Battery circuits and vehicles

Abstract

A battery circuit (100). The anode of a first battery pack (102) is connected to a power supply end (101), the cathode of the first battery pack (102) is connected to a cathode of a second battery pack (103); the cathode of the second battery pack (103) is connected to a ground end (107); a first end of a first switch (105) is connected to the power supply end (101), a second end of the first switch (105) is connected to a first end of a second switch (106), a control end of the first switch (105) is connected to a first output end of a control unit (108); a second end of the first switch (106) is connected to the ground end (107) and a control end of the second switch (106) is connected to a second output end of the control unit (108); a transformer unit (104) is connected between a negative pole of the first battery pack (102) and the second end of the first switch (105); the control unit (108) is used to control the closing or opening of the first switch (105) and the second switch (106) according to a state of charge value of at least one of the first battery pack (102) and the second battery pack (103). A vehicle is further provided.

Description

Technical Field

[0001] This disclosure claims priority to Chinese Patent Application No. 202210614126.2, filed on May 31, 2022, entitled "BATTERY CIRCUIT AND VEHICLE". The entire content of the application referenced above is incorporated herein by reference.

[0002] This disclosure relates to the technical field of vehicles, and more particularly, to battery circuits and vehicles.

Background Art

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

[0004] The state of charge (SOC) value is an important parameter for both the energy-type battery pack and the power-type battery pack. How to control a dual battery pack including a power-type battery pack and an energy-type battery pack according to the SOC value of the energy-type battery pack or the SOC value of the power-type battery pack has become a technical problem that needs to be urgently solved.

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] <UNK> This disclosure is intended to provide a new technical solution for a battery circuit.

Means for Solving the Problems

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

[0007] The anode of the first battery pack is connected to the power terminal. The cathode of the first battery pack is connected to the anode of the second battery pack.

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

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

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

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

[0012] The control unit is configured to control the first switch and the second switch to be closed or opened according to at least one of the state of charge (SOC) values ​​of the first battery pack and the SOC value of the second battery pack.

[0013] According to one embodiment of the present disclosure, the control unit is When the State of Charge (SOC) value of the power-type battery pack is less than a first preset threshold, the first and second switches are controlled to be closed or opened according to a first preset control rule so that the SOC value of the power-type battery pack becomes equal to or greater than the first preset threshold. When the State of Charge (SOC) value of the power battery pack is greater than or equal to a first preset threshold and less than or equal to a second preset threshold, the first and second switches are controlled to be closed or opened according to a second preset control rule so that the charging current or discharging current of the power battery pack becomes 0. When the State of Charge (SOC) value of the power-type battery pack is greater than a second preset threshold, or when the SOC value of the energy-type battery pack is less than a target value, the first and second switches are controlled to open in order to connect the first and second battery packs in series for charging. It is configured in this way.

[0014] According to one embodiment of the present disclosure, the deviation between the rated voltage of the first battery pack and the rated voltage of the second battery pack is less than the 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 the second preset range.

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

[0016] According to one embodiment of the present disclosure, the first battery pack is a power-type battery pack, the second battery pack is an energy-type battery pack, or The first battery pack is an energy-type battery pack, and the second battery pack is a power-type battery pack.

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

[0018] The first output terminal of the control subunit is connected to the input terminal of the PWM signal generation subset.

[0019] The first output terminal of the PWM signal generation subset is connected to the control terminal of the first switch. The second output terminal of the PWM signal generation subset is connected to the input terminal of the inverter.

[0020] The output terminal of the inverter is connected to the control terminal of the second switch.

[0021] According to an embodiment of the present disclosure, the first battery pack is a power-type battery pack, and the second battery pack is an energy-type battery pack. The battery circuit further includes a filtering unit.

[0022] The first terminal of the filtering unit is connected to the anode of the first battery pack. The second terminal of the filtering unit is connected to the power supply terminal. The third terminal of the filtering unit is connected to the cathode of the first battery pack.

[0023] According to an embodiment of the present disclosure, the filtering unit includes a first inductor and a first capacitor.

[0024] The first terminal of the first inductor is connected to the anode of the first battery pack. The second terminal of the first inductor is connected to the power supply terminal.

[0025] The first terminal of the first capacitor is connected to the first terminal of the first inductor. The second terminal of the first capacitor is connected to the cathode of the first battery pack.

[0026] According to one embodiment of the present disclosure, the battery circuit further includes a first freewheeling unit and a second freewheeling unit.

[0027] The input terminal of the first freewheeling unit is connected to the second terminal of the first switch. The output terminal of the first freewheeling unit is connected to the first terminal of the first switch.

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

[0029] According to one embodiment of the present disclosure, the first freewheeling unit is a first diode, and the second freewheeling unit is a second diode.

[0030] The anode of the first diode is connected to the second terminal of the first switch. The cathode of the first diode is connected to the first terminal of the first switch.

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

[0032] According to one embodiment of the present disclosure, the battery circuit further includes a voltage stabilization unit.

[0033] The voltage stabilization unit is connected between the power terminal and the ground terminal.

[0034] According to one embodiment of the present disclosure, the voltage stabilization unit is a second capacitor.

[0035] According to one embodiment of the present disclosure, the transformer unit is a second inductor.

[0036] According to a second aspect of this disclosure, a vehicle is provided. The vehicle includes a battery circuit in any implementation of the first aspect described above.

[0037] According to a battery circuit in one embodiment of the present disclosure, a dual battery pack including a first battery pack and a second battery pack can be controlled according to at least one of the SOC value of the first battery pack and the SOC value of the second battery pack.

[0038] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure given with reference to the drawings.

[0039] The drawings incorporated herein and constituting parts thereof illustrate embodiments of the herein and are used to illustrate the principles of the herein together with the description of the herein. [Brief explanation of the drawing]

[0040] [Figure 1] This is a schematic diagram I of a battery circuit according to one embodiment of the present disclosure. [Figure 2] This is a schematic diagram of a control unit according to one embodiment of the present disclosure. [Figure 3] This is diagram II of the structure of a battery circuit according to one embodiment of the present disclosure. [Figure 4] This is diagram III of the structure of a battery circuit according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0041] Various exemplary embodiments of this disclosure will be described in detail with reference to the drawings. Note that, unless otherwise specified, the relative arrangements, numerical expressions, and numerical values ​​of the components and steps described in the embodiments are not intended to limit the scope of this disclosure.

[0042] The following description of at least one exemplary embodiment is illustrative and does not in any way constitute a limitation on the Disclosure or on the application or use of the Disclosure.

[0043] While techniques, methods, and apparatus well known to those skilled in the art may not be discussed in detail, where appropriate, such techniques, methods, and apparatus should be considered part of this specification.

[0044] In the examples shown and discussed herein, any particular values ​​should be considered illustrative rather than limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0045] Note that in the following drawings, similar reference numbers and letters represent similar items. Therefore, once an item is defined in a drawing, it does not need to be discussed further in subsequent drawings.

[0046] One embodiment of the present disclosure provides a battery circuit 100. As shown in Figure 1, the battery circuit 100 includes a power terminal 101, a first battery pack 102, a second battery pack 103 of a different type from the first battery pack 102, a transformer unit 104, a first switch 105, a second switch 106, a ground terminal 107, and a control unit 108.

[0047] The anode of the first battery pack 102 is connected to the power terminal 101. The cathode of the first battery pack 102 is connected to the anode of the second battery pack 103.

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

[0049] The first terminal of the first switch 105 is connected to the power terminal 101. The second terminal of the first switch 105 is connected to the first terminal of the second switch 106. The control terminal of the first switch 105 is connected to the first output terminal of the control unit 108.

[0050] The second terminal of the second switch 106 is connected to the ground terminal 107. The control terminal of the second switch 106 is connected to the second output terminal of the control unit 108.

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

[0052] The control unit 108 is configured to control the first switch 105 and the second switch 106 to be closed or opened according to at least one of the state of charge (SOC) values ​​of the first battery pack 102 and the SOC value of the second battery pack 103.

[0053] In this embodiment of the present disclosure, a battery circuit is provided that includes a power terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a transformer unit, a first switch, a second switch, a ground terminal, and a control unit. The anode of the first battery pack is connected to the power terminal. The cathode of the first battery pack is connected to the anode of the second battery pack. The cathode of the second battery pack is connected to the ground terminal. The first terminal of the first switch is connected to the power terminal. The second terminal of the first switch is connected to the first terminal of the second switch. The control terminal of the first switch is connected to the first output terminal of the control unit. The second terminal of the second switch is connected to the ground terminal. The control terminal of the second switch is connected to the second output terminal of the control unit. The transformer unit is connected between the cathode of the first battery pack and the second terminal of the first switch. The control unit is configured to control the first and second switches to be closed or opened according to at least one of the SOC values ​​of the first battery pack and the SOC values ​​of the second battery pack. According to the battery circuit provided in this embodiment of the Disclosure, a dual battery pack including a first battery pack and a second battery pack can be controlled according to at least one of the SOC values ​​of the first battery pack and the SOC values ​​of the second battery pack.

[0054] In this embodiment of the disclosure, when the battery circuit 100 is in a discharge state, the power terminal 101 in the battery circuit 100 is configured to be connected to the power input terminal of the load, and the ground terminal 107 in the battery circuit 100 is configured to be connected to the ground terminal of the load. The load may, for example, be the motor of an electric vehicle or a hybrid vehicle.

[0055] Alternatively, when the battery circuit 100 is in a charging state, the power terminal 101 in the battery circuit 100 is configured to be connected to the power output terminal of the charging device, and the ground terminal 107 in the battery circuit 100 is configured to be connected to the ground terminal of the charging device. Illustratively, the charging device may be a charging pile or the braking system of an electric or hybrid vehicle.

[0056] In one embodiment of this disclosure, the transformer unit 104 may be a second inductor 1041, as shown in Figure 4. Of course, the transformer unit 104 can be implemented in a different manner.

[0057] In one embodiment of the present disclosure, the inductance value of the second inductor 1041 can be set in the range of 2 μH to 1500 μH.

[0058] In this embodiment of the present disclosure, when the transformer unit 104 is a second inductor 1041, the transformer unit 104 has a low-cost and simple structure.

[0059] In one embodiment of this disclosure, the first switch 105 and the second switch 106 may be a switch IC, a metal oxide semiconductor field-effect transistor (MOSFET), an insulated gate bipolar transistor (IGBT), a silicon carbide (SiC) switch, or the like.

[0060] Note that in this embodiment of the present disclosure, the first switch 105 and the second switch 106 are switches of the same type. Specifically, when the control terminals of the first and second switches receive a high level, both the first switch 105 and the second switch 106 are closed or opened. When the control terminals of the first and second switches receive a low level, both the first switch 105 and the second switch 106 are opened or closed.

[0061] In this embodiment of the present disclosure, the first battery pack 102 and the second battery pack 103 are of different types. Specifically, the first battery pack 102 is a power-type battery pack, and the second battery pack 103 is an energy-type battery pack. Alternatively, the first battery pack 102 is an energy-type battery pack, and the second battery pack 103 is a power-type battery pack.

[0062] In this embodiment of the disclosure, the power battery pack is a battery pack having high power density. Compared to energy battery packs, power battery packs can achieve high-power charge / discharge in a short time but store less energy. Power density is the maximum energy transfer power of a battery per unit weight or unit volume during charging or discharging. Furthermore, in this embodiment of the disclosure, the voltage value of the power battery pack can be set in the range of 100V to 1000V.

[0063] An energy-type battery pack is a battery pack having a high energy density. Compared to a power-type battery pack, an energy-type battery pack stores more energy but has insufficient short-time charge / discharge capacity. Energy density is the energy stored in a battery per unit weight or unit volume. Furthermore, in this embodiment of the present disclosure, the voltage value of the energy-type battery pack can be set in the range of 100V to 1000V.

[0064] In this embodiment of the Disclosure, the first battery pack 102 and the second battery pack 103 are not limited to any particular type, which can improve the compatibility of the battery circuit 100 provided in the embodiments of the Disclosure.

[0065] In this embodiment of the Disclosure, a State of Charge (SOC) value is used to represent the remaining capacity of the battery pack, which is numerically defined as the remaining capacity as a percentage of the battery pack's capacity, and is typically expressed as a percentage. The SOC value ranges from 0 to 1. When the SOC is equal to 0, the battery pack is fully discharged. When the SOC is equal to 1, the battery pack is fully charged.

[0066] In one embodiment of this disclosure, the State of Charge (SOC) of a battery pack can be estimated according to parameters such as the battery pack's voltage, charge / discharge current, and internal resistance. Of course, the SOC can also be obtained by other means. It should be noted that in this embodiment of the disclosure, the method for obtaining the SOC of a battery pack is not limited.

[0067] In this embodiment of the present disclosure, the control unit 108 is configured to control the first switch 105 and the second switch 106 to be closed or opened according to at least one of the SOC values ​​of the first battery pack 102 and the SOC value of the second battery pack 103, and this can be implemented in three specific ways.

[0068] First method: When the SOC value of the power battery pack is less than the first preset threshold SOC_low, the first switch 105 and the second switch 106 are controlled to be closed or opened according to the first preset control rule so that the SOC value of the power battery pack becomes equal to or greater than the first preset threshold SOC_low.

[0069] In this embodiment of the Disclosure, if the first battery pack 102 is a power-type battery pack and the second battery pack 103 is an energy-type battery pack, the first preset control rule is to perform a first on / off operation, the first on / off operation including controlling the first switch 105 to be opened and the second switch 106 to be closed within a first time frame, and controlling the first switch 105 to be closed and the second switch 106 to be opened within a second time frame. The first on / off operation is repeated.

[0070] The second time frame is adjacent to the first time frame and follows the first time frame. The periods corresponding to the first and second time frames can be set according to experience. The first preset threshold SOC_low is the minimum SOC value required for high-power discharge of the power battery pack.

[0071] In one embodiment of the present disclosure, a power battery pack has a large voltage drop during high-current discharge at low temperatures, and SOC_low ∈ [30%, 50%] is set. For example, SOC_low = 50% is set.

[0072] When the State of Charge (SOC) value of the power battery pack is less than the first preset threshold SOC_low, it indicates that the power battery pack cannot achieve high-power discharge. Therefore, during towing of an electric or hybrid vehicle, the power battery pack cannot supply the peak discharge output required by the electric or hybrid vehicle. Based on the above, the first switch 105 is controlled to open and the second switch 106 is controlled to close within a first time frame. In this case, the second battery pack 103 charges the transformer unit 104. The first switch 105 is controlled to close and the second switch 106 is controlled to open within a second time frame. In this case, the transformer unit 104 releases the stored power to the first battery pack 102. In other words, the transformer unit 104 implements a boosting function. The process is repeated so that the second battery pack 103 can charge the first battery pack 102. Based on the above, the State of Charge (SOC) value of the first battery pack 102 can be adjusted to be greater than the first preset threshold SOC_low. Furthermore, the first battery pack 102 can achieve high-power discharge. Therefore, during braking of an electric or hybrid vehicle, the first battery pack 102 can supply the peak discharge output required by the vehicle, ensuring the normal operation of the electric or hybrid vehicle.

[0073] In one embodiment of the present disclosure, the State of Charge (SOC) of the first battery pack 102 can be further adjusted so that it is greater than a first preset threshold SOC_low and less than a third preset threshold SOC_mid. The third preset threshold SOC_mid is the upper limit of the allowable SOC value of the first battery pack 102 when the second battery pack 103 charges the first battery pack 102. For example, SOC_mid = 60% is set.

[0074] If the first battery pack 102 is an energy-type battery pack and the second battery pack 103 is a power-type battery pack, note that the first preset control rule is to perform a second on / off operation, which includes controlling the first switch 105 to close and the second switch 106 to open within a first time frame, and controlling the first switch 105 to open and the second switch 106 to close within a second time frame. The second on / off operation is repeated. In this way, the first battery pack 102 can charge the second battery pack 103. Based on the above, the SOC value of the second battery pack 103 can be adjusted to be greater than the first preset threshold SOC_low. Furthermore, the second battery pack 103 can achieve high-power discharge. Therefore, during braking of an electric or hybrid vehicle, the second battery pack 103 can supply the peak discharge output required by the vehicle, ensuring the normal movement of the electric or hybrid vehicle.

[0075] Second method: When the SOC value of the power battery pack is greater than or equal to the first preset threshold SOC_low and less than or equal to the second preset threshold SOC_high, the first switch 105 and the second switch 106 are controlled to be closed or opened according to the second preset control rule so that the charging current or discharging current of the power battery pack becomes 0.

[0076] In one embodiment of this disclosure, when the SOC value of the power battery pack is greater than 80%, the charging current of the power battery pack is limited, so SOC_high∈[60%,80%] is set. As an example, SOC_high=70% is set.

[0077] When the State of Charge (SOC) value of the power battery pack is greater than or equal to the first preset threshold SOC_low and less than or equal to the second preset threshold SOC_high, it indicates that the power battery pack can supply the peak discharge output required by the electric or hybrid vehicle while towing the electric or hybrid vehicle, and can absorb the peak charge output while braking the electric or hybrid vehicle. In this case, the first switch 105 and the second switch 106 are controlled to be closed or opened so that the charging current or discharging current of the power battery pack becomes zero. The power battery pack can be controlled to remain in this state.

[0078] In this embodiment of the Disclosure, if the first battery pack 102 is a power-type battery pack and the second battery pack 103 is an energy-type battery pack, the second preset control rule may be to perform a second on / off operation when the battery circuit 100 is in a charging state. The second on / off operation includes controlling the first switch 105 to be closed and the second switch 106 to be opened within a third time frame, and controlling the first switch 105 to be opened and the second switch 106 to be closed within a fourth time frame. The steps are repeated.

[0079] In this embodiment of the present disclosure, the fourth time frame is adjacent to the third time frame and follows the third time frame. The periods corresponding to the third and fourth time frames can be set according to experience.

[0080] In this embodiment of the present disclosure, when the battery circuit 100 is in a charging state, the charging device is controlled to close the first switch 105 and open the second switch 106 within a third time frame so that the charging device charges only the transformer unit 104. Within a fourth time frame, the first switch 105 is controlled to open and the second switch 106 is controlled to close. In this case, the transformer unit 104 releases the stored power to the second battery pack 103. The process can be repeated to achieve a charging current of 0 for the first battery pack 102.

[0081] In this embodiment of the Disclosure, if the first battery pack 102 is a power-type battery pack and the second battery pack 103 is an energy-type battery pack, the second preset control rule may alternatively be to perform a third on / off operation when the battery circuit 100 is in a discharge state. The third on / off operation includes controlling the first switch 105 to be opened and the second switch 106 to be closed within a fifth time frame, and controlling the first switch 105 to be closed and the second switch 106 to be opened within a sixth time frame. The steps are repeated.

[0082] In this embodiment of the present disclosure, the sixth time frame is adjacent to the fifth time frame and follows the fifth time frame. The periods corresponding to the fifth and sixth time frames can be set according to experience.

[0083] In this embodiment of the Disclosure, when the battery circuit 100 is in a discharge state, the first switch 105 is controlled to open and the second switch 106 is controlled to close within a fifth time frame. In this case, the second battery pack 103 charges the transformer unit 104. Within a sixth time frame, the first switch 105 is controlled to close and the second switch 106 is controlled to open. In this case, the transformer unit 104 releases its stored power. In other words, the transformer unit 104 implements a rapid charging function. The steps are repeated. When the voltage at the output terminal of the transformer unit 104 (the terminal connected to the first switch 105) rises to the same voltage as the bus, the first battery pack 102 is opened-circuited so that its discharge current becomes zero.

[0084] Third method: When the SOC value of the power-type battery pack is greater than a second preset threshold, or the SOC value of the energy-type battery pack is less than a target value, the first switch 105 and the second switch 106 are controlled to open to connect the first battery pack 102 and the second battery pack 103 in series for charging.

[0085] When the State of Charge (SOC) value of the power battery pack is greater than the second preset threshold SOC_high, it indicates that the SOC value of the power battery pack is excessively high and therefore high-power charging cannot be achieved. In this case, the power battery pack cannot absorb the peak charge output during braking of the electric or hybrid vehicle. Based on the above, the first switch 105 and the second switch 106 are controlled to open so that the first battery pack 102 and the second battery pack 103 are connected in series for discharge. In this case, the SOC value of the first battery 102 is reduced to less than the second preset threshold SOC_high. In this way, the power battery pack can absorb the peak charge output during braking of the electric or hybrid vehicle.

[0086] The target value is the ratio of the State of Charge (SOC) of the power-type battery pack to K. K is the ratio of the capacity value of the power-type battery pack to the capacity value of the energy-type battery pack. K ∈ [1, 20].

[0087] When the State of Charge (SOC) of the energy-type battery pack is below the target value, it indicates that the SOC of the second battery pack 103 is excessively low and therefore the electric or hybrid vehicle cannot be driven. Based on the above, the first battery pack 102 and the second battery pack 103 are connected in series for discharge, and the first switch 105 and the second switch 106 are controlled to open in order to jointly drive the electric or hybrid vehicle.

[0088] In this embodiment of the present disclosure, a battery circuit is provided that includes a power terminal, a first battery pack, a second battery pack of a different type from the first battery pack, a transformer unit, a first switch, a second switch, a ground terminal, and a control unit. The anode of the first battery pack is connected to the power terminal. The cathode of the first battery pack is connected to the anode of the second battery pack. The cathode of the second battery pack is connected to the ground terminal. The first terminal of the first switch is connected to the power terminal. The second terminal of the first switch is connected to the first terminal of the second switch. The control terminal of the first switch is connected to the first output terminal of the control unit. The second terminal of the second switch is connected to the ground terminal. The control terminal of the second switch is connected to the second output terminal of the control unit. The transformer unit is connected between the cathode of the first battery pack and the second terminal of the first switch. The control unit is configured to control the first and second switches to be closed or opened according to at least one of the SOC values ​​of the first battery pack and the SOC values ​​of the second battery pack. According to the battery circuit provided in this embodiment of the Disclosure, a dual battery pack including a first battery pack and a second battery pack can be controlled according to at least one of the SOC values ​​of the first battery pack and the SOC values ​​of the second battery pack.

[0089] In this embodiment of the present disclosure, the deviation between the rated voltage U1 of the first battery pack 102 and the rated voltage U2 of the second battery pack 103 is less than the first preset range.

[0090] In this embodiment of the present disclosure, the first preset range is the allowable 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 is substantially the same as the rated voltage U2 of the second battery pack 103.

[0091] In one embodiment of the present disclosure, the first preset range may be, for example, 0.2*U1 or 0.2*U2. When the first preset range is 0.2*U1, then 1.2*U1 ≥ U2 ≥ 0.8*U1. When the first preset range is 0.2*U2, then 1.2*U2 ≥ U1 ≥ 0.8*U2.

[0092] It should be noted that in this embodiment of the present disclosure, the specific values ​​of the first preset range are not limited.

[0093] In this embodiment of the present disclosure, efficient energy transfer can be achieved between the first battery pack 102 and 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 a first preset range. For example, efficient mutual charging can be achieved between the first battery pack 102 and the second battery pack 103.

[0094] Generally, it should be noted that 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 for the load, i.e., U1 + U2 = Uout.

[0095] In one embodiment of this disclosure, the rated voltage U1 of the first battery pack 102 is the same as the rated voltage U2 of the second battery pack 103. In this way, the most efficient energy transfer can be achieved between the first battery pack 102 and the second battery pack 103.

[0096] Based on the above, as an example, Uout = 550V. In this case, U1 = U2 = 275V can be set.

[0097] In this embodiment of the present disclosure, the deviation between the ratio of the capacity Q1 of the first battery pack 102 to the capacity Q2 of the second battery pack 103 and the ratio of the maximum discharge rate X2 of the second battery pack 103 to the maximum discharge rate X1 of the first battery pack 102 is less than a second preset range.

[0098] The maximum discharge rate represents the ratio of the battery pack's maximum discharge current to its battery capacity. For example, if a battery pack with a capacity of 10Ah has a maximum discharge current of 50A, the maximum discharge rate of the battery pack is 50A / 10Ah = 5C.

[0099] In this embodiment of the Disclosure, the second preset range is an allowable 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 is substantially the same as the ratio of the maximum discharge rate X2 of the second battery pack 103 to the maximum discharge rate X1 of the first battery pack 102.

[0100] In one embodiment of the present disclosure, the second preset range may be, for example, ±0.5.

[0101] It should be noted that in this embodiment of the present disclosure, the specific values ​​of the second preset range are not limited.

[0102] In this embodiment of the Disclosure, the maximum discharge currents of the two battery packs may be substantially the same 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 a second preset range. Based on the above, for example, the two battery packs can be connected in series for stable discharge.

[0103] Generally, it should be noted that 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 for the load, i.e., Q1 + Q2 = Qnom.

[0104] In one embodiment of this disclosure, the ratio of the capacity Q1 of the first battery pack 102 to the capacity Q2 of the second battery pack 103 is the same as the ratio of the maximum discharge rate X2 of the second battery pack 103 to the maximum discharge rate X1 of the first battery pack 102. In this way, the maximum discharge currents of the two battery packs may be exactly the same.

[0105] Based on the above, as an example, Qnom = 120Ah. In this case, Q1 = 100Ah, Q2 = 20Ah, X1 = 1C, and X2 = 5C can be set.

[0106] In one embodiment of the present disclosure, a control unit 108 can control a first switch 105 and a second switch 106 to be closed or opened via a pulse-width modulation (PWM) signal according to a first or second preset control rule. The first switch 105 and the second switch 106 are controlled to be opened and closed according to the PWM signal. The opening duration and closing duration of the first switch and the second switch 106 are controlled according to the duty cycle of the PWM signal.

[0107] In one embodiment of the present disclosure, to implement the first specific implementation described above, the control unit 108 includes a control subunit 1081, a PWM signal generation subunit 1082, and an inverter 1082, as shown in Figure 2.

[0108] The first output terminal of the control subunit 1081 is connected to the input terminal of the PWM signal generation subunit 1082.

[0109] The first output terminal of the PWM signal generation subunit 1082 is connected to the control terminal of the first switch 105. The second output terminal of the PWM signal generation subunit 1082 is connected to the input terminal of the inverter 1083.

[0110] The output terminal of the inverter 1083 is connected to the control terminal of the second switch 106.

[0111] In this embodiment of the Disclosure, the control subunit 1081 stores a first preset threshold SOC_low and a second preset threshold SOC_high. The control subunit 108 is configured to obtain the SOC value of a power-type battery pack and the SOC value of an energy-type battery pack. In this embodiment of the Disclosure, the method by which the control subunit 108 obtains the SOC value of a power-type battery pack is not limited.

[0112] In one embodiment of the present disclosure, the control subunit 1081 may be, for example, a microcontroller unit (MCU), a central processing unit (CPU), and the like.

[0113] In this embodiment of the present disclosure, the control subunit 1081 is further configured to generate a PWM signal generation command according to the SOC value of the power battery pack or energy battery pack when the SOC value of the power battery pack (first battery pack 102 or second battery pack 103) is less than a first preset threshold SOC_low, and to output a PWM signal generation command to the PWM signal generation subunit 1082.

[0114] The PWM signal generation subunit 1082 is configured to output a PWM signal with an adjustable duty cycle under the control of the control subunit 1081.

[0115] The inverter 1083 is configured to invert the level output by the PWM signal generation subunit 1082.

[0116] In this embodiment of the disclosure, it should be noted that the control subunit 1081 can periodically obtain the State of Charge (SOC) value of a power battery pack or an energy battery pack. In this way, closed-loop negative feedback regulation can be achieved so that the duty cycle of the PWM signal generated by the PWM signal generation subunit 1082 can be changed, thereby allowing for more rapid adjustment of the SOC value of the power battery pack.

[0117] It can be understood that the aforementioned second method can be achieved using the method shown in Figure 2.

[0118] In this embodiment of the present disclosure, a control unit 108 having a simple structure is provided. In this way, the design difficulties of the battery circuit provided in the embodiment of the present disclosure can be reduced.

[0119] In one embodiment of the present disclosure, as shown in Figure 2, the control unit 108 includes a switch open signal generating subunit 1084 to control the opening of both the first switch 105 and the second switch 106.

[0120] The second output terminal of the control subunit 1081 is connected to the input terminal of the switch open signal generating subunit 1084.

[0121] The first output terminal of the switch open signal generating subunit 1084 is connected to the control terminal of the first switch 105 and the control terminal of the second switch 106, respectively.

[0122] In this embodiment of the present disclosure, the switch open signal generating subunit 1084 is configured to output signals to control the first switch 105 and the second switch 106 to be opened under the control of the control subunit 1081.

[0123] In one embodiment of the present disclosure, when the first battery pack 102 is a power-type battery pack and the second battery pack 103 is an energy-type battery pack, the battery circuit 100 provided in this embodiment of the present disclosure further includes a filtering unit 109, as shown in Figure 3.

[0124] The first terminal of the filtering unit 109 is connected to the anode of the first battery pack 102. The second terminal of the filtering unit 109 is connected to the power terminal 101. The third terminal of the filtering unit 109 is connected to the cathode of the first battery pack 102.

[0125] In this embodiment of the Disclosure, the power battery pack is typically used only when peak power is generated during the movement of an electric or hybrid vehicle (such as peak discharge power generated during towing and peak charge power generated during braking), so in another case, the output current of the power battery pack is expected to be zero. In such cases, the filtering unit 109 can suppress the current ripple of the first battery pack 102, preventing the output current of the power battery pack (first battery pack 102) from fluctuating around zero. In this way, high-frequency rapid charging / discharging of the first battery pack 102 can be avoided, thereby reducing the lifespan degradation of the first battery pack 102.

[0126] In one embodiment of the present disclosure, as shown in Figure 4, the filtering unit 109 includes a first inductor 1091 and a first capacitor 1092.

[0127] The first terminal of the first inductor 1091 is connected to the anode of the first battery pack 102. The second terminal of the first inductor 1091 is connected to the power terminal.

[0128] The first terminal of the first capacitor 1092 is connected to the first terminal of the first inductor 1091. The second terminal of the first capacitor 1092 is connected to the cathode of the first battery pack 102.

[0129] Of course, filtering units 109 of other structures, which are not described in detail in this embodiment of the present disclosure, can also be used.

[0130] In this embodiment of the present disclosure, the first inductor 1091 is a filter inductor, and the first inductor 1091 may be configured with a value in the range of 2 μH to 1500 μH. The first capacitor 1092 is a filter capacitor, and the first capacitor 1092 may be configured with a value in the range of 2 μF to 1500 μF.

[0131] It should be noted that when the first battery pack 102 has a filtering function, the first inductor 1091 and the first capacitor 1092 can be configured with relatively small values. For example, the first inductor 1091 can be configured with a value of 2 μH, and the first capacitor 1092 can be configured with a value of 2 μF.

[0132] Accordingly, when the first battery pack 102 does not have a filtering function, the first inductor 1091 and the first capacitor 1092 can be configured with relatively large values. For example, the first inductor 1091 can be configured with a value of 1500 μH, and the first capacitor 1092 can be configured with a value of 1500 μF.

[0133] In this embodiment of the present disclosure, a filtering unit 109 having a simple structure is provided, which can reduce the hardware cost, design difficulty, and footprint of the battery circuit 100.

[0134] In one embodiment of the present disclosure, as shown in Figure 3, the battery circuit 100 provided in this embodiment of the present disclosure further includes a first freewheeling unit 110 and a second freewheeling unit 111.

[0135] The input terminal of the first freewheeling unit 110 is connected to the second terminal of the first switch 105. The output terminal of the first freewheeling unit 110 is connected to the first terminal of the first switch 105.

[0136] The input terminal of the second freewheeling unit 111 is connected to the second terminal of the second switch 106. The output terminal of the second freewheeling unit 111 is connected to the first terminal of the second switch 106.

[0137] In this embodiment of the present disclosure, at the first moment when the second switch 106 is closed and the first switch 105 is opened, the first switch 105 cannot normally be controlled to open immediately as a result of the freewheeling time and the operating time of the first switch 105. As a result, a short circuit occurs immediately between the first switch 105 and the second switch 106, which causes the first battery pack 102 and the second battery pack 103 to be depleted.

[0138] In this embodiment of the present disclosure, a second freewheeling unit 110 is connected in parallel to two terminals of a second switch 106, and the second freewheeling unit 110 performs freewheeling. In this way, the closing time of the second switch 106 can be delayed while the first switch 105 is being opened, thereby preventing the first battery pack 102 and the second battery pack 103 from being depleted by a short circuit.

[0139] Similarly, in this embodiment of the present disclosure, the first freewheeling unit 109 is connected in parallel to the two terminals of the first switch 105, and the first freewheeling unit 109 performs freewheeling. In this way, the closing time of the first switch 105 can be delayed while the second switch 106 is being opened, thereby preventing the first battery pack 102 and the second battery pack 103 from being depleted by a short circuit.

[0140] In one embodiment of the present disclosure, as shown in Figure 4, the first freewheeling unit 110 is the first diode 1101, and the second freewheeling unit 111 is the second diode 1111.

[0141] The anode of the first diode 1101 is connected to the second terminal of the first switch 105. The cathode of the first diode 1101 is connected to the first terminal of the first switch 105.

[0142] The anode of the second diode 1111 is connected to the second terminal of the second switch 106. The cathode of the second diode 1111 is connected to the first terminal of the second switch 106.

[0143] In this embodiment of the present disclosure, a first freewheeling unit 110 and a second freewheeling unit 111 are provided, having a simple structure that can reduce the hardware cost, design difficulty, and footprint of the battery circuit 100.

[0144] In one embodiment of the present disclosure, as shown in Figure 3, the battery circuit 100 provided in this embodiment of the present disclosure further includes a voltage stabilization unit 112.

[0145] The voltage stabilization unit 1121 is connected between the power terminal 101 and the ground terminal 107.

[0146] In this embodiment of the present disclosure, the voltage stabilization unit 112 is configured to eliminate voltage fluctuations on the bus, i.e., the line on which the power terminals 101 of the battery circuit 100 are located, thereby stabilizing the voltage supplied to the load and further configured to reduce the negative impact on the second battery pack 103 of voltage fluctuations jointly generated by the first battery pack 102 and the transformer unit 104.

[0147] In one embodiment of this disclosure, as shown in Figure 4, the voltage stabilization unit 112 may be, exemplary, a second capacitor 1121. Of course, the voltage stabilization unit 112 can be implemented in other ways.

[0148] In one embodiment of the present disclosure, the second capacitor 1121 is a support capacitor, and the second capacitor 1121 can be configured with a value in the range of 2 μF to 1500 μF.

[0149] In this embodiment of the present disclosure, a voltage stabilization unit 112 having a simple structure is provided, which can reduce the hardware cost, design difficulty, and footprint of the battery circuit 100.

[0150] One embodiment of the present disclosure further provides a vehicle, the vehicle including a battery circuit 100 of any of the embodiments described above.

[0151] In this embodiment of the present disclosure, the vehicle is an electric vehicle or a hybrid vehicle.

[0152] Embodiments of the present disclosure have been described above. The above description is illustrative and non-exclusive, and the present disclosure is not limited to the embodiments disclosed. Many modifications and changes made without departing from the scope and spirit of the various embodiments will be apparent to those skilled in the art. The choice of terms used herein is intended to give the best description of the principle, the practical application of the various embodiments, or the technical improvements of the technology in the market, or to enable those skilled in the art to understand the embodiments disclosed herein. The scope of the present disclosure is defined by the appended claims. [Explanation of Symbols]

[0153] 100 battery circuit 101 Power terminal 102 First Battery Pack 103 Second Battery Pack 104 Transformer Unit 1041 Second inductor 105 First switch 106 The second switch 107 Ground terminal 108 Control Unit 1081 Control Subunit 1082 Pulse Width Modulation (PWM) Signal Generation Subunit 1083 Inverter 1084 Switch Open Signal Generating Subunit 109 Filtering Unit 1091 First Inductor 1092 First Capacitor 110 First Freewheeling Unit 1101 First diode 111 Second Freewheeling Unit 1111 Second diode 112 Voltage Stabilization Unit 1121 Second Capacitor

Claims

1. A battery circuit (100) comprising a power terminal (101), a first battery pack (102), a second battery pack (103) of a different type from the first battery pack (102), a transformer unit (104), a first switch (105), a second switch (106), a ground terminal (107), and a control unit (108), The anode of the first battery pack (102) is connected to the power terminal (101), and the cathode of the first battery pack (102) is connected to the anode of the second battery pack (103). The cathode of the second battery pack (103) is connected to the ground terminal (107), The first terminal of the first switch (105) is connected to the power terminal (101), the second terminal of the first switch (105) is connected to the first terminal of the second switch (106), and the control terminal of the first switch (105) is connected to the first output terminal of the control unit (108). The second terminal of the second switch (106) is connected to the ground terminal (107), and the control terminal of the second switch (106) is connected to the second output terminal of the control unit (108). The transformer unit (104) is connected between the cathode of the first battery pack (102) and the second terminal of the first switch (105). The control unit (108) is configured to control the first switch (105) and the second switch (106) to be closed or opened according to at least one of the state of charge (SOC) values ​​of the first battery pack (102) and the SOC value of the second battery pack (103). The first battery pack (102) is a power-type battery pack, and the second battery pack (103) is an energy-type battery pack, or The first battery pack (102) is an energy-type battery pack, and the second battery pack (103) is a power-type battery pack. The control unit (108) When the SOC value of the power-type battery pack is less than a first preset threshold, the first switch (105) and the second switch (106) are controlled to be closed or opened according to a first preset control rule so that the SOC value of the power-type battery pack becomes equal to or greater than the first preset threshold. When the SOC value of the power battery pack is greater than or equal to the first preset threshold and less than or equal to the second preset threshold, the first switch (105) and the second switch (106) are controlled to be closed or opened according to the second preset control rule so that the charging current or discharging current of the power battery pack becomes 0. A battery circuit (100) is configured to control the first switch (105) and the second switch (106) to open in order to connect the first battery pack (102) and the second battery pack (103) in series for discharge when the SOC value of the power-type battery pack is greater than the second preset threshold or the SOC value of the energy-type battery pack is less than the target value.

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

3. The rated voltage of the first battery pack (102) is the same as the rated voltage of the second battery pack (103), and / or The battery circuit (100) according to claim 2, wherein the ratio of the capacity of the first battery pack (102) to the capacity of the second battery pack (103) is the same as the ratio of the maximum discharge rate of the second battery pack (103) to the maximum discharge rate of the first battery pack (102).

4. The control unit (108) comprises a control subunit (1081), a pulse width modulation (PWM) signal generation subunit (1082), and an inverter (1083). The first output terminal of the control subunit (1081) is connected to the input terminal of the PWM signal generation subunit (1082), The first output terminal of the PWM signal generation subunit (1082) is connected to the control terminal of the first switch (105), and the second output terminal of the PWM signal generation subunit (1082) is connected to the input terminal of the inverter (1083). The battery circuit (100) according to claim 1, wherein the output terminal of the inverter (1083) is connected to the control terminal of the second switch (106).

5. The first battery pack (102) is a power-type battery pack, the second battery pack (103) is an energy-type battery pack, and the battery circuit (100) further comprises a filtering unit (109). The battery circuit (100) according to claim 1, wherein the first terminal of the filtering unit (109) is connected to the anode of the first battery pack (102), the second terminal of the filtering unit (109) is connected to the power terminal (101), and the third terminal of the filtering unit (109) is connected to the cathode of the first battery pack (102).

6. The filtering unit (109) comprises a first inductor (1091) and a first capacitor (1092), The first terminal of the first inductor (1091) is connected to the anode of the first battery pack (102), and the second terminal of the first inductor (1091) is connected to the power terminal (101). The battery circuit (100) according to claim 5, wherein the first terminal of the first capacitor (1092) is connected to the first terminal of the first inductor (1091), and the second terminal of the first capacitor (1092) is connected to the cathode of the first battery pack (102).

7. The present invention further comprises a first freewheeling unit (110) and a second freewheeling unit (111), The input terminal of the first freewheeling unit (110) is connected to the second terminal of the first switch (105), and the output terminal of the first freewheeling unit (110) is connected to the first terminal of the first switch (105), The battery circuit (100) according to claim 1, wherein the input terminal of the second freewheeling unit (111) is connected to the second terminal of the second switch (106), and the output terminal of the second freewheeling unit (111) is connected to the first terminal of the second switch (106).

8. The first freewheeling unit (110) is the first diode (1101), and the second freewheeling unit (111) is the second diode (1111), The anode of the first diode (1101) is connected to the second terminal of the first switch (105), and the cathode of the first diode (1101) is connected to the first terminal of the first switch (105), The battery circuit (100) according to claim 7, wherein the anode of the second diode (1111) is connected to the second terminal of the second switch (106), and the cathode of the second diode (1111) is connected to the first terminal of the second switch (106).

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

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

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

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

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