Sealing structure and explosion-proof structure of bipolar battery

Abstract

The present invention discloses a sealing structure and an explosion-proof structure of a bipolar battery, wherein the sealing structure is composed of a first plate frame and a second plate frame which are stacked in an alternating manner; the injection holes of the first plate frame and the second plate frame are respectively located at different positions, so that more than two rows of injection holes are formed on the stacked sealing frame, and the positions of the injection holes are staggered and do not interfere with each other; a sealing plug is provided at the injection hole port; the sealing plug comprises a mounting plate, a support tube is provided at the bottom end of the mounting plate, a hollow shaft for sleeved with a first spring is provided at the upper end, and a pressure plate is provided at the upper end of the first spring; the upper end of the support tube is connected to the hollow shaft; an elastic plug head for blocking the injection hole is sleeved on the support tube; an exhaust hole is provided on the side wall of the hollow shaft to connect to the inner cavity of the hollow shaft; a plug for blocking the bottom port is provided in the hollow shaft, a second spring is provided at the upper end of the plug, and the second spring is pressed by a set screw; the set screw is threadedly connected in the hollow shaft.

Description

Technical Field

[0001] The invention belongs to the technical field of bipolar batteries, and in particular relates to a sealing structure and an explosion-proof structure of a bipolar battery. Background Art

[0002] Bipolar batteries are composed of multiple sealed frames stacked together, with diaphragms and bipolar pole pieces installed in an alternating manner inside the sealed frames, and active materials of different polarities are coated on both sides of the bipolar pole pieces. It can be simply understood as a battery composed of multiple battery cells stacked in series, each battery cell consisting of a sealed frame, a bipolar pole piece and a diaphragm; this type of battery has the characteristics of high voltage, high energy density and high current capacity.

[0003] The voltage height of a bipolar battery is related to the number of its cells connected in series. In order to increase the energy density, it is necessary to reduce the thickness of the battery cells so that more battery cells can be stacked in series in a smaller space.

[0004] In the prior art, each sealing frame on the battery cell of a bipolar battery needs to have an injection hole for injecting electrolyte and for discharging excess gas generated during charging. A sealing plug is provided on the injection hole. Usually, for ease of assembly, the injection holes on each sealing frame are opened at the same position. Since the injection hole occupies a certain thickness space, the thickness of each sealing frame is limited, resulting in a limited number of battery cells that can be stacked in the same volume of a bipolar battery, thereby limiting the voltage of the bipolar battery.

[0005] At present, the sealing plug of bipolar batteries is generally made of elastic rubber material, and the upper end is pressed by a spring; when the gas pressure in the battery cavity is higher than the spring pressure, the sealing plug can automatically open to release the gas pressure. When the diameter of the sealing plug becomes smaller, its supporting strength is poor and it is easy to bend and deform, which affects the sealing or gas pressure release in the bipolar battery and reduces the safety of the bipolar battery. Summary of the invention

[0006] The present invention provides a sealing structure and an explosion-proof structure of a bipolar battery. On the one hand, the battery cells of the bipolar battery can be made thinner, and more battery cells can be stacked and connected in series within a unit volume. On the other hand, the sealing plug can be made smaller in diameter while maintaining sufficient supporting strength to improve the stability in use and the sealing effect. At the same time, a multi-layer pressure relief function can be realized, thereby preventing explosion caused by excessive pressure in the battery that cannot be relieved, thereby achieving an explosion-proof effect.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] A sealing structure of a bipolar battery, comprising a first plate frame and a second plate frame which are stacked in an interlaced manner; the injection holes of the first plate frame and the second plate frame are respectively located at different positions, so that more than two rows of injection holes are formed on the stacked sealing frame, the injection holes are arranged in an interlaced manner without interfering with each other, and each battery cell corresponds to one injection hole; the injection hole port is provided with a sealing plug;

[0009] The sealing plug comprises a mounting plate, a support tube is arranged at the bottom end of the mounting plate, a hollow shaft for sleeve-connecting a first spring is arranged at the upper end, and a pressure plate is arranged at the upper end of the first spring;

[0010] The upper end of the support tube is connected to the hollow shaft; an elastic plug for blocking the injection hole is sleeved on the support tube; a vent hole is provided on the side wall of the hollow shaft to connect to the inner cavity of the hollow shaft; a plug for blocking the bottom port is provided in the hollow shaft, a second spring is provided on the upper end of the plug, and the second spring is pressed by a set screw; the set screw is threadedly connected in the hollow shaft, and the sealing plug is designed with more than two rows and is arranged in the injection hole of the sealing frame, and each sealing plug works independently.

[0011] As a further improvement of the above technical solution, the sides of the first plate frame and the second plate frame are both provided with a first notch and a second notch.

[0012] two notches; the injection hole of the first plate frame is located in the first notch; the injection hole of the second plate frame is located in the second notch; and a pressure plate is provided on both the first notch and the second notch to press the sealing plug.

[0013] The technical effect of the above improvement is that the first notch and the second notch can facilitate the installation and positioning of the pressure plate.

[0014] As a further improvement of the above technical solution, the first plate frame and the second plate frame are sheet-like rectangular frame structures, with the first sealing groove frame and the second sealing strip frame provided on one side, and the first sealing strip frame and the second sealing groove frame provided on the other side; the first sealing groove frame cooperates with the first sealing strip frame; the second sealing strip frame cooperates with the second sealing groove frame.

[0015] The technical effect of the above improvement is: the sealing performance between two adjacent sealing frames is improved by using a double-layer sealing strip, thereby improving battery safety.

[0016] As a further improvement of the above technical solution, the injection hole port is provided with a conical countersunk hole for accommodating a sealing plug; the maximum inner diameter of the countersunk hole is greater than the plate thickness of the first plate frame or the second plate frame.

[0017] The technical effect of the above improvement is: the countersunk hole is used to accommodate the sealing plug. Since the sealing frame plate is thinner, the inner diameter of the countersunk hole will exceed the thickness of the sealing frame plate, so that the three adjacent sealing frame plates together constitute the inner hole of the countersunk hole.

[0018] As a further improvement of the above technical solution, a matching sealant groove is provided between the first plate frame and the second plate frame, and the sealant groove is provided between the first sealing groove frame and the second sealing strip frame.

[0019] The technical effect of the above improvement is: by providing a sealing glue groove, the sealing performance of the bipolar battery is improved.

[0020] As a further improvement of the above technical solution, the support tube, the mounting plate and the hollow shaft are an integrated structure.

[0021] Axis settings.

[0022] The technical effect of the above improvement is to improve the connection strength and structural stability of the support tube, the mounting plate and the hollow shaft.

[0023] As a further improvement of the above technical solution, the elastic plug is in the shape of a cone, with a through hole in the center for being sleeved on the support tube; the top end of the elastic plug is tightly arranged on the mounting plate.

[0024] The technical effects of the above improvements are: the cone-shaped elastic plug can better seal the injection hole; the close arrangement of the elastic plug and the mounting plate can improve the sealing between the elastic plug and the mounting plate.

[0025] As a further improvement of the above technical solution, a boss is arranged at the top end of the elastic plug, and the boss is matched with the recessed groove on the bottom surface of the mounting plate.

[0026] The technical effect of the above improvement is: by adding a boss and cooperating with the groove, the sealing performance between the elastic plug and the mounting plate is improved.

[0027] As a further improvement of the above technical solution, the maximum outer diameter of the elastic plug is not greater than the diameter of the mounting disk.

[0028] The technical effect of the above improvement is: the strength of the upper end of the elastic plug is improved by the installation disk to prevent the elastic plug from deformation. The maximum outer diameter of the elastic plug is smaller than the installation disk to prevent the upper end surface of the elastic plug from deformation.

[0029] As a further improvement of the above technical solution, a mounting hole for accommodating the first spring and the sealing plug is provided on the bottom surface of the pressure plate.

[0030] The technical effect of the above improvement is: the spring and the sealing plug are positioned and installed through the installation holes on the pressure plate, thereby improving the structural stability.

[0031] An explosion-proof structure of a bipolar battery adopts the sealing structure, the sealing plug is used to block the injection hole on the sealing frame of the bipolar battery; a first spring is sleeved on the hollow shaft; the upper end of the first spring is pressed through the mounting hole of a pressing plate; and the pressing plate is connected to the bipolar battery shell.

[0032] The technical effect of the explosion-proof structure of the above-mentioned bipolar battery is as follows: the pressure plate, the first spring and the sealing plug constitute a first pressure relief valve structure. When the air pressure in the battery cavity is too high, the first spring is compressed and the sealing plug rises to relieve pressure; the set screw, the second spring and the plug constitute a second pressure relief valve structure. When the first pressure relief valve fails, the second spring is compressed and the plug rises, and the gas can pass through the support tube and the hollow shaft to release pressure from the exhaust hole, thereby improving the explosion-proof effect of the entire battery.

[0033] Compared with the prior art, the beneficial technical effects of the present invention are:

[0034] 1. Two types of plate frames are stacked in an alternating manner. The injection holes of the two types of plate frames are located at different positions, so that the final sealed frame forms more than two rows of injection holes. Each battery cell corresponds to an injection hole. The injection holes are arranged in an alternating manner, so they do not interfere with each other, so that the thickness of the sealing frame can be further reduced; more plate frames are stacked in a unit volume, and more battery cells are added, thereby improving the energy density and power density of the bipolar battery.

[0035] 2. Traditional sealing plugs are all made of elastic materials, while in this technical solution, only the elastic plug head is made of elastic rubber, which is used to block the injection hole. The elastic plug head is sleeved on the support shaft, and the support shaft is used to improve the support strength of the elastic plug head to prevent the elastic plug head from bending and deforming in the axial direction; the mounting plate is used to prevent the upper end surface of the elastic plug head from deforming. The designed support tube is connected to the injection hole, and the upper end of the support tube is connected to the hollow shaft. The hollow shaft can be used to support the first spring, and a plug and a second spring are designed inside. The side wall is designed with an exhaust hole, which together constitutes a pressure relief valve structure; under normal circumstances, the first spring controls the lifting and lowering of the sealing plug to relieve pressure. When a fault occurs, the second spring and the plug realize secondary pressure relief, thereby realizing a double-protected pressure relief process, preventing battery explosion, and improving safety. When the elastic plug head is damaged, it can be removed and replaced without replacing the entire sealing plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Schematic diagram of the battery structure consisting of a sealed frame.

[0037] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of local A in the middle.

[0038] Figure 3 Schematic diagram of the internal structure of the battery consisting of a sealed frame.

[0039] Figure 4 It is a schematic diagram of the structure after three adjacent sealing frames are superimposed.

[0040] Figure 5 for Figure 4 Schematic diagram of the enlarged structure of part B in the middle.

[0041] Figure 6 Schematic diagram of the sealing strip frame structure on both sides of the plate frame.

[0042] Figure 7 It is a schematic diagram of the first plate frame structure.

[0043] Figure 8 It is a schematic diagram of the second plate frame structure.

[0044] Fig. 9 Schematic diagram of the injection hole structure in the plate frame.

[0045] Fig.10 It is a schematic diagram of the pressure plate structure.

[0046] Fig.11 It is a schematic diagram of the cross-sectional structure of the sealing plug.

[0047] Fig.12 Another structural schematic diagram of the sealing plug.

[0048] Fig.13 Schematic diagram of the cross-sectional structure of the sealing plug installation.

[0049] In the figure: 1. first plate frame; 2. second plate frame; 3. injection hole; 31. countersunk hole; 4. sealing plug; 41. support tube; 42. elastic plug head; 43. mounting plate; 44. hollow shaft; 45. exhaust hole; 46. plug; 47. second spring; 48. set screw; 49. boss; 5. bipolar pole piece; 6. diaphragm; 7. pressure plate; 71. mounting hole; 8. bottom plate; 9. first spring; 11. first notch; 12. second notch; 13. first sealing groove frame; 14. second sealing strip frame; 15. first sealing strip frame; 16. second sealing groove frame. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the protection scope of the present invention. Example 1

[0051] See also Figures 1 to 11A sealing frame of a bipolar battery, comprising a first plate frame 1 and a second plate frame 2 which are stacked in an interlaced manner; the injection holes 3 of the first plate frame 1 and the second plate frame 2 are respectively located at different positions, so that two rows of injection holes 3 are formed on the stacked sealing frame, the two rows of injection holes 3 are arranged in an interlaced manner without interfering with each other, each battery cell corresponds to one injection hole 3, and a sealing plug 4 is arranged at the port of the injection hole 3;

[0052] The sealing plug 4 includes a mounting plate 43, a supporting tube 41 is provided at the bottom end of the mounting plate 43, a hollow shaft 44 for sleeved with the first spring 9 is provided at the upper end, and a pressure plate 7 is provided at the upper end of the first spring 9; the upper end of the supporting tube 41 is connected to the hollow shaft 44; an elastic plug head 42 for blocking the injection hole 3 is sleeved on the supporting tube 41; an exhaust hole 45 is provided on the side wall of the hollow shaft 44 to connect to the inner cavity of the hollow shaft 44; a plug 46 for blocking the bottom port is provided in the hollow shaft 44, a second spring 47 is provided at the upper end of the plug 46, and the second spring 47 is pressed by a set screw 48; the set screw 48 is threadedly connected in the hollow shaft 44, and the sealing plug 4 is designed with more than two rows and is arranged in the injection hole 3 of the sealing frame, and each sealing plug works independently.

[0053] Specifically, the first plate frame 1 and the second plate frame 2 are both in the shape of flat plate frames, and both sides are provided with recessed grooves for installing the diaphragm 6 and the bipolar pole piece 5; the injection hole 3 is located on the same side of the first plate frame 1 and the second plate frame 2.

[0054] Specifically, the diameter of the support tube 41 is smaller than the minimum outer diameter of the elastic plug 42; the elastic plug 42 and the support tube 41 adopt an interference fit; the upper end of the elastic plug 42 is tightly installed with the bottom surface of the mounting plate 43, and glue can be added on the fitting surface; the length of the hollow shaft 44 needs to be smaller than the length of the first spring 9, and the hollow shaft 44 is mainly used to position the first spring 9, so it does not need to be designed to be too long; the elastic plug 42 is a truncated cone structure; the plug 46 can be a truncated cone structure, and the bottom surface of the hollow shaft 44 is also designed to match the shape of the plug; the plug 46 can be made of elastic rubber material; the second spring 47 is movably installed in the hollow shaft 44; the plug 46 and the inner wall of the hollow shaft 44 can adopt a clearance fit to facilitate the up and down movement of the plug; the exhaust hole 45 can be located above the plug 46 or at the side of the plug 46; the set screw 48 adopts a screw-free structure, and the top end is a hexagonal groove; the pressure of the second spring on the plug 46 is adjusted by rotating the set screw 48.

[0055] Based on the above embodiment, the sealing frame is further optimized to have at least two rows of injection holes, which are staggered with each other, so that the number of battery cells in the bipolar battery is greater, but the spacing between the injection holes in the same row is wide enough.

[0056] Based on the above embodiment, the support tube 41, the mounting plate 43 and the hollow shaft 44 are an integrated structure and are coaxially arranged with each other.

[0057] Based on the above embodiment, the elastic plug 42 is further optimized in that it is in the shape of a cone, and a through hole is provided in the center for being sleeved on the support tube 41 ; the top end of the elastic plug 42 is closely arranged with the mounting plate 43 .

[0058] Specifically, in this embodiment, the bipolar pole piece 5, the positive monopolar piece and the negative monopolar piece, and the separator 6 are assembled into a bipolar battery. In this embodiment, there are 14 bipolar pole pieces, that is, the bipolar battery is composed of 15 cells, namely battery cells No. 1, 2, 3, 4...13, 14, and 15. The positions of the two rows of injection holes are staggered, and the first row of injection holes corresponds to battery cells No. 1, 3, 5, 7, 9, 11, 13, and 15, and the second row of injection holes corresponds to battery cells No. 2, 4, 6, 8, 10, 12, and 14. Example 2

[0059] like Figure 2-5 As shown, based on the above embodiment, further optimization is performed, the sides of the first plate frame 1 and the second plate frame 2 are both provided with a first slot 11 and a second slot 12; the injection hole 3 of the first plate frame 1 is located in the first slot 11; the injection hole 3 of the second plate frame 2 is located in the second slot 12; and the first slot 11 and the second slot 12 are both provided with a pressure plate 7 to press the sealing plug 4.

[0060] Specifically, a certain distance is left between the first notch 11 and the second notch 12 ; the first notch 11 and the second notch 12 cooperate with the pressing plate 7 ; and just fit into the pressing plate 7 . Example 3

[0061] like Figure 6-8 As shown, based on the above embodiment, the first plate frame 1 and the second plate frame 2 are sheet-like rectangular frame structures, with a first sealing groove frame 13 and a second sealing strip frame 14 provided on one side, and a first sealing strip frame 15 and a second sealing groove frame 16 provided on the other side; the first sealing groove frame 13 cooperates with the first sealing strip frame 15; the second sealing strip frame 14 cooperates with the second sealing groove frame 16.

[0062] Specifically, the first plate frame 1 and the second plate frame 2 have the same size, and only the positions of the injection holes are different; recessed surfaces are provided on both sides of the plate frame for installing the diaphragm 6 and the bipolar pole piece 5; perforations are distributed on the plate frame for fixing and connecting the plate frames by bolts after stacking and connecting them in series; the first sealing strip frame 15 between adjacent plate frames is embedded in the first sealing groove frame 13, and the second sealing strip frame 14 is embedded in the second sealing groove frame 16, so that a sealing ring is formed between the plate frames.

[0063] Specifically, a matching sealant groove (not shown) is provided between the first plate frame 1 and the second plate frame 2. The sealant groove is provided between the first sealing groove frame 13 and the second sealing strip frame 14 to improve the sealing performance of the bipolar battery. Example 4

[0064] like Fig. 9 As shown, based on the above embodiment, the liquid injection hole 3 is further optimized, and the port is provided with a conical countersunk hole 31 for accommodating the sealing plug 4; the maximum inner diameter of the countersunk hole 31 is greater than the thickness of the first plate frame 1 or the second plate frame 2.

[0065] Specifically, the inner diameter of the injection hole 3 is smaller than the minimum thickness of the plate frame; the injection hole 3 passes through the inner and outer sides of the plate frame; the countersunk hole 31 is conical and matches the end of the sealing plug; the maximum inner diameter of the countersunk hole 31 is larger than the thickness of the first plate frame 1 or the second plate frame 2; three adjacent plate frames are stacked to form a complete countersunk hole 31. Example 5

[0066] like Fig.10 As shown, based on the above embodiment, a further optimization is performed, in which a mounting hole 71 for accommodating the first spring 9 and the sealing plug 4 is provided on the bottom surface of the pressure plate 7 .

[0067] Specifically, the sealing frame adopts two rows of injection holes, each plate frame is designed to be thinner, and the gap between each row of injection holes is smaller, so that more plate frames of the same size can be stacked; in order to adapt to a sufficient number of sealing plugs, two pressing plates 7 are used, and the gap between the mounting holes 71 on each pressing plate 7 is the same as the gap between the rows of injection holes. Example 6

[0068] like Fig.12 As shown, based on the above embodiment, a boss 49 is provided on the top of the elastic plug 42 , and the boss 49 is matched with the recessed groove on the bottom surface of the mounting plate 43 .

[0069] Specifically, the boss 49 is an original platform; there is a perforation in the center; a circular groove is designed on the bottom surface of the mounting plate 43 to cooperate with the boss 49, and the boss 49 is embedded in the groove to improve the sealing between the elastic plug 42 and the mounting plate 43.

[0070] Based on the above embodiment, the maximum outer diameter of the elastic plug 42 is further optimized and is not larger than the diameter of the mounting plate 43 . Example 7

[0071] like Fig.13As shown, an explosion-proof structure of a bipolar battery using a sealing plug of any of the above embodiments is used, wherein the sealing plug blocks the injection hole 3 on the sealing frame of the bipolar battery; a first spring 9 is sleeved on the hollow shaft 44; the upper end of the first spring 9 is pressed through the mounting hole 71 of the pressing plate 7; and the pressing plate 7 is connected to the bipolar battery housing.

[0072] The specific working principle of the present invention is:

[0073] In the technical solution, two sealing frames are staggered and stacked. The two sealing frames have the same size and the injection holes are located at different positions, so that the finally formed sealing frame constitutes more than two rows of injection holes. The injection holes are staggered and do not interfere with each other. The thickness of the plate frame can be further reduced, and the number of stacked plate frames per unit volume is greater, while ensuring that the sealing plugs in the injection holes can be installed normally; there are more battery cells, thereby improving the energy density and power density of the bipolar battery.

[0074] When excess gas is generated in the battery cavity during charging, when the excess gas pressure is greater than the pressure of the first spring 9, the sealing plug 4 will be pushed open and discharged; when the first spring 9 fails or the sealing plug and the injection hole cannot be opened normally due to adhesion, the high-pressure gas will push open the plug 46 and be discharged from the exhaust hole 45, thereby achieving secondary pressure relief, thereby improving the explosion-proof performance of the battery. The pressure of the second spring 47 can be adjusted by rotating the set screw 48.

[0075] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0076] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the methods and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A sealing structure for a bipolar battery, characterized in that: The sealing frame is composed of a first plate frame (1) and a second plate frame (2) which are stacked in an alternating manner; the injection holes (3) of the first plate frame (1) and the second plate frame (2) are respectively located at different positions, so that more than two rows of injection holes (3) are formed on the stacked sealing frame, the injection holes (3) are arranged in an alternating manner without interfering with each other, and each battery cell corresponds to one injection hole (3); and the ports of the injection holes (3) are provided with sealing plugs (4); The sealing plug (4) comprises a mounting plate (43), the bottom end of which is provided with a support tube (41), the top end of which is provided with a hollow shaft (44) for sleeve-connecting a first spring (9), the top end of which is provided with a pressing plate (7); the top end of the support tube (41) is connected to the hollow shaft (44); the support tube (41) is sleeved with an elastic plug head (42) for blocking the injection hole (3); the side wall of the hollow shaft (44) is provided with an exhaust hole (45) connected to the inner cavity of the hollow shaft (44); the hollow shaft (44) is provided with a plug (46) for blocking the bottom port, the top end of the plug (46) is provided with a second spring (47), and the second spring (47) is pressed by a set screw (48); the set screw (48) is threadedly connected in the hollow shaft (44); the sealing plugs are designed in two or more rows and are arranged in the injection hole (3) of the sealing frame, and each sealing plug works independently; The liquid injection hole (3) is provided with a conical countersunk hole (31) for accommodating a sealing plug (4); the maximum inner diameter of the countersunk hole (31) is greater than the thickness of the first plate frame (1) or the second plate frame (2); The support tube (41), the mounting plate (43) and the hollow shaft (44) are an integrated structure and are coaxially arranged with each other; The elastic plug (42) is in the shape of a cone, with a through hole at the center for sleeve connection on the support tube (41); the top end of the elastic plug (42) is closely arranged on the mounting plate (43); The top end of the elastic plug (42) is provided with a boss (49), and the boss (49) is arranged in cooperation with a recessed groove on the bottom surface of the mounting plate (43).

2. A sealing structure for a bipolar battery according to claim 1, characterized in that: The first plate frame (1) and the second plate frame (2) are both provided with a first notch (11) and a second notch (12) on their sides; the injection hole (3) of the first plate frame (1) is located in the first notch (11); the injection hole (3) of the second plate frame (2) is located in the second notch (12); and a pressing plate (7) is provided on the first notch (11) and the second notch (12) to press the sealing plug (4).

3. A sealing structure for a bipolar battery according to claim 1, characterized in that: The first plate frame (1) and the second plate frame (2) are sheet-like rectangular frame structures, with a first sealing groove frame (13) and a second sealing strip frame (14) provided on one side, and a first sealing strip frame (15) and a second sealing groove frame (16) provided on the other side; the first sealing groove frame (13) cooperates with the first sealing strip frame (15); and the second sealing strip frame (14) cooperates with the second sealing groove frame (16).

4. A sealing structure for a bipolar battery according to claim 1, characterized in that: The maximum outer diameter of the elastic plug (42) is no greater than the diameter of the mounting plate (43).

5. A sealing structure for a bipolar battery according to claim 1, characterized in that: A mounting hole (71) for accommodating the first spring (9) and the sealing plug is provided on the bottom surface of the pressure plate (7).

6. An explosion-proof structure of a bipolar battery, characterized in that: The sealing structure according to any one of claims 1 to 5 is adopted, the sealing plug (4) is used to block the injection hole (3) on the sealing frame of the bipolar battery; the first spring (9) is sleeved on the hollow shaft (44); the upper end of the first spring (9) is pressed through the mounting hole (71) of the pressing plate (7); and the pressing plate (7) is connected to the bipolar battery housing.

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