Battery liquid injection device

Abstract

The utility model relates to a battery liquid injection device, and belongs to the technical field of battery liquid injection, the battery liquid injection device comprises a bell jar assembly, the bell jar assembly comprises a bottom shell and a cover shell, and the cover shell detachably covers the bottom shell; the sealing assembly comprises a sealing ring and an air inflation connector, an annular groove is formed in the sealing ring, an air inflation cavity is formed by the annular groove and the cover shell or the bottom shell, and the air inflation cavity is connected with an air source through the air inflation connector for air inflation so that the sealing ring can be connected with the cover shell and the bottom shell in a sealed mode. Sealing and separation between the bottom shell and the cover shell can be achieved by inflating and deflating the sealing ring. During sealing, the sealing ring is inflated to abut against the end face of a component needing to be sealed, and sealing effectiveness is guaranteed. And during separation, the sealing ring is deflated and recovered to normal pressure, so that the housing is convenient to open. Sealing is achieved in an inflation expansion mode, the abrasion loss of the end face of the sealing ring can be compensated, it is guaranteed that the sealing ring is not prone to failure, and the sealing performance and the service life of the sealing ring are effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery liquid injection, and in particular to a battery liquid injection device. Background Art

[0002] The battery filling process is an important technical link in battery production. The quality of the filling process will directly affect the battery yield. During the filling process, a battery filling device is needed to inject the electrolyte into the battery cavity so that part of the electrolyte infiltrates the inside of the battery cell (composed of positive and negative electrodes and diaphragms), and the other part occupies the unfilled space.

[0003] In the related art, a bell jar unit with authorization announcement number CN218493981U and a bell jar self-locking fully sealed high-pressure isobaric box and battery filling system with authorization announcement number CN218770009U both disclose the use of upper and lower parts sealed together to form a pressurizable container to provide a high-pressure environment for battery filling. However, the containers are sealed with a simple sealing ring structure. When filling batteries of different batches, the containers are frequently opened and closed, and the sealing ring structure is prone to wear and failure.

[0004] Therefore, it is necessary to study and improve the above structure and provide a battery injection device in order to achieve a more practical purpose. Summary of the invention

[0005] The embodiment of the present application provides a battery filling device to solve the problem that the sealing structure of the pressurized container for battery filling in the related art is simple and easy to fail.

[0006] The present application provides a battery liquid injection device, comprising:

[0007] A bell housing assembly, comprising a bottom housing and a cover housing, wherein the cover housing can be detachably covered on the bottom housing;

[0008] The sealing assembly includes a sealing ring and an inflation joint. The sealing ring is provided with an annular groove. The annular groove and the cover shell or the bottom shell form an inflation cavity. The inflation cavity is connected to an air source through the inflation joint to inflate so that the sealing ring seals and connects the cover shell and the bottom shell.

[0009] In some embodiments, annular flanges are provided on both inner and outer walls of the sealing ring, and the sealing ring is embedded in the cover shell or the bottom shell through the annular flanges on both sides.

[0010] In some embodiments, a flange ring is further included which is sleeved on the outside of the cover shell and the bottom shell and can rotate around the axis of the cover shell and the bottom shell. When the flange ring is rotated to a first position, the bottom shell and the cover shell are locked, and when it is rotated to a second position, the bottom shell and the cover shell are unlocked.

[0011] In some embodiments, the sealing ring includes an upper sealing ring provided on the bottom shell for abutting the cover shell, and a lower sealing ring provided on the bottom shell for abutting the flange ring, and the upper sealing ring and the lower sealing ring respectively form an upper inflation cavity and a lower inflation cavity connected to the inflation joint with the bottom shell.

[0012] Some embodiments further include a base, the bottom shell is mounted on the base, a first driving component for driving the flange ring to switch between a first position and a second position, and a supporting component for supporting the rotational movement of the flange ring are mounted on the base.

[0013] In some embodiments, a second driving component for driving the cover to be raised and lowered, and a guiding component for guiding the lifting movement of the cover are mounted on the base.

[0014] In some embodiments, a lower tray for carrying batteries and an upper tray for carrying cups filled with electrolyte are further included, wherein the upper tray is arranged opposite to the lower tray so that the discharge head of the cup is aligned with the liquid filling port of the battery.

[0015] In some embodiments, the drainage head of the sleeve cup passes through the upper tray, the top surface of the upper tray is connected to an end plate through a support, the sleeve cup is connected to a conduit passing through the end plate, and an elastic member is connected between the end plate and the sleeve cup to make the drainage head press against the battery filling port.

[0016] In some embodiments, the upper tray is detachably connected to the lower tray via a hook assembly;

[0017] The hook assembly comprises a hook and a latching position, the hook is rotatably connected to the upper tray, and the latching position is arranged on the upper tray.

[0018] In some embodiments, a bracket for supporting the lower tray is disposed on the bottom shell, and a rolling body for the lower tray to slide into is mounted on the bracket.

[0019] The beneficial effects of the technical solution provided by this application include:

[0020] An embodiment of the present application provides a battery liquid filling device, which has a bell cover assembly, including a bottom shell and a cover shell, and the cover shell can be detachably covered on the bottom shell; a sealing assembly, which includes a sealing ring and an inflation joint, and the sealing ring is provided with an annular groove, and the annular groove and the cover shell or the bottom shell form an inflation chamber, and the inflation chamber is connected to an air source through the inflation joint to inflate the cover shell and the bottom shell to seal the connection.

[0021] Therefore, the sealing and separation between the bottom shell and the cover shell can be achieved by inflating and deflating the sealing ring. When sealing, the sealing ring is inflated to press against the end face of the component to be sealed to ensure the effectiveness of the seal. When separating, the sealing ring is deflated and restored to normal pressure to facilitate the opening of the cover shell. The use of inflation to seal can compensate for the wear of the end face of the sealing ring, ensure that the sealing ring is not prone to failure, and effectively improve the sealing performance and service life of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments 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 A schematic diagram of the structure of a bell housing assembly provided in an embodiment of the present application;

[0024] Figure 2 for Figure 1 A partial enlarged view of an embodiment;

[0025] Figure 3 for Figure 1 A is a partial enlarged view of another embodiment;

[0026] Figure 4 A schematic diagram of the structure of a battery liquid injection device provided in an embodiment of the present application;

[0027] Figure 5 A schematic diagram of the positions of the upper tray and the lower tray provided in an embodiment of the present application;

[0028] Figure 6 A schematic diagram of the structure of a hook assembly provided in an embodiment of the present application;

[0029] Figure 7 A schematic diagram of the structure of the bracket provided in an embodiment of the present application.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1. bottom shell; 101. vent pipe; 2. cover shell; 201. second convex tooth; 3. sealing ring; 301. annular groove; 4. inflatable joint; 5. annular flange; 6. flange ring; 61. first convex tooth;

[0032] 31. upper sealing ring; 32. lower sealing ring; 311. upper inflation chamber; 321. lower inflation chamber;

[0033] 7. base; 8. first driving component; 9. supporting component; 10. second driving component; 11. guide component; 111. guide column; 112. sliding sleeve; 113. top plate;

[0034] 12. Lower tray; 121. Limit block; 13. Upper tray; 14. Cup; 141. Drain head; 142. Conduit; 15. Pillar; 16. End plate; 17. Elastic member; 18. Hook assembly; 181. Hook; 182. Positioning; 183. Return spring; 19. Bracket; 191. Rolling element. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] The embodiment of the present application provides a battery filling device, which can solve the problem that the sealing structure of the pressurized container for battery filling in the related art is simple and easy to fail.

[0037] See also Figure 1 and Figure 2 As shown, the embodiment of the present application provides a battery liquid injection device, comprising:

[0038] The bell housing assembly comprises a bottom housing 1 and a cover housing 2, wherein the cover housing 2 can be detachably covered on the bottom housing 1;

[0039] The sealing assembly includes a sealing ring 3 and an inflation connector 4. The sealing ring 3 is provided with an annular groove 301. The annular groove 301 and the cover shell 2 or the bottom shell 1 form an inflation cavity. The inflation cavity is connected to the air source through the inflation connector 4 to inflate so that the sealing ring 3 can seal and connect the cover shell 2 and the bottom shell 1.

[0040] The air-filled cavity in the sealing ring 3 of the sealing assembly of the embodiment of the present application is formed by the annular groove 301 on the sealing ring 3 and the cover shell 2 or the bottom shell 1. Specifically, when the sealing ring 3 is embedded in the bottom shell 1, the annular groove 301 on the sealing ring 3 can form an air-filled cavity with the bottom shell 1, and when the sealing ring 3 is embedded in the cover shell 2, the annular groove 301 on the sealing ring 3 can form an air-filled cavity with the cover shell 2, and the air-filled cavity cooperates with the air-filling joint 4 to realize inflation and deflation.

[0041] For example, in this embodiment, the sealing ring 3 is embedded in a groove opened on the top surface of the bottom shell 1, and the bottom wall of the groove and the annular groove 301 on the sealing ring 3 form an inflation chamber, and the inflation chamber is connected to the inflation connector 4 installed on the bottom shell 1. When the cover shell 2 is covered on the bottom shell 1 and the two are locked together, since the cover shell 2 presses the sealing ring 3, air can be inflated into the inflation chamber through the inflation connector 4. The gas can stay in the inflation chamber and make the sealing ring 3 expand to press against the bottom end surface of the cover shell 2, thereby achieving effective sealing.

[0042] When the cover 2 and the bottom shell 1 need to be unlocked and separated, the gas in the inflation cavity is discharged through the inflation joint 4, so that the inflation cavity returns to the same normal pressure as the outside, and then the cover 2 can be operated to open. The sealing is achieved by inflation, which can compensate for the wear of the end face of the sealing ring 3, ensure that the sealing ring 3 is not easy to fail, and effectively improve the sealing performance and service life of the sealing ring 3.

[0043] In some alternative embodiments: See Figure 1 and Figure 2 As shown, an embodiment of the present application provides a battery filling device, in which annular flanges 5 are provided on the inner and outer walls of a sealing ring 3 of the battery filling device, and the sealing ring 3 is embedded in the cover shell 2 or the bottom shell 1 through the annular flanges 5 on both sides.

[0044] The sealing ring 3 of the embodiment of the present application has an annular flange 5 integrally formed on both the inner and outer walls. After the sealing ring 3 is embedded and installed, the annular flange 5 can improve the sealing performance of the inflation chamber when it is inflated. For example, in the present embodiment, the sealing ring 3 is embedded in the groove provided on the top surface of the bottom shell 1, and the groove is provided with a space adapted to the annular flanges 5 on both sides of the sealing ring 3. When the inflation chamber formed by the sealing ring 3 and the bottom wall of the groove is inflated, the annular flange 5 on the sealing ring 3 will press against the wall surface of the groove, effectively preventing gas from leaking from between the sealing ring 3 and the groove, thereby ensuring the effectiveness of the seal.

[0045] In some alternative embodiments: See Figure 1 , Figure 3 and Figure 7 As shown, an embodiment of the present application provides a battery filling device, which also includes a flange ring 6 which is sleeved on the outside of the cover shell 2 and the bottom shell 1 and can rotate around the axis of the cover shell 2 and the bottom shell 1. When the flange ring 6 is rotated to a first position, the bottom shell 1 and the cover shell 2 are locked, and when it is rotated to a second position, the bottom shell 1 and the cover shell 2 are unlocked.

[0046] The flange ring 6 of the embodiment of the present application is used to lock or unlock the bottom shell 1 and the cover shell 2. Exemplarily, in this embodiment, the bottom surface of the bottom shell 1 abuts against the bottom wall of the inner ring groove of the flange ring 6, and a plurality of first protruding teeth 61 are arranged at intervals on the inner side of the flange ring 6, and a plurality of second protruding teeth 201 are arranged at intervals on the outer side of the cover shell 2.

[0047] The second protruding teeth 201 can pass through the gap formed by the first protruding teeth 61, so that the cover shell 2 can be moved down to cover the bottom shell 1. When the cover shell 2 is covered on the bottom shell 1, the flange ring 6 is rotated to move the first protruding teeth 61 to the top of the second protruding teeth 201 (corresponding to the first position), thereby locking the bottom shell 1 and the cover shell 2. When unlocking is required, the flange ring 6 is rotated to reset the first protruding teeth 61 (corresponding to the second position), and the cover shell 2 can be moved up to move the second protruding teeth 201 out of the gap formed by the first protruding teeth 61.

[0048] In some alternative embodiments: See Figure 1 and Figure 3 As shown, an embodiment of the present application provides a battery filling device, wherein the sealing ring 3 of the battery filling device includes an upper sealing ring 31 provided on the bottom shell 1 for abutting the cover shell 2, and a lower sealing ring 32 provided on the bottom shell 1 for abutting the flange ring 6, the upper sealing ring 31 and the lower sealing ring 32 respectively form an upper inflation cavity 311 and a lower inflation cavity 321 connected to the inflation connector 4 with the bottom shell 1.

[0049] Since the embodiment of the present application is provided with a flange ring 6 for locking or unlocking the bottom shell 1 and the cover shell 2, in order to improve the sealing between the cover shell 2 and the bottom shell 1 when the flange ring 6 is locked, an upper sealing ring 31 and a lower sealing ring 32 are respectively embedded in the upper and lower end surfaces of the base through grooves, and the upper sealing ring 31 and the lower sealing ring 32 respectively form an upper inflation chamber 311 and a lower inflation chamber 321 with the bottom shell 1, and the upper inflation chamber 311 and the lower inflation chamber 321 are connected to an external air source through an inflation joint 4.

[0050] When in use, when the flange ring 6 locks the cover shell 2 and the bottom shell 1, the upper inflation chamber 311 and the lower inflation chamber 321 are inflated simultaneously through the inflation joint 4, and the gas stays in the upper inflation chamber 311 and the lower inflation chamber 321, and the upper sealing ring 31 expands to press against the bottom end surface of the cover shell 2, thereby ensuring the sealing of the cover shell 2 and the bottom shell 1. At the same time, the lower sealing ring 32 expands to press against the inner bottom wall of the flange ring 6, so that the first convex teeth 61 on the flange ring 6 press the cover shell 2 downward, thereby further improving the sealing of the cover shell 2 and the bottom shell 1.

[0051] In some alternative embodiments: See Figure 1 and Figure 4 As shown, an embodiment of the present application provides a battery filling device, which also includes a base 7, a bottom shell 1 is installed on the base 7, a first driving component 8 for driving the flange ring 6 to switch between the first position and the second position, and a supporting component 9 for supporting the rotational movement of the flange ring 6 are installed on the base 7.

[0052] The first driving component 8 of the embodiment of the present application can drive the flange ring 6 to rotate to achieve unlocking or locking of the cover shell 2 and the bottom shell 1. For example, in the present embodiment, the first driving component 8 can be a pneumatic or electric telescopic cylinder, and the two ends of the telescopic cylinder are respectively hinged on the base 7 and the flange ring 6 through a connecting seat, so that when the telescopic cylinder is extended and retracted, it can drive the flange ring 6 to rotate a certain angle, thereby correspondingly unlocking or locking the cover shell 2 and the bottom shell 1.

[0053] In addition, further, a support component 9 is installed on the base 7, and the support component 9 can improve the stability of the flange ring 6 during rotation. Exemplarily, in this embodiment, the support component 9 can be a roller or a slider with a smooth surface, and a plurality of support components 9 can be arranged and distributed in an annular shape on the base 7 to achieve stable support for the flange ring 6, while not affecting the first driving component 8 to drive the flange ring 6 to rotate.

[0054] In some alternative embodiments: See Figure 1 and Figure 4 As shown, an embodiment of the present application provides a battery filling device, on which a second driving component 10 for driving the cover shell 2 to rise and fall, and a guide component 11 for guiding the lifting movement of the cover shell 2 are installed.

[0055] The second driving component 10 of the embodiment of the present application can drive the cover shell 2 to rise when the cover shell 2 is unlocked from the bottom shell 1, so as to separate the cover shell 2 from the bottom shell 1. Exemplarily, the second driving component 10 can be a pneumatic or electric telescopic cylinder, the bottom end of the telescopic cylinder is fixedly mounted on the base 7, and the telescopic end of the telescopic cylinder is fixedly mounted on the cover shell 2. In this example, when the flange ring 6 is in the unlocked state, the telescopic cylinder can drive the cover shell 2 to move upward, and the second protruding teeth 201 on the side wall of the cover shell 2 can be moved out from the gap formed by the adjacent first protruding teeth 61 on the flange ring 6, so as to separate the cover shell 2 from the bottom shell 1.

[0056] In addition, further, a guide component 11 is installed on the base 7, and the guide component 11 can improve the stability of the cover shell 2 when it is lifted. Exemplarily, the guide component 11 includes a guide column 111 and a sliding sleeve 112 that is slidably mounted on the guide column 111. When installed, the guide column 111 is vertically fixed on the base 7, and the sliding sleeve 112 on the guide column 111 is fixedly connected to the cover shell 2. In this embodiment, in order to improve the stability of the lifting guide, four guide columns 111 are provided, and the four guide columns 111 are distributed in a rectangular shape, and the top ends of the four guide columns 111 are connected to a top plate 113.

[0057] In some alternative embodiments: See Figures 4 to 7As shown, an embodiment of the present application provides a battery filling device, which also includes a lower tray 12 for carrying batteries and an upper tray 13 for carrying a sleeve cup 14 filled with electrolyte, and the upper tray 13 is arranged opposite to the lower tray 12 so that the discharge head 141 of the sleeve cup 14 is aligned with the filling port of the battery.

[0058] The lower tray 12 of the embodiment of the present application is used to carry batteries. Furthermore, in order to prevent the batteries from shifting or tilting sideways, a limit block 121 with a battery slot is installed on the lower tray 12 to facilitate the insertion of batteries through the battery slot so that the batteries can be neatly constrained on the lower tray 12.

[0059] In addition, the upper tray 13 is arranged above the lower tray 12, and a sleeve cup 14 filled with electrolyte is installed on the upper tray 13. In this example, by fixing the relative positions of the upper tray 13 and the lower tray 12, the discharge head 141 of the sleeve cup 14 can be aligned with the filling port of the battery, so that when it is subsequently placed in the cover shell 2 and the bottom shell 1, the sleeve cup 14 can be used to fill the battery under a pressurized environment.

[0060] In some alternative embodiments: See Figure 5 As shown, an embodiment of the present application provides a battery filling device, in which a discharge head 141 of a sleeve cup 14 of the battery filling device penetrates an upper tray 13, a top surface of the upper tray 13 is connected to an end plate 16 via a support 15, a conduit 142 penetrating the end plate 16 is connected to the sleeve cup 14, and an elastic member 17 is connected between the end plate 16 and the sleeve cup 14 to hold the discharge head 141 against the battery filling port.

[0061] The drain head 141 of the sleeve cup 14 of the embodiment of the present application is slidably matched with the upper tray 13, the upper conduit 142 of the sleeve cup 14 is slidably matched with the end plate 16, and the upper tray 13 and the end plate 16 are fixedly connected by a column. Under the premise that the upper tray 13 and the lower tray 12 are fixed in relative position and the drain head 141 of the sleeve cup 14 is aligned with the liquid injection port of the battery, under the elastic force of the elastic member 17, the sleeve cup 14 can drive the drain head 141 to press against the liquid injection port of the battery, thereby ensuring the sealing of the connection between the drain head 141 and the liquid injection port. Exemplarily, the elastic member 17 is a spring, and the spring sleeve is installed on the conduit 142.

[0062] It should be noted that, in this embodiment, the top of the sleeve cup 14 is connected to two conduits 142. During the liquid injection preparation stage, one of the conduits 142 is used to connect to the air tightness test station, and the other is used to connect to the liquid injection station. When the two conduits 142 are connected at the same time, the liquid injection station closes the connected conduits 142, and the air tightness test station vacuums the sleeve cup 14 and the battery connected to the sleeve cup 14 to verify the sealing of the connection between the liquid discharge head 141 and the liquid injection port.

[0063] When the sealing of the connection between the discharge head 141 and the injection port meets the requirements, the airtightness detection station stops vacuuming, and controls the injection station to inject electrolyte into the sleeve cup 14 using the conduit 142. Finally, the battery and the sleeve cup 14 are moved as a whole into the cavity formed by the cover shell 2 and the bottom shell 1, and the cavity is pressurized through the vent pipe 101 on the bottom shell 1, and then the battery is pressurized and injected and soaked.

[0064] In some alternative embodiments: See Figure 6 As shown, the embodiment of the present application provides a battery filling device, in which the upper tray 13 of the battery filling device is detachably connected to the lower tray 12 through a hook assembly 18;

[0065] The hook assembly 18 includes a hook 181 and a latching position 182 . The hook 181 is rotatably connected to the upper tray 13 , and the latching position 182 is disposed on the upper tray 13 .

[0066] The upper tray 13 of the embodiment of the present application is detachably connected to the lower tray 12 through the hook assembly 18, so as to realize the relative position fixation of the upper tray 13 and the lower support plate. In this example, the hook assembly 18 includes a hook 181 hinged on the upper tray 13 and a clamping position 182 installed on the upper tray 13, and the upper end of the hook 181 can be buckled on the clamping position 182 to ensure that the relative position of the upper tray 13 and the lower support plate is fixed. Furthermore, a reset spring 183 is connected between the lower end of the hook 181 and the lower tray 12, and under the elastic thrust of the reset spring 183, it can ensure that the upper end of the hook 181 is stably maintained on the clamping position 182 and is not easy to slip off.

[0067] In some alternative embodiments: See Figure 7 As shown, an embodiment of the present application provides a battery filling device, wherein a bracket 19 for supporting a lower tray 12 is disposed on a bottom shell 1 of the battery filling device, and a rolling body 191 for the lower tray 12 to slide into is mounted on the bracket 19 .

[0068] A bracket 19 is installed on the bottom shell 1 of the embodiment of the present application. The bracket 19 can be used to place two or more layers of lower trays 12 with batteries. Furthermore, a rolling body 191 is installed on the bracket 19. In this example, the rolling body 191 is a roller and is installed at intervals along the sliding path of the lower tray 12, so that the lower tray 12 can be slid into the bracket 19, making it convenient to take and place the lower tray 12.

[0069] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are 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 on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the 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 the specific circumstances.

[0070] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including 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 device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0071] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A battery filling device, characterized in that: include: A bell housing assembly, comprising a bottom housing (1) and a cover housing (2), wherein the cover housing (2) is detachably covered on the bottom housing (1); A sealing assembly comprises a sealing ring (3) and an inflation joint (4); the sealing ring (3) is provided with an annular groove (301); the annular groove (301) and a cover shell (2) or a bottom shell (1) form an inflation cavity; the inflation cavity is connected to an air source through the inflation joint (4) for inflation so that the sealing ring (3) is hermetically connected to the cover shell (2) and the bottom shell (1).

2. The battery liquid injection device according to claim 1, characterized in that: Annular flanges (5) are provided on the inner and outer walls of the sealing ring (3), and the sealing ring (3) is embedded in the cover shell (2) or the bottom shell (1) through the annular flanges (5) on both sides.

3. The battery liquid injection device according to claim 1, characterized in that: It also comprises a flange ring (6) which is sleeved on the outside of the cover shell (2) and the bottom shell (1) and can rotate around the axis of the cover shell (2) and the bottom shell (1); when the flange ring (6) is rotated to a first position, it locks the bottom shell (1) and the cover shell (2); and when it is rotated to a second position, it unlocks the bottom shell (1) and the cover shell (2).

4. The battery liquid injection device according to claim 3, characterized in that: The sealing ring (3) comprises an upper sealing ring (31) provided on the bottom shell (1) for abutting against the cover shell (2), and a lower sealing ring (32) provided on the bottom shell (1) for abutting against the flange ring (6), wherein the upper sealing ring (31) and the lower sealing ring (32) respectively form an upper inflation cavity (311) and a lower inflation cavity (321) communicating with the inflation joint (4) with the bottom shell (1).

5. The battery liquid injection device according to claim 3, characterized in that: The invention also comprises a base (7), the bottom shell (1) is mounted on the base (7), and a first driving component (8) for driving the flange ring (6) to switch between a first position and a second position, and a supporting component (9) for supporting the rotational movement of the flange ring (6) are mounted on the base (7).

6. The battery liquid injection device according to claim 5, characterized in that: The base (7) is provided with a second driving component (10) for driving the cover shell (2) to rise and fall, and a guiding component (11) for guiding the rising and falling movement of the cover shell (2).

7. The battery liquid injection device according to claim 1, characterized in that: It also comprises a lower tray (12) for carrying batteries and an upper tray (13) for carrying a sleeve cup (14) filled with electrolyte, wherein the upper tray (13) and the lower tray (12) are arranged opposite to each other so that the discharge head (141) of the sleeve cup (14) is aligned with the liquid injection port of the battery.

8. The battery liquid injection device according to claim 7, characterized in that: The drain head (141) of the sleeve cup (14) passes through the upper tray (13); the top surface of the upper tray (13) is connected to an end plate (16) via a support (15); the sleeve cup (14) is connected to a conduit (142) passing through the end plate (16); an elastic member (17) is connected between the end plate (16) and the sleeve cup (14) to enable the drain head (141) to press against the battery liquid filling port.

9. The battery liquid injection device according to claim 7, characterized in that: The upper tray (13) is detachably connected to the lower tray (12) via a hook assembly (18); The hook assembly (18) comprises a hook (181) and a latching position (182); the hook (181) is rotatably connected to the upper tray (13); and the latching position (182) is arranged on the upper tray (13).

10. The battery liquid injection device according to claim 7, characterized in that: The bottom shell (1) is provided with a bracket (19) for supporting the lower tray (12), and the bracket (19) is provided with a rolling body (191) for the lower tray (12) to slide into.

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