Battery liquid supplementing structure and battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery liquid supplementing structure and a battery, the battery liquid supplementing structure comprises a liquid supplementing hole, a baffle plate positioned at the bottom and a filling part sealed at the top of the baffle plate are arranged in the liquid supplementing hole; the filling part is made of a thermoplastic material and can be taken out during heating, and a channel is formed in the baffle and allows the electrolyte to enter the battery; and the filling part can be formed again at the top of the baffle by adopting the thermoplastic material, so that the liquid supplementing hole is blocked. According to the utility model, the filling part is made of the thermoplastic material and is used as a filling agent of the liquid supplementing hole to seal the liquid supplementing hole, so that the liquid supplementing hole can be conveniently taken out and sealed, the sealing effect is good, the operation is simple, the implementation is easy, and the safety and the practicability of the liquid supplementing hole are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery liquid replenishing structure and a battery. Background Art

[0002] A battery's filling port is essential for injecting electrolyte into the battery. It also serves as a crucial venting channel during the battery's formation process. After formation and capacity separation, the port is sealed, typically with a steel ball or laser seal. Once sealed, the port is typically non-removable. However, batteries can still fail during use due to other factors, such as electrolyte depletion.

[0003] Electrolyte depletion is a common battery failure mode. Electrolyte depletion, leading to cycle drop and failure, increases the after-sales costs of battery manufacturers. In this case, timely electrolyte replenishment is sufficient to reactivate battery performance. However, the current structural design of electrolyte replenishment has poor sealing effect and is inconvenient to operate. Therefore, a new electrolyte replenishment structure is urgently needed to solve the defect of batteries being scrapped after failure. Utility Model Content

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a battery liquid replenishing structure and a battery.

[0005] According to the utility model, a battery liquid filling structure is provided, comprising a liquid filling hole, wherein the liquid filling hole is provided with a baffle at the bottom and a filling portion enclosed at the top of the baffle;

[0006] The filling portion is made of thermoplastic material and can be removed when heated. A channel is provided on the baffle, and the channel allows the electrolyte to enter the interior of the battery. When the electrolyte in the battery is replenished, the filling portion can be formed again on the top of the baffle using the thermoplastic material to seal the liquid replenishment hole.

[0007] Preferably, the thickness of the baffle is 0.1mm-1㎜.

[0008] Preferably, the channel adopts a hole structure and / or a slot structure.

[0009] Preferably, the hole structure is a plurality of holes arranged in an array on the baffle.

[0010] Preferably, the diameter of the hole is 0.1 mm-0.2 mm.

[0011] Preferably, the seam structure is a first pressure seam, and the first pressure seam is located in the middle of the baffle and is cross-distributed.

[0012] Preferably, the seam structure is a second pressure seam, and the second pressure seam is a structure extending from the edge of the baffle toward an inner position.

[0013] Preferably, the thermoplastic material is any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, polysulfone, polyphenylene ether polypropylene, acrylonitrile-butadiene-styrene, polycarbonate, polyurethane, polytetrafluoroethylene, and polyethylene terephthalate.

[0014] Preferably, the fluid infusion hole has a side wall, and the side wall is provided with a concave-convex groove.

[0015] A battery provided by the present invention includes the battery liquid replenishing structure.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model sets the filling part as a thermoplastic material as the filler of the liquid infusion hole to seal the liquid infusion hole. When liquid infusion or exhaust is needed, the thermoplastic material can be taken out by melting the thermoplastic material, and then the liquid infusion or exhaust is completed. After the liquid infusion or exhaust is completed, the thermoplastic material is used to fill and seal. The sealing effect is good, the operation is simple, and it is easy to implement, which greatly improves the safety and practicality of the liquid infusion hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0019] Figure 1 Schematic diagram of the structure of the top cover;

[0020] Figure 2 Schematic diagram of the cross section of the fluid infusion hole;

[0021] Figure 3 Schematic diagram of the cross section of the side wall of the fluid infusion hole;

[0022] Figure 4 A schematic top view of the structure when the channel of the baffle is designed as a hole;

[0023] Figure 5 A schematic top view of the structure when the baffle channel is designed as a cross gap;

[0024] Figure 6 This is a top view of the structure when the baffle channel is designed to have no cross gaps.

[0025] The figure shows:

[0026] Top cover 1

[0027] Side wall 11

[0028] Concave and convex groove 12

[0029] Positive column 2

[0030] Rehydration port 3

[0031] Filling portion 31

[0032] Baffle 32

[0033] Hole 321

[0034] First pressure seam 322

[0035] Second pressure seam 323

[0036] Explosion-proof valve 4

[0037] Injection hole 5

[0038] Negative column 6 DETAILED DESCRIPTION

[0039] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any way. It should be noted that a person skilled in the art may make various variations and improvements without departing from the scope of the present invention. Such variations and improvements are all within the scope of protection of the present invention.

[0040] Example 1:

[0041] like Figure 2 As shown, the present invention provides a battery refilling structure, including a refilling hole 3, a baffle 32 at the bottom of the refilling hole 3, and a filling portion 31 enclosed on top of the baffle 32. The filling portion 31 is made of a thermoplastic material. During manufacture, the thermoplastic material is heated and melted, and then filled into the space above the baffle 32. The molten thermoplastic material solidifies after cooling and is then sealed above the baffle 32, thereby sealing the refilling hole 3. When the battery requires refilling, the thermoplastic material blocking the refilling hole 3 can be heated, causing the thermoplastic material to change from a solid state to a molten state due to the heat. The molten thermoplastic material can then be easily removed, facilitating refilling operations. In other words, the filling portion 31, made of thermoplastic material, achieves both sealing and unsealing purposes, making operation simple, convenient, and easy to implement, greatly improving the convenience of sealing and unsealing the refilling hole 3.

[0042] In practical applications, thermoplastic materials are available in a variety of materials. Specifically, the thermoplastic material can be any of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, polysulfone, polyphenylene ether polypropylene, acrylonitrile-butadiene-styrene, polycarbonate, polyurethane, polytetrafluoroethylene, and polyethylene terephthalate. The material selection can be determined based on the market price and actual performance of the various materials. It should be noted that the above-mentioned thermoplastic materials are all known existing materials.

[0043] Furthermore, the baffle 32 is preferably made of metal. The metal baffle can be made of a single metal or a composite of multiple metals. For example, the metal baffle is made of aluminum foil. The design of the metal baffle involves strength requirements and certain thickness requirements. The thickness of the metal baffle is preferably 0.1 mm to 1 mm, and can be, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, etc.

[0044] Specifically, to ensure smooth refilling of the refill hole 3 while minimizing impact on the battery's interior, a channel is provided on the baffle 32. This channel allows electrolyte to pass through, allowing the electrolyte to enter the battery's interior. Specifically, the channel utilizes a hole structure, a slit structure, or both, for refilling after battery failure. Once the battery's electrolyte is fully replenished, a thermoplastic material is melted, cooled, and solidified to form a filling portion 31 at the top of the baffle 32, thereby sealing the space above the baffle 32. This securely blocks the refill hole 3 and ensures safe battery operation.

[0045] The hole structure and / or slit structure used in the channel of the present invention has a variety of arrangements. When the channel adopts a hole structure, the hole structure on the baffle 32 can be arranged in a variety of ways. Usually, multiple holes 321 are densely distributed on the baffle 32. For example, the hole structure on the baffle 32 is a plurality of holes 321 arranged in an array. When the channel adopts a slit, it also has a variety of arrangements. For example, the channel is a plurality of slits arranged on the baffle 32. The plurality of slits may or may not cross. In actual applications, the channel can also be designed as a structure in which multiple slits and multiple holes 321 on the baffle 32 are arranged in a mixed manner. For example, one side of the baffle 32 is a hole structure, and the other side of the baffle 32 is a slit. For another example, the slits and holes 321 on the baffle 32 are arranged in an alternating manner. When designing specifically, it can be flexibly selected according to the actual application scenario. Under the premise of ensuring the rehydration effect, the actual product requirements of simple structure, convenient processing and low cost are met.

[0046] The utility model also provides a battery, including a battery liquid replenishing structure. The battery is provided with a top cover, a top cover sheet 1 is provided on the top cover, and a liquid replenishing hole 3 is provided on the top cover sheet 1. The structure is simple and the operation is convenient.

[0047] Example 2:

[0048] This embodiment is a preferred example of embodiment 1.

[0049] This embodiment provides a battery such as Figure 1 As shown, a top cover sheet 1 is provided on the top cover, and a positive electrode column 2, a liquid replenishing hole 3, an explosion-proof valve 4, a liquid injection hole 5, and a negative electrode column 6 are provided on the top cover sheet 1, wherein the positive electrode column 2, the liquid replenishing hole 3, the explosion-proof valve 4, the liquid injection hole 5, and the negative electrode column 6 are arranged in sequence on the top cover sheet 1 along the length direction of the top cover sheet 1.

[0050] Specifically, the liquid infusion hole 3 is provided with a filling portion 31 and a baffle 32, and the filling portion 31 is arranged above the baffle 32. Figure 2 As shown, the filling portion 31 is made of thermoplastic material. Its purpose is to seal the baffle 32 and ensure excellent sealing of the fluid filling port 3 during normal battery use. The baffle 32 is preferably made of metal. When the electrolyte in the battery dries up, battery performance can be restored by adding fluid to the battery. To do this, the thermoplastic filling portion 31 is first heated to melt the filling portion 31 from a solid state. Once melted, the filling portion 31 can be easily removed. After removal, the baffle 32 is exposed. At this point, a fluid replenishment device can be connected to the fluid filling port 3 to deliver electrolyte to the baffle 32. The electrolyte enters the battery through the gaps and / or holes 321 in the baffle 32, ultimately completing the fluid replenishment operation. After the fluid replenishment is completed, the thermoplastic material is heated and melted, and then cooled to seal the space above the baffle 32, thereby sealing the fluid filling port 3. The fluid replenishment operation is now complete.

[0051] like Figure 3 As shown, the fluid filling hole 3 has a side wall 11. After the thermoplastic material solidifies, it is integrally connected to the side wall 11. To improve the sealing performance of the thermoplastic material and increase the firmness of the filling portion 31, the side wall 11 is provided with a concave-convex groove 12. The concave-convex groove 12 serves to strengthen the sealing and pressure resistance of the filling portion 31. When the battery generates high pressure during cycling, the sealing of the filling portion 31 needs to be strengthened to prevent safety hazards caused by leakage from the fluid filling hole 3.

[0052] Furthermore, the concave-convex groove 12 can be set as a plurality of continuous grooves in the axial direction of the fluid infusion hole 3, and a convex tip is formed at the connection between two adjacent grooves. The molten thermoplastic material enters the interior of the groove, and after solidification, the part of the filling part 31 extending into the groove forms a boss. The boss and the convex tip interfere with each other in the axial direction of the fluid infusion hole 3, thereby increasing the firmness of the entire filling part 31.

[0053] It should be noted that the concave-convex groove 12 on the side wall 11 has a variety of structural forms. The groove can be designed as a continuous annular groove or a discontinuous annular groove. It can be flexibly selected according to the actual scenario. At the same time, the width of the convex tip can also be designed accordingly to meet the firmness requirements of the filling part 31.

[0054] Specifically, batteries form modules, and modules form battery packs. Generally speaking, when a battery undergoes a cycle dive, the entire module is scrapped because there is no way to disassemble the module and replace the battery. However, in the present invention, a refill hole 3 is provided, and the filling portion 31 can be destroyed by heating, and the filling portion 31 can be reformed by hot melt solidification. This makes it possible to rescue a single battery and refill the battery, so that the originally scrapped battery can be repaired and reused. Compared with the existing technology, the after-sales cost of the battery is greatly reduced.

[0055] The channel on the baffle 32 can be designed as a variety of structures. In one possible embodiment, the channel is designed as a hole structure, such as Figure 4 As shown, a hole 321 is provided on the baffle 32. The purpose of designing the hole 321 is to allow the electrolyte to flow smoothly into the interior of the battery to achieve battery electrolyte replenishment. The diameter of the hole 321 is 0.1mm-0.2mm, such as 0.1mm, 0.11mm, 0.12mm, 0.12mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, etc. The diameter of the hole 321 is set within this range to allow the electrolyte to be smoothly injected into the interior of the battery while preventing the thermoplastic material from flowing into the battery in a molten state, thereby effectively preventing contamination inside the battery. In another possible embodiment, the channel on the baffle 32 is set as a slit structure, such as Figure 5 As shown, the channel is designed as a first pressure slit 322. The first pressure slit 322 can be opened only when the external pressure reaches a certain level. The first pressure slit 322 is located in the middle of the baffle 32 and is designed as a cross-distributed structure, thereby allowing the electrolyte to pass through while preventing the molten thermoplastic material from passing through. In another possible embodiment, the channel on the baffle 32 is configured as a second pressure slit 323. The second pressure slit 323 is a structure extending from the edge of the baffle 32 to other positions, such as Figure 6As shown, the second pressure slots 323 are arranged on the baffle 32 in a discontinuous parallelogram track, which can also achieve the effect of allowing the electrolyte to pass through and preventing the molten thermoplastic material from passing through.

[0056] The working principle of the utility model of injecting electrolyte is as follows:

[0057] When a battery cycle is interrupted, the battery is first disassembled from the battery pack, the refill hole 3 is found, and the filling portion 31 made of thermoplastic material is softened to a molten state by heating. The molten filling portion 31 is removed to expose the baffle 32. At this time, the device for replenishing electrolyte is connected to the refill hole 3, and the electrolyte required inside the battery enters the interior of the battery through the gaps and / or holes 321 on the baffle 32, finally completing the operation of injecting electrolyte into the battery through the refill hole 3. After the injection is completed, the thermoplastic material is heated and melted, and then injected into the space above the baffle 32. The molten thermoplastic material solidifies above the baffle 32 to form the filling portion 31, thereby sealing the refill hole 3. At this point, the refill operation is complete.

[0058] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0059] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A battery refilling structure, characterized in that: The liquid replenishing hole (3) is provided with a baffle (32) at the bottom and a filling portion (31) enclosed on the top of the baffle (32); The filling portion (31) is made of a thermoplastic material and can be removed when heated. A channel is provided on the baffle (32) and the channel allows the electrolyte to enter the interior of the battery. When the electrolyte in the battery is replenished, the filling portion (31) can be formed again on the top of the baffle (32) by using the thermoplastic material to block the liquid replenishing hole (3).

2. The battery liquid replenishing structure according to claim 1, characterized in that: The thickness of the baffle (32) is 0.1 mm to 1 mm.

3. The battery liquid replenishing structure according to claim 1, characterized in that: The channel adopts a hole structure and / or a slot structure.

4. The battery liquid replenishing structure according to claim 3, characterized in that: The hole structure is a plurality of holes (321) arranged in an array on the baffle (32).

5. The battery liquid replenishing structure according to claim 4, characterized in that: The diameter of the hole (321) is 0.1 mm to 0.2 mm.

6. The battery liquid replenishing structure according to claim 3, characterized in that: The seam structure is a first pressure seam (322), and the first pressure seam (322) is located in the middle of the baffle (32) and is cross-distributed.

7. The battery liquid replenishing structure according to claim 3, characterized in that: The seam structure is a second pressure seam (323), and the second pressure seam (323) is a structure extending from the edge of the baffle (32) toward an inner position.

8. The battery liquid replenishing structure according to claim 1, characterized in that: The thermoplastic material is any one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyoxymethylene, polycarbonate, polyamide, polysulfone, polyphenylene ether polypropylene, acrylonitrile-butadiene-styrene, polyurethane, polytetrafluoroethylene, and polyethylene terephthalate.

9. The battery liquid replenishing structure according to claim 1, characterized in that: The fluid replenishing hole (3) has a side wall (11), and a concave-convex groove (12) is provided on the side wall (11).

10. A battery, characterized in that: The battery liquid replenishing structure comprises the battery liquid replenishing structure according to any one of claims 1 to 9.

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