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 two second through holes arranged at two ends along the length direction of a cover plate, and a first through hole arranged between the two second through holes; the pole columns are mounted in the second 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 top surface of one end of the connecting sheet is fixedly connected with the second flange; the insulating part is abutted between the cover plate and the connecting sheet; fourth through holes corresponding to the second through holes and a plurality of third through holes formed among the fourth through holes at intervals are formed in the insulating part; and the pole is mounted in the fourth through hole. According to the utility model, the pole, the connecting piece and the insulating piece are mutually abutted and matched, so that the insulating piece can be fixed between the connecting piece and the cover plate without adding an additional connecting piece and bending the connecting piece, thereby improving the space utilization rate in the battery cell.

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 related technologies, a new energy battery is composed of multiple cells, and a cell generally includes a cover plate assembly, a pole group, a housing, etc. At present, when connecting a connecting piece in the cover plate assembly to a pole column, the connecting piece needs to be bent multiple times and then fixedly connected to the pole column, 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 plate 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 plate assembly, including:

[0006] A cover plate, on which a first through hole and two second through holes are provided. The two second through holes are respectively arranged at both ends along the length direction of the cover plate, and the first through hole is arranged between the two second through holes;

[0007] A pair of pole columns, which are respectively installed in the second through holes; 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 connecting piece, one end top surface of which is fixedly connected to the second flange;

[0009] An insulating member, which is abutted between the cover plate and the connecting piece; the insulating member is provided with a fourth through hole corresponding to the second through hole and a plurality of third through holes arranged at intervals between the fourth through holes; the pole column is installed in the fourth through hole.

[0010] Beneficial effects: By reasonably setting the positions of the first through-hole and the second 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. Moreover, while ensuring the functions of other components on the cover plate, it maximally maintains the structural strength of the cover plate. Through the mutual cooperation between the first flange and the second flange provided at both ends of the column body on the pole column and the connecting piece, the insulating part can be fixed to the connecting piece and the cover plate without adding additional connecting parts, and there is no need to bend the connecting piece, improving the space utilization rate inside the battery cell. By providing a fourth through-hole corresponding to the second through-hole on the insulating part, it is convenient for the pole column to pass through the second through-hole and the fourth through-hole and then be fixedly connected to the connecting piece. Moreover, the insulating part has good insulation performance. Setting the insulating part between the cover plate and the connecting piece can prevent accidental conductive contact between the pole column and the cover plate, improving the electrical safety of the battery cell.

[0011] In an alternative embodiment, 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, and the transition connecting portion positions the first connecting portion and the second connecting portion in different planes.

[0012] 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 using the transition connecting portion to position the two first connecting portions and the second connecting portion in different planes, and the second connecting portion is slightly higher than the first connecting portion, it can better fixedly connect 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.

[0013] In an alternative embodiment, a first welding area is provided on the bottom end face of the first connecting portion, and the first welding area is provided with a plurality of embossments.

[0014] Beneficial effects: By providing a first welding area on the first connecting portion, it can provide more uniform and stable welding conditions, thereby enhancing the reliability of the connection. At the same time, by welding the pole column to the connecting piece, electrical connection between the pole column and the connecting piece can be achieved, improving the conduction efficiency of current between the connecting piece and other components. By providing a plurality of embossments in the first welding area, when using laser welding, the laser irradiates vertically onto the first welding area, and the embossments reflect the laser to avoid the laser light source, reducing the ability to reflect the laser, thereby improving the welding efficiency between the pole column and the connecting piece and improving the production efficiency.

[0015] 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 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 second through hole;

[0016] The column body is arranged in the second through hole, and the second ring body is in contact with the column body and the cover plate respectively; the first flange abuts against the plastic ring body and is arranged within the first ring body.

[0017] Beneficial effects: 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 arranged on the outer periphery of the plastic ring body and the second ring body arranged 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.

[0018] In an alternative embodiment, it further includes a sealing ring sleeved on the pole column;

[0019] 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 is in contact with the cover plate, the insulating part, the second flange, and the column body respectively.

[0020] Beneficial effects: The sealing ring is sleeved 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. The sealing ring body is in contact with the cover plate, the insulating part, the second flange, and the column body respectively, which 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.

[0021] In an alternative embodiment, it further includes a sealing plate installed on the first through hole. The sealing plate is provided with an explosion-proof valve and a liquid injection hole.

[0022] Beneficial effects: Installing the sealing plate at the first through-hole can specifically seal the first through-hole, enhancing the overall sealing effect, better preventing electrolyte leakage or external impurities from entering, and ensuring the normal operation and safety of the battery cell. By arranging the explosion-proof valve and the liquid injection hole on the sealing plate, the explosion-proof valve and the liquid injection hole will not limit the welding area of the connecting piece and the tab; when the battery cell needs to have a large over-current capacity, the welding area of the connecting piece and the tab can be increased, and then the size of the first through-hole or the position of the first through-hole on the cover plate can be adaptively changed, so as to facilitate increasing the welding area of the connecting piece and the tab and effectively improving the over-current capacity of the battery cell. Arranging 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 improving the internal space utilization rate of 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.

[0023] In a second aspect, the present utility model also provides a battery cell, comprising:

[0024] The battery cell cover plate assembly as described above;

[0025] A housing having a receiving cavity and an opening communicating with the receiving cavity, and the battery cell cover plate assembly seals the opening;

[0026] A pole group disposed in the receiving cavity, with tabs provided on the pole group, and the tabs being electrically connected to the connecting pieces of the battery cell cover plate assembly.

[0027] 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. 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 tabs to the connecting pieces 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.

[0028] In an optional embodiment, the tab is integrally formed with the pole group and extends away from the pole group from the top end surface of the pole group. The tab 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.

[0029] Beneficial effects: Integrating the tab and the electrode assembly can increase the connection stability between the tab and the electrode assembly, and also avoid the possible poor connection between the tab and the electrode assembly, 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.

[0030] In an optional embodiment, the upper surface of the bent portion is a second welding area.

[0031] Beneficial effects: Setting the welding area on the upper surface of the bent portion facilitates the welding operation and improves the accuracy and efficiency of welding.

[0032] In a third aspect, the present invention further provides a battery pack, including: a plurality of battery cells as described above.

[0033] Beneficial effects: 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

[0034] 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 drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0035] Figure 1 It is a perspective view of a battery cell cover assembly according to an embodiment of the present invention;

[0036] Figure 2 It is another perspective view of a battery cell cover assembly according to an embodiment of the present invention;

[0037] Figure 3 For Figure 1 the top view of the battery cell cover assembly shown;

[0038] Figure 4 For Figure 3 the cross-sectional view taken along the A-A direction in

[0039] Figure 5 For Figure 4 the partial enlarged schematic view of A in

[0040] Figure 6 It is a perspective view of a battery cell according to an embodiment of the present invention;

[0041] Figure 7 is Figure 6 a top view of the battery cell shown;

[0042] Figure 8 is Figure 7 a sectional view taken along the B-B direction in;

[0043] Figure 9 a perspective view of a battery cell according to another embodiment of the present invention;

[0044] Figure 10 is Figure 9 a top view of the battery cell shown;

[0045] Figure 11 is Figure 10 a sectional view taken along the C-C direction in;

[0046] Figure 12 a perspective view of a battery cell according to another embodiment of the present invention;

[0047] Figure 13 a perspective view of the cooperation between the connecting piece and the tab in a battery cell according to an embodiment of the present invention.

[0048] Explanation of reference numerals:

[0049] 100, battery cell cover assembly; 101, cover; 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; 104, connecting piece; 1041, first connecting portion; 10411, first welding area; 1042, second connecting portion; 1043, transition connecting portion; 105, sealing ring; 1051, sealing ring body; 1052, third flange; 106, sealing plate; 1061, explosion-proof valve; 1062, liquid injection hole; 107, second insulating member; 108, insulating member; 1081, third through hole; 1082, fourth through hole; 1083, fifth through hole; 120, first through hole; 130, second through hole; 121, step surface; 122, large hole; 200, housing; 300, electrode group; 310, tab; 311, bending portion; 3111, second welding area. Detailed implementation manners

[0050] 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.

[0051] The following will describe the embodiments of the present utility model in conjunction with Figures 1 to 13 , to describe the embodiments of the present utility model.

[0052] According to an embodiment of the present utility model, on the one hand, with reference to Figures 1 to 5 , a cell cover plate assembly 100 is provided, including: a cover plate 101, on which a first through hole 120 and two second through holes 130 are provided. The two second through holes 130 are respectively arranged at both ends along the length direction of the cover plate 101, and the first through hole 120 is arranged between the two second through holes 130; a pair of pole columns 103, which are respectively installed in the second 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 connecting piece 104, the top surface of one end of the connecting piece is fixedly connected to the second flange 1032; an insulating member 108, which abuts between the cover plate 101 and the connecting piece 104; the insulating member 108 is provided with a fourth through hole 1082 corresponding to the second through hole 130 and a plurality of third through holes 1081 arranged at intervals between the fourth through holes 1082; the pole column 103 is installed in the fourth through hole 1082.

[0053] In this embodiment, the cover plate 101 can be a light aluminum plate. By opening two second through holes 130 at both ends along the length direction of the light aluminum plate, and a first through hole 120 is also opened between the two second through holes 130. The shape of the second through hole 130 can be circular. By reasonably setting the positions of the first through hole 120 and the second through hole 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. It can also, while ensuring the functions of other components on the cover plate 101, maintain the structural strength of the cover plate 101 to the greatest extent. A pair of pole columns 103 includes a positive pole column and a negative pole column, which are respectively installed in the two second through holes 130. The shape of the pole column 103 is a circular column body matching the shape of the second through hole 130; the shapes of the second 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.

[0054] Further, the insulating member 108 abuts between the cover plate 101 and the connecting piece 104. The insulating member 108 is provided with a fourth through hole 1082 corresponding to the second through hole 130 and a plurality of third through holes 1081 spaced apart between the fourth through holes 1082. After the pole column 103 passes through the second through hole 130 and the fourth through hole 1082 in sequence, one end top surface of the connecting piece 104 is fixedly connected to the bottom end surface of the second flange 1032 of the pole column 103, and there is no need to bend the connecting piece 104. Specifically, the connecting piece 104 and the pole column 103 can be fixedly connected by welding. By providing the fourth through hole 1082 on the insulating member 108, it is convenient to weld and fix the connecting piece 104 and the pole column 103 together through the fourth through hole 1082. At the same time, the insulating member 108 has good insulation performance. Setting the insulating member 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, improving the electrical safety of the battery cell.

[0055] In one embodiment, 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 positions the first connecting portion 1041 and the second connecting portion 1042 in different planes.

[0056] In this embodiment, the second flange 1032 abuts on the first connecting portion 1041 of the connecting piece 104. 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 the electrode group 300 is slightly convex, by using the transition connecting portion 1043 to position the two first connecting portions 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, it can better fixedly connect the first connecting portion 1041 and the second connecting portion 1042 of the connecting piece 104 to 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.

[0057] In one embodiment, the bottom end surface of the first connecting portion 1041 is provided with a first welding area 10411, and the first welding area 10411 is provided with a plurality of embossments.

[0058] In this embodiment, the end face of the first connecting portion 1041 away from the pole post 103, that is, the bottom end face, is the welding surface. A first welding area 10411 is provided on the welding surface. Through 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 post 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 of the connection part can be quickly located and processed. Moreover, by setting the welding area on the first connecting portion 1041, more uniform and stable welding conditions can be provided, thereby enhancing the reliability of the connection. At the same time, by welding the pole post 103 to the connecting piece 104, electrical connection between the pole post 103 and the connecting piece 104 can be achieved, improving the conduction efficiency of the current between the connecting piece 104 and other components. Further, a plurality of embossments are provided in the first welding area 10411. When using laser welding, 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 welding efficiency between the pole post 103 and the connecting piece 104, improving the production efficiency, and also increasing the contact area between the pole post 103 and the connecting piece 104 and improving the weld quality during welding.

[0059] In other embodiments, a strip-shaped hole is provided on the second connecting portion 1042 of the connecting piece 104. By providing the strip-shaped hole on the second connecting portion 1042, when the tab 310 is welded to the second connecting portion, the influence on other structures on the connecting piece 104 during the welding process between the tab 310 and the second connecting portion 1042 can be avoided.

[0060] In one of the embodiments, it further includes an upper plastic ring 102 sleeved on the pole post 103. The upper plastic ring 102 includes a plastic ring main body 1022, a first ring body 1021 provided on the outer periphery of the plastic ring main body 1022, and a second ring body 1023 provided on the inner periphery of the plastic ring main body 1022. The second ring body 1023 extends into the second through hole 130. A column body 1033 is provided in the second through hole 130, and the second ring body 1023 is in contact with the column body 1033 and the cover plate 101 respectively. The first flange 1031 abuts against the plastic ring main body 1022 and is provided within the first ring body 1021.

[0061] In this embodiment, the upper plastic ring 102 is sleeved on the pole column 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 column 103 abuts against the main body 1022 of the plastic ring, and the first ring body 1021 arranged on the outer circumference 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 circumference of the main body 1022 of the plastic ring extends into the second 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 provided at both ends of the column body 1033 on the pole column 103 and the first ring body 1021 arranged on the outer circumference of the main body 1022 of the upper plastic ring 102 and the second ring body 1023 arranged on the inner circumference of the main body 1022 of the plastic ring, the upper plastic ring 102 can be fixed between the pole column 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 column 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 column 103 and the cover plate 101, thereby further improving the electrical safety of the battery cell.

[0062] In one of the embodiments, it further includes a sealing ring 105 sleeved on the pole column 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 insulating part 108, the second flange 1032 and the column body 1033 respectively.

[0063] In this embodiment, the sealing ring 105 is sleeved on the pole column 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 column 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 abutting the four sides of the sealing ring body 1051 against the cover plate 101, the insulating part 108, the second flange 1032 and the column body 1033 respectively, it can further play a buffering role during the operation of the battery cell, and reduce the direct collision and wear between the pole column 103 and the cover plate 101, and reduce the risk of connection loosening or damage caused by vibration.

[0064] In one of the embodiments, see also Figures 6 to 8, further comprising a sealing plate 106 installed on the first through hole 120, and an explosion-proof valve 1061 and a liquid injection hole 1062 are provided on the sealing plate 106.

[0065] In this embodiment, installing the sealing plate 106 at the first through hole 120 can specifically seal the first through hole 120, enhancing the overall sealing effect, better preventing electrolyte leakage or external impurities from entering, and ensuring the normal operation and safety of the battery cell. By arranging the explosion-proof valve 1061 and the liquid injection hole 1062 on the sealing plate 106, the explosion-proof valve 1061 and the liquid injection hole 1062 will not limit the welding area between the connecting piece 104 and the pole ear 310; when the battery cell needs to have a large overcurrent capacity, the welding area between the connecting piece 104 and the pole ear 310 can be increased, and then the size of the first through hole 120 or the position of the first through hole 120 on the cover plate 101 can be adaptively changed, so as to facilitate increasing the welding area between the connecting piece 104 and the pole ear 310 and effectively improving the overcurrent capacity of the battery cell. Arranging the explosion-proof valve 1061 and the liquid injection hole 1062 on the sealing plate 106 can also optimize the space utilization inside the battery cell, making the battery cell structure more compact and improving the internal space utilization rate of the battery cell. Secondly, it 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.

[0066] In one of the embodiments, also referring to Figure 5 , the first 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.

[0067] 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 first through hole 120 closer, effectively preventing gas or liquid leakage. After installing the sealing plate 106 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, thus 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.

[0068] In one embodiment, the insulating member 108 is further provided with a plurality of fifth through holes 1083, which are arranged between two third through holes 1081, and the positions of the fifth through holes 1083 correspond to those of the explosion-proof valves 1061. By providing the fifth through holes 1083, when it is necessary to exhaust the gas inside the battery cell, the gas can be discharged from the fifth through holes 1083 and discharged to the outside from the explosion-proof valves 1061 corresponding to the fifth through holes 1083, so as to quickly exhaust the gas inside the battery cell.

[0069] In one embodiment, it further includes a second insulating member 107, which is arranged between the insulating member 108 and the sealing plate 106, and the size of the second insulating member 107 is smaller than that of the sealing plate 106; by providing the second insulating member 107, it can effectively prevent conductive contact between the tab 310 and the sealing plate 106, thereby improving the electrical safety of the battery cell.

[0070] In one embodiment, the upper plastic ring 102, the insulating member 108, the sealing ring 105, the pole column 103, the connecting piece 104, the sealing plate 106 and the second insulating member 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.

[0071] Second, referring also to Figures 9 to 13 , the present invention 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, and tabs 310 are provided on the pole group 300, and the tabs 310 are electrically connected to the connecting pieces 104 of the battery cell cover plate assembly 100.

[0072] 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 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 the internal components, the cover plate 101 can also be opened relatively conveniently for operation. By electrically connecting the tabs 310 to the connecting pieces 104 of the battery cell cover plate assembly 100, the intermediate links and resistance of current transmission are reduced, and the current can flow more quickly and efficiently between the pole group 300 and the external circuit, improving the charge and discharge performance of the battery cell.

[0073] In one embodiment, the tab 310 is integrally formed with the electrode group 300 and extends away from the top end surface of the electrode 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.

[0074] In this embodiment, integrally forming the tab 310 with the electrode group 300 can increase the connection stability between the tab 310 and the electrode group 300, and also avoid the possible poor connection between the tab 310 and the electrode group 300, ensuring the stability and reliability of current transmission. The tab 310 extends away from the top end surface of the electrode group 300 and sequentially passes through the third through hole 1081 and the first through hole 120; further, the tab 310 is bent to form 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, increasing the contact area between the tab 310 and the second connecting portion 1042 of the connecting piece 104, thereby enhancing the connection stability and current transmission ability; among them, the vertical tab 310 on the electrode group 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 group 300, and in the width direction of the electrode group 300, two adjacent tabs 310 are oppositely arranged. By arranging the tabs 310 oppositely, the two oppositely arranged tabs 310 are bent towards each other, which can make the layout more compact and further save the accommodation space inside the battery cell.

[0075] In one embodiment, the upper surface of the bent portion 311 is the second welding area 3111.

[0076] 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 is convenient for welding operations and improves the accuracy and efficiency of welding.

[0077] In other embodiments, a plurality of embossments are provided on the second welding area 3111. By providing a plurality of embossments on the second welding area 3111, when using laser welding, the laser is vertically irradiated onto the second 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.

[0078] In this embodiment, the battery cell includes, but is not limited to, a lithium-ion battery cell.

[0079] According to an embodiment of the present utility model, on the other hand, a battery pack is further provided, including: a plurality of the above-described battery cells. 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, which will not be elaborated herein.

[0080] Although the embodiments of the present utility model 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 utility model, 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 a first through hole and two second through holes are provided on the cover plate, the two second through holes are respectively provided at two ends along the length direction of the cover plate, and the first through hole is provided between the two second through holes; A pair of poles are installed in the second through holes in a one-to-one correspondence; the poles include a column body and a first flange and a second flange provided at two ends of the column body; A connecting piece, a top surface of one end of which is fixedly connected to the second flange; An insulating member is abutted between the cover plate and the connecting piece; the insulating member is provided with a fourth through hole corresponding to the second through hole and a plurality of third through holes arranged at intervals between the fourth through holes; the pole is installed in the fourth through hole.

2. 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 located in different planes.

3. The battery cover assembly according to claim 2, characterized in that: A first welding area is provided on the bottom end surface of the first connecting portion, and a plurality of embossments are provided on the first welding area.

4. 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 second through hole; The column is arranged in the second through hole, and the second ring body is respectively in contact with the column and the cover plate; the first flange is in contact with the plastic ring body and is arranged in the first ring body.

5. The battery cover assembly according to claim 4, characterized in that: It also includes a sealing ring, which is sleeved on the pole; The sealing ring includes 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 insulating member, the second flange and the column respectively.

6. The battery cell cover plate assembly according to any one of claims 1 to 5, characterized in that: It also includes a sealing plate installed on the first through hole, and the sealing plate is provided with an explosion-proof valve and a liquid injection hole.

7. A battery cell, characterized in that: include: The 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 cell cover plate assembly covers the opening; 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 second connecting portion of the connecting sheet.

9. The battery cell according to claim 8, characterized in that: The upper surface of the bent portion is a second welding area.

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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