Leakage-proof battery end cover sealing structure
By employing a connection method combining telescopic rods and springs with a combination of sealing grooves, sealing strips, and sealant in lithium-ion batteries, the problem of easy breakage at the weld between the battery end cap and the battery casing is solved, achieving higher sealing performance and connection stability, extending the service life of lithium-ion batteries, and improving working efficiency.
Patent Information
- Application Number
- CN202510756659.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-09
- Publication Date
- 2025-10-21
AI Technical Summary
The weld between the end cap and the battery casing of traditional lithium-ion batteries is prone to breakage, which leads to a decrease in sealing performance and affects the working efficiency and lifespan of lithium-ion batteries.
Two methods are used to jointly fix the end cap body and the battery housing: the initial connection is achieved through the cooperation of telescopic rod and spring, followed by multi-point welding, and sealing grooves and sealing strips are set at the connection to enhance the sealing performance. Finally, the sealing effect is further improved by injecting sealant and threaded connection of the knob.
It improves the connection stability and sealing between the end cap and the battery casing, prevents leakage, extends the service life of lithium-ion batteries, and improves working efficiency.
Smart Images
Figure CN120824481A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of power batteries, and in particular to a leakage-proof battery end cover sealing structure. Background Art
[0002] At present, with the increasing maturity of lithium-ion battery technology, lithium-ion batteries have been widely used as power batteries in the field of electric vehicles. Therefore, people's requirements for the safety performance of lithium-ion batteries are increasing.
[0003] In traditional lithium-ion battery structures, the battery end cap and the battery shell are often connected by multi-point welding. However, over time or when used in a bumpy environment, the welds between the battery end cap and the battery shell are prone to breakage, thereby affecting the sealing of the lithium-ion battery, causing the lithium-ion battery to leak easily, seriously affecting the working efficiency and service life of the lithium-ion battery.
[0004] Therefore, a leakage-proof battery end cover sealing structure is proposed. Summary of the Invention
[0005] The present invention aims to provide a battery end cover sealing structure that prevents liquid leakage.
[0006] To achieve the above object, the present invention provides the following technical solutions: A leak-proof battery end cap sealing structure, comprising: An end cap body welded to the top of the battery housing; A first sealing groove is formed on the top of the battery housing, and a first sealing strip is installed inside the end cover body and is located inside the first sealing groove; The front and rear ends of the end cover body are both provided with connection grooves; The left and right inner walls of the connecting groove are both provided with connecting holes, a telescopic rod is fixed to the inner wall of the connecting hole, and a connecting block is fixed to one end of the telescopic rod; The outer wall of the telescopic rod is provided with a spring; One end of the spring is fixed to the inner wall of the connecting hole, and the other end of the spring is fixed to the connecting block; The front and rear ends of the battery housing are both fixed with fixing blocks that abut against the two connecting blocks.
[0007] Preferably, the outer wall of the battery housing is provided with a first slot, the inner wall of the end cover body is provided with a second slot matching the first slot, and the outer wall of the end cover body is provided with a sealant injection port communicating with the second slot.
[0008] Preferably, a sealing member is provided in the sealant injection port.
[0009] Preferably, the sealing member is composed of a sealing column and a knob, and the knob is fixed at one end of the sealing column.
[0010] Preferably, the outer wall of the sealing column is provided with an external thread, the inner wall of the sealant injection port is provided with an internal thread, and the sealing column is threadedly connected to the inside of the sealant injection port through the external thread and the internal thread.
[0011] Preferably, the outer wall of the battery housing is provided with a second sealing groove and a third sealing groove, and a second sealing strip and a third sealing strip are installed in the second sealing groove and the third sealing groove respectively.
[0012] Preferably, the second sealing strip and the third sealing strip are respectively arranged on the upper and lower sides of the first empty groove and the second empty groove.
[0013] Compared with the prior art, the present invention has the following beneficial effects: When the end cover body is installed, the end cover body is first sleeved onto the top of the battery shell. At this time, the end cover body will move downward, the two connecting blocks will be squeezed by the fixed block, and the telescopic rod and the spring in the connecting hole of the connecting groove will contract. When the fixed block passes through the two connecting blocks, the telescopic rod will be driven to stretch under the action of the spring. The telescopic rod drives the connecting block to move during the stretching movement. At this time, the two connecting blocks will move close to each other. After the two connecting blocks abut against the fixed block, the end cover body and the battery shell can be connected and fixed, and then the end cover body and the battery shell can be multi-point welded. Compared with the existing method, the present invention adopts two methods to jointly connect and fix the end cover body and the battery shell, so that the connection stability of the end cover body and the battery shell is better, the sealing of the end cover body and the battery shell is improved, leakage of the lithium ion battery is avoided, and the service life and working efficiency of the lithium ion battery are improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 For the present invention Figure 1 Schematic diagram of the enlarged structure of A in the middle; Figure 3 Schematic diagram of the battery housing structure in the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure of B; Figure 5 Schematic diagram of the end cover body structure in the present invention; Figure 6 It is a partial cross-sectional structural schematic diagram of the present invention.
[0015] In the figure: 1. battery case; 2. end cover body; 3. connecting groove; 4. connecting hole; 5. telescopic rod; 6. connecting block; 7. spring; 8. fixing block; 9. first sealing groove; 10. first sealing strip; 11. first empty groove; 12. second empty groove; 13. sealant injection port; 14. sealing column; 15. knob; 16. second sealing groove; 17. second sealing strip; 18. third sealing groove; 19. third sealing strip. DETAILED DESCRIPTION
[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0017] In order to better understand the above technical solution, the above technical solution will be described in detail below with reference to the accompanying drawings and specific implementation methods.
[0018] Example 1
[0019] See also Figure 1-3 , 5, 6, the present invention provides a technical solution: In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a leakage-proof battery end cover sealing structure, comprising: an end cover body 2 welded to the top of a battery shell 1; a first sealing groove 9 is provided on the top of the battery shell 1, and a first sealing strip 10 located inside the first sealing groove 9 is installed inside the end cover body 2; connecting grooves 3 are provided at the front and rear ends of the end cover body 2; connecting holes 4 are provided on the left and right inner walls of the connecting groove 3, a telescopic rod 5 is fixed on the inner wall of the connecting hole 4, and a connecting block 6 is fixed at one end of the telescopic rod 5; a spring 7 is provided on the outer wall of the telescopic rod 5; one end of the spring 7 is fixed to the inner wall of the connecting hole 4, and the other end of the spring 7 is fixed to the connecting block 6; fixing blocks 8 abutting against the two connecting blocks 6 are fixed at the front and rear ends of the battery shell 1.
[0020] When the battery pack 1 is in a state of being pressed down, the battery pack 1 is tightened and the screw thread 7 is tightened, so that the battery pack 1 is tightened and the screw thread 7 is tightened. Since a first sealing groove 9 is opened on the top of the battery shell 1, a first sealing strip 10 located inside the first sealing groove 9 is installed inside the end cover body 2. With the cooperation of the first sealing groove 9 and the first sealing strip 10, the sealing and connection stability of the end cover body 2 and the battery shell 1 can be improved.
[0021] Example 2
[0022] See also Figure 3-6 The present invention provides a technical solution: a leakage-proof battery end cover sealing structure, wherein a first hollow groove 11 is formed on the outer wall of the battery shell 1, and a second hollow groove 12 is formed on the inner wall of the end cover body 2 to match the first hollow groove 11, and a sealant injection port 13 is formed on the outer wall of the end cover body 2 to communicate with the second hollow groove 12, and a sealing member is arranged in the sealant injection port 13, and the sealing member is composed of a sealing column 14 and a knob 15, and the knob 15 is fixed to one end of the sealing column 14, and the outer wall of the sealing column 14 is provided with an external thread, and the inner wall of the sealant injection port 13 is provided with an internal thread, and the sealing column 14 is threadedly connected to the inside of the sealant injection port 13 through the external thread and the internal thread, and the outer wall of the battery shell 1 is respectively provided with a second sealing groove 16 and a third sealing groove 18, and a second sealing strip 17 and a third sealing strip 19 are respectively installed in the second sealing groove 16 and the third sealing groove 18, and the second sealing strip 17 and the third sealing strip 19 are respectively arranged on the upper and lower sides of the first hollow groove 11 and the second hollow groove 12.
[0023] Specifically, the sealant is injected into the first and second slots 11 and 12 through the sealant injection port 13, and then the sealing column 14 is connected to the sealant injection port 13 by using the knob 15 with the cooperation of the internal and external threads. After the sealant is formed, the connection between the end cap body 2 and the battery housing 1 can be sealed, thereby further improving the sealing performance and connection stability of the end cap body 2 and the battery housing 1. Since the outer wall of the battery housing 1 is respectively provided with a second sealing groove 16 and a third sealing groove 18, a second sealing strip 17 and a third sealing strip 19 are respectively installed in the second sealing groove 16 and the third sealing groove 18, and the second sealing strip 17 and the third sealing strip 19 are respectively arranged on the upper and lower sides of the first empty groove 11 and the second empty groove 12. With the cooperation of the second sealing groove 16, the second sealing strip 17 and the third sealing groove 18, the third sealing strip 19, on the one hand, can avoid overflow of the sealant, thereby improving the sealing effect of the sealant, and on the other hand, further improve the sealing performance and connection stability of the end cover body 2 and the battery housing 1.
[0024] Working principle: When installing the end cover body 2, first put the end cover body 2 onto the top of the battery shell 1. At this time, the end cover body 2 will move downward, and the two connecting blocks 6 will be squeezed by the fixed block 8. The telescopic rod 5 and the spring 7 in the connecting hole 4 of the connecting groove 3 will contract. After the fixed block 8 passes through the two connecting blocks 6, the telescopic rod 5 will be driven to stretch under the action of the spring 7. The telescopic rod 5 drives the connecting block 6 to move during the stretching movement. At this time, the two connecting blocks 6 will move close to each other. After the two connecting blocks 6 abut against the fixed block 8, the end cover body 2 and the battery shell 1 can be connected and fixed, and then the end cover body 2 and the battery shell 1 can be multi-point welded. Since a first sealing groove 9 is provided at the top of the battery shell 1, a first sealing strip 10 located inside the first sealing groove 9 is installed inside the end cover body 2. With the cooperation of the first sealing groove 9 and the first sealing strip 10, the sealing and connection stability of the end cover body 2 and the battery shell 1 can be improved. The sealant is injected into the sealant through the sealant. The sealing plug 14 is connected to the sealing plug 13 by the inner thread and the outer thread of the knob 15. After the sealing plug is formed, the connection between the end cover body 2 and the battery shell 1 can be sealed, thereby further improving the sealing performance and connection stability of the end cover body 2 and the battery shell 1. Since the outer wall of the battery shell 1 is respectively provided with a second sealing groove 16 and a third sealing groove 18, a second sealing strip 17 and a third sealing strip 19 are respectively installed in the second sealing groove 16 and the third sealing groove 18. The second sealing strip 17 and the third sealing strip 19 are respectively arranged on the upper and lower sides of the first empty groove 11 and the second empty groove 12. With the cooperation of the second sealing groove 16, the second sealing strip 17 and the third sealing groove 18 and the third sealing strip 19, on the one hand, the sealant can be prevented from overflowing, thereby improving the sealing effect of the sealant. On the other hand, the sealant can be further improved. The sealing performance and connection stability of the end cover body 2 and the battery shell 1.
[0025] In the description of the present invention, it should be understood that the terms "center", "front", "back", "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 the present invention and simplifying the description, rather than indicating or implying 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 limiting the scope of protection of the present invention.
[0026] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.
Claims
1. A leak-proof battery end cap sealing structure, characterized in that: include: An end cover body (2) welded to the top of the battery housing (1); A first sealing groove (9) is provided on the top of the battery housing (1), and a first sealing strip (10) located inside the first sealing groove (9) is installed inside the end cover body (2); The front and rear ends of the end cover body (2) are both provided with connection grooves (3); The left and right inner walls of the connecting groove (3) are both provided with connecting holes (4), a telescopic rod (5) is fixed to the inner wall of the connecting hole (4), and a connecting block (6) is fixed to one end of the telescopic rod (5); The outer wall of the telescopic rod (5) is provided with a spring (7); One end of the spring (7) is fixed to the inner wall of the connecting hole (4), and the other end of the spring (7) is fixed to the connecting block (6); The front and rear ends of the battery housing (1) are both fixed with fixing blocks (8) that abut against the two connecting blocks (6).
2. A leak-proof battery end cap sealing structure according to claim 1, characterized in that: The outer wall of the battery housing (1) is provided with a first slot (11), the inner wall of the end cover body (2) is provided with a second slot (12) that matches the first slot (11), and the outer wall of the end cover body (2) is provided with a sealant injection port (13) that communicates with the second slot (12).
3. A leak-proof battery end cap sealing structure according to claim 2, characterized in that: A sealing member is provided in the sealant injection port (13).
4. A leak-proof battery end cap sealing structure according to claim 3, characterized in that: The sealing member is composed of a sealing column (14) and a knob (15), and the knob (15) is fixed on one end of the sealing column (14).
5. The leak-proof battery end cap sealing structure according to claim 4, characterized in that: The outer wall of the sealing column (14) is provided with an external thread, and the inner wall of the sealant injection port (13) is provided with an internal thread. The sealing column (14) is threadedly connected to the inside of the sealant injection port (13) through the external thread and the internal thread.
6. The battery end cap sealing structure for preventing leakage according to claim 1, characterized in that: The outer wall of the battery housing (1) is respectively provided with a second sealing groove (16) and a third sealing groove (18), and a second sealing strip (17) and a third sealing strip (19) are respectively installed in the second sealing groove (16) and the third sealing groove (18).
7. A leak-proof battery end cap sealing structure according to claim 6, characterized in that: The second sealing strip (17) and the third sealing strip (19) are respectively arranged on the upper and lower sides of the first empty groove (11) and the second empty groove (12).