Cover plate assembly, battery pack and electric device

Abstract

The application relates to the technical field of batteries, in particular to a cover plate assembly, a battery pack and an electric equipment. The cover plate assembly comprises a cover plate and a pole; the cover plate comprises a first cover plate and a second cover plate; the first cover plate and the second cover plate are oppositely arranged; the pole is arranged on the second side of the cover plate; in the thickness direction of the cover plate, one end of the pole at least partially penetrates through the first cover plate, the other end of the pole at least partially penetrates through the second cover plate, and the two ends of the pole are respectively connected with pole groups of different polarities. The cover plate assembly can be quickly and conveniently connected in series without other redundant components, the connection process is simple and convenient, time and labor are saved, and the cost can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cover plate assembly, a battery pack, and an electrical device. Background Technology

[0002] Assembling multiple cells in series can produce a battery pack with a larger current. However, series assembly requires components such as busbars to connect the cells, resulting in too many parts, a complicated assembly process, and high costs. Summary of the Invention

[0003] In view of this, the present invention aims to at least partially solve one of the technical problems in the related art. To this end, the present invention provides a cover plate assembly, a battery pack, and an electrical device that can be assembled in series relatively quickly without requiring any other redundant parts. The series assembly process is simple and quick, saving time and effort, and can effectively reduce costs.

[0004] To solve the above-mentioned technical problems, the present invention is implemented as follows: According to one aspect of the present invention, a cover plate assembly is provided, comprising: The cover plate includes a first cover plate and a second cover plate; the first cover plate and the second cover plate are disposed opposite to each other; The pole post is located on the second side of the cover plate; In the thickness direction of the cover plate, one end of the pole passes through the first cover plate at least partially, the other end of the pole passes through the second cover plate at least partially, and the two ends of the pole are respectively connected to pole groups of different polarities.

[0005] In some of these embodiments, the pole post includes a first pole post and a second pole post; The first pole extends at least partially through the second side of the cover plate, and the second pole extends at least partially through the second side of the cover plate. The end of the first pole away from the first cover plate is connected to the end of the second pole away from the second cover plate, and the first pole and the second pole have different polarities.

[0006] In some embodiments, it further includes at least two first plastic parts and at least two second plastic parts; The second plastic parts are all disposed on the second side of the cover plate, and the second plastic parts are respectively sleeved on at least a portion of the first pole post and the second pole post; Two first plastic parts are disposed on the first and third sides of the cover plate, and the first plastic parts are provided with through holes. The pole at least partially passes through the cover plate and the through holes.

[0007] In some embodiments, a welding area is formed around the connection point of the first pole and the second pole in the circumferential direction of the pole; In the thickness direction of the cover plate, the dimension from the side of the welding area near the cover plate to the second plastic part is a, where a satisfies: 0.5mm≤a≤10mm.

[0008] In some embodiments, in the thickness direction of the cover plate, the size of the welding area is B, and the size of the welding area located at the first pole post or the second pole post is B1, wherein B and B1 satisfy at least one of (1) and (2): (1) B1≥0.35mm; (2) 0.3≤B1 / B≤0.7.

[0009] In some of these embodiments, in the length and / or width direction of the cover plate, the effective penetration depth of the welded area is A1, and the maximum penetration depth of the welded area is A, wherein A and A1 satisfy at least one of (3) and (4): (3) A1≥0.3mm; (4) 0.2≤A1 / A≤1.

[0010] In some of these implementations, at least two connecting rings are also included; The two connecting rings are respectively disposed on the first and third sides of the cover plate, and the connecting rings are located between the cover plate and the first plastic part; When the first pole at least partially passes through the first cover plate from the second side of the cover plate, and the second pole at least partially passes through the second cover plate from the second side of the cover plate, the first pole is connected to the connecting ring located on the first side, and the second pole is connected to the connecting ring located on the third side.

[0011] In some of these embodiments, at least two seals are also included; The two seals are located on the first and third sides of the cover plate; When the pole and the connecting ring are connected, the seal is located between the connecting ring and the cover plate.

[0012] In some embodiments, a protrusion is provided on the first cover plate and the second cover plate located on the second side of the cover plate; When the pole at least partially passes through the protrusion, the second plastic part is at least partially located between the protrusion and the pole.

[0013] In some embodiments, the first plastic part has a side plate on a first side and / or a third side away from the cover plate; The side plate is located on one side edge of the first plastic part in the width direction.

[0014] According to a second aspect of the present invention, a battery pack is provided, comprising: the battery cell described in any embodiment of the first aspect of the present invention.

[0015] According to a third aspect of the present invention, the present invention provides an electrical device comprising: a battery cell as described in any embodiment of the first aspect of the present invention; And / or, the battery pack described in the second aspect of the present invention.

[0016] Implementing the technical solution of the present invention has at least the following beneficial effects: 1. In this invention, by setting a first cover plate and a second cover plate relative to each other, and setting a pole post between the first cover plate and the second cover plate, the two ends of the pole post are respectively connected to pole groups of different polarities, thereby enabling the battery cells to be assembled in series more quickly without the need for other extra parts. The series assembly process is simple and quick, saving time and effort, and can effectively reduce costs.

[0017] 2. In some preferred embodiments of the present invention, in the thickness direction of the cover plate, the distance from the side of the welding area close to the first cover plate or the second cover plate to the second plastic part is within a certain range, thereby effectively ensuring that the heat generated during welding of the first pole and the second pole has the least impact on the second plastic part; the heat generated during welding will not cause the second plastic part to melt, affecting the overall performance of the cover plate assembly, and can also save raw materials and reduce costs.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0020] Figure 1 The diagram shows the structure of the cover plate assembly provided by the present invention. Figure 1 .

[0021] Figure 2 The diagram shows the structure of the cover plate assembly provided by the present invention. Figure 2 .

[0022] Figure 3 The diagram shown is a front view of the cover plate assembly provided by the present invention.

[0023] Figure 4 The diagram shown is a side view of the cover plate assembly provided by the present invention.

[0024] Figure 5 The diagram shown is an exploded view of the cover plate assembly provided by the present invention.

[0025] Figure 6 The diagram shown is a top / bottom view of the cover plate assembly provided by the present invention.

[0026] Figure 7 The present invention is shown. Figure 6 The provided cover plate assembly AA' cross-sectional view.

[0027] Figure 8 The present invention is shown. Figure 7 Partial cross-sectional views are provided.

[0028] Figure 9 The present invention is shown. Figure 7 Provided local magnification Figure 1 .

[0029] Figure 10 The present invention is shown. Figure 7 Provided local magnification Figure 2 .

[0030] Figure 11 The diagram shown is a schematic diagram of the cover plate structure provided by the present invention.

[0031] Figure 12 The diagram shown is a schematic representation of the structure of the first plastic part provided by the present invention. Figure 1 .

[0032] Figure 13 The diagram shown is a schematic representation of the structure of the first plastic part provided by the present invention. Figure 2 .

[0033] Explanation of reference numerals in the attached figures: 100—Cover plate assembly; 110A – First side; 110B – Second side; 110C – Third side; 110 – Cover plate; 111 – First cover plate; 112 – Second cover plate; 1101 – Protrusion; 120 – Pole post; 121 – First pole post; 122 – Second pole post; 130 – Connecting ring; 140 – First plastic part; 141 – Through hole; 142 – Side plate; 150 – Second plastic part; 160 – Seal; 170 – Welding area.

[0034] The accompanying drawings have illustrated specific embodiments of the invention, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0035] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges or individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0037] Unless otherwise specified, all embodiments and optional embodiments of the present invention can be combined with each other to form new technical solutions.

[0038] Unless otherwise specified, all technical features and optional technical features of this invention can be combined to form new technical solutions.

[0039] Unless otherwise specified, all steps of the present invention may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0040] Unless otherwise specified, the terms "comprising" and "including" as used in this invention can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0041] A battery cell comprises components such as a casing, electrode assembly, and cover plate. In practical use, multiple cells need to be assembled in series or parallel to enable the battery to meet the operating voltage or current of the electrical device. Currently, assembling multiple cells typically requires a busbar. The positive and negative terminals of multiple cells are connected to the busbar via adapter plates to achieve battery assembly. However, this assembly method involves many parts and complex assembly processes. After transporting and assembling the manufactured cells, they are then connected in series, resulting in a time-consuming assembly process.

[0042] In view of the technical problems existing in the prior art, the present invention provides a cover plate assembly, a battery pack and an electrical device, which can enable the battery cells to be assembled in series relatively quickly without the need for other extra parts. The series assembly process is simple and quick, saving time and effort, and can effectively reduce costs.

[0043] The specific technical solution of the present invention is as follows: In some embodiments of the present invention, a cover plate assembly is provided, including: a cover plate 110 and a pole post 120; the cover plate 110 includes a first cover plate 111 and a second cover plate 112; the first cover plate 111 and the second cover plate 112 are disposed opposite to each other.

[0044] The pole post 120 is disposed on the second side 110B of the cover plate 110; in the thickness direction of the cover plate 110, one end of the pole post 120 passes through the first cover plate 111 at least partially, the other end of the pole post 120 passes through the second cover plate 112 at least partially, and the two ends of the pole post 120 are respectively connected to pole groups of different polarities.

[0045] refer to Figure 1 , Figure 2 and Figure 3 As an example, the cover plate 110 and the pole post 120 are made of metal materials such as aluminum, copper, aluminum alloy, or copper alloy. The materials of the cover plate 110 and the pole post 120 can be the same or different. It is understood that the planar shape of the first cover plate 111 and the second cover plate 112, viewed from above or below, can be any one of rectangular, trapezoidal, elliptical, or circular shapes. In a preferred embodiment, the shapes of the first cover plate 111 and the second cover plate 112 can be the same. In the thickness direction of the cover plate 110, the first cover plate 111 and the second cover plate 112 can be arranged opposite each other, with a certain spatial distance between them. The first cover plate 111 and the second cover plate 112 can also be provided with opposite through holes a, allowing the pole post 120 to pass through the through holes a.

[0046] refer to Figure 4As an example, in the thickness direction of the cover plate 110, the pole post 120 is disposed on the second side 110B of the cover plate 110, that is, between the relative space of the first cover plate 111 and the second cover plate 112; one end of the pole post 120 can be inserted at least partially from the second side 110B of the cover plate 110 into the through hole a of the first cover plate 111. It is understood that the pole post 120 and the first cover plate 111 are not connected or conductive, that is, the pole post 120 and the first cover plate 111 are insulated from each other. For example, an insulating coating (such as a polymer insulating layer such as rubber, polyurethane, or polyolefin) can be provided between the pole post 120 and the first cover plate 111; similarly, the other end of the pole post 120 can be inserted at least partially from the second side 110B of the cover plate 110 into the through hole a of the second cover plate 112, and the pole post 120 and the second cover plate 112 are also insulated from each other. The two ends of the terminal 120 are connected to the positive and negative tabs of the electrode group, respectively. That is to say, the cell has at least two housings, namely housing A and housing B. Housing A and housing B are respectively provided with open ends. The cover plate assembly 100 is provided at the open ends of housing A and housing B. The first cover plate 111 is connected to the open end of housing A, and the second cover plate 112 is connected to the open end of housing B. It can be understood that both housing A and housing B are provided with electrode groups. One end of the terminal 120 can be connected to the negative tab of the electrode group in housing A, and the other end of the terminal 120 is connected to the positive tab of the electrode group in housing B; or, one end of the terminal 120 can be connected to the positive tab of the electrode group in housing A, and the other end of the terminal 120 is connected to the negative tab of the electrode group in housing B.

[0047] The cover plate assembly provided by the present invention, by arranging a first cover plate and a second cover plate relative to each other, and providing a pole post between the first cover plate and the second cover plate, with the two ends of the pole post respectively connected to pole groups of different polarities, can enable the battery cells to be assembled in series relatively quickly without the need for other extra parts. The series assembly process is simple and quick, saving time and effort, and can effectively reduce costs.

[0048] In some embodiments, the pole 120 includes a first pole 121 and a second pole 122; the first pole 121 passes through the first cover plate 111 at least partially from the second side 110B of the cover plate 110, and the second pole 122 passes through the second cover plate 112 at least partially from the second side 110B of the cover plate 110; the end of the first pole 121 away from the first cover plate 111 is connected to the end of the second pole 122 away from the second cover plate 122, and the polarities of the first pole 121 and the second pole 122 are different.

[0049] refer to Figure 4As an example, the pole 120 can be configured as a first pole 121 and a second pole 122. In a preferred embodiment, the first pole 121 and the first pole 122 have the same shape and appearance. The materials of the first pole 121 and the second pole 122 can be the same or different, and no specific limitation is made here. The first pole 121 and the second pole 122 are both disposed on the second side 110B of the cover plate 110. The first pole 121 passes through the first cover plate 111 at least partially, and the second pole 122 passes through the second cover plate 112 at least partially. In the thickness direction of the cover plate 110, the end of the first pole 121 away from the first cover plate 111 and the end of the second pole 122 away from the second cover plate 112 are connected on the second side 110B. Wherein, if the first pole 121 is a positive pole, then the second pole 122 is a negative pole, and if the first pole 121 is a negative pole, then the second pole 122 is a positive pole.

[0050] In some embodiments, the cover plate assembly 100 further includes at least two first plastic parts 140 and at least two second plastic parts 150; the second plastic parts 150 are all disposed on the second side 110B of the cover plate 110, and the two second plastic parts 150 are respectively sleeved on at least a portion of the first pole post 121 and the second pole post 122.

[0051] Two first plastic parts 140 are provided on the first side 110A and / or the third side 110C of the cover plate 110. The first plastic parts 140 are provided with through holes 141. The pole post 120 passes through the cover plate 110 and the through holes 141 at least partially.

[0052] refer to Figure 4 As an example, the first plastic part 140 and the second plastic part 150 can be made of polyethylene, polypropylene, polyurethane, polyvinyl chloride, polyvinylidene fluoride, polyepoxy resin or chloroprene rubber, etc., and have good insulation properties. The number of first plastic parts 140 can be two, three or more, and the number of second plastic parts 150 can be two, three or more. The second plastic parts 150 are disposed on the second side 110B of the cover plate 110. In a preferred embodiment, the second plastic parts 150 are sleeved on at least a portion of the first pole post 121 and the second pole post 122. When the first pole post 121 passes at least partially through the first cover plate 111, a portion of the second plastic parts 150 is sandwiched between the first pole post 121 and the first cover plate 111. Similarly, when the second pole post 122 passes at least partially through the second cover plate 122, a portion of the second plastic parts 150 is sandwiched between the second pole post 122 and the second cover plate 122. The second plastic parts 150 can effectively insulate and seal the cover plate 110 and the pole post 120.

[0053] Continue to refer to Figure 4The first plastic part 140 is disposed on the first side 110A and / or the third side 110C of the cover plate 110. The first plastic part 140 can be adapted to the cover plate 110. The first plastic part 140 and the first cover plate 111 and the second cover plate 112 can be detachably connected by means of snap-fit, pin, etc., or can be fixedly connected by means of welding, bonding, etc. The first plastic part 140 is provided with a through hole 141 that matches the above-mentioned through hole a. When the first plastic part 140 and the first cover plate 111 are connected, the first pole post 121 can at least partially pass through the through hole a and the through hole 141 in sequence. When the first plastic part 140 and the second cover plate 112 are connected, the first pole post 122 can at least partially pass through the through hole a and the through hole 141 in sequence. With the first plastic part 140 and the second plastic part 150 respectively disposed on both sides of the first cover plate 111 and the second cover plate 112, they can effectively serve as the insulating cover plate 110 and the pole post 120, while also ensuring that the cover plate 110 has good sealing performance.

[0054] In some embodiments, in the circumferential direction of the pole post 120, a welding area 170 is formed around the connection position of the first pole post 121 and the second pole post 122; in the thickness direction of the cover plate 110, the dimension from the side of the welding area 170 near the cover plate 110 to the second plastic part 150 is a, where a satisfies: 0.5mm≤a≤10mm.

[0055] refer to Figure 5 , Figure 6 and Figure 7As an example, in the second side 110B of the cover plate 110, the side of the first pole post 121 away from the first cover plate 111 and the side of the second pole post 122 away from the second cover plate 112 are connected by welding. A welding area 170 is formed at the connection point of the first pole post 121 and the second pole post 122 in the circumferential direction of the pole post, or in the length or width direction of the connecting block 130. In the thickness direction of the cover plate 110, the distance from the side of the welding area 170 near the first cover plate 111 or the second cover plate 112 to the second plastic part 150 is 'a', that is, the distance from the side of the welding area 170 near the first cover plate 111 or the second cover plate 112 to the side of the second plastic part 150 away from the first cover plate 111 or the second cover plate 112 is 'a'. 'a' can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0mm. The value of d can be any one of 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm, or any point value between any two. By limiting the range of d, it can be effectively ensured that the heat generated during welding of the first pole post 121 and the second pole post 122 has the least impact on the second plastic part 150. If it is less than the above range, the heat generated during welding when welding forms the welding area 170 may melt the second plastic part 150, thereby affecting the overall performance of the cover plate assembly 100. If it is greater than the above range, the second plastic part 150 may not be able to protect the first pole post 121 and / or the second pole post 122 well, making the first pole post 121 and / or the second pole post 122 susceptible to external damage, and the length of the first pole post 121 and / or the second pole post 122 may be too long, wasting raw materials and increasing costs.

[0056] For example, tests were conducted by setting up embodiments, wherein the difference between embodiments b1 to b13 is only the value of a, and the value of a and the test results are shown in Table 1.

[0057] Table 1 As can be seen from Table 1, when the value of a is within the above range, the second plastic part does not melt after welding, and there is no short circuit between the pole and the cover plate.

[0058] In some embodiments, the weld area 170 has a size of B in the thickness direction of the cover plate 110, and the weld area 170 has a size of B1 at the first pole post 121 or the second pole post 122. B and B1 satisfy at least one of the following characteristics: B1≥0.35mm; 0.3≤B1 / B≤0.7.

[0059] refer to Figure 10As an example, in the thickness direction of the cover plate 110, the size of the welding area 170, i.e., the maximum size of the welding area 170, is B. The maximum size B1 of the welding area 170 on the first pole post 121 or the second pole post 122 can be any point value of 0.35mm, 0.36mm, 0.38mm, 0.40mm, 0.50mm and above. B1 / B can be any one of 0.3, 0.31, 0.32, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60 or 0.70 or any point value between any two of them. By limiting the range of any of the above values, the first pole post 121 and the second pole post 122 can be welded firmly, and in the height direction, i.e., in the thickness direction of the cover plate 110, it can meet 1200N 10 times. In a preferred embodiment, when both of the above conditions are met, the first pole post 121 and the second pole post 122 can be firmly connected, the position of the maximum penetration depth will not be significantly shifted, thus affecting the welding strength, and the second plastic part 150 will not be affected.

[0060] For example, embodiments c1 to c15 are set up, wherein the only difference between embodiments c1 to c15 is the value of the dimensions B1, B and B1 / B of the welding area 170. The specific values ​​and test results are shown in Table 2.

[0061] Table 2 In some embodiments, the effective penetration depth of the welding area 170 in the length and / or width direction of the cover plate 110 is A1, and the maximum penetration depth of the welding area 170 is A. A and A1 satisfy at least one of the following characteristics: A1≥0.3mm; 0.2≤A1 / A≤1.

[0062] refer to Figure 10 For example, B1 can be any point value of 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.40mm, 0.50mm and above; A1 / A can be any point value of 0.2, 0.3, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95 or 1.0 or any point value between any two; by limiting the effective weld width, the ratio range between the effective weld width and the maximum weld width can effectively improve the welding strength between the first pole post 121 and the second pole post 122.

[0063] For example, embodiments d1 to d15 are set up, wherein the only difference between embodiments d1 to d15 is the effective weld width of the welding area 170, the ratio between the effective weld width and the maximum weld width, and the specific values ​​and test results are shown in Table 3.

[0064] Table 3 In some embodiments, the cover plate assembly 100 further includes at least two connecting rings 130; the two connecting rings 130 are respectively disposed on a first side 110A and a third side 110C of the cover plate 110, and the connecting rings 130 are located between the cover plate 110 and the first plastic part 140; when the first pole post 121 passes through the first cover plate 111 at least partially from the second side 110B of the cover plate 110, and the second pole post 122 passes through the second cover plate 112 at least partially from the second side 110B of the cover plate 110, the first pole post 121 is connected to the connecting ring 130 located on the first side 110A, and the second pole post 122 is connected to the connecting ring 130 located on the third side 110C.

[0065] refer to Figure 4As an example, the connecting ring 130 can also be made of metal materials such as aluminum, copper, aluminum alloy, or copper alloy. The number of connecting rings 130 can be two, three, or more. In a preferred embodiment, the number of connecting rings 130 matches the number of cover plates 110 or the number of pole posts 120. The connecting rings 130 are disposed on the first side 110A and / or the third side 110C of the cover plate 110. When the first pole post 121 passes through the first cover plate 111, the first pole post 121 and the connecting ring 130 are connected, and the connecting ring 130 and the first pole post 121 are respectively on both sides of the first cover plate 111. The connecting ring 130 allows the first pole post 121 to be securely mounted on the first cover plate 111. It is understood that the connecting ring 130 and the first cover plate 111 are also insulated. In a preferred embodiment, the first... One electrode 121 passes through the through hole 141 in the second plastic part 150, the first cover plate 111, and the first plastic part 140, and connects to the connecting ring 130. The connecting ring 130 and part of the first electrode 121 then clamp the second plastic part 150, the first cover plate 111, and the first plastic part 140, thus ensuring the first electrode 21 is securely mounted on the cover plate 110. Simultaneously, the first plastic part 140 and the second plastic part 150 provide good insulation between the first electrode 121 and the first cover plate 111. Similarly, when the second electrode 122 passes through the second cover plate 112, the second electrode 122 connects to the connecting ring 130, with the connecting ring 130 and the second electrode 122 located on opposite sides of the second cover plate 112. The connecting ring 130 ensures the second electrode 122 is securely mounted on the second cover plate 112. It is understood that the connecting ring 130 and the second cover plate 112 are insulated from each other.

[0066] In some embodiments, the cover plate assembly 100 further includes at least two seals 160; the two seals 160 are disposed on a first side 110A and a third side 110C of the cover plate 110; when the pole post 120 and the connecting ring 130 are connected, the seals 160 are located between the connecting ring 130 and the cover plate 110.

[0067] refer to Figure 4As an example, the seal 160 can be made of materials such as rubber, polyurethane, or epoxy resin, and has good elastic properties. The number of seals 160 can be two, three, or more. The seals 160 are disposed on the first side 110A and / or the third side 110C of the cover plate 110. When the pole post 120 and the connecting ring 130 are connected, the seal 160 is located between the connecting ring 130 and the cover plate 110. The elastic properties of the seal 160 can effectively seal the battery cell, improving the battery cell's sealing performance. When the first pole post 121 is partially inserted into the first cover plate 111 from the second side 110B of the cover plate 110, the sealing member 160 is located between the ends of the first cover plate 111 and the first pole post 121 in the thickness direction of the first cover plate 111. Similarly, when the second pole post 122 is partially inserted into the second cover plate 112 from the second side 110B of the cover plate 110, the sealing member 160 is located between the ends of the second cover plate 112 and the second pole post 122 in the thickness direction of the second cover plate 112. In this way, the sealing member 160 can effectively seal the surface and also insulate the cover plate 110, the first pole post 121, and the second pole post 122.

[0068] In some embodiments, a protrusion 1101 is provided on the first cover plate 111 and the second cover plate 112 located on the second side 110B of the cover plate 110; when the pole post 120 passes through the protrusion 1101 at least partially, the second plastic part 150 is located at least partially between the protrusion 1101 and the pole post 120.

[0069] refer to Figure 8 As an example, on the second side 110B of the cover plate 110, the first cover plate 111 and the second cover plate 112 are respectively provided with protrusions 1101. When the first pole post 121 passes through the protrusion 1101 on the first cover plate 111 at least partially, the second plastic part 150 is at least partially located between the protrusion 1101 and the first pole post 121. When the second pole post 122 passes through the protrusion 1101 on the second cover plate 112 at least partially, the second plastic part 150 is at least partially located between the protrusion 1101 and the second pole post 122.

[0070] In some embodiments, the first plastic part 140 is provided with a side plate 142 on a first side 110A and / or a third side 110C away from the cover plate 110; the side plate 142 is provided on one side edge of the first plastic part 140 in the width direction.

[0071] refer to Figure 9 and Figure 10As an example, the first plastic part 140 has a side plate 142 on the side away from the cover plate. The side plate 142 is also disposed on the edge of the first plastic part 140 in the width direction. The first plastic part 140 with the side plate 142 is disposed on the side of the cover plate 120 with the liquid injection hole, so that during liquid injection, the electrolyte will not contaminate the cover plate assembly 100, thereby affecting the overall performance of the battery.

[0072] In some embodiments, a cover plate assembly 100 is provided, the cover plate assembly 100 including a first cover plate 111, a second cover plate 112, a first pole post 121, a second pole post 122, a first plastic part 140, a second plastic part 150, a connecting ring 130, and a sealing member 160; the first cover plate 111 and the second cover plate 112 are disposed opposite to each other, the first plastic part 140 is respectively disposed on a first side 110A and a third side 110C of the cover plate 110, and the first pole post 121 at least partially passes through the first cover plate 111 and the first plastic part 140 and is located on the cover plate 111. A connecting ring 130 on the first side 110A of the cover plate 10 is connected. A second terminal 122 at least partially passes through the second cover plate 112 and the first plastic part 140, and is connected to the connecting ring 130 on the third side 110C of the cover plate 110. A second plastic part 150 is respectively sleeved on portions of the first terminal 121 and the second terminal 122. The first terminal 121 and the second terminal 122 are connected on the second side 110B of the cover plate 110. Sealing elements 160 are located between the first terminal 121 and the first cover plate 111, and between the second terminal 122 and the second cover plate 112. This cover plate assembly 100 enables the cells to be assembled in series relatively quickly without requiring additional components. The series assembly process is simple and quick, saving time and effort, and effectively reducing costs.

[0073] In some embodiments of the present invention, a battery pack is provided, including: the cover plate assembly of any of the above embodiments.

[0074] In some embodiments of the present invention, an electrical device is provided, including: the cover plate assembly in any of the above embodiments.

[0075] In some embodiments, the electrical device includes the battery pack described in any of the above embodiments.

[0076] Optionally, the battery cell of the battery pack may further include a positive electrode, a negative electrode, and a separator. As an example, the positive electrode includes a positive current collector and a positive active material layer disposed on at least one surface of the positive current collector along its thickness direction. The phrase "positive active material layer disposed on at least one surface of the positive current collector" means that the positive active material layer can be disposed on one surface of the positive current collector along its thickness direction, or on two surfaces of the positive current collector along its thickness direction. Here, "surface" can be the entire area of ​​the positive current collector or a portion of the positive current collector; this application does not have a particular limitation, as long as the purpose of this application is achieved. In this invention, the separator is not particularly limited, as long as the purpose of this invention is achieved. Optionally, the separator includes, but is not limited to, a polymer separator of at least one of polyethylene, polypropylene, polyacrylonitrile, polysulfonyl, polyarylethersulfone, polyvinyl alcohol, and polyvinylidene fluoride.

[0077] As examples, electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, power tools, energy storage devices, amusement equipment, elevators and lifting equipment, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, drop towers, etc. The aforementioned vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle has a battery installed inside, which can be located at the bottom, front, or rear of the vehicle. The battery can be used to power the vehicle; for example, the battery can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller controls the battery's power supply to the motor, for example, to meet the vehicle's power needs during starting, navigation, and driving. The battery can serve not only as the vehicle's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide propulsion.

[0078] The parts of this invention not described in detail are techniques known to those skilled in the art.

[0079] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0080] It should be noted that the terms "and / or" or " / " used herein are merely descriptions of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The singular forms "a," "described," and "the" used in the embodiments of the invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0081] In the detailed description and claims, a list of items connected by the terms "at least one of," "at least one of," "at least one of," or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may contain a single element or multiple elements. Item B may contain a single element or multiple elements. Item C may contain a single element or multiple elements.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cover plate assembly, characterized in that, include: The cover plate includes a first cover plate and a second cover plate; the first cover plate and the second cover plate are disposed opposite to each other; The pole post is located on the second side of the cover plate; In the thickness direction of the cover plate, one end of the pole passes through the first cover plate at least partially, the other end of the pole passes through the second cover plate at least partially, and the two ends of the pole are respectively connected to pole groups of different polarities.

2. The cover plate assembly according to claim 1, characterized in that, The pole includes a first pole and a second pole; The first pole extends at least partially through the second side of the cover plate, and the second pole extends at least partially through the second side of the cover plate. The end of the first pole away from the first cover plate is connected to the end of the second pole away from the second cover plate, and the first pole and the second pole have different polarities.

3. The cover plate assembly according to claim 2, characterized in that, It also includes at least two first plastic parts and at least two second plastic parts; The second plastic parts are all disposed on the second side of the cover plate, and the two second plastic parts are respectively sleeved on at least part of the first pole post and the second pole post; Two first plastic parts are disposed on the first and third sides of the cover plate, and the first plastic parts are provided with through holes, and the pole at least partially passes through the cover plate and the through holes.

4. The cover plate assembly according to claim 3, characterized in that, In the circumferential direction of the pole post, a welding area is formed around the connection position of the first pole post and the second pole post; In the thickness direction of the cover plate, the dimension from the side of the welding area near the cover plate to the second plastic part is a, where a satisfies: 0.5mm≤a≤10mm.

5. The cover plate assembly according to claim 4, characterized in that, In the thickness direction of the cover plate, the size of the welding area is B, and the size of the welding area located at the first pole post or the second pole post is B1, wherein B and B1 satisfy at least one of (1) and (2): (1) B1≥0.35mm; (2) 0.3≤B1 / B≤0.7; And / or, in the length and / or width direction of the cover plate, the effective penetration depth of the welded area is A1, and the maximum penetration depth of the welded area is A, wherein A and A1 satisfy at least one of (3) and (4): (3) A1≥0.3mm; (4) 0.2≤A1 / A≤1.

6. The cover plate assembly according to claim 3, characterized in that, It also includes at least two connecting rings; The two connecting rings are respectively disposed on the first and third sides of the cover plate, and the connecting rings are located between the cover plate and the first plastic part; When the first pole at least partially passes through the first cover plate from the second side of the cover plate, and the second pole at least partially passes through the second cover plate from the second side of the cover plate, the first pole is connected to the connecting ring located on the first side, and the second pole is connected to the connecting ring located on the third side.

7. The cover plate assembly according to claim 6, characterized in that, It also includes at least two seals; The two seals are located on the first and third sides of the cover plate; When the pole and the connecting ring are connected, the seal is located between the connecting ring and the cover plate.

8. The cover plate assembly according to claim 3, characterized in that, The first and second cover plates located on the second side of the cover plate are provided with protrusions; When the pole at least partially passes through the protrusion, the second plastic part is at least partially located between the protrusion and the pole. And / or, the first plastic part has a side plate on a first side and / or a third side away from the cover plate; The side plate is located on one side edge of the first plastic part in the width direction.

9. A battery pack, characterized in that, include: The cover plate assembly according to any one of claims 1 to 8.

10. An electrical appliance, characterized in that, include: The cover plate assembly according to any one of claims 1 to 8; And / or, the battery pack of claim 9.

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