Battery device, power utilization device and energy storage device

Abstract

The utility model provides a battery device, a power utilization device and an energy storage device, and belongs to the technical field of batteries. The battery device comprises a first battery pack, a second battery pack and a switch assembly, the switch assembly comprises a first single-pole double-throw switch and a second single-pole double-throw switch, the first single-pole double-throw switch can be selectively switched between a first state and a second state, and the second single-pole double-throw switch can be selectively switched between a third state and a fourth state; when the first single-pole double-throw switch is in a first state and the second single-pole double-throw switch is in a third state, the first battery pack and the second battery pack are connected in parallel between the first output terminal and the second output terminal; when the first single-pole double-throw switch is in the second state and the second single-pole double-throw switch is in the fourth state, the first battery pack and the second battery pack are connected in series between the first output terminal and the second output terminal. The short circuit problem of the battery device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device, a power utilization device and an energy storage device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of society. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the related art, the battery is usually controlled by a control switch to control its working state. However, in the case of accidental touch of the control switch, the battery is prone to short circuit or overcurrent. Therefore, how to improve the short circuit or overcurrent problem of the battery has always been the key to research. CONTENT OF THE INVENTION

[0004] The present application aims to at least solve one of the technical problems in the background art. To this end, one object of the present application is to provide a battery device, a power utilization device and an energy storage device to improve the short circuit or overcurrent problem of the battery device.

[0005] Embodiments of the first aspect of the present application provide a battery device, comprising: a first battery pack, a second battery pack and a switch assembly, the switch assembly comprising a first single-pole double-throw switch and a second single-pole double-throw switch, the first single-pole double-throw switch being selectively switchable between a first state and a second state, the second single-pole double-throw switch being selectively switchable between a third state and a fourth state; the battery device having a first output terminal and a second output terminal, in the case that the first single-pole double-throw switch is in the first state and the second single-pole double-throw switch is in the third state, the first battery pack and the second battery pack are connected in parallel between the first output terminal and the second output terminal; in the case that the first single-pole double-throw switch is in the second state and the second single-pole double-throw switch is in the fourth state, the first battery pack and the second battery pack are connected in series between the first output terminal and the second output terminal.

[0006] The first single-pole double-throw switch and the second single-pole double-throw switch are configured to control the series-parallel connection of the battery pack, the first single-pole double-throw switch is selectively switchable between a first state and a second state, and the second single-pole double-throw switch is selectively switchable between a third state and a fourth state, that is, when the first single-pole double-throw switch is in the first state, the first single-pole double-throw switch cannot be in the second state at the same time, and when the second single-pole double-throw switch is in the third state, the second single-pole double-throw switch cannot be in the fourth state at the same time, so that the series connection and the parallel connection of the first battery pack and the second battery pack are mutually exclusive, so that the first battery pack and the second battery pack are not easy to be short-circuited or overcurrent, the safety of the battery device is improved, and compared with the solution in the prior art, the number and complexity of switches are reduced, the control logic design of the switch assembly is simplified, the complexity and failure rate of the control system are reduced, the possibility of switch misoperation is further reduced, the short-circuit or overcurrent problem is improved, and the safety of the battery device is further improved.

[0007] In some embodiments, the first battery pack and the first single-pole double-throw switch are sequentially connected between the first output terminal and the second output terminal; the second single-pole double-throw switch and the second battery pack are sequentially connected between the first output terminal and the second output terminal; and the first single-pole double-throw switch is further connected with the second single-pole double-throw switch.

[0008] In the embodiment, the first single-pole double-throw switch can switch the first battery pack to a series connection path in which the first battery pack and the second battery pack are connected in series, or to a parallel connection path in which the first battery pack and the second battery pack are connected in parallel, and the second single-pole double-throw switch can switch the second battery pack to the series connection path or to the parallel connection path, so as to realize the series connection and the parallel connection between the first battery pack and the second battery pack.

[0009] In some embodiments, the first single-pole double-throw switch includes a first electrical connection part, a first terminal, a second terminal, a third terminal, and a fourth terminal, the first terminal and the second terminal are respectively connected with the first battery pack, the third terminal is connected with the second output terminal, the fourth terminal is connected with the second single-pole double-throw switch, and the first electrical connection part is connected between the first terminal and the third terminal or between the second terminal and the fourth terminal; in the case that the first electrical connection part is connected between the first terminal and the third terminal, the first single-pole double-throw switch is in the first state, and in the case that the first electrical connection part is connected between the second terminal and the fourth terminal, the first single-pole double-throw switch is in the second state.

[0010] In the embodiment, by arranging the first electric connection part, the first terminal, the second terminal, the third terminal and the fourth terminal in the first single-pole double-throw switch, the first electric connection part is selectively connected between the first terminal and the third terminal or between the second terminal and the fourth terminal, so that the switching of the first single-pole double-throw switch between the first state and the second state can be realized, and the switching mode can integrate interlocking logic, that is, the interlocking between the two states of the first single-pole double-throw switch can be realized by mechanical and electrical methods, so that the interlocking switching of the first battery pack between the series connection path and the parallel connection path can be realized, and the structure is simple, easy to realize, and can improve the short circuit risk of the battery device.

[0011] In some embodiments, the second single-pole double-throw switch includes a second electric connection part, a fifth terminal, a sixth terminal, a seventh terminal and an eighth terminal, the fifth terminal and the sixth terminal are respectively connected with the second battery pack, the seventh terminal is connected with the first output terminal, the eighth terminal is connected with the fourth terminal, and the second electric connection part is connected between the fifth terminal and the seventh terminal or between the sixth terminal and the eighth terminal; in the case that the second electric connection part is connected between the fifth terminal and the seventh terminal, the second single-pole double-throw switch is in the third state, and in the case that the second electric connection part is connected between the sixth terminal and the eighth terminal, the second single-pole double-throw switch is in the fourth state.

[0012] In the embodiment, by arranging the second electric connection part, the fifth terminal, the sixth terminal, the seventh terminal and the eighth terminal in the second single-pole double-throw switch, the second electric connection part is selectively connected between the fifth terminal and the seventh terminal or between the sixth terminal and the eighth terminal, so that the switching of the second single-pole double-throw switch between the third state and the fourth state can be realized, and the switching mode can integrate interlocking logic, that is, the interlocking between the two states of the second single-pole double-throw switch can be realized by mechanical and electrical methods, so that the interlocking switching of the second battery pack between the series connection path and the parallel connection path can be realized, and the structure is simple, easy to realize, and can improve the short circuit risk of the battery device.

[0013] In some embodiments, the first single-pole double-throw switch has a first movable part, a first connection end and a second connection end, the first movable part is connected with the first battery pack, the first connection end is connected with the second output terminal, the second connection end is connected with the second single-pole double-throw switch, and the first movable part is connected with the first connection end or the second connection end; in the case that the first movable part is connected with the first connection end, the first single-pole double-throw switch is in the first state, and in the case that the first movable part is connected with the second connection end, the first single-pole double-throw switch is in the second state.

[0014] In the embodiment, the first movable part is selectively connected to the first connecting end or the second connecting end, so that the first single-pole double-throw switch can be switched between the first state and the second state, and the switching mode can integrate interlocking logic, that is, the interlocking between the two states of the first single-pole double-throw switch can be realized by mechanical and electrical methods, so that the first battery pack can be switched between the series path and the parallel path, and the structure is simple, easy to realize, and can improve the short circuit risk of the battery device.

[0015] In some embodiments, the second single-pole double-throw switch has a second movable part, a third connecting end and a fourth connecting end, the second movable part is connected to the second battery pack, the third connecting end is connected to the first output terminal, the fourth connecting end is connected to the second connecting end, and the second movable part is connected to the third connecting end or the fourth connecting end; in the case that the second movable part is connected to the third connecting end, the second single-pole double-throw switch is in a third state, and in the case that the second movable part is connected to the fourth connecting end, the second single-pole double-throw switch is in a fourth state.

[0016] In the embodiment, the second movable part is selectively connected to the third connecting end or the fourth connecting end, so that the second single-pole double-throw switch can be switched between the third state and the fourth state, and the switching mode can integrate interlocking logic, that is, the interlocking between the two states of the second single-pole double-throw switch can be realized by mechanical and electrical methods, so that the second battery pack can be switched between the series path and the parallel path, and the structure is simple, easy to realize, and can improve the short circuit risk of the battery device.

[0017] In some embodiments, a first fuse is further connected in series between the first battery pack and the first output terminal or the second output terminal; and a second fuse is further connected in series between the second battery pack and the first output terminal or the second output terminal.

[0018] The first fuse and the second fuse are provided in the embodiment, so that the safety of the circuit can be further improved, and the influence of short circuit and overcurrent on the battery device can be improved.

[0019] In some embodiments, the battery device further comprises a first main switch provided on an output line of the first output terminal, and the first main switch is provided in parallel with a pre-charge circuit, and the pre-charge circuit comprises a pre-charge resistor and a pre-charge switch connected in series.

[0020] In the embodiment, the pre-charge circuit can limit the current, reduce the risk of damage to components by instantaneous impact current, and improve the safety and reliability of the system.

[0021] In some embodiments, the battery apparatus further includes a second main switch disposed on an output line of the second output terminal.

[0022] In the embodiment, one set of pre-charging circuits can be provided to realize pre-charging of the battery apparatus in various working states, and further simplify circuit design, so that the pre-charging process of the battery apparatus can be safely performed in the switching process of the switching assembly, and the risk of damage of circuit components by instantaneous impact current is reduced.

[0023] In some embodiments, in a case where the first single-pole double-throw switch is in the first state and the second single-pole double-throw switch is in the fourth state, the first battery pack is connected between the first output terminal and the second output terminal; in a case where the first single-pole double-throw switch is in the second state and the second single-pole double-throw switch is in the third state, the second battery pack is connected between the first output terminal and the second output terminal.

[0024] In the embodiment, the battery apparatus can provide multiple working modes, can be used in different application scenarios, has high versatility, and when any one battery pack fails, other battery packs can continue to work, thereby improving the reliability of the battery apparatus.

[0025] Embodiments of the second aspect of the application provide a power consumption apparatus, which includes the battery apparatus in the above embodiments, and the battery apparatus is used to provide electric energy.

[0026] Embodiments of the third aspect of the application provide an energy storage apparatus, which includes the battery apparatus in the above embodiments, and the energy storage apparatus is used to store electric energy.

[0027] The above description is only a summary of the technical solutions of the application, in order to enable the technical means of the application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, characteristics and advantages of the application to be more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0028] In the drawings, like reference numerals refer to same or similar elements throughout the several views. The drawings are not necessarily to scale. It should be understood that these drawings are only schematic and that the shapes of the various elements in the figures are intended to show only the general features of the application. They are not a definitive representation of the application.

[0029] Figure 1 Structure schematic diagram of a vehicle of some embodiments of the application;

[0030] Figure 2 Circuit schematic diagram of a battery apparatus of some embodiments of the application;

[0031] Figure 3A circuit schematic of a battery device according to another embodiment of the application.

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] Vehicle 1000

[0034] Battery device 100, first output terminal 110, second output terminal 120, controller 200, motor 300, first battery pack 400, second battery pack 500,

[0035] Switch assembly 600, first single-pole double-throw switch 610, first terminal 611, second terminal 612, third terminal 613, fourth terminal 614, first electrical connection 615, second single-pole double-throw switch 620, fifth terminal 621, sixth terminal 622, seventh terminal 623, eighth terminal 624, second electrical connection 625

[0036] First connection 631, second connection 632, first movable part 633, third connection 641, fourth connection 642, second movable part 643, first fuse 650, second fuse 660

[0037] First main switch 710, second main switch 720, pre-charge circuit 730, pre-charge resistor 731, pre-charge switch 732 DETAILED DESCRIPTION

[0038] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0041] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments in accordance with the application.

[0042] In the description of the embodiments of the application, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, a and / or b, which can represent the three cases of a alone, a and b together, and b alone. In addition, the character“ / ” herein generally represents an“or” relationship between the front and rear associated objects.

[0043] In the description of the embodiments of the application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0044] In the description of the embodiments of the application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the application.

[0045] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0046] At present, from the development of market situation, the application of rechargeable battery is more and more widely. Rechargeable battery is not only applied to energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in various electronic equipment, such as electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of rechargeable battery, the market demand is also increasing.

[0047] In the related art, there is a scheme that two battery packs are connected in series and parallel through control switches. For example, the first battery pack and the first control switch are connected in series between the positive and negative terminals of the battery, the second control switch and the second battery pack are connected in series between the positive and negative terminals, and one end of the third control switch is connected between the first battery pack and the first control switch, and the other end is connected between the second battery pack and the second control switch. By controlling the first control switch and the second control switch to be closed and the third control switch to be opened, the parallel connection of the first battery pack and the second battery pack can be realized. By controlling the first control switch and the second control switch to be opened and the third control switch to be closed, the series connection of the first battery pack and the second battery pack can be realized.

[0048] However, during the switching process of the series and parallel connection of the battery packs, the above three control switches need to be controlled at the same time, which is complex and prone to misoperation, causing the first control switch and the third control switch to be closed at the same time, or the second control switch and the third control switch to be closed at the same time, which will cause the phenomenon of short circuit or overcurrent of the battery pack.

[0049] In order to improve at least one of the above problems, the embodiments of the present application provide a battery device, a power utilization device and an energy storage device. The battery device comprises a first battery pack, a second battery pack and a switch assembly. The switch assembly comprises a first single-pole double-throw switch and a second single-pole double-throw switch. The first single-pole double-throw switch can be selectively switched between a first state and a second state. The second single-pole double-throw switch can be selectively switched between a third state and a fourth state. The battery device has a first output terminal and a second output terminal. When the first single-pole double-throw switch is in the first state and the second single-pole double-throw switch is in the third state, the first battery pack and the second battery pack are connected in parallel between the first output terminal and the second output terminal. When the first single-pole double-throw switch is in the second state and the second single-pole double-throw switch is in the fourth state, the first battery pack and the second battery pack are connected in series between the first output terminal and the second output terminal.

[0050] The first single-pole double-throw switch and the second single-pole double-throw switch are provided to control the series-parallel connection of the battery pack. The first single-pole double-throw switch can be selectively switched between a first state and a second state, and the second single-pole double-throw switch can be selectively switched between a third state and a fourth state. That is, when the first single-pole double-throw switch is in the first state, the first single-pole double-throw switch cannot be in the second state at the same time, and when the second single-pole double-throw switch is in the third state, the second single-pole double-throw switch cannot be in the fourth state at the same time. Therefore, the series connection and the parallel connection of the first battery pack and the second battery pack have exclusivity, so that the first battery pack and the second battery pack are not easy to be short-circuited or overcurrent, and the safety of the battery device is improved. Compared with the scheme in the related art, the switch assembly reduces the number and complexity of switches, simplifies the control logic design of the switch assembly, reduces the complexity and failure rate of the control system, further reduces the possibility of switch misoperation, thereby improving the short-circuit or overcurrent problem and further improving the safety of the battery device.

[0051] The technical solutions described in the embodiments of the present application are suitable for a battery device, a power consumption device using the battery device, and an energy storage device.

[0052] The energy storage device using the battery device as a power source in the embodiments of the present application includes one or more battery clusters to improve the voltage and capacity of the energy storage device. The battery cluster can include a plurality of battery devices, and the plurality of battery devices are connected in series through a busbar component to improve the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the energy storage device.

[0053] The energy storage device can be used in an energy storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during the off-peak period of electricity consumption, and provide electrical energy for related users or power consumption devices during the peak period of electricity consumption. The energy storage system provided in the embodiments of the present application can be any power system that needs to use an energy storage device. As an example, the energy storage device is an energy storage container or an energy storage cabinet.

[0054] The power consumption device using the battery device as a power source in the embodiments of the present application can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0055] It should be understood that the technical solutions described in the embodiments of the present application are not only applicable to the above-described energy storage device and power consumption device, but also applicable to all battery devices including a box body and power consumption devices using the battery device. For the sake of brevity of description, the following embodiments are described by taking the power consumption device as a vehicle as an example.

[0056] Please refer to Figure 1 , Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for low-voltage power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the working power demand of the vehicle 1000 during starting, navigation and driving.

[0057] In some embodiments of the present application, the battery device 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0058] The battery device 100 (Battery Apparatus) mentioned in the embodiments of the present application can include a plurality of battery packs, each of which can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0059] In some embodiments, the battery cell assembly (Battery Cell Assembly) is usually formed by arranging a plurality of battery cells.

[0060] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0061] In some embodiments, the battery pack can also be a battery package including a case and one or more battery cell assemblies housed in the case. As an example, the battery cell assembly can be a battery module, which can be housed in the case by securing the battery module in the case.

[0062] As an example, the battery cell assembly can also be housed in the case by securing a plurality of battery cells directly in the case.

[0063] Embodiments of the present application provide a battery cell, which can be a secondary battery, i.e., a battery cell that can be activated by charging after discharging.

[0064] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., which are not limited by embodiments of the present application.

[0065] Figure 2 A circuit schematic diagram of a battery device according to some embodiments of the present application; please refer to Figure 2 Embodiments of the present application provide a battery device 100, which includes a first battery pack 400, a second battery pack 500, and a switch assembly 600, the switch assembly 600 including a first single-pole double-throw switch 610 and a second single-pole double-throw switch 620, the first single-pole double-throw switch 610 being capable of being selectively switched between a first state and a second state, and the second single-pole double-throw switch 620 being capable of being selectively switched between a third state and a fourth state; the battery device 100 having a first output terminal 110 and a second output terminal 120, in a case where the first single-pole double-throw switch 610 is in the first state and the second single-pole double-throw switch 620 is in the third state, the first battery pack 400 and the second battery pack 500 being connected in parallel between the first output terminal 110 and the second output terminal 120; in a case where the first single-pole double-throw switch 610 is in the second state and the second single-pole double-throw switch 620 is in the fourth state, the first battery pack 400 and the second battery pack 500 being connected in series between the first output terminal 110 and the second output terminal 120.

[0066] As shown in Figure 2 The battery device can include a plurality of battery packs, for example, two battery packs, which can be a first battery pack 400 and a second battery pack 500, respectively, and the first battery pack 400 or the second battery pack 500 can be a battery package or a battery module, etc.

[0067] In some embodiments, the first battery pack and the second battery pack can be physically isolated. It can be understood that the physical isolation can mean that the first battery pack 400 and the second battery pack 500 are respectively installed in different housings or are installed in different cavities of the same housing. It can be understood that the battery device can also include other battery packs, which can be selected according to actual conditions.

[0068] The switch assembly 600 can be used to connect the first battery pack 400 and the second battery pack 500, so as to change the connection state of the two, and in turn change the power supply state of the battery device 100. For example, one or more of the first battery pack and the second battery pack can be connected to the load for power supply by the switch assembly. When multiple battery packs are used for power supply, the first battery pack and the second battery pack can also be connected in series or in parallel.

[0069] It can be understood that the battery device can have two output terminals, namely the first output terminal 110 and the second output terminal 120. One of the two can be a positive electrode, and the other can be a negative electrode. When power supply is performed, the load can be connected to the first output terminal 110 and the second output terminal 120 respectively, so as to obtain power from the battery device. The switch assembly can be arranged in the internal circuit of the battery. Different battery packs can be connected between the first output terminal and the second output terminal by the switch assembly. It can be understood that only the battery pack connected between the first output terminal and the second output terminal can supply power to the load, and the battery pack not connected between the first output terminal and the second output terminal will be in an open circuit state and will not supply power to the load.

[0070] The switch assembly 600 can include a first single-pole double-throw switch 610 and a second single-pole double-throw switch 620. The first single-pole double-throw switch and the second single-pole double-throw switch can be selectively switched between two states. The first single-pole double-throw switch and the second single-pole double-throw switch can be of the same model or of different models. It can be understood that the single-pole double-throw switch can be a component that can realize switching of the switch state. It can have a mutual exclusion function between the two states, that is, mutual exclusion between the two states.

[0071] The first single-pole double-throw switch 610 can have a first state and a second state, and it can be understood that the first single-pole double-throw switch 610 can be selectively switched between the first state and the second state. For example, the first single-pole double-throw switch 610 can be in the first state when it is not enabled, i.e., not driven, and can be in the second state when it is enabled, i.e., driven. For another example, the first single-pole double-throw switch 610 can be in the first state when it is enabled, and can be in the second state when it is not enabled. It can be understood that the first state and the second state of the first single-pole double-throw switch 610 are mutually exclusive, and the first single-pole double-throw switch 610 cannot be in the second state or other state when it is in the first state, and cannot be in the first state or other state when it is in the second state.

[0072] Similarly, the second single-pole double-throw switch can be selectively switched between a third state and a fourth state. For example, the second single-pole double-throw switch 620 can be in the third state when it is not enabled, and can be in the fourth state when it is enabled. For another example, the second single-pole double-throw switch 620 can be in the third state when it is enabled, and can be in the fourth state when it is not enabled. It can be understood that the third state and the fourth state of the second single-pole double-throw switch 620 are mutually exclusive, and the second single-pole double-throw switch 620 cannot be in the fourth state or other state when it is in the third state, and cannot be in the third state or other state when it is in the fourth state.

[0073] When the first single-pole double-throw switch 610 is in the first state and the second single-pole double-throw switch 620 is in the third state, the first battery pack 400 and the second battery pack 500 are connected in parallel between the first output terminal 110 and the second output terminal 120. When the first single-pole double-throw switch 610 is in the second state, the first battery pack 400 and the second battery pack 500 are connected in series between the first output terminal 110 and the second output terminal 120.

[0074] In the parallel state, the connection circuit of the first battery pack 400 and the second battery pack 500 is a parallel path, and in the series state, the connection circuit of the first battery pack 400 and the second battery pack 500 is a series path. It can be understood that when the first single-pole double-throw switch is in the first state, the first battery pack 400 is in the parallel path, and when the first single-pole double-throw switch is in the second state, the first battery pack is in the series path, so that the state change of the first single-pole double-throw switch can make the first battery pack be in the series path or the parallel path. Similarly, when the second single-pole double-throw switch is in the third state, the second battery pack 500 is in the parallel path, and when the second single-pole double-throw switch is in the fourth state, the second battery pack is in the series path, so that the state change of the second single-pole double-throw switch can make the second battery pack be in the series path or the parallel path.

[0075] In this embodiment, the first battery pack and the second battery pack can be connected in series or parallel through the first single-pole double-throw switch and the second single-pole double-throw switch. Compared with the scheme of connecting in series or parallel through three control switches in the related art, the circuit structure can be simplified, the number and complexity of switches and other components can be reduced, the control logic design of the switch assembly can be simplified, the complexity and failure rate of the control system can be reduced, the possibility of switch misoperation can be reduced, the short circuit or overcurrent problem can be improved, and the safety of the battery device can be improved.

[0076] Meanwhile, by reducing the number of components, the circuit structure can be simplified, the maintenance and troubleshooting of the circuit can be more efficient, and once a failure occurs, the problem can be located and repaired faster, and the maintenance efficiency is improved. Moreover, by reducing the number of components, the failure nodes and connection nodes of the switch assembly can be reduced, the risk of circuit failure caused by failure or wiring problem of the first single-pole double-throw switch (or the second single-pole double-throw switch) can be reduced, and the reliability and safety of the system can be improved. In addition, the procurement cost and assembly cost of components can be reduced, and the production process and circuit design of the battery device can be simplified, and the cost can be reduced.

[0077] In this embodiment, the first single-pole double-throw switch or the second single-pole double-throw switch has two mutually exclusive states, that is, one switch can switch two circuit paths of one battery pack. For example, the first single-pole double-throw switch can switch the series or parallel path of the first battery pack, without simultaneously controlling multiple switches to switch the relevant circuit path of each battery pack, so that only one circuit path in the relevant circuit path of each battery pack can be turned on at any time, and the risk of short circuit caused by switch control failure or failure is reduced, and the safety of the battery device and the reliability of the system control are improved.

[0078] According to some embodiments of the present application, the first battery pack 400 and the first single-pole double-throw switch 610 are connected in sequence between the first output terminal 110 and the second output terminal 120; the second single-pole double-throw switch 620 and the second battery pack 500 are connected in sequence between the first output terminal 110 and the second output terminal 120; and the first single-pole double-throw switch 610 is also connected with the second single-pole double-throw switch 620.

[0079] As Figure 2 The positive electrode of the first battery pack 400 is the first end of the first battery pack 400, the negative electrode of the first battery pack 400 is the second end of the first battery pack 400, the positive electrode of the second battery pack 500 is the first end of the second battery pack 500, and the negative electrode of the second battery pack is the second end of the second battery pack 500. The first output terminal 110 can be the positive output terminal of the battery device, and the second output terminal 120 can be the negative output terminal of the battery device.

[0080] It can be understood that the first single-pole double-throw switch 610 and the second single-pole double-throw switch 620 can have multiple connection terminals, so as to realize connection with multiple components.

[0081] In the embodiment, the first end of the first battery pack 400 can be electrically connected with the first output terminal 110, the second end of the first battery pack 400 is electrically connected with the first single-pole double-throw switch 610, and in addition, the first single-pole double-throw switch 610 can also be electrically connected with the second output terminal 120, so as to sequentially connect the first battery pack 400 and the first single-pole double-throw switch 610 between the first output terminal 110 and the second output terminal 120.

[0082] The first end of the second battery pack 500 can be electrically connected with the second single-pole double-throw switch 620, the second end of the second battery pack 500 can be electrically connected with the second output terminal 120, and the second single-pole double-throw switch 620 can also be electrically connected with the first output terminal 110, so as to sequentially connect the second single-pole double-throw switch 620 and the second battery pack 500 between the first output terminal 110 and the second output terminal 120. In addition, the first single-pole double-throw switch 610 can also be electrically connected with the second single-pole double-throw switch 620.

[0083] In other embodiments, the first end of the first battery pack 400 and the first end of the second battery pack 500 can be the negative poles thereof, the second end of the first battery pack 400 and the second end of the second battery pack 500 can be the positive poles thereof, the first output terminal can be a negative output terminal of the battery device, and the second output terminal can be a positive output terminal of the battery device.

[0084] It can be understood that the above connections can be direct electrical connections or indirect electrical connections through other electrical components, unless otherwise specified.

[0085] In the embodiment, the first single-pole double-throw switch 610 can switch the first battery pack to a series connection path in which the first battery pack and the second battery pack are connected in series, or to a parallel connection path in which the first battery pack and the second battery pack are connected in parallel, and the second single-pole double-throw switch 620 can switch the second battery pack to the series connection path or to the parallel connection path, so as to realize series connection and parallel connection between the first battery pack and the second battery pack.

[0086] It can be understood that the structure of the first single-pole double-throw switch and the second single-pole double-throw switch can be various, which will be described in the following embodiments.

[0087] Continuing to refer to Figure 2According to some embodiments of this application, a first single-pole double-throw switch 610 includes a first electrical connection portion 615, a first terminal 611, a second terminal 612, a third terminal 613, and a fourth terminal 614. The first terminal 611 and the second terminal 612 are respectively connected to the first battery pack 400, the third terminal 613 is connected to the second output terminal 120, and the fourth terminal 614 is connected to the second single-pole double-throw switch 620. The first electrical connection portion 615 is connected between the first terminal 611 and the third terminal 613 or between the second terminal 612 and the fourth terminal 614. When the first electrical connection portion 615 is connected between the first terminal 611 and the third terminal 613, the first single-pole double-throw switch 610 is in a first state. When the first electrical connection portion 615 is connected between the second terminal 612 and the fourth terminal 614, the first single-pole double-throw switch 610 is in a second state.

[0088] In this embodiment, the first single-pole double-throw switch 610 may include four terminals, namely the first terminal 611, the second terminal 612, the third terminal 613 and the fourth terminal 614.

[0089] like Figure 2 In this configuration, the first terminal 611 can be connected to the first battery pack 400 (e.g., the second terminal of the first battery pack), and the second terminal 612 can also be connected to the first battery pack 400 (e.g., the second terminal of the first battery pack). It can be understood that the second terminal 612 can be directly connected to the first battery pack, or the second terminal 612 can be connected to the first terminal 611, thereby indirectly connecting to the first battery pack. Of course, the first terminal 611 can be directly connected to the first battery pack, or the first terminal can be connected to the second terminal 612, thereby indirectly connecting to the first battery pack.

[0090] The third terminal 613 can be connected to the second output terminal, and the fourth terminal 614 can be connected to the second single-pole double-throw switch 620.

[0091] The first single-pole double-throw switch 610 may further include a first electrical connection portion 615. The first electrical connection portion 615 may be a conductive sheet or a conductive block, etc., and can move under the drive of a drive signal, thereby changing the terminal it connects. In this embodiment, the first electrical connection portion 615 can connect the first terminal 611 and the third terminal 613, or connect the second terminal 612 and the fourth terminal 614, under the drive of a drive signal. It can be understood that when the first electrical connection portion 615 is connected to the first terminal 611 and the third terminal 613, the second terminal 612 and the fourth terminal 614 are disconnected; when the first electrical connection portion 615 is connected to the second terminal 612 and the fourth terminal 614, the first terminal 611 and the third terminal 613 are disconnected.

[0092] For example, when the first single-pole double-throw switch 610 is not enabled, the first electrical connection part 615 is connected between the first terminal 611 and the third terminal 613, at this time, the first terminal 611 and the third terminal 613 are in conduction, the first single-pole double-throw switch 610 is in the first state. When the first single-pole double-throw switch 610 receives a driving signal and is enabled, the first electrical connection part 615 can be driven to be connected between the second terminal 612 and the fourth terminal 614, at this time, the second terminal 612 and the fourth terminal 614 are in conduction, the first terminal 611 and the third terminal 613 are disconnected, and the first single-pole double-throw switch 610 is in the second state.

[0093] In the embodiment, by arranging the first electrical connection part, the first terminal, the second terminal, the third terminal and the fourth terminal in the first single-pole double-throw switch, the first electrical connection part is selectively connected between the first terminal and the third terminal or between the second terminal and the fourth terminal, so that the switching of the first single-pole double-throw switch between the first state and the second state can be realized, and the switching mode can integrate interlocking logic, that is, the interlocking between the two states of the first single-pole double-throw switch can be realized by mechanical and electrical methods, so that the interlocking switching of the first battery pack between the series path and the parallel path can be realized, and the structure is simple, easy to realize, and can improve the short circuit risk of the battery device.

[0094] According to some embodiments of the present application, the second single-pole double-throw switch 620 includes a second electrical connection part 625, a fifth terminal 621, a sixth terminal 622, a seventh terminal 623 and an eighth terminal 624, the fifth terminal 621 and the sixth terminal 622 are respectively connected with the second battery pack 500, the seventh terminal 623 is connected with the first output terminal 110, the eighth terminal 624 is connected with the fourth terminal 614, and the second electrical connection part 625 is connected between the fifth terminal 621 and the seventh terminal 623 or between the sixth terminal 622 and the eighth terminal 624; in the case that the second electrical connection part 625 is connected between the fifth terminal 621 and the seventh terminal 623, the second single-pole double-throw switch 620 is in the third state, and in the case that the second electrical connection part 625 is connected between the sixth terminal 622 and the eighth terminal 624, the second single-pole double-throw switch 620 is in the fourth state.

[0095] In the embodiment, the second single-pole double-throw switch 620 can include four terminals, which are the fifth terminal 621, the sixth terminal 622, the seventh terminal 623 and the eighth terminal 624.

[0096] As Figure 2In this embodiment, the fifth terminal 621 can be connected with the second battery pack 500 (e.g. the first terminal of the second battery pack), and the sixth terminal 622 can also be connected with the second battery pack 500 (e.g. the first terminal of the second battery pack). It can be understood that the sixth terminal 622 can be directly connected with the second battery pack, or the sixth terminal 622 can be connected with the fifth terminal 621, thereby indirectly connected with the second battery pack. Of course, the fifth terminal 621 can be directly connected with the second battery pack, or the fifth terminal can be connected with the sixth terminal 622, thereby indirectly connected with the second battery pack.

[0097] The seventh terminal 623 can be connected with the first output terminal, and the eighth terminal 624 can be connected with the first single-pole double-throw switch, for example, the fourth terminal 614 thereof.

[0098] The second single-pole double-throw switch 620 can further include a second electrical connection part 625, which can be a conductive sheet or a conductive block, etc., which can move under the driving of the driving signal, thereby changing the terminals it conducts. In this embodiment, the second electrical connection part 625 can be connected with the fifth terminal 621 and the seventh terminal 623, or connected with the sixth terminal 622 and the eighth terminal 624 under the driving of the driving signal. It can be understood that when the second electrical connection part 625 is connected with the fifth terminal 621 and the seventh terminal 623, the sixth terminal 622 and the eighth terminal 624 are disconnected, and when the first electrical connection part 615 is connected with the sixth terminal 622 and the eighth terminal 624, the fifth terminal 621 and the seventh terminal 623 are disconnected.

[0099] For example, when the second single-pole double-throw switch 620 is not enabled, the second electrical connection part 625 is connected between the fifth terminal 621 and the seventh terminal 623, at this time the fifth terminal 621 and the seventh terminal 623 are conductive, and the second single-pole double-throw switch 620 is in the third state. When the second single-pole double-throw switch 620 receives the driving signal and is enabled, the second electrical connection part 625 can be driven to be connected between the sixth terminal 622 and the eighth terminal 624, at this time the sixth terminal 622 and the eighth terminal 624 are conductive, and the fifth terminal and the seventh terminal are disconnected, and the second single-pole double-throw switch 620 is in the fourth state.

[0100] In this embodiment, when the first electrical connection part 615 is connected between the first terminal 611 and the third terminal 613, and the second electrical connection part 625 is connected between the fifth terminal 621 and the seventh terminal 623, the first battery pack 400 and the second battery pack 500 are connected in parallel. When the first electrical connection part 615 is connected between the second terminal 612 and the fourth terminal 614, and the second electrical connection part 625 is connected between the sixth terminal 622 and the eighth terminal 624, the first battery pack 400 and the second battery pack 500 are connected in series.

[0101] When the first electric connection part 615 is connected between the first terminal 611 and the third terminal 613, and the second electric connection part 625 is connected between the sixth terminal 622 and the eighth terminal 624, the first battery pack 400 is connected between the first output terminal 110 and the second output terminal 120. When the first electric connection part 615 is connected between the second terminal 612 and the fourth terminal 614, and the second electric connection part 625 is connected between the fifth terminal 621 and the seventh terminal 623, the second battery pack 500 is connected between the first output terminal 110 and the second output terminal 120.

[0102] Therefore, in each state combination of the first single-pole double-throw switch and the second single-pole double-throw switch, the phenomenon of short circuit of the battery pack does not occur, thereby improving the safety of the battery device.

[0103] In the embodiment, by arranging the second electric connection part, the fifth terminal, the sixth terminal, the seventh terminal and the eighth terminal in the second single-pole double-throw switch, the second electric connection part is selectively connected between the fifth terminal and the seventh terminal or between the sixth terminal and the eighth terminal, thereby realizing the switching of the second single-pole double-throw switch between the third state and the fourth state, and the switching mode can integrate the interlocking logic, that is, the interlocking between the two states of the second single-pole double-throw switch can be realized by mechanical and electrical methods, thereby realizing the interlocking switching of the second battery pack between the series connection path or the parallel connection path, and the structure is simple, easy to realize, and can improve the short circuit risk of the battery device.

[0104] Figure 3 The circuit principle diagram of the battery device of another embodiment of the application; please refer to Figure 3 According to another embodiment of the application, the first single-pole double-throw switch 610 has a first movable part 633, a first connection end 631 and a second connection end 632, the first movable part 633 is connected with the first battery pack 400, the first connection end 631 is connected with the second output terminal 120, the second connection end 632 is connected with the second single-pole double-throw switch 620, and the first movable part 633 is connected with the first connection end 631 or the second connection end 632; in the case that the first movable part 633 is connected with the first connection end 631, the first single-pole double-throw switch 610 is in the first state, and in the case that the first movable part 633 is connected with the second connection end 632, the first single-pole double-throw switch 610 is in the second state.

[0105] In the embodiment, the first single-pole double-throw switch 610 can include the first connection end 631 and the second connection end 632, the first connection end 631 can be connected with the second output terminal 120, and the second connection end 632 can be connected with the second single-pole double-throw switch 620.

[0106] The first single-pole double-throw switch 610 can further include a first movable part 633. It can be understood that a first end of the first movable part 633 can be kept in electrical connection with the first battery pack 400 (e.g., the second end of the first battery pack) at all times, and a second end of the first movable part 633 can move relative to the first end, so that the first movable part 633 connects the first connecting end 631 or the second connecting end 632. When the first movable part 633 connects the first connecting end 631, it can conduct the first battery pack to the first connecting end, and the first single-pole double-throw switch is in the first state. When the first movable part 633 connects the second connecting end 632, it can conduct the first battery pack to the second connecting end, and the first single-pole double-throw switch is in the second state. Figure 3

[0107] It can be understood that when the first movable part 633 moves to contact the first connecting end 631, it cannot contact the second connecting end 632, thereby breaking the series connection path between the first battery pack and the second battery pack, and the first single-pole double-throw switch is in the first state. When the first movable part 633 moves to contact the second connecting end 632, it cannot contact the first connecting end 631, thereby breaking the parallel connection path between the first battery pack and the second battery pack, and the first single-pole double-throw switch is in the second state. Therefore, the first single-pole double-throw switch cannot be in a state of simultaneously conducting the series connection path and the parallel connection path, thereby improving the short circuit risk of the second battery pack.

[0108] In some embodiments, when the first single-pole double-throw switch is not enabled, the first movable part 633 can contact the first connecting end, and when it is enabled, it can move to contact the second connecting end. Alternatively, when the first single-pole double-throw switch is not enabled, the first movable part 633 can contact the second connecting end, and when it is enabled, it can move to contact the first connecting end. Alternatively, the first single-pole double-throw switch can have two enabled states. When it is not enabled, the first movable part 633 can be located between the first connecting end and the second connecting end and not contact both. When it receives a first enable signal, it can contact the first connecting end. When it receives a second enable signal, it can contact the second connecting end.

[0109] In this embodiment, by providing the first movable part, the first connecting end, and the second connecting end in the first single-pole double-throw switch, the first movable part can selectively connect to the first connecting end or the second connecting end, thereby achieving switching of the first single-pole double-throw switch between the first state and the second state, and the switching mode can integrate interlocking logic, i.e., the two states of the first single-pole double-throw switch can be interlocked by mechanical and electrical methods, thereby achieving interlocking switching of the first battery pack between the series connection path and the parallel connection path, and the structure is simple and easy to implement, thereby improving the short circuit risk of the battery device.

[0110] Continuing to refer to​Figure 3 According to some embodiments of the present application, the second single-pole double-throw switch 620 has a second movable part 643 connected with the second battery pack 500, a third connection end 641 connected with the first output terminal 110, and a fourth connection end 642 connected with the second connection end 632, the second movable part 643 is connected with the third connection end 641 or the fourth connection end 642; in the case that the second movable part 643 is connected with the third connection end 641, the second single-pole double-throw switch 620 is in the third state, and in the case that the second movable part 643 is connected with the fourth connection end 642, the second single-pole double-throw switch 620 is in the fourth state.

[0111] In the embodiment, the second single-pole double-throw switch 620 can include the third connection end 641 and the fourth connection end 642, the third connection end 641 can be connected with the first output terminal 110, and the fourth connection end 642 can be connected with the first single-pole double-throw switch, for example, the second connection end 632.

[0112] The second single-pole double-throw switch 620 can further include the second movable part 643, it can be understood that, as Figure 3 The first end of the second movable part 643 can always keep electrical connection with the second battery pack 500 (for example, the first end of the second battery pack), and the second end of the second movable part 643 can move relative to the first end, so that the second movable part 643 is connected with the third connection end 641 or the fourth connection end 642, when the second movable part 643 is connected with the third connection end 641, it can conduct the second battery pack with the third connection end, and the second single-pole double-throw switch is in the third state. When the second movable part 643 is connected with the fourth connection end 642, it can conduct the second battery pack with the fourth connection end, and the second single-pole double-throw switch is in the fourth state.

[0113] It can be understood that when the second movable part 643 moves to contact the third connection end 641, it cannot contact the fourth connection end 642, so as to break the series connection path between the first battery pack and the second battery pack, and the second single-pole double-throw switch is in the third state. When the second movable part 643 moves to contact the fourth connection end 642, it cannot contact the third connection end 641, so as to break the parallel connection path between the first battery pack and the second battery pack, and the second single-pole double-throw switch is in the fourth state. Therefore, the situation that the second single-pole double-throw switch simultaneously conducts the series connection path and the parallel connection path does not occur, and thus the short circuit of the first battery pack can be improved.

[0114] In the embodiment, when the first movable part 633 moves to contact the first connecting end 631 and the second movable part 643 moves to contact the third connecting end 641, the first battery pack 400 and the second battery pack 500 are connected in parallel. When the first movable part 633 moves to contact the second connecting end 632 and the second movable part 643 moves to contact the fourth connecting end 642, the first battery pack 400 and the second battery pack 500 are connected in series.

[0115] When the first movable part 633 moves to contact the first connecting end 631 and the second movable part 643 moves to contact the fourth connecting end 642, the first battery pack 400 is connected alone between the first output terminal 110 and the second output terminal 120. When the first movable part 633 moves to contact the second connecting end 632 and the second movable part 643 moves to contact the third connecting end 641, the second battery pack 500 is connected alone between the first output terminal 110 and the second output terminal 120.

[0116] Therefore, in each state combination of the first single-pole double-throw switch and the second single-pole double-throw switch, the phenomenon of short circuit of the battery pack does not occur, thereby improving the safety of the battery device.

[0117] In the embodiment, by arranging the first movable part, the third connecting end and the fourth connecting end in the second single-pole double-throw switch, the second movable part is selectively connected to the third connecting end or the fourth connecting end, thereby realizing the switching of the second single-pole double-throw switch between the third state and the fourth state, and the switching mode can integrate the interlocking logic, that is, the interlocking between the two states of the second single-pole double-throw switch can be realized by mechanical and electrical methods, thereby realizing the interlocking switching of the second battery pack between the series connection path or the parallel connection path, and the structure is simple, easy to realize, and can improve the short circuit risk of the battery device.

[0118] It can be understood that, in some embodiments, the first single-pole double-throw switch 610 can adopt the structure shown in Figure 2 , the second single-pole double-throw switch 620 can adopt the structure shown in Figure 3 , or the first single-pole double-throw switch 610 can adopt the structure shown in Figure 3 , and the second single-pole double-throw switch 620 can adopt the structure shown in Figure 2 .

[0119] Continuing to refer to Figure 2 , according to some embodiments of the present application, a first fuse 650 is further connected in series between the first battery pack 400 and the first output terminal 110 or the second output terminal 120; and a second fuse 660 is further connected in series between the second battery pack 500 and the first output terminal 110 or the second output terminal 120.

[0120] The first fuse 650 and the second fuse 660 can be safety devices for protecting the circuit, and when the current is too high, the fuses can be triggered to disconnect the circuit and reduce the damage caused by overcurrent.

[0121] In this embodiment, when the load fluctuates and causes the current in the battery device to be too large, the first fuse 650 and the second fuse 660 can work to disconnect the loop between the battery pack and the load, thereby protecting the battery pack.

[0122] It can be understood that the first fuse 650 and the second fuse 660 can be arranged in various positions, for example, Figure 2 In this embodiment, the first fuse 650 is arranged between the third terminal 613 of the first single-pole double-throw switch and the second output terminal 120, or the first fuse 650 can be arranged between the first output terminal 110 and the first end of the first battery pack.

[0123] Similarly, the second fuse 660 can be arranged between the seventh terminal 623 of the second single-pole double-throw switch and the first output terminal 110, or the first fuse 650 can be arranged between the second output terminal 120 and the second end of the second battery pack.

[0124] In addition, in the embodiment shown in Figure 3 In this embodiment, the first fuse 650 is arranged between the first connection terminal 631 of the first single-pole double-throw switch and the second output terminal 120, or the first fuse 650 can be arranged between the first output terminal 110 and the first end of the first battery pack.

[0125] Similarly, the second fuse 660 can be arranged between the third connection terminal 641 of the second single-pole double-throw switch and the first output terminal 110, or the first fuse 650 can be arranged between the second output terminal 120 and the second end of the second battery pack.

[0126] The first fuse and the second fuse arranged in this embodiment can further improve the safety of the circuit and improve the impact of short circuit and overcurrent on the battery device.

[0127] Continuing to refer to Figure 2 According to some embodiments of the present application, the battery device 100 further includes a first main switch 710 arranged on the output line of the first output terminal 110, and the first main switch 710 is arranged in parallel with a pre-charge circuit 730, and the pre-charge circuit 730 includes a pre-charge resistor 731 and a pre-charge switch 732 arranged in series.

[0128] It can be understood that the first output terminal 110 can be connected to the load through an output line, and the first main switch 710 can be arranged on the output line to control the on-off of the line.

[0129] The first main switch 710 can be connected in parallel with a pre-charge circuit 730, which can include a pre-charge resistor 731 and a pre-charge switch 732, as shown in Figure 2 In some embodiments, one end of the pre-charge resistor 731 can be connected to one end of the first main switch 710, and the other end of the pre-charge resistor 731 can be connected to one end of the pre-charge switch 732, and the other end of the pre-charge switch 732 can be connected to the other end of the first main switch 710. Of course, the positions of the pre-charge resistor 731 and the pre-charge switch 732 can be interchanged.

[0130] It can be understood that when the system receives a high-voltage power-on instruction, the pre-charge switch 732 can be closed first, and the first main switch 710 is opened, at this time, due to the action of the pre-charge resistor 731, the current in the loop can be controlled in a relatively safe range, then the first main switch 710 can be closed, and then the pre-charge switch 732 is opened, thereby gradually increasing the load voltage to the normal power supply state, which can improve the problem of excessive instantaneous voltage and current caused by directly closing the first main switch 710 when power-on, causing load failure and other problems, and improve the system safety and the reliability of the start.

[0131] In addition, the first main switch 710 and the pre-charge switch 732 can be switches that can realize the on-off of the line in the related art, and the pre-charge resistor 731 can be a fixed resistor or an adjustable resistor, and the resistance value thereof can be set according to the situation.

[0132] In the embodiment, the pre-charge circuit can limit the current, reduce the risk of damage to components caused by instantaneous impact current, and improve the system safety and the reliability of the start.

[0133] According to some embodiments of the present application, the battery device 100 further includes a second main switch 720 arranged on an output line of the second output terminal 120.

[0134] It can be understood that the second output terminal 120 can be connected with the load through an output line, and the second main switch 720 can be arranged on the output line to control the on-off of the line. It can be understood that the first main switch 710 can be connected between the first output terminal 110 and the load, and the second main switch 720 can be connected between the load and the second output terminal. In addition, the second main switch 720 can also be a switch that can realize the on-off of the line in the related art.

[0135] In some embodiments, the first output terminal can be a positive terminal of the battery device. The pre-charge circuit 730 can be arranged between the positive terminal of the battery device and the load, and no pre-charge circuit is arranged between the load and the negative terminal of the battery device.

[0136] It can be understood that in the embodiment, one set of pre-charging circuit can be provided to realize the pre-charging of the battery device in each working state, and the circuit design is further simplified, so that the pre-charging process of the battery device can be safely carried out during the switching process of the switch assembly, and the risk of damage of the circuit components by instantaneous large current is reduced.

[0137] In addition, the number of pre-charging circuits (pre-charging switches and pre-charging resistors) in the high-voltage box and control relays corresponding to each switch can also be reduced. It can be understood that each switch in the battery device is usually driven in a high-low side driving mode. By reducing the number of pre-charging circuits, the number of switches can be reduced, thereby reducing the number of relays required for high-low side driving of the switches, and further reducing the number of components and simplifying the circuit design, thereby reducing the overall cost, improving the production feasibility, product reliability, and maintenance convenience.

[0138] Continuing to refer to Figure 2 , according to some embodiments of the application, in the case where the first single-pole double-throw switch 610 is in the first state and the second single-pole double-throw switch 620 is in the fourth state, the first battery pack 400 is connected between the first output terminal 110 and the second output terminal 120; in the case where the first single-pole double-throw switch 610 is in the second state and the second single-pole double-throw switch 620 is in the third state, the second battery pack 500 is connected between the first output terminal 110 and the second output terminal 120.

[0139] In the embodiment, the battery device can include multiple working states. In addition to the series connection of the first battery pack and the second battery pack and the parallel connection of the first battery pack and the second battery pack described above, the battery device can also have a single battery pack working mode.

[0140] Taking the first battery pack 400 and the second battery pack 500 as examples, each of which is a 400V battery pack.

[0141] In the case where the first single-pole double-throw switch 610 is in the first state and the second single-pole double-throw switch 620 is in the third state, the first battery pack 400 and the second battery pack 500 are connected in parallel between the first output terminal 110 and the second output terminal 120, and the battery device is in a parallel working state, with an output voltage of 400V.

[0142] In the case where the first single-pole double-throw switch 610 is in the second state and the second single-pole double-throw switch 620 is in the fourth state, the first battery pack 400 and the second battery pack 500 are connected in series between the first output terminal 110 and the second output terminal 120, and the battery device is in a series working state, with an output voltage of 800V.

[0143] In the case that the first single-pole double-throw switch 610 is in the first state and the second single-pole double-throw switch 620 is in the fourth state, the first battery pack 400 is connected between the first output terminal 110 and the second output terminal 120, the second battery pack 500 is disconnected, the battery device is in the first battery pack single working state, and the output voltage is 400V.

[0144] In the case that the first single-pole double-throw switch 610 is in the second state and the second single-pole double-throw switch 620 is in the third state, the second battery pack 500 is connected between the first output terminal 110 and the second output terminal 120, the first battery pack 400 is disconnected, the battery device is in the second battery pack single working state, and the output voltage is 400.

[0145] In the embodiment, the battery device can provide multiple working modes, can be used in different application scenarios, has high versatility, and can continue to work by using other battery packs when any one battery pack fails, thereby improving the reliability of the battery device.

[0146] The embodiment of the application provides a power utilization device, which comprises the battery device 100 in the above embodiment, and the battery device 100 is used to provide electric energy.

[0147] The power utilization device comprises a vehicle (such as a vehicle, an electric vehicle, a ship, a spacecraft, etc.), a display device (such as a mobile phone, a tablet computer, a notebook computer, etc.), an electric toy, an electric tool, etc.

[0148] It can be understood that the power utilization device provided by the application applies any of the battery devices 100 described above, and therefore, the power utilization device has all the beneficial effects of the battery device 100 described above, which will not be described here again.

[0149] The embodiment of the application provides an energy storage device, which comprises the battery device 100 in the above embodiment, and the battery device 100 is used to store electric energy.

[0150] The energy storage device can comprise but is not limited to a centralized energy storage device (for example, a container energy storage device), a distributed energy storage device, a movable energy storage device, a wearable energy storage device, etc.

[0151] It can be understood that the energy storage device provided by the application applies any of the battery devices 100 described above, and therefore, the energy storage device has all the beneficial effects of the battery device 100 described above, which will not be described here again.

[0152] Please refer to Figure 2In some embodiments, the battery device 100 comprises a first battery pack 400, a second battery pack 500, and a switch assembly 600, the switch assembly 600 comprising a first single-pole double-throw switch 610 and a second single-pole double-throw switch 620, the first single-pole double-throw switch 610 being selectively switchable between a first state and a second state, and the second single-pole double-throw switch 620 being selectively switchable between a third state and a fourth state; the battery device 100 having a first output terminal 110 and a second output terminal 120.

[0153] In a case where the first single-pole double-throw switch 610 is in the first state and the second single-pole double-throw switch 620 is in the third state, the first battery pack 400 and the second battery pack 500 are connected in parallel between the first output terminal 110 and the second output terminal 120; in a case where the first single-pole double-throw switch 610 is in the second state and the second single-pole double-throw switch 620 is in the fourth state, the first battery pack 400 and the second battery pack 500 are connected in series between the first output terminal 110 and the second output terminal 120; in a case where the first single-pole double-throw switch 610 is in the first state and the second single-pole double-throw switch 620 is in the fourth state, the first battery pack 400 is connected between the first output terminal 110 and the second output terminal 120; in a case where the first single-pole double-throw switch 610 is in the second state and the second single-pole double-throw switch 620 is in the third state, the second battery pack 500 is connected between the first output terminal 110 and the second output terminal 120.

[0154] In the present embodiment, by using the first single-pole double-throw switch and the second single-pole double-throw switch, and relying on the interlocking function thereof, the situation of battery short circuit caused by misoperation or unexpected disconnection (or connection) of the relay can be effectively improved, and the safety of each battery pack and the circuit system is improved. Moreover, by the interlocking function, the logic of circuit switching can be made more rigorous, the system instability problem caused by logic error is reduced, and the system stability is improved.

[0155] Meanwhile, the circuit structure can be simplified, and the reliability and safety of the system are improved. In addition, the circuit design of the simplified battery device can reduce the overall cost, improve the production feasibility, and better adapt to different voltage platforms and system architectures, and the compatibility and expansibility can be improved, and the universality is improved.

[0156] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized by, comprises: a first battery pack; a second battery pack; a switch assembly including a first single-pole double-throw switch and a second single-pole double-throw switch, the first single-pole double-throw switch being selectively switchable between a first state and a second state, the second single-pole double-throw switch being selectively switchable between a third state and a fourth state; the battery device having a first output terminal and a second output terminal, the first battery pack and the second battery pack being connected in parallel between the first output terminal and the second output terminal when the first single-pole double-throw switch is in the first state and the second single-pole double-throw switch is in the third state; the first battery pack and the second battery pack being connected in series between the first output terminal and the second output terminal when the first single-pole double-throw switch is in the second state and the second single-pole double-throw switch is in the fourth state.

2. The battery device according to claim 1, wherein: the first battery pack and the first single-pole double-throw switch are connected in series between the first output terminal and the second output terminal; the second single-pole double-throw switch and the second battery pack are connected in series between the first output terminal and the second output terminal; and the first single-pole double-throw switch is further connected to the second single-pole double-throw switch.

3. The battery device according to claim 2, wherein: the first single-pole double-throw switch includes a first electrical connection, a first terminal, a second terminal, a third terminal, and a fourth terminal, the first terminal and the second terminal being connected to the first battery pack, the third terminal being connected to the second output terminal, the fourth terminal being connected to the second single-pole double-throw switch, and the first electrical connection being connected between the first terminal and the third terminal or between the second terminal and the fourth terminal; when the first electrical connection is connected between the first terminal and the third terminal, the first single-pole double-throw switch is in the first state, and when the first electrical connection is connected between the second terminal and the fourth terminal, the first single-pole double-throw switch is in the second state.

4. The battery device according to claim 3, wherein: the second single-pole double-throw switch includes a second electrical connection, a fifth terminal, a sixth terminal, a seventh terminal, and an eighth terminal, the fifth terminal and the sixth terminal being connected to the second battery pack, the seventh terminal being connected to the first output terminal, the eighth terminal being connected to the fourth terminal, and the second electrical connection being connected between the fifth terminal and the seventh terminal or between the sixth terminal and the eighth terminal; when the second electrical connection is connected between the fifth terminal and the seventh terminal, the second single-pole double-throw switch is in the third state, and when the second electrical connection is connected between the sixth terminal and the eighth terminal, the second single-pole double-throw switch is in the fourth state.

5. The battery device according to claim 2, wherein: The first single-pole double-throw switch has a first movable part, a first connecting end and a second connecting end, the first movable part is connected with the first battery pack, the first connecting end is connected with the second output terminal, the second connecting end is connected with the second single-pole double-throw switch, and the first movable part is connected with the first connecting end or the second connecting end; When the first movable part is connected with the first connecting end, the first single-pole double-throw switch is in a first state, and when the first movable part is connected with the second connecting end, the first single-pole double-throw switch is in a second state.

6. The battery device according to claim 5, wherein The second single-pole double-throw switch has a second movable part, a third connecting end and a fourth connecting end, the second movable part is connected with the second battery pack, the third connecting end is connected with the first output terminal, the fourth connecting end is connected with the second connecting end, and the second movable part is connected with the third connecting end or the fourth connecting end; When the second movable part is connected with the third connecting end, the second single-pole double-throw switch is in a third state, and when the second movable part is connected with the fourth connecting end, the second single-pole double-throw switch is in a fourth state.

7. The battery device according to claim 2, wherein A first fuse is further connected in series between the first battery pack and the first output terminal or the second output terminal; A second fuse is further connected in series between the second battery pack and the first output terminal or the second output terminal.

8. The battery device according to any one of claims 1-7, wherein The battery device further comprises a first main switch arranged on an output line of the first output terminal, and a pre-charging circuit is arranged in parallel with the first main switch, and the pre-charging circuit comprises a pre-charging resistor and a pre-charging switch arranged in series.

9. The battery device according to any one of claims 1-7, wherein The battery device further comprises a second main switch arranged on an output line of the second output terminal.

10. The battery device according to any one of claims 1-7, wherein When the first single-pole double-throw switch is in the first state and the second single-pole double-throw switch is in the fourth state, the first battery pack is connected between the first output terminal and the second output terminal; When the first single-pole double-throw switch is in the second state and the second single-pole double-throw switch is in the third state, the second battery pack is connected between the first output terminal and the second output terminal.

11. An electrical device, characterized by The power utilization device comprises the battery device according to any one of claims 1-10, and the battery device is used for providing electric energy.

12. An energy storage device, characterized by The energy storage device comprises the battery device according to any one of claims 1-10, and the battery device is used for storing electric energy.

Images