Cover plate assembly and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery. The utility model provides a cover plate assembly and a battery, and the cover plate assembly comprises a cover plate body which is provided with a first pole hole; the first pole body is matched with the first pole hole, the first pole body comprises a first conductor layer and a second conductor layer, a groove is formed in the top of the first conductor layer, the second conductor layer is compounded in the groove, and the top surface of the first conductor layer is flush with the top surface of the second conductor layer; and the second conductor layer is suitable for being welded with the bar. According to the cover plate assembly and the battery provided by the utility model, the problem that the battery capacity is relatively small due to relatively large thickness of the pole column can be solved.

Description

Technical Field

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

[0002] The battery cell includes a shell, a battery cell and a cover assembly, wherein the battery cell is arranged inside the shell, and the cover assembly is sealed at the opening position of the shell. The cover assembly of the battery cell includes a cover and a pole, wherein the pole includes a positive pole and a negative pole. The pole of the battery cell is arranged on the cover, and the pole is electrically connected to the pole ear of the battery cell through a connecting sheet. The poles of multiple battery cells are electrically connected through a bar sheet, and are packaged through the PACK process to form a battery module.

[0003] In the prior art, aluminum is more suitable as a positive electrode material than other metal materials due to its stable chemical properties, good electrical conductivity, easy processing, and good weight-to-strength ratio. Copper is more suitable as a negative electrode material due to its good electrical conductivity, redox properties, and processing performance.

[0004] The material of the tab is usually aluminum, and the pole of the battery cell is connected to the tab by welding. In order to achieve reliable welding between the negative pole and the tab, the negative pole is usually made of composite metal, that is, an aluminum layer is composited on the surface of copper, and a reliable connection can be achieved through the aluminum layer and the tab.

[0005] However, in the prior art, the aluminum layer is usually compounded on the entire top surface of the copper pole, which results in a larger overall thickness of the pole. When the size of the battery module is constant, the larger overall thickness of the pole will lead to a reduction in the internal capacity of the battery cell, thereby reducing the overall capacity of the battery module.

[0006] Therefore, how to solve the problem of small battery capacity caused by large electrode thickness in the prior art has become an important technical problem to be solved by those skilled in the art. Utility Model Content

[0007] In view of this, the utility model provides a cover plate assembly and a battery, which can solve the problem of small battery capacity caused by large pole thickness.

[0008] In a first aspect, the utility model provides a cover plate assembly, comprising:

[0009] The cover plate body is provided with a first pole hole;

[0010] The first pole body cooperates with the first pole hole, and the first pole body includes a first conductor layer and a second conductor layer. The top of the first conductor layer is provided with a groove, and the second conductor layer is compounded in the groove, and the top surfaces of the first conductor layer and the second conductor layer are flush; wherein the second conductor layer is suitable for welding with the bar.

[0011] Beneficial effects:

[0012] The cover plate assembly provided by the utility model has a first pole body including a first conductor layer and a second conductor layer, the first conductor layer and the second conductor layer are compositely formed, and the second conductor layer is composited in the groove of the first conductor layer, and the second conductor layer is used for welding with the bar piece, specifically, the material of the second conductor layer is the same as that of the bar piece, so that the two can be welded together. Different from the composite pole body in the prior art (the second conductor layer in the prior art is composited on the entire top surface of the first conductor layer), the second conductor layer provided by the utility model is not completely composited on the top surface of the first conductor layer, but composited in the groove of the first conductor layer, and the first conductor layer and the second conductor layer are flush with each other. With such a configuration, the top thickness of the first pole body is small without affecting the welding with the bar piece, so that the saved space can be left for the interior of the battery, thereby increasing the capacity of the battery.

[0013] In an optional embodiment, it also includes:

[0014] The first connecting piece includes a pole connecting portion connected to the first pole body and a pole tab connecting portion suitable for connecting to a pole tab of a battery cell.

[0015] In an optional embodiment, a first indentation structure is provided on the first connecting sheet, the first indentation structure is arranged in an arc shape and is arranged around the pole connecting portion; and / or

[0016] The first connecting sheet is provided with a second indentation structure, the second indentation structure is arranged in a straight line, and the second indentation structure is located between the pole lug connection portion and the pole column connection portion.

[0017] Beneficial effects:

[0018] The pole connecting portion and the pole lug connecting portion on the first connecting plate are divided by the first indentation structure and / or the second indentation structure. When the pole lug connecting portion is welded to the pole lug of the battery cell, even if the pole lug connecting portion is deformed, under the action of the first indentation structure and / or the second indentation structure, the deformation of the pole lug connecting portion will not be transmitted to the pole connecting portion, thereby avoiding the problem of unstable connection between the first pole body and the pole connecting portion.

[0019] In addition, the location where the first indentation structure and / or the second indentation structure is provided on the first connecting piece has a relatively small thickness, and when the current exceeds a preset value, the location will fuse. Thus, the location where the first indentation structure and / or the second indentation structure is provided on the first connecting piece can be used as a fuse to provide safety protection.

[0020] In an optional embodiment, the pole connecting portion is provided with a protruding structure, the protruding structure is provided with a through hole, and the lower end of the first pole body is sleeved in the through hole.

[0021] Beneficial effects:

[0022] Since the pole connecting portion is provided with a protruding structure, the protruding structure has a relatively large thickness, which can improve the anti-deformation capability of this position and can improve the connection reliability between the first pole body and the first connecting sheet.

[0023] In an optional embodiment, the cover body is provided with a first mating surface, the first connecting piece has a second mating surface, and along the thickness direction of the cover body, the first mating surface and the second mating surface correspond to each other and are spaced apart;

[0024] The first pole body has a third mating surface, the first connecting piece is provided with a fourth mating surface, and along the thickness direction of the cover body, the third mating surface corresponds to the fourth mating surface, and the two are arranged at intervals;

[0025] Also includes:

[0026] The first elastic sealing component includes a first elastic sealing portion and a second elastic sealing portion, wherein the first elastic sealing portion is filled between the first mating surface and the second mating surface, and the second elastic sealing portion is filled between the third mating surface and the fourth mating surface.

[0027] Beneficial effects:

[0028] The first elastic sealing part of the first elastic sealing member is filled between the first mating surface and the second mating surface, and can play the role of elastic sealing. At the same time, the second elastic sealing part of the first elastic sealing member is filled between the third mating surface and the fourth mating surface. It should be noted that there is a manufacturing error between the first connecting piece and the first pole body. If the third mating surface of the first pole body is directly contacted with the fourth mating surface of the first connecting piece, due to the existence of manufacturing errors, the third mating surface of the first pole body and the fourth mating surface of the first connecting piece may have a gap or prematurely abut against each other, resulting in the problem that the first pole body or the first connecting piece cannot be installed in place. In view of this, the second elastic sealing part of this embodiment is filled between the third mating surface of the first pole body and the fourth mating surface of the first connecting piece, and the second elastic sealing part can play the role of compensating for the manufacturing tolerance. Even if the gap between the third mating surface and the fourth mating surface is unstable due to the manufacturing tolerance, the second elastic sealing part can adapt to the gap between the third mating surface and the fourth mating surface through its own elastic deformation, thereby ensuring that the first pole body or the first connecting piece can be installed in place, and there is reliable sealing between the two.

[0029] In an optional embodiment, the first pole body further has a fifth mating surface, the cover body is provided with a sixth mating surface, and along the thickness direction of the cover body, the fifth mating surface corresponds to the sixth mating surface, and the two are arranged at an interval;

[0030] The first elastic sealing member further includes a third elastic sealing portion, and the third elastic sealing portion is filled between the fifth mating surface and the sixth mating surface.

[0031] Beneficial effects:

[0032] The third elastic sealing portion further improves the sealing between the fifth mating surface and the sixth mating surface, thereby ensuring the sealing between the first pole body and the cover plate body.

[0033] In an optional embodiment, it also includes:

[0034] The first sealing insulating member is arranged between the fifth mating surface and the sixth mating surface. The first sealing insulating member also includes an annular protrusion, which is arranged around the outer periphery of the first pole body.

[0035] In an optional embodiment, the cover plate body is provided with a second pole hole;

[0036] The cover plate assembly further includes a second pole column and a second connecting piece, the second pole column matches the second pole hole, and the second connecting piece includes a pole connecting portion connected to the second pole column and a pole lug connecting portion suitable for connecting to a pole lug of the battery cell;

[0037] The second connecting sheet is provided with a first indentation structure and / or a second indentation structure; wherein,

[0038] The first indentation structure is arranged in an arc shape and is arranged around the pole connecting portion;

[0039] The second indent structure is arranged in a straight line shape, and the second indent structure is located between the pole lug connection portion and the pole connection portion.

[0040] In an optional embodiment, the cover body is provided with a first mating surface, and the second connecting piece has a second mating surface, and along the thickness direction of the cover body, the first mating surface and the second mating surface correspond to each other and are spaced apart;

[0041] The second pole body has a third mating surface, and the second connecting piece is provided with a fourth mating surface. Along the thickness direction of the cover body, the third mating surface corresponds to the fourth mating surface, and the two are arranged at intervals;

[0042] The second pole body also has a fifth mating surface, and the cover body is provided with a sixth mating surface. Along the thickness direction of the cover body, the fifth mating surface corresponds to the sixth mating surface, and the two are arranged at an interval;

[0043] Also includes:

[0044] The second elastic sealing component includes a first elastic sealing portion, a second elastic sealing portion and a third elastic sealing portion, wherein the first elastic sealing portion is filled between the first mating surface and the second mating surface, the second elastic sealing portion is filled between the third mating surface and the fourth mating surface, and the third elastic sealing portion is filled between the fifth mating surface and the sixth mating surface.

[0045] In a second aspect, the utility model provides a battery, comprising a cover plate assembly as described in any one of the above items. With such an arrangement, the battery provided by the utility model can solve the problem of a small battery capacity caused by a large pole thickness. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought by the above-mentioned cover plate assembly, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1This is a schematic diagram of a cover assembly from a first viewing angle according to an embodiment of the utility model;

[0048] Figure 2 A schematic diagram of a cover plate assembly from a second viewing angle according to an embodiment of the utility model;

[0049] Figure 3 A top view of a cover plate assembly according to an embodiment of the utility model;

[0050] Figure 4 for Figure 3 Middle AA section;

[0051] Figure 5 for Figure 4 The enlarged schematic diagram of the middle B part;

[0052] Figure 6 This is a schematic diagram of the structure of the first connecting piece in an embodiment of the utility model;

[0053] Figure 7 This is a schematic diagram of the structure of the first connecting piece of another embodiment of the utility model.

[0054] Description of reference numerals:

[0055] 11. First pole column; 111. Second conductor layer; 112. First conductor layer; 113. Third mating surface; 114. Fifth mating surface; 12. Cover plate body; 121. First mating surface; 122. Sixth mating surface; 13. First connecting piece; 131. Protruding structure; 132. Second mating surface; 133. Fourth mating surface; 134. Pole column connecting part; 135. Ear connecting part; 136. First indentation structure; 137. Second indentation structure; 14. First elastic sealing member; 141. First elastic sealing member; 142. Second elastic sealing member; 143. Third elastic sealing member; 15. First sealing insulating member; 21. Second pole column; 22. Second connecting piece. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0057] Please refer to Figure 1-Figure 7 The cover plate assembly provided in this embodiment includes a cover plate body 12 and a first pole column 11. The cover plate body 12 is used to cover the opening of the battery shell, and the cover plate body 12 is provided with a first pole column hole.

[0058] The first pole hole is used to install the first pole body 11. In this embodiment, the first pole body 11 is inserted into the first pole hole of the cover body 12. Figure 1 , Figure 3 and Figure 4 As shown, the first pole body 11 includes a first conductor layer 112 and a second conductor layer 111, a groove is provided on the top of the first conductor layer 112, the second conductor layer 111 is compounded in the groove, and the top surfaces of the first conductor layer 112 and the second conductor layer 111 are flush with each other; wherein, the second conductor layer 111 is suitable for welding with the bar piece, and in some embodiments, the second conductor layer 111 and the bar piece are made of the same material, for example, both can be made of aluminum.

[0059] It should be noted that in the related art, the pole made of composite metal has the second conductor layer 111 composited on the overall top surface of the first conductor layer 112, which results in a larger thickness of the pole, smaller effective space for the battery to accommodate the battery cells, and smaller battery capacity.

[0060] The cover plate assembly provided in the embodiment is different from the prior art in that the second conductor layer 111 does not cover the entire top surface of the first conductor layer 112, but covers the groove of the first conductor layer 112, and the two are combined together using a composite process. The second conductor layer 111 is suitable for welding with the tab, while the first conductor layer 112 is suitable for connecting with the connecting sheet, thereby achieving conductive connection with the tab of the battery cell.

[0061] Obviously, in the cap plate assembly provided in this embodiment, the second conductor layer 111 is only compounded in the groove of the first conductor layer 112, and the second conductor layer 111 is not compounded in the part outside the groove of the first conductor layer 112, thereby making the overall thickness of the first pole body 11 relatively small. In this way, the saved space can be utilized as the internal space of the battery, thereby solving the problem of small battery capacity caused by large pole thickness.

[0062] In a further embodiment, Figure 2 , Figure 6 and Figure 7 As shown, the cap plate assembly further includes a first connecting piece 13, and the first connecting piece 13 includes a pole connecting portion 134 and a pole tab connecting portion 135. The pole connecting portion 134 is connected to the first pole body 11, and the pole tab connecting portion 135 is used to connect to the pole tab of the battery cell.

[0063] In some embodiments, the pole connecting portion 134 of the first connecting piece 13 may be provided with a through hole, and the lower end of the first pole body 11, that is, the end of the first pole body 11 located inside the battery housing, may first be inserted into the through hole of the first connecting piece 13, and then the two may be connected by welding. The edge of the pole connecting portion 134 may be arc-shaped, the through hole may be provided as a circular through hole, the tab connecting portion 135 may be provided as two, each tab connecting portion 135 may be provided as a long strip, and it may be an integrated structure with the pole connecting portion 134, and the tab of the battery cell may be connected to the tab connecting portion 135 by welding.

[0064] In a further embodiment, a first indentation structure 136 and / or a second indentation structure 137 is provided on the first connecting sheet 13; Figure 6 As shown, the first indentation structure 136 is arranged in an arc shape and is arranged around the pole connection portion 134. In some embodiments, the first indentation structure 136 can be etched on the first connection sheet 13 by an etching process, or can be stamped on the first connection sheet 13 by a stamping process.

[0065] The first indentation structure 136 is set in an arc shape, and the pole connection part 134 is set in the space surrounded by the first indentation structure 136. In this way, the first indentation structure 136 forms a weak part of the first connecting sheet 13, and the pole connection part 134 is separated from the pole lug connection part 135 by the first indentation structure 136. When the pole lug connection part 135 is welded with the pole lug of the battery cell, even if the pole lug connection part 135 is deformed, under the blocking effect of the first indentation structure 136, the deformation of the pole lug connection part 135 will not be transmitted to the pole connection part 134, and thus the pole connection part 134 will not be deformed. The connection reliability between the pole connection part 134 and the pole is guaranteed.

[0066] In some embodiments, the pole connection portion 134 and the tab connection portion 135 may also be separated by a linear second indentation structure 137. Specifically, as shown in FIG. Figure 7 As shown, the transition portion between each pole lug connection portion 135 and the pole post connection portion 134 is provided with the above-mentioned second indentation structure 137, and the second indentation structure 137 also constitutes a weak portion on the first connecting plate 13. When the pole lug connection portion 135 and the pole lug are deformed by welding, the second indentation structure 137 can also prevent the deformation from being transmitted to the pole post connection portion 134, causing the pole post connection portion 134 to be deformed.

[0067] It should be noted that, in this embodiment, either the first indentation structure 136 or the second indentation structure 137 may be disposed on the first connecting sheet 13 , or both may be disposed on the first connecting sheet 13 at the same time.

[0068] In addition, it should be noted that the first indentation structure 136 or the second indentation structure 137 constitutes a weak part of the first connecting piece 13. When the current is large, the indentation structure will first fuse. In view of this, the depth of the first indentation structure 136 or the second indentation structure 137 can be set to a preset depth. When the current on the first connecting piece 13 is greater than the preset value, the first indentation structure 136 or the second indentation structure 137 will fuse. In this way, the first indentation structure 136 or the second indentation structure 137 has the effect of a fuse, which plays a role in safety protection.

[0069] In a further embodiment, Figure 5 As shown, the pole connection part 134 is provided with a protruding structure 131, and a through hole is provided on the protruding structure 131, and the lower end of the first pole body 11 is sleeved in the through hole. Since the pole connection part 134 is provided with the protruding structure 131, the thickness of the pole connection part 134 is relatively large, and the axial depth of the through hole is relatively large. The lower end of the first pole body 11, that is, the end of the first pole body 11 located inside the battery, is sleeved in the through hole, and the contact area between the first pole body 11 and the through hole is relatively large, thereby ensuring the connection reliability between the two. At the same time, since the thickness of the pole connection part 134 is relatively large, it can avoid deformation of this part, which leads to the problem of unstable connection with the pole.

[0070] In some embodiments, the cover body 12 is provided with a first mating surface 121, and the first connecting piece 13 has a second mating surface 132. Along the thickness direction of the cover body 12, the first mating surface 121 and the second mating surface 132 correspond to each other, and the two are arranged at intervals. Specifically, the first mating surface 121 of the cover body 12 is the inner surface of the cover body 12, that is, the surface located inside the battery, and the second mating surface 132 of the first connecting piece 13 is in a face-to-face corresponding relationship with the first mating surface 121, and the two are arranged at intervals.

[0071] The first pole body 11 has a third mating surface 113 , and the first connecting piece 13 is provided with a fourth mating surface 133 . Along the thickness direction of the cover body 12 , the third mating surface 113 and the fourth mating surface 133 correspond to each other and are spaced apart. In some embodiments, the first pole body 11 is configured as a multi-step structure, that is, along the thickness direction of the first pole body 11 or the cover body 12, the first pole body 11 includes multiple column segments with different diameters or cross-sections. For example, along the outer side to the inner side of the cover body 12, the first pole body 11 includes three column segments with successively decreasing diameters or cross-sections, namely the first column segment, the second column segment and the third column segment, wherein the first column segment is located on the outer side of the cover body 12 (on the side outside the battery), the second column segment is located in the first pole hole of the cover body 12, and the third column segment is located on the inner side of the cover body 12 (on the side inside the battery), the third mating surface 113 of the first pole body 11 is the transition surface between the second column segment and the third column segment, and the fourth mating surface 133 of the first connecting piece 13 is in a face-to-face corresponding relationship with the third mating surface 113, and the two are arranged at intervals.

[0072] On this basis, the cover assembly further includes a first elastic seal 14 . The first elastic seal 14 is elastic and made of plastic, rubber, silicone or other materials. The first elastic seal 14 includes a first elastic sealing portion 141 and a second elastic sealing portion 142 .

[0073] The first elastic sealing portion 141 of the first elastic sealing member 14 is filled between the first mating surface 121 and the second mating surface 132, and can play the role of elastic sealing. At the same time, the second elastic sealing portion 142 of the first elastic sealing member 14 is filled between the third mating surface 113 and the fourth mating surface 133, which can not only play the role of elastic sealing, but also play the role of compensating for manufacturing tolerances. The specific reasons are as follows:

[0074] It should be noted that there are manufacturing errors between the first connecting piece 13 and the first pole body 11. If the third mating surface 113 of the first pole body 11 is directly contacted and mated with the fourth mating surface 133 of the first connecting piece 13, due to the existence of manufacturing errors, there may be a gap between the third mating surface 113 of the first pole body 11 and the fourth mating surface 133 of the first connecting piece 13, or they may abut against each other prematurely, resulting in the first pole body 11 or the first connecting piece 13 not being installed properly. In view of this, the second elastic sealing portion 142 of the present embodiment is filled between the third mating surface 113 of the first pole body 11 and the fourth mating surface 133 of the first connecting piece 13. The second elastic sealing portion 142 can compensate for the manufacturing tolerance. Even if the gap between the third mating surface 113 and the fourth mating surface 133 is unstable due to the manufacturing tolerance, the second elastic sealing portion 142 can adapt to the gap between the third mating surface 113 and the fourth mating surface 133 through its own elastic deformation, thereby ensuring that the first pole body 11 or the first connecting piece 13 can be installed in place and there is reliable sealing between the two.

[0075] In a further embodiment, the first pole body 11 further has a fifth mating surface 114, and the cover body 12 is provided with a sixth mating surface 122. Along the thickness direction of the cover body 12, the fifth mating surface 114 and the sixth mating surface 122 correspond to each other, and the two are arranged at intervals. Specifically, the fifth mating surface 114 of the first pole body 11 can be a transition surface between the first column segment and the second column segment, and the sixth mating surface 122 of the cover body 12 can be an outer side surface of the cover body 12. The fifth mating surface 114 and the sixth mating surface 122 are in a face-to-face corresponding relationship, and the two are arranged at intervals.

[0076] In this embodiment, the first elastic sealing member 14 further includes a third elastic sealing portion 143 . The third elastic sealing portion 143 is filled between the fifth mating surface 114 and the sixth mating surface 122 , further playing a role of elastic sealing.

[0077] In addition, it should be noted that the material of the first elastic seal 14 may also have an insulating property, so as to avoid leakage caused by conductive contact between the first pole body 11 and the cover body 12 .

[0078] In a further embodiment, the cover plate assembly further includes a first sealing insulator 15 , which is disposed between the fifth mating surface 114 and the sixth mating surface 122 . The first sealing insulator 15 further includes an annular protrusion, which is disposed around the outer periphery of the first pole body 11 .

[0079] Specifically, the first sealing insulating member 15 may be made of resin material, which can play a sealing role on one hand, and can play an insulating and protective role for the first pole column 11 when it surrounds the outer circumference of the first pole column 11 on the other hand.

[0080] In some embodiments, the material of the first conductor layer 112 is copper, and the material of the second conductor layer 111 is aluminum. The first pole column 11 formed by the two serves as the negative pole of the battery. The material of the second conductor layer 111 is aluminum, which can be reliably welded with the aluminum bar sheet, and the first conductor layer 112 is copper, which can be reliably connected with the copper first connecting sheet 13. Copper has good electrical conductivity, redox properties and processing properties, and is more suitable as a negative pole column material and a negative connecting sheet material. Such a configuration can not only ensure reliable welding with the aluminum bar sheet, but also ensure good performance of the negative electrode.

[0081] In other embodiments, a second pole hole is provided on the cover body 12, and the cover assembly includes a second pole body 21 and a second connecting plate 22, the second pole body 21 cooperates with the second pole hole, and the second connecting plate 22 includes a pole connecting portion 134 connected to the second pole body 21 and a pole ear connecting portion 135 suitable for connecting to the pole ear of the battery cell.

[0082] In this embodiment, the second pole column 21 can be made of aluminum, and the second connecting piece 22 can also be made of aluminum. Since aluminum has stable chemical properties, good electrical conductivity, is easy to process, and has a good weight-to-strength ratio, it is more suitable as a positive pole column material than other metal materials. Therefore, the second pole column 21 can be the positive pole of the battery.

[0083] Similarly, the specific structure of the second connecting piece 22 can also refer to the structure of the first connecting piece 13, that is, the second connecting piece 22 and the first connecting piece 13 are both provided with a first indentation structure 136 and / or a second indentation structure 137. Among them, the first indentation structure 136 can be set to an arc shape and is arranged around the pole connecting portion 134. The second indentation structure 137 is set to a straight line, and the second indentation structure 137 is between the pole ear connecting portion 135 and the pole connecting portion 134.

[0084] In a further embodiment, the cover plate assembly further comprises a second elastic seal, which is used to cooperate with the second connecting piece 22 and the second pole column 21. Specifically, reference may be made to the cooperation structure of the first elastic seal 14 with the first connecting piece 13 and the first pole column 11.

[0085] That is, the cover body 12 is provided with a first mating surface 121, and the second connecting piece 22 has a second mating surface 132. Along the thickness direction of the cover body 12, the first mating surface 121 and the second mating surface 132 correspond to each other, and the two are arranged at intervals. The second pole body 21 has a third mating surface 113, and the second connecting piece 22 is provided with a fourth mating surface 133. Along the thickness direction of the cover body 12, the third mating surface 113 and the fourth mating surface 133 correspond to each other, and the two are arranged at intervals. The second pole body 21 also has a fifth mating surface 114, and the cover body 12 is provided with a sixth mating surface 122. Along the thickness direction of the cover body 12, the fifth mating surface 114 and the sixth mating surface 122 correspond to each other, and the two are arranged at intervals.

[0086] The second elastic sealing component includes a first elastic sealing portion 141, a second elastic sealing portion 142 and a third elastic sealing portion 143. The first elastic sealing portion 141 is filled between the first mating surface 121 of the cover body 12 and the second mating surface 132 of the second connecting piece 22, the second elastic sealing portion 142 is filled between the third mating surface 113 of the second pole body 21 and the fourth mating surface 133 of the second connecting piece 22, and the third elastic sealing portion 143 is filled between the fifth mating surface 114 of the second pole body 21 and the sixth mating surface 122 of the cover body 12.

[0087] With such arrangement, the second elastic seal can ensure the sealing between the second pole body 21 and the cover body 12 , and can also compensate for the manufacturing error between the second pole body 21 and the second connecting piece 22 , thereby ensuring the tight fit between the two.

[0088] Similarly, in this embodiment, the cover plate assembly may further include a second sealing insulating member, which has the same structure as the first sealing insulating member 15, that is, the second sealing insulating member is disposed between the fifth mating surface 114 of the second pole column 21 and the sixth mating surface 122 of the cover plate body 12, and the second sealing insulating member further includes an annular protrusion, which is disposed around the outer periphery of the second pole column 21. The second sealing insulating member may be made of a resin material, which can play a sealing role on the one hand, and can play an insulating and protective role on the second pole column 21 on the other hand by surrounding the outer periphery of the second pole column 21.

[0089] The present utility model also provides a battery, including the cover plate assembly as described in any one of the above items. With such a configuration, the battery provided by this embodiment can solve the problem of small battery capacity caused by large pole thickness. The derivation process of this beneficial effect is generally similar to the derivation process of the beneficial effect brought by the above cover plate assembly, and will not be repeated here.

[0090] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A cover plate assembly, characterized in that: include: The cover plate body (12) is provided with a first pole hole; The first pole body (11) is matched with the first pole hole, and the first pole body (11) includes a first conductor layer (112) and a second conductor layer (111), the top of the first conductor layer (112) is provided with a groove, the second conductor layer (111) is compounded in the groove, and the top surfaces of the first conductor layer (112) and the second conductor layer (111) are flush with each other; wherein the second conductor layer (111) is suitable for welding with a bar.

2. The cover plate assembly according to claim 1, characterized in that: Also includes: The first connecting piece (13) comprises a pole connecting portion (134) connected to the first pole body (11) and a pole tab connecting portion (135) suitable for connecting to a pole tab of a battery cell.

3. The cover plate assembly according to claim 2, characterized in that: The first connecting piece (13) is provided with a first indentation structure (136), the first indentation structure (136) is arranged in an arc shape and is arranged around the pole connecting portion (134); and / or A second indentation structure (137) is provided on the first connecting sheet (13); the second indentation structure (137) is arranged in a straight line; and the second indentation structure (137) is located between the pole lug connection portion (135) and the pole column connection portion (134).

4. The cover plate assembly according to claim 2, characterized in that: The pole connecting portion (134) is provided with a protruding structure (131), the protruding structure (131) is provided with a through hole, and the lower end of the first pole body (11) is sleeved in the through hole.

5. The cover plate assembly according to any one of claims 2 to 4, characterized in that: The cover plate body (12) is provided with a first mating surface (121), and the first connecting piece (13) has a second mating surface (132); along the thickness direction of the cover plate body (12), the first mating surface (121) and the second mating surface (132) correspond to each other and are arranged at an interval; The first pole body (11) has a third mating surface (113), the first connecting piece (13) is provided with a fourth mating surface (133), and along the thickness direction of the cover plate body (12), the third mating surface (113) and the fourth mating surface (133) correspond to each other and are arranged at an interval; Also includes: The first elastic sealing component (14) comprises a first elastic sealing portion (141) and a second elastic sealing portion (142), wherein the first elastic sealing portion (141) is filled between the first mating surface (121) and the second mating surface (132), and the second elastic sealing portion (142) is filled between the third mating surface (113) and the fourth mating surface (133).

6. The cover plate assembly according to claim 5, characterized in that: The first pole body (11) further has a fifth mating surface (114), and the cover body (12) is provided with a sixth mating surface (122); along the thickness direction of the cover body (12), the fifth mating surface (114) and the sixth mating surface (122) correspond to each other and are arranged at an interval; The first elastic sealing member (14) further comprises a third elastic sealing portion (143), wherein the third elastic sealing portion (143) is filled between the fifth mating surface (114) and the sixth mating surface (122).

7. The cover plate assembly according to claim 6, characterized in that: Also includes: The first sealing insulating member (15) is arranged between the fifth mating surface (114) and the sixth mating surface (122), and the first sealing insulating member (15) further comprises an annular protrusion, which is arranged around the outer periphery of the first pole body (11).

8. The cover plate assembly according to claim 1, characterized in that: The cover plate body (12) is provided with a second pole hole; The cover plate assembly further comprises a second pole column (21) and a second connecting piece (22), the second pole column (21) being matched with the second pole column hole, the second connecting piece (22) comprising a pole column connecting portion (134) connected to the second pole column (21) and a pole ear connecting portion (135) suitable for connecting to a pole ear of a battery cell; The second connecting sheet (22) is provided with a first indentation structure (136) and / or a second indentation structure (137); wherein: The first indentation structure (136) is arranged in an arc shape and is arranged around the pole connecting portion (134); The second indentation structure (137) is arranged in a straight line shape, and the second indentation structure (137) is located between the pole lug connection portion (135) and the pole connection portion (134).

9. The cover plate assembly according to claim 8, characterized in that: The cover plate body (12) is provided with a first mating surface (121), and the second connecting piece (22) has a second mating surface (132); along the thickness direction of the cover plate body (12), the first mating surface (121) and the second mating surface (132) correspond to each other and are arranged at an interval; The second pole body (21) has a third mating surface (113), and the second connecting piece (22) is provided with a fourth mating surface (133); along the thickness direction of the cover plate body (12), the third mating surface (113) and the fourth mating surface (133) correspond to each other and are arranged at an interval; The second pole body (21) further has a fifth mating surface (114), and the cover body (12) is provided with a sixth mating surface (122); along the thickness direction of the cover body (12), the fifth mating surface (114) and the sixth mating surface (122) correspond to each other and are arranged at an interval; Also includes: The second elastic sealing component comprises a first elastic sealing portion (141), a second elastic sealing portion (142) and a third elastic sealing portion (143), wherein the first elastic sealing portion (141) is filled between the first mating surface (121) and the second mating surface (132), the second elastic sealing portion (142) is filled between the third mating surface (113) and the fourth mating surface (133), and the third elastic sealing portion (143) is filled between the fifth mating surface (114) and the sixth mating surface (122).

10. A battery, characterized in that: It comprises the cover plate assembly as described in any one of claims 1 to 9.

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