Battery cell, battery, and electrical device

Abstract

The present disclosure relates to a battery cell, a battery, and an electrical device. The battery cell comprises: poles (5); an electrode assembly, the electrode assembly comprising a main body and tabs (1), each tab (1) being connected to a pole (5) by means of a welded connection portion (6), and the tab (1) being provided with a fuse portion (13) for overcurrent protection; and an insulating protective layer (7), at least covering the welded connection portion (6) and the fuse portion (13). The insulating protective layer (7) covers the welded connection portion (6), so as to prevent welding slag of the welded connection portion (6) from falling off, thereby helping to prevent the welding slag from falling into a battery cell (2) and causing wear or short circuiting of components of the battery cell (2). The insulating protective layer (7) helps to maintain the tabs (1) in the orientation the tabs (1) are in before a break occurs, and helps to prevent a broken tab (1) from coming into contact with the components of the battery cell (2) and forming a short circuit and damaging the battery cell (2).

Description

Battery cells, batteries and electrical equipment

[0001] The present disclosure is based on and claims priority to an application with CN application number 202420454385.8 and application date March 8, 2024. The disclosure content of the CN application is hereby incorporated into the present disclosure as a whole. Technical Field

[0002] The present disclosure relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0003] The tabs of the battery cell are connected to the poles, and the battery cell is provided with a fuse that melts when the current exceeds a set limit value. Once the fuse melts, there is a problem of affecting battery safety. Summary of the Invention

[0004] The present disclosure aims to provide a battery cell, a battery, and an electrical device to improve the problem in the related art that the fuse portion of the tab affects battery safety after it fuses.

[0005] According to one aspect of the embodiments of the present disclosure, the present disclosure provides a battery cell,

[0006] pole;

[0007] The electrode assembly includes a main body and a tab, the tab is connected to the pole via a welding connection, and the tab is provided with a fuse for overcurrent protection;

[0008] The insulating protective layer covers at least the welding connection part and the fuse part.

[0009] The insulating protective layer covers the welded connection to prevent welding slag from falling from the welded connection, which helps prevent the welding slag from falling into the battery cell and causing wear or short circuit of the battery cell components (such as the electrode, the active material on the electrode, and the insulating material layer). The insulating protective layer covers the fusible portion of the tab. After the fusible portion melts, the insulating protective layer helps maintain the tab in its pre-fracture posture to prevent the tab from overlapping with the battery cell components to form a short circuit and damage the battery cell. Even if the tab overlaps with the battery cell components after the break, the insulating protective layer helps prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0010] In some embodiments, the insulating protective layer includes a first insulating protective layer, the first insulating protective layer covering the side of the welded connection away from the pole and the first side of the fuse. The first insulating protective layer covers the side of the welded connection away from the pole and the first side of the fuse. This helps prevent welding slag from the welded connection from falling into the battery cell, causing wear or short circuiting of the battery cell components. It also helps maintain the tab after the fuse is broken in the same position as before it broke, preventing the broken tab from overlapping with the battery cell components and causing a short circuit. Even if the broken tab overlaps with the battery cell components, the insulating protective layer helps prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0011] In some embodiments, the first insulating protective layer is integral and covers the solder connection portion and the fuse portion. The integral arrangement of the first insulating protective layer is beneficial for simplifying the processing steps, improving production efficiency and reducing production costs.

[0012] In some embodiments, the first insulating protective layer includes a first section covering the weld connection and a second section covering the fuse. The first and second sections are spaced apart or at least partially overlap. The spacing between the first and second sections facilitates reducing the material requirements of the insulating protective layer and lowering production costs. The first and second sections at least partially overlap, increasing the coverage area of ​​the insulating protective layer and preventing welding slag from falling. Furthermore, the connection between the first and second sections increases the connection area and strength between the first insulating protective layer and the tab and / or weld connection, thereby facilitating the maintenance of the tab in its pre-breakage position after the fuse, thereby preventing the broken tab from overlapping with components of the battery cell and causing a short circuit.

[0013] In some embodiments, the first insulating protective layer protrudes from the welding connection portion and covers the pole. The first insulating protective layer extends from the welding adjustment portion to the pole, which increases the coverage area of ​​the first insulating protective layer and helps prevent welding slag from falling.

[0014] In some embodiments, the insulating protective layer also includes a second insulating protective layer covering the second side of the fuse part opposite to the first side. The first insulating protective layer and the second insulating protective layer are respectively provided on the opposite sides of the fuse part, which is beneficial to improve the strength of the insulating protective layer so as to maintain the pole ear after the fuse in the posture before the fracture, so as to prevent the pole ear after the fracture from overlapping with the components of the battery cell and forming a short circuit.

[0015] In some embodiments, the second insulating protective layer protrudes from the fuse portion and covers the pole. The second insulating protective layer protrudes from the fuse portion and covers the pole, which increases the connection area and strength between the second insulating protective layer and the pole ear and / or pole. This is beneficial for maintaining the pole ear after the fuse in the posture before the break, so as to prevent the broken pole ear from overlapping with the components of the battery cell and forming a short circuit.

[0016] In some embodiments, the tab further includes a missing portion arranged side by side with the fuse portion in the width direction or thickness direction of the tab, and the insulating protective layer covers the missing portion and the fuse portion.

[0017] The insulating protective layer covers the melting part and fills the solid part, further improving the strength of the insulating protective layer to maintain the tab after melting in the posture before breaking, so as to prevent the tab after breaking from overlapping with the components of the battery cell and forming a short circuit.

[0018] In some embodiments, the insulating protective layer includes an insulating rubber layer, a polyethylene terephthalate material film, and a polyimide material film. The material of the insulating protective layer can effectively prevent welding slag from falling into the battery cell and causing wear or short circuit of the battery cell components, and maintain the tab in its pre-break posture after the fuse part melts to prevent the broken tab from overlapping with the battery cell components to form a short circuit and damage the battery cell.

[0019] According to another aspect of the present application, a battery is provided, comprising the above-mentioned battery cell.

[0020] According to another aspect of the present application, an electric device is provided, which includes the above-mentioned battery.

[0021] By applying the technical solution of the present application, an insulating protective layer covers the welded connection to prevent welding slag from falling from the welded connection, thereby preventing the welding slag from falling into the battery cell and causing wear or short circuit of the battery cell components. The insulating protective layer covers the fusible portion of the tab. After the fusible portion is blown, the insulating protective layer helps maintain the tab in its pre-fracture posture to prevent the tab from overlapping with the battery cell components, causing a short circuit and damaging the battery cell. Even if the tab overlaps with the battery cell components after the breakage, the insulating protective layer helps prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0022] Other features and advantages of the present disclosure will become apparent from the following detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] FIG1 shows a schematic structural diagram of an electrical device according to some embodiments of the present application;

[0025] FIG2 shows a schematic structural diagram of a battery according to some embodiments of the present application;

[0026] FIG3 shows a schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0027] FIG4 shows a cross-sectional view of a battery cell according to some embodiments of the present application;

[0028] FIG5 shows an enlarged schematic diagram of point A in FIG4 ;

[0029] FIG6 shows an enlarged schematic diagram of a battery cell according to some other embodiments of the present application;

[0030] FIG7 shows an enlarged schematic diagram of a battery cell according to some other embodiments of the present application;

[0031] FIG8 shows a schematic structural diagram of tabs according to other embodiments of the present application. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0034] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0036] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0037] Unless otherwise specified, the terms "include" and "comprising" used in this application may be open-ended or closed-ended. For example, "include" and "comprising" may mean that other components not listed may also be included or that only the listed components are included.

[0038] Unless otherwise specified, the term "or" is used in this application to be inclusive. For example, the phrase "A or B" means "A, B, or both A and B." More specifically, the condition "A or B" is satisfied if any of the following conditions are met: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0039] Currently, market developments indicate that power batteries are becoming increasingly widely used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric vehicles, as well as in military equipment and aerospace. As power battery applications continue to expand, market demand is also growing.

[0040] To maximize internal cell space utilization, many existing lithium-ion batteries eliminate the adapter plate and directly weld the electrode assembly to the top cover terminal. Without an adapter plate, a fuse cannot be installed on the adapter plate. Consequently, if an external short circuit occurs in the cell, the cell's overcurrent chain lacks a pre-set fuse area, making it impossible to disconnect the chain. This can lead to prolonged high-current discharge throughout the cell, triggering thermal runaway and creating safety concerns. To address this issue, a fuse can be installed on the tab. Specifically, a slot is punched out on the tab, or a missing portion with a slot is directly formed on the tab, and the remaining area is the fuse portion. Therefore, the overcurrent cross-section of the fuse portion is small, and the resistance is relatively large, making it an area that is relatively easy to melt. Therefore, when a short circuit occurs outside the battery cell connected to the tab, a large instantaneous current is generated inside the battery cell. Since the overcurrent cross-section of the tab is small and the resistance is relatively large, when the current passes through the fuse portion, the fuse portion melts and terminates the short circuit process. The tab is welded to the pole column, and the welding slag generated by the welding may fall into the battery cell, causing wear or short circuit of the battery cell components (such as the pole piece, the active material on the pole piece, and the insulating material layer). The falling welding slag may also cause other losses. After the fuse portion of the tab melts, the broken tab may overlap with the components of the battery cell to form a short circuit, resulting in a high-voltage arc and causing the battery cell to fail.

[0041] Based on the above considerations, and to address the issues of welding slag easily causing wear or short circuits in battery cells, as well as the potential for broken tabs to overlap with battery cell components, thus causing short circuits, the present inventors, after in-depth research, have designed a battery cell. The cell includes a pole and an electrode assembly. The electrode assembly includes a body and tabs. The tabs are connected to the pole via welded connections, and the tabs are provided with a fuse for overcurrent protection. Furthermore, the cell includes an insulating protective layer that covers at least the welded connections and the fuse.

[0042] The insulating protective layer covers the welded connection to prevent welding slag from falling from the welded connection, which helps prevent the welding slag from falling into the battery cell and causing wear or short circuit of the battery cell components (such as the electrode, the active material on the electrode, and the insulating material layer). The insulating protective layer covers the fusible portion of the tab. After the fusible portion melts, the insulating protective layer helps maintain the tab in its pre-fracture posture to prevent the tab from overlapping with the battery cell components to form a short circuit and damage the battery cell. Even if the tab overlaps with the battery cell components after the break, the insulating protective layer helps prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0043] FIG1 shows a schematic structural diagram of an electrical device that uses a battery as a power source; as shown in FIG1 , the electrical device of this embodiment includes a vehicle 1000, which may be a pure electric vehicle, a hybrid electric vehicle, or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and operating power requirements of the vehicle 1000 during driving.

[0044] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0045] As shown in Figure 2, the battery 100 includes a housing 110 and a battery module disposed within the housing 110. The battery module includes a plurality of battery cells 120, which are housed within the housing 110. The housing 110 is used to provide a storage space for the battery cells 120, and the housing 110 can have various structures. In some embodiments, the housing 110 can include a first portion 111 and a second portion 112, which overlap with each other and together define a storage space for the battery cells 120. The second portion 112 can be a hollow structure with one end open, and the first portion 111 can be a plate-like structure, which overlaps the open side of the second portion 112, so that the first portion 111 and the second portion 112 together define a storage space. Alternatively, the first portion 111 and the second portion 112 can each be a hollow structure with one end open, with the open side of the first portion 111 overlapping the open side of the second portion 112. Of course, the box body 110 formed by the first part 111 and the second part 112 can be in various shapes, such as a cylinder, a cuboid, etc.

[0046] In the battery 100, there may be multiple battery cells 120, and the multiple battery cells 120 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 120. The multiple battery cells 120 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 120 may be housed within the housing 110. Of course, the battery 100 may also be formed by first connecting multiple battery cells 120 in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed within the housing 110. The battery 100 may also include other structures, for example, the battery 100 may further include a busbar component for electrically connecting the multiple battery cells 120.

[0047] Each battery cell 120 may be a secondary battery or a primary battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 120 may be cylindrical, flat, rectangular, or in other shapes.

[0048] 3 to 7 , in some embodiments, the battery cell 120 includes a housing 4 , a pole 5 , a battery cell 2 , an end cover 3 and a tab 1 .

[0049] The battery cell 2 is disposed within a housing 4. An end cap 3 is mounted on the open end of the housing 4. A terminal 5 extends through the end cap 3. The end of the terminal 5 located inside the end cap 3 is connected to the battery cell 2 via a tab 1. The end of the terminal 5 located outside the end cap 3 is used to connect to the terminal of an electrical device or other battery cell. In some embodiments, the tab 1 is integral with the current collector of the battery cell 2.

[0050] The end cap 3 is a component that covers the opening of the housing 4 to isolate the internal environment of the battery cell 120 from the external environment. The terminal 5 is provided on the end cap 3 and can be used to electrically connect to the battery cell 2 to output or input power to the battery cell 120.

[0051] The housing 4 is a component used to cooperate with the end cover 3 to form an internal environment of the battery cell 120, wherein the formed internal environment can be used to accommodate the battery cell 2, electrolyte and other components.

[0052] The battery cell 2 is the component within the battery cell 120 where the electrochemical reaction occurs. The housing 4 may contain one or more battery cells 2. The battery cell 2 is primarily formed by winding or stacking electrode sheets, including positive and negative electrodes, with a separator typically positioned between the positive and negative electrodes.

[0053] The electrode sheet mainly consists of a thin sheet of current collector and an active material coated on the current collector. The parts of the positive and negative electrode sheets with active material constitute the main body of the battery cell assembly, and the parts of the positive and negative electrode sheets without active material each constitute the electrode tab 1.

[0054] A battery cell includes a terminal 5 and an electrode assembly. The electrode assembly includes a main body and a tab 1. The tab 1 is connected to the terminal 5 via a welded connection 6. As shown in Figures 5 to 8 , the first end 11 of the tab 1 is connected to the battery cell 2, and the second end of the tab 1 is connected to the terminal 5 via a welded connection. The tab 1 is provided with a fuse 13 for overcurrent protection. When the current of the battery cell exceeds a set current, the fuse 13 will be melted to protect the battery cell 2 of the battery cell from damage due to excessive current.

[0055] The second end 12 of the tab 1 is welded to the terminal post 5. The welding slag produced may fall into the battery cell 2, causing wear or short circuiting of components of the battery cell 2 (e.g., the electrode, the active material on the electrode, and the insulating material layer). The falling slag may also cause other losses. After the fusible portion 13 of the tab 1 melts, the broken tab 1 may overlap with components of the battery cell 2, forming a short circuit, generating a high-voltage arc, and causing the battery cell 2 to fail.

[0056] In order to improve the above-mentioned problem, the electrode assembly of this embodiment further includes an insulating protective layer 7 , which at least covers the welding connection portion 6 and the fuse portion 13 .

[0057] The insulating protective layer 7 covers the welding connection portion 6 to prevent the welding slag from the welding connection portion 6 from falling, which helps prevent the welding slag from falling into the battery cell 2 and causing wear or short circuit of the components of the battery cell 2 (such as the electrode, the active material on the electrode, and the insulating material layer). The insulating protective layer 7 covers the fuse portion 13 of the tab 1. After the fuse portion 13 is blown, the insulating protective layer 7 helps maintain the tab 1 in its pre-break posture to prevent the tab 1 from overlapping with the components of the battery cell 2 after the break, causing a short circuit and damaging the battery cell 2. Even if the tab 1 after the break overlaps with the components of the battery cell 2, the insulating protective layer 7 helps prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0058] In some embodiments, referring to FIGS. 5 to 7 , the insulating protective layer 7 includes a first insulating protective layer 71 . The first insulating protective layer 71 covers a side of the welding connection portion 6 away from the pole 5 and a first side of the fuse portion 13 .

[0059] The pole 5 is located above the battery cell 2, the first end 11 of the tab 1 is connected to the battery cell 2, and the second end 12 of the tab 1 is welded to the lower surface of the pole 5. The fuse portion 13 of the tab 1 is located between the first end 11 and the second end 12 opposite to the first end in the longitudinal direction of the tab 1.

[0060] The first insulating protective layer 71 covers the side of the welded connection portion 6 away from the pole 5 and the first side of the fuse portion 13. This helps prevent welding slag from the welded connection portion 6 from falling into the battery cell 2 and causing wear or short circuit of the components of the battery cell 2. It also helps maintain the tab 1 after the fuse is broken in the posture before it breaks, so as to prevent the tab 1 from overlapping with the components of the battery cell 2 and causing a short circuit. Even if the tab 1 after the break forms an overlap with the components of the battery cell 2, the insulating protective layer 7 helps prevent the battery cell 2 from short circuiting, thereby improving the safety of the battery.

[0061] 5 and 6 , the first insulating protective layer 71 is integral and covers the welding connection portion 6 and the fuse portion 13. The integral arrangement of the first insulating protective layer 71 is beneficial for simplifying the processing steps, improving production efficiency and reducing production costs.

[0062] In some embodiments, referring to FIG. 7 , the first insulating protective layer 71 includes a first segment 711 covering the welding connection portion 6 and a second segment 712 covering the fuse portion 13 . The first segment 711 and the second segment 712 are spaced apart, thereby helping to solve the problem of insulating protective layer materials and reduce production costs.

[0063] In other embodiments, the first section 711 and the second section 712 of the first insulating protective layer 71 are separately arranged, so different materials can be selected for the first section 711 and the second section 712. For example, the second section 712 can be made of a material with a melting point and / or stiffness greater than that of the first section 711, so as to maintain the tab 1 in its original posture after the fuse 13 is blown, so as to prevent the broken tab 1 from overlapping with the components of the battery cell 2 to form a short circuit.

[0064] In other embodiments, the first section 711 and the second section 712 at least partially overlap, thereby increasing the coverage area of ​​the insulating protective layer and facilitating the prevention of welding slag from falling. Furthermore, the connection between the first section 711 and the second section 712 also increases the connection area and strength between the first insulating protective layer 71 and the tab and / or the weld connection portion 6, thereby facilitating the maintenance of the tab 1 after the melt is in the same position as before the break, thereby preventing the broken tab 1 from overlapping with components of the battery cell 2 and forming a short circuit.

[0065] 6 , the first insulating protective layer 71 protrudes from the welding connection portion 6 and covers the pole 5. The first insulating protective layer 71 extends from the welding adjustment portion 6 to the pole 5, increasing the coverage area of ​​the first insulating protective layer 71 and preventing welding slag from falling.

[0066] In some embodiments, the insulating protective layer 7 includes a second insulating protective layer 72 covering the second side of the fuse part 13 opposite to the first side, and the first insulating protective layer 71 and the second insulating protective layer 72 are respectively provided on the opposite sides of the fuse part 13, which is beneficial to improve the strength of the insulating protective layer 7 so as to maintain the tab 1 after the fuse in the posture before the fracture, so as to prevent the tab 1 after the fracture from overlapping with the components of the battery cell 2 and forming a short circuit.

[0067] In some embodiments, the second insulating protective layer 7 protrudes from the fuse portion 13 and covers the pole 5, thereby increasing the connection area and strength between the second insulating protective layer 72 and the pole lug 1 and / or the pole 5, thereby facilitating the maintenance of the pole lug 1 after the fuse in the posture before the break, so as to prevent the broken pole lug 1 from overlapping with the components of the battery cell 2 and forming a short circuit.

[0068] In some embodiments, the tab 1 further includes a missing portion 14 arranged side by side with the fuse portion 13 in the width direction or thickness direction of the tab 1, and the insulating protective layer 7 covers the missing portion 14 and the fuse portion 13. The insulating protective layer 7 covers the fuse portion 13 and fills the missing portion 14, further improving the strength of the insulating protective layer 7 to maintain the tab 1 after the fuse in the posture before the fracture, so as to prevent the tab 1 from overlapping with the components of the battery cell 2 after the fracture and forming a short circuit.

[0069] In some embodiments, the insulating protective layer includes one of an insulating adhesive layer, a polyethylene terephthalate (PET) film, and a polyimide (PI) film. The material of the insulating protective layer can effectively prevent welding slag from falling into the battery cell 2 and causing wear or short circuit of the battery cell components. It also maintains the tab 1 in its pre-break position after the fuse 13 has melted, preventing the broken tab 1 from overlapping with the components of the battery cell 2 and causing a short circuit, thereby damaging the battery cell.

[0070] The above description is merely an exemplary embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A battery cell, comprising: Pole (5); An electrode assembly comprises a main body and a pole tab (1), wherein the pole tab (1) is connected to the pole column (5) via a welding connection portion (6), and the pole tab (1) is provided with a fuse portion (13) for overcurrent protection; The insulating protective layer (7) at least covers the welding connection portion (6) and the fuse portion (13).

2. The battery cell according to claim 1, wherein the insulating protective layer (7) comprises a first insulating protective layer (71), the first insulating protective layer (71) covering a side of the welding connection portion (6) away from the pole (5) and a first side of the fuse portion (13).

3. The battery cell according to claim 2, wherein the first insulating protective layer (71) is integral and covers the welding connection portion (6) and the fuse portion (13).

4. A battery cell according to claim 2 or 3, wherein the first insulating protective layer (71) includes a first segment (711) covering the welding connection portion (6) and a second segment (712) covering the fuse portion (13), and the first segment (711) and the second segment (712) are arranged at intervals or the first segment (711) and the second segment (712) at least partially overlap.

5. The battery cell according to any one of claims 2 to 4, wherein the first insulating protective layer (71) protrudes from the welding connection portion (6) and covers the pole (5).

6. The battery cell according to any one of claims 2 to 5, wherein the insulating protective layer (7) further comprises a second insulating protective layer (72) covering a second side of the fuse portion (13) facing away from the first side.

7. The battery cell according to any one of claims 2 to 6, wherein the second insulating protective layer (7) protrudes from the fuse portion (13) and covers the electrode (5).

8. A battery cell according to any one of claims 1 to 7, wherein the tab (1) further comprises a missing portion (14) arranged side by side with the fuse portion (13) in the width direction or thickness direction of the tab (1), and the insulating protective layer (7) covers the missing portion (14) and the fuse portion (13). 9 . The battery cell according to claim 1 , wherein the insulating protective layer comprises one of an insulating adhesive layer, a polyethylene terephthalate film, and a polyimide film. 10 . A battery comprising the battery cell according to claim 1 .

11. An electrical device comprising the battery according to claim 10.

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