Battery cell, battery device, and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly and an adapter plate. The shell comprises a wall part, and a liquid injection hole is formed in the wall part; the electrode terminal is arranged on the wall part; the electrode assembly is arranged in the shell and comprises a tab; the switching piece is arranged in the shell and comprises a tab connecting part and a terminal connecting part which are connected with each other, the tab connecting part is connected with the tab, the terminal connecting part is connected with the electrode terminal, the tab connecting part is provided with a first hollow area, and the first hollow area is arranged opposite to the liquid injection hole in the thickness direction of the wall part. The cycle performance of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] With the development of new energy technologies, battery cells are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] As batteries are used in a wider range of applications, the requirements for the cycle performance of individual battery cells are becoming increasingly stringent. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device that can improve the cycle performance of the battery cell.

[0005] In a first aspect, this application provides a battery cell, including a housing, electrode terminals, an electrode assembly, and an adapter plate. The housing includes a wall portion with a liquid injection hole. The electrode terminals are disposed in the wall portion. The electrode assembly is disposed inside the housing and includes tabs. The adapter plate is disposed inside the housing and includes a tab connection portion and a terminal connection portion connected to each other. The tab connection portion is connected to the tabs, and the terminal connection portion is connected to the electrode terminals. The tab connection portion has a first hollow area, which is disposed opposite to the liquid injection hole in the thickness direction of the wall portion.

[0006] When the volume of the battery cell is small, a first hollow area is set in the tab connection part of the adapter to avoid the liquid injection hole. The flexible setting of the liquid injection hole position makes the overall arrangement of the battery cell more reasonable. With the size of the adapter of the battery cell maximized, the cycle performance of the battery cell is improved, the current carrying capacity of the adapter is increased, and the space utilization of the adapter is higher.

[0007] In some alternative embodiments, the first cutout area is located on the periphery of the tab connection portion. This ensures the continuity of the adapter piece, makes the size of the first cutout area smaller, and guarantees the current carrying capacity of the adapter piece.

[0008] In some optional embodiments, the battery cell further includes a pressure relief mechanism disposed on the wall portion, and a first hollow area is disposed on the side of the electrode connection portion opposite to the pressure relief mechanism along the length direction of the wall portion. This better utilizes the effective space of the wall portion, improves the space utilization rate of the adapter piece, and enhances the current carrying capacity of the adapter piece.

[0009] In some optional embodiments, the adapter piece further includes a second hollow area. Along the width direction of the wall portion, the first hollow area and the second hollow area are respectively disposed on both sides of the terminal connection portion; along the length direction of the wall portion, the first hollow area extends beyond the second hollow area. By providing the second hollow area, the coverage area of ​​the adapter piece is reduced, saving materials and lowering costs.

[0010] In some optional embodiments, the electrode connecting portion includes a first connecting portion, a second connecting portion, and a third connecting portion arranged along the width direction of the wall portion. The terminal connecting portion is connected to the second connecting portion, the first connecting portion is connected to the electrode tab, and the third connecting portion is connected to the electrode tab. The second connecting portion has a first edge and a second edge arranged opposite to each other along the length direction of the wall portion. In the direction from the first edge to the second edge, both the first connecting portion and the third connecting portion protrude from the second edge. In the direction from the second edge to the first edge, the first hollow area is located on one side of the first connecting portion.

[0011] By having both the first and third connecting parts protrude from the second edge, the connection between the first and third connecting parts is reduced. When the first and third connecting parts are connected to the electrode tabs respectively, the stress distribution of the adapter plate is changed, the stress concentration problem is alleviated, and the connection strength and durability of the adapter plate are improved.

[0012] In some alternative embodiments, the adapter piece further includes a thickened portion, at least partially disposed on the side of the first connection portion opposite to the electrode assembly, and connected to the first connection portion. By connecting the thickened portion to the first connection portion, the risk of current bottleneck caused by the first hollow area is reduced, and the current-carrying capacity of the first connection portion is improved.

[0013] In some alternative embodiments, a portion of the thickened portion is disposed on the side of the second connection portion opposite to the electrode assembly and connected to the second connection portion. This improves the current-carrying capacity between the terminal connection portion and the first connection portion.

[0014] In some alternative embodiments, the adapter piece is integrally molded. This improves the connection strength of the adapter piece and reduces the impact of excessive connection points on its current-carrying capacity.

[0015] In some alternative embodiments, the orthographic projection of the first connecting portion onto the thickened portion is placed within the thickened portion. The entire first connecting portion is thickened, improving current carrying capacity and reducing the difficulty of thickening the adapter plate.

[0016] In some alternative embodiments, the thickness of the thickened portion ranges from 1 mm to 2.5 mm. This ensures that the thickness of the thickened portion meets the current-carrying requirements.

[0017] In some alternative embodiments, the first connecting portion extends beyond the third connecting portion in the direction from the first edge to the second edge. By extending the length of the first connecting portion, the flow capacity of the first connecting portion is improved.

[0018] In some alternative embodiments, along the width direction of the wall portion, the first connecting portion has a third edge away from the second connecting portion, and the third connecting portion has a fourth edge away from the second connecting portion; in the width direction of the wall portion, the distance between the terminal connecting portion and the third edge is smaller than the distance between the terminal connecting portion and the fourth edge. By making the terminal connecting portion closer to the third edge relative to the fourth edge, the current-carrying capacity between the terminal connecting portion and the first connecting portion and the third connecting portion is made closer.

[0019] In some alternative embodiments, a portion of the terminal connection is connected to the second connection and a portion is connected to the first connection. By partially positioning the terminal connection in the first connection, the current-carrying capacity of the terminal connection and the first connection is improved.

[0020] In some alternative embodiments, multiple electrode assemblies are provided, including a first electrode assembly and a second electrode assembly. A first connecting portion is connected to the first electrode assembly, and a third connecting portion is connected to the second electrode assembly. The adapter plate can be connected to multiple electrode assemblies respectively to meet the needs of a single battery cell with multiple electrode assemblies.

[0021] In some alternative embodiments, the terminal connection portion protrudes from the surface of the tab connection portion facing the wall portion; the wall portion includes an electrode lead-out hole, the electrode terminal covers the electrode lead-out hole, and at least a portion of the terminal connection portion is received in the electrode lead-out hole and connected to the electrode terminal. The protrusion of the terminal connection portion from the tab connection portion facilitates a secure connection with the electrode terminal.

[0022] Secondly, embodiments of this application also provide a battery device, including the battery cell described in the first aspect.

[0023] Thirdly, embodiments of this application also provide an electrical device configured to receive electrical energy provided by the battery device described in the second aspect. Attached Figure Description

[0024] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0025] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0026] Figure 2 Schematic diagram of a battery device provided for some embodiments of this application;

[0027] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application;

[0028] Figure 4 for Figure 3 The diagram shows the structural connection between the end cap and the adapter plate.

[0029] Figure 5 for Figure 4 A cross-sectional view along the AA direction;

[0030] Figure 6 for Figure 3 A schematic diagram of one possible structure of the adapter plate is shown;

[0031] Figure 7 for Figure 3 Another structural schematic diagram of the adapter plate shown;

[0032] Figure 8 for Figure 3 Another structural schematic diagram of the adapter plate shown;

[0033] Figure 9 for Figure 3 Another structural schematic diagram of the adapter plate shown;

[0034] Figure 10 for Figure 3 Another structural schematic diagram of the adapter plate shown;

[0035] Figure 11 for Figure 10 The front view of the adapter plate is shown;

[0036] Figure 12 for Figure 3 The diagram shows another possible structure of the adapter plate.

[0037] The accompanying drawings are not necessarily drawn to scale.

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

[0039] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing; 5b. Second housing; 6. Individual battery cell;

[0040] 10. Electrode assembly; 11. Electrode tab; 20. Housing; 20a. Wall; 21. Housing; 22. End cap; 30. Electrode terminal; 40. Adapter piece; 50. Liquid injection port; 60. Pressure relief mechanism; 70. Electrode lead-out port;

[0041] 41. Electrode connection portion; 42. Terminal connection portion; 43. First hollow area; 44. Second hollow area; 401. First connection portion; 402. Second connection portion; 403. Third connection portion; 404. First edge; 405. Second edge; 406. Third edge; 408. Fourth edge; 410. Thickened portion; X, Second direction; Y, Third direction; Z, First direction. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0048] In this application, "multiple" means two or more (including two).

[0049] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0050] A battery device typically refers to a single physical module comprising multiple battery cells to provide higher voltage and capacity. A battery cell can be the smallest unit that makes up a battery device.

[0051] For battery devices requiring rapid charging and discharging, a higher voltage is necessary. When assembling individual battery cells into a battery device, more cells need to be placed within the limited volume of the device; therefore, the individual cell size must be reduced. During rapid charging and discharging, to reduce the temperature rise caused by large overcurrents, the adapter plate needs to be of sufficient size to meet the cycle performance requirements of the individual cells; however, a large adapter plate can obstruct the electrolyte filling port.

[0052] In view of this, this application provides a battery cell that improves the cycle performance and enhances the overcurrent capacity by setting a first hollow area on the adapter piece to change the position of the liquid injection hole, so that the liquid injection hole is positioned opposite to the first hollow area.

[0053] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0054] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0055] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0056] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0057] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0058] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0059] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0060] Figure 2 A schematic diagram of a battery device provided for some embodiments of this application.

[0061] Reference Figure 2 In some embodiments, the battery device 2 may include one or more battery cell assemblies for providing voltage and capacity.

[0062] A battery cell assembly may include multiple battery cells 6, which are connected in series, parallel, or mixed connection via a busbar. Mixed connection means that multiple battery cells 6 are connected in both series and parallel.

[0063] The battery cell 6 can be a secondary battery cell, which refers to the battery cell 6 that can be recharged to activate the active materials and continue to be used after the battery cell 6 has been discharged.

[0064] As an example, the battery cell 6 can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0065] As an example, the battery cell 6 can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include square battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0066] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 6; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 6 into a single module. As an example, a battery module can be formed by bundling multiple battery cells 6 together with cable ties.

[0067] In some embodiments, the battery device 2 may be a battery pack, which includes a housing 5 and one or more battery cell assemblies housed within the housing 5. As an example, the battery cell assembly may be a battery module, which can be housed within the housing 5 by fixing the battery module to the housing 5. Alternatively, as an example, the battery cell assembly may be housed within the housing 5 by directly fixing multiple battery cells 6 to the housing 5.

[0068] In some embodiments, the housing 5 is used to house the battery cell 6, and the housing 5 can have various structures.

[0069] In some embodiments, the housing 5 may include a first housing 5a and a second housing 5b. The first housing 5a and the second housing 5b are fastened together to form a closed space inside the housing 5 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 5a may be a top cover or a bottom plate.

[0070] In some embodiments, the housing 5 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 5 forms an enclosed space to accommodate the battery cell assembly. As an example, the frame may include multiple side beams.

[0071] In some embodiments, the housing 5 may be part of the chassis structure of the vehicle 1. For example, a portion of the housing 5 may be at least a portion of the floor of the vehicle 1, or a portion of the housing 5 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1.

[0072] In some embodiments, the battery device 2 may be an energy storage device.

[0073] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0074] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0075] Figure 3 This is an exploded structural diagram of a battery cell provided in some embodiments of this application.

[0076] like Figure 3 As shown, in some embodiments, the battery cell 6 includes a housing 20 and an electrode assembly 10 housed within the housing 20.

[0077] In some embodiments, the outer casing 20 may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), or a composite metal casing (such as a copper-aluminum composite casing), etc.

[0078] In some embodiments, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having an opening, and the end cap 22 being connected to the housing 21 and covering the opening.

[0079] The housing 21 is a component used to fit the end cap 22 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte, and other components.

[0080] The housing 21 and the end cap 22 can be separate components. For example, an opening can be provided on the housing 21, and the end cap 22 can be used to close the opening to form an internal cavity for the battery cell 6.

[0081] The housing 21 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 10.

[0082] The shell 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0083] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21. Optionally, the end cap 22 can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.), so that the end cap 22 is not easily deformed when subjected to compression and impact, so that the battery cell 6 can have higher structural strength and improve reliability.

[0084] The end cap 22 is connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0085] The housing 21 may be open at one end or open at both ends. In some examples, the housing 21 may be a structure with an opening on one side, and one end cap 22 is provided to cover the housing 21. In other examples, the housing 21 may also be a structure with openings on both sides, and two end caps 22 are provided, with the two end caps 22 respectively covering the two openings of the housing 21.

[0086] Electrode assembly 10 is a component in the battery cell 6 where electrochemical reactions occur. The housing 21 may contain one or more electrode assemblies 10.

[0087] The electrode assembly 10 includes a first electrode, a second electrode, and a separator. The first electrode and the second electrode have opposite polarities, and the separator separates the first electrode and the second electrode.

[0088] One of the first and second electrodes is the positive electrode, and the other is the negative electrode. At least a portion of the separator is located between the positive and negative electrodes. During the charging and discharging of the battery cell 6, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0089] The positive electrode may include a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector.

[0090] In some embodiments, the electrode assembly 10 includes an electrode body and a plurality of tabs 11, the plurality of tabs 11 including a first tab and a second tab, the first tab and the second tab being led out from the electrode body. The first tab and the second tab have opposite polarities, in other words, one of the first tab and the second tab is a positive tab and the other is a negative tab.

[0091] As an example, the portion of the positive current collector coated with a positive electrode film, the portion of the negative current collector coated with a negative electrode film, the positive electrode film, the negative electrode film, and the separator constitute the electrode body. The portion of the positive current collector not coated with a positive electrode film constitutes the positive tab, and the portion of the negative current collector not coated with a negative electrode film constitutes the negative tab. The positive and negative tabs can be led out from the same end of the electrode body, or they can be led out from opposite ends of the electrode body.

[0092] In some embodiments, the electrode assembly 10 is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0093] In some embodiments, the electrode assembly 10 has a stacked structure.

[0094] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0095] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0096] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0097] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0098] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0099] In some embodiments, the housing 20 includes a wall portion 20a, which is provided with an injection hole 50. The wall portion 20a can be an end cap 22 or a shell wall of the housing 21. The injection hole 50 is provided through the wall portion 20a and is used to fill the battery cell 6 with electrolyte.

[0100] In some embodiments, the battery cell 6 includes a plurality of electrode terminals 30, the plurality of electrode terminals 30 including a first electrode terminal and a second electrode terminal. Optionally, both the first electrode terminal and the second electrode terminal are insulated from the end cap 22. Optionally, the first electrode terminal is riveted to the end cap 22, and the second electrode terminal is riveted to the end cap 22.

[0101] In some embodiments, the battery cell 6 further includes a pressure relief mechanism 60. The pressure relief mechanism 60 has a significant impact on the reliability of the battery cell 6. For example, when a short circuit or overcharging occurs, thermal runaway may occur inside the battery cell 6, causing a sudden increase in pressure. In this case, the pressure relief mechanism 60 can be activated to release the internal pressure to the outside, thereby reducing the risk of the battery cell 6 exploding or catching fire.

[0102] For example, the pressure relief mechanism 60 refers to a component or part that is actuated to release internal gas when the internal pressure or temperature of the battery cell 6 reaches a predetermined threshold. This threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 6.

[0103] The pressure relief mechanism 60 can take the form of an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically employ a pressure-sensitive element or structure. That is, when the internal pressure of the battery cell 6 reaches a predetermined threshold, the pressure relief mechanism 60 actuates or a weak area provided in the pressure relief mechanism 60 ruptures, thereby forming an opening or channel for internal pressure release. Alternatively, the pressure relief mechanism 60 can also employ a temperature-sensitive element or structure, that is, when the internal temperature of the battery cell 6 reaches a predetermined threshold, the pressure relief mechanism 60 actuates, thereby forming an opening or channel for internal pressure release.

[0104] When battery cell 6 experiences thermal runaway, the emissions from battery cell 6 include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0105] In some embodiments, the pressure relief mechanism 60 is disposed on the housing 20. Exemplarily, the pressure relief mechanism 60 may be disposed on the housing 21 or on the end cap 22.

[0106] Figure 4 for Figure 3 The diagram shows the structural connection between the end cap and the adapter plate. Figure 5 for Figure 4 A cross-sectional view along the AA direction; Figure 6 for Figure 3 The diagram shows a structural schematic of an adapter plate.

[0107] like Figures 3 to 6 As shown, this application embodiment provides a battery cell 6, including a housing 20, electrode terminals 30, electrode assembly 10, and adapter plate 40. The housing 20 includes a wall portion 20a, and the wall portion 20a is provided with a liquid injection hole 50. The electrode terminals 30 are disposed in the wall portion 20a. The electrode assembly 10 is disposed inside the housing 20 and includes tabs 11. The adapter plate 40 is disposed inside the housing 20 and includes a tab connecting portion 41 and a terminal connecting portion 42 connected to each other. The tab connecting portion 41 is connected to the tab 11, and the terminal connecting portion 42 is connected to the electrode terminal 30. The tab connecting portion 41 is provided with a first hollow area 43. In the thickness direction of the wall portion 20a, the first hollow area 43 is disposed opposite to the liquid injection hole 50.

[0108] The adapter piece 40 connects the electrode terminal 30 and the electrode assembly 10. The adapter piece 40 is made of a material with good electrical conductivity, such as metals like copper, nickel, and aluminum. Exemplarily, the adapter piece 40 can be a single piece or a combination of multiple pieces.

[0109] For example, the battery cell 6 includes a plurality of adapter pieces 40, such as one adapter piece 40 connected between the first electrode terminal and the first tab, and another adapter piece 40 connected between the second electrode terminal and the second tab.

[0110] The adapter plate 40 includes a tab connection part 41 and a terminal connection part 42, which can be an integral structure or a separate connection structure.

[0111] For example, the tab connection portion 41 is welded or bonded to the tab 11 to achieve electrical connection between the tab connection portion 41 and the tab 11. The terminal connection portion 42 is welded or bonded to the electrode terminal 30 to achieve electrical connection between the terminal connection portion 42 and the electrode terminal 30.

[0112] For example, the materials of the tab connection portion 41 and the terminal connection portion 42 may be the same or different.

[0113] The first hollow area 43 is a region that extends through the thickness of the adapter piece 40 along its thickness direction. For example, the first hollow area 43 can be formed on the tab connection portion 41 by processes such as cutting, stamping, and etching.

[0114] In one example, the projected shape of the first cutout area 43 can be a simple shape such as a circle, rectangle, or triangle, or a complex shape composed of simple shapes.

[0115] In another example, the first hollow area 43 may be formed by hollowing out the middle of the tab connection portion 41 or by default formed on the periphery of the tab connection portion 41.

[0116] The thickness direction of the wall portion 20a can be as follows: Figure 3 The first direction Z is shown.

[0117] The first hollow area 43 overlaps with the projection of the injection hole 50 in the first direction Z. For example, the projection of the injection hole 50 on the adapter piece 40 along the first direction Z is placed within the first hollow area 43. In one example, the center of the injection hole 50 may be opposite to the middle of the first hollow area 43 or opposite to other areas of the first hollow area 43.

[0118] When the volume of the battery cell 6 is small, a first hollow area 43 is provided in the tab connection part 41 of the adapter piece 40 to avoid the liquid injection hole 50. The flexible setting of the position of the liquid injection hole 50 makes the overall arrangement of the battery cell 6 more reasonable. With the size of the adapter piece maximized, the cycle performance of the battery cell 6 is improved, the current carrying capacity of the adapter piece 40 is increased, and the space utilization of the adapter piece 40 is higher.

[0119] Continue to refer to Figure 4 In some alternative embodiments of this application, the terminal connection portion 42 protrudes from the surface of the tab connection portion 41 facing the wall portion 20a; the wall portion 20a includes an electrode lead-out hole 70, the electrode terminal 30 covers the electrode lead-out hole 70, and at least a portion of the terminal connection portion 42 is accommodated in the electrode lead-out hole 70 and connected to the electrode terminal 30.

[0120] The terminal connection portion 42 protrudes along the first direction Z and is disposed on the tab connection portion 41. For example, the terminal connection portion 42 can be a solid protrusion or a hollow protrusion.

[0121] In one example, the tab connection portion 41 is recessed into the wall portion 20a along the first direction Z to form a terminal connection portion 42 that protrudes from the tab connection portion 41.

[0122] The adapter plate 40 is provided with one or more terminal connection portions 42.

[0123] The wall portion 20a is provided with an electrode lead-out hole 70 along the first direction Z. In one example, the wall portion 20a is an end cap 22, and the electrode lead-out hole 70 is provided through the end cap 22 along the thickness direction. The terminal connection portion 42 passes through the electrode lead-out hole 70 and is connected to the electrode terminal 30.

[0124] The electrode terminal 30 is disposed opposite to the electrode lead-out hole 70 along the first direction Z. The size of the electrode terminal 30 is greater than or equal to that of the electrode lead-out hole 70, so that the electrode terminal 30 covers the upper side of the electrode lead-out hole 70.

[0125] For example, the terminal connection portion 42 may be partially or entirely accommodated in the electrode lead-out hole 70.

[0126] The terminal connection portion 42 protrudes from the tab connection portion 41 to facilitate a secure connection with the electrode terminal 30. It also facilitates laser welding of the terminal connection portion 42 and the electrode terminal 30, reducing damage to the battery cell 6 from spatter during laser welding.

[0127] Figure 7 for Figure 3 Another structural schematic diagram of the adapter plate 40 shown.

[0128] like Figure 6 and Figure 7 As shown, in some optional embodiments of this application, the first hollow area 43 is disposed on the periphery of the tab connection portion 41.

[0129] The periphery of the tab connection portion 41 is the edge position of the tab connection portion 41 along its circumference. Exemplarily, at least one side of the first hollow area 43 has no boundary, that is, at least one side of the first hollow area 43 is open.

[0130] In one example, the tab connection 41 is recessed inward along the boundary to form a first hollow area 43.

[0131] To ensure the continuity of the adapter plate 40, the size of the first hollow area 43 is made smaller, thus ensuring the current carrying capacity of the adapter plate 40.

[0132] Continue to refer to Figure 4 and Figure 6 In some optional embodiments of this application, the battery cell 6 further includes a pressure relief mechanism 60 disposed on the wall portion 20a, and along the length direction of the wall portion 20a, a first hollow area 43 is disposed on the side of the electrode tab connection portion 41 opposite to the pressure relief mechanism 60.

[0133] The length direction of the wall portion 20a can be the second direction X.

[0134] In one example, the pressure relief mechanism 60 is located in the middle of the end cap 22, and the distance between the pressure relief mechanism 60 and the adapter plate 40 is less than or equal to the diameter of the injection hole 50.

[0135] In another example, the first hollow area 43 is placed on the periphery of the tab connection portion 41 and on the side away from the pressure relief mechanism 60. The first hollow area 43 is rectangular and has open sides, with one side facing away from the pressure relief mechanism 60.

[0136] By setting the first hollow area 43 on the side of the electrode connection part 41 away from the pressure relief mechanism 60, the effective space of the wall part 20a is better utilized, thereby improving the space utilization and current carrying capacity of the adapter piece 40.

[0137] Figure 8 for Figure 3 Another structural schematic diagram of the adapter plate 40 shown.

[0138] like Figure 8 As shown, in some optional embodiments of this application, the adapter piece 40 further includes a second hollow area 44. Along the width direction of the wall portion 20a, the first hollow area 43 and the second hollow area 44 are respectively disposed on both sides of the terminal connection portion 42; along the length direction of the wall portion 20a, the first hollow area 43 extends beyond the second hollow area 44.

[0139] The second hollow area 44 is a region formed along the thickness direction of the adapter piece 40 that extends through the thickness. For example, the second hollow area 44 and the first hollow area 43 are disposed opposite to each other along the third direction Y on both sides of the tab connection portion 41.

[0140] In one example, the second hollow area 44 is rectangular, with open sides, and one of the open sides is positioned opposite to the pressure relief mechanism 60.

[0141] The length of the first cutout area 43 along the first direction Z is longer than that of the second cutout area 44. For example, the length of the first cutout area 43 along the third direction Y can be equal to, less than, or greater than that of the second cutout area 44. The first cutout area 43 and the second cutout area 44 are asymmetrical in shape. The first direction Z, the second direction X, and the third direction Y are all perpendicular to each other.

[0142] By setting a second hollow area 44, the coverage area of ​​the adapter piece 40 is reduced, saving materials and lowering costs.

[0143] In one embodiment of this application, the adapter piece 40 includes second hollow areas 44 disposed opposite to each other on both sides of the terminal connection portion 42 along the width direction of the wall portion 20a. A first hollow area 43 is disposed on the periphery of the tab connection portion 41 and is recessed inward from the edge of the tab connection portion 41 along the second direction X, and the first hollow area 43 has an opening on one side.

[0144] Continue to refer to Figure 6As shown, in some optional embodiments of this application, the tab connection portion 41 includes a first connection portion 401, a second connection portion 402, and a third connection portion 403 arranged along the width direction of the wall portion 20a. The terminal connection portion 42 is at least partially connected to the second connection portion 402. The first connection portion 401 is connected to the tab 11, and the third connection portion 403 is connected to the tab 11. The second connection portion 402 has a first edge 404 and a second edge 405 disposed opposite to each other along the length direction of the wall portion 20a. In the direction from the first edge 404 to the second edge 405, both the first connection portion 401 and the third connection portion 403 protrude from the second edge 405. In the direction from the second edge 405 to the first edge 404, the first hollow area 43 is located on one side of the first connection portion 401.

[0145] The first connecting portion 401, the second connecting portion 402, and the third connecting portion 403 are arranged sequentially along a third direction Y, with the second connecting portion 402 connecting between the first connecting portion 401 and the third connecting portion 403. In one example, the first connecting portion 401, the second connecting portion 402, and the third connecting portion 403 all extend along a second direction X.

[0146] All or part of the terminal connection portion 42 is connected to the second connection portion 402. In one example, a portion of the terminal connection portion 42 is connected to the second connection portion 402, and another portion is connected to the third connection portion 403. In another example, a portion of the terminal connection portion 42 is connected to the second connection portion 402, and another portion is connected to the first connection portion 401.

[0147] For example, the battery cell 6 includes one or more electrode assemblies 10.

[0148] In one example, the battery cell 6 includes an electrode assembly 10, with a first connection portion 401 and a third connection portion 403 both connected to a first tab or a second tab.

[0149] For example, the first connecting portion 401 and the third connecting portion 403 are welded or bonded to the tab 11.

[0150] The lengths of the first edge 404 and the second edge 405 along the third direction Y can be the same or different.

[0151] The first edge 404 and the second edge 405 are set parallel to or at an angle to the second direction X.

[0152] For example, along the second direction X, the first connecting portion 401 and the third connecting portion 403 protrude from the second edge 405. The lengths of the first connecting portion 401 and the second connecting portion 402 protruding from the second edge 405 may be the same or different.

[0153] Since both the first connecting part 401 and the third connecting part 403 protrude from the second edge 405, the connection between the first connecting part 401 and the third connecting part 403 is reduced. When the first connecting part 401 and the third connecting part 403 are connected to the electrode tab 11 respectively, the stress distribution of the adapter piece 40 is changed, the stress concentration problem is alleviated, and the connection strength and durability of the adapter piece 40 are improved.

[0154] Figure 9 for Figure 3 Another structural schematic diagram of the adapter piece 40 shown; Figure 10 for Figure 3 Another structural schematic diagram of the adapter plate 40 shown; Figure 11 for Figure 10 The front view of the adapter piece 40 shown.

[0155] like Figures 9 to 11 As shown, in some optional embodiments of this application, the adapter piece 40 further includes a thickened portion 410, at least a portion of which is disposed on the side of the first connecting portion 401 away from the electrode assembly 10 and connected to the first connecting portion 401.

[0156] The thickened portion 410 can be integrally formed with the tab connection portion 41 or be separate from it. In one example, the thickened portion 410 is a sheet with a certain thickness and is welded to the tab connection portion 41. In another example, the thickened portion 410 is a thickness layer of the tab connection portion 41 along the first direction Z.

[0157] The material of the thickened portion 410 may be the same as or different from the material of the tab connection portion 41.

[0158] The number of thickened portions 410 can be one or more.

[0159] For example, the thickened portion 410 can be in the shape of a sheet, a protrusion, a strip, etc.

[0160] For example, the tab connection portion 41 includes a first surface and a second surface disposed opposite to each other along the first direction Z. The first surface is opposite to the electrode assembly 10 and opposite to the wall portion 20a. The thickened portion 410 is disposed on the first surface.

[0161] At least a portion of the thickened portion 410 covers the first connecting portion 401, that is, part or all of the thickened portion 410 is connected to the first connecting portion 401.

[0162] In one example, the thickened portion 410 is a continuously arranged sheet, with a portion of the thickened portion 410 connected to the first connecting portion 401 and another portion connected to the second connecting portion 402 and the third connecting portion 403. That is, the thickened portion 410 covers the tab connecting portion 41.

[0163] By connecting the thickened portion 410 to the first connecting portion 401, the risk of overcurrent bottleneck caused by the first hollowed-out area 43 is reduced, and the overcurrent capacity of the first connecting portion 401 is improved.

[0164] Continue to refer to Figure 9 In some alternative embodiments, a portion of the thickened portion 410 is disposed on the side of the second connecting portion 402 away from the electrode assembly 10 and is connected to the second connecting portion 402.

[0165] For example, a portion of the thickened portion 410 is connected to the first connecting portion 401, and another portion is connected to the second connecting portion.

[0166] The projected area of ​​the thickened portion 410 along the first direction Z on the first connecting portion 401 may be the same as or different from the projected area on the second connecting portion 402. In one example, the projected area of ​​the thickened portion 410 on the first connecting portion 401 is greater than the projected area on the second connecting portion 402.

[0167] Improve the current carrying capacity between the terminal connection part 42 and the first connection part 401.

[0168] In some alternative embodiments, the adapter piece 40 is integrally formed.

[0169] For example, the adapter piece 40 can be formed by mold integration, stamping integration, casting integration, etc.

[0170] For example, the tab connection portion 41, the terminal connection portion 42, and the thickened portion 410 are all integrally formed.

[0171] Improve the connection strength of the adapter plate 40 and reduce the impact of too many connection positions on the current carrying capacity of the adapter plate 40.

[0172] Continue to refer to Figure 10 and Figure 11 In some alternative embodiments, the orthographic projection of the first connecting portion 401 onto the thickened portion 410 is placed inside the thickened portion 410.

[0173] For example, the first connecting portion 401 completely covers the thickened portion 410. In one example, the area of ​​the first connecting portion 401 is equal to the area of ​​the thickened portion 410.

[0174] The first connecting part 401 is thickened to improve the current carrying capacity and reduce the difficulty of thickening the adapter piece 40.

[0175] In some alternative embodiments, the thickness H2 of the thickened portion 410 ranges from 1 mm to 2.5 mm. For example, the thickness of the thickened portion 410 is 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, or 2.5 mm. This ensures that the thickness of the thickened portion 410 meets the overcurrent requirements.

[0176] In one embodiment, the thickness H1 of the unthickened tab connection 41 ranges from 0.5 to 2 mm, for example, 0.5 mm, 1.5 mm, or 2 mm. The thickened portion 410 is connected to the first connection portion 401, such that the local thickness of the adapter piece 40 ranges from 1.5 to 3 mm, for example, 1.5 mm, 2 mm, 2.5 mm, or 3 mm.

[0177] Figure 12 for Figure 3 Another structural schematic diagram of the adapter plate 40 shown.

[0178] like Figure 12 As shown, in some alternative embodiments, the first connecting portion 401 extends beyond the third connecting portion 403 in the direction from the first edge 404 to the second edge 405.

[0179] For example, along the second direction X, the length of the first connecting portion 401 protruding from the second edge 405 is longer than the length of the third connecting portion 403 protruding from the second edge 405.

[0180] In one example, along the second direction X, the first hollow area 43 is disposed on the side of the first connecting portion 401 opposite to the pressure relief mechanism 60. Along the second direction X, the length of the first connecting portion 401 can be equal to or longer than the length of the third connecting portion 403.

[0181] By extending the length of the first connecting portion 401, the flow capacity of the first connecting portion 401 is improved.

[0182] like Figure 6 As shown, in some alternative embodiments, along the width direction of the wall portion 20a, the first connecting portion 401 has a third edge 406 away from the second connecting portion 402, and the third connecting portion 403 has a fourth edge 408 away from the second connecting portion 402; in the width direction of the wall portion 20a, the distance between the terminal connecting portion 42 and the third edge 406 is smaller than the distance between the terminal connecting portion 42 and the fourth edge 408.

[0183] Along a third direction Y, the third edge 406 and the fourth edge 408 are positioned opposite each other. Exemplarily, the third edge 406 and the fourth edge 408 are parallel or their extensions intersect.

[0184] In one example, the terminal connection portion 42 is placed on the second connection portion 402 and along the third direction Y, the width of the first connection portion 401 is equal to the width of the third connection portion 403, and the center of the terminal connection portion 42 is closer to the first connection portion 401 relative to the third connection portion 403.

[0185] By bringing the terminal connection portion 42 closer to the third edge 406 relative to the fourth edge 408, the current-carrying capacity between the terminal connection portion 42 and the first connection portion 401 and the third connection portion 403 is made closer.

[0186] In some embodiments, along the second direction X, the distance between the terminal connection portion 42 and the first edge 404 is less than the distance between the terminal connection portion 42 and the second edge 405.

[0187] In another embodiment, the thickened portion 410 is connected to the first connecting portion 401, and along the third direction Y, the distance between the terminal connecting portion 42 and the third edge 406 is equal to the distance between the terminal connecting portion 42 and the fourth edge 408.

[0188] In other embodiments, the thickened portion 410 is connected to the first connecting portion 401, and along the third direction Y, the distance between the terminal connecting portion 42 and the third edge 406 is greater than the distance between the terminal connecting portion 42 and the fourth edge 408.

[0189] Continue to refer to Figure 7 In some alternative embodiments, a portion of the terminal connection portion 42 is connected to the second connection portion 402, and a portion is connected to the first connection portion 401.

[0190] For example, the terminal connection portion 42 is projected along the first direction Z towards the tab connection portion 41, with a portion of the terminal connection portion 42 projected onto the first connection portion 401 and another portion projected onto the second connection portion 402.

[0191] By partially providing the terminal connection portion 42 to the first connection portion 401, the current-carrying capacity of the terminal connection portion 42 and the first connection portion 401 is improved.

[0192] Continue to refer to Figure 3 and Figure 12 In some optional embodiments of this application, multiple electrode assemblies 10 are provided, including a first electrode assembly and a second electrode assembly. A first connecting part 401 is connected to the first electrode assembly, and a third connecting part 403 is connected to the second electrode assembly.

[0193] For example, the first tab of the first electrode assembly is connected to the first connection portion 401, and the first tab of the second electrode assembly is connected to the second connection portion 402.

[0194] The adapter plate 40 can be connected to multiple electrode assemblies 10 respectively to meet the needs of the battery cells 6 of multiple electrode assemblies 10.

[0195] This application also provides a battery device, including the battery cell 6 described in the above embodiments.

[0196] This application embodiment also provides an electrical device configured to receive electrical energy provided by the battery device 2 described above.

[0197] This application provides a battery cell 6 including a housing 20, electrode terminals 30, electrode assembly 10, pressure relief mechanism 60, and adapter plate 40, a housing 21, and an end cap 22. The housing 21 has an opening, and the end cap 22 is connected to the housing 21 and closes the opening. The end cap 22 is provided with an injection hole 50; the electrode terminals 30 are disposed on the end cap 22; and the pressure relief mechanism 60 is disposed on the end cap 22. The electrode assembly 10 is disposed inside the housing 21 and includes tabs 11; the adapter plate 40 is disposed inside the housing 20 and includes a tab connecting portion 41 and a terminal connecting portion 42 connected to each other. The tab connecting portion 41 is connected to the tabs 11, and the terminal connecting portion 42 is connected to the electrode terminals 30. The tab connecting portion 41 is provided with a first hollow area 43, which is disposed opposite to the injection hole 50 in the first direction Z.

[0198] The terminal connection portion 42 protrudes from the surface of the tab connection portion 41 facing the end cover 22; the end cover 22 includes an electrode lead-out hole 70, and the electrode terminal 30 covers the electrode lead-out hole 70. At least a portion of the terminal connection portion 42 is accommodated in the electrode lead-out hole 70 and connected to the electrode terminal 30. The tab connection portion 41 is recessed into the end cover 22 along the first direction Z to form the terminal connection portion 42 protruding from the tab connection portion 41.

[0199] The tab connection portion 41 includes a first connection portion 401, a second connection portion 402 and a third connection portion 403 arranged along the width direction of the wall portion 20a. The first hollow area 43 is disposed on the periphery of the first connection portion 401 and is located on the side of the first connection portion 401 away from the pressure relief mechanism 60 along the second direction X.

[0200] Terminal connection portion 42 is at least partially connected to second connection portion 402, first connection portion 401 is connected to electrode tab 11, and third connection portion 403 is connected to electrode tab 11. Second connection portion 402 has a first edge 404 and a second edge 405 disposed opposite each other along the length direction of wall portion 20a. Both first connection portion 401 and third connection portion 403 protrude from the second edge 405 in the direction pointing from the second edge 405 to the first edge 404. A first hollow area 43 is located on one side of first connection portion 401. Along the third direction Y, first connection portion 401 has a third edge 406 away from second connection portion 402, and third connection portion 403 has a fourth edge 408 away from second connection portion 402. Adapter piece 40 is integrally formed.

[0201] In one embodiment, the adapter piece 40 further includes a thickened portion 410, a portion of which is disposed on the side of the first connecting portion 401 opposite to the electrode assembly 10 and connected to the first connecting portion 401. The first connecting portion 401 completely covers the thickened portion 410. The area of ​​the first connecting portion 401 is equal to the area of ​​the thickened portion 410. The thickness of the thickened portion 410 is 1.5 mm.

[0202] In another embodiment, the first connecting portion 401 extends beyond the third connecting portion 403 in the direction from the first edge 404 to the second edge 405.

[0203] In another embodiment, a portion of the terminal connection portion 42 is connected to the second connection portion 402, and a portion is connected to the first connection portion 401.

[0204] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0205] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized by, The application relates to a battery, which comprises: a shell comprising a wall part provided with a liquid injection hole; an electrode terminal arranged on the wall part; an electrode assembly arranged in the shell, the electrode assembly comprising a tab; an adapter plate arranged in the shell and comprising a tab connecting part and a terminal connecting part connected to each other, the tab connecting part being connected to the tab, the terminal connecting part being connected to the electrode terminal, the tab connecting part being provided with a first hollow area, the first hollow area being arranged opposite the liquid injection hole in the thickness direction of the wall part.

2. The battery cell of claim 1, wherein, The first hollow area is arranged on the circumferential side of the tab connecting part.

3. The battery cell according to claim 1 or 2, characterized in that, The battery further comprises a pressure relief mechanism arranged on the wall part, the first hollow area being arranged on the side of the tab connecting part away from the pressure relief mechanism in the length direction of the wall part.

4. The battery cell according to claim 1 or 2, characterized in that, The adapter plate further comprises a second hollow area, the first hollow area and the second hollow area being arranged on the two sides of the terminal connecting part in the width direction of the wall part. The first hollow area exceeds the second hollow area in the length direction of the wall part.

5. The battery cell of claim 1, wherein, The tab connecting part comprises a first connecting part, a second connecting part and a third connecting part arranged in the width direction of the wall part, the terminal connecting part being at least partially connected to the second connecting part, the first connecting part being connected to the tab, and the third connecting part being connected to the tab; The second connecting part has a first edge and a second edge arranged opposite each other in the length direction of the wall part, the first connecting part and the third connecting part being protruded from the second edge in the direction of the first edge pointing to the second edge along the first edge, and the first hollow area being located on the side of the first connecting part in the direction of the second edge pointing to the first edge along the second edge.

6. The battery cell of claim 5, wherein, The adapter plate further comprises a thickening part, at least part of the thickening part being arranged on the side of the first connecting part away from the electrode assembly and connected to the first connecting part.

7. The battery cell of claim 6, wherein, Part of the thickening part is arranged on the side of the second connecting part away from the electrode assembly and connected to the second connecting part.

8. The battery cell of claim 6, wherein, The adapter plate is integrally formed.

9. The battery cell of claim 6, wherein, The orthographic projection of the first connecting part to the thickening part is located in the thickening part.

10. The battery cell according to any one of claims 6 to 9, characterized in that, The thickness of the thickening part ranges from 1 mm to 2.5 mm.

11. The battery cell according to any one of claims 5 to 9, characterized in that, The first connecting part exceeds the third connecting part in the direction of the first edge pointing to the second edge along the first edge.

12. The battery cell of any one of claims 5 to 9, wherein, The first connecting part has a third edge away from the second connecting part in the width direction of the wall part, and the third connecting part has a fourth edge away from the second connecting part in the width direction of the wall part. The distance between the terminal connecting part and the third edge is smaller than the distance between the terminal connecting part and the fourth edge in the width direction of the wall part.

13. The battery cell of claim 12, wherein, Part of the terminal connecting part is connected to the second connecting part, and part of the terminal connecting part is connected to the first connecting part.

14. The battery cell of any one of claims 5 to 9, wherein, The electrode assembly is arranged in multiple, the multiple electrode assemblies comprising a first electrode assembly and a second electrode assembly, the first connecting part being connected to the first electrode assembly, and the third connecting part being connected to the second electrode assembly.

15. The battery cell of claim 1 or 2, wherein, The terminal connecting part is protruded from the surface of the tab connecting part facing the wall part. The wall portion includes an electrode lead hole, and the electrode terminal covers the electrode lead hole, and at least a portion of the terminal connecting portion is received in the electrode lead hole and connected to the electrode terminal.

16. A battery device characterized by comprising: A battery including the battery cell of any one of claims 1 to 15.

17. An electrical device, comprising: The electrical device is configured to receive electrical energy provided from the battery device of claim 16.

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