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 first cover plate and a second cover plate, and a first through hole, a second through hole, a third through hole and a fourth through hole are respectively formed in the length directions of the two cover plates; the first pole and the second pole are respectively arranged in the first through hole and the third through hole, and the first pole comprises a first pole body, and a first flange and a second flange which are arranged at two ends of the first pole body; the second post comprises a second post body, and a third flange and a fourth flange which are arranged at two ends of the second post body; a center hole is formed in the center of the first column body and penetrates through the second flange; the connecting piece is provided with a connecting column, and the connecting column is matched with the center hole; and the connecting sheet is fixedly connected with the first polar column through the connecting column. According to the battery cell cover plate assembly, components on the battery cell cover plate assembly are fixed through mutual abutting fit between the pole and the cover plate, and additional connecting pieces do not need to be added.

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, additional connecting pieces are required for assembling each component in the cover plate assembly, which thus occupies the internal use space of the cell and reduces 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 first cover plate, on which a first through hole and a second through hole are provided along the length direction of the first cover plate;

[0007] A second cover plate, on which a third through hole and a fourth through hole are provided along the length direction of the second cover plate;

[0008] A first pole, arranged in the first through hole, the first pole including a first column body and a first flange and a second flange arranged at both ends of the first column body;

[0009] A second pole, arranged in the third through hole, the second pole including a second column body and a third flange and a fourth flange arranged at both ends of the second column body;

[0010] A central hole is provided at the center of the first column body, and the central hole penetrates through the second flange;

[0011] A connecting piece, on which a connecting column is provided; the connecting column is matched with the central hole; the connecting piece is fixedly connected with the first pole through the connecting column.

[0012] Beneficial effects: By providing a first through-hole and a second through-hole on the first cover plate and a third through-hole and a fourth through-hole on the second cover plate, during the process of assembling various components on the cover plate, it enables operators to more clearly distinguish the uses of through-holes at different positions, improving the assembly efficiency. It also enables operators 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.

[0013] Then, the first pole column and the second pole column are respectively installed into the first through-hole and the third through-hole, such that the first flange and the second flange at both ends of the first column body of the first pole column are respectively located on the upper and lower sides of the first through-hole, and the third flange and the fourth flange at both ends of the second column body of the second pole column are respectively located on the upper and lower sides of the third through-hole. Through the abutting cooperation of the first flange and the second flange, and the third flange and the fourth flange with other components on the cell cover plate assembly, the first pole column and the second pole column can be fixedly connected to other components on the cell cover plate assembly without adding additional connecting parts, thereby improving the space utilization rate inside the cell. By providing a central hole in the center of the first column body, providing a connecting post on the connecting piece that matches the central hole, and after inserting the connecting post into the central hole, the first pole column is fixedly connected to the connecting piece through the connecting post, thereby realizing the electrical connection between the first pole column and the connecting piece, facilitating the extraction of the electrical quantity inside the cell to the outside, and effectively improving the connection efficiency between the first pole column and the connecting piece.

[0014] In an alternative embodiment, a first guiding rib is provided on one side of the second flange close to the central hole;

[0015] A counterbore is provided on the top of the first flange, and the counterbore is provided on the top of the central hole and is coaxial with the central hole.

[0016] Beneficial effects: By providing a first guiding rib on one side of the second flange close to the central hole, it is relatively convenient to insert the connecting post of the connecting piece into the central hole, thereby improving the assembly efficiency. By providing a counterbore on the top of the first flange, the counterbore can be used as a welding area. After the connecting post of the connecting piece is inserted into the central hole, welding is performed at the counterbore to fixedly connect the connecting post and the first pole column together, thereby realizing the electrical connection between the connecting piece and the first pole column; the counterbore can also prevent the weld mark formed by welding from protruding from the top end face of the first flange.

[0017] In an alternative embodiment, a second guiding rib is provided at one end of the connecting post away from the connecting piece.

[0018] Beneficial effects: By providing a second guiding rib at one end of the connecting post away from the connecting piece, during the process of inserting the connecting post of the connecting piece into the central hole, through the mutual cooperation of the first guiding rib and the second guiding rib, it is more convenient to assemble the connecting post of the connecting piece into the central hole.

[0019] In an alternative embodiment, 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. The transition connecting portion places the first connecting portion and the second connecting portion in different planes, and the connecting post is provided on the first connecting portion.

[0020] 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, the two first connecting portions and the second connecting portion are placed in different planes through the transition connecting portion, and the second connecting portion is slightly higher than the first connecting portion, which can better fixedly connect the first connecting portion and the second connecting portion of the connecting piece to the pole post 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.

[0021] In an alternative embodiment, it further includes a first plastic part sleeved on the first pole post; the first plastic part includes a plastic part main body and a first ring body provided on the outer periphery of the plastic part main body;

[0022] The first flange abuts against the top of the plastic part main body and is arranged inside the first ring body; the bottom of the plastic part main body abuts against the first cover plate.

[0023] Beneficial effects: Through the mutual abutting and cooperation between the first flange and the second flange provided at both ends of the first column body on the first pole post and the plastic part main body of the first plastic part and the first ring body provided on the outer periphery of the plastic part main body, the first plastic part can be fixed between the first pole post and the first 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 subjected to vibration or impact. The first plastic part can also play a buffering role, reducing the direct collision and wear between the first pole post and the first 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 first pole post and the first cover plate, thereby improving the electrical safety of the battery cell.

[0024] In an alternative embodiment, it further includes a sealing ring sleeved on the first pole post;

[0025] The sealing ring includes a sealing ring body and a second ring body at the top of the sealing ring body. The second ring body abuts against the plastic part main body, and the sealing ring body abuts against the first cover plate, the second flange, and the first column body respectively.

[0026] Beneficial effects: By sleeving the sealing ring on the first pole column, through the cooperation between the second ring body at the top of the sealing ring body and the plastic part body, the tiny gap between the first pole column and the first cover plate can be filled, effectively preventing external dust, moisture and other impurities from entering the battery core, avoiding short circuit or corrosion inside the battery core, and ensuring the normal operation and service life of the battery core. By making the sealing ring body abut against the first cover plate, the second flange and the first column respectively, it can further play a buffering role during the operation of the battery core, reduce the direct collision and wear between the first pole column and the first cover plate, and reduce the risk of connection loosening or damage caused by vibration.

[0027] In an alternative embodiment, an explosion-proof valve and a liquid injection hole are further provided on the second cover plate, and the explosion-proof valve is installed in the fourth through hole.

[0028] Beneficial effects: By arranging the explosion-proof valve in the fourth through hole, certain support and fixation can be provided for the explosion-proof valve, making the explosion-proof valve more stable during operation and reducing the risk of failure caused by loosening or displacement. By arranging the explosion-proof valve and the liquid injection hole on the second cover plate, the overall structure of the second cover plate can be made more compact, saving the internal space of the battery core, thereby improving the space utilization rate inside the battery core.

[0029] In a second aspect, the present utility model further provides a battery core, comprising:

[0030] The battery core cover plate assembly as described above;

[0031] A housing having a receiving cavity and two openings communicating with both ends of the receiving cavity, and the first cover plate and the second cover plate in the battery core cover plate assembly seal the two openings;

[0032] A pole group disposed in the receiving cavity, one end of the pole group is fixedly connected to the second cover plate, and a pole tab is provided at the other end of the pole group, and the pole tab is electrically connected to the connecting piece of the battery core cover plate assembly.

[0033] Beneficial effects: The housing of the battery core and the battery core 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 core, and reduce the occurrence probability of faults such as short circuit and corrosion. By 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 internal components, the first cover plate or the second cover plate can be relatively conveniently opened for operation. By electrically connecting the pole tab to the connecting piece of the battery core 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 core.

[0034] In an alternative embodiment, the tab is integrally formed with the electrode assembly and extends away from the electrode assembly from the top end surface of the electrode assembly. 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.

[0035] Advantages: Integrally forming the tab with 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 between the tab and the second connecting portion of the connecting piece is increased, thereby enhancing the connection stability and current transmission ability.

[0036] In a third aspect, the present utility model further provides a battery pack, comprising: a plurality of battery cells as described above.

[0037] Advantages: Since the battery pack includes battery cells, it has the same effects as the battery cells, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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 drawings in the following description 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.

[0039] Figure 1 Is a perspective view of the first cover in a battery cell cover assembly according to an embodiment of the present utility model;

[0040] Figure 2 Is Figure 1 The top view of the first cover shown;

[0041] Figure 3 Is Figure 2 The cross-sectional view along the A-A direction in;

[0042] Figure 4 Is Figure 3 The partial enlarged schematic view of A in;

[0043] Figure 5 Is Figure 1 The bottom view of the first cover shown;

[0044] Figure 6 Is a perspective view of the second cover in a battery cell cover assembly according to an embodiment of the present utility model;

[0045] Figure 7 is Figure 6 the top view of the second cover plate shown;

[0046] Figure 8 is Figure 7 the cross-sectional view taken along the B-B direction in;

[0047] Figure 9 the perspective view of the connecting piece in a cell cover plate assembly according to an embodiment of the present invention;

[0048] Figure 10 the perspective view of a cell according to an embodiment of the present invention;

[0049] Figure 11 is Figure 10 the top view of the cell shown;

[0050] Figure 12 is Figure 11 the cross-sectional view taken along the C-C direction in;

[0051] Figure 13 is Figure 12 the partial enlarged schematic view of B in;

[0052] Figure 14 the perspective view of a cell according to another embodiment of the present invention;

[0053] Figure 15 the perspective view of a cell according to another embodiment of the present invention;

[0054] Figure 16 is Figure 15 the top view of the cell shown.

[0055] Explanation of reference numerals:

[0056] 100, cell cover assembly; 110, first cover; 120, first pole; 121, first cylinder; 1211, central hole; 122, first flange; 1221, counterbore; 1222, welding rib; 123, second flange; 1231, first guiding rib; 130, connecting piece; 131, first connecting part; 132, second connecting part; 133, transitional connecting part; 134, connecting column; 1341, second guiding rib; 140, first plastic part; 141, first ring; 142, plastic part body; 150, sealing ring; 151, sealing ring body; 152, second ring; 160, second through hole; 170, sealing plate; 180, first through hole; 210, second cover; 220, second pole; 221, second cylinder; 222, third flange; 223, fourth flange; 230, explosion-proof valve; 240, liquid injection hole; 250, fourth through hole; 260, third through hole; 200, housing; 300, electrode group; 310, tab; 311, bent part. Detailed implementation mode

[0057] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0058] The following combines Figures 1 to 16 , to describe the embodiments of the present utility model.

[0059] According to the embodiments of the present utility model, on the one hand, with reference to Figures 1 to 9 , a cell cover assembly 100 is provided, including: a first cover 110, with a first through hole 180 and a second through hole 160 provided along the length direction of the first cover 110; a second cover 210, with a third through hole 260 and a fourth through hole 250 provided along the length direction of the second cover 210; a first pole 120, arranged in the first through hole 180, the first pole 120 including a first cylinder 121 and a first flange 122 and a second flange 123 provided at both ends of the first cylinder 121; a second pole 220, arranged in the third through hole 260, the second pole 220 including a second cylinder 221 and a third flange 222 and a fourth flange 223 provided at both ends of the second cylinder 221; a central hole 1211 is provided at the center of the first cylinder 121, and the central hole 1211 penetrates through the second flange 123; a connecting piece 130, with a connecting column 134 provided on the connecting piece 130; the connecting column 134 is matched with the central hole 1211; the connecting piece 130 is fixedly connected to the first pole 120 through the connecting column 134.

[0060] In this embodiment, by providing a first through hole 180 and a second through hole 160 on the first cover plate 110 and a third through hole 260 and a fourth through hole 250 on the second cover plate 210, wherein the shape of each through hole can be arbitrary as long as it meets the actual use requirements. During the process of assembling each component on the cover plate, 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. Moreover, while ensuring the functions of other components on the cover plate, it can maintain the structural strength of the cover plate to the greatest extent.

[0061] Furthermore, the first pole 120 and the second pole 220 are respectively a positive pole and a negative pole, and the first pole 120 can be used as the positive pole or the negative pole according to the actual situation. The first pole 120 and the second pole 220 are respectively installed into the first through hole 180 and the third through hole 260, so that the first flange 122 and the second flange 123 at both ends of the first column 121 of the first pole 120 are respectively located on the upper and lower sides of the first through hole 180, and the third flange 222 and the fourth flange 223 at both ends of the second column 221 of the second pole 220 are respectively located on the upper and lower sides of the third through hole 260. Through the abutting cooperation between the first flange 122 and the second flange 123 and the third flange 222 and the fourth flange 223 with other components on the battery cell cover plate assembly 100, the first pole 120 and the second pole 220 can be fixedly connected to other components on the battery cell cover plate assembly 100 without adding additional connecting parts, thereby improving the space utilization rate inside the battery cell. A central hole 1211 is provided at the center of the first column 121. After a connecting column 134 matching the central hole 1211 is inserted into the central hole 1211, it is fixedly connected to the first pole 120 through the connecting column 134, thereby realizing the electrical connection between the first pole 120 and the connecting piece 130, facilitating the extraction of the electric quantity inside the battery cell to the outside, and effectively improving the connection efficiency between the first pole 120 and the connecting piece 130.

[0062] In one embodiment, a first guiding rib 1231 is provided on one side of the second flange 123 close to the central hole 1211; a counterbore 1221 is provided at the top of the first flange 122, and the counterbore 1221 is provided at the top of the central hole 1211 and is coaxial with the central hole 1211.

[0063] In this embodiment, the first guiding rib 1231 is arc-shaped and is arranged on the side of the second flange 123 close to the central hole 1211. When the connecting column 134 of the connecting piece 130 is inserted into the central hole 1211, the first guiding rib 1231 provides a guiding function for the connecting column 134 to improve the assembly efficiency of the connecting column 134 and the first pole 120. A counterbore 1221 is provided on the top end surface of the first flange 122, and the counterbore 1221 is arranged at the top of the central hole 1211. The central axis of the counterbore 1221 coincides with the central axis of the central hole 1211. The counterbore 1221 is a circular counterbore 1221, and the diameter of the counterbore 1221 is larger than the diameter of the central hole 1211; the counterbore 1221 can be used as a welding area. After the connecting column 134 of the connecting piece 130 is inserted into the central hole 1211, welding is performed at the counterbore 1221 to fixedly connect the connecting column 134 and the first pole 120 together, thereby realizing the electrical connection between the connecting piece 130 and the first pole 120; the specific welding method can be laser penetration welding or ultrasonic penetration welding. The counterbore 1221 can also prevent the weld mark formed by welding from protruding from the top end surface of the first flange 122.

[0064] In other embodiments, a welding rib 1222 is provided between the counterbore 1221 and the central hole 1211. When fixedly connecting the connecting column 134 and the first pole 120 together, by means of laser penetration welding, the welding rib 1222 and the connecting column 134 on the connecting piece 130 are melted and connected, so that the connecting column 134 and the first pole 120 are electrically connected, effectively improving the welding yield and efficiency.

[0065] In one of the embodiments, a second guiding rib 1341 is provided at one end of the connecting column 134 away from the connecting piece 130.

[0066] In this embodiment, the second guiding rib 1341 is arc-shaped. By providing the second guiding rib 1341 at one end of the connecting column 134 away from the connecting piece 130, during the process of inserting the connecting column 134 into the central hole 1211, the first guiding rib 1231 and the second guiding rib 1341 cooperate with each other to more conveniently assemble the connecting column 134 of the connecting piece 130 into the central hole 1211.

[0067] In one of the embodiments, the connecting piece 130 includes a first connecting portion 131, a second connecting portion 132, and a transition connecting portion 133 connecting the first connecting portion 131 and the second connecting portion 132. The transition connecting portion 133 makes the first connecting portion 131 and the second connecting portion 132 in different planes, and the connecting column 134 is arranged on the first connecting portion 131.

[0068] In this embodiment, the second flange 123 abuts against the first connecting portion 131; the first connecting portion 131, the second connecting portion 132, the transition connecting portion 133 and the connecting column 134 are all 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 two first connecting portions 131 and the second connecting portion 132 are in different planes through the transition connecting portion 133, and the second connecting portion 132 is slightly higher than the first connecting portion 131, which can better fix the first connecting portion 131 and the second connecting portion 132 of the connecting piece 130 to the first pole 120 and the tab 310 respectively, avoiding interference between the connecting piece 130 and other components inside the battery cell, thereby improving the compactness and rationality of the internal structure of the battery cell.

[0069] In one of the embodiments, a partial width of the second connecting portion 132 of the connecting piece 130 is smaller than the width of the first connecting portion 131. When the connecting piece 130 is fixedly connected to the first pole 120, the second connecting portion 132 of the connecting piece 130 will block the second through hole 160 on the first cover plate 110. Therefore, the width of the portion of the second connecting portion 132 blocking the second through hole 160 is appropriately reduced, so that the tab 310 can extend out from the second through hole 160, facilitating the subsequent fixed connection between the tab 310 and the connecting piece 130.

[0070] In one of the embodiments, it further includes a first plastic part 140 sleeved on the first pole 120; the first plastic part 140 includes a plastic part body 142 and a first ring body 141 arranged on the outer periphery of the plastic part body 142; the first flange 122 abuts against the top of the plastic part body 142 and is arranged inside the first ring body 141; the bottom of the plastic part body 142 abuts against the first cover plate 110.

[0071] In this embodiment, the first plastic part 140 is sleeved on the first pole 120, the plastic part body 142 abuts against the top of the first cover plate 110, the first flange 122 at the top of the first pole 120 abuts against the plastic part body 142, and the first ring body 141 arranged on the outer periphery of the plastic part body 142 encloses the first flange 122 inside the first ring body 141. Through the mutual abutting and cooperation between the first flange 122 and the second flange 123 and the plastic part body 142 and the first ring body 141, the first plastic part 140 can be fixed between the first pole 120 and the first cover plate 110 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 140 can also play a buffering role, reducing the direct collision and wear between the first pole 120 and the first cover plate 110, and reducing the risk of connection loosening or damage caused by vibration. At the same time, the first plastic part 140 has good insulation performance, which can prevent accidental conductive contact between the first pole 120 and the first cover plate 110, thereby improving the electrical safety of the battery cell.

[0072] In one embodiment, it further includes a sealing ring 150 sleeved on the first pole column 120; the sealing ring 150 includes a sealing ring body 151 and a second ring body 152 at the top of the sealing ring body 151, and the second ring body 152 abuts against the plastic part main body 142, and the sealing ring body 151 abuts against the first cover plate 110, the second flange 123 and the first column 121 respectively.

[0073] In this embodiment, the sealing ring 150 is sleeved on the first pole column 120, and the second ring body 152 at the top of the sealing ring body 151 abuts and cooperates with the plastic part main body 142, so as to be able to fill the tiny gap between the first pole column 120 and the first cover plate 110, 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. Making the sealing ring body 151 abut against the first cover plate 110, the second flange 123 and the first column 121 respectively can further play a buffering role during the working process of the battery cell, reduce the direct collision and wear between the first pole column 120 and the first cover plate 110, and reduce the risk of connection loosening or damage caused by vibration.

[0074] It can be understood that a first plastic part 140 and a sealing ring 150 are also sleeved on the second pole column 220. Through the mutual abutting and cooperation between the third flange 222 and the fourth flange 223 and the plastic part main body 142, the first ring body 141, the sealing ring body 151 and the second ring body 152, the first plastic part 140 and the sealing ring 150 can be fixed between the second pole column 220 and the second cover plate 210 without adding additional connecting parts, thereby further improving the space utilization rate inside the battery cell.

[0075] In one embodiment, an explosion-proof valve 230 and a liquid injection hole 240 are further provided on the second cover plate 210, and the explosion-proof valve 230 is installed in the fourth through hole 250.

[0076] In this embodiment, by arranging the explosion-proof valve 230 in the fourth through hole 250, certain support and fixation can be provided for the explosion-proof valve 230, making the explosion-proof valve 230 more stable during the working process and reducing the risk of failure caused by loosening or displacement. Arranging the explosion-proof valve 230 and the liquid injection hole 240 on the second cover plate 210 can make the overall structure of the second cover plate 210 more compact, save the internal space of the battery cell, and thus improve the space utilization rate inside the battery cell.

[0077] In one embodiment, it further includes a sealing plate 170 installed at the second through hole 160. By installing the sealing plate 170 at the second through hole 160, targeted sealing can be performed on the second through hole 160, 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.

[0078] In other embodiments, the first pole post 120 may be installed on both the first cover plate 110 and the second cover plate 210; specifically, how to install the pole post on the first cover plate 110 and the second cover plate 210 can be selected according to actual usage requirements. When the first pole post 120 is installed on both the first cover plate 110 and the second cover plate 210, a through hole needs to be opened in the length direction of the second cover plate 210 for the pole lug 310 on the pole group 300 to pass through the through hole and be fixedly connected to the connecting piece 130.

[0079] Second, referring also to Figures 10 to 16 , the present utility model also provides an electric core, including: an electric core cover plate assembly 100; a housing 200 having a receiving cavity and two openings communicating with both ends of the receiving cavity, and the first cover plate 110 and the second cover plate 210 in the electric core cover plate assembly 100 seal the two openings; a pole group 300 disposed in the receiving cavity, one end of the pole group 300 is fixedly connected to the second cover plate 210, and a pole lug 310 is provided at the other end of the pole group 300, and the pole lug 310 is electrically connected to the connecting piece 130 of the electric core cover plate assembly 100.

[0080] In this embodiment, the housing 200 of the electric core and the electric core 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 electric core, 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 assembly. This assembly method is simple and efficient, and when it is necessary to maintain or replace internal components, the first cover plate 110 or the second cover plate 210 can be relatively conveniently opened for operation. By electrically connecting the pole lug 310 to the connecting piece 130 of the electric core cover plate assembly 100, the intermediate links and resistance of current transmission are reduced, enabling 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 electric core.

[0081] In one of the embodiments, the pole lug 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 pole lug 310 is provided with a bending portion 311, and the lower surface of the bending portion 311 is fixedly connected to the second connecting portion 132 of the connecting piece 130.

[0082] 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. The tab 310 extends away from the electrode assembly 300 from the top end surface of the electrode assembly 300 and passes through the second through hole 160; 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 132 of the connecting piece 130, increasing the contact area between the tab 310 and the second connecting portion 132 of the connecting piece 130, 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 132.

[0083] In one embodiment, the upper surface of the bent portion 311 is a second welding area, and the second welding area is provided with a plurality of embossments.

[0084] In this embodiment, the second welding area is arranged on the upper surface of the bent portion 311, so as to facilitate welding the bent portion 311 of the tab 310 to the second connecting portion 132 of the connecting piece 130 at the second through hole 160 by laser welding or ultrasonic welding and using the penetration welding method; arranging the welding area on the upper surface of the bent portion 311 facilitates welding operations and improves the accuracy and efficiency of welding. A plurality of embossments are arranged in the second welding area. When laser welding is used, the laser irradiates vertically onto the second welding area, and the embossments reflect the laser to avoid the laser light source, reducing the ability of the reflected laser, thereby improving the welding efficiency when the tab 310 and the connecting piece 130 are welded and improving the production efficiency.

[0085] In this embodiment, the battery cell includes but is not limited to a blade battery cell.

[0086] 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 elaborated herein.

[0087] 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 cell cover plate assembly, characterized in that, Comprising: A first cover plate, on which a first through hole and a second through hole are provided along the length direction of the first cover plate; A second cover plate, on which a third through hole and a fourth through hole are provided along the length direction of the second cover plate; A first pole column, arranged in the first through hole, the first pole column comprising a first column body and a first flange and a second flange provided at both ends of the first column body; A second pole column, arranged in the third through hole, the second pole column comprising a second column body and a third flange and a fourth flange provided at both ends of the second column body; A central hole is provided in the center of the first column body, and the central hole penetrates through the second flange; A connecting piece, on which a connecting column is provided, and the connecting column is matched with the central hole; the connecting piece is fixedly connected to the first pole column through the connecting column.

2. The cell cover plate assembly according to claim 1, wherein A first guiding rib is provided on one side of the second flange close to the central hole; A counterbore is provided at the top of the first flange, and the counterbore is arranged at the top of the central hole and is coaxial with the central hole.

3. The cell cover plate assembly according to claim 1, wherein A second guiding rib is provided at one end of the connecting column away from the connecting piece.

4. The cell cover plate assembly according to claim 1, wherein The connecting piece comprises 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, and the connecting column is arranged on the first connecting portion.

5. The cell cover plate assembly according to any one of claims 1 to 4, characterized in that, It further comprises a first plastic part, sleeved on the first pole column; the first plastic part comprises a plastic part main body and a first ring body arranged on the outer periphery of the plastic part main body; The first flange abuts against the top of the plastic part main body and is arranged within the first ring body; the bottom of the plastic part main body abuts against the first cover plate.

6. The cell cover plate assembly according to claim 5, wherein, It further comprises a sealing ring, sleeved on the first pole column; The sealing ring comprises a sealing ring body and a second ring body at the top of the sealing ring body, the second ring body abuts against the plastic part main body, and the sealing ring body abuts against the first cover plate, the second flange and the first column body respectively.

7. The cell cover plate assembly according to claim 1, wherein, An explosion-proof valve and a liquid injection hole are further provided on the second cover plate, and the explosion-proof valve is installed in the fourth through hole.

8. A battery cell, characterized in that, Comprising: The battery cell cover plate assembly according to any one of claims 1 to 7; A housing, which has a receiving cavity and two openings communicating with both ends of the receiving cavity, and the first cover plate and the second cover plate in the battery cell cover plate assembly seal the two openings; A pole group, arranged in the receiving cavity, one end of the pole group is fixedly connected to the second cover plate, and a pole tab is provided at the other end of the pole group, and the pole tab is electrically connected to the connecting piece of the battery cell cover plate assembly.

9. The battery cell according to claim 8, wherein, The pole tab is integrally formed with the pole group and extends away from the pole group from the top end face of the pole group, the pole 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.

10. A battery pack, characterized in that, Comprising: A plurality of battery cells according to any one of claims 8 or 9.

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