Battery monomer, battery and electric equipment

Abstract

The utility model relates to a single battery, a battery and electric equipment. The single battery comprises a pole (5) and an electrode assembly, the electrode assembly comprises a main body and a tab (1), the tab (1) is connected with the pole (5) through a welding connection part (6), and the tab (1) is provided with a fusing part (13) for overcurrent protection; an insulating protection layer (7) at least covering the welding connection part (6) and the fusing part (13); the insulating protection layer (7) covers the welding connection part (6) to prevent welding slag of the welding connection part (6) from falling off, so that the welding slag can be prevented from falling into the battery cell (2) to cause abrasion or short circuit of components of the battery cell (5); the insulating protective layer (7) is beneficial to maintaining the tab (1) in a posture before fracture and is beneficial to preventing the tab (1) after fracture from being in lap joint with a component of the battery cell (2) to form a short circuit to damage the battery cell (2).

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery monomer, a battery and an electrical device. Background Art

[0002] The pole ear of the battery cell is connected to the pole, and the battery cell is provided with a fuse that melts out when the current exceeds a set limit value. After the fuse melts out, there is a problem of affecting the safety of the battery. Utility Model Content

[0003] The utility model aims to provide a battery cell, a battery and an electrical device, so as to improve the problem in the related art that the fuse part of the pole ear affects the safety of the battery after the fuse part is fused.

[0004] According to one aspect of the embodiment of the utility model, the utility model provides a battery cell.

[0005] Pole;

[0006] The electrode assembly includes a main body and a pole ear, the pole ear is connected to the pole column through a welding connection part, and the pole ear is provided with a fuse part for overcurrent protection;

[0007] The insulating protective layer at least covers the welding connection part and the fuse part.

[0008] The insulating protective layer covers the welding connection to prevent the welding slag from falling off, which helps prevent the welding slag from falling into the battery cell and causing wear or short circuit of the components of the battery cell (such as the pole piece, the active material on the pole piece, and the insulating material layer). The insulating protective layer covers the fuse part of the pole ear. After the fuse part is blown, the insulating protective layer helps to maintain the pole ear in the posture before the break to prevent the broken pole ear from overlapping with the components of the battery cell to form a short circuit and damage the battery cell. Even if the broken pole ear overlaps with the components of the battery cell, the insulating protective layer helps to prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0009] In some embodiments, the insulating protective layer includes a first insulating protective layer, the first insulating protective layer covers the side of the welding connection away from the pole and the first side of the fuse, and the first insulating protective layer covers the side of the welding connection away from the pole and the first side of the fuse. It is helpful to prevent the welding slag of the welding connection from falling into the battery cell and causing wear or short circuit of the components of the battery cell, and it is also helpful to maintain the tab after the fuse in the posture before the break, so as to prevent the tab after the break from overlapping with the components of the battery cell to form a short circuit. Even if the tab after the break overlaps with the components of the battery cell, the insulating protective layer is also helpful to prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0010] In some embodiments, the first insulating protective layer is integrated and covers the welding connection part and the fuse part. The first insulating protective layer is arranged in one piece, which is conducive to simplifying the processing process, improving production efficiency and reducing production costs.

[0011] In some embodiments, the first insulating protective layer includes a first section covering the welding connection part and a second section covering the fuse part. The first section and the second section are arranged at intervals or the first section and the second section at least partially overlap. The first section and the second section are arranged at intervals, which is conducive to solving the problem of insulating protective layer materials and reducing production costs; the first section and the second section at least partially overlap, which increases the coverage area of ​​the insulating protective layer and helps prevent welding slag from falling. Furthermore, the first section and the second section are connected, which also increases the connection area and strength between the first insulating protective layer and the tab and / or the welding connection part, so it is conducive to maintaining the tab after the fuse in the posture before the break, so as to prevent the tab after the break from overlapping with the components of the battery cell to form a short circuit.

[0012] 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, thereby increasing the coverage area of ​​the first insulating protective layer and facilitating the prevention of welding slag from falling.

[0013] 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 break, so as to prevent the broken pole ear from overlapping with the components of the battery cell and forming a short circuit.

[0014] 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 lug and / or the pole. This is beneficial for maintaining the pole lug after the fuse in the posture before the break, so as to prevent the broken pole lug from overlapping with the components of the battery cell and forming a short circuit.

[0015] 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.

[0016] 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 pole ear after melting in the posture before breaking, so as to prevent the pole ear after breaking from overlapping with the components of the battery cell and forming a short circuit.

[0017] 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 components of the battery cell, and maintain the tab in the posture before the break after the fuse is blown to prevent the broken tab from overlapping the components of the battery cell to form a short circuit and damage the battery cell.

[0018] According to another aspect of the present application, a battery is provided, the battery comprising the above-mentioned battery cell.

[0019] According to another aspect of the present application, an electrical device is also provided, and the electrical device includes the above-mentioned battery.

[0020] By applying the technical solution of the present application, the insulating protective layer covers the welding connection part to prevent the welding slag of the welding connection part from falling off, which is helpful to prevent the welding slag from falling into the battery cell and causing wear or short circuit of the components of the battery cell. The insulating protective layer covers the fuse part of the pole ear. After the fuse part is melted, the insulating protective layer helps to maintain the pole ear in the posture before breaking to prevent the pole ear after breaking from overlapping with the components of the battery cell to form a short circuit and damage the battery cell. Even if the pole ear after breaking overlaps with the components of the battery cell, the insulating protective layer helps to prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0021] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 A schematic diagram showing the structure of an electric device in some embodiments of the present application is shown;

[0024] Figure 2 A schematic diagram showing the structure of a battery in some embodiments of the present application is shown;

[0025] Figure 3 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application is shown;

[0026] Figure 4 A cross-sectional view of a battery cell according to some embodiments of the present application is shown;

[0027] Figure 5 Shows Figure 4 An enlarged schematic diagram of point A;

[0028] Figure 6 An enlarged schematic diagram of a battery cell of another embodiment of the present application is shown;

[0029] Figure 7 An enlarged schematic diagram of a battery cell of another embodiment of the present application is shown;

[0030] Figure 8 The schematic diagrams of the structures of the tabs of other embodiments of the present application are shown. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0033] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0034] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present 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 vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0035] 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.

[0036] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0037] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, any of the following conditions satisfies the condition "A or B": 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).

[0038] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0039] In order to increase the space utilization rate inside the battery cell, many existing power batteries have removed the adapter and directly welded the electrode assembly to the top cover pole. Since there is no adapter, it is impossible to set a fuse area on the adapter. Therefore, when an external short circuit occurs in the battery cell, there is no pre-set fuse area in the overcurrent chain of the battery cell, and the overcurrent chain cannot be cut off, resulting in long-term high-current discharge of the entire battery cell, causing thermal runaway of the battery cell and causing safety problems. In order to solve the above problems, a fuse can be set on the pole ear. Specifically, a slot is punched out on the pole ear, or a missing portion with a slot is directly formed on the pole ear, and the remaining area is the fuse portion, so that the current flow section of the fuse portion is small and the resistance is relatively large, which is an area that is relatively easy to fuse. Therefore, when a short circuit occurs outside the battery cell connected to the pole ear, an instantaneous large current is generated inside the battery cell. Since the current flow section of the fuse portion of the pole ear is small and the resistance is relatively large, when the current passes through the fuse portion, the fuse portion fuses and terminates the short circuit process. The pole ear 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 components of the battery cell (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 pole ear is melted, the broken pole ear may overlap with the components of the battery cell to form a short circuit, resulting in a high-voltage arc, which leads to failure of the battery cell.

[0040] Based on the above considerations, in order to solve the problem that welding slag easily causes wear or short circuit of the battery cell and that the broken pole ear may overlap with the components of the battery cell to form a short circuit, the utility model author has designed a battery cell after in-depth research. The battery cell includes a pole and an electrode assembly. The electrode assembly includes a main body and a pole ear. The pole ear is connected to the pole through a welding connection part, and the pole ear is provided with a fuse part for overcurrent protection. Furthermore, the cell also includes an insulating protective layer that at least covers the welding connection part and the fuse part.

[0041] The insulating protective layer covers the welding connection to prevent the welding slag from falling off, which helps prevent the welding slag from falling into the battery cell and causing wear or short circuit of the components of the battery cell (such as the pole piece, the active material on the pole piece, and the insulating material layer). The insulating protective layer covers the fuse part of the pole ear. After the fuse part is blown, the insulating protective layer helps to maintain the pole ear in the posture before the break to prevent the broken pole ear from overlapping with the components of the battery cell to form a short circuit and damage the battery cell. Even if the broken pole ear overlaps with the components of the battery cell, the insulating protective layer helps to prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0042] Figure 1 FIG. 1 shows a schematic diagram of a structure of an electrical device using a battery as a power source; Figure 1As shown, the electrical equipment of this embodiment includes a vehicle 1000, which may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used 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.

[0043] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0044] like Figure 2 As shown, the battery 100 includes a box body 110 and a battery module disposed in the box body 110, and the battery module includes a plurality of battery cells 120, and the battery cells 120 are contained in the box body 110. Among them, the box body 110 is used to provide a storage space for the battery cells 120, and the box body 110 can adopt a variety of structures. In some embodiments, the box body 110 may include a first part 111 and a second part 112, and the first part 111 and the second part 112 cover each other, and the first part 111 and the second part 112 jointly define a storage space for accommodating the battery cells 120. The second part 112 may be a hollow structure with one end open, and the first part 111 may be a plate-like structure, and the first part 111 covers the open side of the second part 112, so that the first part 111 and the second part 112 jointly define a storage space; the first part 111 and the second part 112 may also be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 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.

[0045] 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 mixed connection. A mixed connection means that the multiple battery cells 120 are both connected in series and in parallel. The multiple battery cells 120 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 120 is accommodated in the box 110; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 120 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 110. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 120.

[0046] Each battery cell 120 may be a secondary battery or a primary battery, or 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.

[0047] Combination Figures 3 to 7 As shown, in some embodiments, the battery cell 120 includes a shell 4 , a pole 5 , a battery cell 2 , an end cover 3 and a pole ear 1 .

[0048] The battery cell 2 is arranged in the housing 4. The end cap 3 is arranged on the open end of the housing 4. The pole 5 passes through the end cap 3, and the end of the pole 5 located on the inner side of the end cap 3 is connected to the battery cell 2 through the pole ear 1. The end of the pole 5 located on the outer side of the end cap 3 is used to connect to the pole of the electric device or other battery cells. In some embodiments, the pole ear 1 is integrated with the current collector of the battery cell 2.

[0049] 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 pole 5 is provided on the end cap 3 and can be used to electrically connect to the battery cell 2 to output or input electrical energy of the battery cell 120.

[0050] 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.

[0051] The battery cell 2 is a component where electrochemical reactions occur in the battery cell 120. The housing 4 may contain one or more battery cells 2. The battery cell 2 is mainly formed by winding or stacking pole sheets, wherein the pole sheets include a positive pole sheet and a negative pole sheet, and a separator is usually provided between the positive pole sheet and the negative pole sheet.

[0052] The electrode sheet mainly includes a thin sheet current collector and an active material coated on the current collector. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the battery cell assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear 1.

[0053] The battery cell includes a pole 5 and an electrode assembly. The electrode assembly includes a main body and a pole ear 1. The pole ear 1 is connected to the pole 5 through a welding connection 6. Figures 5 to 8 As shown, the first end 11 of the pole tab 1 is connected to the battery cell 2, and the second end of the pole tab 1 is connected to the pole post 5 through a welding connection. The pole tab 1 is provided with a fuse 13 for overcurrent protection. When the current of the battery cell exceeds the set current, the fuse 13 can be melted to protect the battery cell 2 of the battery cell from being damaged due to excessive current.

[0054] The second end 12 of the pole tab 1 is welded to the pole post 5. The welding slag generated by the welding may fall into the battery cell 2, causing wear or short circuit of the components of the battery cell 2 (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 part 13 of the pole tab 1 is melted, the broken pole tab 1 may overlap with the components of the battery cell 2 to form a short circuit, generate a high-voltage arc, and cause the battery cell 2 to fail.

[0055] In order to improve the above-mentioned problem, the electrode assembly of the present embodiment further includes an insulating protective layer 7 , and the insulating protective layer 7 at least covers the welding connection portion 6 and the fuse portion 13 .

[0056] The insulating protective layer 7 covers the welding connection part 6 to prevent the welding slag of the welding connection part 6 from falling off, which is helpful to 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 pole piece, the active material on the pole piece, and the insulating material layer). The insulating protective layer 7 covers the fuse part 13 of the pole ear 1. After the fuse part 13 is melted, the insulating protective layer 7 is helpful to maintain the pole ear 1 in the posture before the break to prevent the broken pole ear 1 from overlapping with the components of the battery cell 2 to form a short circuit and damage the battery cell 2. Even if the broken pole ear 1 overlaps with the components of the battery cell 2, the insulating protective layer 7 is also helpful to prevent the battery cell from short circuiting, thereby improving the safety of the battery.

[0057] In some embodiments, see Figures 5 to 7 The insulating protective layer 7 includes a first insulating protective layer 71 , and 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 .

[0058] The pole 5 is located above the battery cell 2, the first end 11 of the pole tab 1 is connected to the battery cell 2, and the second end 12 of the pole tab 1 is welded to the lower surface of the pole 5. The fuse 13 of the pole tab 1 is located between the first end 11 of the pole tab 1 in the length direction and the second end 12 opposite to the first end.

[0059] The first insulating protective layer 71 covers the side of the welding connection part 6 away from the pole 5 and the first side of the fuse part 13. It is helpful to prevent the welding slag of the welding connection part 6 from falling into the battery cell 2 to cause wear or short circuit of the components of the battery cell 2, and it is also helpful to maintain the pole ear 1 after the fuse in the posture before the break, so as to prevent the pole ear 1 after the break from overlapping with the components of the battery cell 2 to form a short circuit. Even if the pole ear 1 after the break forms an overlap with the components of the battery cell 2, the insulating protective layer 7 is also helpful to prevent the battery cell 2 from short circuiting, thereby improving the safety of the battery.

[0060] In some embodiments, see Figure 5 and 6 The first insulating protective layer 71 is integrated and covers the welding connection part 6 and the fuse part 13. The first insulating protective layer 71 is arranged in one piece, which is conducive to simplifying the processing process, improving production efficiency and reducing production costs.

[0061] In some embodiments, see Figure 7 The first insulating protective layer 71 includes a first section 711 covering the welding connection portion 6 and a second section 712 covering the fuse portion 13. The first section 711 and the second section 712 are arranged at intervals, which is beneficial to solving the insulating protective layer material and reducing production costs.

[0062] 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 use a material with a melting point and / or stiffness greater than that of the first section 711, so as to maintain the pole ear 1 in its original posture after the fuse part 13 is blown, so as to prevent the broken pole ear 1 from overlapping with the components of the battery cell 2 to form a short circuit.

[0063] 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, which is beneficial to preventing the falling of welding slag. Furthermore, the first section 711 and the second section 712 are connected, which also increases the connection area and strength between the first insulating protective layer 71 and the tab and / or the welding connection portion 6, thereby facilitating the maintenance of 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.

[0064] In some embodiments, see Figure 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, which increases the coverage area of ​​the first insulating protective layer 71 and helps prevent the falling of welding slag.

[0065] 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 pole ear 1 after the fuse in the posture before the break, so as to prevent the pole ear 1 from overlapping with the components of the battery cell 2 after the break and forming a short circuit.

[0066] 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.

[0067] 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 break, so as to prevent the tab 1 after the break from overlapping with the components of the battery cell 2 to form a short circuit.

[0068] In some embodiments, the insulating protective layer includes an insulating rubber layer, a polyethylene terephthalate (PET) material film, and a polyimide (PI) material film. The material of the insulating protective layer can effectively prevent welding slag from falling into the battery cell 2 to cause wear or short circuit of the components of the battery cell, and maintain the tab 1 in the posture before the break after the fuse 13 is melted to prevent the broken tab 1 from overlapping with the components of the battery cell 2 to form a short circuit and damage the battery cell.

[0069] The above description is only an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: Pole (5); An electrode assembly, comprising a main body and a pole ear (1), wherein the pole ear (1) is connected to the pole column (5) via a welding connection portion (6), and the pole ear (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, characterized in that: The insulating protective layer (7) comprises a first insulating protective layer (71), wherein 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).

3. The battery cell according to claim 2, characterized in that: The first insulating protective layer (71) is integrated and covers the welding connection portion (6) and the fuse portion (13).

4. The battery cell according to claim 2, characterized in that: The first insulating protective layer (71) comprises a first section (711) covering the welding connection portion (6) and a second section (712) covering the fuse portion (13), the first section (711) and the second section (712) being arranged at intervals or the first section (711) and the second section (712) at least partially overlapping.

5. The battery cell according to claim 2, characterized in that: The first insulating protective layer (71) protrudes from the welding connection portion (6) and covers the pole (5).

6. The battery cell according to claim 2, characterized in that: 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 claim 6, characterized in that: The second insulating protective layer (72) protrudes from the fuse portion (13) and covers the pole (5).

8. The battery cell according to claim 1, characterized in that: The electrode 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 electrode 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, characterized in that: The insulating protective layer includes one of an insulating adhesive layer, a polyethylene terephthalate material film and a polyimide material film.

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

11. An electrical device, characterized in that: Comprising the battery as claimed in claim 10.

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