Plastic nail safety tube structure of power battery

Abstract

The utility model discloses a rubber nail safety tube structure of a power battery, the power battery comprises a shell and a roll core arranged in the shell, the roll core is provided with a central hole, a safety tube is arranged corresponding to the central hole, the safety tube is inserted in the central hole, the safety tube comprises a tube body, the tube body is provided with a first end and a second end opposite to the first end, and the second end is provided with a second end opposite to the first end. The first end is provided with an opening, the opening is arranged around the rubber nail, the tube body is also provided with a sieve pore part, the sieve pore part is provided with a plurality of safety through holes, and the outer peripheral wall of the sieve pore part is connected with the inner peripheral wall of the tube body so that the electrolyte entering the tube body passes through the sieve pore part. The safety pipe is arranged in the center hole, and the opening of the safety pipe corresponds to the rubber nail, so that the falling rubber nail or a part of broken nail of the rubber nail is kept in the safety pipe, and the roll core is not influenced; and the production yield of the power battery is effectively improved, and the short-circuit fire risk caused by falling of the rubber nails after the power battery is loaded and vibrated is avoided.

Description

Technical Field

[0001] This utility model relates to the field of power batteries, and in particular to a safety tube structure for a power battery. Background Technology

[0002] Currently, lithium-ion or sodium-ion cylindrical batteries are gradually becoming the mainstream products in the new energy industry due to their advantages such as high energy density, good capacity consistency, and ability to support high-rate charging and discharging. More and more manufacturers are pursuing high safety for cylindrical batteries while also trying to improve production yield. Common questions:

[0003] 1. During the production of cylindrical power batteries, the problem of broken nails cannot be avoided when applying or inserting glue nails. The broken nails may escape into the gap between the core and the shell cover. As the positive and negative electrodes are charged and discharged, the thickness rebounds, and the glue nail squeezes the electrode sheet, causing the battery to catch fire / explode. Therefore, the battery with broken nails can only be scrapped directly, which affects the production yield of cylindrical power batteries.

[0004] 2. When a cylindrical power battery is installed in a vehicle and vibrates, if the rubber nails attached to the injection hole fall into the battery and escape into the gap between the core and the casing, the thickness of the positive and negative electrodes will rebound and expand after long-term charging and discharging, squeezing the internal space. This may cause the rubber nails to passively squeeze the separator and the positive and negative electrode sheets, leading to a short circuit and fire. Summary of the Invention

[0005] The purpose of this utility model is to provide a safety tube structure for a power battery with a rubber nail, so as to solve the problem of the existing power battery being scrapped due to broken nails during assembly and the problem of the rubber nail falling into the battery during the vibration of the power battery during vehicle installation, causing short circuit and fire.

[0006] To achieve the above objectives, this utility model provides a safety tube structure for a power battery with rubber nails. The power battery includes a housing and a core disposed within the housing. The core has a central hole, and the safety tube is disposed corresponding to and inserted into the central hole. The safety tube includes a tube body with a first end and a second end opposite to the first end. The first end has an opening surrounding the rubber nail. The tube body also has a sieve hole portion with a plurality of safety through holes. The outer peripheral wall of the sieve hole portion is connected to the inner peripheral wall of the tube body so that the electrolyte entering the tube body passes through the sieve hole portion.

[0007] Preferably, the sieve hole portion is located at the second end of the tube body.

[0008] Preferably, the sieve hole portion is located in the middle of the tube body, and the second end of the tube body has an open structure.

[0009] Preferably, the safety through hole is a circular hole with a diameter greater than or equal to 0.5 mm and less than or equal to 1.5 mm, and the diameter of the circular hole is less than half the dimension in the thickness direction of the adhesive nail.

[0010] Preferably, the safety through hole is a rectangular hole with a width greater than or equal to 0.7 mm and less than or equal to 1.5 mm, and the width of the rectangular hole is less than half the dimension of the adhesive nail in the thickness direction.

[0011] Preferably, the first end has a guide angle.

[0012] Preferably, the tube body is further provided with a plurality of seepage holes, which extend from the outer surface of the tube body through the tube body to the interior of the tube body.

[0013] Preferably, the plurality of seepage holes include a plurality of first seepage holes and a plurality of second seepage holes. The plurality of first seepage holes are arranged sequentially along the length direction of the pipe body to form a first column of seepage holes, and the plurality of second seepage holes are arranged sequentially along the length direction of the pipe body to form a second column of seepage holes. The first column of seepage holes and the second column of seepage holes are arranged opposite to each other.

[0014] Preferably, the core is connected to a collector plate at the second end corresponding to the safety tube, and the collector plate has a central through hole in the middle, the inner diameter of which is smaller than the outer diameter of the safety tube.

[0015] Preferably, the safety tube is made of polypropylene.

[0016] Compared with the prior art, this utility model, by setting a safety tube in the central hole with the opening of the safety tube corresponding to the setting of the glue nail, ensures that the detached glue nail or part of the broken glue nail is retained in the safety tube and will not affect the core. This effectively improves the production yield of power batteries and avoids the risk of short circuit and fire caused by the glue nail falling off after the power battery is installed in the vehicle due to vibration. Attached Figure Description

[0017] Figure 1 This is a structural diagram of the safety tube at one angle in an embodiment of this utility model.

[0018] Figure 2 This is a cross-sectional view of the safety tube in an embodiment of this utility model.

[0019] Figure 3 This is a structural diagram of the safety tube from another angle in an embodiment of this utility model.

[0020] Figure 4 This is a structural diagram of the safety tube in another embodiment of the present invention.

[0021] Figure 5 This is a structural diagram of the adhesive nail in an embodiment of this utility model.

[0022] Figure 6 This is a structural diagram of the collector disk in an embodiment of this utility model.

[0023] Figure 7 This is a structural diagram of the power battery in an embodiment of this utility model.

[0024] Figure 8 This is a cross-sectional view of the power battery in an embodiment of this utility model.

[0025] Figure 9 for Figure 8 Enlarged view of point A in the middle.

[0026] Figure 10 for Figure 8 Enlarged view of point B in the middle. Detailed Implementation

[0027] To explain in detail the technical content, structural features, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0028] like Figures 1 to 10 As shown, this utility model embodiment provides a safety tube structure for a power battery with rubber nails. The power battery 10 includes a housing 4 and a core 5 disposed in the housing 4. The core 5 has a central hole 51. The safety tube 1 is disposed corresponding to the central hole 51 and inserted into the central hole 51. The safety tube 1 includes a tube body with a first end 11 and a second end 12 opposite to the first end 11. The first end 11 has an opening 111, which surrounds the rubber nail 2. The tube body is also provided with a sieve hole portion 13. The sieve hole portion 13 is provided with a plurality of safety through holes 131. The outer peripheral wall of the sieve hole portion 13 is connected to the inner peripheral wall of the tube body so that the electrolyte entering the tube body passes through the sieve hole portion 13. Specifically, the power battery 10 can be a cylindrical power battery. The top of the casing 4 is provided with a top cover, and the bottom shell 41 of the casing 4 is provided with an injection hole 411. The injection hole 411 is sealed by a rubber nail 2. The safety tube 1 is specifically a cylindrical structure. When the power battery 10 is assembled, if the rubber nail 2 breaks during the injection hole 411, a new rubber nail 2 can be directly replaced and re-inserted. The broken part of the rubber nail 2 falls from the opening 111 of the first end 11 into the safety tube 1 and is intercepted by the sieve hole part 13 to be permanently sealed in the safety tube 1. In addition, during the long-term vibration of the power battery 10 installed in the vehicle, after the rubber nail 2 falls off from the injection hole 411, it will not escape into the top cover and the core 5 or the bottom shell 41 and the core 5, but will remain in the safety tube 1. The design is very ingenious. Moreover, the sieve hole part 13 is provided with a safety through hole 131 to ensure the flow of electrolyte.

[0029] This utility model embodiment provides a safety tube 1 inside the central hole 51, with the opening 111 of the safety tube 1 corresponding to the adhesive nail 2. This ensures that any loose adhesive nail 2 or broken parts of the adhesive nail 2 remain in the safety tube 1 and do not affect the core 5. This effectively improves the production yield of the power battery 10 and avoids the risk of short circuit and fire caused by the adhesive nail 2 falling off after the power battery 10 is installed in the vehicle due to vibration.

[0030] In this embodiment of the utility model, such as Figures 1 to 2 As shown, the sieve hole portion 13 is located at the end of the second end 12 of the tube body. Specifically, the sieve hole portion 13 is located at the end of the second end 12 to facilitate the fabrication of the safety tube 1 and further ensure the flow of electrolyte. Of course, in some other specific embodiments of this utility model, the sieve hole portion 13 can also be located in the middle of the tube body, and the second end 12 of the tube body can be an open structure, which can also realize the function of the safety tube 1.

[0031] In this embodiment of the utility model, such as Figure 3 and Figure 5 As shown, the safety through hole 131 is a circular hole with a diameter greater than or equal to 0.5 mm and less than or equal to 1.5 mm. The diameter of the circular hole is less than half of the thickness dimension of the adhesive nail 2. Specifically, the diameter of the safety through hole 131 is the first diameter d1, and the thickness dimension of the adhesive nail 2 is the first thickness H. The size setting of the safety through hole 131 effectively ensures that the sieve hole part 13 will not affect the flow of electrolyte and can trap the adhesive nail 2.

[0032] In some other specific embodiments of this utility model, such as Figure 4 and Figure 5 As shown, the safety through hole 131 is a rectangular hole with a width W greater than or equal to 0.7 mm and less than or equal to 1.5 mm. The width W of the rectangular hole is less than half of the thickness dimension of the adhesive nail 2. Specifically, the thickness dimension of the adhesive nail 2 is the first thickness H. The size setting of the safety through hole 131 effectively ensures that the sieve hole part 13 will not affect the flow of electrolyte and can trap the adhesive nail 2.

[0033] In this embodiment of the invention, the first end 11 is provided with a guide angle 15. Specifically, as shown... Figure 8 as well as Figure 10 As shown, guide angles 15 are provided on both the inner and outer edges of the first end 11 to facilitate the installation of the safety tube 1 into the center hole 51 of the core 5.

[0034] In this embodiment of the utility model, such as Figures 1 to 2 As shown, the pipe body is also provided with several seepage holes 14, which extend from the outer surface of the pipe body through the pipe body to the interior of the pipe body. Specifically, the seepage holes 14 further ensure short injection time and high efficiency.

[0035] In this embodiment of the utility model, such as Figures 1 to 2 As shown, the plurality of seepage holes 14 include a plurality of first seepage holes and a plurality of second seepage holes. The plurality of first seepage holes are arranged sequentially along the length of the pipe body to form a first row of seepage holes 140a, and the plurality of second seepage holes are arranged sequentially along the length of the pipe body to form a second row of seepage holes 140b. The first row of seepage holes 140a and the second row of seepage holes 140b are arranged opposite to each other to ensure the uniformity of seepage in the pipe 1.

[0036] In this embodiment of the utility model, such as Figure 3 , Figure 6 ,as well as Figures 8 to 9 As shown, the core 5 is connected to the second end 12 of the safety tube 1 via a collector plate 3. The collector plate 3 has a central through hole 31 in its center. The inner diameter d2 of the central through hole 31 is smaller than the outer diameter D of the safety tube 1, thereby radially limiting the safety tube 1. Specifically, the collector plate here can be a negative collector plate.

[0037] In this embodiment of the invention, the safety tube 1 is made of polypropylene. Specifically, the safety tube 1 is integrally molded using polypropylene injection molding.

[0038] The assembly method of the power battery 10 in this embodiment of the utility model is as follows: Figures 1 to 10 As shown, firstly, insert the safety tube 1 into the center hole 51 of the core 5, with the second end 12, where the sieve hole part 13 is located, facing the top of the core 5; then, laser weld the full-pole tabs at both ends of the core 5 to the positive current collector 6 and the negative current collector respectively; then, place the core 5 into the housing 4, with the guide angle 15 of the first end 11 of the safety tube 1 assisting, and assemble the positive current collector 6 towards the bottom housing 41; then, use a clamp to hold the negative current collector, and perform a through weld to fix the positive current collector 6 to the bottom housing 41; then, weld the extension handle 32 of the negative current collector to the pole on the top cover, and seal the top cover opening with a weld; after liquid injection or liquid replenishment, insert the rubber nail 2. If a nail breaks, replace it with a new rubber nail 2 and re-insert it. The broken nail will fall into the safety tube 1 and be permanently sealed; finally, laser weld the metal sealing nail 7.

[0039] The above-disclosed examples are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent changes made in accordance with the scope of the present utility model application shall still fall within the scope of the present utility model.

Claims

1. A safety tube structure for a power battery, characterized in that, The power battery includes a housing and a core disposed within the housing. The core has a central hole. A safety tube is disposed corresponding to the central hole and inserted into the central hole. The safety tube includes a tube body with a first end and a second end opposite to the first end. The first end has an opening that surrounds the rubber nail. The tube body also has a sieve hole portion with a plurality of safety through holes. The outer peripheral wall of the sieve hole portion is connected to the inner peripheral wall of the tube body so that the electrolyte entering the tube body passes through the sieve hole portion.

2. The safety tube structure for a power battery as described in claim 1, characterized in that, The sieve section is located at the second end of the tube.

3. The safety tube structure for a power battery as described in claim 1, characterized in that, The sieve section is located in the middle of the tube body, and the second end of the tube body is an open structure.

4. The safety tube structure for a power battery as described in claim 1, characterized in that, The safety through hole is a circular hole with a diameter greater than or equal to 0.5 mm and less than or equal to 1.5 mm. The diameter of the circular hole is less than half the dimension of the adhesive nail in the thickness direction.

5. The safety tube structure for a power battery as described in claim 1, characterized in that, The safety through hole is a rectangular hole with a width greater than or equal to 0.7 mm and less than or equal to 1.5 mm. The width of the rectangular hole is less than half the dimension of the adhesive nail in the thickness direction.

6. The safety tube structure of the power battery with adhesive nails as described in claim 1, characterized in that, The first end has a guide angle.

7. The safety tube structure for a power battery as described in claim 1, characterized in that, The tube body is also provided with a number of seepage holes, which extend from the outer surface of the tube body through the tube body to the interior of the tube body.

8. The safety tube structure for a power battery as described in claim 7, characterized in that, The plurality of seepage holes include a plurality of first seepage holes and a plurality of second seepage holes. The plurality of first seepage holes are arranged sequentially along the length of the pipe body to form a first column of seepage holes, and the plurality of second seepage holes are arranged sequentially along the length of the pipe body to form a second column of seepage holes. The first column of seepage holes and the second column of seepage holes are arranged opposite to each other.

9. The safety tube structure for a power battery as described in claim 1, characterized in that, The core is connected to a collector plate at the second end corresponding to the safety tube. The collector plate has a central through hole in the middle, and the inner diameter of the central through hole is smaller than the outer diameter of the safety tube.

10. The safety tube structure for a power battery as described in claim 1, characterized in that, The safety tube is made of polypropylene.

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