Battery cell, battery and electric device

Abstract

The utility model discloses a battery cell, a battery and a power utilization device. The battery cell comprises a first insulating layer and a pole core, the pole core comprises a pole core body and a pole lug connected with the pole core body; a connecting area and a blank area except the connecting area are arranged on the surface of one side of the tab, and the connecting area is used for being electrically connected with a shell of a battery cell; the first insulating layer is arranged in at least part of the blank area and arranged in at least part of the circumferential direction of the connecting area, and the connecting area is exposed out of the first insulating layer. Therefore, the mechanical stress borne by the tab can be partially transferred to the first insulating layer by utilizing the first insulating layer when the tab is bent, the stress concentration of the tab material can be relieved by the stress dispersion mechanism, and the risk of tab breakage is reduced. In addition, the first insulating layer can limit the outward turning amplitude of the fracture part and reduce the risk that the tab is warped to be in contact with the shell, so that the risk of short circuit in the battery cell is reduced.

Description

Technical Field

[0001] This application belongs to the field of battery technology, specifically relating to a battery cell, a battery, and an electrical device. Background Technology

[0002] A battery cell is a device that converts chemical energy into electrical energy and stores it inside, so as to power external devices when needed.

[0003] A battery cell includes an electrode assembly. The electrode assembly has tabs attached to it. In related technologies, these tabs are prone to brittle fracture when subjected to mechanical stress during bending. The fractured tabs warp outwards, potentially causing a short circuit within the battery cell. Utility Model Content

[0004] This application aims to provide a battery cell, battery, and electrical device that can solve the problem of brittle fracture when the tabs are bent and subjected to mechanical stress.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a battery cell, including a first insulating layer and an electrode core, the electrode core including an electrode core body and an electrode tab connected to the electrode core body; one side surface of the electrode tab is provided with a connection area and a blank area other than the connection area, the connection area being used for electrical connection with the battery cell housing; the first insulating layer is disposed in at least a portion of the blank area, the first insulating layer is disposed in at least a portion of the connection area circumferentially, and the connection area is exposed outside the first insulating layer.

[0007] Optionally, the first insulating layer at least partially covers the connection between the tab and the core body; and / or, the surface of the core body is provided with an insulating film, the height of the insulating film along a first direction is greater than or equal to the height of the core body, the first direction being the height direction of the core, and the first insulating layer at least partially disposed on the side of the insulating film opposite to the core body.

[0008] Optionally, the first insulating layer includes a transparent portion and a non-transparent portion; the transparent portion is located in the blank area and / or at the connection between the tab and the electrode core body; the non-transparent portion is disposed on the electrode core body and is located on the side of the connection away from the tab.

[0009] Optionally, the height direction of the electrode core is a first direction, and the height of the non-transparent part along the first direction is H, satisfying: 5mm≤H1≤19mm; and / or, the transparent part is provided at the connection between the electrode tab and the electrode core body, and the height of the transparent part located on the electrode core body along the first direction is H2, satisfying: 1mm≤H2≤15mm.

[0010] Optionally, the height direction of the electrode core is a first direction, and the first insulating layer includes a first portion of the insulating layer located on one side of the connection region along the first direction; and / or, the height direction of the electrode core is a first direction, and the first insulating layer includes a second portion of the insulating layer located on the other side of the connection region along the first direction; and / or, the length direction of the electrode core is a second direction, and the first insulating layer includes a third portion of the insulating layer located on one side of the connection region along the second direction; and / or, the length direction of the electrode core is a second direction, and the insulating layer includes a fourth portion of the insulating layer located on the other side of the connection region along the second direction.

[0011] Optionally, the first insulating layer includes a first portion insulating layer located on one side of the connection area along the first direction, and a third portion insulating layer and a fourth portion insulating layer located on opposite sides of the connection area along the second direction, wherein the first portion insulating layer, the third portion insulating layer, and the fourth portion insulating layer are an integral structure or a separate structure; and / or, along the second direction, the edge of the first insulating layer extends beyond the edge of the tab; and / or, there is a gap between the first insulating layer and the connection area; and / or, the side of the first insulating layer facing the tab is adhesive; and / or, the first insulating layer is elastic; and / or, the first insulating layer includes insulating tape.

[0012] Optionally, the length direction of the electrode core is the second direction; the maximum length of the electrode tab along the second direction is A, and the length of the insulating layer along the second direction is A1, satisfying: 0mm≤A1-A≤10mm; and / or, the length direction of the electrode core is the second direction, the insulating layer includes a third part insulating layer and a fourth part insulating layer located on opposite sides of the connection area along the second direction, the length of the connection area along the second direction is B, and the distance between the third part insulating layer and the fourth part insulating layer along the second direction is B1, satisfying: 2mm≤B1-B≤7mm.

[0013] Optionally, it further includes a second insulating layer; the tab has another side surface disposed opposite to the first side surface, and the second insulating layer is provided on the other side surface.

[0014] Optionally, the first insulating layer and the second insulating layer are either an integral structure or separate structures.

[0015] Optionally, the electrode tab includes a plurality of sub-electrodes; the thickness direction of the electrode core is a third direction, the plurality of sub-electrodes are stacked along the third direction, the plurality of sub-electrodes are electrically connected to the electrode core body respectively, adjacent sub-electrodes are electrically connected to form an electrical connection portion, and at least one sub-electrode has a first insulating layer on one or both surfaces on which the electrical connection portion is formed.

[0016] Optionally, it also includes a housing; the electrode core is disposed inside the housing, and one side surface of the electrode tab faces one side of the housing.

[0017] Secondly, embodiments of this application propose a battery including the battery cell described in the above embodiments.

[0018] Thirdly, embodiments of this application provide an electrical device including the battery described in the above embodiments.

[0019] In embodiments of this application, a connection area and a blank area (excluding the connection area) are provided on one side surface of the tab. The connection area is electrically connected to the battery cell casing. A first insulating layer is provided in the blank area along at least a portion of the circumference of the connection area. The first insulating layer is provided in at least a portion of the blank area and in at least a portion of the circumference of the connection area, with the connection area exposed above the first insulating layer. This allows the first insulating layer to partially transfer the mechanical stress borne by the tab when it is bent. This stress dispersion mechanism alleviates stress concentration in the tab material itself, reducing the risk of tab breakage. Furthermore, the first insulating layer limits the outward bending of the fracture site, reducing the risk of the tab warping into contact with the casing, thereby reducing the risk of internal short circuits within the battery cell.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram showing that the electrode core is not provided with a first insulating layer according to an embodiment of this application;

[0023] Figure 2 This is a schematic diagram of a first type of electrode core according to an embodiment of this application;

[0024] Figure 3 This is a schematic diagram of a second type of electrode core according to an embodiment of this application;

[0025] Figure 4 This is a schematic diagram of a third type of electrode core according to an embodiment of this application;

[0026] Figure 5 This is a schematic diagram of a fourth type of electrode core according to an embodiment of this application;

[0027] Figure 6 This is a partial cross-sectional view of the electrode core according to an embodiment of this application;

[0028] Figure 7 This is a cross-sectional view of the electrode core according to an embodiment of this application;

[0029] Figure 8 This is a diagram showing the positional relationship between the insulating layer and the tabs according to an embodiment of this application;

[0030] Figure 9 This is a schematic diagram of the structure of the first insulating layer according to an embodiment of this application;

[0031] Figure 10 This is a schematic diagram of the structure of the second type of first insulating layer according to an embodiment of this application;

[0032] Figure 11 This is a schematic diagram of the structure of the third type of first insulating layer according to an embodiment of this application;

[0033] Figure 12 This is a schematic diagram of the structure of the fourth type of first insulating layer according to an embodiment of this application.

[0034] Figure label:

[0035] 10-Electrode core; 11-Electrode core body; 111-Separating membrane; 112-Positive electrode sheet; 113-Negative electrode sheet; 12-Electrode tab; 121-Sub-electrode tab; 13-Connection area; 14-Blank area; 20-First insulating layer; 201-First partial insulating layer; 202-Second partial insulating layer; 203-Third partial insulating layer; 204-Fourth partial insulating layer; 21-Transparent part; 22-Non-transparent part; 23-Second insulating layer; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0036] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] The terms "positive" and "negative" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] In the description of this application, it should be understood that the 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., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing 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, and therefore should not be construed as a limitation of this application.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Before explaining the battery cell, battery, and power device provided in the embodiments of this application, we will first describe in detail the application scenario of one embodiment of the battery cell:

[0041] A battery cell is a device that converts chemical energy into electrical energy and stores it internally to power external devices when needed. A battery cell includes a housing and an electrode assembly. In one application scenario, the housing includes a top cover and an aluminum shell. In one embodiment, tabs are connected to the electrode assembly and are electrically connected to the top cover. In another embodiment, the top cover has terminals that are welded to the tabs to form the positive and negative electrodes of the battery cell. In the battery cell assembly process, the welding quality of the terminals and tabs directly affects the reliability of the battery cell structure.

[0042] In related technologies, due to limitations in the tab-terminal welding process, the unwelded parts of the tab are prone to brittle fracture when subjected to mechanical stress during the core assembly process. The fractured tab warps outward, and when the warped tab comes into contact with the conductive casing (e.g., an aluminum casing), it poses a risk of internal short circuit within the battery cell.

[0043] The electrode core, battery cell, battery, and power-consuming device provided in this application will be described in detail below with reference to the accompanying drawings and through specific embodiments and application scenarios.

[0044] like Figure 1 and Figure 2As shown, this application embodiment proposes a battery cell, including a first insulating layer 20 and an electrode core 10; the electrode core 10 includes an electrode core body 11 and an electrode tab 12 connected to the electrode core body 11; one side surface of the electrode tab 12 is provided with a connection area 13 and a blank area 14 other than the connection area 13, the connection area 13 is used for electrical connection with the battery cell housing; the first insulating layer 20 is disposed in at least part of the blank area 14, the first insulating layer 20 is disposed in at least part of the circumferential direction of the connection area 13, and the connection area 13 is exposed outside the first insulating layer 20.

[0045] In the embodiments of this application, a connection area 13 and a blank area 14 other than the connection area 13 are provided on one side surface of the tab 12. The connection area 13 is electrically connected to the casing of the battery cell. A first insulating layer 20 is provided in at least a portion of the blank area 14 and in at least a portion of the circumferential direction of the connection area 13, with the connection area 13 exposed above the first insulating layer 20. Thus, the first insulating layer 20 can transfer part of the mechanical stress borne by the tab 12 to the first insulating layer 20 when the tab 12 is bent. This stress dispersion mechanism can alleviate stress concentration in the tab 12 material itself and reduce the risk of tab 12 breakage. Furthermore, the first insulating layer 20 can limit the outward bending amplitude of the fracture site, reducing the risk of the tab 12 warping into contact with the casing, thereby reducing the risk of internal short circuits within the battery cell.

[0046] In some embodiments, the first insulating layer 20 has adhesive properties, which allows the first insulating layer 20 to be connected to the tab 12. Due to the adhesive properties of the first insulating layer 20 itself, broken tab fragments can be adhered to the first insulating layer 20, reducing the risk of tab fragments migrating into the cell and causing a short circuit.

[0047] In some embodiments, the first insulating layer 20 may also be elastic. The elasticity of the first insulating layer 20 can absorb and alleviate stress, reducing the stress borne by the tab 12.

[0048] In some embodiments, the first insulating layer 20 of this application can be applied to a conventionally configured battery, i.e., the battery includes a casing, in which a positive terminal and a negative terminal are provided, and the tab 12 includes a positive tab and a negative tab, with the connection area 13 of the positive tab connected to the positive terminal and the connection area 13 of the negative tab connected to the negative terminal; of course, the first insulating layer 20 of this application can be applied to a battery without a negative terminal. For those skilled in the art, the choice can be made according to actual needs, and the embodiments of this application are not limited here.

[0049] In some embodiments, such as Figure 1 and Figure 2 As shown, the first insulating layer 20 at least partially covers the connection between the tab 12 and the core body 11.

[0050] Understandably, the connection between the tab 12 and the core body 11 is the area where mechanical stress is most concentrated during bending, and it is also the weakest point most prone to fracture. By covering at least part of the connection between the tab 12 and the core body 11 with the first insulating layer 20, the stress at this point can be absorbed by the first insulating layer 20, reducing the risk of brittle fracture caused by local stress concentration.

[0051] It should be noted that the connection between the tab 12 and the core body 11 includes a portion of the tab 12 and a portion of the core body 11. The first insulating layer 20 extends onto the core body 11 to cover the connection between the tab 12 and the core body 11.

[0052] In some embodiments, such as Figure 6 and Figure 7 As shown, the surface of the electrode core body 11 is provided with an isolation film 111. The height of the isolation film 111 along the first direction X is greater than or equal to the height of the electrode core body 11. The first direction X is the height direction of the electrode core 10. The first insulating layer 20 is at least partially disposed on the side of the isolation film 111 away from the electrode core body 11.

[0053] It is understandable that by placing the first insulating layer 20 on the insulating membrane 111, the insulating membrane 111 and the outer first insulating layer 20 together wrap around the electrode core body 11. When the electrode tab 12 is bent, the outer first insulating layer 20 absorbs mechanical stress through elastic deformation, while the insulating membrane 111 disperses stress through its own extensibility to provide a composite buffer, reducing the stress peak transmitted to the connection point of the electrode tab 12.

[0054] Furthermore, since the outermost part of the electrode core 10 can also be configured as an electrode sheet, the first insulating layer 20 can be disposed on the electrode sheet. In this way, the electrode sheet can be directly insulated and protected, preventing short circuits between the electrode sheet and other components, and improving the safety and stability of the battery.

[0055] Specifically, such as Figure 6 As shown, the electrode core body 11 includes a positive electrode 112, a negative electrode 113, and a separator 111. The positive electrode 112 and the negative electrode 113 are stacked. The outermost electrode core body 11 is also provided with a separator 111. The outermost separator 111 not only provides a bonding position for the first insulating layer 20, but also forms an edge insulating layer on the outer side of the electrode core body 11 to insulate the electrode core body.

[0056] In one embodiment, such as Figure 3 As shown, the first insulating layer 20 includes a transparent portion 21 and a non-transparent portion 22; the transparent portion 21 is located in the blank area 14 and / or at the connection between the tab 12 and the core body 11; the non-transparent portion 22 is provided on the core body 11 and is located on the side of the connection away from the tab 12.

[0057] It is understandable that by placing the transparent portion 21 on the blank area 14 or extending the transparent portion 21 to cover the electrode core body 11 and the connection between the electrode tab 12 and the electrode core body 11, the welding quality at the connection, the bending angle of the electrode tab 12, or the fit between the first insulating layer 20 and the electrode tab 12 can be directly observed through optical inspection equipment, thereby improving the defect detection rate in the production process.

[0058] Furthermore, by providing the non-transparent portion 22 on the electrode core body 11 and located on the side away from the electrode tab 12 at the connection point, it is easier to cooperate with the color sensor to detect whether the first insulating layer 20 is attached to the isolation film 111, thereby improving the defect detection rate in the production process.

[0059] It should be noted that transparency refers to an object or a part of an object allowing light to pass through, so that the object or scene on the other side can be clearly seen from one side. In this embodiment, the transparent portion 21 of the first insulating layer 20 refers to the portion through which light can pass to see the blank area 14, the tab 12, and the connection point of the electrode core body 11. Conversely, opacity refers to an object or a part of an object that does not allow light to pass through, thus making it impossible to clearly see the object or scene on the other side. In this embodiment, the opaque portion 22 of the first insulating layer 20 refers to the portion through which light cannot pass to see the electrode core body 11.

[0060] Specifically, the non-transparent part 22 refers to the first insulating layer 20 of this part having color. The color sensor is a sensor that can detect and identify color. The working principle of the color sensor is as follows: when the first insulating layer 20 is attached to the isolation film 111, the color sensor can identify the color of the first insulating layer 20, thereby determining that the first insulating layer 20 is attached to the outermost isolation film 111; when the first insulating layer 20 is not attached to the isolation film 111, the color sensor cannot identify the color of the first insulating layer 20, thereby determining that the first insulating layer 20 is not attached to the outermost isolation film 111.

[0061] In some embodiments, such as Figure 6 As shown, when the height of the outermost insulating film 111 is greater than or equal to the height of the electrode core body 11, the first insulating layer 20 needs to extend downward and beyond the upper edge of the electrode core body 11. In this way, part of the transparent portion 21 covers the insulating film 111 and part of the transparent portion 21 covers the blank area 14. When the height of the outermost insulating film 111 is less than the height of the electrode core body 11, the first insulating layer 20 also needs to extend downward and beyond the upper edge of the electrode core body 11, and the extension length is greater than the above case. In this way, the transparent portion 21 can be completely set on the tab 12, and only the non-transparent portion 22 needs to be covered on the insulating film 111.

[0062] In some embodiments, such as Figure 3As shown, the height direction of the core 10 is the first direction X, and the height of the non-transparent part 22 along the first direction X is H1, which satisfies: 5mm≤H1≤19mm.

[0063] In this embodiment, the height H1 of the non-transparent portion 22 along the first direction X is set within a certain range. This allows the non-transparent portion 22 of a certain size to cover the core body 11, which helps to effectively connect the non-transparent portion 22 to the core body 11 and controls the cost of the size of the non-transparent portion 22.

[0064] For example, the value of H1 can be set to any value among 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, and 19mm, as well as a range between any two values.

[0065] In some embodiments, such as Figure 3 As shown, a transparent part 21 is provided at the connection between the tab 12 and the core body 11. The height of the transparent part 21 on the core body 11 along the first direction X is H2, which satisfies: 1mm≤H2≤15mm.

[0066] It is understandable that the height H2 of the transparent portion 21 located on the core body 11 is set within a certain range. This allows the optical inspection equipment to effectively and directly observe the welding quality at the connection point by covering the core body 11 with a transparent portion 21 of a certain size, while also controlling the cost of the size of the transparent portion 21.

[0067] For example, the value of H2 can be set to any value among 1mm, 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, and 15mm, as well as a range between any two values.

[0068] In some embodiments, such as Figure 4 As shown, the height direction of the electrode core 10 is the first direction X, and the first insulating layer 20 includes a first portion of insulating layer 201 located on one side of the connection region 13 along the first direction X.

[0069] It is understandable that the first insulating layer 201 is disposed on the side of the connection area 13 along the first direction X. This allows for flexible arrangement of the first insulating layer 20 to meet the protection requirements of the tab 12 along the first direction X.

[0070] In some embodiments, such as Figure 4 As shown, the height direction of the electrode core 10 is the first direction X, and the first insulating layer 20 includes a second insulating layer 202 located on the other side of the connection area 13 along the first direction X.

[0071] It is understood that by providing the second insulating layer 202 on the other side of the connection area 13 along the first direction X, it is possible to work in conjunction with the first insulating layer 201 to absorb compressive / tensile stress during cell stacking or under pressure along the first direction X, thus preventing the base of the tab 12 from breaking due to longitudinal deformation.

[0072] In some embodiments, such as Figure 4 As shown, the length direction of the pole core 10 is the second direction Y, and the first insulating layer 20 includes a third insulating layer 203 located on the side of the connection region 13 along the second direction Y.

[0073] It is understandable that the third insulating layer 203 is disposed on one side of the connection area 13 along the second direction Y. This allows for flexible arrangement of the first insulating layer 20 to meet the protection requirements of the tab 12 along the second direction Y.

[0074] In some embodiments, such as Figure 4 As shown, the length direction of the pole core 10 is the second direction Y, and the insulating layer includes a fourth portion of the insulating layer 204 located on the other side of the second direction Y in the connection region 13.

[0075] Understandably, by placing the fourth insulating layer 204 on the other side of the connection area 13 along the second direction Y, it is possible to form a symmetrical constraint with the third insulating layer 203 when the tab 12 is laterally bent or subjected to vibration shear force, thus suppressing crack propagation caused by lateral torsion.

[0076] In some embodiments, such as Figure 2 and Figure 4 As shown, the first insulating layer 20 includes a first insulating layer 201 located on one side of the connection region 13 along the first direction X, and a third insulating layer 203 and a fourth insulating layer 204 located on opposite sides of the connection region 13 along the second direction Y. The first insulating layer 201, the third insulating layer 203 and the fourth insulating layer 204 are either an integral structure or a separate structure.

[0077] In some embodiments, such as Figure 2 As shown, the first insulating layer 201, the third insulating layer 203, and the fourth insulating layer 204 are made into an integral structure. This eliminates the weak interface area at the joint of the split structure and prevents cracks from propagating along the joint. At the same time, the integral molding process can achieve a gradient change in the thickness of the first insulating layer 20, which specifically improves fatigue resistance.

[0078] In some embodiments, the first insulating layer 20 can be manufactured using a molding process or a three-dimensional (3D) printing process. During manufacturing, different thicknesses can be applied to different portions of the first insulating layer 20. For example, the first insulating layer 20 may have a larger thickness at the junction with the tab 12 and the core body 11, and a smaller thickness in the remaining portions. This improves the fatigue resistance at the junction of the tab 12 and the core body 11.

[0079] In addition, such as Figure 4 As shown, the first insulating layer 201, the third insulating layer 203, and the fourth insulating layer 204 are configured as separate structures. This allows the first insulating layer 20 in different directions to use different materials, thereby specifically improving the strength of the tab 12. Simultaneously, the separate design allows for independent replacement of different parts of the insulating layer 20 when it is damaged, reducing maintenance costs.

[0080] In some embodiments, such as Figure 4 As shown, the tab 12 has an axisymmetric structure, and the second insulating layer 202 and the third insulating layer 203 can be arranged symmetrically along the axis of symmetry of the tab 12. Of course, as... Figure 5 As shown, the second insulating layer 202 and the third insulating layer 203 can also be arranged non-axially symmetrically. Those skilled in the art can choose according to actual needs, and this application embodiment does not impose any limitations.

[0081] In some embodiments, such as Figure 4 As shown, along the second direction Y, the edge of the first insulating layer 20 extends beyond the edge of the tab 12.

[0082] In this embodiment, the edge of the first insulating layer 20 extends beyond the edge of the tab 12. Thus, when the tab 12 breaks and flips outward, the first insulating layer 20 extending beyond the edge of the tab 12 can cover a wider warping path, forming an "extended protection zone." Even if the break point is near the end of the tab 12 or the warping is significant, the extended first insulating layer 20 can still help prevent direct contact between the tab 12 and adjacent conductors, reducing the risk of edge short circuits.

[0083] In some embodiments, such as Figure 4 and Figure 5 As shown, the dimensions of the two sides of the first insulating layer 20 along the second direction Y that extend beyond the edge of the tab 12 may be equal or unequal. Those skilled in the art can choose according to actual needs, and this application embodiment does not impose any restrictions.

[0084] In some embodiments, such as Figure 2As shown, there is a gap between the first insulating layer 20 and the connection area 13.

[0085] In this embodiment, a gap is provided between the first insulating layer 20 and the connection area 13. This gap provides tolerance space for the connection between the tab 12 and the housing. Furthermore, during charging and discharging of the battery cell, the connection area 13 generates heat due to the current flow. The difference in thermal expansion coefficients between the metal tab 12 and the first insulating layer 20 may cause interfacial stress. The gap provides thermal deformation compensation space for both, reducing the risk of the first insulating layer 20 cracking or peeling off from the tab 12 due to expansion and compression.

[0086] In some embodiments, such as Figure 4 As shown, the gaps between the first insulating layer 201, the second insulating layer 202, the third insulating layer 203, and the fourth insulating layer 204 and the connection area 13 may be equal or unequal. Those skilled in the art can choose according to actual needs, and the embodiments of this application do not impose any limitations here.

[0087] In some embodiments, the first insulating layer 20 includes insulating adhesive paper.

[0088] In this embodiment, the first insulating layer 20 is made of insulating adhesive paper. This allows the soft properties of the insulating adhesive paper to be used to precisely adhere to the surface of the tab 12, the connection between the tab 12 and the core body 11, and the bent separator 111.

[0089] In some embodiments, the insulating tape includes an insulating layer and an adhesive layer disposed on one side of the insulating layer. The insulating layer may be made of polyimide (PI) or polyethylene terephthalate (PET), and the adhesive layer may be made of polymethyl methacrylate (PMMA).

[0090] In some embodiments, such as Figures 8 to 12 As shown, the insulating tape can be designed as a U-shaped adhesive with an open structure. The projection shape of the open structure onto the third direction Z can be as follows: Figure 9 rectangle, such as Figure 10 oval, such as Figure 11 trapezoids and such Figure 11 The combination of straight lines and curves can be selected by those skilled in the art according to actual needs, and the embodiments of this application are not limited herein.

[0091] In some embodiments, such as Figure 8As shown, the length direction of the electrode core 10 is the second direction Y; the maximum length of the electrode tab 12 along the second direction Y is A, and the length of the first insulating layer 20 along the second direction Y is A1, satisfying: 0mm≤A1-A≤10mm.

[0092] It is understandable that the difference between the maximum length A of the tab 12 along the second direction Y and the length A1 of the insulation layer along the second direction Y is set within a certain range. This allows for precise control of the material usage of the first insulation layer 20, balancing cost and protective performance.

[0093] For example, the value of A1-A can be set to any value among 0mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, and 10mm, as well as the range between any two values.

[0094] In some embodiments, the length direction of the core 10 is the second direction Y, and the first insulating layer 20 includes a third insulating layer 203 and a fourth insulating layer 204 located on opposite sides of the connection region 13 along the second direction Y. The length of the connection region 13 along the second direction Y is B, and the distance between the third insulating layer 203 and the fourth insulating layer 204 along the second direction Y is B1, satisfying: 2mm≤B1-B≤7mm.

[0095] It is understandable that by setting the difference between the spacing B1 of the third insulating layer 203 and the fourth insulating layer 204 along the second direction Y and the length B of the connection area 13 along the second direction Y within a certain range, a tolerance is provided for process variations in the length B of the connection area 13. This ensures that even if the actual value of B is slightly larger than the design value, the first insulating layer 20 can still effectively cover the edge of the connection area 13, thereby improving the protective effect.

[0096] In addition, by setting the spacing B1 of the first insulating layer 20 to be greater than the length B of the connection area 13, an elastic buffer zone is formed on both sides of the connection area 13. When the tab 12 is bent, the free space within the spacing of the first insulating layer 20 allows the metal in the connection area 13 to undergo controllable deformation, avoiding stress concentration caused by rigid constraints. At the same time, the first insulating layer 20 on both sides absorbs energy through elastic rebound, reducing the risk of breakage.

[0097] For example, the value of B1-B can be set to any value among 2mm, 3mm, 4mm, 5mm, 6mm, and 7mm, as well as the range between any two values.

[0098] In some embodiments, such as Figure 6 and Figure 7 As shown, the battery cell also includes a second insulating layer 23; the tab 12 has another side surface disposed opposite to one side surface, and the other side surface is provided with the second insulating layer 23.

[0099] Understandably, the first insulating layer 20 and the second insulating layer 23 cover both sides of the tab 12 respectively. This forms a fully enclosed insulating barrier, eliminating the risk of metal exposure on either side of the tab 12 due to breakage, warping, or vibration friction, and completely blocking the bidirectional short circuit path.

[0100] In some embodiments, the first insulating layer 20 and the second insulating layer 23 may also be attached to the periphery of the tab 12 to protect the periphery of the tab 12. That is, the periphery of the tab 12 is bound by the first insulating layer 20 and the second insulating layer 23. Even if the tab 12 breaks, it can still be bound by the first insulating layer 20 and the second insulating layer 23, reducing the risk of the broken tab 12 falling or migrating to other parts and causing a short circuit.

[0101] In some embodiments, the first insulating layer 20 and the second insulating layer 23 are an integral structure or separate structures.

[0102] In this embodiment, the first insulating layer 20 and the second insulating layer 23 are integrated into a single structure. This allows the integrated insulating layer to uniformly transfer stress through material continuity when the tab 12 is bent, suppressing sudden changes in local strain and reducing tearing caused by asymmetric deformation. Furthermore, the integrated structure can be formed in one step using processes such as injection molding and hot pressing, reducing the alignment and bonding steps required for separate structures and making it suitable for high-speed automated production.

[0103] In addition, by setting the first insulating layer 20 and the second insulating layer 23 as separate structures, it is easier to attach the first insulating layer 20 and the second insulating layer 23 to the tab 12, making the application convenient.

[0104] In some embodiments, such as Figure 6 and Figure 7 As shown, the electrode tab 12 includes a plurality of sub-electrodes 121; the thickness direction of the electrode core 10 is the third direction Z, the plurality of sub-electrodes 121 are stacked along the third direction Z, the plurality of sub-electrodes 121 are electrically connected to the electrode core body 11 respectively, adjacent sub-electrodes 121 are electrically connected to form an electrical connection portion, and at least one sub-electrode 121 has a first insulating layer 20 on one or both sides of the surface where the electrical connection portion is formed.

[0105] It is understandable that by stacking multiple sub-tabs 121 along the third direction Z, the multiple sub-tabs 121 are electrically connected to the electrode core body 11 respectively, and adjacent sub-tabs 121 are electrically connected to form an electrical connection portion. At least one sub-tab 121 has a first insulating layer 20 on one or both sides of the surface where the electrical connection portion is formed. Since the electrical connection portion of adjacent sub-tabs 121 is prone to deformation when bent, causing metal burrs or welding slag to fall off, covering the side of the electrical connection portion with the first insulating layer 20 helps to prevent metal burrs or welding slag from contacting adjacent sub-tabs 121 or the shell, reducing the risk of interlayer micro short circuits.

[0106] Additionally, in some embodiments, if one side surface of the tab 12 is the side closest to the housing (e.g., aluminum housing), then the side surface of the outermost two sub-tabs 121 that is closest to the housing is one side surface of the tab 12.

[0107] In some embodiments, the sub-tab 121 includes a positive sub-tab and a negative sub-tab, and the tab 12 includes a positive tab and a negative tab; after the positive electrode 112, the separator 111, and the negative electrode 113 are alternately arranged, the positive sub-tabs of each positive electrode 112 are ultrasonically pre-welded at the electrical connection portion to form a positive tab, and the negative sub-tabs of each negative electrode 113 are ultrasonically pre-welded at the electrical connection portion to form a negative tab.

[0108] In some embodiments, the device further includes a housing, with the electrode core 10 disposed within the housing and one side surface of the electrode tab 12 facing one side of the housing.

[0109] In the embodiments of this application, the electrode core 10 is disposed inside the housing, with one side surface of the electrode tab 12 facing the housing. This allows the first insulating layer 20 to insulate the electrode tab surface near the housing, preventing the electrode tab 12 from warping and contacting the housing, which could lead to a short circuit inside the battery cell.

[0110] In some embodiments, a battery is also proposed, comprising the cell described in the above embodiments.

[0111] In the embodiments of this application, a connection area 13 and a blank area 14 other than the connection area 13 are provided on one side surface of the tab 12. The connection area 13 is electrically connected to the battery cell housing. A first insulating layer 20 is provided in at least a portion of the blank area 14 and in at least a portion of the circumferential direction of the connection area 13, with the connection area 13 exposed above the first insulating layer 20. Thus, the first insulating layer 20 can transfer part of the mechanical stress borne by the tab 12 to the first insulating layer 20 when the tab 12 is bent. This stress dispersion mechanism can alleviate stress concentration in the tab 12 material itself and prevent breakage. Furthermore, due to the adhesiveness of the first insulating layer 20, even if the tab 12 breaks, the first insulating layer 20 can limit the outward bending of the broken part, preventing the tab 12 from warping to a critical angle of contact with the housing, thereby avoiding internal short circuits in the battery cell.

[0112] It should be noted that the electrode core 10 of this application can be applied to square aluminum-cased batteries, soft-pack batteries, cylindrical batteries, etc. For those skilled in the art, they can choose according to actual needs, and the embodiments of this application are not limited here.

[0113] In some embodiments, an electrical device is also provided, including the battery in the above embodiments.

[0114] In the embodiments of this application, a connection area 13 and a blank area 14 other than the connection area 13 are provided on one side surface of the tab 12. The connection area 13 is electrically connected to the casing of the battery cell. A first insulating layer 20 is provided in at least a portion of the blank area 14 and in at least a portion of the circumferential direction of the connection area 13, with the connection area 13 exposed above the first insulating layer 20. Thus, the first insulating layer 20 can transfer part of the mechanical stress borne by the tab 12 to the first insulating layer 20 when the tab 12 is bent. This stress dispersion mechanism can alleviate stress concentration in the tab 12 material itself and prevent breakage. Furthermore, due to the adhesiveness of the first insulating layer 20, even if the tab 12 breaks, the first insulating layer 20 can limit the outward bending of the broken part, preventing the tab 12 from warping to a critical angle of contact with the conductive casing, thereby avoiding a short circuit inside the battery cell.

[0115] In specific applications, electrical equipment can include laptops, pen-based computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, bicycles, ships, spacecraft, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.

[0116] Specifically, the vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.

[0117] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0118] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An electric cell, characterized by, The first insulating layer (20) and the pole core (10) are included. The pole core (10) includes a pole core body (11) and a tab (12) connected to the pole core body (11). One side surface of the tab (12) is provided with a connection area (13) and a blank area (14) other than the connection area (13), and the connection area (13) is used for electrical connection with the shell of the battery cell. The first insulating layer (20) is arranged at least partially in the blank area (14), and the first insulating layer (20) is arranged at least partially in the circumferential direction of the connection area (13), and the connection area (13) is exposed to the first insulating layer (20).

2. The electric cell of claim 1, wherein, The first insulating layer (20) at least partially covers the connection between the tab (12) and the pole core body (11). And / or, the surface of the pole core body (11) is provided with an isolation film (111), the height of the isolation film (111) in the first direction (X) is greater than or equal to the height of the pole core body (11), the first direction (X) is the height direction of the pole core (10), and the first insulating layer (20) is at least partially arranged on the side of the isolation film (111) away from the pole core body (11).

3. The cell of claim 1 or 2, wherein, The first insulating layer (20) includes a transparent part (21) and a non-transparent part (22). The transparent part (21) is located at the blank area (14) and / or the connection between the tab (12) and the pole core body (11). The non-transparent part (22) is arranged on the pole core body (11) and located on the side of the connection away from the tab (12).

4. The electric cell of claim 3, wherein, The height direction of the pole core (10) is the first direction (X), the height of the non-transparent part (22) in the first direction (X) is H1, and 5mm≤H1≤19mm is satisfied. And / or, the connection between the tab (12) and the pole core body (11) is provided with the transparent part (21), and the height of the transparent part (21) on the pole core body (11) in the first direction (X) is H2, and 1mm≤H2≤15mm is satisfied.

5. The cell of claim 1 or 2, wherein, The height direction of the pole core (10) is the first direction (X), and the first insulating layer (20) includes a first partial insulating layer (201) located on one side of the connection area (13) in the first direction (X). And / or, the height direction of the pole core (10) is the first direction (X), and the first insulating layer (20) includes a second partial insulating layer (202) located on the other side of the connection area (13) in the first direction (X). And / or, the length direction of the pole core (10) is the second direction (Y), and the first insulating layer (20) includes a third partial insulating layer (203) located on one side of the connection area (13) in the second direction (Y). And / or, the length direction of the pole core (10) is the second direction (Y), and the insulating layer (20) includes a fourth partial insulating layer (204) located on the other side of the connection area (13) in the second direction (Y).

6. The electric cell of claim 5, wherein, The first insulating layer (20) includes a first partial insulating layer (201) located on one side of the connecting area (13) along the first direction (X), and a third partial insulating layer (203) and a fourth partial insulating layer (204) located on opposite sides of the connecting area (13) along the second direction (Y), the first partial insulating layer (201), the third partial insulating layer (203) and the fourth partial insulating layer (204) being an integral structure or a separate structure; And / or, along the second direction (Y), the edge of the first insulating layer (20) exceeds the edge of the tab (12); And / or, the first insulating layer (20) has a gap with the connecting area (13); And / or, the side of the first insulating layer (20) towards the tab (12) has adhesion; And / or, the first insulating layer (20) has elasticity; And / or, the first insulating layer (20) includes insulating adhesive paper.

7. The cell of claim 1 or 2, wherein, The length direction of the pole core (10) is the second direction (Y); the maximum length of the tab (12) along the second direction (Y) is A, and the length of the first insulating layer (20) along the second direction (Y) is A1, satisfying: 0mm≤A1-A≤10mm; And / or, the length direction of the pole core (10) is the second direction (Y), and the first insulating layer (20) includes a third partial insulating layer (203) and a fourth partial insulating layer (204) located on opposite sides of the connecting area (13) along the second direction (Y), the length of the connecting area (13) along the second direction (Y) is B, and the distance between the third partial insulating layer (203) and the fourth partial insulating layer (204) along the second direction (Y) is B1, satisfying: 2mm≤B1-B≤7mm.

8. The cell of claim 1 or 2, wherein, Further comprising a second insulating layer (23); The tab (12) has another side surface opposite to the one side surface, and the other side surface is provided with the second insulating layer (23).

9. The electric cell of claim 8, wherein, The first insulating layer (20) and the second insulating layer (23) are an integral structure or a separate structure.

10. The cell of claim 1 or 2 or the cell of claim 3, wherein, The tab (12) includes a plurality of sub-tabs (121); The thickness direction of the pole core (10) is the third direction (Z), and the plurality of sub-tabs (121) are stacked along the third direction (Z), the plurality of sub-tabs (121) are respectively electrically connected with the pole core body (11), adjacent sub-tabs (121) are electrically connected to form an electrical connection part, and at least one sub-tab (121) is provided with the first insulating layer (20) on one side or both sides of the surface where the electrical connection part is formed.

11. The cell of claim 1 or 2 or said, characterized in that, Further comprising a shell; The pole core (10) is arranged in the shell, and one side surface of the tab (12) faces one side of the shell.

12. A battery, characterized by Comprising: The battery cell of any one of claims 1-11.

13. An electrical device, comprising: Comprising: The battery of claim 12.

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