Battery monomer, switching piece, battery device and power utilization device

Abstract

The utility model provides a battery monomer, an adapter piece, a battery device and a power utilization device, the battery monomer comprises a battery shell, an electrode assembly, an end cover assembly and the adapter piece, the battery shell is enclosed to form a containing cavity with an opening, the electrode assembly is contained in the containing cavity, the end cover assembly covers the opening, the adapter piece is arranged between the electrode assembly and the end cover assembly, and the adapter piece is arranged between the electrode assembly and the end cover assembly. The adapter piece comprises an adapter piece body and an identification part, the identification part protrudes relative to the edge of the adapter piece body, and the end cover assembly is electrically connected with the electrode assembly through the adapter piece body. According to the battery monomer in the embodiment of the invention, the condition of welding dislocation of the adapter plate and the end cover assembly can be improved, and the reliability of electric connection between the electrode assembly and the end cover assembly is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, adapter, battery device, and power supply device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] The battery contains an adapter plate that connects the electrode assembly and end cap assembly of the battery cell, forming an electrical path between them. This adapter plate plays a crucial role in the battery's power supply stability. However, in existing battery cell assembly processes, misalignment during the welding of the adapter plate to the end cap assembly is prone to occur. This not only affects subsequent battery assembly but may also lead to electrical connection failure between the electrode assembly and the end cap assembly. Therefore, improving the positioning accuracy of the adapter plate and end cap assembly has become an urgent problem to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, an adapter piece, a battery device, and an electrical device, which can improve the welding misalignment between the adapter piece and the end cap assembly and improve the reliability of the electrical connection between the electrode assembly and the end cap assembly.

[0005] In a first aspect, this application provides a battery cell, including a battery casing, an electrode assembly, an end cap assembly, and an adapter piece. The battery casing encloses a receiving cavity with an opening, the electrode assembly is housed within the receiving cavity, the end cap assembly is closed to the opening, and the adapter piece is disposed between the electrode assembly and the end cap assembly. The adapter piece includes an adapter piece body and a marking portion disposed on the adapter piece body. The marking portion protrudes relative to the edge of the adapter piece body, and the end cap assembly is electrically connected to the electrode assembly through the adapter piece body.

[0006] In this embodiment, by providing a marking portion protruding from the edge of the adapter plate body, a position mark for positioning the adapter plate body can be formed through the marking portion. The adapter plate body can be aligned with the end cap assembly according to the position mark, thereby realizing the positioning welding of the adapter plate and the end cap assembly and improving the reliability of the electrical connection between the electrode assembly and the end cap assembly.

[0007] In some embodiments, the number of markings is two or more, and the two or more markings are spaced apart along the edge of the adapter body, which can improve positioning accuracy by recognizing two or more markings at the same time.

[0008] In some embodiments, the electrode assembly includes a battery cell body and a tab connected to the battery cell body, and the end cap assembly is provided with a pole. The adapter body includes a tab connection portion and a pole connection portion, the tab connection portion is connected to the tab, an identification portion is provided on the pole connection portion, and the pole connection portion is aligned and connected to the pole.

[0009] In this embodiment, by setting the marking part on the electrode connection part, the impact on the electrode connection part and the electrode welding can be reduced, and the reliability of the connection between the adapter piece and the electrode assembly can be improved.

[0010] In some embodiments, the marking portion and the pole connection portion are disposed on the same layer to reduce the space occupied by the adapter piece along its thickness direction, thereby reducing the impact of the marking portion on the assembly of the adapter piece body.

[0011] In some embodiments, electrode tabs are provided on both sides of the electrode post along the first direction, and electrode tab connecting portions are provided in pairs and respectively connected to the electrode tabs. The electrode post connecting portion extends along the first direction and connects to the electrode tab connecting portion. An identification portion is provided on at least one side of the electrode post connecting portion along the second direction, the second direction intersecting the first direction.

[0012] In some embodiments, in the first direction, the marking portion is located between the tab connections, and the end of the marking portion is at a certain distance from the tab connection portion along the first direction, which can prevent the marking portion from contacting the tab connection portion, thereby reducing the risk of forming another parallel path due to the tab connection portion being connected to the pole connection portion through the marking portion, and improving the reliability of the electrical connection between the end cap assembly and the electrode assembly.

[0013] In some embodiments, the ratio of the dimension of the marking portion along the first direction to the dimension of the pole post connection portion along the first direction is 0.2 to 0.8, which can facilitate machine recognition of the marking portion while reducing the risk of an additional parallel path being formed between the pole post connection portion and the pole post connection portion due to contact between the marking portion and the pole post connection portion.

[0014] In some embodiments, the end cap assembly includes an end cap plate and a plastic plate disposed on the side of the end cap plate facing the electrode assembly. An electrode post is disposed on the end cap plate, and the plastic plate protrudes to the side away from the end cap plate to form a limiting portion. The electrode post connecting portion abuts against the limiting portion in a second direction.

[0015] In the embodiments of this application, by providing a limiting part protruding from the plastic plate on the side opposite to the end cover plate and forming a limiting part, on the one hand, when the adapter piece and the end cover assembly are aligned, the limiting part can first pre-position the adapter piece body by means of the limiting part, and then finely adjust the position of the adapter piece body according to the position mark, thereby improving the alignment efficiency between the adapter piece body and the end cover assembly. On the other hand, during the alignment and welding process of the adapter piece body and the end cover assembly, the limiting part can also restrict the degree of freedom of the adapter piece body along the second direction, thereby further improving the reliability of the welding process.

[0016] In some embodiments, in the second direction, two or more marking portions are located on the side of the electrode connection portion facing the limiting portion and are spaced apart along the first direction. The limiting portion is sandwiched between two adjacent marking portions along the first direction, so that the limiting portion cooperates with the marking portion to limit the adapter piece along the first direction, thereby further improving the positioning accuracy of the adapter piece and the end cap assembly and improving the reliability of the electrical connection between the end cap assembly and the electrode assembly.

[0017] In some embodiments, the corners of the marking portion and / or the adapter plate body are provided with an arc transition to reduce damage to the end cap assembly and electrode assembly when the adapter plate is aligned and welded to them, thereby improving the reliability and service life of the battery cell.

[0018] Secondly, embodiments of this application provide an adapter for a battery cell. The adapter includes an adapter body and an identification portion disposed on the adapter body. The identification portion protrudes relative to the edge of the adapter body. The adapter body is used to electrically connect the end cap assembly of the battery cell to the electrode assembly.

[0019] Thirdly, embodiments of this application provide a battery device including a plurality of battery cells according to the first aspect.

[0020] Fourthly, embodiments of this application provide an electrical device, including the battery device of the third aspect.

[0021] According to an embodiment of this application, a battery cell includes a battery casing, an electrode assembly, an end cap assembly, and an adapter piece, with the adapter piece disposed between the electrode assembly and the end cap assembly. The adapter piece includes an adapter piece body and a marking portion disposed on the adapter piece body. The marking portion protrudes from the edge of the adapter piece body to form a position mark. Therefore, when the adapter piece body is connected to the end cap assembly, the adapter piece body can be aligned with the end cap assembly via the position mark, thereby enabling aligned welding with the end cap assembly, improving the welding misalignment between the adapter piece and the end cap assembly, and enhancing the reliability of the electrical connection between the electrode assembly and the end cap assembly.

[0022] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0023] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. 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:

[0024] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0025] Figure 2 This is an exploded schematic diagram of a battery device provided in some embodiments of this application;

[0026] Figure 3 These are exploded schematic diagrams of individual battery cells provided in some embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the structure of the adapter provided in some embodiments of this application;

[0028] Figure 5 This is a top view of a battery cell provided in some embodiments of this application;

[0029] Figure 6 yes Figure 5 Cross-sectional view along the AA direction;

[0030] Figure 7 yes Figure 6 Enlarged view of point B in the middle;

[0031] Figure 8 This is a schematic diagram of the structure of the adapter plate provided in some other embodiments of this application;

[0032] Figure 9 This is a schematic diagram of the structure of a portion of the end cap assembly provided in some embodiments of this application;

[0033] Figure 10 This is a schematic diagram of the structure of the adapter provided in some embodiments of this application.

[0034] The reference numerals in the detailed embodiments are as follows:

[0035] 100 battery packs, 200 controllers, 300 motors;

[0036] 10 individual battery cells, 20 casing cells;

[0037] 1 Battery casing, 2 Electrode assembly, 21 Cell body, 22 Tab, 3 End cap assembly, 31 End cap plate, 32 Terminal post, 33 Plastic plate, 331 Limiting part, 4 Adapter piece, 41 Adapter piece body, 411 Tab connection part, 412 Terminal post connection part, 42 Marking part.

[0038] X is the second direction, and Y is the first direction. Detailed Implementation

[0039] 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.

[0040] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0041] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0042] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] 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.

[0046] A single battery cell includes an electrode assembly, an adapter plate, and an end cap assembly. The adapter plate is positioned between the electrode assembly and the end cap assembly to achieve electrical connection between them. The adapter plate is used to prevent damage to the battery or burnout of other components in the event of a short circuit in the electrode assembly or overcharging / overdischarging, thereby improving the reliability of battery use.

[0047] The applicant noted that during battery cell assembly, adapter plates are typically welded to the electrode assembly, then placed in the appropriate position on the end cap assembly, and finally welded together. However, positioning issues can arise when placing the adapter plate in the appropriate position on the end cap assembly, potentially leading to misalignment between the adapter plate and the end cap assembly. This not only affects subsequent battery assembly but also the electrical connection between the electrode assembly and the end cap assembly, causing the electrical connection between them to fail.

[0048] Based on the above considerations, in order to solve the above technical problems, this application provides a new adapter piece. By setting an identification part on the adapter piece, the position of the sensing adapter piece can be identified during welding, thereby enabling the positioning welding of the adapter piece and the end cap assembly, and improving the reliability of the electrical connection between the electrode assembly and the end cap assembly.

[0049] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0050] 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.

[0051] It should be understood that the technical solutions described in the embodiments of this application are applicable to all electrical devices including battery device 100 and those using batteries, but for the sake of brevity, the following embodiments are all described using electric vehicles as examples.

[0052] Please see Figure 1 , Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0053] The vehicle has a battery device 100 installed inside, which can be located at the bottom, front, or rear of the vehicle. The battery device 100 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the vehicle's power needs during starting, navigation, and driving.

[0054] Please see Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of this application.

[0055] The battery device 100 mentioned in the embodiments of this application may include one or more battery cells 10 assemblies for providing voltage and capacity. A battery cell 10 assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via a busbar. A battery cell 10 assembly may be a battery module, which is formed by arranging and fixing multiple battery cells 10 into an independent module.

[0056] In some embodiments, the battery device 100 may be a battery pack, which includes a housing 20 and one or more battery cell 10 assemblies. The battery cell 10 assemblies are housed in the housing 20 to encapsulate one or more battery cells 10 and prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells 10.

[0057] In this embodiment of the application, the battery cell 10 can be a secondary battery, which refers to the battery cell 10 that can be used again after being discharged by recharging to activate the active material.

[0058] The battery cell 10 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.

[0059] Please refer to the following: Figure 3 and Figure 4 , Figure 3 This application shows an exploded schematic diagram of a battery cell 10 provided in some embodiments. Figure 4 A schematic diagram of the structure of the adapter piece 4 provided in some embodiments of this application is shown.

[0060] This application provides a battery cell 10, which includes a battery casing 1, an electrode assembly 2, an end cap assembly 3, and an adapter piece 4.

[0061] The battery housing 1 is an assembly used to cooperate with the end cap assembly 3 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 2, electrolyte, and other components. The battery housing 1 and the end cap assembly 3 can be independent components. The battery housing 1 encloses and forms a receiving cavity with an opening, and the end cap assembly 3 closes the opening and isolates the internal environment of the battery cell 10 from the external environment.

[0062] The adapter plate 4 is disposed between the electrode assembly 2 and the end cap assembly 3. The adapter includes an adapter plate body 41 and an identification portion 42 disposed on the adapter plate body 41. The identification portion 42 protrudes relative to the edge of the adapter plate body 41. The end cap assembly 3 is electrically connected to the electrode assembly 2 through the adapter plate body 41.

[0063] In this embodiment, the battery cell 10 is configured to electrically connect the electrode assembly 2 and the end cap assembly 3 via an adapter piece 4. The adapter piece 4 includes an adapter piece body 41 and a marking portion 42. The marking portion 42 protrudes from the edge of the adapter piece body 41 and forms a position mark. Therefore, when the adapter piece body 41 is connected to the end cap assembly 3, the adapter piece body 41 can be aligned with the end cap assembly 3 via the position mark, thereby enabling aligned welding with the end cap assembly 3, improving the welding misalignment between the adapter piece 4 and the end cap assembly 3, and enhancing the reliability of the electrical connection between the electrode assembly 2 and the end cap assembly 3.

[0064] It is understood that the marking part 42 refers to a component used to provide accurate position information for the machine, so that the production equipment can accurately identify the location of the adapter piece 4 during automated operation. In the embodiments of this application, by making the marking part 42 protrude from the edge of the adapter piece body 41, it can reduce the impact on the adapter piece body 41 while playing a marking role, and the marking part 42 can be applied to adapter piece bodies 41 of various structural forms, with a simple and reliable structure.

[0065] Optionally, the marking part 42 can be integrated with the adapter plate body 41.

[0066] Optionally, the orthographic projection of the marking part 42 in the plane where the adapter piece 4 is located can be set as at least one of a rectangle, a semicircle, or a triangle. For example, the marking part 42 can be set as a rectangle to simplify the structure of the marking part 42 and reduce the molding difficulty of the adapter piece 4.

[0067] It should be understood that in some other embodiments, the marking portion 42 can also be equivalently configured as a groove or a hole structure located on the adapter plate body 41. Alternatively, the marking portion 42 can also form a high-contrast color with the adapter plate body 41, so that the marking portion 42 can be more easily captured or identified by the machine through color. The marking portion 42 can also be configured in a combination of various forms. That is, when the marking portion 42 is set to protrude from the adapter plate body 41, the marking portion 42 and the adapter plate body 41 can form a high-contrast color. That is, the specific form of the marking portion 42 can also be replaced with other equivalents, as long as the marking portion 42 can effectively achieve the positioning of the adapter plate body 41. For ease of description, the embodiments of this application are all described with the marking portion 42 protruding relative to the adapter plate body 41 as an example.

[0068] In some alternative embodiments, the number of marking portions 42 is two or more, and the two or more marking portions 42 are spaced apart along the edge of the adapter body 41.

[0069] The number of marking parts 42 can be one, or two or more. When there are two or more marking parts 42, they can be spaced apart along the edge of the adapter body 41, which can improve positioning accuracy by recognizing two or more marking parts 42 at the same time. At the same time, by setting multiple marking parts 42, it is also possible to help determine the rotation angle or attitude of the adapter body 41, so as to more reliably achieve the positioning of the adapter 4 and improve the reliability of welding the adapter 4 and the end cap assembly 3.

[0070] Please see Figures 3 to 7 , Figure 5 A top view of a battery cell 10 provided in some embodiments of this application is shown. Figure 6 It shows Figure 5 Cross-sectional view along the AA direction. Figure 7 It shows Figure 6 Enlarged view of point B in the middle.

[0071] For the battery cell 10, in some optional embodiments, the electrode assembly 2 includes a cell body 21 and a tab 22 connected to the cell body 21, and the end cap assembly 3 is provided with a terminal post 32. The adapter body 41 includes a tab connection portion 411 and a terminal post connection portion 412, the tab connection portion 411 being connected to the tab 22, and the terminal post connection portion 412 being connected to the terminal post 32.

[0072] Electrode assembly 2 is the component in the battery cell 10 where the electrochemical reaction occurs. The casing may contain one or more electrode assemblies 2. The electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets with active material constitute the cell body 21 of the electrode assembly 2, and the portions of the positive and negative electrode sheets without active material each constitute a tab 22, which includes a positive tab and a negative tab.

[0073] The end cap assembly 3 includes an end cap plate 31 and a terminal post 32. The end cap plate 31 is a component that covers the opening of the battery casing 1 to isolate the internal environment of the battery cell 10 from the external environment. The terminal post 32 is used to electrically connect to the cell assembly to output or input electrical energy from the battery cell 10. The terminal post 32 includes a positive terminal post and a negative terminal post. The positive terminal post is used to connect to the positive terminal post, and the negative terminal post is used to connect to the negative terminal post.

[0074] Corresponding to the electrode assembly 2 and the end cap assembly 3, the adapter body 41 includes a tab connection portion 411 and a terminal connection portion 412. The tab connection portion 411 is a structure in the adapter body 41 for connecting with the tab 22, and the terminal connection portion 412 is a structure in the adapter body 41 for connecting with the terminal 32. Thus, the electrode assembly 2 and the end cap assembly 3 can be connected through the adapter 4 to form a current loop between the tab 22 and the terminal 32 during the charging and discharging process of the battery.

[0075] In the battery cell 10 of this application embodiment, when connecting the electrode assembly 2 and the end cap assembly 3 through the adapter plate 4, the tab connection portion 411 of the adapter plate body 41 can be welded to the tab 22 of the electrode assembly 2 first, and then the positioning of the adapter plate body 41 can be achieved by visually recognizing the marking portion 42 on the adapter plate body 41, so that the terminal post connection portion 412 of the adapter plate body 41 can be aligned with the terminal post 32 of the end cap assembly 3, thereby achieving precise welding of the adapter plate body 41 and the end cap assembly 3.

[0076] By providing a marking portion 42 on the adapter plate body 41, the misalignment and poor soldering of the adapter plate body 41 on the end cap assembly 3 can be effectively improved, increasing the connection strength and connection area between the adapter plate body 41 and the end cap assembly 3, thus securing the adapter plate body 41. When the battery cell 10 is subjected to external impact, the risk of the adapter plate 4 partially or completely detaching from the terminal post 32, resulting in insufficient current handling capacity or complete circuit breakage of the battery cell 10, can be reduced, thereby improving the service life of the secondary battery.

[0077] In some alternative embodiments, the marking portion 42 is disposed on the pole connection portion 412.

[0078] Since the electrode assembly 2 and the end cap assembly 3 need to be connected by connecting the tab connection portion 411 of the adapter body 41 to the tab 22 of the electrode assembly 2 first when connecting the electrode assembly 2 and the electrode assembly 3 through the adapter piece 4, the influence on the welding of the tab connection portion 411 and the tab 22 can be reduced by setting the marking portion 42 on the electrode post connection portion 412, compared with setting the marking portion 42 on the tab connection portion 411, thus improving the reliability of the connection between the adapter piece 4 and the electrode assembly 2.

[0079] In some alternative embodiments, the marking part 42 and the pole connection part 412 are disposed on the same layer, that is, the marking part 42 and the adapter body 41 are in the same plane.

[0080] When the marking part 42 is provided on the terminal post connection part 412, by providing the marking part 42 and the terminal post connection part 412 at the same layer, the impact on the assembly of the adapter piece 4 can be reduced, and the space occupied by the adapter piece 4 along its thickness direction can be reduced, making the internal arrangement of the battery cell 10 more compact and improving the energy density of the battery cell 10. In addition, it also makes the processing and forming of the adapter piece 4 more convenient.

[0081] It is understandable that for the adapter piece 4, its pole connection part 412 and pole tab connection part 411 can be arranged in the same layer, or they can have a certain height difference along the thickness direction of the adapter piece 4. This application embodiment does not specifically limit this, that is, it is sufficient to meet the requirement that when the marking part 42 is provided on the pole connection part 412, the marking part 42 and the pole connection part 412 are arranged in the same layer.

[0082] Please see Figure 3 , Figure 4 and Figure 8 , Figure 8 A schematic diagram of the structure of the adapter piece 4 provided in some other embodiments of this application is shown.

[0083] In some alternative embodiments, the pole post 32 is provided with pole tabs 22 on both sides along the first direction Y, the pole tab connecting portions 411 are provided in pairs and respectively connected to the pole tabs 22, and the pole post connecting portion 412 is connected to the pole tab connecting portion 411. The marking portion 42 is provided on at least one side of the pole post connecting portion 412 along the second direction X, the second direction X intersecting the first direction Y.

[0084] When the battery cell 10 includes multiple electrode components 2, tabs 22 are provided on both sides of the electrode post 32. Therefore, the adapter piece 4 can be provided with two tab connection parts 411. The two tab connection parts 411 are arranged in pairs along the first direction Y and are respectively connected to the tabs 22. The two ends of the electrode post connection part 412 along the first direction Y are connected to the tab connection parts 411.

[0085] It is understood that the tab connection 411 extends along the second direction X, the pole connection 412 can be connected to the middle of the tab connection 411, the adapter body 41 has an I-shaped structure, the pole connection 412 can also be connected to the end of the tab connection 411, and the adapter body 41 has a U-shaped structure.

[0086] Taking the adapter body 41 as having a U-shaped structure as an example, the marking part 42 being disposed on at least one side of the pole connection part 412 along the second direction X means that the marking part 42 may be disposed only within the space enclosed by the U-shaped structure, or it may be located only outside the space enclosed by the U-shaped structure. The marking part 42 is also divided into two parts, one part of which is located within the space enclosed by the U-shaped structure, and the other part is located outside the space enclosed by the U-shaped structure.

[0087] It is understandable that when the marking part 42 is provided on both sides of the pole post connection part 412 along the second direction X, the marking parts 42 on both sides can be symmetrically arranged relative to the pole post connection part 412 to simplify the structure of the adapter piece 4. The marking parts 42 on both sides can also be asymmetrically arranged, and their specific positions can be adjusted according to the requirements of the adapter piece 4.

[0088] In some alternative embodiments, in the first direction Y, the marking portion 42 is located between the tab connecting portions 411, and the end of the marking portion 42 is at a certain distance from the tab connecting portion 411 along the first direction Y.

[0089] The marking portion 42 located within the space enclosed by the U-shaped structure has tab connecting portions 411 on both sides along the first direction Y. By maintaining a certain distance between the end of the marking portion 42 and the tab connecting portion 411 along the first direction Y, contact between the marking portion 42 and the tab connecting portion 411 can be avoided. This reduces the risk of forming another parallel path due to the tab connecting portion 411 connecting to the pole connecting portion 412 through the marking portion 42, thereby improving the reliability of the electrical connection between the end cap assembly 3 and the electrode assembly 2.

[0090] In some alternative embodiments, the ratio of the dimension of the marking portion 42 along the first direction Y to the dimension of the pole post connecting portion 412 along the first direction Y is 0.2 to 0.8.

[0091] It should be noted that the number of marking parts 42 located within the space enclosed by the U-shaped structure may be one or more. When the number of marking parts 42 located within the space enclosed by the U-shaped structure is more than one, the dimension of the marking part 42 along the first direction Y refers to the sum of the dimensions of the multiple marking parts 42 located within the space enclosed by the U-shaped structure along the first direction Y.

[0092] By making the ratio of the dimension of the marking portion 42 along the first direction Y to the dimension of the electrode connection portion 412 along the first direction Y greater than or equal to 0.2, the marking portion 42 can extend a sufficient distance along the first direction Y to facilitate machine recognition of the marking portion 42 and improve positioning accuracy. Conversely, by making the ratio of the dimension of the marking portion 42 along the first direction Y to the dimension of the electrode connection portion 412 along the first direction Y less than or equal to 0.8, the risk of an additional parallel path being formed between the electrode connection portion 411 and the electrode connection portion 412 during charging and discharging of the battery cell 10 due to contact between the marking portion 42 and the electrode connection portion 411 can be effectively reduced, thus improving the reliability of the electrical connection between the end cap assembly 3 and the electrode assembly 2.

[0093] Optionally, the ratio of the dimension of the marking part 42 along the first direction Y to the dimension of the pole post connecting part 412 along the first direction Y is 0.6, so as to take into account both the advantages of high positioning accuracy and high reliability.

[0094] In some alternative embodiments, the dimension of the marking portion 42 along the second direction X can be set to 0 to 10 mm.

[0095] The dimension of the marking part 42 along the second direction X is the dimension of the marking part 42 protruding from the main body of the adapter piece 4 along the second direction X. By making the dimension of the marking part 42 along the second direction X less than or equal to 10mm, it is possible to facilitate the machine to identify the marking part 42, reduce the impact of the marking part 42 on the performance of the adapter piece 4, reduce the space occupied by the marking part 42, and improve the applicability of the marking part 42.

[0096] Optionally, the dimension of the marking part 42 along the second direction X can be set to 4mm to 6mm. The specific value of the dimension of the marking part 42 along the second direction X can be adjusted according to the specific parameters of the adapter piece 4. This can reduce the space occupied by the marking part 42 while forming a position mark for positioning the adapter piece body 41.

[0097] Please see Figures 3 to 9 , Figure 9A schematic diagram of the structure of a portion of the end cap assembly 3 provided in some embodiments of this application is shown.

[0098] In some alternative embodiments, the end cap assembly 3 includes an end cap plate 31 and a plastic plate 33 disposed on the side of the end cap plate 31 facing the electrode assembly 2. The electrode post 32 is disposed on the end cap plate 31. The plastic plate 33 protrudes to the side away from the end cap plate 31 and forms a limiting portion 331. The electrode post connecting portion 412 abuts against the limiting portion 331 along the second direction X.

[0099] The end cap assembly 3 may include an end cap plate 31 and a plastic plate 33 stacked together. The plastic plate 33 is disposed on the side of the end cap plate 31 facing the electrode assembly 2, so as to improve the sealing performance of the battery cell 10 after the end cap plate 31 covers the opening of the battery housing 1.

[0100] In some embodiments, by making the plastic plate 33 protrude from the side opposite to the end cover plate 31 to form a limiting part 331, on the one hand, when the adapter piece 4 and the end cover assembly 3 are aligned, the limiting part 331 can first pre-position the adapter piece body 41, and then finely adjust the position of the adapter piece body 41 according to the position mark, thereby improving the alignment efficiency between the adapter piece body 41 and the end cover assembly 3. On the other hand, during the alignment and welding process between the adapter piece body 41 and the end cover assembly 3, the limiting part 331 can restrict the degree of freedom of the adapter piece body 41 along the second direction X, thereby further improving the reliability of the welding process.

[0101] Optionally, the number of limiting parts 331 can be one or more. When there are multiple limiting parts 331, the multiple limiting parts 331 can be arranged in pairs along the second direction X to form a limiting position of the adapter piece 4 along the second direction X.

[0102] It is understandable that in some embodiments, the adapter piece 4 can be positioned using only multiple limiting portions 331 to position and weld the adapter piece 4 to the end cap assembly 3. However, considering manufacturing errors, in practical applications, there may be a problem where the distance of the limiting portions 331 along the second direction X is greater than a preset value, causing the adapter piece 4 to still have a certain degree of freedom in the second direction X when it is positioned between multiple limiting portions 331, thus affecting the welding accuracy between the adapter piece 4 and the end cap assembly 3. Therefore, by forming the limiting portions 331 on the end cap assembly 3 and providing the marking portion 42 on the adapter piece body 41, the positioning of the adapter piece 4 can be achieved more accurately, improving the reliability of the electrical connection between the end cap assembly 3 and the electrode assembly 2.

[0103] In some alternative embodiments, in the second direction X, two or more marking portions 42 are located on the side of the pole post connection portion 412 facing the limiting portion 331 and are spaced apart along the first direction Y, and the limiting portion 331 is sandwiched between two adjacent marking portions 42 along the first direction Y.

[0104] Since the marking part 42 protrudes from the edge of the adapter body 41, by providing two or more marking parts 42 on the side of the pole connection part 412 facing the limiting part 331 along the second direction X, it is not only easier to identify, but also the limiting part 331 can be sandwiched between two adjacent marking parts 42 along the first direction Y. The limiting part 331 and the marking part 42 cooperate to limit the adapter 4 along the first direction Y, thereby further improving the positioning accuracy of the adapter 4 and the end cap assembly 3 and improving the reliability of the electrical connection between the end cap assembly 3 and the electrode assembly 2.

[0105] Please see Figure 4 , Figure 8 as well as Figure 10 , Figure 10 A schematic diagram of the structure of the adapter piece 4 provided in some embodiments of this application is shown.

[0106] In some alternative embodiments, the corners of the marking portion 42 and / or the adapter plate body 41 are provided with an arc-shaped transition. That is, the corners of the marking portion 42 and / or the adapter plate body 41 are provided with transition rounded corners to reduce the damage to the end cap assembly 3 and the electrode assembly 2 when the adapter plate 4 is aligned and welded with the end cap assembly 3 and the electrode assembly 2, thereby improving the reliability and service life of the battery cell 10.

[0107] Optionally, some corners of the adapter plate body 41 are also chamfered to make the adapter plate 4 form an asymmetrical structure, which serves to prevent mistaken identity.

[0108] Please see Figures 1 to 10 The battery cell 10 provided in this application embodiment includes a battery casing 1, an electrode assembly 2, an end cap assembly 3, and an adapter plate 4. The adapter plate 4 includes an adapter plate body 41, which includes a tab connection portion 411 and a terminal connection portion 412. The tab connection portions 411 are arranged in pairs along the first direction Y and are respectively connected to the tabs 22 of the electrode assembly 2. The terminal connection portion 412 extends along the first direction Y and connects to the tab connection portion 411. The terminal connection portion 412 is used to connect to the terminal 32 of the end cap assembly 3.

[0109] The adapter plate 4 also includes a marking portion 42 disposed on the adapter plate body 41. The marking portion 42 is disposed on at least one side of the electrode connection portion 412 along the second direction X. The marking portion 42 is disposed on the same layer as the electrode connection portion 412 and protrudes relative to the edge of the electrode connection portion 412 to form a position mark. The adapter plate body 41 is configured to align the electrode connection portion 412 with the electrode 32 according to the position mark, thereby realizing the positioning welding of the adapter plate body 41 and the end cap assembly 3, improving the welding misalignment between the adapter plate 4 and the end cap assembly 3, and improving the reliability of the electrical connection between the electrode assembly 2 and the end cap assembly 3.

[0110] It should be noted that the adapter 4 disclosed in this application can be used in the battery cell 10 and as a component of the battery cell 10, or it can be manufactured or sold as an independent component. That is, the adapter 4 can be used in all battery devices 100 including the battery cell 10 and electrical devices including the battery device 100, but it is not limited to the battery cell 10. The adapter 4 disclosed in this application can also be used to provide fuse protection for other products in the event of short circuit or excessive current, and can increase the freedom and operability of product design.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The battery casing encloses and forms an opening-shaped receiving cavity; The electrode assembly is housed within the receiving cavity; End cap assembly, which closes the opening; An adapter piece is disposed between the electrode assembly and the end cap assembly. The adapter piece includes an adapter piece body and an identification portion disposed on the adapter piece body. The identification portion protrudes relative to the edge of the adapter piece body. The end cap assembly is electrically connected to the electrode assembly through the adapter piece body.

2. The battery cell according to claim 1, characterized in that, The number of the markings is two or more, and the two or more markings are spaced apart along the edge of the adapter plate body.

3. The battery cell according to claim 1 or 2, characterized in that, The electrode assembly includes a battery cell body and electrode tabs connected to the battery cell body, and the end cap assembly is provided with electrode posts; The adapter body includes a tab connection part and a pole connection part. The tab connection part is connected to the tab, and the marking part is disposed on the pole connection part. The pole connection part is aligned and connected to the pole.

4. The battery cell according to claim 3, characterized in that, The marking part and the pole connection part are arranged on the same layer.

5. The battery cell according to claim 3 or 4, characterized in that, The pole post is provided with tabs on both sides along the first direction, the tab connecting parts are provided in pairs and respectively connected to the tabs, and the pole post connecting part extends along the first direction and connects to the tab connecting part. The marking portion is disposed on at least one side of the pole connection portion along the second direction, the second direction intersecting the first direction.

6. The battery cell according to claim 5, characterized in that, In the first direction, the marking portion is located between the tab connecting portions, and the end of the marking portion is at a certain distance from the tab connecting portion along the first direction.

7. The battery cell according to claim 6, characterized in that The ratio of the dimension of the marking part along the first direction to the dimension of the pole connecting part along the first direction is 0.2 to 0.

8.

8. The battery cell according to claim 5, characterized in that, The end cap assembly includes an end cap plate and a plastic plate disposed on the side of the end cap plate facing the electrode assembly. The electrode post is disposed on the end cap plate. The plastic plate protrudes to the side away from the end cap plate and forms a limiting part. The electrode post connecting part abuts against the limiting part along the second direction.

9. The battery cell according to claim 8, characterized in that, In the second direction, two or more of the marked portions are located on the side of the pole connection portion facing the limiting portion and are spaced apart along the first direction, and the limiting portion is sandwiched between two adjacent marked portions along the first direction.

10. The battery cell according to any one of claims 1 to 9, characterized in that, The markings and / or the corners of the adapter plate body are provided with an arc-shaped transition.

11. An adapter plate for a battery cell, characterized in that, The adapter includes an adapter body and an identification portion disposed on the adapter body. The identification portion protrudes relative to the edge of the adapter body. The adapter body is used to electrically connect the end cap assembly of the battery cell to the electrode assembly.

12. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1-10.

13. An electrical appliance, characterized in that, Includes the battery device as described in claim 12.

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