Electrolyte injection device and electrolyte injection system

Abstract

The invention discloses an electrolyte injection device and system, and the device comprises a pressure cavity which is used for the placement of a battery cell, the size of the pressure cavity is larger than the size of the battery cell, and the pressure cavity is matched with the battery cell; a cavity door for communicating the pressure cavity with the outside is arranged on one side of the pressure cavity; a liquid injection nozzle is arranged in the pressure cavity, the liquid injection nozzle is communicated with an electrolyte supply part, a breather valve and an isobaric valve, and the electrolyte supply part is used for injecting electrolyte into the battery cell inner cavity; and the isobaric valve is also communicated with the pressure cavity and is used for balancing the air pressure in the inner cavity of the battery cell and the pressure cavity. The pressure cavity is matched with the battery cell, which means that the shape of the cross section of the pressure cavity is the same as that of the cross section of the battery cell, less waste exists in the peripheral space of the pressure cavity, the waste rate of process gas is correspondingly reduced, and the pressurization and pressure relief processes are correspondingly quicker, so that the time of infiltrating the battery cell by the electrolyte is shortened, and the electrolyte injection efficiency is improved.

Description

Technical Field

[0001] The invention relates to battery manufacturing equipment, and in particular to an electrolyte injection device and an injection system. Background Art

[0002] The principle of liquid injection by the liquid injection machine is to inject the electrolyte into the limited internal cavity of the battery cell (the cavity includes the battery cell and the unfilled space) through a certain process method (such as vacuum, pressure, time). Part of the electrolyte infiltrates into the battery cell (composed of positive and negative pole pieces, and diaphragms), and part of it occupies the unfilled space. The more electrolyte that infiltrates into the battery cell, the better the infiltration effect is relatively speaking, and the shorter the time it takes for the electrolyte to infiltrate the battery cell, the better the working ability of the liquid injection machine. For a certain battery cell, the deviation between the actual injection amount and the set injection amount is the injection accuracy. For the same batch of battery cells, the better the consistency of the injection amount and the more concentrated the injection amount, the better the overall performance of the liquid injection machine.

[0003] In the process of injecting electrolyte into the cavity, the air in the cavity needs to be removed as much as possible to avoid bubbles in the cavity of the finished battery cell. The presence of bubbles will not only affect the infiltration amount of the battery cell, but also cause large deviations in the injection amount between each battery cell, seriously affecting the performance quality of the battery cell.

[0004] In the prior art, in order to solve the above technical problems, the technical means adopted are bell-shaped vertical isobaric liquid injection machine and tunnel-shaped horizontal isobaric liquid injection machine. Before liquid injection, several lithium battery cells to be injected are placed in the pressure chamber. When pressurized and left to stand, the pressure chamber pressurizes the internal cavity of the battery cell, thereby discharging the air in the internal cavity of the battery cell. However, the pressure chamber cross-sections of the bell-shaped vertical isobaric liquid injection machine and the tunnel-shaped horizontal isobaric liquid injection machine are both circular, and the square battery cell tray is placed inside, and there is a problem of waste of space around them. In the process of pressurizing and depressurizing the cavity, this part of the space has a considerable proportion of process gas waste, and will lead to a long injection time and low injection efficiency. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides an electrolyte injection device and injection system which can reduce the volume waste of the pressure chamber and improve the injection efficiency and injection accuracy.

[0006] The first technical solution adopted by the present invention to solve its technical problem is:

[0007] An electrolyte injection device comprises: a pressure chamber, the volume of the pressure chamber is greater than the volume of a battery cell, and the pressure chamber is adapted to the battery cell;

[0008] A cavity door is provided on one side of the pressure cavity for opening and closing the pressure cavity and allowing the battery cell to enter and exit;

[0009] A liquid injection nozzle is provided in the pressure chamber. The liquid injection nozzle is connected to an electrolyte supply member, a breathing valve, and an isobaric valve. The electrolyte supply member is used to inject electrolyte into the inner cavity of the battery cell; the isobaric valve is also connected to the pressure chamber, and the isobaric valve is used to balance the air pressure between the inner cavity of the battery cell and the pressure chamber.

[0010] As a further improvement of the above technical solution, a liquid injection cup is provided at the top of the pressure chamber. The liquid injection nozzle is provided at the lowest point of the liquid injection cup and is connected to the liquid injection cup; the electrolyte supply member, the breathing valve, the isobaric valve, and the breathing valve are all connected to the liquid injection cup.

[0011] As a further improvement of the above technical solution, a positioning block (35) is fixedly connected to the bottom of the liquid injection cup. The liquid injection nozzle passes through the positioning block, and the positioning block is used to fix the relative position of the battery cell and the liquid injection nozzle.

[0012] As a further improvement of the above technical solution, guiding and limiting blocks are provided on the periphery of the positioning block. The opposite surfaces of each guiding and limiting block are guiding surfaces that are inclined toward the liquid injection nozzle direction, and the guiding surfaces are used to guide the liquid injection nozzle to align with the liquid injection port.

[0013] As a further improvement of the above technical solution, a chamber door guiding frame is provided on the side of the pressure chamber where the chamber door is provided. A chamber door guiding groove is provided inside the chamber door guiding frame. An upper opening of the guiding frame is provided at the top of the chamber door guiding frame. The chamber door is slidably provided in the chamber door guiding groove of the chamber door guiding frame, and the upper part of the chamber door extends out from the upper opening of the guiding frame and is connected with a lifting connecting rod.

[0014] As a further improvement of the above technical solution, a connecting rod guiding frame is provided on the upper part of the chamber door. The lower end of the connecting rod guiding frame is fixedly connected to the chamber door guiding frame. The upper end of the connecting rod guiding frame has a guiding hole. The upper part of the lifting connecting rod passes through the guiding hole and is slidably connected with the connecting rod guiding frame.

[0015] As a further improvement of the above technical solution, the opening direction of the chamber door is arranged from top to bottom along the pressure chamber, and a pressing block is provided on the lower side of the chamber door;

[0016] A pushing block and a lever structure are provided at the bottom of the pressure chamber. The lever structure includes a pressing rod near the chamber door side and a jack rod near the pushing block side;

[0017] The jack rod is used to jack up the pushing block, driving the pushing block to jack up the battery cell;

[0018] When the chamber door is closed, the pressing block is used to press down the pressing rod, and the jack rod jacks up the pushing block.

[0019] As a further improvement of the above technical solution, a plurality of transmission rollers are provided below the pressure chamber and above the lever structure, and the transmission rollers are used to guide the battery cells to enter and exit the pressure chamber.

[0020] As a further improvement of the above technical solution, the push block is provided with several give-way grooves matching the transmission rollers. When the push block is pushed upward by the push rod, the push block extends from the several transmission rollers, the transmission rollers enter the give-way grooves, and the protruding part of the push block extends from the gap between the rollers of the transmission rollers and supports the battery cell.

[0021] As a further improvement of the above technical solution, a first guide member and a second guide member are provided at the bottom of the pressure chamber;

[0022] A first guide member passes through the lever structure;

[0023] The second guide member is disposed on a side of the push block away from the lever structure;

[0024] The push block is provided with a first guide hole, and the first guide member is slidably connected with the push block through the first guide hole;

[0025] The push block is provided with a second guide hole, and the second guide member is slidably connected with the push block through the second guide hole.

[0026] The present invention also provides:

[0027] An electrolyte injection system comprises: a circular rotating base, a plurality of electrolyte injection devices are fixed on the circumference of the circular rotating base;

[0028] An annular slide rail is fixed above the circular rotating base, and an upwardly extending arc-shaped convex slide rail and a continuous horizontal slide rail are provided on the annular slide rail;

[0029] The top of each cavity door is respectively connected with a cam follower;

[0030] The circular rotating base rotates relative to the annular slide rail to drive the cam follower to slide on the annular slide rail;

[0031] The electrolyte injection device is fixed to the circular rotating base and rotates synchronously with the circular rotating base. When the electrolyte injection device rotates following the circular rotating base, the electrolyte injection device drives the cam follower to move in the annular slide rail;

[0032] When the electrolyte injection device is located below the arc-shaped slide rail, the chamber door is in an open state;

[0033] When the electrolyte injection device is located below the horizontal slide rail, the chamber door is in a closed state.

[0034] The beneficial effects of the present invention are as follows:

[0035] In this technical solution, the pressure chamber is adapted to the battery cell, which means that the cross-section of the pressure chamber is the same as the cross-section shape of the battery cell, thereby reducing the problem of waste in the surrounding space of the pressure chamber, and the waste rate of the process gas will also be correspondingly reduced. The pressurization and pressure relief processes will also be correspondingly faster, thereby shortening the time for the electrolyte to infiltrate the battery cell and improving the filling efficiency of the electrolyte. The positive high pressure and negative pressure cycles of the battery cell are realized through an equal pressure valve, a breathing valve, etc., greatly improving the filling efficiency. In addition, since a chamber door is provided on one side of the pressure chamber for opening and closing the pressure chamber and allowing the battery cell to enter and exit, the battery cell can be quickly operated to enter and exit, which is convenient and fast, and helps to improve production efficiency.

[0036] Using a single battery cell in a small square chamber for static placement maximizes space utilization, and the manufacturing process of the small square chamber is simple. The static pressure can be increased to more than 10 MPa, greatly improving the filling efficiency of the battery cell with electrolyte, enhancing the infiltration effect of the electrolyte on the electrode, and further improving the quality and performance of the battery.

[0037] On the other hand, through the above technical means, the chamber pressure of the pressure chamber is increased, and the increased chamber pressure can further increase the filling pressure of the electrolyte, thereby improving the filling efficiency of the electrolyte and the production efficiency of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below in conjunction with the drawings and embodiments.

[0039] Figure 1 is a three-dimensional structural schematic diagram of an electrolyte filling device;

[0040] Figure 2 is an exploded view of a filling cup, a filling nozzle, and a positioning block;

[0041] Figure 3 is an exploded view of a transmission roller, a pushing block, a first guiding member, a second guiding member, and a lever structure;

[0042] Figure 4 is one of the cross-sectional views of the electrolyte filling device;

[0043] Figure 5 is another cross-sectional view of the electrolyte filling device;

[0044] Figure 6 is a front view of the electrolyte filling system;

[0045] Figure 7 is a rear view of the electrolyte filling system;

[0046] Figure 8 is a bottom view of the electrolyte filling system;

[0047] The reference numerals are as follows:

[0048] 1 - Pressure chamber;

[0049] 2 - Chamber door; 21 - Pressure block; 23 - Lifting connecting rod; 24 - Connecting rod guide frame;

[0050] 31 - Liquid injection nozzle; 32 - Electrolyte supply part; 33 - Breather valve; 34 - Liquid injection cup; 35 - Positioning block; 351 - Guiding and limiting block; 352 - Pole post relief groove; 36, Equal pressure valve;

[0051] 41 - Pushing block; 411 - Relief groove; 42 - Lever structure; 421 - Fixed seat; 422 - Rocking arm; 43 - Pressing rod; 44 - Ejector rod; 45 - First guiding part; 46 - Second guiding part;

[0052] 5 - Transmission roller;

[0053] 6 - Cam follower;

[0054] 100 - Circular rotating base;

[0055] 200 - Annular slide rail; 201 - Arc-shaped slide rail; 202 - Horizontal slide rail.

[0056] 300 - Electrolyte injection device;

[0057] 400 - Battery cell; Detailed implementation manners

[0058] The concept, specific structure and technical effects of the present invention will be clearly and completely described below in conjunction with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative efforts shall fall within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer only 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 present invention can be combined interactively without conflicting with each other.

[0059] Referring to Figure 1 , Figure 4 , Figure 5 , an electrolyte injection device 300 includes: a pressure chamber 1, the volume of the pressure chamber 1 is larger than the volume of the battery cell 400, and the pressure chamber 1 is adapted to the battery cell 400;

[0060] One side of the pressure chamber 1 is provided with a chamber door 2 for communicating the pressure chamber 1 with the outside.

[0061] The pressure chamber 1 is adapted to the battery cell 400, which means that the cross-sectional shape of the pressure chamber 1 is the same as that of the battery cell 400. The wasted space around the pressure chamber is relatively small, minimizing the ineffective space. Correspondingly, the waste rate of the process gas will also be reduced, and the pressurization and depressurization processes will be correspondingly faster. Thus, the time for the electrolyte to infiltrate the battery cell 400 is accelerated, the liquid injection efficiency of the electrolyte is improved, the infiltration effect of the electrolyte on the battery cell 400 is enhanced, and further the quality and performance of the battery cell 400 are improved.

[0062] Referring Figure 4 、 Figure 5 , in an embodiment, the pressure chamber 1 is provided with a liquid injection nozzle 31. The liquid injection nozzle 31 is communicated with an electrolyte supply member 32, a breathing valve 33 and an isobaric valve 36. The electrolyte supply member 32 is used to inject electrolyte into the inner cavity of the battery cell 400; the electrolyte supply member 32, the breathing valve 33 and the isobaric valve 36 are also communicated with the pressure chamber 1, and the isobaric valve 36 is used to balance the air pressure in the inner cavity of the battery cell 400 and the pressure chamber 1.

[0063] In some embodiments, a cavity door guide frame 22 is provided on the side of the pressure cavity 1 where the cavity door 2 is arranged. The cavity door wire frame 22 is a square frame, and its shape and size are adapted to the cavity door 2. A cavity door guide groove is arranged inside the cavity door guide frame 22. In this embodiment, the cavity door guide groove is a vertical guide frame arranged on both sides inside the cavity door guide frame. In some embodiments, other structures capable of realizing the guiding function can also be used to replace the cavity door guide groove. An upper opening of the guide frame is provided at the top of the cavity door guide frame 22. The cavity door 2 is slidably arranged in the cavity door guide groove of the cavity door guide frame 22, and the upper part of the cavity door 2 extends out from the upper opening of the guide frame and is connected with a lifting connecting rod 23. Specifically, a connecting rod guide frame 24 is arranged on the upper part of the cavity door 2. The lower end of the connecting rod guide frame 24 is fixedly connected with the cavity door guide frame 22. The upper end of the connecting rod guide frame 24 has a guide hole. The upper part of the lifting connecting rod 23 passes through the guide hole and is slidably connected with the connecting rod guide frame 24. In this embodiment, the connecting rod guide frame 24 is in an inverted U shape. The lower end of the connecting rod guide frame 24 is fixedly connected with the cavity door guide frame 22. The upper end of the connecting rod guide frame 24 has a guide sleeve. The guide hole is the central through hole of the guide sleeve. The upper end of the lifting connecting rod 23 passes through the central through hole of the guide sleeve of the connecting rod guide frame 24. Since the lifting connecting rod 23 extends out a certain length from the upper part of the cavity door 2, through the sliding connection structure between the connecting rod guide frame 24 and the lifting connecting rod 23, better stability can be provided for the lifting connecting rod 23, the lifting of the cavity door 2 is smoother, the lifting connecting rod 23 is not easily deformed, and the structure is more stable and reliable. During specific implementation, when the cavity door 2 slides in the cavity door guide groove of the cavity door guide frame 22, the sliding seal of the cavity door 2 can be realized. The upper end of the lifting connecting rod 23 is connected with the cam follower 6 of the liquid injection system. By using the cooperation structure between the cam follower 6 and the annular slide rail 200, the function of automatically lifting the cavity door 2 can be realized.

[0064] During use, open the chamber door 2, load the battery cell 400 to be filled with liquid into the pressure chamber 1, and ensure that the liquid injection port of the battery cell 400 is aligned with the liquid injection nozzle 31; close the chamber door 2, evacuate the battery cell 400 to create a negative pressure state inside the battery cell 400. The purpose of this step is to discharge the gas inside the battery cell 400 and create a pressure difference for subsequent electrolyte injection; after a negative pressure is formed inside the battery cell 400, the electrolyte supply member 32 is activated to inject the electrolyte into the battery cell 400. Due to the pressure difference between the inside and outside of the battery cell 400, the electrolyte will be sucked into the battery cell 400. After injecting a certain amount of electrolyte, the equalizing valve 36 is activated to make the air pressure inside the battery cell 400 the same as that inside the pressure chamber 1, and then the breathing process of charging to a high positive pressure, restoring to normal pressure, and evacuating is cycled through the breathing valve 33. The above steps of charging to a positive pressure, restoring air pressure, and evacuating are repeated several times to ensure that the electrolyte fully wets the battery cell.

[0065] Refer to Figure 4 、 Figure 5 Furthermore, a liquid injection cup 34 is provided at the top of the pressure chamber 1. The liquid injection nozzle 31 is provided at the lowest point of the liquid injection cup 34 and is communicated with the liquid injection cup 34. The electrolyte supply member 32 supplies the electrolyte into the liquid injection cup 34. The electrolyte in the liquid injection cup 34 gathers at the lowest point under the action of gravity and flows through the liquid injection nozzle 31 into the battery cell 400, minimizing the residual amount of the electrolyte in the liquid injection cup 34.

[0066] Specifically, the liquid injection cup 34 is provided at the top of the pressure chamber 1. During liquid injection, the battery cell 400 is located below the liquid injection cup 34.

[0067] Refer to Figure 2 、 Figure 4 、 Figure 5 Specifically, a positioning block 35 is fixedly connected to the bottom of the liquid injection cup 34. The liquid injection nozzle 31 passes through the positioning block 35. The positioning block 35 is used to fix the relative positions of the battery cell 400 and the liquid injection nozzle 31 to ensure that the liquid injection nozzle 31 is aligned with the liquid injection port on the battery cell 400.

[0068] More specifically, guiding and limiting blocks 351 are provided on the periphery of the positioning block 35. A pole post relief groove 352 is provided on the positioning block 35. The guiding and limiting blocks 351 are arranged along the periphery of the battery cell 400 to fix the position of the battery cell 400; inclined guiding surfaces are provided on the facing surfaces of the guiding and limiting blocks 351, all facing the direction of the liquid injection nozzle 31, and the guiding surfaces are used to guide the alignment of the liquid injection nozzle 31 with the liquid injection port; generally, a pole post protruding from the outer shell of the battery cell 400 is provided on the battery cell 400, which may affect the alignment accuracy between the liquid injection nozzle 31 and the liquid injection port. The pole post relief groove 352 is provided to cooperate with the pole post, increasing the reference object when aligning the liquid injection nozzle 31 with the liquid injection port and further improving the alignment accuracy between the liquid injection nozzle 31 and the liquid injection port.

[0069] In any of the above embodiments, the opening direction of the chamber door 2 is from top to bottom along the pressure chamber 1, and a pressure block 21 is provided at the lower side of the chamber door 2;

[0070] A push block 41 and a lever structure 42 are provided at the bottom of the pressure chamber 1. The lever structure 42 includes a pressure rod 43 close to one side of the chamber door 2 and a push rod 44 close to one side of the push block 41.

[0071] The push rod 44 is used to lift the push block 41, driving the push block 41 to lift the battery cell 400;

[0072] Reference Figure 4 When the chamber door 2 is closed, the pressing block 21 presses down the pressing rod 43, so that the ejector rod 44 is lifted up, and the ejector rod 44 drives the pushing block 41 to lift up the battery cell 400. Since the battery cell 400 is fixed in position relative to the liquid injection nozzle 31 through the positioning block 35, when the battery cell 400 is lifted up, the positioning block 35 can ensure that the liquid injection nozzle 31 is aligned with the liquid injection port on the battery cell 400, thereby ensuring smooth liquid injection. Specifically, under the guidance and limiting action of the guide limit block 351 of the positioning block 35, the liquid injection port of the battery cell 400 can be accurately docked with the liquid injection nozzle 31;

[0073] Reference Figure 5 When the chamber door 2 is opened, since the pressure rod 43 lacks pressure and the battery cell 400 is located on one side of the push rod 44, the push rod 44 descends under the gravity of the battery cell 400 and the push block 41, and the pressure rod 43 is lifted up.

[0074] Compared with the prior art in which a separate driving structure is provided to drive the battery cell 400 to lift so that the injection nozzle 31 is aligned with the injection port, in this embodiment, the chamber door 2 and the pressure block 21 are arranged in linkage, and the injection nozzle 31 is aligned with the injection port when the chamber door 2 is closed, which has a simple structure and low manufacturing cost.

[0075] Reference Figure 3 The lever structure 42 is a conventional setting in the prior art. For example, the lever structure 42 includes a fixed seat 421 and a rocker arm 422; the fixed seat 421 is fixed to the bottom of the pressure chamber 1 or the side wall of the pressure chamber 1, and the fixed seat 421 is rotatably connected to the rocker arm 422.

[0076] Specifically, the pushing block 41 is in surface contact with the battery cell 400 to reduce the instability of the battery cell 400 when the pushing block 41 lifts the battery cell 400 , thereby making the battery cell 400 more stable.

[0077] Specifically, a plurality of transmission rollers 5 are provided below the pressure chamber 1 and above the lever structure 42 , and the transmission rollers 5 are used to guide the battery cell 400 in and out of the pressure chamber 1 , reduce the friction between the battery cell 400 and the inner wall of the pressure chamber 1 , and avoid damage to the appearance and performance of the battery cell 400 .

[0078] More specifically, the push block 41 is provided with a plurality of clearance grooves 411 matching the transmission rollers 5. When the push rod 44 pushes the push block 41, the push block 41 extends from the plurality of transmission rollers 5 and contacts the battery cell 400. In addition, by providing a plurality of clearance grooves 411 on the push block 41, the push block 41 can have a plurality of extensions passing through the roller gap of the transmission roller 5 and lifting the battery cell 400 to ensure that the contact area between the push block 41 and the battery cell 400 is large enough, further reducing the displacement of the battery cell 400 when the push block 41 lifts the battery cell 400, and improving the stability of the battery cell 400 when lifting.

[0079] In any of the above embodiments, a first guide member 45 and a second guide member 46 are provided at the bottom of the pressure chamber 1;

[0080] The first guide member 45 passes through the lever structure 42 and is slidably connected to the push block 41. Specifically, a first guide hole 451 is provided on the push block 41, and the first guide member 45 is slidably connected to the push block 41 through the first guide hole 451;

[0081] The second guide member 46 is disposed on a side of the push block 41 away from the lever structure 42, and is slidably connected to the push block 41. The push block 41 is provided with a second guide hole 461, and the second guide member 46 is slidably connected to the push block 41 through the second guide hole 461. The first guide member 45 and the second guide member 46 are used to assist the push block 41 in being in a stable sliding state when being lifted, and further reduce the probability of displacement of the battery cell 400 during the lifting process.

[0082] And when the push block 41 is lifted to the highest point, refer to Figure 4 , the push block 41 is clamped by the battery cell 400 and the push rod 44. At this time, the stability of the push block 41 is determined by whether the chamber door 2 is opened. As long as the chamber door 2 remains closed, the position of the push block 41 and the battery cell 400 in the pressure chamber 1 can remain fixed, and the injection nozzle 31 and the injection port always remain in contact. After the push block 41 pushes the battery cell 400 to the highest point, the injection port of the battery cell 400 is matched with the position of the injection nozzle 31 on the injection cup 34. At this time, the electrolyte in the injection cup 34 can be injected into the battery cell 400 through the injection nozzle 31.

[0083] Reference Figure 6 , Figure 7 , Figure 8, an electrolyte injection device 300, comprising: a circular rotating base 100, on the circumferential side of which are fixed several electrolyte injection devices 300 described in any one of the above embodiments;

[0084] Above the circular rotating base 100 is fixed an annular slide rail 200, and the circular rotating base 100 and the annular slide rail 200 are in a relatively rotatable connection relationship. An upward arc-shaped slide rail 201 and a horizontal slide rail 202 are provided on the annular slide rail 200;

[0085] Cam followers 6 are respectively connected to the tops of the respective chamber doors 2. Specifically, in this embodiment, the cam followers 6 are arranged at the upper ends of the lifting connecting rods 23 connected to the upper ends of the chamber doors 2. During application, the cam followers 6 extend into the annular slide rail 200 and can slide within the annular slide rail 200.

[0086] The circular rotating base 100 rotates relative to the annular slide rail 200 to drive the cam followers 6 to slide on the annular slide rail 200;

[0087] The electrolyte injection device 300 is fixed to the circular rotating base 100 and rotates synchronously with the circular rotating base 100. When the electrolyte injection device 300 rotates following the circular rotating base 100, the electrolyte injection device 300 drives the cam followers 6 to move within the annular slide rail 200;

[0088] When the electrolyte injection device 300 moves below the arc-shaped slide rail 201, the chamber door 2 is in an open state;

[0089] When the electrolyte injection device 300 moves below the horizontal slide rail 202, the chamber door 2 is in a closed state.

[0090] Therefore, the opening and closing of the chamber door 2 of the electrolyte injection device 300, the lever structure 42 drives the push block 41 to lift the battery cell 400, and the injection port of the battery cell 400 is aligned with the injection nozzle 31. This process is completed during the process of the cam follower 6 sliding from the arc-shaped slide rail 201 to the horizontal slide rail 202. Therefore, as long as the circular rotating base 100 rotates relative to the annular slide rail 200, it can be ensured that each electrolyte injection device 300 on the circular rotating base 100 sequentially completes injection, and when the speed of the circular rotating base 100 rotating relative to the annular slide rail 200 for one circle remains unchanged, the differences between the battery cells 400 in each electrolyte injection device 300 can be minimized to improve the consistency between the battery cells.

[0091] Compared with bell-jar vertical isobaric liquid injection machines and tunnel-cavity horizontal isobaric liquid injection machines, this device can carry more battery cells in the same space, effectively saving the floor area of the system.

[0092] More specifically, the circumference of the horizontal slide rail 202 is greater than that of the arc-shaped slide rail 201. When the electrolyte liquid injection device 300 is located below the horizontal slide rail 202, the battery cell 400 is in a liquid injection or stationary state. Compared with the prior art where the liquid injection device and the stationary device are separately arranged, after liquid injection, it is still necessary for manual or logistics handling mechanisms to transport the battery cell from the liquid injection device to the stationary device for stationary. The design of the logistics handling mechanism is complex, resulting in a large overall floor area of the equipment, high comprehensive equipment costs, and difficulty in forming a standardized battery cell manufacturing process. In this embodiment, the liquid injection device and the stationary device are integrated, with a compact structure, simple design, and lower manufacturing costs.

[0093] Moreover, in the existing isobaric liquid injection machines, during the processes of battery cell liquid injection, transportation, and stationary, the battery cells need to be placed in a carrier, and the battery cells complete each process step together with the carrier. Therefore, there are processes of loading and unloading the trays. In this embodiment, the battery cell 400 does not require any follow-up carrier during the process of rotating with the circular rotating base 100. Of course, after the battery cell enters the pressure chamber 1, the stable cooperation of the positioning block 35, the lever structure 42, and the push block 41 can ensure the accurate positioning of the battery cell during the liquid injection process.

[0094] It can be understood that the circular rotating base 100 is coaxial with the annular slide rail 200, and the circular rotating base 100 rotates around its axis.

[0095] It can be understood that the protruding direction of the arc-shaped slide rail 201 is towards the top of the pressure chamber 1.

[0096] The working principle of this system is as follows:

[0097] Refer to Figures 1 - 8 , when the external feeding mechanism or manual labor is on the side where the arc-shaped slide rail 201 is located, and when the chamber door 2 of one of the electrolyte liquid injection devices 300 is opened, the external feeding mechanism or manual labor places the battery cell 400 into the pressure chamber 1. As the circular rotating base 100 rotates, the cam follower 6 slides at the arc-shaped slide rail 201 to the horizontal slide rail 202, simultaneously driving the chamber door 2 to close and the pressure rod 43 to descend under the action of the pressing block 21, causing the ejector rod 44 to lift. The ejector rod 44 drives the push block 41 to lift the battery cell 400. The side edge at the top of the battery cell 400 is guided by the guiding limiting block 351, and the liquid injection nozzle 31 is aligned with the liquid injection port;

[0098] The pressure chamber 1 is evacuated. After maintaining the vacuum pressure for a period of time, the electrolyte supply member 32 is opened, and the electrolyte is injected into the battery cell 400 via the liquid injection cup 34 and the liquid injection nozzle 31. Then, the equalizing valve 36 is opened, and then the breathing valve 36 is opened. After multiple positive and negative pressure breathing cycles, the pressure chamber 1 is depressurized. At this time, the electrolyte injection device 300 also slides to the junction of the horizontal slide rail 202 and the arc-shaped slide rail 201. As the circular rotating base 100 further rotates, the cam follower 6 slides from the horizontal slide rail 202 to the arc-shaped slide rail 201, and the chamber door 2 is opened, and the battery cell 400 can be taken out.

[0099] The above is a specific description of the preferred embodiment of the present invention. However, the present invention is not limited to the described embodiment. Those skilled in the art can make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included in the scope defined by the claims of this application.

Claims

1. An electrolyte injection device, characterized in that, Comprising: A pressure chamber (1), the volume of the pressure chamber (1) being larger than the volume of the battery cell, and the pressure chamber (1) being adapted to the battery cell; One side of the pressure chamber (1) is provided with a chamber door (2) for opening and closing the pressure chamber (1) and allowing the battery cell to enter and exit; A liquid injection nozzle (31) is provided inside the pressure chamber (1), the liquid injection nozzle (31) being connected to an electrolyte supply member (32), a breathing valve (33), and an isobaric valve (36). The electrolyte supply member (32) is used to inject electrolyte into the inner cavity of the battery cell; the isobaric valve (36) is also connected to the pressure chamber (1), and the isobaric valve (36) is used to balance the air pressure inside the inner cavity of the battery cell and the pressure chamber (1).

2. The electrolyte injection device according to claim 1, wherein: A liquid injection cup (34) is provided at the top of the pressure chamber (1), the liquid injection nozzle (31) being provided at the lowest point of the liquid injection cup (34) and communicating with the liquid injection cup (34); the electrolyte supply member (32), the breathing valve (33), and the isobaric valve (36) are all connected to the liquid injection cup (34).

3. The electrolyte injection device according to claim 2, characterized in that: A positioning block (35) is fixedly connected to the bottom of the liquid injection cup (34), the liquid injection nozzle (31) passing through the positioning block (35). The positioning block (35) is used to fix the relative positions of the battery cell and the liquid injection nozzle (31).

4. The electrolyte injection device according to claim 3, characterized in that: Guiding and limiting blocks (351) are provided on the periphery of the positioning block (35). The facing surfaces of the guiding and limiting blocks (351) are guiding surfaces inclined towards the direction of the liquid injection nozzle (31), and the guiding surfaces are used to guide the alignment of the liquid injection nozzle (31) with the liquid injection port of the battery cell (400).

5. The electrolyte injection device according to claim 1, characterized in that: On the side of the pressure chamber (1) where the chamber door (2) is provided, a chamber door guiding frame (22) is provided. Inside the chamber door guiding frame (22), there is a chamber door guiding groove, and an upper opening of the guiding frame is provided at the top of the chamber door guiding frame (22). The chamber door (2) is slidably arranged in the chamber door guiding groove of the chamber door guiding frame (22), and the upper part of the chamber door (2) extends out from the upper opening of the guiding frame and is connected to a lifting connecting rod (23).

6. The electrolyte injection device according to claim 5, wherein: An connecting rod guiding frame (24) is provided on the upper part of the chamber door (2). The lower end of the connecting rod guiding frame (24) is fixedly connected to the chamber door guiding frame (22), and the upper end of the connecting rod guiding frame (24) has a guiding hole. The upper part of the lifting connecting rod (23) passes through the guiding hole and is slidably connected to the connecting rod guiding frame (24).

7. The electrolyte injection device according to any one of claims 1-6, characterized in that: The opening direction of the chamber door (2) is set from top to bottom along the pressure chamber (1), and a pressing block (21) is provided on the lower side of the chamber door (2); A pushing block (41) and a lever structure (42) are provided at the bottom of the pressure chamber (1). The lever structure (42) includes a pressing rod (43) on the side close to the chamber door (2) and a jacking rod (44) on the side close to the pushing block (41); The jacking rod (44) is used to jack up the pushing block (41), driving the pushing block (41) to jack up the battery cell; When the chamber door (2) is closed, the pressing block (21) is used to press down the pressing rod (43), and the jacking rod (44) jacks up the pushing block (41).

8. The electrolyte injection device according to claim 7, wherein: A plurality of transmission rollers (5) are provided below the pressure chamber (1) and above the lever structure (42), and the transmission rollers (5) are used to guide the battery cells to enter and exit the pressure chamber (1); The push block (41) is provided with a plurality of clearance grooves (411) matching the transmission rollers (5); when the push rod (44) pushes the push block (41) upward, the push block (41) extends from the plurality of transmission rollers (5), the transmission rollers (5) enter the clearance grooves (411), and the protruding portion of the push block (41) extends from the gap between the transmission rollers (5) and supports the battery cell (400).

9. The electrolyte injection device according to claim 7 or 8, characterized in that: A first guide member (45) and a second guide member (46) are provided at the bottom of the pressure chamber (1); A first guide member (45) passes through the lever structure (42); The second guide member (46) is arranged on a side of the push block (41) away from the lever structure (42); The push block (41) is provided with a first guide hole (451), and the first guide member (45) is slidably connected to the push block (41) through the first guide hole (451); The push block (41) is provided with a second guide hole (461), and the second guide member (46) is slidably connected to the push block (41) through the second guide hole (461).

10. An electrolyte injection system, characterized in that, include: A circular rotating base (100), wherein a plurality of electrolyte injection devices (300) according to any one of claims 1 to 9 are fixed on the circumference of the circular rotating base (100); An annular slide rail (200) is fixed above the circular rotating base (100), and an upwardly extending arc-shaped convex slide rail (201) and a continuous horizontal slide rail (202) are provided on the annular slide rail (200); The top of each cavity door (2) is respectively connected to a cam follower (6); The circular rotating base (100) rotates relative to the annular slide rail (200) to drive the cam follower (6) to slide on the annular slide rail (200); The electrolyte injection device (300) is fixed to the circular rotating base (100) and rotates synchronously with the circular rotating base (100); when the electrolyte injection device (300) rotates following the circular rotating base (100), the electrolyte injection device (300) drives the cam follower (6) to move in the annular slide rail (200); When the electrolyte injection device is located below the arc-shaped slide rail (201), the chamber door (2) is in an open state; When the electrolyte injection device is located below the horizontal slide rail (202), the chamber door (2) is in a closed state.

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