Cover plate assembly and battery monomer with same

Abstract

The utility model discloses a cover plate assembly and a battery monomer with the cover plate assembly, the cover plate assembly comprises a cover plate, upper plastic cement and a conductive terminal, the cover plate, the upper plastic cement and the conductive terminal are sequentially laminated along the thickness direction of the cover plate; the first terminal post and the second terminal post penetrate through the cover plate, the upper plastic cement and the conductive terminal in the first direction and are electrically connected with the conductive terminal, and in the thickness direction of the cover plate, the first terminal post and the second terminal post are electrically connected with the conductive terminal; a concave groove is formed in at least one of the two side surfaces, attached to the cover plate, of the upper plastic and the conductive terminal, the side surface, attached to the upper plastic, of the conductive terminal and the side surface, attached to the upper plastic, of the cover plate, and the groove is located between the first pole and the second pole. According to the cover plate assembly disclosed by the utility model, the conductive terminals can be effectively prevented from protruding and bulging, the conductive terminals are prevented from falling off, the welding connection effect of the battery monomer and the busbar is well improved, and the battery monomer has good assembling and positioning accuracy when being assembled in a module.

Description

Technical Field

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

[0002] A battery cell is generally composed of a pole group, a shell and a cover plate. The cover plate and the shell are welded to form a closed space with a certain mechanical strength. The cover plate is integrated with functional units such as conductive terminals and poles to play the role of electrical connection and positioning. When the width of the battery cell is narrow, the battery cell needs to be equipped with a bipolar pole to meet the overcurrent requirements. When the two poles are connected and fixed to the conductive terminals, the conductive terminals will swell and fall off, resulting in poor welding effect between the battery cell and the busbar, and reduced positioning accuracy when the battery cell is assembled in the module. Utility Model Content

[0003] The present invention is based on the discovery of the following facts and problems by the inventor of the present application:

[0004] When the conductive terminal is connected and fixed to the two poles, the two poles are riveted to the two ends of the conductive terminal and fixed on the cover plate, and the upper plastic is arranged between the conductive terminal and the cover plate. During riveting, the two ends of the conductive terminal are squeezed by force against the upper plastic and the cover plate, and the upper plastic and the cover plate form a reaction force on the middle position of the conductive terminal, so that when the conductive terminal is pressed toward the cover plate, the middle position of the conductive terminal is away from the cover plate to form a bulge. In actual production, due to unreasonable riveting jigs and other conditions, the riveted joints between the conductive terminal and the pole are easily failed due to the reaction force of the upper plastic and the cover plate, resulting in the falling off of the conductive terminal. The bulging of the conductive terminal makes the surface flatness of the conductive terminal used for connecting with the bus bar fail to meet the requirements, thereby affecting the welding connection effect of the battery cell and the bus bar. The bulging bulge causes deviations in the length and width dimensions of the conductive terminal, thereby affecting the assembly positioning accuracy of the battery cell in the module.

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a cover plate assembly, which can effectively prevent the conductive terminal from swelling and falling off, improve the welding connection effect between the battery cell and the bus bar, and enable the battery cell to have good positioning accuracy when assembled in the module.

[0006] The utility model also provides a battery monomer having the cover plate assembly.

[0007] According to the first aspect of the utility model, the cover plate assembly includes: a cover plate, an upper plastic and a conductive terminal, the cover plate, the upper plastic and the conductive terminal are arranged in sequence in a stacked manner along the thickness direction of the cover plate; a first pole and a second pole, the first pole and the second pole are arranged at intervals along the first direction, the first pole and the second pole both pass through the cover plate, the upper plastic and the conductive terminal and are electrically connected to the conductive terminal, wherein, in the thickness direction of the cover plate, the upper plastic and the conductive terminal are respectively formed with a concave groove on at least one of the two side surfaces bonded to the cover plate, the one side surface bonded to the conductive terminal and the upper plastic, and the one side surface bonded to the cover plate and the upper plastic, and the groove is located between the first pole and the second pole.

[0008] According to the cover plate assembly of the utility model, by setting the cover plate, the upper plastic and the conductive terminal, the upper plastic and the conductive terminal are respectively provided with a concave groove on at least one of the two side surfaces bonded to the cover plate, the one side surface bonded to the conductive terminal and the upper plastic, and the one side surface bonded to the cover plate and the upper plastic. The groove is located between the first pole and the second pole, which can effectively prevent the conductive terminal from bulging and falling off, greatly improve the welding connection effect between the battery cell and the bus bar, and enable the battery cell to have good assembly positioning accuracy when assembled in the module.

[0009] In some embodiments of the present invention, the groove extends along the first direction, and in the first direction, the depth of the groove first gradually increases and then gradually decreases.

[0010] In an embodiment of the present invention, in the first direction, the groove wall of the groove extends along an arc line.

[0011] In some embodiments of the present invention, in the first direction, the depths of the grooves are equal.

[0012] In some embodiments of the present invention, the grooves are symmetrically arranged about a perpendicular bisector of a line connecting the first pole and the second pole in the first direction.

[0013] In some embodiments of the present invention, the groove is formed on a surface of the upper plastic facing the cover plate.

[0014] In one embodiment of the present invention, in the thickness direction of the cover plate, the ratio of the maximum depth of the groove to the thickness of the upper plastic is 0.08-0.12.

[0015] In some embodiments of the present invention, two ends of the conductive terminal are provided with rivet holes, and the first pole and the second pole extend into the two rivet holes respectively to be riveted to the conductive terminal.

[0016] In some embodiments of the present invention, a mounting groove is formed on the side of the upper plastic away from the cover plate, at least a portion of the conductive terminal is disposed in the mounting groove, and the groove is formed on the upper surface of the two side walls of the upper plastic in the width direction of the mounting groove.

[0017] A battery cell according to the second aspect of the present invention comprises the cap plate assembly according to the first aspect of the present invention.

[0018] According to the battery cell of the utility model, by setting the cover plate assembly of the first aspect mentioned above, the cover plate assembly is provided with a cover plate, an upper plastic and a conductive terminal, and the upper plastic and the conductive terminal are respectively provided with a concave groove on at least one of the two side surfaces bonded to the cover plate, the one side surface bonded to the conductive terminal and the upper plastic, and the one side surface bonded to the cover plate and the upper plastic, and the groove is located between the first pole and the second pole, which can effectively prevent the conductive terminal from bulging and falling off, and greatly improve the welding connection effect between the battery cell and the bus bar, and enable the battery cell to have good assembly positioning accuracy when assembled in the module.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of a cover plate assembly according to an embodiment of the utility model;

[0021] Figure 2 is a schematic diagram of a cover plate assembly according to another angle of an embodiment of the utility model;

[0022] Figure 3 is an exploded view of a cover plate assembly according to an embodiment of the utility model;

[0023] Figure 4 is a cross-sectional view of a cover plate assembly according to an embodiment of the utility model;

[0024] Figure 5 It is a cross-sectional view of the upper plastic according to an embodiment of the utility model.

[0025] Reference numerals:

[0026] 10. Conductive terminal; 11. Riveting hole; 12. Mounting boss;

[0027] 20. Apply plastic; 21. Install groove; 22. Groove;

[0028] 30. Cover plate; 31. Perforation;

[0029] 40, lower plastic; 50, sealing member; 60, first pole; 70, second pole; 80, electrical connection plate;

[0030] 100. Cover plate assembly. DETAILED DESCRIPTION

[0031] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] First, refer to Figure 1-Figure 5 A battery cell according to an embodiment of the second aspect of the utility model is briefly described. The battery cell includes a shell and a cover assembly 100. The cover assembly 100 cooperates with the shell to form a closed space for accommodating the electrode group. The cover assembly 100 is used for welding connection between the battery cell and the bus bar.

[0033] Reference below Figure 1-Figure 5 A cover plate assembly 100 according to an embodiment of the first aspect of the present invention is described.

[0034] like Figure 3 As shown, the cover plate assembly 100 according to the first embodiment of the utility model includes: a cover plate 30 , an upper plastic 20 , a conductive terminal 10 , a first pole 60 and a second pole 70 .

[0035] Specifically, the cover plate 30, the upper plastic 20 and the conductive terminal 10 are arranged along the thickness direction of the cover plate 30 (eg Figure 2 The first pole 60 and the second pole 70 are arranged in a first direction (as shown in the upper and lower directions) in sequence; Figure 2 The first pole 60 and the second pole 70 both pass through the cover plate 30, the upper plastic 20 and the conductive terminal 10 and are electrically connected to the conductive terminal 10, wherein, in the thickness direction of the cover plate 30, the upper plastic 20 and the conductive terminal 10 are respectively provided with a concave groove 22 on at least one of the two side surfaces of the upper plastic 20 and the conductive terminal 10 that are bonded to the cover plate 30, the one side surface of the conductive terminal 10 and the upper plastic 20, and the one side surface of the cover plate 30 and the upper plastic 10, and the groove 22 is located between the first pole 60 and the second pole 70.

[0036] In this embodiment, the groove 22 is formed on at least one of the two side surfaces of the upper plastic 20 that are bonded to the conductive terminal and the cover plate, the side surface of the conductive terminal 10 that is bonded to the upper plastic 20, and the side surface of the cover plate 30 that is bonded to the upper plastic 20. For example, the groove 22 can be formed on the side surface of the upper plastic 20 that faces the conductive terminal 10, the side surface of the upper plastic 20 that faces the cover plate 30, the side surface of the conductive terminal 10 that faces the upper plastic 20, and the primary surface of the cover plate 30 that faces the upper plastic 20. The groove 22 can also be formed on the two side surfaces of the upper plastic 20, or on the side surface of the upper plastic 20 that faces the conductive terminal 10 and the side surface of the conductive terminal 10 that faces the upper plastic 20, or on the side surface of the conductive terminal 10 that faces the upper plastic 20 and the primary surface of the cover plate 30 that faces the upper plastic 20, and so on. One or more grooves 22 can be formed.

[0037] In this embodiment, the first pole 60 and the second pole 70 are electrically connected to the conductive terminal 10, which can well meet the overcurrent requirements of the battery cell during charging and discharging. The groove 22 is formed between the first pole 60 and the second pole 70. When the first pole 60 and the second pole 70 are connected and fixed to the conductive terminal 10, the conductive terminal 10 is pressed against the upper plastic 20 and the cover plate 30 at the portion connected to the first pole 60 and the second pole 70, and the conductive terminal 10 is pressed toward the upper plastic 20 along the thickness direction of the cover plate 30.

[0038] When the conductive terminal 10 is pressed toward the upper plastic 20 along the thickness direction of the cover plate 30, the portion where the conductive terminal 10 is connected to the first pole 60 and the second pole 70 can well overcome the reaction force of the upper plastic 20 and the cover plate 30 and be pressed toward the upper plastic 20. Since a concave groove 22 is formed on at least one of the two side surfaces where the upper plastic 20 is bonded to the conductive terminal and the cover plate, the one side surface where the conductive terminal 10 is bonded to the upper plastic 20, and the one side surface where the cover plate 30 is bonded to the upper plastic 20, and the groove 22 is formed between the first pole 60 and the second pole 70, there is a gap between the conductive terminal 10 and the upper plastic 20 or there is a gap between the upper plastic 20 and the cover plate 30.

[0039] When the portion between the first pole 60 and the second pole 70 of the conductive terminal 10 is pressed toward the upper plastic 20, since there is a gap in the thickness direction between the bonding portion of the conductive terminal 10 and the upper plastic 20 or there is a gap in the thickness direction between the bonding portion of the upper plastic 20 and the cover plate 30, the upper plastic 20 has a small reaction force on the conductive terminal 10 or the cover plate 30 has a small reaction force on the conductive terminal 10 and the upper plastic 20, so that the portion between the conductive terminal 10 and the first pole 60 and the second pole 70 can follow the conductive terminal 10 in the bonding portion with the first pole 60. The connecting portion of the column 60 and the second pole 70 is stably pressed toward the upper plastic 20 and the cover plate 30, so that the conductive terminal 10 can be effectively prevented from bulging during the process of being connected and fixed to the first pole 60 and the second pole 70, thereby effectively preventing the conductive terminal 10 from falling off, and making the surface of the conductive terminal 10 facing away from the upper plastic 20 have good flatness to facilitate welding connection with the bus, so that the battery cell and the bus have a good welding connection effect, and the battery cell can have good positioning accuracy when assembled in the module.

[0040] In this embodiment, there is a gap between the conductive terminal 10 and the upper plastic 20 or a gap between the upper plastic 20 and the cover plate 30, which can reduce the squeezing force on the upper plastic 20 from the cover plate 30 and the conductive terminal 10, thereby greatly reducing the probability of cracking of the upper plastic 20, so that the upper plastic 20 can play a good insulating role for the conductive terminal 10 and the cover plate 30.

[0041] According to the cover assembly 100 of the embodiment of the utility model, by setting the cover 30, the upper plastic 20 and the conductive terminal 10, the upper plastic 20 and the conductive terminal 10 are respectively provided with a concave groove 22 on at least one of the two side surfaces bonded to the cover 30, the one side surface bonded to the conductive terminal 10 and the upper plastic 20, and the one side surface bonded to the cover 30 and the upper plastic 10. The groove 22 is located between the first pole 60 and the second pole 70, which can effectively prevent the conductive terminal 10 from bulging and falling off, and greatly improve the welding connection effect between the battery cell and the bus bar, and enable the battery cell to have good assembly positioning accuracy when assembled in the module.

[0042] In some embodiments of the present invention, reference Figure 5 As shown, the groove 22 may extend along a first direction, and in the first direction, the depth of the groove 22 first gradually increases and then gradually decreases.

[0043] It can be understood that when the upper plastic 20 is connected and fixed with the conductive terminal 10 and the first pole 60 and the second pole 70, the upper plastic 20 will undergo a certain compression deformation under the extrusion of the conductive terminal 10 and the cover plate 30. The greater the extrusion force, the greater the deformation of the upper plastic 20. Since the connection and fixing force applied to the conductive terminal 10 gradually decreases from the position with the first pole 60 and the second pole 70 to the middle position in the first direction, the deformation of the upper plastic 20 gradually decreases. In this embodiment, the depth of the groove 22 first gradually increases and then gradually decreases in the first direction, which can well match the dimensional change of the upper plastic 20 after the extrusion deformation, thereby well reducing the reaction force of the upper plastic 20 on the conductive terminal 10 when it is fixed with the cover plate 30, thereby well avoiding the convex expansion of the conductive terminal 10, and allowing the upper plastic 20, the cover plate 30 and the conductive terminal 10 to form a good abutment surface in the first direction, so that the overall structure of the cover plate assembly 100 is stable and compact.

[0044] In one embodiment of the present invention, reference Figure 5 As shown, in the first direction, the groove wall of the groove 22 can extend along an arc line.

[0045] In this way, when the conductive terminal 10 is connected and fixed to the first pole 60 and the second pole 70, the upper plastic 20 can fit well with the conductive terminal 10 and the cover plate 30 under the extrusion of the conductive terminal 10 and the cover plate 30. Specifically, when a groove 22 is formed on the conductive terminal 10 or the cover plate 30, the upper plastic 20 can well fill the groove 22 extending along the arc line under the extrusion and clamping of the conductive terminal 10 and the cover plate 30. When the groove 22 is formed on the upper plastic 20, the upper plastic 20 can be deformed along the thickness direction of the cover plate 30 under the extrusion and clamping of the conductive terminal 10 and the cover plate 30 so that the depth of the groove 22 is reduced or even disappears, thereby fitting with the cover plate 30 and the conductive terminal 10.

[0046] In some embodiments of the present invention, reference Figure 5 As shown, in the first direction, the depths of the grooves 22 may be equal.

[0047] In this embodiment, the depth of the groove 22 in the first direction is set to be the same, so that the processing of the groove 22 is more convenient, and the groove 22 can be easily and simply formed on the conductive terminal 10, the cover plate 30 or the upper plastic 20.

[0048] In some embodiments of the present invention, reference Figure 5 As shown, the grooves 22 may be symmetrically arranged with respect to a perpendicular midline of a line connecting the first pole 60 and the second pole 70 in the first direction.

[0049] In this way, the groove 22 can better cooperate with the fluctuation of the upper plastic 20 in the thickness direction when the conductive terminal 10 is connected and fixed to the first pole 60 and the second pole 70, so that the reaction force of the upper plastic 20 and the cover plate 30 on the position of the conductive terminal 10 between the first pole 60 and the second pole 70 can be stably reduced, so that the conductive terminal 10 can be stably and reliably fixed to the first pole 60 and the second pole 70.

[0050] In some embodiments of the present invention, Figure 1 and Figure 5 As shown, the groove 22 may be formed on a surface of the upper plastic 20 facing the cover plate 30 .

[0051] In this embodiment, the groove 22 is formed on the side surface of the upper plastic 20 facing the cover plate 30. When the conductive terminal 10 is connected and fixed with the first pole 60 and the second pole 70, when the upper plastic 20 is deformed toward the groove 22 under the extrusion of the conductive terminal 10 and the cover plate 30, the conductive terminal 10 can always be in contact with the side surface of the upper plastic 20 facing the conductive terminal 10, so that the connection and fixation of the conductive terminal 10 with the upper plastic 20 and the cover plate 30 can be more stably made, and to a certain extent, the influence of the deformation of the upper plastic 20 on the relative position of the conductive terminal 10 and the cover plate 30 when being fastened can be reduced, so that the conductive terminal 10 can be assembled and positioned more accurately, and thus the cover plate assembly 100 can have better assembly positioning accuracy in the module.

[0052] In one embodiment of the present invention, reference Figure 5 As shown, in the thickness direction of the cover plate 30 , the ratio of the maximum depth of the groove 22 to the thickness of the upper plastic 20 may be 0.08-0.12.

[0053] In this embodiment, the ratio of the maximum depth of the groove 22 to the thickness of the upper plastic 20 is limited to between 0.08 and 0.12, so that sufficient space of the groove 22 can be reserved between the conductive terminal 10 and the upper plastic 20 or between the upper plastic 20 and the cover plate 30, so that the conductive terminal 10 can be stably connected to the first pole 60 and the second pole 70, and the bulging of the conductive terminal 10 can be well avoided, and the upper plastic 20 can have a sufficient thickness to play a good insulation role. For example, the ratio of the maximum depth of the groove 22 to the thickness of the upper plastic 20 can be 0.08, 0.09, 0.1, 0.11, 0.12, etc.

[0054] In some examples of the present invention, reference Figure 5 As shown, in the thickness direction of the cover plate 30 , the maximum depth of the groove 22 may be 0.2 mm to 0.3 mm.

[0055] This can effectively prevent the conductive terminal 10 from swelling and falling off, and the upper plastic 20 can provide a stable and good insulation isolation between the conductive terminal 10 and the cover 30. Figure 5 As shown in the figure, h represents the maximum depth of the groove 22, and the maximum depth h of the groove 22 can be 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, etc.

[0056] In some embodiments of the present invention, Figure 3 As shown, two ends of the conductive terminal 10 may be provided with riveting holes 11 , and the first pole 60 and the second pole 70 extend into the two riveting holes 11 respectively and are riveted to the conductive terminal 10 .

[0057] In this embodiment, the two ends of the conductive terminal 10 refer to the two ends of the conductive terminal 10 in the first direction. In this embodiment, rivet holes 11 are set at the two ends of the conductive terminal 10 to be riveted to the first pole 60 and the second pole 70. The structure is simple, so that the conductive terminal 10 is connected and fixed to the first pole 60 and the second pole 70 more conveniently and reliably.

[0058] In some embodiments of the present invention, Figure 3-Figure 5 As shown, a mounting groove 21 may be formed on one side of the upper plastic 20 away from the cover plate 30 , at least a portion of the conductive terminal 10 is disposed in the mounting groove 21 , and a groove 22 is formed on the upper surface of two side walls of the upper plastic 20 in the width direction of the mounting groove 21 .

[0059] The two side walls here refer to the upper surfaces of the two side plates of the upper plastic 20 that cooperate to form the mounting groove 21 in the width direction. The groove 22 is formed on the upper plastic 20, which can reduce the slotting of the conductive terminal 10 and the cover plate 30, making the processing of the conductive terminal 10 and the cover plate 30 more convenient, and making the groove 22 more convenient to process and shape. In this embodiment, the mounting groove 21 is provided, so that the positioning of the conductive terminal 10 and the upper plastic 20 during fixed assembly is more convenient, and the upper plastic 20 can more reliably insulate and separate the conductive terminal 10 and the cover plate 30, so that the cover plate assembly 100 is more convenient to assemble and more stable and reliable to use.

[0060] Furthermore, if Figure 3 As shown, a mounting boss 12 may be formed on the surface of the conductive terminal 10 facing the upper plastic 20 , and the mounting boss 12 is fixed in the mounting groove 21 , so that the mounting, fixing and positioning of the conductive terminal 10 and the upper plastic 20 can be more convenient and easy.

[0061] In some embodiments of the present invention, Figure 3As shown in FIG. 4 , the cover plate assembly 100 may further include an electrical connection plate 80 . The electrical connection plate 80 is connected to an end of the pole away from the conductive terminal 10 . The electrical connection plate 80 is arranged in parallel with the cover plate 30 .

[0062] In this embodiment, an electrical connection plate 80 is connected to one end of the pole, and the electrical connection plate 80 can be conveniently connected to the pole group in the battery cell. Specifically, the electrical connection plate 80 is connected to the plurality of pole tabs in the pole group and then electrically connected to the pole and the conductive terminal 10, thereby leading the current inside the battery cell out of the battery cell. The electrical connection plate 80 is arranged in parallel with the cover plate 30, so that the electrical connection plate 80 and the cover plate 30 can be arranged more conveniently and easily when assembled.

[0063] In some embodiments of the present invention, Figure 2 As shown, the cover assembly 100 may further include a lower plastic 40 , and the lower plastic 40 is disposed between the cover 30 and the electrical connection plate 80 .

[0064] The lower plastic 40 can provide insulation protection for the cover plate 30 and the electrical connection plate 80 , thereby improving the safety of the battery cells and allowing the battery cells to operate stably and reliably.

[0065] In some embodiments of the present invention, Figure 3 and Figure 4 As shown, the cover plate assembly 100 may further include a seal 50, which is sleeved on the first pole 60 and the second pole 70, and the cover plate 30 is provided with a through hole 31, and the first pole 60 and the second pole 70 pass through the through hole 31 and are riveted to the conductive terminal 10, and the seal 50 is arranged between the conductive terminal 10 and the electrical connection plate 80. In this way, when the first pole 60 and the second pole 70 pass through the cover plate 30 and are riveted to the conductive terminal 10, a good sealing effect can be played at the through hole 31, so that the internal space of the battery cell has good sealing, so that the battery cell can operate stably. Preferably, the seal 50 is a sealing sleeve.

[0066] Reference below Figure 1-Figure 5 A battery cell according to an embodiment of the second aspect of the utility model is described.

[0067] like Figure 1-Figure 5 As shown, the battery cell according to an embodiment of the present invention includes the cap plate assembly 100 according to the first embodiment of the present invention.

[0068] Other structures and operations of the battery cell according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0069] According to the battery cell of the embodiment of the utility model, by setting the cover plate assembly 100 of the above-mentioned first embodiment, the cover plate assembly 100 is provided with a cover plate 30, an upper plastic 20 and a conductive terminal 10, and the upper plastic 20 and the conductive terminal 10 are respectively provided with a concave groove 22 on at least one of the two side surfaces bonded to the cover plate 30, the one side surface bonded to the conductive terminal 10 and the upper plastic 20, and the one side surface bonded to the cover plate 30 and the upper plastic 10. The groove 22 is located between the first pole 60 and the second pole 70, which can effectively prevent the conductive terminal 10 from bulging and falling off, and greatly improve the welding connection effect between the battery cell and the bus bar, and enable the battery cell to have good assembly positioning accuracy when assembled in the module.

[0070] The following will refer to Figure 1-Figure 5 A battery cell according to a specific embodiment of the present invention is described.

[0071] like Figure 1-Figure 5 As shown, the battery cell includes a cover plate assembly 100, which includes a conductive terminal 10, an upper plastic 20, a cover plate 30, a lower plastic 40, a first pole 60, a second pole 70, an electrical connector and a seal 50. The conductive terminal 10 is provided with rivet holes 11 at both ends of the first direction, the conductive terminal 10 is arranged on one side of the thickness direction of the cover plate 30, the upper plastic 20 is arranged between the conductive terminal 10 and the cover plate 30, the upper plastic 20 is provided with a mounting groove 21, the conductive terminal 10 is provided with a mounting boss 12, and the mounting boss 12 is assembled in the mounting groove 21, and the upper plastic 20 is provided with an arc-shaped groove 22 on the side wall structure on both sides of the mounting groove 21 in the width direction, and the side of the side wall structure facing the conductive terminal 10; the cover plate 30 is provided with an explosion-proof valve and a through hole 31, and the explosion-proof valve and the conductive terminal 10 are arranged at intervals in the first direction of the cover plate 30.

[0072] The lower plastic 40 is arranged on the other side of the cover plate 30, and the first pole 60 and the second pole 70 are sequentially penetrated from one side of the cover plate 30 along the thickness direction of the cover plate 30 through the lower plastic 40, the cover plate 30, the upper plastic 20 and the conductive terminal 10, two electrical connectors are provided and are respectively connected to one end of the first pole 60 and the second pole 70, and the electrical connector is an integral part of the first pole 60 and the second pole 70; two sealing sleeves are provided and are respectively sleeved on the first pole 60 and the second pole 70; the sealing member 50 is a sealing sleeve, the upper plastic 20, the lower plastic 40 and the sealing sleeve are all processed by injection molding, the upper plastic 20 and the lower plastic 40 can be made of polyphenylene sulfide or polypropylene, the sealing sleeve can be made of fluororubber, and the conductive terminal 10 and the cover plate 30 can be made of aluminum; there are two electrical connectors, the electrical connector is an integral part of the first pole 60, and the electrical connector is an integral part of the second pole 70.

[0073] When the cover assembly 100 is assembled and fixed, the sealing sleeve is sleeved on the first pole 60 and the second pole 70. The first pole 60 and the second pole 70 penetrate the lower plastic 40 along the thickness direction of the cover 30 and pass through the through hole 31 of the cover 30 so as to pass out from the other side of the cover 30. The sealing sleeve is located between the through hole 31 and the first pole 60 and between the through hole 31 and the second pole 70. The first pole 60 and the second pole 70 continue to penetrate the upper plastic 20 and pass out from the riveting hole 11 of the conductive terminal 10. The first pole 60 and the second pole 70 are respectively connected to the conductive terminal 10 by riveting, so that the conductive terminal 10 is tightly connected to the upper plastic 20, the lower plastic 40 of the cover 30 and the sealing sleeve.

[0074] According to the cover assembly 100 of the embodiment of the utility model, by setting the cover 30, the upper plastic 20 and the conductive terminal 10, the upper plastic 20 and the conductive terminal 10 are respectively provided with a concave groove 22 on at least one of the two side surfaces bonded to the cover 30, the one side surface bonded to the conductive terminal 10 and the upper plastic 20, and the one side surface bonded to the cover 30 and the upper plastic 10. The groove 22 is located between the first pole 60 and the second pole 70, which can effectively prevent the conductive terminal 10 from bulging and falling off, and greatly improve the welding connection effect between the battery cell and the bus bar, and enable the battery cell to have good assembly positioning accuracy when assembled in the module.

[0075] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0079] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, an upper plastic and a conductive terminal, wherein the cover plate, the upper plastic and the conductive terminal are sequentially stacked along a thickness direction of the cover plate; A first pole and a second pole, the first pole and the second pole are arranged at intervals along a first direction, the first pole and the second pole both pass through the cover plate, the upper plastic and the conductive terminal and are electrically connected to the conductive terminal, Wherein, in the thickness direction of the cover plate, the upper plastic and the conductive terminal are respectively provided with a concave groove on at least one of the two side surfaces bonded to the cover plate, the one side surface bonded to the conductive terminal and the upper plastic, and the one side surface bonded to the cover plate and the upper plastic, and the groove is located between the first pole and the second pole.

2. The cover plate assembly according to claim 1, characterized in that: The groove extends along the first direction, and in the first direction, the depth of the groove gradually increases and then gradually decreases.

3. The cover plate assembly according to claim 2, characterized in that: In the first direction, the groove wall of the groove extends along an arc line.

4. The cover plate assembly according to claim 1, characterized in that: In the first direction, the depths of the grooves are equal.

5. The cover plate assembly according to claim 1, characterized in that: The grooves are arranged symmetrically about a perpendicular bisector of a line connecting the first pole and the second pole in the first direction.

6. The cover plate assembly according to any one of claims 1 to 5, characterized in that: The groove is formed on a surface of the upper plastic facing the cover plate.

7. The cover plate assembly according to claim 6, characterized in that: In the thickness direction of the cover plate, the ratio of the maximum depth of the groove to the thickness of the upper plastic is 0.08-0.

12.

8. The cover plate assembly according to claim 1, characterized in that: Riveting holes are provided at both ends of the conductive terminal, and the first pole and the second pole extend into the two riveting holes respectively and are riveted to the conductive terminal.

9. The cover plate assembly according to claim 1, characterized in that: A mounting groove is formed on one side of the upper plastic away from the cover plate, at least part of the conductive terminal is arranged in the mounting groove, and the groove is formed on the upper surface of two side walls of the upper plastic in the width direction of the mounting groove.

10. A battery cell, characterized in that: Comprising a cover plate assembly according to any one of claims 1-9.

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