Explosion-proof battery end cover

Abstract

The utility model relates to the technical field of battery structures, and discloses an explosion-proof battery end cover which comprises a pole and a sealing layer base, the top of the outer wall of the sealing layer base is fixedly connected with a plurality of sealing layer supporting columns, and the top of the outer wall of the sealing layer base is fixedly connected with a rubber base. The top of the outer wall of the rubber base is fixedly connected with a plurality of rubber inner supporting columns, the top of the outer wall of the rubber base is fixedly connected with a plurality of pieces of fluororubber, the tops of the outer walls of the sealing layer supporting columns are fixedly connected with a sealing layer, and the tops of the rubber inner supporting columns are fixedly connected with a rubber top seat. And the top of the fluororubber is fixedly connected with a rubber top seat. According to the utility model, the spring-like fluororubber structure is additionally arranged between the end cover and the battery, and when stress conflicts including external extrusion and internal pressure mutation occur, the spring-like fluororubber absorbs stress by virtue of elastic deformation, so that the shell and the end cover are prevented from being damaged due to stress concentration, and the risk of electrolyte leakage is further reduced to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of battery structure technology, and in particular to an explosion-proof battery end cap. Background Technology

[0002] A battery is a device that converts chemical energy into electrical energy through an internal chemical reaction. It consists of positive and negative electrode materials and an electrolyte. It can store and release electrical energy and is used in electronic devices, vehicles, and energy storage systems. As a core component of the modern energy system, the performance of the battery directly affects the device's range. The end cap, as an important component of the battery, plays a sealing and protective role. It is made of corrosion-resistant metals or composite materials to ensure the stability of the internal structure. The design of the end cap must take into account both conductivity and mechanical strength. Its manufacturing process and material selection play a decisive role in the safety and lifespan of the battery.

[0003] Traditional battery end caps, through specific structural designs and sealing materials, achieve a seal inside the battery, preventing external impurities such as moisture and air from entering and avoiding electrolyte leakage. This protects the electrode materials and electrolyte inside the battery, ensuring battery performance and safety. However, during long-term use, traditional battery end caps are subject to aging due to corrosion from internal chemical substances and external environmental factors. Aged sealing materials may crack, harden, and become brittle, leading to a decline in sealing performance and causing electrolyte leakage. This not only affects battery performance and lifespan but also causes corrosion damage to the surrounding environment and equipment.

[0004] Existing battery end caps employ a dual fixing structure with internal and external fixed connections. This prevents relative displacement between the cap and bottom cap during the flanging assembly process, strengthens the connection, increases the contact area, effectively reduces internal resistance, and improves conductivity. Furthermore, the use of better processes extends the lifespan of the end cap. However, in actual use, poor sealing can still lead to electrolyte leakage. Therefore, a new type of battery end cap is proposed to address these issues. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an explosion-proof battery end cap, which aims to improve the problem of electrolyte leakage caused by poor sealing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an explosion-proof battery end cap, comprising an electrode post and a sealing layer base, wherein a sealing layer support post is fixedly connected to the top of the outer wall of the sealing layer base, a rubber base is fixedly connected to the top of the outer wall of the sealing layer base, an inner rubber support post is fixedly connected to the top of the outer wall of the rubber base, fluororubber is fixedly connected to the top of the outer wall of the rubber base, a sealing layer is fixedly connected to the top of the outer wall of the sealing layer support post, a rubber top seat is fixedly connected to the top of the inner rubber support post, a rubber top seat is fixedly connected to the top of the fluororubber, a sealing layer is fixedly connected to the top of the outer wall of the rubber top seat, and an explosion-proof mechanism is provided on the outer wall of the electrode post to prevent the battery from rupturing.

[0007] As a further description of the above technical solution:

[0008] The explosion-proof mechanism includes an expansion ring base, the inner wall of which is fixedly connected to the outer wall of the pole, and the top of the outer wall of the sealing layer is fixedly connected to the expansion ring base. An outer groove is formed around the top of the outer wall of the expansion ring base, and a sealing cap is fixedly connected to the top of the outer groove. An inner groove is formed at the top of the outer wall of the expansion ring base, and a first expansion ring is fixedly connected to the top of the outer wall of the inner groove. A sealing cap is fixedly connected to the top of the outer wall of the first expansion ring.

[0009] As a further description of the above technical solution:

[0010] A diaphragm is fixedly connected to the outer wall of the electrode post, a shell is fixedly connected to the outer wall of the diaphragm, a fixing seat is fixedly connected to the top of the outer wall of the electrode post, and an electrode is fixedly connected to the top of the outer wall of the fixing seat.

[0011] As a further description of the above technical solution:

[0012] Heat sinks are fixedly connected to the outer wall of the casing.

[0013] As a further description of the above technical solution:

[0014] The outer wall of each heat sink is fixedly connected with multiple friction strips, which are arranged at equal intervals.

[0015] As a further description of the above technical solution:

[0016] A protective mark is fixedly connected to the upper part of the outer wall of the heat sink, and the protective mark is made of PP material.

[0017] As a further description of the above technical solution:

[0018] An indicator light is fixedly connected to the lower middle part of the outer wall of the heat sink, and the indicator light is electrically connected to the outer shell, the diaphragm and the electrode respectively.

[0019] As a further description of the above technical solution:

[0020] The outer wall of the sealing layer is fixedly connected with shock-absorbing rubber, and the surface of the shock-absorbing rubber is rounded.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, a spring-like fluororubber structure is added between the end cap and the battery. When stress conflict occurs, including external extrusion and internal pressure change, the spring-like fluororubber can absorb stress through elastic deformation. This avoids damage to the battery shell and end cap due to stress concentration, maintains the stability of the sealing structure, effectively buffers pressure changes, and thus reduces the risk of electrolyte leakage to a certain extent.

[0023] 2. In this utility model, the expansion ring surrounds the terminal post. When the internal temperature of the battery rises, the size of the expansion ring will change with the temperature. When the temperature rises to a predetermined value, the expansion ring will expand due to the decomposition of the internal inorganic foaming agent into gas, which physically cuts off the terminal post and forms an open circuit between the positive terminal post and the positive current collector, cutting off the battery's discharge circuit, thereby preventing safety accidents such as battery explosion due to overheating. Attached Figure Description

[0024] Figure 1 This is a perspective view of an explosion-proof battery end cap proposed in this utility model;

[0025] Figure 2 This is a schematic diagram of the outer shell of an explosion-proof battery end cap proposed in this utility model;

[0026] Figure 3 This is a cross-sectional view of the outer shell of an explosion-proof battery end cap proposed in this utility model;

[0027] Figure 4 This is an exploded view of the explosion-proof mechanism of an explosion-proof battery end cap proposed in this utility model;

[0028] Figure 5 This is a top view of the outer shell of an explosion-proof battery end cap proposed in this utility model.

[0029] Legend:

[0030] 1. Pole post; 2. Explosion-proof mechanism; 201. Expansion ring base; 202. Outer groove; 203. Inner groove; 204. First expansion ring; 205. Sealing cap; 3. Sealing layer support; 4. Rubber base; 5. Inner rubber support; 6. Fluororubber; 7. Sealing layer base; 8. Fixing seat; 9. Electrode; 10. Friction strip; 11. Shock-absorbing rubber; 12. Protective marking; 13. Indicator light; 14. Heat sink; 15. Housing; 16. Diaphragm; 17. Sealing colloid; 18. Rubber top seat. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 2 and Figure 4 This utility model provides an embodiment of an explosion-proof battery end cap, comprising a terminal post 1 and a sealing layer base 7. The terminal post 1 is used to connect to an external circuit to conduct current. A sealing layer support post 3 is fixedly connected to the top of the outer wall of the sealing layer base 7. A rubber base 4 is fixedly connected to the top of the outer wall of the sealing layer base 7. An inner rubber support post 5 is fixedly connected to the top of the outer wall of the rubber base 4. The rubber base 4 is used to fix fluororubber 6 and the inner rubber support post 5. The sealing layer base 7 is used to fix the rubber base 4 and the sealing layer support post 3. The sealing layer support post 3 is used to fixally connect a sealing gel 17. Fluororubber 6 is fixedly connected to the top of the outer wall of the base 4. Sealing material 17 is fixedly connected to the top of the outer wall of the sealing layer support 3. Rubber top seat 18 is fixedly connected to the top of the inner rubber support 5. The inner rubber support 5 provides a certain support for the fluororubber 6 itself, preventing it from excessively shifting and causing deformation that cannot be restored. Rubber top seat 18 is fixedly connected to the top of the fluororubber 6. Rubber top seat 18 is used to fix and connect the sealing material 17. Sealing material 17 is fixedly connected to the top of the outer wall of the rubber top seat 18. An explosion-proof mechanism 2 is provided on the outer wall of the pole post 1. The explosion-proof mechanism 2 is used to prevent the battery from cracking.

[0033] Specifically, the terminal 1 connects to the external circuit to conduct current. The sealing layer base 7 serves as the base of the entire sealing part. The sealing layer support 3 and the rubber base 4 support the structure of the entire sealing part. Fluororubber 6 prevents deformation of the sealing layer. The inner rubber support 5 stabilizes the shape of the fluororubber 6 and prevents excessive deformation. Fluororubber 6 and the inner rubber support 5 are sandwiched between the rubber base 4 and the rubber top seat 18. This structure stabilizes the interior of the sealing colloid 17, ensuring the sealing performance of the interior of the sealing colloid 17 and greatly reducing the problem of poor battery sealing. The sealing colloid 17 is used to seal the sealing layer. These structures constitute part of the entire sealing layer. The explosion-proof mechanism 2 is located above the sealing colloid to prevent the battery from breaking after impact.

[0034] Reference Figure 1 and Figure 4 The explosion-proof mechanism 2 includes an expansion ring base 201. The inner wall of the expansion ring base 201 is fixedly connected to the outer wall of the pole post 1. The top of the outer wall of the sealing colloid 17 is fixedly connected to the expansion ring base 201. An outer groove 202 is formed around the top of the outer wall of the expansion ring base 201. A sealing cover 205 is fixedly connected to the top of the outer groove 202. The outer groove 202 is connected to the sealing cover 205 using a tenon and mortise structure to improve the fit between the expansion ring base 201 and the sealing cover 205. An inner groove 203 is formed at the top of the outer wall of the expansion ring base 201. A first expansion ring 204 is fixedly connected to the top of the outer wall of the inner groove 203. The inner groove 203 and the first expansion ring 204 are nested to prevent them from shifting. The expansion ring base 201 is used to support the first expansion ring 204. A sealing cover 205 is fixedly connected to the top of the outer wall of the first expansion ring 204. The sealing cover 205 makes it tightly connected to the expansion ring base 201.

[0035] Specifically, the expansion ring base 201 supports the entire explosion-proof mechanism 2. The outer groove 202 on the expansion ring base 201 fits into the sealing cover 205, and the inner groove 203 on the expansion ring base 201 is nested and fixed with the first expansion ring 204 to prevent the first expansion ring 204 from shifting. The first expansion ring 204 is stuck in the terminal post 1 of the explosion-proof mechanism 2, covering the entire terminal post 1. The first expansion ring 204 is made of silicone with an inorganic foaming agent added inside. When the internal temperature of the battery is too high, the inorganic foaming agent will decompose into gas, causing the silicone to expand, thereby cutting off the terminal post 1 and stopping the continued electrochemical reaction inside the battery, preventing the possibility of an explosion. These structures constitute the entire explosion-proof mechanism 2, which is safe and reliable because it blocks the explosion through physical means.

[0036] Reference Figure 1 , Figure 3 and Figure 5A diaphragm 16 is fixedly connected to the outer wall of the terminal post 1, and a housing 15 is fixedly connected to the outer wall of the diaphragm 16. The diaphragm 16 is used to ensure the normal conduction of electrochemical reactions inside the battery. A mounting base 8 is fixedly connected to the top of the outer wall of the terminal post 1, and an electrode 9 is fixedly connected to the top of the outer wall of the mounting base 8. The mounting base 8 is used to connect the electrode 9, and the electrode 9 is used for discharge. A heat sink 14 is fixedly connected to the outer wall of the housing 15. The heat sink 14 is used to prevent the internal temperature of the battery from becoming too high. Multiple friction strips 10 are fixedly connected to the outer wall of the heat sink 14. The multiple friction strips 10 are arranged at equal intervals. The friction strips 10 are used to increase the battery's capacity. The surface friction facilitates handling. A protective mark 12 is fixedly connected to the upper part of the outer wall of the heat sink 14. The protective mark 12 is made of PP material and is used to warn that the battery should be handled with care. An indicator light 13 is fixedly connected to the lower part of the outer wall of the heat sink 14. The indicator light 13 is electrically connected to the outer shell 15, the separator 16 and the terminal 1 respectively. The indicator light 13 is used to indicate whether the battery is working normally. A shock-absorbing rubber 11 is fixedly connected to the outer wall of the sealing colloid 17. The surface of the shock-absorbing rubber 11 is rounded and is used to protect the battery to prevent it from being dropped and affecting its function.

[0037] Specifically, the separator 16 ensures the normal conduction of electrochemical reactions within the battery, guaranteeing its basic operation. The mounting base 8 ensures the correct positioning of the electrode 9, which is used for normal battery discharge. The heat sink 14 connected to the outer wall of the casing 15 releases heat from the battery in a timely manner, preventing overheating and potential problems. The friction strips 10 facilitate handling and transport of the battery, and their equidistant arrangement prevents excessive heat buildup. The protective markings 12 provide a good warning effect, reminding people to handle the battery with care, especially with gentle handling. The indicator light 13 displays whether the battery is functioning normally, helping to quickly troubleshoot whether the battery is malfunctioning. The shock-absorbing rubber 11 is nested on the outer wall of the sealing layer 17, protecting the battery surface and its structure in case of a drop, preventing excessive impact from causing internal battery problems.

[0038] Working principle: First, the sealing layer, based on the sealing layer base 7, has multiple support methods inside, with fluororubber 6 as the main support. The rubber base 4 clamps the fluororubber 6 and the inner rubber support column 5 to determine their positions. The inner rubber support column 5 can support the shape of the fluororubber 6 and assist the fluororubber 6 in supporting the structure. At the same time, multiple sealing layer support columns 3 reinforce the end cap structure. Specifically, this structure mainly reduces the risk of electrolyte leakage in two ways. One is in terms of stress buffering. Fluororubber 6 has good elasticity and buffering performance. When the battery is subjected to external impact, compression, or stress caused by internal pressure changes, the fluororubber 6 can absorb and disperse these stresses through compression and expansion, reducing the transmission to the outside of the battery. The interaction force between the shell 15 and the end cap reduces the risk of shell 15 cracking and end cap seal failure due to stress concentration, thereby reducing electrolyte leakage. Secondly, in terms of maintaining the seal, during the charging and discharging process of the battery, internal volume changes occur. The fluororubber 6 can adaptively adjust according to these volume changes. When the internal pressure of the battery increases, the fluororubber 6 is compressed, and the pressure on the end cap increases. However, due to the elasticity of the fluororubber 6, the end cap will not be excessively squeezed, resulting in seal damage. When the internal pressure decreases, the fluororubber 6 will push the end cap back to a certain position, maintaining the tightness of the seal and helping to prevent electrolyte leakage. This plays a double-layer protection role and reduces the problem of electrolyte leakage.

[0039] Furthermore, when a problem occurs inside the battery, an abnormal temperature rise can cause the battery to explode. The first expansion ring 204 at the top of the terminal 1 will expand. The first expansion ring 204 is made of silicone and contains an inorganic foaming agent. When the temperature is abnormal, the indicator light 13 will start flashing, and the inorganic foaming agent will decompose into gas, causing the first expansion ring 204 to expand. The first expansion ring 204 fixes the terminal 1. When the first expansion ring 204 expands, it will cause the terminal 1 to be cut off, preventing the electrochemical reaction inside the battery from continuing and avoiding battery rupture.

[0040] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An explosion-proof battery end cap, comprising an electrode post (1) and a sealing layer base (7), characterized in that: A sealing layer support column (3) is fixedly connected to the top of the outer wall of the sealing layer base (7). A rubber base (4) is fixedly connected to the top of the outer wall of the sealing layer base (7). A rubber inner support column (5) is fixedly connected to the top of the outer wall of the rubber base (4). Fluororubber (6) is fixedly connected to the top of the outer wall of the rubber base (4). A sealing colloid (17) is fixedly connected to the top of the outer wall of the sealing layer support column (3). A rubber top seat (18) is fixedly connected to the top of the rubber inner support column (5). A rubber top seat (18) is fixedly connected to the top of the fluororubber (6). A sealing colloid (17) is fixedly connected to the top of the outer wall of the rubber top seat (18). An explosion-proof mechanism (2) is provided on the outer wall of the pole post (1). The explosion-proof mechanism (2) is used to prevent the battery from cracking.

2. The explosion-proof battery end cap according to claim 1, characterized in that: The explosion-proof mechanism (2) includes an expansion ring base (201). The inner wall of the expansion ring base (201) is fixedly connected to the outer wall of the pole (1). The top of the outer wall of the sealing colloid (17) is fixedly connected to the expansion ring base (201). An outer groove (202) is formed around the top of the outer wall of the expansion ring base (201). A sealing cap (205) is fixedly connected to the top of the outer groove (202). An inner groove (203) is formed at the top of the outer wall of the expansion ring base (201). A first expansion ring (204) is fixedly connected to the top of the outer wall of the inner groove (203). A sealing cap (205) is fixedly connected to the top of the outer wall of the first expansion ring (204).

3. The explosion-proof battery end cap according to claim 1, characterized in that: A diaphragm (16) is fixedly connected to the outer wall of the pole post (1), a shell (15) is fixedly connected to the outer wall of the diaphragm (16), a fixing seat (8) is fixedly connected to the top of the outer wall of the pole post (1), and an electrode (9) is fixedly connected to the top of the outer wall of the fixing seat (8).

4. The explosion-proof battery end cap according to claim 3, characterized in that: The outer wall of the outer casing (15) is fixedly connected to a heat sink (14).

5. The explosion-proof battery end cap according to claim 4, characterized in that: The outer wall of each heat sink (14) is fixedly connected with a plurality of friction strips (10), and the plurality of friction strips (10) are arranged at equal intervals.

6. The explosion-proof battery end cap according to claim 4, characterized in that: A protective sign (12) is fixedly connected to the upper part of the outer wall of the heat sink (14), and the protective sign (12) is made of PP material.

7. The explosion-proof battery end cap according to claim 4, characterized in that: An indicator light (13) is fixedly connected to the lower middle part of the outer wall of the heat sink (14). The indicator light (13) is electrically connected to the outer shell (15), the diaphragm (16) and the pole (1).

8. The explosion-proof battery end cap according to claim 1, characterized in that: The outer wall of the sealing colloid (17) is fixedly connected to a shock-absorbing rubber (11), and the surface of the shock-absorbing rubber (11) is rounded.

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