Battery cell cover plate sealing structure and battery cell cover plate

Abstract

The utility model relates to the technical field of battery cell cover plates, in particular to a battery cell cover plate sealing structure and a battery cell cover plate, the battery cell cover plate sealing structure comprises a rotating plate rotationally connected with the battery cell cover plate, an elastic piece and a sealing plug are arranged on the lower surface of the rotating plate, the sealing plug is used for sealing a comprehensive hole formed in the battery cell cover plate, and the elastic piece is arranged on the lower surface of the rotating plate. The comprehensive hole is used for liquid injection, exhaust and lithium supplement of a battery cell, and the elastic piece is used for jacking one end of the rotating plate, so that the sealing plug is pressed towards the comprehensive hole or is prevented from being pressed towards the comprehensive hole. According to the utility model, liquid injection, exhaust and lithium supplement of the battery core are integrated, and meanwhile, high-pressure gas can smoothly burst through the sealing plug when short circuit occurs in the battery core, so that the use safety is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cover plates, and in particular to a battery cover plate sealing structure and a battery cover plate. Background Art

[0002] The positive and negative electrodes of conventional square shell batteries are made into finished electrodes through rolling and coating processes, and then the positive and negative electrodes and isolation films are wound into battery core packages through winding equipment, and then the battery adapter is welded to the battery lugs through laser welding, and the adapter is also laser welded to the battery pole. As the battery cell ages or an internal short circuit occurs, the internal gas of the square shell battery cell will break through the explosion-proof valve on the battery cover, and the valve will explode in an irreversible way.

[0003] The Chinese invention patent application with application publication number CN115472974A discloses a battery sealing safety device, a lithium sodium ion battery and a secondary utilization method. The application places an elastic ring and a rigid bead in a through hole, and the elastic ring or the elastic ring and the rigid bead bounce upward as a whole, which can relieve the pressure of the battery. By pressing the rigid bead into the net bag, the battery can be replenished and reused, thereby eliminating the pressure relief valve set on the metal cover of the existing lithium sodium ion battery. However, after the rigid bead is pressed into the net bag, if the battery rotates as a whole, the rigid bead is likely to move to the end of the elastic ring and be blocked at the end of the elastic ring under the action of the internal gas pressure of the battery. When the battery has an internal short circuit, the high-pressure gas inside the battery cannot be discharged due to the blockage of the rigid bead, which is prone to safety accidents. Utility Model Content

[0004] The purpose of the utility model is to address the defects of the prior art and provide a battery cover sealing structure and a battery cover. By eliminating the injection hole of the traditional battery cell, the explosion-proof valve of the traditional battery cell is designed to be a reusable elastic air pressure valve, and the injection hole, exhaust hole and lithium replenishing hole are integrated in one hole position, which can also ensure smooth pressure relief when the battery cell is short-circuited.

[0005] In order to solve the above technical problems, in the first aspect, the utility model provides a battery cell cover plate sealing structure, including a rotating plate rotatably connected to the battery cell cover plate, an elastic member and a sealing plug are arranged on the lower surface of the rotating plate, the sealing plug is used to seal the integrated hole opened on the battery cell cover plate, the integrated hole is used for liquid injection, exhaust and lithium replenishment of the battery cell, the elastic member is used to lift one end of the rotating plate so that the sealing plug is pressed against the integrated hole or prevents the sealing plug from being pressed against the integrated hole.

[0006] The utility model provides a rotating plate, and provides an elastic member and a sealing plug on the rotating plate. Under the action of the elastic member, when the elastic member pushes up one end of the rotating plate where the sealing plug is provided, the elastic member can be used to support the rotating plate, so that the sealing plug and the integrated hole remain separated, which is convenient for replenishing lithium and liquid inside the battery cell. When the elastic member pushes up one end of the rotating plate where the sealing plug is not provided, the elastic member can apply downward pressure to the sealing plug to assist the sealing plug in sealing the integrated hole.

[0007] In some embodiments, the elastic member and the sealing plug are respectively arranged near the two ends of the rotating plate, and the rotating plate is rotatably connected to the battery cell cover plate through a rotating shaft, and the rotating shaft is arranged between the elastic member and the sealing plug, so that the sealing plug is pressed toward the integrated hole under the action of the elastic member.

[0008] When the rotating shaft is arranged between the elastic member and the sealing plug, the elastic member can apply downward pressure to the sealing plug to assist the sealing plug in sealing the integrated hole.

[0009] In other embodiments, the rotating plate is rotatably connected to the battery cell cover plate via a rotating shaft, the rotating shaft and the sealing plug are respectively arranged near the two ends of the rotating plate, and the elastic member is arranged between the rotating shaft and the sealing plug, so that under the action of the elastic member, one end of the rotating plate where the sealing plug is arranged is tilted upward.

[0010] When the elastic member is arranged between the rotating shaft and the sealing plug, the elastic member can be used to support the rotating plate, so that the sealing plug and the integrated hole remain separated, which is convenient for replenishing lithium and liquid inside the battery cell.

[0011] Furthermore, a limiting ring is arranged on the outer wall of the sealing plug, and the limiting ring is used to adjust the pressure required for the sealing plug to be punched out of the integrated hole.

[0012] The utility model provides a limiting ring, which can prevent the sealing plug from being easily pushed open on the one hand, and can also adjust the pressure required for the sealing plug to be punched out of the integrated hole on the other hand.

[0013] Furthermore, a plurality of the limiting rings are provided, and a distance between two adjacent limiting rings is smaller than a ring width of the limiting ring.

[0014] The utility model arranges a plurality of limit rings, wherein the interval between two adjacent limit rings is smaller than the ring width of the limit rings, so that in the process of the sealing plug being lifted up by the gas pressure, the limit ring located at the upper part first bends and deforms downward, and after being deformed to a certain extent, it presses toward the limit ring located at the lower part, thereby increasing the gas pressure required for the sealing plug to be punched out of the integrated hole.

[0015] In a second aspect, the utility model provides a cell cover plate including the cell cover plate sealing structure, wherein a groove is provided on the upper surface of the cell cover plate, a comprehensive hole is provided at the bottom of the groove, the comprehensive hole passes through the groove, and the rotating plate is rotatably arranged in the groove.

[0016] Furthermore, a fixing hole is provided at the bottom of the groove, and the fixing hole is a blind hole. One end of the elastic member is fixedly disposed in the fixing hole, and the other end of the elastic member is connected to the rotating plate.

[0017] The utility model can reduce the influence of the elastic member on the rotation range of the rotating plate by arranging the elastic member in the fixing hole.

[0018] Furthermore, the elastic member and the sealing plug are respectively arranged near the two ends of the rotating plate, the rotating plate is rotatably connected to the battery cover plate through a rotating shaft, the rotating shaft is arranged near the middle of the rotating plate, and the top of the fixing hole is lower than the top of the integrated hole.

[0019] When the rotating shaft is arranged between the elastic member and the sealing plug, the top of the fixed hole is lower than the top of the integrated hole, so that the rotation range of the rotating plate is increased, and the shielding of the rotating plate to the space around the integrated hole is reduced, thereby reducing the impact on the injection and lithium replenishment operations.

[0020] Furthermore, a rotating hole is provided on the rotating plate, a rotating shaft is rotatably arranged in the rotating hole, and two ends of the rotating shaft are fixed on the inner wall of the groove.

[0021] Furthermore, the sealing plug is a rubber plug, and the sealing plug is interference fit with the integrated hole.

[0022] The beneficial effects of the utility model are:

[0023] 1. Compared with the prior art, the utility model integrates the functions of battery cell injection, exhaust and lithium supplementation, and can ensure that when a short circuit occurs inside the battery cell, the high-pressure gas can smoothly open the sealing plug, thereby ensuring the safety of use.

[0024] 2. The utility model eliminates the injection hole of the traditional battery cell, and integrates the injection hole, the exhaust hole, and the lithium replenishing hole into a comprehensive hole, thereby greatly reducing the functional integration cost of the battery cell shell, and eliminating the traditional processes of adding explosion-proof valve aluminum sheets and welding explosion-proof valve aluminum sheets, thereby saving welding processes, improving production efficiency, and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of Example 1;

[0026] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure of the upper surface of the cover plate in Example 1;

[0028] Figure 4 This is a schematic diagram of the structure of the upper surface of the rotating plate in Example 1;

[0029] Figure 5 This is a schematic diagram of the structure of the lower surface of the cover plate in Example 1;

[0030] Figure 6 It is a schematic structural diagram of the lower surface of the rotating plate in Example 1;

[0031] Figure 7 This is a schematic diagram of the structure of the upper surface of the cover plate in Example 2;

[0032] Figure 8 This is a schematic diagram of the structure of the lower surface of the rotating plate in Example 2.

[0033] Figure numerals: 1-cell cover; 2-pole; 3-groove; 4-rotating plate; 5-rotating shaft; 6-elastic member; 7-sealing plug; 8-integrated hole; 9-fixing hole; 10-limiting ring; 11-rotating hole; 12-step. DETAILED DESCRIPTION

[0034] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] Embodiment 1:

[0036] like Figure 1 As shown, this embodiment provides a housing, including a cell cover plate 1 , on which two poles 2 are fixedly arranged, and a cell cover plate sealing structure is arranged between the two poles 2 .

[0037] like Figure 2 , 3 As shown in Figures 5 and 6, a groove 3 is provided on the upper surface of the cell cover plate 1. The groove 3 is located between the two poles 2. The groove 3 is rectangular. A rotating shaft 5 is fixedly arranged in the groove 3. The two ends of the rotating shaft 5 are respectively fixedly connected to the two inner walls in the length direction of the groove 3. A comprehensive hole 8 and a fixing hole 9 are provided at the bottom of the groove 3. The comprehensive hole 8 is a through hole. The comprehensive hole 8 integrates the functions of the liquid injection hole, the exhaust hole, and the lithium replenishing hole. The liquid injection, exhaust and lithium replenishing of the battery cell can be realized through the comprehensive hole 8, and the fixing hole 9 is a blind hole for installing the elastic member 6.

[0038] like Figure 2 , 4As shown in Figures 6 and 7, the cell cover sealing structure includes a rotating plate 4, an elastic member 6, and a sealing plug 7. The length and width of the rotating plate 4 are respectively smaller than the length and width of the groove 3. A rotating hole 11 is provided near the left end of the rotating plate 4 along the width direction. The rotating plate 4 is mounted on the rotating shaft 5 through the rotating hole 11 so that the rotating plate 4 can rotate around the rotating shaft 5. The rotating hole 11 can be as close to the end of the rotating plate 4 as possible to increase the rotatable angle of the rotating plate 4. The elastic member 6 and the sealing plug 7 are both fixedly arranged on the lower surface of the rotating plate 4. In this embodiment, the elastic member 6 is a spring, and the sealing plug 7 is a rubber plug. The elastic member 6 is arranged corresponding to the fixing hole 9, and the upper end of the elastic member 6 is fixedly connected to the rotating plate 4, and the lower end of the elastic member 6 is fixedly connected to the bottom of the fixing hole 9 or is only inserted into the fixing hole 9, and the elastic member 6 is always in an extruded state; the sealing plug 7 is arranged corresponding to the integrated hole 8, and the diameter of the sealing plug 7 is larger than the diameter of the integrated hole 8, that is, when the rotating plate 4 is rotatably installed on the rotating shaft 5, rotating the rotating plate 4 can make the sealing plug 7 inserted into the integrated hole 8 to seal the integrated hole 8.

[0039] like Figure 6 As shown, the elastic member 6 is arranged near the middle of the rotating plate 4, and the rotating plate 4 can rotate around the left end of the rotating plate 4. When the sealing plug 7 is not inserted into the integrated hole 8, under the action of the elastic member 6, the right end of the rotating plate 4 is lifted up, so that the sealing plug 7 is away from the integrated hole 8. At this time, liquid can be injected and lithium can be replenished into the battery cell through the integrated hole 8 according to the use of the battery cell; when the sealing plug 7 is inserted into the integrated hole 8, the elastic member 6 is pressed into the fixing hole 9, and the upward force of the elastic member 6 on the rotating plate 4 becomes larger. Therefore, it is necessary to ensure that there is sufficient friction between the sealing plug 7 and the integrated hole 8 to avoid the sealing plug 7 being lifted up under the action of the elastic member 6 and the relatively small air pressure inside the battery cell.

[0040] It should be noted that if the elastic member 6 is always in a stretched state, the elastic member 6 can assist the sealing plug 7 to be pressed toward the integrated hole 8 .

[0041] In order to further ensure the sealing performance of the sealing plug 7, Figure 6As shown, two annular limiting rings 10 are integrally arranged on the outer wall of the sealing plug 7, and the spacing between the two limiting rings 10 is smaller than the ring width of the limiting ring 10. It can be understood that when the friction between the sealing plug 7 and the integrated hole 8 is insufficient, the limiting ring 10 located at the top will first press against the lower end of the integrated hole 8 to prevent the sealing plug 7 from being pushed out of the integrated hole 8. As the internal air pressure of the battery cell further increases, the upper limiting ring 10 is gradually squeezed. Since the spacing between the two limiting rings 10 is smaller than the ring width of the limiting ring 10, the upper limiting ring 10 will contact with the lower limiting ring 10 after being squeezed to a certain extent and further squeeze the lower limiting ring 10, further increasing the air pressure required for the sealing plug 7 to be pushed out of the integrated hole 8. Therefore, the air pressure required for the sealing plug 7 to be pushed out of the integrated hole 8 can be adjusted by setting different numbers of limiting rings 10 and limiting rings 10 with different ring widths, so as to ensure that the sealing plug 7 will be pushed out only when the internal gas pressure of the battery cell reaches the design value. In addition, when the inside of the battery cell needs to be vented, the sealing plug 7 can be opened by tooling to vent the battery cell. This venting method will not damage the battery cell, which provides convenience for the repair and maintenance of the battery cell.

[0042] In this embodiment, a cell cover sealing structure is provided in the groove 3 of the cell cover 1, and the injection hole, the exhaust hole, and the lithium replenishing hole are integrated into a comprehensive hole 8, and the comprehensive hole 8 is effectively sealed by the cell cover sealing structure. After the cell core package is assembled into the cell housing, the rotating plate 4 is opened by the tooling, and the cell electrolyte is effectively injected through the comprehensive hole 8; when the cell needs to be vented or the cell is bloated, the cell can be vented by opening the comprehensive hole 8. This venting method does not damage the cell, provides convenience for the cell repair and maintenance, and greatly reduces the repair and maintenance cost of the cell. When the cell is used for a longer period of time, the lithium salt inside the cell is further consumed, and the cycle life of the cell is further reduced, the cell can be further replenished with lithium through the comprehensive hole 8, thereby extending the service life of the cell and reducing the customer's use cost.

[0043] Embodiment 2:

[0044] Compared with the embodiment 1, the difference of the embodiment 2 is that the arrangement positions of the elastic member 6, the rotating hole 11, the fixing hole 9 and the rotating shaft 5 are changed.

[0045] like Figure 7 As shown, the rotating shaft 5 is arranged between the integrated hole 8 and the fixed hole 9. Figure 8 As shown, the elastic member 6 is arranged near the left end of the rotating plate 4 , and the rotating hole 11 is opened near the middle of the rotating plate 4 .

[0046] It can be understood that if the elastic member 6 is always in a squeezed state, under the action of the elastic member 6, the left end of the rotating plate 4 is tilted upward and the right end of the rotating plate 4 is pressed downward, then the elastic member 6 can assist the sealing plug 7 to be pressed toward the integrated hole 8; if the elastic member 6 is always in a pulled rope state, then the role of the elastic member 6 is to prevent the sealing plug 7 from being pressed toward the integrated hole 8, so as to facilitate liquid injection and lithium replenishment.

[0047] Since the rotation axis of the rotating plate 4 is close to the middle of the rotating plate 4, in order to increase the rotation angle of the rotating plate 4, a step 12 is provided at the bottom of the groove 3 so that Figure 7 The left side of the bottom of the middle groove 3 is lower than the right side. The fixing hole 9 is arranged on the left side of the groove 3, and the integrated hole 8 is arranged on the right side of the groove 3, which can increase the rotation angle of the rotating plate 4 to a certain extent, facilitating the injection and lithium replenishment operations.

[0048] The embodiments described above 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 aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A cell cover sealing structure, characterized in that: The invention comprises a rotating plate (4) rotatably connected to a cell cover plate (1), an elastic member (6) and a sealing plug (7) being arranged on the lower surface of the rotating plate (4), the sealing plug (7) being used to seal a comprehensive hole (8) provided on the cell cover plate (1), the comprehensive hole (8) being used for liquid injection, exhaust and lithium replenishment of the cell, the elastic member (6) being used to lift one end of the rotating plate (4) so ​​that the sealing plug (7) is pressed against the comprehensive hole (8) or to prevent the sealing plug (7) from being pressed against the comprehensive hole (8).

2. The cell cover sealing structure according to claim 1, characterized in that: The elastic member (6) and the sealing plug (7) are respectively arranged near the two ends of the rotating plate (4); the rotating plate (4) is rotatably connected to the cell cover plate (1) via a rotating shaft (5); the rotating shaft (5) is arranged between the elastic member (6) and the sealing plug (7), so that the sealing plug (7) is pressed toward the integrated hole (8) under the action of the elastic member (6).

3. The cell cover sealing structure according to claim 1, characterized in that: The rotating plate (4) is rotatably connected to the cell cover plate (1) via a rotating shaft (5); the rotating shaft (5) and the sealing plug (7) are respectively arranged near two ends of the rotating plate (4); the elastic member (6) is arranged between the rotating shaft (5) and the sealing plug (7), so that under the action of the elastic member (6), one end of the rotating plate (4) on which the sealing plug (7) is arranged is tilted upward.

4. The cell cover sealing structure according to claim 2 or 3, characterized in that: A limiting ring (10) is arranged on the outer wall of the sealing plug (7), and the limiting ring (10) is used to adjust the pressure required for the sealing plug (7) to be punched out of the integrated hole (8).

5. The cell cover sealing structure according to claim 4, characterized in that: A plurality of the limiting rings (10) are provided, and the distance between two adjacent limiting rings (10) is smaller than the ring width of the limiting ring (10).

6. A cell cover plate comprising the cell cover plate sealing structure according to any one of claims 1 to 5, characterized in that: The upper surface of the cell cover plate (1) is provided with a groove (3), the bottom of the groove (3) is provided with a comprehensive hole (8), the comprehensive hole (8) passes through the groove (3), and the rotating plate (4) is rotatably arranged in the groove (3).

7. The cell cover plate according to claim 6, characterized in that: A fixing hole (9) is provided at the bottom of the groove (3), and the fixing hole (9) is a blind hole. One end of the elastic member (6) is fixedly arranged in the fixing hole (9), and the other end of the elastic member (6) is connected to the rotating plate (4).

8. The cell cover plate according to claim 7, characterized in that: The elastic member (6) and the sealing plug (7) are respectively arranged near the two ends of the rotating plate (4); the rotating plate (4) is rotatably connected to the battery cover plate (1) via a rotating shaft (5); the rotating shaft (5) is arranged near the middle of the rotating plate (4); and the top of the fixing hole (9) is lower than the top of the integrated hole (8).

9. The cell cover plate according to claim 6, characterized in that: The rotating plate (4) is provided with a rotating hole (11), a rotating shaft (5) is rotatably arranged in the rotating hole (11), and two ends of the rotating shaft (5) are fixed on the inner wall of the groove (3).

10. The battery cover according to claim 6, characterized in that: The sealing plug (7) is a rubber plug, and the sealing plug (7) is interference fit with the integrated hole (8).

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