Cover plate assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate assembly and a battery. The lower plastic part is arranged on one side of the cover plate body, and the lower plastic part and the cover plate body abut against each other and are relatively fixed; the end plate is arranged on the side, away from the cover plate body, of the lower plastic part and abuts against the lower plastic part, a clamping groove is fixedly formed in one of the end plate and the lower plastic part, a clamping part is fixedly arranged on the other one of the end plate and the lower plastic part, the clamping part corresponds to the clamping groove, and the clamping part is connected with the clamping groove in a clamped mode. The clamping groove is formed in one of the end plate and the lower plastic part, the clamping part is arranged on the other one of the end plate and the lower plastic part, and the clamping part is clamped with the clamping groove, so that the end plate and the lower plastic part are relatively fixed, the end plate is limited to shake relative to the lower plastic part and the cover plate body, the end plate is limited to shake in the battery shell, and the phenomenon that the end plate shakes relative to the shell to damage a tab is avoided; the tab is prevented from being torn, the tab is protected, and the quality of the battery is improved.

Description

Technical Field

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

[0002] The battery structure mainly includes: shell, cover, end plate, side plate, bare cell insulation sheet, pole group, etc. Among them, after the cover and shell are welded, a closed space with a certain mechanical strength is formed to protect the pole group; the side plate and bare cell insulation sheet are fixed by hot melt and wrapped on the outside of the pole group. In addition, the bare cell insulation sheet is also melted and fixed with the lower plastic part on the cover, so that the pole group is well fixed in the shell; the end plate is located between the cover and the pole group, and the end plate is connected to the bare cell insulation sheet, and the pole group is insulated and wrapped, which is convenient for the pole group to enter the shell. The baffle part in the middle of the end plate also isolates and protects the pole ear of the pole group to prevent the pole ear from stretching and damaging or bending to touch the lower pole group and cause a short circuit.

[0003] However, currently most bare cell insulation sheets are made of Mylar film (tough polyester polymer). Inside the shell, the end plates are mainly fixed by hot melting with the Mylar film, and the connection strength is low. The stability of the end plates in the battery is poor. When the battery is subjected to severe working conditions such as vibration, the end plates are prone to shaking inside the battery, and the protective effect of the end plates on the tabs is affected. There is a risk of tearing of the tabs, and the probability of thermal runaway and other risks in the product is high, and the safety performance is poor. Utility Model Content

[0004] In view of this, the utility model provides a cover plate assembly and a battery to solve the problem of poor stability of the end plate in the battery.

[0005] In the first aspect, the utility model provides a cover assembly, comprising: a cover body; a lower plastic part, which is arranged on one side of the cover body, and the lower plastic part is abutted against and relatively fixed to the cover body; an end plate, which is arranged on a side of the lower plastic part away from the cover body and abutted against the lower plastic part, one of the end plate and the lower plastic part is fixedly provided with a card slot and the other is fixedly provided with a card connection portion, the card connection portion is arranged corresponding to the card slot and the card connection portion is card-connected with the card slot.

[0006] Beneficial effect: by providing a card slot on one of the end plate and the lower plastic part and a card connection part on the other, the card connection part and the card slot form a snap structure, and the snap connection part is engaged with the card slot to achieve relative fixation of the end plate and the lower plastic part, limit the shaking of the end plate relative to the lower plastic part and the cover plate body, and improve the overall stability of the cover plate assembly. After the cover plate assembly is assembled to the battery shell and the cover plate body is welded to the shell, the end plate can be limited from shaking in the shell, and the stability of the end plate in the battery can be improved, thereby avoiding damage to the pole ear due to shaking of the end plate relative to the shell, avoiding tearing of the pole ear, playing a role in protecting the pole ear, and improving the quality of the battery. In addition, the snap structure has a simple structural form, is easy to process, has low cost, is easy to assemble the end plate and the lower plastic part, is simple to operate, and is conducive to improving work efficiency.

[0007] In an optional embodiment, an elastic rib protruding toward the other is provided on the surface of one of the end plate and the lower plastic part, and the slot is configured on the elastic rib.

[0008] Beneficial effect: by setting the elastic rib to protrude from the surface of the component on which it is set, and the elastic rib extending toward the direction of the component provided with the clamping part, the elastic rib is close to the clamping part, which is convenient for the clamping fit between the elastic rib and the clamping part, and the elastic rib has a certain elasticity and can realize elastic deformation. During the assembly process of the clamping part and the slot, the elastic deformation of the elastic rib makes it convenient for the clamping part to be installed in the slot, and ensures that after the clamping part enters the slot, the elastic rib is elastically reset to realize the clamping of the clamping part and the slot.

[0009] In an optional embodiment, the elastic rib is provided on the surface of the lower plastic part facing the end plate, the end plate includes a base plate and a support wall protruding from the surface of the base plate, the end of the support wall away from the base plate is abutted against the lower plastic part, the support wall is provided with the clamping portion, the clamping portion protrudes from the wall surface of the support wall, and the elastic rib is located on the side of the support wall having the clamping portion.

[0010] Beneficial effect: by setting the end plate including the bottom plate and the supporting wall, the supporting wall protrudes from the bottom plate surface, and the supporting wall is supported between the lower plastic part and the bottom plate of the end plate, a gap is formed between the lower plastic part and the bottom plate, and the elastic rib is located in the gap, does not occupy additional space in the height direction, does not increase the total size of the lower plastic part and the end plate after being superimposed in the height direction, saves space, and by setting the clamping part on the supporting wall and protruding from the wall surface, it is convenient to fix the clamping part on the end plate, and the stability of the clamping part is good. The elastic rib is located on the side of the supporting wall with the clamping part, so that the elastic rib and the clamping part are arranged relative to each other, which is convenient for the clamping part to cooperate with the clamping groove on the elastic rib, and the assembly of the clamping part and the elastic rib can be achieved when the end plate is pushed toward the lower plastic part, and the operation is simple.

[0011] In an optional embodiment, the slot is a through slot, and the clamping portion passes through the slot; the edge of the clamping portion close to the lower plastic part body is chamfered to form a first guide surface, and the first guide surface is suitable for providing guidance for the assembly of the end plate and the lower plastic part; and / or, the edge of the clamping portion away from the lower plastic part body is chamfered to form a second guide surface, and the second guide surface is suitable for providing guidance for the clamping portion to enter the slot.

[0012] Beneficial effects: By setting the card slot as a through slot, it is convenient for the card connection part to pass through the card slot, thereby improving the stability of the card connection between the card connection part and the card slot, and by setting the edge of the card connection part close to the lower plastic body to form a first guide surface, when the end plate approaches the lower plastic, the first guide surface contacts the elastic rib to provide guidance, which facilitates the assembly of the end plate, reduces the difficulty of operation, and improves production efficiency. By setting the edge of the card connection part away from the lower plastic to form a second guide surface, when the card connection part reaches the position of the card slot, the second guide surface provides guidance for the card connection part to extend into the card slot, which facilitates the card connection part to smoothly enter the card slot, realizes the card connection between the card connection part and the card slot, improves assembly accuracy and assembly efficiency, and the chamfer is easy to process, and the processing cost is low.

[0013] In an optional embodiment, the elastic rib includes two first connecting sections and a second connecting section connecting the two first connecting sections, one end of the first connecting section is connected to the lower plastic part body, and the second connecting section is connected to an end of the second connecting section away from the lower plastic part body; the edge of the second connecting section away from the lower plastic part body and close to the root of the clamping part is chamfered to form a third guide surface, and the third guide surface is suitable for providing guidance for the assembly of the end plate and the lower plastic part; and / or, the edge of the second connecting section close to the lower plastic part body and close to the root of the clamping part is rounded to form a fourth guide surface, and the fourth guide surface is suitable for providing guidance for the clamping part to enter the slot.

[0014] Beneficial effect: By constructing the edge of the second connecting section on the elastic rib away from the lower plastic part and close to the root of the clamping part as a chamfer, a third guide surface arranged obliquely is formed, and the third guide surface provides guidance for the clamping part on the end plate, so that the clamping part can move toward the direction close to the body of the lower plastic part, thereby providing guidance for the movement of the end plate toward the lower plastic part, facilitating the assembly of the end plate and the lower plastic part, and helping to improve assembly efficiency. By constructing the edge of the second connecting section close to the lower plastic part and close to the root of the clamping part as a rounded corner, a fourth guide surface with a smooth transition is formed. In the process of the clamping part extending into the slot, the fourth guide surface first contacts the second guide surface on the clamping part. Through the cooperation of the fourth guide surface and the second guide surface, a guide is provided for the clamping part to enter the slot, ensuring that the clamping part smoothly enters the slot, realizing the clamping of the clamping part and the slot, improving assembly efficiency, and the fourth guide surface with a smooth transition can avoid damaging the clamping part, thereby ensuring product quality.

[0015] In an optional implementation, a dimension of the third guide surface along the length direction of the lower plastic part is W1, and a dimension of the third guide surface along the height direction of the lower plastic part is W2, wherein W1≥W2.

[0016] Beneficial effect: By setting the dimension of the third guide surface along the length direction to be greater than or equal to its dimension along the height direction, the third guide surface can provide guidance, which is beneficial to correct the end plate, ensure assembly accuracy, and improve assembly efficiency.

[0017] In an optional embodiment, the number of the elastic ribs is two, and the lower plastic part is provided with one elastic rib at each end along its length direction; the number of the clamping parts is two, and the end plate is provided with one clamping part at each end along its length direction, and the two clamping parts correspond one to one with the two elastic ribs.

[0018] Beneficial effect: By arranging an elastic rib at each end of the lower plastic part in the length direction, and arranging a clamping part corresponding to the elastic rib at each end of the end plate in the length direction, each clamping part is clamped with the clamping groove on the corresponding elastic rib, so that the end plate and the lower plastic part are clamped through two sets of clamping structures, thereby improving the stability of the clamping between the end plate and the lower plastic part, further improving the stability of the cover plate assembly, effectively limiting the shaking of the end plate in the battery casing, protecting the pole ear from being torn, and the clamping structure located at both ends is not only convenient for processing but also convenient for assembly.

[0019] In an optional embodiment, a dimension of the clamping portion along the width direction of the end plate is L1, and a dimension of the clamping groove along the width direction of the lower plastic part is L2, wherein L2-L1≥1 mm.

[0020] Beneficial effect: By setting the width dimension L2 of the card slot to be greater than the width dimension L1 of the card connection portion 310 and the difference between the two being greater than or equal to 1 mm, it can be ensured that the card connection portion can be smoothly inserted into the card slot, thereby reducing the difficulty of assembly and improving assembly efficiency.

[0021] In an optional embodiment, a dimension L1 of the clamping portion along the width direction of the end plate ranges from 3 mm to 10 mm.

[0022] Beneficial effect: By setting the dimension L1 of the clamping part along the width direction of the end plate within the range of 3mm-10mm, it can be ensured that the clamping part has sufficient strength and the stability of the clamping part and the slot after being clamped, thereby ensuring the relative fixation of the end plate and the lower plastic part, avoiding the end plate from shaking in the shell, and protecting the tab from damage; it can also ensure the smooth assembly of the clamping part and the slot, thereby improving the assembly efficiency.

[0023] In the second aspect, the utility model further provides a battery, comprising: a shell having an open end; a pole group placed in the shell; the above-mentioned cover plate assembly, wherein the cover plate assembly is arranged at the open end of the shell, the cover plate body is welded to the shell to close the shell, the lower plastic part is located on the side of the cover plate body facing the inside of the shell, and the end plate is located between the lower plastic part and the pole group. Because the battery includes the cover plate assembly, it has the same effect as the cover plate assembly, and it is not repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a structural schematic diagram of a cover plate assembly according to an embodiment of the utility model;

[0026] Figure 2 for Figure 1 A top view of the cover assembly shown;

[0027] Figure 3 for Figure 2 Sectional view in the AA direction;

[0028] Figure 4 for Figure 3 A is a partial enlarged schematic diagram;

[0029] Figure 5 This is a schematic structural diagram of a lower plastic part according to an embodiment of the utility model;

[0030] Figure 6 for Figure 5 The structural schematic diagram of the lower plastic part shown in FIG.

[0031] Figure 7 for Figure 5 A structural schematic diagram of the lower plastic part from another perspective shown;

[0032] Figure 8 for Figure 5 A top view of the lower plastic part shown;

[0033] Fig. 9 for Figure 8 Cross-sectional view in the BB direction;

[0034] Fig.10 for Fig. 9 A partial enlarged schematic diagram of B in the middle;

[0035] Fig.11 This is a schematic structural diagram of an end plate according to an embodiment of the utility model;

[0036] Fig.12 for Fig.11 A schematic structural diagram of the end plate from another perspective shown;

[0037] Fig.13 for Fig.11 A top view of the end plate is shown;

[0038] Fig.14 for Fig.13 Cross-sectional view along CC direction.

[0039] Description of reference numerals:

[0040] 1. Cover plate body; 2. Lower plastic part; 210. Elastic rib; 211. Third guide surface; 212. Fourth guide surface; 213. Second matching surface; 201. Slot; 202. First connecting section; 203. Second connecting section; 220. Lower plastic part body; 230. Through hole; 3. End plate; 301. Bottom plate; 302. Support wall; 310. Clamping part; 311. First guide surface; 312. Second guide surface; 313. First matching surface; 4. Pole. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0042] Combine the following Figures 1 to 14 , describing an embodiment of the utility model.

[0043] According to an embodiment of the utility model, on the one hand, a cover assembly is provided, comprising: a cover body 1, a lower plastic part 2 and an end plate 3. The lower plastic part 2 is arranged on one side of the cover body 1, and the lower plastic part 2 abuts against the cover body 1 and is relatively fixed; the end plate 3 is arranged on a side of the lower plastic part 2 away from the cover body 1 and abuts against the lower plastic part 2, and a clamping groove 201 is fixedly arranged on one of the end plate 3 and the lower plastic part 2, and a clamping portion 310 is fixedly arranged on the other, and the clamping portion 310 is arranged corresponding to the clamping groove 201 and the clamping portion 310 is clamped with the clamping groove 201.

[0044] The cover plate assembly of the present embodiment is applied, by providing a slot 201 on one of the end plate 3 and the lower plastic part 2 and a snap-on portion 310 on the other, the snap-on portion 310 and the slot 201 form a snap-on structure, and the snap-on portion 310 is snapped with the slot 201 to achieve relative fixation of the end plate 3 and the lower plastic part 2, limit the shaking of the end plate 3 relative to the lower plastic part 2 and the cover plate body 1, and improve the overall stability of the cover plate assembly, and then after the cover plate assembly is assembled to the battery shell and the cover plate body 1 is welded to the shell, the end plate 3 can be limited to shake in the shell, and the stability of the end plate 3 in the battery can be improved, thereby avoiding damage to the pole ear due to shaking of the end plate 3 relative to the shell, avoiding tearing of the pole ear, playing a role in protecting the pole ear, and improving the quality of the battery. In addition, the snap-on structure has a simple structural form, is easy to process, has low cost, is easy to assemble the end plate 3 with the lower plastic part 2, is simple to operate, and is conducive to improving work efficiency.

[0045] It should be noted that the lower plastic part 2 is a lower plastic and is arranged on the side of the cover body 1 facing the inside of the battery housing; the lower plastic part 2 and the cover body 1 are fixed by riveting the pole 4 on the cover assembly to achieve relative fixation of the lower plastic part 2 and the cover body 1.

[0046] In one embodiment, an elastic rib 210 protruding toward the other is provided on the surface of one of the end plate 3 and the lower plastic part 2, and a clamping slot 201 is constructed on the elastic rib 210. By providing the elastic rib 210 protruding from the surface of the component on which it is provided, and the elastic rib 210 extending toward the component provided with the clamping portion 310, the elastic rib 210 is close to the clamping portion 310, which facilitates the clamping fit between the elastic rib 210 and the clamping portion 310, and the elastic rib 210 has a certain elasticity and can achieve elastic deformation. During the assembly process of the clamping portion 310 and the clamping slot 201, the elastic deformation of the elastic rib 210 facilitates the insertion of the clamping portion 310 into the clamping slot 201, and ensures that after the clamping portion 310 enters the clamping slot 201, the elastic rib 210 is elastically reset to achieve the clamping fit between the clamping portion 310 and the clamping slot 201. It should be noted that when the elastic rib 210 is set on the lower plastic part 2, the elastic rib 210 is connected to the surface of the lower plastic part 2 facing the end plate 3 and the elastic rib 210 protrudes from the surface; when the elastic rib 210 is set on the end plate 3, the elastic rib 210 is connected to the surface of the end plate 3 facing the lower plastic part 2 and the elastic rib 210 protrudes from the surface.

[0047] In one embodiment, an elastic rib 210 is disposed on the surface of the lower plastic part 2 facing the end plate 3, the end plate 3 includes a bottom plate 301 and a support wall 302 protruding from the surface of the bottom plate 301, one end of the support wall 302 away from the bottom plate 301 abuts against the lower plastic part 2, a clamping portion 310 is disposed on the support wall 302, the clamping portion 310 protrudes from the wall surface of the support wall 302, and the elastic rib 210 is located on the side of the support wall 302 having the clamping portion 310. That is, the elastic rib 210 is disposed on the lower plastic part 2, and the clamping portion 310 is disposed on the end plate 3. By setting the end plate 3 to include a bottom plate 301 and a support wall 302, the support wall 302 protrudes from the surface of the bottom plate 301, and the support wall 302 is supported between the lower plastic part 2 and the bottom plate 301 of the end plate 3, a gap is formed between the lower plastic part 2 and the bottom plate 301, and the elastic rib 210 is located in the gap, which does not occupy additional space in the height direction, does not increase the total size of the lower plastic part 2 and the end plate 3 in the height direction after being superimposed, saves space, and by setting the clamping portion 310 The support wall 302 protrudes from the wall surface, which is convenient for fixing the clamping part 310 on the end plate 3. The clamping part 310 has good stability. The elastic rib 210 is located on the side of the support wall 302 with the clamping part 310, so that the elastic rib 210 and the clamping part 310 are arranged relative to each other, which is convenient for the clamping part 310 to cooperate with the clamping groove 201 on the elastic rib 210. When the end plate 3 is pushed toward the lower plastic part 2, the clamping part 310 and the elastic rib 210 can be assembled, which is simple to operate. Figure 3 The arrow in the middle points to the "height direction".

[0048] It should be noted that the support wall 302 is formed by extending a partial area on the bottom plate 301 toward the direction close to the lower plastic part 2, and the support wall 302 includes at least four peripheral walls, which are connected end to end to form a receiving space. Preferably, the clamping portion 310 is arranged on the peripheral wall and is located on the side of the peripheral wall facing the inside of the receiving space. Correspondingly, the elastic rib 210 is located inside the receiving space. When the cover assembly is assembled with the shell, the side of the support wall 302 of the end plate 3 away from the receiving space can abut against the inner wall of the shell, further ensuring the stability of the cover assembly. It can be understood that, as a replaceable embodiment, the clamping portion 310 can be located on the side of the peripheral wall away from the receiving space. Correspondingly, the elastic rib 210 is located outside the receiving space, and the clamping portion 310 and the card slot 201 can also be clamped. In addition, the support wall 302 may also include an inner support wall arranged inside the accommodation space surrounded by the outer peripheral wall. The number of the inner support walls is one or more, preferably two, and the two inner support walls are arranged at intervals along the length direction of the end plate 3 to divide the accommodation space into three accommodation cavities. The clamping portion 310 may also be arranged on the inner support wall. The clamping portion 310 protrudes from the wall surface of the inner support wall along the length direction of the end plate 3. The elastic rib 210 is arranged corresponding to the clamping portion 310. Similarly, the relative fixation of the end plate 3 and the lower plastic part 2 can be achieved by the cooperation of the clamping portion 310 and the clamping groove 201. Among them, the length direction of the end plate 3 refers to Fig.11 The arrow in the middle points to the "length direction".

[0049] In addition, in other embodiments, the elastic rib 210 is arranged on the end plate 3, and the clamping portion 310 is arranged on the lower plastic part 2. Specifically, the elastic rib 210 is arranged on the surface of the bottom plate 301 of the end plate 3 facing the lower plastic part 2, and the elastic rib 210 protrudes from the surface of the bottom plate 301 toward the direction of the lower plastic part 2. A hook-shaped clamping portion 310 is connected to the side of the lower plastic part 2 facing the end plate 3, and the hook portion of the hook extends into the slot 201 on the elastic rib 210, which can also realize the clamping of the clamping portion 310 and the slot 201, thereby realizing the relative fixation of the lower plastic part 2 and the end plate 3.

[0050] The following description will be made by taking the example that the elastic rib 210 is arranged on the lower plastic part 2 and the clamping portion 310 is arranged on the end plate 3 .

[0051] In one embodiment, the slot 201 is a through slot, and the clamping portion 310 passes through the slot 201; the edge of the clamping portion 310 close to the lower plastic body 220 is chamfered to form a first guide surface 311, and the first guide surface 311 is suitable for providing guidance for the assembly of the end plate 3 and the lower plastic part 2. By setting the slot 201 as a through slot, it is convenient for the clamping portion 310 to pass through the slot 201, thereby improving the stability of the clamping of the clamping portion 310 and the slot 201, and by setting the edge of the clamping portion 310 close to the lower plastic body 220 to form the first guide surface 311, when the end plate 3 approaches the lower plastic part 2, the first guide surface 311 contacts the elastic rib 210 to provide guidance, so that the end plate 3 is easily assembled in place, the difficulty of operation is reduced, and the production efficiency is improved. Among them, the edge of the clamping portion 310 close to the lower plastic part body 220 refers to the edge of the clamping portion 310 close to the lower plastic part body 220 and away from the supporting wall 302 connected to the clamping portion 310; during the assembly process of the end plate 3 and the lower plastic part 2, the end plate 3 moves from the direction away from the lower plastic part 2 to the direction close to the lower plastic part 2, and the first guide surface 311 first contacts the elastic rib 210 on the lower plastic part 2. The first guide surface 311 is set obliquely. Even if the end plate 3 is slightly misaligned with respect to the lower plastic part 2 during assembly, it can be corrected by the guidance of the first guide surface 311, thereby realizing rapid assembly of the end plate 3 and the lower plastic part 2.

[0052] It should be noted that the through groove refers to a groove that passes through the elastic rib 210 in the thickness direction. When the clamping portion 310 is arranged on the outer peripheral wall or the inner supporting wall at both ends of the end plate 3 in the length direction, the clamping portion 310 protrudes from the wall surface of the supporting wall 302 along the length direction of the end plate 3, then the thickness direction of the elastic rib 210 is in the same direction as the length direction of the end plate 3, and the clamping groove 201 passes through the elastic rib 210 in the length direction of the end plate 3. Similarly, when the clamping portion 310 is arranged on the outer peripheral wall on both sides of the width direction of the end plate 3, the clamping portion 310 protrudes from the wall surface of the supporting wall 302 in the width direction of the end plate 3, then the thickness direction of the elastic rib 210 is in the same direction as the width direction of the end plate 3, and the clamping groove 201 passes through the elastic rib 210 in the width direction of the end plate 3, wherein the width direction of the end plate 3 refers to Fig.11 The arrow in the figure indicates the "width direction". Figure 4 As shown, the dimension of the clamping part 310 along the thickness direction of the elastic rib 210 is greater than the thickness of the elastic rib 210, that is, when the clamping part 310 is clamped with the clamping slot 201, the clamping part 310 penetrates from one side of the clamping slot 201 and extends from the other side, thereby improving the stability of the clamping part 310 and the clamping slot 201 and avoiding disengagement. The lower plastic body 220 refers to the main part of the lower plastic part 2 in a plate shape.

[0053] In one embodiment, the edge of the clamping portion 310 away from the lower plastic part 2 is chamfered to form a second guide surface 312, and the second guide surface 312 is suitable for providing guidance for the clamping portion 310 to enter the clamping slot 201. The edge of the clamping portion 310 away from the lower plastic part 2 refers to the edge of the clamping portion 310 away from the lower plastic part 2 and away from the supporting wall 302 connected to the clamping portion 310; in the process of the clamping portion 310 extending into the clamping slot 201, the second guide surface 312 first contacts the edge of the clamping slot 201, and the second guide surface 312 is arranged to be inclined to facilitate the clamping portion 310 to enter the clamping slot 201. A second guide surface 312 is formed at the edge of the clamping portion 310 away from the lower plastic part 2. When the clamping portion 310 reaches the position of the clamping slot 201, the second guide surface 312 provides guidance for the clamping portion 310 to extend into the clamping slot 201, so that the clamping portion 310 can smoothly enter the clamping slot 201, thereby achieving the clamping connection between the clamping portion 310 and the clamping slot 201, improving the assembly accuracy and efficiency, and the chamfering is easy to process, and the processing cost is low.

[0054] In one embodiment, the elastic rib 210 includes two first connecting sections 202 and a second connecting section 203 connecting the two first connecting sections 202. One end of the first connecting section 202 is connected to the lower plastic part 2, and the second connecting section 203 is connected to an end of the second connecting section 203 away from the lower plastic part 2. The edge of the second connecting section 203 away from the lower plastic part 2 and close to the root of the clamping portion 310 is chamfered to form a third guide surface 211. The third guide surface 211 is suitable for providing guidance for the assembly of the end plate 3 and the lower plastic part 2. Figures 5 and 6 In the handle shape shown, the second connecting section 203 is spaced from the lower plastic part 2, and the through groove formed between the two first connecting sections 202, the second connecting section 203 and the lower plastic part body 220 is the clamping groove 201; the root of the clamping portion 310 refers to the end portion where the clamping portion 310 is connected to the supporting wall 302. By constructing the edge of the second connecting section 203 on the elastic rib 210 away from the lower plastic part 2 and close to the root of the clamping portion 310 as a chamfer, an inclined third guide surface 211 is formed, and the third guide surface 211 provides guidance for the clamping portion 310 on the end plate 3, so that the clamping portion 310 can move toward the direction close to the lower plastic part body, thereby providing guidance for the movement of the end plate 3 toward the lower plastic part 2, so as to facilitate the assembly of the end plate 3 and the lower plastic part 2, which is conducive to improving the assembly efficiency.

[0055] It should be noted that, during the assembly process of the end plate 3 and the lower plastic part 2, the end plate 3 moves from the direction away from the lower plastic part 2 to the direction close to the lower plastic part 2, and the third guide surface 211 of the elastic rib 210 first contacts the first guide surface 311 of the clamping portion 310. The third guide surface 211 is inclined to provide guidance for the movement of the end plate 3 toward the lower plastic part body 220. Even if the end plate 3 is slightly misaligned relative to the lower plastic part 2 during assembly, it can be corrected by the matching guidance of the third guide surface 211 and the first guide surface 311. The side of the clamping portion 310 away from the lower plastic part body 220 forms a first matching surface 313, and the side of the second connecting section 203 close to the lower plastic part body 220 forms a second matching surface 213, and the first matching surface 313 is opposite to and fits the second matching surface 213.

[0056] In one embodiment, further combining Figures 9 and 10 As shown, the dimension of the third guide surface 211 along the length direction of the lower plastic part 2 is W1, and the dimension of the third guide surface 211 along the height direction of the lower plastic part 2 is W2, wherein W1≥W2. Figures 9 and 10 The arrow in the middle refers to the "length direction"; the height direction refers to Figures 9 and 10 The "height direction" indicated by the middle arrow. When the dimension W1 of the third guide surface 211 along the length direction is equal to its dimension W2 along the height direction, the chamfer at this point is 45°, which is convenient for processing and molding; when W1 is greater than W2, that is, the chamfer is cut deeper along the length direction, since the end plate 3 comes from the direction away from the lower plastic body 220, the clamping portion 310 on the end plate 3 first contacts the side of the elastic rib 210 away from the lower plastic body 220, that is, the side of the elastic rib 210 with a deeper cut angle. In this way, even if the end plate 3 is installed offset, it can be guided by the third guide surface 211, which is convenient for assembling the end plate 3 and the lower plastic part 2. Therefore, by setting the dimension of the third guide surface 211 along the length direction to be greater than or equal to its dimension along the height direction, it is convenient for the third guide surface 211 to provide guidance, which is beneficial to correct the deviation of the end plate 3, ensure assembly accuracy, and improve assembly efficiency.

[0057] In one embodiment, the edge of the second connecting section 203 close to the lower plastic part 2 and close to the root of the clamping portion 310 is rounded to form a fourth guide surface 212, which is suitable for providing guidance for the clamping portion 310 to enter the clamping groove 201. If the rounded corner is smooth, the fourth guide surface 212 will have a smooth transition. By constructing the edge of the second connecting section 203 close to the lower plastic part 2 and close to the root of the clamping portion 310 as a rounded corner, a fourth guide surface 212 with a smooth transition is formed. When the clamping portion 310 extends into the slot 201, the fourth guide surface 212 first contacts the second guide surface 312 on the clamping portion 310. Through the cooperation between the fourth guide surface 212 and the second guide surface 312, a guide is provided for the clamping portion 310 to enter the slot 201, ensuring that the clamping portion 310 smoothly enters the slot 201, realizing the clamping of the clamping portion 310 and the slot 201, thereby improving the assembly efficiency. In addition, the fourth guide surface 212 with a smooth transition can avoid damaging the clamping portion 310, thereby ensuring product quality.

[0058] In one embodiment, the number of elastic ribs 210 is two, and the lower plastic part 2 is provided with an elastic rib 210 at each end along the length direction thereof; the number of clamping parts 310 is two, and the end plate 3 is provided with a clamping part 310 at each end along the length direction thereof, and the two clamping parts 310 correspond to the two elastic ribs 210 one by one. Figure 6 The "length direction" indicated by the arrow in the middle refers to the length direction of the end plate 3. Fig.11 The "length direction" indicated by the arrow in the middle is Figure 1 The "length direction" indicated by the middle arrow is in the same direction. By providing an elastic rib 210 at each end of the length direction of the lower plastic part 2, and providing a clamping portion 310 corresponding to the elastic rib 210 at each end of the length direction of the end plate 3, each clamping portion 310 is clamped with the clamping groove 201 on the corresponding elastic rib 210, so that the end plate 3 and the lower plastic part 2 are clamped through two sets of buckle structures, thereby improving the stability of the clamping of the end plate 3 and the lower plastic part 2, further improving the stability of the cover plate assembly, effectively limiting the shaking of the end plate 3 in the battery housing, protecting the tab from being torn, and the clamping structures at both ends are not only convenient for processing but also convenient for assembly.

[0059] In addition, in other embodiments, an elastic rib 210 may be provided on both sides of the lower plastic part 2 along its width direction, and a clamping portion 310 may be provided on the supporting walls 302 on both sides of the end plate 3 along its width direction. Similarly, the clamping of the end plate 3 and the lower plastic part 2 may be achieved through two sets of clamping structures. It is understood that, as an alternative implementation, a clamping portion 310 may be provided on the inner supporting wall located in the middle of the end plate 3, and an elastic rib 210 may be provided at a corresponding position on the lower plastic part 2, so as to increase the number of clamping structures and further improve the stability of the clamping of the end plate 3 and the lower plastic part 2. The width direction of the lower plastic part 2 refers to Figure 6 The "width direction" indicated by the arrow in the middle refers to the width direction of the end plate 3. Fig.11 The "width direction" indicated by the arrow in the middle is Figure 1 The “width direction” indicated by the arrow in the middle is in the same direction.

[0060] In one embodiment, the elastic rib 210 is formed by extending a portion of the lower plastic body 220 toward the end plate 3 . The lower plastic body 2 and the end plate 3 are integrally formed, and the structure is stable and easy to process.

[0061] In one embodiment, a through hole 230 is opened at the position where the elastic rib 210 is set on the lower plastic body 220. The through hole 230 is a square hole. The root of the elastic rib 210 is connected to the inner wall of the through hole 230. The through hole 230 can provide space for the elastic deformation of the elastic rib 210 and facilitate the molding of the elastic rib 210.

[0062] In one embodiment, further combining Figure 6 and Fig.11 As shown, the dimension of the clamping portion 310 along the width direction of the end plate 3 is L1, and the dimension of the clamping slot 201 along the width direction of the lower plastic part 2 is L2, wherein L2-L1≥1mm. It should be noted that when the clamping portion 310 is inserted into the clamping slot 201, the width dimension L2 of the clamping slot 201 needs to be greater than the width dimension L1 of the clamping portion 310 to ensure that the clamping portion 310 can enter the clamping slot 201. If L2-L1 is less than 1mm, the dimension of the clamping slot 201 that is larger than the clamping portion 310 is too small, which is not conducive to the smooth insertion of the clamping portion 310 into the clamping slot 201, and increases the difficulty of assembly. Therefore, by setting the width dimension L2 of the clamping slot 201 to be greater than the width dimension L1 of the clamping portion 310 and the difference between the two is greater than or equal to 1mm, it can be ensured that the clamping portion 310 can be smoothly inserted into the clamping slot 201, reducing the difficulty of assembly and improving assembly efficiency. Specifically, along the width direction, the clamping portion 310 is located in the center of the clamping slot 201 , and the two sides of the clamping portion 310 along the width direction are at least 0.5 mm away from the inner wall of the clamping slot 201 .

[0063] In one embodiment, the dimension L1 of the clamping portion 310 along the width direction of the end plate 3 is in the range of 3 mm to 10 mm. If the dimension L1 of the clamping portion 310 along the width direction is less than 3 mm, the width of the clamping portion 310 is too small, the strength of the clamping portion 310 is poor, and the stability of the clamping portion 310 after being clamped with the clamping slot 201 is poor; if the dimension L1 of the clamping portion 310 along the width direction is greater than 10 mm, the width of the clamping portion 310 is large, which is not conducive to the cooperation with the clamping slot 201, and increases the difficulty of assembly. Therefore, by setting the dimension L1 of the clamping portion 310 along the width direction of the end plate 3 within the range of 3mm-10mm, it can be ensured that the clamping portion 310 has sufficient strength and the stability of the clamping portion 310 after being clamped with the clamping slot 201, thereby ensuring the relative fixation of the end plate 3 and the lower plastic part 2, avoiding the end plate 3 from shaking in the shell, and protecting the pole ear from damage; it can also ensure the smooth assembly of the clamping portion 310 and the clamping slot 201, thereby improving the assembly efficiency.

[0064] In this embodiment, the end plate 3 is connected to both ends of the lower plastic part 2 by a snap-fit ​​structure to achieve the positioning of the end plate 3 and the lower plastic part 2, limit the shaking of the end plate 3 in the battery housing, thereby avoiding the end plate 3 from tearing the pole ear and protecting the pole ear.

[0065] According to an embodiment of the utility model, on the other hand, a battery is provided, comprising: a shell, a pole group and the above-mentioned cover plate assembly. The shell has an open end; the pole group is placed in the shell; the above-mentioned cover plate assembly, the cover plate assembly is arranged at the open end of the shell, the cover plate body 1 is welded to the shell to close the shell, the lower plastic part 2 is located on the side of the cover plate body 1 facing the inside of the shell, and the end plate 3 is located between the lower plastic part 2 and the pole group.

[0066] In one embodiment, the battery is a lithium-ion battery, which has high energy density, long service life, high rated voltage, high power tolerance, low self-discharge, high charging efficiency, wide operating temperature range, high average output voltage, high output power, fast charging and discharging, etc., and is widely used in various fields such as power, energy storage, smart home, etc. Preferably, the battery is a lithium-ion blade battery.

[0067] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized in that: include: Cover plate body; A lower plastic part is arranged on one side of the cover body, and the lower plastic part abuts against and is relatively fixed to the cover body; The end plate is arranged on a side of the lower plastic part away from the cover plate body and abuts against the lower plastic part. A card slot is fixedly provided on one of the end plate and the lower plastic part and a card connection portion is fixedly provided on the other. The card connection portion is arranged corresponding to the card slot and the card connection portion is carded with the card slot.

2. The cover plate assembly according to claim 1, characterized in that: An elastic rib protruding toward the other is arranged on the surface of one of the end plate and the lower plastic part, and the clamping groove is constructed on the elastic rib.

3. The cover plate assembly according to claim 2, characterized in that: The elastic rib is arranged on the surface of the lower plastic part facing the end plate, the end plate includes a bottom plate and a support wall protruding from the bottom plate surface, the support wall is abutted against the lower plastic part at one end away from the bottom plate, the support wall is provided with the clamping portion, the clamping portion protrudes from the wall surface of the support wall, and the elastic rib is located on the side of the support wall having the clamping portion.

4. The cover plate assembly according to claim 3, characterized in that: The card slot is a through slot, and the clamping portion passes through the card slot; The edge of the clamping portion close to the lower plastic part body is chamfered to form a first guide surface, which is suitable for providing guidance for the assembly of the end plate and the lower plastic part; and / or, the edge of the clamping portion away from the lower plastic part body is chamfered to form a second guide surface, which is suitable for providing guidance for the clamping portion to enter the clamping groove.

5. The cover plate assembly according to claim 4, characterized in that: The elastic rib comprises two first connecting sections and a second connecting section connecting the two first connecting sections, one end of the first connecting section is connected to the lower plastic part body, and the second connecting section is connected to an end of the second connecting section away from the lower plastic part body; The edge of the second connecting section away from the lower plastic part body and close to the root of the clamping part is chamfered to form a third guide surface, and the third guide surface is suitable for providing guidance for the assembly of the end plate and the lower plastic part; and / or, the edge of the second connecting section close to the lower plastic part body and close to the root of the clamping part is rounded to form a fourth guide surface, and the fourth guide surface is suitable for providing guidance for the clamping part to enter the clamping groove.

6. The cover plate assembly according to claim 5, characterized in that: The dimension of the third guide surface along the length direction of the lower plastic part is W1, and the dimension of the third guide surface along the height direction of the lower plastic part is W2, wherein W1≥W2.

7. The cover plate assembly according to any one of claims 2 to 6, characterized in that: The number of the elastic ribs is two, and the lower plastic part is provided with one elastic rib at each end along its length direction; the number of the clamping parts is two, and the end plate is provided with one clamping part at each end along its length direction, and the two clamping parts correspond one to one with the two elastic ribs.

8. The cover plate assembly according to claim 7, characterized in that: The dimension of the clamping portion along the width direction of the end plate is L1, and the dimension of the clamping groove along the width direction of the lower plastic part is L2, wherein L2-L1≥1mm.

9. The cover plate assembly according to claim 8, characterized in that: The dimension L1 of the clamping portion along the width direction of the end plate ranges from 3 mm to 10 mm.

10. A battery, characterized in that: include: a housing having an open end; A pole group is placed in the housing; The cover plate assembly according to any one of claims 1 to 9, wherein the cover plate assembly is arranged at the open end of the shell, the cover plate body is welded to the shell to close the shell, the lower plastic part is located on the side of the cover plate body facing the inside of the shell, and the end plate is located between the lower plastic part and the pole group.

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