Battery liquid injection port structure and battery

Abstract

The utility model provides a battery liquid injection port structure and a battery, and the battery liquid injection port structure comprises a top cover, a sealing cover part and an elastic piece, the top cover is used for sealing the battery, a liquid injection opening is formed in the top cover and used for exhausting or supplementing liquid to the battery, the sealing cover part is arranged at one end of the liquid injection opening and is detachably connected with the top cover, the liquid injection opening can be sealed through the sealing cover part, the elastic piece is arranged between the top cover and the sealing cover part and is arranged around the axis of the liquid injection opening, and after the sealing cover part is connected with the top cover, the elastic piece is connected with the top cover. And the elastic piece can be compressed by a first preset distance. The sealing performance of the liquid injection port can be guaranteed through the elastic piece, the original welding procedure is replaced through the detachable connection relation between the top cover and the sealing cover part, the production yield of the lithium ion battery is greatly improved, the production cost is reduced, meanwhile, later maintenance is facilitated under the condition that the battery structure is not damaged, and the production efficiency is improved. The service life of the lithium ion battery is prolonged, and the use cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery structures, and particularly relates to a battery liquid injection port structure and a battery. Background Art

[0002] Lithium-ion batteries have been widely used in many fields such as 3C consumer electronics, power batteries, and energy storage, which has made people pay more and more attention to the production and manufacturing process of lithium-ion batteries. Among them, how to reduce the production and use costs of lithium-ion batteries is one of the important issues that people are concerned about.

[0003] Existing lithium-ion batteries generally seal the liquid injection port of the battery cell by welding. However, during the production process of the battery, it is very easy to produce explosion points when laser welding the liquid injection port, resulting in poor welding, which will cause the battery cell to be scrapped, reduce the production yield of lithium-ion batteries, and increase production costs. In addition, once the lithium-ion battery completes the laser welding process of the liquid injection port of the battery cell, the liquid injection port cannot be unsealed again. If the lithium-ion battery fails due to flatulence, electrolyte drying up, etc. during the later use of the lithium-ion battery, the lithium-ion battery will be quickly scrapped due to performance degradation, which greatly affects the service life of the lithium-ion battery and increases the cost of use.

[0004] Therefore, the production and use costs of existing lithium-ion batteries are relatively high. Utility Model Content

[0005] In view of the above problems, the utility model provides a battery liquid filling port structure and a battery, wherein the battery liquid filling port structure comprises:

[0006] A top cover for sealing the battery;

[0007] The top cover is provided with a liquid filling port for exhausting or replenishing liquid from the battery;

[0008] A sealing portion, which is disposed at one end of the liquid injection port and is detachably connected to the top cover, and the liquid injection port can be sealed by the sealing portion;

[0009] An elastic member, the elastic member is arranged between the top cover and the sealing cover portion and is arranged around the axis of the liquid injection port;

[0010] After the sealing cover is connected to the top cover, the elastic member can be compressed by a first preset distance.

[0011] In some specific embodiments, the cover portion includes:

[0012] A sealing component, one end of which can be inserted into the liquid injection port to seal the liquid injection port;

[0013] A positioning component is arranged at the other end of the sealing component and can be detachably connected to the top cover to position the sealing component.

[0014] In some specific embodiments, the sealing assembly includes:

[0015] An abutment block, used for abutting against the elastic member;

[0016] A plug-in rod is arranged on one side of the abutment block and is used for plugging with the liquid injection port.

[0017] In some specific embodiments, the top cover is further provided with a first positioning hole;

[0018] The positioning component comprises:

[0019] At least one positioning block is disposed on one side of the abutting block, and a second positioning hole is formed on the positioning block;

[0020] The second positioning hole and the first positioning hole are adapted to each other so that the second positioning hole and the first positioning hole can be connected by a positioning rod.

[0021] In some specific embodiments, the plug rod is threadedly connected to the liquid injection port.

[0022] In some specific embodiments, a sealing groove is formed on one side of the top cover close to the abutment block. The sealing groove is arranged around the axis of the liquid injection port and is used to place the elastic member.

[0023] In some specific embodiments, the positioning rod is threadedly connected to the first positioning hole and the second positioning hole.

[0024] In some specific embodiments, the top cover comprises:

[0025] A first cover body, wherein the liquid injection port, the sealing groove and the first positioning hole are all provided on the first cover body;

[0026] a second cover body, the second cover body being arranged on a side of the first cover body around an axis of the first cover body;

[0027] The thickness of the second cover body is smaller than the thickness of the first cover body.

[0028] In some specific embodiments, the elastic member is an annular structure.

[0029] A battery based on the same concept includes the battery liquid filling port structure as described in any of the above specific embodiments.

[0030] The battery liquid filling port structure of the utility model can ensure the sealing of the liquid filling port by means of an elastic member arranged between the top cover and the sealing part. In addition, the detachable connection between the top cover and the sealing part replaces the original welding process for the liquid filling port, which can greatly improve the production yield in the production process of lithium-ion batteries and reduce production costs. At the same time, it can also allow staff to perform post-maintenance without destroying the battery structure, and can be resealed after exhausting or replenishing the liquid through the liquid filling port, thereby increasing the service life of the lithium-ion battery and reducing the cost of use.

[0031] The battery of the utility model includes the above-mentioned battery liquid filling port structure, so it has the same beneficial effects as the above-mentioned battery liquid filling port structure, which will not be described in detail here.

[0032] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 A side cross-sectional view of a battery liquid filling port structure in an embodiment of the utility model is shown;

[0035] Figure 2 A schematic top view of the sealing cover in an embodiment of the utility model is shown.

[0036] In the figure, 100, top cover; 110, first cover body; 111, liquid filling port; 112, sealing groove; 113, first positioning hole; 120, second cover body; 200, sealing portion; 210, sealing assembly; 211, abutment block; 212, plug-in rod; 220, positioning assembly; 221, positioning block; 2211, second positioning hole; 222, positioning rod; 300, elastic member. DETAILED DESCRIPTION

[0037] 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 of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] Reference Figure 1 and Figure 2 , a battery filling port structure is provided, comprising: a top cover 100, a sealing portion 200 and an elastic member 300. The top cover 100 is used to seal the battery so that the battery as a whole can be formed. A filling port 111 is provided on the top cover 100, and the battery can be vented or replenished through the filling port 111. The sealing portion 200 is arranged at one end of the filling port 111, and the sealing portion 200 can be detachably connected to the top cover 100, so that the filling port 111 can be sealed through the sealing portion 200. The elastic member 300 is arranged between the top cover 100 and the sealing portion 200, and the elastic member 300 is arranged around the axis of the filling port 111. When the sealing portion 200 is connected to the top cover 100, the elastic member 300 can be compressed by a first preset distance.

[0039] Specifically, the liquid injection port 111 is opened in the middle of the top cover 100, and the cover part 200 is arranged above the middle of the top cover 100, so that the bottom surface of the cover part 200 can cover the top of the liquid injection port 111. The elastic member 300 is arranged between the bottom surface of the cover part 200 and the top surface of the top cover 100, and the elastic member 300 is also arranged around the axis of the liquid injection port 111. When the cover part 200 is connected to the top cover 100, as the cover part 200 continuously moves toward the direction close to the top cover 100, the elastic member 300 that abuts against the bottom surface of the cover part 200 and the top surface of the top cover 100 respectively will be compressed due to the reduction of the spacing between the cover part 200 and the top cover 100, and under the elastic property of the elastic member 300, the gap between the cover part 200 and the top cover 100 can be filled, thereby ensuring the sealing of the top of the liquid injection port 111. Furthermore, since the sealing part 200 and the top cover 100 are detachably connected, during the production process of the battery, there will no longer be explosion points or poor welding caused by laser welding, which will lead to the scrapping of the battery core, thereby improving the production yield of the battery and reducing the production cost. At the same time, if the battery fails due to bloating, electrolyte drying up, etc. during subsequent use, the sealing part 200 can be removed from the top cover 100, and then resealed after venting or replenishing the electrolyte through the injection port 111, so that the staff can perform subsequent maintenance without destroying the battery structure, thereby extending the service life and reducing the use cost.

[0040] It should be noted that the batteries mentioned above and later refer to lithium-ion batteries.

[0041] Furthermore, the elastic member 300 is an integrated annular structure, so that the liquid injection port 111 can be completely surrounded by the elastic member 300 to ensure sealing.

[0042] Furthermore, the elastic member 300 may be a sealing ring, thereby facilitating meeting the requirement of the annular structure of the elastic member 300 .

[0043] Furthermore, the elastic member 300 is made of fluororubber, which has good electrolyte resistance and can reduce the influence of corrosion.

[0044] In some specific embodiments of the present invention, refer to Figure 1 The cover portion 200 includes: a sealing component 210 and a positioning component 220. One end of the sealing component 210 can be inserted into the interior of the liquid injection port 111, and the sealing component 210 can fill the interior of the liquid injection port 111, further seal the liquid injection port 111, and ensure the sealing of the liquid injection port 111. The positioning component 220 is disposed at the other end of the sealing component 210, and the positioning component 220 can be detachably connected to the top cover 100, so that the setting position of the sealing component 210 can be positioned by the positioning component 220, and the connection between the sealing component 210 and the top cover 100 is reinforced, thereby ensuring the sealing of the liquid injection port 111.

[0045] In some specific embodiments of the present invention, refer to Figure 1 The sealing assembly 210 includes: an abutment block 211 and a plug rod 212. The abutment block 211 is disposed above the middle of the top cover 100, and can abut against the top of the elastic member 300 through the abutment block 211. One end of the plug rod 212 is fixedly connected to the middle of the bottom surface of the abutment block 211, and the other end can be plugged into the liquid injection port 111, thereby further sealing the liquid injection port 111.

[0046] Furthermore, the outer wall of the plug-in rod 212 is provided with a first external thread. The inner wall of the liquid injection port 111 is provided with a first internal thread. The first external thread and the first internal thread are adapted to each other, so that the plug-in rod 212 can be threadedly connected with the liquid injection port 111. When the plug-in rod 212 is connected with the liquid injection port 111, the sealing performance of the liquid injection port 111 can be greatly improved through the misalignment structure between the first external thread and the first internal thread. At the same time, the threaded connection between the plug-in rod 212 and the liquid injection port 111 is also convenient for disassembly.

[0047] Further, the sealing assembly 210 may be a sealing screw.

[0048] In some specific embodiments of the present invention, refer to Figure 1, a first positioning hole 113 is also provided on the top cover 100. The positioning assembly 220 includes: a positioning block 221 and a positioning rod 222. Among them, there is at least one positioning block 221, and the positioning block 221 is arranged on one side of the abutting block 211, and a second positioning hole 2211 is provided on the positioning block 221. The second positioning hole 2211 and the first positioning hole 113 are adapted to each other, so that one end of the positioning rod 222 can pass through the second positioning hole 2211 and be inserted into the first positioning hole 113, so that the second positioning hole 2211 and the first positioning hole 113 can be connected through the positioning rod 222, thereby realizing the positioning setting of the abutting block 211, reinforcing the abutting block 211, and preventing the abutting block 211 from loosening and falling.

[0049] Further, the outer wall of the positioning rod 222 is provided with a second external thread. The inner wall of the first positioning hole 113 is provided with a second internal thread. The inner wall of the second positioning hole 2211 is provided with a third internal thread. The second external thread, the second internal thread and the third internal thread are adapted to each other. By passing the positioning rod 222 through the second positioning hole 2211 and inserting it into the first positioning hole 113, the positioning rod 222 can be threadedly connected with the second positioning hole 2211 and the first positioning hole 113 in turn, thereby ensuring the stability of the positioning reinforcement of the abutment block 211.

[0050] Furthermore, one end of the positioning block 221 is fixedly connected to the side wall of the abutment block 211, and the other end extends along the radial direction of the abutment block 211. Therefore, the positioning block 221 can not only position the abutment block 211, but also, when the plug-in rod 212 and the liquid injection port 111 are in a threaded connection relationship, by moving the positioning block 221, the abutment block 211 drives the plug-in rod 212 to rotate, so as to complete the installation or disassembly work.

[0051] Further, refer to Figure 2 There are multiple positioning blocks 221, and the multiple positioning blocks 221 are evenly distributed around the axis of the abutment block 211. Each positioning block 221 is provided with a second positioning hole 2211. The top cover 100 is also provided with a plurality of first positioning holes 113. Moreover, the plurality of second positioning holes 2211 and the plurality of first positioning holes 113 are arranged one by one, and each group of correspondingly arranged first positioning holes 113 and second positioning holes 2211 can be connected by a positioning rod 222, so as to further improve the setting stability of the abutment block 211 and avoid loosening between the plug-in rod 212 and the liquid injection port 111.

[0052] It should be noted that when the plug-in rod 212 is in a threaded connection relationship with the injection port 111, the first positioning hole 113 and the second positioning hole 2211 may be in a threaded connection relationship with the positioning rod 222, or may not be in a threaded connection relationship, and may be simply plugged in. When the plug-in rod 212 is not in a threaded connection relationship with the injection port 111, the first positioning hole 113 and the second positioning hole 2211 need to be in a threaded connection relationship with the positioning rod 222, and at this time, it is best to set at least two positioning blocks 221, so as to ensure the sealing of the injection port 111.

[0053] In some specific embodiments of the present invention, refer to Figure 1 A sealing groove 112 is provided in the middle of the top surface of the top cover 100. The sealing groove 112 is an annular structure, so that the sealing groove 112 can be arranged around the axis of the liquid injection port 111. The sealing groove 112 is used to place the elastic member 300, and the elastic member 300 placed on the sealing groove 112 can just surround the top of the liquid injection port 111.

[0054] Furthermore, the distance between the inner diameter and the outer diameter of the sealing groove 112 is greater than the radius of the plug-in rod 212, thereby ensuring the stability of the overall structure after connection.

[0055] Furthermore, the height dimension of the sealing groove 112 is smaller than the height dimension of the elastic member 300. Thus, the elastic effect of the elastic member 300 can be fully exerted to ensure the sealing effect.

[0056] Furthermore, the height of the elastic member 300 is at least 10% greater than the height of the sealing groove 112, which can further improve the sealing effect.

[0057] Furthermore, the height of the elastic member 300 is 3 mm, and the height of the sealing groove 112 is 2 mm. Moreover, after the liquid injection port 111 is sealed, the compression amount of the elastic member 300 is 0.6 mm, and the compression ratio of the elastic member 300 is about 20%, which can further improve the sealing effect.

[0058] In some specific embodiments of the present invention, refer to Figure 1The top cover 100 includes: a first cover body 110 and a second cover body 120. Among them, the liquid injection port 111, the sealing groove 112 and the first positioning hole 113 are all opened on the first cover body 110. The second cover body 120 is arranged on the side of the first cover body 110 around the axis of the first cover body 110. The second cover body 120 can surround the first cover body 110, and the thickness of the second cover body 120 is smaller than the thickness of the first cover body 110. The thinner second cover body 120 is convenient for installation with the battery shell, while the thicker first cover body 110 can ensure that the depth of the set liquid injection port 111 can meet the sealing requirements, so that the sealing of the liquid injection port 111 can be ensured while ensuring the installation stability of the battery liquid injection port structure.

[0059] Furthermore, the thickness of the second cover 120 is 2 mm, and the depth of the liquid injection port 111 is 8 mm, thereby ensuring structural stability.

[0060] The utility model also provides a battery, including the battery liquid filling port structure as described in any of the above specific embodiments. Since the battery includes the above battery liquid filling port structure, the battery has the same beneficial effects as the above battery liquid filling port structure, which will not be repeated here.

[0061] Experimental data:

[0062] Control group: Use the injection port with ordinary structure commonly found on the market.

[0063]

[0064] Table 1. Test results of the liquid injection port structure of the present invention and the traditional liquid injection port structure

[0065] By comparison, it can be seen that the liquid filling port structure provided by the utility model no longer has a sealing failure rate, and the sealed battery can be maintained later.

[0066] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery filling port structure, characterized in that: include: A top cover for sealing the battery; The top cover is provided with a liquid filling port for exhausting or replenishing liquid from the battery; A sealing portion, which is disposed at one end of the liquid injection port and is detachably connected to the top cover, and the liquid injection port can be sealed by the sealing portion; An elastic member, the elastic member is arranged between the top cover and the sealing cover portion and is arranged around the axis of the liquid injection port; After the sealing cover is connected to the top cover, the elastic member can be compressed by a first preset distance.

2. The battery liquid filling port structure according to claim 1, characterized in that: The sealing portion comprises: A sealing component, one end of which can be inserted into the liquid injection port to seal the liquid injection port; A positioning component is arranged at the other end of the sealing component and can be detachably connected to the top cover to position the sealing component.

3. The battery liquid filling port structure according to claim 2, characterized in that: The sealing assembly comprises: An abutment block, used for abutting against the elastic member; A plug-in rod is arranged on one side of the abutment block and is used for plugging with the liquid injection port.

4. The battery liquid filling port structure according to claim 3, characterized in that: The top cover is also provided with a first positioning hole; The positioning component comprises: At least one positioning block is disposed on one side of the abutting block, and a second positioning hole is formed on the positioning block; The second positioning hole and the first positioning hole are adapted to each other so that the second positioning hole and the first positioning hole can be connected by a positioning rod.

5. The battery liquid filling port structure according to claim 3, characterized in that: The plug-in rod is threadedly connected to the liquid injection port.

6. The battery liquid filling port structure according to claim 4, characterized in that: A sealing groove is provided on one side of the top cover close to the abutment block. The sealing groove is arranged around the axis of the liquid injection port and is used for accommodating the elastic member.

7. The battery liquid filling port structure according to claim 4, characterized in that: The positioning rod is threadedly connected to the first positioning hole and the second positioning hole.

8. The battery liquid filling port structure according to claim 6, characterized in that: The top cover comprises: A first cover body, wherein the liquid injection port, the sealing groove and the first positioning hole are all provided on the first cover body; a second cover body, the second cover body being arranged on a side of the first cover body around an axis of the first cover body; The thickness of the second cover body is smaller than the thickness of the first cover body.

9. The battery liquid filling port structure according to any one of claims 1 to 8, characterized in that: The elastic member is an annular structure.

10. A battery, characterized in that: It comprises a battery liquid filling port structure as described in any one of claims 1 to 9.

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