Battery cover plate and battery

Abstract

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a cover plate body, a fixing assembly and a pole assembly, the fixing assembly comprises an insulation connecting piece, a positive riveting piece and a negative riveting piece, the positive riveting piece and the negative riveting piece are connected with the insulation connecting piece in an inserted mode, and the pole assembly comprises a positive pole and a negative pole. The positive pole comprises a first riveting part and a first limiting part, the first riveting part is eccentrically riveted on one side, deviating from the insulating connecting piece, of the positive riveting piece, the negative pole comprises a second riveting part and a second limiting part, and the second riveting part is eccentrically riveted on one side, deviating from the insulating connecting piece, of the negative riveting piece. The two sides of the positive electrode riveting piece and the two sides of the negative electrode riveting piece are fixed, so that the amplitude of structural deformation is reduced, it is guaranteed that the planeness size meets the set range, the attaching degree of a palladium sheet, the positive electrode riveting piece and the negative electrode riveting piece is high, and therefore the situation that due to explosion cavities and pseudo soldering in the welding process, the temperature rise of over-current at the welding printing position is too large, and the service life is prolonged is reduced. And thermal runaway and the like are caused.

Description

Technical Field

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

[0002] As an important part of a lithium battery, the structural design of the battery cover plate not only affects the basic performance of the battery, such as capacity and charge-discharge efficiency, but also is directly related to the safety and long-term reliability of the battery. The main structural components of the battery cover plate include a top cover sheet, positive and negative riveted aluminum blocks, positive and negative electrode posts, upper plastic parts, lower plastic parts, positive and negative seals and other components.

[0003] Among them, when riveting the positive and negative riveted aluminum blocks and the positive and negative electrode posts of the battery cover plate, the riveted blocks are prone to problems such as warping and deformation, resulting in the flatness dimension of the riveted blocks exceeding the set tolerance. When welding the palladium sheet, problems such as explosion holes and poor soldering are likely to occur, resulting in excessive current rise and temperature at the soldered mark, and in severe cases, adverse problems such as thermal runaway may occur. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery cover plate and a battery, in which the riveted blocks have a high flatness after riveting, small structural deformation, good fit with the palladium sheet, and a high welding yield.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] On the one hand, a battery cover plate is provided, and the battery cover plate includes:

[0007] A cover plate body;

[0008] A fixing component, the fixing component includes a positive electrode riveting piece, a negative electrode riveting piece and an insulating connecting piece. The positive electrode riveting piece and the negative electrode riveting piece are both arranged on the same side of the cover plate body along a first direction and are arranged at intervals along a second direction. A first convex platform is provided on the side of the positive electrode riveting piece facing the negative electrode riveting piece, and a second convex platform is provided on the side of the negative electrode riveting piece facing the positive electrode riveting piece. The insulating connecting piece is arranged between the positive electrode riveting piece and the negative electrode riveting piece. Limiting slots are opened on both sides of the insulating connecting piece along the second direction, and the first convex platform and the second convex platform are both inserted into the corresponding limiting slots;

[0009] The pole column assembly includes a positive pole column and a negative pole column. The positive pole column includes a first riveting portion and a first limiting portion. The first riveting portion passes through the cover plate body and is eccentrically riveted to the side of the positive pole riveting member away from the insulating connecting member, and the first limiting portion abuts against the side of the cover plate body away from the positive pole riveting member. The negative pole column includes a second riveting portion and a second limiting portion. The second riveting portion passes through the cover plate body and is eccentrically riveted to the side of the negative pole riveting member away from the insulating connecting member, and the second limiting portion abuts against the side of the cover plate body away from the negative pole riveting member;

[0010] The distance dimension between the surface of the first boss facing the insulating connecting member and the central axis of the first riveting portion along the second direction, and the distance dimension between the surface of the second boss facing the insulating connecting member and the central axis of the second riveting portion along the second direction are both Y. The thickness dimension of the wall surface of the limiting slot away from the cover plate body along the first direction is T1, and it satisfies where δ b is the tensile strength of the material used for the insulating connecting member.

[0011] Optionally, the distance dimension between the surface of the first boss facing the insulating connecting member and the central axis of the first riveting portion along the second direction, and the distance dimension between the surface of the second boss facing the insulating connecting member and the central axis of the second riveting portion along the second direction Y satisfy 20mm ≤ Y ≤ 50mm.

[0012] Optionally, the thickness dimension of the insulating connecting member between the two limiting slots along the second direction is a, and it satisfies 0.5 ≤ T1 / a ≤ 2.

[0013] Optionally, the thickness dimension of the wall surface of the limiting slot facing the cover plate body along the first direction is T2, and it satisfies 0.5 ≤ T2 / a ≤ 2.

[0014] Optionally, the thickness dimension T1 of the wall surface of the limiting slot away from the cover plate body along the first direction and the thickness dimension T2 of the wall surface of the limiting slot facing the cover plate body along the first direction satisfy T1 = T2.

[0015] Optionally, the thickness dimension a of the insulating connecting member between the two limiting slots along the second direction satisfies 0.7mm ≤ a ≤ 2mm.

[0016] Optionally, the cover plate body is provided with a positive through hole and a negative through hole spaced apart along the second direction, the positive rivet is provided with a first through hole connected to the positive through hole, the negative rivet is provided with a second through hole connected to the negative through hole, the width dimension of the cover plate body along the third direction is A, the diameter dimensions of the first through hole and the second through hole are both B, the width dimensions of the positive rivet and the negative rivet along the second direction are W, and 1.5mm≤(WB)≤(AB-4)mm are satisfied.

[0017] Optionally, the thickness of the positive electrode rivet and the negative electrode rivet along the first direction are both H, and satisfy 2.5 mm≤H≤4 mm.

[0018] Optionally, the insulating connector is made of PET, PPS, Al2O3 or ZrO2 material.

[0019] On the other hand, a battery is provided, comprising a pole group, a battery casing and a battery cover as described in any one of the above items, wherein the battery casing is a hollow shell structure with an opening, the battery cover is arranged on the opening of the battery casing and closes the battery casing to form a accommodating cavity for accommodating the pole group, the pole group comprises a positive pole ear and a negative pole ear, the positive pole ear is connected to the positive pole column, and the negative pole ear is connected to the negative pole column.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a battery cover plate, wherein the positive pole column is eccentrically riveted to the side of the positive pole riveted piece away from the insulating connector, the negative pole column is eccentrically riveted to the side of the negative pole riveted piece away from the insulating connector, and the first boss of the positive pole riveted piece and the second boss of the negative pole riveted piece are plugged into the insulating connector, so that the positive pole riveted piece is fixed on both sides along the second direction by the insulating connector and the positive pole column, and the negative pole riveted piece is fixed on both sides along the second direction by the insulating connector and the negative pole column, thereby greatly improving the riveting of the positive pole column with the positive pole riveted piece and the riveting of the negative pole column with the positive pole riveted piece. When the negative electrode rivet is riveted, the two ends of the positive electrode rivet and the negative electrode rivet are warped and deformed, which reduces the amplitude of structural deformation and ensures that the flatness dimension meets the set range. When welding the palladium sheet, the palladium sheet has a high degree of fit with the positive electrode rivet and the negative electrode rivet, thereby reducing the problems of excessive overcurrent temperature rise at the weld mark and thermal runaway caused by voids and cold welds during welding, and improving the welding yield. Different distance dimensions Y will result in different force values transmitted to the insulating connector, so the distance dimension Y and the thickness dimension T1 are limited to meet the requirements. , thereby ensuring that the insulating connector has sufficient fixing strength for the positive electrode rivet and the negative electrode rivet.

[0022] The present invention also provides a battery. By applying the above-mentioned battery cover plate, the reliability of the structure is not only improved, thus enhancing the basic performance, but also the adverse problems such as thermal runaway caused by poor welding are reduced, so that the battery has high safety in use. Brief Description of the Drawings

[0023] Figure 1 is an assembly drawing of the battery cover plate provided by the present invention;

[0024] Figure 2 is an exploded view of the structure of the battery cover plate provided by the present invention;

[0025] Figure 3 is a top view of the battery cover plate provided by the present invention;

[0026] Figure 4 is Figure 3 a structural sectional view along the I-I direction in

[0027] Figure 5 is Figure 4 an enlarged view of the structure of part F in

[0028] Figure 6 is Figure 3 a structural sectional view along the II-II direction in

[0029] Figure 7 is a schematic structural view of the cover plate body in the battery cover plate provided by the present invention;

[0030] Figure 8 is an exploded view of the structure of the fixing component in the battery cover plate provided by the present invention;

[0031] Figure 9 is a metallographic diagram of the battery cover plate provided by the present invention without adverse problems after palladium sheet welding;

[0032] Figure 10 is a metallographic diagram of the battery cover plate provided by the present invention with adverse problems after palladium sheet welding.

[0033] In the figure:

[0034] 1. Cover plate body; 11. First installation groove; 12. Installation hole; 13. Positive electrode through hole; 14. Negative electrode through hole;

[0035] 2. Fixing component; 21. Positive electrode riveting part; 211. First boss; 212. First through hole; 22. Negative electrode riveting part; 221. Second boss; 222. Second through hole; 23. Insulating connecting part; 231. Limit slot;

[0036] 3. Pole assembly; 31. Positive pole; 311. First riveting part; 312. First limiting part; 32. Negative pole; 321. Second riveting part; 322. Second limiting part;

[0037] 4. Upper insulating part; 41. Second installation groove;

[0038] 5. Lower insulating part; 6. Positive pole seal; 7. Negative pole seal; 8. Explosion-proof valve; 9. Protection patch. Specific embodiments

[0039] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that for the convenience of description, only parts related to the present invention are shown in the drawings, rather than all the structures.

[0040] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0041] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include that the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0042] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for differentiation in description and do not have special meanings.

[0043] Such as Figures 1 to 8As shown, the battery cover includes a cover body 1, a fixing assembly 2 and a pole assembly 3, the fixing assembly 2 includes a positive rivet 21, a negative rivet 22 and an insulating connector 23, the positive rivet 21 and the negative rivet 22 are both arranged on the same side of the cover body 1 along the first direction, and are spaced apart along the second direction, a first boss 211 is provided on the side of the positive rivet 21 facing the negative rivet 22, a second boss 221 is provided on the side of the negative rivet 22 facing the positive rivet 21, the insulating connector 23 is arranged between the positive rivet 21 and the negative rivet 22, and limiting slots 231 are provided on both sides of the insulating connector 23 along the second direction, and the first boss 211 and the second boss 221 are respectively inserted into the corresponding limiting slots 231. The pole assembly 3 includes a positive pole 31 and a negative pole 32. The positive pole 31 includes a first riveted portion 311 and a first limiting portion 312. The first riveted portion 311 passes through the cover body 1 and is eccentrically riveted to the positive pole riveted member 21 away from the insulating connector 23. The first limiting portion 312 abuts against the side of the cover body 1 away from the positive pole riveted member 21. The negative pole 32 includes a second riveted portion 321 and a second limiting portion 322. The second riveted portion 321 passes through the cover body 1 and is eccentrically riveted to the negative pole riveted member 22. On the side away from the insulating connector 23, the second limiting portion 322 abuts against the side of the cover body 1 away from the negative rivet 22, the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first rivet 311 along the second direction and the distance dimension between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second rivet 321 along the second direction are both Y, the thickness dimension of the wall surface of the limiting slot 231 away from the cover body 1 along the first direction is T1, and meets where δ b It is the tensile strength of the material used for the insulating connector 23.

[0044] The battery cover plate eccentrically rivets the positive electrode post 31 to the side of the positive electrode riveting part 21 away from the insulating connecting part 23, eccentrically rivets the negative electrode post 32 to the side of the negative electrode riveting part 22 away from the insulating connecting part 23, and inserts the first boss 211 of the positive electrode riveting part 21 and the second boss 221 of the negative electrode riveting part 22 into the insulating connecting part 23. Thus, the insulating connecting part 23 and the positive electrode post 31 are used to fix both sides of the positive electrode riveting part 21 along the second direction, and the insulating connecting part 23 and the negative electrode post 32 are used to fix both sides of the negative electrode riveting part 22 along the second direction. Thereby, when the positive electrode post 31 is riveted to the positive electrode riveting part 21 and when the negative electrode post 32 is riveted to the negative electrode riveting part 22, the situation that both ends of the positive electrode riveting part 21 and the negative electrode riveting part 22 are warped and deformed is greatly improved, the amplitude of structural deformation is reduced, and the flatness dimension is ensured to meet the set range. When welding the palladium sheet, the palladium sheet has a high degree of fit with the positive electrode riveting part 21 and the negative electrode riveting part 22. Thus, problems such as overcurrent temperature rise at the welding mark and thermal runaway caused by explosion holes and poor soldering during welding are reduced, the welding yield is improved, and since different distance dimensions Y will result in different force values transmitted to the insulating connecting part 23, the distance dimension Y and the thickness dimension T1 are limited to satisfy the limitation, thereby ensuring that the insulating connecting part 23 has sufficient fixing strength for the positive electrode riveting part 21 and the negative electrode riveting part 22.

[0045] In this embodiment, the distance dimension between the surface of the positive electrode riveting part 21 away from the insulating connecting part 23 and the central axis of the first riveting part 311 along the second direction and the distance dimension between the surface of the negative electrode riveting part 22 away from the insulating connecting part 23 and the central axis of the second riveting part 321 along the second direction are both Z, and Z < Y is satisfied, thereby ensuring that the first riveting part 311 is eccentrically riveted to the side of the positive electrode riveting part 21 away from the insulating connecting part 23, and the second riveting part 321 is eccentrically riveted to the side of the negative electrode riveting part 22 away from the insulating connecting part 23. The insulating connecting part 23 is used on the one hand to connect the positive electrode riveting part 21 and the negative electrode riveting part 22 into one body, and on the other hand to insulate the positive electrode riveting part 21 and the negative electrode riveting part 22 to ensure the insulation between the two. Therefore, the insulating connecting part 23 is usually prepared from materials such as PET, PPS, Al2O3 or ZrO2. In this embodiment, the insulating connecting part 23 is prepared from PPS material and is directly injection-molded between the positive electrode riveting part 21 and the negative electrode riveting part 22 by an injection molding process, so that the positive electrode riveting part 21, the negative electrode riveting part 22 and the insulating connecting part 23 form an integral structural part.

[0046] In this embodiment, as Figure 2As shown, in addition to the cover body 1, the fixing component 2, and the pole column component 3, the battery cover plate further includes an upper insulating part 4, a lower insulating part 5, a positive sealing part 6, and a negative sealing part 7. As Figure 7 shown, a first installation groove 11 is formed on the end face of the cover body 1 where the positive riveting part 21 and the negative riveting part 22 are provided. The upper insulating part 4 is arranged in the first installation groove 11, so as to position and limit the upper insulating part 4 and ensure the accuracy of the installation position of the upper insulating part 4. A second installation groove 41 is formed on the side of the upper insulating part 4 facing away from the cover body 1. After the positive riveting part 21 and the negative riveting part 22 are connected through the insulating connecting part 23, they are accommodated in the second installation groove 41. On the one hand, it positions and limits the positive riveting part 21 and the negative riveting part 22 connected into one body through the insulating connecting part 23. On the other hand, it isolates the positive riveting part 21 and the negative riveting part 22 from the cover body 1 by using the upper insulating part 4 to ensure insulation and avoid short circuit caused by direct connection between the positive riveting part 21 and the negative riveting part 22 and the cover body 1. The lower insulating part 5 is arranged on the side of the cover body 1 facing away from the upper insulating part 4, and the lower insulating part 5 covers the entire end face of the cover body 1 on the side facing away from the upper insulating part 4, so as to ensure the insulation of the side of the cover body 1 facing away from the upper insulating part 4 and avoid miscontact between the pole ear of the pole group and the cover body 1, resulting in a short circuit problem. Since the structures and connection methods of the positive pole column 31 and the negative pole column 32 are the same, taking the installation of the positive pole column 31 as an example, when installing the positive pole column 31, the first riveting part 311 of the positive pole column 31 sequentially passes through the lower insulating part 5, the cover body 1, and the upper insulating part 4, and is inserted into the positive riveting part 21. At this time, the lower insulating part 5 is clamped between the first limiting part 312 and the cover body 1, and finally the positive pole column 31 and the positive riveting part 21 are riveted to complete the assembly of the positive pole column 31. In order to ensure the sealing performance of the battery cover plate, a positive sealing part 6 and a negative sealing part 7 are respectively sleeved on the first riveting part 311 of the positive pole column 31 and the second riveting part 321 of the negative pole column 32, so as to block the gaps between the first riveting part 311 and the second riveting part 321 and other components to achieve sealing and avoid leakage of the electrolyte. In addition, the battery cover plate also needs to have the function of pressure relief and protection. Therefore, the battery cover plate further includes an explosion-proof valve 8. An installation hole 12 is formed on the cover body 1, and the explosion-proof valve 8 is installed in the installation hole 12, and a protection patch 9 is arranged above the explosion-proof valve 8 to protect the explosion-proof valve 8.

[0047] Optionally, as Figure 4 and Figure 5As shown in the figure, the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting portion 311 in the second direction, and the distance dimension Y between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting portion 321 in the second direction satisfy 20mm ≤ Y ≤ 50mm. By limiting the distance dimension Y, on the one hand, it avoids the distance dimension Y being too small, resulting in too close a spacing between the first riveting portion 311 and the second riveting portion 321, leading to insufficient space for welding the palladium sheet. On the other hand, it avoids the distance dimension Y being too large, resulting in too large a structural dimension of the positive electrode riveting member 21 and the negative electrode riveting member 22, with material redundancy and unnecessary cost increase. In this embodiment, the distance dimension Y can be any value between 20mm and 50mm or the range between any two values, such as 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, etc.

[0048] In this embodiment, in order to determine the relationship between the distance dimension Y and the thickness dimension T1 and the influence of the insulating connector 23 on the fixing strength of the positive electrode riveting member 21 and the negative electrode riveting member 22, as shown in Table 1, four sets of embodiments and six sets of comparative examples are provided for verification. On the one hand, it is observed whether the insulating connector 23 cracks after riveting. On the other hand, the flatness of the positive electrode riveting member 21 and the negative electrode riveting member 22 after riveting is measured. If the flatness is less than 0.2mm, the flatness meets the requirements. If the flatness is greater than 0.2mm, the flatness does not meet the requirements. After riveting is completed, the palladium sheet is welded, and the welding condition of the palladium sheet is observed. Since the insulating connector 23 is prepared from PPS material, the value of δ b is 105MPa.

[0049] Table 1

[0050]

[0051] In Embodiment 1, the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting portion 311 in the second direction, and the distance dimension Y between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting portion 321 in the second direction are set to Y = 20mm. At this time, the range requirement of 20mm ≤ Y ≤ 50mm is satisfied. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set to 0.8mm. After calculation, the relational expression is satisfied With regard to the defined requirements, after riveting the positive electrode post 31 and the positive electrode riveting part 21, as well as the negative electrode post 32 and the negative electrode riveting part 22, no cracking was found in the insulating connecting part 23. And through measurement, the flatness of the positive electrode riveting part 21 and the negative electrode riveting part 22 is 0.098 mm, which is less than 0.2 mm. Therefore, both the strength of the insulating connecting part 23 and the flatness after riveting are qualified. And on the premise of avoiding material redundancy, enough space is reserved for welding with the palladium sheet. After riveting is completed, the palladium sheet is welded. Through metallographic inspection, no problems such as explosion holes and false soldering occur between the positive electrode riveting part 21 and the negative electrode riveting part 22.

[0052] In Embodiment 2, the distance dimension between the surface of the first boss 211 facing the insulating connecting part 23 and the central axis of the first riveting part 311 in the second direction, and the distance dimension between the surface of the second boss 221 facing the insulating connecting part 23 and the central axis of the second riveting part 321 in the second direction are set as Y = 30 mm. At this time, the range requirement of 20 mm ≤ Y ≤ 50 mm is satisfied. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set as 0.6 mm. After calculation, the relational expression With regard to the defined requirements, after riveting the positive electrode post 31 and the positive electrode riveting part 21, as well as the negative electrode post 32 and the negative electrode riveting part 22, no cracking was found in the insulating connecting part 23. And through measurement, the flatness of the positive electrode riveting part 21 and the negative electrode riveting part 22 is 0.121 mm, which is less than 0.2 mm. Therefore, both the strength of the insulating connecting part 23 and the flatness after riveting are qualified. And on the premise of avoiding material redundancy, enough space is reserved for welding with the palladium sheet. After riveting is completed, the palladium sheet is welded. Through metallographic inspection, no problems such as explosion holes and false soldering occur between the positive electrode riveting part 21 and the negative electrode riveting part 22.

[0053] In Embodiment 3, the distance dimension between the surface of the first boss 211 facing the insulating connecting part 23 and the central axis of the first riveting part 311 in the second direction, and the distance dimension between the surface of the second boss 221 facing the insulating connecting part 23 and the central axis of the second riveting part 321 in the second direction are set as Y = 40 mm. At this time, the range requirement of 20 mm ≤ Y ≤ 50 mm is satisfied. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set as 0.5 mm. After calculation, the relational expression According to the limiting requirements, after riveting the positive terminal 31 and the positive riveting part 21, and the negative terminal 32 and the negative riveting part 22, no cracking occurred in the insulating connecting piece 23. And after measurement, the flatness of the positive riveting part 21 and the negative riveting part 22 is 0.113 mm, which is less than 0.2 mm. Therefore, both the strength of the insulating connecting piece 23 and the flatness after riveting are qualified. And on the premise of avoiding material redundancy, enough space is reserved for welding with the palladium sheet. After riveting is completed, the palladium sheet is welded. Through metallographic inspection, no problems such as explosion holes or false soldering occurred between the positive riveting part 21 and the negative riveting part 22.

[0054] In Embodiment 4, the distance dimension in the second direction between the surface of the first boss 211 facing the insulating connecting piece 23 and the central axis of the first riveting part 311, and the distance dimension Y in the second direction between the surface of the second boss 221 facing the insulating connecting piece 23 and the central axis of the second riveting part 321 are set to be 50 mm. At this time, the range requirement of 20 mm ≤ Y ≤ 50 mm is satisfied. The thickness dimension T1 in the first direction of the wall surface of the limiting slot 231 facing away from the cover body 1 is set to be 0.4 mm. After calculation, the relational expression According to the limiting requirements, after riveting the positive terminal 31 and the positive riveting part 21, and the negative terminal 32 and the negative riveting part 22, no cracking occurred in the insulating connecting piece 23. And after measurement, the flatness of the positive riveting part 21 and the negative riveting part 22 is 0.115 mm, which is less than 0.2 mm. Therefore, both the strength of the insulating connecting piece 23 and the flatness after riveting are qualified. And on the premise of avoiding material redundancy, enough space is reserved for welding with the palladium sheet. After riveting is completed, the palladium sheet is welded. Through metallographic inspection, no problems such as explosion holes or false soldering occurred between the positive riveting part 21 and the negative riveting part 22.

[0055] It can be seen from Embodiment 1 to Embodiment 4 that when the distance dimension in the second direction between the surface of the first boss 211 facing the insulating connecting piece 23 and the central axis of the first riveting part 311, and the distance dimension Y in the second direction between the surface of the second boss 221 facing the insulating connecting piece 23 and the central axis of the second riveting part 321 satisfy the range requirement of 20 mm ≤ Y ≤ 50 mm, and the thickness dimension T1 in the first direction of the wall surface of the limiting slot 231 facing away from the cover body 1 satisfies the relational expression According to the limiting requirements, no cracking occurred in the insulating connecting piece 23 after riveting, and the flatness of both the positive riveting part 21 and the negative riveting part 22 is also less than 0.2 mm. Therefore, when the above conditions are met, both the strength of the insulating connecting piece 23 and the flatness of the positive riveting part 21 and the negative riveting part 22 after riveting are qualified, and enough space is reserved for welding with the palladium sheet. At this time, when the palladium sheet is welded to the positive riveting part 21 and the negative riveting part 22, the degree of fitting is relatively high. As Figure 9 shown, no welding problems such as explosion holes or false soldering occurred after welding.

[0056] In Comparative Example 1, the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting portion 311 in the second direction and the distance dimension between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting portion 321 in the second direction are set as Y = 5 mm. At this time, the range requirement of 20 mm ≤ Y ≤ 50 mm is not satisfied. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set as 0.2 mm. After calculation, the limiting requirement of the relational expression is not satisfied. At this time, after riveting the positive electrode column 31 and the positive electrode riveting member 21 and the negative electrode column 32 and the negative electrode riveting member 22, it is found that the insulating connector 23 cracks. And after measurement, the flatness of the positive electrode riveting member 21 and the negative electrode riveting member 22 is 0.355 mm, which is greater than 0.2 mm. Therefore, both the strength of the insulating connector 23 and the flatness after riveting are unqualified. And due to the too small distance dimension Y, the space for welding with the palladium sheet is insufficient, and the welding operation of the palladium sheet cannot be carried out.

[0057] In Comparative Example 2, the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting portion 311 in the second direction and the distance dimension between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting portion 321 in the second direction are set as Y = 10 mm. At this time, the range requirement of 20 mm ≤ Y ≤ 50 mm is not satisfied. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set as 0.3 mm. After calculation, the limiting requirement of the relational expression is not satisfied. At this time, after riveting the positive electrode column 31 and the positive electrode riveting member 21 and the negative electrode column 32 and the negative electrode riveting member 22, it is found that the insulating connector 23 cracks. And after measurement, the flatness of the positive electrode riveting member 21 and the negative electrode riveting member 22 is 0.416 mm, which is greater than 0.2 mm. Therefore, both the strength of the insulating connector 23 and the flatness after riveting are unqualified. And due to the too small distance dimension Y, the space for welding with the palladium sheet is insufficient, and the welding operation of the palladium sheet cannot be carried out.

[0058] In Comparative Example 3, the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting portion 311 in the second direction and the distance dimension between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting portion 321 in the second direction are set as Y = 15 mm. At this time, the range requirement of 20 mm ≤ Y ≤ 50 mm is not satisfied. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set as 0.5 mm. After calculation, the limiting requirement of the relational expression According to the limiting requirements, after riveting the positive electrode post 31 and the positive electrode riveting part 21, and the negative electrode post 32 and the negative electrode riveting part 22, it is found that the insulating connecting part 23 cracks. And after measurement, the flatness of the positive electrode riveting part 21 and the negative electrode riveting part 22 is 0.347 mm, which is greater than 0.2 mm. Therefore, both the strength of the insulating connecting part 23 and the flatness after riveting are unqualified. And due to the too small distance dimension Y, there is insufficient space for welding the palladium sheet, and the welding operation of the palladium sheet cannot be carried out.

[0059] It can be seen from Comparative Example 1 to Comparative Example 3 that because the distance dimension between the surface of the first boss 211 facing the insulating connecting part 23 and the central axis of the first riveting part 311 in the second direction, and the distance dimension between the surface of the second boss 221 facing the insulating connecting part 23 and the central axis of the second riveting part 321 in the second direction Y and the thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction do not satisfy the relationship formula According to the limiting requirements, the strength of the insulating connecting part 23 cannot effectively block the tendency of the positive electrode riveting part 21 and the negative electrode riveting part 22 to warp and deform, resulting in cracking of the insulating connecting part 23. And because the positive electrode riveting part 21 and the negative electrode riveting part 22 have warped and deformed, their flatness is greater than 0.2 mm. Therefore, both the strength of the insulating connecting part 23 and the flatness after riveting are unqualified. And because the distance dimension between the surface of the first boss 211 facing the insulating connecting part 23 and the central axis of the first riveting part 311 in the second direction, and the distance dimension between the surface of the second boss 221 facing the insulating connecting part 23 and the central axis of the second riveting part 321 in the second direction Y is less than the minimum value of 20 mm ≤ Y ≤ 50 mm, the distance between the first riveting part 311 and the second riveting part 321 is too close, resulting in insufficient space for welding the palladium sheet, and the welding operation of the palladium sheet cannot be carried out.

[0060] In Comparative Example 4, the distance dimension between the surface of the first boss 211 facing the insulating connecting part 23 and the central axis of the first riveting part 311 in the second direction, and the distance dimension between the surface of the second boss 221 facing the insulating connecting part 23 and the central axis of the second riveting part 321 in the second direction Y = 60 mm are set. At this time, it does not meet the range requirement of 20 mm ≤ Y ≤ 50 mm. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set to 0.2 mm. After calculation, it does not meet the relationship formula According to the limiting requirements, after riveting the positive electrode post 31 and the positive electrode riveting part 21, and the negative electrode post 32 and the negative electrode riveting part 22, it is found that the insulating connecting part 23 cracks. And after measurement, the flatness of the positive electrode riveting part 21 and the negative electrode riveting part 22 is 0.351 mm, which is greater than 0.2 mm. Therefore, both the strength of the insulating connecting part 23 and the flatness after riveting are unqualified. And due to the too large distance dimension Y, there is material redundancy in both the positive electrode riveting part 21 and the negative electrode riveting part 22.

[0061] As can be seen from Comparative Example 4, since the relationship between the distance dimension Y and the thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction does not satisfy the relational expression the strength of the insulating connector 23 cannot effectively block the tendency of the positive riveting member 21 and the negative riveting member 22 to warp and deform, resulting in cracking of the insulating connector 23. And because the positive riveting member 21 and the negative riveting member 22 have warped and deformed, the flatness thereof is greater than 0.2 mm. Therefore, both the strength of the insulating connector 23 and the flatness after riveting are unqualified. Among them, since the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting portion 311 in the second direction and the distance dimension between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting portion 321 in the second direction Y is greater than the maximum value of 20 mm ≤ Y ≤ 50 mm, the palladium sheet has sufficient welding space. Therefore, on the basis of not satisfying the relational expression welding is carried out, as shown in Figure 10 Through metallographic inspection, problems such as explosion cavities and false soldering appear between the positive riveting member 21 and the negative riveting member 22. However, because the distance dimension Y is greater than the maximum value of 20 mm ≤ Y ≤ 50 mm, the structural dimensions of the positive riveting member 21 and the negative riveting member 22 are increased, resulting in material redundancy and unnecessary cost increase.

[0062] In Comparative Example 5, the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting portion 311 in the second direction and the distance dimension between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting portion 321 in the second direction are set as Y = 55 mm. At this time, it does not meet the range requirement of 20 mm ≤ Y ≤ 50 mm. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set as 0.3 mm. After calculation, it meets the limiting requirement of the relational expression After riveting the positive electrode column 31 and the positive riveting member 21 and the negative electrode column 32 and the negative riveting member 22, no cracking of the insulating connector 23 is found. And through measurement, the flatness of the positive riveting member 21 and the negative riveting member 22 is 0.120 mm, which is less than 0.2 mm. Therefore, both the strength of the insulating connector 23 and the flatness after riveting are qualified. However, due to the excessive distance dimension Y, there is material redundancy in the positive riveting member 21 and the negative riveting member 22.

[0063] As can be seen from Comparative Example 5, since the relationship between the distance dimension Y and the thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction satisfies the relational expression The limiting requirements result in the strength of the insulating connector 23 being able to effectively block the tendency of the positive riveting part 21 and the negative riveting part 22 to warp and deform, thus avoiding cracking of the insulating connector 23. And because the positive riveting part 21 and the negative riveting part 22 do not warp and deform, the flatness is less than 0.2 mm. Therefore, the strength of the insulating connector 23 and the flatness after riveting are both qualified. Among them, due to the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting part 311 in the second direction and the distance dimension Y between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting part 321 in the second direction being greater than the maximum value of 20 mm ≤ Y ≤ 50 mm, the palladium sheet has sufficient welding space. Therefore, on the basis of satisfying the relational expression welding is carried out. Through metallographic inspection, no problems such as explosion holes and false soldering occur between the positive riveting part 21 and the negative riveting part 22. However, because the distance dimension Y is greater than the maximum value of 20 mm ≤ Y ≤ 50 mm, the structural dimensions of the positive riveting part 21 and the negative riveting part 22 are increased, resulting in material redundancy and unnecessary cost increase.

[0064] In Comparative Example 6, the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting part 311 in the second direction and the distance dimension Y between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting part 321 in the second direction are set to Y = 30 mm. At this time, the range requirement of 20 mm ≤ Y ≤ 50 mm is satisfied. The thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction is set to 0.4 mm. After calculation, the relational expression is not satisfied. At this time, after riveting the positive electrode column 31 and the positive riveting part 21 and the negative electrode column 32 and the negative riveting part 22, it is found that the insulating connector 23 cracks. And after measurement, the flatness of the positive riveting part 21 and the negative riveting part 22 is 0.351 mm, which is greater than 0.2 mm. Therefore, the strength of the insulating connector 23 and the flatness after riveting are both unqualified. However, because the distance dimension Y meets the requirements, while providing sufficient space for palladium sheet welding, material redundancy is avoided.

[0065] It can be seen from Comparative Example 6 that because the relationship between the distance dimension Y and the thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction does not satisfy the relational expression The limiting requirements result in the inability of the insulating connector 23 to effectively resist the tendency of the positive riveting part 21 and the negative riveting part 22 to warp and deform, thus avoiding cracking of the insulating connector 23. And since the positive riveting part 21 and the negative riveting part 22 do not warp or deform, the flatness is greater than 0.2 mm. Therefore, both the strength of the insulating connector 23 and the flatness after riveting are unqualified. However, since the distance dimension between the surface of the first boss 211 facing the insulating connector 23 and the central axis of the first riveting part 311 in the second direction and the distance dimension Y between the surface of the second boss 221 facing the insulating connector 23 and the central axis of the second riveting part 321 in the second direction satisfy the requirement of 20 mm ≤ Y ≤ 50 mm, while providing sufficient space for the welding of the palladium sheet, material redundancy is avoided. Therefore, on the basis of not satisfying the relational expression for welding, through metallographic inspection, as Figure 10 shown, problems such as explosion holes and poor soldering occur between the positive riveting part 21 and the negative riveting part 22.

[0066] Optionally, as Figure 4 and Figure 5 shown, the thickness dimension of the insulating connector 23 in the second direction between the two side limiting slots 231 is a, and it satisfies 0.5 ≤ T1 / a ≤ 2. By limiting the thickness dimension a of the insulating connector 23 in the second direction between the two side limiting slots 231 to satisfy 0.5 ≤ T1 / a ≤ 2, on the one hand, it avoids the thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction being too small, resulting in weak structural strength and being unable to effectively resist the tendency of the positive riveting part 21 and the negative riveting part 22 to warp and deform during riveting. On the other hand, it avoids the thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction being too large, resulting in material redundancy and increasing unnecessary costs.

[0067] Optionally, as Figure 4 and Figure 5 shown, the thickness dimension of the wall surface of the limiting slot 231 facing the cover body 1 in the first direction is T2, and it satisfies 0.5 ≤ T2 / a ≤ 2. By limiting the thickness dimension T2 of the wall surface of the limiting slot 231 facing the cover body 1 in the first direction to satisfy 0.5 ≤ T2 / a ≤ 2, on the one hand, it avoids the thickness dimension T2 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction being too small, resulting in weak structural strength and causing the insulating connector 23 to easily come out between the positive riveting part 21 and the negative riveting part 22. On the other hand, it avoids the thickness dimension T2 of the wall surface of the limiting slot 231 facing away from the cover body 1 in the first direction being too large, resulting in material redundancy and increasing unnecessary costs.

[0068] Optionally, as Figure 4 and Figure 5As shown, the thickness dimension T1 of the wall surface of the limiting slot 231 facing away from the cover plate body 1 in the first direction is equal to the thickness dimension T2 of the wall surface of the limiting slot 231 facing the cover plate body 1 in the first direction, satisfying T1 = T2. By making T1 = T2, on the one hand, it is convenient for the injection molding of the insulating structural member, and on the other hand, it ensures that after the insulating connector 23 is injection molded, the stress on the two side wall surfaces of the limiting slot 231 in the first direction is uniform.

[0069] Optionally, as Figure 4 and Figure 5 shown, the thickness dimension a of the insulating connector 23 in the second direction between the two limiting slots 231 satisfies 0.7mm ≤ a ≤ 2mm. On the one hand, it avoids the thickness of the insulating connector 23 in the second direction between the two limiting slots 231 being too small, resulting in ineffective insulation for the positive riveting member 21 and the negative riveting member 22. On the other hand, it avoids the thickness of the insulating connector 23 in the second direction between the two limiting slots 231 being too large, resulting in material redundancy and increasing unnecessary costs. In this embodiment, the thickness dimension a of the insulating connector 23 in the second direction between the two limiting slots 231 can be any value between 0.7mm and 2mm or the range between any two values, such as 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0070] Optionally, as Figure 4 、 Figure 6 and Figure 7 shown, the cover plate body 1 is provided with a positive through hole 13 and a negative through hole 14 that are spaced apart in the second direction. The positive riveting member 21 is provided with a first through hole 212 communicating with the positive through hole 13, and the negative riveting member 22 is provided with a second through hole 222 communicating with the negative through hole 14. The width dimension of the cover plate body 1 in the third direction is A, the diameter dimensions of both the first through hole 212 and the second through hole 222 are B, and the width dimension of the positive riveting member 21 and the negative riveting member 22 in the second direction is W, and it satisfies 1.5mm ≤ (W - B) ≤ (A - B - 4)mm. On the one hand, it avoids that after the positive riveting member 21 is provided with the first through hole 212 and the negative riveting member 22 is provided with the second through hole 222, the remaining material thickness in the third direction is too small, resulting in a reduction in the structural strength of the positive riveting member 21 at the location of the first through hole 212 and the structural strength of the negative riveting member 22 at the location of the second through hole 222, thus leading to problems such as cracking after riveting. On the other hand, it avoids that after the positive riveting member 21 is provided with the first through hole 212 and the negative riveting member 22 is provided with the second through hole 222, the remaining material thickness in the third direction is too large, resulting in material redundancy and increasing unnecessary costs.

[0071] Optionally, as Figure 4 and Figure 6 shown, the thickness dimensions of the positive rivet 21 and the negative rivet 22 in the first direction are both H, and 2.5 mm ≤ H ≤ 4 mm is satisfied. On the one hand, it avoids the too small thickness of the positive rivet 21 and the negative rivet 22 in the first direction, resulting in poor structural strength and easy occurrence of cracking and other problems after riveting. On the other hand, it avoids the too large thickness of the positive rivet 21 and the negative rivet 22 in the first direction, resulting in material redundancy and increasing unnecessary costs. In this embodiment, the thickness dimension H is preferably 3 mm.

[0072] In this embodiment, a battery is further provided. The battery includes a pole group, a battery housing, and the above-mentioned battery cover plate. The battery housing is a hollow shell structure with an opening. The battery cover plate is covered on the opening of the battery housing and closes the battery housing to form a receiving cavity for accommodating the pole group. The pole group includes a positive ear and a negative ear. The positive ear is connected to the positive pole 31, and the negative ear is connected to the negative pole 32. It not only improves the reliability of the structure, thus enhancing the basic performance, but also reduces the occurrence of problems such as thermal runaway caused by poor welding, and thus has high use safety.

[0073] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Battery cover plate, characterized in that, The battery cover comprises: Cover plate body; A fixing assembly, the fixing assembly comprising a positive rivet, a negative rivet and an insulating connector, the positive rivet and the negative rivet are both arranged on the same side of the cover body along the first direction and are spaced apart along the second direction, a first boss is provided on the side of the positive rivet facing the negative rivet, a second boss is provided on the side of the negative rivet facing the positive rivet, the insulating connector is arranged between the positive rivet and the negative rivet, both sides of the insulating connector along the second direction are provided with limited slots, and the first boss and the second boss are both inserted into the corresponding limited slots; A pole assembly, the pole assembly comprising a positive pole and a negative pole, the positive pole comprising a first riveted portion and a first limiting portion, the first riveted portion passing through the cover plate body and eccentrically riveted to a side of the positive pole riveted member away from the insulating connector, the first limiting portion abutting against a side of the cover plate body away from the positive pole riveted member, the negative pole comprising a second riveted portion and a second limiting portion, the second riveted portion passing through the cover plate body and eccentrically riveted to a side of the negative pole riveted member away from the insulating connector, the second limiting portion abutting against a side of the cover plate body away from the negative pole riveted member; The distance dimension between the surface of the first boss facing the insulating connector and the central axis of the first riveting portion along the second direction, and the distance dimension between the surface of the second boss facing the insulating connector and the central axis of the second riveting portion along the second direction are both Y. The thickness dimension of the wall surface of the limiting slot facing away from the cover plate body along the first direction is T1, and it satisfies where δ b is the tensile strength of the material used for the insulating connector.

2. The battery cover plate according to claim 1, wherein, A distance dimension between a surface of the first boss facing the insulating connector and a central axis of the first rivet portion along the second direction and a distance dimension Y between a surface of the second boss facing the insulating connector and a central axis of the second rivet portion along the second direction satisfy 20mm≤Y≤50mm.

3. The battery cover plate according to claim 1, wherein The thickness dimension of the insulating connector between the limiting slots on both sides along the second direction is a, and satisfies 0.5≤T1 / a≤2.

4. The battery cover plate according to claim 3, wherein, A thickness dimension of a wall surface of the limiting slot facing the cover body along the first direction is T2, and satisfies 0.5≤T2 / a≤2.

5. The battery cover plate according to claim 4, characterized in that, A thickness dimension T1 of a wall surface of the limiting slot facing away from the cover body along the first direction and a thickness dimension T2 of a wall surface of the limiting slot facing the cover body along the first direction satisfy T1=T2.

6. The battery cover plate according to claim 4, characterized in that, The thickness dimension a of the insulating connector between the limiting slots on both sides along the second direction satisfies 0.7 mm ≤ a ≤ 2 mm.

7. The battery cover plate according to claim 1, wherein The cover plate body is provided with a positive through hole and a negative through hole spaced apart along the second direction, the positive rivet is provided with a first through hole communicating with the positive through hole, the negative rivet is provided with a second through hole communicating with the negative through hole, the width dimension of the cover plate body along the third direction is A, the diameter dimensions of the first through hole and the second through hole are both B, the width dimensions of the positive rivet and the negative rivet along the second direction are W, and satisfy 1.5mm≤(WB)≤(AB-4)mm.

8. The battery cover plate according to claim 1, wherein The thickness dimensions of the positive electrode rivet and the negative electrode rivet along the first direction are both H, and satisfy 2.5 mm≤H≤4 mm.

9. The battery cover plate according to claim 1, wherein, The insulating connector is made of PET, PPS, Al2O3 or ZrO2 material.

10. A battery, characterized in that, The battery includes a pole group, a battery housing, and a battery cover plate as described in any one of claims 1-9. The battery housing is a hollow housing structure provided with an opening. The battery cover plate is disposed at the opening of the battery housing and closes the battery housing to form a receiving cavity for accommodating the pole group. The pole group includes a positive electrode tab and a negative electrode tab. The positive electrode tab is connected to the positive electrode post, and the negative electrode tab is connected to the negative electrode post.

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