering units 109 with other structures may also be used, which will not be described in detail in the embodiments of the present application.

[0101] In the embodiment of the present application, the first inductor 1091 is a filter inductor, and the value of the first inductor 1091 can be set in the range of 2 to 1500 uH. The first capacitor 1092 is a filter capacitor, and the value of the first capacitor 1092 can be set in the range of 2 to 1500 uF.

[0102] It should be noted that, when the first battery pack 102 has its own filtering function, the first inductor 1091 and the first capacitor 1092 can be set to smaller values. For example, the first inductor 1091 is set to 2uH, and the first capacitor 1092 is set to 2uF.

[0103] Correspondingly, when the first battery pack 102 does not have a built-in filtering function, the first inductor 1091 and the first capacitor 1092 can be set to larger values. For example, the first inductor 1091 is set to 1500uH, and the first capacitor 1092 is set to 1500uF.

[0104] In the embodiment of the present application, a filter unit 109 with a simple structure is provided, which can reduce the hardware cost, design difficulty and board area of ​​the battery circuit 100.

[0105] In one embodiment of the present application, Figure 3 As shown, the battery circuit 100 provided in the embodiment of the present application further includes a first freewheeling unit 110 and a second freewheeling unit 111, wherein:

[0106] The input end of the first freewheeling unit 110 is connected to the second end of the first switch 105 , and the output end of the first freewheeling unit 110 is connected to the first end of the first switch 105 ;

[0107] An input end of the second freewheeling unit 111 is connected to the second end of the second switch 106 , and an output end of the second freewheeling unit 111 is connected to the first end of the second switch 106 .

[0108] In the embodiment of the present application, at the initial moment when the second switch 106 is closed and the first switch 105 is opened, it is usually impossible to immediately open the first switch 105 due to the freewheeling time and actuation time of the first switch 105. This would cause a short circuit between the first switch 105 and the second switch 106, which in turn could cause the first battery pack 102 and the second battery pack 103 to burn out due to the short circuit.

[0109] In the embodiment of the present application, a second freewheeling unit 111 is provided in parallel with both ends of the second switch 106, and the freewheeling unit 111 performs freewheeling. This delays the closing time of the second switch 106 when the first switch 105 is controlled to be open, thereby preventing the first battery pack 102 and the second battery pack 103 from short-circuiting and burning.

[0110] Similarly, in the embodiment of the present application, a first freewheeling unit 110 is provided in parallel across the first switch 105, and freewheeling is provided by the first freewheeling unit 110. This delays the closing time of the first switch 105 when the second switch 106 is controlled to be open, thereby preventing the first battery pack 102 and the second battery pack 103 from short-circuiting and burning.

[0111] In one embodiment of the present application, Figure 4 As shown, the first freewheeling unit 110 is a first diode 1101, and the second freewheeling unit 111 is a second diode 1111, wherein:

[0112] An anode of the first diode 1101 is connected to the second end of the first switch 105 , and a cathode of the first diode 1101 is connected to the first end of the first switch 105 ;

[0113] An anode of the second diode 1111 is connected to the second end of the second switch 106 ; and a cathode of the second diode 1111 is connected to the first end of the second switch 106 .

[0114] In the embodiment of the present application, a first freewheeling unit 110 and a second freewheeling unit 111 with simple structures are provided, which can reduce the hardware cost, design difficulty and board area of ​​the battery circuit 100.

[0115] In one embodiment of the present application, Figure 3 As shown, the battery circuit 100 provided in the embodiment of the present application further includes a voltage stabilization unit 112, wherein:

[0116] The voltage stabilizing unit 112 is connected between the power terminal 101 and the ground terminal 107 .

[0117] In the embodiment of the present application, the voltage stabilization unit 112 is used to filter out voltage fluctuations on the busbar, i.e., the line on which the power supply terminal 101 of the battery circuit 100 resides, thereby stabilizing the voltage supplied to the load. Furthermore, it is used to reduce the negative impact of voltage fluctuations generated by the first battery pack 102 and the transformer unit 104 on the second battery pack 103.

[0118] In one embodiment of the present application, Figure 4 As shown, the voltage stabilizing unit 112 can be exemplarily a second capacitor 1121. Of course, the voltage stabilizing unit 112 can also be implemented in other ways.

[0119] In one embodiment of the present application, the second capacitor 1121 is a support capacitor, and the value of the second capacitor 1121 can be set in the range of 2 to 1500 uF.

[0120] In the embodiment of the present application, a voltage stabilizing unit 112 with a simple structure is provided, which can reduce the hardware cost, design difficulty and board area of ​​the battery circuit 100.

[0121] An embodiment of the present application further provides a vehicle, which includes the battery circuit 100 provided in any of the above embodiments.

[0122] In the embodiment of the present application, the vehicle is an electric vehicle or a hybrid vehicle.

[0123] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles of the embodiments, practical applications, or technical improvements to technologies in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. A battery circuit, characterized in that: include: A power supply terminal, a first battery pack, a second battery pack of a type different from that of the first battery pack, a transformer unit, a first switch, a second switch, and a ground terminal, wherein: The positive electrode of the first battery pack is connected to the power supply terminal, and 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; A first end of the first switch is connected to the power supply end, and a second end of the first switch is connected to a first end of the second switch; The second end of the second switch is connected to the ground end; The voltage transformation unit is connected between the negative electrode of the first battery pack and the second end of the first switch; Wherein, the battery circuit further includes: a control unit, wherein a first end of the control unit is connected to a control end of the first switch, and a second end of the control unit is connected to a control end of the second switch; The control unit is used to control the first switch and the second switch to be opened or closed according to a first preset control rule under a first preset condition, so that the output power of the second battery pack is increased, the first preset control rule is to perform a first on-off operation, the first on-off operation is: control the first switch to be opened and the second switch to be closed in a first time period, control the first switch to be closed and the second switch to be opened in a second time period, repeat the first on-off operation until the first battery is open-circuited, the second time period is adjacent to the first time period and is located after the first time period, and the first preset condition is that the battery circuit is in a discharging state; and / or, under a second preset condition, controlling the first switch and the second switch to be opened or closed according to a second preset control rule, so that the input power of the first battery pack is different from that of the second battery pack, and the second preset condition is that the battery circuit is in a charging state; and / or, under a third preset condition, controlling the first switch and the second switch to be opened or closed according to a third preset control rule, so that the first battery pack charges the second battery pack, or the second battery pack charges the first battery pack, and when the third preset condition is that the charging current of the second battery pack is less than the maximum charging current of the second battery pack, so that the first battery pack charges the second battery pack, or when the third preset condition is that the charging current of the first battery pack is less than the maximum charging current of the first battery pack, so that the second battery pack charges the first battery pack; And / or, under a fourth preset condition, the first switch and the second switch are controlled to be disconnected so that the first battery pack and the second battery pack are discharged or charged in series, and the fourth preset condition is that the battery circuit is in a discharging state or a charging state.

2. The battery circuit according to claim 1, characterized in that: The first battery pack is a power type battery pack, and the second battery pack is an energy type battery pack; Alternatively, the first battery pack is the energy-type battery pack, and the second battery pack is a power-type battery pack.

3. The battery circuit according to claim 2, characterized in that: The first battery pack is a power type battery pack, the second battery pack is an energy type battery pack, and the battery circuit further includes: a filtering unit, wherein: The first end of the filter unit is connected to the positive electrode of the first battery pack, the second end of the filter unit is connected to the power supply end, and the third end of the filter unit is connected to the negative electrode of the first battery pack.

4. The battery circuit according to claim 3, characterized in that: The filtering unit comprises a first inductor and a first capacitor, wherein: The first end of the first inductor is connected to the positive electrode of the first battery pack, and the second end of the first inductor is connected to the power supply end; The first end of the first capacitor is connected to the first end of the first inductor, and the second end of the first capacitor is connected to the negative electrode of the first battery pack.

5. The battery circuit according to claim 1, characterized in that: The battery circuit further includes a first freewheeling unit and a second freewheeling unit, wherein: The input end of the first freewheeling unit is connected to the second end of the first switch, and the output end of the first freewheeling unit is connected to the first end of the first switch; An input end of the second freewheeling unit is connected to the second end of the second switch, and an output end of the second freewheeling unit is connected to the first end of the second switch.

6. The battery circuit according to claim 5, characterized in that: The first freewheeling unit is a first diode, and the second freewheeling unit is a second diode, wherein: An anode of the first diode is connected to the second end of the first switch, and a cathode of the first diode is connected to the first end of the first switch; An anode of the second diode is connected to the second end of the second switch; and a cathode of the second diode is connected to the first end of the second switch.

7. The battery circuit according to claim 1, characterized in that: The battery circuit further comprises a voltage stabilizing unit, wherein: The voltage stabilizing unit is connected between the power supply terminal and the ground terminal.

8. The battery circuit according to claim 7, characterized in that: The voltage stabilizing unit is a second capacitor.

9. The battery circuit according to claim 1, characterized in that: The voltage transformation unit is a second inductor.

10. A vehicle, characterized in that: The vehicle comprises a battery circuit as claimed in any one of claims 1 to 9.

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