Top cover assembly and manufacturing method thereof

Abstract

The invention provides a top cover assembly and a manufacturing method thereof, the top cover assembly is used for connecting a tab in a battery cell, and the top cover assembly comprises a top cover, a welding piece, a pole and an upper plastic piece; the welding piece comprises a bearing part, a first limiting section and a second limiting section, and the pole comprises a main body and a lug boss; the upper plastic part comprises a first section, a second section, a third section and a fourth section which are sequentially connected. The upper plastic part comprises the first section, the second section, the third section and the fourth section which are connected in sequence, the first section and the third section are clamped between the first limiting sections in the welding part, relative fixation between the upper plastic part and the welding part is achieved, and the third section and the bearing part in the welding part are used for clamping the protruding part in the pole, so that the welding quality of the pole is improved. Relative fixation between the pole and the upper plastic part as well as between the pole and the welding part is realized, so that the stability of connection of all parts between the top cover assembly is ensured, and the safety of a battery cell is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a top cover assembly and a manufacturing method thereof. Background Art

[0002] Secondary batteries are mainly used in energy storage batteries and power batteries in the new energy industry. With the development of the new energy industry, the requirements for batteries are constantly increasing. As the core component of the battery, the safety and sealing performance of the battery cover are becoming more and more important.

[0003] In the top cover assembly process, the battery top cover can be assembled by injection molding, and the plastic parts formed by injection molding can achieve insulation and relative fixation between the welding ring and the pole. However, in the top cover assembly provided by the related art, the connection between the components is not tight enough, and it is easy to loosen or even fall off, affecting the normal use of the battery cell and posing a major safety hazard. Summary of the invention

[0004] An embodiment of the present invention provides a top cover assembly, which can improve the technical problem of loose connection between top cover assemblies in the related art.

[0005] In a first aspect, an embodiment of the present invention provides a top cover assembly for connecting a tab in a battery cell, the top cover assembly comprising:

[0006] A top cover, wherein a first through hole is provided on the top cover;

[0007] A welding member, at least a portion of which is disposed in the first through hole, the welding member comprising a bearing portion, a first limiting segment and a second limiting segment, and along the axial direction of the first through hole, the first limiting segment and the bearing portion are disposed at two ends of the second limiting segment and extend toward the first through hole;

[0008] A pole, the pole is spaced apart from the welding piece, the pole comprises a main body and a raised portion, the raised portion is convexly arranged on the peripheral side surface of the main body;

[0009] The upper plastic part includes a first section, a second section, a third section and a fourth section connected in sequence, the second section is clamped between the first limiting section and the main body, the first section and the third section are respectively connected to the two ends of the second section along the axial direction of the first through hole and extend in a direction away from the pole, the first limiting section is at least partially clamped between the first section and the third section, and the fourth section is clamped between the second limiting section and the protrusion.

[0010] In one embodiment, the upper plastic part further includes a fifth section, the fifth section is connected to an end of the fourth section away from the third section, and the fifth section is clamped between the protruding portion and the bearing portion.

[0011] In one embodiment, the top cover assembly further includes a seal, at least a portion of which is connected to the upper surface of the bearing portion, so that the seal can be installed on the bearing portion, and the pole is connected to the seal.

[0012] In one embodiment, a second through hole is provided on the bearing portion, and the sealing member comprises:

[0013] A mounting section, the mounting section being clamped between the pole and the bearing portion;

[0014] A connecting section is connected to one end of the mounting section close to the second through hole and extends toward the second through hole along the axial direction of the second through hole, and the connecting section abuts against a side wall of the second through hole.

[0015] In one embodiment, the welding component further includes a third limiting segment, which is arranged on a side of the second limiting segment away from the bearing portion, and one end of the third limiting segment away from the second limiting segment is connected to the top cover.

[0016] In one embodiment, the second limiting section includes a first surface facing away from the pole, the third limiting section is connected to the side wall of the first through hole, and the first surface is spaced apart from the side wall of the first through hole;

[0017] The upper plastic part further includes a sixth section, which is connected to an end of the first section away from the second section and extends along the first surface so that the sixth section is at least partially clamped between the side wall of the first through hole and the first surface.

[0018] In one embodiment, a connecting groove is formed on the top cover, the opening of the connecting groove faces the side wall of the first through hole, and part of the third limiting section is accommodated in the connecting groove.

[0019] In one embodiment, along the axial direction of the first through hole, a ratio of a size of the third limiting segment to a size of the top cover is between 0.2 and 0.5.

[0020] In one embodiment, there are at least two first limiting segments and at least two second limiting segments, and the at least two second limiting segments are arranged opposite to each other, so that the bearing portion, the first limiting segment and the second limiting segment form an opening, and the pole can be inserted between the second limiting segments from the opening.

[0021] In one embodiment, a positioning hole is formed on the upper surface of the pole, and the positioning hole is strip-shaped.

[0022] In a second aspect, an embodiment of the present invention provides a method for manufacturing a top cover assembly, comprising:

[0023] A sealing member, a top cover, a welding member and a pole are obtained; wherein the top cover is provided with a first through hole; the welding member comprises a bearing portion, a first limiting segment and a second limiting segment, wherein the first limiting segment and the bearing portion are provided at both ends of the second limiting segment and extend toward the middle of the welding member; the pole comprises a main body and a raised portion, wherein the raised portion is provided on the peripheral side surface of the main body;

[0024] Install the seal on the bearing portion of the welded component, and place the pole on the seal, so that the main body is spaced apart from the first limiting segment, the raised portion is spaced apart from the first limiting segment, and the raised portion is spaced apart from the second limiting segment;

[0025] Injection molding is performed along the side wall of the main body of the pole, and the fluid material is allowed to flow sequentially between the main body and the first limiting section, between the main body and the first limiting section, and between the protruding portion and the second limiting section to form an upper plastic part;

[0026] The upper plastic part, the welding part, the sealing part and the pole are locked with each other to form a connecting terminal;

[0027] The welding piece in the connecting terminal is sealed and welded with the top cover.

[0028] In one embodiment, the top cover is provided with a first through hole, the welding member includes a bearing portion, a first limiting segment and a second limiting segment, the first limiting segment and the second limiting segment each have at least two, and at least two second limiting segments are arranged opposite to each other, so that the bearing portion, the first limiting segment and the second limiting segment form an opening, and placing the pole on the sealing member includes:

[0029] Inserting the pole from the opening into the interval-arranged second limiting sections;

[0030] The position of the pole is adjusted so that the pole lug can be connected to the pole through the first through hole.

[0031] In one embodiment, a positioning hole is provided on the upper surface of the pole, and the positioning hole is strip-shaped, and placing the pole on the sealing member further comprises:

[0032] The pole is rotated so that the angle between the positioning hole and the welding piece is a preset angle.

[0033] Beneficial effects of the embodiments of the present invention:

[0034] The present invention realizes relative fixation between the upper plastic part and the welding part by arranging the upper plastic part into the first section, the second section, the third section and the fourth section which are connected in sequence, and clamping the first limiting section in the welding part by the first section and the third section, and realizes relative fixation between the pole and the upper plastic part and the welding part by clamping the protrusion in the pole by the third section and the bearing part in the welding part, thereby ensuring the stability of the connection between the various components between the top cover assembly, thereby improving the safety of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 is a schematic structural diagram of a top cover assembly provided by an embodiment of the present invention;

[0037] Figure 2 is an exploded view of a top cover assembly provided by an embodiment of the present invention;

[0038] Figure 3 is a cross-sectional view of a top cover assembly provided by an embodiment of the present invention;

[0039] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0040] Figure 5 is a schematic structural diagram of a weldment provided by an embodiment of the present invention;

[0041] Figure 6 is a cross-sectional view of a weldment provided by an embodiment of the present invention;

[0042] Figure 7 is a schematic structural diagram of a top cover provided by an embodiment of the present invention;

[0043] Figure 8 is a flow chart of a method for manufacturing a top cover assembly provided by an embodiment of the present invention;

[0044] Fig. 9 is a flow chart of a method for manufacturing a top cover assembly provided by an embodiment of the present invention;

[0045] Fig.10 It is a flow chart of a method for manufacturing a top cover assembly provided by an embodiment of the present invention.

[0046] The numbers in the figure are:

[0047] 1. Top cover assembly;

[0048] 11. top cover; 111. first through hole; 112. connecting groove; 1121. notch;

[0049] 12. welding part; 121. bearing part; 122. first limiting section; 123. second limiting section; 1231. first surface; 124. third limiting section; 125. opening;

[0050] 13. Pole; 131. Main body; 132. Protrusion; 133. Positioning hole;

[0051] 14, upper plastic part; 141, first section; 142, second section; 143, third section; 144, fourth section; 145, fifth section; 146, sixth section;

[0052] 15. Sealing element; 151. Mounting section; 152. Connecting section;

[0053] H1, radial direction of the first through hole;

[0054] H2. Axial direction of the first through hole. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0056] A power battery generally includes a battery cell, a battery casing that contains the battery cell, a battery top cover that is sealed and mounted on the battery casing, and an electrolyte that is poured into the battery casing. When the battery casing is sealed with the battery top cover, the positive and negative pole ears of the battery cell must first be connected to the bottom end of the pole extending into the inner side of the top cover, so that after the battery top cover seals the battery casing, the exposed top end of the pole is connected to the external circuit to realize the extraction of the positive and negative poles of the battery cell. However, the inventor of the present invention has found that during the use of the power battery provided by the related art, the connection between the various components in the top cover assembly is relatively loose, resulting in some parts being easily displaced or even falling off in the event of a collision or fall, resulting in a disconnection or short circuit.

[0057] Based on this, refer to Figures 1 to 5 In a first aspect, the present invention provides a top cover assembly 1 for connecting a battery cell. The top cover assembly 1 includes a top cover 11, a welding piece 12, a pole 13 and an upper plastic piece 14. The top cover 11 is provided with a first through hole 111; the welding piece 12, at least part of which is arranged in the first through hole 111, and the welding piece 12 includes a bearing portion 121, a first limiting segment 122 and a second limiting segment 123. Along the axial direction H2 of the first through hole, the first limiting segment 122 and the bearing portion 121 are arranged at both ends of the second limiting segment 123 and extend toward the first through hole 111; the pole 13, which is arranged at a distance from the welding piece 12, and the pole 13 includes a main The upper plastic part 14 comprises a first section 141, a second section 142, a third section 143 and a fourth section 144 which are connected in sequence, the second section 142 is clamped between the first limiting section 122 and the main body 131, the first section 141 and the third section 143 are respectively connected to the two ends of the second section 142 along the axial direction H2 of the first through hole and extend in a direction away from the pole 13, the first limiting section 122 is at least partially clamped between the first section 141 and the third section 143, and the fourth section 144 is clamped between the second limiting section 123 and the protruding portion 132.

[0058] The welding piece 12 is fixed on the top cover 11. The upper plastic piece 14 includes a first section 141, a second section 142, a third section 143 and a fourth section 144 connected in sequence, the first section 141 and the third section 143 extend in a direction away from the pole 13, thereby clamping the first limiting section 122 of the welding piece 12 in the middle, so that the position of the upper plastic piece 14 in the axial direction H2 of the first through hole is fixed by the welding piece 12; the main body 131 of the pole 13 and the first limiting section 122 of the welding piece 12 clamp the second section 142 in the middle, and the protrusion 132 of the pole 13 and the second limiting section 123 clamp the fourth section 144 in the middle, so that the position of the upper plastic piece 14 in the radial direction H1 of the first through hole is fixed by the welding piece 12, so that the upper plastic piece 14 is fixed on the welding piece 12. At the same time, the protruding portion 132 of the pole 13 is clamped in the middle by the third section 143 and the bearing portion 121 of the welding part 12, so that the position of the pole 13 on the axial direction H2 of the first through hole is fixed, and then the pole 13 is fixed on the welding part 12, that is, the welding part 12, the upper plastic part 14 and the pole 13 are all stably connected to the top cover 11, so that even if the battery cell vibrates during production and use, the components in the top cover assembly 1 are still firmly connected together, thereby improving the connection reliability between the components in the top cover assembly 1.

[0059] The second section 142 also serves to isolate the pole 13 and the first limiting section 122, thereby preventing the pole 13 and the first limiting section 122 from direct contact and avoiding possible short circuits; moreover, the second section 142 can play a buffering role to a certain extent. When the top cover assembly 1 is subjected to external vibration or impact, the second section 142 can prevent the damage caused by mutual friction and collision of the components in the top cover assembly 1. The third section 143 and the fourth section 144 further extend to the gap between the pole 13 and the welding part 12, reducing the possibility of dust, moisture and other impurities in the external environment entering the battery cell through the gap, effectively extending the service life of the battery cell, and improving the safety and performance stability of the battery.

[0060] Among them, the first through hole 111 and the pole 13 are arranged correspondingly, so that the pole 13 can be connected to the connecting piece, the pole ear and other structures inside the battery cell through the first through hole 111 to realize the conduction of the circuit. The welding part 12 includes a first limiting section 122, a second limiting section 123 and a bearing part 121 that are connected to each other. The bearing part 121 can be connected to the top cover 11 by welding, bonding, clamping, etc., and the bearing part 121 can be connected to the outer surface of the top cover 11. The bearing part 121 can also be connected to the inner wall of the first through hole 111. The embodiment of the present invention does not limit this. The first limiting section 122 and the second limiting section 123 can be made by an integral molding method, or the first limiting section 122 and the second limiting section 123 can be made separately, and connected to form the welding part 12 by subsequent welding, bonding, etc.; the second limiting section 123 is usually connected by welding, bonding or clamping. The first limiting section 122 and the bearing portion 121 extend toward the first through hole 111 , that is, toward the interior of the welding component 12 , so that the first limiting section 122 , the second limiting section 123 and the bearing portion 121 enclose a groove body, and the groove body has an opening 125 facing the interior of the welding component 12 .

[0061] The pole 13 is made of metal material, usually copper, aluminum, nickel and other materials with good conductivity. The pole 13 includes a main body 131 and a protrusion 132, and the pole 13 is spaced from the welding part 12 so that a tortuous gap is formed between the pole 13 and the welding part 12, which is convenient for forming the upper plastic part 14 in the subsequent injection molding process.

[0062] The present invention realizes relative fixation between the upper plastic part 14 and the welding part 12 by setting the upper plastic part 14 as a first section 141, a second section 142, a third section 143 and a fourth section 144 which are connected in sequence, and clamps the first limiting section 122 in the welding part 12 by the first section 141 and the third section 143, and clamps the protrusion 132 in the pole 13 by the third section 143 and the bearing portion 121 in the welding part 12, thereby realizing relative fixation between the pole 13 and the upper plastic part 14 and the welding part 12, thereby ensuring the stability of the connection between the various components of the top cover assembly 1, thereby improving the safety of the battery cell.

[0063] In one embodiment, referring to Figure 4 The upper plastic part 14 further includes a fifth section 145 , which is connected to an end of the fourth section 144 away from the third section 143 , and the fifth section 145 is clamped between the protruding portion 132 and the bearing portion 121 .

[0064] The raised portion 132 of the pole 13 and the bearing portion 121 of the welding piece 12 clamp the fifth section 145 in the middle, so that the position of the upper plastic part 14 on the radial direction H1 of the first through hole is further fixed, thereby further improving the stability of the connection between the upper plastic part 14 and other components. In addition, the fifth section 145 is made of insulating material, so that the pole 13 and the welding piece 12 can be insulated without providing an additional insulating coating or other insulating structure between them, thereby simplifying the manufacturing steps of the top cover assembly 1. Among them, the length of the fifth section 145 can be set as needed. For example, the fifth section 145 can extend along the bearing portion 121 to the edge of the first through hole 111.

[0065] It can be understood that in order to form the fifth section 145 of the upper molded part 14 during injection molding, the mold used for injection molding can be adjusted, and the part of the mold used to support the pole 13 is set higher than the part used to support the welding part 12, so that a certain gap is left between the pole 13 and the welding part 12 to facilitate the flow of fluid material used for injection molding.

[0066] In one embodiment, referring to Figures 2 to 4 The top cover assembly 1 further includes a seal 15 , at least a portion of which is connected to the upper surface of the bearing portion 121 , so that the seal 15 can be installed on the bearing portion 121 , and the pole 13 is connected to the seal 15 .

[0067] For example, in order to allow the seal 15 to be directly mounted on the bearing portion 121, the bottom of the seal 15 can be set to a plane so that the sealing sheet can be directly mounted on the upper surface of the bearing portion 121; a groove can also be set on the seal 15, and a corresponding protrusion can be set on the bearing portion 121, so that the seal 15 and the bearing portion 121 can be mutually engaged, and the embodiment of the present invention does not limit this. After the seal 15 is installed, the pole 13 can be directly placed on the seal 15, and then during the injection molding process, the fluid material can flow along the gap between the pole 13 and the welding part 12 and solidify into the upper plastic part 14.

[0068] In the embodiment of the present invention, the sealing member 15 can be directly installed on the bearing portion 121, so that the pole 13, the sealing member 15 and the welding ring can be first combined together and then locked by injection molding to form a connecting terminal, thereby facilitating the subsequent connection of the welding member 12 in the connecting terminal with the top cover 11, simplifying the operation steps during connection and reducing the difficulty of connection.

[0069] In one embodiment, referring to Figure 4 , a second through hole is provided on the bearing portion 121, and the sealing member 15 includes:

[0070] An installation section 151, the installation section 151 is clamped between the pole 13 and the bearing portion 121;

[0071] The connecting section 152 is connected to one end of the mounting section 151 close to the second through hole and extends toward the second through hole along the axial direction of the second through hole. The connecting section 152 abuts against the side wall of the second through hole.

[0072] The installation section 151 of the seal 15 is clamped between the pole 13 and the bearing part 121, and the connecting section 152 is in contact with the side wall of the second through hole. The cooperation between the installation section 151 and the connecting section 152 facilitates the positioning and alignment of the seal 15 during assembly, reduces human errors, simplifies the assembly process, and thus improves the production efficiency of the top cover assembly 1. The installation section 151 is clamped between the pole 13 and the bearing part 121, providing mechanical support for the pole 13, and a gap can be formed between the bottom of the pole 13 and the bearing part 121 without the aid of a mold; and the design of the connecting section 152 further limits the position and deformation of the seal 15, improves the vibration and impact resistance of the seal 15 during the use of the battery cell, and thus enhances the overall stability of the top cover assembly 1.

[0073] In one embodiment, referring to Figure 5 and Figure 6 The welding member 12 further includes a third limiting section 124 , which is disposed on a side of the second limiting section 123 away from the bearing portion 121 , and one end of the third limiting section 124 away from the second limiting section 123 is connected to the top cover 11 .

[0074] The third limiting section 124 can be welded or bonded to the top cover 11, or a buckle can be provided on the top cover 11, and a corresponding slot can be provided on the third limiting section 124, so that the top cover 11 and the third limiting section 124 can be connected. By providing a third limiting section 124, the third limiting section 124 and the second limiting section 123 can be used as positioning references for the weldment 12. The third limiting section 124 can be accurately connected to the top cover 11 by controlling the distance between the second limiting section 123 and the top cover 11 while the third limiting section 124 abuts against the top cover 11, thereby simplifying the assembly process between the weldment 12 and the top cover 11 and improving production efficiency.

[0075] In one embodiment, referring to Figure 5 The second limiting section 123 includes a first surface 1231 away from the pole 13, the third limiting section 124 is connected to the side wall of the first through hole 111, and the first surface 1231 is spaced apart from the side wall of the first through hole 111;

[0076] The upper plastic part 14 further includes a sixth section 146 connected to an end of the first section 141 away from the second section 142 . The sixth section 146 extends along the first surface 1231 so that the sixth section 146 is at least partially clamped between the side wall of the first through hole 111 and the first surface 1231 .

[0077] Since the third limiting section 124 is arranged to protrude from the first surface 1231, by controlling the third limiting section 124 to be connected to the side wall of the first through hole 111, a gap is left between the first surface 1231 and the side wall of the first through hole 111. Therefore, during the injection molding process, the fluid material can extend along the first surface 1231 of the second limiting section 123 to form a sixth section 146 clamped between the side wall of the first through hole 111 and the first surface 1231. At this time, the sixth section 146 and the fourth section 144 jointly clamp the second limiting section 123 of the weldment 12, thereby increasing the fixing effect of the upper plastic part 14 on the weldment 12, reducing the probability of displacement, looseness or structural failure caused by vibration or impact, thereby improving the overall stability and tightness of the assembly.

[0078] Since the sixth section 146 is formed by filling the gap between the first surface 1231 and the side wall of the first through hole 111 with a fluid material, the sixth section 146 ensures that there is no gap between the side wall of the first through hole 111 and the second limiting section 123, which can effectively prevent external gas or liquid from penetrating into the top cover assembly 1 and causing erosion, thereby improving the sealing performance and safety performance of the top cover assembly 1. In addition, when subjected to vibration or impact, the tightly connected top cover assembly 1 is more conducive to stress dispersion, which is particularly important in battery cell application scenarios that require high safety and stability.

[0079] In one embodiment, referring to Figure 7 A connecting groove 112 is formed on the top cover 11 , a notch 1121 of the connecting groove 112 faces the side wall of the first through hole 111 , and a portion of the third limiting section 124 is accommodated in the connecting groove 112 .

[0080] By partially accommodating the third limiting section 124 in the connecting groove 112, an embedded connecting structure between the limiting section and the top cover 11 is formed, which significantly improves the stability of the connection between the third limiting section 124 and the top cover 11, thereby enhancing the stability of the entire assembly under mechanical vibration, thermal expansion and contraction or external force impact, and avoiding the loosening or displacement of the welded part 12. In addition, the setting of the connecting groove 112 provides a clear installation position for the third limiting section 124, so that the limiting section can be more easily installed on the top cover 11 during the assembly process, reducing the difficulty of assembling the top cover assembly 1, and at the same time reducing the problem of performance degradation of the top cover assembly 1 caused by assembly errors.

[0081] In some embodiments, the connecting groove 112 is located in the middle of the top cover 11, that is, the notch 1121 of the connecting groove 112 is set in the middle of the side wall of the first through hole 111, so that compared with the bottom surface of the top cover 11, the bottom surface of the welding part 12 is at a higher position, thereby avoiding the welding part 12 from affecting the pole pieces, pole ears and other structures inside the battery cell.

[0082] In some embodiments, the connecting groove 112 is located at the bottom of the top cover 11. At this time, the connecting groove 112 has a notch 1121 facing the bottom surface of the top cover 11, so that when the welding part 12 is installed, the third limiting section 124 can be installed in the connecting groove 112 by moving from bottom to top, thereby reducing the difficulty of assembling the top cover assembly 1.

[0083] In one embodiment, along the axial direction H2 of the first through hole, the ratio of the size of the third limiting segment 124 to the size of the top cover 11 is between 0.2 and 0.5.

[0084] If the ratio of the size of the third limiting section 124 to the size of the top cover 11 is less than 0.2, the thickness of the third limiting section 124 is too small, and the structural strength of the third limiting section 124 is low, resulting in poor connection strength between the third limiting section 124 and the top cover 11. If the ratio of the size of the third limiting section 124 to the size of the top cover 11 is greater than 0.5, the thickness of the third limiting section 124 is too large, and the space occupied is large, so that the connection groove 112 is also large, which easily leads to a small thickness of the top cover 11 at the position where the connection groove 112 is provided, and the structural strength of the top cover 11 is low. Therefore, in the embodiment of the present invention, the ratio of the size of the third limiting segment 124 to the size of the top cover 11 is set between 0.2 and 0.5. Exemplarily, it can be 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.35, 0.4, 0.45, or 0.5. This allows the third limiting segment 124 to maintain a high structural strength while eliminating the need to open an overly large connecting groove 112 on the top cover 11, thereby reducing the negative impact on the top cover 11.

[0085] In one embodiment, referring to Figure 5 and Figure 6 There are at least two first limiting segments 122 and at least two second limiting segments 123, and the at least two first limiting segments 122 are arranged opposite to each other, so that the bearing portion 121, the first limiting segment 122 and the second limiting segment 123 form an opening 125, and the pole 13 can be inserted between the second limiting segments 123 through the opening 125.

[0086] The design of the opening 125 formed by the bearing portion 121, the first limiting section 122 and the second limiting section 123 allows the pole 13 to be directly inserted from the opening 125 into the second limiting section 123 without a complicated operation path, thereby simplifying the assembly process, reducing the production difficulty and the precision requirements for assembly equipment, improving production efficiency, and reducing the possibility of human error.

[0087] In one embodiment, referring to Figure 1 A positioning hole 133 is formed on the upper surface of the pole 13, and the positioning hole 133 is in a strip shape.

[0088] By observing the relative position and angle between the strip-shaped positioning hole 133 and the weldment 12, it can be determined whether the pole 13 and the weldment 12 are precisely matched, so as to adjust the direction and position of the pole 13 in a targeted manner, reduce the positioning error caused by the offset of the pole 13, and thus improve the overall assembly accuracy. For example, when the positioning hole 133 is perpendicular to the second limiting section 123 on the weldment 12, the pole 13 is at an accurate angle, so that it is convenient for the staff to check the installation status of the pole 13, thereby improving the yield rate of the top cover assembly 1. It can be understood that the shape of the positioning hole 133 can be set according to actual needs. For example, the positioning hole 133 can be rectangular, elliptical or other shapes. It only needs to be able to judge the angle of the pole 13 with the help of the positioning hole 133. The embodiment of the present invention does not limit this.

[0089] According to a second aspect of the present invention, referring to Figure 8 , a method for manufacturing a top cover assembly 1 is provided, comprising:

[0090] S100: Obtain a sealing member 15, a top cover 11, a welding member 12 and a pole 13; wherein the top cover 11 is provided with a first through hole 111; the welding member 12 comprises a bearing portion 121, a first limiting segment 122 and a second limiting segment 123, wherein the first limiting segment 122 and the bearing portion 121 are provided at both ends of the second limiting segment 123 and extend toward the middle of the welding member 12; the pole 13 comprises a main body 131 and a protruding portion 132, wherein the protruding portion 132 is provided protrudingly on the peripheral side surface of the main body 131;

[0091] S200: Install the seal 15 on the bearing portion 121 of the welding member 12, and place the pole 13 on the seal 15, so that the main body 131 is spaced apart from the first limiting section 122, the raised portion 132 is spaced apart from the first limiting section 122, and the raised portion 132 is spaced apart from the second limiting section 123;

[0092] S300: performing injection molding along the side wall of the main body 131 of the pole 13, and allowing the fluid material to flow through between the main body 131 and the first limiting section 122, between the main body 131 and the first limiting section 122, and between the protrusion 132 and the second limiting section 123 in sequence, and forming an upper plastic part 14;

[0093] S400: The upper plastic part 14, the welding part 12, the sealing part 15 and the pole 13 are locked with each other to form a connection terminal;

[0094] S500 : performing sealing welding on the welding piece 12 in the connection terminal and the top cover 11 .

[0095] By installing the seal 15 on the welding part 12 and placing the pole 13 on the seal 15, the seal 15, the welding part 12 and the pole 13 are combined into an intermediate component, and there is a continuous gap including multiple bends inside the intermediate component, so that in the subsequent injection molding process, the fluid material can flow along the gap and solidify to form the upper plastic part 14, and then form a connecting terminal and achieve self-locking. At this time, the welding part 12 in the connecting terminal is sealed and welded to the top cover 11 to complete the production of the top cover assembly 1. In the embodiment of the present invention, the seal 15, the welding part 12, the pole 13 and the upper plastic part 14 are first formed into a connecting terminal, so that the connecting terminal is welded to the top cover 11 as a whole, which greatly simplifies the welding process, reduces the probability of errors in the welding process, and improves the production efficiency of the top cover assembly 1.

[0096] In one embodiment, referring to Fig. 9 The top cover 11 is provided with a first through hole 111, the welding member 12 includes a bearing portion 121, a first limiting segment 122 and a second limiting segment 123, there are at least two first limiting segments 122 and a second limiting segment 123, and at least two second limiting segments 123 are arranged opposite to each other, so that the bearing portion 121, the first limiting segment 122 and the second limiting segment 123 form an opening 125, and placing the pole 13 on the sealing member 15 includes:

[0097] S210: inserting the pole 13 from the opening 125 into the spaced second limiting sections 123;

[0098] Since the pole 13 includes a main body 131 with a smaller radial dimension and a protrusion 132 with a larger radial dimension, if the second limiting section 123 is set in a ring shape, the installation of the pole 13 is more difficult, and the pole 13 often needs to be turned over, which usually needs to be done manually by a staff member. Therefore, in the embodiment of the present invention, at least two second limiting sections 123 are arranged at intervals, so that the pole 13 can be directly inserted from the opening 125 formed by the bearing portion 121, the first limiting section 122 and the second limiting section 123, which simplifies the installation steps of the pole 13, and the installation of the pole 13 can be completed by a machine, thereby improving the installation efficiency of the top cover assembly 1.

[0099] S220 : adjusting the position of the pole 13 so that the pole lug can be connected to the pole 13 through the first through hole 111 .

[0100] In order to connect the pole 13 with the pole lug, it is necessary to ensure that the pole 13 corresponds to the first through hole 111, so that the pole lug can be connected to the pole 13 through the first through hole 111, thereby ensuring that the battery cell can be used normally.

[0101] In one embodiment, referring to Fig.10The upper surface of the pole 13 is provided with a positioning hole 133, and the positioning hole 133 is strip-shaped. Placing the pole 13 on the seal 15 also includes:

[0102] S230: Rotate the pole 13 so that the angle between the positioning hole 133 and the welding piece 12 is a preset angle.

[0103] By observing the relative position and angle between the strip-shaped positioning hole 133 and the welding part 12, it can be determined whether the pole 13 and the welding part 12 are precisely matched, so as to adjust the direction and position of the pole 13 in a targeted manner, reduce the positioning error caused by the offset of the pole 13, and thus improve the overall assembly accuracy. For example, the preset angle can be set to 90°, so that when the positioning hole 133 is perpendicular to the second limiting section 123 on the welding part 12, the pole 13 is at an accurate angle, so that it is convenient for the staff to check the installation status of the pole 13, thereby improving the yield rate of the top cover assembly 1.

[0104] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A top cover assembly, characterized in that: Used to connect the tabs in the battery cell, the top cover assembly includes: A top cover, wherein a first through hole is provided on the top cover; A welding member, at least a portion of which is disposed in the first through hole, the welding member comprising a bearing portion, a first limiting segment and a second limiting segment, and along the axial direction of the first through hole, the first limiting segment and the bearing portion are disposed at two ends of the second limiting segment and extend toward the first through hole; A pole, the pole is spaced apart from the welding piece, the pole comprises a main body and a raised portion, the raised portion is convexly arranged on the peripheral side surface of the main body; The upper plastic part includes a first section, a second section, a third section and a fourth section connected in sequence, the second section is clamped between the first limiting section and the main body, the first section and the third section are respectively connected to the two ends of the second section along the axial direction of the first through hole and extend in a direction away from the pole, the first limiting section is at least partially clamped between the first section and the third section, and the fourth section is clamped between the second limiting section and the protrusion.

2. The top cover assembly according to claim 1, characterized in that: The upper plastic part further includes a fifth section, the fifth section is connected to an end of the fourth section away from the third section, and the fifth section is clamped between the protruding portion and the bearing portion.

3. The top cover assembly according to claim 1, characterized in that: The top cover assembly further includes a seal, at least a portion of which is connected to the upper surface of the bearing portion so that the seal can be installed on the bearing portion, and the pole is connected to the seal.

4. The top cover assembly according to claim 3, characterized in that: The bearing portion is provided with a second through hole, and the sealing member comprises: A mounting section, the mounting section being clamped between the pole and the bearing portion; A connecting section is connected to one end of the mounting section close to the second through hole and extends toward the second through hole along the axial direction of the second through hole, and the connecting section abuts against a side wall of the second through hole.

5. The top cover assembly according to claim 1, characterized in that: The welding part further includes a third limiting section, which is arranged on a side of the second limiting section away from the bearing portion, and one end of the third limiting section away from the second limiting section is connected to the top cover.

6. The top cover assembly according to claim 5, characterized in that: The second limiting section includes a first surface facing away from the pole, the third limiting section is connected to the side wall of the first through hole, and the first surface is spaced apart from the side wall of the first through hole; The upper plastic part further includes a sixth section, which is connected to an end of the first section away from the second section and extends along the first surface so that the sixth section is at least partially clamped between the side wall of the first through hole and the first surface.

7. The top cover assembly according to claim 6, characterized in that: The top cover is provided with a connecting groove, the notch of the connecting groove faces the side wall of the first through hole, and part of the third limiting section is accommodated in the connecting groove.

8. The top cover assembly according to claim 7, characterized in that: Along the axial direction of the first through hole, a ratio of a size of the third limiting segment to a size of the top cover is between 0.2 and 0.

5.

9. The top cover assembly according to any one of claims 1 to 8, characterized in that: There are at least two first limiting segments and at least two second limiting segments, and at least two second limiting segments are arranged opposite to each other, so that the bearing portion, the first limiting segment and the second limiting segment form an opening, and the pole can be inserted between the second limiting segments from the opening.

10. The top cover assembly according to any one of claims 1 to 8, characterized in that: A positioning hole is provided on the upper surface of the pole, and the positioning hole is in a strip shape.

11. A method for manufacturing a top cover assembly, characterized in that: include: A sealing member, a top cover, a welding member and a pole are obtained; wherein the top cover is provided with a first through hole; the welding member comprises a bearing portion, a first limiting segment and a second limiting segment, wherein the first limiting segment and the bearing portion are provided at both ends of the second limiting segment and extend toward the middle of the welding member; the pole comprises a main body and a raised portion, wherein the raised portion is provided on the peripheral side surface of the main body; Install the seal on the bearing portion of the welded component, and place the pole on the seal, so that the main body is spaced apart from the first limiting segment, the raised portion is spaced apart from the first limiting segment, and the raised portion is spaced apart from the second limiting segment; Injection molding is performed along the side wall of the main body of the pole, and the fluid material is allowed to flow sequentially between the main body and the first limiting section, between the main body and the first limiting section, and between the protruding portion and the second limiting section to form an upper plastic part; The upper plastic part, the welding part, the sealing part and the pole are locked with each other to form a connecting terminal; The welding piece in the connecting terminal is sealed and welded with the top cover.

12. The manufacturing method according to claim 11, characterized in that: The top cover is provided with a first through hole, the welding piece includes a bearing portion, a first limiting segment and a second limiting segment, the first limiting segment and the second limiting segment each have at least two, and at least two second limiting segments are arranged opposite to each other, so that the bearing portion, the first limiting segment and the second limiting segment form an opening, and placing the pole on the sealing member includes: Inserting the pole from the opening into the interval-arranged second limiting sections; The position of the pole is adjusted so that the pole lug can be connected to the pole through the first through hole.

13. The manufacturing method according to claim 12, characterized in that: The upper surface of the pole is provided with a positioning hole, and the positioning hole is strip-shaped. The placing of the pole on the sealing member further comprises: The pole is rotated so that the angle between the positioning hole and the welding piece is a preset angle.

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