Battery system with multiple battery packs

Abstract

The embodiment of the utility model provides a battery system with multiple battery packs. The battery system comprises the multiple battery packs; the battery packs are connected in series through a circuit provided with a relay; the positive electrode of each battery pack is connected with one stage of a power generator, one stage of a charging module and one stage of a driving motor by being connected with a prevention and control circuit module, and the negative electrode of each battery pack is connected with the other stage of the power generator, the other stage of the charging module and the other stage of the driving motor; wherein the prevention and control circuit module is used for preventing generation of circulating current and on-load switching; a relay is arranged on one line, connected with the generator, of each battery pack; relays are arranged on two lines, connected with the charging module, of each battery pack; and a relay is arranged on one line, connected with the driving motor, of each battery pack.

Description

Technical Field

[0001] This application relates to the field of vehicle battery system technology, and in particular to a multi-battery pack battery system. Background Technology

[0002] Currently, the batteries in range-extended and hybrid vehicles are mainly composed of multiple battery packs. These battery packs drive the vehicle's electric motor, which in turn propels the vehicle. The electric motor can also recharge the batteries. Furthermore, the batteries can be charged not only through charging stations but also by using fuel to drive a generator.

[0003] Therefore, the battery systems of these vehicle models need to perform many functions. Consequently, current vehicles in these models typically treat all battery packs as a single unit, with each battery pack discharging simultaneously while the vehicle is in motion. Correspondingly, during regenerative braking, charging via a charging station, and alternator charging, all battery packs are charged simultaneously.

[0004] However, because all battery packs discharge simultaneously, when the batteries are depleted, no battery power is available to drive the vehicle, and it must rely entirely on fuel. Therefore, it cannot operate within the fuel-efficient range, resulting in excessively high fuel consumption. Furthermore, charging all battery packs simultaneously takes a long time until they are ready to operate, further impacting fuel consumption. Moreover, simultaneous charging and discharging cannot adequately meet the needs of various scenarios. Utility Model Content

[0005] In view of the shortcomings of the prior art, this application provides a multi-battery pack battery system to solve the problems of high fuel consumption and inability to meet the needs of various scenarios in the prior art.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] The first aspect of this application provides a multi-battery pack battery system, comprising:

[0008] Multiple battery packs;

[0009] Each of the battery packs is connected in series via a circuit equipped with a relay;

[0010] The positive terminal of each battery pack is connected to the generator, the charging module, and the first stage of the drive motor via a control circuit module, and the negative terminal of each battery pack is connected to the generator, the charging module, and the other stage of the drive motor; wherein, the control circuit module is used to prevent circulating current and load switching;

[0011] A relay is installed on one of the lines connecting each battery pack to the generator;

[0012] Each of the two lines connecting the battery pack to the charging module is equipped with a relay.

[0013] A relay is installed on one of the lines connecting each battery pack to the drive motor.

[0014] Optionally, in the above-described multi-battery pack battery system, the control circuit module includes:

[0015] Parallel input and output control lines;

[0016] The input control line and the output control line are respectively equipped with a power switch and a reverse protection diode connected in series, and the power switch is connected to the battery pack, and the reverse protection diode is connected to the generator, the charging module and the drive motor respectively;

[0017] The current flows in different directions in the input control line and the output control line.

[0018] Optionally, in the above-described multi-battery pack battery system, the control circuit module further includes:

[0019] A pre-charge circuit connected in parallel with the power switch on the output control circuit;

[0020] The precharge line includes a resistor and a precharge relay connected in series.

[0021] Optionally, in the above-described multi-battery system, the power switch is an insulated-gate bipolar transistor.

[0022] Optionally, in the above-described multi-battery system, a relay is provided on the line connecting the negative terminal of each battery pack to the generator.

[0023] Optionally, in the above-described multi-battery system, the charging module connects to the negative terminal of the battery pack via a relay-equipped line that connects to the relay on the line connecting the negative terminal of the battery pack and the generator.

[0024] Optionally, the above-mentioned multi-battery pack battery system further includes:

[0025] A current sensor corresponding to each of the battery packs;

[0026] Each current sensor is connected in series in the connection line between the negative terminal of its corresponding battery pack and the target relay; the target relay is a relay on the line connecting the negative terminal of the battery pack corresponding to the current sensor to the generator.

[0027] Optionally, in the above-described multi-battery system, the drive motor is connected to the negative terminal of each battery pack via a target relay; wherein, one target relay is a relay on the line connecting the negative terminal of one battery pack to the generator.

[0028] Optionally, the above-mentioned multi-battery pack battery system further includes:

[0029] A fuse connected in series between the positive terminal of each battery pack and the control circuit module.

[0030] Optionally, in the above-described multi-battery system, each of the relays and the control circuit module is connected to the vehicle controller for control.

[0031] This application provides a multi-battery pack battery system, comprising multiple battery packs. Each battery pack is connected in series via a circuit equipped with relays. The positive terminal of each battery pack is connected to a generator, a charging module, and a drive motor via a control circuit module. The negative terminal of each battery pack is connected to another stage of the generator, charging module, and drive motor. A relay is installed on one of the lines connecting each battery pack to the generator. Relays are installed on both lines connecting each battery pack to the charging module. A relay is installed on one of the lines connecting each battery pack to the drive motor. Therefore, by closing and opening the corresponding relays connecting to the charging module, any number of battery packs can be connected in parallel with the charging module. This allows for parallel charging of multiple battery packs via a charging station connected to the charging module, improving charging efficiency and ensuring relatively consistent voltage across each battery pack during charging, thus contributing to improved overall battery performance and lifespan. Alternatively, any number of adjacent battery packs can be connected in series with the charging module, enabling series charging of multiple battery packs and achieving high-voltage charging. By closing and opening the corresponding relays connecting the generator, any number of battery packs can be connected to the generator, allowing the generator to use excess power to charge any number of battery packs, thus enabling series or parallel charging of any battery packs. Similarly, by closing and opening the corresponding relays connecting the drive motor, any one or more battery packs can be connected to the drive motor, allowing for parallel discharge of any single battery pack or any number of battery packs. Battery pack switching is also possible, enabling series discharge of a single battery pack or any number of battery packs. Furthermore, the control circuit module prevents circulating currents and facilitates load switching, thus avoiding the generation of circulating currents and ensuring that multiple battery packs can discharge simultaneously. Load switching also allows for switching the discharging battery pack at any time during driving. Therefore, it is not necessary for all battery packs to discharge simultaneously, preventing simultaneous depletion. Load switching of any battery pack ensures that the battery pack can be connected to the vehicle, keeping the vehicle in an economical fuel range and reducing fuel consumption. Moreover, charging can flexibly select multiple battery packs for series or parallel charging, ensuring faster charging. Therefore, the battery system provided in this application can flexibly charge and discharge the battery pack, which not only reduces the vehicle's fuel consumption but also effectively meets the needs of various scenarios. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This application provides a schematic diagram of the architecture of a multi-battery pack battery system.

[0034] Figure 2 A schematic diagram of the architecture of a multi-battery pack battery system provided in another embodiment of this application;

[0035] Figure 3 A schematic diagram of the architecture of another multi-battery pack battery system provided in another embodiment of this application;

[0036] Figure 4 A schematic diagram of the architecture of another multi-battery pack battery system provided in another embodiment of this application;

[0037] Figure 5 This is a schematic diagram of the architecture of another multi-battery pack battery system provided in yet another embodiment of this application. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0039] In this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] This application provides a multi-battery pack battery system, such as... Figure 1 As shown, it includes:

[0041] Multiple battery packs.

[0042] Optionally, the number and specifications of batteries in each battery pack are usually the same. Of course, they can also be different.

[0043] like Figure 1As shown, the battery packs are connected in series via a circuit equipped with relays. That is, the negative terminal of the last battery in the previous battery pack is connected to the positive terminal of the first battery in the next battery pack, and a relay is installed on the connecting circuit. By closing and opening these relays, any number of adjacent battery packs can be connected in series, and thus, any number of adjacent battery packs can be charged in series as needed.

[0044] like Figure 1 As shown, the positive terminal of each battery pack is connected to the generator, charging module, and drive motor stage one via a control circuit module, while the negative terminal of the battery pack is connected to the generator, charging module, and drive motor stage another.

[0045] The control circuit module is used to prevent circulating current and load switching.

[0046] In other words, each battery pack is connected in parallel to the generator, charging module, and drive motor, so that each battery pack can be charged and discharged individually, or any one or more battery packs can be charged and discharged in parallel.

[0047] The control circuit module effectively prevents multiple battery packs from discharging in parallel. It precisely controls the switching on and off of the control circuit module, ensuring current flows along the normal path and preventing circulating current. Furthermore, it enables load switching and stable voltage and current control, allowing the system to switch to other battery packs for discharge when one battery pack is nearly depleted, without affecting normal vehicle operation.

[0048] Furthermore, a relay is installed on one of the lines connecting each battery pack to the generator.

[0049] For example, such as Figure 1 As shown, a relay is installed on the line connecting the negative terminal of each battery pack to the generator. Therefore, by closing and opening this relay, the battery pack to be charged by the generator can be selected.

[0050] Similarly, as Figure 1 As shown, each battery pack is equipped with a relay on both lines connecting to the charging module; that is, a relay is installed on each of the two lines connecting the positive and negative terminals of the battery pack to the charging module.

[0051] The charging module is the module that interfaces with the charging station; for example, it can be a charging interface. Therefore, by using the set relays, it is possible to select parallel or series charging, and to select the battery pack to be charged.

[0052] Similarly, a relay is installed on one of the lines connecting each battery pack to the drive motor. Specifically, it can be seen as follows: Figure 1As shown, a relay is installed on the line connecting the negative terminal of the battery pack to the drive motor.

[0053] Optionally, in another embodiment of the battery system with multiple battery packs provided in this application, the control circuit module, such as Figure 2 As shown, it includes:

[0054] The two parallel lines are the input prevention and control line and the output prevention and control line.

[0055] The input and output control lines are equipped with a power switch and a reverse protection diode connected in series, respectively. The power switch is connected to the battery pack, and the reverse protection diode is connected to the generator, the charging module, and the drive motor.

[0056] In other words, each of the two parallel lines is equipped with a power switch and a reverse protection diode. One end of the power switch is connected to the positive terminal of the battery pack, and the other end is connected to the reverse protection diode. The other end of the reverse protection diode is connected to the generator, the charging module, and the drive motor, respectively.

[0057] The current flows in different directions in the input and output control circuits. Specifically, for example... Figure 2 As shown, the upper control circuit allows the current to flow into the battery pack, thus charging the battery. The lower control circuit allows the current to flow out of the battery pack, thus driving the drive motor.

[0058] Optionally, in another embodiment of the battery system provided in this application, such as Figure 3 As shown, the control circuit module also includes:

[0059] A pre-charge circuit connected in parallel with the power switch on the output control circuit.

[0060] The precharge line contains a resistor and a precharge relay connected in series.

[0061] Therefore, before starting charging and discharging, the X capacitor of the motor in the motor control can be precharged by turning on the precharge relay of the precharge circuit, so that the X capacitor of the motor is charged to the same voltage as the battery. In this way, the current of the entire circuit is limited by the resistor in the precharge amount, thereby avoiding the large difference between the battery voltage and the capacitor voltage, which would cause a large current surge.

[0062] Optionally, in another embodiment of the battery system with multiple battery packs provided in this application, the power switch is an insulated gate bipolar transistor, i.e., IGBT. Of course, it can also be a power switch such as a SiC MOSFET or a solid-state relay. Using IGBT as a power switch can also reduce the complexity and cost of the drive circuit.

[0063] Optionally, in another embodiment of the battery system provided in this application, such as Figure 4 As shown, a relay is installed on the line connecting the negative terminal of each battery pack to the generator.

[0064] Specifically, such as Figure 4 The relays K1 and K2 shown are used to connect to the generator.

[0065] Accordingly, in the multi-battery pack battery system provided in the embodiments of this application, such as Figure 4 As shown, the charging module connects to the negative terminal of the battery pack via a relay-equipped circuit, which is connected to the relay on the circuit connecting the generator.

[0066] For example, for battery pack A, the connection between the charging module and the negative terminal of the battery pack is specifically connected to relay K1, and a relay K5 is also installed on the line connecting relay K1. For battery pack B, the connection between the charging module and the negative terminal of the battery pack is specifically connected to relay K2, and a relay K7 is also installed on the line connecting relay K2. Therefore, there are two relays on the connection line between the charging module and the negative terminal of one battery pack, and the connection is controlled by the on / off state of these two relays.

[0067] Accordingly, in the multi-battery pack battery system provided in the embodiments of this application, see also Figure 4 The drive motor is connected to the negative terminal of each battery pack by connecting each target relay.

[0068] One of the target relays is a relay on the line connecting the negative terminal of a battery pack to the generator, for example, such as... Figure 4 The relays K1 and K2 are shown.

[0069] Therefore, as Figure 4 As shown, the negative terminals of the generator and drive motor connected to the battery pack are two branches of the line where the target relay is located. Therefore, the target relay is the common relay on the negative terminals of the generator and drive motor connected to the battery pack.

[0070] It should be noted that since the vehicle will only be in one mode at a time, it will not have any impact, and this design makes the system architecture simpler.

[0071] Optionally, in another embodiment of this application, in order to measure the current of each battery pack, in the multi-battery pack battery system provided in another embodiment of this application, such as Figure 5 As shown, it also includes:

[0072] Each battery pack has a corresponding current sensor.

[0073] Each current sensor is connected in series in the connection line between the negative terminal of its corresponding battery pack and the target relay.

[0074] The target relay is the relay on the line connecting the negative terminal of the battery pack corresponding to the current sensor to the generator, i.e., as shown below. Figure 5 The relays K1 and K2 are shown in the diagram. Therefore, for example, as... Figure 5 As shown, current sensor 1 and current sensor 2 are installed on the line between the battery pack and the accessories of relay K1 and relay K2.

[0075] Alternatively, to protect the safety of each battery pack, please refer to... Figure 5 As shown, in another embodiment of the battery system with multiple battery packs provided in this application, the system further includes:

[0076] A fuse connected in series between the positive terminal of each battery pack and the control circuit module.

[0077] Optionally, in another embodiment of the battery system with multiple battery packs provided in this application, each relay and control circuit module is connected to the vehicle controller for control by the vehicle controller.

[0078] Therefore, the vehicle controller can control the closing and opening of various relays and the power relays and pre-charge relays in the control circuit module, thereby achieving the switching of various modes. This allows for the generation of electricity by the generator to charge the battery pack, the implementation of series and parallel charging via the charging module, the discharge of the battery pack to the drive motor, and the drive motor feeding back electricity to the battery pack. Specific modes can include parallel charging, series charging, generator power generation, motor feedback, single battery pack discharge, parallel battery pack discharge, and battery pack switching during discharge.

[0079] Optionally, during parallel charging, the relays on the lines connecting one of the battery packs to the drive motor and the pre-charge relays can be closed first to pre-charge the X capacitor of the motor. After pre-charging, the power switch on the output current limiting circuit of the battery pack is turned on, and then the relays on the lines connecting the battery pack to the drive motor and the pre-charge relays are disconnected to complete the pre-charging operation. Next, the power switches on the input control circuits of each battery pack to be charged in parallel are turned on to allow current to flow into the battery packs for charging, and the relays on the lines connecting the negative terminals of each battery pack to the charging module are closed. It should be noted that if the lines connected to the negative terminals of the battery packs, such as Figure 4The diagram shows two relays. Both relays need to be closed. Finally, the relays on the lines connecting the positive terminals of each battery pack to the charging module are closed, so that each battery pack forms a closed circuit with the charging model, and then the charging module charges the battery packs in parallel.

[0080] Because the charging is done in parallel, the charging of each battery pack does not affect the others. Therefore, once any battery pack is fully charged, the two power switches connected to it are turned off, and then the relay on the line connecting the negative terminal of that battery pack to the charging module is disconnected, ending the charging of that battery pack. Finally, after all battery packs have finished charging, the relays on the line connecting the positive terminal of each battery pack to the charging module are disconnected.

[0081] For example, with Figure 5 For example, let's perform parallel charging of battery pack A and battery pack B. Specifically, first close relay K1 and pre-charge relay Pre-C1 of battery pack A to pre-charge the X capacitor of the motor. After pre-charging is complete, turn on power switch VT2 and disconnect relay K1 and pre-charge relay Pre-C1. Alternatively, first close relay K2 and pre-charge relay Pre-C2 of battery pack B to pre-charge the X capacitor of the motor. After pre-charging is complete, turn on power switch VT4 and disconnect relay K2 and pre-charge relay Pre-C2.

[0082] Then, power switch VT1 is turned on, activating relays K1 and K5. Simultaneously, power switch VT3 is turned on, activating relays K2 and K7. Next, relays K4 and K6 are closed, allowing the charging station to charge battery packs A and B in parallel via the charging module. Once battery pack A is fully charged, power switches VT1 and VT2 are turned off first, then relays K1 and K5 are disconnected. Similarly, once battery pack B is fully charged, power switches VT3 and VT4 are turned off first, then relays K2 and K7 are disconnected. Finally, relays K4 and K6 are disconnected, ending the fast charging process via the charging station.

[0083] During series charging, the specific steps are as follows: First, close the relays on the series circuits of the battery packs to be charged, the pre-charge relay of the first battery pack, and the relays on the connection lines between the negative terminal of the last battery pack and the charging module / generator, thus pre-charging the X capacitor of the motor. After pre-charging, turn on the power switch on the output control circuit of the first battery pack, and then disconnect the pre-charge relay of the first battery pack. Next, close the relays on the circuit between the negative terminal of the last battery pack and the charging module, and the power switch on the input control circuit of the first battery pack. Then, close the relays on the connection lines between the positive terminal of the first battery pack and the charging module, thus forming a series connection between the battery packs and the charging module, and starting series charging of the battery packs. After the series-connected battery packs are fully charged, first disconnect the two power switches connected to the first battery pack, and then disconnect the relays on the series circuits between the negative terminals of the battery packs. Finally, disconnect the relays on the connection lines between the positive terminal of the first battery pack and the charging module, completing the series charging.

[0084] For example, with Figure 5 For example, let's perform series charging of battery packs A and B. First, close relays K2 and K3, as well as pre-charge relay Pre-C1, to pre-charge the X capacitor of the motor. After pre-charging is complete, turn on power switch VT2 and disconnect pre-charge relay Pre-C1. Then, close relay K7 and turn on power switch VT1. Next, close relay K4, allowing the series-connected battery packs A and B to be charged via the fast charging station. After the series-connected batteries are fully charged, first disconnect power switches VT1 and VT2, then disconnect relays K2, K3, and K7. Finally, disconnect relay K4 to end the series fast charging.

[0085] When the generator is driving the motor, any excess power can be used to charge the battery packs. Specifically, when the generator is generating electricity and charging the battery packs, the relays on the circuits connecting the negative terminals of each battery pack that needs to be charged through the generator are first closed, and the power switches on the input control circuits connected to each battery pack are opened. This closes the connection between each battery pack and the generator, allowing the generator to charge each battery pack. Once each battery pack has reached its maximum charging value, the closed relays are opened, and the previously opened power switches are turned off.

[0086] For example, with Figure 5For example, when charging battery pack A and battery pack B using a generator, relay K1 is closed for battery pack A, and power switch VT1 is turned on. Simultaneously, relay K2 is closed for battery pack B, and power switch VT3 is turned on, allowing the generator to charge battery packs A and B separately. When battery pack A reaches its maximum charge limit, relay K1 is opened, and power switch VT1 is turned off. When battery pack A reaches its maximum charge limit, relay K2 is opened, and power switch VT3 is turned off.

[0087] Similarly, when feeding back to the battery pack via the drive motor, the specific steps are as follows: for each battery pack requiring feedback, the power switch on the input control circuit connected to that battery pack is turned on, and the relay on the connection circuit between the negative terminal of the battery pack and the drive motor is closed. This connects each battery pack in parallel with the drive motor, allowing the drive motor to individually charge each battery pack. After the feedback is complete, the power switch is turned off. Since the battery pack needs to continue discharging, it is not necessary to disconnect the closed relay at this point.

[0088] Similarly, with Figure 5 For example, when the drive motor provides feedback to battery packs A and B, for battery pack A, power switch VT1 is turned on and relay K1 is closed. For battery pack B, power switch VT3 is turned on and relay K2 is closed, thereby driving the motor to provide feedback to battery packs A and B. After the feedback is completed, power switches VT1 and VT3 are turned off. However, to allow battery packs A and B to continue discharging, relays K1 and K2 do not need to be disconnected at this time.

[0089] When a single battery pack is discharging, first close the relay connecting the negative terminal of the battery pack to be discharged to the drive motor. Then, close the pre-charge relay connected to the battery pack to begin pre-charging the X capacitor of the drive motor. After pre-charging is complete, turn on the power switch on the output control circuit connected to the battery pack and disconnect the pre-charge relay to begin discharging to the drive motor.

[0090] For example, with Figure 5 For example, when battery pack A or battery pack B needs to be discharged separately, first close relay K1 for battery pack A or close relay K2 for battery pack B. Then close pre-charge relay Pre-C1 for battery pack A to begin pre-charging. After pre-charging is complete, turn on power switch VT2 connected to battery pack A and turn off pre-charge relay Pre-C1, thus starting battery pack A to discharge. Alternatively, close pre-charge relay Pre-C2 for battery pack B to begin pre-charging. After pre-charging is complete, turn on power switch VT4 connected to battery pack B and turn off pre-charge relay Pre-C2, thus starting battery pack B to discharge.

[0091] When discharging the battery packs in parallel, the relays connecting the negative terminals of each battery pack to be discharged in parallel to the drive motor are closed. Then, the pre-charge relay of the battery pack with the highest voltage is closed, thus initiating pre-charging of the X capacitor of the drive motor. After pre-charging is complete, the power switches on the output control circuits connecting the battery packs to be discharged in parallel are closed, and the closed-loop pre-charge relays are opened, allowing the higher-voltage battery pack to begin discharging. When the voltages of all battery packs are equal, they can be discharged simultaneously in parallel.

[0092] For example, with Figure 5 For example, when parallel discharge is required through battery pack A and battery pack B, first close relay K1 for battery pack A and relay K2 for battery pack B. Then close the pre-charge relay of the battery pack with the higher voltage. After pre-charging is complete, turn on power switches VT2 and VT4, and disconnect the pre-charge relay of the battery pack with the higher voltage. This allows the higher voltage battery pack to begin discharging, and when the voltages of all battery packs are equal, they can be discharged simultaneously in parallel.

[0093] During the battery pack switching process, the relay on the drive motor circuit connected to the negative terminal of the battery pack to be connected can be closed, and the pre-charge relay connected to it can be closed, thereby pre-charging the X capacitor of the drive motor to a voltage similar to that of the battery pack being switched. Then, the power switch on the output control circuit connected to the battery pack is turned on, and its prediction relay is turned off, thereby connecting the battery pack for discharge.

[0094] Then, for battery packs that are depleted and need to be disconnected, disconnect the relay connecting the negative terminal of the battery pack to the drive motor, and turn off the power switch on the output reverse protection circuit connected to the battery pack, thereby disconnecting the battery pack and completing the switching battery pack discharge.

[0095] This application provides a multi-battery pack battery system, including multiple battery packs. Each battery pack is connected in series via a circuit equipped with relays. The positive terminal of each battery pack is connected to a generator, a charging module, and a drive motor via a control circuit module. The negative terminal of each battery pack is connected to another stage of the generator, charging module, and drive motor. A relay is installed on one of the lines connecting each battery pack to the generator. Relays are installed on both lines connecting each battery pack to the charging module. A relay is installed on one of the lines connecting each battery pack to the drive motor. Therefore, by closing and opening the corresponding relays connecting to the charging module, any number of battery packs can be connected in parallel with the charging module. This allows for parallel charging of multiple battery packs via a charging pile connected to the charging module, improving charging efficiency and ensuring relatively consistent voltage across each battery pack during charging, thus contributing to improved overall battery performance and lifespan. Alternatively, any number of adjacent battery packs can be connected in series with the charging module, allowing for series charging of multiple battery packs and achieving high-voltage charging. By closing and opening the corresponding relays connecting the generator, any number of battery packs can be connected to the generator, allowing the generator to use excess power to charge any number of battery packs, thus enabling series or parallel charging of any battery packs. Similarly, by closing and opening the corresponding relays connecting the drive motor, any one or more battery packs can be connected to the drive motor, allowing for parallel discharge of any single battery pack or any number of battery packs. Battery pack switching is also possible, enabling series discharge of a single battery pack or any number of battery packs. Furthermore, the control circuit module prevents circulating currents and facilitates load switching, thus avoiding the generation of circulating currents and ensuring that multiple battery packs can discharge simultaneously. Load switching also allows for switching the discharging battery pack at any time during driving. Therefore, it is not necessary for all battery packs to discharge simultaneously, preventing simultaneous depletion. Load switching of any battery pack ensures that the battery pack can be connected to the vehicle, keeping the vehicle in an economical fuel range and reducing fuel consumption. Moreover, charging can flexibly select multiple battery packs for series or parallel charging, ensuring faster charging. Therefore, the battery system provided in this application can flexibly charge and discharge the battery pack, which can not only reduce the vehicle's fuel consumption, but also effectively meet the needs of various scenarios.

Claims

1. A multi-battery pack battery system, characterized in that, include: Multiple battery packs; Each of the battery packs is connected in series via a circuit equipped with a relay; The positive terminal of each battery pack is connected to the generator, the charging module, and the first stage of the drive motor via a control circuit module, and the negative terminal of each battery pack is connected to the generator, the charging module, and the other stage of the drive motor; wherein, the control circuit module is used to prevent circulating current and load switching; A relay is installed on one of the lines connecting each battery pack to the generator; Each of the two lines connecting the battery pack to the charging module is equipped with a relay. A relay is installed on one of the lines connecting each battery pack to the drive motor.

2. The multi-battery pack battery system according to claim 1, characterized in that, The prevention and control circuit module includes: Parallel input and output control lines; The input control line and the output control line are respectively equipped with a power switch and a reverse protection diode connected in series, and the power switch is connected to the battery pack, and the reverse protection diode is connected to the generator, the charging module and the drive motor respectively; The current flows in different directions in the input control line and the output control line.

3. The battery system with multiple battery packs according to claim 2, characterized in that, The prevention and control circuit module further includes: A pre-charge circuit connected in parallel with the power switch on the output control circuit; The precharge line includes a resistor and a precharge relay connected in series.

4. The battery system with multiple battery packs according to claim 2, characterized in that, The power switch is an insulated gate bipolar transistor.

5. The battery system with multiple battery packs according to claim 1, characterized in that, A relay is installed on the line connecting the negative terminal of each battery pack to the generator.

6. The battery system with multiple battery packs according to claim 5, characterized in that, The charging module is connected to the negative terminal of the battery pack via a relay-equipped circuit that connects the negative terminal of the battery pack to the generator.

7. The battery system with multiple battery packs according to claim 5, characterized in that, Also includes: A current sensor corresponding to each of the battery packs; Each current sensor is connected in series in the connection line between the negative terminal of its corresponding battery pack and the target relay; the target relay is a relay on the line connecting the negative terminal of the battery pack corresponding to the current sensor to the generator.

8. The battery system with multiple battery packs according to claim 5, characterized in that, The drive motor is connected to the negative terminal of each of the battery packs via each target relay; wherein, each target relay is a relay on the line connecting the negative terminal of one of the battery packs to the generator.

9. The battery system with multiple battery packs according to claim 1, characterized in that, Also includes: A fuse connected in series between the positive terminal of each battery pack and the control circuit module.

10. The battery system with multiple battery packs according to claim 1, characterized in that, Each of the relays and the control circuit module is connected to the vehicle controller for control via the vehicle controller.

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