Single battery
By designing a housing with a through hole and a first mounting groove, as well as a seal and a seal ring with a flange and a limiting portion, a first gap in communication with the external space is formed, and the problem of electrolyte overflow and residue during the battery sealing process is solved, and the accuracy of battery sealing detection is achieved.
Patent Information
- Application Number
- CN202420558937.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-21
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-03-21
AI Technical Summary
During the battery sealing process, the electrolyte overflows and remains in the gap between the sealing structure and the injection hole, resulting in misjudgment of the sealing detection results and affecting the battery's factory pass rate.
A single cell is designed, and its outer shell has a through hole and a first mounting groove. The seal is fixed to the outer shell through the flange and the limiting part. The sealing ring is located between the flange and the first step surface, forming a first gap and communicating with the external space to ensure that the electrolyte or helium can evaporate.
By connecting the first gap with the external space, the electrolyte or helium can evaporate effectively, avoiding the mis-detecting of the through-holes, and ensuring the accuracy of the sealing detection of single-cell batteries.
Smart Images
Figure CN222601330U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a single cell. Background Art
[0002] The battery's filling holes need to be sealed with a sealing structure after the filling is completed. During the sealing process, electrolyte will overflow from the filling hole, and the overflowed electrolyte will remain in the gap between the sealing structure and the filling hole. During the battery sealing test, if the overflowed electrolyte cannot be cleared, it will cause misjudgment of the test results and affect the battery's factory qualification rate. Utility Model Content
[0003] The purpose of the present application is to provide a single cell that is conducive to the volatilization of the fluid retained in the gap.
[0004] To achieve the above-mentioned purpose, the present application provides a single battery, which includes: a shell, the shell having a accommodating cavity, a cavity wall of the accommodating cavity including a first surface and a second surface arranged oppositely, the second surface being located in the accommodating cavity, the shell being provided with a through hole penetrating the cavity wall in a direction perpendicular to the first surface, the shell being further provided with a first mounting groove, the first mounting groove intersecting with the through hole and forming a first step surface at the intersection; a sealing member, one end of the sealing member being provided with a flange, the other end of the sealing member being provided with a limiting portion, the flange being pressed against the shell and being located on the first surface, the other end of the sealing member passing through the through hole, the limiting portion being clamped on the second surface and cooperating with the flange to fix the sealing member on the shell; and a sealing ring, the sealing ring being sleeved on the sealing member and supported between the flange and the first step surface, a first gap being provided between the outer annular surface of the sealing ring and the side wall of the first mounting groove in the radial direction of the through hole, the first gap being communicated with the external space of the shell.
[0005] Compared with the prior art, the above technical solution has the following advantages:
[0006] The first gap is connected to the external space of the shell, so that the electrolyte or helium in the space from the shell to the sealing ring can flow from the first gap to the external space, and even the electrolyte or helium remaining in the first gap can be effectively volatilized, thereby avoiding the occurrence of erroneous detection of poor sealing of the through hole due to the electrolyte or helium remaining in the first gap, that is, ensuring the accuracy of the sealing detection of the single cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] The following drawings are only intended to illustrate and explain the present application, and do not limit the scope of the present application.
[0008] Figure 1is a structural schematic diagram of a first embodiment of a single cell described in the present application;
[0009] Figure 2 yes Figure 1 A schematic cross-sectional view of a single cell shown;
[0010] Figure 3 yes Figure 2 A schematic diagram of a partial structure of the side view of the structure shown;
[0011] Figure 4 yes Figure 1 A schematic diagram of the top view of the single cell shown;
[0012] Figure 5 yes Figure 4 A schematic diagram of a partial structure of a single cell shown;
[0013] Figure 6 yes Figure 5 A schematic diagram of the enlarged structure of the middle part A;
[0014] Figure 7 is a partial cross-sectional structural schematic diagram of a second embodiment of a single cell described in the present application;
[0015] Figure 8 is a partial cross-sectional structural schematic diagram of a third embodiment of a single cell described in the present application;
[0016] Fig. 9 is a partial cross-sectional structural schematic diagram of a fourth embodiment of a single cell described in the present application;
[0017] Fig.10 It is a partial cross-sectional structural schematic diagram of the fifth embodiment of the single cell described in the present application.
[0018] Description of Figure Numbers:
[0019] 101. Shell;
[0020] 10. Shell;
[0021] 20, cover plate; 211, through hole; 212, first mounting groove; 213, second mounting groove; 22, first surface; 23, second surface; 24, first step surface; 25, second step surface; 26, first groove;
[0022] 30. sealing member; 31. flange; 32. limiting portion; 33. second groove;
[0023] 40. Sealing ring;
[0024] 50. First gap;
[0025] 60. Channel;
[0026] 70. Second gap;
[0027] 80. Explosion-proof valve;
[0028] 100. Center line. DETAILED DESCRIPTION
[0029] The present application is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present application will become clearer and more specific.
[0030] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.
[0031] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The following discussion provides multiple embodiments of the present application. Although each embodiment represents a single combination of the application, different embodiments of the present application can be replaced or combined, so the present application can also be considered to include all possible combinations of the same and / or different embodiments recorded. Therefore, if one embodiment includes A, B, C, and another embodiment includes a combination of B and D, then the present application should also be considered to include an embodiment containing one or more of all other possible combinations of A, B, C, D, although the embodiment may not be clearly recorded in the following text. In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0032] like Figures 1 to 10 As shown, the single cell provided in the present application includes: a housing 101 , a sealing member 30 and a sealing ring 40 .
[0033] The shell 101 has a accommodating cavity, and a cavity wall of the accommodating cavity includes a first surface 22 and a second surface 23 that are arranged opposite to each other. The second surface 23 is located in the accommodating cavity. In a direction perpendicular to the first surface 22, a through hole 211 penetrating the cavity wall is provided on the shell 101. A first mounting groove 212 is also provided on the shell 101. The first mounting groove 212 intersects with the through hole 211 and forms a first step surface 24 at the intersection.
[0034] A flange 31 is provided at one end of the seal 30, and a limiting portion 32 is provided at the other end of the seal 30. The flange 31 is pressed against the shell 101 and is located on the first surface 22. The other end of the seal 30 passes through the through hole 211, and the limiting portion 32 is clamped on the second surface 23 and cooperates with the flange 31 to fix the seal 30 on the shell 101.
[0035] The sealing ring 40 is sleeved on the sealing member 30 and supported between the flange 31 and the first step surface 24 . In the radial direction of the through hole 211 , there is a first gap 50 between the outer annular surface of the sealing ring 40 and the side wall of the first mounting groove 212 . The first gap 50 is connected to the external space of the housing 101 .
[0036] After the various parts of the single cell are assembled, it is necessary to inject electrolyte into the interior of the single cell through the through hole. After the injection is completed, the through hole needs to be sealed by a seal. The sealing operation is specifically as follows: fix the flange of the seal, and then pull the core pull connected to the seal. Due to the interference between the core pull and the seal, the core pull will squeeze the seal in the radial direction, causing the seal to expand in the radial direction and increase in size to form a limit portion. When the core pull is pulled to a certain extent, the core pull can be broken at the weak part, so that the seal is fixed on the shell and the through hole is sealed to form the final single cell. In the above process, electrolyte will overflow from the through hole. If part of the overflowed electrolyte cannot be removed, it will cause misjudgment of the test result during the sealing test of the single cell, affecting the factory qualified rate of the single cell. In addition, if helium remains in the first gap, it will also cause misjudgment of the test result, affecting the factory qualified rate of the single cell.
[0037] In the single cell provided in the present application, the first gap 50 is connected to the external space of the shell 101, so that the electrolyte or helium in the space from the shell 101 to the sealing ring 40 can flow from the first gap 50 to the external space, and even the electrolyte or helium remaining in the through hole 211 can be effectively volatilized, thereby avoiding the occurrence of erroneous detection of poor sealing of the through hole 211 due to the electrolyte or helium remaining in the through hole 211, that is, ensuring the accuracy of the sealing detection of the single cell.
[0038] like Figure 3 As shown, in one embodiment of the present application, in the radial direction of the through hole 211 , the width L of the first gap 50 is 0.05 mm to 0.7 mm.
[0039] If the width of the first gap 50 is greater than 0.7 mm, the first gap 50 is too large, resulting in the first gap 50 being able to accommodate more fluid (fluid including electrolyte and helium), and more fluid is not easy to volatilize, even if the fluid in the first gap 50 cannot be effectively volatilized; if the width of the first gap 50 is less than 0.05 mm, the flow area of the first gap 50 is small, which affects the volatilization of the fluid therein, so that the fluid in the first gap 50 cannot be effectively volatilized; therefore, the size of the first gap 50 is within the above range, so that the electrolyte or helium in the first gap 50 can flow out quickly, even if the electrolyte or helium remaining in the first gap 50 can be quickly and effectively volatilized, thereby avoiding the occurrence of erroneous detection of poor sealing of the through hole 211 due to the electrolyte or helium remaining in the first gap 50, that is, ensuring the accuracy of the single cell sealing detection.
[0040] like Figure 1 and Figure 2 As shown, in one embodiment of the present application, the housing 101 includes a cover plate 20 and a shell 10 .
[0041] The housing 10 has a cavity with an opening at one end. The cover plate 20 is disposed on the housing 10 and seals the opening to form a receiving cavity.
[0042] The cover plate 20 has a first surface 22 and a second surface 23 .
[0043] In the above structure, the through hole 211 is arranged on the cover plate 20, that is, the injection hole of the single cell is arranged on the cover plate 20. On the one hand, the electrolyte injection operation can be carried out more easily to improve production efficiency. On the other hand, the cover plate 20 is usually the top of the single cell. Setting the injection hole here can make it easier to achieve sealing and reduce the risk of electrolyte leakage. On the other hand, some gas may be generated when the electrolyte is injected. Placing the injection hole on the top plate is conducive to the discharge of gas and balances the pressure inside the battery.
[0044] Several embodiments of connecting the first gap with the external space will be described in detail below with reference to the accompanying drawings.
[0045] Embodiment 1
[0046] like Figures 1 to 3 As shown, a second mounting groove 213 is also provided on the housing 101 , and the second mounting groove 213 intersects with the first mounting groove 212 to form a second step surface 25 at the intersection, the flange 31 is pressed against the second step surface 25 , and at least part of the flange 31 is located in the second mounting groove 213 .
[0047] A second gap 70 is provided between the flange 31 and the side wall of the second mounting groove 213, the second gap 70 is communicated with the external space of the housing 101, and the first gap 50 is communicated with the second gap 70. Specifically, a first groove 26 is provided on the second step surface 25, the first groove 26 and the flange 31 form a channel 60, and the channel communicates the first gap 50 with the second gap 70.
[0048] During the product production process, due to processing errors, there are some differences in the size of each seal 30, that is, there are some differences in the size of the flanges 31 on different seals 30. The setting of the second gap 70 makes the cooperation between the flange 31 and the second mounting groove a gap configuration, thereby ensuring that the flange 31 can smoothly enter the second mounting groove.
[0049] In addition, the first groove 26 and the flange 31 form a channel 60 connecting the first gap 50 and the second gap 70. The channel 60 is arranged on the shell 101. While ensuring the strength requirements of the shell 101, the flange 31 is ensured to have high mechanical strength, and the probability of damage to the flange 31 is reduced, thereby ensuring the reliability of the connection between the flange 31 and the shell 101.
[0050] like Figure 3 As shown, in one embodiment of the present application, in the axial direction of the through hole 211 , the depth H of the first groove 26 is 0.1 mm to 0.7 mm.
[0051] If the depth of the first groove 26 is less than 0.1 mm, the depth of the first groove 26 is too small, resulting in a small flow area of the channel 60, which affects the flow rate of the fluid (the fluid includes electrolyte and helium) passing through it, so that the fluid in the space from the shell 101 to the sealing ring 40 cannot be effectively volatilized; if the depth of the first groove 26 is greater than 0.7 mm, the depth of the first groove 26 is too large to affect the mechanical strength of the shell 101; therefore, the size of the first groove 26 is within the above range, and under the condition of ensuring the use strength requirements of the shell 101, the size of the channel 60 formed by the first groove 26 and the flange 31 is within a reasonable range, so that the electrolyte or helium in the space from the shell 101 to the sealing ring 40 can flow out quickly from the channel 60, even if the electrolyte or helium remaining in the through hole 211 can be quickly and effectively volatilized, thereby avoiding the occurrence of erroneous detection of poor sealing of the through hole 211 due to the electrolyte or helium remaining in the through hole 211, that is, ensuring the accuracy of the single cell sealing detection.
[0052] like Figures 4 to 6 As shown, in one embodiment of the present application, in the circumferential direction of the through hole 211 , the width D of the first groove 26 is 5% to 10% of the circumferential length of the first step surface 24 in the width direction of the first groove 26 .
[0053] If the ratio of the width of the first groove 26 to the circumferential length of the first step surface 24 is less than 5%, the width of the first groove 26 is too small, resulting in a small flow area of the channel 60, which affects the flow rate of the fluid (fluid including electrolyte and helium) passing therethrough, and the fluid in the space from the housing 101 to the sealing ring 40 cannot be effectively volatilized; if the ratio of the width of the first groove 26 to the circumferential length of the first step surface 24 is greater than 10%, the width of the first groove 26 is too large, which affects the mechanical strength of the housing 101; therefore, the size of the first groove 26 is within the above range, and within While ensuring the strength requirement of the housing 101, the size of the channel 60 formed by the first groove 26 and the flange 31 is within a reasonable range, so that the electrolyte or helium in the space from the housing 101 to the sealing ring 40 can flow out quickly from the channel 60, and even the electrolyte or helium remaining in the first gap 50 can evaporate quickly and effectively, thereby avoiding the situation where the through hole 211 is incorrectly detected to be not sealed due to the electrolyte or helium remaining in the first gap 50, that is, ensuring the accuracy of the single cell sealing detection.
[0054] like Figure 5 and Figure 6 As shown, in one embodiment of the present application, the first surface 22 is symmetrical about a center line 100 on the first surface 22 , and the extension direction of the center line 100 is the length direction of the housing 101 .
[0055] The first groove 26 includes a groove opening and a groove bottom which are arranged opposite to each other, and the groove opening is arranged on the second step surface 25 .
[0056] The plane where the first surface 22 is located is a projection plane, and the projection of the bottom of the first groove 26 on the projection plane does not overlap with the center line 100. That is, the first groove 26 is not arranged on the center line 100.
[0057] If the first groove 26 is set on the center line 100, this will reduce the strength of the shell 101 at the center line 100. Since the explosion-proof valve 80 is set on the center line 100 of the first surface 22, the strength of the shell 101 at the center line 100 is further reduced. This will cause the explosion-proof valve 80 to work in advance to relieve the pressure of the single cell before the internal pressure of the single cell reaches the set pressure. Therefore, the first groove 26 is not set on the center line 100 to ensure the normal operation of the explosion-proof valve 80.
[0058] Embodiment 2
[0059] like Figure 7 As shown, the second embodiment is substantially the same as the first embodiment, and its distinguishing technical features compared with the first embodiment are: a channel 60 is provided on the housing 101, and two ports of the channel 60 are respectively provided on the second step surface 25 and the side wall of the first mounting groove 212, and the channel 60 connects the first gap 50 and the second gap 70.
[0060] The channel 60 passes through the second step surface 25 to connect the first gap 50 with the second gap 70. Since the channel 60 is arranged on the outer shell 101, the flange 31 is ensured to have a high mechanical strength while ensuring the strength requirements of the outer shell 101, and the probability of damage to the flange 31 is reduced, thereby ensuring the reliability of the connection between the flange 31 and the outer shell 101.
[0061] Embodiment 3
[0062] like Figure 8 As shown, the third embodiment is substantially the same as the first embodiment, and its distinguishing technical feature compared with the first embodiment is that a second groove 33 is provided on the surface of the flange 31 in contact with the second step surface 25, and the second groove 33 and the second step surface 25 form a channel 60, and the channel 60 connects the first gap 50 and the second gap 70.
[0063] The channel 60 does not penetrate the flange 31 in the radial direction of the through hole 211 , thereby ensuring that the flange 31 has a high mechanical strength, reducing the probability of damage to the flange 31 , and further ensuring the reliability of the connection between the flange 31 and the cover plate 20 .
[0064] Embodiment 4
[0065] like Fig. 9 As shown, the fourth embodiment is substantially the same as the first embodiment, and its distinguishing technical feature compared with the first embodiment is that a channel 60 is provided on the flange 31, and two ports of the channel 60 are respectively provided on the side surface of the flange 31 and the inner surface of the flange 31, and the channel 60 connects the first gap 50 and the second gap 70.
[0066] The side surface of the flange 31 is a surface on the flange 31 corresponding to the side wall of the second installation groove 213 , and the inner surface of the flange 31 is a surface on the flange 31 corresponding to the second step surface 25 .
[0067] The channel 60 does not penetrate the flange 31 in the radial direction of the through hole 211 , thereby ensuring that the flange 31 has a high mechanical strength, reducing the probability of damage to the flange 31 , and further ensuring the reliability of the connection between the flange 31 and the cover plate 20 .
[0068] Embodiment 5
[0069] like Fig.10 As shown, a channel 60 is provided on the flange 31 , and the channel 60 passes through the flange 31 in the axial direction of the through hole 211 , and the channel connects the first gap 50 with the external space of the housing 101 .
[0070] The channel 60 is not arranged between the shell 101 and the flange 31 , which effectively ensures a larger contact area between the shell 101 and the flange 31 while ensuring the use requirements of the flange 31 , thereby ensuring the connection reliability between the flange 31 and the shell 101 .
[0071] In the description of the present application, it should be noted that the terms “first” and “second” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0072] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. The term "plurality" refers to two or more, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0073] The present application has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, various replacements and improvements may be made to the present application, all of which fall within the scope of protection of the present application.
Claims
1. A single cell battery, characterized in that: The single cell battery comprises: A shell, wherein the shell has a housing cavity, a cavity wall of the housing cavity includes a first surface and a second surface that are arranged opposite to each other, the second surface is located in the housing cavity, a through hole penetrating the cavity wall is arranged on the shell in a direction perpendicular to the first surface, and a first mounting groove is also arranged on the shell, the first mounting groove intersects with the through hole, and a first step surface is formed at the intersection; A seal, wherein one end of the seal is provided with a flange, and the other end of the seal is provided with a limiting portion, the flange is pressed against the housing and is located on the first surface, the other end of the seal passes through the through hole, and the limiting portion is clamped on the second surface and cooperates with the flange to fix the seal on the housing; and A sealing ring is sleeved on the sealing member and supported between the flange and the first step surface. In the radial direction of the through hole, a first gap is provided between the outer annular surface of the sealing ring and the side wall of the first mounting groove, and the first gap is connected to the external space of the housing.
2. The single cell according to claim 1, characterized in that: The housing is also provided with a second mounting groove, the second mounting groove intersects with the first mounting groove and forms a second step surface at the intersection, the flange is pressed against the second step surface, and at least a part of the flange is located in the second mounting groove; A second gap is defined between the flange and the side wall of the second mounting groove, the second gap is communicated with the external space of the housing, and the first gap is communicated with the second gap.
3. The single cell according to claim 2, characterized in that: The second step surface is provided with a first groove, the first groove and the flange form a channel, and the channel connects the first gap and the second gap.
4. The single cell according to claim 3, characterized in that: In the circumferential direction of the through hole, the width of the first groove is 5% to 10% of the circumferential length of the second step surface in the width direction of the first groove.
5. The single cell according to claim 3, characterized in that: In the axial direction of the through hole, the depth of the first groove is 0.1 mm to 0.7 mm.
6. The single cell according to claim 3, characterized in that: The first surface is symmetrical about a center line on the first surface, and an extension direction of the center line is a length direction of the first surface; The first groove comprises a notch and a groove bottom which are arranged opposite to each other, and the notch is arranged on the second step surface; The plane where the first surface is located is a projection plane, and the projection of the bottom of the first groove on the projection plane does not overlap with the center line.
7. The single cell according to claim 2, characterized in that: The flange is provided with a channel, two ports of the channel are respectively provided on the side surface of the flange and the inner surface of the flange, and the channel connects the first gap and the second gap; The side surface of the flange is a surface on the flange corresponding to the side wall of the second mounting groove, and the inner surface of the flange is a surface on the flange corresponding to the second step surface.
8. The single cell according to claim 2, characterized in that: The housing is provided with a channel, two ports of the channel are respectively provided on the second step surface and the side wall of the first gap, and the channel connects the first gap and the second gap.
9. The single cell according to claim 2, characterized in that: A second groove is arranged on the surface of the flange that contacts the second step surface. The second groove and the second step surface form a channel, and the channel connects the first gap and the second gap.
10. The single cell according to claim 1, characterized in that: A channel is provided on the flange. In the axial direction of the through hole, the channel passes through the flange. The channel connects the first gap with the external space of the shell.
11. The single cell according to claim 1, characterized in that: In the radial direction of the through hole, the width of the first gap is 0.05 mm to 0.7 mm.
12. The single cell according to claim 1, characterized in that: The housing comprises a cover plate and a shell; The shell has a cavity with an opening at one end, and the cover plate is arranged on the shell and seals the opening to form the accommodating cavity; The cover plate has the first surface and the second surface.