Cover assembly and battery

Abstract

The present invention relates to the field of battery technology, and discloses a cover plate assembly and a battery. The cover plate assembly includes: a cover plate, which is provided with a pole through hole and an annular groove, wherein the annular groove is formed by a depression of a part of the first surface of the cover plate, and the pole through hole is located in the area surrounded by the inner ring of the annular groove; a pole structure, which is passed through the pole through hole; an insulating ring, which is provided in the annular groove and is adapted to the annular groove; a first plastic part, which is provided between the pole structure and the first surface, wherein the bottom surface of the first plastic part abuts the first surface, and the outer contour of the positive projection of the bottom surface of the plastic part on the first surface is located between the inner ring and the outer ring of the annular groove; a top cover patch, which is attached to the first surface, and is provided with a first through hole, wherein the opening contour of the first through hole is larger than the outer contour of the bottom surface of the plastic part and smaller than the outer contour of the insulating ring. The spacing between the first through hole of the top cover patch and the first plastic part falls between the inner ring and the outer ring of the insulating ring to avoid short circuit between the cover plate and the pole structure.

Description

Technical Field

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

[0002] The battery primarily consists of a housing, a cover assembly, and a pole group. The pole group is placed in the housing's cavity, and the cover assembly covers the housing's open end. The cover assembly includes a cover plate, pole posts mounted on the cover plate, and a plastic component. The pole posts are electrically connected to the tabs on the pole group, and the plastic component is located between the cover plate and the pole posts to ensure insulation between the two. A top cover patch is attached to the side of the cover plate facing the outside of the housing. This top cover patch is made of insulating material to protect the cover plate.

[0003] In the prior art, due to manufacturing tolerances of the top cover patch and equipment alignment tolerances, there is a certain gap between the top cover patch and the upper plastic. The portion of the cover corresponding to this gap is exposed to the air. For batteries used in environments with large temperature swings between day and night, water droplets will condense on the battery's external surface. When the battery is exposed to such conditions for a long time, the condensed water droplets gradually accumulate. The water droplets accumulated on the outer surface of the plastic can connect the exposed portion of the cover plate to the surface of the terminal facing the outside of the housing, causing a short circuit between the terminal and the cover plate, posing a significant risk. Summary of the Invention

[0004] In view of this, the present invention provides a cover plate assembly and a battery to solve the problem of short circuit between the pole and the cover plate when the battery is used for a long time in an environment with a large temperature difference between day and night.

[0005] In the first aspect, the present invention provides a cover plate assembly, comprising: a cover plate, provided with a pole through hole and an annular groove, the annular groove being formed by a depression of a partial area on the first surface of the cover plate, and the pole through hole being located in the area surrounded by the inner ring of the annular groove; a pole structure passing through the pole through hole; an insulating ring, arranged in the annular groove and adapted to the annular groove; a first plastic part, arranged between the pole structure and the first surface, the bottom surface of the first plastic part abutting the first surface, and the outer contour of the positive projection of the bottom surface of the plastic part on the first surface being located between the inner ring and the outer ring of the annular groove; a top cover patch, attached to the first surface, the top cover patch being provided with a first through hole, the opening contour of the first through hole being larger than the outer contour of the bottom surface of the plastic part and smaller than the outer contour of the insulating ring.

[0006] Beneficial effect: By opening an annular groove on the first surface of the cover plate and embedding an insulating ring that is compatible with the annular groove in the annular groove, an insulating area is formed on the first surface of the cover plate in the area corresponding to the annular groove. By setting the positive projection of the outer contour of the bottom surface of the first plastic part on the first surface of the cover plate to be located between the inner ring and the outer ring of the annular groove, the outer contour of the bottom surface of the first plastic part falls on the insulating ring. At the same time, by setting the opening contour of the first through hole of the top cover patch to be larger than the outer contour of the bottom surface of the first plastic part and smaller than the outer contour of the insulating ring, the edge of the first through hole of the top cover patch also falls on the insulating ring, so that on the first surface, the distance between the edge of the first through hole of the top cover patch and the first plastic part falls between the inner ring and the outer ring of the insulating ring. The insulating ring increases the insulation between the first plastic part and the cover plate, avoiding the existence of an area on the cover plate close to the first plastic part that is not covered by the top cover patch, thereby avoiding the problem of water droplets condensed on the first plastic part connecting the cover plate and the pole structure, causing a short circuit between the cover plate and the pole structure, thereby improving the safety of the battery.

[0007] In an optional embodiment, the insulating ring is a paint layer.

[0008] Beneficial effects: The coating layer has a simple structure, is easy to process, has low cost and good insulation properties.

[0009] In an optional embodiment, the recessed depth of the annular groove along the thickness direction of the cover plate is T1, wherein 0.05 mm ≤ T1 ≤ 0.3 mm.

[0010] Beneficial effects: It can ensure the smooth forming of the annular groove and the insulation and reliability of the insulating ring, reduce the difficulty of spraying during the processing of the insulating ring, avoid material waste, and save costs.

[0011] In an optional embodiment, the annular groove has a width of W1, wherein 1.5 mm ≤ W1 ≤ 10 mm.

[0012] Beneficial effect: By setting the ring width W1 of the annular groove to a value between 1.5mm and 10mm, it can be ensured that the insulating ring located in the annular groove overlaps with both the first plastic part and the cover plate, thereby ensuring that the insulating ring can fill the gap between the top cover patch and the first plastic part, ensuring the insulation between the first plastic part and the cover plate, and can avoid paint falling into the shell cover welding area during the spraying process of the insulating ring, thereby ensuring the welding quality, and can reduce the risk of thermal warping of the outer ring edge of the insulating ring due to the influence of welding heat, thereby further ensuring that the insulating ring plays its insulating role and improves safety.

[0013] In an optional embodiment, on the first surface of the cover plate, the inner ring of the annular groove and the pole through hole are spaced apart and the shortest distance therebetween is W2, where W2 is ≥ 0.5 mm.

[0014] Beneficial effect: ensuring sufficient spacing between the annular groove and the pole through-hole, thereby preventing paint from entering the pole through-hole during the spraying process of the insulating ring, thereby ensuring the sealing of the cover assembly, avoiding internal short circuit of the battery, and ensuring the safety of the battery.

[0015] In an optional embodiment, an edge area of ​​the top cover patch close to the first through hole overlaps with an outer ring edge area of ​​the insulating ring to form a first overlapping ring, and a ring width of the first overlapping ring is L1, where L1 ≥ 1 mm.

[0016] Beneficial effect: It can ensure that the top cover patch and the insulating ring have sufficient overlap size, thereby avoiding the edge portion of the top cover patch near the first through hole from warping, thereby ensuring isolation between the cover plate and the first plastic part, and further avoiding the short circuit between the cover plate and the pole structure, thereby improving the safety of the battery.

[0017] In an optional embodiment, the outer edge area of ​​the bottom surface of the plastic part overlaps with the inner ring edge area of ​​the insulating ring to form a second overlapping ring, and the ring width of the second overlapping ring is L2, wherein L2 ≥ 0.5 mm.

[0018] Beneficial effect: It can ensure that the bottom surface of the first plastic part and the insulating ring have sufficient overlap size, thereby improving insulation, further avoiding the short circuit between the cover plate and the pole structure, and improving the safety and reliability of the battery.

[0019] In an optional embodiment, in the width direction of the cover plate, a vertical distance between the outer ring of the annular groove and the side edge of the cover plate is L0, wherein L0 ≥ 1.5 mm.

[0020] Beneficial effects: It can prevent paint from falling onto the shell cover welding area during the spraying process of the insulating ring, thereby ensuring the welding quality, and can reduce the risk of thermal warping of the outer ring edge of the insulating ring due to the influence of welding heat, thereby further ensuring that the insulating ring plays its insulating role and ensuring the safety of the battery.

[0021] In an optional embodiment, the first plastic part further includes an extended edge, which is extended from the outer edge of the bottom surface of the plastic part in a direction away from the cover plate, and a second through hole is provided on the bottom surface of the plastic part; the pole structure includes a pole and a rivet block, and the rivet block is located in a groove surrounded by the bottom surface of the first plastic part and the extended edge, and the pole passes through the pole through hole and the second through hole in sequence and is riveted to the rivet block.

[0022] Beneficial effect: By providing the first plastic part with a plastic part bottom surface and an extended edge connected to the outer edge of the plastic part bottom surface, the first plastic part as a whole is in the form of a groove, and by embedding the rivet block of the pole structure into the groove formed by the first plastic part, the bottom surface of the plastic part is located between the rivet block and the cover plate, and the extended edge surrounds the circumferential surface of the rivet block, further improving the insulation protection of the rivet block. While ensuring that the rivet block is electrically connected to the pole group inside the battery through the pole, the insulation between the rivet block and the cover plate is ensured, thereby improving the safety of the battery.

[0023] In a second aspect, the present invention further provides a battery comprising: a housing having an open end; an electrode group disposed within the housing, the electrode group having a tab; and the aforementioned cover plate assembly, disposed over the open end of the housing, the electrode post structure within the cover plate assembly being electrically connected to the tab of the electrode group. Because the battery includes the cover plate assembly, it has the same effects as the cover plate assembly and is not further described here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 This is an exploded schematic diagram of a cover plate assembly according to an embodiment of the present invention;

[0026] Figure 2 for Figure 1 The diagram shows the positional relationship of the components before the pole structure is riveted during the assembly of the cover assembly;

[0027] Figure 3 for Figure 1 The schematic diagram of the position relationship between the top cover patch and the cover plate before being attached during the assembly process of the cover plate assembly is shown;

[0028] Figure 4 This is a schematic structural diagram of an assembled cover plate assembly according to an embodiment of the present invention;

[0029] Figure 5 for Figure 4 A top view of the cover assembly is shown;

[0030] Figure 6 for Figure 5 Cross-sectional view in the AA direction;

[0031] Figure 7 for Figure 6A partial enlarged schematic diagram of center C;

[0032] Figure 8 for Figure 5 Cross-sectional view in the middle BB direction;

[0033] Figure 9 for Figure 8 A partial enlarged schematic diagram of D in the middle;

[0034] Figure 10 This is a structural schematic diagram of a cover plate according to an embodiment of the present invention;

[0035] Figure 11 for Figure 10 A partial enlarged schematic diagram of the cover shown.

[0036] Description of reference numerals:

[0037] 1. Cover plate; 101. Pole through hole; 102. Annular groove; 103. Explosion-proof valve hole; 110. First surface; 2. Pole structure; 201. Pole; 202. Riveted block; 3. Insulating ring; 4. First plastic part; 401. Bottom of plastic part; 402. Extended edge; 403. Second through hole; 5. Top cover patch; 501. First through hole; 502. Third through hole; 6. Sealing ring; 7. Second plastic part; 8. Explosion-proof valve; 801. Explosion-proof valve patch. DETAILED DESCRIPTION

[0038] 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments 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.

[0039] The following combination Figures 1 to 11 , describing embodiments of the present invention.

[0040] According to an embodiment of the present invention, on the one hand, a cover plate assembly is provided, including: a cover plate 1, a pole structure 2, an insulating ring 3, a first plastic part 4 and a top cover patch 5. The cover plate 1 is provided with a pole through hole 101 and an annular groove 102. The annular groove 102 is formed by a recessed portion of the first surface 110 of the cover plate 1. The pole through hole 101 is located in the area surrounded by the inner ring of the annular groove 102. The pole structure 2 is passed through the pole through hole 101. The insulating ring 3 is arranged in the annular groove 102 and is adapted to the annular groove 102. The first plastic part 4 is arranged between the pole structure 2 and the first surface 110. The bottom surface 401 of the first plastic part 4 abuts the first surface 110, and the outer contour of the positive projection of the bottom surface 401 of the plastic part on the first surface 110 is located between the inner ring and the outer ring of the annular groove 102. The top cover patch 5 is attached to the first surface 110. The top cover patch 5 is provided with a first through hole 501. The opening contour of the first through hole 501 is larger than the outer contour of the bottom surface 401 of the plastic part and smaller than the outer contour of the insulating ring 3.

[0041] The first surface 110 of the cover plate 1 refers to the Figure 1 and Figures 6 to 9 The surface in the direction of "up" indicated by the arrow in the middle; the annular groove 102 is formed by a downward depression of a portion of the first surface 110 of the cover plate 1. The first plastic part 4 is located on the first side of the cover plate 1, wherein the first side of the cover plate 1 refers to the side in the direction of the first surface 110 of the cover plate 1. The pole is connected along Figure 1 and Figures 6 to 9 The "up and down" direction indicated by the middle arrow passes through the cover plate 1. Specifically, when the cover plate assembly is assembled with the battery housing, the first surface 110 of the cover plate 1 is the surface facing the outside of the housing.

[0042] In the cover assembly of this embodiment, an annular groove 102 is formed on the first surface 110 of the cover 1, and an insulating ring 3 adapted to the annular groove 102 is embedded in the annular groove 102, so that an insulating area is formed in the area corresponding to the annular groove 102 on the first surface 110 of the cover 1. By setting the orthographic projection of the outer contour of the bottom surface 401 of the first plastic part 4 on the first surface 110 of the cover 1 between the inner ring and the outer ring of the annular groove 102, the outer contour of the bottom surface of the first plastic part 4 falls on the insulating ring 3. At the same time, by setting the opening contour of the first through hole 501 of the top cover patch 5 to be larger than the bottom surface 401 of the first plastic part 4, the outer contour of the bottom surface of the first plastic part 4 falls on the insulating ring 3. 1 and is smaller than the outer contour of the insulating ring 3, the edge of the first through hole 501 of the top cover patch 5 also falls on the insulating ring 3, so that on the first surface 110, the distance between the edge of the first through hole 501 of the top cover patch 5 and the first plastic part 4 falls between the inner ring and the outer ring of the insulating ring 3. The insulating ring 3 increases the insulation between the first plastic part 4 and the cover plate 1, avoiding the presence of an area on the cover plate 1 close to the first plastic part 4 that is not covered by the top cover patch 5, thereby avoiding the problem of water droplets condensed on the first plastic part 4 connecting the cover plate 1 and the pole structure 2 and causing a short circuit between the cover plate 1 and the pole structure 2, thereby improving the safety of the battery.

[0043] It should be noted that the insulating ring 3 is compatible with the annular groove 102 in the sense that the insulating ring 3 has the same shape and size as the annular groove 102, and the insulating ring 3 fits neatly into the annular groove 102. The orthographic projection of the annular groove 102 on the first surface 110 of the cover plate 1 is annular, and the inner and outer rings of the annular groove 102 refer to the inner and outer rings of the annular groove 102 as the orthographic projection of the annular groove 102 on the first surface 110 of the cover plate 1. The opening contour of the first through hole 501 is larger than the outer contour of the bottom surface 401 of the plastic part and smaller than the outer contour of the insulating ring 3 in the sense that the contour line of the orthographic projection of the first through hole 501 on the first surface 110 of the cover plate 1 is larger than the outer contour line of the orthographic projection of the bottom surface 401 of the plastic part on the first surface 110, and smaller than the outer contour line of the orthographic projection of the insulating ring 3 on the first surface 110.

[0044] In one embodiment, the insulating ring 3 is a coating layer, which has a simple structure, is easy to process, has low cost, and has good insulation properties.

[0045] Preferably, the coating layer is formed by spraying. Figure 2 As shown, before the top cover is riveted, that is, before the pole 201 of the pole structure 2 is riveted to the riveting block 202 , paint is sprayed on the annular groove 102 on the cover plate 1 to form an insulating ring 3 in the annular groove 102 .

[0046] In one embodiment, the depth of the annular groove 102 in the thickness direction of the cover plate 1 is T1, wherein 0.05 mm ≤ T1 ≤ 0.3 mm. Figure 1 and Figures 6 to 9 In the "up and down" direction indicated by the middle arrow, the depth of the annular groove 102 along the thickness direction of the cover plate 1 is the groove depth of the annular groove 102. It should be noted that, since the insulating ring 3 is formed by spraying, the groove depth of the annular groove 102 does not need to be too large. If T1 is greater than 0.3mm, the groove depth of the annular groove 102 is too large. Correspondingly, the thickness of the insulating ring 3 is too large, which increases the material used for spraying the insulating ring 3, increases the cost, and increases the difficulty of spraying. If T1 is less than 0.05mm, the groove depth of the annular groove 102 is too small, making it difficult to form. Correspondingly, the thickness of the insulating ring 3 is too small, and the insulation performance is poor. Therefore, by setting the depression depth T1 of the annular groove 102 along the thickness direction of the cover plate 1 to a value within the range of 0.05mm to 0.3mm, it is possible to ensure that the annular groove 102 is smoothly formed and the insulation and reliability of the insulating ring 3 are guaranteed, while reducing the difficulty of spraying during the processing of the insulating ring 3, avoiding material waste, and saving costs.

[0047] Preferably, the dimension of the insulating ring 3 along the thickness direction of the cover plate 1 is equal to the groove depth T1 of the annular groove 102 along the thickness direction of the cover plate 1, that is, the dimension of the insulating ring 3 along the vertical direction is equal to the groove depth of the annular groove 102 along the vertical direction, so that the insulating ring 3 is just filled in the annular groove 102, and the upper surface of the insulating ring 3 is flush with the first surface 110 of the cover plate 1. Figure 1 and Figures 6 to 9 The arrow in the middle points to the "up and down" direction; the upper surface refers to the direction along Figure 1 and Figures 6 to 9 The surface in the "up" direction indicated by the arrow in the middle.

[0048] In one embodiment, the ring width of the annular groove 102 is W1, wherein 1.5mm≤W1≤10mm. It should be noted that the ring width W1 of the annular groove 102 is equal to the ring width of the insulating ring 3. In order to ensure that the insulating ring 3 can overlap with a portion of the bottom surface 401 of the first plastic part 4 and a portion of the top cover patch 5 near the edge of the first through hole 501, it is necessary to ensure that the annular groove 102 has a certain ring width. If W1 is less than 1.5mm, the ring width of the annular groove 102 is too small, and it is difficult to ensure that the insulating ring 3 located in the annular groove 102 overlaps with both the first plastic part 4 and the cover plate 1, that is, the insulating ring 3 cannot fill the gap between the top cover patch 5 and the first plastic part. 4, making it difficult to ensure the insulation between the first plastic part 4 and the cover plate 1; if W1 is greater than 10mm, the width of the annular groove 102 is too large, and along the width direction, the outer ring of the annular groove 102 is too close to the edge of the cover plate 1, that is, the distance between the insulating ring 3 located in the annular groove 102 and the edge of the cover plate 1 is too small. During the spraying process of the insulating ring 3, part of the paint will fall into the shell cover welding area, and welding explosion points will appear during the welding process, affecting the welding quality. In addition, due to the influence of welding thermal deformation, the outer ring edge of the insulating ring 3 will have the risk of thermal warping. Therefore, by setting the ring width W1 of the annular groove 102 to a value between 1.5 mm and 10 mm, it can be ensured that the insulating ring 3 located in the annular groove 102 overlaps with both the first plastic part 4 and the cover plate 1, thereby ensuring that the insulating ring 3 can fill the gap between the top cover patch 5 and the first plastic part 4, ensuring the insulation between the first plastic part 4 and the cover plate 1, and can avoid paint falling into the shell cover welding area during the spraying process of the insulating ring 3, thereby ensuring the welding quality, and can reduce the risk of thermal warping of the outer ring edge of the insulating ring 3 due to the influence of welding heat, thereby further ensuring that the insulating ring 3 plays its insulating role and improves safety.

[0049] In one embodiment, on the first surface 110 of the cover plate 1, the inner ring of the annular groove 102 is spaced apart from the pole through-hole 101, and the shortest distance between the two is W2, where W2 is ≥ 0.5 mm. On the first surface 110 of the cover plate 1, the annular groove 102 is spaced apart from the pole through-hole 101, and the inner ring of the annular groove 102 is the portion of the annular groove 102 closest to the pole through-hole 101. If W2 is less than 0.5 mm, the distance between the inner ring of the annular groove 102 and the pole through-hole 101 is too small. During the process of spraying paint into the annular groove 102 to form the insulating ring 3, there is a risk that the sprayed paint will enter the interior of the pole through-hole 101, thereby introducing foreign matter into the interior of the cover plate assembly, affecting the sealing, and even causing a battery short circuit, which is highly dangerous. Therefore, by setting the shortest distance W2 between the inner ring of the annular groove 102 and the pole through hole 101 to be greater than or equal to 0.5 mm, it is ensured that there is sufficient spacing between the annular groove 102 and the pole through hole 101, thereby preventing paint from entering the pole through hole 101 during the spraying process of the insulating ring 3, thereby ensuring the sealing of the cover assembly, avoiding internal short circuit of the battery, and ensuring the safety of the battery.

[0050] It should be noted that further combining Figure 11 As shown, the cover plate 1 is provided with two pole through holes 101, and both pole through holes 101 are located in the area surrounded by the inner ring of the annular groove 102. The pole through holes 101 are circular holes, and the annular groove 102 is a square ring. The shortest distance between the inner ring of the annular groove 102 and the pole through holes 101 is located on the long side or short side of the inner ring of the annular groove 102. Among them, the long side of the inner ring of the annular groove 102 refers to the side of the inner ring of the square ring extending along the length direction of the cover plate 1, and the short side refers to the side of the inner ring of the square ring extending along the width direction of the cover plate 1; the length direction refers to Figures 10 and 11 The arrow in the middle refers to the "length direction", and the width direction refers to Figures 8 to 11 The arrow in the middle points to the "width direction".

[0051] In one embodiment, further combined Figure 9As shown, the edge area of ​​the top cover patch 5 near the first through hole 501 overlaps the outer ring edge area of ​​the insulating ring 3 to form a first lap ring. The ring width of the first lap ring is L1, where L1 is ≥ 1mm. The first lap ring is the overlapping portion of the top cover patch 5 and the insulating ring 3. If L1 is less than 1mm, the ring width of the first lap ring is too narrow, and the overlapping portion of the top cover patch 5 and the insulating ring 3 is too small. The edge portion of the top cover patch 5 near the first through hole 501 is prone to warping, resulting in the portion of the first surface 110 of the cover plate 1 near the insulating ring 3 being exposed. There is still a risk of short circuit between the cover plate 1 and the pole structure 2 due to accumulated water droplets. Therefore, by setting the ring width L1 of the first overlapping ring formed by overlapping the edge area of ​​the top cover patch 5 near the first through hole 501 and the outer ring edge area of ​​the insulating ring 3 to be greater than or equal to 1 mm, it can be ensured that the top cover patch 5 and the insulating ring 3 have sufficient overlapping dimensions, thereby avoiding the edge part of the top cover patch 5 near the first through hole 501 from warping, thereby ensuring the isolation between the cover plate 1 and the first plastic part 4, and further avoiding the occurrence of a short circuit between the cover plate 1 and the pole structure 2, thereby improving the safety of the battery.

[0052] In one embodiment, the outer edge region of the plastic component bottom surface 401 overlaps the inner edge region of the insulating ring 3 to form a second lap ring. The second lap ring has a width L2, where L2 is ≥ 0.5 mm. The outer edge region of the plastic component bottom surface 401 refers to the edge portion of the plastic component bottom surface 401 near its outer contour; the inner edge region of the insulating ring 3 refers to the edge portion of the insulating ring 3 near its inner ring. The shape of the second lap ring is the same as that of the insulating ring 3, and the width of the second lap ring is smaller than the width of the insulating ring 3. The second lap ring is the overlapping portion where the plastic component bottom surface 401 overlaps the insulating ring 3. If L2 is less than 0.5 mm, the width of the second lap ring is too narrow, and the portion of the plastic component bottom surface 401 pressing against the insulating ring 3 is too small, resulting in poor insulation. There is still a possibility that water droplets condensed on the outer peripheral surface of the extended edge 402 of the first plastic component 4 may connect the rivet block 202 of the pole structure 2 with the portion of the cover plate 1 located inside the inner ring of the annular groove 102, thereby causing a short circuit between the pole structure 2 and the cover plate 1. Therefore, by setting the width L2 of the second lap ring formed by the overlap between the outer edge area of ​​the plastic component bottom surface 401 and the inner edge area of ​​the insulating ring 3 to be greater than or equal to 0.5 mm, it is possible to ensure that the plastic component bottom surface 401 of the first plastic component 4 and the insulating ring 3 have sufficient overlap, thereby improving insulation, further preventing short circuits between the cover plate 1 and the pole structure 2, and enhancing the safety and reliability of the battery.

[0053] In one embodiment, in the width direction of the cover plate 1, the vertical distance between the outer ring of the annular groove 102 and the side of the cover plate 1 is L0, where L0 ≥ 1.5 mm. It should be noted that the width direction refers to Figures 10 and 11The "width direction" indicated by the middle arrow, L0, is the distance between the outer contour of the annular groove 102 and the edge of the cover plate 1 along the width direction of the cover plate 1, and is also the distance between the outer contour edge of the insulating ring 3 and the edge of the cover plate 1, wherein the edge of the cover plate 1 is used for welding to the shell. If L0 is less than 1.5mm, the distance between the edge of the insulating ring 3 and the cover plate 1 is too small. During the spraying process of the insulating ring 3, some paint will fall into the shell cover welding area, and welding explosion points will appear during the welding process, affecting the welding quality. In addition, due to the influence of welding thermal deformation, the outer ring edge of the insulating ring 3 will have the risk of thermal warping. Therefore, by setting the vertical distance L0 between the outer ring of the annular groove 102 and the side of the cover plate 1 in the width direction of the cover plate 1 to be greater than or equal to 1.5mm, it is possible to avoid paint falling into the shell cover welding area during the spraying process of the insulating ring 3, thereby ensuring the welding quality, and reducing the risk of thermal warping of the outer ring edge of the insulating ring 3 due to the influence of welding heat, thereby further ensuring that the insulating ring 3 plays its insulating role and ensuring the safety of the battery.

[0054] In one embodiment, the first plastic part 4 further includes an extended edge 402, which extends from the outer edge of the plastic part bottom surface 401 in a direction away from the cover plate 1. A second through hole 403 is defined on the plastic part bottom surface 401. The pole structure 2 includes a pole 201 and a rivet block 202. The rivet block 202 is located in a groove defined by the plastic part bottom surface 401 and the extended edge 402 of the first plastic part 4. The pole 201 sequentially passes through the pole through hole 101 and the second through hole 403 and is then riveted to the rivet block 202. By providing the first plastic part 4 with a plastic part bottom surface 401 and an extended edge 402 connected to the outer edge of the plastic part bottom surface 401, the first plastic part 4 is formed as a whole in the form of a groove. By embedding the rivet block 202 of the pole structure 2 into the groove formed by the first plastic part 4, the plastic part bottom surface 401 is located between the rivet block 202 and the cover plate 1. The extended edge 402 surrounds the circumferential surface of the rivet block 202, further improving the insulation protection of the rivet block 202. While ensuring that the rivet block 202 is electrically connected to the electrode group inside the battery through the pole 201, the insulation between the rivet block 202 and the cover plate 1 is ensured, thereby improving the safety of the battery.

[0055] It should be noted that, for the cover assembly without the annular groove 102 and the insulating ring 3, there will be a spacing of 0.3mm-1mm between the top cover patch 5 and the first plastic part 4. The situation in which water droplets accumulated on the surface of the plastic part cause a short circuit between the pole and the cover plate refers to the accumulation of water droplets on the outer peripheral surface of the extended edge 402 of the first plastic part 4, so that the accumulated water droplets connect the rivet block 202 of the pole structure 2 with the portion of the cover plate 1 that is close to the first plastic part 4 and not covered by the top cover patch 5, thereby causing a short circuit between the pole structure 2 and the cover plate 1. The cover assembly of the present application increases the insulation between the first plastic part 4 and the cover plate 1 by opening an annular groove 102 at the portion of the cover plate 1 that cannot be covered by the cover plate 1 and spraying the insulating ring 3 in the annular groove 102, thereby avoiding the portion of the cover plate 1 close to the first plastic part 4 from being exposed to the air, thereby reducing the risk of a short circuit between the cover plate 1 and the pole structure 2.

[0056] In one embodiment, the cover plate assembly further includes: a sealing ring 6, which is sleeved on the pole 201 to ensure insulation and sealing between the pole 201 and the cover plate 1; and a second plastic part 7, which is arranged on a side of the cover plate 1 away from the first surface 110 to ensure insulation between the cover plate 1 and the pole group.

[0057] In one embodiment, an explosion-proof valve hole 103 is further provided on the cover plate 1, and the explosion-proof valve hole 103 penetrates the cover plate 1 along the thickness direction of the cover plate 1; the cover plate assembly also includes an explosion-proof valve 8, which is installed in the explosion-proof valve hole 103. The explosion-proof valve 8 is suitable for opening when the air pressure inside the battery is greater than a preset value to discharge the high-pressure gas inside the battery through the explosion-proof valve hole 103 to prevent the battery from exploding; an explosion-proof valve patch 801 is affixed to the explosion-proof valve 8 to protect the explosion-proof valve 8; a third through hole 502 corresponding to the explosion-proof valve 8 is also provided on the top cover patch 5 to facilitate the opening of the explosion-proof valve 8.

[0058] According to another aspect of an embodiment of the present invention, a battery is provided, comprising: a housing, an electrode group, and the aforementioned cover plate assembly. The housing has an open end; the electrode group is positioned within the housing and has a tab; the cover plate assembly covers the open end of the housing, and the electrode column structure 2 in the cover plate assembly is electrically connected to the tab of the electrode group. Optionally, the battery is a lithium-ion battery.

[0059] 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. Such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized in that: include: The cover plate is provided with a pole through hole and an annular groove, wherein the annular groove is formed by recessing a portion of the first surface of the cover plate, and the pole through hole is located in the area surrounded by the inner ring of the annular groove; A pole structure, inserted into the pole through-hole; an insulating ring, disposed in the annular groove and adapted to the annular groove; a first plastic part, disposed between the pole structure and the first surface, wherein a bottom surface of the first plastic part abuts against the first surface, and an outer contour of an orthographic projection of the bottom surface of the plastic part on the first surface is located between an inner ring and an outer ring of the annular groove; A top cover patch is attached to the first surface. A first through hole is formed on the top cover patch. The opening contour of the first through hole is larger than the outer contour of the bottom surface of the plastic component and smaller than the outer contour of the insulating ring.

2. The cover plate assembly according to claim 1, wherein: The insulating ring is a coating layer.

3. The cover plate assembly according to claim 1, wherein: The recessed depth of the annular groove along the thickness direction of the cover plate is T1, wherein 0.05 mm ≤ T1 ≤ 0.3 mm.

4. The cover plate assembly according to claim 1, wherein: The annular groove has a width of W1, wherein 1.5 mm ≤ W1 ≤ 10 mm.

5. The cover plate assembly according to claim 1, wherein: On the first surface of the cover plate, the inner ring of the annular groove and the pole through hole are spaced apart and the shortest distance therebetween is W2, wherein W2 is ≥ 0.5 mm.

6. The cover plate assembly according to claim 1, wherein: The edge area of ​​the top cover patch close to the first through hole overlaps with the outer ring edge area of ​​the insulating ring to form a first overlapping ring. The ring width of the first overlapping ring is L1, where L1 is ≥1 mm.

7. The cover plate assembly according to claim 1, wherein: The outer edge area of ​​the bottom surface of the plastic part overlaps with the inner ring edge area of ​​the insulating ring to form a second overlapping ring. The ring width of the second overlapping ring is L2, wherein L2≥0.5mm.

8. The cover plate assembly according to claim 1, wherein: In the width direction of the cover plate, a vertical distance between the outer ring of the annular groove and the side edge of the cover plate is L0, wherein L0 ≥ 1.5 mm.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The first plastic part further includes an extension edge, the extension edge being formed by extending from the outer edge of the bottom surface of the plastic part in a direction away from the cover plate, and a second through hole is formed on the bottom surface of the plastic part; The pole structure includes a pole and a rivet block. The rivet block is located in a groove surrounded by the bottom surface of the first plastic part and the extended edge. The pole passes through the pole through hole and the second through hole in sequence and is riveted to the rivet block.

10. A battery, characterized in that: include: a housing having an open end; A pole group is placed inside the shell, and the pole group has pole ears; The cover plate assembly according to any one of claims 1 to 9 is provided on the open end of the shell, and the pole structure in the cover plate assembly is electrically connected to the pole tab of the pole group.

Images