Battery cover plate and battery cell

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery cover plate and a battery cell, the battery cover plate comprises a cover plate body, the pole column assembly comprises a pole column body and a limiting piece, the pole column body is inserted into the pole column hole, the limiting piece is clamped with the pole column body in the thickness direction of the pole column body so as to be fixed, the limiting piece is made of a first material, and the part, clamped with the limiting piece, of the pole column body is made of a first conductive material; the hardness of the first material is greater than that of the first conductive material. According to the utility model, the limiting piece made of the high-hardness material is clamped in the thickness direction of the pole column body, so that the average hardness of the whole pole column assembly can still meet the requirement of an external welding electric connecting piece on the hardness of the pole column assembly under the condition that the thickness of the pole column assembly is reduced; therefore, the space utilization rate of the battery can be improved, namely the volume energy density of the battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field, concretely relates to a battery cover plate and electric core. BACKGROUND

[0002] The rapid development of new energy technology puts forward higher requirements to the electric core technology, especially improving the space utilization rate of the electric core, which is crucial to the improvement of the energy density of the electric core.In one scheme, the pole post assembly includes a riveting piece and a pole post body, and the riveting piece is directly riveted with the pole post body passing through the top cover, and the thickness of the riveting part is generally thick due to the influence of the pole post material, which leads to a high overall height of the pole post, and further occupies the internal space of the battery, affecting the energy density of the electric core. SUMMARY

[0003] In view of the above-mentioned defects of the prior art, the utility model aims at providing a battery cover plate and electric core which can reduce the height of the pole post and improve the energy density of the battery.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a battery cover plate, which comprises:

[0005] A cover plate body is provided with a pole post hole;

[0006] A pole post assembly comprises a pole post body and a limiting sheet, the pole post body is inserted into the pole post hole, the limiting sheet is clamped with the pole post body in the thickness direction of the pole post body to fix the limiting sheet, the limiting sheet is made of a first material, the part clamped between the pole post body and the limiting sheet is made of a first conductive material, and the hardness of the first material is greater than that of the first conductive material.

[0007] In an optional embodiment of the utility model, an insulating piece is further arranged between the cover plate body and the pole post assembly to insulate the pole post assembly from the cover plate body.

[0008] In an optional embodiment of the utility model, the insulating piece is an insulating ring, which covers the side wall of the pole post hole and the area close to the edge of the pole post hole on the inner and outer sides of the cover plate body.

[0009] The inner end of the pole post body is provided with a first flange, the first flange abuts against the inner end of the insulating ring, and the limiting sheet abuts against the outer end of the insulating ring.

[0010] In an optional embodiment of the utility model, the limiting sheet includes a clamping portion, a limiting portion and a connecting portion, the clamping portion is clamped with the side wall of the outer end of the pole body, the limiting portion is abutted with the outer end of the insulating ring, the clamping portion and the limiting portion are arranged at a distance apart in the thickness direction of the pole body, and the clamping portion is closer to the inner end of the pole body than the limiting portion, the clamping portion and the limiting portion are connected as a whole through the connecting portion.

[0011] In an optional embodiment of the utility model, the pole body includes a first section, a second section and a third section in turn from outside to inside along its thickness direction, wherein the side wall of the first section and the third section is protruded from the side wall of the second section, and the clamping portion is clamped between the edge of the first section and the edge of the third section.

[0012] In an optional embodiment of the utility model, the thickness of the clamping portion is h1, the thickness of the first section is H1, and the h1 and H1 satisfy:

[0013] h1 / H1≥1 / 3.

[0014] In an optional embodiment of the utility model, the thickness of the clamping portion is 0.1mm-3mm.

[0015] In an optional embodiment of the utility model, the distance between the end of the clamping portion close to the center of the pole body and the center of the pole body in the first direction is r11, the distance between the end of the clamping portion away from the center of the pole body and the center of the pole body in the first direction is r12, and the distance between the side wall of the first section and the center of the pole body in the first direction is R1, and the r11, r12 and R1 satisfy:

[0016] r11 / R1≤1, and / or

[0017] r12 / R1≥1.

[0018] The first direction is perpendicular to the thickness direction of the pole body.

[0019] In an optional embodiment of the utility model, the effective clamping length of the clamping portion is 0.3mm-10mm, and the effective clamping length refers to the length of the clamping portion clamped between the edge of the first section and the edge of the second section.

[0020] In an optional embodiment of the utility model, the distance between the side of the connecting part close to the pole body center and the pole body center in the first direction is r21, the distance between the side of the connecting part far from the pole body center and the pole body center in the first direction is r22, the distance between the side wall of the first section and the pole body center in the first direction is R1, the distance between the side wall of the third section and the pole body center in the first direction is R3, the r21, r22, R1, R3 satisfy:

[0021] r21 / R1≥1, and / or

[0022] r22 / R3≤2;

[0023] The first direction is perpendicular to the thickness direction of the pole body.

[0024] In an optional embodiment of the utility model, the thickness of the connecting part in the first direction is 0.1mm-3mm;The first direction is perpendicular to the thickness direction of the pole body.

[0025] In an optional embodiment of the utility model, the height of the connecting part in the thickness direction of the pole body is the sum of the thickness of the first section and the second section.

[0026] In an optional embodiment of the utility model, the height of the connecting part in the thickness direction of the pole body is 1mm-5mm.

[0027] In an optional embodiment of the utility model, the thickness of the limiting part is h3, the thickness of the first section is H1, the h3 and H1 satisfy:

[0028] h3 / H1≤1.

[0029] In an optional embodiment of the utility model, the thickness of the limiting part is 0.1mm-3mm.

[0030] In an optional embodiment of the utility model, the distance between the end of the limiting part close to the pole body center and the pole body center in the first direction is r31, the distance between the end of the limiting part far from the pole body center and the pole body center in the first direction is r32, the distance between the side wall of the first section and the pole body center in the first direction is R1, the r31, r32, R1 satisfy:

[0031] r31 / R1≥1, and / or

[0032] r32 / R1≤10;

[0033] The first direction is a direction perpendicular to the thickness direction of the pole body.

[0034] In an optional embodiment of the utility model, the effective abutting length of the limiting part is 1mm-10mm, the effective abutting length refers to the length of the abutting area of the limiting part with the insulating ring.

[0035] In an optional embodiment of the utility model, the outer end of the pole body is flush with the outer end of the limiting part or protrudes from the outer end of the limiting part.

[0036] In an optional embodiment of the utility model, the pole assembly is provided with two, wherein one of the pole assembly is the positive pole assembly, and the other pole assembly is the negative pole assembly; the inner end of the pole body of the negative pole assembly is at least partially made of a second conductive material.

[0037] In an optional embodiment of the utility model, the first conductive material extends to the inner side of the cover plate body, and the first conductive material extends to at least the outer end of the first flange, and the second conductive material wraps the inner side of the first conductive material.

[0038] In an optional embodiment of the utility model, a sealing ring is arranged between the first flange and the cover plate body, and the area of the first flange abutting against the sealing ring is made of a second conductive material, so that the inner side space of the battery cover plate and the first conductive material are isolated by the second conductive material and the sealing ring.

[0039] In an optional embodiment of the utility model, the inner end of the pole body is provided with a groove for accommodating the tab.

[0040] In an optional embodiment of the utility model, the inner side of the cover plate body is further provided with an insulating plate, the area corresponding to the pole assembly on the insulating plate is provided with a through hole, the pole body passes through the through hole and extends to the inner side of the insulating plate to form an extension part, the extension part is arranged in a spaced manner with the insulating plate and forms a clamping cavity for accommodating the tab between the extension part and the insulating plate.

[0041] In an optional embodiment of the utility model, the limiting sheet is an annular structure continuously distributed along the edge of the pole hole.

[0042] In an optional embodiment of the utility model, the first material is steel, and the first conductive material is aluminum.

[0043] In an optional embodiment of the utility model, the second conductive material is copper.

[0044] To achieve the above object and other related objects, the utility model provides a battery cover plate, including the battery cover plate, and electrode assembly and shell, the shell is connected with the battery cover plate to form the cavity for containing the electrode assembly, the electrode assembly is contained in the cavity, and the tab of electrode assembly is connected with the pole body electrically.

[0045] The technical effect of the utility model lies in: the utility model in the thickness direction of the pole body connects the limiting sheet made of high hardness material, because the material of the limiting sheet is harder than the material of the pole body, under the condition of meeting the same hardness requirement, the pole assembly with the limiting sheet can be thinner than the pole assembly without the limiting sheet, so that the average hardness of the whole pole assembly can still meet the hardness requirement of the external welding electric connection piece to the pole assembly under the condition of reducing the thickness of the pole assembly, because the overall height of the pole assembly is reduced, the space utilization of the battery can be improved, that is, the volume energy density of the battery is improved. BRIEF DESCRIPTION OF DRAWINGS

[0046] Figure 1 It is the perspective view of the battery cover plate provided by the embodiment of the utility model;

[0047] Figure 2 It is the exploded view of the battery cover plate provided by the embodiment of the utility model;

[0048] Figure 3 It is the top view of the battery cover plate provided by the embodiment of the utility model;

[0049] Figure 4 It is Figure 3 A-A sectional view of the;

[0050] Figure 5 It is Figure 4 I partial enlarged view of the;

[0051] Figure 6 It is Figure 4 Dimensional annotation view of the sectional view shown in the;

[0052] Figure 7 It is Figure 3 B-B sectional view of the;

[0053] Figure 8 It is the perspective view of the pole body provided by the embodiment of the utility model;

[0054] Figure 9 It is the perspective view of the limiting sheet provided by the embodiment of the utility model;

[0055] Figure 10 It is the sectional view of the battery cover plate provided by another embodiment of the utility model. DETAILED DESCRIPTION

[0056] The other advantages and effects of the present application can be easily understood by those skilled in the art from the contents disclosed in the present specification. The present application can also be implemented or applied in other different embodiments, and the details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0057] It should be noted that the diagrams provided in the following embodiments only schematically illustrate the basic concept of the present application, and only show the components related to the present application in the diagrams, not drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the component layout pattern can also be more complex.

[0058] In the description of the present application, "inner" and "outer" are based on the cavity of the battery, that is, the side or end close to the battery cavity is the inner side or end, and the side or end away from the battery cavity is the outer side or end.

[0059] Secondary batteries, also known as rechargeable batteries or energy storage batteries, refer to batteries that can be charged by external electric energy and release electric energy when needed. A secondary battery includes a shell, an electrode assembly and a cover plate, the electrode assembly is accommodated in the shell, the cover plate is connected with the shell to close the electrode assembly in the shell, the cover plate is generally provided with a pole post, the inner end of the pole post is connected with the tab of the battery cell, and the outer end of the pole post is exposed outside the cover plate for connecting external electric connectors such as bus bars. In one scheme, the pole post assembly includes a riveting piece and a pole post body, the riveting piece is directly riveted with the pole post body passing through the top cover. Due to the influence of the pole post material, the thickness of the riveting part is generally thick, resulting in a high overall height of the pole post, occupying the space inside the battery cell, and further affecting the energy density of the battery cell. Therefore, the utility model rivets a limiting sheet made of high-hardness material in the thickness direction of the pole post body. Since the material of the limiting sheet is harder than the material of the pole post body, the pole post assembly with the limiting sheet can be thinner than the pole post assembly without the limiting sheet under the condition of meeting the same hardness requirement. Thus, the overall average hardness of the pole post assembly can still meet the hardness requirement of the external welding electric connector to the pole post assembly under the condition of reducing the thickness of the pole post assembly. Since the overall height of the pole post assembly is reduced, the space utilization of the battery can be improved, that is, the volume energy density of the battery is improved. In addition, the negative pole post is generally processed by friction welding process to connect metals (generally copper and aluminum) of different materials into one body to meet the welding requirement of the bus bar and the tab. However, the copper-aluminum combination surface is directly stressed and has a separation risk, high cost and low production efficiency due to the influence of the processing process and the copper-aluminum combination interface form. Therefore, the outer metal of the pole post is extended to the inner side of the cover plate, and the limiting between the pole post and the inner side of the cover plate is realized by the outer metal, so as to avoid the direct stress on the combination surface between different metals and improve the reliability of the pole post.

[0060] Please refer to Figures 1-10 The technical scheme of the utility model will be described in detail below in combination with specific embodiments:

[0061] Please refer to Figures 1-4 , 10, the utility model discloses an embodiment of battery cover plate includes cover plate body 10, insulating piece and pole post assembly, the battery cover plate is used to form the cavity that contains battery cell 100 with shell (not shown in the drawing), and the pole post assembly is electrically connected with the tab 110 of battery cell 100, for guiding the input, output end of battery cell 100 to the outside of shell.

[0062] Please refer to Figure 2 , 4As shown, the cover plate body 10 is provided with a pole hole 11, in specific embodiments, the cover plate body 10 can be made of a metal material, for example, it can be an aluminum plate; the insulating piece is at least partially arranged between the cover plate body 10 and the pole assembly to insulate the pole assembly from the cover plate body 10, in specific embodiments, the insulating piece can include an insulating ring 20, the insulating ring 20 covers the side wall of the pole hole 11 and the area near the edge of the pole hole 11 on the inside and outside of the cover plate body 10, in specific embodiments, the material of the insulating ring 20 can be plastic; the pole assembly includes a pole body 30 and a limiting piece 40, the pole body 30 is inserted into the pole hole 11, the inner end of the pole body 30 is provided with a first flange 33, the first flange 33 abuts the inner end of the insulating ring 20; the limiting piece 40 is made of a first material, the conductivity of the first material is not limited, which can be a conductive material or an insulating material, at least the outer end of the pole body 30 is made of a first conductive material 31, the hardness of the first material is greater than that of the first conductive material 31, the limiting piece 40 is clamped with the pole body 30 in the thickness direction of the pole body 30, and the limiting piece 40 abuts the outer end of the insulating ring 20.

[0063] By arranging the insulating piece between the cover plate body 10 and the pole assembly, short circuit between the pole assembly and the cover plate body 10 can be effectively prevented; by ensuring electrical isolation between the pole assembly and the cover plate body 10, the safety risk caused by electrical contact is reduced.

[0064] The utility model discloses an integral insulating ring 20 covers the side wall of the pole hole 11 and the end face of the hole mouth, reduces the assembly gap, further improves the electrical isolation performance of the battery cover plate, in addition, the integral insulating ring 20 is more convenient for the assembly of the battery cover plate, and the production efficiency is improved. The material of the insulating ring 20 is flexible, which can be plastic and other materials. Such materials not only have good insulation performance, but also have good mechanical properties and environmental resistance, which enables the insulating piece to maintain stable working performance in different application environments.

[0065] The utility model discloses a limiting piece 40 made of high-hardness material is clamped in the thickness direction of the pole body 30, because the material of the limiting piece 40 is harder than that of the pole body 30, under the condition of meeting the same hardness requirement, the pole assembly with the limiting piece 40 can be thinner than the pole assembly without the limiting piece 40, so that the average hardness of the whole pole assembly can still meet the hardness requirement of the external welding electrical connecting piece to the pole assembly under the condition of reducing the thickness of the pole assembly. As the overall height of the pole assembly is reduced, the space utilization of the battery can be improved, that is, the volume energy density of the battery is improved.

[0066] Referring to Figure 5 , 9 In an optional embodiment of the utility model, the limiting sheet 40 includes a clamping portion 41, a limiting portion 43 and a connecting portion 42, the clamping portion 41 is clamped with the side wall of the outer end of the pole body 30, the limiting portion 43 is abutted with the outer end of the insulating ring 20, the clamping portion 41 and the limiting portion 43 are arranged at a distance apart in the thickness direction of the pole body 30, and the clamping portion 41 is closer to the inner end of the pole body 30 than the limiting portion 43; the clamping portion 41 and the limiting portion 43 are connected as a whole through the connecting portion 42. In a specific embodiment, the pole body 30 and the clamping portion 41 can be connected through riveting mode for example. The embodiment utilizes the position difference between the clamping portion 41 and the limiting portion 43 to transfer the riveting position of the pole body 30 to the area closer to the inner end of the pole body 30, which reduces the protruding height of the outer end of the pole body 30 while ensuring the riveting strength between the pole body 30 and the limiting sheet 40, and further improves the energy density of the battery. In addition, since one side of the limiting sheet 40 is abutted with the insulating ring 20 and the other side is abutted with the pole body 30, the insulating ring 20, the limiting sheet 40 and the pole body 30 can be stacked in sequence during assembly, thereby improving the assembly efficiency.

[0067] Referring to Figure 5 , 8 In an optional embodiment of the utility model, the pole body 30 includes a first section 311, a second section 312 and a third section 313 in sequence from outside to inside along the thickness direction of the pole body 30, wherein the side wall of the first section 311 and the third section 313 protrudes from the side wall of the second section 312; the clamping portion 41 is clamped between the edge of the first section 311 and the edge of the third section 313. It should be understood that the above-mentioned division of the area of the pole body 30 is only for the convenience of describing the cooperation relationship between the limiting sheet 40 and the pole body 30, and does not mean that the pole body 30 must have multiple independent structures. In a specific embodiment, the first section 311, the second section 312 and the third section 313 can be an integral structure for example, wherein the part of the first section 311 protruding from the side wall of the second section 312 can be formed through riveting mode. Specifically, the side wall of the first section 311 can not protrude from the side wall of the second section 312 before riveting of the pole body 30, at this time, the clamping portion 41 can be placed outside the second section 312, and then the first section 311 is riveted to press the outside of the clamping portion 41, realizing the stable connection between the limiting sheet 40 and the pole body 30.

[0068] Referring to Figure 6As shown in the optional embodiment of the utility model, the thickness of the clamping part 41 is h1, the thickness of the first section 311 is H1, the size of h1 is determined by the material of the limiting sheet 40 and the pole body 30, for example, when the limiting sheet 40 is a steel sheet and the outer end of the pole body 30 is aluminum, because the strength of steel is about 3 times that of aluminum, therefore when h1 and H1 satisfy h1 / H1≥1 / 3, the limiting sheet 40 can reach the same or exceed the strength of the first section 311. In the specific embodiment, the thickness h1 of the clamping part 41 can be 0.1mm-3mm.

[0069] Please refer to Figure 6 As shown in the optional embodiment of the utility model, the distance between the end of the clamping part 41 close to the center of the pole body 30 and the center of the pole body 30 in the first direction is r11, the first direction is the direction perpendicular to the thickness direction of the pole body 30, the distance between the end of the clamping part 41 away from the center of the pole body 30 and the center of the pole body 30 in the first direction is r12, the distance between the side wall of the first section 311 and the center of the pole body 30 in the first direction is R1, the r11, r12, R1 satisfy r11 / R1<1, r12 / R1≥1, so as to ensure that the edge of the first section 311 can sufficiently press the clamping part 41; in the specific embodiment, as shown in the figure, Figure 5 As shown in the optional embodiment of the utility model, the effective clamping length L1 of the clamping part 41 is 0.3mm-10mm, the effective clamping length L1 refers to the length of the clamping part 41 clamped between the edge of the first section 311 and the edge of the second section 312.

[0070] Please refer to Figure 6 As shown in the optional embodiment of the utility model, the distance between the side of the connecting part 42 close to the center of the pole body 30 and the center of the pole body 30 in the first direction is r21, the distance between the side of the connecting part 42 away from the center of the pole body 30 and the center of the pole body 30 in the first direction is r22, the distance between the side wall of the first section 311 and the center of the pole body 30 in the first direction is R1, the distance between the side wall of the third section 313 and the center of the pole body 30 in the first direction is R3, the r21, r22, R1, R3 satisfy r21 / R1≥1, r22 / R3≤2; while ensuring that the connecting part 42 has sufficient connecting strength, the thickness of the connecting part 42 is minimized. In the specific embodiment, the thickness of the connecting part 42 in the first direction is 0.1mm-3mm.

[0071] Please refer to Figure 6As shown in an optional embodiment of the utility model, the height h2 of the connecting part 42 in the thickness direction of the pole body 30 is the sum of the thicknesses of the first section 311 and the second section 312. In a specific embodiment, the height h2 of the connecting part 42 in the thickness direction of the pole body 30 is 1mm-5mm. It should be understood that setting h2 as the sum of the thicknesses of the first section 311 and the second section 312 can keep the outer end face of the pole assembly flat, which is more conducive to the connection between the pole assembly and the external electrical connector, such as welding with the busbar. Setting h2 as 1mm-5mm can minimize the protruding height of the pole assembly while ensuring the riveting strength.

[0072] Please refer to Figure 6 As shown in an optional embodiment of the utility model, the thickness of the limiting part 43 is h3, the thickness of the first section 311 is H1, and h3 / H1≤1. H1 can be understood as the effective riveting thickness required for the pole body 30 to achieve sufficient riveting strength, and h3 can be understood as the effective riveting thickness required for the limiting sheet 40 to achieve sufficient riveting strength. Since the material strength of the limiting sheet 40 is greater than that of the pole body 30, h3 can be set smaller to reduce the overall height of the pole assembly. In an optional embodiment of the utility model, the thickness of the limiting part 43 is 0.1mm-3mm. Setting h3 as 0.1-3mm can minimize the thickness of the limiting sheet 40 while ensuring the riveting strength, thereby reducing the protruding height of the pole assembly.

[0073] Please refer to Figure 6 As shown in an optional embodiment of the utility model, the distance between the end of the limiting part 43 close to the center of the pole body 30 and the center of the pole body 30 in the first direction is r31, the distance between the end of the limiting part 43 away from the center of the pole body 30 and the center of the pole body 30 in the first direction is r32, and the distance between the side wall of the first section 311 and the center of the pole body 30 in the first direction is R1. The r31, r32, and R1 satisfy r31 / R1≥1 and r32 / R1≤10, which ensures that the limiting part 43 is fully limited on the outside of the battery cover plate while avoiding material waste caused by the excessive length of the limiting part 43. Figure 5 As shown, the effective abutting length L2 of the limiting part 43 is 1mm-10mm, and the effective abutting length L2 refers to the length of the abutting area of the limiting part 43 and the insulating ring 20.

[0074] In an optional embodiment of the utility model, the outer end of the pole body 30 is flush with or protrudes from the outer end of the limiting portion 43, so as to facilitate subsequent welding between the pole body 30 and the busbar.

[0075] Please refer to Figure 1 , 3 , 4, 7, in an optional embodiment of the utility model, the pole assembly is provided with two, two pole assemblies are arranged on the cover plate body, wherein one of the pole assemblies is a positive pole assembly 301, and the other pole assembly is a negative pole assembly 302, the positive pole assembly 301 and the negative pole assembly 302 all include the limiting sheet 40, and the hardness of the limiting sheet 40 is greater than that of the pole body 30 of the positive pole assembly 301 and the pole body 30 of the negative pole assembly 302 at the same time, for example, the material of the pole body of the positive pole is aluminum, the pole body of the negative pole is at least aluminum at the outer end and copper at the inner end or is entirely copper, and the material of the limiting sheet is steel, so that the protruding height of the positive pole assembly 301 and the negative pole assembly 302 can be reduced at the same time due to the fact that the hardness of steel is greater than that of aluminum and copper at the same time; in the embodiment, the inner end of the pole body 30 of the negative pole assembly 302 is made of the second conductive material 32. It should be understood that the materials of the positive and negative tabs of the battery cell 100 are generally not the same, for example, the positive tab 110 is generally aluminum, and the negative tab 110 is generally copper, and welding between copper and aluminum is not easy to implement, so the inner end of the negative pole assembly 302 needs to be set to the same material as the negative tab 110, for example, a layer of copper material is arranged at the inner end of the negative pole assembly 302.

[0076] Please refer to Figure 4 , in an optional embodiment of the utility model, the first conductive material 31 extends to the inner side of the cover plate body 10, and the first conductive material 31 extends to at least the outer end of the first flange 33, and the second conductive material 32 wraps the inner side of the first conductive material 31. The outer metal of the pole body 30 extends to the inner side of the cover plate body 10 in the utility model, and the limiting between the pole assembly and the inner side of the cover plate body 10 is realized by using the outer metal, so that the bonding surface between different metals is avoided from being directly stressed, and the reliability of the pole body 30 is improved.

[0077] Please refer to Figure 4 , in an optional embodiment of the utility model, the first flange 33 and the cover plate body 10 are provided with a sealing ring 50, and the area of the first flange 33 abutting against the sealing ring 50 is made of the second conductive material 32, so that the inner side space of the battery cover plate and the first conductive material 31 are isolated by the second conductive material 32 and the sealing ring 50. In this way, primary cell corrosion can be avoided when the two different conductive materials are in contact with the electrolyte at the same time.

[0078] Please refer toFigure 2 , 4 As shown, in an optional embodiment of this utility model, an insulating plate 60 is further provided on the inner side of the cover plate body 10, and a through hole 61 is provided on the insulating plate 60 in the area corresponding to the electrode assembly; in a further embodiment, a groove (not shown) for accommodating the tab 110 is provided at the inner end of the electrode body 30. This allows the tab 110 to share part of the space with the electrode along the thickness direction of the electrode, reducing the overall height of the battery and further improving the volumetric energy density of the battery.

[0079] Please see Figure 10 As shown, in another optional embodiment of this utility model, the electrode post body 30 passes through the through hole 61 and extends to the inner side of the insulating plate 60 to form an extension 34. The extension 34 is spaced apart from the insulating plate 60 and forms a cavity between the extension 34 and the insulating plate 60 for accommodating the tab 110. This embodiment also allows the tab 110 and the electrode post assembly to share a thickness space. This embodiment is suitable for scenarios where the battery contains multiple cells 100.

[0080] Please see Figure 9 As shown, in an optional embodiment of this utility model, the limiting piece 40 is an annular structure continuously distributed along the edge of the pole hole 11. The annular limiting piece 40 can tightly wrap around the edge of the pole hole 11, providing all-round positioning support and ensuring the positional accuracy and stability of the pole assembly during installation; the continuously distributed annular structure can more accurately control the installation position and direction of the pole assembly, avoiding installation errors caused by insufficient local support; the annular limiting piece 40 is easier to position and fix during assembly, reducing assembly steps and time, and improving production efficiency; the annular structure of the limiting piece 40 can enhance the structural strength between the pole assembly and the cover plate body 10, and when subjected to external force, the annular structure can evenly distribute stress, avoiding local stress concentration, thereby improving the overall mechanical strength and durability; the annular limiting piece 40 can better seal the edge of the pole hole 11, playing a role in waterproofing and dustproofing. It should be understood that in some other embodiments, the limiting piece 40 can also be multiple independent structures spaced apart along the circumference of the pole.

[0081] The utility model also provides a kind of electric core, including the battery cover plate, and electrode assembly 100 and shell (not shown in drawing), the shell is connected with the battery cover plate, to form the cavity for containing the electrode assembly 100, the electrode assembly 100 is contained in the cavity, and the tab 110 of the electrode assembly 100 is electrically connected with the pole body 30.By using the above-mentioned design battery cover plate, the overall height of electric core can be effectively reduced under the condition of certain electric core capacity, after electric core is assembled into battery module or battery pack, the gap between each electric core is smaller, and then the overall energy density of battery module or battery pack can be improved.

[0082] Embodiment 2

[0083] The embodiment provides a cover plate body and an electric core comprising the cover plate body, which have substantially the same structure as the battery cover plate provided in Embodiment 1, except that in the embodiment, the shell comprises two cover plate bodies 10, and the positive pole assembly and the negative pole assembly are arranged on the two different cover plate bodies 10 respectively. The design of the two independent cover plate bodies 10 provides higher design and manufacturing flexibility, and manufacturers can flexibly adjust the positions and connection modes of the positive and negative pole assemblies according to different application requirements and performance specifications, customize different electric core products, and meet diversified market demands.

[0084] Embodiment 3

[0085] The embodiment provides a cover plate body and an electric core comprising the cover plate body, which have substantially the same structure as the battery cover plate provided in Embodiment 1, except that in the embodiment, one of the positive pole assembly and the negative pole assembly is arranged on the battery cover plate, and the other is arranged on the shell. Arranging the positive and negative pole assemblies on the battery cover plate and the shell respectively can better utilize the limited space, make the internal structure of the electric core more compact, and provide design flexibility at the same time. This layout helps to optimize the overall size and weight of the electric core, meets specific requirements of the size and weight of the electric core for different applications, and brings more diversity to the design of the electric core. Manufacturers can flexibly adjust the positions of the positive and negative pole assemblies according to specific application requirements and space limitations to meet specific performance and installation requirements.

[0086] In summary, the utility model discloses the thickness direction of pole body connects the limiting sheet made of high hardness material, because the material of limiting sheet is greater than the hardness of the material of pole body, under the condition of satisfying the same hardness requirement, the pole assembly of increasing limiting sheet can be thinner than the thickness of the pole assembly without increasing limiting sheet, thereby the scheme reduces the thickness of pole assembly, and the average hardness of pole assembly whole can still satisfy the hardness requirement of external welding electric connection piece to pole assembly, because the overall height of pole assembly is reduced, and then the space utilization of battery can be improved, that is, the volume energy density of battery is improved, the utility model discloses the outer layer metal of pole is extended to the inner side of cover plate, and utilizes outer layer metal to realize the limiting between pole and the inner side of cover plate, avoids the direct stress of the bonding surface between different metals, and improves the reliability of pole.

[0087] The above-mentioned embodiments only exemplarily illustrate the principles and effects of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

[0088] In the description herein, many specific details are provided, such as examples of components and / or methods, to provide a thorough understanding of embodiments of the application. Persons skilled in the art will recognize, however, that an embodiment of the application can be practiced without one or more of the specific details. In other instances, well-known structures, materials, or operations have not been shown or described in detail in order to avoid obscuring aspects of embodiments of the application.

Claims

1. A battery cover plate, characterized by, The cover plate body is provided with a pole hole; The pole assembly includes a pole body and a limiting sheet, the pole body is inserted into the pole hole, the limiting sheet is clamped with the pole body in the thickness direction of the pole body to fix the limiting sheet, the limiting sheet is made of a first material, the part clamped between the pole body and the limiting sheet is made of a first conductive material, and the hardness of the first material is greater than that of the first conductive material. Further comprising:

2. The battery cover plate of claim 1, wherein, An insulating piece is at least partially arranged between the cover plate body and the pole assembly to insulate the pole assembly from the cover plate body. The insulating piece is an insulating ring, which covers the side wall of the pole hole and the area near the edge of the pole hole on both sides of the cover plate body; 3. The battery cover plate of claim 2, wherein, The inner end of the pole body is provided with a first flange, the first flange abuts against the inner end of the insulating ring, and the limiting sheet abuts against the outer end of the insulating ring. The limiting sheet includes a clamping part, a limiting part and a connecting part, the clamping part is clamped with the side wall of the outer end of the pole body, the limiting part abuts against the outer end of the insulating ring, the clamping part and the limiting part are arranged at a distance in the thickness direction of the pole body, and the clamping part is closer to the inner end of the pole body than the limiting part; the clamping part and the limiting part are connected as a whole through the connecting part.

4. The battery cover plate of claim 3, wherein, The pole body includes a first section, a second section and a third section from outside to inside along the thickness direction of the pole body, wherein the side wall of the first section and the third section protrudes from the side wall of the second section; the clamping part is clamped between the edge of the first section and the edge of the third section.

5. The battery cover plate of claim 4, wherein, The thickness of the clamping part is h1, the thickness of the first section is H1, and h1 / H1≥1 / 3.

6. The battery cover plate of claim 5, wherein, The thickness of the clamping part is 0.1mm-3mm. The distance between the end of the clamping part close to the center of the pole body and the center of the pole body in the first direction is r11, the distance between the end of the clamping part away from the center of the pole body and the center of the pole body in the first direction is r12, and the distance between the side wall of the first section and the center of the pole body in the first direction is R1, and r11 / R1≤1.

7. The battery cover plate of claim 5, wherein, The first direction is perpendicular to the thickness direction of the pole body.

8. The battery cover plate of claim 5, wherein, The effective clamping length of the clamping part is 0.3mm-10mm, and the effective clamping length refers to the length of the clamping part clamped between the edge of the first section and the edge of the second section. ​ r12 / R1≥1； ​ 9. The battery cover plate of claim 5, wherein, ​ 10. The battery cover plate of claim 5, wherein, The distance between the side of the connecting portion close to the center of the pole body and the center of the pole body in the first direction is r21, the distance between the side of the connecting portion away from the center of the pole body and the center of the pole body in the first direction is r22, the distance between the side wall of the first section and the center of the pole body in the first direction is R1, the distance between the side wall of the third section and the center of the pole body in the first direction is R3, and the r21, r22, R1 and R3 satisfy: r21 / R1≥1, and / or r22 / R3≤2； The first direction is perpendicular to the thickness direction of the pole body.

11. The battery cover plate of claim 5, wherein, The thickness of the connecting portion in the first direction is 0.1mm-3mm; the first direction is perpendicular to the thickness direction of the pole body.

12. The battery cover plate of claim 5, wherein, The height of the connecting portion in the thickness direction of the pole body is the sum of the thicknesses of the first section and the second section.

13. The battery cover plate of claim 5, wherein, The height of the connecting portion in the thickness direction of the pole body is 1mm-5mm.

14. The battery cover plate of claim 5, wherein, The thickness of the limiting portion is h3, the thickness of the first section is H1, and the h3 and H1 satisfy: h3 / H1≤1.

15. The battery cover plate of claim 5, wherein, The thickness of the limiting portion is 0.1mm-3mm.

16. The battery cover plate of claim 5, wherein, The distance between the end of the limiting portion close to the center of the pole body and the center of the pole body in the first direction is r31, the distance between the end of the limiting portion away from the center of the pole body and the center of the pole body in the first direction is r32, the distance between the side wall of the first section and the center of the pole body in the first direction is R1, and the r31, r32 and R1 satisfy: r31 / R1≥1, and / or r32 / R1≤10； The first direction is perpendicular to the thickness direction of the pole body.

17. The battery cover plate of claim 5, wherein, The effective abutting length of the limiting portion is 1mm-10mm, which refers to the length of the abutting area of the limiting portion and the insulating ring.

18. The battery cover plate of claim 4, wherein, The outer end of the pole body is flush with or protrudes from the outer end of the limiting portion.

19. The battery cover plate of claim 3, wherein, The pole assembly is provided with two, one of which is a positive pole assembly, and the other is a negative pole assembly; the inner end of the pole body of the negative pole assembly is at least partially made of a second conductive material.

20. The battery cover plate of claim 19, wherein, The first conductive material extends to the inner side of the cover body, and the first conductive material extends to at least the outer end of the first flange, and the second conductive material wraps the inner side of the first conductive material.

21. The battery cover plate of claim 19, wherein, A sealing ring is arranged between the first flange and the cover body, and the area of the first flange in contact with the sealing ring is made of a second conductive material, so that the inner side space of the battery cover and the first conductive material are isolated by the second conductive material and the sealing ring.

22. The battery cover plate of claim 1, wherein, The inner end of the pole body is provided with a groove for accommodating a tab.

23. The battery cover plate of claim 1, wherein, The inner side of the cover plate body is further provided with an insulating plate, a through hole is formed in the area of the insulating plate corresponding to the pole post assembly, the pole post body passes through the through hole and extends to the inner side of the insulating plate to form an extension part, the extension part is spaced apart from the insulating plate and a clamping cavity for accommodating the tab is formed between the extension part and the insulating plate.

24. The battery cover plate of claim 1, wherein, The limiting sheet is an annular structure continuously distributed along the edge of the pole post hole.

25. The battery cover plate of any one of claims 1-24, wherein, The first material is steel, and the first conductive material is aluminum.

26. The battery cover plate of any one of claims 19, 20, 21, wherein, The second conductive material is copper.

27. An electrochemical cell, comprising: The battery cover plate, the electrode assembly and the shell are connected to form a cavity for accommodating the electrode assembly, the electrode assembly is accommodated in the cavity, and the tab of the electrode assembly is electrically connected with the pole post body.

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