Battery cover plate and battery

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery cover plate and a battery, and the battery cover plate comprises a cover plate body, a connecting block and a pole. And the body part of the connecting block and the connecting part are compounded into a whole. The body part is provided with a first through mounting hole, and the connecting part is provided with a second through mounting hole. One end of the pole penetrates through the cover plate body, the first mounting hole and the second mounting hole and then is riveted with the connecting block to form a riveting part, and the riveting part and the connecting part are welded to form a welding part. The body part and the connecting part are made of different metal materials, the riveting part and the connecting part are made of the same metal material, the metal materials on the two sides of the welding part are the same in melting point and the same in shrinkage rate after cooling, the welding quality of the welding part is good, and connection between the riveting part and the connecting part is reliable and high in stability. The body part of the connecting block can be made of a light metal material, so that the weight reduction effect is good, and the cost is reduced. The invention also provides a battery which comprises the battery cover plate.

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] A battery generally includes a battery cover plate, a negative electrode post, and a connection block. The negative electrode post passes through the battery cover plate and the connection block and is riveted to the connection block, and then the negative electrode post is welded to the connection block, so as to ensure that the negative electrode post is firmly fixed on the battery cover plate.

[0003] However, in order to ensure that the negative electrode post has a high current-carrying capacity, the negative electrode post is often made of copper material. In order to reduce costs and weight, the connection block is often made of aluminum material. Since the materials of the negative electrode post and the connection block are different and the melting points are inconsistent, welding quality problems such as weld cracking and pinholes are likely to occur after welding, the connection strength and sealing performance between the negative electrode post and the connection block cannot be guaranteed, and the reliability of the battery is reduced. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery cover plate and a battery, in which the welding quality between the negative electrode post and the connection block is good, the connection strength is high, the reliability of the battery is high, and at the same time the cost and weight are low.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] On the one hand, the present invention provides a battery cover plate, which includes:

[0007] A cover plate body;

[0008] A connection block, including a body portion and a connection portion. The body portion and the connection portion are of an integral structure, and the body portion and the connection portion are made of different metal materials. The body portion is provided with a through first installation hole, the connection portion is embedded in at least part of the inner wall of the first installation hole, and a first joint is formed between the connection portion and at least part of the inner wall of the first installation hole. The connection portion is provided with a through second installation hole, and the centers of the first installation hole and the second installation hole are coaxial;

[0009] A pole column, one end of the pole column passes through the cover plate body, the first installation hole, and the second installation hole and is riveted to the body portion or the connection portion. The end of the pole column riveted to the body portion or the connection portion expands in the radial direction of the first installation hole to form a riveted portion. The riveted portion and the connection portion are made of the same metal material, and a welded portion is formed by welding at the second joint between the riveted portion and the connection portion;

[0010] Wherein, the distance between the second seam and the first seam along the first direction is greater than half of the fusion width of the welded part; the distance between the second seam and the first seam along the second direction is greater than half of the fusion width of the welded part; the dimension of the connecting part along the third direction is greater than the penetration depth of the welded part, and the first direction, the second direction and the third direction are perpendicular to each other in pairs.

[0011] Optionally, there is one pole column, one connecting part, one first mounting hole on the body part and one second mounting hole on the connecting part, and the pole column, the first mounting hole and the second mounting hole correspond to each other one by one;

[0012] Along the first direction, the distance between the second seam and the first side wall of the body part is a1, the distance between the second seam and the second side wall of the body part is b1, the distance between the second seam and the first seam is A1, and the fusion width of the welded part is J1;

[0013] Among them, a1, A1 and J1 satisfy: J1 / 2 < A1 ≤ a1 / 2;

[0014] b1, A1 and J1 satisfy: J1 / 2 < A1 ≤ b1 / 2;

[0015] The value range of a1 is: 4mm ≤ a1 ≤ 40mm;

[0016] The value range of b1 is: 4mm ≤ b1 ≤ 40mm;

[0017] The value range of J1 is: 0.3mm ≤ J1 ≤ 1.0mm.

[0018] Optionally, along the second direction, the distance between the second seam and the third side wall of the body part is c1, the distance between the second seam and the fourth side wall of the body part is d1, the distance between the second seam and the first seam is B1, the fusion width of the welded part is J2, and J1 = J2;

[0019] Among them, c1, B1 and J2 satisfy: J2 / 2 < B1 ≤ c1;

[0020] d1, B1 and J2 satisfy: J2 / 2 < B1 ≤ d1;

[0021] The value range of c1 is: 2mm ≤ c1 ≤ 40mm;

[0022] The value range of d1 is: 2mm ≤ d1 ≤ 40mm.

[0023] Optionally, a first sink is provided on the inner wall of the first mounting hole, the connecting portion is embedded in the first sink, a second sink is provided on the end surface of the connecting portion away from the main body, the cross section of the second sink is circular, the second sink is coaxial with the second mounting hole, the diameter of the second sink is larger than the diameter of the second mounting hole; the second sink includes a horizontal step surface;

[0024] Along the first direction, the width of the horizontal step surface is W1, and J1, W1 and A1 satisfy:

[0025] J1 / 2<W1≤A1 / 2.

[0026] Optionally, along the third direction, the size of the connecting portion is G1, the depth of the first sink is H1, the depth of the second sink is H2, the size of the main body is H, and the penetration of the welding portion is K1;

[0027] Among them, H1, H2 and H satisfy: H2

[0028] G1 and H1 satisfy: G1=H1;

[0029] K1, G1 and H satisfy: K1<G1≤H;

[0030] The value range of H2 is: 0.1mm≤H2<0.3mm;

[0031] The value range of K1 is: 0.3mm≤K1≤0.6mm;

[0032] The value range of H is: 1.0mm≤H≤5.0mm.

[0033] Optionally, there are two poles, two connecting parts, each connecting part is provided with a second mounting hole, and there are two first mounting holes on the main body, and the poles, the first mounting holes and the second mounting holes correspond to each other one by one; a first seam I is formed between one of the connecting parts and the inner wall of the first mounting hole corresponding to it, and a second seam I is formed between the rivet part of the pole corresponding to it; a first seam II is formed between the other connecting part and the inner wall of the first mounting hole corresponding to it, and a second seam II is formed between the rivet part of the pole corresponding to it; the first seam I and the second seam I are close to the first side wall of the main body, and the first seam II and the second seam II are close to the second side wall of the main body;

[0034] ​Along the first direction, the distance between the second seam Ⅰ and the first side wall is a2, the distance between the second seam Ⅱ and the second side wall is b2, and the distance between the sides of the second seam Ⅰ and the second seam Ⅱ that are close to each other is e; the distances between the second seam Ⅰ close to the first side wall and the first seam Ⅰ, and between the second seam Ⅱ close to the second side wall and the first seam Ⅱ are both A2; the distances between the second seam Ⅰ and the first seam Ⅰ on the sides of the two connecting parts that are close to each other, and between the second seam Ⅱ and the first seam Ⅱ on the sides of the two connecting parts that are close to each other are both A3, and the fusion width of the welding part is J3;

[0035] Among them, a2, A2, and J3 satisfy: J3 / 2 < A2 ≤ a2 / 2;

[0036] b2, A2, and J3 satisfy: J3 / 2 < A2 ≤ b2 / 2;

[0037] e, A3, and J3 satisfy: J3 / 2 < A3 ≤ e / 4;

[0038] The value range of a2 is: 2mm ≤ a2 ≤ 30mm;

[0039] The value range of b2 is: 2mm ≤ b2 ≤ 30mm;

[0040] The value range of e is: 5mm ≤ e ≤ 80mm;

[0041] The value range of J3 is: 0.3mm ≤ J3 ≤ 1.0mm.

[0042] Optionally, along the second direction, the distances between the second seam Ⅰ and the second seam Ⅱ and the third side wall of the body part are both c2, and the distances between the second seam Ⅰ and the second seam Ⅱ and the fourth side wall of the body part are both d2; the distances between the second seam Ⅰ and the first seam Ⅰ, and between the second seam Ⅱ and the first seam Ⅱ are both B2, the fusion width of the welding part is J4, and J4 = J3; among them, c2, B2, and J4 satisfy: J4 / 2 < B2 ≤ c2;

[0043] d2, B2, and J4 satisfy: J4 / 2 < B2 ≤ d2;

[0044] The value range of c2 is: 2mm ≤ c2 ≤ 30mm;

[0045] The value range of d2 is: 2mm ≤ d2 ≤ 30mm.

[0046] Optionally, a first sink is provided on the inner wall of each of the first mounting holes on the main body, the two connecting parts are respectively embedded in one of the first sinks, a second sink is provided on the end surface of the connecting part away from the main body, the cross section of the second sink is circular, the second sink is coaxial with the second mounting hole, the diameter of the second sink is larger than the diameter of the second mounting hole; the second sink includes a horizontal step surface;

[0047] Along the first direction, the width of the horizontal step surface is W2, and J3, W2 and A2 satisfy:

[0048] J3 / 2<W2≤A2 / 2.

[0049] Optionally, along the third direction, the size of the connecting portion is G2, the depth of the first sink is H01, the depth of the second sink is H02, the size of the main body is H0, and the penetration depth of the welding portion is K2;

[0050] Among them, H01, H02 and 0H satisfy: H02<H01≤H0;

[0051] G2 and H01 satisfy: G2=H01;

[0052] K2, G2 and H0 satisfy: K2<G2≤H0;

[0053] The value range of H02 is: 0.1mm≤H02<0.3mm;

[0054] The value range of K2 is: 0.3mm≤K2≤0.6mm;

[0055] The value range of H0 is: 1.0mm≤H0≤5.0mm.

[0056] On the other hand, the present invention provides a battery, comprising the battery cover plate in any of the above schemes.

[0057] The beneficial effects of the present invention are:

[0058] The present invention provides a battery cover plate, which includes a cover plate body, a connecting block and a pole column. A connecting portion is embedded in the body portion of the connecting block, and the body portion and the connecting portion are compounded into one body. The body portion is provided with a through first mounting hole, and the connecting portion is provided with a through second mounting hole. One end of the pole column passes through the cover plate body, the first mounting hole, the second mounting hole and is riveted to the connecting block to form a riveting portion, and the riveting portion is welded to the connecting portion to form a welding portion. The body portion and the connecting portion are made of different metal materials, the riveting portion and the connecting portion are made of the same metal material, the melting points of the metal materials on both sides of the welding portion are the same, and the shrinkage rates after cooling are the same. The welding quality of the welding portion is good, and problems such as explosion points and false soldering are not likely to occur. The connection between the riveting portion and the connecting portion is reliable and has high stability. At the same time, the body portion of the connecting block can be made of a lighter metal material, with good weight reduction effect and reduced cost.

[0059] The present invention also provides a battery, which includes a housing, a pole group and the above-mentioned battery cover plate. By adopting the above-mentioned battery cover plate, the reliability of the battery can be guaranteed to be relatively high and the sealing performance is good. Description of the Drawings

[0060] Figure 1 It is a top view of the battery cover plate provided in Embodiment 1 of the present invention;

[0061] Figure 2 is Figure 1 a sectional view taken along line A-A in

[0062] Figure 3 is Figure 2 a partial enlarged view at C in

[0063] Figure 4 is Figure 2 a partial enlarged view at C in

[0064] Figure 5 is Figure 1 a sectional view taken along line B-B in

[0065] Figure 6 is Figure 5 a partial enlarged view at D in

[0066] Figure 7 is Figure 5 a partial enlarged view at D in

[0067] Figure 8 It is a section of the battery cover plate provided in Embodiment 2 of the present invention Figure 1 ;

[0068] Figure 9 is Figure 8 a partial enlarged view at E in

[0069] Figure 10 is Figure 8 Partial enlarged view at E in (after welding);

[0070] Figure 11 is Figure 8 Partial enlarged view at F in (before welding);

[0071] Figure 12 is Figure 8 Partial enlarged view at F in (after welding);

[0072] Figure 13 is the cross-section of the battery cover plate provided in the second embodiment of the present invention Figure 2 ;

[0073] Figure 14 is Figure 13 Partial enlarged view at G in (before welding);

[0074] Figure 15 is Figure 13 Partial enlarged view at G in (after welding).

[0075] In the figure:

[0076] 100, connecting block; 110, body part; 111, first sunk platform; 112, third sunk platform; 1101, first side wall; 1102, second side wall; 1103, third side wall; 1104, fourth side wall; 120, connecting part; 121, second sunk platform; 130, welding part; 200, pole; 210, plate body part; 220, first column; 230, second column; 231, riveting part; 300, cover plate body; 400, first plastic part; 500, second plastic part; 510, accommodating groove; 600, seal. Detailed implementation manners

[0077] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0078] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, 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. Therefore, it should not be construed as a limitation on the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the first feature has a lower horizontal height than the second feature.

[0079] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside 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 circumstances.

[0080] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation on the present invention.

[0081] Embodiment 1

[0082] As Figure 1 、 Figure 2 and Figure 5 shown, this embodiment provides a battery cover plate, which includes a cover plate body 300, a connecting block 100 and a terminal 200. The connecting block 100 includes a body portion 110 and a connecting portion 120, and the body portion 110 and the connecting portion 120 are made of different metal materials. In this embodiment, the connecting portion 120 can be set as a cuboid. In other embodiments, the connecting portion 120 can also be set as a cylinder.

[0083] Optionally, the body portion 110 is provided with a through first mounting hole. At least part of the inner wall of the first mounting hole forms a first sunk platform 111. The connecting portion 120 is embedded in the first sunk platform 111, and a first joint seam is formed between the connecting portion 120 and the side wall of the platform of the first sunk platform 111. The connecting portion 120 is provided with a through second mounting hole. Both the first mounting hole and the second mounting hole are circular holes. The centers of the first sunk platform 111, the first mounting hole, and the second mounting hole are coaxial and communicate with each other. One end of the pole 200 passes through the cover body 300, the first mounting hole, and the second mounting hole and is riveted to a third sunk platform 112 on the body portion 110 or the connecting portion 120. The third sunk platform 112 is a circular sunk platform. One end of the pole 200 riveted to the body portion 110 expands in the radial direction of the first mounting hole to form a riveting portion 231. The circumferential side wall of the riveting portion 231 abuts against the second joint seam. The riveting portion 231 and the connecting portion 120 are made of the same metal material. A welding portion 130 is formed by welding at the second joint seam of the riveting portion 231 and the connecting portion 120.

[0084] Exemplarily, the pole 200 can be a negative pole 200. Both the riveting portion 231 and the connecting portion 120 can be made of copper material, and the body portion 110 can be made of aluminum material. Since the riveting portion 231 and the connecting portion 120 are made of the same metal material, when the riveting portion 231 and the connecting portion 120 are welded, the melting points of the riveting portion 231 and the connecting portion 120 are the same, and the shrinkage rates after welding and cooling are the same. The welding quality of the welding portion 130 is good, and problems such as explosion points and false soldering are not likely to occur. The connection between the riveting portion 231 and the connecting portion 120 is reliable and has high stability. At the same time, the body portion 110 of the connecting block 100 can be made of aluminum material, which is beneficial to reducing the overall weight of the connecting block 100 and reducing the cost.

[0085] Further, the distance between the second joint seam and the first joint seam along the first direction is greater than half of the fusion width of the welding portion 130; the distance between the second joint seam and the first joint seam along the second direction is greater than half of the fusion width of the welding portion 130; the dimension of the connecting portion 120 along the third direction is greater than the fusion depth of the welding portion 130. That is, the dimension of the connecting portion 120 along the first direction is greater than half of the fusion width of the welding portion 130; the dimension of the connecting portion 120 along the second direction is greater than half of the fusion width of the welding portion 130; the fusion depth of the welding portion 130 is less than the dimension of the connecting portion 120 along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other pairwise. Among them, the first direction refers to Figure 1 the X-axis direction shown in Figure 1 and the second direction refers to Figure 2The Z-axis direction shown in the figure. Through the above settings, it is ensured that a sufficiently large molten pool is formed when the riveting portion 231 is welded to the connecting portion 120, and the molten pool does not spread to the body portion 110 of the connecting block 100, thereby ensuring that the welding quality of the welded portion 130 after the riveting portion 231 is welded to the connecting portion 120 is relatively high, and the yield rate of welding is high.

[0086] It should be noted that if the dimension of the connecting portion 120 in the third direction is greater than the depth of the third sink 112, the third sink 112 is provided on the connecting portion 120. If the dimension of the connecting portion 120 in the third direction is less than the depth of the third sink 112, the third sink 112 is provided on the body portion 110. If the dimension of the connecting portion 120 in the third direction is equal to the depth of the third sink 112, at this time, the diameter of the second mounting hole is set to be smaller than the diameter of the first mounting hole on the body portion 110, and a third sink 112 is formed between a part of the inner wall of the first sink 111 close to the first mounting hole and the inner wall of the second mounting hole.

[0087] Certainly, in some other embodiments, the dimension of the connecting portion 120 in the third direction may also be equal to the dimension of the body portion 110 in the third direction. At this time, there is no need to provide the first sink 111 on the body portion 110, and the connecting portion 120 is directly compounded with the inner wall of the first mounting hole of the body portion 110. At this time, the third sink 112 may be provided on the inner wall of the second mounting hole of the connecting portion 120, and the terminal post 200 is riveted to the connecting portion 120.

[0088] See Figure 2 、 Figure 3 and Figure 4, the battery cover plate in this embodiment further includes a first plastic part 400, a second plastic part 500 and a seal 600. The first plastic part 400 and the second plastic part 500 are respectively arranged on both sides of the cover plate body 300, and the second plastic part 500 is clamped between the connecting block 100 and the cover plate body 300. A receiving groove 510 is provided on the side of the second plastic part 500 facing away from the cover plate body 300, and the connecting block 100 is arranged in the receiving groove 510, thereby ensuring accurate positioning between the connecting block 100 and the second plastic part 500. The pole column 200 includes a plate body part 210, a first column body 220 and a second column body 230. The second column body 230 sequentially passes through the first plastic part 400, the cover plate body 300, the second plastic part 500 and the connecting block 100 and then is connected to the connecting part 120 of the connecting block 100. The end of the second column body 230 is riveted to the connecting block 100 to form a riveting part 231. The plate body part 210 presses the first plastic part 400 against one end face of the cover plate body 300, and the riveting part 231 presses the connecting block 100 and the second plastic part 500 against the other end face of the cover plate body 300. The cover plate body 300 and the pole column 200 are insulated through the first plastic part 400 and the second plastic part 500. The seal 600 is clamped between the first column body 220 and the cover plate body 300, and between the first column body 220 and the second plastic part 500. The gap between the pole column 200 and the cover plate body 300 is sealed through the seal 600.

[0089] The battery cover plate in this embodiment has a single-pole-column 200 structure. There is one pole column 200, one connecting part 120, one first mounting hole on the body part 110 and one second mounting hole on the connecting part 120. The pole column 200, the first mounting hole and the second mounting hole correspond one by one. Along the first direction, the distance between the second joint seam and the first side wall 1101 of the body part 110 is a1, the distance between the second joint seam and the second side wall 1102 of the body part 110 is b1, the distance between the second joint seam of the connecting part 120 and its outer wall close to the first side wall 1101 is A1, the distance between the second joint seam of the connecting part 120 and its outer wall close to the second side wall 1102 is also A1, and the weld width of the welding part 130 is J1.

[0090] Among them, the following relationships are satisfied among a1, A1, and J1: J1 / 2 < A1 ≤ a1 / 2, and the following relationships are satisfied among b1, A1, and J1: J1 / 2 < A1 ≤ b1 / 2. By controlling the value of A1 within the above range, on the one hand, it is ensured that there is enough copper material at the connecting portion 120 in the connecting block 100 to meet the welding requirements, and the generated molten pool will not spread along the first direction to the body portion 110 of the connecting block 100, thereby ensuring that the connecting block 100 has a relatively high structural strength and the contact interface between the body portion 110 and the connecting portion 120 is intact. On the other hand, the amount of copper material is reduced, the cost is lowered, and at the same time, it is ensured that the exposed area of the body portion 110 is relatively large, which provides convenience for connecting the body portion 110 with the bus bar. The bus bar is made of aluminum material, and the bus bar is welded to the body portion 110 to realize the series and parallel connection of the batteries.

[0091] Optionally, in this embodiment, the value range of a1 is: 4 mm ≤ a1 ≤ 40 mm. For example, the value of a1 can be 4 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, etc. The value range of b1 is: 4 mm ≤ b1 ≤ 40 mm. For example, the value of b1 can be 4 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, etc.

[0092] For the convenience of processing and manufacturing, in this embodiment, a1 = b1 is taken as an example for illustration, that is, the axes of the first mounting hole and the second mounting hole on the connecting block 100 coincide with the center of the connecting block 100 along the first direction. Of course, in other embodiments, the value of a1 and the value of b1 may not be equal, that is, the first mounting hole and the second mounting hole on the connecting block 100 are eccentrically arranged.

[0093] Furthermore, the value range of J1 is: 0.3 mm ≤ J1 ≤ 1.0 mm. For example, the value of J1 can be 0.3 mm, 0.5 mm, 0.8 mm, 1.0 mm, etc. By restricting the value of J1 within the above range, the width of the welding portion 130 formed by welding the riveting portion 231 and the connecting portion 120 is relatively large, and the connection strength at the welding portion 130 is relatively high, avoiding loosening between the pole column 200 and the connecting block 100, and having good reliability and stability.

[0094] See Figure 5 、 Figure 6 and Figure 7, along the second direction, the distance between the second seam and the third side wall 1103 of the main body portion 110 is c1, the distance between the second seam and the fourth side wall 1104 of the main body portion 110 is d1, the distance between the second seam of the connecting portion 120 and its outer wall close to the third side wall 1103 is B1, and the distance between the second seam of the connecting portion 120 and its outer wall close to the fourth side wall 1104 is also B1. The fusion width of the welding portion 130 is J2. Since the riveting portion 231 of the terminal post 200 is cylindrical and the second mounting hole of the connecting portion 120 is also a circular hole, the welding portion 130 formed between the riveting portion 231 and the connecting portion 120 is annular. In this annular welding portion 130, the width in the radial direction of the second mounting hole is equal everywhere, that is, J1 = J2. The value range of J2 is: 0.3 mm ≤ J2 ≤ 1.0 mm.

[0095] Furthermore, between c1, B1 and J2, it satisfies: J2 / 2 < B1 ≤ c1, and between d1, B1 and J2, it satisfies: J2 / 2 < B1 ≤ d1. By controlling the value of B1 within the above range, there is enough copper material at the connecting portion 120 in the connecting block 100 to meet the welding requirements, and the generated molten pool will not spread along the second direction to the main body portion 110 of the connecting block 100, thereby ensuring that the connecting block 100 has a relatively high structural strength and the contact interface between the main body portion 110 and the connecting portion 120 is intact. In some embodiments, B1 = c1 = d1 can be set. At this time, the axes of the first mounting hole and the second mounting hole on the connecting block 100 coincide with the center of the connecting block 100 along the second direction, and both ends of the connecting portion 120 along the second direction extend to both ends of the main body portion 110 along the second direction, that is, one outer wall of the connecting portion 120 along the second direction is flush with the third side wall 1103 of the main body portion 110 along the second direction, and the other outer wall of the connecting portion 120 along the second direction is flush with the fourth side wall 1104 of the main body portion 110 along the second direction. When the connecting portion 120 and the main body portion 110 are combined, the operation is convenient, and the connecting block 100 is easy to process and manufacture.

[0096] Optionally, in this embodiment, the value range of c1 is: 2 mm ≤ c1 ≤ 40 mm. For example, the value of c1 can be 2 mm, 4 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm or 40 mm, etc. The value range of d1 is: 2 mm ≤ d1 ≤ 40 mm. For example, the value of d1 can be 2 mm, 4 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm or 40 mm, etc.

[0097] Continue to refer to Figure 3 and Figure 4, on the end face of the connecting portion 120 on the side away from the main body portion 110, there is a second sinking platform 121. The second sinking platform 121 is a circular sinking platform, the cross-section of the second sinking platform 121 is circular, the second sinking platform 121 is coaxial with the second mounting hole, and the diameter of the second sinking platform 121 is greater than the diameter of the second mounting hole. By providing the second sinking platform 121, the welding portion 130 will not exceed the end face of the connecting block 100 on the side away from the cover plate body 300, which is convenient for the subsequent connection of the connecting block 100 with the bus bar (note: the bus bar is made of aluminum material, and the bus bar is welded to the main body portion 110 of the connecting block 100). The second sinking platform 121 includes a horizontal step surface. Along the first direction, the width of the horizontal step surface is W1, and the relationship among J1, W1, and A1 satisfies: J1 / 2 < W1 ≤ A1 / 2. The value of W1 can be 0.15 mm, 0.3 mm, 1.0 mm, 3.0 mm, etc. This ensures that the welding portion 130 is completely embedded in the second sinking platform 121 and will not interfere with the bus bar, affecting the welding of the main body portion 110 and the bus bar.

[0098] Along the third direction, the dimension of the connecting portion 120 is G1, the depth of the first sinking platform 111 is H1, the depth of the second sinking platform 121 is H2, and the dimension of the main body portion 110 is H. Among them, the relationship between G1 and H1 satisfies: G1 = H1, so that the connecting portion 120 is exactly embedded in the first sinking platform 111 of the main body portion 110, ensuring that the end face of the connecting portion 120 on the side away from the cover plate body 300 is flush with the end face of the main body portion 110 on the side away from the cover plate body 300, and the appearance of the connecting block 100 is regular and not easy to scratch other structural parts. The relationship among H1, H2, and H satisfies: H2 < H1 ≤ H, ensuring the reasonable distribution of the connecting portion 120 and the main body portion 110 in the connecting block 100.

[0099] Optionally, in this embodiment, the value range of H2 is: 0.1 mm ≤ H2 < 0.3 mm. For example, the value of H2 can be 0.1 mm, 0.2 mm, or 0.3 mm, etc. The value range of H is: 1.0 mm ≤ H ≤ 5.0 mm. For example, the value of H can be 1.0 mm, 2.0 mm, 3.0 mm, 4.0 mm, or 5.0 mm, etc.

[0100] Furthermore, the penetration depth of the welding portion 130 is K1. The relationship among K1, G1, and H satisfies: K1 < G1 ≤ H, so as to ensure that the welding portion 130 is located within the connecting portion 120 and will not penetrate into the main body portion 110 along the third direction, thereby ensuring good welding quality and high connection strength of the welding portion 130. The value range of K1 is: 0.3 mm ≤ K1 ≤ 0.6 mm. For example, the value of K1 can be 0.3 mm, 0.4 mm, 0.5 mm, or 0.6 mm, etc.

[0101] This embodiment also provides a battery, including a housing, a pole group, and the above-mentioned battery cover plate. By adopting the above-mentioned battery cover plate, the reliability of the battery can be ensured to be relatively high and the sealing performance is good.

[0102] Optionally, the battery may be a blade battery. Openings are provided at both opposite ends of the housing. There are two battery covers, which are respectively fastened to one opening, and the pole posts 200 are accommodated in the housing. The pole post 200 on one of the battery covers is the positive pole post 200, and the pole post 200 on the other battery cover is the negative pole post 200. The positive ear of the electrode group is connected to the positive pole post 200, and the negative ear of the electrode group is connected to the negative pole post 200.

[0103] Next, the value ranges of the above parameters A1, B1, a1, b1, c1, d1, J1, J2, K1, G1, and H are verified for the batteries in some specific samples. The details are shown in Table 1.

[0104] Table 1

[0105]

[0106] It can be seen from the above results that the value of A1 in Sample 1 does not meet the dimensional limit of J1 / 2 < A1 ≤ a1 / 2, and the value of B1 does not meet the dimensional limit of J2 / 2 < B1 ≤ c1. The volume of the connecting portion 120 is small. After the connecting portion 120 is welded to the riveting portion 231, a part of the main body portion 110 of the connecting block 100 melts, the intersection interface of the connecting portion 120 and the main body portion 110 in the first direction is damaged, and the intersection interface of the connecting portion 120 and the main body portion 110 in the second direction is also damaged. The mechanical properties of the connecting block 100 decline, the reliability decreases, and the battery is defective.

[0107] For Samples 2, 3, 4, 5, 6, 8, 9, and 10, all the above parameters meet the requirements. After the connecting portion 120 is welded to the riveting portion 231, the main body portion 110 in the connecting block 100 does not melt, the intersection interface between the connecting portion 120 and the main body portion 110 is normal, the mechanical properties of the connecting block 100 are high, the reliability is high, and the welding portion 130 between the connecting portion 120 and the riveting portion 231 has good quality, without welding quality problems such as explosion points and false soldering, and the sealing performance meets the requirements, and the battery is good.

[0108] In Sample 7, the value of G1 does not meet the dimensional limit of K1 < G1 ≤ H. The volume of the connecting portion 120 is small. After the connecting portion 120 is welded to the riveting portion 231, a part of the main body portion 110 in the connecting block 100 melts, the intersection interface of the connecting portion 120 and the main body portion 110 in the third direction is damaged, the mechanical properties of the connecting block 100 decline, the reliability decreases, and the battery is defective.

[0109] Next, the value ranges of the above parameters a1, b1, c1, and d1 are verified for the batteries in some specific samples. The details are shown in Table 2.

[0110] Table 2

[0111]

[0112] As can be seen from the above results, the value of a1 in Sample 1 is less than the lower limit of 4 mm ≤ a1 ≤ 40 mm. After the side of the connecting block 100 along the first direction (i.e., the side of the connecting block 100 with a size of a1) is riveted to the pole 200, it cracks, the product cannot be used, and the battery is defective.

[0113] The value of b1 in Sample 2 is less than the lower limit of 4 mm ≤ b1 ≤ 40 mm. After the other side of the connecting block 100 along the first direction (i.e., the side of the connecting block 100 with a size of b1) is riveted to the pole 200, it cracks, the product cannot be used, and the battery is defective.

[0114] The value of c1 in Sample 3 is less than the lower limit of 2 mm ≤ c1 ≤ 40 mm. After the side of the connecting block 100 along the second direction (i.e., the side of the connecting block 100 with a size of c1) is riveted to the pole 200, it cracks, the product cannot be used, and the battery is defective.

[0115] The value of d1 in Sample 4 is less than the lower limit of 2 mm ≤ d1 ≤ 40 mm. After the other side of the connecting block 100 along the second direction (i.e., the side of the connecting block 100 with a size of d1) is riveted to the pole 200, it cracks, the product cannot be used, and the battery is defective.

[0116] In Samples 5 to 12, the values of a1, b1, c1, and d1 are all within their size limits. After the connecting block 100 is riveted to the pole 200, there will be no cracking problem. After riveting, the flatness of the connecting block 100 is good, and the riveting is qualified. Further, after the connecting part 120 of the connecting block 100 is welded to the riveting part 231 of the pole 200, the welding quality between the two is good, the battery passes the helium leak detection, the sealing performance is good, and there is enough space on the connecting block 100 for connection with the bus bar, and the battery is good.

[0117] In Sample 13, the value of a1 is greater than the upper limit of 4 mm ≤ a1 ≤ 40 mm. After the connecting block 100 is riveted to the pole 200, one side of the connecting block 100 along the first direction (i.e., the side of the connecting block 100 with a size of a1) warps, the flatness of the connecting block 100 is poor, which affects the subsequent welding of the connecting part 120 of the connecting block 100 to the riveting part 231 of the pole 200, and the welding of the body part 110 of the connecting block 100 to the bus bar. The assembly is unqualified, and the helium leak detection fails, the sealing performance is poor, and the battery is defective.

[0118] In sample 14, the value of b1 is greater than the upper limit of 4 mm ≤ b1 ≤ 40 mm. After the connecting block 100 is riveted to the pole column 200, the other side of the connecting block 100 along the first direction (i.e., the side of the connecting block 100 with the dimension of b1) warps up. The flatness of the connecting block 100 is poor, which affects the subsequent welding of the connecting portion 120 of the connecting block 100 to the riveting portion 231 of the pole column 200 and the welding of the body portion 110 of the connecting block 100 to the bus bar. The assembly is unqualified, and the helium leak detection fails, with poor sealing performance and the battery being defective.

[0119] In sample 15, the value of c1 is greater than the upper limit of 2 mm ≤ c1 ≤ 40 mm. After the connecting block 100 is riveted to the pole column 200, one side of the connecting block 100 along the second direction (i.e., the side of the connecting block 100 with the dimension of c1) warps up. The flatness of the connecting block 100 is poor, which affects the subsequent welding of the connecting portion 120 of the connecting block 100 to the riveting portion 231 of the pole column 200 and the welding of the body portion 110 of the connecting block 100 to the bus bar. The assembly is unqualified, and the helium leak detection fails, with poor sealing performance and the battery being defective.

[0120] In sample 16, the value of d1 is greater than the upper limit of 2 mm ≤ d1 ≤ 40 mm. After the connecting block 100 is riveted to the pole column 200, the other side of the connecting block 100 along the second direction (i.e., the side of the connecting block 100 with the dimension of d1) warps up. The flatness of the connecting block 100 is poor, which affects the subsequent welding of the connecting portion 120 of the connecting block 100 to the riveting portion 231 of the pole column 200 and the welding of the body portion 110 of the connecting block 100 to the bus bar. The assembly is unqualified, and the helium leak detection fails, with poor sealing performance and the battery being defective.

[0121] Example Two

[0122] This example provides a battery cover plate. Refer to Figure 8 and Figure 13 , the difference between the battery cover plate in this example and that in Example One is that: the battery cover plate in this example has a double-pole-column 200 structure, with two pole columns 200 on the battery cover plate, two connecting portions 120 on the connecting block 100, one second mounting hole on each connecting portion 120, and two first mounting holes on the body portion 110, and the pole column 200, the first mounting hole, and the second mounting hole correspond one by one. A first joint Ⅰ is formed between one connecting portion 120 and the inner wall of its corresponding first mounting hole, and a second joint Ⅰ is formed between it and the riveting portion 231 of its corresponding pole column 200; a first joint Ⅱ is formed between the other connecting portion 120 and the inner wall of its corresponding first mounting hole, and a second joint Ⅱ is formed between it and the riveting portion 231 of its corresponding pole column 200; the first joint Ⅰ and the second joint Ⅰ are close to the first side wall 1101 of the body portion 110, and the first joint Ⅱ and the second joint Ⅱ are close to the second side wall 1102 of the body portion 110.

[0123] Refer toFigures 8 - 10 Along the first direction, the distance between the second seam I and the first side wall 1101 is a2, the distance between the second seam II and the second side wall 1102 is b2, the distance between the second seam I close to the first side wall 1101 and the first seam I, and the distance between the second seam II close to the second side wall 1102 and the first seam II are both A2; the weld width of the welding part 130 is J3.

[0124] Among them, J3, A2 and a2 satisfy: J3 / 2 < A2 ≤ a2 / 2; J3, A2 and b2 satisfy: J3 / 2 < A2 ≤ b2 / 2. By controlling the value of A2 within the above range, it is ensured that there is enough copper material at the connecting part 120 in the connecting block 100 to meet the welding requirements, and the molten pool generated will not spread along the first direction to the main body part 110 of the connecting block 100, thereby ensuring that the connecting block 100 has a relatively high structural strength and the contact interface between the main body part 110 and the connecting part 120 is intact.

[0125] Optionally, the value range of a2 is: 2mm ≤ a2 ≤ 30mm. For example, the value of a2 can be 2mm, 4mm, 5mm, 10mm, 20mm or 30mm, etc. The value range of b2 is: 2mm ≤ b2 ≤ 30mm. For example, the value of b2 can be 2mm, 4mm, 5mm, 10mm, 20mm or 30mm, etc. For the convenience of processing and manufacturing, in this embodiment, a2 = b2 is taken as an example for illustration, that is, the distance between the axis of the second mounting hole on one connecting part 120 and the first side wall 1101 is equal to the distance between the axis of the second mounting hole on the other connecting block 100 and the second side wall 1102.

[0126] The value range of J3 is: 0.3mm ≤ J3 ≤ 1.0mm. For example, the value of J3 can be 0.3mm, 0.5mm, 0.8mm or 1.0mm, etc. By restricting the value of J3 within the above range, the width of the welding part 130 formed by welding the riveting part 231 and the connecting part 120 is relatively large, and the connection strength at the welding part 130 is relatively high, avoiding loosening between the pole column 200 and the connecting block 100 during the use of the battery, and the reliability and stability of the battery are good.

[0127] Further, referring to Figure 8 、 Figure 11 and Figure 12, the distance between the sides of the second seams I and II that are close to each other is e. The distances between the second seam I and the first seam I on the sides of the two connecting parts 120 that are close to each other, and between the second seam II and the first seam II on the sides of the two connecting parts 120 that are close to each other are both A3. e, A3, and J3 satisfy: J3 / 2 < A3 ≤ e / 4. By limiting the value of A3 within the above range, the amount of copper material used can be reduced, the cost can be lowered, and at the same time, a relatively large exposed area of the body part 110 can be ensured, which provides convenience for connecting the body part 110 to the bus bar. The bus bar is made of aluminum material and is welded to the body part 110 to achieve the series and parallel connection of the batteries.

[0128] Optionally, the value range of e is: 5mm ≤ e ≤ 80mm. For example, the value of e can be 5mm, 10mm, 20mm, 30mm, 50mm, 60mm, or 80mm, etc.

[0129] See Figures 13 - 15 , along the second direction, the distances between the second seams (the second seam I and the second seam II) of each connecting part 120 and the third side wall 1103 of the body part 110 are both c2, and the distances between the second seams (the second seam I and the second seam II) of each connecting part 120 and the fourth side wall 1104 of the body part 110 are both d2. The distances between the second seam I and the first seam I, and between the second seam II and the first seam II are both B2, that is, the distances between the second seams on each connecting block 100 and their adjacent outer walls along the second direction are both B2. Since the riveting part 231 of the pole 200 is cylindrical and the second mounting holes of the connecting part 120 are also circular holes, the welding part 130 formed between the riveting part 231 and the connecting part 120 is annular. In this annular welding part 130, the width in the radial direction of the second mounting hole is equal everywhere, that is, J4 = J3. The value range of J4 is: 0.3mm ≤ J4 ≤ 1.0mm.

[0130] Among them, the following relationships are satisfied among c2, B2, and J4: J4 / 2 < B2 ≤ c2, and the following relationships are satisfied among d2, B2, and J4: J4 / 2 < B2 ≤ d2. By controlling the value of B2 within the above range, there is enough copper material at the connecting portion 120 of the connecting block 100 to meet the welding requirements, and the generated molten pool will not spread along the second direction to the body portion 110 of the connecting block 100, thereby ensuring that the connecting block 100 has a relatively high structural strength and the contact interface between the body portion 110 and the connecting portion 120 is intact. In some embodiments, B2 = c2 = d2 can be set. At this time, the axes of each first mounting hole and each second mounting hole on the connecting block 100 coincide with the center of the connecting block 100 along the second direction, and both ends of each connecting portion 120 along the second direction extend to both ends of the body portion 110 along the second direction, that is, one outer wall of each connecting portion 120 along the second direction is flush with the third side wall 1103 of the body portion 110 along the second direction, and the other outer wall of each connecting portion 120 along the second direction is flush with the fourth side wall 1104 of the body portion 110 along the second direction. When the connecting portion 120 and the body portion 110 are combined, the operation is convenient, and the connecting block 100 is easy to process and manufacture.

[0131] Optionally, in this embodiment, the value range of c2 is: 2 mm ≤ c2 ≤ 30 mm. For example, the value of c2 can be 2 mm, 4 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, etc. The value range of d2 is: 2 mm ≤ d2 ≤ 30 mm. For example, the value of d2 can be 2 mm, 4 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, etc.

[0132] Continue to refer to Figure 9 and Figure 10 , on the end surface of each connecting portion 120 facing away from the body portion 110, a second sinking platform 121 is provided. The second sinking platform 121 is coaxial with the second mounting hole provided thereon. The second sinking platform 121 is also a circular sinking platform, and the diameter of the second sinking platform 121 is greater than the diameter of the second mounting hole. By providing the second sinking platform 121, the welding portion 130 will not exceed the end surface of the connecting block 100 facing away from the cover plate body 300, which is convenient for subsequent connection of the connecting block 100 with the bus bar (note: the bus bar is made of aluminum material, and the bus bar is welded to the body portion 110 of the connecting block 100). The second sinking platform 121 includes a horizontal step surface. Along the first direction, the width of the horizontal step surface is W2. The following relationship is satisfied among J3, W2, and A2: J3 / 2 < W2 ≤ A2 / 2. The value of W2 can be 0.15 mm, 0.3 mm, 1.0 mm, 2.0 mm, etc. This ensures that the welding portion 130 is completely embedded in the second sinking platform 121 and will not interfere with the bus bar, affecting the welding of the body portion 110 and the bus bar.

[0133] Along the third direction, the size of the connection part 120 is G2, the depth of the first depression 111 is H01, the depth of the second depression 121 is H02, and the size of the main body 110 is H0, wherein G2 and H01 satisfy: G2 = H01, so that the connection part 120 is just embedded in the first depression 111 of the main body 110, ensuring that the end surface of the connection part 120 facing away from the cover plate body 300 is flush with the end surface of the main body 110 facing away from the cover plate body 300, and the appearance of the connection block 100 is regular and not easy to scratch other structural parts. H01, H02 and 0H satisfy: H02 < H01 ≤ H0, ensuring that the connection part 120 and the main body 110 are reasonably distributed in the connection block 100.

[0134] Optionally, in this embodiment, the value range of H02 is: 0.1mm≤H02<0.3mm. For example, the value of H02 can be 0.1mm, 0.2mm or 0.3mm, etc. The value range of H0 is: 1.0mm≤H0≤5.0mm. For example, the value of H0 can be 1.0mm, 2.0mm, 3.0mm, 4.0mm or 5.0mm, etc.

[0135] Furthermore, the penetration depth of the weld 130 is K2. K2, G2 and H0 satisfy: K2<G2≤H0, thereby ensuring that the weld 130 is located in the connection part 120 and does not penetrate into the main body 110 along the third direction, thereby ensuring that the welding quality of the weld 130 is good and the connection strength is high. The value range of K2 is: 0.3mm≤K2≤0.6mm. For example, the value of K2 can be 0.3mm, 0.4mm, 0.5mm or 0.6mm, etc.

[0136] This embodiment also provides a battery, comprising a housing, an electrode group and the battery cover. By adopting the battery cover, the battery can be guaranteed to have high reliability and good sealing performance.

[0137] Optionally, the battery can be a blade battery, with openings provided at opposite ends of the housing, two battery covers provided, the two battery covers are buckled at one opening respectively, and the pole 200 is accommodated in the housing. The pole 200 on one of the battery covers is a positive pole 200, and the pole 200 on the other battery cover is a negative pole 200, the positive pole ear of the pole group is connected to the positive pole 200, and the negative pole ear of the pole group is connected to the negative pole 200.

[0138] The value ranges of the above parameters A2, A3, B2, a2, b2, c2, d2, e, J3, J4, K2, G2 and H0 are verified for batteries in some specific samples. Details are shown in Table 3.

[0139] Table 3

[0140]

[0141] As can be seen from the above results, the value of A2 in Sample 1 does not meet the dimensional limit of J3 / 2 < A2 ≤ a2 / 2, the value of A3 does not meet J3 / 2 < A3 ≤ e / 4, the value of B2 does not meet the dimensional limit of J4 / 2 < B2 ≤ c2, the volume of the connecting part 120 is small. After the connecting part 120 is welded to the riveting part 231, a part of the main body part 110 in the connecting block 100 melts, the intersection interface between the connecting part 120 and the main body part 110 in the first direction is damaged, the intersection interface between the connecting part 120 and the main body part 110 in the second direction is also damaged, the mechanical properties of the connecting block 100 decline, the reliability decreases, and the battery is defective.

[0142] All parameters in Sample 2, Sample 3, Sample 4, Sample 5, Sample 6, Sample 8, Sample 9 and Sample 10 meet the requirements. After the connecting part 120 is welded to the riveting part 231, the main body part 110 in the connecting block 100 does not melt, the intersection interface between the connecting part 120 and the main body part 110 is normal, the mechanical properties of the connecting block 100 are high, the reliability is high, and the welding part 130 between the connecting part 120 and the riveting part 231 has good quality, without welding quality problems such as explosion points and false soldering, the sealing performance meets the requirements, and the battery is good.

[0143] In Sample 7, the value of G2 does not meet the dimensional limit of K2 < G2 ≤ H0, the volume of the connecting part 120 is small. After the connecting part 120 is welded to the riveting part 231, a part of the main body part 110 in the connecting block 100 melts, the intersection interface between the connecting part 120 and the main body part 110 in the third direction is damaged, the mechanical properties of the connecting block 100 decline, the reliability decreases, and the battery is defective.

[0144] Next, the value ranges of the above parameters a2, b2, c2, d2, and e are verified for the batteries in some specific samples. The details are shown in Table 4.

[0145] Table 4

[0146]

[0147] As can be seen from the above results, the value of a2 in Sample 1 is less than the lower limit of 2mm ≤ a2 ≤ 30mm. After the connecting block 100 is riveted to the pole 200 on one side in the first direction (i.e., the side of the connecting block 100 with the dimension of a2), it cracks, the product cannot be used, and the battery is defective.

[0148] The value of b2 in Sample 2 is less than the lower limit of 2mm ≤ b2 ≤ 30mm. After the connecting block 100 is riveted to the pole 200 on the other side in the first direction (i.e., the side of the connecting block 100 with the dimension of b2), it cracks, the product cannot be used, and the battery is defective.

[0149] In Sample 3, the value of c2 is less than the lower limit of 2 mm ≤ c2 ≤ 30 mm. After the side of the connecting block 100 along the second direction (i.e., the side of the connecting block 100 with the dimension of c2) is riveted to the pole 200, it expands and cracks, and the product cannot be used, resulting in a defective battery.

[0150] In Sample 4, the value of d2 is less than the lower limit of 2 mm ≤ d2 ≤ 30 mm. After the other side of the connecting block 100 along the second direction (i.e., the side of the connecting block 100 with the dimension of d2) is riveted to the pole 200, it expands and cracks, and the product cannot be used, resulting in a defective battery.

[0151] In Sample 5, the value of e is less than the lower limit of 5 mm ≤ e ≤ 80 mm. Although after the pole 200 is riveted to the connecting block 100, the connecting block 100 does not expand and crack, and the welding quality of the connecting portion 120 and the riveting portion 231 is also high, and the sealing performance meets the requirements, but the exposed body portion 110 in the connecting block 100 is less, and the space for welding the body portion 110 to the bus bar is insufficient. The weld seam during the welding of the body portion 110 to the bus bar may enter the intersection interface of the body portion 110 and the connecting portion 120, which will also affect the mechanical strength of the connecting block 100, reduce the reliability, and result in a defective battery.

[0152] In Samples 6 to 14, the values of a2, b2, c2, d2, and e are all within their dimensional limits. After the connecting block 100 is riveted to the pole 200, there will be no problem of expansion and cracking. After riveting, the flatness of the connecting block 100 is good, and the riveting is qualified. Further, after the connecting portion 120 of the connecting block 100 is welded to the riveting portion 231 of the pole 200, the welding quality between the two is good, the battery passes the helium leak detection, the sealing performance is good, and there is enough space on the connecting block 100 for connection to the bus bar, and the battery is good.

[0153] The rest of the structures in this embodiment are the same as those in Embodiment 1 and will not be elaborated here.

[0154] Obviously, the above is only the preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

[0155] Note that in the description of this specification, the descriptions referring to the reference terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A battery cover, characterized in that: include: Cover plate body; A connecting block, comprising a main body and a connecting part, wherein the main body and the connecting part are an integral structure and are made of different metal materials, the main body is provided with a through first mounting hole, the connecting part is embedded in at least a portion of the inner wall of the first mounting hole, and a first seam is formed between the connecting part and at least a portion of the inner wall of the first mounting hole, the connecting part is provided with a through second mounting hole, and the centers of the first mounting hole and the second mounting hole are coaxial; A pole, one end of the pole passes through the cover plate body, the first mounting hole, and the second mounting hole and is riveted to the body part or the connecting part, one end of the pole riveted to the body part or the connecting part is expanded along the radial direction of the first mounting hole to form a riveted part, the riveted part and the connecting part are made of the same metal material, and the second seam of the riveted part and the connecting part is welded to form a welded part; Wherein, the distance between the second seam and the first seam along the first direction is greater than half of the weld width of the weld; the distance between the second seam and the first seam along the second direction is greater than half of the weld width of the weld; The size of the connection portion along the third direction is greater than the penetration depth of the welding portion, and the first direction, the second direction and the third direction are perpendicular to each other.

2. The battery cover according to claim 1, characterized in that: The pole is provided with one, the connecting portion is provided with one, the first mounting hole on the main body portion and the second mounting hole on the connecting portion are both provided with one, and the pole, the first mounting hole and the second mounting hole correspond to each other one by one; Along the first direction, the distance between the second seam and the first side wall of the main body is a1, the distance between the second seam and the second side wall of the main body is b1, the distance between the second seam and the first seam is A1, and the weld width of the weld is J1; Among them, a1, A1 and J1 satisfy: J1 / 2<A1≤a1 / 2; b1, A1 and J1 satisfy: J1 / 2<A1≤b1 / 2; The value range of a1 is: 4mm≤a1≤40mm; The value range of b1 is: 4mm≤b1≤40mm; The value range of J1 is: 0.3mm≤J1≤1.0mm.

3. The battery cover according to claim 2, characterized in that: Along the second direction, the distance between the second seam and the third side wall of the main body is c1, the distance between the second seam and the fourth side wall of the main body is d1, the distance between the second seam and the first seam is B1, and the weld width of the weld is J2, J1=J2; Among them, c1, B1 and J2 satisfy: J2 / 2<B1≤c1; d1, B1 and J2 satisfy: J2 / 2<B1≤d1; The value range of c1 is: 2mm≤c1≤40mm; The value range of d1 is: 2mm≤d1≤40mm.

4. The battery cover according to claim 2, characterized in that: A first sink is provided on the inner wall of the first mounting hole, the connecting portion is embedded in the first sink, a second sink is provided on the end surface of the connecting portion away from the main body, the cross section of the second sink is circular, the second sink is coaxial with the second mounting hole, the diameter of the second sink is larger than the diameter of the second mounting hole; the second sink includes a horizontal step surface; Along the first direction, the width of the horizontal step surface is W1, and J1, W1 and A1 satisfy: J1 / 2<W1≤A1 / 2.

5. The battery cover according to claim 4, characterized in that: Along the third direction, the size of the connecting portion is G1, the depth of the first sink is H1, the depth of the second sink is H2, the size of the main body is H, and the penetration depth of the welding portion is K1; Among them, H1, H2 and H satisfy: H2<H1≤H; G1 and H1 satisfy: G1=H1; K1, G1 and H satisfy: K1<G1≤H; The value range of H2 is: 0.1mm≤H2<0.3mm; The value range of K1 is: 0.3mm≤K1≤0.6mm; The value range of H is: 1.0mm≤H≤5.0mm.

6. The battery cover according to claim 2, characterized in that: There are two poles, two connecting parts, each connecting part is provided with a second mounting hole, and there are two first mounting holes on the main body, and the poles, the first mounting holes and the second mounting holes correspond to each other; a first seam I is formed between one of the connecting parts and the inner wall of the first mounting hole corresponding to it, and a second seam I is formed between the rivet part of the pole corresponding to it; a first seam II is formed between the other connecting part and the inner wall of the first mounting hole corresponding to it, and a second seam II is formed between the rivet part of the pole corresponding to it; the first seam I and the second seam I are close to the first side wall of the main body, and the first seam II and the second seam II are close to the second side wall of the main body; Along the first direction, the distance between the second seam I and the first side wall is a2, the distance between the second seam II and the second side wall is b2, the distance between the second seam I and the second seam II on the sides close to each other is e; the distance between the second seam I close to the first side wall and the first seam I, and the distance between the second seam II close to the second side wall and the first seam II are both A2; the distance between the second seam I and the first seam I on the side close to each other of the two connecting parts, and the distance between the second seam II and the first seam II on the side close to each other of the two connecting parts are both A3, and the weld width of the weld is J3; Among them, a2, A2 and J3 satisfy: J3 / 2<A2≤a2 / 2; b2, A2 and J3 satisfy: J3 / 2<A2≤b2 / 2; e, A3 and J3 satisfy: J3 / 2<A3≤e / 4; The value range of a2 is: 2mm≤a2≤30mm; The value range of b2 is: 2mm≤b2≤30mm; The value range of e is: 5mm≤e≤80mm; The value range of J3 is: 0.3mm≤J3≤1.0mm.

7. The battery cover according to claim 6, characterized in that: Along the second direction, the distances between the second seam I, the second seam II and the third side wall of the main body are both c2, and the distances between the second seam I, the second seam II and the fourth side wall of the main body are both d2; the distance between the second seam I and the first seam I, and the distance between the second seam II and the first seam II are both B2, and the weld width of the weld is J4, J4=J3; Among them, c2, B2 and J4 satisfy: J4 / 2<B2≤c2; d2, B2 and J4 satisfy: J4 / 2<B2≤d2; The value range of c2 is: 2mm≤c2≤30mm; The value range of d2 is: 2mm≤d2≤30mm.

8. The battery cover according to claim 6, characterized in that: The inner wall of each of the first mounting holes on the main body is provided with a first sink, the two connecting parts are respectively embedded in one of the first sinks, and the end surface of the connecting part away from the main body is provided with a second sink, the cross section of the second sink is circular, the second sink is coaxial with the second mounting hole, and the diameter of the second sink is larger than the diameter of the second mounting hole; the second sink includes a horizontal step surface; Along the first direction, the width of the horizontal step surface is W2, and J3, W2 and A2 satisfy: J3 / 2<W2≤A2 / 2.

9. The battery cover according to claim 8, characterized in that: Along the third direction, the size of the connecting portion is G2, the depth of the first sink is H01, the depth of the second sink is H02, the size of the main body is H0, and the penetration depth of the welding portion is K2; Among them, H01, H02 and 0H satisfy: H02<H01≤H0; G2 and H01 satisfy: G2=H01; K2, G2 and H0 satisfy: K2<G2≤H0; The value range of H02 is: 0.1mm≤H02<0.3mm; The value range of K2 is: 0.3mm≤K2≤0.6mm; The value range of H0 is: 1.0mm≤H0≤5.0mm.

10. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 9.

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