Battery device, electric device and energy storage device

Abstract

This application provides a battery device, an electrical device, and an energy storage device, belonging to the field of batteries. The battery device includes a control unit and multiple battery cells. The control unit can control the opening and closing of a first switch and a second switch. The first switch connects the first and second terminals of different battery cells, and the second switch connects the first and second terminals of the same battery cell. By controlling the opening and closing of the first and second switches, the battery cells can switch between a first state and a second state. In the first state, the first electrode portion and the second electrode portion are connected in series; in the second state, the first electrode portion and the second electrode portion are electrically isolated. This allows for multiple electrical connection methods between the first and second electrode portions of each battery cell and the first and second electrode portions of another battery cell, thereby expanding the application scenarios of the battery device to a certain extent.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device, electrical equipment, and energy storage device. Background Technology

[0002] Energy conservation and emission reduction are key to sustainable social development. Rechargeable batteries, with their ability to store and release energy as needed, are widely used in various electrical devices and energy storage systems, and are an important component in promoting energy transition and sustainable development. For the new energy industry, battery technology is a crucial factor in its development.

[0003] In related technologies, battery devices include multiple battery cells, which are electrically connected to form a battery system. However, the electrical connection method of multiple battery cells is relatively simple and cannot adapt to the needs of battery devices in different application scenarios, thus limiting the application scenarios of battery devices. Utility Model Content

[0004] This application aims to at least address one of the technical problems existing in the background art. Therefore, one objective of this application is to provide a battery device, electrical appliance, and energy storage device to broaden the application scenarios of the battery device.

[0005] An embodiment of the first aspect of this application provides a battery device, including a control unit and a plurality of battery cells. Each battery cell includes a housing, a first electrode portion and a second electrode portion housed within the housing. Two first terminals and two second terminals are provided at one end of the housing along a first direction. The polarities of the first terminals and the second terminals are opposite. The first electrode portion is electrically connected to one of the first terminals and one of the second terminals, and the second electrode portion is electrically connected to the other first terminal and the other second terminal. Each first terminal on one battery cell is connected to each second terminal on another battery cell via a first switch, and one of the first terminals and the other second terminal on each battery cell are connected via a second switch. The control unit can control the opening and closing of the first and second switches to switch the battery cells between a first state and a second state. In the first state, the first electrode portion and the second electrode portion are connected in series; in the second state, the first electrode portion and the second electrode portion are electrically isolated.

[0006] In the technical solution of this application embodiment, by controlling the opening and closing of the first switch and the second switch, the first electrode part and the second electrode part of each battery cell can have multiple electrical connection methods with the first electrode part and the second electrode part of another battery cell. This allows the output voltage of the entire battery device to be flexibly adjusted, thereby expanding the application scenarios of the battery device to a certain extent.

[0007] In some embodiments, both the first electrode portion and the second electrode portion include at least one electrode assembly, and all electrode assemblies are arranged sequentially along a second direction, with the first direction being perpendicular to the second direction; a portion of the electrode assembly in the first electrode portion and the electrode assembly in the second electrode portion are first electrode assemblies, and the remaining portion are second electrode assemblies; the thermal stability of the first electrode assembly is higher than that of the second electrode assembly.

[0008] This embodiment incorporates two electrode components with different stability, namely a first electrode component and a second electrode component, into a single battery cell, thereby improving the thermal stability and low-temperature performance of the battery cell.

[0009] In some embodiments, a single battery cell includes a plurality of first electrode assemblies and a plurality of second electrode assemblies; along a second direction, all the first electrode assemblies are disposed on one side of all the second electrode assemblies.

[0010] In some embodiments, a single battery cell includes a plurality of first electrode assemblies and a plurality of second electrode assemblies; the first electrode assemblies and second electrode assemblies are alternately arranged along a second direction.

[0011] In this embodiment, any two adjacent second electrode components are separated by the first electrode component, and the first electrode component with high thermal stability can prevent the heat from diffusing between the two adjacent second electrode components.

[0012] In some embodiments, both the first electrode portion and the second electrode portion include at least one first electrode assembly and at least one second electrode assembly.

[0013] In some embodiments, the positive electrode active material of the positive electrode sheet of the first electrode assembly includes one or more of lithium iron phosphate, lithium manganese iron phosphate, lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide, and the positive electrode active material of the positive electrode sheet of the second electrode assembly includes one or more of lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide.

[0014] This embodiment allows the characteristics of the lithium iron phosphate chemical system and the ternary chemical system to complement each other, thereby improving the thermal stability and low-temperature performance of the battery cells.

[0015] In some embodiments, the outer casing has an annular shell, the centerline of which is parallel to a first direction, and the wall thickness of the annular shell is greater than or equal to 10 mm and less than or equal to 100 mm. The technical solution of this embodiment achieves a good balance between the structural strength of the annular shell and the volumetric energy density of the battery device.

[0016] In some embodiments, the two first poles and the two second poles are arranged in two rows and two columns.

[0017] In some embodiments, both the first electrode portion and the second electrode portion include two electrode assemblies, and the wall thickness of the annular housing is greater than or equal to 30 mm and less than or equal to 100 mm.

[0018] This embodiment provides four electrode assemblies in a single battery cell. By arranging the four electrode posts in two rows and two columns, the space along the second direction of the casing is fully utilized to arrange the four electrode posts. Compared with the technical solution where the four electrode posts are distributed in a straight line along the third direction, the layout of the four electrode posts can be optimized to avoid being too compact.

[0019] In some embodiments, the first electrode portion includes two adjacent electrode components, with one first electrode post and one second electrode post facing the first electrode portion; the second electrode portion includes two adjacent electrode components, with another first electrode post and another second electrode post facing the second electrode portion.

[0020] In this embodiment, each electrode assembly is opposite to two corresponding posts of opposite polarity, so that it can be easily connected to the corresponding posts.

[0021] In some embodiments, the first electrode portion and the second electrode portion are arranged sequentially along the second direction, and the first direction is perpendicular to the second direction; the housing also includes an end cap, which is disposed at one end of the annular housing along the first direction, and two first pole posts and two second pole posts are disposed on the end cap; the ratio of the size of the first pole post in the second direction and the size of the second pole post in the second direction to the size of the end cap in the second direction is greater than or equal to 1:10 and less than or equal to 1:2.

[0022] By adopting the technical solution of this embodiment, the flow area of ​​the first pole and the second pole can be large, while the first pole and the second pole will not exceed the edge of the end cover along the second direction.

[0023] In some embodiments, the first electrode portion and the second electrode portion are arranged sequentially along the second direction, and the two first pole posts and the two second pole posts are arranged sequentially and spaced apart along the third direction, with the first direction, the second direction and the third direction being perpendicular to each other.

[0024] In some embodiments, both the first electrode portion and the second electrode portion include an electrode assembly, and the wall thickness of the annular housing is greater than or equal to 10 mm and less than or equal to 50 mm.

[0025] With the four terminals distributed in a straight line along the third direction, by designing that both the first electrode section and the second electrode section include an electrode assembly, and with the four terminals located in the middle of the casing along the second direction, each electrode assembly of the battery cell is opposite to the four terminals, so that it can be easily connected to the corresponding terminals.

[0026] In some embodiments, the housing further includes an end cap disposed at one end of the annular housing along a first direction, with two first poles and two second poles disposed on the end cap; the ratio of the dimensions of the first poles and the second poles in the second direction to the dimensions of the end cap in the second direction is greater than or equal to 1:5 and less than or equal to 4:5.

[0027] By adopting the technical solution of this embodiment, the flow area of ​​the first pole and the second pole can be large, while the first pole and the second pole will not exceed the edge of the end cover along the second direction.

[0028] An embodiment of the second aspect of this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0029] An embodiment of the third aspect of this application provides an energy storage device that includes the battery device described above, the battery device being capable of storing and providing electrical energy.

[0030] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0031] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the various drawings denote the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings depict only some embodiments disclosed in this application and should not be construed as limiting the scope of this application.

[0032] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0033] Figure 2 This is an exploded view of the battery device according to some embodiments of this application;

[0034] Figure 3 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application;

[0035] Figure 4 for Figure 3 A schematic cross-sectional view of a single battery cell is shown.

[0036] Figure 5 This is a cross-sectional schematic diagram of a battery cell according to other embodiments of this application;

[0037] Figures 6 to 9 This is a schematic diagram of the circuit connection of a battery device provided in some embodiments of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1000 vehicles;

[0040] Battery unit 100, controller 200, motor 300;

[0041] Battery cell assembly 10, battery cell 11, first battery cell 11A, second battery cell 11B, third battery cell 11C, housing 110, annular housing 111, end cap 112, first electrode portion 120, second electrode portion 130, electrode assembly 140, first electrode assembly 140a, second electrode assembly 140b, first terminal post 150, first positive terminal post 150a, second positive terminal post 150b, second terminal post 160, first negative terminal post 160a, second negative terminal post 160b;

[0042] Box 20, first box 21, second box 22. Detailed Implementation

[0043] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0044] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0045] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0046] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0047] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0049] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to 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 embodiments of this application.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation", "connection", "linking", and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components.

[0051] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0052] Currently, the application of rechargeable batteries is becoming increasingly widespread, judging from market trends. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in various electronic devices, such as electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As the application areas of rechargeable batteries continue to expand, the market demand is also constantly increasing.

[0053] In traditional battery systems, the battery device consists of multiple battery cells connected in a simple series or parallel manner, resulting in a fixed output voltage that cannot be flexibly adjusted. This makes it difficult for the battery device to adapt to the needs of different voltage platforms, thus limiting its application scenarios.

[0054] To address the limitation of battery device applications, related technologies design each battery cell with two jelly rolls (JRs). Each jelly roll is electrically connected to two terminals, meaning each battery cell has four terminals located at different ends. The negative terminal of one jelly roll is connected to the positive terminal of another jelly roll via a switch, and the negative terminal of one battery cell is also connected to the positive terminal of another battery cell via a switch. By controlling the opening and closing of these switches, each jelly roll in each battery cell can be connected to an external circuit to supply power to a load, or it can remain unconnected. This allows for flexible adjustment of the battery device's output voltage, expanding its applicable scenarios.

[0055] However, since the four terminals are located at different ends of the battery cell, connecting two cores of the same battery cell or two cores of different battery cells often requires using wires to connect the two terminals with opposite polarities at different ends. The wires need to extend from one end of the battery cell to the opposite end, resulting in long-distance wiring and complex battery device wiring. Therefore, how to simplify the wiring of the battery device while expanding its application scenarios is a problem worthy of attention.

[0056] Based on the above considerations, this application designs a battery device comprising a battery cell having a first electrode portion and a second electrode portion, the battery cell switching between a first state and a second state. In the first state, the first electrode portion and the second electrode portion are connected in series. In the second state, the first electrode portion and the second electrode portion are electrically isolated. In such a battery cell, the first electrode portion and the second electrode portion can selectively supply power to an external load, thereby expanding the application scenarios of the battery device to a certain extent. Furthermore, the four terminals of the battery cell are located at the same end of the casing, which reduces the wiring distance and simplifies the wiring of the battery device.

[0057] The battery devices described in this application can be used, but are not limited to, in electrical equipment or energy storage devices such as vehicles, ships, or aircraft. A power system comprising the battery cells and battery devices described in this application can be used to construct such electrical equipment or energy storage devices.

[0058] The energy storage device utilizing a battery as a power system in this application embodiment can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems, etc. The energy storage device can store electrical energy as needed and output it at appropriate times. For example, the energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. The energy storage device provided in this application embodiment can be used in any power system that requires energy storage.

[0059] In some embodiments, the energy storage device is an energy storage container, an energy storage cabinet, an energy storage power station, an energy storage battery pack, or a portable energy storage system.

[0060] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet. Each battery cluster may include multiple battery units connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, these clusters are connected in parallel to increase the capacity of the energy storage device.

[0061] In this application embodiment, the electrical devices using battery devices as power sources can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0062] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0063] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0064] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0065] Figure 2 A schematic diagram of the structure of a battery device 100 according to an embodiment of this application is shown. Figure 2 As shown, the battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies 10 for providing voltage and capacity. The battery cell assembly 10 may include multiple battery cells 11, which are connected in series, parallel, or mixed connection via a busbar.

[0066] In some embodiments, the battery cell assembly 10 is typically formed by arranging a plurality of battery cells 11.

[0067] As an example, the battery cell assembly 10 can be a battery module, which is formed by arranging and fixing multiple battery cells 11 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 11 together with cable ties.

[0068] In some embodiments, such as Figure 2 As shown, the battery device 100 can be a battery pack, which includes a housing 20 and one or more individual battery cells 10, with the individual battery cells 10 housed within the housing 20. The housing 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or a complex three-dimensional structure composed of combinations of simple cuboids, cylinders, or spheres. The material of the housing 20 can be an alloy such as aluminum alloy or iron alloy, a polymer such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0069] As an example, the battery cell assembly 10 can be a battery module, and the battery cell assembly 10 can be housed in the housing 20 by fixing the battery module in the housing 20.

[0070] As an example, the battery cell assembly 10 can also be housed in the housing 20 by directly fixing multiple battery cells 11 to the housing 20.

[0071] As an example, the housing 20 may include a first housing 21 and a second housing 22. The first housing 21 and the second housing 22 are fastened together to form a closed space inside the housing 20 to house the battery cell assembly 10. Here, "closed" refers to covering or closing, and can be either non-sealed or sealed to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11. The first housing 21 may be a top cover or a bottom plate.

[0072] As an example, the housing 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 20 forms an enclosed space to house the battery cell assembly 10.

[0073] In some embodiments, the housing 20 may be part of the vehicle's chassis structure. For example, a portion of the housing 20 may be at least a portion of the vehicle's floor, or a portion of the housing 20 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0074] The battery cell 11 provided in the embodiments of this application can be a secondary battery. A secondary battery refers to a battery cell 11 that can be used again after being discharged by recharging to activate the active material.

[0075] The battery cell 11 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. As an example, the battery cell 11 can be a cylindrical battery cell, a prismatic battery cell, or a battery cell 11 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells, etc., and this application has no particular limitation.

[0076] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application. Figure 4 for Figure 3 The diagram shows a cross-sectional view of a single battery cell. Figure 5 This is a cross-sectional schematic diagram of a battery cell according to other embodiments of this application. For example... Figures 3 to 5 As shown, the battery cell 11 provided in the embodiments of this application includes a casing 110, a first electrode portion 120, a second electrode portion 130, and an electrolyte. The first electrode portion 120 and the second electrode portion 130 are components in the battery cell 11 where electrochemical reactions occur. The first electrode portion 120, the second electrode portion 130, and the electrolyte are housed within the casing 110. As an example, the electrolyte may be liquid, gel-like, or solid.

[0077] As an example, the outer casing 110 can be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the outer casing 110 can be a sealed structure or a non-sealed structure. As an example, when the outer casing 110 is a non-sealed structure, the outer casing 110 serves to protect the electrode assembly 140, and a sealing bag is also included between the outer casing 110 and the electrode assembly 140. The sealing bag is used to encapsulate the electrode assembly 140 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the outer casing 110 is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0078] Please continue to refer to this. Figures 3 to 5 The outer casing 110 has four terminals at one end along a first direction. The four terminals include two first terminals 150 and two second terminals 160. The polarities of the first terminals 150 and the second terminals 160 are opposite. A first electrode portion 120 is electrically connected to one of the first terminals 150 and one of the second terminals 160. A second electrode portion 130 is electrically connected to the other first terminal 150 and the other second terminal 160. Each first terminal 150 on one battery cell 11 is connected to each second terminal 160 on another battery cell 11 via a first switch. One first terminal 150 and another second terminal 160 on each battery cell 11 are connected via a second switch.

[0079] The battery device 100 also includes a control unit capable of controlling the opening and closing of a first switch and a second switch to switch the battery cell 11 between a first state and a second state. In the first state, the first electrode portion 120 and the second electrode portion 130 are connected in series. In the second state, the first electrode portion 120 and the second electrode portion 130 are electrically isolated.

[0080] For example, the first direction can refer to the gravity direction Z of the battery cell 11. The "gravity direction" can refer to the direction of gravity when the battery cell 11 is installed in the battery device 100. In this state, the two first terminals 150 and the two second terminals 160 are located at the top of the housing 110 and away from the bottom plate of the box, or located at the bottom of the housing 110 and facing the bottom plate of the box.

[0081] In this configuration, the two first terminals 150 can be positive terminals, and correspondingly, the two second terminals 160 can be negative terminals. Alternatively, the two first terminals 150 can be negative terminals, and correspondingly, the two second terminals 160 can be positive terminals. In general, the outer casing 110 has two positive terminals and two negative terminals. The two positive terminals are designated as first positive terminal 150a and second positive terminal 150b, and the two negative terminals are designated as first negative terminal 160a and second negative terminal 160b.

[0082] Both the first electrode portion 120 and the second electrode portion 130 include at least one electrode assembly 140. The electrode assembly 140 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked. The electrode assembly 140 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell 11, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode. The separator is disposed between the positive and negative electrode to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through. The portions of the positive and negative electrode with active material constitute the main body of the electrode assembly 140, the portion of the positive electrode without active material constitutes the positive tab, and the portion of the negative electrode without active material constitutes the negative tab.

[0083] In some examples, the positive tab of the first electrode portion 120 is electrically connected to the first positive terminal 150a, and the negative tab is electrically connected to the first negative terminal 160a; the positive tab of the second electrode portion 130 is electrically connected to the second positive terminal 150b, and the negative tab is electrically connected to the second negative terminal 160b. In other examples, the positive tab of the first electrode portion 120 is electrically connected to the second positive terminal 150b, and the negative tab is electrically connected to the second negative terminal 160b; the positive tab of the second electrode portion 130 is electrically connected to the first positive terminal 150a, and the negative tab is electrically connected to the first negative terminal 160a. The first terminal 150 and the second terminal 160 can be connected to the tabs by soldering or by an adapter plate.

[0084] All first switches and all second switches are electrically connected to the control unit, which can control the opening and closing of any one of the first switches and any one of the second switches. The control unit can be the battery management system (BMS) of the battery device 100, or other control devices that can generate operation control signals according to instruction operation codes and timing signals, and complete instruction fetching and execution, and the control device is communicatively connected to the battery management system.

[0085] Figures 6 to 9 This is a circuit connection diagram of a battery device 100 provided in some embodiments of this application. Please refer to... Figures 6 to 9The diagram shows three battery cells 11, designated as a first battery cell 11A, a second battery cell 11B, and a third battery cell 11C. Each negative terminal of the first battery cell 11A is connected to each positive terminal of the second battery cell 11B via a first switch. Therefore, four first switches S1, S2, S3, and S4 are provided between the first battery cells 11A and 11B. Similarly, each negative terminal of the second battery cell 11B is connected to each positive terminal of the third battery cell 11C via a first switch. Therefore, four first switches S5, S6, S7, and S8 are provided between the second battery cells 11B and 11C. The first negative terminal 160a and the second positive terminal 150b of each of the three battery cells 11 are connected via a second switch. Figures 6 to 8 In the middle, each of the three battery cells 11 corresponds to a second switch, and the three second switches are K1, K2 and K3 respectively.

[0086] It is understood that the battery device 100 of this embodiment has a variety of application scenarios, and some application scenarios are described in detail below.

[0087] In a scenario, such as Figure 6 As shown, the control unit controls the three second switches K1, K2, and K3 to close, controls the first switch S3 between the second negative terminal 160b of the first battery cell 11A and the first positive terminal 150a of the second battery cell 11B to close, and controls the first switch S7 between the second negative terminal 160b of the second battery cell 11B and the first positive terminal 150a of the third battery cell 11C to close. The remaining first switches S1, S2, S4, S5, S6, and S8 are all open, which allows the first electrode portion 120 and the second electrode portion 130 of each battery cell 11 to be connected in series, and all first electrode portions 120 and all second electrode portions 130 are connected in series. The first positive terminal 150a of the first battery cell 11A and the second negative terminal 160b of the third battery cell 11C are respectively connected to an external circuit, so that the first electrode portions 120 and the second electrode portions 130 of all battery cells 11 are connected in series and form a loop with the external circuit. Taking the discharge voltage of the first electrode 120 and the second electrode 130 as an example, both are 200 volts (V). In this scenario, each battery cell 11 can provide 400V voltage to the load through an external circuit. In this way, the battery device 100 can output a higher voltage, which can meet the high voltage usage requirements.

[0088] In a scenario, such as Figure 7As shown, the control unit controls the three second switches K1, K2, and K3 to open, and controls the first switch S1 between the first negative terminal 160a of the first battery cell 11A and the first positive terminal 150a of the second battery cell 11B to close, and the first switch S5 between the first negative terminal 160a of the second battery cell 11B and the first positive terminal 150a of the third battery cell 11C to close, so that the first electrode portions 120 of each battery cell 11 are connected in series. Simultaneously, the control unit also controls the first switch S4 between the second negative terminal 160b of the first battery cell 11A and the second positive terminal 150b of the second battery cell 11B to close, and the first switch S8 between the second negative terminal 160b of the second battery cell 11B and the second positive terminal 150b of the third battery cell 11C to close, so that the second electrode portions 130 of each battery cell 11 are also connected in series. The remaining first switches S2, S3, S6, and S7 are open. In this configuration, the first positive terminal 150a of the first battery cell 11A and the first negative terminal 160a of the third battery cell 11C are each connected to an external circuit, and the second positive terminal 150b of the first battery cell 11A and the second negative terminal 160b of the third battery cell 11C are each connected to another external circuit. This allows the first electrode portions 120 of all battery cells 11 to be connected in series and form a loop with the external circuit, and the second electrode portions 130 of all battery cells 11 to be connected in series and form a loop with the external circuit. Taking a discharge voltage of 200 volts (V) for both the first electrode portion 120 and the second electrode portion 130 as an example, in this scenario, each battery cell 11 can provide 200V to one external circuit and simultaneously provide 200V to another external circuit.

[0089] In a scenario, such as Figure 8 As shown, the control unit controls the three second switches K1, K2, and K3 to open, controls the first switch S2 between the first negative terminal 160a of the first battery cell 11A and the second positive terminal 150b of the second battery cell 11B to close, and controls the first switch S8 between the second negative terminal 160b of the second battery cell 11B and the second positive terminal 150b of the third battery cell 11C to close, so that the first electrode portion 120 of the first battery cell 11A, the second electrode portion 130 of the second battery cell 11B, and the second electrode portion 130 of the third battery cell 11C are connected in series. Simultaneously, the control unit also controls the first switch S3 between the second negative terminal 160b of the first battery cell 11A and the first positive terminal 150a of the second battery cell 11B to close, and the first switch S5 between the first negative terminal 160a of the second battery cell 11B and the first positive terminal 150a of the third battery cell 11C to close, so that the second electrode portion 130 of the first battery cell 11A, the first electrode portion 120 of the second battery cell 11B, and the first electrode portion 120 of the third battery cell 11C are connected in series. The remaining first switches S1, S4, S6, and S7 are open.

[0090] In a scenario, such as Figure 9 As shown, the control unit controls the second switches K1 and K3 to open, the second switch K2 to close, the first switch S1 between the first negative terminal 160a of the first battery cell 11A and the first positive terminal 150a of the second battery cell 11B to close, the first switch S8 between the second negative terminal 160b of the second battery cell 11B and the second positive terminal 150b of the third battery cell 11C to close, and the remaining first switches S2, S3, S4, S5, S6, and S7 to open, so that the first electrode portion 120 of the first battery cell 11A, the first electrode portion 120 of the second battery cell 11B, the second electrode portion 130 of the second battery cell 11B, and the second electrode portion 130 of the third battery cell 11C are connected in series.

[0091] Understandable, combined Figures 6 to 9 As can be seen, the control unit controls the opening and closing of each first switch and the second switch, and there are multiple electrical connection methods between the first electrode part 120 and the second electrode part 130 of each battery cell 11. These will not be listed one by one in this embodiment.

[0092] In general, the control unit controls the opening and closing of each first and second switch, allowing each battery cell 11 to switch between a first state and a second state. In the second state, the first electrode portion 120 and the second electrode portion 130 are electrically isolated; "electrically isolated" means that no current path is formed between the first electrode portion 120 and the second electrode portion 130. It can be understood that in the second state, the first electrode portion 120 and the second electrode portion 130 can be connected to different external circuits, or one of the first electrode portion 120 and the second electrode portion 130 can be connected to an external circuit (taking a discharge voltage of 200V for both the first electrode portion 120 and the second electrode portion 130 as an example, the discharge voltage of the battery cell 11 is 200V).

[0093] In this embodiment of the battery device 100, each battery cell 11 has a first electrode post 150 connected to the first electrode portion 120 and a second electrode post 160 connected to the second electrode portion 130, which are connected via a second switch. By controlling the opening and closing of the second switch, the first electrode portions 120 and second electrode portions 130 of each battery cell 11 can be selectively connected in series, thereby adjusting the output voltage of each battery cell 11. Furthermore, each first electrode post 150 of one battery cell 11 is connected to the two second electrode posts 160 of another battery cell 11 via a first switch. By controlling the opening and closing of the first switch, multiple electrical connection methods can be achieved between the first electrode portions 120 and second electrode portions 130 of each battery cell 11 and the first electrode portions 120 and second electrode portions 130 of another battery cell 11, thus allowing for flexible adjustment of the output voltage of the entire battery device 100. Therefore, in the technical solution of this application embodiment, the battery device 100 can meet the voltage application requirements of different application scenarios, thereby expanding the application scenarios of the battery device 100 to a certain extent.

[0094] Furthermore, since the two first terminals 150 and the two second terminals 160 are located at the same end of the housing 110 along the first direction, the wires connecting the first terminals 150 and the second terminals 160 do not need to cross from one end of the housing 110 along the first direction to the other end. The wires only need to be laid at the end where the first terminals 150 and the second terminals 160 are located, which reduces the wire routing distance and simplifies the wiring of the battery device 100. Because the wire routing distance is reduced, the current path between the first terminals 150 and the second terminals 160 is reduced, which helps to improve the charging and discharging power.

[0095] In summary, the technical solutions of this application not only expand the application scenarios of the battery device 100, but also simplify the wiring of the battery device 100.

[0096] According to some embodiments of this application, both the first electrode portion 120 and the second electrode portion 130 include at least one electrode assembly 140, and all electrode assemblies 140 are arranged sequentially along a second direction, wherein the first direction is perpendicular to the second direction. A portion of the electrode assembly 140 in the first electrode portion 120 and the electrode assembly 140 in the second electrode portion 130 is a first electrode assembly 140a, and the remaining portion is a second electrode assembly 140b. The thermal stability of the first electrode assembly 140a may be higher than that of the second electrode assembly 140b.

[0097] In some examples, the positive electrode, negative electrode, and separator are wound to form a wound structure and then flattened to obtain a flat electrode assembly. The first direction can be referred to as the axial direction Z of the flat electrode assembly, and the second direction can be referred to as the thickness direction X of the flat electrode assembly.

[0098] In this embodiment, the number of electrode components 140 included in the first electrode portion 120 can be one, two, three, or more, and the number of electrode components 140 included in the second electrode portion 130 can be one, two, three, or more. That is, the battery cell 11 includes multiple electrode components 140, some of which are first electrode components 140a, and the remaining parts are second electrode components 140b. For example, as... Figure 4 and Figure 5 As shown, both the first electrode section 120 and the second electrode section 130 include two electrode assemblies 140. The two electrode assemblies 140 of the first electrode section 120 and the second electrode section 130 can be any of the following: both electrode assemblies 140 are either first electrode assembly 140a or second electrode assembly 140b; one electrode assembly is the first electrode assembly 140a and the other is the second electrode assembly 140b, as long as the battery cell 11 simultaneously includes both the first electrode assembly 140a and the second electrode assembly 140b. The first electrode assembly 140a and the second electrode assembly 140b have different chemical systems. The first electrode assembly 140a has higher thermal stability than the second electrode assembly 140b. Thermal stability can be understood as the ability to avoid violent reactions at high temperatures. A battery cell 11 with higher thermal stability is less prone to thermal runaway at high temperatures.

[0099] This embodiment incorporates two electrode components 140 with different stability, a first electrode component 140a and a second electrode component 140b, into the battery cell 11. In practical implementation, if thermal runaway occurs in the battery cell 11, the more thermally stable first electrode component 140a can effectively prevent heat from diffusing to the less thermally stable second electrode component 140b, thereby reducing the intensity of the chemical reaction in the second electrode component 140b to a certain extent. Compared to a battery cell 11 containing only the second electrode component 140b, the battery cell 11 in this embodiment has higher thermal stability; compared to a battery cell 11 containing only the first electrode component, the low-temperature performance of the battery cell 11 in this embodiment is improved.

[0100] According to some embodiments of this application, the battery cell 11 may include a plurality of first electrode assemblies 140a and a plurality of second electrode assemblies 140b, that is, the battery cell 11 is provided with four or more electrode assemblies 140. Figure 4 As shown, along the second direction, all first electrode assemblies 140a can be disposed on one side of all second electrode assemblies 140b.

[0101] In some examples, both the first electrode portion 120 and the second electrode portion 130 include a first electrode assembly 140a and a second electrode assembly 140b. Taking the example that both the first electrode portion 120 and the second electrode portion 130 include two electrode assemblies 140, in this example, the first electrode assembly 140a and the second electrode assembly 140b of the first electrode portion 120 can be spaced apart along a second direction, with the first electrode assembly 140a of the second electrode portion 130 located between them, so that all the first electrode assemblies 140a are located on one side of all the second electrode assemblies 140b.

[0102] In other examples, the first electrode portion 120 may include a plurality of first electrode assemblies 140a stacked along a second direction, and the second electrode portion 130 may include a plurality of second electrode assemblies 140b stacked along a second direction. In this example, the first electrode portion 120 is located on one side of the second electrode portion 130 along the second direction. Figure 4 In the first electrode section 120, two first electrode assemblies 140a are included, and the second electrode section 130 includes two second electrode assemblies 140b.

[0103] Compared with the technical solution where both the first electrode section 120 and the second electrode section 130 include the first electrode assembly 140a and the second electrode assembly 140b, in this embodiment, since the first electrode section 120 only includes the first electrode assembly 140a and the second electrode section 130 only includes the second electrode assembly 140b, depending on the different usage requirements, by controlling the opening and closing of the first switch and the second switch, only the first electrode assembly 140a or only the second electrode assembly 140b can be connected to the external circuit.

[0104] According to some embodiments of this application, the battery cell 11 includes a plurality of first electrode assemblies 140a and a plurality of second electrode assemblies 140b, that is, the battery cell 11 is provided with four or more electrode assemblies 140. Figure 5 As shown, along the second direction, the first electrode assembly 140a and the second electrode assembly 140b are alternately arranged. Figure 5 In the middle, two first electrode assemblies 140a and two second electrode assemblies 140b are alternately distributed along the second direction.

[0105] By alternating the arrangement of the first electrode assembly 140a and the second electrode assembly 140b, any two adjacent second electrode assemblies 140b are separated by the first electrode assembly 140a. Thus, in practical implementation, the thermally stable first electrode assembly 140a can prevent heat diffusion between adjacent second electrode assemblies 140b and prevent heat accumulation between them, thereby reducing the possibility of escalating thermal runaway due to a chain reaction.

[0106] In some embodiments, the first electrode portion 120 may include only a plurality of first electrode components 140a spaced apart along the second direction, and the second electrode portion 130 may include only a plurality of second electrode components 140b spaced apart along the second direction.

[0107] According to some embodiments of this application, both the first electrode portion 120 and the second electrode portion 130 include at least one first electrode assembly 140a and at least one second electrode assembly 140b. In this embodiment, both the first electrode portion 120 and the second electrode portion 130 include two types of electrode assemblies 140 with different stability: the first electrode assembly 140a and the second electrode assembly 140b. Furthermore, the plurality of electrode assemblies 140 of the first electrode portion 120 are stacked along a second direction, and the plurality of electrode assemblies 140 of the second electrode portion 130 are also stacked along a second direction.

[0108] Of course, in other embodiments of this application, all the second electrode components 140b may also be located between two first electrode components 140a. In this way, the entire assembly formed by all the second electrode components 140b is covered on both sides by the first electrode components 140a, which have higher thermal stability.

[0109] According to some embodiments of this application, the positive electrode active material of the positive electrode sheet of the first electrode assembly 140a includes one or more of lithium iron phosphate, lithium manganese iron phosphate, lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide, and the positive electrode active material of the positive electrode sheet of the second electrode assembly 140b includes one or more of lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide.

[0110] In this embodiment, the positive electrode of the first electrode assembly 140a is a lithium iron phosphate chemical system, and the positive electrode of the second electrode assembly 140b is a ternary material chemical system. For example, the positive active material of the positive electrode of the first electrode assembly 140a is lithium iron phosphate (LFP), and the positive active material of the positive electrode of the second electrode assembly 140b is lithium nickel cobalt manganese oxide (NCM).

[0111] This embodiment incorporates an electrode assembly 140 with both lithium iron phosphate and ternary material chemical systems in the battery cell 11, allowing the characteristics of the lithium iron phosphate and ternary chemical systems to complement each other. Compared to a battery cell 11 with an electrode assembly 140 containing only the lithium iron phosphate chemical system, the battery cell 11 in this embodiment exhibits improved low-temperature performance; compared to a battery cell 11 with an electrode assembly 140 containing only the ternary chemical system, the battery cell 11 in this embodiment has higher thermal stability. In summary, this embodiment can improve the thermal stability and low-temperature performance of the battery cell 11 to a certain extent.

[0112] According to some embodiments of this application, the outer casing 110 has an annular shell 111, the centerline of the annular shell 111 is parallel to a first direction, and the wall thickness of the annular shell 111 is greater than or equal to 10 mm and less than or equal to 100 mm.

[0113] Specifically, the shape of the annular housing 111 can be determined according to the specific shape and size of the electrode assembly 140. For example, the electrode assembly 140 can be cylindrical, and the annular housing 111 can be cylindrical. Alternatively, the electrode assembly 140 can be flat, and the annular housing 111 can be cuboid. Yet another example is that the electrode assembly 140 can be polygonal, and the annular housing 111 can also be polygonal. The material of the annular housing 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment does not impose any special limitations on this.

[0114] The wall thickness of the annular shell 111 refers to the normal distance between the inner surface and the outer surface of the annular shell 111. The wall thickness of the annular shell 111 can be equal or nearly equal everywhere. In some examples, such as... Figure 3 As shown, the annular shell 111 is cuboid in shape. The annular shell 111 includes two first sidewalls arranged opposite each other along a second direction and two second sidewalls arranged opposite each other along a third direction. Along the outer periphery of the first electrode portion 120 and the second electrode portion 130, the first sidewalls and the second sidewalls are alternately arranged and connected. The dimension of the first sidewall along the second direction and the dimension of the second sidewall along the third direction are the wall thickness of the annular shell 111. In this example, the first direction, the second direction and the third direction are perpendicular to each other. The second direction can be referred to as the width direction X of the cuboid annular shell 111, and the third direction can be referred to as the length direction Y of the cuboid annular shell 111.

[0115] The wall thickness of the annular shell 111 can be in the range of 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm or any combination thereof.

[0116] By making the wall thickness of the annular shell 111 greater than or equal to 10 mm, the annular shell 111 can have higher structural strength and is less prone to deformation under compression and impact. By making the wall thickness of the annular shell 111 less than or equal to 100 mm, the volume occupied by the outer shell 110 in the box is smaller, so that the volumetric energy density of the battery device 100 can be maximized.

[0117] According to some embodiments of this application, the first electrode portion 120 and the second electrode portion 130 are arranged sequentially along the second direction, and the two first pole posts 150 and the two second pole posts 160 can be arranged sequentially and spaced apart along the third direction, with the first direction, the second direction and the third direction being perpendicular to each other.

[0118] In some examples, the positive electrode, negative electrode, and separator are wound into a spiral structure and then flattened to obtain a flat electrode assembly 140, with the third direction referring to the length direction Y of the flat electrode assembly 140. In this embodiment, the four posts are linearly distributed along a direction perpendicular to the thickness direction of the flat electrode assembly 140.

[0119] The four poles can be located at the center of the housing 110 along a third direction, or they can be located away from the center of the housing 110 along a third direction.

[0120] According to some embodiments of this application, in the case where the four electrode posts are distributed in a straight line along a third direction, the first electrode portion 120 and the second electrode portion 130 each include an electrode assembly 140, and the wall thickness of the annular housing 111 can be greater than or equal to 10 mm and less than or equal to 50 mm.

[0121] In this embodiment, the battery cell 11 includes two electrode assemblies 140 (a first electrode assembly 140a and a second electrode assembly 140b). Exemplarily, the four terminals can be symmetrically arranged about the central plane of the cuboid housing 110, and the first electrode assembly 140a and the second electrode assembly 140b are also symmetrically arranged about this central plane. The central plane refers to a plane passing through the center of the cuboid housing 110 and perpendicular to the second direction. In this example, portions of the first electrode assembly 140a and the second electrode assembly 140b are directly opposite the four terminals, allowing for easy connection to the corresponding terminals.

[0122] The wall thickness of the annular shell 111 can be a range of 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, or any combination thereof.

[0123] For example, when the battery cell 11 includes four electrode assemblies 140 stacked along the second direction, the four electrode assemblies 140 can be symmetrically arranged about the central face. The two middle electrode posts of the four electrode assemblies 140 are directly opposite each other, while the other two electrode assemblies 140 are not opposite each other. Then, the other two electrode assemblies 140 located on the outer side of the four electrode assemblies 140 can be connected to the corresponding electrode posts through the adapter.

[0124] As can be seen from the above description, when the four terminals are distributed in a straight line along the third direction, by designing that both the first electrode section 120 and the second electrode section 130 include an electrode assembly 140, and when the four terminals are located in the middle of the housing 110 along the second direction, each electrode assembly 140 of the battery cell 11 is opposite to the four terminals, so that it can be easily connected to the corresponding terminals without the need for an additional adapter for connection.

[0125] Based on this, by designing the wall thickness of the annular shell 111 to be greater than or equal to 10 mm, the expansion force generated by the expansion of the two electrode components 140 during actual implementation will not cause the annular shell 111 to break. Simultaneously, by designing the wall thickness of the annular shell 111 to be less than or equal to 50 mm, the volumetric energy density of the battery device 100 can be maximized. Furthermore, the smaller wall thickness of the annular shell 111 in this embodiment results in better heat dissipation.

[0126] According to some embodiments of this application, the outer casing 110 may further include an end cap 112, which is disposed at one end of the annular casing 111 along a first direction. Two first pole posts 150 and two second pole posts 160 are disposed on the end cap 112. The ratio of the dimension D1 of the first pole post 150 and the dimension D2 of the second pole post 160 in the second direction to the dimension W of the end cap 112 in the second direction can both be greater than or equal to 1:5 and less than or equal to 4:5.

[0127] End cap 112 refers to a component that covers the opening of the annular housing 111 to isolate the internal environment of the battery cell 11 from the external environment. In any case, the shape of the end cap 112 can be adapted to the shape of the annular housing 111 to fit it. Optionally, the end cap 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 112 is less prone to deformation under pressure and impact, enabling the battery cell 11 to have higher structural strength and improved thermal stability.

[0128] It is understood that there may be one or two end caps 112. In some examples, the outer shell 110 also includes an end wall, with one end of the annular shell 111 integrally formed with the end wall; in this example, there is one end cap 112. Of course, in other embodiments, the four poles may also be provided on the end wall. In other examples, there are two end caps 112, with the two end caps 112 respectively covering the openings at both ends of the annular shell 111; in this example, the four poles may be provided on either end cap 112.

[0129] The electrode post can be cylindrical, in which case the dimension D1 of the first electrode post 150 in the second direction is the diameter of the first electrode post 150, and the dimension D2 of the second electrode post 160 in the second direction is the diameter of the second electrode post 160. Of course, in other embodiments, the electrode post can also be cuboid, cube, etc., and this embodiment does not impose specific limitations on this.

[0130] D1 / W can be any value from 1:5, 2:5, 1:2, 3:5, 2:3, 3.5:5, and 4:5, and D2 / W can be any value from 1:5, 2:5, 1:2, 3:5, 2:3, 3.5:5, and 4:5. D1 and D2 can be equal or unequal.

[0131] By ensuring that both D1 / W and D2 / W are greater than 1:5, the dimensions of the first pole piece 150 and the second pole piece 160 in the second direction are not too small, thus allowing for a larger flow area for both pole pieces 150 and 160. By ensuring that both D1 / W and D2 / W are less than 4:5, the first pole piece 150 and the second pole piece 160 do not extend beyond the edge of the end cap 112 along the second direction.

[0132] According to some embodiments of this application, such as Figure 3 As shown, the two first poles 150 and the two second poles 160 can be arranged in two rows and two columns.

[0133] In other words, two positive and two negative terminals are arranged in two rows, each row consisting of two terminals (e.g., two first terminals 150 / two second terminals 160 / one first terminal 150 and one second terminal 160) distributed along a third direction, with the two rows spaced apart along the second direction. For example, as shown... Figure 3 As shown, the first positive terminal 150a and the first negative terminal 160a are spaced apart and arranged in a row along a third direction, the second positive terminal 150b and the second negative terminal 160b are spaced apart and arranged in another row along a third direction, and the first positive terminal 150a and the second negative terminal 160b are spaced apart and arranged in a column along a second direction, and the first negative terminal 160a and the second positive terminal 150b are spaced apart and arranged in another column along a second direction.

[0134] The four poles can be arranged symmetrically about the central plane, or the distances between the two rows of poles and the central plane in the second direction can be different.

[0135] In some examples, both the first electrode portion 120 and the second electrode portion 130 include an electrode assembly 140, with a first positive electrode post 150a and a first negative electrode post 160a arranged in a row facing one electrode assembly 140, and a second positive electrode post 150b and a second negative electrode post 160b arranged in a row facing another electrode assembly 140.

[0136] According to some embodiments of this application, the first electrode portion 120 and the second electrode portion 130 each include two electrode assemblies 140, and the wall thickness of the annular housing 111 can be greater than or equal to 30 mm and less than or equal to 100 mm.

[0137] In some embodiments, the two electrode assemblies 140 of the first electrode portion 120 and the second electrode portion 130 can be any of the following: both electrode assemblies 140 are first electrode assembly 140a / second electrode assembly 140b; one electrode assembly 140 is the first electrode assembly 140a and the other electrode assembly 140 is the second electrode assembly 140b, as long as the battery cell 11 includes both the first electrode assembly 140a and the second electrode assembly 140b.

[0138] The wall thickness of the annular shell 111 can be a range of 30mm, 40mm, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm or any combination thereof.

[0139] In this embodiment, the battery cell 11 is provided with four electrode assemblies 140. Based on this, by arranging the four electrode posts in two rows and two columns, the space of the outer casing 110 along the second direction is fully utilized to arrange the four electrode posts. Compared with the technical solution of the four electrode posts being distributed in a straight line along the third direction, the layout of the four electrode posts can be optimized to avoid being too compact.

[0140] Furthermore, by designing the wall thickness of the annular housing 111 to be greater than or equal to 30 mm, the expansion force generated by the expansion of the four electrode components 140 during actual implementation will not cause the annular housing 111 to break; at the same time, by designing the wall thickness of the annular housing 111 to be less than or equal to 100 mm, the volumetric energy density of the battery device 100 can be maximized.

[0141] To achieve the same capacity, two battery cells 11, which include two electrode assemblies 140 and have four terminals arranged in a straight line along a third direction, are required. This results in two battery cell casings 110 occupying space inside the casing. However, in this embodiment, only one battery cell 11 is required, and only one battery cell casing 110 occupies space inside the casing. Therefore, the volumetric energy density of the battery device 100 in this embodiment is higher.

[0142] According to some embodiments of this application, the first electrode portion 120 includes two adjacent electrode assemblies 140, wherein one first electrode post 150 and one second electrode post 160 are directly opposite the first electrode portion 120. The second electrode portion 130 includes two adjacent electrode assemblies 140, wherein another first electrode post 150 and another second electrode post 160 are directly opposite the second electrode portion 130.

[0143] Exemplarily, the two electrode assemblies 140 of the first electrode portion 120 are stacked and adjacent to each other, and the two electrode assemblies 140 of the second electrode portion 130 are also stacked and adjacent to each other. In some examples, such as Figure 4 and Figure 5 As shown, the first positive electrode post 150a and the first negative electrode post 160a arranged in a row can be disposed in the middle of the second electrode section 130 along the second direction, and the two electrode assemblies 140 of the second electrode section 130 can be opposite to the first positive electrode post 150a and the first negative electrode post 160a; the second positive electrode post 150b and the second negative electrode post 160b arranged in a row can be disposed in the middle of the first electrode section 120 along the second direction, and the two electrode assemblies 140 of the first electrode section 120 can be opposite to the second positive electrode post 150b and the second negative electrode post 160b.

[0144] As can be seen from the preceding text, in the embodiment where the four poles are distributed in a straight line along the third direction, when the battery cell 11 includes four electrode assemblies 140 stacked along the second direction, the two poles and the two electrode assemblies 140 located in the middle are directly opposite each other, while the other two electrode assemblies 140 are not opposite each other. In this case, the other two electrode assemblies 140 located on the outer side can be connected to the corresponding poles through the adapter.

[0145] In this embodiment, each electrode assembly 140 is opposite to two corresponding posts with opposite polarities, so that it can be easily connected to the corresponding posts without the need for connection through an adapter. This results in a shorter current path between the electrode assembly 140 and the corresponding posts, which is beneficial for improving the charging and discharging power.

[0146] According to some embodiments of this application, the first electrode portion 120 and the second electrode portion 130 are arranged sequentially along a second direction, and the first direction is perpendicular to the second direction. The housing 110 may further include an end cap 112, which is disposed at one end of the annular housing 111 along the first direction, and two first electrode posts 150 and two second electrode posts 160 are disposed on the end cap 112. The ratio W of the dimension D1 of the first electrode post 150 in the second direction and the dimension D2 of the second electrode post 160 in the second direction to the dimension W of the end cap 112 in the second direction is greater than or equal to 1:10 and less than or equal to 1:2.

[0147] In this embodiment, D1 / W can be any value among 1:10, 1:9, 1:8, 1:7, 1:6, 1:5, 1:4, 1:3, and 1:2, and D2 / W can be any value among 1:10, 1:9, 1:8, 1:7, 1:6, 1:5, 1:4, 1:3, and 1:2. D1 and D2 can be equal or unequal.

[0148] By ensuring that both D1 / W and D2 / W are greater than 1:10, the dimensions of the first pole piece 150 and the second pole piece 160 in the second direction are not too small, thus facilitating a larger flow area for both pole pieces 150 and 160. By ensuring that both D1 / W and D2 / W are less than 1:2, the first pole piece 150 and the second pole piece 160 do not extend beyond the edge of the end cap 112 along the second direction.

[0149] An embodiment of the third aspect of this application provides an electrical device including the battery device 100 in the above embodiments, the battery device 100 being used to provide electrical energy.

[0150] The electrical equipment includes vehicles (such as vehicles, electric vehicles, ships, spacecraft, etc.), display devices (such as mobile phones, tablets, laptops, etc.), electric toys, power tools, etc. It is understood that the electrical equipment provided in this application, because it uses any of the above-mentioned battery devices 100, has all the beneficial effects of the battery devices 100, which will not be elaborated here.

[0151] An embodiment of the fourth aspect of this application provides an energy storage device, which includes the battery device 100 in the above embodiments, the battery device 100 being used for energy storage.

[0152] Energy storage devices may include, but are not limited to, centralized energy storage devices (e.g., containerized energy storage devices), distributed energy storage devices, mobile energy storage devices, wearable energy storage devices, etc. It is understood that the energy storage device provided in this application, by employing any of the aforementioned battery devices 100, possesses all the beneficial effects of the aforementioned battery devices 100, which will not be elaborated upon here.

[0153] A specific embodiment of this application is described below. It should be understood that this specific embodiment is described for illustrative purposes only and should not be construed as limiting the scope of this application.

[0154] <Example 1>

[0155] The battery device 100 includes a control unit and a plurality of battery cells 11. Each battery cell 11 includes a housing 110, a first electrode assembly 140a and a second electrode assembly 140b housed within the housing 110. The housing 110 includes an annular shell 111 and an end cap 112, the end cap 112 covering one end opening of the annular shell 111 along its own centerline (first direction Z). The wall thickness of the annular shell 111 is greater than or equal to 10 mm and less than or equal to 50 mm.

[0156] The first electrode assembly 140a and the second electrode assembly 140b are stacked along the width direction (second direction X) of the annular housing 111. The positive electrode active material of the positive electrode sheet of the first electrode assembly 140a is lithium iron phosphate, and the positive electrode active material of the positive electrode sheet of the second electrode assembly 140b is lithium nickel cobalt manganese oxide.

[0157] The end cap 112 has four terminals, which are linearly distributed along the length direction (third direction Y) of the annular shell 111. The four terminals are a first positive terminal 150a, a second positive terminal 150b, a first negative terminal 160a, and a second negative terminal 160b. The positive tab of the first electrode assembly 140a is connected to the first positive terminal 150a, and the negative tab is connected to the first negative terminal 160a. The positive tab of the second electrode assembly 140b is connected to the second positive terminal 150b, and the negative tab is connected to the second negative terminal 160b. The ratio of the dimension of each terminal in the second direction to the dimension of the end cap 112 in the second direction is greater than or equal to 1:5 and less than or equal to 4:5.

[0158] The first negative terminal 160a of one battery cell 11 is connected to the first positive terminal 150a and the second positive terminal 150b of another battery cell 11 via a first switch. Similarly, the second negative terminal 160b of one battery cell 11 is connected to the first positive terminal 150a and the second positive terminal 150b of another battery cell 11 via a first switch. The first negative terminal 160a and the second positive terminal 150b of each battery cell 11 are connected via a second switch.

[0159] The control unit can control the opening and closing of the first switch and the second switch to switch the battery cell 11 between a first state and a second state. In the first state, the first electrode assembly 140a and the second electrode assembly 140b are connected in series. In the second state, the first electrode assembly 140a and the second electrode assembly 140b are connected to different external circuits, or one of the first electrode assembly 140a and the second electrode assembly 140b is energized while the other is not.

[0160] <Example 2>

[0161] The difference from Embodiment 1 is that in this embodiment, the battery cell 11 includes two first electrode assemblies 140a and two second electrode assemblies 140b. For example... Figure 4 As shown, two first electrode assemblies 140a constitute a first electrode portion 120, and two second electrode assemblies 140b constitute a second electrode portion 130. The first electrode portion 120 is located on one side of the second electrode portion 130 along the second direction; or, as... Figure 5As shown, the first electrode assembly 140a and the second electrode assembly 140b are alternately arranged along the second direction, and the first electrode portion 120 and the second electrode portion 130 each include a first electrode assembly 140a and a second electrode assembly 140b.

[0162] The four terminals are arranged in two rows and two columns. The first positive terminal 150a and the first negative terminal 160a are spaced apart along a third direction and arranged in a row, with the terminals in this row facing the first electrode portion 120. The second positive terminal 150b and the second negative terminal 160b are spaced apart along a third direction and arranged in another row, with the terminals in this row facing the second electrode portion 130.

[0163] The wall thickness of the annular housing 111 is greater than or equal to 30 mm and less than or equal to 100 mm, and the ratio of the dimension of each pole post in the second direction to the dimension of the end cap 112 in the second direction is greater than or equal to 1:10 and less than or equal to 1:2.

[0164] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This 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, include: Multiple battery cells, each battery cell including a housing, a first electrode portion and a second electrode portion housed within the housing, the housing having two first terminals and two second terminals at one end along a first direction, the polarities of the first terminals and the second terminals being opposite, the first electrode portion being electrically connected to one of the first terminals and one of the second terminals, and the second electrode portion being electrically connected to the other first terminal and the other second terminal; wherein each of the first terminals on one battery cell is connected to each of the second terminals on another battery cell via a first switch, and one of the first terminals and the other second terminal on each battery cell are connected via a second switch; The control unit is capable of controlling the opening and closing of the first switch and the second switch to switch the battery cell between a first state and a second state; in the first state, the first electrode portion and the second electrode portion are connected in series; in the second state, the first electrode portion and the second electrode portion are electrically isolated.

2. The battery device according to claim 1, characterized by Both the first electrode portion and the second electrode portion include at least one electrode assembly, and all electrode assemblies are arranged sequentially along the second direction, wherein the first direction is perpendicular to the second direction; The electrode assembly of the first electrode portion and the electrode assembly of the second electrode portion are partly the first electrode assembly and partly the second electrode assembly; the thermal stability of the first electrode assembly is higher than that of the second electrode assembly.

3. The battery device of claim 2, wherein, The battery cell includes a plurality of first electrode assemblies and a plurality of second electrode assemblies; along the second direction, all the first electrode assemblies are disposed on one side of all the second electrode assemblies.

4. The battery device of claim 2, wherein The battery cell includes a plurality of first electrode assemblies and a plurality of second electrode assemblies; along the second direction, the first electrode assemblies and the second electrode assemblies are alternately arranged.

5. The battery device according to claim 4, characterized in that, Both the first electrode portion and the second electrode portion include at least one first electrode assembly and at least one second electrode assembly.

6. The battery device according to any one of claims 2 to 5, characterized in that, The positive electrode active material of the positive electrode sheet of the first electrode assembly includes one or more of lithium iron phosphate, lithium manganese iron phosphate, lithium cobalt oxide, lithium nickel oxide, and lithium manganese oxide. The positive electrode active material of the positive electrode sheet of the second electrode assembly includes one or more of lithium nickel cobalt manganese oxide and lithium nickel cobalt aluminum oxide.

7. The battery device according to any one of claims 1 to 5, characterized in that, The outer shell has an annular shell, the centerline of which is parallel to the first direction, and the wall thickness of which is greater than or equal to 10 mm and less than or equal to 100 mm.

8. The battery device according to claim 7, characterized in that, The two first poles and the two second poles are arranged in two rows and two columns.

9. The battery device according to claim 8, characterized in that, Both the first electrode section and the second electrode section include two electrode assemblies, and the wall thickness of the annular shell is greater than or equal to 30 mm and less than or equal to 100 mm.

10. The battery device according to claim 9, characterized in that, The first electrode portion includes two adjacent electrode assemblies, wherein one of the first electrode posts and one of the second electrode posts are directly opposite the first electrode portion; The second electrode portion contains two adjacent electrode components, with one first electrode post and one second electrode post facing the second electrode portion.

11. The battery device according to claim 8, characterized in that, The first electrode portion and the second electrode portion are arranged sequentially along the second direction, and the first direction is perpendicular to the second direction; the outer shell also includes an end cap, which is disposed at one end of the annular shell along the first direction, and two first electrode posts and two second electrode posts are disposed on the end cap; The ratio of the dimension of the first pole post in the second direction and the dimension of the second pole post in the second direction to the dimension of the end cap in the second direction is greater than or equal to 1:10 and less than or equal to 1:

2.

12. The battery device according to claim 7, characterized in that, The first electrode portion and the second electrode portion are arranged sequentially along the second direction, and the two first pole posts and the two second pole posts are arranged sequentially and spaced apart along the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

13. The battery device according to claim 12, characterized in that, Both the first electrode portion and the second electrode portion include an electrode assembly, and the wall thickness of the annular housing is greater than or equal to 10 mm and less than or equal to 50 mm.

14. The battery device according to claim 12, characterized in that, The housing also includes an end cap, which is disposed at one end of the annular housing along the first direction, and two first pole posts and two second pole posts are disposed on the end cap; The ratio of the dimension of the first pole post in the second direction and the dimension of the second pole post in the second direction to the dimension of the end cap in the second direction are both greater than or equal to 1:5 and less than or equal to 4:

5.

15. An electrical appliance, characterized in that, The electrical equipment includes a battery device as claimed in any one of claims 1 to 14, the battery device being used to provide electrical energy.

16. An energy storage device, characterized in that, The energy storage device includes a battery device as described in any one of claims 1 to 14, the battery device being used to store electrical energy.

Images