Lithium battery pole post module and lithium battery top cover

Abstract

This application provides a lithium battery terminal module and a lithium battery top cover, belonging to the technical field of power batteries. Specifically, the lithium battery terminal module includes a terminal and a retaining ring. The retaining ring surrounds the outer circumference of the terminal, and an annular support edge is fixed inside the retaining ring. The annular support edge abuts against the edge of the terminal's end face. Both the terminal and the annular support edge have through holes that penetrate both. This application's solution reduces the volume and weight of the terminal and changes the way the lithium battery terminal module is installed on the top cover, thereby reducing the overall weight of the lithium battery top cover.

Description

Technical Field

[0001] This application relates to the field of power batteries, and in particular to a lithium battery terminal module and a lithium battery top cover. Background Technology

[0002] Driven by the market, the demand for lithium-ion power batteries is increasing, and higher requirements are being placed on the energy density of lithium-ion power batteries.

[0003] Existing lithium batteries mainly consist of a casing, a top cover, and a cell. The top cover of a lithium battery has terminals that connect the internal circuit and the external circuit. Ordinary terminals are relatively large in size and weight, resulting in a heavy top cover for lithium batteries. Summary of the Invention

[0004] In view of this, this application provides a lithium battery terminal module and a lithium battery top cover, which solves the problem of heavy lithium battery top covers in the prior art and better meets the energy density requirements of lithium-ion power batteries.

[0005] On the one hand, the lithium battery terminal module provided in this application adopts the following technical solution:

[0006] A lithium battery terminal module includes a terminal and a wrapping ring. The wrapping ring surrounds the outer periphery of the terminal, and an annular support edge is fixed inside the wrapping ring. The annular support edge abuts against the edge of the end face of the terminal. The terminal and the annular support edge are provided with through holes that pass through both the terminal and the annular support edge.

[0007] Optionally, the pole includes a column and a lug, the lug being fixed to the circumferential side of the column, the annular support edge including a support ring abutting against the edge of the column and a support piece corresponding to the lug, and the perforation penetrating the lug and the support piece.

[0008] Optionally, a sealing ring is also included, wherein the outer side of the sealing ring is fitted with the inner side of the annular support edge.

[0009] On the other hand, the lithium battery top cover provided in this application adopts the following technical solution:

[0010] A lithium battery top cover includes a cover plate, a lower plastic plate, a positive terminal module, and a negative terminal module. The cover plate is fixed to the lower plastic plate, and the positive terminal module and the negative terminal module are fixed to the cover plate at intervals. Both the positive terminal module and the negative terminal module are lithium battery terminal modules as described above.

[0011] Optionally, it also includes rivets, the through hole for the rivets to pass through, the cover plate having a first through hole for the rivets to pass through, and the pole module, the cover plate and the lower plastic plate being fixedly connected by the rivets.

[0012] Optionally, the lower plastic plate and the cover plate are provided with through holes facing the positive terminal module and the negative terminal module respectively. The through holes allow the positive terminal module and the negative terminal module to communicate with the inside and outside of the lithium battery. A positioning ring is provided on the edge of the through hole of the lower plastic plate. The positive terminal module and the negative terminal module are both lithium battery terminal modules as described above. The positioning ring passes through the through hole of the cover plate and fits against the inner wall of the sealing ring.

[0013] Optionally, the cover plate has an annular protrusion on the edge of the through hole, and the sealing ring has a groove on its end face to accommodate the annular protrusion.

[0014] Optionally, the lower plastic plate is provided with a second through hole for the rivet to pass through. The rivet shank passes through the second through hole and the first through hole in sequence, and then passes through the through hole on the annular support edge and the pole in sequence. The lower plastic plate and the pole are provided with countersunk holes on their opposite ends. The two countersunk holes are respectively used to accommodate the rivet head and the deformed end of the rivet shank.

[0015] Optionally, the rivet head is fixed to the lower plastic plate, the rivet shank passes through the cover plate, the annular support edge and the pole post, and the pole post is provided with a countersunk hole for accommodating the deformed end of the rivet shank.

[0016] Optionally, a sealing sleeve is provided around the rivet. The sealing sleeve includes a limiting ring and a collar that passes through the first through hole. The first through hole has an annular groove on the edge of the end of the cover plate facing the lower plastic plate to accommodate the limiting ring. The limiting ring is clamped between the rivet head and the bottom of the annular groove. The collar passes through the first through hole and abuts against the annular support edge.

[0017] In summary, this application includes the following beneficial technical effects:

[0018] 1. Modularizing the terminal blocks and adding perforations allows the terminal block modules to be fixed to the top cover of the lithium battery via a riveting structure. This simplifies the installation process, reduces the volume and weight required for terminal block installation, and consequently reduces the weight of the lithium battery top cover. Furthermore, modular terminal blocks improve the efficiency of terminal block replacement and save on the cost of manufacturing molds.

[0019] 2. The terminal block module uses a double-rivet structure for installation. By designing the same rivet installation positions, any terminal block can be changed. When changing the top cover, only the different terminal blocks need to be replaced, eliminating the need to create multiple different molds and saving mold costs. Combined with modular terminal block manufacturing, this allows for faster and more convenient product replacement. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the lithium battery terminal module of this application;

[0022] Figure 2 This is an exploded view of the lithium battery terminal module of this application;

[0023] Figure 3 This is a schematic diagram of the overall structure of the lithium battery top cover of this application;

[0024] Figure 4 This is a schematic diagram of the exploded structure of the lithium battery top cover according to Embodiment 1 of this application;

[0025] Figure 5 This is a cross-sectional schematic diagram of the lithium battery top cover according to Embodiment 1 of this application;

[0026] Figure 6 This is a schematic diagram of the connection structure between the lithium battery rivet and the lower plastic plate, cover plate, and electrode module in Embodiment 1 of this application.

[0027] Figure 7 This is a schematic diagram of the structure of the rivets and sealing sleeves in this application;

[0028] Figure 8 for Figure 4 Enlarged diagram of part A in the middle;

[0029] Figure 9 This is a schematic diagram of the exploded structure of the lithium battery top cover according to Embodiment 2 of this application;

[0030] Figure 10 This is a schematic diagram of the connection structure between the rivet and the lower plastic plate in Embodiment 2 of this application.

[0031] Explanation of reference numerals in the attached diagram: 1. Terminal post; 11. Post body; 12. Lug; 13. Positive terminal post module; 14. Negative terminal post module; 2. Enclosing ring; 3. Annular support edge; 31. Support ring; 32. Support piece; 4. Perforation; 5. Sealing ring; 51. Groove; 6. Cover plate; 61. First through hole; 611. Annular groove; 62. Through hole; 63. Annular protrusion; 7. Lower plastic plate; 71. Second through hole; 72. Positioning ring; 8. Rivet; 81. Countersunk hole; 9. Sealing sleeve; 91. Collar; 92. Limiting ring; 93. Groove. Detailed Implementation

[0032] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0033] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0035] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0036] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that the described aspects can be practiced without these specific details.

[0037] Example 1

[0038] This application provides a lithium battery terminal module.

[0039] like Figure 1 and Figure 2 As shown, a lithium battery terminal module includes a terminal 1, a wrapping ring 2, and a sealing ring 5.

[0040] The pole post 1 includes a column 11 and lugs 12. The lugs 12 are fixed to the circumferential side of the column 11. In this embodiment, the column 11 is cylindrical, and two lugs 12 are provided. The lugs 12 are evenly distributed along the circumference of the column 11, and the lugs 12 and the column 11 are integrally formed. In other embodiments, the number of lugs 12 may be one or other numbers, and the cross-section of the column 11 may be rectangular or other polygonal.

[0041] A wrapping ring 2 surrounds the outer periphery of the pole post 1. An annular support edge 3 is fixed inside the wrapping ring 2, abutting against the edge of the end face of the pole post 1. The annular support edge 3 includes a support ring 31 that abuts against the edge of the pole post 11 and a support piece 32 corresponding to the lug 12. The support ring 31 and the support piece 32 are integrally formed. In this embodiment, the wrapping ring 2 is a circular ring, the support ring 31 is a circular ring, and the wrapping ring 2 and the annular support edge 3 are integrally formed of plastic. In other embodiments, the wrapping ring 2 can also be a rectangular or polygonal ring, and the inner ring of the support ring 31 can be rectangular or polygonal, as long as it can provide support and abut against the edge of the end face of the pole post 11.

[0042] The pole post 1 and the annular support edge 3 are provided with through holes 4 that pass through both pole post 1 and annular support edge 3. The through holes 4 pass through lug 12 and support plate 32, and the through holes 4 on lug 12 and support plate 32 are aligned with each other.

[0043] The outer side of the sealing ring 5 is fitted against the inner side of the annular support edge 3. In this embodiment, the sealing ring 5 is fitted against the inner ring of the support ring 31. The sealing ring 5 is made of fluororubber; in other embodiments, it can be made of other rubbers.

[0044] Modularizing the lithium battery terminals and adding perforations 4 allows the lithium battery terminal modules to be fixed to the top cover of the lithium battery via rivets 8, simplifying the installation of terminals 1, reducing the volume and weight required for installation, and thus reducing the weight of the lithium battery top cover. Furthermore, the modular terminals 1 improve the efficiency of terminal replacement and save on the cost of manufacturing molds.

[0045] This application also discloses a lithium battery top cover.

[0046] like Figure 3 and Figure 4 As shown, a lithium battery top cover includes a cover plate 6, a lower plastic plate 7, a positive terminal module 13, a negative terminal module 14, and rivets 8. The cover plate 6 is fixed to the lower plastic plate 7. In this embodiment, the cover plate 6 is a sheet of smooth aluminum. The cover plate 6 is snapped onto the lower plastic plate 7. The positive terminal module 13 and the negative terminal module 14 are fixed to the cover plate 6 at intervals. Both the positive terminal module 13 and the negative terminal module 14 are the aforementioned lithium battery terminal modules. The lithium battery terminal modules, the cover plate 6, and the lower plastic plate 7 are fixedly connected by rivets 8.

[0047] like Figure 4 , Figure 5 and Figure 6 A through hole 4 on the lithium battery terminal module allows the rivet 8 to pass through. A first through hole 61 for the rivet 8 to pass through is provided on the cover plate 6, and a second through hole 71 for the rivet 8 to pass through is provided on the lower plastic plate 7. In this embodiment, there are two through holes, the first 61 and the second 71, and they are aligned with the through hole 4. The shank of the rivet 8 passes through the second through hole 71 and the first through hole 61 in sequence, then through the annular support edge 3 and the through hole 4 on the terminal 1 in sequence. Pressure is then applied to the end of the shank, causing it to deform. The rivet head and the end of the shank of the rivet 8 tighten and fix the lower plastic plate 7, the cover plate 6, and the lithium battery terminal module. Countersunk holes 81 are provided on both opposite ends of the lower plastic plate 7 and the terminal 1. The two countersunk holes 81 are used to accommodate the rivet head and the deformed end of the rivet 8, respectively. In this embodiment, the rivet head is located in the countersunk hole 81 of the lower plastic plate 7, and the deformed end of the rivet shank is located in the countersunk hole 81 of the terminal 1.

[0048] like Figure 6 and Figure 7 As shown, a sealing sleeve 9 is fitted around the outer periphery of the rivet 8. The sealing sleeve 9 includes a limiting ring 92 and a collar 91 passing through the first through hole 61. The collar 91 and the limiting ring 92 are integrally formed. The first through hole 61 has an annular groove 611 on the edge of the end of the cover plate 6 facing the lower plastic plate 7 to accommodate the limiting ring 92. The limiting ring 92 is clamped between the rivet head of the rivet 8 and the bottom of the annular groove 611. The collar 91 passes through the first through hole 61 and abuts against the annular support edge 3. The sealing sleeve 9 is made of fluororubber, but in other embodiments, it can also be made of other rubbers.

[0049] like Figure 5 and Figure 6 As shown, the lower plastic plate 7 and the cover plate 6 are provided with through holes 62 for the columns 11 that are respectively facing the positive terminal module 13 and the negative terminal module 14. The through holes 62 allow the positive terminal module 13 and the negative terminal module 14 to connect the inside and outside of the lithium battery. A positioning ring 72 is integrally provided on the edge of the through hole 62 of the lower plastic plate 7. The positioning ring 72 passes through the through hole 62 on the cover plate 6 and fits against the inner wall of the sealing ring 5. When installing the sealing ring 5, the sealing ring 5 is fitted onto the positioning ring 72 for easy and accurate installation of the sealing ring 5.

[0050] like Figure 5 , Figure 6 and Figure 8 As shown, the cover plate 6 has an annular protrusion 63 on the edge of the through hole 62, and the sealing ring 5 has a groove 51 on the end face to accommodate the annular protrusion 63. When the sealing ring 5 is installed, the groove 51 is aligned with the annular protrusion 63, and the annular protrusion 63 enters the groove 51. After the sealing ring 5 is compressed, the groove 51 and the annular protrusion 63 are in close contact, which improves the sealing performance of the sealing ring 5.

[0051] When assembling the lithium battery top cover, fix the cover plate 6 onto the lower plastic plate 7, align the first through hole 61 and the second through hole 71, align the through hole 62, and align the positioning ring 72 through the through hole 62 of the cover plate 6. Fit the sealing ring 5 onto the positioning ring 72, and insert the annular protrusion 63 into the groove 51. Align the through hole 4 of the lithium battery terminal module with the first through hole 61. Fit the sealing sleeve 9 onto the rivet 8, and insert the rivet 8 through the second through hole 71, the first through hole 61, and the through hole 4 from one side of the lower plastic cover plate 6. As the rivet 8 is inserted, the collar 91 passes through the second through hole 71 and the first through hole 61 and abuts against the annular support edge 3. The limiting ring 92 enters the annular groove 611, and the rivet head enters the countersunk hole 81 of the lower plastic plate 7. The rivet head abuts the limiting ring 92 against the bottom of the annular groove 611. Finally, an external force is applied to the end of the nail rod, causing it to deform and fill the countersunk hole 81 of the terminal post 1, thus fixing the lithium battery terminal post module to the cover plate 6 and the lower plastic plate 7. The lithium battery terminal post module is installed using a double rivet 8 structure. By designing the same rivet 8 installation positions, any terminal post 1 can be replaced. When changing the top cover, only different terminal posts 1 need to be replaced, eliminating the need to create multiple different molds and saving mold costs. The modular design of the terminal posts 1 allows for faster and more convenient product replacement.

[0052] Example 2

[0053] This application provides a lithium battery terminal module.

[0054] The lithium battery terminal module of this application is the same as that of Embodiment 1.

[0055] This application also discloses a lithium battery top cover.

[0056] A lithium battery top cover, the difference between this embodiment and embodiment one is that the connection method between the rivet 8 and the lower plastic plate 7 is different.

[0057] like Figure 9 and Figure 10 As shown, the rivet 8 is pre-fixed to the lower plastic plate 7. The rivet head of the rivet 8 is fixed to the lower plastic plate 7, and the rivet head of the rivet 8 is injection molded onto the lower plastic plate 7. The rivet shank of the rivet 8 passes through the cover plate 6, the annular support edge 3, and the pole post 1. The lower plastic plate 7 is provided with a groove 93 for accommodating the groove 93 of the limiting ring 92 fitted onto the sealing sleeve 9.

[0058] In this embodiment, the assembly process of the lithium battery top cover is as follows: the head of the rivet 8 is pre-molded onto the lower plastic plate 7; the sealing sleeve 9 is fitted onto the outer periphery of the rivet shank of the rivet 8; the first through hole 61 on the cover plate 6 is aligned with the rivet 8; the rivet 8 passes through the first through hole 61; the collar 91 also passes through the first through hole 61; the limiting ring 92 enters the annular groove 611; the head of the rivet 8 and the bottom of the annular groove clamp the limiting ring 92; then the through hole 4 on the assembled lithium battery terminal module is aligned with the rivet 8; the rivet 8 passes through the through hole 4; an external force is applied to the end of the rivet shank of the rivet 8; the end of the rivet shank deforms; the deformed end of the rivet shank fills the countersunk hole 81 on the terminal 1; the deformed end and the rivet head tighten and fix the lower plastic plate 7, the cover plate 6 and the terminal 1.

[0059] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A lithium battery terminal module, characterized in that, It includes an electrode post and a wrapping ring, the wrapping ring surrounds the outer periphery of the electrode post, and an annular support edge is fixed inside the wrapping ring. The annular support edge abuts against the edge of the end face of the electrode post, and the electrode post and the annular support edge are provided with through holes that pass through both the electrode post and the annular support edge. The pole includes a column and a lug. The lug is fixed to the circumferential side of the column. The annular support edge includes a support ring that abuts against the edge of the column and a support piece corresponding to the lug. The perforation passes through the lug and the support piece. The lithium battery terminal module can be connected to the top cover of the lithium battery by means of a rivet structure that passes through the holes on the terminal and the annular support side in sequence. The lithium battery terminal module also includes a sealing ring, the outer side of which is in contact with the inner side of the annular support edge.

2. A lithium battery top cover, characterized in that, It includes a cover plate, a lower plastic plate, a positive terminal module, and a negative terminal module. The cover plate is fixed to the lower plastic plate, and the positive terminal module and the negative terminal module are fixed to the cover plate at intervals. Both the positive terminal module and the negative terminal module are lithium battery terminal modules as described in claim 1.

3. The lithium battery top cover according to claim 2, characterized in that, It also includes rivets, the through hole for the rivets to pass through, the cover plate has a first through hole for the rivets to pass through, and the pole module, the cover plate and the lower plastic plate are fixedly connected by the rivets.

4. The lithium battery top cover according to claim 2, characterized in that, The lower plastic plate and the cover plate are provided with through holes facing the positive terminal module and the negative terminal module respectively. The through holes allow the positive terminal module and the negative terminal module to communicate with the inside and outside of the lithium battery. A positioning ring is provided on the edge of the through hole of the lower plastic plate. The positive terminal module and the negative terminal module are both lithium battery terminal modules as described in claim 1. The positioning ring passes through the through hole of the cover plate and fits against the inner wall of the sealing ring.

5. The lithium battery top cover according to claim 4, characterized in that, The cover plate has an annular protrusion on the edge of the through hole, and the sealing ring has a groove on its end face to accommodate the annular protrusion.

6. The lithium battery top cover according to claim 3, characterized in that, The lower plastic plate is provided with a second through hole for the rivet to pass through. The rivet shank passes through the second through hole and the first through hole in sequence, and then passes through the through hole on the annular support edge and the pole in sequence. The lower plastic plate and the pole are provided with countersunk holes on their opposite ends. The two countersunk holes are respectively used to accommodate the rivet head and the deformed end of the rivet shank.

7. The lithium battery top cover according to claim 3, characterized in that, The rivet head is fixed to the lower plastic plate, and the rivet shank passes through the cover plate, the annular support edge and the pole post. The pole post is provided with a countersunk hole for accommodating the deformed end of the rivet shank.

8. The lithium battery top cover according to claim 6 or 7, characterized in that, A sealing sleeve is provided around the rivet. The sealing sleeve includes a limiting ring and a collar that passes through the first through hole. The first through hole has an annular groove on the edge of the end of the cover plate facing the lower plastic plate to accommodate the limiting ring. The limiting ring is clamped between the rivet head and the bottom of the annular groove. The collar passes through the first through hole and abuts against the annular support edge.

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