Battery cell, battery, and electric device

Abstract

The application discloses a battery monomer, a battery and an electric equipment, which comprise a shell, a cover plate, an electric core and an insulating piece, wherein the shell has a containing cavity, the shell is provided with an opening communicating with the containing cavity; the cover plate closes the opening; the electric core is arranged in the containing cavity; a convex part of the insulating piece abuts against one end of a main body of the electric core which is arranged towards the cover plate, and the convex part and the root of a tab of the electric core are arranged in a first direction; in a third direction, a groove is formed in a side of the convex part away from the main body; a first groove bottom surface of the groove is arranged in an inclined mode; a first through hole communicating with the lowest point of the first groove bottom surface is arranged in the groove; and the first through hole communicates the groove and the containing cavity. It can be seen that the convex part of the insulating piece abutting against the main body can support the cover plate, so that the situation that the battery has only one side with a bent tab and the other side lacks a tab to pull the cover plate to cause the situation of suspension does not occur after the battery is put into the shell; meanwhile, electrolyte in the groove can flow into the containing cavity, so that the situation of electrolyte accumulation does not occur.

Description

Technical Field

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

[0002] In the current power battery industry, in order to increase capacity space, a single-core battery has been designed, that is, the number of cores is one. However, after the single-core battery is installed in the casing, only one side has a bent tab, and the other side lacks a tab to pull the top cover, which is in a suspended state. This results in uneven stress on the top cover and frequent damage to the aluminum casing during pre-welding and pressing, which seriously affects the battery installation efficiency and yield.

[0003] Therefore, providing a battery that can solve the problem of uneven force distribution caused by the top cover being suspended is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell that can solve the problem of uneven stress caused by the battery top cover being suspended. In addition, this application also provides a battery including the above-mentioned battery cell and an electrical device including the battery. A single battery cell, comprising: A housing having a receiving cavity, and the housing having an opening communicating with the receiving cavity on at least one side along a third direction; Cover plate, to close the opening; A battery cell is placed in the receiving cavity. The battery cell has a body and a tab. The tab has a root and the root is connected to an end of the body facing the cover plate. An insulating component is disposed on the side of the cover plate facing the battery cell; the insulating component has a protrusion; the protrusion abuts against the end of the main body facing the cover plate, and the protrusion and the root of the electrode tab are spaced apart along a first direction; along a third direction, the side of the protrusion facing away from the main body is recessed to form a groove; the first direction is the width direction of the housing; the third direction is the height direction of the housing; The groove has an inclined first bottom surface, and the first bottom surface has a first end and a second end that are opposite to each other along the inclined direction; along the third direction, the first end is closer to the main body than the second end; The protrusion is provided with a first through hole, which is located on the side of the first end away from the second end along the inclined direction of the bottom surface of the first groove; the first through hole connects the groove and the receiving cavity; Along the third direction, at least a portion of the hole wall height of the first through hole is not higher than the height of the first end.

[0005] Optionally, in the above-mentioned battery cell, along the first direction, an opening is formed on the side of the protrusion away from the root of the tab, and the opening communicates with the groove.

[0006] Optionally, in the above-mentioned battery cell, the opening is the first through hole; the groove has a bottom wall, and along the third direction, the side surface of the bottom wall opposite to the main body is the first bottom surface of the groove.

[0007] Optionally, in the above-mentioned battery cell, the bottom surface of the first groove is provided with a third through hole penetrating the protrusion.

[0008] Optionally, in the above-mentioned battery cell, the angle range between the tilt direction of the bottom surface of the first groove and the dummy horizontal plane is 2°-20°, and the dummy horizontal plane is perpendicular to the third direction.

[0009] Optionally, in the above-mentioned battery cell, the insulating element includes: The first insulating part is connected to the cover plate; The second insulating part is located on the side of the first insulating part facing the main body; one end of the second insulating part along a second direction is rotatably connected to the first insulating part; the second direction is the length direction of the housing; The electrode tab includes a bent portion and a connecting portion, the connecting portion being located between the second insulating portion and the first insulating portion, and the connecting portion and the root portion being connected through the bent portion; the second insulating portion has the protrusion.

[0010] Optionally, in the above-mentioned battery cell, the cover plate is provided with a terminal post; the connecting part of the electrode tab is connected to the terminal post through an adapter piece, and along the third direction, the end of the protrusion away from the main body abuts against the adapter piece or the first insulating part.

[0011] Optionally, in the above-mentioned battery cell, the second insulating portion includes a substrate and the protrusion, the protrusion being connected to the substrate; the substrate has a first surface disposed toward the cover plate and a second surface disposed away from the first surface along its thickness direction, a portion of the protrusion protruding from the first surface of the substrate, and another portion of the protrusion protruding from the second surface of the substrate; The portion of the protrusion that extends beyond the first surface of the substrate is provided with a second through hole, which connects the groove and the receiving cavity.

[0012] A battery comprising the aforementioned battery cell.

[0013] An electrical device comprising the aforementioned battery.

[0014] As can be seen from the above technical solution, the protrusions and the roots of the tabs in the insulating components of the single cell, battery, and electrical equipment provided in this application are spaced apart along the first direction, and the protrusions abut against the end of the cell body facing the cover plate. Given the bending of the tabs, the abutment between the protrusions and the cover plate and the body can support the cover plate, preventing the side of the cover plate not connected to the tabs from being suspended, thus preventing the cover plate from tilting and preventing damage to the casing and cell during the cell pressing process, ensuring efficient casing insertion. Simultaneously, the grooves on the protrusions are connected to the receiving cavity through the first through hole, which facilitates better flow of electrolyte into the receiving cavity, allowing the electrolyte to fully wet the cell body and preventing some electrolyte residue from remaining in the grooves. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0016] Figure 2 A front view of the cover plate and insulating component provided in an embodiment of this application.

[0017] Figure 3 A bottom view of the cover plate and insulating component provided in an embodiment of this application.

[0018] Figure 4 This is a schematic diagram of the cover plate and insulating component provided in an embodiment of this application.

[0019] Figure 5 This is a cross-sectional view of the insulating component provided in an embodiment of this application along a first direction.

[0020] Figure 6 This is a schematic diagram of the structure of the insulating component provided in an embodiment of this application.

[0021] Figure 7 A cross-section of the bottom wall of the groove provided in the embodiments of this application. Figure 1 .

[0022] Figure 8 A cross-section of the bottom wall of the groove provided in the embodiments of this application. Figure 2 .

[0023] in: 1. Cover plate; 2. Battery cell; 21. Main body; 22. Electrode tab; 3. Insulating component; 31. Protrusion; 32. Groove; 321. Groove bottom wall; 322. First side wall; 323. Second side wall; 324. Opening; 33. First insulating portion; 34. Second insulating portion; 341. Substrate; 35. Second through hole; 36. Fourth through hole; 4. Pole post. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] like Figures 1 to 8 As shown in the figure, this application provides a single battery cell that can solve problems such as uneven force distribution caused by the battery top cover being suspended.

[0027] First, the battery cell includes a casing, a cover plate 1, a battery cell 2, and an insulating component 3. The casing has a receiving cavity, and at least one side of the casing along a third direction has an opening communicating with the receiving cavity. The cover plate 1 closes the opening. The battery cell 2 is placed in the receiving cavity. The battery cell 2 has a body 21 and a tab 22. The tab 22 extends from the body 21 and has a root. The root is connected to the end of the body 21 facing the cover plate 1. The insulating component 3 is located on the side of the cover plate 1 facing the battery cell 2. The insulating component 3 has a protrusion 31. The protrusion 31 abuts against the end of the body 21 facing the cover plate 1. The protrusion 31 and the root of the tab 22 are spaced apart along a first direction. The protrusion 31 abuts between the cover plate 1 and the body 21 and can support the cover plate 1. This solves the problem that after the battery cell 2 enters the casing, one side bends the tab 22, while the other side lacks the tab 22 and pulls the cover plate 1, resulting in a suspended state. This causes uneven stress on the cover plate 1 and frequent damage to the casing during pre-welding and pressing. The first direction refers to the width direction of the shell. See the diagram for a detailed representation of the first direction. Figure 1 .

[0028] Along the third direction, the protrusion 31 is recessed on the side opposite to the main body 21 to form a groove 32; the third direction is the height direction of the shell, and a schematic diagram of the third direction is shown in [reference needed]. Figure 1 The groove 32 has an inclined first bottom surface, with a first end and a second end positioned opposite each other along the inclined direction. Along a third direction, the first end is closer to the main body 21 than the second end. The protrusion 31 has a first through hole, located on the side of the first end away from the second end along the inclined direction of the first bottom surface. The first through hole connects the groove 32 and the receiving cavity. Along a third direction, the height of at least a portion of the hole wall of the first through hole is not higher than the height of the first end. That is, the bottom surface of the first groove is a sloping surface, allowing the electrolyte in the groove 32 to flow along the slope and converge at a lower elevation along a third direction within the groove 32. The first through hole is located at at least the lowest elevation position, facilitating timely discharge of the electrolyte that has converged at this position, thus preventing a large area of ​​electrolyte residue from remaining if the bottom surface of the first groove were flat. It should be noted that when the lowest point of elevation is located at the edge of the bottom surface of the first groove 32, the first through hole can be a through hole that penetrates the bottom surface of the first groove, or a through hole that penetrates the side wall of the groove 32, or it can be located at the junction of the bottom surface and the side wall of the first groove.

[0029] like Figure 7 As shown, the inclined bottom surface of the first trench can form a single-slope structure; as Figure 8 As shown, the inclined bottom surface of the first groove can also form a double-slope structure. However, it is not limited to this. The bottom surface of the first groove can also be inclined towards the first through hole from various positions. That is, when the first through hole is located in the middle of the horizontal plane of the bottom surface of the first groove, the bottom surface of the first groove is a conical surface.

[0030] As can be seen, in this embodiment, the protrusion 31 of the insulating member 3 and the root of the tab 22 are spaced apart along the first direction, and the protrusion 31 abuts against the end of the main body 21 of the cell 2 facing the cover plate 1. Based on the bending of the tab 22, the protrusion 31 abuts between the cover plate 1 and the main body 21, which can play the role of supporting the cover plate 1. This can prevent the side of the cover plate 1 not connected to the tab 22 from being suspended, thereby preventing the cover plate 1 from tilting and preventing the cover plate 1 from damaging the housing and the cell 2 during the process of pressing the cell 2 into the housing, ensuring the efficiency of housing insertion. At the same time, the groove 32 on the protrusion 31 is connected to the receiving cavity through the first through hole, which can promote the electrolyte to flow better into the receiving cavity, so that the electrolyte can fully wet the body of the cell 2 and prevent some electrolyte from remaining in the groove 32.

[0031] In a specific implementation, along the first direction, an opening 324 is formed on the side of the protrusion 31 away from the root of the tab 22, and the opening 324 communicates with the groove 32. The opening 324 enables communication between the groove 32 and the receiving cavity, allowing the electrolyte in the groove 32 to flow into the receiving cavity through the opening 324, thus preventing electrolyte residue from remaining in the groove 32. Simultaneously, the bottom wall 321 of the groove 32 provides support, and the presence of the opening 324 also reduces the weight of the protrusion 31 on which the groove 32 is located. However, this is not a limitation; the opening 324 can also be formed on the side of the protrusion 31 closer to the root of the tab 22.

[0032] In some embodiments, the sidewalls of the groove 32 include a first sidewall 322 and two second sidewalls 323; the first sidewall 322 extends along a second direction; the second sidewalls 323 are located at both ends of the first sidewall 322 along the second direction. The bottom wall 321 of the groove 32 and the two second sidewalls 323 form an opening 324 on the side facing away from or close to the root of the tab 22 along the first direction. The opening 324 is not a first through hole. The first through hole is located at the lowest elevation position in the groove 32 to connect the groove 32 and the receiving cavity.

[0033] In specific implementation, the sidewall of the groove 32 is provided with a fifth through hole that penetrates the sidewall, increasing the communication area between the groove 32 and the receiving cavity, so that the electrolyte in the groove 32 can flow into the receiving cavity quickly.

[0034] In specific implementation, the opening 324 is the first through hole; the groove 32 has a bottom wall 321, and along the third direction, the side surface of the bottom wall 321 facing away from the main body 21 is the first bottom surface of the groove. The lowest point of the first bottom surface of the groove is located near the opening 324, so that the electrolyte in the groove 32 can flow from the opening 324 to the body of the cell 2 in the receiving cavity.

[0035] In some embodiments, the sidewall of the groove 32 includes a first sidewall 322 and two second sidewalls 323; the first sidewall 322 extends along a second direction; the second sidewalls 323 are located at both ends of the first sidewall 322 along the second direction. The groove bottom wall 321 and the two second sidewalls 323 of the groove 32 form an opening 324 on the side facing away from or near the root of the tab 22 along the first direction. The opening 324 is a first through hole, and the first groove bottom surface of the groove 32 is inclined towards the opening 324. Alternatively, the groove bottom wall 321 and the two second sidewalls 323 of the groove 32 both form an opening 324 on the side facing away from and near the root of the tab 22 along the first direction, where one opening 324 is a first through hole and the other is not. The first groove bottom surface of the groove 32 is inclined towards the first through hole, or both openings 324 are first through holes, and the first groove bottom surface of the groove 32 is inclined towards the two first through holes through a double-slope structure.

[0036] In specific implementation, a third through hole penetrating the protrusion 31 is provided on the bottom surface of the first tank. This ensures that the electrolyte is quickly discharged from the groove 32 and flows into the receiving cavity to wet the body of the battery cell 2.

[0037] In specific implementation, the angle between the inclination direction of the bottom surface of the first tank and the virtual horizontal plane ranges from 2° to 20°, and the virtual horizontal plane is perpendicular to the third direction. The angle between the inclination direction of the bottom surface of the first tank and the virtual horizontal plane can be any one of 2°, 3°, 4°, 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, or 20°. This angle limitation not only prevents the angle from being too small, which would fail to achieve the purpose of completely draining the electrolyte, but also prevents the angle from being too large, which would result in the bottom of the groove 32 having an excessively large dimension along the third direction, thus affecting the capacity of the groove 32.

[0038] For specific implementation details, please refer to [link / reference]. Figure 2 and Figure 4 The insulating component 3 includes a first insulating part 33 and a second insulating part 34, wherein the first insulating part 33 is connected to the cover plate 1; the second insulating part 34 is located on the side of the first insulating part 33 facing the main body 21; one end of the second insulating part 34 along a second direction is rotatably connected to the first insulating part 33; the second direction is the length direction of the housing, and a schematic diagram of the second direction is shown in [reference needed]. Figure 2 .

[0039] The tab 22 includes a bent portion and a connecting portion. The connecting portion is located between the second insulating portion 34 and the first insulating portion 33, and the connecting portion and the root are connected by the bent portion. The second insulating portion 34 has a protrusion 31. When the electrolyte is not quickly absorbed by the body of the cell 2 after injection, a portion of the electrolyte remains between the separator and the cover plate 1 of the battery body. The first insulating portion 33 and the second insulating portion 34 are provided between the separator and the cover plate 1. A portion of the electrolyte will remain on the side of the second insulating portion 34 away from the body. In subsequent processes, the electrolyte will be slowly absorbed by the body, but a portion of the electrolyte will remain on the side of the second insulating portion 34 away from the body. If there is no violent shaking or vibration, this portion of electrolyte will remain. The through hole and / or opening 324 in the groove 32 on the protrusion 31 of the second insulating portion 34 allows the electrolyte to flow into the receiving cavity to prevent electrolyte retention.

[0040] In specific implementation, the cover plate 1 is provided with a terminal post 4; the connecting part of the electrode tab 22 is connected to the terminal post 4 through an adapter piece, and along a third direction, the end of the protrusion 31 away from the main body 21 abuts against the adapter piece or the first insulating part 33. The two abut against each other to support each other and prevent them from collapsing. In addition, since the amount of electrolyte injected is fixed according to the specifications of the battery cell, the amount of electrolyte in the cover plate 1 and insulating parts 3, etc., should be as small as possible, except for the electrolyte in the cell body 2. Therefore, the abutment between the two can increase the volume of the groove 32 and prevent the electrolyte from overflowing into the area outside the groove 32 of the second insulating part 34.

[0041] In specific implementation, such as Figure 6 As shown, the second insulating portion 34 includes a substrate 341 and a protrusion 31, with the protrusion 31 connected to the substrate 341. The substrate 341 has a first surface facing the cover plate 1 and a second surface facing away from the first surface along its thickness direction. A portion of the protrusion 31 protrudes from the first surface of the substrate 341, and another portion of the protrusion 31 protrudes from the second surface of the substrate 341. A second through-hole 35 is provided on the portion of the protrusion 31 protruding from the first surface of the substrate 341, connecting the groove 32 and the receiving cavity. This allows electrolyte that cannot flow out from positions other than the groove 32 on the second insulating portion 34 to flow into the groove 32 through the second through-hole 35, and then into the receiving cavity from the groove 32. This relatively lengthens the path of the electrolyte into the receiving cavity, thereby buffering the impact of the electrolyte on the cell 2 body, acting as a diversion mechanism, and accelerating the flow of the electrolyte.

[0042] In a specific implementation, along a third direction, a through fourth through hole 36 is provided on the substrate 341 of the second insulating part 34. Electrolyte is injected into the second insulating part 34 through the injection hole and then flows out through the fourth through hole 36 on the second insulating part 34. However, when the electrolyte cannot flow out through the fourth through hole 36 in time, the electrolyte will flow into the groove 32 of the protrusion 31 through the second through hole 35. The bottom surface of the first groove in the groove 32 is inclined and is provided with a first through hole and / or opening 324, so that the electrolyte can flow along the bottom surface of the first groove and flow out completely from the first through hole and / or opening 324, which can prevent the electrolyte from accumulating in the groove 32.

[0043] This application also provides a battery, including the aforementioned battery cell.

[0044] As can be seen, in the battery provided in this application embodiment, the protrusion 31 of the insulating component 3 of the battery cell is spaced apart from the root of the tab 22 along the first direction, and the protrusion 31 abuts against the end of the body 21 of the cell 2 facing the cover plate 1. Based on the bending of the tab 22, the protrusion 31 abuts between the cover plate 1 and the body 21, which can play the role of supporting the cover plate 1. This can prevent the side of the cover plate 1 not connected to the tab 22 from being suspended, thereby preventing the cover plate 1 from tilting and preventing the cover plate 1 from damaging the housing and the cell 2 during the process of pressing the cell 2 into the housing, ensuring the efficiency of housing insertion. At the same time, the groove 32 on the protrusion 31 is connected to the receiving cavity through the first through hole, which can promote the electrolyte to flow better into the receiving cavity, so that the electrolyte can fully wet the body of the cell 2 and prevent some electrolyte from remaining in the groove 32.

[0045] This application also provides an electrical device including the battery described above.

[0046] Since the electrical device uses the battery described in the above embodiments, please refer to the above embodiments for the beneficial effects of the electrical device.

[0047] There are no particular limitations on the electrical equipment used in this application, which may include, but are not limited to: laptops, pen input computers, mobile computers, e-book players, portable telephones, portable fax machines, portable copiers, portable printers, stereo headphones, video recorders, LCD TVs, portable cleaners, portable CD players, mini CDs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, electric bicycles, bicycles, lighting fixtures, toys, game consoles, clocks, power tools, flashlights, cameras, large household batteries, and lithium-ion capacitors, etc.

[0048] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cell, characterized in that, include: A housing having a receiving cavity, and the housing having an opening communicating with the receiving cavity on at least one side along a third direction; Cover plate (1) to close the opening; The battery cell (2) is placed in the receiving cavity. The battery cell (2) has a body (21) and a tab (22). The tab (22) has a root and the root is connected to one end of the body (21) facing the cover plate (1). An insulating member (3) is disposed on the side of the cover plate (1) facing the battery cell (2); the insulating member (3) has a protrusion (31); the protrusion (31) abuts against the end of the main body (21) facing the cover plate (1), and the protrusion (31) and the root of the electrode (22) are spaced apart along a first direction; along the third direction, a groove (32) is formed on the side of the protrusion (31) away from the main body (21); the first direction is the width direction of the housing; the third direction is the height direction of the housing. The groove (32) has an inclined first groove bottom surface, and the first groove bottom surface has a first end and a second end that are disposed opposite to each other along the inclined direction; along the third direction, the first end is closer to the main body (21) than the second end. The protrusion (31) is provided with a first through hole, which is located on the side of the first end away from the second end along the inclined direction of the bottom surface of the first groove; the first through hole connects the groove (32) and the receiving cavity; Along the third direction, at least a portion of the hole wall height of the first through hole is not higher than the height of the first end.

2. The battery cell according to claim 1, characterized in that, Along the first direction, an opening (324) is formed on the side of the protrusion (31) away from the root of the tab (22), and the opening (324) communicates with the groove (32).

3. The battery cell according to claim 2, characterized in that, The opening (324) is the first through hole; the groove (32) has a groove bottom wall (321), and along the third direction, the side surface of the groove bottom wall (321) facing away from the main body (21) is the first groove bottom surface.

4. The battery cell according to claim 1, characterized in that, The bottom surface of the first groove is provided with a third through hole that penetrates the protrusion (31).

5. The battery cell according to any one of claims 1 to 4, characterized in that, The angle range between the inclination direction of the bottom surface of the first groove and the dummy horizontal plane is 2°-20°, and the dummy horizontal plane is perpendicular to the third direction.

6. The battery cell according to claim 5, characterized in that, The insulating element (3) includes: The first insulating part (33) is connected to the cover plate (1); The second insulating part (34) is located on the side of the first insulating part (33) facing the main body (21); one end of the second insulating part (34) along the second direction is rotatably connected to the first insulating part (33); the second direction is the length direction of the housing; The tab (22) includes a bent portion and a connecting portion. The connecting portion is located between the second insulating portion (34) and the first insulating portion (33), and the connecting portion and the root portion are connected through the bent portion. The second insulating portion (34) has the protrusion (31).

7. The battery cell according to claim 6, characterized in that, The cover plate (1) is provided with a pole post; the connecting part of the pole lug (22) is connected to the pole post through an adapter piece, and along the third direction, the end of the protrusion (31) away from the main body (21) abuts against the adapter piece or the first insulating part (33).

8. The battery cell according to claim 6, characterized in that, The second insulating portion (34) includes a substrate (341) and the protrusion (31), the protrusion (31) being connected to the substrate (341); the substrate (341) has a first surface disposed toward the cover plate (1) and a second surface disposed away from the first surface along its thickness direction, a portion of the protrusion (31) protruding from the first surface of the substrate (341) and another portion of the protrusion (31) protruding from the second surface of the substrate (341); The portion of the protrusion (31) that protrudes from the first surface of the substrate (341) is provided with a second through hole (35), which connects the groove (32) and the receiving cavity.

9. A battery, characterized in that, Includes the battery cell as described in any one of claims 1 to 8.

10. An electrical appliance, characterized in that, Includes the battery as described in claim 9.

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