Top cover assembly, battery cell and battery pack

Abstract

A top cover assembly, a battery cell, a battery and an electrical apparatus. The top cover assembly comprises a cover plate, a terminal and rivets, the cover plate being provided with through holes, and the terminal being provided with terminal via holes; the terminal is arranged on the cover plate, the through holes and the terminal via holes are connected to form riveting holes, and the rivets pass through the riveting holes to rivet the cover plate and the terminal together; each rivet comprises a riveting end penetrating into a terminal via hole, and in the penetrating direction of the riveting end, the terminal via hole successively comprises a neck portion and an accommodating section having an inner diameter greater than that of the neck portion; the riveting ends passing through the neck portions and accommodated in the accommodating sections are used for forming deformation portions each having an inner diameter greater than that of the neck portions under the action of an external force, and the deformation portions can be directly or indirectly in interference fit with the accommodating sections. The top cover assembly can improve the strength of terminals and rivets which are riveted and fixed.

Description

Top cover assembly, battery cells and battery packs Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a top cover assembly, a battery cell and a battery pack. Background Art

[0002] The overall airtightness of a battery cell is primarily determined by the seals at the positive and negative poles and the explosion-proof valve. The pole seal is primarily achieved by the assembly of multiple parts. The rivet pins are fixed to the poles, and the sealing is achieved by compressing the internal sealing ring, causing it to deform. Therefore, the coordination between the poles and the rivet pins is of paramount importance, and their coordination should remain fixed and free of gaps despite external forces and environmental influences. However, in related technologies, the poles and rivet pins riveted together are not very strong, and can become loose when affected by external impacts and ambient temperature, leading to the formation of gaps.

[0003] Application Contents

[0004] Based on this, it is necessary to provide a top cover assembly that can improve the strength of the poles and the rivet pins that are riveted together to address the above problems.

[0005] A top cover assembly, comprising:

[0006] a cover plate, wherein the cover plate has a through hole;

[0007] A pole, wherein the pole is provided with a pole through-hole;

[0008] The pole is placed on the cover plate, and the through hole is connected with the pole through hole to form a riveting hole;

[0009] a rivet passing through the rivet hole to rivet the cover plate and the pole together, the rivet comprising a riveting end penetrating into the pole through hole;

[0010] Along the penetration direction of the riveting end, the pole through hole sequentially includes a neck and a receiving section with an inner diameter larger than that of the neck;

[0011] The riveting end passing through the neck and placed in the accommodating section is used to form a deformed portion larger than the inner diameter of the neck under the action of external force, and the deformed portion can directly or indirectly be interference-fitted with the accommodating section.

[0012] In one embodiment, the pole through hole is a speaker hole.

[0013] In one embodiment, in the direction from the cover plate to the pole, the inner wall of the pole through hole is inclined outward by 5°-20°.

[0014] In one embodiment, before the riveting end is deformed, the riveting end protrudes beyond the side of the pole away from the cover plate, and the deformed portion is flush with the side of the pole away from the cover plate.

[0015] In one embodiment, before the riveting end is deformed, the riveting end protrudes 3 mm to 8 mm from a side of the pole away from the cover plate.

[0016] In one embodiment, before the riveting end is deformed, the riveting end is a straight cylindrical structure.

[0017] The present application also provides a battery cell, comprising:

[0018] a housing having an opening;

[0019] a battery cell assembly, disposed in the housing; and

[0020] In the above-mentioned top cover assembly, the cover plate is arranged at the opening of the shell and is connected to the shell.

[0021] In one embodiment, a side of the pole away from the cover plate is fixed to the deformed portion by laser welding.

[0022] In one embodiment, the top cover assembly further includes a first insulating member, and the pole is insulated and disposed on a side of the cover plate away from the battery cell assembly by the first insulating member disposed between the cover plate and the pole.

[0023] In one embodiment, the top cover assembly further includes a sealing member and a second insulating member, the sealing member including a vertical sealing portion and a horizontal sealing portion, the vertical sealing portion is located in the through hole, the rivet pin is passed through the vertical sealing portion, the horizontal sealing portion is connected to the vertical sealing portion and is located between the rivet pin and the cover plate, and the second insulating member is located between the horizontal sealing portion and the rivet pin.

[0024] The present application also provides a battery pack, comprising:

[0025] The battery cells mentioned above are multiple in number and are arranged opposite to each other in sequence; and

[0026] A plurality of tabs, each of which electrically connects the poles of two adjacent battery cells.

[0027] In one embodiment, the pole has a riveted area and a connecting area on a side away from the cover plate, the pole via is located in the riveted area, and each of the tabs is electrically connected to the connecting areas of the poles of two adjacent battery cells.

[0028] In one embodiment, the bar has a connection portion electrically connected to the connection area;

[0029] The connecting area has a positioning groove, and the connecting portion is positioned in the positioning groove.

[0030] In one embodiment, the connecting portion is fixed to the inner wall of the positioning groove by laser welding.

[0031] In one embodiment, the bar has a connection portion electrically connected to the connection area;

[0032] The connecting portion is provided with a positioning hole, the connecting area is provided with a positioning column, and the positioning column is inserted into the positioning hole.

[0033] In one embodiment, the positioning post is fixed to the inner wall of the positioning hole by laser welding.

[0034] In one embodiment, the bar has a connecting portion electrically connected to the connecting area, the connecting area has a positioning groove, the connecting portion is positioned in the positioning groove, the connecting portion has a positioning hole, the connecting area has a positioning column, and the positioning column is inserted into the positioning hole.

[0035] In one embodiment, the connecting portion is fixed to the inner wall of the positioning groove by laser welding, and the positioning column is fixed to the inner wall of the positioning hole by laser welding.

[0036] In one embodiment, there are multiple riveted areas and multiple connecting areas, and the multiple riveted areas and the multiple connecting areas are staggered in the length direction of the cover plate;

[0037] The number of the pole through holes is the same as the number of the riveting areas and is arranged one to one. The number of the rivet pins is the same as the number of the pole through holes and is arranged one to one.

[0038] In one embodiment, the bar includes a main body and a connecting portion, and the opposite sides of the main body each have a plurality of spaced-apart connecting portions, and the number of the connecting portions on each side of the main body is the same as the number of the connecting areas of the pole and are connected one-to-one.

[0039] In the above-mentioned top cover assembly, the riveted end that passes through the neck and is placed in the accommodating section can form a deformed portion that is larger than the inner diameter of the neck under the action of external force, and the deformed portion can directly or indirectly interfere with the accommodating section, thereby completing the riveting. And since the pole through-hole includes a neck and an accommodating section with an inner diameter larger than the neck in sequence along the penetration direction of the riveted end, the neck can physically limit the deformed portion. Since the neck can physically limit the deformed portion, when the rivet is subjected to an external force (an external force opposite to the penetration direction of the riveted end), the rivet can always be fixedly connected to the pole. Therefore, in the above-mentioned top cover assembly, the cover plate, pole and riveted nails fixed together by riveting are of high strength, which can ensure that the cover plate, pole and riveted nails fixed together by riveting will not loosen when affected by external impact and ambient temperature, and can still be fixed together without gaps. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0041] FIG1 is a schematic structural diagram of a battery in one embodiment of the present application;

[0042] FIG2 is a partial enlarged view of point A in FIG1 ;

[0043] FIG3 is a schematic structural diagram of the top cover assembly in FIG1 ;

[0044] FIG4 is a top view of the top cover assembly shown in FIG3 ;

[0045] FIG5 is a cross-sectional view along the line BB in FIG4 ;

[0046] FIG6 is a partial enlarged view of point C in FIG5 . DETAILED DESCRIPTION

[0047] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0048] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0050] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0051] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0053] As shown in Figures 1 and 2, the battery pack 10 in the preferred embodiment of the present application includes a battery cell 12. In this embodiment, the battery cell 12 comprises a housing 12a, a cell assembly, and a top cover assembly 12b. The cell assembly can be housed within the housing 12a. The housing 12a has an opening. The top cover assembly 12b is disposed within the opening of the housing 12a.

[0054] In this embodiment, the top cover assembly 12b includes a cover plate 200, a terminal post 300, and a rivet 400. After the cover plate 200, the terminal post 300, and the rivet 400 are riveted together, they are assembled into the opening of the housing 12a, and the cover plate 200 is connected to the housing 12a to form a complete housing for the battery cell 12.

[0055] In this embodiment, as shown in Figures 2 to 6, the cover plate 200 has a through hole 210. The pole 300 has a pole through hole 310. The pole 300 is placed on the cover plate 200, and the through hole 210 and the pole through hole 310 are connected to form a riveted hole. Specifically, in this embodiment, the pole 300 is insulated and arranged on the side of the cover plate 200 away from the battery cell assembly. More specifically, in this embodiment, the pole 300 is insulated and arranged on the side of the cover plate 200 away from the battery cell assembly by a first insulating member 500 arranged between the cover plate 200 and the pole 300.

[0056] The rivet 400 passes through the rivet hole to rivet the cover plate 200 and the pole 300 together. The rivet 400 includes a rivet end 400a that penetrates the pole through-hole 310. Along the direction of penetration of the rivet end 400a, the pole through-hole 310 comprises a neck 310a and a receiving section 310b having an inner diameter larger than that of the neck 310a. The rivet end 400a, passing through the neck 310a and positioned within the receiving section 310b, is configured to form a deformable portion larger than the inner diameter of the neck 310a under the action of an external force. The deformable portion can directly or indirectly form an interference fit with the receiving section 310b.

[0057] In the top cover assembly 12b, the rivet end 400a that passes through the neck 310a and is placed in the receiving section 310b can form a deformed portion larger than the inner diameter of the neck 310a under the action of an external force, and the deformed portion can directly or indirectly interfere with the receiving section 310b, thereby completing the riveting. Since the pole through hole 310 includes a neck 310a and a receiving section 310b with an inner diameter larger than the neck 310a along the penetration direction of the rivet end 400a, the neck 310a can physically limit the deformed portion. Since the neck 310a can physically limit the deformed portion, when the rivet 400 is subjected to an external force (an external force opposite to the penetration direction of the rivet end 400a), the rivet 400 can always be fixedly connected to the pole 300. Therefore, in the above-mentioned top cover assembly 12, the cover plate 200, the pole 300 and the rivet nail 400 riveted together have high strength, which can ensure that the cover plate 200, the pole 300 and the rivet nail 400 riveted together will not loosen when affected by external impact and ambient temperature, and can still be fixed together without any gaps.

[0058] In this embodiment, the battery cell 12 is rectangular, and accordingly, the cover plate 200 is also rectangular. It is understood that in other embodiments, when the battery cell is cylindrical, the cover plate 200 may be circular.

[0059] In this embodiment, the rivet pin 400 is insulated and matched with the cover plate 200 through the sealing member 600 and the second insulating member 700. The rivet pin 400 is electrically connected and matched with the pole 300 by being riveted together with the pole 300. Specifically, in this embodiment, the sealing member 600 includes a vertical sealing portion and a horizontal sealing portion. The vertical sealing portion is located in the through hole 210, and the rivet pin 400 is passed through the vertical sealing portion, that is, the rivet pin 400 is passed through the through hole 210 at intervals. The horizontal sealing portion is connected to the vertical sealing portion and is located between the rivet pin 400 and the cover plate 200. The second insulating member 700 is located between the horizontal sealing portion and the rivet pin 400.

[0060] In this embodiment, the deformable portion can directly interfere with the accommodating section 310b. In this way, the parts of the top cover assembly 12b can be simplified, which is very convenient for manufacturing the top cover assembly 12b. It is understandable that in other embodiments, the deformable portion can indirectly interfere with the accommodating section 310b. In this case, before the riveting end 400a is deformed, an auxiliary part can be provided between the accommodating section 310b and the riveting end 400a. After the riveting end 400a is deformed, the deformable portion interferes with the accommodating section 310b through the auxiliary part located between the deformable portion and the accommodating section 310b, that is, the deformable portion indirectly interferes with the accommodating section 310b.

[0061] In this embodiment, the pole via 310 is a trumpet-shaped hole. That is, in this embodiment, the inner wall of the pole via 310 is inclined outward in the direction from the cover plate 200 to the pole 300. This not only improves the strength of the riveted connection between the cover plate 200, the pole 300, and the rivet 400, but also facilitates the formation of the pole via 310 with a neck portion 310a and a receiving section 310b. It is understood that in other embodiments, the pole via 310 may also be a stepped hole.

[0062] In this embodiment, before the rivet end 400a is deformed, it protrudes beyond the side of the pole 300 away from the cover plate 200. The deformed portion is flush with the side of the pole 300 away from the cover plate 200. This makes it very easy to make the deformed portion flush with the side of the pole 300 away from the cover plate 200. It will be understood that in other embodiments, before the rivet end 400a is deformed, the rivet end 400a may be accommodated in the accommodation section 310b, and the deformed portion may not be flush with the side of the pole 300 away from the cover plate 200.

[0063] In this embodiment, before the rivet pressing end 400a is deformed, the rivet pressing end 400a is a straight cylindrical structure. This makes it very easy to manufacture the rivet pressing nail 400. It is understood that in other embodiments, the rivet pressing end 400a of the rivet pressing nail 400 may also be a truncated cone structure.

[0064] In this embodiment, the inner wall of the pole through-hole 310 is tilted outward by 5°-20° in the direction from the cover plate 200 to the pole 300. If the tilt angle is too large, more material is required to ensure an interference fit between the rivet end 400a and the pole through-hole 310, while if the tilt angle is too small, the connection strength between the rivet pin 400 and the pole 300 after riveting will be affected. Taking the above factors into consideration, the inner wall of the pole through-hole 310 is tilted outward by 5°-20°. Specifically, in this embodiment, the inner wall of the pole through-hole 310 is tilted outward by 10° in the direction from the cover plate 200 to the pole 300.

[0065] In this embodiment, before the rivet end 400a is deformed, the rivet end 400a protrudes 3mm-8mm from the side of the pole 300 away from the cover plate 200. It can be understood that if the height of the protrusion is too large, it will be difficult to rivet the entire protruding portion into the pole through-hole 310, while if the height of the protrusion is too small, it may affect the interference fit between the rivet end 400a and the pole through-hole 310 and / or affect the connection strength between the rivet pin 400 and the pole 300. Taking the above factors into consideration, the rivet end 400a is set to protrude 3mm-8mm from the side of the pole 300 away from the cover plate 200. Specifically, in this embodiment, the rivet end 400a protrudes 5mm from the side of the pole 300 away from the cover plate 200.

[0066] In this embodiment, the side of the pole 300 facing away from the cover plate 200 is laser welded to the deformed portion of the rivet end 400a. Specifically, in this embodiment, the deformed portion of the rivet end 400a is interference-fitted with the pole via 310 at point a, and the side of the pole 300 facing away from the cover plate 200 is laser welded to the deformed portion of the rivet end 400a at point b. In this embodiment, dual fixation is achieved through riveting and laser welding. This further increases the connection strength between the rivet pin 400 and the pole 300, thereby ensuring that the riveted pole 300 and rivet pin 400 do not loosen due to external impacts and ambient temperature, remaining securely connected without gaps. Furthermore, compared to using only riveting or only laser welding, dual fixation through riveting and laser welding reduces the requirements for either riveting or laser welding, thereby facilitating both. It is understood that in other embodiments, laser welding can be omitted.

[0067] In this embodiment, as shown in Figures 1 and 2, a battery pack 10 includes a plurality of battery cells 12, which are arranged in a sequentially opposite arrangement. In the embodiment shown in Figure 1, there are two battery cells 12. It will be appreciated that in other embodiments, the number of battery cells 12 can be increased based on actual needs. For example, multiple rows of battery cells 12 can be provided, with each row of battery cells 12 including a plurality of battery cells 12 arranged in a sequentially opposite arrangement.

[0068] In this embodiment, the battery pack 10 further includes a plurality of tabs 14. Each tab 14 electrically connects the terminals 300 of two adjacent battery cells. This facilitates connecting multiple battery cells 12 in series and / or in parallel.

[0069] In this embodiment, as shown in Figures 2 and 3, the side of the pole 300 away from the cover plate 200 has a riveted area 300a and a connection area 300b. The pole via 310 is located in the riveted area 300a. Each bar 14 electrically connects the connection area 300b of the pole 300 of two adjacent battery cells. In this way, the rivet pins 400 and the bar 14 can be made independent of each other, avoiding interference between the rivet pins 400 and the bar 14. It will be understood that in other embodiments, each bar 14 electrically connects the riveted area 300a of the pole 300 of two adjacent battery cells.

[0070] In this embodiment, there are multiple riveted areas 300a and multiple connection areas 300b. The multiple riveted areas 300a and the multiple connection areas 300b are staggered in the length direction of the cover plate 200. The number of pole vias 310 is the same as the number of riveted areas 300a and is arranged one to one. The number of rivet pins 400 is the same as the number of pole vias 310 and is arranged one to one. In this way, the battery cell 12 can meet different application requirements. It is understandable that in other embodiments, multiple riveted areas 300a and multiple connection areas 300b can also be arranged randomly. It is understandable that in other embodiments, there can be only one riveted area 300a and one connection area 300b.

[0071] In the related art, no positioning structure is provided between the battery cell 12 and the tab 14 . When assembling the battery cell 12 and the tab 14 , a special positioning fixture is required, which complicates the assembly process of the battery cell 12 and the tab 14 .

[0072] To address the above issues, in this embodiment, the connection area 300b has a positioning groove 302. The tab 14 has a connecting portion 142 electrically connected to the connection area 300b. The connecting portion 142 mates with the positioning groove 302 and is positioned within it. The matching connection portion 142 and positioning groove 302 greatly facilitate the positioning and assembly of the battery cell 12 and tab 14, eliminating the need for a dedicated positioning fixture.

[0073] In this embodiment, the connection area 300b has a positioning post 304. The connection portion 142 has a positioning hole 142a. The positioning post 304 is inserted into the positioning hole 142a. The interlocking positioning post 304 and positioning hole 142a greatly facilitate the positioning and assembly of the battery cell 12 and the tab 14, thereby eliminating the need for a dedicated positioning fixture.

[0074] In this embodiment, the adaptable connecting portion 142 and the positioning groove 302 and the plug-in positioning post 304 and the positioning hole 142a are provided simultaneously, thereby achieving dual positioning and improving the positioning effect. It is understood that in other embodiments, only the adaptable connecting portion 142 and the positioning groove 302 or the plug-in positioning post 304 and the positioning hole 142a may be provided.

[0075] In this embodiment, the tab 14 also has a main body 144. The two opposite sides of the main body 144 have a plurality of spaced connection portions 142. The number of connection portions 142 on each side of the main body 144 is the same as the number of connection areas 300b of the pole 300 and is connected one-to-one. Specifically, in this embodiment, there are three rivet areas 300a, two connection areas 300b, and four connection portions 142. The two opposite sides of the main body 144 have two spaced connection portions 142. In this way, the structural design of the battery cell 12 and the tab 14 can be simplified. It is understood that in other embodiments, the number of connection areas 300b and the number of connection portions 142 is not limited to two, and can be set according to actual needs. It is understood that in other embodiments, the number of connection areas 300b and the number of connection portions 142 may also be different.

[0076] In this embodiment, the connection portion 142 is laser welded to the inner wall of the positioning groove 302. Specifically, in this embodiment, the connection portion 142 is laser welded to the inner wall of the positioning groove 302 at point c. This ensures a strong connection between the tab 14 and the battery cell terminal 300. It is understood that in other embodiments, the connection portion 142 and the inner wall of the positioning groove 302 may be fixed not only by laser welding but also by conductive adhesive.

[0077] In this embodiment, the positioning post 304 is laser welded to the inner wall of the positioning hole 142a. Specifically, in this embodiment, the positioning post 304 is laser welded to the inner wall of the positioning hole 142a at point d. This further ensures a strong connection between the tab 14 and the battery cell terminal 300. It is understood that in other embodiments, the positioning post 304 and the inner wall of the positioning hole 142a may be fixed not only by laser welding but also by conductive adhesive.

[0078] In this embodiment, the connecting portion 142 is laser welded to the inner wall of the positioning groove 302, and the positioning post 304 is laser welded to the inner wall of the positioning hole 142a, thereby achieving dual laser welding and better welding and fixing effects. It is understood that in other embodiments, only the connecting portion 142 and the inner wall of the positioning groove 302 or the positioning post 304 and the inner wall of the positioning hole 142a may be laser welded.

[0079] The present application also provides an electrical device, which includes the battery pack 10 or the battery cell 12 and can be powered by the battery pack 10 or the battery cell 12. The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, an energy storage device, an amusement ride, an elevator, a lifting device, and the like. A vehicle can be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle; a new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle; a spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft; an electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, or an electric airplane toy; an electric tool can include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer; an energy storage device can be an energy storage wall, a base station energy storage device, a container energy storage device, and the like; an amusement ride can be a carousel, a bungee jumping device, and the like. This application does not impose any special restrictions on the above-mentioned electrical devices.

[0080] For pure electric vehicles, the battery pack 10 can be used as a driving power source, thereby replacing fossil fuels to provide driving power.

[0081] The battery pack 10 may specifically include a battery management system (BMS) and a plurality of battery cells 12. The plurality of battery cells 12 may be electrically connected in series, in parallel, or in a combination of these, and may be communicatively connected to the battery management system to form a battery pack. The battery management system controls and monitors the operating status of each battery cell 12. Furthermore, the plurality of battery cells 12 may be first connected in series and / or in parallel and combined with the module management system to form a battery module. The plurality of battery modules may then be electrically connected in series, in parallel, or in a combination of these, and together with the battery management system to form a battery pack.

[0082] The multiple battery cells 12 in the battery pack 10 can be mounted on a supporting structure such as a box, frame, or bracket. Electrical connections can be established between the battery cells 12 and between the battery cells 12 and the battery management system via a busbar assembly. The battery cells 12 can be lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, and can have an external profile that is cylindrical, flat, rectangular, or other, but not limited to, a cylindrical shape.

[0083] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A top cover assembly, comprising: A cover plate, wherein the cover plate has a through hole; A pole, wherein the pole is provided with a pole through hole; The pole is placed on the cover plate, and the through hole is connected with the pole through hole to form a riveting hole; A rivet, passing through the rivet hole to rivet the cover plate and the pole together, the rivet comprising a riveting end penetrating into the pole through hole; Features: Along the insertion direction of the riveting end, the pole through hole sequentially includes a neck and a receiving section with an inner diameter larger than the neck; The riveting end passing through the neck and placed in the accommodating section is used to form a deformed portion larger than the inner diameter of the neck under the action of external force, and the deformed portion can directly or indirectly be interference-fitted with the accommodating section.

2. The top cover assembly according to claim 1, characterized in that The pole through hole is a speaker hole.

3. The top cover assembly according to claim 2, characterized in that: In the direction from the cover plate to the pole, the inner wall surface of the pole through hole is inclined outwardly by 5°-20°.

4. The top cover assembly according to claim 1, characterized in that: Before the riveting end is deformed, the riveting end protrudes beyond the side of the pole away from the cover plate, and the deformed portion is flush with the side of the pole away from the cover plate.

5. The top cover assembly according to claim 4, characterized in that: Before the riveting end is deformed, the riveting end protrudes 3mm-8mm from a side of the pole away from the cover plate.

6. The top cover assembly according to claim 1, characterized in that: Before the riveting end is deformed, the riveting end is a straight cylindrical structure.

7. A battery cell, characterized in that: include: a housing having an opening; A battery core assembly is disposed in the housing; as well as According to the top cover assembly as described in any one of claims 1 to 6, the cover plate is arranged at the opening of the shell and connected to the shell.

8. The battery cell according to claim 7, characterized in that: The side of the pole away from the cover plate is fixed to the deformed portion by laser welding.

9. The battery cell according to claim 7, characterized in that: The top cover assembly further includes a first insulating member, and the pole is insulated by the first insulating member disposed between the cover plate and the pole and disposed on a side of the cover plate away from the battery cell assembly.

10. The battery cell according to claim 7, characterized in that: The top cover assembly also includes a sealing member and a second insulating member, the sealing member includes a vertical sealing portion and a horizontal sealing portion, the vertical sealing portion is located in the through hole, the rivet pin is passed through the vertical sealing portion, the horizontal sealing portion is connected to the vertical sealing portion and is located between the rivet pin and the cover plate, and the second insulating member is located between the horizontal sealing portion and the rivet pin.

11. A battery pack, characterized in that: include: The battery cell according to any one of claims 7 to 10, wherein the number of the battery cells is multiple, and the multiple battery cells are arranged opposite to each other in sequence; as well as A plurality of tabs, each of which is electrically connected to the poles of two adjacent battery cells.

12. The battery pack according to claim 11, characterized in that: The pole has a riveting area and a connecting area on one side away from the cover plate, the pole via hole is located in the riveting area, and each of the tabs is electrically connected to the connecting areas of the poles of two adjacent battery cells.

13. The battery pack according to claim 12, characterized in that: The bar sheet has a connection portion electrically connected to the connection area; The connecting area has a positioning groove, and the connecting part is positioned in the positioning groove.

14. The battery pack according to claim 13, wherein: The connecting portion is fixed to the inner wall of the positioning groove by laser welding.

15. The battery pack according to claim 12, wherein: The bar sheet has a connection portion electrically connected to the connection area; The connecting portion is provided with a positioning hole, the connecting area is provided with a positioning column, and the positioning column is inserted into the positioning hole.

16. The battery pack according to claim 15, characterized in that: The positioning column is fixed to the inner wall of the positioning hole by laser welding.

17. The battery pack according to claim 12, wherein: The bar has a connecting portion electrically connected to the connecting area, the connecting area has a positioning groove, the connecting portion is positioned in the positioning groove, the connecting portion has a positioning hole, the connecting area has a positioning column, and the positioning column is inserted into the positioning hole.

18. The battery pack according to claim 17, wherein: The connecting portion is fixed to the inner wall of the positioning groove by laser welding, and the positioning column is fixed to the inner wall of the positioning hole by laser welding.

19. The battery pack according to claim 12, wherein: There are multiple riveting areas and multiple connecting areas, and the multiple riveting areas and the multiple connecting areas are arranged alternately in the length direction of the cover plate; The number of the pole through holes is the same as the number of the riveting areas and is arranged one to one, and the number of the rivet pins is the same as the number of the pole through holes and is arranged one to one.

20. The battery pack according to claim 19, wherein: The bar includes a main body and a connecting part. The two opposite sides of the main body have a plurality of spaced-apart connecting parts. The number of the connecting parts on each side of the main body is the same as the number of the connecting areas of the pole and are connected one-to-one.

Images