Battery cell and battery device

Abstract

The utility model relates to a battery cell and a battery device. The battery cell includes an electrode assembly and an adhesive. The electrode assembly comprises a straight area, and a first corner area and a second corner area which are connected to two ends of the straight area; bonding pieces are arranged in the first corner area and the second corner area, and at least one bonding piece bypasses the corner of the first corner area from the inner wall of the first corner area and extends to the outer wall of the first corner area. And at least one bonding piece bypasses the corner of the second corner area from the inner wall of the second corner area and extends to the outer wall of the second corner area. The bonding piece can fasten all the pole pieces located in the corner area, the probability that the gap between every two adjacent pole pieces is increased is reduced, the gaps between every two adjacent pole pieces are consistent as much as possible, and the lithium precipitation phenomenon is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell and a battery device. Background Art

[0002] Electrode assemblies can be categorized as wound or laminated, depending on the method used to form them. Winding is faster, making it a widely used method for forming electrode assemblies. During the winding process, after the positive and negative electrode sheets and separators are wound, the separators and positive and negative electrodes need to be secured at the end of the separator to prevent the electrode assembly from loosening. The electrode assembly is then pressed down to shape the assembly.

[0003] However, when the electrode assembly is pressed down to be shaped, the electrode assembly tends to become loose, resulting in a large gap between adjacent pole pieces of the electrode assembly, thereby affecting the performance of the electrode assembly. Utility Model Content

[0004] In view of the above problems, the present application provides a battery cell and a battery device, which can improve the problem that when the electrode assembly is loosened during shaping, a large gap exists between adjacent electrode sheets of the electrode assembly, thereby affecting the performance of the electrode assembly.

[0005] In a first aspect, the present application provides a battery cell comprising an electrode assembly and an adhesive. The electrode assembly comprises a straight region and first and second corner regions connected at both ends of the straight region; adhesives are disposed in the first and second corner regions, with at least one adhesive extending from the inner wall of the first corner region, around the corner of the first corner region, to the outer wall of the first corner region, and at least one adhesive extending from the inner wall of the second corner region, around the corner of the second corner region, to the outer wall of the second corner region.

[0006] In the technical solution of the embodiment of the present application, the electrode assembly is wound into a cylindrical shape before being shaped, and then it is pressed down to change the shape of the electrode assembly. During the pressing and shaping process, because the adhesive is installed in the corner area similar to a headband, and the electrode assembly is wound and formed, the adhesive can tighten the part of the electrode assembly located in the corner area, so that the gap between the pole pieces in the corner area remains stable, and the probability of the inner ring diaphragm retracting and the pole piece retracting when the electrode assembly is shaped is reduced, resulting in an increase in the gap between adjacent pole pieces in the corner area. In this way, the adhesive can tighten all the pole pieces located in the corner area, reduce the probability of an increase in the gap between two adjacent pole pieces, make the gap between two adjacent pole pieces as consistent as possible, and reduce the occurrence of lithium plating.

[0007] In some embodiments, the first corner region includes a first corner and a second corner disposed opposite to each other along a first direction, and the adhesive disposed in the first corner region at least covers at least one of the first corner and the second corner;

[0008] The second corner region includes a third corner and a fourth corner arranged opposite to each other along a first direction, and the adhesive arranged in the second corner region covers at least one of the third corner and the fourth corner, wherein the first direction intersects with the winding direction of the electrode assembly.

[0009] In this way, an adhesive is provided in each corner area of ​​the electrode assembly, and the adhesive covers at least at least one corner of a single corner area. Without affecting the function of the adhesive, the flexibility of the adhesive is improved so that it can cover the corresponding corner as required.

[0010] In some embodiments, the adhesive member provided at the first corner includes a first section, a second section, and a third section, the first section and the third section are connected at both ends of the second section, the first section is located on the inner wall of the first corner, the third section is located on the outer wall of the first corner, and the length of the first section and the second section along the first direction is less than the length of the electrode assembly along the first direction.

[0011] The adhesive is bonded to the outside of the first corner to limit the position of the electrode at the first corner and reduce the possibility of increasing the gap between adjacent electrode pieces. Because the length of the first and second sections along the first direction is less than the length of the electrode assembly along the first direction, the amount of adhesive used can be minimized without affecting the amount of adhesive used.

[0012] In some embodiments, an adhesive member is provided at each of the first corner and the second corner, and the two adhesive members are spaced apart along the first direction.

[0013] In this way, compared with setting the adhesive member as a ring member, the cost of the adhesive member is saved, and the difficulty of installing the adhesive member is reduced, making it easier to install the adhesive member.

[0014] In some embodiments, the adhesive extends from the inner wall of the first corner region to the outer wall of the first corner region and covers the first corner and the second corner, wherein the adhesive is provided with an opening, and the opening is provided on the inner wall and / or the outer wall.

[0015] In this way, the adhesive can cover both corners of a corner area at the same time, which can maximize the effect of the adhesive while reducing the amount of adhesive used. In addition, because the adhesive is not closed, it is easy to install the adhesive on the electrode assembly.

[0016] In some embodiments, a length of the adhesive along the second direction is a, 0.1 mm < a < 0.2 mm, wherein the second direction is consistent with the winding direction of the electrode assembly.

[0017] In this way, the length of the adhesive along the second direction can be adjusted according to the winding thickness of the electrode assembly, so that the obtained adhesive can play a fastening role on the corner area of ​​the corresponding electrode assembly, reducing the probability that the corner area of ​​the electrode assembly will loosen due to the weakening of its fastening force due to insufficient length of the adhesive along the second direction.

[0018] In some embodiments, the thickness of the adhesive member is b, and 10 μm<b<50 μm.

[0019] This arrangement reduces the probability that the adhesive will be perforated during use due to its thin thickness, causing the adhesive to rupture and affect its performance, and improves the wear resistance and service life of the adhesive.

[0020] In some embodiments, the adhesive member is configured as an elastic member.

[0021] With this arrangement, when the adhesive is pressed down and shaped together with the electrode assembly, the adhesive can maintain a certain strength based on the deformation, so as to tighten the corner area of ​​the electrode assembly.

[0022] In some embodiments, the adhesive member is configured as a plastic member.

[0023] This arrangement reduces the difficulty of preparing the adhesive component and makes it easier to obtain the adhesive component.

[0024] In a second aspect, the present application provides a battery device comprising the battery cell in the above embodiment.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0027] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments.

[0028] Figure 2 FIG. 4 is an exploded view of a battery device according to one or more embodiments.

[0029] Figure 3 is a schematic diagram of the exploded structure of a battery cell according to one or more embodiments.

[0030] Figure 4 Schematic diagram of the structure of a reshaped battery assembly according to one or more embodiments.

[0031] Figure 5 Schematic diagram of the structure of a battery assembly before shaping according to one or more embodiments.

[0032] Figure 6 Schematic diagram of the structure of a battery assembly before shaping and with adhesive installed according to one or more embodiments.

[0033] Figure 7 Schematic diagram of the structure of a battery assembly before shaping and with adhesive installed according to one or more embodiments.

[0034] Figure 8 Schematic diagram of the structure of a battery assembly before shaping and with narrow adhesive installed according to one or more embodiments.

[0035] Figure 9 Schematic diagram of the structure of a battery assembly before shaping and with a wide adhesive installed according to one or more embodiments.

[0036] The accompanying drawings in the specific implementation manner are as follows:

[0037] 1000. Vehicle;

[0038] 100, battery device; 200, controller; 300, motor;

[0039] 10. Casing; 11. First part; 12. Second part; 20. Battery cell; 21. End cap; 21a. Electrode terminal; 22. Housing; 23. Electrode assembly; 231. Flat area; 232. First corner area; 2321. First corner; 2322. Second corner; 233. Second corner area; 2331. Third corner; 2332. Fourth corner; 30. Adhesive; 31. First section; 32. Second section; 33. Third section; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0040] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0042] In the description of the embodiments of this application, the use of technical terms such as "first" and "second" is solely for distinguishing different objects and should not be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary and secondary relationship of the technical features indicated. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0043] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] In the description of the embodiments of this application, the term "and / or" is used to describe the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document, if it appears, generally indicates that the related objects are in an "or" relationship.

[0045] In the description of the embodiments of the present application, if it appears, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present application, if any, technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0048] Currently, market developments indicate that power batteries are becoming increasingly widely used. Power batteries are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in aerospace and other fields. As power battery applications continue to expand, market demand is also growing.

[0049] During the battery device manufacturing process, the electrode assembly is first wound, then pressed and shaped, placed into a corresponding housing, and sealed to form a battery cell. Multiple battery cells are then processed through a series of processes to finally form a battery device.

[0050] When the electrode assembly of a battery cell is pressed down to shape, the diaphragm of the electrode assembly can drive the electrode pieces to retract due to external force, which can easily lead to an increase in the gap between adjacent electrode pieces of the electrode assembly, especially the gap in the corner area of ​​the electrode assembly after shaping is significantly increased, thereby affecting the performance of the electrode assembly.

[0051] In order to solve the above problems, some embodiments of the present application provide a battery cell, which includes an electrode assembly and an adhesive. The adhesive is arranged in the corner area of ​​the electrode assembly and extends from the inner wall of the corner area around the corner to the outer wall of the corner area, thereby applying a fastening force to the electrode piece in the corner area, reducing the probability of the electrode assembly becoming loose during the downward pressing and shaping process.

[0052] The battery cells disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power supply system for an electrical device comprising the battery cells, battery devices, etc. disclosed in the present application can be used.

[0053] The embodiments of the present application provide an electrical device that uses a battery device as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, an energy storage product, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the energy storage product may include an energy storage station, etc.

[0054] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0055] Please refer to Figure 1 , Figure 1 A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0056] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0057] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is used to provide a storage space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 can include a first portion 11 and a second portion 12, which overlap each other and together define a storage space for the battery cell 20. The second portion 12 can be a hollow structure with one end open. The first portion 11 can be a plate-like structure, with the first portion 11 overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define a storage space. The first portion 11 and the second portion 12 can also be hollow structures with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0058] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 20 may be housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0059] Each battery cell 20 may be a secondary battery or a primary battery, and may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.

[0060] Please refer to Figure 3 , Figure 3 The following is a schematic diagram of the decomposition structure of a battery cell 20 provided in some embodiments of the present application. A battery cell 20 is the smallest unit that makes up a battery. Figure 3 The battery cell 20 includes an end cap 21, a shell 22, an electrode assembly 23 and other functional components.

[0061] The end cap 21 is a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22. The end cap 21 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents deformation of the end cap 21 under compression or collision, thereby enhancing the structural strength and safety of the battery cell 20. The end cap 21 can be provided with functional components such as electrode terminals 21a. The electrode terminals 21a can be used to electrically connect to the electrode assembly 23 to transmit or receive electrical energy from the battery cell 20. In some embodiments, the end cap 21 can also be provided with a pressure relief mechanism to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The end cap 21 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiments. In some embodiments, an insulating member may be provided inside the end cap 21 to isolate the electrical connection components in the housing 22 from the end cap 21 to reduce the risk of short circuit. For example, the insulating member may be made of plastic, rubber, or the like.

[0062] The housing 22 is a component that cooperates with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can be used to accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and end cap 21 can be separate components. An opening can be provided in the housing 22, and the end cap 21 is placed over the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and housing 22 can be integrated. Specifically, the end cap 21 and housing 22 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 22 needs to be enclosed, the end cap 21 is placed over the housing 22. The housing 22 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, or a hexagonal prism. Specifically, the shape of the housing 22 can be determined based on the specific shape and size of the electrode assembly 23. The housing 22 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0063] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained in the housing 22. The electrode assembly 23 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 parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0064] See also Figure 4 and Figure 5 Some embodiments of the present application provide a battery cell 20, which includes an electrode assembly 23 and an adhesive 30. The electrode assembly 23 includes a straight region 231, a first corner region 232 connected to both ends of the straight region 231, and a second corner region 233; the adhesive 30 is disposed in the first corner region 232 and the second corner region 233, with at least one adhesive 30 extending from the inner wall of the first corner region 232, around the corner of the first corner region 232, to the outer wall of the first corner region 232, and at least one adhesive 30 extending from the inner wall of the second corner region 233, around the corner of the second corner region 233, to the outer wall of the second corner region 233.

[0065] The tensile strength of the adhesive 30 ranges from 40 MPa to 320 MPa in the transverse direction and from 100 MPa to 300 MPa in the longitudinal direction.

[0066] For example, the shape of the electrode assembly 23 can be, but is not limited to, a square or a rounded rectangle. Taking the rounded rectangle as an example, the electrode assembly 23 can be divided into a first corner region 232, a straight region 231, and a second corner region 233. The first corner region 232 and the second corner region 233 correspond to the rounded corners of the rounded rectangle. The first corner region 232 and the second corner region 233 are each provided with an adhesive 30. The adhesive 30 is provided on the surface of the corner region (i.e., the first corner region 232 and the second corner region 233 mentioned above, hereinafter referred to as the corner region) and extends from the inner wall to the outer wall of the corner region.

[0067] Before being shaped, the electrode assembly 23 is wound into a cylindrical shape, and then pressed down to change its shape. During the pressing and shaping process, because the adhesive 30 is installed in the corner area similar to a headband, and the electrode assembly 23 is wound, the adhesive 30 can tighten the portion of the electrode assembly 23 located in the corner area, thereby maintaining a stable gap between the electrode pieces in the corner area. This reduces the probability that the retraction of the inner ring diaphragm of the electrode assembly 23 during the shaping process will drive the retraction of the electrode pieces, resulting in an increase in the gap between adjacent electrode pieces in the corner area.

[0068] In this way, the adhesive 30 can fasten all the electrode pieces located in the corner area, reduce the probability of the gap between two adjacent electrode pieces increasing, make the gap between two adjacent electrode pieces as consistent as possible, and reduce the occurrence of lithium plating.

[0069] like Figure 4 As shown, in some embodiments, the first corner area 232 includes a first corner 2321 and a second corner 2322 arranged opposite to each other along the first direction X, and the adhesive 30 arranged in the first corner area 232 at least covers at least one of the first corner 2321 and the second corner 2322; the second corner area 233 includes a third corner 2331 and a fourth corner 2332 arranged opposite to each other along the first direction X, and the adhesive 30 arranged in the second corner area 233 at least covers at least one of the third corner 2331 and the fourth corner 2332, wherein the first direction X intersects with the winding direction of the electrode assembly 23.

[0070] For example, in one example, the adhesive 30 disposed in the first corner region 232 covers the first corner 2321 but does not cover the second corner 2322 , and the adhesive 30 disposed in the second corner region 233 covers the third corner 2331 but does not cover the fourth corner 2332 .

[0071] In another example, the adhesive 30 disposed in the first corner region 232 covers the second corner 2322 but does not cover the first corner 2321 , and the adhesive 30 disposed in the second corner region 233 covers the fourth corner 2332 but does not cover the third corner 2331 .

[0072] In another example, the adhesive 30 disposed in the first corner region 232 covers both the first corner 2321 and the second corner 2322 , and the adhesive 30 disposed in the second corner region 233 covers both the third corner 2331 and the fourth corner 2332 .

[0073] It should be noted that the specific corners covered by the adhesive 30 can be adjusted according to actual conditions, which will not be described in detail here.

[0074] In this way, an adhesive 30 is set in each corner area of ​​the electrode assembly 23, and the adhesive 30 covers at least at least one corner of a single corner area. Without affecting the function of the adhesive 30, the flexibility of use of the adhesive 30 is improved so that it can cover the corresponding corner as required.

[0075] For the convenience of explanation, the following embodiments are described by taking the adhesive member 30 disposed in the first corner area 232 as an example.

[0076] See also Figure 5Furthermore, in some embodiments, the adhesive 30 provided at the first corner 2321 includes a first section 31, a second section 32 and a third section 33, and the first section 31 and the third section 33 are connected at both ends of the second section 32. The first section 31 is located on the inner wall of the first corner 2321, and the third section 33 is located on the outer wall of the first corner 2321. The length of the first section 31 and the second section 32 along the first direction X is less than the length of the electrode assembly 23 along the first direction X.

[0077] like Figure 5 As shown, the adhesive member 30 has a U-shaped structure and is bonded to the outside of the first corner 2321 to limit the electrode piece located at the first corner 2321 and reduce the probability of increasing the gap between two adjacent electrode pieces. Because the length of the first section 31 and the second section 32 along the first direction X is less than the length of the electrode assembly 23 along the first direction X, the amount of adhesive member 30 used can be minimized without affecting the amount of adhesive member 30 used.

[0078] Furthermore, if Figure 4 As shown, each of the first corner 2321 and the second corner 2322 is provided with an adhesive member 30 , and the two adhesive members 30 are spaced apart along the first direction X.

[0079] Please also refer to Figure 5 The adhesive members 30 disposed at the first corner 2321 and the second corner 2322 have the same structure, and the structures of the two adhesive members 30 are similar to a U-shape. When an adhesive member 30 is disposed at each of the first corner 2321 and the second corner 2322, the two adhesive members 30 are spaced a distance apart.

[0080] In this way, compared with setting the adhesive member 30 as a ring member, the cost of the adhesive member 30 is saved, and the difficulty of installing the adhesive member 30 is reduced, making it easier to install the adhesive member 30.

[0081] like Figure 6 As shown, in some embodiments, the adhesive 30 extends from the inner wall of the first corner area 232 to the outer wall of the first corner area 232 and covers the first corner 2321 and the second corner 2322, wherein the adhesive 30 is provided with an opening, and the opening is provided on the inner wall and / or the outer wall.

[0082] For example, the adhesive member 30 has a C-shaped structure, with its opening located on the inner wall. This allows the adhesive member 30 to simultaneously cover both corners of a corner region, minimizing the amount of adhesive member 30 used while maximizing its effectiveness. Furthermore, because the adhesive member 30 is not closed, it is easier to install on the electrode assembly 23.

[0083] The structure of the adhesive member 30 is similar to a C-shape, and its opening is set on the outer wall. Its arrangement and beneficial effects are the same as those when the opening of the adhesive member 30 is located on the inner wall of the first corner area 232, and will not be repeated here.

[0084] Similarly, the adhesive member 30 disposed in the second corner region 233 may also be configured in a U-shape or a C-shape. The structure of the adhesive member 30 disposed in the first corner region 232 may be the same as or different from the structure of the adhesive member 30 disposed in the second corner region 233. For example, the adhesive member 30 disposed in the first corner region 232 may be U-shaped, while the adhesive member 30 disposed in the second corner region 233 may be C-shaped.

[0085] like Figure 8 and Figure 9 As shown, in some embodiments, the length of the adhesive member 30 along the second direction Y is a, where 0.1 mm < a < 0.2 mm. The second direction Y coincides with the winding direction of the electrode assembly 23. The specific value of a can be 0.1 mm, 0.13 mm, 0.2 mm, or any value between two adjacent values. The preferred length of the adhesive member 30 along the second direction Y is 0.18 mm.

[0086] For example, Figure 8 An electrode assembly 23 is shown equipped with a narrower wide adhesive 30 . Figure 9 The electrode assembly 23 is shown equipped with a wider width adhesive 30 .

[0087] In this way, the length of the adhesive 30 along the second direction Y can be adjusted according to the winding thickness of the electrode assembly 23, so that the obtained adhesive 30 can play a fastening role on the corner area of ​​the corresponding electrode assembly 23, reducing the probability that the corner area of ​​the electrode assembly 23 will become loose due to the insufficient length of the adhesive 30 along the second direction Y causing its fastening force to weaken.

[0088] In some embodiments, the thickness of the adhesive 30 is b, 10 μm < b < 50 μm. The specific value of b can be 10 μm, 20 μm, 30 μm, 50 μm, or any value between two adjacent values. The preferred thickness of the adhesive 30 is 20 μm.

[0089] This arrangement reduces the probability that the adhesive 30 will be perforated during use due to its thin thickness, causing the adhesive 30 to rupture and affect its performance, thereby improving the wear resistance and service life of the adhesive 30.

[0090] In some embodiments, the adhesive member 30 is configured as an elastic member.

[0091] When the adhesive 30 is pressed down and shaped together with the electrode assembly 23 , the adhesive 30 can maintain a certain strength while being deformed, so as to fasten the corner area of ​​the electrode assembly 23 .

[0092] In some embodiments, the adhesive member 30 is constructed as a plastic member. For example, the adhesive member 30 can be made of a single or composite polymer material such as polyethylene or polypropylene.

[0093] Such an arrangement reduces the difficulty of preparing the adhesive member 30 and makes it easier to obtain the adhesive member 30 .

[0094] In addition, some embodiments of the present application further provide a battery device 100, which includes the battery cell 20 in the above embodiment. Based on the same inventive concept, the battery device 100 also has all the beneficial effects of the above battery cell.

[0095] In one embodiment, a battery cell 20 includes an electrode assembly 23 and an adhesive 30. The electrode assembly 23 includes a straight region 231, a first corner region 232, and a second corner region 233. Each of the first and second corner regions 232 and 233 is provided with an adhesive 30. The adhesive 30 is constructed in a C-shape, extending from the inner wall of the corresponding corner region around the corner to the outer wall of the corner region.

[0096] Before being shaped, the electrode assembly 23 is wound into a cylindrical shape, and then pressed down to change its shape. During the pressing and shaping process, because the adhesive 30 is installed in the corner area similar to a headband, and the electrode assembly 23 is wound, the adhesive 30 can tighten the portion of the electrode assembly 23 located in the corner area, thereby maintaining a stable gap between the electrode pieces in the corner area. This reduces the probability that the retraction of the inner ring diaphragm of the electrode assembly 23 during the shaping process will drive the retraction of the electrode pieces, resulting in an increase in the gap between adjacent electrode pieces in the corner area.

[0097] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell, characterized in that: include: The electrode assembly includes a straight region and a first corner region and a second corner region connected to both ends of the straight region; Adhesives are arranged in the first corner area and the second corner area, at least one of the adhesives extends from the inner wall of the first corner area around the corner of the first corner area to the outer wall of the first corner area, and at least one of the adhesives extends from the inner wall of the second corner area around the corner of the second corner area to the outer wall of the second corner area.

2. The battery cell according to claim 1, wherein: The first corner region includes a first corner and a second corner disposed opposite to each other along a first direction, and the adhesive member disposed in the first corner region at least covers at least one of the first corner and the second corner; The second corner region includes a third corner and a fourth corner disposed opposite to each other along the first direction, and the adhesive member disposed in the second corner region at least covers at least one of the third corner and the fourth corner; Wherein, the first direction intersects with the winding direction of the electrode assembly.

3. The battery cell according to claim 2, characterized in that: The adhesive member arranged at the first corner includes a first section, a second section and a third section, the two ends of the second section are connected to the first section and the third section, the first section is located on the inner wall of the first corner, and the third section is located on the outer wall of the first corner, and the length of the first section and the second section along the first direction is less than the length of the electrode assembly along the first direction.

4. The battery cell according to claim 3, characterized in that The first corner and the second corner are each provided with an adhesive component, and the two adhesive components are spaced apart along the first direction.

5. The battery cell according to claim 2, characterized in that: The adhesive extends from the inner wall of the first corner area to the outer wall of the first corner area and covers the first corner and the second corner, wherein the adhesive is provided with an opening, and the opening is provided on the inner wall and / or the outer wall.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The length of the adhesive along the second direction is a, 0.1 mm < a < 0.2 mm, wherein the second direction is consistent with the winding direction of the electrode assembly.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The thickness of the adhesive member is b, 10 μm<b<50 μm.

8. The battery cell according to any one of claims 1 to 5, characterized in that: The adhesive element is configured as an elastic element.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The adhesive component is configured as a plastic component.

10. A battery device, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 9.

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