Battery liquid injection clamp

Abstract

The utility model discloses a battery liquid injection clamp which comprises a tray assembly, a liquid injection assembly and a liquid injection assembly, the tray assembly comprises a box body and a plurality of lining modules, limiting cavities are formed in the lining modules, battery cells are placed in the limiting cavities, and liquid injection openings are formed in the tops of the battery cells; the cup sleeving assembly is arranged above the tray assembly and comprises a first bottom plate and a plurality of liquid injection cups arranged on the first bottom plate, a first through hole and a second through hole are formed in the top of each liquid injection cup, a liquid injection nozzle is arranged at the bottom of each liquid injection cup, a one-way valve is installed in each first through hole, each second through hole is plugged through a plugging module, and the liquid injection nozzles are communicated with the first through hole. The liquid injection nozzle penetrates through the first bottom plate and corresponds to the liquid injection port; and the locking assembly is used for locking the retainer cup assembly and the tray assembly. The battery electrolyte injection fixture can greatly improve the absorption and infiltration effect of electrolyte in a battery cell, avoids the phenomenon of electrolyte leakage of an electrolyte injection port of the battery cell, and also has a pressure maintaining function in the transportation process.

Description

Technical Field

[0001] The utility model relates to the technical field of battery liquid injection, and particularly relates to a battery liquid injection jig. Background Art

[0002] During the production process of lithium batteries, a liquid injection machine and a liquid injection jig are required to inject liquid into the battery cells. The existing liquid injection jig includes a tray and a sleeve cup. The battery cell is placed on the tray, and the sleeve cup is arranged above the battery cell. The top of the sleeve cup is provided with a liquid inlet and a vacuum pumping port, the bottom of the sleeve cup is provided with a liquid injection nozzle, and the top of the battery cell is provided with a liquid injection port. The liquid injection nozzle is communicated with the liquid injection port, and the electrolyte is injected into the battery cell through the sleeve cup.

[0003] It is difficult for the battery cell to absorb the electrolyte under natural conditions. Therefore, after the liquid injection is completed, the breathing component of the liquid injection machine pressurizes or evacuates the inside of the sleeve cup, so that the battery cell absorbs and infiltrates the electrolyte under high pressure or high vacuum conditions.

[0004] However, the existing sleeve cup has poor pressure maintaining performance, resulting in poor absorption and infiltration effect of the electrolyte in the battery cell. The battery cell is prone to the phenomenon of liquid overflow from the liquid injection port, thereby affecting the liquid injection accuracy and directly affecting the charge and discharge performance of the battery cell. Summary of the Utility Model

[0005] In order to overcome the deficiencies of the prior art, the utility model provides a battery liquid injection jig, which greatly improves the absorption and infiltration effect of the electrolyte in the battery cell, avoids the phenomenon of liquid overflow from the liquid injection port of the battery cell, and moreover, enables the battery liquid injection jig to have a pressure maintaining function during transportation.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A battery liquid injection fixture, comprising: a tray assembly for clamping battery cells, including a box body and a plurality of lining modules. The top of the box body is open, and a plurality of accommodating cavities are arranged in the box body. The plurality of accommodating cavities respectively accommodate the plurality of lining modules. A limiting cavity is arranged in the lining module, and the battery cell is placed in the limiting cavity. A liquid injection port is arranged at the top of the battery cell; a cup assembly for loading electrolyte, arranged above the tray assembly, including a first bottom plate and a plurality of liquid injection cups arranged on the first bottom plate. A first through hole and a second through hole are opened at the top of the liquid injection cup. The first through hole is used for injecting high-pressure gas or extracting vacuum, and the second through hole is used for injecting electrolyte. A liquid injection nozzle is arranged at the bottom of the liquid injection cup. The first through hole is provided with a one-way valve. The liquid injection nozzle penetrates through the first bottom plate and corresponds to the liquid injection port; after the liquid injection is completed, the second through hole is blocked by a blocking module. The breathing assembly of the liquid injection machine opens the one-way valve and injects high-pressure gas or extracts vacuum. After the internal pressure of the liquid injection cup reaches a set value, the one-way valve closes to block the second through hole; a locking assembly for locking the cup assembly and the tray assembly.

[0008] As a further improvement of the above technical solution, the blocking module includes a blocking rod, two buckle assemblies and a plurality of plugs. The plurality of plugs are sequentially arranged on the blocking rod. The two buckle assemblies are respectively arranged on both sides of the first bottom plate, and the two buckle assemblies are respectively used for locking both ends of the blocking rod. The plurality of plugs respectively correspond to the second through holes at the tops of the plurality of liquid injection cups.

[0009] As a further improvement of the above technical solution, the buckle assembly includes a buckle seat, a swing arm, a hook and a compression spring. The buckle seat is arranged on one side of the top of the first bottom plate. The swing arm is connected to the buckle seat through a rotating shaft. The hook is arranged at one end of the swing arm. The compression spring is installed between the buckle seat and the swing arm. The hook is used for clamping the end of the blocking rod.

[0010] As a further improvement of the above technical solution, the buckle seat is provided with a first counterbore, and a second counterbore is arranged at the end of the swing arm away from the hook. One end of the compression spring is installed in the first counterbore, and the other end of the compression spring is installed in the second counterbore.

[0011] As a further improvement of the above technical solution, the locking assembly includes a first limiting hook, a second limiting hook, a guiding push rod and a guiding block. The first limiting hook is arranged on one side of the first bottom plate. The guiding block is fixed on one side of the box body. The guiding push rod is slidably connected to the guiding block. The second limiting hook is installed on the guiding push rod. The guiding push rod is horizontally arranged. Pushing the guiding push rod drives the second limiting hook to engage with or disengage from the first limiting hook.

[0012] As a further improvement of the above technical solution, the guiding block is located on one side of the second limiting hook, and a blocking bolt is arranged on one side of the second limiting hook close to the guiding block. The blocking bolt abuts against the guiding block to position the second limiting hook relative to the first limiting hook.

[0013] As a further improvement of the above technical solution, positioning pins are arranged on both sides of the top of the box body, and positioning holes for accommodating the insertion of the positioning pins are arranged on both sides of the bottom of the first bottom plate.

[0014] As a further improvement of the above technical solution, the box body includes a second bottom plate and a plurality of side plates arranged at the edge of the second bottom plate. The plurality of side plates enclose a closed structure. A plurality of partition plates are arranged in the box body, and the plurality of partition plates and the plurality of side plates form a plurality of accommodating cavities.

[0015] As a further improvement of the above technical solution, threaded holes are arranged at the tops of the side plates and the partition plates, and stop screws are connected to the threaded holes. The nuts of the stop screws are used to lock the tops of the inner lining modules.

[0016] As a further improvement of the above technical solution, the one-way valve includes a valve seat, a valve housing and a valve body. The valve housing is arranged on the valve seat, and the valve body is movably arranged in the valve housing. The valve body and the valve housing enclose a first inner cavity, and the valve seat and the valve housing enclose a second inner cavity. The valve body penetrates through the first inner cavity and the second inner cavity. The valve body is provided with a first channel, one end of the first channel communicates with the top of the valve body, and the valve body moves to drive the other end of the first channel to communicate with the first inner cavity or the second inner cavity. The valve seat is provided with a second channel, and both ends of the second channel communicate with the second inner cavity and the inside of the liquid injection cup respectively. A first compression spring is arranged between the valve body and the valve housing, and a second compression spring is arranged between the valve seat and the valve housing. When the valve body is not affected by external force, the first compression spring and the second compression spring are in a natural extended state, and the other end of the first channel communicates with the first inner cavity. When the valve body is under the action of external pressure, the first compression spring and the second compression spring are compressed, and the valve body descends to drive the other end of the first channel to communicate with the second inner cavity.

[0017] The beneficial effects of the present utility model are as follows: The present utility model provides a battery liquid injection fixture. By setting a one-way valve and a plugging module, the plugging module includes a plug rod, two buckle components and a plurality of plugs. The plurality of plugs on the plug rod can block the second through holes of a plurality of liquid injection cups. The two buckle components are respectively used to lock both ends of the plug rod. High-pressure gas can be introduced or vacuum can be pumped through the one-way valve. Under the action of the one-way valve and the buckle components, the liquid injection cup and the battery cell are completely sealed, so that the air pressure inside the battery cell can be stably maintained at the state before the gas cut-off for a long time. After multiple breathing cycles of high positive pressure or high vacuum, thereby, the absorption and infiltration effect of the electrolyte in the battery cell is greatly improved, and the phenomenon of liquid overflowing from the liquid injection port of the battery cell is avoided. Moreover, the battery liquid injection fixture also has a pressure-holding function during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present utility model will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 is a schematic structural diagram provided by an embodiment of the present utility model;

[0020] Figure 2 is Figure 1 a sectional view of

[0021] Figure 3 is Figure 1 an exploded view of the tray assembly and the sleeve cup assembly in

[0022] Figure 4 is Figure 1 a partial exploded view of the tray assembly in

[0023] Figure 5 is Figure 1 an enlarged view of part A in

[0024] Figure 6 is Figure 1 an enlarged view of part B in

[0025] Figure 7 is Figure 4 an enlarged view of part C in

[0026] Figure 8 is Figure 4 an enlarged view of part D in

[0027] Figure 9 is Figure 2 an enlarged view of part E in

[0028] Figure 10 is Figure 2 a sectional view of the one-way valve in

[0029] Reference numerals: 1 - tray assembly, 11 - battery cell, 12 - box body, 13 - lining module, 111 - liquid injection port, 121 - accommodation cavity, 122 - positioning pin, 123 - second bottom plate, 124 - side plate, 125 - partition plate, 126 - threaded hole, 127 - clearance groove, 128 - pin seat, 131 - limiting cavity;

[0030] 2 - cup assembly, 21 - first bottom plate, 22 - liquid injection cup, 23 - one - way valve, 24 - plugging module, 212 - positioning hole, 221 - first through - hole, 222 - second through - hole, 223 - liquid injection nozzle, 231 - valve seat, 232 - valve housing, 233 - valve body, 234 - first inner cavity, 235 - second inner cavity, 236 - first compression spring, 237 - second compression spring, 238 - sealing ring, 239 - sealing ring pressing piece, 241 - plug rod, 242 - buckle assembly, 243 - plug, 2311 - second channel, 2331 - first channel, 2421 - buckle seat, 2422 - swing arm, 2423 - hook, 2424 - compression spring, 2425 - rotating shaft;

[0031] 3 - locking assembly, 31 - first limiting hook, 32 - second limiting hook, 33 - guiding push rod, 34 - guiding block, 35 - blocking bolt, 36 - mounting block, 37 - limiting block, 311 - first ball, 321 - first groove, 322 - second groove, 361 - second ball. Detailed implementation mode

[0032] The concept, specific structure and technical effects of the present utility model will be clearly and completely described below in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present utility model. In addition, all the connection / connection relationships involved in the patent do not simply refer to the direct connection of components, but refer to the more optimal connection structure that can be formed by adding or reducing connection accessories according to the specific implementation situation. Each technical feature in the creation of the present utility model can be combined interactively without conflicting with each other.

[0033] Referring to Figures 1 to 4 , a battery liquid injection fixture provided by an example of the present utility model includes a tray assembly 1, a cup assembly 2 and a locking assembly 3 for locking the cup assembly 2 and the tray assembly 1.

[0034] Among them, the tray assembly 1 is used for clamping the battery cell 11, and includes a box body 12 and a plurality of inner lining modules 13. The top of the box body 12 is open, and a plurality of accommodating cavities 121 are arranged in the box body 12. The plurality of accommodating cavities 121 respectively accommodate the plurality of inner lining modules 13. A limiting cavity 131 is arranged in the inner lining module 13, and the battery cell 11 is placed in the limiting cavity 131. A liquid injection port 111 is arranged at the top of the battery cell 11.

[0035] Further, the cup assembly 2 is used for loading electrolyte and is arranged above the tray assembly 1. It includes a first bottom plate 21 and a plurality of liquid injection cups 22 arranged on the first bottom plate 21. The first bottom plate 21 is arranged on the top of the box body 12, and the first bottom plate 21 and the box body 12 are locked tightly through a locking assembly 3. A first through hole 221 and a second through hole 222 are opened at the top of the liquid injection cup 22. The first through hole 221 is used for injecting high-pressure gas or extracting vacuum, and the second through hole 222 is used for injecting electrolyte. A liquid injection nozzle 223 is arranged at the bottom of the liquid injection cup 22. A one-way valve 23 is installed in the first through hole 221, and the liquid injection nozzle 223 penetrates through the first bottom plate 21 and corresponds to the liquid injection port 111.

[0036] After the liquid injection is completed, the second through hole 222 is blocked by a blocking module 24.

[0037] Specifically, the blocking module 24 includes a blocking rod 241, two buckle assemblies 242 and a plurality of blocking heads 243. The plurality of blocking heads 243 are sequentially arranged on the blocking rod 241. The two buckle assemblies 242 are respectively arranged on both sides of the first bottom plate 21, and the two buckle assemblies 242 are respectively used for locking the two ends of the blocking rod 241. The plurality of blocking heads 243 respectively correspond to the second through holes 222 at the tops of the plurality of liquid injection cups 22.

[0038] Refer to Figure 6 For more specifically, the buckle assembly 242 includes a buckle seat 2421, a swing arm 2422, a hook 2423 and a compression spring 2424. The buckle seat 2421 is arranged on one side of the top of the first bottom plate 21. The swing arm 2422 is connected to the buckle seat 2421 through a rotating shaft 2425. The hook 2423 is arranged at one end of the swing arm 2422. The buckle seat 2421 is provided with a first counterbore, and the end of the swing arm 2422 away from the hook 2423 is provided with a second counterbore. One end of the compression spring 2424 is installed in the first counterbore, and the other end of the compression spring 2424 is installed in the second counterbore. The first counterbore and the second counterbore can limit the two ends of the compression spring 2424 to prevent the compression spring 2424 from detaching. The hook 2423 is used for clamping the end of the blocking rod 241.

[0039] Before liquid injection, several battery cells 11 are respectively placed into the limiting cavities 131 of several inner lining modules 13. Then, several liquid injection cups 22 are placed on the first bottom plate 21, and the first bottom plate 21 is placed on the top of the box body 12, so that the liquid injection nozzles 223 of the liquid injection cups 22 are aligned with the liquid injection ports 111 of the battery cells 11. Finally, the locking assembly 3 locks the first bottom plate 21 and the box body 12 tightly.

[0040] During liquid injection, a liquid injection device (not shown in the figure) injects electrolyte into the liquid injection cup 22 from the second through hole 222, and then it flows from the liquid injection nozzle 223 into the battery cell 11.

[0041] After liquid injection, a plug rod 241 is placed on the top of the liquid injection cup 22, so that several plugs 243 on the plug rod 241 block the second through holes 222 of several liquid injection cups 22. Then, press one end of the swing arm 2422 away from the hook 2423. At this time, the compression spring 2424 is compressed, and the swing arm 2422 swings to drive the hook 2423 to move outwards. Subsequently, remove the force applied to one end of the swing arm 2422, the compression spring 2424 extends, drives the swing arm 2422 to swing in the reverse direction, and the swing arm 2422 drives the hook 2423 to clamp the end of the plug rod 241. On the one hand, the plug 243 can be pressed tightly on the second through hole 222 of the liquid injection cup 22 to improve the pressure maintaining performance of the sleeve cup. On the other hand, the liquid injection cup 22 can be limited to prevent the liquid injection cup 22 from shifting. Then, a breathing assembly (not shown in the figure) presses down the one-way valve 23, the one-way valve 23 opens, and high positive pressure nitrogen enters the liquid injection cup 22 from the one-way valve 23, and then enters the battery cell 11 from the liquid injection nozzle 223 at the bottom of the liquid injection cup 22, so that the internal pressure of the battery cell 11 can reach a maximum positive pressure of 300 kPa, or the air inside the liquid injection cup 22 is pumped out from the one-way valve 23, so that a maximum vacuum of -100 kPa is generated inside the battery cell 11. Finally, the breathing assembly stops working, the one-way valve 23 closes, and under the action of the one-way valve 23 and the buckle assembly 242, the liquid injection cup 22 and the battery cell 11 are completely sealed, so that the air pressure inside the battery cell 11 is stably maintained at the state before air cut-off for a long time. After multiple high positive pressure or high vacuum breathing cycles, thereby, the absorption and infiltration effect of the electrolyte in the battery cell 11 is greatly improved, and the phenomenon of liquid overflow at the liquid injection port 111 of the battery cell 11 is avoided. Moreover, the battery liquid injection fixture also has a pressure maintaining function during transportation.

[0042] Refer to Figure 5 , in some preferred embodiments, the locking assembly 3 includes a first limiting hook 31, a second limiting hook 32, a guiding push rod 33 and a guiding block 34. The first limiting hook 31 is arranged on one side of the first bottom plate 21, the guiding block 34 is fixed on one side of the box body 12, the guiding push rod 33 is slidably connected with the guiding block 34, the second limiting hook 32 is installed on the guiding push rod 33, the guiding push rod 33 is horizontally arranged, and by pushing the guiding push rod 33, the second limiting hook 32 is driven to engage with or disengage from the first limiting hook 31.

[0043] It can be understood that when the nested cup assembly 2 is placed above the tray assembly 1, the first bottom plate 21 is placed on the top of the box body 12. At this time, when the guiding push rod 33 is pushed, the guiding push rod 33 moves horizontally under the guiding action of the guiding block 34. The guiding push rod 33 drives the second limiting hook 32 to move horizontally and approach the first limiting hook 31. Finally, the second limiting hook 32 is snapped into the first limiting hook 31. Thus, the first bottom plate 21 can be locked with the box body 12 together, ensuring the stability during the liquid injection or breathing process.

[0044] Further, the guiding block 34 is located on one side of the second limiting hook 32. A blocking bolt 35 is arranged on the side of the second limiting hook 32 close to the guiding block 34. When the guiding push rod 33 drives the second limiting hook 32 to move horizontally and approach the first limiting hook 31, one end of the blocking bolt 35 abuts against the guiding block 34, which can limit the second limiting hook 32. Thus, the accuracy of the snap connection between the second limiting hook 32 and the first limiting hook 31 can be improved.

[0045] Refer to Figure 4 、 Figure 5 、 Figure 8 and Figure 9 Furthermore, a first ball 311 and a first groove 321 for accommodating the first ball 311 are also arranged between the first limiting hook 31 and the second limiting hook 32. After the second limiting hook 32 is snapped into the first limiting hook 31, the first ball 311 cooperates with the first groove 321. Thus, the second limiting hook 32 is prevented from disengaging from the first limiting hook 31, improving the firmness of the locking.

[0046] It should be noted that the first ball 311 can be arranged on the first limiting hook 31 or on the second limiting hook 32. The embodiment of the present utility model does not make specific limitations.

[0047] Specifically, when the first ball 311 is arranged on the first limiting hook 31, the first groove 321 is arranged on the second limiting hook 32; when the first ball 311 is arranged on the second limiting hook 32, the first groove 321 is arranged on the first limiting hook 31.

[0048] Even further, an installation block 36 is also arranged on the side of the box body 12. The installation block 36 is located above the second limiting hook 32. A second ball 361 is arranged at the bottom of the installation block 36. A second groove 322 is arranged at the top of the second limiting hook 32. After the second limiting hook 32 is disengaged from the first limiting hook 31, the second limiting hook 32 moves to directly below the installation block 36, and the second ball 361 at the bottom of the installation block 36 is snapped into the second groove 322 at the top of the second limiting hook 32. Thus, the guiding push rod 33 is prevented from disengaging from the guiding block 34.

[0049] To further limit the movement range of the guiding push rod 33, a limiting block 37 is also provided on the side of the box body 12. The limiting block 37 is located on the side of the second limiting hook 32 away from the guiding block 34. After the second limiting hook 32 is disengaged from the first limiting hook 31, the limiting block 37 blocks the further movement of the second limiting hook 32, ensuring that the guiding push rod 33 is always slidably connected to the guiding block 34.

[0050] Referring to Figure 3 , in some preferred embodiments, positioning pins 122 are provided on both sides of the top of the box body 12, and positioning holes 212 for accommodating the insertion of the positioning pins 122 are provided on both sides of the bottom of the first bottom plate 21. Thus, the first bottom plate 21 can be limited, the assembly accuracy between the sleeve cup assembly 2 and the tray assembly 1 can be improved, and it is ensured that the liquid injection nozzle 223 of the liquid injection cup 22 can be aligned with the liquid injection port 111 of the battery cell 11.

[0051] Specifically, an avoidance groove 127 is provided on the top of the box body 12, a pin seat 128 is provided in the avoidance groove 127, and the positioning pin 122 is installed on the pin seat 128. Thus, the disassembly and assembly of the positioning pin 122 are facilitated.

[0052] Referring to Figure 4 , in some preferred embodiments, the box body 12 includes a second bottom plate 123 and a plurality of side plates 124 provided at the edge of the second bottom plate 123. The plurality of side plates 124 enclose a closed structure. A plurality of partition plates 125 are provided in the box body 12. The plurality of partition plates 125 and the plurality of side plates 124 form a plurality of accommodation cavities 121, which is convenient for assembly, enables the sizes of the accommodation cavities 121 to be arbitrarily combined and changed. Thus, for battery cells 11 of different specifications, the inner lining modules 13 of different specifications and the sizes of the accommodation cavities 121 can be arbitrarily switched, simplifying the disassembly and assembly steps during fixture changeover and improving production efficiency.

[0053] Referring to Figure 7 , further, threaded holes 126 are provided at the tops of the side plates 124 and the partition plates 125. A stop screw (not shown in the figure) is threadedly connected to the threaded hole 126. The nut of the stop screw is used to lock the top of the inner lining module 13. When the battery cell 11 is taken out, the nut of the stop screw restricts the movement of the inner lining module 13. Thus, the inner lining module 13 can be prevented from being taken out of the box body 12 together with the battery cell 11.

[0054] Referring to Figure 10, in some preferred embodiments, the one-way valve 23 includes a valve seat 231, a valve housing 232, and a valve body 233. The valve housing 232 is disposed on the valve seat 231, and the valve body 233 is movably disposed within the valve housing 232. The valve body 233 and the valve housing 232 enclose a first inner cavity 234, and the valve seat 231 and the valve housing 232 enclose a second inner cavity 235. The valve body 233 passes through the first inner cavity 234 and the second inner cavity 235. The valve body 233 is provided with a first passage 2331. One end of the first passage 2331 communicates with the top of the valve body 233, and the valve body 233 moves to drive the other end of the first passage 2331 to communicate with the first inner cavity 234 or the second inner cavity 235. The valve seat 231 is provided with a second passage 2311, and both ends of the second passage 2311 communicate with the second inner cavity 235 and the inside of the liquid injection cup 22 respectively.

[0055] Specifically, a first compression spring 236 is disposed between the valve body 233 and the valve housing 232, and a second compression spring 237 is disposed between the valve seat 231 and the valve housing 232.

[0056] More specifically, a sealing ring 238 and a sealing ring pressing piece 239 are disposed within the second inner cavity 235. The sealing ring 238 and the sealing ring pressing piece 239 accommodate the valve body 233 to pass through. The top of the sealing ring 238 abuts against the valve housing 232, and the bottom of the sealing ring pressing piece 239 abuts against the top of the second compression spring 237. When the valve body 233 is pressed down, the sealing ring 238 can limit the position of the valve body 233, thereby preventing the valve body 233 from disengaging.

[0057] When the valve body 233 is not subjected to an external force, the first compression spring 236 and the second compression spring 237 are in a natural extended state, and the other end of the first passage 2331 communicates with the first inner cavity 234. Thus, the first inner cavity 234 is isolated from the second inner cavity 235, and external gas can be prevented from entering the liquid injection cup 22.

[0058] When the breathing assembly presses down the one-way valve 23, under the action of an external pressure, the valve body 233 compresses the first compression spring 236 and the second compression spring 237. The valve body 233 descends to drive the other end of the first passage 2331 to communicate with the second inner cavity 235. High-pressure nitrogen enters the second inner cavity 235 from the first passage 2331 of the valve body 233, and then enters the liquid injection cup 22 from the second inner cavity 235. Alternatively, the air in the liquid injection cup 22 can be drawn out from the second inner cavity 235 and the first passage 2331. Thus, injecting high-pressure gas or evacuating can be achieved, enabling the battery liquid injection fixture to also have a pressure maintaining function during transportation.

[0059] The above is a specific description of the preferred embodiments of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A battery liquid injection fixture, characterized in that, Comprising: A tray assembly for clamping battery cells, including a box body and a number of inner lining modules. The top of the box body is open. A number of accommodation cavities are provided inside the box body, and a number of the inner lining modules are respectively accommodated in the number of accommodation cavities. A limiting cavity is provided inside the inner lining module, and the battery cell is placed in the limiting cavity. A liquid injection port is provided at the top of the battery cell. A cup assembly for loading electrolyte, arranged above the tray assembly, including a first bottom plate and a number of liquid injection cups arranged on the first bottom plate. A first through hole and a second through hole are provided at the top of the liquid injection cup. The first through hole is used for injecting high-pressure gas or extracting vacuum, and the second through hole is used for injecting electrolyte. A liquid injection nozzle is provided at the bottom of the liquid injection cup. A one-way valve is installed in the first through hole, and the liquid injection nozzle penetrates through the first bottom plate and corresponds to the liquid injection port. After the liquid injection is completed, the second through hole is blocked by a blocking module. The breathing component of the liquid injection machine opens the one-way valve and injects high-pressure gas or extracts vacuum. After the internal pressure of the liquid injection cup reaches the set value, the one-way valve closes to block the first through hole. A locking component for locking the cup assembly and the tray assembly.

2. The battery liquid injection fixture according to claim 1, wherein The blocking module includes a plug rod, two buckle components and a number of plugs. The number of plugs are sequentially arranged on the plug rod. The two buckle components are respectively arranged on both sides of the first bottom plate, and the two buckle components are respectively used for locking both ends of the plug rod. The number of plugs respectively correspond to the second through holes at the tops of the number of liquid injection cups.

3. The battery liquid injection fixture according to claim 2, wherein The buckle component includes a buckle seat, a swing arm, a hook and a compression spring. The buckle seat is arranged on one side of the top of the first bottom plate. The swing arm is connected to the buckle seat through a rotating shaft. The hook is arranged at one end of the swing arm. The compression spring is installed between the buckle seat and the swing arm, and the hook is used for clamping the end of the plug rod.

4. The battery liquid injection fixture according to claim 3, characterized in that, The buckle seat is provided with a first counterbore, and the swing arm is provided with a second counterbore at the end far from the hook. One end of the compression spring is installed in the first counterbore, and the other end of the compression spring is installed in the second counterbore.

5. The battery liquid injection fixture according to claim 1, characterized in that The locking component includes a first limiting hook, a second limiting hook, a guiding push rod and a guiding block. The first limiting hook is arranged on one side of the first bottom plate. The guiding block is fixed on one side of the box body. The guiding push rod is slidably connected to the guiding block. The second limiting hook is installed on the guiding push rod. The guiding push rod is horizontally arranged, and the guiding push rod is pushed to drive the second limiting hook to engage with or disengage from the first limiting hook.

6. The battery liquid injection fixture according to claim 5, characterized in that, The guiding block is located on one side of the second limiting hook. A blocking bolt is arranged on one side of the second limiting hook close to the guiding block, and the blocking bolt abuts against the guiding block to position the relative position of the second limiting hook with respect to the first limiting hook.

7. A battery liquid injection fixture according to claim 1, characterized in that, Positioning pins are provided on both sides of the top of the box body, and positioning holes for inserting the positioning pins are provided on both sides of the bottom of the first bottom plate.

8. A battery liquid injection fixture according to claim 1, characterized in that, The box body includes a second bottom plate and a plurality of side plates arranged at the edge of the second bottom plate. The plurality of side plates enclose a closed structure, and a plurality of partitions are arranged in the box body. The plurality of partitions and the plurality of side plates form a plurality of accommodation cavities.

9. The battery liquid injection fixture according to claim 8, characterized in that, Threaded holes are provided at the tops of the side plates and the partitions, and stop screws are connected to the threaded holes. The nuts of the stop screws are used to lock the top of the inner lining module.

10. The battery liquid injection fixture according to claim 1, characterized in that, The one-way valve includes a valve seat, a valve housing, and a valve body. The valve housing is arranged on the valve seat. The valve body is movably arranged in the valve housing. The valve body and the valve housing enclose a first inner cavity. The valve seat and the valve housing enclose a second inner cavity. The valve body passes through the first inner cavity and the second inner cavity. The valve body is provided with a first channel. One end of the first channel communicates with the top of the valve body. The valve body moves to drive the other end of the first channel to communicate with the first inner cavity or the second inner cavity. The valve seat is provided with a second channel. Both ends of the second channel communicate with the second inner cavity and the inside of the liquid injection cup respectively. A first compression spring is arranged between the valve body and the valve housing. A second compression spring is arranged between the valve seat and the valve housing. When the valve body is not affected by external forces, the first compression spring and the second compression spring are in a natural extended state, and the other end of the first channel communicates with the first inner cavity. Under the action of external pressure on the valve body, the first compression spring and the second compression spring are compressed, and the valve body descends to drive the other end of the first channel to communicate with the second inner cavity.

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