Battery cell, battery pack and power utilization device

Abstract

The embodiment of the utility model provides a battery cell, a battery pack and a power utilization device. The battery cell comprises a battery cell body; the tab group is connected with the battery cell body and extends outwards from the battery cell body, the tab group comprises at least two tabs which are laminated along the first direction, each tab comprises a first section, a middle section and a second section which are connected in sequence, the first section is connected to the battery cell body, and the second section is connected to the middle section. And the middle sections of the adjacent tabs are adhered through an insulating adhesive layer. According to the embodiment of the invention, the middle sections of the two adjacent layers of tabs are connected together through the insulating glue layer, so that the middle sections of the adjacent tabs can be restrained mutually, the strength of the middle sections of the tabs is improved, the deformation of the middle areas of the tabs is reduced, the problem of insertion of the tabs is reduced, and the safety of the battery is improved.

Description

Technical Field

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

[0002] As a new energy source, lithium-ion batteries have advantages such as high energy density and long cycle life, and are widely used in electric vehicles, energy storage and other fields.

[0003] In related technologies, lithium-ion battery cells typically consist of a cell body and multiple layers of tabs connected to the cell body. The arrangement of multiple tabs allows the cell body to have higher power and energy. However, because the tabs are relatively thin, the multiple tabs are prone to deformation and insertion into the cell body, causing safety risks such as short circuits and reducing battery safety. Utility Model Content

[0004] This application aims to provide a battery cell, battery pack, and power device to solve the problem that existing electrode tabs are easily inserted into the battery cell body, causing short circuits and other safety risks, which reduces the safety of the battery.

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

[0006] In a first aspect, this application discloses a battery cell having a first orientation, including:

[0007] Battery cell body;

[0008] And a tab assembly, the tab assembly being connected to the cell body and extending outward from the cell body, the tab assembly including at least two tabs stacked along the first direction, the tab including a first segment, a first intermediate segment and a second segment connected in sequence, the first segment being connected to the cell body, and the first intermediate segments of adjacent tabs being bonded together by an insulating adhesive layer.

[0009] Optionally, there are multiple insulating adhesive layers, with each insulating adhesive layer disposed between the first intermediate sections of two adjacent tabs.

[0010] Optionally, there are multiple electrode groups, and at least two electrode groups have different numbers of electrodes.

[0011] Optionally, the number of tabs in the tab group located at the edge of the cell body is greater than the number of tabs in the tab group located in the middle region of the cell body.

[0012] Optionally, it also has a second direction that intersects with the first direction.

[0013] The battery cell further includes a connecting piece, which is spaced apart from the battery cell body along the second direction;

[0014] Of the plurality of electrode groups, a portion of the electrode groups are disposed on one side of the battery cell body along the first direction to form an anode electrode assembly, and another portion of the electrode groups are disposed on the other side of the battery cell body along the first direction to form a cathode electrode assembly.

[0015] The anode tab assembly and the cathode tab assembly are located between the cell body and the connecting piece. The anode tab assembly includes a third section, a second intermediate section and a fourth section connected in sequence, and the third section is connected to the cell body.

[0016] The cathode tab assembly includes a fifth segment, a third intermediate segment, and a sixth segment connected in sequence, with the fifth segment connected to the cell body;

[0017] The fourth segment of the anode tab assembly and the sixth segment of the cathode tab assembly are both connected to the connecting piece.

[0018] Optionally, the battery cell further includes a protective sheet;

[0019] The protective plate is connected to the fourth section of the anode tab assembly and the sixth section of the cathode tab assembly on the side away from the connecting plate.

[0020] Optionally, the protective sheet and the middle region of the battery cell body are spaced apart along the second direction;

[0021] The anode tab assembly is bent toward the protective sheet along the first direction, and the cathode tab assembly is bent toward the protective sheet along the first direction.

[0022] Optionally, the battery cell body includes an anode conductive layer, a cathode conductive layer, and a separator layer disposed between the anode conductive layer and the cathode conductive layer; the anode conductive layer, the cathode conductive layer, and the separator layer are wound together.

[0023] The anode tab assembly is connected to the anode conductive layer, and the cathode tab assembly is connected to the cathode conductive layer.

[0024] Secondly, this application also discloses a battery pack, the battery pack comprising: the battery cells described in any of the above claims.

[0025] Thirdly, this application also discloses an electrical device, which includes: the battery pack described above, or the battery cell described in any of the above-mentioned items.

[0026] In this embodiment, the battery cell includes a battery cell body and a tab assembly. The tab assembly consists of at least two stacked tabs, and the middle sections of two adjacent tabs are fixedly connected by an insulating adhesive layer. In this way, the middle sections of adjacent tabs can be mechanically constrained by the insulating adhesive layer, which improves the structural strength of the tab assembly, reduces the deformation of the middle sections of the tabs in the tab assembly, and thus reduces the occurrence of tab insertion problems and improves the safety of the battery.

[0027] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description

[0028] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0029] Figure 1 This is a schematic cross-sectional view of a battery cell provided in an embodiment of this application;

[0030] Figure 2 This is a partial cross-sectional schematic diagram of a battery cell provided in an embodiment of this application;

[0031] Figure 3 This is a partial cross-sectional schematic diagram of the tab of a battery cell provided in an embodiment of this application;

[0032] Figure 4 This is a cross-sectional schematic diagram of the positive electrode tab assembly and the negative electrode tab assembly of a battery cell provided in an embodiment of this application.

[0033] Reference numerals: 10 – Cell body; 20 – Tab assembly; 201 – Tab; 2011 – First section; 2012 – First intermediate section; 2013 – Second section; 21 – Anode tab assembly; 211 – Third section; 212 – Second intermediate section; 213 – Fourth section; 22 – Cathode tab assembly; 221 – Fifth section; 222 – Third intermediate section; 223 – Sixth section; 30 – Connecting piece; 40 – Protective piece; 50 – Housing; 60 – Insulating adhesive layer; X – First direction; Y – Second direction. Detailed Implementation

[0034] The embodiments of this utility model will now be described in detail. Examples of these embodiments are shown 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 utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0035] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0036] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "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 are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to 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 utility model.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0038] A battery cell consists of a cell body and a tab assembly connected to the cell body. The tab assembly comprises multiple tabs stacked together, forming a multi-layer tab structure. While this multi-layer tab structure improves the connection efficiency and reliability of the battery cell, the bottom section of the multi-layer tabs is connected to the cell body, and the top section is fixed by a welding area. However, the middle section of the multi-layer tabs lacks sufficient support and is prone to local deformation under external pressure, bending force, or other mechanical stress. This deformation may cause the tabs to squeeze or misalign with each other, potentially leading to the middle section of the tabs inserting into the cell body. Once the tabs insert into the cell body, they may puncture the separator, causing direct contact between the positive and negative electrodes, resulting in short circuits and other problems. Short circuits may trigger thermal runaway, leading to fires or explosions and other safety hazards, thus reducing the overall safety of the battery.

[0039] Based on the above analysis, this application provides a battery cell. Specifically, the battery cell can be a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and this application is not limited in this regard. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application is not limited in this regard either. The battery cell of this application will be described in detail below with reference to the accompanying drawings.

[0040] Reference Figures 1-4 The battery cell provided in this application embodiment may specifically include: a battery cell body 10; and a tab group 20. The tab group 20 is connected to the battery cell body 10 and extends outward from the battery cell body 10. The tab group 20 includes at least two tabs 201 stacked along the first direction X. The tab 201 includes a first segment 2011, a first intermediate segment 2012 and a second segment 2013 connected in sequence. The first segment 2011 is connected to the battery cell body 10. The first intermediate segments 2012 of adjacent tabs 201 are bonded together by an insulating adhesive layer 60.

[0041] like Figure 1 As shown, specifically, the battery cell has a first direction X, which can be the thickness direction of the battery cell body 10, such as... Figure 1 The X-axis direction is shown. Specifically, the cell body 10 is the main component of the cell, and the cell body 10 can realize the storage and release of electrical energy through the conversion of chemical energy and electrical energy.

[0042] The tab assembly 20 is connected to the cell body 10 and extends outward from the cell body 10. The tab assembly 20 is a metal conductor that leads the positive and negative electrodes of the cell body 10 out of the cell body 10. The tab assembly 20 includes at least two tabs 201, which are stacked in a first direction X.

[0043] like Figures 2-3 As shown, the tab 201 includes a first section 2011, a first intermediate section 2012, and a second section 2013. The first section 2011 is the root region of the tab 201 and is connected to the cell body 10. The second section 2013 is the top region of the tab 201 and can be a welding area for connecting multiple tabs 201 of the tab assembly 20 or for connecting multiple tabs 201 to the connecting piece 30 or other components. The first intermediate section 2012 is the region of the tab 201 located between the first section 2011 and the second section 2013.

[0044] like Figures 2-3As shown, in at least two tabs 201 of the tab assembly 20, an insulating adhesive layer 60 is provided between the first intermediate sections 2012 of two adjacent tabs 201. This insulating adhesive layer 60 can be a double-sided insulating adhesive layer, with both adhesive surfaces of the double-sided insulating adhesive layer bonded to the first intermediate sections 2012 of the two adjacent tabs 201, thereby achieving a fixed connection between the first intermediate sections 2012 of the two adjacent tabs 201. The insulating adhesive layer 60 can be, for example, PET adhesive or PI adhesive, and can be specifically designed according to actual conditions; this embodiment does not impose specific limitations on this.

[0045] In this embodiment, the battery cell includes a cell body 10 and a tab assembly 20. The tab assembly 20 is composed of at least two stacked tabs 201, and the first intermediate sections 2012 of adjacent tabs 201 are fixedly connected by an insulating adhesive layer 60. This provides a mechanical constraint on the first intermediate sections 2012 of adjacent tabs 201 through the insulating adhesive layer 60, improving the structural strength of the tab assembly 20, reducing deformation of the first intermediate sections 2012 of the tabs 201, and thus reducing the occurrence of tab insertion problems and improving battery safety. Furthermore, the first intermediate sections 2012 of adjacent tabs 201 are bonded together by the insulating adhesive layer 60, reducing the probability of cell body 10 failure due to conductive contact between tabs 201.

[0046] It should be noted that the number of electrodes 201 in the electrode group 20 can be 2, 3, 4, 5, 6, etc., and this application embodiment does not make a specific limitation on this.

[0047] Optionally, there are multiple insulating adhesive layers 60, each insulating adhesive layer 60 being disposed between the first intermediate section 2012 of two adjacent tabs 201.

[0048] Specifically, such as Figures 1-3 As shown, when the number of tabs 201 in the tab group 20 is at least three, the number of corresponding insulating adhesive layers 60 can be multiple. An insulating adhesive layer 60 can be provided between the first intermediate section 2012 of every two adjacent tabs 201. For example, when the number of tabs 201 is three, the number of insulating adhesive layers can be two.

[0049] In practical applications, multiple insulating adhesive layers 60 can be used to fix and connect the first intermediate sections 2012 of multiple tabs 201 in the tab assembly 20, so that the first intermediate sections 2012 of every two adjacent tabs 201 in the tab assembly 20 form a mechanical constraint, further improving the structural strength of the tab assembly 20, reducing the deformation of the first intermediate sections 2012 of the tabs 201 in the tab assembly 20, thereby reducing the occurrence of tab insertion problems and improving battery safety.

[0050] Optionally, there may be multiple electrode groups 20, and at least two electrode groups 20 may have different numbers of electrodes 201.

[0051] like Figure 1 and Figure 2 As shown, there are multiple electrode groups 20, which are respectively disposed on the battery cell body 10 along the first direction X. Each electrode group 20 includes at least two electrodes 201 stacked together to form a multi-layer electrode 201 structure. For example, the number of electrode groups 20 can be 2, 3, 4, 5, etc., and this application embodiment does not specifically limit this.

[0052] In multiple tab groups 20, at least two tab groups 20 have a different number of tabs 201. For example, one tab group 20 may have two tabs 201, and another tab group 20 may have four tabs 201. In this embodiment, by setting different numbers of tab groups 20 on the cell body 10, the current can be distributed more evenly. This avoids excessive current density in certain areas, which could lead to overheating and deformation of the tabs 201, thereby reducing the risk of tabs 201 interfering. Furthermore, tab groups 20 with a larger number of tabs 201 can form a more stable overall structure, effectively preventing individual tabs 201 from bending or displacing due to mechanical stress, thereby reducing the occurrence of interfering and improving the safety of the cell.

[0053] Optionally, the number of tabs 201 in the tab group 20 located at the edge of the cell body 10 is greater than the number of tabs 201 in the tab group 20 located in the middle region of the cell body 10.

[0054] Specifically, such as Figure 1 and Figure 2 As shown, multiple tab groups 20 are sequentially arranged along a first direction X on one side of the cell body 10, wherein the number of tab groups 20 located at the edge of the cell body 10 is greater than the number of tabs 201 located in the middle region of the cell body 10. For example, a group of tab groups 20 containing 10 tabs 201 can be arranged in the edge region of the cell body 10, while a group of tab groups 20 containing 6 tabs 201 can be arranged in the middle region of the cell body 10.

[0055] In this embodiment, by increasing the number of tabs 20 located at the edge of the cell body 10, a more stable overall structure can be formed, preventing internal insertion caused by deformation of individual tabs 201. Simultaneously, by reducing the number of tabs 201 in the tab group 20 in the middle region of the cell body 10, relatively spacious internal space can be maintained, further reducing the probability of tab 201 internal insertion and improving battery safety.

[0056] Optionally, it also has a second direction Y intersecting the first direction X. The battery cell also includes a connecting piece 30, which is spaced apart from the battery cell body 10 along the second direction Y. Among the multiple tab groups 20, a portion of the tab groups 20 are disposed on one side of the battery cell body 10 along the first direction X to form an anode tab assembly 21, and another portion of the tab groups 20 are disposed on the other side of the battery cell body 10 along the first direction X to form a cathode tab assembly 22. The anode tab assembly 21 and the cathode tab assembly 22 are located in the battery cell body 10. Between the core body 10 and the connecting piece 30, the anode tab assembly 21 includes a third segment 211, a second intermediate segment 212 and a fourth segment 213 connected in sequence, with the third segment 211 connected to the core body 10; the cathode tab assembly 22 includes a fifth segment 221, a third intermediate segment 222 and a sixth segment 223 connected in sequence, with the fifth segment 221 connected to the core body 10; the fourth segment 213 of the anode tab assembly 21 and the sixth segment 223 of the cathode tab assembly 22 are both connected to the connecting piece 30.

[0057] like Figures 1-2 As shown, the second direction Y is as follows Figures 1-2 As shown in the Y-axis direction, the second direction Y intersects with the first direction X, and preferably, the first direction X is perpendicular to the second direction Y.

[0058] Specifically, such as Figures 2-4 As shown, among the multiple tab groups 20, a portion of the tab groups 20 are disposed on the left side of the cell body 10 along the first direction X, and another portion of the tab groups 20 are disposed on the right side of the cell body 10 along the first direction X. The anode tab assembly 21 includes a portion of the tab groups 20 disposed on the left side of the cell body 10. The number of the tab groups 20 included in the anode tab assembly 21 can be 2 groups, 3 groups, etc. In this embodiment, 2 groups are used as an example. Among them, the tabs 201 of the tab groups 20 included in the anode tab assembly 21 are anode tabs, which are metal conductors that lead out the positive electrode inside the cell body 10.

[0059] The cathode tab assembly 22 includes another tab group 20 disposed on the right side of the cell body 10. The number of tab groups 20 included in the cathode tab assembly 22 can be 2 groups, 3 groups, etc. In this embodiment, 2 groups are used as an example. Among them, the tab 201 of the tab group 20 included in the cathode tab assembly 22 is the cathode tab, which is a metal conductor that leads out the negative electrode in the main body.

[0060] In this embodiment, the insulating adhesive layer 60 is located between at least two adjacent anode tabs and at least two adjacent cathode tabs to connect the first intermediate sections 2012 of the two anode tabs and the two cathode tabs. The insulating adhesive layer 60 can mechanically constrain the adjacent anode tabs in the anode tab assembly 21 and the first intermediate sections 2012 of the two adjacent cathode tabs in the cathode tab assembly 22, thereby improving the structural strength of the anode tab assembly 21 and the cathode tab assembly 22, reducing the deformation of the first intermediate sections 2012 of the tabs 201 in the anode tab assembly 21 and the cathode tab assembly 22, and thus reducing the occurrence of tab 201 insertion problems and improving the safety of the battery body.

[0061] The anode tab assembly 21 includes a third segment 211, a second intermediate segment 212, and a fourth segment 213 connected in sequence, with the third segment 211 connected to the cell body 10; the cathode tab assembly 22 includes a fifth segment 221, a third intermediate segment 222, and a sixth segment 223 connected in sequence, with the fifth segment 221 connected to the cell body 10; the fourth segment 213 of the anode tab assembly 21 and the sixth segment 223 of the cathode tab assembly 22 are both welded to the connecting piece 30, thereby connecting the anode tab assembly 21 and the cathode tab assembly 22 between the cell body 10 and the connecting piece 30.

[0062] In some alternative embodiments, the battery cell also includes a protective sheet 40; the protective sheet 40 is connected to the fourth segment 213 of the anode tab assembly 21 and the sixth segment 223 of the cathode tab assembly 22 on the side away from the connecting piece 30.

[0063] like Figures 1-2 As shown, specifically, one side of the fourth segment 213 of the anode tab assembly 21 and one side of the sixth segment 223 of the cathode tab assembly 22 are welded to the connecting piece 30. At the same time, the other side of the fourth segment 213 of the anode tab assembly 21 and one side of the sixth segment 223 of the cathode tab assembly 22, that is, the side of the fourth segment 213 of the anode tab assembly 21 and one side of the sixth segment 223 of the cathode tab assembly 22 away from the connecting piece 30, is welded to the protective piece 40. In this way, the fourth segment 213 of the anode tab assembly 21 and the sixth segment 223 of the cathode tab assembly 22 can be connected between the protective piece 40 and the connecting piece 30, which can enhance the shock resistance of the connection structure, reduce the risk of loosening or breaking of the connection due to external impact or vibration, and improve the reliability of the battery cell.

[0064] Optionally, the protective sheet 40 and the cell body 10 are spaced apart along the second direction Y; the anode tab assembly 21 is bent toward the protective sheet 40 along the first direction X, and the cathode tab assembly 22 is bent toward the protective sheet 40 along the first direction X.

[0065] like Figures 1-2As shown, the protective sheet 40 is spaced apart from the middle area of ​​the cell body 10, meaning the protective sheet 40 is located in the middle of the cell body 10. The anode tab assembly 21 is bent towards the protective sheet 40 along the first direction X on the left side of the cell body 10. At the same time, the cathode tab assembly 22 is bent towards the protective sheet 40 along the first direction X on the right side of the cell body 10. This allows the anode tab assembly 21 and the cathode tab assembly 22 to be bent relative to each other along the first direction X, so that one side of the fourth segment 213 of the anode tab assembly 21 and the sixth segment 223 of the cathode tab assembly 22 are welded in the middle area of ​​the connecting piece 30. Meanwhile, the other side of the fourth segment 213 of the anode tab assembly 21 and the sixth segment 223 of the cathode tab assembly 22 can be welded using only one protective sheet 40. This reduces the number of protective sheets 40, thereby reducing the cost of the cell.

[0066] Optionally, the battery cell body 10 includes an anode conductive layer, a cathode conductive layer, and a separator layer disposed between the anode conductive layer and the cathode conductive layer; the anode conductive layer, the cathode conductive layer, and the separator layer are wound together; wherein, the anode tab assembly 21 is connected to the anode conductive layer, and the cathode tab assembly 22 is connected to the cathode conductive layer.

[0067] Specifically, the battery cell body 10 is formed by sequentially winding an anode conductive layer, a separator layer, and a cathode conductive layer. The anode conductive layer is the anode or negative electrode of the battery cell body 10, and the cathode conductive layer is the cathode or positive electrode of the battery cell body 10. The separator layer is located between the anode conductive layer and the cathode conductive layer, and is used to isolate the anode conductive layer and the cathode conductive layer to prevent short circuits caused by contact between the anode conductive layer and the cathode conductive layer. The separator layer also serves to form a channel for ion movement between the anode conductive layer and the cathode conductive layer.

[0068] The material of the anode conductive layer may include manganese dioxide, etc., and the material of the cathode conductive layer may include lithium or lithium-containing alloys, etc. The material of the separator layer may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator layer may be a single-layer film or a multi-layer composite film, and this application embodiment does not specifically limit this. When the separator layer is a multi-layer composite film, the materials of each layer may be the same or different, and this application embodiment does not specifically limit this.

[0069] In some alternative embodiments, the battery cell further includes a housing 50, which has a receiving cavity. The battery cell body 10, the tab assembly 20, the connecting piece 30, and the protective piece 40 are all disposed in the receiving cavity. In this way, the housing 50 can protect the battery cell body 10, the tab assembly 20, the connecting piece 30, and the protective piece 40, and prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell.

[0070] In summary, the battery cell described in the embodiments of this application may include at least the following advantages:

[0071] In this embodiment, the battery cell includes a cell body 10 and a tab assembly 20. The tab assembly 20 is composed of at least two stacked tabs 201, and the first intermediate sections 2012 of adjacent tabs 201 are fixedly connected by an insulating adhesive layer 60. This provides a mechanical constraint on the first intermediate sections 2012 of adjacent tabs 201 through the insulating adhesive layer 60, improving the structural strength of the tab assembly 20, reducing deformation of the first intermediate sections 2012 of the tabs 201, and thus reducing the occurrence of tab insertion problems and improving battery safety. Furthermore, the first intermediate sections 2012 of adjacent tabs 201 are bonded together by the insulating adhesive layer 60, reducing the probability of cell body 10 failure due to conductive contact between tabs 201.

[0072] This application also provides a battery pack, which includes the cells of any of the above embodiments.

[0073] Specifically, a battery pack includes a housing and one or more battery cells. These cells can be connected in series and / or in parallel via terminals to provide higher voltage and capacity for various applications. The battery cells are housed within the housing, which protects them from liquids or other foreign matter that could affect their charging or discharging.

[0074] It should be noted that in this embodiment, the structure of the battery cell is the same as that of the battery cell in any of the above embodiments, and its beneficial effects are similar, so it will not be described in detail here.

[0075] This application also provides an electrical device, which may specifically include the battery pack described in the above embodiments or the battery cell described in any of the above embodiments.

[0076] Specifically, the battery pack in this application is applicable to various battery-using devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0077] It should be noted that in this embodiment, the structure of the battery pack or the battery cell is the same as that of the battery pack or battery cell in any of the above embodiments, and their beneficial effects are similar, so they will not be described in detail here.

[0078] 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 the present invention. 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.

[0079] Although embodiments of the present invention 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 the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell having a first orientation (X), characterized in that, include: Battery cell body (10); And a tab assembly (20), the tab assembly (20) being connected to the cell body (10) and extending outward from the cell body (10), the tab assembly (20) including at least two tabs (201) stacked along the first direction (X), the tab (201) including a first segment (2011), a first intermediate segment (2012) and a second segment (2013) connected in sequence, the first segment (2011) being connected to the cell body (10), and the first intermediate segments (2012) of adjacent tabs (201) being bonded together by an insulating adhesive layer (60).

2. The battery cell according to claim 1, characterized in that, There are multiple insulating adhesive layers (60), and each insulating adhesive layer (60) is disposed between the first intermediate section (2012) of two adjacent tabs (201).

3. The battery cell according to claim 2, characterized in that, There are multiple electrode groups (20), and at least two electrode groups (20) have different numbers of electrodes (201).

4. The battery cell according to claim 3, characterized in that, The number of tabs (201) in the tab group (20) located at the edge of the cell body (10) is greater than the number of tabs (201) in the tab group (20) located in the middle region of the cell body (10).

5. The battery cell according to claim 2, characterized in that, It also has a second direction (Y) that intersects the first direction (X); The battery cell also includes a connecting piece (30), which is spaced apart from the battery cell body (10) along the second direction (Y); Of the plurality of electrode groups (20), a portion of the electrode groups (20) are disposed on one side of the cell body (10) along the first direction (X) to form an anode electrode assembly (21), and another portion of the electrode groups (20) are disposed on the other side of the cell body (10) along the first direction (X) to form a cathode electrode assembly (22). The anode tab assembly (21) and the cathode tab assembly (22) are located between the cell body (10) and the connecting piece (30). The anode tab assembly (21) includes a third segment (211), a second intermediate segment (212) and a fourth segment (213) connected in sequence. The third segment (211) is connected to the cell body (10). The cathode tab assembly (22) includes a fifth segment (221), a third intermediate segment (222) and a sixth segment (223) connected in sequence, wherein the fifth segment (221) is connected to the battery cell body (10); The fourth segment (213) of the anode tab assembly (21) and the sixth segment (223) of the cathode tab assembly (22) are both connected to the connecting piece (30).

6. The battery cell according to claim 5, characterized in that, The battery cell also includes a protective sheet (40); The protective plate (40) is connected to the fourth segment (213) of the anode tab assembly (21) and the sixth segment (223) of the cathode tab assembly (22) on the side away from the connecting plate (30).

7. The battery cell according to claim 6, characterized in that, The protective sheet (40) and the battery cell body (10) are spaced apart along the second direction (Y) in the middle region; The anode tab assembly (21) is bent toward the protective sheet (40) along the first direction (X), and the cathode tab assembly (22) is bent toward the protective sheet (40) along the first direction (X).

8. The battery cell according to claim 4, characterized in that, The battery cell body (10) includes an anode conductive layer, a cathode conductive layer, and a separator layer disposed between the anode conductive layer and the cathode conductive layer; the anode conductive layer, the cathode conductive layer, and the separator layer are wound together. The anode tab assembly (21) is connected to the anode conductive layer, and the cathode tab assembly (22) is connected to the cathode conductive layer.

9. A battery pack, characterized in that, include: The battery cell according to any one of claims 1-8.

10. An electrical appliance, comprising: The battery pack of claim 9, or the battery cell of any one of claims 1-8.

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