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, the cover plate is provided with two first through holes, and the two first through holes are 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 arranged at two ends of the pole body; the first plastic part is arranged on the pole in a sleeving manner; the first plastic part comprises a plastic part main body, a first ring body arranged on the outer periphery of the plastic part main body and a second ring body arranged on the inner periphery of the plastic part main body; the second ring body extends into the first through hole; the column body is arranged in the first through hole, and the second ring body abuts against the column body and the cover plate. The first flange abuts against the plastic part body and is arranged in the first ring body. According to the utility model, the first plastic part can be fixed between the pole and the cover plate without adding an additional connecting piece through the mutual abutting fit of the pole and the first plastic part, so that the space utilization rate in the battery cell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cell cover 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 related technologies, a new energy battery is composed of multiple cells, and a cell generally includes a cover assembly, a pole group, a housing, etc. At present, when assembling each component in the cover assembly, additional connecting pieces are required, which results in occupying the internal use space of the cell and reducing the utilization rate of the internal space of the cell. Summary of the Utility Model

[0004] In view of this, the utility model provides a cell cover assembly, a cell and a battery pack to solve the problem of low utilization rate of the internal space of the cell.

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

[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 in a one-to-one correspondence; the pole column includes a column body and a first flange and a second flange arranged at both ends of the column body;

[0008] A first plastic part, sleeved on the pole column; the first plastic part includes a plastic part main body, a first ring body arranged on the outer circumference of the plastic part main body and a second ring body arranged on the inner circumference of the plastic part main body; the second ring body extends into the first through hole;

[0009] The column body is arranged in the first through hole, the second ring body is respectively in contact with the column body and the cover plate; the first flange is in contact with the plastic part main body and is arranged inside the first ring body.

[0010] Beneficial effects: By reasonably setting the position of the first through-hole, during the process of assembling various components 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. Through the mutual abutting and 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 body provided on the outer periphery of the plastic part body and the second ring body provided on the inner periphery of the plastic part body of the first plastic part, the first plastic part 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 first plastic part 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 first plastic part has good insulation performance, which can prevent accidental conductive contact between the pole column and the cover plate, thereby improving the electrical safety of the battery cell.

[0011] In an alternative embodiment, it further includes a sealing ring sleeved on the pole column;

[0012] 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 body respectively.

[0013] Beneficial effects: By sleeving the sealing ring on the pole column, through the cooperation between the third flange at the top of the sealing ring body and the second ring body, it can fill the tiny gaps between the pole column and the cover plate, 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. By abutting the sealing ring body against the cover plate, the second flange, and the column body respectively, it can further play a buffering role during the operation of the battery cell, 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.

[0014] In an alternative embodiment, it further includes a connecting piece. The connecting piece includes a first connecting portion and a second connecting portion, and the first connecting portion is fixedly connected to the second flange.

[0015] Beneficial effects: By clarifying the connection position between the connecting piece and the pole column, it makes the operation during the assembly of the battery cell more convenient. At the same time, during subsequent maintenance and repair, it can also quickly locate and handle problems at the connection part.

[0016] In an alternative embodiment, the surface of the first connecting portion away from the pole column is a welding surface, and a first welding area is provided on the welding surface.

[0017] Beneficial effects: By providing a first welding area on the first connection part, more uniform and stable welding conditions can be provided, thereby enhancing the reliability of the connection. At the same time, by welding the pole column to the connection piece, electrical connection between the pole column and the connection piece can be achieved, improving the conduction efficiency of current between the connection piece and other components.

[0018] In an alternative embodiment, it further includes a lower plastic sheet disposed between the cover plate and the connection piece; a third through hole corresponding to the first through hole is provided on the lower plastic sheet; the pole column is installed in the third through hole.

[0019] Beneficial effects: By providing a third 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 third through hole and then be fixedly connected to the connection piece; moreover, the lower plastic sheet has good insulation performance. Disposing the lower plastic sheet between the cover plate and the connection 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, the cover plate is further provided with a plurality of second through holes spaced apart along the length direction, and the second through holes are disposed between two of the first through holes;

[0021] A plurality of sealing plates are respectively installed corresponding to the plurality of second through holes;

[0022] A liquid injection hole is provided on one of the plurality of sealing plates, and an explosion-proof valve is provided on at least another one of the plurality of sealing plates.

[0023] Beneficial effects: By providing a plurality of second through holes spaced apart along the length direction on the cover plate, installing corresponding sealing plates on the second through holes, and then respectively disposing the explosion-proof valve and the liquid injection hole on different sealing plates; the positions of the explosion-proof valve and the liquid injection hole can be flexibly set, and the explosion-proof valve and the liquid injection hole will not limit the welding area between the connection piece and the tab. When the battery cell needs to have a large overcurrent capacity, the welding area between the connection piece and the tab can be increased, and then the size of the second through hole or the position of the second through hole on the cover plate can be adaptively changed, so as to facilitate increasing the welding area between the connection piece and the tab, effectively improving the overcurrent capacity of the battery cell. Disposing the explosion-proof valve and the liquid injection hole on the sealing plate can also optimize the space utilization inside the battery cell, making the battery cell structure more compact, and further improving the space utilization rate inside the battery cell. Secondly, it also helps to improve the overall sealing performance of the battery cell, effectively preventing electrolyte leakage, reducing the risk of battery cell short circuit, and thus ensuring the safety performance and service life of the battery cell.

[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.

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

[0028] Advantageous 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, avoid affecting the normal operation of the battery cell, and reduce the occurrence probability of faults such as short circuit and corrosion. The pole group is disposed in the receiving cavity and then sealed by the cover plate assembly. This assembly method is simple and efficient, and when it is necessary to maintain or replace internal components, the cover plate can be relatively conveniently opened for operation. By electrically connecting the pole ear 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, and improving the charge and discharge performance of the battery cell.

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

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

[0031] In an optional embodiment, the upper surface of the bent portion is a second welding area, and the second welding area is provided with a plurality of embossings.

[0032] Advantageous effects: Setting the second welding area on the upper surface of the bent portion facilitates welding operations, improves the accuracy and efficiency of welding. By providing a plurality of embossings in the second welding area, when using laser welding, the laser is vertically irradiated onto the second welding area, and the embossings reflect the laser to avoid the laser light source, reducing the ability of the reflected laser, thereby improving the efficiency of welding the pole ear and the connecting piece and improving the production efficiency.

[0033] In a third aspect, the present utility model further provides a battery pack, comprising: a plurality of the above-described battery cells.

[0034] Beneficial effects: Since the battery pack includes the battery cells and has the same effects as the battery cells, they will not be elaborated here. Description of the Drawings

[0035] In order to more clearly illustrate the specific embodiments of the present utility model 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 utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 A perspective view of a battery cell cover assembly according to an embodiment of the present utility model;

[0037] Figure 2 Another perspective view of a battery cell cover assembly according to an embodiment of the present utility model;

[0038] Figure 3 For Figure 1 The top view of the battery cell cover assembly shown;

[0039] Figure 4 For Figure 2 The cross-sectional view along the A-A direction in

[0040] Figure 5 For Figure 4 The partial enlarged view of A in

[0041] Figure 6 A perspective view of a battery cell according to an embodiment of the present utility model;

[0042] Figure 7 For Figure 5 The top view of the battery cell shown;

[0043] Figure 8 For Figure 7 The cross-sectional view along the B-B direction in

[0044] Figure 9 For Figure 8 The partial enlarged view of B in

[0045] Figure 10 A perspective view of a battery cell according to another embodiment of the present utility model;

[0046] Figure 11 For Figure 10 The top view of the battery cell shown;

[0047] Figure 12 is Figure 11 a sectional view along the D-D direction in;

[0048] Figure 13 a perspective view of a battery cell according to another embodiment of the present utility model;

[0049] Figure 14 a perspective view of the cooperation between a connecting piece and a tab in a battery cell according to an embodiment of the present utility model.

[0050] Explanation of reference numerals:

[0051] 100, battery cell cover assembly; 101, cover; 102, first plastic part; 1021, first ring body; 1022, plastic part main body; 1023, second ring body; 103, pole column; 1031, first flange; 1032, second flange; 1033, column body; 104, connecting piece; 1041, first connecting portion; 10411, first welding area; 1042, second connecting portion; 105, sealing ring; 1051, sealing ring body; 1052, third flange; 106, sealing plate; 1061, explosion-proof valve; 1062, liquid injection hole; 107, insulating part; 108, lower plastic sheet; 120, second through hole; 130, first through hole; 121, step surface; 122, large hole; 200, housing; 300, electrode group; 310, tab; 311, bent portion; 3111, second welding area. Detailed implementation manners

[0052] 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.

[0053] The following will be combined with Figures 1 to 14 to describe the embodiments of the present utility model.

[0054] According to the embodiments of the present utility model, on the one hand, with reference to Figures 1 to 5, a battery cell cover plate assembly 100 is provided, including: a cover plate 101, on which two first through holes 130 are provided, 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 in a one-to-one correspondence; the pole column 103 includes a column body 1033 and a first flange 1031 and a second flange 1032 provided at both ends of the column body 1033; a first plastic part 102, sleeved on the pole column 103; the first plastic part 102 includes a plastic part main body 1022, a first ring body 1021 arranged on the outer periphery of the plastic part main body 1022, and a second ring body 1023 arranged on the inner periphery of the plastic part main body 1022; the second ring body 1023 extends into the first through hole 130; the column body 1033 is arranged in the first through hole 130, and the second ring body 1023 is respectively in contact with the column body 1033 and the cover plate 101; the first flange 1031 is in contact with the plastic part main body 1022 and is arranged within the first ring body 1021.

[0055] In this embodiment, two first through holes 130 are opened at both ends along the length direction of the cover plate 101. 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. A pair of pole columns 103 includes a positive pole column and a negative pole column, and are respectively installed in the two first through holes 130. The shape of the pole column 103 is a circular column body matching the shape of the first through hole 130; the shapes of the first through hole 130 and the pole column 103 can be any shape and are not limited to circular, and can be specifically selected according to actual usage requirements.

[0056] Further, the first plastic part 102 is sleeved on the pole post 103, the plastic part main body 1022 is abutted against the top of the cover plate 101, the first flange 1031 at the top of the pole post 103 is abutted against the plastic part main body 1022, and the first ring body 1021 arranged on the outer periphery of the plastic part main body 1022 encloses the first flange 1031 within the first ring body 1021. The second ring body 1023 arranged on the inner periphery of the plastic part main body 1022 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 is respectively abutted against the cover plate 101 and the column body 1033. 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 plastic part main body 1022 and the second ring body 1023 arranged on the inner periphery of the plastic part main body 1022 on the first plastic part 102, the first plastic part 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 first plastic part 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 first plastic part 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.

[0057] In one of the embodiments, a sealing ring 105 is further included and 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 is abutted against the second ring body 1023, and the sealing ring body 1051 is respectively abutted against the cover plate 101, the second flange 1032 and the column body 1033.

[0058] In this embodiment, the sealing ring 105 is sleeved on the pole post 103. By the mutual abutting of the third flange 1052 at the top of the sealing ring body 1051 and the second ring body 1023, the tiny gaps between the pole post 103 and the cover plate 101 can be filled, effectively preventing external dust, moisture and other impurities from entering the inside of the battery cell, avoiding short circuit or corrosion inside the battery cell, and ensuring the normal operation and service life of the battery cell. By respectively abutting the sealing ring body 1051 against the cover plate 101, the second flange 1032 and the column body 1033, it 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.

[0059] In one embodiment, it further includes a connecting piece 104. The connecting piece 104 includes a first connecting portion 1041 and a second connecting portion 1042. The first connecting portion 1041 is fixedly connected to the second flange 1032. Further, the surface of the first connecting portion 1041 away from the pole column 103 is a welding surface, and a first welding area 10411 is provided on the welding surface.

[0060] In this embodiment, the top end face of the first connecting portion 1041 of the connecting piece 104 is fixedly connected to the bottom end face of the second flange 1032 of the pole column 103. Specifically, the connecting piece 104 and the pole column 103 can be fixedly connected by welding; the end face of the first connecting portion 1041 away from the pole column 103, that is, the bottom end face, is the welding surface. A first welding area 10411 is provided on the welding surface. By using laser welding or ultrasonic welding, penetration welding is performed in the first welding area 10411 to fixedly connect the first connecting portion 1041 and the second flange 1032. By clarifying the connection position between the connecting piece 104 and the pole column 103, the operation during the assembly of the battery cell is made more convenient. At the same time, during subsequent maintenance and repair, the problems at the connection part can be quickly located and processed. Moreover, setting the welding area on the first connecting portion 1041 can provide more uniform and stable welding conditions, thereby enhancing the reliability of the connection. At the same time, by welding the pole column 103 to the connecting piece 104, electrical connection between the pole column 103 and the connecting piece 104 can be achieved, and the conduction efficiency of the current between the connecting piece 104 and other components can be improved.

[0061] In other embodiments, a plurality of embossments are provided on the first welding area 10411. When a plurality of embossments are provided on the first welding area 10411 and laser welding is used, the laser is vertically irradiated onto the first welding area 10411, and the embossments reflect the laser to avoid the laser light source, reducing the ability of the reflected laser, thereby improving the efficiency when welding the pole column 103 and the connecting piece 104, improving the production efficiency, and increasing the contact area between the pole column 103 and the connecting piece 104 and improving the weld quality during welding.

[0062] In other embodiments, a strip-shaped hole is provided on the second connecting portion 1042 of the connecting piece 104. After 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 process between the tab 310 and the second connecting portion 1042.

[0063] In other embodiments, the connecting piece 104 further includes a third connecting portion. The first connecting portion 1041 and the second connecting portion 1042 are connected through the third connecting portion. The third connecting portion enables the first connecting portion 1041 and the second connecting portion 1042 not to be on the same horizontal plane, so as to facilitate the connection of the first connecting portion 1041 and the second connecting portion 1042 to the pole column 103 and the pole ear 310 respectively.

[0064] In one of the embodiments, a lower plastic sheet 108 is further included, which is arranged between the cover plate 101 and the connecting piece 104; a third 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 third through hole.

[0065] In this embodiment, by providing a third 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 third through hole and then be fixedly connected to the connecting piece 104; moreover, the lower plastic sheet 108 has good insulation performance. Arranging 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.

[0066] In one of the embodiments, an insulating member 107 is further included, which is arranged between the lower plastic sheet 108 and the sealing plate 106. The size of the insulating member 107 is smaller than that of the sealing plate 106; by providing the insulating member 107, it can effectively prevent conductive contact between the pole ear 210 and the sealing plate 106, thereby improving the electrical safety of the battery cell.

[0067] In one of the embodiments, referring also to Figures 6 to 9 , the cover plate 101 is further provided with a plurality of second through holes 120 arranged at intervals along the length direction. The second through holes 120 are arranged between two first through holes 130; a plurality of sealing plates 106 are respectively installed corresponding to the plurality of second through holes 120; a liquid injection hole 1062 is provided on one of the plurality of sealing plates 106, and at least one of the plurality of sealing plates 106 is provided with an explosion-proof valve 1061.

[0068] In this embodiment, by providing a plurality of second through holes 120 spaced apart along the length direction on the cover plate 101, a sealing plate 106 is correspondingly installed on the second through holes 120, and then the explosion-proof valve 1061 and the liquid injection hole 1062 are respectively arranged on different sealing plates 106; the positions of the explosion-proof valve 1061 and the liquid injection hole 1062 can be flexibly set, and the explosion-proof valve 1061 and the liquid injection hole 1062 will not limit the welding area of the connecting piece 104 and the tab 310; when the cell needs to have a large overcurrent capacity, the welding area of the connecting piece 104 and the tab 310 can be increased, and then the size of the second through hole 120 or the position of the second through hole 120 on the cover plate 101 is adaptively changed, so as to facilitate increasing the welding area of the connecting piece 104 and the tab 310 and effectively improve the overcurrent capacity of the cell. Arranging the explosion-proof valve 1061 and the liquid injection hole 1062 on the sealing plate 106 can also optimize the utilization of the internal space of the cell, make the cell structure more compact, and improve the internal space utilization rate of the cell. Secondly, it also helps to improve the overall sealing performance of the cell, can effectively prevent electrolyte leakage, reduce the risk of cell short circuit, and thus ensure the safety performance and service life of the cell.

[0069] In one embodiment, referring also to Figure 5 , the second through hole 120 is a stepped hole with a larger upper part and a smaller lower part, the sealing plate 106 matches the large hole 122 of the stepped hole, and the sealing plate 106 is installed in the large hole 122 and abuts against the step surface 121 of the stepped hole.

[0070] In this embodiment, the step surface 121 can provide a stable support and positioning for the sealing plate 106, making the contact between the sealing plate 106 and the second through hole 120 closer, and effectively preventing the leakage of gas or liquid. After the sealing plate 106 is installed in the large hole 122, the movement of the sealing plate 106 can be effectively restricted, preventing it from being displaced due to vibration or other external forces during operation, thereby ensuring the reliability of the seal. When installing the sealing plate 106 on the cover plate 101, the stepped hole with a larger upper part and a smaller lower part can also more conveniently place the sealing plate 106 accurately in place.

[0071] In other embodiments, two second through holes 120 can be provided, and the shape of the second through holes 120 can be square, then the sealing plate 106 is a square sealing plate 106 matching the square through hole. An explosion-proof hole is provided at the center position of one of the square sealing plates 106, and the explosion-proof valve 1061 is installed in the explosion-proof hole. A liquid injection hole 1062 is provided at the center position of the other square sealing plate 106. The number and shape of the second through holes 120 can be set according to actual usage requirements and are not specifically limited.

[0072] In other embodiments, a fourth through-hole corresponding to the second through-hole 120 is formed in the lower plastic sheet 108. After the tab 310 passes through the fourth through-hole in the lower plastic sheet 108, it then passes through the second through-hole 120 in the cover plate 101, and then the tab 310 is fixedly connected to the connecting piece 104.

[0073] In one of the embodiments, the first plastic part 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 an integral whole, and supplied in the form of a component, which simplifies the assembly process of the battery cell.

[0074] Second aspect, referring also to Figures 10 to 14 , the present utility model also 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 seals the opening; a pole group 300 disposed in the receiving cavity, the pole group 300 is provided with tabs 310, and the tabs 310 are electrically connected to the connecting piece 104 of the battery cell cover plate assembly 100.

[0075] 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, avoiding affecting the normal operation of the battery cell and reducing the occurrence probability of faults such as short circuit and corrosion. The pole group 300 is disposed in the receiving cavity and then sealed by the cover plate 101 assembly. This assembly method is simple and efficient, and when it is necessary to maintain or replace internal components, the cover plate 101 can be relatively conveniently opened for operation. By electrically connecting the tabs 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.

[0076] In one of the embodiments, the tab 310 is integrally formed with the pole group 300 and extends away from the pole group 300 from the top end surface of the pole group 300. The tab 310 is provided with a bent portion 311, and the lower surface of the bent portion 311 is fixedly connected to the second connecting portion 1042 of the connecting piece 104.

[0077] 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 connecting piece 104, the contact area of the second connecting portion 1042 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 towards each other. By arranging the tabs 310 oppositely, the layout can be made more compact, further saving the accommodation space inside the battery cell.

[0078] In one of the embodiments, the upper surface of the bent portion 311 is a second welding area 3111, and a plurality of embossings are provided on the second welding area 3111.

[0079] In this embodiment, the second welding area 3111 is arranged on the upper surface of the bent portion 311. Through laser welding or ultrasonic welding, and using the penetration welding method, the bent portion 311 of the tab 310 is welded to the second connecting portion 1042 of the connecting piece 104; arranging the welding area on the upper surface of the bent portion 311 facilitates the welding operation and improves the accuracy and efficiency of welding. A plurality of embossings are provided on the second welding area 3111. When using laser welding, the laser is vertically irradiated onto the second welding area 3111, and the embossings reflect the laser to avoid the laser light source, reducing the ability to reflect the laser, thereby improving the welding efficiency when the tab 310 and the connecting piece 104 are welded and improving the production efficiency.

[0080] In this embodiment, the battery cell includes, but is not limited to, a lithium-ion battery cell.

[0081] 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 cells and will not be described in detail herein.

[0082] Although the embodiments of the present invention have been 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 cell cover plate assembly, characterized in that, Comprising: A cover plate, on which two first through-holes are provided, respectively arranged at both ends along the length direction of the cover plate; A pair of pole columns, respectively installed in the first through-holes; the pole columns include column bodies and first flanges and second flanges provided at both ends of the column bodies; A first plastic part, sleeved on the pole columns; the first plastic part includes a plastic part main body, a first ring body arranged on the outer periphery of the plastic part main body, and a second ring body arranged on the inner periphery of the plastic part main body; the second ring body extends into the first through-hole; The column body is arranged in the first through-hole, the second ring body is respectively in contact with the column body and the cover plate; the first flange is in contact with the plastic part main body and is arranged within the first ring body; It further includes a connecting piece, the connecting piece includes a first connecting portion and a second connecting portion, the first connecting portion is fixedly connected to the second flange; the surface of the first connecting portion away from the pole column is a welding surface, and a first welding area is provided on the welding surface.

2. The cell cover plate assembly according to claim 1, wherein It further includes a sealing ring, sleeved on the pole column; The sealing ring includes a sealing ring body and a third flange at the top of the sealing ring body, the third flange is in contact with the second ring body, and the sealing ring body is respectively in contact with the cover plate, the second flange and the column body.

3. The cell cover plate assembly according to claim 1, characterized in that, It further includes a lower plastic sheet, arranged between the cover plate and the connecting piece; a third through-hole corresponding to the first through-hole is provided on the lower plastic sheet; the pole column is installed in the third through-hole.

4. The cell cover plate assembly according to claim 1, wherein The cover plate is further provided with a plurality of second through-holes arranged at intervals along the length direction, and the second through-holes are arranged between the two first through-holes; A plurality of sealing plates, respectively installed on the plurality of second through-holes; A liquid injection hole is provided on one of the plurality of sealing plates, and an explosion-proof valve is provided on at least another one of the plurality of sealing plates.

5. A battery cell, characterized in that, Comprising: The battery cell cover plate assembly according to any one of claims 1 to 4; A housing, which has a receiving cavity and an opening communicating with the receiving cavity, and the battery cell cover plate assembly seals the opening; A pole group, arranged in the receiving cavity, pole tabs are provided on the pole group, and the pole tabs are electrically connected to the connecting piece of the battery cell cover plate assembly.

6. The cell according to claim 5, characterized in that, The pole tabs are integrally formed with the pole group and extend away from the pole group from the top end surface of the pole group, the pole tabs are provided with bending portions, and the lower surface of the bending portions is fixedly connected to the second connecting portion of the connecting piece.

7. The battery cell according to claim 6, characterized in that, The upper surface of the bending portion is a second welding area, and a plurality of embossings are provided on the second welding area.

8. A battery pack, characterized in that, Comprising: A plurality of battery cells according to any one of claims 5 to 7.

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