Battery cover plate and battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery cover plate and a battery, and the battery cover plate comprises a cover plate body, a first plastic part, a pole, a connecting sheet and a sealing part. A first mounting hole is formed in the connecting piece, a seam is formed between the plate body part of the pole and the hole wall of the first mounting hole, and the plate body part and the hole wall of the first mounting hole are welded at the seam to form a welding part. And the sealing element is sleeved on the post body part of the post and is clamped between the post body part and the cover plate body. Along the radial direction of the first mounting hole, the distance A between the seam and the outer wall of the column body part and the width B of the sealing piece meet the condition that A / B is larger than or equal to 0.9 and smaller than or equal to 5.0. Therefore, the plate body part of the pole can provide support for the sealing piece, the periphery of the plate body part does not tilt, and the sealing performance is good. The first plastic part is positioned between the pole and the cover plate body, so that the battery cover plate is good in insulating property and high in safety. The invention also provides a battery which comprises the battery cover plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cover plate and battery. BACKGROUND

[0002] Lithium ion battery has the advantages of safety, high efficiency, no pollution, high specific energy, rich raw materials, multiple cycle times and long storage time, and is widely used in portable electronic devices such as mobile phones, digital cameras and laptop computers, and is also widely used in electric vehicles, electric bicycles and electric tools and other large and medium-sized electric devices, so the safety requirements for lithium ion battery are getting higher and higher.

[0003] For the current lithium ion battery, the pole group and the pole column on the battery cover plate are usually connected by a connecting piece for electric conduction, so as to lead out the electric energy of the pole group. However, when the pole column and the connecting piece are welded, the heat generated by welding may cause the first plastic part of the battery cover plate to melt and deform, and the insulation performance and sealing performance of the battery cover plate are reduced, which seriously affects the safety of the battery. SUMMARY

[0004] The purpose of the present application is to provide a battery cover plate and battery which can effectively seal the pole column of the battery cover plate, avoid leakage at the sealing part of the pole column, and ensure good insulation performance of the battery cover plate and safe use of the battery.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] On the one hand, the present application provides a battery cover plate, comprising:

[0007] a cover plate body;

[0008] a first plastic part arranged on one side of the cover plate body close to the pole group;

[0009] a pole column, the column part of the pole column is sequentially arranged in the first plastic part and the cover plate body, and the plate part of the pole column is attached to the end face of the first plastic part close to the pole group;

[0010] a connecting piece arranged on one side of the pole column close to the pole group, the connecting piece is provided with a first mounting hole, a joint is formed between the plate part of the pole column and the hole wall of the first mounting hole, and the plate part and the hole wall of the first mounting hole are welded to form a welding part at the joint;

[0011] a sealing element sleeved on the column part of the pole column and clamped between the column part and the cover plate body; wherein the distance between the joint and the outer wall of the column part along the radial direction of the first mounting hole is A, and the width of the sealing element is B;

[0012] The relationship between A and B satisfies: 0.9≤A / B≤5.0;

[0013] A is in the range of: 1.35mm≤A≤20mm;

[0014] B is in the range of: 1.5mm≤B≤4mm.

[0015] Optionally, the plate body part has a boss on the side facing the pole group, the boss extends into the first mounting hole, and a circumferential wall of the boss and a hole wall of the first mounting hole form the joint, and the boss and the hole wall of the first mounting hole are welded at the joint to form the welding part.

[0016] Optionally, the connecting sheet includes a first connecting plate and a second connecting plate, and the first mounting hole is arranged on the first connecting plate; along the width direction of the cover plate body, the distance between the first mounting hole and the adjacent side edge of the first connecting plate is C, and the fusion width of the welding part is G1;

[0017] The relationship between C and G1 satisfies: 1.5≤C / G1≤8.0;

[0018] C is in the range of: 1mm≤C≤16mm;

[0019] G1 is in the range of: 0.5mm≤G1≤4mm.

[0020] Optionally, along the length direction of the cover plate body, the distance between the first mounting hole and the adjacent side edge of the first connecting plate is E, and the fusion width of the welding part is G2, G1=G2;

[0021] The relationship between E and G2 satisfies: 1.5≤E / G2≤8.0;

[0022] E is in the range of: 1mm≤E≤16mm;

[0023] G2 is in the range of: 0.5mm≤G2≤4mm.

[0024] Optionally, along the axial direction of the first mounting hole, the distance between the end face of the boss on the side facing the pole group and the end face of the plate body part on the side away from the pole group is H1, and the fusion depth of the welding part is H, and the relationship between H and H1 satisfies: 0.2≤H / H1≤0.8;

[0025] H is in the range of: 0.4mm≤H≤1.6mm;

[0026] H1 is in the range of: 1.5mm≤H1≤4mm.

[0027] Optionally, the first plastic part is provided with a limiting rib on the end face of the side of the pole group, and the limiting rib is used to abut against the side edge of the first connecting plate near the center of the length direction of the cover plate body.

[0028] Optionally, the sealing member comprises a first sealing part and a second sealing part, the second sealing part is connected to the first sealing part, the first sealing part is used to seal the gap between the plate body part and the cover plate body, and the second sealing part is used to seal the gap between the column body part and the cover plate body.

[0029] Optionally, the width of the first sealing part is B in the radial direction of the first mounting hole.

[0030] Optionally, the battery cover plate further comprises a second plastic part and a connecting block, the second plastic part is arranged on the side of the cover plate body away from the first plastic part, the connecting block is arranged on the side of the second plastic part away from the cover plate body, and the column body part of the pole column is riveted to the connecting block after passing through the second plastic part and the connecting block.

[0031] In another aspect, the application provides a battery comprising the battery cover plate in any of the above-mentioned schemes.

[0032] The application has the following beneficial effects:

[0033] The application provides a battery cover plate comprising a cover plate body, a first plastic part, a pole column, a connecting plate and a sealing member. The column body part of the pole column is sequentially arranged in the first plastic part and the cover plate body. The connecting plate is arranged on the side of the pole column close to the pole group, the first mounting hole is arranged on the connecting plate, the joint is formed between the plate body part and the hole wall of the first mounting hole, and the plate body part and the hole wall of the first mounting hole are welded at the joint to form the welding part. The sealing member is sleeved on the column body part of the pole column, and the sealing member is clamped between the column body part of the pole column and the cover plate body. In the radial direction of the first mounting hole, the distance between the joint and the outer wall of the column body part is A, the width of the sealing member is B, and the relationship between A and B satisfies: 0.9≤A / B≤5.0. Thus, the plate body part of the pole column can provide good support for the sealing member, the plate body part of the pole column will not be raised around when the pole column and the cover plate body are assembled, and the sealing is ensured to be good. The first plastic part ensures that the insulation performance of the battery cover plate is good, and the safe use of the battery is ensured.

[0034] The application further provides a battery comprising the above-mentioned battery cover plate. The sealing performance and the insulation performance of the battery cover plate are good, and the safety and reliability of the battery are high. BRIEF DESCRIPTION OF DRAWINGS

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the battery cover provided in an embodiment of the present invention;

[0037] Figure 2 This is an exploded view of the battery cover provided in an embodiment of the present invention;

[0038] Figure 3 This is a top view of the battery cover provided in an embodiment of the present invention;

[0039] Figure 4 yes Figure 3 Cross-sectional view of section I-I;

[0040] Figure 5 yes Figure 4 Enlarged view of a section at point II;

[0041] Figure 6 This is a bottom view of the battery cover provided in an embodiment of the present invention.

[0042] In the picture:

[0043] 100. Cover plate body; 101. Third mounting hole;

[0044] 200. First plastic part; 201. Second mounting hole; 202. Limiting rib;

[0045] 300, pole post; 310, column section; 311, first column; 312, second column; 320, plate section; 330, boss; 331, weld section;

[0046] 400. Connecting piece; 410. First connecting plate; 411. First mounting hole; 420. Second connecting plate;

[0047] 500, Seal; 510, First sealing part; 520, Second sealing part;

[0048] 600, Second plastic part; 601, Fourth mounting hole; 700, Connecting block; 701, Fifth mounting hole. Detailed Implementation

[0049] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. The components of the embodiments of the present application generally described and shown in the drawings can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0051] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0052] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0053] In the description of the present application, it should also be noted that, unless otherwise specified and limited, the terms "provided", "connected" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "over" of a first feature to a second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. "Under", "below" and "underneath" of a first feature to a second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0055] Embodiments of the present application are described in detail below with reference to examples shown in the attached drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0056] As shown in the drawings, Figures 1-4 The present embodiment provides a battery cover plate, which comprises a cover plate body 100, a first plastic part 200, a pole 300, a connecting sheet 400 and a sealing member 500. The first plastic part 200 is arranged on the side of the cover plate body 100 close to the pole group, the pole body part 310 of the pole 300 is sequentially arranged through the first plastic part 200 and the cover plate body 100, and the plate body part 320 of the pole 300 is attached to the end face of the side of the first plastic part 200 close to the pole group. The connecting sheet 400 is arranged on the side of the pole 300 close to the pole group, the first mounting hole 411 is arranged on the connecting sheet 400, the joint is formed between the plate body part 320 of the pole 300 and the hole wall of the first mounting hole 411, and the plate body part 320 and the hole wall of the first mounting hole 411 are welded to form the welding part 331 at the joint. It should be noted that, along the radial direction of the first mounting hole 411, the welding part 331 can completely cover the joint, so as to ensure the welding reliability between the pole 300 and the connecting sheet 400, and the connecting strength is higher.

[0057] Further, the second mounting hole 201 is arranged on the first plastic part 200, the third mounting hole 101 is arranged on the cover plate body 100, and the pole body part 310 of the pole 300 sequentially passes through the first mounting hole 411, the second mounting hole 201 and the third mounting hole 101. The diameter of the second mounting hole 201 is greater than the outer diameter of the sealing member 500, so that the sealing member 500 can pass through the second mounting hole 201 when the battery cover plate is assembled. After the battery cover plate is assembled, the sealing member 500 is sleeved on the pole body part 310 of the pole 300, and the sealing member 500 is clamped between the pole body part 310 of the pole 300 and the cover plate body 100. Through the arrangement of the sealing member 500, the sealing performance of the battery cover plate is ensured to be good.

[0058] Referring toFigure 4 and Figure 5 , the distance between the joint and the outer wall of the column body 310 in the radial direction of the first mounting hole 411 (as indicated by the X-axis direction in Figure 4 , the width of the sealing member 500 is B, and the relationship between A and B satisfies: 0.9≤A / B≤5.0. For example, the value of A / B can be 0.9, 1.0, 2.0, 3.0, 4.0, or 5.0, etc. By limiting the value of A / B within the above range, it is ensured that the plate body 320 of the pole column 300 can provide good support for the sealing member 500, and after the pole column 300 is assembled with the cover plate body 100, the plate body 320 of the pole column 300 will not be raised around, ensuring good sealing. Alternatively, the value of A is in the range of: 1.35mm≤A≤20mm, and the value of B is in the range of: 1.5mm≤B≤4mm. For example, when the value of B is 1.5, the value of A can be 1.35mm, 2.5mm, 4.5mm, or 7.5mm, etc. When the value of B is 2.0, the value of A can be 1.8mm, 2.5mm, 4.5mm, 8.5mm, or 10.0mm, etc. When the value of B is 4.0, the value of A can be 3.2mm, 8.5mm, 15.5mm, or 20.0mm, etc.

[0059] In some alternative embodiments, the plate body 320 has a boss 330 on the side facing the pole group, the boss 330 extends into the first mounting hole 411, and a joint is formed between the peripheral side wall of the boss 330 and the hole wall of the first mounting hole 411, and the boss 330 and the hole wall of the first mounting hole 411 are welded at the joint to form a welded portion 331. Through the cooperation of the boss 330 and the first mounting hole 411, the positioning between the pole column 300 and the connecting sheet 400 can be assisted, and the assembly precision of the battery cover plate can be improved.

[0060] Continuing to refer to Figure 2 , Figure 5 and Figure 6 , the connecting sheet 400 includes a first connecting plate 410 and a second connecting plate 420, the first mounting hole 411 is arranged on the first connecting plate 410, and the first connecting plate 410 and the second connecting plate 420 form an L-shaped structure. The first connecting plate 410 is used to connect with the pole column 300, and the second connecting plate 420 is used to connect with the tab or pole piece of the pole group, so that the electric energy of the pole group is led out through the connecting sheet 400 and the pole column 300. Along the width direction of the cover plate body 100 (i.e. Figure 2(As shown in the Y-axis direction), the distance between the first mounting hole 411 and the adjacent side of the first connecting plate 410 is C, and the weld width of the welded part 331 is G1. The relationship between C and G1 satisfies: 1.5 ≤ C / G1 ≤ 8.0. For example, the value of C / G1 can be 1.5, 2.0, 3.0, 5.0, 7.0, or 8.0, etc. By limiting the value of C / G1 within the above range, it is ensured that the welded part 331 will not exceed the side of the first connecting plate 410 in the width direction, which helps to protect the first plastic part 200 from being melted, thereby ensuring that the first plastic part 200 can perfectly fit with the cover plate body 100 and avoid the risk of insulation failure.

[0061] Optionally, the value of C is in the range of 1mm ≤ C ≤ 16mm. It is important to note that the value of C should not be too small; otherwise, after the first mounting hole 411 is opened in the first connecting plate 410, the mechanical strength of the side of the first connecting plate 410 in the width direction will decrease, failing to meet the requirements for welding and supporting the first plastic part 200. The value of C should also not be too large; otherwise, it will affect the design of the width dimension of the connecting piece 400, resulting in a larger battery cover width, which is not conducive to the miniaturization and thinning of the battery cover. The value of G1 is in the range of 0.5mm ≤ G1 ≤ 4mm. By limiting the value of G1 to meet the above range, the welding strength and welding quality of the welding part 331 can be guaranteed to be high, ensuring a reliable connection between the terminal post 300 and the connecting piece 400. For example, when the value of G1 is 0.5, the value of C can be 1.0mm, 2.0mm, 3.0mm, or 4.0mm, etc. When the value of G1 is 2.0, the value of C can be 3.0mm, 4.0mm, or 5.0mm, etc. When the value of G1 is 4.0, the value of C can be 5.0 mm.

[0062] Furthermore, along the length direction of the cover plate body 100 (i.e. Figure 2 In the X-axis direction shown, the distance between the first mounting hole 411 and the adjacent side of the first connecting plate 410 is E, and the weld width of the welded part 331 is G2. In this embodiment, the welded part 331 is annular, and the width of the welded part 331 tends to be consistent at all points. Therefore, G1 = G2, ensuring that the welding strength of the welded part 331 is consistent at all points, and the connection between the pole post 300 and the connecting piece 400 is reliable. The relationship between E and G2 satisfies: 1.5 ≤ E / G2 ≤ 8.0. For example, the value of E / G2 can be 1.5, 2.0, 3.0, 5.0, 7.0, or 8.0, etc. By limiting the value of E / G1 to the above range, it is ensured that the welded part 331 will not exceed the side of the first connecting plate 410 in the length direction, which helps to protect the first plastic part 200 from being melted, thereby ensuring that the first plastic part 200 can perfectly fit with the cover plate body 100 and avoid the risk of insulation failure.

[0063] Optionally, E is in the range of 1mm≤E≤16mm. It is to be noted that E should not be too small, otherwise the mechanical strength of the adjacent side of the first connecting plate 410 close to the center of the length direction of the cover plate body 100 is reduced after the first mounting hole 411 is opened, which cannot meet the needs of welding and supporting the first plastic part 200; E should not be too large, otherwise it affects the design of the length size of the connecting sheet 400, and the length of the battery cover plate is large, which is not conducive to the miniaturization and lightness of the battery cover plate. G2 is in the range of 0.5mm≤G2≤4mm. By limiting the value of G2 to meet the above range, the welding strength and welding quality of the welding part 331 can be ensured to be high, and the reliable connection between the pole 300 and the connecting sheet 400 can be ensured. For example, when the value of G2 is 0.5, the value of E can be 1.0mm, 2.0mm, 3.0mm or 4.0mm, etc. When the value of G2 is 2.0, the value of E can be 3.0mm, 4.0mm or 5.0mm, etc. When the value of G2 is 4.0, the value of E can be 5.0mm.

[0064] Continuing to refer to Figure 5 , along the axial direction of the first mounting hole 411 (i.e. the Z-axis direction shown in Figure 4 , the distance between the end face of the boss 330 facing the pole group side and the end face of the plate body part 320 away from the pole group side is H1, and the penetration depth of the welding part 331 is H, and the relationship between H and H1 satisfies: 0.2≤H / H1≤0.8. That is, along the axial direction of the first mounting hole 411, the penetration depth of the welding part 331 is smaller than the total thickness of the plate body part 320 (i.e. H1). Thus, it is avoided that the pole 300 is welded through during welding, which causes the first plastic part 200 to be deformed by melting, and the sealing performance and insulation performance of the battery cover plate cannot be guaranteed. Exemplarily, the value of H / H1 can be 0.2, 0.3, 0.5, 0.7, or 0.8, etc.

[0065] Optionally, H is in the range of 0.4mm≤H≤1.6mm. By limiting the value of H to meet the above range, the welding strength and welding quality of the welding part 331 can be ensured to be high, and the reliable connection between the pole 300 and the connecting sheet 400 can be ensured. H1 is in the range of 1.5mm≤H1≤4mm. By limiting the value of H1 to meet the above range, the mechanical strength of the plate body part 320 of the pole 300 can be ensured to be high, which can provide sufficient support for the sealing element 500 and is not prone to deformation, and the reliable sealing between the pole 300 and the cover plate body 100 can be ensured.

[0066] Further, along the axial direction of the first mounting hole 411 (i.e. Figure 4The thickness of the first connecting plate 410 of the connecting piece 400 is t in the Z-axis direction shown in the figure, and t is in the range of 0.8mm≤t≤3mm. The thickness of the boss 330 on the plate body 320 is equal to the thickness of the first connecting plate 410, so that after the boss 330 is assembled with the first mounting hole 411 on the first connecting plate 410, the end face of the boss 330 towards the pole group side is flush with the end face of the first connecting plate 410 towards the pole group side, facilitating welding operation, and the welding quality of the welding part 331 is good, and problems such as hole explosion and virtual welding are not prone to occur.

[0067] The end face of the first plastic part 200 towards the pole group side is provided with a limiting rib 202, which is used to abut against the side edge of the first connecting plate 410 close to the center side of the length direction of the cover plate body 100. The arrangement of the limiting rib 202 makes the positioning between the first plastic part 200 and the connecting piece 400 accurate, facilitating assembly and improving the assembly accuracy of the battery cover plate.

[0068] Further, the sealing part 500 includes a first sealing part 510 and a second sealing part 520, the second sealing part 520 is connected to the first sealing part 510, the inner diameters of the first sealing part 510 and the second sealing part 520 are equal, the outer diameter of the first sealing part 510 is larger than that of the second sealing part 520, thereby forming a stepped part between the circumferential side wall of the second sealing part 520 and the end face of the first sealing part 510 away from the plate body 320, and the wall surface of the second mounting hole 201 on the cover plate body 100 is embedded in the stepped part. The gap between the plate body 320 and the cover plate body 100 is sealed by the first sealing part 510, and the gap between the column body 310 and the cover plate body 100 is sealed by the second sealing part 520. The width of the first sealing part 510 is B in the radial direction of the first mounting hole 411.

[0069] Continuing to refer to Figure 2 and Figure 5The battery cover plate further comprises a second plastic part 600 and a connecting block 700. The second plastic part 600 is arranged on the side of the cover plate body 100 away from the first plastic part 200, and the connecting block 700 is arranged on the side of the second plastic part 600 away from the cover plate body 100. The column part 310 of the pole column 300 comprises a first column 311 and a second column 312 connected to each other. The diameter of the first column 311 is smaller than that of the second column 312, and the second column 312 is connected to the plate part 320. The second plastic part 600 is provided with a fourth mounting hole 601, and the connecting block 700 is provided with a fifth mounting hole 701. The first column 311 of the pole column 300 passes through the first mounting hole 411 of the connecting sheet 400, the second mounting hole 201 of the first plastic part 200, the third mounting hole 101 of the cover plate body 100, the fourth mounting hole 601 of the second plastic part 600, and the fifth mounting hole 701 of the connecting block 700 in sequence, and is riveted with the connecting block 700, so as to realize the fixation of the pole column 300 on the cover plate body 100. Through the arrangement of the first plastic part 200 and the second plastic part 600, the pole column 300 is insulated from the cover plate body 100.

[0070] The embodiment also provides a battery comprising a shell, a pole group, and the above-mentioned battery cover plate. The shell is provided with an opening, the pole group is arranged in the shell through the opening, the tab or the pole piece of the pole group is welded with the second connecting plate 420 of the connecting sheet 400 in the battery cover plate, and the end of the shell provided with the opening is welded with the periphery of the cover plate body 100 of the battery cover plate, so as to encapsulate the pole group in the shell. The sealing performance and the insulation performance of the battery cover plate in the embodiment are good, and the safety and the reliability of the battery can be ensured.

[0071] The related size design of the above-mentioned battery cover plate is verified by some samples in specific implementation cases. First, the influence of the values of A, B and A / B on the sealing performance of the battery cover plate is explored, and details are shown in Table 1.

[0072] Table 1

[0073]

[0074] From the above results, it can be seen that the value range of the parameters A and B in Example 1 meets the corresponding size limit, but the value of A / B is too small. After the assembly of the battery cover plate, the pole column 300 cannot completely support the sealing element 500, the edge of the plate part 320 of the pole column 300 is raised, the sealing performance of the battery cover plate is poor, and it cannot pass the helium test. In addition, due to the small size of the plate part 320 of the pole column 300, the fixation of the pole column 300 on the cover plate body 100 may not be firm, and the pole column 300 may be easily pulled out, resulting in a poor product.

[0075] The value range of parameters A and B in Example 12 meets the corresponding size limit, but the value of A / B is too large. Although the sealing performance and reliability of the battery cover plate after assembly are good, the size of the plate body part 320 of the pole 300 is not reasonable, the size of the plate body part 320 of the pole 300 is too large, which increases the weight and cost of the pole 300, and the product is not good.

[0076] The value range of A, B, and A / B in Examples 2 to 11 and Examples 13 to 15 meets the corresponding size limit. After the battery cover plate is assembled, the edge of the plate body part 320 of the pole 300 is not raised, the pole 300 can well support the seal 500, the sealing performance of the battery cover plate is good, it can pass the helium test, and the size of the plate body part 320 of the pole 300 is large enough. The pole 300 is fixed firmly on the cover plate body 100, the pole 300 is not easy to fall out, the reliability is high, and the product is good.

[0077] The influence of the values of C and E on the reliability of the connecting piece 400 of the battery cover plate is explored below. For details, see Table 2.

[0078] Table 2

[0079]

[0080] As can be seen from the above results, the value of parameter C in Example 1 is less than the minimum value of its value range 1mm≤C≤16mm, and the value of E is less than the minimum value of its value range 1mm≤E≤16mm. The values of C and E are too small, the residual width of the connecting piece 400 around the first mounting hole 411 is narrow, and when the connecting piece 400 is repeatedly bent, the connecting piece 400 around the first mounting hole 411 is easy to break. The reliability of the battery cover plate after assembly is reduced, and the product is not good.

[0081] In Example 12, the value of parameter C is greater than the maximum value of its value range 1mm≤C≤16mm, and the value of E is greater than the maximum value of its value range 1mm≤E≤16mm. The values of C and E are too large, the size of the connecting piece 400 is not reasonable, the size of the connecting piece 400 is redundant, which is not conducive to the thinning of the battery cover plate, and the weight and cost are increased. The product is not good.

[0082] In Examples 2 to 11, the value range of C and E meets the corresponding size limit, the residual width of the connecting piece 400 around the first mounting hole 411 is wide, and when the connecting piece 400 is repeatedly bent, the connecting piece 400 around the first mounting hole 411 is not easy to break. The reliability of the battery cover plate after assembly is high, and the product is good.

[0083] The influence of the values of C, G1, C / G1, E, G2, and E / G2 on the insulation performance of the first plastic part 200 of the battery cover plate is explored below. For details, see Table 3.

[0084] Table 3

[0085]

[0086] From the above results, it can be seen that the value of the parameter C / G1 in Example 1 is less than the minimum value of the value range 1.5≤C / G1≤8.0, the value of E / G2 is less than the minimum value of the value range 1.5≤E / G2≤8.0, and the values of C / G1 and E / G2 are too small. After the welding of the pole 300 and the connecting piece 400, the welding portion 331 overflows the connecting piece 400, causing the first plastic part 200 to melt and deform, the insulation of the battery cover plate to fail, the safety of the assembled battery cover plate to decrease, and the product to be defective.

[0087] In Example 12, the value of the parameter C / G1 is greater than the maximum value of the value range 1.5≤C / G1≤8.0, the value of E / G2 is greater than the maximum value of the value range 1.5≤E / G2≤8.0, and the values of C / G1 and E / G2 are too large. At this time, after the welding of the pole 300 and the connecting piece 400, the welding portion 331 will not overflow the connecting piece 400, the first plastic part 200 does not melt and deform, the insulation performance of the battery cover plate is good, but the size of the connecting piece 400 is designed with excessive redundancy, which is not conducive to the lightness and thinness of the battery cover plate, causing an increase in weight and cost, and the product is defective.

[0088] In Examples 2 to 11 and Examples 13 to 15, the value range of C / G1 and E / G2 meets the corresponding size limit. At this time, after the welding of the pole 300 and the connecting piece 400, the welding portion 331 will not overflow the connecting piece 400, the first plastic part 200 does not melt and deform, the insulation performance of the battery cover plate is good, the size of the connecting piece 400 is reasonably designed, the battery cover plate is relatively light and thin, and the product is good.

[0089] Next, the influence of the values of H, H1, and H / H1 on the insulation performance of the first plastic part 200 of the battery cover plate is explored. For details, see Table 4.

[0090] Table 4

[0091]

[0092] From the above results, it can be seen that the value of the parameter H / H1 in Example 1 is less than the minimum value of the value range 0.2≤H / H1≤0.8, the value of H / H1 is too small, the penetration depth of the welding portion 331 after the welding of the pole 300 and the connecting piece 400 is too small, the connection strength of the welding portion 331 is weak, and the connecting piece 400 is prone to falling off the pole 300, the reliability of the battery cover plate is low, and the product is defective.

[0093] The value of the parameter H / H1 in Example 12 is greater than the maximum value of the value range 0.2≤H / H1≤0.8, the value of H / H1 is too large, the penetration of the welding portion 331 after the welding of the pole 300 and the connecting sheet 400 is too large, the molten pool generated during welding is too close to the first plastic part 200, the first plastic part 200 is prone to melt deformation, the risk of insulation failure of the battery cover plate is high, the safety of the assembled battery cover plate is reduced, and the product is defective.

[0094] The value range of H / H1 in Examples 2 to 11 and Examples 13 to 15 meets the corresponding size limit, at this time, the connection strength of the welding portion 331 after the welding of the pole 300 and the connecting sheet 400 is high, the pole 300 and the connecting sheet 400 are not prone to separation, the reliability is high, at the same time, the penetration of the welding portion 331 is not too large, the first plastic part 200 does not melt and deform, the insulation performance of the battery cover plate is good, and the product is good.

[0095] In summary, when the parameters A, B, A / B, C, G1, C / G1, E, G2, E / G2, H, H1 and H / H1 all meet the corresponding value range, the pole 300 can provide reliable support for the sealing element 500, the sealing performance of the battery cover plate is good, at the same time, the connection strength between the pole 300 and the connecting sheet 400 is high, and the first plastic part 200 does not melt and deform, the insulation performance is good, the reliability and safety of the battery cover plate are high, and the product is good.

[0096] Obviously, the above embodiments of the present application are only examples for clarity, and are not intended to limit the embodiments of the present application. Based on the above description, other different forms of changes or modifications can be made by those skilled in the art. Here, it is not necessary or possible to exhaust all embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A battery cover plate, characterized by, The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet.

2. The battery cover plate of claim 1, wherein, The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet.

3. The battery cover plate of claim 2, wherein, The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet.

4. The battery cover plate of claim 3, wherein, The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet.

5. The battery cover plate of claim 3, wherein, The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet.

6. The battery cover plate of claim 3, wherein, The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, a connecting sheet arranged on one side of the pole column close to the pole group, a sealing piece, and a first mounting hole provided on the connecting sheet. The utility model relates to a cover plate body, a first plastic piece arranged on one side of the cover plate body close to the pole group, a pole column, 7. The battery cover plate of claim 1, wherein, The sealing member comprises a first sealing part and a second sealing part, the second sealing part is connected to the first sealing part, the first sealing part is used for sealing the gap between the plate body part and the cover plate body, and the second sealing part is used for sealing the gap between the column body part and the cover plate body.

8. The battery cover plate of claim 7, wherein, The width of the first sealing part is B in the radial direction of the first mounting hole.

9. The battery cover plate of claim 1, wherein, The battery cover plate further comprises a second plastic part and a connecting block, the second plastic part is arranged on the side of the cover plate body away from the first plastic part, the connecting block is arranged on the side of the second plastic part away from the cover plate body, and the column body part of the pole column passes through the second plastic part and the connecting block and is riveted with the connecting block.

10. A battery, characterized by The battery cover plate comprises the battery cover plate according to any one of claims 1-9.

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