A battery monomer, a battery and an electric device

Abstract

The utility model relates to battery technical field, specifically provide a kind of battery monomer, battery and electric equipment, comprising: cover, with abutting portion and boss. Abutting portion has first abutting face, boss is connected in abutting portion, and boss protrudes from first abutting face. First abutting face is in abutment in the open end of shell, and boss is inserted into shell. Abutting portion and shell welding form welded part. Insulating part, including main body, connecting portion and turnover portion. Cover, main body and turnover portion are sequentially arranged along first direction, main body is connected to cover, and both ends of main body along second direction are connected by connecting portion and turnover portion. First direction is the height direction of shell, and second direction is the length direction of shell. Wherein, boss and connecting portion abut;And along first direction, the junction of connecting portion and turnover portion is opposite boss setting. The utility model solves the problem that secondary battery is easily burnt out when laser welding in shell cover.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] With the widespread use of rechargeable batteries in automobiles, home storage, and other fields, the requirements for the safety and reliability of rechargeable batteries are becoming increasingly stringent. The current competitive market environment also requires battery manufacturers to have a relatively high manufacturing yield.

[0003] The outer casing of a secondary battery typically consists of a top cover and an aluminum shell welded together to protect the bare battery cells inside. Laser welding is the commonly used welding method. However, during laser welding of the casing, laser leakage can occur. This leakage can easily burn the battery core or the plastic sealant under the top cover. The plastic sealant under the top cover is an insulating component between the battery top cover and the core; damage to this sealant can lead to insulation failure and potentially cause safety issues for the battery cells.

[0004] There is currently no effective solution to the problem that laser leakage during laser welding of secondary batteries can easily burn the battery core or the plastic under the top cover. Utility Model Content

[0005] The present invention provides a battery cell, a battery, and an electrical device, which at least solves the problem that laser leakage during the laser welding of the casing of a secondary battery can easily burn the battery core or the plastic under the top cover.

[0006] This utility model provides a battery cell, comprising: a housing having an open end along a first direction; A cover plate has abutting portion and a boss; the abutting portion has a first abutting surface; the boss is connected to the abutting portion and protrudes from the first abutting surface; the first abutting surface abuts against the opening end of the housing, and the boss is inserted into the housing; the abutting portion and the housing are welded to form a welded portion; An insulating component includes a main body, a connecting part, and a flipping part; the cover plate, the main body, and the flipping part are arranged sequentially along a first direction; the main body is connected to the cover plate; both ends of the main body along a second direction are connected through the connecting part and the flipping part; the first direction is the height direction of the housing, and the second direction is the length direction of the housing; The boss and the connecting part abut against each other; and along the first direction, the connection point between the connecting part and the flipping part is positioned opposite the boss.

[0007] In one embodiment of the present invention, the connecting portion includes a first segment, which is connected to the main body portion. The first segment has a second abutting surface disposed toward the boss. The second abutting surface is in close contact with the boss.

[0008] In one embodiment of the present invention, the connecting portion further includes a second portion connected to the first portion, the second portion protruding from the second abutting surface; the second portion and the flip portion are foldable and connected; wherein, along the first direction, the boss and the second portion abut against each other.

[0009] In one embodiment of the present invention, the second segment has a first inclined surface on the side opposite to the flipping part, and the boss has a second inclined surface that abuts against the first inclined surface.

[0010] In one embodiment of the present invention, the abutting portion includes a third inclined surface connected to the first abutting surface; at least a portion of the welded portion is formed between the third inclined surface and the opening end.

[0011] In one embodiment of this utility model, it further includes: an electrode assembly housed within the housing; the electrode assembly includes a battery cell body and a tab, the tab being disposed on the side of the battery cell body facing the cover plate, and the end of the tab away from the battery cell body being located between the flip portion and the main body portion; wherein, the flip portion has a third segment connected to the connecting portion, the third segment having a first through hole extending along the first direction, the connecting portion having a second through hole extending along the second direction, the first through hole and the second through hole communicating; wherein, along the second direction, there is a first gap between the battery cell body and the housing; both the second through hole and the first through hole communicate with the first gap.

[0012] In one embodiment of this utility model, a groove is formed in the side of the boss away from the first abutment surface, and the end of the groove near the connecting part passes through the boss; the groove and the second through hole are connected.

[0013] In one embodiment of this utility model, the bottom of the groove is located closer to the battery cell body than the first abutment surface.

[0014] In one embodiment of the present invention, a battery is provided, the battery comprising the aforementioned battery cell.

[0015] In one embodiment of this utility model, an electrical device is provided, the electrical device comprising the battery described above.

[0016] This utility model provides a battery cell with a boss and abutment on its cover plate. The boss is inserted into the housing, and the abutment is welded to it, connecting the battery cell to the housing. The insulator's connecting portion abuts against the boss, which effectively prevents the insulator from expanding and deforming in humid or electrolyte environments over long periods. Most importantly, the boss isolates the welded portion between the abutment and the housing from the insulator and other components. During laser welding, laser leakage cannot damage the insulator and other components, improving the safety and yield of the battery cell. A battery and electrical device are also provided, incorporating all the beneficial effects of the aforementioned battery cell. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the cover surface of a battery cell in an embodiment of this utility model.

[0018] Figure 2 yes Figure 1 One of the schematic diagrams of the cross section of region a1 in the width direction of the shell.

[0019] Figure 3 yes Figure 1 A schematic diagram of the cross-section of region a1 along the length of the shell.

[0020] Figure 4 This is a schematic diagram of the structure of a boss in an embodiment of this utility model.

[0021] Figure 5 yes Figure 1 The second schematic diagram of the cross-section of region a1 in the width direction of the shell.

[0022] Figure 6 This is a schematic diagram of the battery structure in an embodiment of this utility model.

[0023] Figure 7 This is a schematic diagram of the structure of the battery pack in an embodiment of this utility model.

[0024] Figure 8 This is a schematic diagram of the electrical equipment in an embodiment of this utility model.

[0025] The above figures include the following reference numerals: X—First direction; Y—Second direction; 1—Cover plate; 11—Abutting part; 111—First abutting surface; 112—Third inclined surface; 12—Boss; 121—Second inclined surface; 122—Groove; 2—Insulating component; 21—Main body; 22—Connecting part; 221—First section; 2211—Second abutting surface; 222—Second section; 2221—First inclined surface; 223—Second through hole; 23—Flipping part; 231—Third section; 2311—First through hole; 3—Battery; 4—Battery pack; 5—Electrical equipment; 6—Housing; 7—Welding part; 8—Electrode assembly. Detailed Implementation

[0026] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0029] It should be noted that in the structural design of secondary batteries, the outer casing typically serves as the first line of defense protecting the internal bare cells. Its core functions are to isolate external impurities such as moisture and dust, prevent electrolyte leakage, and withstand internal pressure changes and external mechanical shocks during the charging and discharging process. Currently, the mainstream casing structure consists of a metal top cover and an aluminum shell. Due to its superior material properties, aluminum has become the preferred casing material for medium- and large-capacity secondary batteries. The top cover integrates key functional components such as terminals, explosion-proof valves, and electrolyte filling holes, serving as the core hub for connecting the cells to the external circuitry and for safe pressure relief. The quality of this connection directly determines the protective performance of the casing.

[0030] The electrode assembly, as the energy core of the secondary battery, is composed of alternating positive electrode plates, negative electrode plates, and separators. The plastic under the top cover, located between the top cover metal sheet and the core, is usually made of modified polypropylene or nylon. Its core function is to isolate the conductive contact between the top cover metal sheet and the positive electrode of the core, preventing the positive current from short-circuiting to ground through the top cover shell.

[0031] During the laser welding process of the battery cover, laser leakage can cause the electrode components and the plastic under the cover to fail directly. Therefore, for the manufacturing of secondary batteries, laser leakage during laser welding not only directly threatens the safety of the battery cell, but also seriously affects production efficiency and cost control.

[0032] In related technologies, laser leakage during laser welding of the secondary battery casing can easily burn the battery core or the plastic under the top cover, and no effective solution has yet been proposed for this.

[0033] For the above technical issues, please refer to Figures 1 to 3 As shown, this utility model provides a battery cell, including a housing 6, a cover plate 1, and an insulating component 2. The cover plate 1 of the novel structure, when connected to the housing 6 by welding, can be used to protect the insulating component 2.

[0034] Specifically, the housing 6 has an open end along the first direction X, which is configured to connect with the cover plate 1. Since the cover plate 1 will house an explosion-proof valve, if the cover plate 1 is too thin, it will hinder the installation and fixation of the explosion-proof valve and make it difficult to ensure a successful explosion at the valve. Furthermore, since part of the cover plate 1 is embedded within the housing 6, if the cover plate 1 is too thick, it will inevitably occupy more internal space in the housing 6 and increase the weight of the battery cell. Therefore, the thickness of the cover plate 1 is 1.5 mm to 2.5 mm, which ensures both the safety of the explosion-proof valve and the energy density and weight of the battery cell in case of explosion. For example, the thickness of the cover plate 1 may be 1.5 mm, 1.7 mm, 2 mm, 2.2 mm, or 2.5 mm.

[0035] The cover plate 1 has abutment portion 11 and boss 12, with boss 12 connected to abutment portion 11. Understandably, the cover plate 1 also has a main plate, on which a pole, injection port, and / or explosion-proof valve are provided; boss 12 is formed on the entire circumference of the main plate, and abutment portion 11 is formed on the entire circumference of boss 12. The abutment portion 11 has a first abutment surface 111, and boss 12 protrudes from the first abutment surface 111. Understandably, the first abutment surface 111 is used to abut against the open end of housing 6, and boss 12 is used to insert into the open end of housing 6.

[0036] When the cover plate 1 needs to be closed on the housing 6, along the first direction X, the cover plate 1 moves towards the housing 6. First, the protrusion 12 of the cover plate 1 is inserted into the housing 6 from the opening formed at the opening end. When the first abutting surface 111 of the cover plate 1 and the end face formed at the opening end come into contact, the closing of the cover plate 1 and the housing 6 is completed. Here, the first direction X is the height direction of the housing 6.

[0037] The aforementioned boss 12 is integrally formed from the cover plate 1. Preferably, in this embodiment, the boss 12 is integrally stamped, that is, stamping is performed on the side of the cover plate 1 away from the inside of the housing 6, thereby forming a groove on the side of the cover plate 1 away from the inside of the housing 6, and a protrusion is formed on the cover plate 1 facing the inside of the housing 6 and directly opposite the groove.

[0038] In other embodiments, the integral molding process can also be integral die casting, integral casting, or other integral molding processes.

[0039] After the cover plate 1 and the housing 6 are closed, laser welding is used to fix the cover plate 1 and the housing 6. Therefore, the abutment part 11 and the housing 6 are welded to form the welded part 7. It can be understood that the welded part 7 is formed at the abutment of the first abutment surface 111 and the end face of the opening end.

[0040] Since the boss 12 is formed on the entire circumference of the motherboard and protrudes from the first abutment surface 111 towards the interior of the housing 6, it can block the laser from entering through the connection between the first abutment surface 111 and the opening during laser welding, thus preventing damage to other components. The battery cell generally also includes an electrode assembly 8 disposed within the housing 6. To isolate the electrode assembly 8 from the cover plate 1 and ensure their insulation, an insulating member 1 is typically provided on the side of the cover plate 1 facing the electrode assembly 8. The insulating member 1 is usually made of plastic, which is easily deformed and not heat-resistant. In existing technologies, the insulating member 2 is easily damaged by laser leakage during laser welding. Therefore, in this embodiment, the insulating member 2 can cooperate with the boss 12 to avoid damage caused by laser leakage.

[0041] In this embodiment, the insulating member 2 mainly includes a main body 21, a connecting part 22, and a flipping part 23. The cover plate 1, the main body 21, and the flipping part 23 are arranged sequentially along the first direction X. The main body 21 is connected to the cover plate 1. It is understood that the portion of the boss 12 protruding from the first abutment surface 111 forms an accommodating space, within which the main body 21 is accommodated, and one side of the main body 21 along the first direction X contacts the cover plate 1. Both ends of the main body 21 along the second direction Y are connected to the flipping part via the connecting part 22, where the second direction Y is the length direction of the housing 6. The connecting part 22 abuts against the boss 12, and along the first direction X, the connection point between the connecting part 22 and the flipping part 23 is directly opposite the boss 12. It is understood that the boss 12 not only does not hinder the flipping part 23 from flipping relative to the connecting part 22, but also allows it to abut against the connecting part 22.

[0042] In summary, the battery cell provided by this utility model has a cover plate 1 with a boss 12 and abutment 11. The boss 12 is inserted into the housing 6, and the abutment 11 abuts against the housing 6 and is welded at the abutment point, so that the cover plate 1 is connected to the housing 6. The insulating component 2 is blocked by the boss 12 and the abutment 11, which can prevent the laser from damaging it during the laser welding process, thereby improving the safety and yield of the battery cell. In addition, since the connecting part 22 of the insulating component 2 abuts against the boss 12, it can effectively limit the expansion of the insulating component in a humid or electrolyte environment for a long time, so as to prevent the housing 6 from deforming or even breaking.

[0043] In some embodiments, the connecting portion 22 is divided into different segments, mainly including a first segment 221 and a second segment 222. The first segment 221 is connected to the main body portion 21, that is, the first segment 221 is accommodated within the accommodating space. The first segment 221 has a second abutting surface 2211 disposed along the second direction Y and facing the boss 12. The second abutting surface 2211 is in close contact with the boss 12. It can be understood that there is no gap between the second abutting surface 2211 and the boss 12 along the second direction Y, and they are abutting against each other. In this way, deformation of the insulating member 2 can be effectively prevented.

[0044] The second segment 222 connects the first segment 221 and the flipping part 23. Specifically, the main body 21, the first segment 221, the second segment 222 and the flipping part 23 are integrally formed, and a crease is formed between the flipping part 23 and the second segment 222 so that the flipping part 23 can be flipped relative to the second segment 222.

[0045] Of course, in some other cases, only the main body 21, the first segment 221 and the second segment 222 can be integrally formed, and the flipping part 23 and the second segment 222 can be connected by hinges, loose-fitting connections or other methods.

[0046] To ensure the proper setting of the folding part and to prevent the boss 12 from interfering with the folding part, thus affecting its folding, therefore, see... Figure 2 As shown, along the second direction Y, the second segment 222 protrudes from the second abutment surface 2211, and along the first direction X, the connection between the second segment 222 and the flipping part 23 is located in the space between the boss 12 and the electrode assembly 8.

[0047] Furthermore, considering that in order to prevent the electrode assembly 8 from moving around, the flipping part 23 will be designed to abut against the electrode assembly 8. Thus, in order to ensure the pressing effect, the second section 222 is designed to abut against the boss 12. In this way, when the battery cell is vibrated, the second section 222 and the cover plate 1 can be used directly to prevent the electrode assembly 8 from moving around, and the pressing effect is better.

[0048] Further, see Figure 2 As shown, considering that the second segment 222 and the boss 12 abut against each other, and that the insulating part expands in a humid or electrolyte environment for a long time, if the corner of the boss 12 abuts against the second segment 222, the corner of the boss 12 may easily damage the connecting part 22. Therefore, a first inclined surface 2221 is provided on the side of the second segment 222 away from the flipping part 23, and a corresponding second inclined surface 121 is provided on the boss 12. The first inclined surface 2221 on the second segment 222 and the second inclined surface 121 on the boss 12 are inclined to cooperate. In this way, it can be ensured that the second segment 222 will not be damaged by the corner of the boss 12.

[0049] In this design, the first inclined surface 2221 on the second segment 222 is angled to the plane containing the first abutment surface 111, with the angle ranging from 30° to 60°. To ensure perfect contact between the first inclined surface 2221 and the second inclined surface 121, the angle of the second inclined surface 121 of the boss 12 should be the same as that of the first inclined surface 2221. Specifically, the inclination angle of the first inclined surface 2221 can be 30°, 35°, 40°, 45°, 50°, 55°, or 60°.

[0050] Of course, in order to avoid the sharp edges of the boss 12 from damaging the insulating parts during long-term use, the boss 12 can also be designed to be an arc surface at the position corresponding to the first inclined surface 2221, that is, the arc surface and the first inclined surface 2221 abut against each other.

[0051] In some embodiments, during the laser welding process, the two structures welded together can be structurally designed to ensure a more stable connection between the cover plate 1 and the housing 6.

[0052] Therefore, refer to Figure 5As shown, a third inclined surface 112 connected to the first abutment surface 111 is provided on the abutment portion 11. When the open end of the housing 6 abuts against the first abutment surface 111, the third inclined surface 112 forms a certain angle with the end face of the open end. The presence of the third inclined surface 112 forms a connecting seam between the third inclined surface 112 and the end face of the open end. Thus, during the laser welding process, a laser can be emitted towards the connecting seam to weld the cover plate 1 and the housing 6. After the laser welding is completed, the connecting seam can accommodate part of the welded portion 7, making the cover plate 1 and the housing 6 firmly welded while also improving the overall aesthetics of the battery cell.

[0053] The third inclined surface 112 can be in the form of a plane, a trapezoidal surface, an arc surface, or other surface forms. In this embodiment, preferably, the third inclined surface 112 is a plane. Furthermore, the angle of inclination of the third inclined surface 112 relative to the first abutment surface 111 ranges from 30° to 60°. For example, the angle is 30°, 35°, 40°, 45°, 50°, 55°, or 60°. This not only increases the welding penetration but also ensures the overall aesthetics of the battery cell.

[0054] This embodiment of the utility model provides a battery cell, in which the electrode assembly 8 is disposed within the housing 6, and mainly includes the cell body and the tabs. The cell body is the core carrier for energy storage and conversion in the secondary battery, while the tabs are the only channel for current to enter and exit the cell; the two work together to realize the charging and discharging function of the battery.

[0055] The electrode tab is located on the side of the battery cell body facing the cover plate 1, and the end of the electrode tab away from the battery cell body is located between the flip part 23 and the main body part 21.

[0056] Reference Figure 4 As shown, the flipping part 23 is provided with a third section 231 for contacting the main body of the battery cell. The third section 231 is provided with a first through hole 2311, and the connecting part 22 is provided with a second through hole 223 that communicates with the first through hole 2311.

[0057] Specifically, the flipping part 23 is provided with a third segment 231, which is connected to the connecting part 22. Along the first direction X, a first through hole 2311 is provided through the third segment 231. Along the second direction Y, a second through hole 223 is provided through the connecting part 22 and communicates with the first through hole 2311.

[0058] Along the second direction Y, there is a first gap between the battery cell body and the housing 6, and the first through hole 2311 and the second through hole 223 are both connected to the first gap.

[0059] When thermal runaway occurs in the main body of the battery cell, the cell reacts violently, releasing a large amount of high-temperature gas. This gas is directly discharged into the first gap and converges at the explosion-proof valve through the first through-hole 2311 and the second through-hole 223. When the internal pressure exceeds the threshold of the explosion-proof valve, the valve opens, releasing the high-temperature gas. This reduces the pressure inside the battery, preventing secondary damage and fire caused by the explosion and rupture of the casing 6.

[0060] The first through hole 2311 should be located in the middle of the third segment 231 in the width direction. Positioning the first through hole 2311 in the middle ensures that high-temperature gas can accumulate at the explosion-proof valve most quickly, and also ensures the structural strength of the third segment 231 on both sides. The width of the first through hole 2311 is 0.2 to 0.4 times the width of the third segment 231, ensuring both exhaust and structural strength. For example, the width of the first through hole 2311 may be 0.2, 0.25, 0.3, 0.35, or 0.4 times the width of the third segment 231. Since the second through hole 223 communicates with the first through hole 2311, the width of the second through hole 223 is greater than or equal to the width of the first through hole 2311.

[0061] To prevent the boss 12 from obstructing gas from reaching the explosion-proof valve through the second through hole 223, and to allow high-temperature gas to accumulate at the explosion-proof valve more quickly and promptly, as an optional solution, refer to... Figure 4 and Figure 5 As shown, a groove 122 is provided on the boss 12, and the groove 122 is connected to the second through hole 223.

[0062] Specifically, the groove 122 is located on the side of the boss 12 away from the first abutment surface 111. The groove 122 extends through the boss 12 along the second direction Y to the side near the connecting portion 22, and also extends through the boss 12 along the first direction X to the side near the battery cell body. Thus, the second connecting hole communicates with the groove 122. The portion connecting the second section 222 and the folded portion is located within the groove 122, and the second inclined surface 121 connects the bottom surface of the groove 122 and the inner surface of the boss facing the insulating component.

[0063] When thermal runaway occurs in the main body of the battery cell, the cell reacts violently, releasing a large amount of high-temperature gas. The groove 122, connected to the second through hole 223, increases the emission path of the high-temperature gas during the emission process, and can better promote the discharge of a large amount of high-temperature gas. This further accelerates the reduction of internal pressure in the battery, avoiding secondary damage and fire caused by the explosion and rupture of the casing 6.

[0064] It is worth noting that, in order to ensure that the boss 12 blocks the laser, the bottom of the groove 122 is closer to the main body of the battery cell than the first abutment surface 111. In addition, in order to ensure that high-temperature gas can pass smoothly through the groove 122, the width of the groove 122 should be greater than the width of the second through hole 223 along the width direction of the cover plate 1.

[0065] Secondly, such as Figure 6 As shown, this utility model also provides a battery 3, including an electrode assembly 8, a casing 6, a cover plate 1, and an insulating component 2 of any of the aforementioned single-cell batteries. Multiple batteries 3 can be connected in series or parallel to form a configuration such as... Figure 7 The battery pack 4 shown here supplies power to the electrical equipment 5.

[0066] Thirdly, this utility model also provides an electrical device, including the aforementioned battery 3 or battery pack 4. The electrical device 5 can be, but is not limited to, devices that require power supply, such as aircraft, vehicles, ships, power tools, electric toys, and electronic devices.

[0067] For example, such as Figure 8 As shown, electrical device 5 is a vehicle. Batteries can power the electronic devices on the vehicle, as well as the vehicle's power system. Similarly, to provide sufficient power to the vehicle, batteries 3 are typically combined into a battery pack 4 to provide more power to the vehicle.

[0068] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0069] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0070] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing has an open end along a first direction; The cover plate (1) has abutment (11) and boss (12); the abutment (11) has a first abutment surface (111); the boss (12) is connected to the abutment (11) and protrudes from the first abutment surface (111); the first abutment surface (111) abuts against the opening end of the housing, and the boss (12) is inserted into the housing; the abutment (11) and the housing are welded to form a welded part; The insulating component (2) includes a main body (21), a connecting part (22), and a flipping part (23); the cover plate (1), the main body (21), and the flipping part (23) are arranged sequentially along the first direction; the main body (21) is connected to the cover plate (1); both ends of the main body (21) along the second direction are connected by the connecting part (22) and the flipping part (23); the first direction is the height direction of the housing, and the second direction is the length direction of the housing; The boss (12) and the connecting part (22) abut against each other; and along the first direction, the connection point of the connecting part (22) and the flipping part (23) is positioned opposite the boss (12).

2. The battery cell according to claim 1, characterized in that, The connecting part (22) includes a first segment (221), which is connected to the main body (21). The first segment (221) has a second abutting surface (2211) facing the boss (12). The second abutting surface (2211) and the boss (12) are in close contact.

3. The battery cell according to claim 2, characterized in that, The connecting part (22) further includes a second part (222) connected to the first part (221), the second part (222) protruding from the second abutting surface (2211); the second part (222) and the flipping part (23) are foldable and connected; wherein, along the first direction, the boss (12) and the second part (222) abut.

4. The battery cell according to claim 3, characterized in that, The second segment (222) has a first inclined surface (2221) on the side opposite to the flipping part (23), and the boss (12) has a second inclined surface (121) that abuts against the first inclined surface (2221).

5. The battery cell according to any one of claims 1 to 4, characterized in that, The abutment portion (11) includes a third inclined surface (112) connected to the first abutment surface (111); at least a portion of the welded portion is formed between the third inclined surface (112) and the opening end.

6. The battery cell according to any one of claims 1 to 4, characterized in that, Also includes: An electrode assembly is housed within the housing; the electrode assembly includes a battery cell body and a tab, the tab being disposed on the side of the battery cell body facing the cover plate (1), and the end of the tab away from the battery cell body being located between the flip portion (23) and the main body portion (21); The flipping part (23) has a third section (231) connected to the connecting part (22). The third section (231) has a first through hole (2311) that extends through the first direction. The connecting part (22) has a second through hole (223) that extends through the second direction. The first through hole (2311) and the second through hole (223) are connected. Along the second direction, there is a first gap between the battery cell body and the housing. The second through hole (223) and the first through hole (2311) are both connected to the first gap.

7. The battery cell according to claim 6, characterized in that, The boss (12) has a recessed groove (122) on the side away from the first abutment surface (111), and the end of the groove (122) near the connecting part (22) passes through the boss (12); the groove (122) and the second through hole (223) are connected.

8. The battery cell according to claim 7, characterized in that, The bottom of the groove (122) is closer to the battery cell body than the first abutment surface (111).

9. A battery, characterized in that, The battery comprises a battery cell as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, The electrical device includes the battery as described in claim 9.

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