Battery cell cover plate assembly, battery cell and battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery cell cover plate assembly, a battery cell and a battery pack, the battery cell cover plate assembly comprises a cover plate and two first through holes respectively arranged at two ends along the length direction of the cover plate; the pole columns are mounted in the first through holes in a one-to-one correspondence manner; the pole comprises a pole body, and a first flange and a second flange which are arranged at two ends of the pole body; a second through hole is formed in the axial direction of the pole; the connecting piece is provided with a protruding part, the protruding part is installed in the second through hole and abuts against the first flange, the second flange and the pole body, and the connecting piece is installed and welded in the second through hole through the protruding part to be fixedly connected with the pole. According to the utility model, the second through hole is formed in the post body of the post, so that the overall weight of the post can be reduced, the overall weight of the battery cell is reduced, and the lightweight design of the battery cell is facilitated; and a lug boss matched with the second through hole is arranged on the connecting piece, so that the connecting piece is electrically connected with the pole.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cell cover plate assembly, a cell and a battery pack. Background Art

[0002] With the increasing maturity of new energy battery technology, new energy batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the use performance of new energy batteries are increasing day by day.

[0003] In the related art, a new energy battery is composed of a plurality of cells, and a cell generally includes a cover plate assembly, a pole group, a housing, etc. At present, most of the pole columns in the cover plate assembly are solid cylinders, resulting in a relatively heavy overall weight of the cell after the pole column is installed in the cover plate and assembled with the housing, which is not conducive to the lightweight design of new energy batteries. Summary of the Utility Model

[0004] In view of this, the utility model provides a cell cover plate assembly, a cell and a battery pack to solve the problem of the relatively heavy overall weight of the cell.

[0005] In a first aspect, the utility model provides a cell cover plate assembly, comprising:

[0006] A cover plate, on which two first through holes are provided, respectively arranged at both ends along the length direction of the cover plate;

[0007] A pair of pole columns, respectively installed in the first through holes; the pole column includes a column body and first flanges and second flanges provided at both ends of the column body, and a second through hole is axially provided in the pole column;

[0008] A connecting piece, on which a protruding portion is provided, the protruding portion is installed in the second through hole and abuts against the first flange, the second flange and the column body respectively, and the connecting piece is installed and welded in the second through hole to realize fixed connection with the pole column through the protruding portion.

[0009] Beneficial effects: By reasonably setting the position of the first through-hole, during the process of assembling each component on the cover plate, it enables the operator to more clearly distinguish the uses of through-holes at different positions, improving the assembly efficiency. It also enables the operator to quickly locate and handle problems related to specific through-holes during maintenance. Additionally, while ensuring the functions of other components on the cover plate, it maximally maintains the structural strength of the cover plate. A pole column is correspondingly installed in the first through-hole, such that the first flange and the second flange at both ends of the column body of the pole column are respectively located on the upper and lower sides of the first through-hole. Through the abutting cooperation of the first flange and the second flange with other components on the battery cell cover plate assembly, the pole column can be fixedly connected to other components on the battery cell cover plate assembly without adding additional connecting parts, thereby improving the space utilization rate inside the battery cell. A second through-hole is provided along the axial direction of the pole column. By opening the second through-hole on the column body of the pole column, the overall weight of the pole column can be reduced, thereby reducing the overall weight of the battery cell and facilitating the lightweight design of the battery cell. A raised portion matching the second through-hole is provided on the connecting piece. After the raised portion is inserted into the second through-hole, it is fixedly connected to the pole column by welding the raised portion inside the second through-hole, thereby realizing the electrical connection between the pole column and the connecting piece, facilitating the extraction of the electric quantity inside the battery cell to the outside, and effectively improving the connection efficiency between the pole column and the connecting piece.

[0010] In an alternative embodiment, it further includes an upper plastic ring sleeved on the pole column; the upper plastic ring includes a plastic ring body, a first ring provided on the outer periphery of the plastic ring body, and a second ring provided on the inner periphery of the plastic ring body; the second ring extends into the first through-hole; the second ring abuts against the column body and the cover plate respectively; the first flange abuts against the plastic ring body and is arranged inside the first ring.

[0011] Beneficial effects: Through the mutual abutting cooperation between the first flange and the second flange provided at both ends of the column body on the pole column and the first ring provided on the outer periphery of the plastic ring body and the second ring provided on the inner periphery of the plastic ring body on the upper plastic ring, the upper plastic ring can be fixed between the pole column and the cover plate without adding additional connecting parts, thereby improving the space utilization rate inside the battery cell. During the operation of the battery cell, it may be subject to vibration or impact. The upper plastic ring can also play a buffering role, reducing the direct collision and wear between the pole column and the cover plate, and reducing the risk of connection loosening or damage caused by vibration. At the same time, the upper plastic ring has good insulation performance, which can prevent accidental conductive contact between the pole column and the cover plate, thereby further improving the electrical safety of the battery cell.

[0012] In an alternative embodiment, it further includes a sealing ring sleeved on the pole column;

[0013] The sealing ring includes a sealing ring body and a third flange at the top of the sealing ring body. The third flange abuts against the second ring body, and the sealing ring body abuts against the cover plate, the second flange, and the column respectively.

[0014] Beneficial effects: The sealing ring is sleeved on the pole column. Through the cooperation of the third flange at the top of the sealing ring body and the second ring body, the tiny gap between the pole column and the cover plate can be filled, effectively preventing external dust, moisture, and other impurities from entering the battery cell, avoiding short circuits or corrosion inside the battery cell, and ensuring the normal operation and service life of the battery cell. The sealing ring body abuts against the cover plate, the second flange, and the column respectively, which can further play a buffering role during the operation of the battery cell, reduce the direct collision and wear between the pole column and the cover plate, and reduce the risk of connection loosening or damage caused by vibration.

[0015] In an optional embodiment, it further includes a connecting piece. The connecting piece includes a first connecting portion, a second connecting portion, and a transition connecting portion connecting between the first connecting portion and the second connecting portion. The transition connecting portion makes the first connecting portion and the second connecting portion in different planes;

[0016] The convex portion is arranged on the first connecting portion, and the convex portion is provided with a hollow cavity.

[0017] Beneficial effects: Since in the internal structure of the battery cell, the surface of the tab near one end of the electrode group is slightly convex. By making the two first connecting portions and the second connecting portion in different planes through the transition connecting portion, and the second connecting portion is slightly higher than the first connecting portion, it can better fix the first connecting portion and the second connecting portion of the connecting piece to the pole column and the tab respectively, avoiding interference between the connecting piece and other components inside the battery cell, thereby improving the compactness and rationality of the internal structure of the battery cell. By providing a hollow cavity on the convex portion, the usable space inside the battery cell can be further increased, and the space utilization rate inside the battery cell can be improved.

[0018] In an optional embodiment, it further includes a lower plastic sheet arranged between the cover plate and the connecting piece; the lower plastic sheet is provided with a fourth through hole corresponding to the first through hole; the pole column is installed in the fourth through hole.

[0019] Beneficial effects: By providing a fourth through hole corresponding to the first through hole on the lower plastic sheet, it is convenient for the pole column to pass through the first through hole and the fourth through hole and then be fixedly connected to the connecting piece; moreover, the lower plastic sheet has good insulation performance. Arranging the lower plastic sheet between the cover plate and the connecting piece can prevent accidental conductive contact between the pole column and the cover plate, further improving the electrical safety of the battery cell.

[0020] In an alternative embodiment, a plurality of third through-holes are further formed in the cover plate at intervals along the length direction, and the third through-holes are arranged between two of the first through-holes;

[0021] A plurality of sealing plates are respectively and correspondingly mounted on the plurality of third through-holes;

[0022] A liquid injection hole is further provided on the cover plate, and the liquid injection hole is arranged between two of the third through-holes.

[0023] Beneficial effects: By forming a plurality of third through-holes at intervals along the length direction of the cover plate, it is convenient to fixedly connect the tab to the connecting piece subsequently; correspondingly mounting the sealing plate on the third through-hole helps to improve the overall sealing performance of the battery cell, effectively preventing electrolyte leakage, reducing the risk of short circuit of the battery cell, and thus ensuring the safety performance and service life of the battery cell. By providing a liquid injection hole on the cover plate at the top of the battery cell, the electrolyte can flow into the battery cell more smoothly, thereby improving the liquid injection efficiency.

[0024] In a second aspect, the present invention further provides a battery cell, including:

[0025] The battery cell cover plate assembly as described above;

[0026] A housing having a receiving cavity and an opening communicating with the receiving cavity, and the battery cell cover plate assembly seals the opening; an explosion-proof valve is provided at the bottom of the housing;

[0027] A pole group is arranged in the receiving cavity, and tabs are provided on the pole group, and the tabs are electrically connected to the connecting piece of the battery cell cover plate assembly.

[0028] Beneficial effects: The housing of the battery cell and the battery cell cover plate assembly form a closed space, which can effectively protect the pole group and other internal components from external physical damage, such as collision, extrusion, etc.; moreover, it can also block dust, moisture and other impurities from entering the receiving cavity, avoiding affecting the normal operation of the battery cell and reducing the occurrence probability of faults such as short circuit and corrosion. Arranging the explosion-proof valve at the bottom of the housing can prevent the electrolyte from spraying out when the explosion-proof valve is opened, reducing the impact on the surrounding environment and equipment. Arranging the pole group in the receiving cavity and then sealing it with the cover plate assembly, this assembly method is simple and efficient, and when it is necessary to maintain or replace the internal components, the cover plate can be relatively conveniently opened for operation. By electrically connecting the tabs to the connecting piece of the battery cell cover plate assembly, the intermediate links and resistance of current transmission are reduced, enabling the current to flow more quickly and efficiently between the pole group and the external circuit, improving the charge and discharge performance of the battery cell.

[0029] In an alternative embodiment, the tab is integrally formed with the electrode group and extends away from the electrode group from the top end surface of the electrode group. The tab is provided with a bent portion, and the lower surface of the bent portion is fixedly connected to the upper surface of the connecting piece.

[0030] Advantages: Integrally forming the tab with the electrode group can increase the connection stability between the tab and the electrode group, and also avoid the possible poor connection between the tab and the electrode group, ensuring the stability and reliability of current transmission; the oppositely arranged tabs make the layout more compact, further saving the accommodation space inside the battery cell; by bending the tab to form a bent portion and fixedly connecting the lower surface of the bent portion to the connecting piece, the contact area of the second connecting portion between the tab and the connecting piece is increased, thereby enhancing the connection stability and current transmission ability.

[0031] In an alternative embodiment, the upper surface of the bent portion is a first welding area, and the first welding area is provided with a plurality of embossments.

[0032] Advantages: Setting the first welding area on the upper surface of the bent portion facilitates the welding operation, improves the accuracy and efficiency of welding. By providing a plurality of embossments in the first welding area, when using laser welding, the laser is vertically irradiated onto the first welding area, and the embossments reflect the laser to avoid the laser light source, reducing the ability of the reflected laser, thereby improving the efficiency of welding the tab and the connecting piece and improving the production efficiency.

[0033] In a third aspect, the present invention further provides a battery pack, including: a plurality of battery cells as described above.

[0034] Advantages: Since the battery pack includes battery cells, it has the same effects as the battery cells and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0036] Figure 1 It is a perspective view of a battery cell according to an embodiment of the present invention;

[0037] Figure 2 is Figure 1 a top view of the shown battery cell;

[0038] Figure 3 is Figure 2Cross-sectional view along the A-A direction;

[0039] Figure 4 is Figure 3 Partial enlarged schematic view of A in;

[0040] Figure 5 Stereogram of an electric core according to another embodiment of the present utility model;

[0041] Figure 6 is Figure 5 Top view of the electric core shown;

[0042] Figure 7 is Figure 6 Cross-sectional view along the B-B direction in;

[0043] Figure 8 Stereogram of an electric core according to another embodiment of the present utility model.

[0044] Explanation of reference numerals:

[0045] 100, electric core cover assembly; 101, cover plate; 102, upper plastic ring; 1021, first ring body; 1022, plastic ring main body; 1023, second ring body; 103, pole column; 1031, first flange; 1032, second flange; 1033, column body; 1034, second through hole; 104, connecting piece; 1041, first connecting portion; 10411, protruding portion; 1042, second connecting portion; 1043, transition connecting portion; 105, sealing ring; 1051, sealing ring body; 1052, third flange; 106, sealing plate; 107, insulating part; 108, lower plastic sheet; 109, liquid injection hole; 120, third through hole; 130, first through hole; 200, housing; 210, explosion-proof valve; 300, electrode group; 310, electrode tab; 311, bending portion; 3111, first welding area. Detailed implementation manners

[0046] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0047] Below, with reference to Figures 1 to 8 , the embodiments of the present utility model will be described.

[0048] According to the embodiments of the present utility model, on the one hand, with reference to Figures 1 to 4, a battery cell cover plate assembly 100 is provided, including: a cover plate 101, on which there are two first through holes 130, respectively arranged at both ends along the length direction of the cover plate 101; a pair of pole columns 103, respectively installed in the first through holes 130; the pole column 103 includes a column body 1033 and first flanges 1031 and second flanges 1032 arranged at both ends of the column body 1033, and a second through hole 1034 is provided in the axial direction of the pole column 103; a connecting piece 104, on which there is a protruding portion 10411, the protruding portion 10411 is installed in the second through hole 1034 and abuts against the first flange 1031, the second flange 1032 and the column body 1033 respectively, and the connecting piece 104 is installed in the second through hole to realize fixed connection with the pole column 103 through the protruding portion 10411.

[0049] In this embodiment, the cover plate 101 can be a light aluminum plate, and two first through holes 130 are opened at both ends along the length direction of the light aluminum plate. The shape of the first through hole 130 can be circular. By reasonably setting the positions of the first through holes 130, during the process of assembling each component on the cover plate 101, it can enable the operator to more clearly distinguish the uses of through holes at different positions, improve the assembly efficiency, and also enable the operator to quickly locate and handle problems related to specific through holes during maintenance. At the same time, while ensuring the functions of other components on the cover plate 101, the structural strength of the cover plate 101 can be maintained to the greatest extent.

[0050] A pair of terminal posts 103 includes a positive terminal post and a negative terminal post, which are respectively installed in two first through holes 130. The shape of the terminal post 103 is a circular cylinder that matches the shape of the first through hole 130. The shapes of the first through hole 130 and the terminal post 103 can be any shape, not limited to circular, and can be specifically selected according to actual usage requirements. The first flange 1031 and the second flange 1032 at both ends of the cylinder 1033 of the terminal post 103 are respectively located on the upper and lower sides of the first through hole 130. By the abutting cooperation between the first flange 1031 and the second flange 1032 and other components on the battery cell cover assembly 100, the terminal post 103 can be fixedly connected to other components on the battery cell cover assembly 100 without adding additional connecting parts, thereby improving the space utilization rate inside the battery cell. A second through hole 1034 is also provided along the axial direction of the terminal post 103. The second through hole 1034 is coaxially arranged with the cylinder 1033, that is, the central axis of the second through hole 1034 coincides with the central axis of the cylinder 1033. The second through hole 1034 penetrates through the cylinder 1033, the first flange 1031, and the second flange 1032. By providing the second through hole 1034 on the cylinder 1033 of the terminal post 103, the overall weight of the terminal post 103 can be reduced, thereby reducing the overall weight of the battery cell and facilitating the lightweight design of the battery cell. The connecting piece 104 is provided with a protruding portion 10411 that matches the second through hole 1034. After the protruding portion 10411 is inserted into the second through hole 1034, the protruding portion 10411 abuts against the first flange 1031, the second flange 1032, and the cylinder 1033 respectively. By means of welding, seam welding is performed on the outer peripheral side of the protruding portion 10411 to fixedly connect the protruding portion 10411 to the first flange 1031, thereby realizing the electrical connection between the terminal post 103 and the connecting piece 104, facilitating the extraction of the electric quantity inside the battery cell to the outside, and effectively improving the connection efficiency between the terminal post 103 and the connecting piece 104.

[0051] In other embodiments, a strip-shaped hole is provided on the second connecting portion 1042 of the connecting piece 104. When the tab 310 on the electrode group 300 is bent, it can be fixedly connected to the second connecting portion 1042, which can avoid affecting other structures on the connecting piece 104 during the welding of the tab 310 and the second connecting portion 1042.

[0052] In one of the embodiments, the connecting piece 104 includes a first connecting portion 1041, a second connecting portion 1042, and a transition connecting portion 1043 connecting the first connecting portion 1041 and the second connecting portion 1042. The transition connecting portion 1043 enables the first connecting portion 1041 and the second connecting portion 1042 to be in different planes. The protruding portion 10411 is provided on the first connecting portion 1041, and the protruding portion 10411 is provided with a hollow cavity.

[0053] In this embodiment, the bottom of the second flange 1032 abuts against the first connecting portion 1041 of the connecting piece 104; extending away from the upper surface of the first connecting portion 1041 to form a raised portion 10411; the raised portion 10411 is provided with a hollow cavity, which is arranged between the top of the raised portion 10411 and the plane where the first connecting portion 1041 is located; the first connecting portion 1041, the second connecting portion 1042 and the transition connecting portion 1043 are integrally formed. Since in the internal structure of the battery cell, the surface of the tab 310 near one end of the electrode group 300 is slightly convex, the transition connecting portion 1043 makes the first connecting portion 1041 and the second connecting portion 1042 in different planes, and the second connecting portion 1042 is slightly higher than the first connecting portion 1041, which can better fixedly connect the first connecting portion 1041 and the second connecting portion 1042 of the connecting piece 104 with the pole column 103 and the tab 310 respectively, avoiding interference between the connecting piece 104 and other components inside the battery cell, thereby improving the compactness and rationality of the internal structure of the battery cell. By providing a hollow cavity on the raised portion 10411, the usable space inside the battery cell can be further increased, and the space utilization rate inside the battery cell can be improved.

[0054] In one of the embodiments, it further includes an upper plastic ring 102 sleeved on the pole column 103; the upper plastic ring 102 includes a plastic ring main body 1022, a first ring body 1021 arranged on the outer periphery of the plastic ring main body 1022 and a second ring body 1023 arranged on the inner periphery of the plastic ring main body 1022; the second ring body 1023 extends into the first through hole 130; the second ring body 1023 abuts against the column body 1033 and the cover plate 101 respectively; the first flange 1031 abuts against the plastic ring main body 1022 and is arranged inside the first ring body 1021.

[0055] In this embodiment, the upper plastic ring 102 is sleeved on the pole post 103, the main body 1022 of the plastic ring abuts against the top of the cover plate 101, the first flange 1031 at the top of the pole post 103 abuts against the main body 1022 of the plastic ring, and the first ring body 1021 arranged on the outer periphery of the main body 1022 of the plastic ring encloses the first flange 1031 within the first ring body 1021. The second ring body 1023 arranged on the inner periphery of the main body 1022 of the plastic ring extends into the first through hole 130. The second ring body 1023 is arranged between the cover plate 101 and the column body 1033 and abuts against the cover plate 101 and the column body 1033 respectively. Through the mutual abutting and cooperation between the first flange 1031 and the second flange 1032 arranged at both ends of the column body 1033 on the pole post 103 and the first ring body 1021 arranged on the outer periphery of the main body 1022 of the upper plastic ring 102 and the second ring body 1023 arranged on the inner periphery of the main body 1022 of the plastic ring, the upper plastic ring 102 can be fixed between the pole post 103 and the cover plate 101 without adding additional connecting parts, thereby improving the space utilization rate inside the battery cell. During the operation of the battery cell, it may be subject to vibration or impact. The upper plastic ring 102 can also play a buffering role, reducing the direct collision and wear between the pole post 103 and the cover plate 101, and reducing the risk of connection loosening or damage caused by vibration. At the same time, the upper plastic ring 102 has good insulation performance, which can prevent accidental conductive contact between the pole post 103 and the cover plate 101, thereby improving the electrical safety of the battery cell.

[0056] In one of the embodiments, it further includes a sealing ring 105 sleeved on the pole post 103. The sealing ring 105 includes a sealing ring body 1051 and a third flange 1052 at the top of the sealing ring body 1051. The third flange 1052 abuts against the second ring body 1023, and the sealing ring body 1051 abuts against the cover plate 101, the second flange 1032 and the column body 1033 respectively.

[0057] In this embodiment, the sealing ring 105 is sleeved on the pole post 103, and the third flange 1052 at the top of the sealing ring body 1051 abuts against the second ring body 1023, so as to be able to fill the tiny gap between the pole post 103 and the cover plate 101, effectively preventing external dust, moisture and other impurities from entering the battery cell, avoiding short circuit or corrosion inside the battery cell, and ensuring the normal operation and service life of the battery cell. The sealing ring body 1051 abuts against the cover plate 101, the second flange 1032 and the column body 1033 respectively, which can further play a buffering role during the operation of the battery cell, reducing the direct collision and wear between the pole post 103 and the cover plate 101, and reducing the risk of connection loosening or damage caused by vibration.

[0058] In one embodiment, it further includes a lower plastic sheet 108 disposed between the cover plate 101 and the connecting piece 104; a fourth through hole corresponding to the first through hole 130 is provided on the lower plastic sheet 108; the pole column 103 is installed in the fourth through hole.

[0059] In this embodiment, by providing a fourth through hole corresponding to the first through hole 130 on the lower plastic sheet 108, it is convenient for the pole column 103 to pass through the first through hole 130 and the fourth through hole and then be fixedly connected to the connecting piece 104; moreover, the lower plastic sheet 108 has good insulation performance, and disposing the lower plastic sheet 108 between the cover plate 101 and the connecting piece 104 can prevent accidental conductive contact between the pole column 103 and the cover plate 101, further improving the electrical safety of the battery cell.

[0060] In one embodiment, the cover plate 101 further has a plurality of third through holes 120 spaced along the length direction, and the third through holes 120 are disposed between two first through holes 130; a plurality of sealing plates 106 are respectively installed on the plurality of third through holes 120; a liquid injection hole 109 is further provided on the cover plate 101, and the liquid injection hole 109 is disposed between two third through holes 120.

[0061] In this embodiment, two third through holes 120 spaced along the length direction of the cover plate 101 are provided, and sealing plates 106 matching the third through holes 120 are correspondingly installed on the third through holes 120; by providing the third through holes 120, it is convenient to fixedly connect the pole ear 310 to the connecting piece 104 subsequently, and providing the sealing plates 106 on the third through holes 120 helps to improve the overall sealing performance of the battery cell, can effectively prevent electrolyte leakage, reduce the risk of battery cell short circuit, and thus ensure the safety performance and service life of the battery cell. A liquid injection hole 109 is provided on the cover plate 101 at the top of the battery cell, and the liquid injection hole 109 can be disposed between two third through holes 120 and at the center position of the cover plate 101, so that the injected electrolyte is more evenly distributed on the electrode group 300 inside the battery cell, and the electrolyte can also flow into the battery cell more smoothly to improve the liquid injection efficiency.

[0062] In one embodiment, it further includes an insulating member 107 disposed between the lower plastic sheet 108 and the sealing plate 106, and the size of the insulating member 107 is smaller than that of the sealing plate 106; by providing the insulating member 107, conductive contact between the pole ear 310 and the sealing plate 106 can be effectively prevented, thereby improving the electrical safety of the battery cell.

[0063] In other embodiments, a fifth through hole corresponding to the third through hole 120 is provided on the lower plastic sheet 108; after the pole ear 310 passes through the fifth through hole on the lower plastic sheet 108, then passes through the third through hole 120 on the cover plate 101, and then the pole ear 310 is fixedly connected to the connecting piece 104.

[0064] In one embodiment, the upper plastic ring 102, the lower plastic sheet 108, the sealing ring 105, the pole column 103, the connecting piece 104, the sealing plate 106 and the insulating part 107 can all be arranged on the cover plate 101 and assembled into a whole, and supplied in the form of a component, which simplifies the assembly process of the battery cell.

[0065] Second, referring also to Figures 5 to 8 , the present utility model further provides a battery cell, including: a battery cell cover plate assembly 100; a housing 200 having a receiving cavity and an opening communicating with the receiving cavity, and the battery cell cover plate assembly 100 covers the opening; an explosion-proof valve 210 is provided at the bottom of the housing 200; a pole group 300 is arranged in the receiving cavity, pole ears 310 are provided on the pole group 300, and the pole ears 310 are electrically connected to the connecting piece 104 of the battery cell cover plate assembly 100.

[0066] In this embodiment, the housing 200 of the battery cell and the battery cell cover plate assembly 100 form a closed space, which can effectively protect the pole group 300 and other internal components from external physical damage, such as collision, extrusion, etc.; moreover, it can also block dust, moisture and other impurities from entering the receiving cavity, avoid affecting the normal operation of the battery cell, and reduce the occurrence probability of faults such as short circuit and corrosion. The explosion-proof valve 210 is arranged at the central position of the bottom of the housing 200 to prevent the electrolyte from spraying out when the explosion-proof valve 210 is opened, reducing the impact on the surrounding environment and equipment. The pole group 300 is arranged in the receiving cavity and then covered and sealed by the cover plate 101 assembly. This assembly method is simple and efficient, and when it is necessary to maintain or replace the internal components, the cover plate 101 can be relatively conveniently opened for operation. Pole ears 310 are provided on the pole group 300, the pole ears 310 are electrically connected to the connecting piece 104 of the battery cell cover plate assembly 100, and further the pole ears 310 are electrically connected to the pole column 103; among them, the pole ear 310 connected to the positive pole column 103 is the positive pole ear 310, and the pole ear 310 connected to the negative pole column 103 is the negative pole ear 310. By electrically connecting the pole ears 310 to the connecting piece 104 of the battery cell cover plate assembly 100, the intermediate links and resistance of current transmission are reduced, enabling the current to flow more quickly and efficiently between the pole group 300 and the external circuit, and improving the charge and discharge performance of the battery cell.

[0067] In one embodiment, the pole ears 310 are integrally formed with the pole group 300 and extend away from the pole group 300 from the top end surface of the pole group 300. The pole ears 310 are provided with bending portions 311, and the lower surface of the bending portions 311 is fixedly connected to the upper surface of the connecting piece 104.

[0068] In this embodiment, integrally forming the tab 310 and the electrode assembly 300 can increase the connection stability between the tab 310 and the electrode assembly 300, and also avoid the possible poor connection between the tab 310 and the electrode assembly 300, ensuring the stability and reliability of current transmission. By bending the tab 310 to form a bent portion 311 and fixedly connecting the lower surface of the bent portion 311 to the upper surface of the connecting piece 104, the contact area between the tab 310 and the connecting piece 104 is increased, thereby enhancing the connection stability and current transmission ability. Among them, the vertical tab 310 on the electrode assembly 300 can be bent by 90° so that the lower surface of the bent portion 311 of the tab 310 abuts against the second connecting portion 1042. Further, a plurality of tabs 310 are provided on the electrode assembly 300. In the width direction of the electrode assembly 300, two adjacent tabs 310 are arranged oppositely, and the two oppositely arranged tabs 310 are bent toward each other. By arranging the tabs 310 oppositely, the layout can be made more compact, further saving the accommodation space inside the battery cell.

[0069] In one embodiment, the upper surface of the bent portion 311 is a first welding area 3111, and a plurality of embossments are provided on the first welding area 3111.

[0070] In this embodiment, the first welding area 3111 is arranged on the upper surface of the bent portion 311, and the bent portion 311 of the tab 310 is welded to the second connecting portion 1042 of the connecting piece 104 by laser penetration welding or ultrasonic penetration welding. Arranging the welding area on the upper surface of the bent portion 311 facilitates the welding operation and improves the welding accuracy and efficiency. A plurality of embossments are provided on the first welding area 3111. When using laser welding, the laser is vertically irradiated onto the first welding area 3111, and the embossments reflect the laser to avoid the laser light source, reducing the ability of the reflected laser, thereby improving the efficiency of welding the tab 310 and the connecting piece 104 and improving the production efficiency.

[0071] In this embodiment, the battery cell includes, but is not limited to, a lithium-ion battery cell.

[0072] According to an embodiment of the present invention, on the other hand, a battery pack is further provided, including: a plurality of battery cells as described above. A plurality of battery cells form a battery module, and a plurality of battery modules form a battery pack. The battery pack has the same effects as the battery cell and will not be elaborated herein.

[0073] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cover assembly, characterized in that: include: A cover plate, wherein two first through holes are provided on the cover plate, respectively disposed at two ends along the length direction of the cover plate; A pair of poles are installed in the first through hole in a one-to-one correspondence; the poles include a column and a first flange and a second flange provided at both ends of the column, and a second through hole is provided in the axial direction of the pole; A connecting piece, wherein a protrusion is provided on the connecting piece, the protrusion is installed in the second through hole, and respectively abuts against the first flange, the second flange and the column, and the connecting piece is installed through the protrusion and welded in the second through hole to achieve fixed connection with the pole.

2. The battery cover assembly according to claim 1, characterized in that: It also includes an upper plastic ring, which is sleeved on the pole; the upper plastic ring includes a plastic ring body, a first ring body arranged on the outer periphery of the plastic ring body, and a second ring body arranged on the inner periphery of the plastic ring body; the second ring body extends into the first through hole; the second ring body abuts against the column and the cover plate respectively; the first flange abuts against the plastic ring body and is arranged in the first ring body.

3. The battery cover assembly according to claim 2, characterized in that: It also includes a sealing ring, which is sleeved on the pole; The sealing ring comprises a sealing ring body and a third flange on the top of the sealing ring body, the third flange abuts against the second ring body, and the sealing ring body abuts against the cover plate, the second flange and the column respectively.

4. The battery cover assembly according to claim 1, characterized in that: The connecting piece includes a first connecting portion, a second connecting portion and a transition connecting portion connected between the first connecting portion and the second connecting portion, wherein the transition connecting portion enables the first connecting portion and the second connecting portion to be in different planes; The protrusion is arranged on the first connection part, and the protrusion is provided with a hollow cavity.

5. The battery cell cover plate assembly according to any one of claims 1 to 4, characterized in that: It also includes a lower plastic sheet, which is arranged between the cover plate and the connecting sheet; the lower plastic sheet is provided with a fourth through hole corresponding to the first through hole; and the pole is installed in the fourth through hole.

6. The battery cover assembly according to claim 1, characterized in that: The cover plate is further provided with a plurality of third through holes arranged at intervals along the length direction, and the third through holes are arranged between two of the first through holes; A plurality of sealing plates are respectively mounted on the plurality of the third through holes in a one-to-one correspondence; The cover plate is also provided with a liquid injection hole, and the liquid injection hole is arranged between the two third through holes.

7. A battery cell, characterized in that: include: The battery cell cover assembly according to any one of claims 1 to 6; A shell, wherein the shell has a receiving cavity and an opening communicating with the receiving cavity, and the battery cover assembly covers the opening; an explosion-proof valve is provided at the bottom of the shell; The electrode group is arranged in the accommodating cavity, and the electrode group is provided with a pole ear, and the pole ear is electrically connected to the connecting piece of the battery cover assembly.

8. The battery cell according to claim 7, characterized in that: The pole ear is integrally formed with the pole group and extends from the top end surface of the pole group in a direction away from the pole group. The pole ear is provided with a bending portion, and the lower surface of the bending portion is fixedly connected to the upper surface of the connecting piece.

9. The battery cell according to claim 8, characterized in that: The upper surface of the bending portion is a first welding area, and the first welding area is provided with a plurality of embossments.

10. A battery pack, characterized in that: include: A plurality of battery cells according to any one of claims 7 to 9.

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