Cover plate structure and battery

Abstract

The invention relates to the technical field of batteries, and discloses a cover plate structure and a battery. The cover plate structure comprises a cover plate body, a pole assembly, an insulation assembly and a top cover patch. The insulating plate is located in the groove in the cover plate body, and the outer contour of the insulating plate is larger than the outer contour of the plastic part main body of the first plastic part located on the side, away from the bottom face of the groove, of the insulating plate, so that direct contact between the plastic part main body and the first surface of the cover plate body is avoided; meanwhile, the opening outline of a third through hole in the top cover patch is set to be smaller than the outer outline of the insulating plate, so that the edge area, close to the third through hole, of the top cover patch is in lap joint with the insulating plate, and the gap between the top cover patch and the peripheral side of the first plastic part completely falls on the insulating plate; the partial area, close to the peripheral side of the plastic part main body, of the first surface of the cover plate body is prevented from being exposed in the air, and the problem of short circuit between the cover plate body and the pole assembly caused by lap joint of the cover plate body and the limiting part through water drops condensed on the first plastic part is avoided.

Description

Technical Field

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

[0002] The battery is mainly composed of a shell, a cover plate structure and an electrode group, wherein the cover plate structure includes a cover plate body, an electrode column and a plastic part arranged on the cover plate body, etc. The first plastic part of the plastic part is arranged on the side of the cover plate body facing the outside of the shell and is located between the cover plate body and the electrode column to ensure insulation between the electrode column and the cover plate body. A top cover patch is also attached to the side of the cover plate body facing the outside of the shell, and the top cover patch is made of insulating material to protect the cover plate body.

[0003] However, due to the manufacturing tolerance of the top cover patch and the positioning tolerance of the equipment, there is a certain gap between the top cover patch and the upper plastic, and the part of the cover body corresponding to the gap is exposed to the air. For batteries used in an environment with a large temperature difference between day and night, water droplets will condense on the outer surface of the battery. When the battery is in this environment for a long time, the condensed water droplets will gradually accumulate. The water droplets accumulated on the outer surface of the first plastic part will connect the part of the cover body exposed to the air with the surface of the pole facing the outside of the shell, thereby causing a short circuit between the pole and the cover body, which is very dangerous. Summary of the invention

[0004] In view of this, the present invention provides a cover plate structure and a battery to solve the problem of short circuit between the pole and the cover plate body 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 structure, including: a cover body, a first surface is formed along the first side of the cover body in the thickness direction, a groove is constructed on the first surface, and a pole through hole is provided on the bottom surface of the groove; a pole assembly, including a column inserted in the pole through hole and a limiting portion connected to the column, the outer contour of the limiting portion is larger than the outer contour of the column, and the limiting portion is located on the first side of the cover body; an insulating assembly, located between the cover body and the limiting portion, the insulating assembly includes an insulating plate and a first plastic part, the insulating plate is arranged in the groove and has a first through hole for the column to pass through, the plastic body of the first plastic part is arranged between the insulating plate and the limiting portion and has a second through hole for the column to pass through, the outer contour of the insulating plate is larger than the outer contour of the plastic body; a top cover patch, attached to the first surface, a third through hole is provided on the top cover patch, and the opening contour of the third through hole is greater than or equal to the outer contour of the plastic body and smaller than the outer contour of the insulating plate.

[0006] Beneficial effect: By arranging an insulating component between the cover body and the limiting part, the insulation between the limiting part and the cover body is ensured. By arranging the insulating plate in the groove and the outer contour of the insulating plate being larger than the outer contour of the plastic body of the first plastic part located on the side of the insulating plate away from the bottom surface of the groove, the orthographic projection of the insulating plate on the first surface is larger than the orthographic projection of the plastic body on the first surface, thereby avoiding direct contact between the plastic body and the first surface of the cover body. At the same time, by arranging the opening contour of the third through hole on the top cover patch to be smaller than the outer contour of the insulating plate, the edge area of ​​the top cover patch close to the third through hole is overlapped on the insulating plate, so that the gap between the top cover patch and the outer peripheral side of the first plastic part caused by manufacturing tolerance or equipment fitting positioning tolerance falls completely on the insulating plate, avoiding partial area of ​​the outer peripheral side of the plastic body on the first surface of the cover body from being exposed to the air, avoiding the problem of short circuit between the cover body and the pole assembly caused by overlapping of the cover body and the limiting part through water droplets condensed on the first plastic part, thereby improving the safety of the battery.

[0007] In an optional embodiment, the groove is a quadrilateral groove, the insulating plate and the plastic body are both quadrilaterals; the dimension of the insulating plate along the width direction of the cover body is W2, and the dimension of the plastic body along the width direction of the cover body is W3, wherein (W2-W3) / 2≥0.1mm, and 1<W2 / W3≤1.4.

[0008] Beneficial effects: on the one hand, it is ensured that the insulating plate is sufficiently larger than the plastic body in the width direction, so that the top cover patch can be overlapped on the insulating plate, and the excess portion of the insulating plate than the plastic body is sufficient to fill the gap between the top cover patch and the plastic body, avoiding the area on the first surface of the cover body close to the first plastic part being exposed to the air; on the other hand, it is avoided that the edge of the insulating plate is warped due to the excess portion of the insulating plate being too large compared to the plastic body, thereby avoiding affecting the bonding strength of the overlapping portion of the top cover patch and the insulating plate, and avoiding the overlapping portion of the top cover patch and the insulating plate from warping and exposing the cover body. The two aspects are combined to ensure the insulation between the first plastic part and the cover body, and prevent the pole assembly and the cover body from short-circuiting.

[0009] In an optional embodiment, the dimension of the insulating plate along the length direction of the cover body is L2, and the dimension of the plastic body along the length direction of the cover body is L3, wherein (L2-L3) / 2≥0.1mm, and 1<L2 / L3≤1.6.

[0010] Beneficial effects: on the one hand, it is ensured that the insulating plate is sufficiently larger than the plastic body along the length direction to ensure that the top cover patch can be overlapped on the insulating plate, and the portion of the insulating plate that is larger than the plastic body is sufficient to cover the gap between the top cover patch and the plastic body, avoiding the area on the first surface of the cover body close to the first plastic part being exposed to the air; on the other hand, it is avoided that the edge of the insulating plate is warped due to the portion of the insulating plate that is larger than the plastic body is too large, thereby avoiding affecting the bonding strength of the overlapping portion of the top cover patch and the insulating plate, and avoiding the overlapping portion of the top cover patch and the insulating plate from warping and exposing the cover body. The combination of these two aspects jointly ensures the insulation between the first plastic part and the cover body, and prevents short circuit between the pole assembly and the cover body.

[0011] In an optional embodiment, a dimension W2 of the insulating plate along the width direction of the cover body has a value range of 8mm<W2≤28mm; a dimension W3 of the plastic component body along the width direction of the cover body has a value range of 8mm≤W3≤20mm.

[0012] Beneficial effect: while ensuring that the width of the insulating plate is greater than the width of the plastic body, the widths of the insulating plate and the plastic body are both within a reasonable range, which can not only ensure the current capacity of the pole assembly, but also reduce the risk of thermal warping of the outer ring edge of the insulating ring due to the influence of welding heat. The excess portion of the insulating plate than the plastic body is sufficient to cover the gap between the top cover patch and the plastic body, thereby ensuring the insulation between the first plastic part and the cover body and preventing a short circuit between the pole assembly and the cover body.

[0013] In an optional embodiment, a dimension L2 of the insulating plate along the length direction of the cover body has a value range of 15mm<L2≤128mm; a dimension L3 of the plastic component body along the length direction of the cover body has a value range of 15mm≤L3≤80mm.

[0014] Beneficial effect: while ensuring that the length of the insulating plate is greater than the width of the plastic body, the lengths of the insulating plate and the plastic body are both within a reasonable range, which can not only ensure the current capacity of the pole assembly, but also save materials, avoid the edges of the insulating plate on both sides along the length direction from warping, and ensure the insulation between the first plastic part and the cover body, prevent the pole assembly and the cover body from short-circuiting, and improve safety.

[0015] In an optional embodiment, a dimension of the cover plate body along its width direction is W1, wherein (W1-W2) / 2≥1 mm.

[0016] Beneficial effect: By setting (W1-W2) / 2≥1mm, the distance from the edge of the insulating plate to the edge of the cover body in the width direction is greater than or equal to mm, so as to avoid the insulating plate being affected by the welding heat of the cover body shell and causing shrinkage, warping, burning and other problems, thereby ensuring the reliability of the insulating plate, ensuring the appearance and insulation performance of the insulating plate, and ensuring that the top cover patch can be well overlapped on the edge of the insulating plate, thereby ensuring the insulation between the cover body and the pole assembly.

[0017] In an optional embodiment, along the thickness direction of the cover plate body, the thickness dimension of the insulating plate is equal to the groove depth of the groove.

[0018] Beneficial effect: By setting the thickness of the insulating plate to be equal to the groove depth of the groove, when the insulating plate is assembled on the cover body, the upper surface of the insulating plate is flush with the first surface of the cover body, which makes it easy for the top cover patch to be attached to the cover body and the insulating plate in a flattened state, avoiding step-like wrinkles on the top cover patch due to the insulating plate and the first surface not being on the same plane, thereby ensuring that the top cover patch is completely fitted with the cover body and the insulating plate, ensuring sealing and insulation, and avoiding water droplets from entering the bottom of the top cover patch through the gap between the top cover patch and the insulating plate and contacting the first surface, thereby further avoiding the cover body and the pole assembly from overlapping due to accumulated water droplets, avoiding short circuits, and improving safety.

[0019] In an optional embodiment, a dimension of the cover plate body along its thickness direction is H1, and a dimension of the insulating plate along the thickness direction of the cover plate body is H2, wherein 0.15≤H2 / H1≤0.45.

[0020] Beneficial effect: It can ensure that the insulating plate has sufficient thickness and avoid cracking or warping of the insulating plate, thereby improving reliability and ensuring good insulation. It can also avoid the reduction of the structural strength of the cover body due to excessive thickness of the insulating plate and excessive depth of the groove, thereby ensuring the stability and reliability of the cover body.

[0021] In an optional implementation, a dimension H1 of the cover plate body along its thickness direction has a value range of: 1.5 mm ≤ H1 ≤ 3 mm.

[0022] Beneficial effects: It can ensure that the cover body has sufficient strength and reliability, and that the groove has sufficient groove depth, so that the insulating plate has sufficient thickness, avoid cracking or edge warping of the insulating plate, ensure insulation, and avoid excessive thickness of the cover body, reduce weight and save costs.

[0023] In a second aspect, the present invention further provides a battery, comprising: a housing having an open end; a pole group placed inside the housing, the pole group having a pole lug; the above-mentioned cover plate structure, covering the open end of the housing, the pole column assembly in the cover plate structure being electrically connected to the pole lug. Because the battery includes the cover plate structure, it has the same effect as the cover plate structure, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0026] Figure 2 A schematic diagram of the positional relationship between the top cover patch and other components on the cover plate structure during the assembly process of the cover plate structure according to an embodiment of the present invention;

[0027] Figure 3 for Figure 1 The schematic diagram of the structure after the cover plate structure is assembled is shown;

[0028] Figure 4 for Figure 3 A top view of the cover structure shown;

[0029] Figure 5 for Figure 4 Sectional view in the AA direction;

[0030] Figure 6 for Figure 5 The cross-sectional view of the cover plate structure shown includes a partial enlarged schematic diagram of the pole assembly part;

[0031] Figure 7 for Figure 4 Cross-sectional view in the BB direction;

[0032] Figure 8 Schematic diagram of the structure of the first plastic part of an embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Cover plate body; 101. Groove; 102. Pole through hole; 103. Explosion-proof valve hole; 110. First surface; 2. Pole assembly; 201. Column; 202. Limiting portion; 3. Insulating plate; 301. First through hole; 4. First plastic part; 401. Plastic part body; 402. Extended edge; 403. Second through hole; 5. Top cover patch; 501. Third through hole; 502. Fourth through hole; 6. Sealing ring; 7. Second plastic part; 8. Explosion-proof valve; 801. Explosion-proof valve patch. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 creative work are within the scope of protection of the present invention.

[0036] Combine the following Figures 1 to 8 , describing an embodiment of the present invention.

[0037] According to an embodiment of the present invention, on the one hand, a cover structure is provided, including: a cover body 1, a pole assembly 2, an insulating assembly and a top cover patch 5. The cover body 1 forms a first surface 110 along the first side in the thickness direction thereof, and a groove 101 is constructed on the first surface 110, and a pole through hole 102 is provided on the bottom surface of the groove 101; the pole assembly 2 includes a column 201 penetrating in the pole through hole 102 and a limiting portion 202 connected to the column 201, the outer contour of the limiting portion 202 is larger than the outer contour of the column 201, and the limiting portion 202 is located on the first side of the cover body 1; the insulating assembly is located between the cover body 1 and the limiting portion 202, and the insulating assembly includes an insulating plate 3 and a first plastic part 4, the insulating plate 3 is arranged in the groove 101 and is provided with a first through hole 301 for the column 201 to pass through, the plastic body 401 of the first plastic part 4 is arranged between the insulating plate 3 and the limiting portion 202 and is provided with a second through hole 403 for the column 201 to pass through, and the outer contour of the insulating plate 3 is larger than the outer contour of the plastic body 401; the top cover patch 5 is attached to the first surface 110, and a third through hole 501 is provided on the top cover patch 5, and the opening contour of the third through hole 501 is greater than or equal to the outer contour of the plastic body 401 and smaller than the outer contour of the insulating plate 3.

[0038] The first side of the cover body 1 refers to the Figure 1 and Figures 5 to 7The first surface 110 is the surface of the cover body 1 located on the first side thereof. Specifically, when the cover structure is assembled with the battery housing, the first surface 110 is the surface facing the outer side of the housing. The groove 101 is formed by a portion of the first surface 110 being recessed downward. The pole through hole 102 is formed along the Figure 1 and Figures 5 to 7 The “up and down” direction indicated by the middle arrow passes through the cover body 1 .

[0039] In the cover structure of the present embodiment, an insulating component is provided between the cover body 1 and the limiting portion 202 to ensure insulation between the limiting portion 202 and the cover body 1. The insulating plate 3 is provided in the groove 101, and the outer contour of the insulating plate 3 is larger than the outer contour of the plastic body 401 of the first plastic part 4 located on the side of the insulating plate 3 away from the bottom surface of the groove 101, so that the orthographic projection of the insulating plate 3 on the first surface 110 is larger than the orthographic projection of the plastic body 401 on the first surface 110, thereby avoiding direct contact between the plastic body 401 and the first surface of the cover body 1. At the same time, the first plastic part 401 on the top cover patch 5 is provided. The opening contour of the three through holes 501 is smaller than the outer contour of the insulating plate 3, so that the edge area of ​​the top cover patch 5 near the third through hole 501 overlaps the insulating plate 3, so that the gap between the top cover patch 5 and the outer peripheral side of the first plastic part 4 caused by manufacturing tolerance or equipment fitting positioning tolerance falls completely on the insulating plate 3, avoiding that part of the outer peripheral area of ​​the first surface 110 of the cover body 1 near the plastic part main body 401 is exposed to the air, and avoiding the problem of short circuit between the cover body 1 and the pole assembly 2 caused by overlapping of the cover body 1 and the limiting portion 202 through water droplets condensed on the first plastic part 4, thereby improving the safety of the battery.

[0040] It should be noted that the outer contour of the orthographic projection of the insulating plate 3 on the first surface 110 is larger than the outer contour of the orthographic projection of the plastic body 401 on the first surface 110; the opening contour of the third through hole 501 is greater than or equal to the outer contour of the plastic body 401 on the first surface 110 and smaller than the outer contour of the orthographic projection of the insulating plate 3 on the first surface 110; wherein, the opening contour of the third through hole 501 is greater than or equal to the outer contour of the plastic body 401, which can ensure that the plastic body 401 can smoothly pass through the third through hole 501, thereby ensuring the smooth assembly of the cover structure. The pole through hole 102 passes through the bottom surface of the groove 101, thereby passing through the cover body 1. The column 201 in the pole assembly 2 is arranged in the pole through hole 102 and the limiting portion 202 is located on the first side of the cover body 1. The column 201 passes through the pole through hole 102 on the cover body 1, the first through hole 301 on the insulating plate 3, and the second through hole 403 on the first plastic part 4 from the bottom of the cover body 1 in sequence, and is fixedly connected to the limiting portion 202. The limiting portion 202 presses the insulating plate 3 and the first plastic part 4 onto the cover body 1.

[0041] Optionally, the cover body 1 is made of aluminum, the insulating plate 3 is made of plastic material such as PP, PPS, etc., and the insulating plate 3 can be formed by punching, injection molding, or other processes.

[0042] In one embodiment, the limiting portion 202 is a riveting block, the column 201 is riveted to the riveting block, and presses the cover body 1, the insulating plate 3 and the first plastic part 4, so as to achieve relative fixation of the pole assembly 2 and the cover body 1, the insulating plate 3 and the first plastic part 4.

[0043] In one embodiment, the first plastic part 4 further includes an extension edge 402, which is formed by extending from the outer edge of the plastic body 401 in a direction away from the cover body 1, and the riveting block is located in a groove surrounded by the plastic body 401 and the extension edge 402 of the first plastic part 4. By providing the first plastic part 4 with the plastic body 401 and the extension edge 402 connected to the outer edge of the plastic body 401, the first plastic part 4 is in the form of a groove as a whole, and by embedding the riveting block of the pole assembly 2 into the groove formed by the first plastic part 4, the plastic body 401 is located between the riveting block and the cover body 1, and the extension edge 402 surrounds the circumferential surface of the riveting block, further improving the insulation protection of the riveting block, while ensuring that the riveting block is electrically connected to the pole group inside the battery through the column 201, the insulation between the riveting block and the cover body 1 is ensured, thereby improving the safety of the battery.

[0044] It should be noted that the insulating plate 3 is added before the cover plate structure is riveted, and the insulating plate 3 and the cover plate body 1 are integrally riveted and formed. After riveting, the insulating plate 3 will be subjected to force, which may cause the periphery to warp, so the insulating plate 3 needs to be further limited to avoid the edge of the insulating plate 3 from warping. Specifically, the insulating plate 3 and the first plastic part 4 are assembled with the cover plate body 1 one by one, and the structure of each component is relatively simple, easy to process, convenient to replace, and has good versatility.

[0045] In one embodiment, the groove 101 is a quadrilateral groove, the insulating plate 3 and the plastic body 401 are both quadrilaterals; the size of the insulating plate 3 along the width direction of the cover body 1 is W2, and the size of the plastic body 401 along the width direction of the cover body 1 is W3, wherein (W2-W3) / 2≥0.1mm, and 1<W2 / W3≤1.4. The width direction refers to Figure 4 and Figure 7 The arrow in the middle indicates the "width direction". W2 is the width dimension of the insulating plate 3, and W3 is the width dimension of the plastic body 401. Since the outer contour of the insulating plate 3 is larger than the outer contour of the plastic body 401, along the width direction, the width dimension W2 of the insulating plate 3 and the width dimension W3 of the plastic body 401 satisfy W2>W3, that is, W2 / W3>1. W3 is also the dimension of the overlapping area of ​​the plastic body 401 and the insulating plate 3 along the width direction.

[0046] It should be noted that the center point of the plastic component body 401 coincides with the center point of the insulating plate 3, and the plastic component body 401 is symmetrical about a straight line passing through the center point of the upper surface of the insulating plate 3 and parallel to the length direction of the cover body 1. Then, on both sides along the width direction, the size of the portion of the insulating plate 3 that is more than the plastic component body 401 is the same, both are (W2-W3) / 2. If (W2-W3) / 2 is less than 0.1mm, the size of the portion of the insulating plate 3 that is more than the plastic component body 401 along the width direction is too small, and there may be a situation where the top cover patch 5 cannot be overlapped with the insulating plate 3. The portion of the insulating plate 3 that is more than the plastic component body 401 is not enough to fill the gap between the top cover patch 5 and the plastic component body 401, so it is difficult to ensure the insulation between the first plastic component 4 and the cover body 1. If W2 / W3 is less than or equal to 1, the limiting condition that the outer contour of the insulating plate 3 is larger than the outer contour of the plastic body 401 cannot be satisfied, and the plastic body 401 may be in direct contact with the first surface of the cover body 1 or the plastic body 401 may be aligned with the insulating plate 3 along the width direction, so that the edge area of ​​the top cover patch 5 close to the third through hole 501 cannot be overlapped on the insulating plate 3 along the width direction, and the gap between the top cover patch 5 and the outer peripheral side of the first plastic part 4 makes a part of the outer peripheral side of the cover body 1 close to the plastic body 401 exposed to the air, and there is still a problem of short circuit between the cover body 1 and the pole assembly 2 due to the overlap between the cover body 1 and the limiting part 202 through the water droplets condensed on the first plastic part 4; The larger the value of W2 / W3 is, the larger the width dimension W2 of the insulating plate 3 is relative to the width dimension W3 of the plastic body 401, that is, the larger the dimension of the insulating plate 3 along the width direction is compared with the plastic body 401. If W2 / W3 is greater than 1.4, W2 is too large relative to W3, and the dimension of the insulating plate 3 extending relative to the plastic body 401 is too large. After the battery is assembled, the insulating plate 3 is subjected to pressure from the first plastic part 4 and the limiting part 202. The insulating plate 3 is prone to warping at the edges under pressure. After the top cover patch 5 is attached, the bonding strength of the overlapping part of the top cover patch 5 and the insulating plate 3 is low, and it is also easy to warp, exposing the cover body 1, thereby failing to ensure the insulation between the cover body 1 and the first plastic part 4.

[0047] Therefore, by limiting the width dimension W2 of the insulating plate 3 and the width dimension W3 of the plastic body 401 to satisfy the relationship (W2-W3) / 2≥0.1mm and 1<W2 / W3≤1.4, on the one hand, it is ensured that the insulating plate 3 is sufficiently larger than the plastic body 401 in the width direction, so that the top cover patch 5 can be overlapped on the insulating plate 3, and the excess portion of the insulating plate 3 over the plastic body 401 is sufficient to fill the gap between the top cover patch 5 and the plastic body 401, thereby avoiding the cover body 1 from being overlapped. On one hand, the area close to the first plastic part 4 on the surface 110 is exposed to the air. On the other hand, the edge of the insulating plate 3 is prevented from warping due to the excess size of the insulating plate 3 compared to the plastic part main body 401, thereby avoiding affecting the bonding strength of the overlapping portion of the top cover patch 5 and the insulating plate 3, and avoiding the overlapping portion of the top cover patch 5 and the insulating plate 3 from warping and exposing the cover body 1. The two aspects are combined to ensure the insulation between the first plastic part 4 and the cover body 1, and prevent the pole assembly 2 and the cover body 1 from short circuiting.

[0048] In one embodiment, the dimension of the insulating plate 3 along the length direction of the cover body 1 is L2, and the dimension of the plastic body 401 along the length direction of the cover body 1 is L3, wherein (L2-L3) / 2≥0.1mm, and 1<L2 / L3≤1.6. Figure 4 and Figure 5 to Figure 6 The arrow in the middle indicates the "length direction". L2 is the length dimension of the insulating plate 3, and L3 is the length dimension of the plastic body 401. Since the outer contour of the insulating plate 3 is larger than the outer contour of the plastic body 401, along the length direction, the length dimension L2 of the insulating plate 3 and the length dimension L3 of the plastic body 401 satisfy L2>L3, that is, L2 / L3>1. L2 is also the length dimension of the overlapping area of ​​the plastic body 401 and the insulating plate 3.

[0049] It should be noted that the plastic component body 401 is symmetrical about a straight line passing through the center point of the upper surface of the insulating plate 3 and parallel to the width direction of the cover body 1. Then, on both sides along the length direction, the size of the portion of the insulating plate 3 that is more than the plastic component body 401 is the same, both are (L2-L3) / 2. If (L2-L3) / 2 is less than 0.1 mm, the size of the portion of the insulating plate 3 that is more than the plastic component body 401 along the length direction is too small, and there may be a situation where the top cover patch 5 cannot be overlapped with the insulating plate 3. The portion of the insulating plate 3 that is more than the plastic component body 401 is not enough to fill the gap between the top cover patch 5 and the plastic component body 401, making it difficult to ensure the insulation between the first plastic component 4 and the cover body 1. If L2 / L3 is less than or equal to 1, the limiting condition that the outer contour of the insulating plate 3 is larger than the outer contour of the plastic body 401 cannot be met, and the plastic body 401 will be in direct contact with the first surface of the cover body 1 or the plastic body 401 will be aligned with the insulating plate 3 along the length direction. As a result, along the length direction, the edge area of ​​the top cover patch 5 close to the third through hole 501 cannot be overlapped on the insulating plate 3, and the gap between the top cover patch 5 and the outer peripheral side of the first plastic part 4 makes a part of the outer peripheral side of the cover body 1 close to the plastic body 401 exposed to the air. There is still a situation where the cover body 1 and the limiting part 202 overlap through the water droplets condensed on the first plastic part 4, resulting in the cover body 1 The problem of short circuit with the pole assembly 2; the larger the value of L2 / L3, the larger the length dimension L2 of the insulating plate 3 is relative to the length dimension L3 of the plastic body 401, that is, the larger the length dimension of the insulating plate 3 that is longer than the plastic body 401. If L2 / L3 is greater than 1.6, L2 is too large relative to L3, and the extending dimension of the insulating plate 3 relative to the plastic body 401 is too large. When the insulating plate 3 is under pressure, the edges on both sides along the length direction are prone to warping. After the top cover patch 5 is attached, the bonding strength of the overlapping part of the top cover patch 5 and the insulating plate 3 is low and it is also easy to warp, exposing the cover body 1, thereby failing to ensure the insulation between the cover body 1 and the first plastic part 4.

[0050] Therefore, by limiting the length dimension L2 of the insulating plate 3 and the length dimension L3 of the plastic body 401 to satisfy the relationship (L2-L3) / 2≥0.1mm, L2 / L3≤1.6, on the one hand, it is ensured that the insulating plate 3 is sufficiently larger than the plastic body 401 along the length direction, so that the top cover patch 5 can be overlapped on the insulating plate 3, and the excess portion of the insulating plate 3 over the plastic body 401 is sufficient to cover the gap between the top cover patch 5 and the plastic body 401, thereby avoiding the area on the first surface 110 of the cover body 1 close to the first plastic part 4 from being exposed to the air. On the other hand, it is avoided that the edge of the insulating plate 3 is warped due to the excess portion of the insulating plate 3 over the plastic body 401 is too large, thereby avoiding affecting the bonding strength of the overlapping portion of the top cover patch 5 and the insulating plate 3, and avoiding the overlapping portion of the top cover patch 5 and the insulating plate 3 from warping and exposing the cover body 1. The two aspects are combined to ensure the insulation between the first plastic part 4 and the cover body 1, and prevent the pole assembly 2 and the cover body 1 from short circuiting.

[0051] In one embodiment, the value range of the dimension W2 of the insulating plate 3 along the width direction of the cover body 1 is: 8mm<W2≤28mm; the value range of the dimension W3 of the plastic body 401 along the width direction of the cover body 1 is: 8mm≤W3≤20mm. If W2 is less than or equal to 8mm or W3 is less than 8mm, the width dimension of the insulating plate 3 and the plastic body 401 is too small, resulting in the size of the limiting portion 202 in the pole assembly surrounded by the first plastic part 4 in the width direction is too small, thereby affecting the flow area of ​​the pole assembly 2 and the busbar, thereby affecting the flow capacity of the battery, and when W2 is equal to 8mm, there is a situation where W2 and W3 are equal, the insulating plate 3 and the plastic body 401 have the same width dimension, the top cover patch 5 cannot overlap on the insulating plate 3 in the width direction, and the gap between the top cover patch 5 and the plastic body 401 will cause the part of the cover body 1 close to the first plastic part 4 to be exposed, and there is a gap between the cover body 1 and the pole The risk of short circuit of the column assembly 2; the edge of the cover body 1 is welded to the shell, if W2 is greater than 28mm, the insulating plate 3 is too close to the sides of the cover body 1 on both sides in the width direction, and the outer edge of the insulating plate 3 will be affected by the thermal deformation of welding during the welding process of the cover body 1 and the shell, resulting in the risk of thermal warping of the outer edge of the insulating plate 3; if W3 is greater than 20mm, the plastic body 401 is too close to the edge of the insulating plate 3 in the width direction, and the part of the insulating plate 3 that is larger than the plastic body 401 is not large enough to fill the gap between the top cover patch 5 and the plastic body 401, so it is difficult to ensure the insulation between the first plastic part 4 and the cover body 1. Among them, the bus is a metal part connected to the side of the limit part 202 away from the cover body 1, which is used for electrical connection between different batteries or between batteries and external equipment.

[0052] Therefore, by setting the width dimension W2 of the insulating plate 3 to satisfy 8mm<W2≤28mm, and the width dimension W3 of the plastic body 401 to satisfy 8mm≤W3≤20mm, it is ensured that W2 is greater than W3, that is, the width dimension of the insulating plate 3 is greater than the width dimension of the plastic body 401, while the width dimensions of the insulating plate 3 and the plastic body 401 are both within a reasonable range, which can not only ensure the current carrying capacity of the pole assembly 2, but also reduce the risk of thermal warping of the outer ring edge of the insulating plate 3 due to the influence of welding heat, and the portion of the insulating plate 3 that is more than the plastic body 401 can be sufficient to cover the gap between the top cover patch 5 and the plastic body 401, thereby ensuring the insulation between the first plastic part 4 and the cover body 1, and preventing the pole assembly 2 and the cover body 1 from short circuiting.

[0053] Preferably, 8.4 mm ≤ W2 ≤ 28 mm.

[0054] In one embodiment, the value range of the dimension L2 of the insulating plate 3 along the length direction of the cover body 1 is: 15mm<L2≤128mm; the value range of the dimension L3 of the plastic body 401 along the length direction of the cover body 1 is: 15mm≤L3≤80mm. If L2 is less than or equal to 15mm or L3 is less than 15mm, the length dimension of the insulating plate 3 and the plastic body 401 is too small, resulting in the limitation portion 202 in the pole assembly surrounded by the first plastic part 4 being too small in the length direction, thereby affecting the current carrying capacity of the pole assembly 2, and when L2 is equal to 15mm, there is a situation where L2 and L3 are equal, and the top cover patch 5 cannot overlap on the insulating plate 3 in the length direction, then the gap between the top cover patch 5 and the plastic body 401 will make part of the area of ​​the cover body 1 close to the first plastic part 4 exposed to the outside, with a cover body 1 and the risk of short circuit between the pole assembly 2; if L2 is greater than 128mm, the length of the insulating plate 3 is too large, which wastes materials and has the risk of warping due to the edge along the length direction being too far away from the first plastic part 4; if L3 is greater than 80mm, the plastic body 401 is too close to the edge of the insulating plate 3 along the length direction, and the excess portion of the insulating plate 3 than the plastic body 401 is insufficient in size, and the excess portion of the insulating plate 3 than the plastic body 401 is insufficient to fill the gap between the top cover patch 5 and the plastic body 401, making it difficult to ensure the insulation between the first plastic part 4 and the cover body 1.

[0055] Therefore, by setting the length dimension L2 of the insulating plate 3 to satisfy 15mm<L2≤128mm, and the length dimension L3 of the plastic body 401 to satisfy 15mm≤L3≤80mm, it is ensured that L2 is greater than L3, that is, the length dimension of the insulating plate 3 is greater than the width dimension of the plastic body 401. At the same time, the length dimensions of the insulating plate 3 and the plastic body 401 are both within a reasonable range. This can not only ensure the current carrying capacity of the pole assembly 2, but also save materials, avoid the edges of the insulating plate 3 on both sides along the length direction from warping, and ensure the insulation between the first plastic part 4 and the cover body 1, prevent the pole assembly 2 and the cover body 1 from short circuiting, and improve safety.

[0056] Preferably, 16.2 mm ≤ L2 ≤ 128 mm.

[0057] In one embodiment, the dimension of the cover body 1 along its width direction is W1, where (W1-W2) / 2≥1mm. W1 is the width dimension of the cover body 1, and (W1-W2) / 2 is the distance from the edge of the insulating plate 3 to the edge of the cover body 1 along the width direction. The edge of the cover body 1 is used for welding with the shell. If (W1-W2) / 2 is less than 1mm, the insulating plate 3 is too close to the edge of the cover body 1 along the width direction, and is easily affected by the welding heat, resulting in shrinkage, warping, burning and other problems of the insulating plate 3, affecting the appearance and insulation performance. Therefore, by setting (W1-W2) / 2≥1mm, in the width direction, the distance from the edge of the insulating plate 3 to the edge of the cover body 1 is greater than or equal to 1mm, thereby preventing the insulating plate 3 from being affected by the welding heat of the cover body 1 shell and causing shrinkage, warping, burning and other problems, thereby ensuring the reliability of the insulating plate 3, ensuring the appearance and insulation performance of the insulating plate 3, and ensuring that the top cover patch 5 can be well overlapped on the edge of the insulating plate 3, thereby ensuring the insulation between the cover body 1 and the pole assembly 2.

[0058] In one embodiment, along the thickness direction of the cover body 1, the thickness dimension of the insulating plate 3 is equal to the groove depth of the groove 101. Figure 5 to Figure 6The "up and down" directions indicated by the middle arrows are in the same direction; the groove depth refers to the size of the groove 101 along the up and down direction. By setting the thickness of the insulating plate 3 to be equal to the groove depth of the groove 101, when the insulating plate 3 is assembled on the cover body 1, the upper surface of the insulating plate 3 is flush with the first surface 110 of the cover body 1, so that the top cover patch 5 can be attached to the cover body 1 and the insulating plate 3 in a flattened state, avoiding step-like wrinkles on the top cover patch 5 due to the insulating plate 3 and the first surface 110 not being on the same plane, thereby ensuring that the top cover patch 5 is completely fitted with the cover body 1 and the insulating plate 3, ensuring sealing and insulation, and preventing water droplets from entering the bottom of the top cover patch 5 through the gap between the top cover patch 5 and the insulating plate 3 and contacting the first surface 110, thereby further avoiding the overlap of the cover body 1 and the pole assembly 2 due to the accumulated water droplets, avoiding short circuits and improving safety. Among them, the upper surface refers to Figure 5 to Figure 6 The surface in the "up" direction indicated by the arrow.

[0059] It should be noted that the insulating plate 3 and the groove 101 are the same size and shape, and the insulating plate 3 is just embedded in the groove 101, which is convenient for assembly and positioning, and has good stability after assembly. It can also ensure that the top cover patch 5 fits well with the first surface 110 of the cover body 1 and the overlapping part of the insulating plate 3 to ensure insulation.

[0060] In one embodiment, further combining Figure 7 As shown, the dimension of the cover body 1 along the thickness direction is H1, and the dimension of the insulating plate 3 along the thickness direction of the cover body 1 is H2, wherein 0.15≤H2 / H1≤0.45. It should be noted that H1 is the total thickness of the cover body 1, that is, the maximum thickness of the area on the cover body 1 where the groove 101 is not provided, H2 is the thickness of the insulating plate 3, and the thickness of the insulating plate 3 is equal to the groove depth of the groove 101, then H2 / H1 can represent the proportion of the groove depth of the groove 101 in the total thickness of the cover body 1. If H2 / H1 is greater than 0.45, the groove depth of the groove 101 is too large relative to the thickness of the cover body 1, and the groove depth is too large, resulting in the remaining solid part corresponding to the bottom surface of the groove 101 on the cover body 1. The size along the up and down directions is too small, and the strength of the cover body 1 after molding is low, does not meet the strength requirements, and has poor stability; if H2 / H1 is less than 0.15, the thickness of the insulating plate 3 is too small relative to the thickness of the cover body 1, and the insulating plate 3 is too thin. During the riveting of the pole assembly 2, the insulating plate 3 is prone to cracking, deformation, and warping.

[0061] Therefore, by setting the ratio H2 / H1 between the thickness H2 of the insulating plate 3 and the thickness H1 of the cover plate body 1 to be in the range of 0.15 to 0.45, it can be ensured that the insulating plate 3 has sufficient thickness to avoid cracking or warping of the insulating plate 3, thereby improving reliability and ensuring good insulation. It can also avoid the structural strength of the cover plate body 1 being reduced due to the insulating plate 3 being too thick and the groove 101 being too deep, thereby ensuring the stability and reliability of the cover plate body 1.

[0062] In one embodiment, the dimension H1 of the cover body 1 along its thickness direction has a value range of: 1.5mm≤H1≤3mm. If H1 is less than 1.5mm, the thickness of the cover body 1 is too small, the structural strength is insufficient, and sufficient design space cannot be provided for the groove 101, which leads to insufficient thickness of the insulating plate 3, and the insulating plate 3 is easily pressed to crack or the edges are warped; if H1 is greater than 3mm, the thickness of the cover body 1 is too large, too much material is used, the weight is too large, and the cost is wasted. Therefore, by setting the thickness H1 of the cover body 1 to a value within the range of 1.5mm to 3mm, it can be ensured that the cover body 1 has sufficient strength and reliability, and that the groove 101 has a sufficient groove depth, so that the insulating plate 3 has sufficient thickness, avoids cracking of the insulating plate 3 or edge warping, and ensures insulation, and avoids excessive thickness of the cover body 1, reduces weight, and saves costs.

[0063] In one embodiment, the cover structure also includes: a sealing ring 6, which is sleeved on the column 201 to ensure insulation and sealing between the column 201 and the cover body 1; a second plastic part 7, which is arranged on the side of the cover body 1 away from the first surface 110 to ensure insulation between the cover body 1 and the pole group.

[0064] In one embodiment, an explosion-proof valve hole 103 is further provided on the cover body 1, and the explosion-proof valve hole 103 penetrates the cover body 1 along the thickness direction of the cover body 1; the cover structure 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 gas 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 fourth 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.

[0065] The pole assembly 2 on the cover structure with different parameter values ​​is subjected to an extreme thrust test, and the test results are recorded below to verify the influence of different parameter values ​​on the cover structure. It should be noted that the extreme thrust test refers to applying a thrust from top to bottom to the pole assembly 2 in the direction of the cover body 1 until the pole assembly 2 leaks and the seal fails, then the pole assembly 2 is judged to have failed, and the value of the extreme thrust F at this time is recorded, and it is judged whether it meets the basic requirement of F ≥ 1500N, where the extreme thrust value F is equal to the maximum strength that the cover structure can withstand.

[0066] Table 1 Test results of the implementation case of the cover structure

[0067]

[0068]

[0069] It can be seen from Table 1 that for the cover plate structures of implementation cases 1 to 12, the thickness H2 of the insulating plate 3, the thickness H1, H2 / H1 of the cover plate body 1, the width dimension W2 of the insulating plate 3, the width dimension W3, W2 / W3 of the plastic body 401, the length dimension L2 of the insulating plate 3, and the length dimension L3, L2 / L3 of the plastic body 401 are all within the range specified in the present application, the insulating plate 3 does not warp, and F is greater than 1500N, which meets the strength requirements of the cover plate structure. At the same time, the insulating plate has no problems such as warping and passes the test.

[0070] Table 2 Comparative case test results of cover plate structure

[0071]

[0072] It can be seen from Table 2 that for the cover plate structures of Comparative Cases 1 to 2, the values ​​of H2 / H1 are all greater than 0.45, which are not within the range of 0.15≤H2 / H1≤0.45 specified in the present application. Although the insulating plate 3 does not warp, F is less than 1500N, which does not meet the strength requirement of the cover plate structure. For the cover plate structures of Comparative Cases 3 to 4, the values ​​of H2 / H1 are all less than 0.15, which are not within the range specified in the present application. Although F is greater than 1500N, which can meet the strength requirement of the cover plate structure, the problem of the insulating plate 3 warping occurs, which cannot meet the requirement that the insulating plate 3 does not warp. In the cover plate structures of comparative cases 5 to 8, W2 / W3 is greater than 1.4, which is not within the range of W2 / W3≤1.4 defined in this application. Although F is greater than 1500N, which can meet the structural strength requirements of the cover plate, the problem of the insulating plate 3 warping occurs, and the requirement of the insulating plate 3 not warping cannot be met; for comparative cases 9 to 12, L2 / L3 is greater than 1.6, which is not within the range of L2 / L3≤1.6 defined in this application. Although F is greater than 1500N, which can meet the structural strength requirements of the cover plate, the problem of the insulating plate 3 warping occurs, and the requirement of the insulating plate 3 not warping cannot be met. That is, the cover plate structures of comparative cases 1 to 12 cannot simultaneously meet the structural strength requirements of the cover plate and the requirement of the insulating plate not warping.

[0073] In summary, for the width dimension W2 of the insulating plate 3 and the width dimension W3 of the plastic body 401, when 1<W2 / W3≤1.4 and 8mm<W2≤28mm, 8mm≤W3≤20mm are satisfied, the cover plate structure can simultaneously meet the requirements of the cover plate structure strength and the requirement that the insulating plate does not warp. For the length dimension L2 of the insulating plate 3 and the length dimension L3 of the plastic body 401, when 1<L2 / L3≤1.6 and 15mm<L2≤128mm, 15mm≤L3≤80mm are satisfied, the cover plate structure can simultaneously meet the requirements of the cover plate structure strength and the requirement that the insulating plate does not warp. For the thickness H2 of the insulating plate 3 and the thickness H1 of the cover body 1, when 0.15≤H2 / H1≤0.45 and 1.5mm≤H1≤3mm are satisfied, the cover plate structure can simultaneously meet the requirements of the cover plate structure strength and the requirement that the insulating plate does not warp. Among them, the insulating plate 3 does not warp, which means that the flatness of the insulating plate 3 is less than 0.3mm.

[0074] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising: a housing, a pole group and the above-mentioned cover plate structure. The housing has an open end; the pole group is placed inside the housing, and the pole group has a pole ear; the cover plate structure is covered at the open end of the housing, and the pole column assembly 2 in the cover plate structure is electrically connected to the pole ear. Optionally, the battery is a lithium-ion battery.

[0075] Although the embodiments of the present invention have been 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 structure, characterized in that: include: The cover body has a first surface formed along a first side in a thickness direction thereof, a groove is configured on the first surface, and a pole through hole is provided on the bottom surface of the groove; A pole assembly, comprising a column body passing through the pole through hole and a limiting portion connected to the column body, wherein the outer contour of the limiting portion is larger than the outer contour of the column body, and the limiting portion is located on the first side of the cover plate body; an insulating component, located between the cover plate body and the limiting portion, the insulating component comprising an insulating plate and a first plastic part, the insulating plate being arranged in the groove and having a first through hole for the column to pass through, a plastic part body of the first plastic part being arranged between the insulating plate and the limiting portion and having a second through hole for the column to pass through, and an outer contour of the insulating plate being larger than an outer contour of the plastic part body; A top cover patch is attached to the first surface, and a third through hole is formed on the top cover patch. The opening contour of the third through hole is greater than or equal to the outer contour of the plastic body and smaller than the outer contour of the insulating plate.

2. The cover plate structure according to claim 1, characterized in that: The groove is a quadrilateral groove, and the insulating plate and the plastic body are both quadrilateral; The dimension of the insulating plate along the width direction of the cover body is W2, and the dimension of the plastic body along the width direction of the cover body is W3, wherein (W2-W3) / 2≥0.1mm, and 1<W2 / W3≤1.

4.

3. The cover plate structure according to claim 2, characterized in that: The dimension of the insulating plate along the length direction of the cover body is L2, and the dimension of the plastic body along the length direction of the cover body is L3, wherein (L2-L3) / 2≥0.1mm, and 1<L2 / L3≤1.

6.

4. The cover plate structure according to claim 2, characterized in that: The value range of the dimension W2 of the insulating plate along the width direction of the cover plate body is: 8mm<W2≤28mm; The dimension W3 of the plastic component body along the width direction of the cover body has a value range of 8 mm ≤ W3 ≤ 20 mm.

5. The cover plate structure according to claim 2, characterized in that: The value range of the dimension L2 of the insulating plate along the length direction of the cover plate body is: 15mm<L2≤128mm; The dimension L3 of the plastic body along the length direction of the cover body has a value range of 15 mm ≤ L3 ≤ 80 mm.

6. The cover plate structure according to claim 2, characterized in that: The dimension of the cover body along its width direction is W1, wherein (W1-W2) / 2≥1mm.

7. The cover plate structure according to any one of claims 1 to 6, characterized in that: In the thickness direction of the cover plate body, the thickness of the insulating plate is equal to the depth of the groove.

8. The cover plate structure according to claim 7, characterized in that: The dimension of the cover plate body along the thickness direction thereof is H1, and the dimension of the insulating plate along the thickness direction of the cover plate body is H2, wherein 0.15≤H2 / H1≤0.

45.

9. The cover plate structure according to claim 8, characterized in that: The dimension H1 of the cover plate body along its thickness direction has a value range of 1.5 mm ≤ H1 ≤ 3 mm.

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 structure according to any one of claims 1 to 9 is provided on the open end of the shell, and the pole assembly in the cover plate structure is electrically connected to the pole lug.

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