Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery. The cover plate assembly comprises a plate body part and a pole, a mounting hole is formed in the center of the plate body part in a penetrating manner, and the post terminal is at least partially accommodated in the mounting hole and completely fills the mounting hole; wherein the mounting hole comprises an insertion section, a positioning section and a welding section which are sequentially distributed in the axial direction of the mounting hole, the diameter of the welding section is smaller than that of the insertion section, and the diameter of the positioning section is gradually reduced in the direction from the insertion section to the welding section. Based on the technical scheme of the utility model, on the basis of the design of the matching structure between the plate body part and the pole, the plate body part and the pole can ensure the consistency of the assembly size, the plate body part and the pole are further fixed on the basis of welding, and the whole structure and even the corresponding assembly process do not need to participate in high-pressure processes such as riveting, so that the production efficiency is improved. Assembling is completed without depending on deformation of the pole, and the influence of uncontrollable deformation on the structural reliability and sealing performance of the cover plate assembly can be eliminated.

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] At present, most of the assembly connections of battery cover plates are achieved by riveting, that is, the pole is connected to the cover plate by riveting and achieves sealing with the cover plate. However, based on the inherent properties of the riveting process itself, it is determined that the pole is prone to deformation inconsistency at various positions during riveting, so it is difficult to fully ensure the consistency of the size of the cover plate assembly parts and the consistency of the sealing performance. At the same time, since the pole riveting structure is directly matched with the insulating seal in the cover plate assembly, the riveting force acts directly on the insulating seal in the cover plate assembly, and the insulating seal is usually made of PFA material or PPS material, and is not a completely rigid structure. Therefore, it is difficult for it to stably withstand the riveting force, and the process control is difficult. Utility Model Content

[0003] In order to solve the problem that it is difficult to ensure the consistency of part size, sealing and product quality in the prior art riveting process for battery cover plate assemblies, the utility model proposes a cover plate assembly and a battery.

[0004] In a first aspect, the present invention provides a cover plate assembly, comprising:

[0005] A plate body having a mounting hole extending through the center thereof; and

[0006] a pole, which is at least partially received in the mounting hole and completely fills the mounting hole;

[0007] The mounting hole comprises an insertion section, a positioning section and a welding section which are sequentially distributed along its axis, the diameter of the welding section is smaller than that of the insertion section, and the diameter of the positioning section gradually decreases from the insertion section to the welding section.

[0008] In one embodiment, the end surface of one end of the pole is flush with the surface of the central area of ​​the plate body, and the central area is the area where the opening of the mounting hole corresponding to the welding section is located.

[0009] In one embodiment, the length of the welding section in the axial direction of the mounting hole is greater than a predetermined welding penetration.

[0010] In one embodiment, the plate body includes a cover plate body, an insulating positioning plate and an adapter plate stacked in sequence, and the center hole constructed in the center of the cover plate body and the insulating positioning plate together form the insertion section, and the center hole constructed in the center of the adapter plate forms the positioning section and the welding section.

[0011] In one embodiment, an explosion-proof valve sheet is fixed on the surface of the cover body close to the insulating positioning sheet, and an explosion-proof hole corresponding to the explosion-proof valve sheet is formed through the cover body, and a part of the explosion-proof valve sheet protrudes into the explosion-proof hole.

[0012] In one embodiment, the adapter plate is provided with a plurality of first through holes surrounding the central hole thereof, and a groove and a connecting groove for connecting the plurality of first through holes with the groove are provided on the surface of the adapter plate close to the insulating positioning piece;

[0013] The groove corresponds to the explosion-proof valve plate, and a second through hole communicating with the groove is formed through the position of the insulating positioning plate corresponding to the groove.

[0014] In one embodiment, a plurality of first positioning grooves and a plurality of second positioning grooves are respectively formed on the surface of the cover body and the adapter plate close to the insulating positioning piece, and positioning protrusions for cooperating with the corresponding positioning grooves are provided on the surfaces on the opposite sides of the insulating positioning piece.

[0015] In one embodiment, a sealing ring is provided in the mounting hole, the sealing ring corresponds to the insertion section, the inner diameter of the sealing ring is the diameter of the insertion section, and the poles pass through the sealing ring and are in close contact with each other.

[0016] In one embodiment, the diameters of the center holes constructed at the center of the cover body and the center of the adapter plate are both smaller than the center hole constructed at the center of the insulating positioning piece, so as to form an annular gap between the cover body and the adapter plate, and an annular groove surrounding the center hole is provided at a position on the surface of the cover body corresponding to the annular gap;

[0017] The sealing ring has a positioning portion that fits in the annular gap, and a surface of the positioning portion is configured with an annular protrusion that fits in the annular groove.

[0018] In a second aspect, the utility model provides a battery, which includes a battery body and the above-mentioned cover plate assembly, wherein the cover plate assembly is at least arranged at one end of the positive electrode of the battery body.

[0019] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the utility model can be achieved.

[0020] Compared with the prior art, the cover plate assembly and battery provided by the present invention have at least the following features:

[0021] Beneficial effects:

[0022] The utility model provides a cover plate assembly and a battery, based on the design of the matching structure between the plate body and the pole, so that the consistency of the assembly dimensions between the plate body and the pole can be ensured, and the two are further fixed based on welding. The entire structure and even the corresponding assembly process do not require the participation of high-pressure processes such as riveting, and do not rely on the deformation of the pole to complete the assembly, which can eliminate the influence of uncontrollable deformation on the structural reliability and sealing of the cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0024] Figure 1 A cross-sectional view showing the structure of the cover plate assembly of the present invention;

[0025] Figure 2 An exploded view showing the structure of the cover plate assembly of the utility model;

[0026] Figure 3 Shows Figure 1 A partial enlarged view of the middle A;

[0027] Figure 4 Shows Figure 3 A schematic diagram of the structure of the other side of the middle cover body;

[0028] Figure 5 A schematic diagram showing the positioning of the pole and the adapter plate of the cover plate assembly of the utility model;

[0029] Figure 6 A schematic diagram of a battery corresponding to the cover plate assembly of the utility model is shown.

[0030] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0031] Reference numerals:

[0032] 1-plate body, 11-cover body, 111-explosion-proof hole, 112-first positioning groove, 12-insulating positioning piece, 121-second through hole, 122-positioning protrusion, 13-adapter plate, 131-first through hole, 132-connecting groove, 133-groove, 14-annular gap;

[0033] 2-mounting hole, 21-insertion section, 22-positioning section, 23-welding section;

[0034] 3-pole, 31-positioning surface, 32-welding surface;

[0035] 4- Explosion-proof valve plate;

[0036] 5-seal ring, 51-positioning portion, 52-annular protrusion;

[0037] 6-Battery body. DETAILED DESCRIPTION

[0038] The utility model will be further described below in conjunction with the accompanying drawings.

[0039] Example 1

[0040] The embodiment of the utility model provides a cover plate assembly, including a plate body 1 and a pole 3; a mounting hole 2 is formed through the center of the plate body 1, and the pole 3 is at least partially accommodated in the mounting hole 2 and completely fills the mounting hole 2.

[0041] The mounting hole 2 includes an insertion section 21, a positioning section 22 and a welding section 23 which are sequentially distributed along its own axis. The diameter of the welding section 23 is smaller than that of the insertion section 21, and the diameter of the positioning section 22 gradually decreases along the direction from the insertion section 21 to the welding section 23.

[0042] Specifically, as shown in the attached figure Figure 1 As shown, the cover plate assembly mainly includes two parts: a plate body 1 and a pole 3 . A mounting hole 2 is provided at the center of the plate body 1 for mounting the pole 3 .

[0043] If a conventional riveting scheme is adopted, the pole 3 is riveted after being placed in the mounting hole 2. The riveting will cause the pole 3 to expand and deform in the radial direction, thereby fixing it in the mounting hole 2, and at the same time, it will press against the seal set in the mounting hole 2 to achieve sealing. Based on the problems raised in the background technology above, under the action of the pressure generated by riveting, the specific situation that the pole 3 produces radial expansion deformation and its base may be fractured and everted is actually uncontrollable. These uncontrollable situations include whether deformation occurs and the specific direction and degree of the deformation. In addition, due to the non-rigid and low-strength structure brought about by the commonly used materials of the seal mentioned in the background technology above, under the action of the riveting pressure, the squeeze condition of the seal by the pole 3 is also difficult to control, and it is very likely that the structure of the seal will be destroyed under the action of excessive squeezing. The superposition of the above multiple factors will easily lead to sealing problems between the pole 3 and the cover plate.

[0044] Therefore, the utility model proposes a new structure for the cover plate assembly, and adopts other processes to replace riveting based on the structural design, so as to avoid the corresponding problems. Figure 1As shown, the utility model first designs the structure of the mounting hole 2 of the plate body 1, and designs it into an insertion section 21, a positioning section 22 and a welding section 23 with varying diameters in the axial direction of the mounting hole 2. The insertion section 21 and the welding section 23 are both straight hole structures with equal diameters, and the diameter of the insertion section 21 is larger than that of the welding section 23; the positioning section 22 connects and transitions between the insertion section 21 and the welding section 23, and the positioning section 22 is constructed so that the diameter gradually decreases from the insertion section 21 to the welding section 23, so the positioning section 22 has a tapered hole structure as a whole. Secondly, based on the structural design of the positioning hole, the utility model designs the outer shape structure of the pole 3 to be consistent with the positioning hole, that is, the pole 3 is also divided into three sections with different outer diameters in its own axial direction, as shown in the accompanying drawings Figure 1 and Figure 2 Therefore, when the pole 3 is inserted into the mounting hole 2, it can completely fill the mounting hole 2.

[0045] During assembly, the pole 3 is inserted from the hole at one end where the insertion section 21 of the mounting hole 2 is located and moves toward the end where the welding section 23 is located. Since the radial dimensions of the mounting hole 2 and the pole 3 are gradually reduced in this direction, the pole 3 can be smoothly inserted into the mounting hole 2. However, due to the presence of the positioning section 22, when the corresponding positioning surface 31 on the pole 3 contacts the inner wall of the positioning section 22, the pole 3 is axially positioned with the mounting hole 2, indicating that the pole 3 is inserted into place. At this time, the welding surface 32 of the pole 3 corresponds to the inner wall of the welding section 23 of the mounting hole 2, so the design of the positioning section 22 and the positioning surface 31 can ensure the consistency of the pre-installation of the product; finally, the part where the welding surface 32 and the inner wall of the welding section 23 are in contact with each other is welded from one end of the pole 3, so that the pole 3 and the plate body 1 can be fixed as a whole, as shown in the accompanying drawing Figure 1 , Figure 3 and Figure 5 In addition, during the insertion process, the welding surface 32 and the positioning surface 31 of the pole 3 can actually play a guiding function to avoid interference between the end of the pole 3 and the mounting hole 2 or other structures during insertion.

[0046] The cover plate assembly of the utility model is based on the design of the matching structure between the plate body 1 and the pole 3, so that the plate body 1 and the pole 3 can ensure the consistency of the assembly dimensions, and the two are further fixed based on welding. The entire structure and even the corresponding assembly process do not require the participation of high-pressure processes such as riveting, and do not rely on the deformation of the pole 3 to complete the assembly, which can eliminate the influence of uncontrollable deformation on the structural reliability and sealing of the cover plate assembly.

[0047] Preferably, the end surface of one end of the pole 3 is flush with the surface of the central area of ​​the plate body 1 , and the central area is the area where the opening of the mounting hole 2 corresponding to the welding section 23 is located.

[0048] Specifically, as shown in the attached figure Figure 1 As shown, the bottom end surface of the pole 3 is flush with the surface of the central area of ​​the bottom surface of the plate body 1, which provides favorable conditions for the subsequent welding process and ensures the welding effect of the product.

[0049] Preferably, the length of the welding section 23 in the axial direction of the mounting hole 2 is greater than a predetermined welding penetration.

[0050] Specifically, the welding penetration is the depth of the weld. Depending on the welding process, parameters, and welding materials, the welding penetration also has different values, and after the corresponding welding parameters are determined, they will correspond to a predetermined welding penetration. In this embodiment, the specific value of the predetermined welding penetration is not limited, which depends on the actual welding process, parameters, materials, etc. The utility model only limits the axial length of the welding section 23 to be greater than the corresponding predetermined welding penetration. This is to avoid the weld from invading the positioning section 22 and ensure the reliability of the assembly structure of the pole 3 and the plate body 1 during the welding process.

[0051] Example 2

[0052] The embodiment of the utility model provides a cover plate assembly, including a plate body 1 and a pole 3; a mounting hole 2 is formed through the center of the plate body 1, and the pole 3 is at least partially accommodated in the mounting hole 2 and completely fills the mounting hole 2.

[0053] The mounting hole 2 includes an insertion section 21, a positioning section 22 and a welding section 23 which are sequentially distributed along its own axis. The diameter of the welding section 23 is smaller than that of the insertion section 21, and the diameter of the positioning section 22 gradually decreases along the direction from the insertion section 21 to the welding section 23.

[0054] Specifically, as shown in the attached figure Figure 1 As shown, the cover plate assembly mainly includes two parts: a plate body 1 and a pole 3 . A mounting hole 2 is provided at the center of the plate body 1 for mounting the pole 3 .

[0055] If a conventional riveting scheme is adopted, the pole 3 is riveted after being placed in the mounting hole 2. The riveting will cause the pole 3 to expand and deform in the radial direction, thereby fixing it in the mounting hole 2, and at the same time, it will press against the seal set in the mounting hole 2 to achieve sealing. Based on the problems raised in the background technology above, under the action of the pressure generated by riveting, the specific situation that the pole 3 produces radial expansion deformation and its base may be fractured and everted is actually uncontrollable. These uncontrollable situations include whether deformation occurs and the specific direction and degree of the deformation. In addition, due to the non-rigid and low-strength structure brought about by the commonly used materials of the seal mentioned in the background technology above, under the action of the riveting pressure, the squeeze condition of the seal by the pole 3 is also difficult to control, and it is very likely that the structure of the seal will be destroyed under the action of excessive squeezing. The superposition of the above multiple factors will easily lead to sealing problems between the pole 3 and the cover plate.

[0056] Therefore, the utility model proposes a new structure for the cover plate assembly, and adopts other processes to replace riveting based on the structural design, so as to avoid the corresponding problems. Figure 1 As shown, the utility model first designs the structure of the mounting hole 2 of the plate body 1, and designs it into an insertion section 21, a positioning section 22 and a welding section 23 with varying diameters in the axial direction of the mounting hole 2. The insertion section 21 and the welding section 23 are both straight hole structures with equal diameters, and the diameter of the insertion section 21 is larger than that of the welding section 23; the positioning section 22 connects and transitions between the insertion section 21 and the welding section 23, and the positioning section 22 is constructed so that the diameter gradually decreases from the insertion section 21 to the welding section 23, so the positioning section 22 has a tapered hole structure as a whole. Secondly, based on the structural design of the positioning hole, the utility model designs the outer shape structure of the pole 3 to be consistent with the positioning hole, that is, the pole 3 is also divided into three sections with different outer diameters in its own axial direction, as shown in the accompanying drawings Figure 1 and Figure 2 Therefore, when the pole 3 is inserted into the mounting hole 2, it can completely fill the mounting hole 2.

[0057] During assembly, the pole 3 is inserted from the hole at one end where the insertion section 21 of the mounting hole 2 is located and moves toward the end where the welding section 23 is located. Since the radial dimensions of the mounting hole 2 and the pole 3 are gradually reduced in this direction, the pole 3 can be smoothly inserted into the mounting hole 2. However, due to the presence of the positioning section 22, when the corresponding positioning surface 31 on the pole 3 contacts the inner wall of the positioning section 22, the pole 3 is axially positioned with the mounting hole 2, indicating that the pole 3 is inserted into place. At this time, the welding surface 32 of the pole 3 corresponds to the inner wall of the welding section 23 of the mounting hole 2, so the design of the positioning section 22 and the positioning surface 31 can ensure the consistency of the pre-installation of the product; finally, the part where the welding surface 32 and the inner wall of the welding section 23 are in contact with each other is welded from one end of the pole 3, so that the pole 3 and the plate body 1 can be fixed as a whole, as shown in the accompanying drawing Figure 1 , Figure 3 and Figure 5 In addition, during the insertion process, the welding surface 32 and the positioning surface 31 of the pole 3 can actually play a guiding function to avoid interference between the end of the pole 3 and the mounting hole 2 or other structures during insertion.

[0058] The cover plate assembly of the utility model is based on the design of the matching structure between the plate body 1 and the pole 3, so that the plate body 1 and the pole 3 can ensure the consistency of the assembly dimensions, and the two are further fixed based on welding. The entire structure and even the corresponding assembly process do not require the participation of high-pressure processes such as riveting, and do not rely on the deformation of the pole 3 to complete the assembly, which can eliminate the influence of uncontrollable deformation on the structural reliability and sealing of the cover plate assembly.

[0059] Preferably, the end surface of one end of the pole 3 is flush with the surface of the central area of ​​the plate body 1 , and the central area is the area where the opening of the mounting hole 2 corresponding to the welding section 23 is located.

[0060] Specifically, as shown in the attached figure Figure 1 As shown, the bottom end surface of the pole 3 is flush with the surface of the central area of ​​the bottom surface of the plate body 1, which provides favorable conditions for the subsequent welding process and ensures the welding effect of the product.

[0061] Preferably, the length of the welding section 23 in the axial direction of the mounting hole 2 is greater than a predetermined welding penetration.

[0062] Specifically, the welding penetration is the depth of the weld. Depending on the welding process, parameters, and welding materials, the welding penetration also has different values, and after the corresponding welding parameters are determined, they will correspond to a predetermined welding penetration. In this embodiment, the specific value of the predetermined welding penetration is not limited, which depends on the actual welding process, parameters, materials, etc. The utility model only limits the axial length of the welding section 23 to be greater than the corresponding predetermined welding penetration. This is to avoid the weld from invading the positioning section 22 and ensure the reliability of the assembly structure of the pole 3 and the plate body 1 during the welding process.

[0063] Furthermore, the plate body 1 includes a cover body 11, an insulating positioning piece 12 and an adapter plate 13 stacked in sequence. The center holes constructed in the center of the cover body 11 and the insulating positioning piece 12 together form an insertion section 21, and the center hole constructed in the center of the adapter plate 13 forms a positioning section 22 and a welding section 23.

[0064] Specifically, as shown in the attached figure Figure 1 and Figure 2 As shown, the plate body 1 is formed by overlapping the cover body 11, the insulating positioning piece 12 and the adapter plate 13 in sequence, wherein the welding between the plate body 1 and the pole 3 is mainly carried out at the bottom end surface, and in order to ensure the consistency of the assembly size and subsequent welding operations, the positioning section 22 and the welding section 23 are both composed of a center hole constructed in the center of the adapter plate 13, and the center holes of the remaining cover body 11 and the insulating positioning piece 12 constitute the insertion section 21.

[0065] Furthermore, an explosion-proof valve plate 4 is fixed on the surface of the cover body 11 close to the insulating positioning plate 12 , and an explosion-proof hole 111 corresponding to the explosion-proof valve plate 4 is formed through the cover body 11 , and a part of the explosion-proof valve plate 4 protrudes into the explosion-proof hole 111 .

[0066] Specifically, as shown in the attached figure Figure 1 and Figure 2 As shown, the explosion-proof valve plate 4 is arranged inside the plate body 1, specifically fixed on the bottom surface of the cover plate body 11, located between the cover plate body 11 and the insulating positioning plate 12 and corresponding to the explosion-proof hole 111 on the cover plate body 11. The explosion-proof valve plate 4 is in the shape of a disc as a whole, with a diameter larger than the explosion-proof hole 111, and is specifically embedded in the surface of the cover plate body 11 at a position corresponding to the explosion-proof hole 111. The center of the explosion-proof valve plate 4 has a boss protruding into the explosion-proof hole 111, and the center of the boss has a concave structure concave toward the outside of the explosion-proof hole 111, so that the cross section of the explosion-proof valve plate 4 is a type of wavy structure, as shown in the accompanying drawings Figure 1 As shown, such a structure facilitates the gas to deform, and the explosion-proof hole 111 also provides a space for the gas to deform.

[0067] The explosion-proof principle of the explosion-proof valve plate 4 is that during the operation of the battery, gas may be accidentally generated, causing excessive internal pressure in the battery, which may lead to the risk of explosion. When the internal pressure of the battery increases to a critical point, the pressure acts on the explosion-proof valve plate 4 to deform it. The deformed explosion-proof valve plate 4 can reduce or even release the pressure, that is, explosion-proof.

[0068] Furthermore, the adapter plate 13 is provided with a plurality of first through holes 131 surrounding its center hole, and a groove 133 and a connecting groove 132 connecting the plurality of first through holes 131 with the groove 133 are provided on the surface of the adapter plate 13 on the side close to the insulating positioning plate 12; wherein the groove 133 corresponds to the explosion-proof valve plate 4, and a second through hole 121 connecting with the groove 133 is provided at a position of the insulating positioning plate 12 corresponding to the groove 133.

[0069] Specifically, as shown in the attached figure Figure 1 , Figure 2 and Figure 5 As shown, the adapter plate 13 is the closest to the battery when the cover plate assembly and the battery are assembled. If gas is generated inside the battery and the gas wants to reach the explosion-proof valve plate 4, it must obviously pass through the adapter plate 13. Therefore, a plurality of first through holes 131 are firstly provided on the adapter plate 13, and the gas in the battery can pass through the adapter plate 13 from bottom to top, and then further pass through the connection groove 132 on the surface of the adapter plate 13 and merge into the groove 133 corresponding to the explosion-proof valve plate 4, and finally reach the explosion-proof valve plate 4 through the second through hole 121 corresponding to the groove 133 and the explosion-proof valve plate 4. Therefore, the further design of the structure of the adapter plate 13 and the insulating positioning plate 12 can cooperate with the explosion-proof valve plate 4 to effectively realize the explosion-proof function.

[0070] In addition, the multiple first through holes 131 and the multiple connecting grooves 132 on the adapter plate 13 and the second through holes 121 of the insulating positioning plate 12 actually form an internal space inside the plate body 1. The internal space not only allows the gas generated inside the battery to flow to the explosion-proof valve plate 4, but also provides a certain space to accommodate the gas, which can help reduce the internal pressure of the battery.

[0071] Furthermore, a plurality of first positioning grooves 112 and second positioning grooves are respectively formed on the surface of the cover body 11 and the adapter plate 13 close to the insulating positioning piece 12 , and positioning protrusions 122 for cooperating with the corresponding positioning grooves are provided on the surfaces of the opposite sides of the insulating positioning piece 12 .

[0072] Specifically, as shown in the attached figure Figure 1 , Figure 2 and Figure 4As shown, the positioning of the cover body 11, the insulating positioning piece 12 and the adapter plate 13 in the circumferential and radial directions is achieved by the positioning protrusion 122 and the corresponding first positioning groove 112 and the second positioning groove. In order to save space and improve the compactness of the structure, the function of the second positioning groove is replaced by the groove 133 on the adapter plate 13; accordingly, the second through hole 121 on the insulating positioning piece 12 is directly opened at the positioning protrusion 122 and passes through the positioning protrusion 122. Based on this structure, in order to affect the circulation of gas, the protruding height of the positioning protrusion 122 is less than the depth of the groove 133.

[0073] Example 3

[0074] The embodiment of the utility model provides a cover plate assembly, including a plate body 1 and a pole 3; a mounting hole 2 is formed through the center of the plate body 1, and the pole 3 is at least partially accommodated in the mounting hole 2 and completely fills the mounting hole 2.

[0075] The mounting hole 2 includes an insertion section 21, a positioning section 22 and a welding section 23 which are sequentially distributed along its own axis. The diameter of the welding section 23 is smaller than that of the insertion section 21, and the diameter of the positioning section 22 gradually decreases along the direction from the insertion section 21 to the welding section 23.

[0076] Specifically, as shown in the attached figure Figure 1 As shown, the cover plate assembly mainly includes two parts: a plate body 1 and a pole 3 . A mounting hole 2 is provided at the center of the plate body 1 for mounting the pole 3 .

[0077] If a conventional riveting scheme is adopted, the pole 3 is riveted after being placed in the mounting hole 2. The riveting will cause the pole 3 to expand and deform in the radial direction, thereby fixing it in the mounting hole 2, and at the same time, it will press against the seal set in the mounting hole 2 to achieve sealing. Based on the problems raised in the background technology above, under the action of the pressure generated by riveting, the specific situation that the pole 3 produces radial expansion deformation and its base may be fractured and everted is actually uncontrollable. These uncontrollable situations include whether deformation occurs and the specific direction and degree of the deformation. In addition, due to the non-rigid and low-strength structure brought about by the commonly used materials of the seal mentioned in the background technology above, under the action of the riveting pressure, the squeeze condition of the seal by the pole 3 is also difficult to control, and it is very likely that the structure of the seal will be destroyed under the action of excessive squeezing. The superposition of the above multiple factors will easily lead to sealing problems between the pole 3 and the cover plate.

[0078] Therefore, the utility model proposes a new structure for the cover plate assembly, and adopts other processes to replace riveting based on the structural design, so as to avoid the corresponding problems. Figure 1As shown, the utility model first designs the structure of the mounting hole 2 of the plate body 1, and designs it into an insertion section 21, a positioning section 22 and a welding section 23 with varying diameters in the axial direction of the mounting hole 2. The insertion section 21 and the welding section 23 are both straight hole structures with equal diameters, and the diameter of the insertion section 21 is larger than that of the welding section 23; the positioning section 22 connects and transitions between the insertion section 21 and the welding section 23, and the positioning section 22 is constructed so that the diameter gradually decreases from the insertion section 21 to the welding section 23, so the positioning section 22 has a tapered hole structure as a whole. Secondly, based on the structural design of the positioning hole, the utility model designs the outer shape structure of the pole 3 to be consistent with the positioning hole, that is, the pole 3 is also divided into three sections with different outer diameters in its own axial direction, as shown in the accompanying drawings Figure 1 and Figure 2 Therefore, when the pole 3 is inserted into the mounting hole 2, it can completely fill the mounting hole 2.

[0079] During assembly, the pole 3 is inserted from the hole at one end where the insertion section 21 of the mounting hole 2 is located and moves toward the end where the welding section 23 is located. Since the radial dimensions of the mounting hole 2 and the pole 3 are gradually reduced in this direction, the pole 3 can be smoothly inserted into the mounting hole 2. However, due to the presence of the positioning section 22, when the corresponding positioning surface 31 on the pole 3 contacts the inner wall of the positioning section 22, the pole 3 is axially positioned with the mounting hole 2, indicating that the pole 3 is inserted into place. At this time, the welding surface 32 of the pole 3 corresponds to the inner wall of the welding section 23 of the mounting hole 2, so the design of the positioning section 22 and the positioning surface 31 can ensure the consistency of the pre-installation of the product; finally, the part where the welding surface 32 and the inner wall of the welding section 23 are in contact with each other is welded from one end of the pole 3, so that the pole 3 and the plate body 1 can be fixed as a whole, as shown in the accompanying drawing Figure 1 , Figure 3 and Figure 5 In addition, during the insertion process, the welding surface 32 and the positioning surface 31 of the pole 3 can actually play a guiding function to avoid interference between the end of the pole 3 and the mounting hole 2 or other structures during insertion.

[0080] The cover plate assembly of the utility model is based on the design of the matching structure between the plate body 1 and the pole 3, so that the plate body 1 and the pole 3 can ensure the consistency of the assembly dimensions, and the two are further fixed based on welding. The entire structure and even the corresponding assembly process do not require the participation of high-pressure processes such as riveting, and do not rely on the deformation of the pole 3 to complete the assembly, which can eliminate the influence of uncontrollable deformation on the structural reliability and sealing of the cover plate assembly.

[0081] Preferably, the end surface of one end of the pole 3 is flush with the surface of the central area of ​​the plate body 1 , and the central area is the area where the opening of the mounting hole 2 corresponding to the welding section 23 is located.

[0082] Specifically, as shown in the attached figure Figure 1 As shown, the bottom end surface of the pole 3 is flush with the surface of the central area of ​​the bottom surface of the plate body 1, which provides favorable conditions for the subsequent welding process and ensures the welding effect of the product.

[0083] Preferably, the length of the welding section 23 in the axial direction of the mounting hole 2 is greater than a predetermined welding penetration.

[0084] Specifically, the welding penetration is the depth of the weld. Depending on the welding process, parameters, and welding materials, the welding penetration also has different values, and after the corresponding welding parameters are determined, they will correspond to a predetermined welding penetration. In this embodiment, the specific value of the predetermined welding penetration is not limited, which depends on the actual welding process, parameters, materials, etc. The utility model only limits the axial length of the welding section 23 to be greater than the corresponding predetermined welding penetration. This is to avoid the weld from invading the positioning section 22 and ensure the reliability of the assembly structure of the pole 3 and the plate body 1 during the welding process.

[0085] Furthermore, the plate body 1 includes a cover body 11, an insulating positioning piece 12 and an adapter plate 13 stacked in sequence. The center holes constructed in the center of the cover body 11 and the insulating positioning piece 12 together form an insertion section 21, and the center hole constructed in the center of the adapter plate 13 forms a positioning section 22 and a welding section 23.

[0086] Specifically, as shown in the attached figure Figure 1 and Figure 2 As shown, the plate body 1 is formed by overlapping the cover body 11, the insulating positioning piece 12 and the adapter plate 13 in sequence, wherein the welding between the plate body 1 and the pole 3 is mainly carried out at the bottom end surface, and in order to ensure the consistency of the assembly size and subsequent welding operations, the positioning section 22 and the welding section 23 are both composed of a center hole constructed in the center of the adapter plate 13, and the center holes of the remaining cover body 11 and the insulating positioning piece 12 constitute the insertion section 21.

[0087] Furthermore, an explosion-proof valve plate 4 is fixed on the surface of the cover body 11 close to the insulating positioning plate 12 , and an explosion-proof hole 111 corresponding to the explosion-proof valve plate 4 is formed through the cover body 11 , and a part of the explosion-proof valve plate 4 protrudes into the explosion-proof hole 111 .

[0088] Specifically, as shown in the attached figure Figure 1 and Figure 2As shown, the explosion-proof valve plate 4 is arranged inside the plate body 1, specifically fixed on the bottom surface of the cover plate body 11, located between the cover plate body 11 and the insulating positioning plate 12 and corresponding to the explosion-proof hole 111 on the cover plate body 11. The explosion-proof valve plate 4 is in the shape of a disc as a whole, with a diameter larger than the explosion-proof hole 111, and is specifically embedded in the surface of the cover plate body 11 at a position corresponding to the explosion-proof hole 111. The center of the explosion-proof valve plate 4 has a boss protruding into the explosion-proof hole 111, and the center of the boss has a concave structure concave toward the outside of the explosion-proof hole 111, so that the cross section of the explosion-proof valve plate 4 is a type of wavy structure, as shown in the accompanying drawings Figure 1 As shown, such a structure facilitates the gas to deform, and the explosion-proof hole 111 also provides a space for the gas to deform.

[0089] The explosion-proof principle of the explosion-proof valve plate 4 is that during the operation of the battery, gas may be accidentally generated, causing excessive internal pressure in the battery, which may lead to the risk of explosion. When the internal pressure of the battery increases to a critical point, the pressure acts on the explosion-proof valve plate 4 to deform it. The deformed explosion-proof valve plate 4 can reduce or even release the pressure, that is, explosion-proof.

[0090] Furthermore, the adapter plate 13 is provided with a plurality of first through holes 131 surrounding its center hole, and a groove 133 and a connecting groove 132 connecting the plurality of first through holes 131 with the groove 133 are provided on the surface of the adapter plate 13 on the side close to the insulating positioning plate 12; wherein the groove 133 corresponds to the explosion-proof valve plate 4, and a second through hole 121 connecting with the groove 133 is provided at a position of the insulating positioning plate 12 corresponding to the groove 133.

[0091] Specifically, as shown in the attached figure Figure 1 , Figure 2 and Figure 5 As shown, the adapter plate 13 is the closest to the battery when the cover plate assembly and the battery are assembled. If gas is generated inside the battery and the gas wants to reach the explosion-proof valve plate 4, it must obviously pass through the adapter plate 13. Therefore, a plurality of first through holes 131 are firstly provided on the adapter plate 13, and the gas in the battery can pass through the adapter plate 13 from bottom to top, and then further pass through the connection groove 132 on the surface of the adapter plate 13 and merge into the groove 133 corresponding to the explosion-proof valve plate 4, and finally reach the explosion-proof valve plate 4 through the second through hole 121 corresponding to the groove 133 and the explosion-proof valve plate 4. Therefore, the further design of the structure of the adapter plate 13 and the insulating positioning plate 12 can cooperate with the explosion-proof valve plate 4 to effectively realize the explosion-proof function.

[0092] In addition, the multiple first through holes 131 and the multiple connecting grooves 132 on the adapter plate 13 and the second through holes 121 of the insulating positioning plate 12 actually form an internal space inside the plate body 1. The internal space not only allows the gas generated inside the battery to flow to the explosion-proof valve plate 4, but also provides a certain space to accommodate the gas, which can help reduce the internal pressure of the battery.

[0093] Furthermore, a plurality of first positioning grooves 112 and second positioning grooves are respectively formed on the surface of the cover body 11 and the adapter plate 13 close to the insulating positioning piece 12 , and positioning protrusions 122 for cooperating with the corresponding positioning grooves are provided on the surfaces of the opposite sides of the insulating positioning piece 12 .

[0094] Specifically, as shown in the attached figure Figure 1 , Figure 2 and Figure 4 As shown, the positioning of the cover body 11, the insulating positioning piece 12 and the adapter plate 13 in the circumferential and radial directions is achieved by the positioning protrusion 122 and the corresponding first positioning groove 112 and the second positioning groove. In order to save space and improve the compactness of the structure, the function of the second positioning groove is replaced by the groove 133 on the adapter plate 13; accordingly, the second through hole 121 on the insulating positioning piece 12 is directly opened at the positioning protrusion 122 and passes through the positioning protrusion 122. Based on this structure, in order to affect the circulation of gas, the protruding height of the positioning protrusion 122 is less than the depth of the groove 133.

[0095] Furthermore, a sealing ring 5 is provided in the mounting hole 2 , the sealing ring 5 corresponds to the insertion section 21 , the inner diameter of the sealing ring 5 is the diameter of the insertion section 21 , and the poles 3 pass through the sealing ring 5 and are in close contact with each other.

[0096] Specifically, as shown in the attached figure Figure 1 As shown, the sealing ring 5 is nested in the insertion section 21 of the mounting hole 2, and the inner hole of the sealing ring 5 is equivalent to directly constituting the insertion section 21 in structure. Preferably, the diameter of the inner hole of the sealing ring 5 is smaller than the outer diameter of the corresponding part of the pole 3 and larger than the outer diameter of the welding surface 32 of the pole 3. Optionally, the diameter of the matching part of the pole 3 and the sealing ring 5 is 0.01-0.02 mm larger than the inner diameter of the sealing ring 5 (in the natural state); in this way, when the pole 3 is inserted into the sealing ring 5, the front end where the welding surface 32 is located will not be scratched with the sealing ring 5, avoiding affecting the surface quality of the sealing ring 5. The inclined surface structure at the welding surface 32 of the pole 3 can guide the relative movement between the pole 3 and the sealing ring 5 when the pole 3 is inserted, so that the main body of the pole 3 squeezes the sealing ring 5 with a slightly smaller inner diameter, so that the sealing ring 5 can finally be tightly sleeved on the corresponding part of the pole 3.

[0097] Furthermore, the diameters of the center holes constructed at the center of the cover body 11 and the center of the adapter plate 13 are smaller than the center hole constructed at the center of the insulating positioning plate 12, so as to form an annular gap 14 between the cover body 11 and the adapter plate 13, and an annular groove surrounding the center hole is opened at a position on the surface of the cover body 11 corresponding to the annular gap 14; wherein the sealing ring 5 has a positioning portion 51 that fits in the annular gap, and the surface of the positioning portion 51 is constructed with an annular protrusion 52 that fits in the annular groove.

[0098] Specifically, as shown in the attached figure Figure 1 As shown, based on the size design of the center hole of the cover body 11, the adapter plate 13 and the insulating positioning piece 12, the diameter of the center hole of the insulating positioning piece 12 is set larger, so that an annular gap can be formed between the cover body 11 and the adapter plate 13 near the center hole, and the positioning portion 51 of the sealing ring 5 is matched in the annular gap, so that the sealing ring 5 can be axially positioned; and the positioning portion 51 of the sealing ring 5 further has an annular protrusion 52, and the annular protrusion 52 is inserted into the annular groove on the surface of the cover body 11 corresponding to the annular gap, so that the sealing ring 5 is radially positioned, and the consistency of the matching size between the sealing ring 5 and the plate body 1 is easily ensured, and the reliability of the combination of the sealing ring 5 and the plate body 1 is improved, so as to avoid the force generated on the sealing ring 3 when the pole 3 is installed to affect the stability of the structure. In the actual assembly process, the plate body 1 is assembled first, and the sealing ring 5 is molded in the assembly hole of the plate body 1 by injection molding.

[0099] In addition, as shown in the attached figure Figure 1 As shown, the sealing ring 5 has a radially extending positioning portion 51 at the bottom and a radially extending abutting portion at the top. The abutting portion, the positioning portion 51 and the main body of the sealing ring 5 form an I-shaped structure as a whole. After the pole 3 is assembled to the mounting hole 2, the head with a larger diameter at the top is buckled on the abutting portion, which can further enhance the sealing performance and exert a certain pressure on the sealing ring 5, so that the main body of the sealing ring 5 tends to deform toward its inner hole, thereby enhancing the sealing contact between the inner wall of the sealing ring 5 and the outer wall of the pole 3, which can also ensure the reliability of the sealing.

[0100] Example 4

[0101] The embodiment of the utility model provides a battery, as shown in the accompanying drawings Figure 6 As shown, it includes a battery body 6 and a cover assembly of any of the above embodiments. The cover assembly is at least arranged at the positive electrode end of the battery body 6. The negative electrode end can also adopt the cover assembly of the utility model, or adopt other structures.

[0102] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0103] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments, and other arrangements may be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the features described in the various dependent claims and herein may be combined in a manner different from that described in the original claims. It may also be understood that the features described in conjunction with the individual embodiments may be used in other described embodiments.

Claims

1. A cover plate assembly, characterized in that: include: A plate body having a mounting hole extending through the center thereof; and a pole, which is at least partially received in the mounting hole and completely fills the mounting hole; The mounting hole comprises an insertion section, a positioning section and a welding section which are sequentially distributed along its axis, the diameter of the welding section is smaller than that of the insertion section, and the diameter of the positioning section gradually decreases from the insertion section to the welding section.

2. The cover plate assembly according to claim 1, characterized in that: The end surface of one end of the pole is flush with the surface of the central area of ​​the plate body, and the central area is the area where the opening of the mounting hole corresponding to the welding section is located.

3. The cover plate assembly according to claim 1 or 2, characterized in that: The length of the welding section in the axial direction of the mounting hole is greater than a predetermined welding penetration.

4. The cover plate assembly according to claim 1, characterized in that: The plate body includes a cover body, an insulating positioning piece and an adapter plate stacked in sequence. The center holes constructed in the center of the cover body and the insulating positioning piece together form the insertion section, and the center hole constructed in the center of the adapter plate forms the positioning section and the welding section.

5. The cover plate assembly according to claim 4, characterized in that: An explosion-proof valve sheet is fixed on the surface of the cover body close to the insulating positioning sheet. An explosion-proof hole corresponding to the explosion-proof valve sheet is formed through the cover body. A part of the explosion-proof valve sheet protrudes into the explosion-proof hole.

6. The cover plate assembly according to claim 5, characterized in that: The adapter plate is provided with a plurality of first through holes surrounding the central hole thereof, and a groove and a connecting groove for connecting the plurality of first through holes with the groove are provided on the surface of the adapter plate close to the insulating positioning piece; The groove corresponds to the explosion-proof valve plate, and a second through hole communicating with the groove is formed through the position of the insulating positioning plate corresponding to the groove.

7. The cover plate assembly according to claim 4, characterized in that: A plurality of first positioning grooves and a plurality of second positioning grooves are respectively provided on the surfaces of the cover body and the adapter plate close to the insulating positioning piece, and positioning protrusions for cooperating with the corresponding positioning grooves are provided on the surfaces of the opposite sides of the insulating positioning piece.

8. The cover plate assembly according to claim 4, characterized in that: A sealing ring is arranged in the mounting hole, the sealing ring corresponds to the insertion section, the inner diameter of the sealing ring is the diameter of the insertion section, and the poles pass through the sealing ring and are in close contact with each other.

9. The cover plate assembly according to claim 8, characterized in that: The diameters of the center holes constructed at the center of the cover body and the center of the adapter plate are both smaller than the center hole constructed at the center of the insulating positioning piece, so as to form an annular gap between the cover body and the adapter plate, and an annular groove surrounding the center hole is provided at a position on the surface of the cover body corresponding to the annular gap; The sealing ring has a positioning portion that fits in the annular gap, and a surface of the positioning portion is configured with an annular protrusion that fits in the annular groove.

10. A battery, characterized in that: It comprises a battery body and a cover plate assembly as claimed in any one of claims 1 to 9, wherein the cover plate assembly is at least arranged at one end of the positive electrode of the battery body.

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