Anti-explosion valve structure and battery
By setting a pressure relief line trough on the valve body of the explosion-proof valve, the self-starting problem caused by stress concentration is solved, the service life of the explosion-proof valve is extended, and the safety and stability of the battery is improved.
Patent Information
- Application Number
- CN202422308760.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2034-09-20
AI Technical Summary
Existing explosion-proof valves are prone to self-starting under concentrated stress, which affects the safety of the battery cell. The microwave action causes the strength of the explosion-proof valve to be reduced and shortens the service life.
A pressure relief line trough is provided on the valve body of the explosion-proof valve, so that it extends in a certain direction and opens on one side surface, releases stress through the pressure relief line trough, reduces stress concentration, and differentiates the overall fluctuation of the valve body when the air pressure fluctuates.
It effectively reduces the chance of self-starting of the valve opening line under stress fluctuations, extends the service life of the explosion-proof valve, and improves the safety and stability of the battery.
Smart Images
Figure CN223156219U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of batteries, and in particular to an explosion-proof valve structure and a battery. Background Art
[0002] A power battery cell is composed of multiple structural components, among which the explosion-proof valve plays a particularly crucial role in the safety performance of the cell. As Figure 1 shown, an opening line is provided on the explosion-proof valve, which opens when the internal pressure of the battery is too high. The gas inside the cell can break through the opening line to discharge the internal pressure of the cell, preventing the accumulation of energy in the cell and causing a relatively large degree of cell explosion.
[0003] During the process of welding the explosion-proof valve to the substrate, assembling the cover plate, and recycling the cell, the above actions will all generate stress on the explosion-proof valve, and the stress on the explosion-proof valve is mostly concentrated on the opening line of the explosion-proof valve. As the stress concentration degree at the opening line increases, the explosion-proof valve is extremely likely to self-open under stress fluctuations, resulting in the failure of the explosion-proof valve and thus affecting the safety of the cell. In addition, during normal use or abnormal conditions (overcharging or overdischarging) of the cell, gas is generated inside the cell to produce internal pressure, and this internal pressure acts on the explosion-proof valve cyclically, causing the explosion-proof valve to exhibit a micro-fluctuating action of rising and falling. This micro-fluctuating action usually leads to a reduction in the strength of the opening line of the explosion-proof valve and affects the service life of the explosion-proof valve. Summary of the Utility Model
[0004] The purpose of the present application is to provide an explosion-proof valve structure and a battery to solve to a certain extent the technical problems existing in the prior art, such as as the stress concentration degree at the notch increases, the explosion-proof valve is extremely likely to self-open under stress fluctuations, resulting in the failure of the explosion-proof valve and thus affecting the safety of the cell, and the micro-fluctuating action usually leads to a reduction in the strength of the notch of the explosion-proof valve and affects the service life of the explosion-proof valve.
[0005] According to the first aspect of the present application, an explosion-proof valve structure is provided, including a valve body, a connecting edge, an opening line, and a pressure relief groove. The connecting edge is arranged around the valve body for connecting the explosion-proof valve structure to the battery housing;
[0006] The opening line is arranged along the edge of the valve body. The valve body extends in a first direction, and the valve body is provided with a pressure relief groove, at least part of the pressure relief groove extends along the first direction, and the pressure relief groove forms an opening on one side surface of the valve body.
[0007] Preferably, the valve body has a first center line extending along the first direction;
[0008] The number of the pressure relief grooves is two, and the two pressure relief grooves are symmetrically arranged with respect to the first center line.
[0009] Preferably, the pressure relief slot includes a straight slot and an inclined slot. The straight slot extends along the first direction, and the inclined slots are respectively arranged at both ends of the straight slot in the first direction.
[0010] The straight slot is arranged in the middle of the valve body in the second direction. The inclined slots are inclined from the middle of the valve body in the second direction towards the edge of the valve body in the second direction. The second direction intersects with the first direction.
[0011] Preferably, the straight slots of the two pressure relief slots are arranged in contact with each other.
[0012] Preferably, the valve body has a second center line extending along the second direction.
[0013] Each pressure relief slot is a symmetric figure with the second center line as the axis of symmetry.
[0014] Preferably, define the dimension of the pressure relief slot in the first direction as a, and the dimension of the inclined slot in the first direction as L2, where
[0015] Preferably, the slot widths of both the straight slot and the inclined slot are equal.
[0016] Preferably, in the third direction, the depth of the valve opening line is greater than the depth of the pressure relief slot. The third direction is perpendicular to the first direction.
[0017] Preferably, define the dimension of the valve body in the third direction as h1, and the dimension of the pressure relief slot as h2, where
[0018] According to the second aspect of the present application, a battery is provided, including the explosion-proof valve structure described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of this explosion-proof valve structure, which will not be elaborated here.
[0019] Compared with the prior art, the beneficial effects of the present application are:
[0020] The explosion-proof valve structure provided by the present application is provided with a pressure relief groove on the valve body, and at least a part of the pressure relief groove is along the extension direction of the explosion-proof valve, and the pressure relief groove is formed open on the surface of one side of the valve body. In this way, on the one hand, when the valve body is subjected to stress (for example, the stress acting on the explosion-proof valve structure during the welding process of the explosion-proof valve and the substrate, the process of assembling the cover plate, and the process of recycling the battery cell), the stress can be released through the deformation of the pressure relief groove of the valve body, which effectively avoids the stress concentration at the valve opening mark, and reduces the probability of the valve opening mark self-opening under stress fluctuation. On the other hand, when the explosion-proof valve structure is subjected to air pressure shock and fluctuates during normal use or abnormal state of the battery cell, the pressure relief groove extending at least partially along the first direction can effectively differentiate the overall fluctuation of the valve body, thereby weakening the micro-fluctuation of the valve body, and thus extending the service life of the explosion-proof valve.
[0021] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0023] Figure 1 It is an axonometric structural diagram of an existing explosion-proof valve structure;
[0024] Figure 2 A schematic diagram of the front view of the explosion-proof valve structure provided in an embodiment of the present application;
[0025] Figure 3 A schematic diagram of the axonometric structure of the explosion-proof valve structure provided in an embodiment of the present application;
[0026] Figure 4 Another schematic diagram of the front view of the explosion-proof valve structure provided in the embodiment of the present application;
[0027] Figure 5 for Figure 4 A schematic diagram of a cross-sectional structure of the explosion-proof valve structure provided by cutting along the AA direction;
[0028] Figure 6 for Figure 5 An enlarged schematic diagram of the explosion-proof valve structure at position B is provided.
[0029] Reference numerals:
[0030] 1 - valve body main body; 11 - first center line; 12 - second center line; 13 - valve opening flat edge; 14 - valve cover part; 2 - connecting edge; 3 - valve opening engraved line; 4 - pressure relief wire groove; 41 - straight groove; 42 - inclined wire groove.
[0031] F1 - first direction; F2 - second direction; F3 - third direction. Detailed implementation manners
[0032] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.
[0033] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.
[0034] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the scope of protection of the present application.
[0035] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application 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 a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0036] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.
[0037] Next, refer to Figures 2 to 6 Describe the explosion-proof valve structure and battery according to some embodiments of the present application.
[0038] See Figures 2 to 6As shown in the figure, an embodiment of the first aspect of the present application provides an explosion-proof valve structure, including a valve body main body 1, a connecting edge 2, an opening valve scribed line 3, and a pressure relief groove 4. The connecting edge 2 is arranged around the valve body main body 1 for connecting the explosion-proof valve structure to the battery case. The opening valve scribed line 3 is arranged along the edge of the valve body main body 1. The valve body main body 1 extends along the first direction F1. The valve body main body 1 is provided with a pressure relief groove 4, and at least part of the pressure relief groove 4 extends along the first direction F1. The pressure relief groove 4 forms an opening on one side surface of the valve body main body 1.
[0039] According to the explosion-proof valve structure provided by the above technical features, by providing a pressure relief groove 4 on the valve body main body 1, and making at least part of the pressure relief groove 4 extend along the extending direction of the explosion-proof valve, and making the pressure relief groove 4 form an opening on one side surface of the valve body main body 1. In this way, on the one hand, when the valve body main body 1 bears stress (for example, the stress acting on the explosion-proof valve structure during the welding process of the explosion-proof valve and the substrate, the assembly process of the cover plate, and the cyclic use process of the battery cell), the stress can be released through the deformation of the pressure relief groove 4 of the valve body main body 1, effectively avoiding stress concentration at the opening valve scribed line 3 and reducing the probability of self-opening of the opening valve scribed line 3 under stress fluctuations. On the other hand, when the explosion-proof valve structure is affected by air pressure impact and fluctuates during normal use or abnormal conditions of the battery cell, the pressure relief groove 4 provided with at least part extending along the first direction F1 can effectively divide the overall fluctuation of the valve body main body 1, thereby weakening the micro-fluctuation of the valve body main body 1 and prolonging the service life of the explosion-proof valve.
[0040] Preferably, as Figures 2 to 4 shown, the valve body main body 1 has a first center line 11 extending along the first direction F1. The number of the pressure relief grooves 4 is two, and the two pressure relief grooves 4 are symmetrically arranged with respect to the first center line 11. In this way, to ensure the uniformity of the distribution of the pressure relief grooves 4 in the valve body main body 1, and further ensure whether the valve body main body 1 can relieve pressure evenly.
[0041] Preferably, as Figures 2 to 4 shown, the pressure relief groove 4 includes a straight groove 41 and an inclined groove 42. The straight groove 41 extends along the first direction F1, and the inclined grooves 42 are respectively arranged at both ends of the straight groove 41 in the extending direction. The straight groove 41 is arranged in the middle of the valve body main body 1 in the second direction F2, and the inclined groove 42 inclines from the middle of the valve body main body 1 in the second direction F2 to the edge of the valve body main body 1 in the second direction F2. In this way, on the one hand, the coverage area of the pressure relief groove 4 can be effectively increased through the arrangement of the inclined groove 42 and the straight groove 41; on the other hand, the inclined groove 42 can effectively reduce the micro-fluctuation of the valve body main body 1.
[0042] As Figures 2 to 6As shown, F1 shown in the figure can be an example of the above-mentioned first direction F1, and F2 shown in the figure can be an example of the above-mentioned second direction F2. Among them, the second direction F2 can intersect with the first direction F1. Preferably, Figures 2 to 6 As shown, an example is shown where the first direction F1 is perpendicular to the second direction F2. For the convenience of description, the direction perpendicular to the plane determined by both the first direction F1 and the second direction F2 is defined as the third direction F3, and F3 shown in the figure can be an example of the above-mentioned third direction F3.
[0043] Preferably, as Figures 2 to 4 shown, the valve body main body 1 has a second center line 12 extending along the second direction F2. Each pressure relief groove 4 is a symmetric figure with the second center line 12 as the axis of symmetry to ensure the distribution symmetry of the pressure relief groove 4 in the first direction F1. In other words, the above-mentioned pressure relief groove 4 can be similar to the shape formed by the top side and two waist lines of an isosceles trapezoid.
[0044] Correspondingly, as Figure 4 shown, the dimension of the pressure relief groove 4 in the first direction F1 is defined as a, and the distance from one end of the pressure relief groove 4 in the first direction F1 to the second center line 12 is L1, where
[0045] Preferably, as Figures 2 to 4 shown, the straight grooves 41 of the two pressure relief grooves 4 can be arranged in contact with each other to ensure that the pressure relief grooves 4 can cover the valve body main body 1 completely.
[0046] Preferably, as Figures 4 to 6 shown, the straight grooves 41 of the above two pressure relief grooves 4 are connected, that is, there is no groove wall between the straight grooves 41 of the two pressure relief grooves 4 to improve the deformation sensitivity of the central position of the valve body main body 1.
[0047] Preferably, as Figure 4 shown, the dimension of the inclined groove 42 in the first direction F1 is defined as L2, where to ensure the distribution area of the inclined groove 42 to further reduce the micro-vibration of the valve body main body 1.
[0048] For example, Figure 4 shows an example of , that is
[0049] Preferably, the groove widths of both the straight groove 41 and the inclined groove 42 are equal to facilitate the processing of the pressure relief groove 4. It should be noted that the groove width of the above-mentioned straight groove 41 can be understood as the dimension of the straight groove 41 in the second direction F2; the above-mentioned inclined groove 42 can be understood as the dimension of the inclined groove 42 in the direction perpendicular to the extension direction of the inclined groove 42.
[0050] In an embodiment, as Figures 2 to 4 shown, the above-mentioned connecting edge can be arranged along the edge of the above-mentioned valve body main body 1 for one week. Preferably, as Figure 5 shown, in the third direction F3, the size of the above-mentioned connecting edge is larger than the size of the above-mentioned valve body plate main body. In this way, on the one hand, the strength of the edge of the valve body main body 1 is increased to improve the anti-deformation strength of the explosion-proof valve structure; on the other hand, the contact area between the connecting edge and the battery housing is increased, thereby improving the connection stability between the explosion-proof valve structure and the battery housing.
[0051] Preferably, as Figure 4 and Figure 5 shown, the above-mentioned valve body main body 1 can include a valve-opening flat edge 13 and a valve cover part 14. The valve-opening flat edge 13 is arranged along the valve cover part 14 for one week, and the above-mentioned connecting edge is integrally connected to the valve cover part 14 via the valve-opening flat edge 13. The above-mentioned valve-opening scoring line 3 is arranged on the above-mentioned valve-opening flat edge 13.
[0052] Preferably, as Figures 2 to 4 shown, the above-mentioned valve-opening scoring line 3 is linear and is arranged around the valve cover part 14. The length of the above-mentioned valve-opening scoring line 3 exceeds half of the circumference of the above-mentioned valve cover part 14.
[0053] Optionally, not shown in the figure, the above-mentioned valve-opening scoring line 3 can also be arranged around the above-mentioned valve cover part 14 for one week, that is, the valve-opening scoring line 3 can be in a closed loop shape.
[0054] Preferably, as Figure 5 and Figure 6 shown, in the third direction F3, the depth of the valve-opening scoring line 3 is greater than the depth of the pressure relief groove 4, so as to prevent the air pressure inside the battery from breaking through the pressure relief groove 4.
[0055] Furthermore, as Figure 6 shown, it is defined that in the third direction F3, the size of the valve body main body 1 is h1, and the size of the pressure relief groove 4 is h2, where
[0056] Optionally, the above-mentioned valve cover part 14 can be in a convex cover shape, that is, in the state where the explosion-proof valve structure is covered on the explosion-proof port of the battery housing, the valve cover part 14 protrudes outward from the battery housing relative to the valve-opening flat edge 13, so as to adapt to the impact of the airflow inside the battery.
[0057] According to the explosion-proof valve structure provided by the above technical features, when the assembly stress between the connecting edge 2 and the battery housing causes stress concentration at the valve-opening notch, the straight groove 41 and the inclined groove 42 interact with each other, so that the pressure relief groove 4 of the valve body 1 is more likely to deform, thereby buffering the stress concentration at the valve-opening notch, and improving the overall performance stability of the explosion-proof valve. At the same time, the valve-opening notches are overall distributed in the middle of the explosion-proof valve, improving the stability of the valve body 1 and making the micro-fluctuation form of the explosion-proof valve structure more uniform, thereby prolonging the service life of the explosion-proof valve.
[0058] An embodiment of the second aspect of the present application further provides a battery, including the explosion-proof valve structure described in any of the above embodiments. Therefore, it has all the beneficial technical effects of the explosion-proof valve structure, and will not be elaborated here.
[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. An explosion-proof valve structure, characterized in that, It includes a valve body main body, a connecting edge, an opening valve line and a pressure relief groove. The connecting edge is arranged around the valve body main body for connecting the explosion-proof valve structure with the battery housing. The opening valve line is arranged along the edge of the valve body main body. The valve body main body extends in a first direction. The valve body main body is provided with a pressure relief groove, and at least a part of the pressure relief groove extends along the first direction. The pressure relief groove is open on one side surface of the valve body main body.
2. The explosion-proof valve structure according to claim 1, characterized in that The valve body main body has a first center line extending along the first direction. The number of the pressure relief grooves is two, and the two pressure relief grooves are symmetrically arranged with respect to the first center line.
3. The explosion-proof valve structure according to claim 2, wherein The pressure relief groove includes a straight groove and an inclined groove. The straight groove extends along the first direction, and the inclined grooves are respectively arranged at both ends of the straight groove in the first direction. The straight groove is arranged in the middle of the valve body main body in a second direction. The inclined groove inclines from the middle of the valve body main body in the second direction to the edge of the valve body main body in the second direction. The second direction intersects with the first direction.
4. The explosion-proof valve structure according to claim 3, wherein, The straight grooves of the two pressure relief grooves are arranged in contact with each other.
5. The explosion-proof valve structure according to claim 3, characterized in that The valve body main body has a second center line extending along the second direction. Each of the pressure relief grooves is a symmetric figure with the second center line as the axis of symmetry.
6. The explosion-proof valve structure according to claim 5, characterized in that Define the dimension of the pressure relief slot in the first direction as a, and the dimension of the inclined slot in the first direction as L2, where, 7. The explosion-proof valve structure according to claim 3, characterized in that, The groove widths of both the straight groove and the inclined groove are equal.
8. The explosion-proof valve structure according to any one of claims 1 to 7, characterized in that, In a third direction, the depth of the opening valve line is greater than the depth of the pressure relief groove. The third direction is perpendicular to the first direction.
9. The explosion-proof valve structure according to claim 8, characterized in that Defined in the third direction, the dimension of the valve body is h1, and the dimension of the pressure relief groove is h2, where, 10. A battery, characterized in that, It includes the explosion-proof valve structure according to any one of claims 1 to 9.