Top cover assembly, battery cell, battery cell assembly method and electrical equipment

Abstract

The present application discloses a top cover assembly, which is applied to a battery cell. The battery cell includes a shell and a battery cell accommodated in the shell, including: a top cover shell assembly, which can be accommodated in the inner cavity of the shell, and the top cover shell assembly includes: an insulating member, which is arranged on the side of the top cover shell assembly facing the battery cell; a transition member, which is arranged on the side of the insulating member facing the battery cell, and is used to connect the battery cell; a first end cover, which is arranged on the side of the insulating member away from the battery cell, and the projection contour of the first end cover on the insulating member falls within the area defined by the outer edge contour of the insulating member; a pole, which is connected to the transition member and passes through the insulating member and the first end cover in sequence. It can be seen that due to the design that the top cover shell assembly can be accommodated in the inner cavity of the shell of the battery cell, the present application can improve the battery cell assembly efficiency, improve the process operability and shorten the pole ear length. The present application also discloses a battery cell, a battery cell assembly method and an electrical device.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell assembly, and in particular to a top cover assembly, a battery cell, a battery cell assembly method, and an electrical device. Background Art

[0002] Battery cells are a common energy storage device in the current new energy technology field, such as dual-pass battery cells, single-pass battery cells, etc. Taking dual-pass battery cells as an example, as the name suggests, dual-pass battery cells have openings on both sides of the shell to facilitate the insertion of the battery cell. The assembly process of battery cells is usually as follows:

[0003] The battery cell is welded to the tab of the top cover assembly on one side.

[0004] The battery cell is put into the shell.

[0005] The battery cell is welded to the tab of the bottom cover assembly on the other side.

[0006] The top cover assembly and the bottom cover assembly are respectively welded to an opening of the shell.

[0007] That is, the assembly process of the battery cell is completed according to: "welding the pole ear on one side → inserting into the shell → welding the pole ear on the other side → welding the top cover assembly and the bottom cover assembly to both sides of the shell respectively".

[0008] It can be seen that in the related art, the assembly process of the battery cell is relatively complicated, which is specifically manifested in that the welding process of the tabs on both sides must be carried out separately, and respectively before and after the shelling process.

[0009] At the same time, the welding of the pole ear on one side needs to be carried out after the battery cell is put into the shell, which is bound to be interfered by the shell. The pole ear needs to be left longer so that a part of the pole ear can be pulled out of the shell. After being welded to the top cover assembly, it is bent and placed back into the shell. This will cause the pole ear to be left too long and increase the difficulty of the welding process. Summary of the invention

[0010] The embodiments of the present application disclose a top cover assembly, a battery cell, a battery cell assembly method and an electrical device, which can solve the problems in the related art that the welding process of the two side tabs must be carried out separately, resulting in a complicated battery cell assembly process, excessive tab length and low process operability.

[0011] In order to achieve the above-mentioned purpose, in a first aspect, the present application discloses a top cover assembly, which is applied to a battery cell. The battery cell includes a shell and a battery cell accommodated in the shell, including: a top cover shell assembly, which can be accommodated in the inner cavity of the shell, and the top cover shell assembly includes: an insulating member, which is arranged on the side of the top cover shell assembly facing the battery cell; a adapter, which is arranged on the side of the insulating member facing the battery cell and is used to connect the battery cell; a first end cover, which is arranged on the side of the insulating member away from the battery cell, and the projection outline of the first end cover on the insulating member falls within the area defined by the outer edge outline of the insulating member; a pole, which is connected to the adapter and passes through the insulating member and the first end cover in sequence.

[0012] Optionally, the top cover assembly further includes a second end cover, which is disposed on a side of the insulating member facing away from the battery cell and is provided with a receiving hole for accommodating the first end cover; the second end cover is used to seal the opening of the shell.

[0013] Optionally, a first overlapping portion is provided on the side of the outer periphery of the first end cover close to the insulating member; a second overlapping portion is provided on the side of the accommodating hole away from the insulating member; the first overlapping portion and the second overlapping portion are stacked in sequence in a direction away from the insulating member; the first end cover is limitedly matched with the second end cover in a direction perpendicular to the insulating member through the first overlapping portion, the second overlapping portion.

[0014] Optionally, the projection area of ​​the insulating member on the second end cover is smaller than the area of ​​the region defined by the outer contour of the surface of the second end cover facing the shell entry direction; the shell entry direction is the height direction of the shell; the inner wall surface of the accommodating hole fits with the outer peripheral surface of the first end cover, and the outer peripheral surface of the second end cover is used to fit with the inner peripheral surface of the shell to seal the opening, and to provide a gap between the insulating member and the shell in the first direction, and the first direction intersects with the shell entry direction.

[0015] Optionally, an explosion-proof valve is further included, at least one of the first end cover and the second end cover is provided with a through hole, the insulating member is provided with a pressure relief hole connected to the through hole, and the explosion-proof valve covers the through hole.

[0016] Optionally, a slot is provided on a side of the insulating member facing the battery core, and at least a portion of the adapter is engaged with the slot.

[0017] Optionally, a positioning protrusion is provided on the side of the insulating part facing the battery cell, the positioning protrusion is provided on the circumferential surface of the slot and protrudes toward the adapter, and a positioning recess is provided on the periphery of the adapter, the positioning recess is recessed in a direction away from the circumferential surface of the slot, the positioning protrusion is accommodated in the positioning recess, and the adapter is positioned and matched with the insulating part through the positioning recess and the positioning protrusion.

[0018] Optionally, a supporting protrusion is provided on a side of the insulating member facing the battery core, and the supporting protrusion is used to support the battery core.

[0019] In the second aspect, the present application discloses a battery cell, including a shell, a battery cell, a bottom cover assembly and a top cover assembly, the shell having an inner cavity, two opposite sides of the shell are provided with openings connected to the inner cavity, the top cover shell assembly is accommodated in the inner cavity of the shell, the adapter is connected to one side of the battery cell, the second end cover seals the opening on one side of the shell, the bottom cover assembly is connected to the other side of the battery cell and seals the opening on the other side of the shell.

[0020] In a third aspect, the present application discloses a method for assembling a battery cell, which is used to assemble a battery cell; the assembly method comprises:

[0021] The insulating member, the adapter, the first end cover and the pole are assembled to form a top cover into shell assembly.

[0022] The two opposite sides of the battery cell are respectively connected to the top cover shell assembly and the bottom cover assembly to form a shell assembly.

[0023] A side of the shell entry assembly having a top cover shell entry assembly is installed from the opening of the first side of the shell, so that the battery cell and the top cover shell entry assembly are both located in the shell, and the top cover shell entry assembly is located at the opening of the second side of the shell, and the bottom cover assembly is located at the opening of the first side of the shell; wherein the first side and the second side are arranged opposite to each other.

[0024] The second end cover is connected to the insulating member to form a top cover assembly with the top cover into the shell assembly, and the second end cover is used to seal the opening of the second side of the shell.

[0025] The bottom cover assembly is used to cover the opening of the first side of the housing.

[0026] In a fourth aspect, the present application discloses an electrical device including a battery cell.

[0027] Compared with the prior art, the beneficial effects of this application are:

[0028] The top cover assembly of the present application is applied to a battery cell, and the battery cell includes a shell and a battery cell contained in the shell, including: a top cover shell assembly that can be contained in the inner cavity of the shell, and the top cover shell assembly includes: an insulating member, which is arranged on the side of the top cover shell assembly facing the battery cell; a transition member, which is arranged on the side of the insulating member facing the battery cell and is used to connect the battery cell; a first end cover, which is arranged on the side of the insulating member away from the battery cell, and the projection contour of the first end cover on the insulating member falls within the area defined by the outer edge contour of the insulating member; a pole, which is connected to the transition member and passes through the insulating member and the first end cover in sequence. In this way, the present application can achieve the following technical effects:

[0029] On the first hand, the welding process of the tabs on both sides of the battery cell can be completed before the battery cell is put into the shell. The process is simplified from "welding the tab on one side → inserting into the shell → welding the tab on the other side" in the related technology to "welding the tabs on both sides → inserting into the shell" in the cost application, thereby improving the assembly efficiency of the battery cell.

[0030] On the second aspect, since the welding process of the tabs on both sides is carried out before the battery is placed in the shell, the welding process will not be interfered by the shell, thereby improving the operability of the assembly process of the battery cell.

[0031] On the third aspect, as mentioned above, the related art reserves a length for the pole ear so that it can be pulled out to the outside of the shell for welding, while the pole ear welding of the present application will not be interfered by the shell, so there is no need to lengthen the pole ear, thus shortening the length of the pole ear.

[0032] In summary, the top cover assembly of the present application can improve the efficiency of battery cell assembly, improve process operability, and shorten the length of the tab, thereby reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 An exploded view of a top cover assembly disclosed in the present application;

[0035] Figure 2 This is an overall structural diagram of a top cover assembly disclosed in this application;

[0036] Figure 3 This is a diagram of the internal structure of a battery cell disclosed in this application;

[0037] Figure 4 A method disclosed in this application Figure 3 A magnified view of point I;

[0038] Figure 5 A method disclosed in this application Figure 3 The enlarged view of II;

[0039] Figure 6 A method disclosed in this application Figure 3 AA section view;

[0040] Figure 7 This is a back structural diagram of an insulating member disclosed in this application;

[0041] Figure 8 A structural diagram of an adapter disclosed in this application;

[0042] Fig. 9 This is a disassembled diagram of a battery cell disclosed in this application;

[0043] Fig.10A first state diagram of a battery cell disclosed in the present application;

[0044] Fig.11 A second state diagram of a battery cell disclosed in the present application;

[0045] Fig.12 This is a third state diagram of a battery cell disclosed in this application.

[0046] Description of reference numerals:

[0047] 10- Shell assembly,

[0048] 100-top cover assembly,

[0049] 101-Top cover into shell assembly,

[0050] 110-Insulation parts,

[0051] 111-pressure relief hole, 112-slot, 113-positioning convex part, 114-supporting protrusion, 120-adapter,

[0052] 121-base, 122-ear connection part, 123-positioning recess, 124-via,

[0053] 130-first end cover,

[0054] 131-first overlapping portion, 132-through hole,

[0055] 150-pole,

[0056] 160-explosion-proof valve,

[0057] 140- second end cover,

[0058] 141 - accommodating hole, 142 - second overlapping portion,

[0059] 200-battery cells,

[0060] 210-core, 220-ear,

[0061] 300-shell,

[0062] 400-Bottom cover assembly. DETAILED DESCRIPTION

[0063] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0064] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0065] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0066] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0068] In the related art, the assembly process of the battery cell is relatively complicated and tedious. Taking a double-pass battery cell with openings on both sides of the shell as an example, the assembly process of the battery cell is generally as follows:

[0069] The battery cell is welded to the tab of the top cover assembly on one side.

[0070] The battery cell is put into the shell.

[0071] The battery cell is welded to the tab of the bottom cover assembly on the other side.

[0072] The top cover assembly and the bottom cover assembly are respectively welded to an opening of the shell.

[0073] That is, the assembly process of the battery cell is completed according to: "welding the pole ear on one side → inserting into the shell → welding the pole ear on the other side → welding the top cover assembly and the bottom cover assembly to both sides of the shell respectively".

[0074] It can be seen that the assembly of the battery cell must separate the welding process of the two side tabs, and they must be carried out before and after the shelling process. At the same time, the welding of one side of the tab needs to be carried out after the battery cell is shelled, which is bound to be interfered by the shell. The tab needs to be left longer so that part of the tab can be pulled out of the shell, and after being welded to the top cover assembly, it is bent and placed back into the shell. This causes the tab to be left too long and increases the difficulty of the welding process.

[0075] The purpose of this application is to solve the related problems. Figures 1 to 12 To elaborate.

[0076] Please refer to Figure 1 and Figure 2 The present application discloses a top cover assembly 100, which is applied to a battery cell. The battery cell includes a shell 300 and a battery cell 200 accommodated in the shell 300. Specifically, the top cover assembly 100 is used to cover the opening of the shell 300 of the battery cell and connect with the battery cell 200 for electrical conduction.

[0077] The top cover assembly 100 may include: a top cover shell entry assembly 101. The top cover shell entry assembly 101 can be accommodated in the inner cavity of the shell 300 of the battery cell, and the top cover shell entry assembly 101 includes: an insulating member 110, a switching member 120, a first end cap 130 and a pole 150. The cross-sectional area of ​​the top cover shell entry assembly 101 in the shell entry direction may be less than or equal to the cross-sectional area of ​​the inner cavity of the shell 300 in the shell entry direction. The shell entry direction is the height direction of the shell 300, which means that the top cover shell entry assembly 101 can freely pass in and out of the shell 300. This feature is crucial in the subsequent battery cell assembly process, and the specific assembly method will be described in detail later.

[0078] The insulating member 110 plays an insulating role to prevent the battery cell from leaking or other abnormalities. The insulating member 110 can be arranged on the side of the top cover assembly 100 facing the battery cell 200 of the battery cell. The adapter 120 is a conductive component of the top cover assembly 100 and can be arranged on the side of the insulating member 110 facing the battery cell 200 to connect the battery cell 200.

[0079] The first end cap 130 may be disposed on a side of the insulating member 110 away from the battery cell 200 , for example, bonded to the insulating member 110 , and a projection contour of the first end cap 130 on the insulating member 110 falls within a region defined by an outer edge contour of the insulating member 110 .

[0080] The pole 150 can be connected to the adapter 120, and the pole 150 passes through the insulating member 110 and the first end cover 130 in sequence, so that the battery cell 200, the adapter 120 and the pole 150 form a conductive loop to complete the power transmission.

[0081] Since the top cover housing assembly 101 can be freely inserted into and out of the housing 300, in the specific assembly process of the battery cell, the insulating member 110, the adapter 120, the first end cover 130 and the pole 150 can be assembled outside the housing 300. Figure 2 and Fig.10 The top cover into the shell assembly 101 shown; then the top cover into the shell assembly 101, the bottom cover assembly 400 described later and the pole ears 220 on both sides of the battery cell 200 are welded to form Fig.10 The shell-entry assembly 10 is shown; the shell-entry assembly 10 is then installed into the housing 300; thereby completing the battery cell assembly.

[0082] It can be seen that due to the split structure of the first end cover 130 and the second end cover 140 in the top cover assembly 100, and the top cover shell assembly 101 can freely penetrate the inner cavity of the shell 300 of the battery cell, the present application can achieve the following technical effects:

[0083] In the first aspect, the welding process of the tabs 220 on both sides of the battery cell 200 can be completed before the battery cell is put into the shell. The process is simplified from "welding the tabs on one side → inserting into the shell → welding the tabs on the other side" in the related technology to "welding the tabs 220 on both sides → inserting into the shell" in the cost application, thereby improving the assembly efficiency of the battery cell.

[0084] On the second aspect, since the welding process of the tabs 220 on both sides is performed before the battery is placed in the shell, the welding process will not be interfered by the shell 300, thereby improving the operability of the assembly process of the battery cell.

[0085] On the third aspect, as mentioned above, the related art reserves a length for the pole tab so that it can be pulled out to the outside of the shell for welding, while the pole tab welding of the present application will not be interfered by the shell 300, so there is no need to lengthen the pole tab, thus shortening the length of the pole tab.

[0086] In summary, the top cover assembly 100 of the present application can improve the battery cell assembly efficiency, improve process operability, and shorten the length of the tab, thereby reducing costs and increasing efficiency.

[0087] Optionally, since the top cover shell assembly 101 can freely penetrate into and out of the shell 300, after the battery is assembled, a gap will inevitably remain between the top cover shell assembly 101 and the shell 300, thereby affecting the sealing performance of the battery cell, etc. In order to solve this problem, the present application can adopt the following solutions:

[0088] The top cover assembly 100 may further include a second end cover 140, which is disposed on the side of the insulating member 110 facing away from the battery cell 200 and is provided with a receiving hole 141 for accommodating the first end cover 130. The second end cover 140 may be bonded to the insulating member 110 by adhesive or the like, or may be connected to the insulating member 110 by means of clamping, riveting, etc. The second end cover 140 is used to seal the opening of the housing 300 to achieve sealing of the opening of the housing 300, such as by mutual welding, bonding, etc.

[0089] In the assembly process, Fig.11 and Fig.12 As shown, after the shell assembly 10 is installed in the shell 300, the second end cover 140 is connected to the top cover shell assembly 101 to form the top cover assembly 100, and the second end cover 140 and the bottom cover assembly 400 are respectively used to cover the openings on both sides of the shell 300.

[0090] It can be seen that the split end cover structure of the top cover assembly 100 of the present application (i.e., the matching structure of the second end cover 140 and the first end cover 130) simplifies the assembly process of the battery to "welding the two side pole ears 220 outside the shell and then inserting the shell". By sealing the opening of the shell 300 through the second end cover 140, the sealing performance of the top cover assembly 100 to the battery cell can be improved.

[0091] Alternatively, if Figure 3 and Figure 4 As shown, a first overlapping portion 131 is provided on the outer periphery of the first end cover 130 on a side close to the insulating member 110; a second overlapping portion 142 is provided on the side of the accommodating hole 141 away from the insulating member 110; the first overlapping portion 131 and the second overlapping portion 142 are stacked in sequence in a direction away from the insulating member 110; the first end cover 130 is limitedly matched with the second end cover 140 in a direction perpendicular to the insulating member 110 through the first overlapping portion 131 and the second overlapping portion 142.

[0092] It can be seen that the interlocking design of the first end cover 130 and the second end cover 140 has the effect of pressing the first end cover 130 to prevent the first end cover 130 from detaching from the top cover assembly 100, thereby making the connection effect more stable; at the same time, the contact surface between the first end cover 130 and the second end cover 140 is increased, thereby making the welding or bonding effect therebetween more stable; furthermore, this interlocking design can improve the sealing effect and prevent dust and water stains from flowing along the gap between the first end cover 130 and the second end cover 140 to the insulating member 110.

[0093] Optionally, the second overlap portion 142 has a chamfered structure on one side facing the first overlap portion 131, the first overlap portion 131 has a chamfered structure on one side facing the second overlap portion 142, and the accommodating hole 141 has a chamfered structure on one side close to the insulating member 110. This can improve the installation efficiency between the first end cover 130 and the second end cover 140.

[0094] Alternatively, if Figure 3 to Figure 5 As shown, the projection area of ​​the insulating member 110 on the second end cover 140 is smaller than the area defined by the outer contour of the surface of the second end cover 140 in the shell entry direction; the shell entry direction is the height direction of the shell 300, and the shell entry direction is the direction in which the top cover shell entry assembly 101 is installed into the shell 300. In other words, in the shell entry direction, the contour of the second end cover 140 is larger than the contour of the insulating member 110, so that the whole formed by the second end cover 140 and the insulating member 110 forms a step structure in appearance, the second end cover 140 is the large end of the step structure, and the insulating member 110 is the small end of the step structure.

[0095] Among them, the inner wall surface of the receiving hole 141 and the outer peripheral surface of the first end cover 130 are mutually fitted, so that the relative position between the second end cover 140 and the first end cover 130 is fixed, and the relative position between the first end cover 130 and the insulating member 110 is also kept fixed, so the relative position between the second end cover 140 and the insulating member 110 can be fixed, that is, the second end cover 140 is positioned and matched with the insulating member 110 through the receiving hole 141 and the first end cover 130. At the same time, the outer peripheral surface of the second end cover 140 is used to fit with the inner peripheral surface of the housing 300 to seal the opening.

[0096] In this way, by fitting the second end cover 140 with the shell 300, and by fitting the second end cover 140 with the first end cover 130, the relative position relationship among the shell 300, the second end cover 140, and the insulating member 110 can be quickly determined to ensure that after the top cover shell assembly 101 is inserted into the shell, there is a gap between the insulating member 110 and the shell 300 in the first direction, and the first direction intersects with the shell entry direction. In this embodiment, the first direction is preferably perpendicular to the shell entry direction, for example, the first direction is the radial direction of the shell 300, so that mutual collision between the insulating member 110 and the shell 300 can be avoided, and the assembly efficiency of the battery cell can be improved.

[0097] Alternatively, if Figure 1 and Figure 2 As shown, the top cover assembly 100 may further include an explosion-proof valve 160. At least one of the first end cover 130 and the second end cover 140 is provided with a through hole 132, the insulating member 110 is provided with a pressure relief hole 111 communicating with the through hole 132, and the explosion-proof valve 160 covers the through hole 132.

[0098] In the present application, the through hole 132 is provided on the first end cover 130, so that the explosion-proof valve 160 is a component on the top cover into the shell assembly 101. It can be seen that the design of the explosion-proof valve 160 can improve the design flexibility of the present application and avoid opening an explosion-proof hole in the shell 300 to reduce the strength of the shell 300.

[0099] Of course, the through hole 132 can also be provided on the second end cover 140, so that the explosion-proof valve 160 needs to be assembled on the top cover shell assembly 101 together with the second end cover 140 after the top cover shell assembly 101 is inserted into the shell. The second end cover 140 and the first end cover 130 can also be provided with through holes 132 respectively, so that a plurality of explosion-proof valves 160 will be provided on the top cover assembly 100 to improve the exhaust pressure relief capability, which will not be described in detail here.

[0100] Alternatively, if Figure 3 and Figure 6 As shown, the battery cell 200 includes a core body 210 and a tab 220 connected to each other, and the tab 220 is arranged on a side of the core body 210 facing the adapter 120. For example, the tab 220 is a connecting piece with a rectangular cross section.

[0101] The adapter 120 includes a base 121 and a tab connection portion 122. The base 121 is disposed on the insulating member 110, and the tab connection portion 122 is disposed on a side of the base 121 facing the core 210. The tab connection portion 122 is used to extend toward the core 210 to connect the tab 220. For example, the tab connection portion 122 is a connecting plate with a rectangular cross section. The extension direction of the tab 220 and the extension direction of the tab connection portion 122 are both parallel to the shell entry direction.

[0102] It can be seen that in this design, the pole lug 220 does not need to be pulled out of the shell for welding, so there is no need to lengthen it by bending, winding, etc. The pole lug connecting portion 122 and the pole lug 220 can directly extend and fit together to achieve electrical connection between the two, which more effectively shortens the length of the pole lug 220.

[0103] Optionally, the fitting surfaces of the tab 220 and the tab connection portion 122 and the tab connection portion 122 and the tab 220 can be parallel to the shell entry direction, that is, the tab 220 and the tab connection portion 122 are fitted sideways, which can increase the contact area between them.

[0104] Optionally, two tab connections 122 can be provided, and the two tab connections 122 are arranged opposite to each other and distributed on two opposite sides of the base 121, so that two battery cells 200 can be provided in the battery cell and connected to the tab connections 122 to increase the capacity of the battery cell.

[0105] Alternatively, if Figure 6 to Figure 8As shown, a slot 112 may be provided on the side of the insulating member 110 facing the battery cell 200, and at least a portion of the adapter 120 is engaged with the slot 112. In this way, the adapter 120 can be limited to prevent the adapter 120 from shaking, rotating, or other abnormalities. At the same time, the insulating member 110 and the adapter 120 can also reuse the height, which is beneficial to the overall thinning of the top cover assembly 100.

[0106] Optionally, the adapter 120 is provided with a through hole 124, and at least a portion of the pole 150 is accommodated in the through hole 124 to connect the adapter 120. In this way, the adapter 120 can be positioned by the pole 150, thereby improving the positioning effect of the adapter 120. At the same time, the adapter 120 and the pole 150 can also reuse the height, which is beneficial to the overall thinning of the top cover assembly 100.

[0107] Optionally, the insulating member 110 is provided with a positioning protrusion 113 on the side facing the battery cell 200, the positioning protrusion 113 is provided on the groove circumference of the card slot 112, and protrudes toward the adapter 120, and the adapter 120 is provided with a positioning recess 123 on the periphery, the positioning recess 123 is recessed in a direction away from the groove circumference of the card slot 112, the positioning protrusion 113 is accommodated in the positioning recess 123, and the adapter 120 is positioned and matched with the insulating member 110 through the positioning recess 123 and the positioning protrusion 113. In this way, the positioning effect of the adapter 120 can be further improved.

[0108] Optionally, a support protrusion 114 is provided on the side of the insulating member 110 facing the battery cell 200 , and the support protrusion 114 is used to support the battery cell 200 to prevent the battery cell 200 from shaking during use and pulling the tab 220 , resulting in failure of the connection between the tab 220 and the adapter 120 .

[0109] The present application also discloses a battery cell, such as Figure 3 to Figure 6 as well as Fig.11 As shown, the battery cell may include a shell 300, a battery cell 200, a bottom cover assembly 400 and a top cover assembly 100. The shell 300 has an inner cavity, and openings communicating with the inner cavity are provided on opposite sides of the shell 300. The top cover shell assembly 101 is accommodated in the inner cavity of the shell 300. The adapter 120 is connected to one side of the battery cell 200. The second end cap 140 is connected to the top cover shell assembly 101 and seals the opening on one side of the shell 300. The bottom cover assembly 400 is connected to the other side of the battery cell 200 and seals the opening on the other side of the shell 300. As described above, the battery cell assembly of the present application has high efficiency, strong process operability, and can shorten the length of the pole ear, thereby reducing costs and increasing efficiency.

[0110] The present application also discloses a method for assembling a battery cell, which is used to assemble the above-mentioned battery cell. The assembly method includes:

[0111] The insulating member 110, the adapter 120, the first end cover 130, the pole 150 and the explosion-proof valve 160 are assembled to form a top cover into the shell assembly 101, as shown in FIG. Figure 2 and Fig. 9 shown.

[0112] The two opposite sides of the battery cell 200 are connected to the top cover housing assembly 101 and the bottom cover assembly 400 to form the housing assembly 10. Fig.10 shown.

[0113] The side of the shell-entry assembly 10 provided with the top cover shell-entry assembly 101 is installed from the opening of the first side of the shell 300, so that the battery cell 200 and the top cover shell-entry assembly 101 are both located in the shell 300, and the top cover shell-entry assembly 101 is located at the opening of the second side of the shell 300, and the bottom cover assembly 400 is located at the opening of the first side of the shell 300; wherein the first side and the second side are arranged opposite to each other, specifically as shown in FIG. Fig.10 and Fig.11 shown.

[0114] The second end cover 140 is connected to the insulating member 110 to form a top cover assembly 100 with the top cover housing assembly 101, and the second end cover 140 is used to cover the opening of the second side of the housing 300. Fig.11 and Fig.12 shown.

[0115] The bottom cover assembly 400 covers the opening of the first side of the housing 300. Fig.11 and Fig.12 shown.

[0116] As described above, the welding process of the tabs 220 on both sides of the battery cell 200 can be completed before the battery cell is put into the shell. The process is simplified from "welding the tab on one side → entering the shell → welding the tab on the other side → welding the top cover assembly and the bottom cover assembly on both sides of the shell" in the related technology to "welding the tabs 220 on both sides → entering the shell → welding the second end cover 140 and the bottom cover assembly 400 on both sides of the shell" in the cost application, which improves the assembly efficiency. At the same time, it can also improve the process operability, shorten the tab length, and play a role in reducing costs and increasing efficiency.

[0117] The present application also discloses an electric device, including the above-mentioned battery cell. The battery cell is used to supply power to the electric device, such as an energy storage device, an electric car, a laptop computer, etc., which will not be described in detail here.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A top cover assembly (100) applied to a battery cell, the battery cell comprising a housing (300) and a battery cell (200) accommodated in the housing (300), characterized in that: include: The top cover shell assembly (101) can be accommodated in the inner cavity of the shell (300), and the top cover shell assembly (101) comprises: An insulating member (110) is arranged on a side of the top cover housing assembly (101) facing the battery core (200); A transition piece (120), arranged on a side of the insulating piece (110) facing the battery core (200), and used for connecting the battery core (200); A first end cover (130) is arranged on a side of the insulating member (110) facing away from the battery core (200), and a projection contour of the first end cover (130) on the insulating member (110) falls within a region defined by an outer edge contour of the insulating member (110); A pole (150) connected to the adapter (120) and passing through the insulating member (110) and the first end cover (130) in sequence; The top cover assembly (100) further comprises a second end cover (140), the second end cover (140) being arranged on a side of the insulating member (110) facing away from the battery cell (200) and being provided with a receiving hole (141) for receiving the first end cover (130); the second end cover (140) is used to seal the opening of the shell (300).

2. The top cover assembly (100) according to claim 1, characterized in that: A first overlapping portion (131) is provided on a side of the outer periphery of the first end cover (130) close to the insulating member (110); a second overlapping portion (142) is provided on a side of the accommodating hole (141) away from the insulating member (110); The first overlapping portion (131) and the second overlapping portion (142) are sequentially overlapped in a direction away from the insulating member (110); The first end cover (130) is limitedly matched with the second end cover (140) in a direction perpendicular to the insulating member (110) through the first overlapping portion (131) and the second overlapping portion (142).

3. The top cover assembly (100) according to claim 1, characterized in that: The projection area of ​​the insulating member (110) on the second end cover (140) is smaller than the area of ​​a region defined by the outer contour of the surface of the second end cover (140) facing the shell entry direction; the shell entry direction is the height direction of the shell (300); The inner wall surface of the accommodating hole (141) and the outer peripheral surface of the first end cover (130) are in contact with each other. The outer circumferential surface of the second end cover (140) is used to fit together with the inner circumferential surface of the shell (300) to cover the opening and to allow a gap to exist between the insulating member (110) and the shell (300) in a first direction, wherein the first direction intersects with the shell entry direction.

4. The top cover assembly (100) according to claim 2, characterized in that: Also includes an explosion-proof valve (160), At least one of the first end cover (130) and the second end cover (140) is provided with a through hole (132), the insulating member (110) is provided with a pressure relief hole (111) connected to the through hole (132), and the explosion-proof valve (160) covers the through hole (132).

5. The top cover assembly (100) according to claim 3, characterized in that: A slot (112) is provided on a side of the insulating component (110) facing the battery core (200), and at least a portion of the adapter (120) is snap-connected to the slot (112).

6. The top cover assembly (100) according to claim 5, characterized in that: A positioning protrusion (113) is provided on a side of the insulating member (110) facing the battery core (200); the positioning protrusion (113) is provided on a groove circumference surface of the clamping groove (112) and protrudes toward the adapter (120). A positioning recess (123) is provided on the periphery of the adapter (120), and the positioning recess (123) is recessed in a direction away from the peripheral surface of the slot (112). The positioning protrusion (113) is accommodated in the positioning recess (123), and the adapter (120) is positioned and matched with the insulating component (110) through the positioning recess (123) and the positioning protrusion (113).

7. The top cover assembly (100) according to any one of claims 1 to 6, characterized in that: A supporting protrusion (114) is provided on a side of the insulating member (110) facing the battery core (200). The supporting protrusion (114) is used to support the battery core (200).

8. A battery cell, characterized in that: It comprises a housing (300), a battery cell (200), a bottom cover assembly (400), and a top cover assembly (100) according to any one of claims 1 to 7, The housing (300) has an inner cavity, and two opposite sides of the housing (300) are provided with openings communicating with the inner cavity. The top cover housing assembly (101) is accommodated in the inner cavity of the housing (300), the adapter (120) is connected to one side of the battery cell (200), and the second end cover (140) covers the opening on one side of the housing (300). The bottom cover assembly (400) is connected to the other side of the battery cell (200) and covers the opening on the other side of the housing (300).

9. A method for assembling a battery cell, characterized in that: Used to assemble and form the battery cell according to claim 8; The assembly method comprises: Assembling the insulating component (110), the adapter (120), the first end cover (130) and the pole (150) to form a top cover into shell assembly (101); Connecting two opposite sides of the battery cell (200) to the top cover housing assembly (101) and the bottom cover assembly (400) respectively to form a housing assembly (10); The side of the shell entry assembly (10) provided with the top cover shell entry assembly (101) is installed from the opening of the first side of the shell (300), so that the battery cell (200) and the top cover shell entry assembly (101) are both located in the shell (300), and the top cover shell entry assembly (101) is located at the opening of the second side of the shell (300), and the bottom cover assembly (400) is located at the opening of the first side of the shell (300); wherein the first side and the second side are arranged opposite to each other; The second end cover (140) is connected to the insulating member (110) to form the top cover assembly (100) together with the top cover housing assembly (101), and the second end cover (140) is used to cover the opening on the second side of the housing (300); The bottom cover assembly (400) covers the opening on the first side of the housing (300).

10. An electrical device, characterized in that: Comprising the battery cell according to claim 8.

Images