A battery assembly, a battery pack, a battery system and a control method thereof, a drive system, a controller, a vehicle

Abstract

This invention discloses a battery assembly, battery pack, battery system, control method, drive system, controller, and vehicle, relating to the field of electric vehicle technology, and aims to improve the charging and discharging efficiency of the battery assembly. The battery assembly includes multiple battery cells and a switching circuit. The switching circuit is connected to the multiple battery cells, and the switching circuit is used to connect all the battery cells in series and / or in parallel.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle technology, and in particular to a battery component, battery pack, battery system and control method thereof, drive system, controller and vehicle. Background Technology

[0002] With the rise of the new energy vehicle industry, the industry has entered a new stage of large-scale development. Currently, when the required voltage of the battery components used in related technologies is high, it leads to a decrease in the charging and discharging efficiency of the battery components. Summary of the Invention

[0003] The purpose of this invention is to provide a battery component, battery pack, battery system, control method, drive system, controller, and vehicle, with the aim of improving the charging and discharging efficiency of the battery component.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] In a first aspect, the present invention provides a battery assembly comprising: a switching circuit and a plurality of battery cells; the switching circuit is connected to the plurality of battery cells; the switching circuit is used to connect all battery cells in series and / or in parallel.

[0006] Based on the above solutions, some embodiments of this application provide a battery assembly that changes the driving voltage via a switching circuit. By switching the driving voltage of the battery cells, the switching circuit enables the switching of the driving voltage of the battery cells, thereby effectively improving the motor drive efficiency while ensuring the vehicle's power requirements, and thus enhancing the vehicle's range.

[0007] In some embodiments, the battery cell includes a first battery cell and a second battery cell, wherein the negative terminal of the first battery cell is connected to the positive terminal of the second battery cell.

[0008] In some embodiments, the battery unit includes a first battery unit and a second battery unit, wherein the positive electrode of the first battery unit is connected to the positive electrode of the second battery unit, and the negative electrode of the first battery unit is connected to the negative electrode of the second battery unit.

[0009] In some embodiments, the switching circuit includes a first switch, a second switch, and a third switch. A first terminal of the first switch is connected to the positive terminal of the first battery cell, a second terminal of the first switch is connected to the positive terminal of the second battery cell, a first terminal of the second switch is connected to the negative terminal of the first battery cell, a second terminal of the second switch is connected to the positive terminal of the second battery cell, a first terminal of the third switch is connected to the negative terminal of the first battery cell, and a second terminal of the third switch is connected to the negative terminal of the second battery cell.

[0010] In some embodiments, when the second switch is on and the first and third switches are off, the first battery cell and the second battery cell are connected in series.

[0011] In some embodiments, when the second switch is off and the first and third switches are on, the first battery cell and the second battery cell are connected in parallel.

[0012] In some embodiments, the battery cell further includes a third battery cell, the positive terminal of which is connected to the negative terminal of the second battery cell.

[0013] In some embodiments, the battery cell further includes a third battery cell, the positive terminal of which is connected to the positive terminal of the second battery cell, and the negative terminal of which is connected to the negative terminal of the second battery cell.

[0014] In some embodiments, the switching circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, and a sixth switch. A first terminal of the first switch is connected to the positive terminal of the first battery cell. A second terminal of the first switch is connected to the positive terminal of the second battery cell. A first terminal of the second switch is connected to the negative terminal of the first battery cell. A second terminal of the second switch is connected to the positive terminal of the second battery cell. A second terminal of the third switch is connected to the negative terminal of the first battery cell. A first terminal of the fourth switch is connected to the positive terminal of the second battery cell. A second terminal of the fourth switch is connected to the positive terminal of the third battery cell. A first terminal of the fifth switch is connected to the negative terminal of the second battery cell. A second terminal of the fifth switch is connected to the positive terminal of the third battery cell. A first terminal of the sixth switch is connected to the negative terminal of the second battery cell. A second terminal of the sixth switch is connected to the negative terminal of the third battery cell.

[0015] In some embodiments, when the second and fifth switches are on and the first, third, fourth, and sixth switches are off, the first battery cell, the second battery cell, and the third battery cell are connected in series.

[0016] In some embodiments, when the second and fifth switches are off and the first, third, fourth, and sixth switches are on, the first battery cell, the second battery cell, and the third battery cell are connected in parallel.

[0017] In some embodiments, when the first, third, and fifth switches are off and the second, fourth, and sixth switches are on, the second battery unit and the third battery unit are connected in parallel, and the second and third battery units connected in parallel are connected in series with the first battery unit.

[0018] In some embodiments, when the first, third, and fifth switches are on and the second, fourth, and sixth switches are off, the first battery unit and the second battery unit are connected in parallel, and the first and second battery units connected in parallel are connected in series with the third battery unit.

[0019] In some embodiments, the number of third battery cells is N, where N is a positive integer greater than or equal to 2, and the switching circuit is used to connect the first battery cell, the second battery cell, and the third battery cell in series and / or in parallel.

[0020] In some embodiments, when N equals 2, the plurality of third battery cells 23 are connected in series or in parallel; when N is greater than 2, some of the third battery cells 23 are connected in series and / or in parallel with the remaining third battery cells 23.

[0021] Secondly, this application provides a battery pack including a battery assembly as provided in any of the above embodiments.

[0022] The beneficial effects of the second aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0023] In some embodiments, the battery pack is connected to a first DC bus and a second DC bus.

[0024] In some embodiments, the battery pack further includes a seventh switch connected to the first DC bus.

[0025] In some embodiments, an eighth switch and a first resistor are connected in series between the battery assembly and the first DC bus.

[0026] In some embodiments, the eighth switch and the first resistor are connected in series, and the series-connected eighth switch and the first resistor are connected in parallel with the seventh switch.

[0027] In some embodiments, when the seventh switch is on and the eighth switch is off, the battery assembly is connected to the first DC bus to form a power supply circuit; when the seventh switch is off and the eighth switch is on, the battery assembly is connected to the first resistor and the first DC bus to form a pre-charge circuit.

[0028] In some embodiments, the battery pack circuit further includes: a ninth switch; the ninth switch is connected to two DC buses.

[0029] In some embodiments, the seventh switch is a positive contactor, and / or the ninth switch is a negative contactor.

[0030] Thirdly, this application provides a battery system including a battery pack as provided in any of the above embodiments.

[0031] The beneficial effects of the third aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0032] In some embodiments, an energy storage circuit and an inverter circuit are included; wherein both the energy storage circuit and the inverter circuit are connected to a first DC bus and a second DC bus, and the inverter circuit is also used to connect to a motor winding.

[0033] In some embodiments, the energy storage circuit includes a first capacitor; the first capacitor is connected between a first DC bus and a second DC bus.

[0034] In some embodiments, a charging and discharging interface is further included, with a first end of the charging and discharging interface connected to a first DC bus and a second end of the charging and discharging interface connected to a second DC bus. The charging and discharging interface is adapted to be connected to a load or a charging pile.

[0035] In some embodiments, a twelfth switch is also included, one end of which is connected to the motor winding, and the other end of which is connected to the connection between the first DC bus and the first end of the charging / discharging interface.

[0036] In some embodiments, a second capacitor is also included, one end of which is connected to the second DC bus, and the other end of which is connected to the connection between the twelfth switch and the first end of the charging / discharging interface.

[0037] In some embodiments, an eleventh switch is also included, one end of which is connected to the second end of the charging / discharging interface, and the other end is connected to the second capacitor via the second DC bus.

[0038] In some embodiments, a tenth switch is also included, which is connected to the first DC bus and the first end of the tenth switch is connected to the other end of the twelfth switch.

[0039] In some embodiments, a thirteenth switch is also included, which is connected between the motor windings and the battery assembly.

[0040] Fourthly, this application provides a control method for a battery system, applicable to the battery system provided in any of the above embodiments; the battery system includes a charging / discharging interface, which is adapted to be connected to a load or a charging pile.

[0041] The beneficial effects of the fourth aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0042] In some embodiments, the charging and discharging mode of the battery system is determined based on the voltage of the battery assembly and the voltage of the charging and discharging interface of the battery system.

[0043] In some embodiments, during the charging and discharging mode of the battery system, multiple battery cells are connected in series and / or in parallel to adapt to the voltage of the charging and discharging interface.

[0044] In some embodiments, when the voltage of the battery assembly is greater than the voltage of the charging / discharging interface, the battery system is controlled to be in a first mode, the first mode including a boost charging mode and a buck discharging mode.

[0045] In some embodiments, when the voltage of the battery assembly is lower than the voltage of the charging / discharging interface, the battery system is in a second mode, which includes a buck charging mode and a boost discharging mode.

[0046] In some embodiments, when the voltage of the battery assembly is equal to the voltage of the charging / discharging interface, the battery system is in a third mode, which includes a direct charging mode and a direct discharging mode.

[0047] Fifthly, this application provides a drive system including a battery pack as provided in any of the above embodiments, or a battery system as provided in any of the above embodiments.

[0048] The beneficial effects of the fifth aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0049] In a sixth aspect, this application provides a controller, comprising: a processor; and a memory for storing processor-executable instructions; wherein the processor is configured to execute the steps of the control method provided in any of the above embodiments.

[0050] The beneficial effects of the sixth aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0051] In a seventh aspect, this application provides a vehicle including a battery pack as provided in any of the above embodiments, a drive system as provided in the above embodiments, or a controller as provided in the above embodiments.

[0052] The beneficial effects of the seventh aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0053] Eighthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the control method provided in the above embodiments.

[0054] The beneficial effects of the eighth aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here.

[0055] Ninthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the control method provided in the above embodiments.

[0056] The beneficial effects of the ninth aspect and its possible embodiments can be referred to the first aspect, and will not be repeated here. Attached Figure Description

[0057] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0058] Figure 1 This is a structural schematic diagram of a vehicle drive system based on related technologies;

[0059] Figure 2 This is a topology diagram of a battery assembly provided in an embodiment of this application;

[0060] Figure 3 A schematic diagram of a battery assembly with parallel battery drive provided in an embodiment of this application;

[0061] Figure 4 A schematic diagram of a battery series drive for a battery assembly provided in an embodiment of this application;

[0062] Figure 5 This is a topology diagram of another battery assembly provided in an embodiment of this application;

[0063] Figure 6 A schematic diagram of parallel battery drive for another battery assembly provided in an embodiment of this application;

[0064] Figure 7 A schematic diagram of a battery series drive for another battery assembly provided in an embodiment of this application;

[0065] Figure 8A A schematic diagram of a battery series-parallel drive for another battery assembly provided in an embodiment of this application;

[0066] Figure 8B Another schematic diagram of battery series-parallel drive for another battery assembly provided in an embodiment of this application;

[0067] Figure 9 This application provides a topology diagram of a charging system according to an embodiment of the present application.

[0068] Figure 10A structural diagram of a means of transportation provided in an embodiment of this application;

[0069] Figure 11 This application provides a topology diagram of a direct-connect charging system according to an embodiment of the present application.

[0070] Figure 12 A topology diagram of direct charging for another charging system provided in an embodiment of this application;

[0071] Figure 13 This application provides a topology diagram of a boost charging system according to an embodiment of the present application.

[0072] Figure 14 A topology diagram of a boost charging system provided in an embodiment of this application;

[0073] Figure 15 A topology diagram of a boost charging system provided in an embodiment of this application;

[0074] Figure 16 This is a topology diagram of a step-down charging system provided in an embodiment of this application;

[0075] Figure 17 A topology diagram of a buck charging system provided in an embodiment of this application;

[0076] Figure 18 This is a topology diagram of a step-down charging system provided in an embodiment of this application.

[0077] Reference numerals: 100, Battery assembly; 1, Switching circuit; K1, First switch; K2, Second switch; K3, Third switch; K4, Fourth switch; K5, Fifth switch; K6, Sixth switch; K7, Seventh switch; K8, Eighth switch; K9, Ninth switch; K10, Tenth switch; K11, Eleventh switch; K12, Twelfth switch; K13, Thirteenth switch; R1, First resistor; 2, Battery; 21, First battery cell; 22, Second battery cell; 23, Third battery cell; 200, Battery pack; 300, Battery system; 3, Energy storage circuit; 4, Inverter circuit; 41, First bridge arm circuit; 411, First terminal of the first bridge arm circuit; 412, Second terminal of the first bridge arm circuit. ; 413, Third terminal of the first bridge arm circuit; 42, Second bridge arm circuit; 421, First terminal of the second bridge arm circuit; 422, Second terminal of the second bridge arm circuit; 423, Third terminal of the second bridge arm circuit; 43, Third bridge arm circuit; 431, First terminal of the third bridge arm circuit; 432, Second terminal of the third bridge arm circuit; 433, Third terminal of the third bridge arm circuit; 5, First DC bus; 6, Second DC bus; 7, Load; 8, Charging / discharging interface; 81, First terminal of the charging / discharging interface; 82, Second terminal of the charging / discharging interface; C1, First capacitor; C2, Second capacitor; L1, First inductor; 1000, Vehicle; 2000, Charging pile; 3000, Drive system; 4000, Controller. Detailed Implementation

[0078] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0079] In the description of the invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or relative positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Unless otherwise specified, the above-mentioned orientational descriptions can be flexibly set in practical applications, provided that the relative positional relationships shown in the accompanying drawings are satisfied.

[0080] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0081] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a communication between the internal components of two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0082] In embodiments of the invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, 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, 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, article, or apparatus that includes that element.

[0083] In embodiments of the present invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in embodiments of the present invention should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0084] With the rapid development of new energy vehicles and the widespread use of electric vehicles, the demand for the overall power of electric vehicles is also increasing.

[0085] Currently, increasing the overall power of electric vehicles is mainly achieved by increasing the voltage of the battery pack to reduce the supply current. However, as the voltage increases, problems such as decreased motor drive efficiency may arise. For example, if an electric vehicle uses a high-voltage battery pack to directly drive the motor, and this drive voltage cannot be switched, then the drive efficiency of the electric vehicle will decrease when the battery pack voltage is high.

[0086] Reference Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle drive system according to some embodiments of the related technology, including: a battery assembly, a boost electronic control assembly, and a motor assembly. The battery mainly supplies power to the boost electronic control assembly through closed switches S1, S2, S3, and S4. The boost electronic control assembly converts the direct current (DC) power from the battery into alternating current (AC), which then powers the motor assembly to drive the motor. The battery used in this method has a relatively high and fixed voltage. When the battery directly drives the motor with this fixed voltage, it increases the motor speed and torque, thereby increasing the motor's output power. However, if the battery voltage is too high, it increases the motor's energy consumption and reduces drive efficiency, thus affecting the vehicle's range and failing to meet the requirements of both power and efficiency.

[0087] Based on this, embodiments of this application provide a battery assembly 100. For example, as shown... Figure 2 As shown, the battery assembly 100 is used in an electric vehicle, and the battery assembly 100 is connected to the electric vehicle's motor via an inverter circuit 4. The battery assembly 100 includes a switching circuit 1 and multiple battery cells 2. The switching circuit 1 is connected to the multiple battery cells 2 and is used to connect all the battery cells 2 in series and / or in parallel.

[0088] It should be noted that the inverter circuit 4 described above is used to convert the DC voltage in the battery pack 100 into AC voltage, so that the battery pack 100 can output AC voltage to power the motor of the electric vehicle to drive the motor. The switching circuit 1 is used to switch between series and parallel connections of multiple battery cells 2. When the electric vehicle has a high power requirement, multiple battery cells 2 in the battery pack 100 can be connected in series to the input terminal of the inverter circuit 4 to ensure the output power of the motor by increasing the driving voltage of the battery pack 100; when the electric vehicle has a low power requirement, multiple battery cells 2 in the battery pack 100 can be connected in parallel to the input terminal of the inverter circuit 4 to effectively improve the motor driving efficiency while ensuring the output power of the motor, thereby increasing the vehicle's range.

[0089] In summary, some embodiments of this application provide a battery assembly that uses a switching circuit to switch between series and parallel connections of batteries, thereby changing the driving voltage. Furthermore, it enables compatibility between the driving power and driving efficiency of an electric vehicle under high voltage, which means that while ensuring the vehicle's power requirements, it can effectively improve the motor's driving efficiency, thereby increasing the vehicle's range and reducing costs.

[0090] It is understandable that the battery modules in related technologies use a fixed voltage, which cannot achieve series-parallel switching of multiple battery cells within the module. This means that when the required voltage of the battery module is high, the charging and discharging efficiency of the module will decrease. The battery module in this application, while satisfying the need for series-parallel switching of multiple battery cells, can adjust according to charging and discharging requirements. This improves the balance of the battery module and increases its charging and discharging efficiency.

[0091] It should be noted that the aforementioned plurality of battery cells 2 may include at least two battery cells 2.

[0092] In some embodiments, refer to Figure 3 The battery unit 2 includes a first battery unit 21 and a second battery unit 22, with the negative terminal of the first battery unit 21 connected to the positive terminal of the second battery unit 22.

[0093] It is understood that the above connection can connect the first battery unit 21 and the second battery unit 22 in series, so that the voltage of the battery assembly 100 is the first voltage V1.

[0094] In some embodiments, refer to Figure 3 The battery unit 2 includes a first battery unit 21 and a second battery unit 22. The positive terminal of the first battery unit 21 is connected to the positive terminal of the second battery unit 22, and the negative terminal of the first battery unit 21 is connected to the negative terminal of the second battery unit 22.

[0095] It is understood that the above connection can connect the first battery unit 21 and the second battery unit 22 in parallel, so that the voltage of the battery assembly 100 is the second voltage V2, wherein the second voltage V2 is less than the first voltage V1.

[0096] In some embodiments, refer to Figure 3 The switching circuit 1 includes a first switch K1, a second switch K2, and a third switch K3. The first terminal of the first switch K1 is connected to the positive terminal of the first battery unit 21, and the second terminal of the first switch K1 is connected to the positive terminal of the second battery unit 22. The first terminal of the second switch K2 is connected to the negative terminal of the first battery unit 21, and the second terminal of the second switch K2 is connected to the positive terminal of the second battery unit 22. The first terminal of the third switch K3 is connected to the negative terminal of the first battery unit 21, and the second terminal of the third switch K3 is connected to the negative terminal of the second battery unit 22.

[0097] In some embodiments, refer to Figure 4 When the second switch K2 is turned on and the first switch K1 and the third switch K3 are turned off, the first battery unit 21 and the second battery unit 22 are connected in series.

[0098] For example, refer to Figure 4When the first switch K1 and the third switch K3 in the control switch circuit 1 are open and the second switch K2 is open, the voltage of the first battery unit 21 and the second battery unit 22 connected in series is the driving voltage of the battery assembly 100. In other words, when the driving voltage is high, the current consumed by the motor can be increased to ensure the output power of the motor.

[0099] In some embodiments, refer to Figure 3 When the second switch K2 is off and the first switch K1 and the third switch K3 are on, the first battery unit 21 and the second battery unit 22 are connected in parallel.

[0100] For example, refer to Figure 3 When the first switch K1 and the third switch K3 in the control switch circuit 1 are turned on and the second switch K2 is turned off, the voltage of the first battery unit 21 and the second battery unit 22 after being connected in parallel is the driving voltage of the battery assembly 100. This driving voltage is low and can effectively improve the driving efficiency of the motor while meeting the power requirements of the vehicle.

[0101] In some embodiments, refer to Figure 7 Battery unit 2 also includes a third battery unit 23, the positive terminal of which is connected to the negative terminal of the second battery unit 22.

[0102] It is understood that the above connection can connect the first battery unit 21, the second battery unit 22 and the third battery unit 23 in series.

[0103] In other embodiments, reference is made to Figure 6 The battery unit 2 also includes a third battery unit 23, the positive terminal of the third battery unit 23 is connected to the positive terminal of the second battery unit 22, and the negative terminal of the third battery unit 23 is connected to the negative terminal of the second battery unit 22.

[0104] It is understood that the above connection can connect the first battery unit 21, the second battery unit 22 and the third battery unit 23 in parallel.

[0105] In some embodiments, refer to Figure 5The switching circuit 1 includes a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, and a sixth switch K6. In this configuration, the first terminal of the first switch K1 is connected to the positive terminal of the first battery unit 21, the second terminal of the first switch K1 is connected to the positive terminal of the second battery unit 22, the first terminal of the second switch K2 is connected to the negative terminal of the first battery unit 21, and the second terminal of the second switch K2 is connected to the positive terminal of the second battery unit 22, the first terminal of the third switch K3 is connected to the negative terminal of the first battery unit 21, and the second terminal of the third switch K3 is connected to the negative terminal of the second battery unit 22, the first terminal of the fourth switch K4 is connected to the positive terminal of the second battery unit 22, and the second terminal of the fourth switch K4 is connected to the positive terminal of the third battery unit 23, the first terminal of the fifth switch K5 is connected to the negative terminal of the second battery unit 22, and the second terminal of the fifth switch K5 is connected to the positive terminal of the third battery unit 23, and the first terminal of the sixth switch K6 is connected to the negative terminal of the second battery unit 22, and the second terminal of the sixth switch K6 is connected to the negative terminal of the third battery unit 23.

[0106] In some embodiments, refer to Figure 6 When the second switch K2 and the fifth switch K5 are off, and the first switch K1, the third switch K3, the fourth switch K4 and the sixth switch K6 are on, the first battery unit 21, the second battery unit 22 and the third battery unit 23 are connected in parallel.

[0107] For example, refer to Figure 6 When the first switch K1, the third switch K3, the fourth switch K4, and the sixth switch K6 in the control switch circuit 1 are turned on, and the second switch K2 and the fifth switch K5 are turned off, the first battery unit 21, the second battery unit 22, and the third battery unit 23 are connected in parallel to the input terminal of the inverter circuit 4, which can reduce the driving voltage of the battery assembly 100. In other words, the driving voltage can effectively improve the motor driving efficiency while meeting the power requirements of the vehicle.

[0108] In other embodiments, reference is made to Figure 7 When the second switch K2 and the fifth switch K5 are turned on, and the first switch K1, the third switch K3, the fourth switch K4 and the sixth switch K6 are turned off, the first battery unit 21, the second battery unit 22 and the third battery unit 23 are connected in series.

[0109] For example, refer to Figure 7When the first switch K1, the third switch K3, the fourth switch K4, and the sixth switch K6 in the control switch circuit 1 are open, and the second switch K2 and the fifth switch K5 are open, the first battery unit 21 and the second battery unit 22 are connected in series at the input terminal of the inverter circuit 4. This means that by increasing the driving voltage of the battery assembly 100, the current consumed by the motor can be increased, thereby ensuring the output power of the motor.

[0110] In yet other embodiments, reference is made to Figure 8A When the first switch K1, the third switch K3, and the fifth switch K5 are off, and the second switch K2, the fourth switch K4, and the sixth switch K6 are on, the second battery unit 22 and the third battery unit 23 are connected in parallel, and the second battery unit 22 and the third battery unit 23 after being connected in parallel are connected in parallel with the first battery unit 21.

[0111] In some other embodiments, reference is made to Figure 8B When the first switch K1, the third switch K3, and the fifth switch K5 are turned on, and the second switch K2, the fourth switch K4, and the sixth switch K6 are turned off, the first battery unit 21 and the second battery unit 22 are connected in parallel, and the first battery unit 21 and the second battery unit 22 connected in parallel are connected in series with the third battery unit 23.

[0112] For example, refer to Figure 8B In control switch circuit 1, the first switch K1, the third switch K3, and the fifth switch K5 are turned on, while the second switch K2, the fourth switch K4, and the sixth switch K6 are turned off. At this time, the first battery unit 21 is connected in parallel with the second battery unit 22, and then connected in series with the third battery unit 23; refer to Figure 8A When the first switch K1, the third switch K3, and the fifth switch K5 in the control switch circuit 1 are disconnected, the second switch K2, the fourth switch K4, and the sixth switch K6 are turned on, the second battery unit 22 and the third battery unit 23 are connected in parallel, and then connected in parallel with the first battery unit 21. The driving voltage of the battery assembly 100 can be reduced in both of these ways, and the driving voltage can effectively improve the motor driving efficiency while meeting the power requirements of the vehicle.

[0113] For example, the above embodiments are only some examples. Specifically, under the control of the switching circuit 1, two of the three battery cells 2 can be connected in parallel and then connected in series with another battery cell 2, or two of the three battery cells 2 can be connected in series and then connected in parallel with another battery cell 2.

[0114] In some embodiments, the number of third battery cells 23 is N, where N is a positive integer greater than or equal to 2, and the switching circuit 1 is used to connect the first battery cell 21, the second battery cell 22, and the third battery cell 23 in series and / or in parallel.

[0115] For example, when the third battery unit 23 includes N units, the first battery unit 21 and the second battery unit 22 can be connected in series with all N third battery units 23, or the first battery unit 21 and the second battery unit 22 can be connected in parallel with all N third battery units 23, or the first battery unit 21 and the second battery unit 22 can be connected in both series and parallel with the N third battery units 23. Specifically, the first battery unit 21 and the second battery unit 22 can be connected in series and then in parallel with the N third battery units 23, or the first battery unit 21 and the second battery unit 22 can be connected in parallel and then in series with the N third battery units 23, etc., which will not be elaborated here.

[0116] In some embodiments, when N equals 2, the plurality of third battery cells 23 are connected in series or in parallel; when N is greater than 2, the third battery cell 23 among the plurality of third battery cells 23 is connected in series and / or in parallel with the remaining third battery cells 23.

[0117] For example, when N equals 2, multiple third battery units 23 can be connected in series or in parallel at the same time, and then connected in series or in parallel with the first battery unit 21 and the second battery unit 22.

[0118] For example, when N is greater than 2, the third battery unit 23 of the plurality of third battery units 23 may be connected in series with the other third battery units 23, or the third battery unit 23 of the plurality of third battery units 23 may be connected in parallel with the other third battery units 23, or the third battery units 23 of the plurality of third battery units 23 may be connected in series and then connected in parallel with the other third battery units 23, or the third battery units 23 of the plurality of third battery units 23 may be connected in parallel and then connected in series with the other third battery units 23, etc., which will not be described in detail here.

[0119] It should be noted that when the battery assembly 100 includes multiple battery cells 2, the switching circuit can control a portion of the batteries 2 to be connected in series and then in parallel with another portion of the batteries 2, or multiple battery cells 2 to be connected in series and multiple battery cells 2 to be connected in parallel; no specific limitation is made here. In practical applications, the number of battery cells 2 can be selected according to needs and cost considerations. It should also be noted that as the number of third battery cells 23 increases, the voltage of the battery assembly 100 can change with the series and parallel connection relationship between the battery cells 2. That is, when the number of third battery cells 23 increases, the voltage range that the battery assembly 100 can adjust is larger, thereby improving the voltage adaptability of the battery assembly 100 during charging.

[0120] It is understandable that when multiple battery cells 2 are connected in series and parallel, attention needs to be paid to the voltage matching relationship between the battery cells 2. For example, when two battery cells 2 are connected in parallel, it is necessary to ensure that the voltages of the two battery cells 2 are close to each other to avoid a large voltage difference between the two battery cells 2, which would cause the one with the higher voltage to charge the one with the lower voltage.

[0121] It should be explained that the aforementioned switching circuit 1 can be used to control the conversion of the series and parallel voltages of the batteries in the battery pack, thereby changing the driving voltage. In other words, the switching circuit 1 can be adjusted according to the vehicle's power requirements, avoiding the problem of decreased driving efficiency in electric vehicles when the driving voltage is high. This switching of the driving voltage enables compatibility between the driving power and driving efficiency of the electric vehicle under high voltage conditions. That is, it can effectively improve the motor's driving efficiency while ensuring the vehicle's power requirements, thereby increasing the vehicle's range and reducing costs.

[0122] Continue to refer to Figure 9 The embodiments of this application also provide a battery pack 200, including the battery assembly 100 provided in the above embodiments. Therefore, the battery assembly 100 provided by the present invention has all the beneficial effects of the battery assembly 100 provided in any of the above embodiments, which will not be elaborated here.

[0123] In some embodiments, refer to Figure 9 The battery pack 200 is connected to the first DC bus 5 and the second DC bus 6.

[0124] In some embodiments, continue to refer to Figure 9 The battery system 300 also includes: a seventh switch K7, an eighth switch K8, and a first resistor R1; the seventh switch K7 is connected between the battery assembly 100 and the first DC bus 5; the eighth switch K8 and the first resistor R1 are connected in series between the battery assembly 100 and the first DC bus 5.

[0125] For example, the eighth switch K8 and the first resistor R1 are connected in series, and the eighth switch K8 and the first resistor R1 connected in series are connected in parallel with the seventh switch K7.

[0126] In some embodiments, when the seventh switch K7 is on and the eighth switch K8 is off, the battery assembly 100 is connected to the first DC bus 5 to form a power supply circuit; when the seventh switch K7 is off and the eighth switch K8 is on, the battery assembly (100) is connected to the first resistor R1 and the first DC bus 5 to form a pre-charge circuit.

[0127] In some embodiments, continue to refer to Figure 9The battery system 300 also includes: a ninth switch K9; the ninth switch K9 is connected to the second DC bus 6.

[0128] For example, the seventh switch K7 is a positive contactor, and / or the ninth switch K9 is a negative contactor.

[0129] Reference Figure 9 The embodiments of this application also provide a battery system 300, including the battery component 100 provided in the above embodiments. Therefore, the battery component 100 provided by the present invention has all the beneficial effects of the battery component 100 provided in any of the above embodiments, which will not be elaborated here.

[0130] The battery system 300 also includes an energy storage circuit 3 and an inverter circuit 4. Both the energy storage circuit 3 and the inverter circuit 4 are connected to the first DC bus 5 and the second DC bus 6, and the inverter circuit 4 is also used to connect to the motor windings 7.

[0131] In the battery system 300, multiple batteries 2 in the battery assembly 100 can supply power to the energy storage circuit 3, the inverter circuit 4, and the motor winding 7. The energy storage circuit 3 can be used to store electrical energy. (See reference...) Figure 9 The battery assembly 100 includes multiple batteries 2, which is only an example and is not a specific limitation.

[0132] In some embodiments, continue to refer to Figure 9 The energy storage circuit 3 includes a first capacitor C1; the first capacitor C1 is connected between the first DC bus 5 and the second DC bus 6.

[0133] For example, before charging battery 2, the seventh switch K7 needs to be turned off, and the eighth switch K8 and the ninth switch K9 need to be turned on. Battery 2 precharges the first capacitor C1. After the first capacitor C1 is fully charged or nearly fully charged, the eighth switch K8 is turned off, the seventh switch K7 and the ninth switch K9 are turned on, and other switches in the switching circuit are turned on to achieve the purpose of charging battery 2. This can avoid damage to electronic devices caused by voltage jumps during the charging process of the charging pile directly charging battery 2, thereby achieving the purpose of protecting electronic devices.

[0134] In some embodiments, continue to refer to Figure 9The inverter circuit 4 includes a first bridge arm circuit 41 and a second bridge arm circuit 42; the first end 411 of the first bridge arm circuit 41 is connected to the first DC bus 5, the second end 412 of the first bridge arm circuit 41 is connected to the second DC bus 6, and the third end 413 of the first bridge arm circuit 41 is used to connect the motor winding 7; the first end 421 of the second bridge arm circuit 42 is connected to the first DC bus 5, the second end of the second bridge arm circuit 42 is connected to the second DC bus 6, and the third end 423 of the second bridge arm circuit 42 is used to connect the motor winding 7.

[0135] For example, refer to Figure 9 The first end 411 of the first bridge arm circuit 41 is connected to the first DC bus 5. When the seventh switch K7 is turned on, the first end 411 of the first bridge arm circuit 41 receives the electrical signal transmitted by the battery assembly and transmits it to the load through the third end 413 of the first bridge arm circuit 41 so that the motor winding 7 can work normally.

[0136] The aforementioned configuration includes a first bridge arm circuit 41 and a second bridge arm circuit 42. The third terminals 413 and 423 of both the first and second bridge arm circuits are connected to the motor winding 7. This means that when the battery 2 in the battery assembly 100 drives the motor winding 7, current is transmitted through the battery assembly 100 to the first DC bus 5, the first terminal 411 of the first bridge arm circuit 41 to its third terminal 413, the motor winding 7, the third terminal 423 of the second bridge arm circuit 42, and then back to the battery assembly 100 via the second DC bus 6, thus forming a drive loop. It should be noted that when only one first bridge arm circuit 41 is configured in the inverter circuit 4, the current, after flowing through the motor winding 7 via the third terminal 413 of the first bridge arm circuit 41, can also return to the battery assembly 100 along the second terminal 412 of the first bridge arm circuit 41, forming a drive loop.

[0137] In some embodiments, refer to Figure 9 The inverter circuit 4 also includes a third bridge arm circuit 43. The first end 431 of the third bridge arm circuit 43 is connected to the first DC bus 5, the second end 432 of the third bridge arm circuit 43 is connected to the second DC bus 6, and the third end 433 of the third bridge arm circuit 43 is used to connect the motor winding 7.

[0138] For example, refer to Figure 9 The third terminal 433 of the third bridge arm circuit 43 in the inverter circuit 4 is used to connect the motor winding 7. That is, in the drive circuit, the current flows from the first terminal 411 of the first bridge arm circuit 41 to the third terminal, and after flowing through the motor winding 7, it can return to the battery assembly 100 through the third terminal 433 of the third bridge arm circuit 43 to form a drive circuit.

[0139] In some embodiments, continue to refer to Figure 9 The battery system 300 also includes a charging and discharging interface 8. The first end 81 of the charging and discharging interface 8 is connected to the first DC bus 5, and the second end 82 of the charging and discharging interface 8 is connected to the second DC bus 6. The charging and discharging interface 8 is adapted to be connected to a load or a charging pile 2000.

[0140] For example, the charging and discharging interface 8 includes a first end 81 and a second end 82. The first end 81 of the charging and discharging interface 8 is used to connect to the positive terminal of the charging pile 2000, and the second end of the charging and discharging interface 8 is used to connect to the negative terminal of the charging pile 2000. The first DC bus 5 receives the positive signal of the charging pile 2000 through the first end 81 of the charging and discharging interface 8, and the second DC bus 6 transmits electrical signals to the negative terminal of the charging pile 2000 through the second end 82 of the charging and discharging interface 8.

[0141] In some embodiments, continue to refer to Figure 9 It also includes a twelfth switch K12, one end of which is connected to the motor winding 7, and the other end of which is connected to the connection between the first DC bus (5) and the first end (81) of the charging and discharging interface (8).

[0142] For example, when the twelfth switch K12 is turned on, the twelfth switch K12 can transmit the electrical signal received at the first end of the charging and discharging interface 8 to the motor winding 7 to charge the motor winding 7.

[0143] In some embodiments, continue to refer to Figure 9 The battery system 300 also includes a second capacitor C2, one end of which is connected to the second DC bus 6, and the other end of which is connected to the connection point between the twelfth switch K12 and the first end 81 of the charging and discharging interface 8.

[0144] For example, during the charging process of the charging pile 2000 charging the battery 2 in the battery assembly 100, and when the eleventh switch K11 is turned on, the second capacitor C2 can be used to store part of the electrical energy so that the voltage of the charging pile 2000 is adapted to the voltage of the battery assembly 2.

[0145] In some embodiments, continue to refer to Figure 9 The battery system 300 also includes an eleventh switch K11, one end of which is connected to the second end 82 of the charging and discharging interface 8, and the other end is connected to the second capacitor C2 through the second DC bus 6.

[0146] For example, when the eleventh switch K11 is turned on, the eleventh switch K11 can transmit the electrical signal received by the first DC bus 5 to the charging pile 2000 through the second terminal 82 of the charging and discharging interface 8.

[0147] In some embodiments, continue to refer to Figure 9 The battery system 300 also includes a tenth switch K10, which is connected to the first DC bus 5, and the tenth switch K10 is connected to the first end 81 of the charging and discharging interface 8 and the other end of the twelfth switch K12.

[0148] For example, when the tenth switch K10 is turned on, the tenth switch K10 can transmit the electrical signal received at the first end of the charging and discharging interface 8 to the first DC bus 5.

[0149] In some embodiments, continue to refer to Figure 9 It also includes a thirteenth switch K13, which is connected between the motor winding 7 and the battery assembly 100.

[0150] For example, the motor winding 7 includes a first inductor L1; the first end of the first inductor L1 is connected to the inverter circuit 4, and the second end of the first inductor L1 is connected to the battery assembly 100 through the thirteenth switch K13.

[0151] For example, when the tenth switch K10 and the thirteenth switch K13 are turned on, the first end of the first inductor L1 can receive the electrical signal transmitted by the inverter circuit 4 and input it to the battery 2 in the battery assembly 100 along the second end of the first inductor L1.

[0152] For example, refer to Figure 9 The neutral end of motor winding 7 is connected to the twelfth switch K12.

[0153] like Figure 9 As shown, embodiments of this application also provide a control method for a battery system 300, which is applied to the battery system 300 provided in any of the above embodiments. Therefore, the control method for the battery system 300 provided by the present invention has all the beneficial effects of the battery system 300 provided in any of the above embodiments, and will not be elaborated here.

[0154] The battery system 300 includes a charge / discharge interface 8, which is adapted to be connected to a load or a charging station (2000).

[0155] The control method of the battery system 300 includes: determining the charging and discharging mode of the battery system 300 based on the voltage of the battery component 100 and the voltage of the charging and discharging interface 8.

[0156] In the charging and discharging mode of the battery system 300, multiple battery cells 2 are connected in series and / or in parallel to adapt to the voltage of the charging and discharging interface 8.

[0157] In some embodiments, when the voltage of the battery assembly 100 is greater than the voltage of the charging / discharging interface 8, the battery system 300 is in a first mode, which includes a boost charging mode and a buck discharging mode.

[0158] It should be noted that when the charging / discharging interface 8 is connected to the load, the first mode is a buck discharge mode, and when the charging / discharging interface 8 is connected to the charging pile, the first mode is a boost charging mode.

[0159] In some embodiments, when the voltage of the battery assembly 100 is less than the voltage of the charging / discharging interface 8, the battery system 300 is in a second mode, which includes a buck charging mode and a boost discharging mode.

[0160] It should be noted that when the charging / discharging interface 8 is connected to the load, the second mode is a boost discharge mode; when the charging / discharging interface 8 is connected to the charging pile, the second mode is a buck charging mode.

[0161] In some embodiments, when the voltage of the battery assembly 100 is equal to the voltage of the charging / discharging interface 8, the battery system 300 is in a third mode, which includes a direct charging mode and a direct discharging mode.

[0162] It should be noted that when the charging / discharging interface 8 is connected to the load, the third mode is a direct discharge mode; when the charging / discharging interface 8 is connected to the charging pile, the third mode is a direct charging mode.

[0163] The following details the specific connection methods for each mode. The connection method for the buck discharge mode in the first mode is the same as that for the boost charging mode described below. The connection method for the boost discharge mode in the second mode is the same as that for the buck charging mode described below. The connection method for the direct discharge mode in the third mode is the same as that for the direct charging mode.

[0164] For example, when the voltage of the battery assembly 100 is greater than the voltage of the charging / discharging interface 8, the battery system 300 is controlled to enter a boost charging mode; when the voltage of the battery assembly 100 is less than the voltage of the charging / discharging interface 8, the battery system 300 is controlled to enter a buck charging mode; and when the voltage of the battery assembly 100 is equal to the voltage of the charging / discharging interface 8, the battery system 300 is controlled to enter a direct charging mode.

[0165] Understandably, the charging / discharging interface 8 is suitable for connection to the charging pile 2000. During charging, the voltage of the charging / discharging interface 8 is the same as the voltage of the charging pile 2000. Since the charging pile 2000 is typically a DC charging pile, when the charging pile 2000 charges the battery cells 2 in the battery pack 100, the charging efficiency of the charging pile is higher if its voltage range is consistent with that of the battery pack 100. However, when the voltage of the battery pack 100 differs significantly from the voltage collected by the charging pile, the charging efficiency of the charging pile 2000 will decrease, resulting in greater power consumption loss.

[0166] The charging / discharging interface 8 is suitable for connection to a load. During the discharge process, the voltage of the charging / discharging interface 8 is the same as the voltage across the load. For example, if the voltage of the battery module 100 is 500V and the voltage across the load is 300V, the voltage of the battery module 100 and the voltage across the load will differ significantly, which will lead to a decrease in the discharge efficiency of the battery module 100 and a large power loss.

[0167] The battery system 300 described above can not only drive the motor, but also perform direct charging, boost charging, and buck charging. When the battery system 300 is used in conjunction with the charging pile 2000, the charging system can be adapted to more usage environments to meet different needs.

[0168] In some embodiments, refer to Figure 11 and Figure 12 The control switch circuit 1 connects the battery cells 2 in the battery assembly 100 in series, forming a first charging circuit in the battery system 300, and the voltage of the battery assembly 100 is a first voltage V1; the control switch circuit 1 also connects the battery cells 2 in the battery assembly 100 in parallel, forming a second charging circuit in the battery system 300, and the voltage of the battery assembly 100 is a second voltage V2; wherein, the first voltage V1 is greater than the second voltage V2.

[0169] For example, when the first voltage V1 is compatible with the voltage of the charging / discharging interface 8, the battery assembly 100 can control the switching circuit 1 to make the voltage of the multiple batteries 2 the first voltage V1, thereby achieving direct charging; when the second voltage V2 is compatible with the voltage of the charging / discharging interface 8, the battery assembly 100 can control the switching circuit 1 to make the voltage of the multiple batteries 2 the second voltage V2, thereby achieving direct charging; when neither the first voltage V1 nor the second voltage V2 is compatible with the voltage of the charging / discharging interface 8, the voltage of the battery assembly 100 can be matched with the voltage of the charging / discharging interface 8 by adjusting the opening and closing of a switch other than the switching circuit 1, for example, by having the charging pile charge the load first.

[0170] It should be noted that the voltage of the charging pile 2000 can be a range value. In other words, as long as the voltage of the battery pack 100 is within this range, direct charging mode can be achieved.

[0171] The following describes the charging control method for a charging system, taking a battery assembly consisting of a first battery and a second battery as an example. When the battery assembly in the charging system comprises multiple batteries, charging is implemented using the charging control method described below, which will not be elaborated upon here.

[0172] In some embodiments, refer to Figure 11 When the voltage of the battery assembly 100 is the first voltage V1, and the first voltage V1 is equal to the voltage of the charging and discharging interface 8, the battery system 300 is in the first direct-connect charging mode. The tenth switch K10, the seventh switch K7, the second switch K2, the ninth switch K9 and the eleventh switch K11 are turned on. The current flows from the first end of the charging and discharging interface 8, through the first DC bus 5, the battery assembly 100 and the second DC bus 6, to the second end of the charging and discharging interface 8. The battery system 300 forms the first charging circuit, which is the first direct-connect charging circuit.

[0173] Reference Figure 12 When the voltage of the battery assembly 100 is the second voltage V2, and the second voltage V2 is equal to the voltage of the charging and discharging interface 8, the tenth switch K10, the seventh switch K7, the first switch K1, the third switch K3, the ninth switch K9 and the eleventh switch K11 are turned on. The current flows from the first end of the charging and discharging interface 8, through the first DC bus 5, the battery assembly 100 and the second DC bus 6, to the second end of the charging and discharging interface 8. The battery system 300 forms a second charging circuit, which is a second direct-connected charging circuit.

[0174] It should be noted that, as described above, when the first battery unit 21 and the second battery unit 22 are connected in series, the voltage of the battery assembly 100 is a first voltage V1; when the first battery unit 21 and the second battery unit 22 are connected in parallel, the voltage of the battery assembly 100 is a second voltage V2. In other words, by controlling the switching circuit 1 to switch between the series and parallel connections of the first battery unit 21 and the second battery unit 22, voltage conversion can be achieved, thereby realizing the aforementioned direct charging mode. This configuration increases the compatibility between the voltage of the battery assembly 100 and the charging pile 2000.

[0175] When the voltage range provided by the charging pile 2000 (i.e., the upper limit of the power supply voltage of the charging pile 2000) is less than the voltage required by the battery module 100, the power supply voltage provided by the charging pile 2000 needs to be boosted and converted by the battery system 300 so that the voltage after the boost conversion by the battery system 300 is consistent with the voltage required by the battery module 100, thereby improving charging efficiency.

[0176] The boost control cycle of the battery system 300 includes two timing sequences:

[0177] First sequence, refer to Figure 13 The twelfth switch K12, the eleventh switch K11, and the lower bridge tube 41b of the first bridge arm circuit 41 are turned on to form the first boost circuit. This allows the current output from the positive terminal of the charging pile 2000 to flow back to the negative terminal of the charging pile 2000 through the first inductor L1 of the motor winding 7 and the lower bridge tube 41b of the first bridge arm circuit 41, so as to enable the charging pile 2000 to charge the first inductor L1.

[0178] Second time sequence, refer to Figure 14 The twelfth switch K12, the upper bridge tube 41a of the first bridge arm circuit 41, the seventh switch K7, the ninth switch K9, and the eleventh switch K11 are turned on to form a second boost circuit. This allows the current output from the positive terminal of the charging pile 2000 to flow back to the negative terminal of the charging pile 2000 through the first inductor L1 of the motor winding 7, the upper bridge tube 41a of the first bridge arm circuit 41, the first DC bus 5, the battery assembly 100, and the second DC bus 6, so that the charging pile 2000 can charge the battery 2 in the battery assembly 100.

[0179] In some embodiments, refer to Figure 14 When the voltage of the battery assembly 100 is the first voltage V1, and the voltage of the charging / discharging interface 8 is greater than the second voltage V2 and less than the first voltage V1, the battery system 300 enters the boost charging mode. The twelfth switch K12, the seventh switch K7, the second switch K2, the ninth switch K9, and the eleventh switch K11 are turned on. The current flows from the first end of the charging / discharging interface 8, through the first inductor L1 of the motor winding 7, the inverter circuit 4, the first DC bus 5, the battery assembly 100, and the second DC bus 6, to the second end of the charging / discharging interface 8. The battery system 300 forms the first charging circuit, which is a series boost charging circuit.

[0180] For example, the series boost charging circuit is formed by combining the above-mentioned second boost circuit with multiple battery cells 2 in the battery assembly 100 in series. This configuration can increase the compatibility between the voltage of the battery assembly 100 and the charging pile 2000 to a greater extent.

[0181] In some embodiments, refer to Figure 15When the voltage of the battery assembly 100 is the second voltage V2, and the voltage of the charging / discharging interface 8 is less than the second voltage V2, the battery system 300 enters the boost charging mode. The twelfth switch K12, the seventh switch K7, the first switch K1, the third switch K3, the ninth switch K9, and the eleventh switch K11 are turned on. The current flows from the first end of the charging / discharging interface 8, through the first inductor L1 of the motor winding 7, the inverter circuit 4, the first DC bus 5, the battery assembly 100, and the second DC bus 6, to the second end of the charging / discharging interface 8. The battery system 300 forms a second charging circuit, which is a parallel boost charging circuit.

[0182] For example, the series boost charging circuit is formed by combining the above-mentioned second boost circuit with multiple battery cells 2 in the battery assembly 100 connected in parallel. This configuration can increase the compatibility between the voltage of the battery assembly 100 and the charging pile 2000 to a greater extent.

[0183] When the voltage range provided by the charging pile 2000 (i.e., the lower limit of the power supply voltage of the charging pile 2000) is greater than the voltage required by the battery module 100, the power supply voltage provided by the charging pile 2000 needs to be stepped down and converted by the battery system 300 so that the voltage after step-down conversion by the battery system 300 is consistent with the voltage required by the battery module 100, so as to avoid the charging voltage being too high and causing damage to the battery 2 in the battery module 100.

[0184] The buck control cycle of the battery system 300 includes two timing sequences:

[0185] First sequence, refer to Figure 16 The system controls the conduction of the tenth switch K10, the upper bridge transistor 41a of the first bridge arm circuit 41, the thirteenth switch K13, the ninth switch K9, and the eleventh switch K11, forming a first step-down circuit. This allows the current output from the positive terminal of the charging pile 2000 to flow sequentially through the upper bridge transistor 41a of the first bridge arm circuit 41, the first inductor L1 of the motor winding 7, and the battery pack 100 before returning to the negative terminal of the charging pile 2000. This enables the charging pile 2000 to charge the battery 22 of the battery pack 100 and the first inductor L1. Since the first inductor L1 is connected in series with the battery pack 100, the voltage across the battery pack 100 is lower than the supply voltage of the charging pile 2000, allowing the charging pile 2000 to perform step-down charging of the battery 22 of the battery pack 100.

[0186] Second time sequence, refer to Figure 17The control switches K13 and K9, and the lower bridge tube 41b of the first bridge arm circuit 41 are turned on to form a second step-down circuit. This allows the current of the first inductor L1 of the motor winding 7 to flow back to the first inductor L1 through the first DC bus 5, the battery pack 100, the second DC bus 6, and the lower bridge tube 41b of the first bridge arm circuit 41, so that the first inductor L1 can charge the battery 2 in the battery pack 100, in order to cooperate with the charging pile 2000 to complete the step-down charging process.

[0187] It should be noted that the first inductor L1 has a freewheeling function, and the current direction will not change abruptly. During the charging process, by adjusting the switching frequency of the upper bridge transistor 41a and the lower bridge transistor 41b of the first bridge arm circuit 41, the charging voltage at both ends of the battery 22 of the battery assembly 100 is made less than the power supply voltage of the charging pile 2000, so as to achieve the effect of step-down charging.

[0188] In some embodiments, refer to Figure 16 When the voltage of the battery assembly 100 is the first voltage V1, and the voltage of the charging / discharging interface 8 is greater than the second voltage V2 and less than the first voltage V1, the tenth switch K10, the thirteenth switch K13, the second switch K2, the ninth switch K9 and the eleventh switch K11 are turned on. The current flows from the first end of the charging / discharging interface 8, through the first DC bus 5, the inverter circuit 4, the first inductor L1 of the motor winding 7, the battery assembly 100, the second DC bus 6, to the second end of the charging / discharging interface 8. The battery system 300 forms a first charging circuit, which is a series step-down charging circuit.

[0189] For example, the series step-down charging circuit is formed by combining the first step-down circuit with multiple battery cells 2 in the battery assembly 100 in series. This configuration can improve the compatibility between the voltage of the battery assembly 100 and the charging pile 2000 to a greater extent.

[0190] In some embodiments, refer to Figure 18 When the voltage of the battery assembly 100 is the second voltage V2, and the voltage of the charging / discharging interface 8 is greater than the second voltage V2 and less than the first voltage V1, the tenth switch K10, the thirteenth switch K13, the first switch K1, the third switch K3, the ninth switch K9 and the eleventh switch K11 are turned on. The current flows from the first end of the charging / discharging interface 8, through the first DC bus 5, the inverter circuit 4, the first inductor L1 of the motor winding 7, the battery assembly 100, the second DC bus 6, to the second end of the charging / discharging interface 8. The battery system 300 forms a second charging circuit, which is a parallel step-down charging circuit.

[0191] For example, the parallel step-down charging circuit is formed by combining the first step-down circuit with multiple batteries 2 in the battery pack 100 in parallel. This configuration can improve the compatibility between the voltage of the battery pack 100 and the charging pile 2000 to a greater extent.

[0192] It should be noted that the above circuits are all based on the first bridge arm circuit 41 as an example to introduce the buck-boost circuit. This is only one example. The first bridge arm circuit 41 here can also be the first bridge arm circuit 41, the second bridge arm circuit 42, or the third bridge arm circuit 43.

[0193] In this embodiment, by controlling the on / off state of multiple switches and the on / off state of the upper and lower bridge transistors in the inverter circuit 4, a charging system with a battery system 300 can switch between three modes: drive control mode, direct charging mode, and boost charging mode. The circuit structure is simple, the size is small, the cost is low, and it can meet different needs.

[0194] Reference Figure 9 Embodiments of this application also provide a drive system 1000, including the battery pack 200 as provided in the above embodiments, or including the battery system 300 as provided in the above embodiments. Therefore, the drive system 1000 provided by the present invention has all the beneficial effects of the battery pack 200 and the battery system 300 provided in any of the above embodiments, which will not be elaborated here.

[0195] Reference Figure 10 The embodiments of this application also provide a controller 4000, which includes a processor and a memory for storing processor-executable instructions; wherein the processor is configured to execute the steps of the control method of the battery system 300 provided in the above embodiments. Therefore, the controller 4000 provided by the present invention has all the beneficial effects of the control method of the battery system 300 provided in any of the above embodiments, which will not be elaborated here.

[0196] For example, the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor.

[0197] The memory can be read-only memory (ROM) or other types of static storage devices capable of storing static information and instructions, random access memory (RAM) or other types of dynamic storage devices capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited to these. The memory can exist independently and be connected to the processor via a communication bus. The memory can also be integrated with the processor.

[0198] Reference Figure 10 The embodiments of this application also provide a vehicle 3000, including the battery system 300 provided in the above embodiments. Therefore, the battery system 300 provided by the present invention has all the beneficial effects of the battery system 300 provided in any of the above embodiments, which will not be elaborated here.

[0199] The embodiments of this application also provide a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the steps of the control method of the battery system 300 provided in the above embodiments. Therefore, the computer-readable storage medium provided by the present invention has all the beneficial effects of the control method of the battery system 300 provided in any of the above embodiments, which will not be elaborated here.

[0200] The embodiments of this application also provide a computer program product including a computer program that, when executed by a processor, implements the steps of the control method for the battery system 300 provided in the above embodiments. Therefore, the computer program product provided by the present invention has all the beneficial effects of the control method for the battery system 300 provided in any of the above embodiments, which will not be elaborated here.

[0201] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0202] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A battery assembly (100), characterized in that, The battery assembly (100) includes: Multiple battery cells (2); A switching circuit (1) is connected to a plurality of battery cells (2) and the switching circuit (1) is used to connect all of the battery cells (2) in series and / or in parallel.

2. The battery assembly (100) according to claim 1, characterized in that, The battery unit (2) includes a first battery unit (21) and a second battery unit (22), wherein the negative electrode of the first battery unit (21) is connected to the positive electrode of the second battery unit (22).

3. The battery assembly (100) according to claim 1, characterized in that, The battery unit (2) includes a first battery unit (21) and a second battery unit (22). The positive electrode of the first battery unit (21) is connected to the positive electrode of the second battery unit (22), and the negative electrode of the first battery unit (21) is connected to the negative electrode of the second battery unit (22).

4. The battery assembly (100) according to claim 2 or 3, characterized in that, The switching circuit (1) includes a first switch (K1), a second switch (K2), and a third switch (K3); The first end of the first switch (K1) is connected to the positive terminal of the first battery cell (21), and the second end of the first switch (K1) is connected to the positive terminal of the second battery cell (22). The first end of the second switch (K2) is connected to the negative terminal of the first battery cell (21), and the second end of the second switch (K2) is connected to the positive terminal of the second battery cell (22). The first end of the third switch (K3) is connected to the negative terminal of the first battery cell (21), and the second end of the third switch (K3) is connected to the negative terminal of the second battery cell (22).

5. The battery assembly (100) according to claim 4, characterized in that, When the second switch (K2) is on and the first switch (K1) and the third switch (K3) are off, the first battery cell (21) and the second battery cell (22) are connected in series.

6. The battery assembly (100) according to claim 4, characterized in that, When the second switch (K2) is off and the first switch (K1) and the third switch (K3) are on, the first battery cell (21) and the second battery cell (22) are connected in parallel.

7. The battery assembly (100) according to claim 2, characterized in that, The battery unit (2) further includes a third battery unit (23), the positive electrode of which is connected to the negative electrode of the second battery unit (22).

8. The battery assembly (100) according to claim 3, characterized in that, The battery unit (2) further includes a third battery unit (23), the positive electrode of the third battery unit (23) is connected to the positive electrode of the second battery unit (22), and the negative electrode of the third battery unit (23) is connected to the negative electrode of the second battery unit (22).

9. The battery assembly (100) according to claim 7 or 8, characterized in that, The switching circuit (1) includes a first switch (K1), a second switch (K2), a third switch (K3), a fourth switch (K4), a fifth switch (K5), and a sixth switch (K6); The first end of the first switch (K1) is connected to the positive terminal of the first battery cell (21), and the second end of the first switch (K1) is connected to the positive terminal of the second battery cell (22). The first end of the second switch (K2) is connected to the negative terminal of the first battery cell (21), and the second end of the second switch (K2) is connected to the positive terminal of the second battery cell (22). The first end of the third switch (K3) is connected to the negative terminal of the first battery cell (21), and the second end of the third switch (K3) is connected to the negative terminal of the second battery cell (22). The first end of the fourth switch (K4) is connected to the positive terminal of the second battery unit (22), and the second end of the fourth switch (K4) is connected to the positive terminal of the third battery unit (23). The first end of the fifth switch (K5) is connected to the negative terminal of the second battery unit (22), and the second end of the fifth switch (K5) is connected to the positive terminal of the third battery unit (23). The first end of the sixth switch (K6) is connected to the negative terminal of the second battery unit (22), and the second end of the sixth switch (K6) is connected to the negative terminal of the third battery unit (23).

10. The battery assembly (100) according to claim 9, characterized in that, When the second switch (K2) and the fifth switch (K5) are turned on, and the first switch (K1), the third switch (K3), the fourth switch (K4) and the sixth switch (K6) are turned off, the first battery unit (21), the second battery unit (22) and the third battery unit (23) are connected in series.

11. The battery assembly (100) according to claim 9, characterized in that, When the second switch (K2) and the fifth switch (K5) are off, and the first switch (K1), the third switch (K3), the fourth switch (K4) and the sixth switch (K6) are on, the first battery unit (21), the second battery unit (22) and the third battery unit (23) are connected in parallel.

12. The battery assembly (100) according to claim 9, characterized in that, When the first switch (K1), the third switch (K3), and the fifth switch (K5) are off, and the second switch (K2), the fourth switch (K4), and the sixth switch (K6) are on, the second battery unit (22) and the third battery unit (23) are connected in parallel, and the second battery unit (22) and the third battery unit (23) connected in parallel are connected in series with the first battery unit (21).

13. The battery assembly (100) according to claim 9, characterized in that, When the first switch (K1), the third switch (K3), and the fifth switch (K5) are turned on, and the second switch (K2), the fourth switch (K4), and the sixth switch (K6) are turned off, the first battery unit (21) and the second battery unit (22) are connected in parallel, and the first battery unit (21) and the second battery unit (22) connected in parallel are connected in series with the third battery unit (23).

14. The battery assembly (100) according to claim 7 or 8, characterized in that, The number of the third battery unit (23) is N, where N is a positive integer greater than or equal to 2. The switching circuit (1) is used to connect the first battery unit (21), the second battery unit (22), and the third battery unit (23) in series and / or in parallel.

15. The battery assembly (100) according to claim 14, characterized in that, When N equals 2, the multiple third battery cells (23) are connected in series or in parallel; When N is greater than 2, some of the third battery cells (23) are connected in series and / or in parallel with the remaining third battery cells (23).

16. A battery pack (200), characterized in that, Includes the battery assembly (100) as described in any one of claims 1-15.

17. The battery pack (200) according to claim 16, characterized in that, The battery pack (200) is connected to the first DC bus (5) and the second DC bus (6).

18. The battery pack (200) according to claim 17, characterized in that, The battery pack (200) also includes a seventh switch (K7), which is connected to the first DC bus (5).

19. The battery pack (200) according to claim 18, characterized in that, The battery pack (200) further includes an eighth switch (K8) and a first resistor (R1), which are connected in series between the battery assembly (100) and the first DC bus (5).

20. The battery pack (200) according to claim 19, characterized in that, The eighth switch (K8) is connected in series with the first resistor (R1), and the eighth switch (K8) and the first resistor (R1) connected in series are connected in parallel with the seventh switch (K7).

21. The battery pack (200) according to claim 20, characterized in that, When the seventh switch (K7) is on and the eighth switch (K8) is off, the battery assembly (100) is connected to the first DC bus (5) to form a power supply circuit; when the seventh switch (K7) is off and the eighth switch (K8) is on, the battery assembly (100) is connected to the first resistor (R1) and the first DC bus (5) to form a pre-charge circuit.

22. The battery pack (200) according to any one of claims 18-21, characterized in that, The battery pack (200) also includes a ninth switch (K9) connected to the second DC bus (6).

23. The battery pack (200) according to claim 22, characterized in that, The seventh switch (K7) is a positive contactor, and / or the ninth switch (K9) is a negative contactor.

24. A battery system (300), characterized in that, Includes the battery pack (200) as described in any one of claims 16-23.

25. The battery system (300) according to claim 24, characterized in that, It also includes an energy storage circuit (3) and an inverter circuit (4); wherein the energy storage circuit (3) and the inverter circuit (4) are both connected to the first DC bus (5) and the second DC bus (6), and the inverter circuit (4) is also used to connect the motor windings (7).

26. The battery system (300) according to claim 25, characterized in that, The energy storage circuit (3) includes a first capacitor (C1); the first capacitor (C1) is connected between the first DC bus (5) and the second DC bus (6).

27. The battery system (300) according to claim 25, characterized in that, It also includes a charging and discharging interface (8), the first end (81) of which is connected to the first DC bus (5), the second end (82) of which is connected to the second DC bus (6), and the charging and discharging interface (8) is adapted to be connected to a load or a charging pile (2000).

28. The battery system (300) according to claim 27, characterized in that, It also includes a twelfth switch (K12), one end of which is connected to the motor winding (7), and the other end of which is connected to the connection between the first DC bus (5) and the first end (81) of the charging and discharging interface (8).

29. The battery system (300) according to claim 28, characterized in that, It also includes a second capacitor (C2), one end of which is connected to the second DC bus (6), and the other end of which is connected to the connection between the twelfth switch (K12) and the first end (81) of the charging and discharging interface (8).

30. The battery system (300) according to claim 29, characterized in that, Also includes: The eleventh switch (K11) has one end connected to the second end (82) of the charging and discharging interface (8), and the other end connected to the second capacitor (C2) through the second DC bus (6).

31. The battery system (300) according to claim 28, characterized in that, Also includes: The tenth switch (K10) is connected to the first DC bus (5), and the tenth switch (K10) is connected to the first end (81) of the charging and discharging interface (8) and the other end of the twelfth switch (K12).

32. The battery system (300) according to claim 25, characterized in that, It also includes a thirteenth switch (K13) connected between the motor winding (7) and the battery assembly (100).

33. A control method for a battery system (300), characterized in that, The battery system (300) includes any one of claims 24-32, the battery system (300) including a charge / discharge interface (8) adapted to be connected to a load or a charging pile (2000).

34. The control method for the battery system (300) according to claim 33, characterized in that, The charging and discharging mode of the battery system (300) is determined based on the voltage of the battery assembly (100) and the voltage of the charging and discharging interface (8).

35. The control method for the battery system (300) according to claim 34, characterized in that... In the charging and discharging mode of the battery system (300), multiple battery cells (2) are connected in series and / or in parallel to adapt to the voltage of the charging and discharging interface (8).

36. The control method for the battery system (300) according to claim 34 or 35, characterized in that, When the voltage of the battery assembly (100) is greater than the voltage of the charging / discharging interface (8), the battery system (300) is in a first mode, which includes a boost charging mode and a buck discharging mode.

37. The control method for the battery system (300) according to claim 34 or 35, characterized in that, When the voltage of the battery assembly (100) is less than the voltage of the charging / discharging interface (8), the battery system (300) is in a second mode, which includes a buck charging mode and a boost discharging mode.

38. The control method for the battery system (300) according to claim 34 or 35, characterized in that, When the voltage of the battery assembly (100) is equal to the voltage of the charging / discharging interface (8), the battery system (300) is in a third mode, which includes a direct charging mode and a direct discharging mode.

39. A drive system (1000), characterized in that, Includes the battery pack (200) according to any one of claims 16-23, or the battery system (300) according to any one of claims 24-32.

40. A controller (4000), characterized in that, The controller (4000) includes: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to: perform the steps of the control method according to any one of claims 33-38.

41. A means of transportation (3000), characterized in that, It includes the battery pack (200) of any one of claims 16-23, the drive system of claim 39, or the controller of claim 40.

42. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the control method according to any one of claims 33-38.

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