Battery circuit and vehicle

Abstract

The present application discloses a battery circuit and a vehicle, relating to the technical field of vehicles. The battery circuit includes: a power supply terminal, a first battery pack, a second battery pack, a voltage transformation unit, a first switch, a second switch, and a grounding terminal. 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 grounding terminal; the first end of the first switch is connected to the power supply terminal, and 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 grounding terminal; the voltage transformation unit is connected between the negative electrode of the first battery pack and the second end of the first switch; 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; the deviation between the ratio of the capacity of the first battery pack to the capacity of the second battery pack and the 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.

Description

Technical Field

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

[0002] With the development of technology, electric vehicles are gradually replacing fuel vehicles. As the core of electric vehicles, the battery is usually composed of a single type of battery pack. That is to say, the energy density and power density of the existing battery are fixed. However, in different driving scenarios, the energy density and power density requirements of electric vehicles for the battery are different. Therefore, in order to meet different energy density and power density requirements, a dual battery pack composed of a power-type battery pack and an energy-type battery pack is proposed.

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

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

[0005] According to a first aspect of the present application, there is provided a battery circuit, including: a power supply terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a voltage transformation 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] The first end of the first switch is connected to the power supply terminal, and the second end of the first switch is connected to the first end of the second switch;

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

[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] Wherein, 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;

[0012] And / or, the deviation between the ratio of the capacity of the first battery pack to the capacity of the second battery pack and the 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.

[0013] Optionally, the rated voltage of the first battery pack is the same as that of the second battery pack;

[0014] and / or, the ratio between the capacity of the first battery pack and the capacity of the second battery pack is the same as the ratio between the maximum discharge rate of the second battery pack and the maximum discharge rate of the first battery pack.

[0015] Optionally, the battery circuit further includes:

[0016] a control unit, 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;

[0017] wherein, the control unit is configured to control the first switch and the second switch to be turned off or on according to a first preset control rule under a first preset condition, so as to increase the output power of the second battery pack;

[0018] and / or, under a second preset condition, control the first switch and the second switch to be turned off or on according to a second preset control rule, so that the input powers of the first battery pack and the second battery pack are different;

[0019] and / or, under a third preset condition, control the first switch and the second switch to be turned off or on 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;

[0020] and / or, under a fourth preset condition, control the first switch and the second switch to be turned off, so that the first battery pack and the second battery pack are connected in series for discharging or charging.

[0021] Optionally, the first battery pack is a power-type battery pack, and the second battery pack is an energy-type battery pack;

[0022] Or, the first battery pack is the energy-type battery pack, and the second battery pack is the power-type battery pack.

[0023] 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:

[0024] a first end of the filtering unit is connected to a positive electrode of the first battery pack, a second end of the filtering unit is connected to the power supply terminal, and a third end of the filtering unit is connected to a negative electrode of the first battery pack.

[0025] Optionally, the filtering unit includes a first inductor and a first capacitor, wherein:

[0026] 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 terminal;

[0027] 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.

[0028] Optionally, the battery circuit further includes a first freewheeling unit and a second freewheeling unit, where:

[0029] The input terminal of the first freewheeling unit is connected to the second end of the first switch, and the output terminal of the first freewheeling unit is connected to the first end of the first switch;

[0030] The input terminal of the second freewheeling unit is connected to the second end of the second switch, and the output terminal of the second freewheeling unit is connected to the first end of the second switch.

[0031] Optionally, the first freewheeling unit is a first diode, and the second freewheeling unit is a second diode, where:

[0032] The anode of the first diode is connected to the second end of the first switch, and the cathode of the first diode is connected to the first end of the first switch;

[0033] The anode of the second diode is connected to the second end of the second switch; the cathode of the second diode is connected to the first end of the second switch.

[0034] Optionally, the battery circuit further includes a voltage stabilization unit, where:

[0035] The voltage stabilization unit is connected between the power supply terminal and the ground terminal.

[0036] Optionally, the voltage stabilization unit is a second capacitor.

[0037] Optionally, the transformer unit is a second inductor.

[0038] According to a second aspect of the present application, a vehicle is provided, and the vehicle includes the battery circuit according to any one of the above first aspects.

[0039] In an embodiment of the present application, a battery circuit is provided, including: a power supply terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a voltage conversion unit, a first switch, a second switch, and a ground terminal, where: 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; the first end of the first switch is connected to the power supply terminal, and 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 voltage conversion unit is connected between the negative electrode of the first battery pack and the second end of the first switch; wherein, 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; the deviation between the ratio of the capacity of the first battery pack to the capacity of the second battery pack and the 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. In this way, the battery circuit provided by the embodiment of the present application can achieve: providing a hardware circuit basis for the control of the dual battery pack composed of the first battery pack and the second battery pack.

[0040] Other features and advantages of the present application will become clear from the following detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings incorporated in the specification and constituting a part of the specification illustrate embodiments of the present application and, together with the description, are used to explain the principles of the present application.

[0042] Figure 1 is a schematic structural diagram of a battery circuit provided by an embodiment of the present application Figure 1 ;

[0043] Figure 2 is a schematic structural diagram of a battery circuit provided by an embodiment of the present application Figure 2 ;

[0044] Figure 3 is a schematic structural diagram of a battery circuit provided by an embodiment of the present application Figure 3 ;

[0045] Figure 4 is a schematic structural diagram of a battery circuit provided by an embodiment of the present application Figure 4 ;

[0046] REFERENCE SIGNS:

[0047] 100 - battery circuit; 101 - power supply terminal; 102 - first battery pack; 103 - second battery pack;

[0048] 104 - voltage conversion unit; 1041 - second inductor; 105 - first switch;

[0049] 106 - Second switch; 107 - Ground terminal; 108 - Control unit;

[0050] 109 - Filter unit; 1091 - First inductor; 1092 - First capacitor;

[0051] 110 - First freewheeling unit; 1101 - First diode;

[0052] 111 - Second freewheeling unit; 1111 - Second diode;

[0053] 112 - Voltage stabilization unit; 1121 - Second capacitor. Detailed implementation manners

[0054] 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 values set forth in these embodiments do not limit the scope of the present application.

[0055] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present application or its application or use.

[0056] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices should be regarded as part of the specification.

[0057] In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Thus, other examples of the exemplary embodiments may have different values.

[0058] It should be noted that: Like reference numerals and letters denote like items in the following drawings; thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0059] An embodiment of the present application provides a battery circuit 100, as Figure 1 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:

[0060] 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;

[0061] The negative electrode of the second battery pack 103 is connected to the ground terminal 107;

[0062] The first end of the first switch 105 is connected to the power supply terminal 101, and the second end of the first switch 105 is connected to the first end of the second switch 106;

[0063] The second end of the second switch 106 is connected to the ground terminal 107;

[0064] The voltage conversion unit 104 is connected between the negative electrode of the first battery pack 102 and the second end of the first switch 105;

[0065] Wherein, 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;

[0066] And / or, the ratio between the capacity of the first battery pack 102 and the capacity of the second battery pack 103 and the deviation between the maximum discharge rate of the second battery pack 103 and the maximum discharge rate of the first battery pack 102 are less than a second preset threshold.

[0067] In an embodiment of the present application, a battery circuit is provided, including: a power supply terminal, a first battery pack, a second battery pack different from the first battery pack in type, 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, 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; the first end of the first switch is connected to the power supply terminal, and 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 voltage conversion unit is connected between the negative electrode of the first battery pack and the second end of the first switch; wherein, 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; the ratio between the capacity of the first battery pack and the capacity of the second battery pack and the ratio deviation between the maximum discharge rate of the second battery pack and the maximum discharge rate of the first battery pack are less than a second preset range. In this way, the battery circuit provided by the embodiment of the present application can achieve: providing a hardware circuit basis for controlling a dual battery pack composed of the first battery pack and the second battery pack.

[0068] In an embodiment of the present application, when the battery circuit 100 is in a discharging state, the power supply terminal 101 in the battery circuit 100 is used to connect to the power input terminal of the load, and the ground terminal 107 in the battery circuit 100 is used to connect to the ground terminal of the load. Wherein, the load can be, for example, a motor of an electric vehicle or a hybrid vehicle.

[0069] Or, when the battery circuit 100 is in a charging state, the power supply terminal 101 in the battery circuit 100 is used to connect to the power output terminal of the charging device, and the ground terminal 107 in the battery circuit 100 is used to connect to the ground terminal of the charging device. Wherein, the charging device can be, for example, a charging pile, or a braking system of an electric vehicle or a hybrid vehicle.

[0070] In one embodiment of the present application, as Figure 4 shown, the voltage conversion unit 104 can be the second inductor 1041. Of course, the voltage conversion unit 104 can also be implemented in other ways.

[0071] In one embodiment of the present application, the inductance value of the second inductor 1041 can be set within the range of 2 to 1500 uH.

[0072] In an embodiment of the present application, when the voltage conversion unit 104 is the second inductor 1041, the voltage conversion unit 104 has low cost and a simple structure.

[0073] In one embodiment of the present application, the first switch 105 and the second switch 106 can be a switch IC, a MOSFET (full English name: Metal Oxide Semiconductor Field Effect Transistor; Chinese full name: Metal-Oxide Semiconductor Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor; Insulated Gate Bipolar Transistor), or a SiC (silicon carbide) switch, etc.

[0074] It can be understood that the first switch 105 further includes a control terminal to realize the control of the closing and opening of the first switch 105. Similarly, the second switch 106 also includes a control terminal to realize the control of the closing and opening of the second switch 106.

[0075] In an embodiment of the present application, the types of the first battery pack 102 and the second battery pack 103 are different. Specifically, the first battery pack 102 is a power-type battery pack, and the second battery pack 103 is an energy-type battery pack. Or, the first battery pack 102 is an energy-type battery pack, and the second battery pack 103 is a power-type battery pack.

[0076] In an embodiment of the present application, the power-type battery pack is specified as a battery pack with a high power density. Among them, the power density is specified as: the maximum power of energy transfer when the battery per unit weight or volume is charged or discharged. And in an embodiment of the present application, the voltage value of the power-type battery pack can be set within the range of 100 to 1000V.

[0077] The energy-type battery pack is a battery pack with a high energy density. Among them, the energy density is specified as: the energy stored in the battery per unit weight or volume. And in an embodiment of the present application, the voltage value of the energy-type battery pack can be set within the range of 100 to 1000V.

[0078] In an embodiment of the present application, 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 by the embodiment of the present application.

[0079] In the embodiment of the present application, 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 the first preset range.

[0080] In the embodiment of the present application, the first preset range is the allowable range of the deviation between the rated voltage U1 of the first battery pack 102 and the rated voltage U3 of the second battery pack 103. 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 less than the first preset range, it indicates that the rated voltage U1 of the first battery pack 102 and the rated voltage U2 of the second battery pack 103 are basically the same.

[0081] In an embodiment of the present application, the first preset range can be exemplarily 0.2*U1, or 0.2*U2. When the first preset range is 0.2*U1, 1.2*U1≥U2≥0.8*U1; when the first preset range is 0.2*U2, 1.2*U2≥U1≥0.8*U2.

[0082] It should be noted that the specific value of the first preset range in the embodiment of the present application is not limited.

[0083] In the embodiment of the present application, 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 less than the first preset range, efficient energy transfer between the first battery pack 102 and the second battery pack 103 can be achieved. For example, efficient mutual charging between the first battery pack 102 and the second battery pack 103 can be achieved.

[0084] It should be noted that generally, 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, that is, U1+U2=Uout.

[0085] In an embodiment of the present application, 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.

[0086] Based on the above content, in one example, Uout = 550V. On this basis, U1 = U2 = 275V can be set.

[0087] In the embodiment of the present application, the ratio between the capacity Q1 of the first battery pack 102 and the capacity Q2 of the second battery pack 103, and the ratio between the maximum discharge rate X2 of the second battery pack 103 and the maximum discharge rate X1 of the first battery pack 102 have a deviation less than the second preset range.

[0088] Among them, the maximum discharge rate represents the ratio of the maximum discharge current of the battery pack to the battery capacity. For example, for a battery pack with a battery capacity of 10 Ah and a maximum discharge current of 50 A, the maximum discharge rate is 50 A / 10 Ah = 5C.

[0089] In the embodiment of the present application, the second preset range is the range allowed for 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. When 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 the second preset range, it indicates that the ratio of the capacity Q1 of the first battery pack 102 to the capacity Q2 of the second battery pack 103 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 are basically the same.

[0090] In an embodiment of the present application, the second preset range can be exemplarily ±0.5.

[0091] It should be noted that the specific value of the second preset range in the embodiment of the present application is not limited.

[0092] In the embodiment of the present application, 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 less than the second preset range, the maximum discharge currents of the two can be made basically the same when discharging externally. Based on this, for example, stable external discharge in series can be achieved for the two.

[0093] It should be noted that generally, 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, that is, Q1 + Q2 = Qnom.

[0094] In an embodiment of the present application, 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 when discharging externally can be made exactly the same.

[0095] Based on the above, in an example, Qnom = 120 Ah. On this basis, Q1 = 100 Ah, Q2 = 20 Ah, X1 = 1C, and X2 = 5C can be set.

[0096] The battery circuit 100 provided by the embodiments of the present application Figure 1 as shown provides a hardware basis for controlling a dual battery pack composed of a power-type battery pack and an energy-type battery pack. Specifically, based on the battery circuit Figure 1 as shown, the dual battery pack composed of a power-type battery pack and an energy-type battery pack can be controlled according to the following content.

[0097] To achieve the control of the first switch 105 and the second switch 106, Figure 2 as shown, the battery circuit 100 further includes a control unit 108. Among them:

[0098] The first end of the control unit 108 is connected to the control end of the first switch 105, and the second end of the control unit 108 is connected to the control end of the second switch 106.

[0099] In an embodiment of the present application, the control unit 108 can be exemplarily a CPU or an MCU, etc.

[0100] And, the control unit 108 is used to control the first switch 105 and the second switch 106 to be turned off or on according to a first preset control rule under a first preset condition, so as to increase the output power of the second battery pack 103.

[0101] In this embodiment, the first preset condition can be that the battery circuit 100 is in a discharging state. The first preset control rule can be: perform a first on-off operation, where the first on-off operation is: control the first switch 105 to be turned off and the second switch 106 to be turned on within a first time period; control the first switch 105 to be turned on and the second switch 106 to be turned off within a second time period; repeat the first on-off operation until the first battery pack 102 is open-circuited.

[0102] In this embodiment, the second time period is adjacent to the first time period and is located after the first time period. The corresponding durations of the first time period and the second time period can be set according to experience or others.

[0103] In this embodiment, when the battery circuit 100 is in a discharging state, the first switch 105 is controlled to be turned off and the second switch 106 is controlled to be turned on during the first time period. At this time, the second battery pack 103 charges the voltage conversion unit 104. The first switch 105 is controlled to be turned on and the second switch 106 is controlled to be turned off during the second time period. At this time, the voltage conversion unit 104 releases the stored electric energy. That is, the voltage at the output end of the voltage conversion unit 104 (the end connected to the first switch 105) increases; by repeating this process, the voltage at the output end of the voltage conversion unit 104 will increase to the same as the bus voltage. At this time, the first battery pack 102 is open-circuited. In this way, only the second battery pack 103 can 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. That is, the output power of the second battery pack 103 increases.

[0104] And / or, the control unit 108 is further configured to control the first switch 105 and the second switch 106 to be turned off or on according to a second preset control rule under a second preset condition, so that the input powers of the first battery pack 102 and the second battery pack 103 are different.

[0105] 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: perform a second on-off operation, where the second on-off operation is to control the first switch 105 to be turned on and the second switch 106 to be turned off during the third time period; control the first switch 105 to be turned off and the second switch 106 to be turned on during the fourth time period; and repeat the second on-off operation.

[0106] In this embodiment, the third time period is adjacent to the fourth time period and is the time period after the third time period. The corresponding durations of the third time period and the fourth time period can be set according to experience or others.

[0107] In this embodiment, when the battery circuit 100 is in a charging state, the first switch 105 is controlled to be turned on and the second switch 106 is controlled to be turned off during the third time period. At this time, the first battery pack 102 and / or the charging device charges the voltage conversion unit 104. The first switch 105 is controlled to be turned off and the second switch 106 is controlled to be turned on during the fourth time period. At this time, the voltage conversion unit 104 releases the stored electric energy to charge the second battery pack 103 together with the charging device. That is, the voltage conversion unit 104 realizes a boosting function. Since the first battery pack 102 is only charged by the charging device, and the second battery pack 103 is charged by the voltage conversion unit 104 and the same charging device together, by repeating this process, the input power of the second battery pack 103 can be made greater than the input power of the first battery pack 102. That is, the input powers of the second battery pack 103 and the first battery pack 102 are different.

[0108] It can be understood that when the second preset control rule is a control rule opposite to the repetition of the above second on-off operation, that is, the first switch 105 is controlled to be turned off and the second switch 106 is controlled to be turned on within the third time period; the first switch 105 is controlled to be turned on and the second switch 106 is controlled to be turned off within the fourth time period; and this operation is repeated. It is possible to make the input power of the first battery pack 102 greater than the input power of the second battery pack 103. That is, the input powers of the second battery pack 103 and the first battery pack 102 are different.

[0109] And / or, the control unit 108 is further configured to control the first switch 105 and the second switch 106 to be turned off or on 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.

[0110] In this embodiment, the third preset condition may be that the charging current of the second battery pack 103 is less than the maximum charging current of the second battery pack 103. Correspondingly, the third preset control rule is: perform a third on-off operation, where the third on-off operation is to control the first switch 105 to be turned on and the second switch 106 to be turned off within a fifth time period, and control the first switch 105 to be turned off and the second switch 106 to be turned on within a sixth time period; and repeat the third on-off operation.

[0111] In this embodiment, the fifth time period is adjacent to the sixth time period and is the time period after the fifth time period. The corresponding durations of the fifth time period and the sixth time period can be set according to experience or others.

[0112] In this embodiment, when 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 controlled to be turned on and the second switch 106 is controlled to be turned off within the fifth time period. At this time, the first battery pack 102 charges the voltage conversion unit 104. The first switch 105 is controlled to be turned off and the second switch 106 is controlled to be turned on within the sixth time period. At this time, the voltage conversion unit 104 releases the stored electric energy to the second battery pack 103. That is, the voltage conversion unit 104 realizes the boosting function. Repeating this process can achieve the charging of the second battery pack 103 by the first battery pack 102.

[0113] It can be understood that when 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, correspondingly, the third preset control rule is a control rule opposite to the repetition of the above third on-off operation, that is, the first switch 105 is controlled to be turned off and the second switch 106 is controlled to be turned on within the fifth time period, and the first switch 105 is controlled to be turned on and the second switch 106 is controlled to be turned off within the sixth time period; and this operation is repeated. Based on this, it is possible to achieve the charging of the first battery pack 102 by the second battery pack 103.

[0114] And / or, the control unit 108 is further configured to control the first switch 105 and the second switch 106 to be turned off under a fourth preset condition, so that the first battery pack 102 and the second battery pack 103 are connected in series for discharging or charging.

[0115] 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 turned off. This can achieve the common discharging or charging of the first battery pack 102 and the second battery pack 103.

[0116] Based on the above, the embodiments of the present application provide various controls for a battery circuit as shown in Figure 1 shown.

[0117] In the embodiments of the present application, a battery circuit is provided, including: a power supply terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a voltage conversion unit, a first switch, a second switch, 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; the first end of the first switch is connected to the power supply terminal, and 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 voltage conversion unit is connected between the negative electrode of the first battery pack and the second end of the first switch; wherein, 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; the ratio between the capacity of the first battery pack and the capacity of the second battery pack and the ratio between the maximum discharge rate of the second battery pack and the maximum discharge rate of the first battery pack deviate less than a second preset range. In this way, the battery circuit provided by the embodiments of the present application can achieve: providing a hardware circuit basis for the control of a dual battery pack composed of the first battery pack and the second battery pack.

[0118] In an 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 Figure 3 shown, the battery circuit 100 provided by the embodiments of the present application further includes a filtering unit 109, wherein:

[0119] The first end of the filtering unit 109 is connected to the positive electrode of the first battery pack 102, the second end of the filtering unit 109 is connected to the power supply terminal 101, and the third end of the filtering unit 109 is connected to the negative electrode of the first battery pack 102.

[0120] 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 during driving (such as the discharge peak power generated during the traction process and the charging peak power generated during the braking process), and is not required to be used in other cases. Therefore, in other cases, it is desirable that 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 near 0. In this way, the high-frequency fast charge and discharge of the first battery pack 102 can be avoided, thereby reducing the problem of shortening the life of the first battery pack 102.

[0121] In an embodiment of the present application, as Figure 4 shown, the filtering unit 109 includes a first inductor 1091 and a first capacitor 1092, where:

[0122] The first end of the first inductor 1081 is connected to the positive electrode of the first battery pack 102, and the second end of the first inductor 1091 is connected to the power supply terminal;

[0123] The first end of the first capacitor 1092 is connected to the first end of the first inductor 1091, and the second end of the first capacitor 1092 is connected to the negative electrode of the first battery pack 102.

[0124] Of course, a filtering unit 109 with other structures can also be used, and the embodiments of the present application will not elaborate on this.

[0125] In the embodiment of the present application, the first inductor 1091 is a filtering 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 filtering capacitor, and the value of the first capacitor 1092 can be set in the range of 2 to 1500 uF.

[0126] It should be noted that when the first battery pack 102 has a built-in 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 2 uH, and the first capacitor 1092 is set to 2 uF.

[0127] 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 1500 uH, and the first capacitor 1092 is set to 1500 uF.

[0128] In the embodiment of the present application, a filtering unit 109 with a simple structure is provided, which can reduce the hardware cost, design difficulty, and board area of the battery circuit 100.

[0129] In an embodiment of the present application, asFigure 3 As shown in the figure, the battery circuit 100 provided by the embodiment of the present application further includes a first freewheeling unit 110 and a second freewheeling unit 111, where:

[0130] 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;

[0131] The input end of the second freewheeling unit 111 is connected to the second end of the second switch 106, and the output end of the second freewheeling unit 111 is connected to the first end of the second switch 106.

[0132] In the embodiment of the present application, at the initial moment when the second switch 106 is controlled to be closed and the first switch 105 is controlled to be opened, due to the freewheeling time and the operation time of the first switch 105, it is usually impossible to control the first switch 105 to open immediately. This will cause a short circuit between the first switch 105 and the second switch 106 for a short time, and further cause the first battery pack 102 and the second battery pack 103 to be burned out due to the short circuit.

[0133] In the embodiment of the present application, the second freewheeling unit 111 is set to be connected in parallel across the second switch 106, and the second freewheeling unit 111 conducts freewheeling. In this way, the time when the second switch 106 is closed can be delayed when the first switch 105 is controlled to be opened, thereby avoiding the problem that the first battery pack 102 and the second battery pack 103 are short-circuited and burned out.

[0134] Similarly, in the embodiment of the present application, the first freewheeling unit 110 is set to be connected in parallel across the first switch 105, and the first freewheeling unit 110 conducts freewheeling. In this way, the time when the first switch 105 is closed can be delayed when the second switch 106 is controlled to be opened, thereby avoiding the problem that the first battery pack 102 and the second battery pack 103 are short-circuited and burned out.

[0135] In an embodiment of the present application, as Figure 4 shown, the first freewheeling unit 109 is a first diode 1101, and the second freewheeling unit 111 is a second diode 1111, where:

[0136] The anode of the first diode 1101 is connected to the second end of the first switch 105, and the cathode of the first diode 1101 is connected to the first end of the first switch 105;

[0137] The anode of the second diode 1111 is connected to the second end of the second switch 106; the cathode of the second diode 1111 is connected to the first end of the second switch 106.

[0138] In an embodiment of the present application, a first freewheeling unit 110 and a second freewheeling unit 111 with a simple structure are provided, which can reduce the hardware cost, design difficulty, and board area of the battery circuit 100.

[0139] In an embodiment of the present application, as Figure 3 shown, the battery circuit 100 provided by the embodiment of the present application further includes a voltage stabilizing unit 112, where:

[0140] The voltage stabilizing unit 112 is connected between the power supply terminal 101 and the ground terminal 107.

[0141] In the embodiment of the present application, on the one hand, the voltage stabilizing unit 111 is used to filter the bus, that is, the voltage fluctuation on the line where the power supply terminal 101 of the battery circuit 100 is located, which can stably supply the voltage to the load. On the other hand, it is used to reduce the negative impact on the second battery pack 103 caused by the voltage fluctuation jointly generated by the first battery pack 102 and the voltage conversion unit 104.

[0142] In an embodiment of the present application, as Figure 4 shown, the voltage stabilizing unit 112 can be exemplarily the second capacitor 1121. Of course, the voltage stabilizing unit 112 can also be implemented in other ways.

[0143] In an 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.

[0144] 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.

[0145] The embodiment of the present application further provides a vehicle, which includes the battery circuit 100 provided in any of the above embodiments.

[0146] In the embodiment of the present application, the vehicle is an electric vehicle or a hybrid vehicle.

[0147] The above has described the embodiments of the present application. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements to the technologies in the market, or to enable other ordinary technical personnel in the technical field to understand the disclosed embodiments of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A battery circuit, characterized in that, 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, 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; The first end of the first switch is connected to the power supply terminal, and 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 voltage conversion unit is connected between the negative electrode of the first battery pack and the second end of the first switch; Wherein, 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, the deviation between the ratio of the capacity of the first battery pack to the capacity of the second battery pack and the 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; Wherein, the battery circuit further comprises: A control unit, the first end of the control unit is connected to the control end of the first switch, and the second end of the control unit is connected to the control end of the second switch; Wherein, the control unit is configured to control the first switch and the second switch to be turned on or off according to a first preset control rule under a first preset condition, so as to increase the output power of the second battery pack. The first preset control rule is to perform a first on-off operation, and the first on-off operation is: control the first switch to be turned off and the second switch to be turned on within a first time period, control the first switch to be turned on and the second switch to be turned off within a second time period, and repeat the first on-off operation until the first battery pack is open-circuited. The second time period is adjacent to the first time period and is located after the first time period; And / or, under a second preset condition, control the first switch and the second switch to be turned on or off according to a second preset control rule, so that the input powers of the first battery pack and the second battery pack are different. The second preset condition is that the battery circuit is in a charging state; And / or, under a third preset condition, control the first switch and the second switch to be turned on or off 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. 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, 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, the second battery pack charges the first battery pack; And / or, under a fourth preset condition, control the first switch and the second switch to be turned off, so that the first battery pack and the second battery pack are connected in series for discharging or charging.

2. The battery circuit according to claim 1, wherein The rated voltage of the first battery pack is the same as the rated voltage of the second battery pack; And / or, the ratio between the capacity of the first battery pack and the capacity of the second battery pack is the same as the ratio between the maximum discharge rate of the second battery pack and the maximum discharge rate of the first battery pack.

3. 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; Or, the first battery pack is the energy-type battery pack, and the second battery pack is the power-type battery pack.

4. The battery circuit according to claim 3, wherein 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, wherein: The first end of the filtering unit is connected to the positive electrode of the first battery pack, the second end of the filtering unit is connected to the power supply terminal, and the third end of the filtering unit is connected to the negative electrode of the first battery pack.

5. The battery circuit according to claim 4, wherein, The filtering unit includes 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 terminal; 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.

6. The battery circuit according to claim 1, wherein 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; The input end of the second freewheeling unit is connected to the second end of the second switch, and the output end of the second freewheeling unit is connected to the first end of the second switch.

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

8. The battery circuit according to claim 1, wherein The battery circuit further includes a voltage stabilizing unit, wherein: The voltage stabilizing unit is connected between the power supply terminal and the ground terminal.

9. The battery circuit according to claim 8, wherein The voltage stabilizing unit is a second capacitor.

10. The battery circuit according to claim 1, wherein, The voltage transformation unit is a second inductor.

11. A vehicle, characterized in that, The vehicle includes the battery circuit according to any one of claims 1-10.

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