Cover plate structure and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate structure and a battery, the cover plate structure comprises: a post terminal module, which comprises a post terminal body and a fixing ring, the post terminal body is hollow and forms an accommodating cavity, and one end of the fixing ring is arranged in the accommodating cavity; the outer wall of the fixing ring and the inner wall of the pole body are arranged at intervals and form a filling gap, and the filling gap is filled with a first plastic part through injection molding; the cover plate body is welded with the fixing ring; a second plastic part is arranged between the cover plate body and the pole body; the sealing ring is arranged between the cover plate body and the pole body, and the sealing ring is suitable for sealing between the fixing ring and the cover plate body and between the fixing ring and the pole body. The cover plate structure provided by the utility model can realize good sealing.

Description

Technical Field

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

[0002] Lithium-ion batteries are widely used in electric vehicles, energy storage systems, and portable electronic devices due to their high energy density, long cycle life, and low self-discharge rate. However, existing lithium-ion battery covers have difficulty achieving good sealing. Utility Model Content

[0003] In view of this, the present invention provides a cover plate structure and a battery to solve the problem that it is difficult to achieve good sealing of the existing lithium ion battery cover plate.

[0004] In a first aspect, the present invention provides a cover plate structure, comprising:

[0005] The pole module includes a pole body and a fixing ring. The pole body is hollow and forms an accommodating cavity. One end of the fixing ring is built into the accommodating cavity. The outer wall of the fixing ring and the inner wall of the pole body are spaced apart to form a filling gap. The filling gap is suitable for injection molding to form a first plastic part.

[0006] The cover plate body is welded to the fixing ring;

[0007] A second plastic part is provided between the cover body and the pole body;

[0008] The sealing ring is arranged between the cover body and the pole body, and is suitable for sealing between the fixing ring and the cover body and the pole body.

[0009] Beneficial effects: The cover structure provided by the present invention forms a first plastic part by injection molding in the filling gap between the fixing ring and the pole body, thereby integrating the pole body, the fixing ring and the first plastic part into a pole module with an integral structure, realizing standardized module production, making it easier to control process quality and dimensional accuracy, and then assembling the pole module as a whole with the cover body, reducing the complexity of assembly, thereby improving the assembly accuracy of the cover structure; during the assembly process of the pole module as a whole with the cover body, a second plastic part is provided between the pole body and the cover body for insulation, and when the cover body is welded to the fixing ring, the sealing ring is squeezed by the cover body and the pole body, thereby blocking the first leakage path S1 and the second leakage path S2 through the sealing ring, so that the sealing ring can achieve effective sealing.

[0010] In an optional embodiment, the cover plate body includes a first step portion, the first step portion is provided with a mounting hole along the thickness direction, and the mounting hole is suitable for mounting a fixing ring; the sealing ring is provided between the first step portion and the pole body;

[0011] The first step portion is recessed toward one side of the pole body along the thickness direction to form a first mounting groove; the sealing ring is installed in the first mounting groove;

[0012] And / or, a second installation groove is formed on one side of the pole body toward the cover body along the thickness direction; and the sealing ring is installed in the second installation groove.

[0013] Beneficial effect: By installing the fixing ring in the mounting hole, installing the sealing ring in the first mounting groove and / or the second mounting groove, and then welding the cover body to the fixing ring, not only can the sealing ring block the first leakage path S1 and the second leakage path S2 to achieve effective sealing, but also the assembly quality can be improved.

[0014] In an optional embodiment, the pole body includes a first end plate portion, a side plate portion formed by a circumferential edge of the first end plate portion extending in a thickness direction away from the first end plate portion, and a second end plate portion formed by an end of the side plate portion extending radially toward the central axis of the pole body. The first end plate portion, the side plate portion and the second end plate portion are suitable for jointly enclosing a accommodating cavity; the second end plate portion encloses a through hole along a side radially away from the side plate portion.

[0015] Beneficial effect: One end of the fixing ring is installed in the accommodating cavity, and the other end of the fixing ring extends out of the through hole along the thickness direction, and then the first plastic part is formed by injection molding in the filling gap between the fixing ring and the pole body, thereby integrating the fixing ring, the pole body and the first plastic part into an integral structural module.

[0016] In an optional embodiment, the fixing ring includes a first clamping platform and a second clamping platform, the first clamping platform is arranged between the first end plate portion and the second end plate portion, the second clamping platform extends from the through hole along the thickness direction from one side of the first clamping platform, the second clamping platform is built into the mounting hole, and the side of the second clamping platform away from the first clamping platform is suitable for welding with the cover body.

[0017] Beneficial effects: The first end plate and the second end plate can limit the first clamping platform along the thickness direction, the side plate can limit the first clamping platform radially, and the second end plate can limit the second clamping platform radially, thereby ensuring the structural stability of the pole module.

[0018] In an optional embodiment, the thickness of the first end plate portion is T1, and T1 satisfies T1 ≥ 1.5 mm.

[0019] Beneficial effect: It is avoided that the first end plate portion is welded through during the welding process between the first end plate portion and the bar piece.

[0020] In an optional embodiment, a first gap is formed between the inner peripheral wall of the side plate portion and the outer peripheral wall of the first and second clamping platforms, and between the second end plate portion and the first clamping platform on one side facing the first end plate portion in the thickness direction, and the first gap is injection molded to form a first plastic part.

[0021] Beneficial effect: By forming the first plastic part by injection molding in the first gap, the pole body, the fixing ring and the first plastic part are integrated into a standardized pole module, which not only makes it easier to control the process quality and dimensional accuracy, but also reduces the complexity of assembly, which is conducive to improving production efficiency.

[0022] In an optional embodiment, the first end plate portion is spaced apart from the first fixture along a thickness direction toward a side of the second end plate portion to form a second gap, and the second gap is filled with injection molding to form the first plastic part.

[0023] Beneficial effect: During the injection molding filling process, the first plastic part is formed simultaneously in the first gap and the second gap, which, on the one hand, avoids arcing between the first end plate and the first card platform, preventing short circuit and thermal runaway inside the battery; on the other hand, it avoids the electrolyte from penetrating into the assembly gap between the first end plate and the first card platform, preventing the battery from self-discharging and extending the cycle life of the battery.

[0024] In an optional embodiment, the second plastic part includes a first connecting portion and a second connecting portion, the first connecting portion is arranged between the second end plate portion and the first step portion, the second connecting portion is arranged at an angle to the first connecting portion, and the second connecting portion is circumferentially arranged around the outer peripheral wall of the side plate portion;

[0025] The sealing ring is compressed between the second end plate portion and the first step portion, and is arranged on a side of the first connecting portion that is radially close to the central axis of the pole body.

[0026] Beneficial effect: The sealing ring is compressed between the second end plate and the first step portion, and the sealing ring is arranged on the side of the first connecting portion radially close to the central axis of the pole body, so that the first leakage path S1 and the second leakage path S2 are blocked by the sealing ring, so that the sealing ring can achieve effective sealing.

[0027] In an optional embodiment, the cover plate body also includes a second step portion, which is arranged on the side of the first step portion away from the pole body along the thickness direction. The second step portion is circumferentially arranged around the outer peripheral wall of the second clamping platform, and the second step portion is suitable for welding with the second clamping platform.

[0028] Beneficial effect: By extending the second step portion on the side of the first step portion away from the pole body in the thickness direction, not only the rigidity of the cover body can be enhanced and the deformation resistance of the cover body can be improved, but also by welding the second step portion to the second clamping platform, sufficient weld penetration between the cover body and the fixing ring is ensured, thereby ensuring the welding strength and yield between the cover body and the fixing ring, and effectively avoiding the fixing ring from falling off.

[0029] In an optional embodiment, the distance between the second step portion and the second end plate portion in the thickness direction away from the side of the pole body is h, and h satisfies h=t1+t2+Δt, wherein t1 is the thickness of the second plastic part, t2 is the total thickness of the second step portion and the first step portion, and the absolute value of Δt is less than or equal to 0.5 mm.

[0030] Beneficial effect: h satisfies h=t1+t2+△t, the absolute value of △t is less than or equal to 0.5mm, and t1, t2 and h form an open dimensional chain, thereby absorbing dimensional errors in the manufacturing process. Even if the manufacturing precision of the cover body and the second plastic part is low, the single sealing ring can achieve a good sealing effect, ensuring that the sealing ring can block the first leakage path S1 and the second leakage path S2, so that the sealing ring can achieve effective sealing.

[0031] In an optional embodiment, the cover structure also includes a third plastic part, which is arranged on a side of the cover body away from the pole body along the thickness direction. The third plastic part is recessed toward the side of the cover body to form an avoidance groove, and the avoidance groove is suitable for accommodating the second step portion and the second clamping platform.

[0032] Beneficial effect: During the assembly process, the second step portion and the second clamping platform are built into the avoidance groove, which is beneficial to reducing the space occupied by the cover structure inside the battery and improving the volume energy density of the battery.

[0033] In a second aspect, the present invention further provides a battery, comprising: a battery body, and the cover structure as described above.

[0034] Advantageous effects: The battery of the second aspect includes the cover plate structure of the first aspect. Therefore, the battery of the second aspect includes all the advantageous effects of the cover plate structure of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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 any creative work.

[0036] Figure 1 This is an assembly diagram of the first cover plate structure according to an embodiment of the present utility model;

[0037] Figure 2 for Figure 1 A partial enlarged schematic diagram of point A in the middle;

[0038] Figure 3 This is an assembly diagram of the first pole module according to an embodiment of the present utility model;

[0039] Figure 4 This is an assembly diagram of a second pole module according to an embodiment of the present utility model;

[0040] Figure 5 This is an assembly diagram of a pole body and a fixing ring of a pole module according to an embodiment of the present utility model;

[0041] Figure 6 This is a cross-sectional view of a pole body of a pole module according to an embodiment of the present utility model;

[0042] Figure 7 for Figure 2 A cross-sectional view of the cover body shown in ;

[0043] Figure 8 for Figure 1 A partial enlarged schematic diagram of point B in the middle;

[0044] Figure 9 for Figure 2 A partial enlarged schematic diagram of point C in the middle;

[0045] Figure 10 This is an exploded view of the first cover plate structure according to an embodiment of the present utility model;

[0046] Figure 11 This is a partially enlarged schematic diagram of the second cover plate structure according to an embodiment of the present utility model;

[0047] Figure 12 This is a partially enlarged schematic diagram of a third cover plate structure according to an embodiment of the present utility model;

[0048] Figure 13 for Figure 12 A partial enlarged schematic diagram of point D in the middle;

[0049] Figure 14 This is a partially enlarged schematic diagram of a fourth cover plate structure according to an embodiment of the present utility model;

[0050] Figure 15 for Figure 14 A partial enlarged schematic diagram of point E in the middle.

[0051] Description of reference numerals:

[0052] 10. Pole module; 100. Filling gap; 101. First gap; 102. Second gap; 11. Pole body; 1101. Accommodating cavity; 1102. Through hole; 1103. Second mounting slot; 111. First end plate; 112. Side plate; 113. Second end plate; 12. Fixing ring; 121. First fixture; 122. Second fixture; 13. First plastic part;

[0053] 20. Cover plate body; 201. Mounting hole; 202. First mounting slot; 21. First step portion; 22. Second step portion;

[0054] 30. Sealing ring;

[0055] 40. Second plastic part; 41. First connecting portion; 42. Second connecting portion;

[0056] 50. The third plastic part; 501. The avoidance groove. DETAILED DESCRIPTION

[0057] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0058] The following combination Figures 1 to 15 , describing the embodiments of the present utility model.

[0059] According to an embodiment of the present invention, on the one hand, a cover plate structure is provided, comprising:

[0060] Pole module 10, see Figure 3 As shown, the pole module 10 includes a pole body 11 and a fixing ring 12. Figure 6 As shown, the interior of the pole body 11 is hollow and forms an accommodating cavity 1101, and one end of the fixing ring 12 is built into the accommodating cavity 1101; the outer wall of the fixing ring 12 is spaced apart from the inner wall of the pole body 11 to form a filling gap 100, and the filling gap 100 is suitable for injection molding to form the first plastic part 13;

[0061] The cover body 20 is welded to the fixing ring 12; a second plastic part 40 is provided between the cover body 20 and the pole body 11;

[0062] The sealing ring 30 is disposed between the cover body 20 and the pole body 11 . The sealing ring 30 is suitable for sealing between the fixing ring 12 , the cover body 20 and the pole body 11 .

[0063] It should be noted that the material of the fixing ring 12 is the same as that of the cover body 20, and the cover body 20 can be made of aluminum; see Figure 1 As shown, the cover structure includes a positive pole module 10 and a negative pole module 10, see Figure 2 As shown, the positive pole body 11 can be made of aluminum, see Figure 8 As shown, the negative electrode post body 11 can be made of a copper-aluminum composite material. For the positive electrode post module 10, the first plastic part 13 and the second plastic part 40 can both be made of a weakly conductive material, or one of the first plastic part 13 and the second plastic part 40 can be made of a weakly conductive material and the other of an insulating material. For the negative electrode post module 10, the first plastic part 13 and the second plastic part 40 can both be made of an insulating material.

[0064] by Figure 8 For example, during the process of injection molding and filling the first plastic part 13 between the fixing ring 12 and the pole body 11, injection pores are easily generated, thereby forming a first leakage path S1; during the welding process between the cover body 20 and the fixing ring 12, weld pores are easily generated, thereby forming a second leakage path S2; by arranging a sealing ring 30 between the cover body 20 and the pole body 11, the sealing ring 30 is compressed between the cover body 20 and the pole body 11, thereby blocking the first leakage path S1 and the second leakage path S2 through the sealing ring 30, thereby achieving a good sealing effect.

[0065] The cover structure provided by the present invention forms a first plastic part 13 by injection molding in the filling gap 100 between the fixing ring 12 and the pole body 11, thereby integrating the pole body 11, the fixing ring 12 and the first plastic part 13 into a pole module 10 with an integral structure, realizing standardized module production, making it easier to control process quality and dimensional accuracy, and then assembling the pole module 10 as a whole with the cover body 20, reducing the complexity of assembly and thus improving the assembly accuracy of the cover structure; during the assembly process of the pole module 10 as a whole with the cover body 20, a second plastic part 40 is provided between the pole body 11 and the cover body 20 for insulation, and when the cover body 20 is welded to the fixing ring 12, the sealing ring 30 is squeezed by the cover body 20 and the pole body 11, thereby blocking the first leakage path S1 and the second leakage path S2 through the sealing ring 30, so that the sealing ring 30 can achieve effective sealing.

[0066] In some embodiments, the cover body 20 includes a first step portion 21 , the first step portion 21 is provided with a mounting hole 201 along the thickness direction, and the mounting hole 201 is suitable for mounting the fixing ring 12 ; the sealing ring 30 is disposed between the first step portion 21 and the pole body 11 ;

[0067] The first step portion 21 is recessed along the thickness direction toward one side of the pole body 11 to form a first mounting groove 202 ; the sealing ring 30 is installed in the first mounting groove 202 ;

[0068] And / or, a second installation groove 1103 is formed on one side of the pole body 11 facing the cover body 20 along the thickness direction; and the sealing ring 30 is installed in the second installation groove 1103 .

[0069] Please note that, see Figure 11 As shown, the sealing ring 30 can be directly compressed between the cover body 20 and the pole body 11 to achieve effective sealing. Figure 2 and Figure 7 As shown, the first step portion 21 can be recessed along the thickness direction toward one side of the pole body 11 to form a first installation groove 202, and the sealing ring 30 is installed in the first installation groove 202, which is conducive to positioning the sealing ring 30. The sealing ring 30 is squeezed by the first step portion 21 and the pole body 11, thereby achieving effective sealing and improving the assembly quality. Please combine Figure 12 and Figure 13 As shown, a second mounting groove 1103 can also be formed on one side of the pole body 11 toward the cover body 20 along the thickness direction, and the sealing ring 30 is installed in the second mounting groove 1103, which provides precise positioning for the sealing ring 30. At the same time, the sealing ring 30 is squeezed by the cover body 20 and the pole body 11, thereby achieving effective sealing and improving the assembly quality. Please combine Figure 14 and Figure 15 As shown, the sealing ring 30 can also be installed in the first installation groove 202 and the second installation groove 1103 at the same time, so as to accurately position the sealing ring 30 and avoid the sealing ring 30 from being offset, thereby achieving effective sealing and further improving the assembly quality.

[0070] By installing the fixing ring 12 in the mounting hole 201, installing the sealing ring 30 in the first mounting groove 202 and / or the second mounting groove 1103, and then welding the cover body 20 to the fixing ring 12, not only can the sealing ring 30 block the first leakage path S1 and the second leakage path S2 to achieve effective sealing, but also the assembly quality can be improved.

[0071] In some embodiments, see Figure 6As shown, the pole body 11 includes a first end plate portion 111, a side plate portion 112 formed by a circumferential edge of the first end plate portion 111 extending away from the first end plate portion 111 in the thickness direction, and a second end plate portion 113 formed by an end of the side plate portion 112 extending radially toward the central axis of the pole body 11. The first end plate portion 111, the side plate portion 112, and the second end plate portion 113 are suitable for jointly enclosing a receiving cavity 1101; the second end plate portion 113 encloses a through hole 1102 along a side radially away from the side plate portion 112, and then one end of the fixing ring 12 is installed in the receiving cavity 1101, and the other end of the fixing ring 12 extends out of the through hole 1102 in the thickness direction. Then, the first plastic part 13 is injection-molded into the filling gap 100 between the fixing ring 12 and the pole body 11, thereby integrating the fixing ring 12, the pole body 11, and the first plastic part 13 into an integral structural module.

[0072] In some embodiments, please combine Figure 3 As shown, the fixing ring 12 includes a first clamping platform 121 and a second clamping platform 122. The first clamping platform 121 is arranged between the first end plate portion 111 and the second end plate portion 113. The second clamping platform 122 extends from the through hole 1102 along the thickness direction from one side of the first clamping platform 121. The second clamping platform 122 is built into the mounting hole 201. The side of the second clamping platform 122 away from the first clamping platform 121 is suitable for welding with the cover body 20.

[0073] A first plastic part 13 is formed by injection molding in the filling gap 100 between the fixing ring 12 and the pole body 11, so that the pole body 11 and the fixing ring 12 are connected by the first plastic part 13 to form a pole module 10 with an integral structure; at the same time, the pole body 11 and the fixing ring 12 are matched by adopting the above-mentioned structure, and the first end plate portion 111 and the second end plate portion 113 can limit the first clamping platform 121 along the thickness direction, the side plate portion 112 can radially limit the first clamping platform 121, and the second end plate portion 113 can radially limit the second clamping platform 122, thereby ensuring the structural stability of the pole module 10.

[0074] Furthermore, the first end plate portion 111 , the side plate portion 112 and the second end plate portion 113 may be formed by bending and stretching the mother plate of the pole body 11 .

[0075] In some embodiments, see Figure 2 As shown, the thickness of the first end plate portion 111 is T1, and T1 satisfies T1 ≥ 1.5 mm.

[0076] If the first end plate 111 is too thin, the first end plate 111 may be easily penetrated during welding between the first end plate 111 and the tab. Therefore, the thickness T1 of the first end plate 111 must satisfy T1 ≥ 1.5 mm.

[0077] Furthermore, the thickness of the first end plate portion 111 is greater than or equal to the thickness of the side plate portion 112 , and the thickness of the side plate portion 112 is greater than or equal to the thickness of the second end plate portion 113 .

[0078] In some embodiments, see Figure 5 As shown, the inner peripheral wall of the side plate portion 112 and the outer peripheral wall of the first clamping platform 121 and the second clamping platform 122, as well as the second end plate portion 113 along the thickness direction toward the side of the first end plate portion 111 and the first clamping platform 121 are spaced and form a first gap 101, please combine Figure 3 As shown, the first gap 101 is filled with injection molding to form a first plastic part 13 .

[0079] By injection molding the first gap 101 to form the first plastic part 13, the pole body 11, the fixing ring 12 and the first plastic part 13 are integrated into a standardized pole module 10. This not only makes it easier to control process quality and dimensional accuracy, but also reduces assembly complexity, which is conducive to improving production efficiency.

[0080] In some embodiments, see Figure 5 As shown, the first end plate portion 111 is spaced apart from the first clamping platform 121 along the thickness direction toward the side of the second end plate portion 113 to form a second gap 102. Figure 4 As shown, the second gap 102 is filled with injection molding to form a first plastic part 13 .

[0081] It should be noted that since there is an assembly gap between the side of the first end plate portion 111 facing the second end plate portion 113 along the thickness direction and the first card platform 121, on the one hand, during the operation of the battery, arcing is easily generated between the first end plate portion 111 and the first card platform 121, resulting in a short circuit and thermal runaway inside the battery. On the other hand, the electrolyte is easy to penetrate into the assembly gap between the first end plate portion 111 and the first card platform 121, causing the battery to self-discharge, which is not only easy to consume the stored electrical energy of the battery in the absence of external load, but also easy to accelerate battery aging and affect the battery's cycle life.

[0082] By spacing and forming the second gap 102 between the first end plate portion 111 and the first fixture 121 on one side thereof facing the second end plate portion 113 in the thickness direction, the first plastic part 13 is simultaneously formed in the first gap 101 and the second gap 102 during the injection molding process. This avoids arcing between the first end plate portion 111 and the first fixture 121, thereby preventing short circuits and thermal runaway inside the battery. Furthermore, it prevents electrolyte from penetrating into the assembly gap between the first end plate portion 111 and the first fixture 121, thereby preventing the battery from self-discharging and extending the cycle life of the battery.

[0083] In some embodiments, see Figure 2 As shown, the second plastic part 40 includes a first connecting portion 41 and a second connecting portion 42. The first connecting portion 41 is disposed between the second end plate portion 113 and the first step portion 21. The second connecting portion 42 is disposed at an angle to the first connecting portion 41. The second connecting portion 42 is circumferentially disposed around the outer peripheral wall of the side plate portion 112, thereby preventing the battery from short-circuiting due to contact between the terminal body 11 and the cover body 20.

[0084] The sealing ring 30 is compressed between the second end plate portion 113 and the first step portion 21. The sealing ring 30 is arranged on the side of the first connecting portion 41 radially close to the central axis of the pole body 11, so that the first leakage path S1 and the second leakage path S2 are blocked by the sealing ring 30, so that the sealing ring 30 can achieve effective sealing.

[0085] In some embodiments, see Figure 7 As shown, the cover body 20 also includes a second step portion 22, which is arranged on the side of the first step portion 21 away from the pole body 11 along the thickness direction. The second step portion 22 is formed by extending from the side of the first step portion 21 away from the pole body 11 along the thickness direction toward the direction away from the first step portion 21. Please combine Figure 2 and Figure 9 As shown, the second step portion 22 is circumferentially arranged around the outer peripheral wall of the second clamping platform 122 , and the second step portion 22 is suitable for welding with the second clamping platform 122 .

[0086] By extending the second step portion 22 on one side of the first step portion 21 away from the pole body 11 in the thickness direction, not only the rigidity of the cover body 20 can be enhanced and the deformation resistance of the cover body 20 can be improved, but also by welding the second step portion 22 to the second clamping platform 122, sufficient weld penetration between the cover body 20 and the fixing ring 12 is ensured, thereby ensuring the welding strength and yield between the cover body 20 and the fixing ring 12, and effectively preventing the fixing ring 12 from falling off.

[0087] In some embodiments, see Figure 2 As shown, the distance between the second step portion 22 and the second end plate portion 113 along the thickness direction away from the side of the pole body 11 is h, and h satisfies h=t1+t2+Δt, where t1 is the thickness of the second plastic part 40, t2 is the total thickness of the second step portion 22 and the first step portion 21, and the absolute value of Δt is less than or equal to 0.5 mm.

[0088] It should be noted that due to the manufacturing tolerances between the cover body 20 and the second plastic part 40, h satisfies h=t1+t2+△t, the absolute value of △t is less than or equal to 0.5 mm, and t1, t2 and h form an open dimensional chain, thereby absorbing the dimensional errors in the manufacturing process. Even if the manufacturing precision of the cover body 20 and the second plastic part 40 is low, the single sealing ring 30 can achieve a good sealing effect, ensuring that the sealing ring 30 can block the first leakage path S1 and the second leakage path S2, so that the sealing ring 30 can achieve effective sealing.

[0089] In some embodiments, see Figure 2 As shown, the cover structure also includes a third plastic part 50, which is arranged on the side of the cover body 20 away from the pole body 11 along the thickness direction. Figure 9 As shown, the third plastic component 50 is recessed on one side facing the cover body 20 to form an escape groove 501 . The escape groove 501 is suitable for accommodating the second step portion 22 and the second clamping platform 122 .

[0090] By forming an avoidance groove 501 by recessing one side of the third plastic part 50 toward the cover body 20, the second step portion 22 and the second clamping platform 122 are built into the avoidance groove 501 during the assembly process, which is beneficial to reducing the space occupied by the cover structure inside the battery and improving the volume energy density of the battery.

[0091] According to an embodiment of the present invention, on the other hand, a battery is provided, including: a battery body, and the cover plate structure as described above.

[0092] The battery in this embodiment includes the above-mentioned cover plate structure. Therefore, the battery in this embodiment includes all the beneficial effects of the above-mentioned cover plate structure.

[0093] Although the embodiments of the present invention have been described with reference to 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 shall fall within the scope defined by the appended claims.

Claims

1. A cover plate structure, characterized in that: include: A pole module (10) comprises a pole body (11) and a fixing ring (12); the pole body (11) is hollow inside and forms an accommodating cavity (1101); one end of the fixing ring (12) is built into the accommodating cavity (1101); the outer wall of the fixing ring (12) and the inner wall of the pole body (11) are spaced apart to form a filling gap (100); the filling gap (100) is suitable for injection molding to form a first plastic part (13); The cover plate body (20) is welded to the fixing ring (12); a second plastic part (40) is provided between the cover plate body (20) and the pole body (11); A sealing ring (30) is provided between the cover plate body (20) and the pole body (11), and the sealing ring (30) is suitable for sealing between the fixing ring (12), the cover plate body (20) and the pole body (11).

2. The cover plate structure according to claim 1, characterized in that: The cover plate body (20) comprises a first step portion (21), the first step portion (21) is provided with a mounting hole (201) along a thickness direction, and the mounting hole (201) is suitable for mounting the fixing ring (12); the sealing ring (30) is arranged between the first step portion (21) and the pole body (11); The first step portion (21) is recessed toward one side of the pole body (11) along the thickness direction to form a first installation groove (202); the sealing ring (30) is installed in the first installation groove (202); And / or, the pole body (11) is provided with a second installation groove (1103) on one side thereof facing the cover plate body (20) in the thickness direction; and the sealing ring (30) is installed in the second installation groove (1103).

3. The cover plate structure according to claim 2, characterized in that: The pole body (11) includes a first end plate portion (111), a side plate portion (112) formed by extending the circumferential edge of the first end plate portion (111) in the thickness direction in a direction away from the first end plate portion (111), and a second end plate portion (113) formed by extending the end of the side plate portion (112) away from the first end plate portion (111) in the radial direction in the direction of the central axis of the pole body (11), the first end plate portion (111), the side plate portion (112) and the second end plate portion (113) are suitable for jointly enclosing the accommodating cavity (1101); the second end plate portion (113) encloses a through hole (1102) in the radial direction away from the side plate portion (112).

4. The cover plate structure according to claim 3, characterized in that: The fixing ring (12) includes a first clamping platform (121) and a second clamping platform (122), wherein the first clamping platform (121) is arranged between the first end plate portion (111) and the second end plate portion (113), and the second clamping platform (122) extends from the through hole (1102) along the thickness direction from one side of the first clamping platform (121), and the second clamping platform (122) is built into the mounting hole (201), and the side of the second clamping platform (122) away from the first clamping platform (121) is suitable for welding with the cover plate body (20).

5. The cover plate structure according to claim 3, characterized in that: The thickness of the first end plate portion (111) is T1, and T1 satisfies T1≥1.5 mm.

6. The cover plate structure according to claim 4, characterized in that: A first gap (101) is formed between the inner peripheral wall of the side plate portion (112) and the outer peripheral walls of the first clamping platform (121) and the second clamping platform (122), and between the second end plate portion (113) and the first clamping platform (121) on one side thereof facing the first end plate portion (111) in the thickness direction. The first gap (101) is filled with injection molding to form the first plastic part (13).

7. The cover plate structure according to claim 4, characterized in that: The first end plate portion (111) is spaced apart from the first clamping platform (121) along the thickness direction on one side facing the second end plate portion (113) to form a second gap (102), and the second gap (102) is filled with injection molding to form the first plastic part (13).

8. The cover plate structure according to claim 4, 6 or 7, characterized in that: The second plastic part (40) includes a first connecting portion (41) and a second connecting portion (42), wherein the first connecting portion (41) is arranged between the second end plate portion (113) and the first step portion (21), the second connecting portion (42) is arranged at an angle to the first connecting portion (41), and the second connecting portion (42) is arranged circumferentially around the outer peripheral wall of the side plate portion (112); The sealing ring (30) is compressed between the second end plate portion (113) and the first step portion (21), and the sealing ring (30) is arranged on a side of the first connecting portion (41) radially close to the central axis of the pole body (11).

9. The cover plate structure according to claim 8, characterized in that: The cover plate body (20) further comprises a second step portion (22), the second step portion (22) being arranged on a side of the first step portion (21) away from the pole body (11) in the thickness direction, the second step portion (22) being circumferentially arranged around the outer peripheral wall of the second clamping platform (122), and the second step portion (22) being suitable for being welded to the second clamping platform (122).

10. The cover plate structure according to claim 9, characterized in that: The distance between the second step portion (22) and the second end plate portion (113) in the thickness direction, which is away from the side of the pole body (11), is h, and h satisfies h=t1+t2+Δt, wherein t1 is the thickness of the second plastic part (40), t2 is the total thickness of the second step portion (22) and the first step portion (21), and the absolute value of Δt is less than or equal to 0.5 mm.

11. The cover plate structure according to claim 9, characterized in that: The cover plate structure further comprises a third plastic part (50), the third plastic part (50) being arranged on a side of the cover plate body (20) away from the pole body (11) in the thickness direction, the third plastic part (50) being recessed toward a side of the cover plate body (20) to form an avoidance groove (501), the avoidance groove (501) being suitable for accommodating the second step portion (22) and the second clamping platform (122).

12. A battery, characterized in that: include: A battery body and a cover plate structure as claimed in any one of claims 1 to 11.

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