Battery cell, battery, top cover and electric device

Abstract

A battery cell (1000), a battery, a top cover (100), and an electric device. The battery cell (1000) comprises a housing (200), poles (300), and a top cover (100); the housing (200) is provided with an open end; the top cover (100) is provided with mounting holes (100a), and is connected to the open end of the housing (200); each pole (300) passes through the corresponding mounting hole (100a) and is connected to the top cover (100); the top cover (100) is provided with a first side wall (10) and a second side wall (20) distributed on two sides in a thickness direction, the first side wall (10) faces away from the housing (200), and the second side wall (20) faces the housing (200); clearance portions (10a) recessed towards the second side wall (20) are formed on the first side wall (10); and the upper ends of the poles (300) protrude from the first side wall (10). According to the provided battery cell (1000), battery, top cover (100) and electric device, the clearance portions (10a) are provided to accommodate at least part of a busbar (2000), thereby reducing the required height of the poles (300), and improving the space utilization rate of the battery cell (1000).

Description

Battery cell, battery, top cover and electric device

[0001] Cross-reference to Related Applications

[0002] The present disclosure is based on and claims priority to Chinese Patent Application No. 202420763326.9, filed on April 12, 2024, entitled “Battery cell, battery, top cover and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of batteries, and in particular to a battery cell, a battery, a top cover and an electric device. BACKGROUND

[0004] In related technologies, the battery cell pole is connected by a gasket. In order to prevent interference between the gasket and the top cover, there is usually a certain requirement for the height of the pole. However, as the energy density requirement of the battery cell becomes higher and higher, the gasket has become a bottleneck restricting the development of the energy density of the battery cell.

[0005] SUMMARY

[0006] Therefore, a first aspect of embodiments of the present disclosure provides a battery cell, which includes a shell, a pole and a top cover. The shell has an open end. The top cover has a mounting hole, and the top cover is connected to the open end of the shell. The pole is arranged in the mounting hole and connected to the top cover. The top cover has a first side wall and a second side wall distributed on both sides along the thickness direction. The first side wall faces away from the shell, and the second side wall faces the shell. The first side wall has a clearance recessed towards the second side wall. The upper end of the pole protrudes from the first side wall.

[0007] In this way, the clearance can accommodate at least part of the gasket, thereby reducing the required height of the pole and improving the space utilization of the battery cell.

[0008] In some embodiments, the depth of the clearance is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0009] By setting a suitable depth of the clearance, the clearance can fully play a role.

[0010] In some embodiments, the clearance is configured as a groove, and the bottom wall thickness of the groove is less than the thickness of the top cover.

[0011] In this way, the clearance does not occupy the accommodation space in the shell, and the energy density of the battery cell can be improved.

[0012] In some embodiments, the clearance is configured as a pit, and the pit protrudes from the second side wall.

[0013] In this way, the thickness of each part of the top cover is consistent, and the adverse effects on the strength of the top cover can be reduced.

[0014] In some embodiments, the material of the top cover is steel.

[0015] Since the steel has high strength, the thickness of the material can be reduced when the top cover is made of steel, and the avoidance portion can be formed by stamping.

[0016] In some embodiments, the battery cell further includes a lower plastic part disposed on the second side wall, and the lower plastic part is provided with a clearance space corresponding to the avoidance portion.

[0017] In this way, the structure of the lower plastic part is designed accordingly, and the clearance space can accommodate the avoidance portion.

[0018] A second aspect of the embodiments of the present disclosure aims to provide a battery including a gasket and a plurality of battery cells described above, the plurality of battery cells being arranged side by side; the gasket includes at least one lower recess and two extension portions, the lower recess being connected between the two extension portions, and the two extension portions being connected with the pole posts of the two battery cells, respectively; wherein the lower recess is curved towards the direction of the battery cell, and at least part of the lower recess is located in the avoidance portion.

[0019] In this way, by providing the lower recess on the gasket, the avoidance portion can accommodate at least part of the gasket, reduce the required height of the pole post, and improve the space utilization of the battery cell.

[0020] In some embodiments, the gasket further includes a connecting portion, and the lower recess is two or more, and the adjacent two lower recesses are connected by the connecting portion, and the number of avoidance portions is adapted to the number of lower recesses.

[0021] In this way, the two or more lower recesses can be arranged in the avoidance portions of the adjacent two battery cells arranged side by side.

[0022] In some embodiments, the sum of the thickness of the gasket, the height of the pole post protruding from the top cover, and the depth of the avoidance portion is greater than or equal to the total height of the gasket in the thickness direction of the top cover.

[0023] In this way, sufficient avoidance space can be provided, and the possibility of interference between the lower recess and the top cover can be reduced.

[0024] In some embodiments, the cross-sectional area of the avoidance portion is equal in the direction from the first side wall to the second side wall, and the minimum lateral distance between the side wall where the avoidance portion is located and the lower recess is greater than or equal to 0 and less than or equal to 0.5 mm.

[0025] In some embodiments, the cross-sectional area of the avoidance portion gradually decreases in the direction from the first side wall to the second side wall, and the minimum cross-sectional area of the avoidance portion is greater than the area of the outer bottom wall of the lower recess.

[0026] In this way, the avoidance portion can sufficiently accommodate the outer bottom wall of the lower recess, the top cover can provide sufficient avoidance space, and the possibility of interference between the lower recess and the top cover can be reduced.

[0027] A third aspect of the embodiments of the present disclosure is intended to provide a top cover, which is the top cover of any of the above-mentioned battery cells.

[0028] A fourth aspect of the embodiments of the present disclosure aims to provide an electrical device, the electrical device comprising any one of the batteries described above, the battery being used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic diagram of a structure of a battery cell connected to a battery cell according to one or more embodiments;

[0030] FIG2 is a top view of FIG1 ;

[0031] FIG3 is a schematic diagram of the AA cross-sectional structure of FIG2 ;

[0032] FIG4 is an enlarged structural diagram of point B in FIG3 .

[0033] Explanation of Reference Numerals: battery cell 1000 ; top cover 100 ; mounting hole 100 a ; first side wall 10 ; air-avoiding portion 10 a ; second side wall 20 ; housing 200 ; pole 300 ; tab 2000 ; recessed portion 2100 ; extension portion 2200 ; connecting portion 2300 . DETAILED DESCRIPTION

[0034] The following embodiments of the technical solution of the present disclosure are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present disclosure and are therefore only examples and are not intended to limit the scope of protection of the present disclosure.

[0035] In the description of the embodiments of the present disclosure, it should be noted that the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present disclosure 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. Therefore, they cannot be understood as limitations on the embodiments of the present disclosure.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure pertains. The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the present disclosure. The terms "including" and "having" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusions.

[0037] In the description of the embodiments of the disclosure, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the disclosure, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0038] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the disclosure. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiments, nor is it mutually exclusive or alternative to independent or alternative embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0039] In the description of the embodiments of the disclosure, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0040] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.

[0041] In the related art, the pole of the battery cell is connected through the tab, the tab is connected with the pole through welding, and the expansion force of the battery cell during use will have an adverse effect on the weld between the tab and the pole. Therefore, the tab is usually provided with a bending part to alleviate the adverse effect of the expansion force of the battery cell on the weld between the tab and the pole. The bending part of the tab can be provided as an upper convex part or a lower concave part. The lower concave part has certain requirements on the height of the pole, and the height of the pole occupies more space, reducing the space utilization efficiency of the battery cell and limiting the energy density of the battery cell.

[0042] Therefore, the embodiments of the disclosure provide a battery, as shown in FIG. 1, which comprises a tab 2000 and a plurality of battery cells 1000, and the plurality of battery cells 1000 are arranged side by side. The battery is composed of a plurality of battery cells 1000 in series and parallel combination, and the tab 2000 is used to realize the electrical connection between the plurality of battery cells 1000.

[0043] In the battery, the plurality of battery cells 1000 can be connected in series or in parallel or in a mixed connection, and the mixed connection means that the plurality of battery cells 1000 are connected in series and in parallel. The plurality of battery cells 1000 can be directly connected in series or in parallel or in a mixed connection, and the whole formed by the plurality of battery cells 1000 is placed in the box of the battery. Of course, the battery can also be in the form of a battery module in which the plurality of battery cells 1000 are connected in series or in parallel or in a mixed connection, and the plurality of battery modules are connected in series or in parallel or in a mixed connection to form a whole and are placed in the box of the battery.

[0044] The battery disclosed in the embodiments of the present disclosure can be used in a power consumption device using the battery as a power source or various energy storage systems using the battery as an energy storage element, such as an energy storage container.

[0045] The battery can be a secondary battery, which means that the battery can be used continuously by activating the active material through charging after discharging.

[0046] The battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0047] The battery cell can be cylindrical, prismatic or other shapes. The prismatic battery cell includes a square cell or a multi-prismatic cell, such as a hexagonal prismatic cell, etc., which is not particularly limited in the present disclosure.

[0048] The present disclosure takes a square cell as an example for illustration.

[0049] Please refer to FIGS. 1-4, the embodiments of the present disclosure further provide a battery cell 1000, which comprises a shell 200, a pole 300 and a top cover 100; the shell 200 has an open end; the top cover 100 has a mounting hole 100a, and the top cover 100 is connected to the open end of the shell 200; the pole 300 is arranged in the mounting hole 100a and connected to the top cover 100. The top cover 100 is connected to the shell 200 of the battery cell 1000, and the top cover 100 has a first side wall 10 and a second side wall 20 distributed on both sides along the thickness direction, the first side wall 10 faces away from the shell 200, and the second side wall 20 faces the shell 200, the first side wall 10 is formed with a clearance 10a recessed toward the second side wall 20, and the upper end of the pole 300 protrudes from the first side wall 10.

[0050] The pole 300 is electrically connected to the tab. The pole 300 can be directly connected to the tab, or indirectly connected to the tab through an adapter. The pole 300 includes a positive pole and a negative pole, and the poles 300 between two battery cells 1000 are connected by a tab.

[0051] Exemplarily, referring to FIGS. 1-3, two battery cells 1000 are arranged side by side, the positive pole of one battery cell 1000 is arranged adjacent to the negative pole of the other battery cell 1000, and the two ends of the tab 2000 are connected to the positive pole of one battery cell 1000 and the negative pole of the other battery cell 1000, respectively. The poles 300 of the two battery cells 1000 are protruded from the top cover 100 and connected to the tab 2000. The end of the tab 2000 is located on the top of the pole 300.

[0052] Referring to FIG. 4, the thickness of the top cover 100 is D1. The thickness of the top cover 100 refers to the initial thickness before the avoidance portion 10a is arranged, which is the distance between the first sidewall 10 and the second sidewall 20. The material of the top cover 100 can be a metal material, such as aluminum alloy, steel, or iron, etc.

[0053] The avoidance portion 10a is lower than the first sidewall 10, and the shape of the avoidance portion 10a is not limited as long as it can provide an accommodation space for accommodating part of the tab 2000.

[0054] In this way, the avoidance portion 10a can accommodate at least part of the tab 2000, thereby reducing the required height of the pole 300 and improving the space utilization of the battery cell 1000.

[0055] Exemplarily, the tab 2000 has a lower recess 2100, and the lower recess 2100 is elastically deformed to alleviate the adverse effect of the expansion force of the battery cell 1000 on the weld between the tab 2000 and the pole 300. The single lower recess 2100 of the tab 2000 can be formed in a "U" shape, a "V" shape, two lower recesses 2100 can be formed in a "W" shape, etc.

[0056] In some embodiments, referring to FIG. 4, the tab 2000 includes at least one lower recess 2100 and two extension portions 2200, the lower recess 2100 is connected between the two extension portions 2200, and the two extension portions 2200 are connected to the poles 300 of the two battery cells 1000, respectively. The lower recess 2100 of the tab 2000 is curved towards the direction of the battery cell 1000, and at least part of the lower recess 2100 is located in the avoidance portion 10a.

[0057] In this embodiment, by arranging the lower recess 2100 on the tab 2000, the avoidance portion 10a can accommodate at least part of the tab 2000, thereby reducing the required height of the pole 300 and improving the space utilization of the battery cell 1000.

[0058] In some embodiments, referring to FIG. 4, the depth of the avoidance portion 10a is D2. The depth of the avoidance portion 10a is greater than or equal to 0.5 mm and less than or equal to 5 mm. mm is millimeter.

[0059] Exemplarily, the depth of the avoidance portion 10a is D2, and the value of D2 can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm, etc. In this embodiment, the depth of the avoidance portion 10a is set to be appropriate, so that the avoidance portion 10a can fully play a role. By setting the depth of the avoidance portion 10a to be greater than or equal to 0.5 mm, the adverse effect on the elasticity of the tab 2000 is reduced, and the part of the tab 2000 located in the avoidance portion 10a can better play a buffering role; by setting the depth of the avoidance portion 10a to be less than or equal to 5 mm, the influence on the strength of the top cover 100 is reduced.

[0060] It can be understood that the depth of the avoidance portion 10a refers to the depth of the first side wall 10 from the second side wall 20 in the thickness direction of the top cover 100.

[0061] In some embodiments, the avoidance portion 10a is configured as a groove, and the bottom wall thickness of the groove is less than the thickness of the top cover 100.

[0062] It should be noted that the groove in the embodiment of the present disclosure refers to thinning the local thickness of the top cover 100, which can be understood as digging a groove in the first side wall 10 of the top cover 100 in the thickness direction, and at least part of the tab 2000 is arranged in the groove. For example, the material of the top cover can be aluminum alloy, and the thickness of the top cover is relatively thick, and a thinning processing method can be used to form the groove-shaped avoidance portion 10a.

[0063] In this embodiment, the avoidance portion 10a is set as a groove, which is convenient for production and processing, does not occupy the accommodation space in the shell 200, and can improve the energy density of the battery cell 1000. The cross-sectional shape of the groove can be rectangular.

[0064] In some embodiments, the avoidance portion 10a is configured as a pit, and the pit protrudes from the second side wall 20.

[0065] It should be noted that the pit in the embodiment of the present disclosure refers to locally pressing the top cover 100, which can be understood as pressing the first side wall 10 of the top cover 100 in the thickness direction, for example, the pit is formed by stamping, forming a pit that is recessed in the thickness direction of the top cover 100 towards the second side wall 20, and at least part of the tab 2000 is arranged in the pit.

[0066] In this embodiment, the avoidance portion 10a is provided, and the thickness of each part of the top cover 100 can be consistent, which can reduce the adverse effect on the strength of the top cover 100. The part of the pit protruding from the second side wall 20 is located in the space where the tab is located, and does not occupy the space of the battery cell, so as not to affect the improvement of the energy density of the battery cell.

[0067] In some embodiments, the top cover 100 is made of steel. Since steel has high strength, the thickness of the top cover 100 can be reduced when the top cover 100 is made of steel, and the concave-shaped avoiding portion 10a can be formed by stamping.

[0068] In some embodiments, the battery cell 1000 further includes a lower plastic part disposed on the second side wall 20 of the top cover 100, and the lower plastic part is provided with a avoiding space corresponding to the avoiding portion 10a. In this way, the structure of the lower plastic part is designed accordingly, and the avoiding space can accommodate the avoiding portion 10a.

[0069] In some embodiments, referring to FIG. 4, the tab 2000 further includes a connecting portion 2300, and the lower recessed portion 2100 is two or more, and adjacent two lower recessed portions 2100 are connected by the connecting portion 2300. The number of the avoiding portion 10a is adapted to the number of the lower recessed portion 2100.

[0070] In this embodiment, when the number of the lower recessed portion 2100 is N (N is a natural number greater than 1), N-1 connecting portions 2300 are provided correspondingly, and each adjacent two lower recessed portions 2100 are connected by one connecting portion 2300. When the number of the lower recessed portion 2100 is two, one connecting portion 2300 is located between the two lower recessed portions 2100. The two lower recessed portions 2100 can be respectively arranged in the avoiding portions 10a of the two battery cells 1000 arranged side by side. That is, one lower recessed portion 2100 is located in the avoiding portion 10a of one top cover 100, and the other lower recessed portion 2100 is located in the avoiding portion 10a of the other top cover 100. In this way, the lower recessed portion 2100 is connected by the connecting portion 2300, which can improve the strength of the tab 2000 and further improve the strength of the battery. Moreover, the two lower recessed portions 2100 of one tab 2000 are respectively located in the avoiding portions 10a of the two battery cells 1000, which can reduce the structural space of the top cover 100 occupied by the avoiding portion 10a of a single tab 2000, and can reduce the influence on the strength of the top cover 100 of a single battery cell 1000.

[0071] The number of the avoiding portion 10a is adapted to the number of the lower recessed portion 2100, which means that the number of the avoiding portion 10a is greater than or equal to the number of the lower recessed portion 2100, and the position of the avoiding portion 10a can correspond to the lower recessed portion 2100.

[0072] In some embodiments, the sum of the thickness of the tab 2000, the height of the pole 300 protruding from the top cover 100, and the depth of the avoiding portion 10a is greater than the total height of the tab 2000 along the thickness direction of the top cover 100.

[0073] 4 , the thickness of the tab 2000 is D3, the height of the pole 300 protruding from the top cover 100 is D4, and the total height of the tab 2000 along the thickness direction of the top cover 100 is D5. The outer bottom wall of the lower recess 2100 does not abut against the clearance portion 10a.

[0074] In this embodiment, by controlling the thickness of the tab 2000, the thickness of the pole 300 protruding from the top cover 100, and the depth D2 of the air avoidance portion 10a, the top cover 100 provides sufficient air avoidance space, reducing the possibility of interference between the lower recess 2100 and the top cover 100.

[0075] In some embodiments, the sum of the thickness of the tab 2000 , the height of the pole 300 protruding from the top cover 100 , and the depth of the airtight portion 10 a is equal to the total height of the tab 2000 along the thickness direction of the top cover 100 .

[0076] In this embodiment, the outer bottom wall of the lower concave portion 2100 abuts against the air-avoiding portion 10 a , the tab 2000 and the top cover 100 need to be insulated, and the air-avoiding portion 10 a can support the lower concave portion 2100 .

[0077] In some embodiments, the cross-sectional area of ​​the clearance portion 10a is uniform from the first sidewall 10 toward the second sidewall 20, for example, having a rectangular cross-section. The minimum lateral spacing between the sidewall where the clearance portion 10a is located and the lower recess 2100 is greater than or equal to 0 and less than or equal to 0.5 mm. For example, referring to FIG. 4 , the minimum lateral spacing between the sidewall where the clearance portion 10a is located and the lower recess 2100 is D6, and the value of D6 can be 0, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm, among others.

[0078] In this embodiment, the minimum transverse distance between the side wall where the avoidance portion 10a is located and the lower recess 2100 is set to be greater than 0 and less than or equal to 0.5 mm, so that the lower recess 2100 can be smoothly placed in the avoidance portion 10a.

[0079] For example, when the minimum lateral distance between the side wall where the air avoidance portion 10a is located and the lower recess 2100 is 0, that is, the side wall where the air avoidance portion 10a is located is in contact with the lower recess 2100, the tab 2000 and the top cover 100 need to be insulated.

[0080] In some embodiments, the cross-sectional area of ​​the clearance portion 10a gradually decreases from the first sidewall 10 toward the second sidewall 20, and the minimum cross-sectional area of ​​the clearance portion 10a is greater than the area of ​​the outer bottom wall of the lower recess 2100. It is understood that the minimum cross-sectional area of ​​the clearance portion 10a is located at the bottom of the clearance portion 10a. The cross-sectional area of ​​the lower recess 2100 also gradually decreases from the first sidewall 10 toward the second sidewall 20, and the minimum cross-sectional area of ​​the lower recess 2100 is located at the outer bottom wall of the lower recess 2100.

[0081] In this embodiment, the avoidance portion 10a can fully accommodate the outer bottom wall of the lower recess 2100, and the top cover 100 can provide sufficient avoidance space, thereby reducing the possibility of interference between the lower recess 2100 and the top cover 100.

[0082] In some embodiments, the battery cell 1000 includes a shell 200, a pole 300, and a top cover 100; the shell 200 has an open end; the top cover 100 has a mounting hole 100a, and the top cover 100 is connected to the open end of the shell 200; the pole 300 is arranged in the mounting hole 100a and connected to the top cover 100, and the upper end of the pole 300 protrudes from the first side wall 10. The top cover 100 is connected to the shell 200 of the battery cell 1000, and the top cover 100 has a first side wall 10 and a second side wall 20 distributed on both sides along the thickness direction, the first side wall 10 faces away from the shell 200, the second side wall 20 faces the shell 200, and the first side wall 10 is formed with an avoidance portion 10a. The tab 2000 includes two lower recesses 2100, a connecting portion 2300, and two extension portions 2200, the two lower recesses 2100 are connected between the two extension portions 2200, the connecting portion 2300 is located between the two lower recesses 2100, and the two extension portions 2200 are respectively connected to the poles 300 of the two battery cells 1000. The lower recess 2100 of the tab 2000 is curved towards the direction of the battery cell 1000, and at least part of the lower recess 2100 is located in the avoidance portion 10a. The depth of the avoidance portion 10a is 3 mm. The avoidance portion 10a is configured as a groove, and the bottom wall thickness of the groove is less than the thickness of the top cover 100. The cross-sectional area of the avoidance portion 10a is equal from the first side wall 10 to the second side wall 20, the lateral distance between the side wall where the avoidance portion 10a is located and the lower recess 2100 is greater than 0. The sum of the thickness of the tab 2000, the height of the pole 300 protruding from the top cover 100, and the depth of the avoidance portion 10a is greater than the total height of the tab 2000 along the thickness direction of the top cover 100. In this way, the avoidance portion 10a can fully accommodate the outer bottom wall of the lower recess 2100, and the top cover 100 can provide sufficient avoidance space, thereby reducing the possibility of interference between the lower recess 2100 and the top cover 100.

[0083] The disclosure also provides a top cover, which is the top cover of any of the above battery cells.

[0084] The disclosure also provides a use electric device, which includes the above battery.

[0085] The use electric device includes but is not limited to mobile phones, tablets, notebook computers, electric toys, electric tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, the electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0086] The various embodiments / implementations provided by the present disclosure can be combined with each other without producing contradictions.

[0087] The above merely provides the preferred embodiments of the present disclosure, but not for limiting the present disclosure. For the person skilled in the art, the present disclosure can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A battery cell comprising: a housing having an open end; a top cover, the top cover having a mounting hole and connected to the open end of the shell; a pole, the pole being passed through the mounting hole and connected to the top cover; In which, the top cover has a first side wall and a second side wall distributed on both sides along the thickness direction, the first side wall is back to the shell, the second side wall faces the shell, and a gap is formed on the first side wall which is recessed toward the second side wall, and the upper end of the pole protrudes from the first side wall.

2. The battery cell according to claim 1, wherein: The depth of the air-avoiding portion is greater than or equal to 0.5 mm and less than or equal to 5 mm.

3. The battery cell according to claim 1 or 2, wherein: The avoidance portion is configured as a groove, and a bottom wall thickness of the groove is smaller than a thickness of the top cover.

4. The battery cell according to claim 1 or 2, wherein: The avoidance portion is configured as a recessed pit, and the recessed pit protrudes from the second side wall.

5. The battery cell according to claim 4, wherein: The material of the top cover is steel.

6. The battery cell according to claim 4 or 5, wherein: The battery core further includes a lower plastic component, which is arranged on the second side wall. The lower plastic component is provided with an escape space corresponding to the escape portion.

7. A battery comprising: A plurality of battery cells according to any one of claims 1 to 6, wherein the plurality of battery cells are arranged side by side; A tab, the tab comprising at least one recessed portion and two extended portions, the recessed portion being connected between the two extended portions, and the two extended portions being respectively connected to the poles of the two battery cells; The concave portion is bent toward the battery core, and at least a portion of the concave portion is located in the air-avoiding portion.

8. The battery according to claim 7, wherein The bar also includes a connecting portion, there are two or more recessed portions, two adjacent recessed portions are connected by the connecting portion, and the number of the air-avoiding portions is adapted to the number of the recessed portions.

9. The battery according to claim 7 or 8, wherein The sum of the thickness of the tab, the height of the pole protruding from the top cover, and the depth of the air-avoiding portion is greater than or equal to the total height of the tab along the thickness direction of the top cover.

10. The battery according to any one of claims 7 to 9, wherein The cross-sectional area of ​​the gap is equal from the first side wall to the second side wall, and the minimum transverse distance between the side wall where the gap is located and the recessed portion is greater than or equal to 0 and less than or equal to 0.5 mm; or The cross-sectional area of ​​the gap portion gradually decreases from the first side wall toward the second side wall, and the minimum cross-sectional area of ​​the gap portion is greater than the area of ​​the outer bottom wall of the recessed portion.

11. A top cover, being the top cover in the battery cell according to any one of claims 1 to 5.

12. An electrical device comprising the battery according to any one of claims 7 to 10, for providing electrical energy.

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