Battery monomer, battery device, energy storage device and power utilization device

Abstract

The utility model discloses a battery monomer, a battery device, an energy storage device and a power utilization device, the battery monomer comprises a shell and an electrode assembly, the shell comprises a plurality of shell walls, and the shell walls enclose to form an accommodating space; the electrode assembly is accommodated in the accommodating space; the shell walls comprise a pair of first shell walls which are oppositely arranged along a first direction and a pair of second shell walls which are oppositely arranged along a second direction, the first direction is perpendicular to the second direction, the second direction is the length direction of the single battery, and at least one first shell wall is sunken towards the side where the electrode assembly is located to form a sunken part; the concave part is arranged at one end of the shell along the second direction; the recessed portion accommodates an electrode terminal. According to the invention, the space occupation of the single battery in the first direction can be reduced, and the space utilization rate and the energy density of the single battery are improved.

Description

TECHNICAL FIELD

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

[0002] New energy batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also increasingly used in the field of energy storage and the like.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the field of energy storage, the batteries can be installed in an energy storage box or directly installed at a user side. In these application scenarios, the electrode terminals of the battery monomers occupy a large space, and there is a problem of low space utilization of the battery monomers. Therefore, how to improve the space utilization of the battery monomers is one of the research topics in the industry. UTILITY MODEL CONTENT

[0004] To solve the above technical problems, the present application provides a battery monomer, a battery device, an energy storage device and a power utilization device.

[0005] The present application is implemented through the following technical solutions.

[0006] A first aspect of the embodiment of the present application provides a battery monomer, which comprises a shell and an electrode assembly. The shell comprises a plurality of shell walls, and the shell walls enclose a containing space. The electrode assembly is contained in the containing space. The shell walls comprise a pair of first shell walls arranged opposite to each other along a first direction and a pair of second shell walls arranged opposite to each other along a second direction. The first direction is perpendicular to the second direction, and the second direction is a length direction of the battery monomer. At least one of the first shell walls is recessed to form a recessed portion towards a side where the electrode assembly is located. The recessed portion is arranged at one end of the shell along the second direction. The recessed portion contains an electrode terminal.

[0007] Since the recessed portion formed by recessing the first shell wall along the first direction contains the electrode terminal, the occupation of the space by the electrode terminal in the first direction is reduced, and the space utilization of the battery monomer is improved. Therefore, the battery device composed of the battery monomer has a higher energy density.

[0008] In addition, since the recessed portion is arranged at one end of the shell along the second direction, when a plurality of battery monomers are arranged and stacked, the overall size is more uniform. The recessed portions of the plurality of battery monomers are all arranged at the end portions of the shells, which can also reduce the distance between the electrode terminals of adjacent battery monomers, facilitating the electrical connection between the battery monomers.

[0009] In some embodiments, the recess is configured to extend through a third direction, the first housing wall includes a first segment, a second segment and a third segment connected in sequence, the third segment is recessed relative to the first segment toward the side where the electrode assembly is located, the second segment and the third segment surround the recess, the electrode terminal is disposed in the third segment, and the first direction, the second direction and the third direction are perpendicular to each other.

[0010] Because the recessed portion is designed to extend through the third direction, it facilitates the stacking of multiple battery cells along this direction, resulting in a more uniform overall size. The recessed portion also facilitates electrical connection between the electrode terminals and external conductive structures. Furthermore, the location of the electrode terminals in the third segment is advantageous for mounting external conductive structures.

[0011] In some embodiments, each of the battery cells has a recess that accommodates two electrode terminals with opposite polarities.

[0012] Since the recess accommodates two electrode terminals with opposite polarities, the distance between the positive and negative electrodes of the battery cell is reduced, the conductive path is shortened, the internal resistance of the electrode assembly is reduced, and the temperature rise of the battery cell during charging and discharging is reduced.

[0013] In some embodiments, recesses are formed at both ends of the housing along the first direction, and the two recesses are disposed at the same end of the housing along the second direction, and each recess accommodates an electrode terminal.

[0014] Since each recess accommodates an electrode terminal, the risk of short circuit between the two electrode terminals of a single battery cell is reduced, thus improving the reliability of the battery cell.

[0015] In some embodiments, the projection of the electrode terminal falls within the projection range of the second segment onto a projection plane perpendicular to the second direction.

[0016] Since the projection of the electrode terminals falls within the projection range of the second segment, when viewed along the second direction, the electrode terminals do not protrude from the outer surface of the casing, do not additionally increase the size of the battery cell in the first direction, do not interfere with the arrangement of external components, and can also improve the energy density of the battery cell.

[0017] In some embodiments, the dimension of the third segment along the second direction is not less than 80 mm and not more than 400 mm.

[0018] Because the length of the third segment is within a suitable range, the size of the recess can accommodate two electrode terminals, and the electrode terminals are less likely to overlap and short-circuit. It can also reduce the space occupied inside the casing, thus balancing the reliability and energy density of the battery cell.

[0019] In some embodiments, the dimension of the third segment along the second direction is not less than 40 mm and not more than 200 mm.

[0020] Because the length of the third segment is within a suitable range, the size of the recess can accommodate an electrode terminal and reduce the space occupied inside the casing, thus balancing the reliability and energy density of the battery cell.

[0021] In some embodiments, the dimension of the battery cell along the first direction is 80 to 130 mm, the dimension along the second direction is 300 to 1300 mm, and the dimension along the third direction is 10 to 35 mm.

[0022] Therefore, by designing the size of the battery cells to satisfy the above relationship, it is beneficial to balance the capacity of the battery cells and the stacking efficiency.

[0023] In some embodiments, the dimension of the second segment along the first direction is not less than 3 mm and not more than 10 mm.

[0024] Because the length of the second section is within a suitable range, the size of the recess can accommodate the electrode terminals and reduce the space occupied inside the casing, thus balancing the reliability and energy density of the battery cell.

[0025] In some embodiments, the electrode terminal protrudes 0.5 to 3 mm beyond the third segment along the first direction.

[0026] Therefore, the size of the electrode terminal protruding from the third segment can be within a suitable range, so that the electrode terminal does not protrude from the recess, thereby reducing the size of the battery cell in the first direction and increasing the energy density of the battery cell.

[0027] A second aspect of this application provides a battery device comprising a plurality of battery cells as described in the first aspect of this application. The plurality of battery cells are arranged in a battery cell group along a third direction. The recessed portions of each battery cell are located on the same side of the battery cell group along a second direction. The first direction, the second direction, and the third direction are perpendicular to each other. A sampling component is provided at the end of the battery cell group along the second direction, and the sampling component is located on the same side as the recessed portion along the second direction. The sampling component is electrically connected to the electrode terminal.

[0028] Since the battery device includes a sampling component, the sampling component can collect information by making an electrical connection with the electrode terminals of the recessed portion. Furthermore, the sampling component is located at the end of the battery cell assembly and does not occupy the space in the first direction within the battery device. This increases the proportion of the electrode component within the unit volume of the battery device, which is beneficial for improving the energy density of the battery device.

[0029] In some embodiments, the sampling assembly includes a sampling plate extending along the third direction, the sampling plate not extending beyond the electrode terminal along the first direction.

[0030] Therefore, the sampling plate is a strip structure extending along a third direction, with the extension direction being the same as the direction of the battery cell stack. This makes it easier for the sampling plate to collect information from each battery cell in the battery cell group, thereby increasing the sampling range of the sampling component. In addition, the sampling plate does not extend beyond the electrode terminals along the first direction, further reducing the space occupied by the sampling component in the first direction inside the battery device, which is beneficial to improving the energy density of the battery device.

[0031] In some embodiments, the sampling plate is parallel to and connected to the second housing wall.

[0032] Since the sampling plate is parallel to and connected to the second housing wall, it helps to make the battery structure more compact, improves the installation stability of the sampling plate, and also improves the space utilization of the battery device.

[0033] In some embodiments, the battery cell group includes adjacent first battery cells and second battery cells; the electrode terminals include first electrode terminals and second electrode terminals with opposite polarities; the electrode terminals are arranged along the third direction; along the third direction, the arrangement order of the first electrode terminals and second electrode terminals in the same column is the same, or the arrangement order of the first electrode terminals and second electrode terminals in the same column is opposite.

[0034] Since the arrangement order of the first electrode terminal and the second electrode terminal in the same column of the battery cell group is the same or opposite, the arrangement of the electrode terminals can adapt to the stacking requirements of various battery cells, and facilitates the electrical connection of adjacent battery cells, which helps to simplify the assembly process of the electrical connection structure.

[0035] In some embodiments, the battery cell group further includes a busbar assembly, the busbar assembly including a first busbar connecting the first electrode terminal of the first battery cell to the second electrode terminal of the second battery cell; the sampling assembly further includes a first sampling terminal connecting the sampling plate to the first busbar.

[0036] Therefore, the first busbar can realize the electrical connection of the electrode terminals on one side of the adjacent battery cell, and the sampling board is connected to the first busbar, thereby improving the accuracy of the sampling component in obtaining battery cell information.

[0037] In some embodiments, the busbar assembly further includes a second busbar, the second busbar connecting the first electrode terminal of the second battery cell to the second electrode terminal of the first battery cell; the sampling assembly further includes a second sampling terminal, the second sampling terminal connecting the sampling board to the second busbar.

[0038] Therefore, the second busbar can be used to achieve electrical connection of the electrode terminals on the other side of the adjacent battery cell. The sampling board is connected to the second busbar, which improves the accuracy of the sampling component in obtaining battery cell information.

[0039] In some embodiments, the second busbar is electrically connected to the housing of the second battery cell, and a protrusion is provided on the housing surface of the recess of the second battery cell, the protrusion protruding away from the electrode assembly, and the second sampling terminal is electrically connected to the protrusion.

[0040] This allows the potential of the casing of the second battery cell to be the same as that of the electrode terminals connected to the second busbar, facilitating the second sampling terminal to obtain the voltage information of the battery cell by acquiring the casing potential. Furthermore, the protrusion facilitates electrical connection between the second sampling terminal and the casing.

[0041] In some embodiments, the second busbar is fixedly connected to the housing via a conductive element.

[0042] This facilitates the electrical connection between the second busbar and the housing, while restricting the movement of the second busbar, reducing the risk of the second sampling terminal failing due to the second busbar leaving the installation position, and improving the reliability and stability of the battery device.

[0043] In some embodiments, the conductive element is an elastic sheet.

[0044] Therefore, the elasticity of the elastic sheet can adapt to the positional changes caused by the expansion of the battery cell, and can also better cope with external vibration and impact, further reducing the risk of the second sampling terminal failing due to the second busbar detaching from the installation position, and improving the reliability and stability of the battery device.

[0045] In some embodiments, along the first direction, the highest point of the busbar component does not exceed the first segment, and the height difference between the highest point of the busbar component and the first segment is not greater than 2 mm.

[0046] Therefore, the busbar assembly can be accommodated in the recess, reducing the risk of interference between the busbar assembly and other structures, and making it less likely to cause positional interference during processing and assembly.

[0047] In some embodiments, the sampling component further includes a connector disposed at one end of the sampling plate along the third direction, the connector being used to output the information collected by the sampling plate.

[0048] Therefore, the sampling component is equipped with a connector, which is used to receive and transmit the electrical signals collected by the sampling board.

[0049] In some embodiments, the battery device further includes a housing that accommodates the battery cell pack; the housing has a clearance groove that extends along the third direction and is configured to accommodate the sampling component.

[0050] Since the clearance slot can accommodate the sampling component, it serves to protect and limit its movement. Furthermore, the clearance slot allows the sampling component to be positioned appropriately within the housing, reducing the space occupied by its extension. This results in a more compact battery structure and improved space utilization within the housing.

[0051] A third aspect of this application provides an energy storage device, including a plurality of battery devices as described in the second aspect of this application, the battery devices being used to store or provide electrical energy.

[0052] Since the energy storage device includes the battery device provided in the second aspect of the embodiments of this application, the space utilization and energy density of the energy storage device can be improved to a certain extent.

[0053] A fourth aspect of this application provides an electrical device, including the battery device described in the second aspect of this application or the energy storage device described in the third aspect of this application, wherein the battery device is used to store or provide electrical energy.

[0054] Since the electrical device includes the battery device provided in the second aspect of the embodiments of this application, the space utilization and energy density of the electrical device can be improved to a certain extent.

[0055] The beneficial effects of the embodiments disclosed herein include: by means of this application, the space occupied by a single battery cell in the first direction can be reduced, thereby improving the space utilization and energy density of the single battery cell. Attached Figure Description

[0056] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0057] Figure 1This application provides structural schematic diagrams of vehicles for some embodiments;

[0058] Figure 2 An exploded perspective view of a battery provided in some embodiments of this application;

[0059] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0060] Figure 4 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0061] Figure 5 This is a schematic diagram of the structure of a battery cell pack provided in some embodiments of this application;

[0062] Figure 6 This is a schematic diagram of a battery cell pack provided in some embodiments of this application;

[0063] Figure 7 This is a schematic diagram illustrating the installation of the sampling components provided in some embodiments of this application;

[0064] Figure 8 This is a schematic diagram of the structure of a second busbar provided in some embodiments of this application;

[0065] Figure 9 This is a schematic diagram of the structure of a battery cell pack provided in some other embodiments of this application;

[0066] Figure 10 Schematic diagram of a battery cell pack provided in other embodiments of this application;

[0067] Figure 11 A schematic diagram illustrating the installation of the sampling components provided in other embodiments of this application;

[0068] Figure 12 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0069] Figure 13 A partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0070] Figure 14 This is a schematic diagram of a battery cell pack provided in some embodiments of this application;

[0071] Figure 15 A schematic diagram illustrating the installation of the sampling component provided in some embodiments of this application;

[0072] Figure 16 A schematic diagram of the installation of a busbar assembly provided in some embodiments of this application;

[0073] Figure 17This is a schematic diagram of the structure of the box base plate provided in some embodiments of this application;

[0074] Figure 18 This is a schematic diagram of the structure of the clearance groove provided in some embodiments of this application;

[0075] Figure 19 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0076] Explanation of reference numerals in the attached figures

[0077] 1. Battery cell; 2. Housing; 3. Electrode assembly; 4. First housing wall; 4A. First section; 4B. Second section; 4C. Third section; 4D. Protrusion; 5. Second housing wall; 6. Recess; 7. Electrode terminal; 8. First electrode terminal; 9. Second electrode terminal; 10. Battery cell assembly; 11. First battery cell; 12. Second battery cell; 20. Sampling assembly; 21. Sampling plate; 22. First sampling terminal; 23. Second sampling terminal; 24. Connector; 30. Busbar assembly; 31. First busbar; 32. Second busbar; 32A. Groove; 32B. Main body; 33. Conductive component; 100. Battery device; 101. Housing; 102. Cover; 103. Base plate; 104. Clearance groove; 200. Controller; 300. Motor; 1000. Vehicle; 2000. Energy storage device; S. Accommodation space. Detailed Implementation

[0078] 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.

[0079] 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.

[0080] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" 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.

[0081] 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.

[0082] 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 are in an "or" relationship.

[0083] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., 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 do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0084] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," 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 communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0085] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0086] The following is a detailed description of this application.

[0087] Currently, new energy batteries are being used more and more widely in daily life and industry. They are not only used in energy storage systems for hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of power batteries, the market demand is also constantly increasing.

[0088] In many applications, the electrode terminals of battery cells occupy a lot of space, reducing the space utilization rate of battery cells. Furthermore, electrode terminals protruding from the casing can interfere with the assembly of other components. Therefore, how to improve the space utilization rate of battery cells is one of the research topics in the industry.

[0089] Through research and design, the casing wall of the battery cell can be recessed inward to form a recessed part, which can accommodate the electrode terminals. This design can reduce the space occupied by the battery terminals and improve the space utilization of the battery cell.

[0090] Based on this design concept, this application designs a battery cell, which includes a housing and an electrode assembly. The housing includes multiple housing walls that enclose a receiving space. The electrode assembly is received in the receiving space. The housing walls include a pair of first housing walls arranged opposite each other along a first direction and a pair of second housing walls arranged opposite each other along a second direction. The first direction is perpendicular to the second direction, and the second direction is the length direction of the battery cell. At least one first housing wall is recessed towards the side where the electrode assembly is located to form a recessed portion. The recessed portion is located at one end of the housing along the second direction. The recessed portion accommodates an electrode terminal.

[0091] Since the recessed portion formed by the first housing wall along the first direction accommodates the electrode terminals, the space occupied by the electrode terminals in the first direction is reduced, and the space utilization rate of the battery cells is improved, so that the battery device composed of battery cells has a higher energy density.

[0092] Furthermore, since the recessed portion is located at one end of the housing along the second direction, the overall size is more uniform when multiple battery cells are stacked. The fact that the recessed portions of multiple battery cells are all located at the end of the housing also reduces the distance between the electrode terminals of adjacent battery cells, facilitating electrical connection between the battery cells.

[0093] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows with reference to the accompanying drawings.

[0094] Figure 1The diagram illustrates the structure of a vehicle 1000 as 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. Figure 1 As shown, a battery device 100 is installed inside the vehicle 1000. 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.

[0095] 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.

[0096] Figure 2 This is an exploded perspective view of the battery device 100 provided in an embodiment of this application. Figure 2 As shown, the battery device 100 includes a base plate 103, a cover 102 and at least one battery cell 1. The cover 102 covers the base plate 103, thereby forming a space to accommodate the battery cell 1.

[0097] In the embodiments of this application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0098] The battery cell 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 the embodiments of this application are not limited to this.

[0099] Although not illustrated, a single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0100] In some embodiments, the electrode assembly has tabs (not shown) that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0101] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0102] In some embodiments, a single battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0103] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0104] In some embodiments, the housing includes a casing and end caps, the casing having an opening and the end caps closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end caps may also have one or more.

[0105] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, it serves to protect the electrode assembly, and a sealing bag is included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0106] In some embodiments, such as Figure 3 As shown, at least one electrode terminal 7 is provided on the outer casing, and the electrode terminal 7 is electrically connected to a tab (not shown). The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0107] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0108] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0109] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0110] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0111] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0112] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0113] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0114] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0115] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0116] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0117] Below, refer to Figures 3 to 19 Some embodiments of this application will be described in detail.

[0118] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 4 Partial cross-sectional view of a battery cell provided in some embodiments of this application; Figure 5 This is a schematic diagram of the structure of a battery cell pack provided in some embodiments of this application; Figure 6 This is a schematic diagram of a battery cell pack provided in some embodiments of this application;

[0119] Figure 7This is a schematic diagram illustrating the installation of the sampling components provided in some embodiments of this application; Figure 8 This is a schematic diagram of the structure of a second busbar provided in some embodiments of this application; Figure 9 This is a schematic diagram of the structure of a battery cell pack provided in some other embodiments of this application; Figure 10 Schematic diagram of a battery cell pack provided in other embodiments of this application; Figure 11 A schematic diagram illustrating the installation of the sampling components provided in other embodiments of this application; Figure 12 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application; Figure 13 A partial cross-sectional view of a battery cell provided in some embodiments of this application; Figure 14 This is a schematic diagram of a battery cell pack provided in some embodiments of this application; Figure 15 A schematic diagram illustrating the installation of the sampling component provided in some embodiments of this application; Figure 16 A schematic diagram of the installation of a busbar assembly provided in some embodiments of this application; Figure 17 This is a schematic diagram of the structure of the box base plate provided in some embodiments of this application; Figure 18 This is a schematic diagram of the structure of the clearance groove provided in some embodiments of this application; Figure 19 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application.

[0120] In some embodiments of this application, for ease of explanation, a first direction, a second direction, and a third direction are defined. These directions intersect each other; here, intersecting includes perpendicularly intersecting each other. For ease of understanding of the embodiments of this application, in... Figures 2 to 18 The illustrated embodiments use an example where the first direction, second direction, and third direction intersect each other perpendicularly. However, those skilled in the art should understand that the embodiments of this application are not limited to the case where these three directions intersect each other perpendicularly. In specific embodiments, the first direction may be the height direction of the battery cell, the second direction may be the length direction of the battery cell, and the third direction may be the thickness direction of the battery cell. Figures 2 to 18 In this context, the X direction (i.e., the second direction), the Y direction (i.e., the third direction), and the Z direction (i.e., the first direction) are defined. Sometimes, the direction pointed to by the arrow Z is called "above", and its opposite direction is called "below".

[0121] A first aspect of this application provides a battery cell 1, which includes a housing 2 and an electrode assembly 3. The housing 2 includes a plurality of housing walls that enclose a receiving space S. The electrode assembly 3 is received in the receiving space S. The housing walls include a pair of first housing walls 4 disposed opposite to each other along a first direction (Z) and a pair of second housing walls 5 disposed opposite to each other along a second direction (X). The first direction (Z) is perpendicular to the second direction (X), and the second direction (X) is the length direction of the battery cell 1. At least one first housing wall 4 is recessed toward the side where the electrode assembly 3 is located to form a recess 6. The recess 6 is disposed at one end of the housing 2 along the second direction (X). The recess 6 receives an electrode terminal 7.

[0122] In the embodiments of this application, the housing 2 is a component used to cooperate with the end cap to form the internal environment of the battery cell 1, wherein the formed internal environment can be used to accommodate the electrode assembly 3, the electrolyte (not shown in the figure), and other components.

[0123] Optionally, the shape of the housing 2 can be determined according to the specific shape and size of the electrode assembly 3. The material of the housing 2 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application does not limit it.

[0124] Optionally, the shell 2 can be of various shapes and sizes. The shape of the shell 2 can be a cylinder, cuboid, polygonal prism or other shapes, such as a hexagonal prism.

[0125] Understandably, the shape of the housing 2 can be determined based on the specific shape of the electrode assembly 3. For example, if the electrode assembly 3 is a cylindrical structure, then a cylindrical housing 2 can be selected; if the electrode assembly 3 is a cuboid structure, then a cuboid housing 2 can be selected.

[0126] Optionally, the housing 2 and the end cap can be separate components. An opening can be provided on the housing 2, and the end cap can be used to close the opening to form a housing space S for the battery cell 1.

[0127] Optionally, the housing 2 may have one or two openings. It is understood that if the housing 2 has one opening, then there may be one end cap; if the housing 2 has two openings, then there may be two end caps. The two end caps respectively cover the two openings.

[0128] For example, the end cap and housing 2 can also be integrated. Alternatively, the end cap and housing 2 can form a common connection surface before other components are inserted into the housing, and the end cap can be closed to the housing 2 when it is necessary to encapsulate the interior of the housing 2.

[0129] For example, such as Figure 3 , Figure 4 , Figure 12 ,Figure 13 As shown, the battery cell 1 includes a housing 2 and an electrode assembly 3. The housing 2 includes multiple housing walls that enclose a receiving space S. The electrode assembly 3 is received within the receiving space S. The housing 2 can generally be rectangular.

[0130] It is understood that the casing wall is the external protective structure of the battery cell 1. Optionally, the casing wall can be formed into the casing 2 by welding, bonding, snap-fitting or other connection methods.

[0131] Alternatively, the multiple shell walls can be an integrally formed structure, which is not limited in this application.

[0132] In a specific embodiment, such as Figure 3 , Figure 4 , Figure 12 , Figure 13 As shown, the housing wall includes a pair of first housing walls 4 arranged opposite each other along a first direction (Z) and a pair of second housing walls 5 arranged opposite each other along a second direction (X). The first direction (Z) is perpendicular to the second direction (X), and the second direction (X) is the length direction of the battery cell 1.

[0133] For ease of description, in this specific embodiment, a pair of housing walls arranged opposite each other along a first direction (Z) are referred to as the first housing wall 4, and a pair of housing walls arranged opposite each other along a second direction (X) are referred to as the second housing wall 5. The first direction (Z) can be the height direction of the battery cell 1, and the second direction (X) can be the length direction of the battery cell 1. The housing 2 can generally be cuboid in shape, and the first housing wall 4 can extend along the second direction (X).

[0134] In an embodiment of this application, at least one first housing wall 4 is recessed to the side where the electrode assembly 3 is located to form a recess 6, the recess 6 being disposed at one end of the housing 2 along the second direction (X); the recess 6 accommodating the electrode terminal 7.

[0135] Since the recessed portion 6 formed by the first housing wall 4 along the first direction (Z) accommodates the electrode terminal 7, the space occupied by the electrode terminal 7 in the first direction (Z) is reduced, and the space utilization rate of the battery cell 1 is improved, so that the battery device 100 composed of the battery cell 1 has a higher energy density.

[0136] Optionally, such as Figure 3 , Figure 4 As shown, one of the first housing walls 4 is recessed towards the side where the electrode assembly 3 is located to form a recess 6. The recess 6 is disposed at one end of the housing 2 along the second direction (X), and the recess 6 accommodates the electrode terminal 7.

[0137] Alternatively, the two first housing walls 4 are recessed towards the side where the electrode assembly 3 is located to form a recess 6. The recess 6 is disposed at one end of the housing 2 along the second direction (X), and the recess 6 accommodates the electrode terminal 7. Optionally, the two recesses 6 can be disposed at the same end of the housing 2 along the second direction (X), or they can be disposed at different ends of the housing 2 along the second direction (X).

[0138] Since the recess 6 is located at one end of the housing 2 along the second direction (X), the overall size is more uniform when multiple battery cells 1 are stacked. The recess 6 of multiple battery cells 1 is also located at the end of the housing 2, which reduces the distance between the electrode terminals 7 of adjacent battery cells 1, facilitating electrical connection between the battery cells 1.

[0139] For example, such as Figure 12 , Figure 13 As shown, the two first housing walls 4 are recessed towards the side where the electrode assembly 3 is located to form recessed portions 6, and the recessed portions 6 are disposed at the same end of the housing 2 along the second direction (X). Optionally, the dimensions of the two recessed portions 6 along the first direction (Z) can be the same or different; alternatively, the dimensions of the two recessed portions 6 along the second direction (X) can be the same or different.

[0140] It is understood that the recess 6 has a certain depth and shape. Optionally, the recess 6 can be a pit-like structure, which can be a regular shape, such as a hemispherical pit, a frustum-shaped pit, a pyramid-shaped pit, a cubic pit, etc., or it can be an irregular shape; alternatively, the recess 6 can also be a groove 32A-like structure, which can be a regular shape or an irregular shape.

[0141] In embodiments of this application, electrode terminal 7 can be electrically connected to electrode assembly 3 to facilitate outputting electrical energy from battery cell 1 or inputting electrical energy into battery cell 1. Optionally, electrode terminal 7 can be electrically connected to tab, either directly or via a current collector. This application does not limit this connection.

[0142] Optionally, the electrode terminal 7 can be made of one metal material or multiple metal materials, including but not limited to copper, aluminum, nickel, zinc, and iron. Alternatively, the electrode terminal 7 can be a single-piece molded component or composed of multiple separately molded parts connected together.

[0143] In the embodiments of this application, the recessed portion 6 is configured to extend through a third direction (Y). The first housing wall 4 includes a first segment 4A, a second segment 4B, and a third segment 4C connected in sequence. The third segment 4C is recessed relative to the first segment 4A toward the side where the electrode assembly 3 is located. The second segment 4B and the third segment 4C form the recessed portion 6. The electrode terminal 7 is disposed in the third segment 4C. The first direction (Z), the second direction (X), and the third direction (Y) are perpendicular to each other.

[0144] Optionally, the first segment 4A, the second segment 4B, and the third segment 4C can be integrally formed, such as by stamping or bending; alternatively, the first segment 4A, the second segment 4B, and the third segment 4C can be separately set.

[0145] Alternatively, in the first housing wall 4, the first segment 4A and the second segment 4B can be integrally formed, while the second segment 4B and the third segment 4C are separately formed; or, the second segment 4B and the third segment 4C can be integrally formed, while the first segment 4A and the second segment 4B are separately formed. When the segments are separately formed, they can be connected by bolts, welding, riveting, snap-fitting, or bonding, etc., and this application does not limit this method.

[0146] Optionally, such as Figure 3 As shown, the first shell wall 4 can extend along the second direction (X), the first segment 4A and the third segment 4C both extend along the second direction (X), the second segment 4B can extend from one end of the first segment 4A along the second direction (X) and connect to the third segment 4C, and the other end of the first segment 4A along the second direction (X) connects to a second shell wall 5.

[0147] In a specific embodiment, such as Figure 3 , Figure 4 As shown, the second segment 4B can extend along the first direction (Z) and connect to one end of the third segment 4C along the second direction (X), and the other end of the third segment 4C along the second direction (X) connects to another second shell wall 5.

[0148] Optionally, the electrode terminal 7 is disposed in the third segment 4C, and the third segment 4C may be provided with an electrode lead-out hole (not shown) through which the power supply terminal 7 passes, and one end of the electrode terminal 7 extends into the interior of the housing through the electrode lead-out hole.

[0149] Optionally, an insulating structure may be provided between the electrode terminal 7 and the third segment 4C to insulate and isolate the electrode terminal 7 from the end cap. For example, an insulating element may be provided between the third segment 4C and the electrode terminal 7. Alternatively, a sealing element may be provided between the electrode terminal 7 and the third segment 4C to achieve a sealed fit between the electrode terminal 7 and the third segment 4C.

[0150] In a specific embodiment, the third direction (Y) can be the thickness direction of the battery cell 1, and the recessed portion 6 extends along the third direction (Y), which is beneficial for stacking the battery cells 1 along the third direction (Y).

[0151] Because the recessed portion 6 is configured to extend through the third direction (Y), it facilitates the stacking of multiple battery cells 1 along the third direction (Y), resulting in a more uniform overall size after stacking. The recessed portion 6 also facilitates the electrical connection between the electrode terminals 7 and external conductive structures. Furthermore, the location of the electrode terminals 7 in the third segment 4C is advantageous for mounting external conductive structures.

[0152] In the embodiments of this application, each battery cell 1 is provided with a recess 6, and the recess 6 accommodates two electrode terminals 7 with opposite polarities.

[0153] Optionally, the two electrode terminals 7 can be arranged along the second direction (X) or along the first direction (Z).

[0154] Two electrode terminals 7 with opposite polarities can be arranged along the second direction (X), as in a specific embodiment, such as... Figure 3 As shown, the negative electrode can be closer to the second segment 4B, and in some other embodiments not shown, the positive electrode can be closer to the second segment 4B.

[0155] For example, such as Figure 3 , Figure 4 As shown, the recess 6 accommodates two electrode terminals 7 with opposite polarities. This reduces the distance between the positive and negative electrodes of the battery cell 1, shortens the conductive path of the internal electrode assembly 3, and lowers the internal resistance of the electrode assembly 3, which helps to reduce the temperature rise of the battery cell 1 during charging and discharging. Furthermore, since the electrode terminals 7 are concentrated in the same recess 6, it is easier to electrically connect multiple battery cells 1.

[0156] In the embodiments of this application, recesses 6 are formed at both ends of the housing 2 along the first direction (Z), and the two recesses 6 are disposed at the same end of the housing 2 along the second direction (X), and each recess 6 accommodates an electrode terminal 7.

[0157] For example, such as Figure 12 , Figure 13 As shown, each recess 6 accommodates an electrode terminal 7.

[0158] Optionally, the dimensions of the two recesses 6 along the second direction (X) can be the same or different, and the dimensions along the first direction (Z) can be the same or different.

[0159] Since each recess 6 accommodates an electrode terminal 7, and the distance between the two electrode terminals 7 is appropriate, the risk of short circuit due to overlap between the two electrode terminals 7 of the battery cell 1 can be reduced, thus improving the reliability of the battery cell 1. Furthermore, compared to the electrode terminals 7 along... Figure 4 The diagonal distribution of the housing 2 shown also shortens the conductive path of the internal electrode assembly 3 to some extent, reducing the internal resistance of the electrode assembly 3.

[0160] In the embodiments of this application, the projection of the electrode terminal 7 is projected onto a projection plane perpendicular to the second direction (X) along the second direction (X), and the projection of the electrode terminal 7 falls within the range of the projection of the second segment 4B.

[0161] It is understood that, in a specific embodiment, the projection of electrode terminal 7 falling within the projection range of the second segment 4B can refer to the first direction (Z), and the length of the projection of electrode terminal 7 does not exceed the length of the projection of the second segment 4B.

[0162] The electrode terminal 7 can share at least part of the space in the first direction (Z) with the second segment 4B, without needing to occupy additional space in the first direction (Z), which helps to reduce the space occupied by the battery cell 1. Thus, when viewed along the second direction (X), the electrode terminal 7 does not protrude from the outer surface of the housing 2, does not increase the size of the battery cell 1 in the first direction (Z), does not interfere with the arrangement of external components, and can also improve the energy density of the battery cell 1.

[0163] In this embodiment of the application, the dimension of the third segment 4C along the second direction (X) is not less than 80mm and not more than 400mm.

[0164] For example, such as Figure 3 As shown, the battery cell 1 has only one recessed part 6, and the length L3 of the third segment 4C along the second direction (X) is not less than 80mm and not more than 400mm.

[0165] For example, such as Figure 4 As shown, L3 can be 80mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, etc. Other values ​​are not listed.

[0166] In a specific embodiment, it can be understood that the length L3 of the third segment 4C along the second direction (X) can also be equal to the difference between the length L of the battery cell 1 and the length L1 of the first segment 4A along the second direction (X).

[0167] Since the length L3 of the third segment 4C along the second direction (X) is within a suitable range, the size of the recess 6 can accommodate two electrode terminals 7, and the electrode terminals 7 are not prone to short circuits. It can also reduce the space occupied inside the housing 2, thus balancing the reliability and energy density of the battery cell 1.

[0168] In the embodiments of this application, the dimension of the third segment 4C along the second direction (X) is not less than 40 mm and not more than 200 mm.

[0169] For example, such as Figure 12 As shown, the battery cell 1 forms two recesses 6, and the length L3 of the third segment 4C along the second direction (X) is not less than 40mm and not more than 200mm.

[0170] For example, such as Figure 13 As shown, L3 can be 40mm, 60mm, 80mm, 100mm, 120mm, 140mm, 160mm, 180mm, 200mm, etc. Other values ​​are not listed.

[0171] Since the length of the third segment 4C is within a suitable range, the size of the recess 6 can accommodate an electrode terminal 7, and can also reduce the space occupied inside the housing 2, thus balancing the reliability and energy density of the battery cell 1.

[0172] In the embodiments of this application, the size of the battery cell 1 along the first direction (Z) is 80 to 130 mm, the size along the second direction (X) is 300 to 1300 mm, and the size along the third direction (Y) is 10 to 35 mm.

[0173] Optionally, such as Figure 3 As shown, the length L of the battery cell 1 can be from 300 to 1300 mm, specifically 300 mm, 400 mm, 500 mm, 600 mm, 700 mm, 800 mm, 900 mm, 1000 mm, 1100 mm, 1200 mm, 1300 mm, etc. Other values ​​are not listed. In a specific embodiment, the length L of the battery cell 1 can refer to the maximum dimension of the battery cell 1 along the second direction (X).

[0174] Optionally, such as Figure 3 As shown, the height H of the battery cell 1 can be from 80 to 130 mm, specifically 80 mm, 90 mm, 100 mm, 110 mm, 120 mm, 130 mm, etc. Other values ​​are not listed. In a specific embodiment, the height H of the battery cell 1 can refer to the maximum dimension of the battery cell 1 along the first direction (Z).

[0175] Optionally, such as Figure 3As shown, the thickness D of the battery cell 1 can be 10 to 35 mm, specifically 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, etc. Other values ​​are not listed.

[0176] Therefore, by designing the size of the battery cell 1 to satisfy the above relationship, it is beneficial to balance the capacity of the battery cell 1 and the stacking efficiency.

[0177] In the embodiments of this application, the dimension of the second segment 4B along the first direction (Z) is not less than 3mm and not more than 10mm.

[0178] For example, the length L2 of the second segment 4B along the first direction (Z) can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. Other values ​​will not be listed.

[0179] In a specific embodiment, such as Figure 4 As shown, the second segment 4B can extend along the first direction (Z), and the length L2 of the second segment 4B can be the depth of the recess 6.

[0180] Since the length of the second segment 4B is within a suitable range, the size of the recess 6 can accommodate the electrode terminal 7, and can also reduce the space occupied inside the housing 2, thus balancing the reliability and energy density of the battery cell 1.

[0181] In the embodiments of this application, the electrode terminal 7 protrudes from the third segment 4C by 0.5 to 3 mm along the first direction (Z). The electrode terminal 7 has a certain height after being led out, which can reduce the risk of short circuit leakage caused by contact between the component electrically connected to the electrode terminal 7 and the housing 2.

[0182] For example, such as Figure 4 , Figure 13 As shown, electrode terminal 7 protrudes from the third segment 4C along the first direction (Z). In this embodiment, the height of the portion protruding from the third segment 4C along the first direction (Z) is referred to as the height of electrode terminal 7. Optionally, the height h1 of electrode terminal 7 can be 0.5 to 3 mm. Specifically, the height h1 can be 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, etc., and other values ​​are not listed.

[0183] Optionally, the height h1 of the two electrode terminals 7 can be the same or different.

[0184] In a specific embodiment, such as Figure 4 , Figure 13 As shown, the height h1 of the two electrode terminals 7 can be the same, which facilitates the installation of other electrical connection structures, such as the busbar assembly 30.

[0185] Therefore, the size of the electrode terminal 7 protruding from the third segment 4C is within a suitable range, so that the electrode terminal 7 does not protrude from the recess 6, thereby reducing the size of the battery cell 1 in the first direction (Z) and increasing the energy density of the battery cell 1.

[0186] The second aspect of this application provides a battery device 100, including a plurality of battery cells 1 of the first aspect of this application. The plurality of battery cells 1 are arranged in a battery cell group 10 along a third direction (Y). The recesses 6 of each battery cell 1 are all located on the same side of the battery cell group 10 along a second direction (X). The first direction (Z), the second direction (X) and the third direction (Y) are perpendicular to each other. A sampling component 20 is provided at the end of the battery cell group 10 along the second direction (X), and the sampling component 20 and the recesses 6 are located on the same side along the second direction (X). The sampling component 20 is electrically connected to the electrode terminal 7.

[0187] Optionally, the individual battery cells 1 in the battery cell pack 10 can be fixed together by means of bonding or other methods.

[0188] Alternatively, the individual battery cells 1 in the battery cell pack 10 can be arranged in close proximity, or structures such as heat insulation components or protective components can be provided between adjacent battery cells 1. This application does not limit this.

[0189] Optionally, the shape of each battery cell 1 in the battery cell pack 10 is not limited; it can be similar to a cuboid or a cylinder.

[0190] Optionally, the shapes of the individual battery cells 1 in the battery cell pack 10 can be the same or different.

[0191] Optionally, the shapes of each battery cell 1 in the battery cell pack 10 can be the same, similar to a cuboid. The dimensions of each battery cell 1 and the dimensions of the recess 6, such as the dimensions along the first direction (Z), the second direction (X), or the third direction (Y), can be the same or different.

[0192] For example, the size of each battery cell 1 in the battery cell group 10 is the same as the size of the recess 6, that is, each battery cell group 10 can select battery cells 1 of the same specifications.

[0193] Optionally, the recesses 6 of each battery cell 1 in the battery cell group 10 may all be located on the same side of each battery cell 1 along the first direction (Z), or the recesses 6 of some battery cells 1 may be located on one side along the first direction (Z), and the recesses 6 of the remaining battery cells 1 may be located on the other side along the first direction (Z).

[0194] In a specific embodiment, the first direction (Z) may be the height direction of the battery cell 1. The recesses 6 of each battery cell 1 in the battery cell group 10 may all be located on the same side of each battery cell 1 along the first direction (Z), may all be located on the side close to the bottom of the battery device 100, or may all be located on the side away from the bottom of the battery device 100.

[0195] Optionally, the battery device 100 may have multiple battery cell groups 10, which can increase the capacity of the battery device 100. The capacity of the battery device 100 refers to the sum of the capacities of the battery cell groups 10 contained in the battery device 100, and the capacity of the battery cell group 10 refers to the sum of the capacities of the multiple battery cells 1 included in the battery cell group 10.

[0196] Optionally, the battery cell group 10 in the battery device 100 can be one or more. Multiple battery cell groups 10 can be electrically connected in series, parallel or mixed connection.

[0197] Optionally, the capacities of the multiple battery cell packs 10 may be the same or different, and this application does not limit this.

[0198] The sampling component 20 is a part that monitors the battery's operating status and can improve the reliability of the battery device 100. The sampling component 20 can collect information such as voltage and temperature of the battery cells 1 in order to detect whether there are any abnormalities in the battery's voltage, temperature, etc.

[0199] It is understood that the sampling terminal can be electrically connected to the electrode terminal 7, and the sampling component 20 can be disposed at one end near the recess 6 along the second direction (X) to shorten the sampling path.

[0200] Since the battery device 100 includes a sampling component 20, the sampling component 20 can collect information by electrically connecting to the electrode terminal 7 of the recess 6. Furthermore, the sampling component 20 is located at the end of the battery cell assembly 10 and does not occupy the space in the first direction (Z) within the battery device 100, thereby increasing the proportion of the electrode assembly 3 within the unit volume of the battery device 100, which is beneficial to improving the energy density of the battery device 100.

[0201] In the embodiments of this application, the sampling component 20 includes a sampling plate 21 extending along a third direction (Y). The sampling plate 21 does not extend beyond the electrode terminal 7 along a first direction (Z). The third direction (Y) can be the thickness direction of the battery cell 1. The third direction (Y) is the same as the stacking direction of the battery cell 1, which facilitates sampling of more battery cells 1.

[0202] Optionally, the sampling plate 21 is a strip structure extending along a third direction (Y), and its specific shape can be flat, sheet-like, or any other arbitrary shape.

[0203] Optionally, the sampling board 21 can be a flexible circuit board or a PCB (Printed Circuit Board). It can transfer, summarize, and / or process the collected electrical information, including but not limited to data such as temperature, voltage, or current.

[0204] Alternatively, the sampling board 21 can be partially or entirely composed of flexible circuit boards. Flexible circuit boards can improve the adaptability of the sampling board 21 in multiple battery cells 1, which is beneficial for the flexible arrangement of the sampling board 21.

[0205] Alternatively, the sampling board 21 can be a composite structure, such as a composite structure of a circuit board and a substrate. The substrate material includes, but is not limited to, flexible materials such as thin film, silicone, rubber, fiber, plastic, and epoxy resin, or rigid materials such as mica, asbestos, ceramics, and glass.

[0206] In a specific embodiment, such as Figure 2 As shown, the number of battery cell groups 10 in the battery device 100 is one, and a sampling component 20 is provided for a single battery cell group 10.

[0207] For example, such as Figure 7 , Figure 11 As shown, the recess 6 of the battery cell 1 is one, and the edge of the sampling plate 21 does not extend beyond the electrode terminal 7 along the first direction (Z).

[0208] For example, such as Figure 15 , Figure 16 As shown, the battery cell 1 has two recesses 6, and the edge of the sampling plate 21 does not extend beyond the electrode terminals 7 on both sides along the first direction (Z).

[0209] In some embodiments of this application, the sampling plate 21 can be placed parallel to the second housing wall 5. In other embodiments, the sampling plate 21 can be positioned at an acute angle to the second housing wall 5. The sampling plate 21 is closer to the battery cell 1, making the structure within the battery device 100 more compact and improving space utilization.

[0210] Therefore, the extension direction of the sampling plate 21 is the same as the stacking direction of the battery cells 1, which makes it easier for the sampling plate 21 to collect information of each battery cell 1 in the battery cell group 10 and improve the sampling range of the sampling component 20. In addition, the sampling plate 21 does not extend beyond the electrode terminal 7 along the first direction (Z), which further reduces the space occupied by the sampling component 20 in the first direction (Z) inside the battery device 100, so that the battery cells 1 can have more space to accommodate electrolyte during design, which is beneficial to improving the capacity and energy density of the battery device 100.

[0211] In this embodiment, the sampling plate 21 is parallel to and connected to the second housing wall 5.

[0212] For example, such as Figure 7 , Figure 11 , Figure 15 As shown, the sampling plate 21 is parallel to the second housing wall 5 and is disposed at one end near the recess 6 along the second direction (X).

[0213] Optionally, the sampling plate 21 can be connected to the second housing wall 5 by means of adhesive bonding or other methods. This fixes the position of the sampling plate 21 and reduces the risk of it detaching from its mounting position. It also helps to reduce the size of the sampling assembly 20 in the second direction (X), improves structural compactness, and increases the space utilization rate inside the battery device 100.

[0214] It is understood that the sampling plate 21 can be connected to the second housing wall 5 by an adhesive with good insulating properties, such as resin. This application does not limit this.

[0215] Since the sampling plate 21 is parallel to and connected to the second housing wall 5, it helps to make the battery structure more compact, improve the installation stability of the sampling plate 21, and also improve the space utilization of the battery device 100.

[0216] In the embodiments of this application, the battery cell group 10 includes adjacent first battery cell 11 and second battery cell 12; the electrode terminals 7 include first electrode terminals 8 and second electrode terminals 9 with opposite polarities; the electrode terminals 7 are arranged along a third direction (Y); along the third direction (Y), the arrangement order of the first electrode terminals 8 and the second electrode terminals 9 in the same column is the same, or the arrangement order of the first electrode terminals 8 and the second electrode terminals 9 in the same column is opposite.

[0217] Optionally, the first battery cells 11 included in the battery pack 10 have the same capacity, and the second battery cells 12 included in the battery pack also have the same capacity. In other words, each first battery cell 11 is the same type of battery cell 1, and each second battery cell 12 is the same type of battery cell 1. Here, "the same type of battery cell 1" means that the various parameters of the battery cell 1, such as chemical system, volume, energy, and energy density, are the same.

[0218] Optionally, the first battery cell 11 can be any one of a lithium-ion rechargeable battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and the second battery cell 12 can be any one of a lithium-ion rechargeable battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery. The first battery cell 11 and the second battery cell 12 can be the same type of battery or different types of batteries.

[0219] Optionally, the positive electrode active material of the above-mentioned lithium-ion secondary battery can be lithium iron phosphate or ternary lithium, that is, lithium iron phosphate battery cell 1 or ternary material battery cell 1.

[0220] For example, the battery cell group 10 may include a variety of battery cells 1 with different capacities. For instance, the capacity of the first battery cell 11 may be different from that of the second battery cell 12.

[0221] As another example, the battery cell group 10 may include a scheme of battery cells 1 with the same capacity. For example, the capacity of the first battery cell 11 may be the same as that of the second battery cell 12.

[0222] Optionally, one of the first electrode terminal 8 and the second electrode terminal 9 is a positive electrode, and the other is a negative electrode.

[0223] For example, the first electrode terminal 8 is the positive electrode and the second electrode terminal 9 is the negative electrode.

[0224] For example, such as Figure 5 , Figure 6 As shown, the first battery cell 11 and the second battery cell 12 are stacked at intervals along the third direction (Y), and the arrangement order of the first electrode terminal 8 and the second electrode terminal 9 in the same column along the third direction (Y) is reversed. This can improve the flexibility of the layout of the battery cell 1 and the electrode terminal 7, for example, the arrangement order can be flexibly selected according to factors such as series and parallel circuit design and the internal space size of the housing 101.

[0225] For example, such as Figure 9 , Figure 10 As shown, the first battery cell 11 and the second battery cell 12 are stacked at intervals along the third direction (Y). Along the third direction (Y), the arrangement order of the first electrode terminal 8 and the second electrode terminal 9 in the same column is the same. This can improve the flexibility of the layout of the battery cell 1 and the electrode terminal 7. For example, the arrangement order can be flexibly selected according to factors such as the series and parallel circuit design and the internal space size of the housing 101.

[0226] Since the arrangement order of the first electrode terminal 8 and the second electrode terminal 9 in the same column of the battery cell group 10 is the same or opposite, the arrangement of the electrode terminals 7 can adapt to the stacking requirements of various battery cells 1, and facilitates the electrical connection of adjacent battery cells 1, which helps to simplify the assembly process of the electrical connection structure.

[0227] In the embodiments of this application, the battery cell group 10 further includes a busbar assembly 30, which includes a first busbar 31 that connects the first electrode terminal 8 of the first battery cell 11 to the second electrode terminal 9 of the second battery cell 12; the sampling assembly 20 further includes a first sampling terminal 22 that connects the sampling board 21 to the first busbar 31.

[0228] In the embodiments of this application, the first busbar 31 can realize the electrical connection between battery cells 1 by connecting the electrode terminals 7 of the battery cells 1, such as parallel connection, series connection, or mixed connection. The first busbar 31 can be fixed to the electrode terminals 7 of the battery cells 1 by welding or other methods.

[0229] Optionally, the first busbar 31 can be made of a metallic material, such as copper or aluminum, or other materials, which are not limited in this application. A metallic material can give the busbar suitable strength while also providing a certain degree of flexibility, allowing it to better adapt to changes in the installation position caused by the expansion of the battery cell 1.

[0230] Optionally, the specific dimensions of the first busbar 31 are set according to the dimensions of the electrode terminals 7 to which it is connected.

[0231] Alternatively, the shape of the first busbar 31 can be set according to the position of the electrode terminal 7 to which it is connected.

[0232] For example, such as Figure 5 , Figure 7 As shown, along the third direction (Y), the arrangement order of the first electrode terminal 8 and the second electrode terminal 9 in the same column is opposite. The shape of the first busbar 31 is roughly plate-shaped or sheet-shaped, connecting the adjacent first electrode terminal 8 and the second electrode terminal 9 in the same column to realize the series connection of adjacent battery cells 1.

[0233] For example, such as Figure 9 , Figure 11 As shown, along the third direction (Y), the arrangement order of the first electrode terminal 8 and the second electrode terminal 9 in the same column is the same. The first busbar 31 connects the first electrode terminal 8 of the first battery cell 11 and the second electrode terminal 9 of the second battery cell 12 in different columns to realize the series connection of adjacent battery cells 1.

[0234] For example, such as Figure 14 , Figure 15 , Figure 16As shown, each recess 6 accommodates an electrode terminal 7. On one side along the first direction (Z), the first electrode terminals 8 and the second electrode terminals 9 in the same column are arranged in opposite order along the third direction (Y). The first busbar 31 is generally plate-shaped or sheet-shaped. The first busbar 31 connects the adjacent first electrode terminals 8 and second electrode terminals 9 in the same column to realize the series connection of adjacent battery cells 1.

[0235] Optionally, the first busbar 31 may have a large current-carrying area and a large connection area, which is beneficial for achieving conductive connection.

[0236] The above embodiments, in conjunction with the accompanying drawings, disclose various electrical connection arrangements for series-connected battery cells 1. It is understood that, although not illustrated, the shape of the first busbar 31 or the arrangement of the electrode terminals 7 can be adjusted according to the circuit design to achieve parallel and mixed connections of the battery cells 1; this will not be elaborated further in the embodiments of this application.

[0237] Optionally, the first busbar 31 can be electrically connected to the sampling board 21 via a connector. For example, as shown... Figure 7 , 11 As shown in Figure 15, one end of the first sampling terminal 22 is connected to the first busbar 31, and the other end is connected to the sampling board 21. The first sampling terminal 22 is used to collect parameters of the first battery cell 11 and / or the second battery cell 12, so as to realize real-time monitoring of the first battery cell 11 and / or the second battery cell 12, thereby improving the stability and reliability of the battery device 100.

[0238] It is understood that the sampling terminals are conductive. For example, the first sampling terminal 22 and the first busbar 31 are made of the same material, which makes it easier to solder the first sampling terminal 22 and the first busbar 31, improving the stability of the connection between the two and the current carrying capacity between them, thereby making the sampling board 21 have high stability in acquiring parameters such as voltage.

[0239] Optionally, the first sampling terminal 22 can be connected and fixed to the first busbar 31 by welding, specifically by reflow soldering, ultrasonic welding, laser welding, friction welding and other processes.

[0240] Optionally, the first sampling terminal 22 can be a temperature sensor, voltage sensor, current detector, etc. The embodiments of this application do not limit the type of sampling terminal.

[0241] For example, the sampling component 20 may be provided with a plurality of first sampling terminals 22, which can simultaneously acquire the status information of a plurality of battery cells 1.

[0242] Therefore, the first busbar 31 can realize the electrical connection of the electrode terminal 7 on one side of the adjacent battery cell 1, and the sampling board 21 is connected to the first busbar 31, thereby improving the accuracy of the sampling component 20 in obtaining information about the battery cell 1.

[0243] In the embodiments of this application, the busbar assembly 30 further includes a second busbar 32, which connects the first electrode terminal 8 of the second battery cell 12 and the second electrode terminal 9 of the first battery cell 11; the sampling assembly 20 further includes a second sampling terminal 23, which connects the sampling board 21 and the second busbar 32.

[0244] In the embodiments of this application, the second busbar 32 can achieve electrical connection between battery cells 1 by connecting the electrode terminals 7 of the battery cells 1, such as in parallel, series, or mixed connections. The second busbar 32 can be fixed to the electrode terminals 7 of the battery cells 1 by welding or other methods.

[0245] Optionally, the second busbar 32 can be made of a metallic material, such as copper or aluminum, or other materials; this application does not limit this. The material of the second busbar 32 can be the same as or different from that of the first busbar 31.

[0246] Optionally, the specific dimensions of the second bus 32 are determined according to the dimensions of the electrode terminals 7 to which it is connected. It may be the same as or different from the first bus 31.

[0247] Alternatively, the shape of the second busbar 32 can be set according to the position of the electrode terminal 7 to which it is connected. It can be the same as or different from the first busbar 31.

[0248] For example, such as Figure 5 , Figure 7 As shown, along the third direction (Y), the arrangement order of the first electrode terminal 8 and the second electrode terminal 9 in the same column is opposite. The shape of the second busbar 32 is roughly plate-shaped or sheet-shaped, connecting the adjacent first electrode terminal 8 and the second electrode terminal 9 in the same column to realize the series connection of adjacent battery cells 1.

[0249] For example, such as Figure 14 , Figure 15 , Figure 16 As shown, each recess 6 accommodates an electrode terminal 7. On the other side along the first direction (Z), that is, the opposite side where the first busbar 31 is arranged, the first electrode terminals 8 and the second electrode terminals 9 in the same column are arranged in opposite order along the third direction (Y). The shape of the second busbar 32 is roughly plate-shaped or sheet-shaped. The second busbar 32 connects the adjacent first electrode terminals 8 and second electrode terminals 9 in the same column to realize the series connection of adjacent battery cells 1.

[0250] Optionally, the second busbar 32 can have a larger current-carrying area and connection area, which is beneficial for achieving conductive connection.

[0251] The above embodiments, in conjunction with the accompanying drawings, disclose various electrical connection arrangements for series-connected battery cells 1. It is understood that, although not illustrated, the parallel and mixed connection of battery cells 1 can be achieved by adjusting the shape of the second busbar 32 or the arrangement order of the electrode terminals 7 according to the circuit design; further details will not be elaborated upon in the embodiments of this application.

[0252] Optionally, the second busbar 32 can be electrically connected to the sampling board 21 via a connector. For example, as shown... Figure 7 , 15 As shown, one end of the second sampling terminal 23 is connected to the second busbar 32, and the other end is connected to the sampling board 21. The second sampling terminal 23 is used to collect parameters of the first battery cell 11 and / or the second battery cell 12, so as to realize real-time monitoring of the first battery cell 11 and / or the second battery cell 12, thereby improving the stability and reliability of the battery device 100.

[0253] It is understood that the sampling terminals are conductive. For example, the second sampling terminal 23 and the second busbar 32 are made of the same material, which makes it easier to solder the second sampling terminal 23 and the second busbar 32, improving the stability of the connection between the two and the current carrying capacity between them, thereby making the sampling board 21 have high stability in acquiring parameters such as voltage.

[0254] Optionally, the second sampling terminal 23 can be connected and fixed to the second busbar 32 by welding, specifically by reflow soldering, ultrasonic welding, laser welding, friction welding and other processes.

[0255] Optionally, the second sampling terminal 23 may be a temperature sensor, voltage sensor, current detector, etc. The type of the second sampling terminal 23 is not limited in this embodiment.

[0256] For example, the sampling component 20 may be provided with multiple second sampling terminals 23, which can simultaneously acquire the status information of multiple battery cells 1.

[0257] Optionally, the shape and structure of the second sampling terminal 23 may be the same as or different from that of the first sampling terminal 22.

[0258] Optionally, in the sampling assembly 20, the number of second sampling terminals 23 may be the same as or different from the number of first sampling terminals 22. The number of the two types of sampling terminals can be determined according to the number of battery cells 1 to be sampled, and this application does not limit this.

[0259] Therefore, the second busbar 32 enables electrical connection of the electrode terminal 7 on the other side of the adjacent battery cell 1, and the sampling board 21 is connected to the second busbar 32, thereby improving the accuracy of the sampling component 20 in obtaining information about the battery cell 1.

[0260] In addition, the busbar assembly 30 is provided with a first busbar 31 and a second busbar 32, and the two busbars are positioned in similar locations and have similar connection methods, which can achieve a uniform and good connection effect.

[0261] Optionally, the bus assembly 30 may also include lead-out terminals, which may be located at one end and / or the other end of the battery cell pack 10 along a third direction (Y) to facilitate electrical connection between the battery cell pack 10 and an external circuit.

[0262] In the embodiments of this application, the second busbar 32 is electrically connected to the housing 2 of the second battery cell 12. A protrusion 4D is provided on the surface of the housing 2 of the recess 6 of the second battery cell 12. The protrusion 4D protrudes in a direction away from the electrode assembly 3. The second sampling terminal 23 is electrically connected to the protrusion 4D.

[0263] Optionally, the convex part 4D can be a hemispherical, cubic, or other shape, and this application does not limit it.

[0264] For example, the protrusion 4D may be formed by a portion of the housing 2 of the third segment 4C protruding away from the side where the electrode assembly 3 is located.

[0265] For example, the second busbar 32 is electrically connected to the housing 2 of the second battery cell 12, and the second sampling terminal 23 is electrically connected to the protrusion 4D of the housing 2. The second sampling terminal 23 is used to collect voltage information. The potential of the housing 2 of the second battery cell 12 and the electrode terminal 7 connected to the second busbar 32 are the same, so that the second sampling terminal 23 can obtain the voltage information of the battery cell 1 by collecting the potential of the housing 2.

[0266] For example, the first electrode terminal 8 of the second battery cell 12 can be a positive electrode, the casing 2 of the second battery cell 12 can be an aluminum casing, and the voltage between the casing 2 and the positive electrode of the second battery cell 12 is close to 0V, which reduces the risk of electrochemical corrosion caused by excessive potential difference between the casing 2 and the positive electrode.

[0267] In a specific embodiment, the protrusion 4D can be at the same height as the first bus 31 in the first direction (Z). The protrusion 4D can facilitate the second sampling terminal 23 to contact the housing 2 for electrical connection, and can also facilitate the processing and installation positioning of the first sampling terminal 22 and the second sampling terminal 23.

[0268] In the embodiments of this application, the second busbar 32 is fixedly connected to the housing 2 via a conductive element 33.

[0269] For example, such as Figure 8 As shown, the second busbar 32 includes two main body portions 32B and a groove 32A. The main body portions 32B can be electrically connected to the electrode terminals 7 of two adjacent battery cells 1 respectively. The groove 32A is connected between the two main body portions 32B, and the groove 32A is at least partially recessed relative to the main body portion 32B toward the battery cell 1, that is, the distance between the groove 32A and the battery cell 1 is less than the distance between the main body portion 32B and the battery cell 1.

[0270] By recessing the groove 32A relative to the main body 32B, the deformation of the second busbar 32 during the charging and discharging of the battery cell 1 can be reduced. This also helps to reduce the height of the busbar assembly 30 along the first direction (Z), thereby increasing the energy density of the battery device 100.

[0271] Therefore, the conductive component 33 can be a metal component or a conductive polymer component to achieve electrical connection between the second busbar 32 and the housing 2.

[0272] This facilitates the electrical connection between the second busbar 32 and the housing 2, while restricting the movement of the second busbar 32, reducing the risk of the second sampling terminal 23 failing due to the second busbar 32 leaving the installation position, and improving the reliability and stability of the battery device 100.

[0273] In the embodiments of this application, the conductive element 33 is an elastic sheet.

[0274] It is understandable that the elastic sheet can be a sheet-like structure with certain elasticity and conductivity, and the material can be the same as the second busbar 32, which is convenient to process by welding or other methods.

[0275] Therefore, the elastic sheet can adapt to the positional changes caused by the expansion of the battery cell 1, and can also better cope with external vibration and impact, further reducing the risk of the second busbar 32 falling out of the installation position and causing the second sampling terminal 23 to fail, thus improving the reliability and stability of the battery device 100.

[0276] In the embodiments of this application, along the first direction (Z), the highest point of the busbar assembly 30 does not exceed the first segment 4A, and the height difference between the highest point of the busbar assembly 30 and the first segment 4A is not higher than 2mm.

[0277] For example, such as Figure 16 As shown, the height difference h2 between the highest point of the busbar assembly 30 and the first segment 4A is no higher than 2mm. The height difference h2 can be 0.5mm, 1.0mm, 1.5mm, 2.0mm, etc. Other values ​​are not listed.

[0278] The height difference h2 is within a suitable range, which is conducive to the reasonable layout of the busbar assembly 30, reduces the occupation of the space of the battery cell 1 and the space in the first direction (Z), and the battery cell 1 has more space in the first direction (Z), which is conducive to accommodating more electrolyte and improving energy density.

[0279] Therefore, the busbar assembly 30 can be accommodated in the recess 6, reducing the risk of interference between the busbar assembly 30 and other structures, and making it less likely to cause positional interference during processing and assembly.

[0280] In embodiments of this application, the sampling component 20 further includes a connector 24 disposed at one end of the sampling plate 21 along a third direction (Y), the connector 24 being used to output the information collected by the sampling plate 21.

[0281] For example, such as Figure 7 , Figure 11 , Figure 15 As shown, a connector 24 may be disposed at one end of the sampling board 21 along a third direction (Y). The connector 24 is electrically connected to the sampling board 21 and is used to receive signals transmitted by the battery cell 1 via the connection assembly. Exemplarily, the connector 24 may include a high-voltage interlock connector 24.

[0282] Connector 24 is electrically connected to sampling board 21 to acquire and transmit information such as voltage, current, or temperature of each battery cell 1 collected by sampling board 21, and to transmit the electrical signals collected by sampling board 21 to an external control or management system. Optionally, connector 24 can also be electrically connected to an external circuit to transmit the information collected by sampling board 21 to the external circuit.

[0283] Therefore, the sampling component 20 is provided with a connector 24, which is used to receive and transmit the electrical signals collected by the sampling board 21.

[0284] In an embodiment of this application, the battery device 100 further includes a housing 101, which houses the battery cell pack 10; the housing 101 has a clearance groove 104 that extends along a third direction (Y) and is configured to accommodate the sampling component 20.

[0285] The housing 101 may include a first housing and a second housing. The first housing and the second housing are fastened together to form a closed space inside the housing 101 to house individual battery cells. Here, "closed" refers to covering or shutting down, which can be either sealed or unsealed. The first housing may be a cover 102 or a base plate 103.

[0286] For example, such as Figure 2 As shown, the first housing is a cover 102, and the second housing is a base plate 103. The cover 102 covers the base plate 103, thereby forming a space to accommodate the battery cell assembly 10.

[0287] In a specific embodiment, such as Figure 17 , Figure 18 As shown, the base plate 103 has a clearance groove 104 extending along a third direction (Y). The clearance groove 104 can accommodate the sampling component 20, including but not limited to the sampling plate 21, the first sampling terminal 22, and the second sampling terminal 23. The base plate 103 and the sampling component 20 share a portion of the space, making the battery device 100 structure more compact.

[0288] The embodiments of this application do not limit the shape and size of the clearance groove 104, and can be designed according to factors such as the shape and size of the sampling component 20.

[0289] Since the clearance groove 104 can accommodate the sampling component 20, it protects and limits the sampling component 20. Additionally, the clearance groove 104 allows the sampling component 20 to be placed in a suitable position within the housing 101, reducing the space occupied by the extended sampling component 20. This design makes the battery device 100 more compact and improves the space utilization of the housing 101.

[0290] A third aspect of this application provides an energy storage device 2000, including a plurality of battery devices 100 as described in the second aspect of this application, the battery devices 100 being used to store or provide electrical energy.

[0291] For example, such as Figure 19 As shown, the energy storage device 2000 includes multiple battery devices 100.

[0292] Since the energy storage device 2000 includes the battery device 100 provided in the second aspect of the embodiments of this application, the space utilization and energy density of the energy storage device 2000 can be improved to a certain extent.

[0293] A fourth aspect of this application provides an electrical device, including the battery device 100 described in the second aspect of this application or the energy storage device 2000 described in the third aspect of this application, wherein the battery device 100 is used to store or provide electrical energy.

[0294] For example, such as Figure 1 As shown, the electrical device can be a vehicle 1000. 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. The vehicle 1000 has a battery device 100 installed inside, which can be used to power the vehicle 1000.

[0295] Since the electrical device includes the battery device 100 provided in the second aspect of the present application, the space utilization and energy density of the electrical device can be improved to a certain extent.

[0296] The present application will be further described below through specific embodiments.

[0297] This application discloses a battery cell 1, which is approximately cuboid and consists of three dimensions: length, thickness, and height. The length L can be 300 to 1300 mm, the thickness D can be 10 to 35 mm, and the height H can be 80 to 130 mm. A recess 6 is designed at one end of the battery cell 1 along a first direction (Z), which can accommodate electrode terminals 7 and a current collector assembly 30. The current collector assembly 30 arranged in the recess 6 does not exceed the height H of the battery cell 1, and the difference between the highest point of the current collector assembly 30 and the highest point of the battery cell 1 does not exceed 2 mm, which is beneficial for making full use of space.

[0298] The recess 6 extends through the third direction (Y). The length L2 of the second segment 4B in the recess 6 is between 3mm and 10mm. This size can accommodate components such as the busbar assembly 30, meeting the electrical connection and sampling requirements of the battery cell 1. The recess 6 occupies less space, which is equivalent to increasing the electrolyte capacity and space utilization of the battery cell 1, and improving the energy density of the battery cell 1 and the battery device 100.

[0299] For the recess 6 that accommodates two electrode terminals 7, the length L3 of its third segment 4C is between 80 mm and 400 mm; for the recess 6 that accommodates one electrode terminal 7, the length L3 of its third segment 4C is between 40 mm and 200 mm. Additionally, the height h1 of the electrode terminal 7 can be between 0.5 and 3 mm.

[0300] In addition, the battery cells 1 can form a battery cell group 10. In the embodiments of this application, the battery cell group 10 includes a plurality of battery cells 1 arranged along a third direction (Y), and there are two arrangement methods.

[0301] The first type is where the first electrode terminal 8 and the second electrode terminal 9, with opposite polarities, are arranged along the third direction (Y); along the third direction (Y), the arrangement order of the first electrode terminal 8 and the second electrode terminal 9 in the same column is the same.

[0302] The second type is where the first electrode terminal 8 and the second electrode terminal 9 with opposite polarities are arranged along the third direction (Y); along the third direction (Y), the arrangement order of the first electrode terminal 8 and the second electrode terminal 9 in the same column is opposite.

[0303] This application also discloses a battery device 100, including a battery cell group 10, a busbar assembly 30 connected to the battery cell group 10, and a sampling assembly 20 disposed at one end of the battery cell group 10 along a second direction (X).

[0304] For example, the sampling plate 21 in the sampling assembly 20 may be parallel to the second housing wall 5.

[0305] For example, the third segment 4C of the recessed portion 6 is designed with a protrusion 4D, which facilitates connection with the second sampling terminal 23 and the sampling board 21 for signal acquisition.

[0306] For example, the second busbar 32 is designed with a conductive elastic sheet that can be welded to the housing 2 to transmit the voltage on the second busbar 32 to the housing 2, so that the above-mentioned protrusion 4D structure carries the voltage signal of the second busbar 32.

[0307] Therefore, the sampling component 20 does not occupy the space in the first direction (Z) inside the battery device 100, and the space occupation in the second direction (X) is also minimized, improving the space utilization rate, and the energy density of the battery device 100 can be increased by more than 2%.

[0308] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0309] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0310] The above embodiments are merely illustrative of the technical solutions of this application and are not intended to limit it. 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 cell, characterized by, The battery cell comprises a shell and an electrode assembly, the shell comprises a plurality of shell walls, and the shell walls enclose a containing space; the electrode assembly is contained in the containing space; The shell wall comprises a pair of first shell walls arranged opposite to each other along a first direction and a pair of second shell walls arranged opposite to each other along a second direction, the first direction is perpendicular to the second direction, and the second direction is a length direction of the battery cell, At least one of the first shell walls is recessed to form a recess on a side where the electrode assembly is located, and the recess is arranged at one end of the shell along the second direction; The recess contains an electrode terminal.

2. The battery cell of claim 1, wherein, The recess is configured to be through along a third direction, the first shell wall comprises a first section, a second section and a third section connected in sequence, the third section is recessed to the side where the electrode assembly is located relative to the first section, and the second section and the third section enclose the recess; the electrode terminal is arranged on the third section; the first direction, the second direction and the third direction are perpendicular to each other.

3. The battery cell of claim 2, wherein, Each of the battery cells is provided with one of the recesses, and the recess contains two electrode terminals with opposite polarities.

4. The battery cell of claim 2, wherein, The shell is provided with recesses at both ends along the first direction, and the two recesses are arranged at the same end of the shell along the second direction, and each of the recesses contains an electrode terminal.

5. The battery cell according to any one of claims 2 to 4, characterized in that, When projected along the second direction on a projection plane perpendicular to the second direction, the projection of the electrode terminal falls within the projection range of the second section.

6. The battery cell of claim 3, wherein, The size of the third section along the second direction is not less than 80 mm and not more than 400 mm.

7. The battery cell of claim 4, wherein, The size of the third section along the second direction is not less than 40 mm and not more than 200 mm.

8. The battery cell according to any one of claims 2 to 7, characterized in that, The size of the battery cell along the first direction is 80-130 mm, the size of the battery cell along the second direction is 300-1300 mm, and the size of the battery cell along the third direction is 10-35 mm.

9. The battery cell of claim 2, wherein, The size of the second section along the first direction is not less than 3 mm and not more than 10 mm.

10. The battery cell of claim 9, wherein, The electrode terminal protrudes from the third section by 0.5-3 mm along the first direction.

11. A battery device characterized by comprising: A plurality of battery cells according to any one of claims 1-10 are arranged into a battery cell group along a third direction, the recesses of the battery cells are located on the same side of the battery cell group along the second direction; the first direction, the second direction and the third direction are perpendicular to each other; A sampling assembly is arranged at the end of the battery cell group along the second direction, and the sampling assembly and the recess are located on the same side along the second direction, and the sampling assembly is electrically connected with the electrode terminal.

12. The battery device of claim 11, wherein, The sampling assembly comprises a sampling plate extending along the third direction, and the sampling plate does not exceed the electrode terminal along the first direction.

13. The battery device of claim 12, wherein, The sampling plate is parallel to and connected with the second shell wall.

14. The battery device of claim 12, wherein, The battery cell group comprises adjacent first and second battery cells; The electrode terminals include first electrode terminals and second electrode terminals with opposite polarities; the electrode terminals are arranged along the third direction; along the third direction, the arrangement sequence of the first electrode terminals and the second electrode terminals in the same column is the same, or the arrangement sequence of the first electrode terminals and the second electrode terminals in the same column is opposite.

15. The battery device of claim 14, wherein, The battery device further includes a bus assembly, the bus assembly includes a first bus member, the first bus member connects the first electrode terminal of the first battery cell and the second electrode terminal of the second battery cell; The sampling assembly further includes a first sampling terminal, the first sampling terminal connects the sampling plate and the first bus member.

16. The battery device of claim 15, wherein, The bus assembly further includes a second bus member, the second bus member connects the first electrode terminal of the second battery cell and the second electrode terminal of the first battery cell; The sampling assembly further includes a second sampling terminal, the second sampling terminal connects the sampling plate and the second bus member.

17. The battery device of claim 16, wherein, The second bus member is electrically connected with the shell of the second battery cell, a protrusion is arranged on the shell surface of the recess of the second battery cell, the protrusion protrudes away from the electrode assembly, and the second sampling terminal is electrically connected with the protrusion.

18. The battery device of claim 16, wherein, The second bus member is fixedly connected with the shell through a conductive member.

19. The battery device of claim 18, wherein, The conductive member is an elastic sheet.

20. The battery device of claim 15 or 16, wherein, Along the first direction, the highest point of the bus assembly does not exceed the first section, and the height difference between the highest point of the bus assembly and the first section is not higher than 2 mm.

21. The battery device of claim 12 or 13, wherein, The sampling assembly further includes a connector arranged at one end of the sampling plate along the third direction, and the connector is used to output information collected by the sampling plate.

22. The battery device of any one of claims 11-13, wherein, The battery device further includes a box body, and the box body accommodates the battery cell group; The box body is provided with a avoiding groove, the avoiding groove extends along the third direction, and the avoiding groove is configured to accommodate the sampling assembly.

23. An energy storage device, comprising: The battery device includes a plurality of battery devices according to any one of claims 11 to 22, and the battery devices are used to store or provide electric energy.

24. An electrical device, comprising: The battery device includes the battery device according to any one of claims 11 to 22 or the energy storage device according to claim 23, and the battery cell or the battery device is used to store or provide electric energy.

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