Lithium manganese iron phosphate soft package battery liquid injection device

Abstract

The invention discloses a liquid injection device for a lithium manganese iron phosphate soft package battery in the technical field of soft package battery processing. The liquid injection device comprises a liquid injection box, a vacuum chamber and a liquid injection cavity are arranged in the liquid injection box; a fixing assembly and an intermittent uniform spreading assembly are arranged in the vacuum chamber, the fixing assembly is used for fixing a battery pack to be injected with electrolyte, and the intermittent uniform spreading assembly is used for performing gap uniform spreading treatment on the battery pack injected with the electrolyte; a liquid injection needle is arranged at the bottom of the liquid injection cavity; an opening and closing assembly is arranged between the liquid injection cavity and the liquid injection needle head and is used for controlling intermittent connection and disconnection between the liquid injection cavity and the liquid injection needle head based on operation of the clearance type uniform spreading assembly; the liquid injection needle head is used for injecting the electrolyte in the liquid injection cavity into the battery pack; a nitrogen assembly and a liquid injection assembly are further communicated with the interior of the liquid injection cavity, the nitrogen assembly is used for introducing nitrogen into the liquid injection cavity, and the liquid injection assembly is used for conveying quantitative electrolyte into the liquid injection cavity. According to the scheme, the attached electrolyte is taken away through flowing of nitrogen, so that the wall hanging phenomenon is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of soft-pack battery processing, and in particular is a liquid injection device for lithium manganese iron phosphate soft-pack batteries. Background Art

[0002] As an advanced cathode material for lithium-ion batteries, lithium iron phosphate (LiMnPO4) has broad application prospects in electric vehicles, energy storage systems, etc. due to its low cost, high safety performance, high thermal stability and long life. Lithium iron phosphate soft-pack batteries are packaged in aluminum-plastic film, with advantages such as light weight, low internal resistance, good cycle performance and flexible design, becoming a hot topic in the battery industry.

[0003] In the production process of lithium manganese iron phosphate soft-pack batteries, injection is a key step that directly affects the electrochemical performance and safety performance of the battery. However, the existing injection technology still faces multiple precision problems, which seriously restricts the quality and efficiency of battery production. For example, during the injection process, due to the roughness or insufficient smoothness of the internal surface of the injection machine, the electrolyte will adhere to the inside of the injection machine or the battery shell instead of being completely injected into the battery. This phenomenon will not only reduce the amount of electrolyte actually injected into the battery, affecting the capacity and performance of the battery, but also cause a waste of electrolyte. In addition, the electrolyte hanging on the wall may volatilize or leak during the drying and packaging process to form residual liquid, causing secondary pollution to the battery, further affecting the performance and safety of the battery. The problem of electrolyte hanging on the wall directly leads to a reduction in injection accuracy. The low injection accuracy means that the amount of electrolyte inside the battery is difficult to accurately control, which will affect the uniformity and consistency of the battery, thereby affecting the overall performance of the battery.

[0004] In view of the shortcomings of the prior art, there is an urgent need for a liquid injection device that can reduce the electrolyte wall adhesion phenomenon and improve the liquid injection accuracy. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a lithium manganese iron phosphate soft-pack battery injection device, which can reduce the generation of electrolyte wall adhesion, make the actual electrolyte injected into the battery close to the set required injection amount, and improve the injection accuracy.

[0006] In order to achieve the above object, the technical solution of the present invention is as follows:

[0007] A liquid injection device for a lithium iron manganese phosphate soft-pack battery comprises a liquid injection box; a vacuum chamber and a liquid injection cavity are arranged in the liquid injection box; a fixing component and an intermittent spreading component are arranged in the vacuum chamber, the fixing component is used to fix the battery pack to be injected, and the intermittent spreading component is used to perform intermittent spreading treatment on the battery pack after the electrolyte is injected; a liquid injection needle is arranged at the bottom of the liquid injection cavity; an opening and closing component is arranged between the liquid injection cavity and the liquid injection needle, and the opening and closing component is used to control the intermittent opening and closing between the liquid injection cavity and the liquid injection needle based on the operation of the intermittent spreading component; the liquid injection needle is used to inject the electrolyte in the liquid injection cavity into the battery pack; the liquid injection cavity is also connected with a nitrogen component and a liquid injection component, the nitrogen component is used to introduce nitrogen into the liquid injection cavity, and the liquid injection component is used to transport a certain amount of electrolyte into the liquid injection cavity.

[0008] The above scheme has the following beneficial effects:

[0009] 1. In this scheme, the battery pack is fixed by a fixing component (after side sealing and top sealing, the three sides of the battery pack are all closed, and only one side is left open), and then a certain amount of electrolyte is delivered to the injection cavity by starting the injection component, and at the same time, the nitrogen component is started to introduce nitrogen into the injection cavity until the injection cavity is filled with nitrogen and electrolyte, and then the intermittent spreading component is started. Driven by the intermittent spreading component, the opening and closing component will realize intermittent connection between the injection cavity and the injection needle. When the injection cavity is connected with the injection needle, the electrolyte will be intermittently injected into the battery pack under the negative pressure of the vacuum chamber and the positive pressure in the injection cavity, that is, each time a certain amount of electrolyte is injected, the intermittent spreading component will spread both sides of the battery pack to accelerate the penetration of the electrolyte between the electrode sheet and the diaphragm. At the same time, in the process of nitrogen being discharged into the vacuum chamber, the flow of nitrogen is used to carry away the electrolyte attached to the wall of the injection cavity, thereby reducing the occurrence of wall hanging phenomenon.

[0010] In this solution, the electrolyte is intermittently injected into the battery pack through the synergistic effect of the intermittent spreading component and the opening and closing component. Compared with the existing technology, this method not only ensures the uniform distribution of the electrolyte, but also reduces the problem of excessive or insufficient electrolyte caused by continuous injection, so that the actual amount of electrolyte injected into the battery is closer to the required injection amount, significantly improving the injection accuracy.

[0011] Under the action of the nitrogen assembly, nitrogen is introduced into the injection cavity and fills the entire space together with the electrolyte. The flow of nitrogen not only helps to evenly distribute the electrolyte in the battery pack, but also effectively removes the electrolyte attached to the wall of the injection cavity, greatly reducing the occurrence of wall hanging. The use of nitrogen not only helps to reduce the wall hanging phenomenon, but also provides inert gas protection during the battery packaging process, reduces the contact between the battery and oxygen, and further improves the safety and stability of the battery.

[0012] 2. In this solution, both sides of the battery pack are spread evenly by an intermittent spreading component, which accelerates the penetration of the electrolyte between the electrode sheet and the diaphragm. Good electrolyte penetration helps the conduction of ions inside the battery, thereby improving the battery's charge and discharge performance and cycle life. During the electrolyte injection process, the intermittent spreading component not only promotes the uniform distribution of the electrolyte, but also effectively smoothes the surface of the battery pack through its spreading action. This helps to eliminate tiny wrinkles or bulges caused by surface tension or bubbles that may be generated during the electrolyte injection process.

[0013] Furthermore, the intermittent spreading assembly includes a cylinder, which is slidably matched with the injection needle; a double-wing carrier is arranged on the outside of the cylinder, and transmission assemblies are arranged at both ends of the double-wing carrier; the transmission assembly includes a longitudinal rod, a transverse cylinder, a driven rod, a first convex plate, a second convex plate and an active rod, the top of the longitudinal rod is rotatably connected to one end of the double-wing carrier, the bottom of the longitudinal rod is fixedly connected to one side of the transverse cylinder, the transverse cylinder is rotatably matched with the driven rod, the two ends of the driven rod are respectively fixedly connected to the first convex plate and the second convex plate, one end of the active rod is fixedly connected to the first convex plate, and the other end of the active rod is rotatably connected to the side wall of the vacuum chamber; a servo motor is also arranged in the injection box, and the output shaft of the servo motor is axially fixedly connected to any one of the active rods.

[0014] Beneficial effect: The servo motor drives one of the active rods to rotate, and the rotation of the active rod drives the first convex plate to rotate, which in turn drives the driven rod to rotate circumferentially with the active rod as the axis. The rotation of the driven rod drives the horizontal cylinder and the longitudinal rod to move up and down, and the longitudinal rod drives the double-wing carrier and the cylinder to move up and down along the injection needle. Every time the second convex plate rotates one circle, the opposite sides of the battery pack are scraped once, and the electrolyte on both sides of the battery pack is evenly distributed and spread, while eliminating the tiny wrinkles or bulges that may occur during the electrolyte injection process.

[0015] Furthermore, the opening and closing assembly includes a piston block, a piston tube and a plurality of touch blocks; a piston groove is provided at the bottom of the injection chamber, and the piston groove and the piston block are slidably matched; the bottom of the piston groove is also connected to a slide groove, and the bottom of the slide groove is connected to a connecting tube, and the connecting tube is connected to the injection needle; a through groove is provided in the piston block, and after the piston block moves upward by a preset distance, the through groove remains connected to the injection chamber; the bottom of the through groove is connected to the piston tube, and the piston tube and the slide groove are slidably matched; the touch blocks are circumferentially arranged at the bottom of the piston block, and the bottom of the touch blocks all pass through the piston groove and extend into the vacuum chamber, and when the cylinder moves upward by a preset height, the top of the cylinder contacts the bottom of the touch blocks respectively.

[0016] Beneficial effect: During the up and down reciprocating motion of the cylinder, when the cylinder moves upward, the top of the cylinder will press against the bottom of the touch block and lift it upward. The upward movement of the touch block will drive the piston block to move upward together until the through groove is connected with the injection chamber. At this time, the electrolyte and / or nitrogen in the injection chamber can pass through the through groove-piston tube-slide groove-connecting tube-injection needle in sequence, and finally be injected into the battery pack in the vacuum chamber; when the cylinder moves downward, the touch block will lose its supporting force, and under the influence of the positive pressure in the injection chamber and the deadweight of the piston block, the piston block will reset, so that the connection between the through groove and the injection chamber is interrupted.

[0017] Through the interaction between the up and down reciprocating motion of the cylinder and the touch block, the up and down displacement of the piston block can be accurately controlled, thereby accurately controlling the connection and disconnection between the injection chamber and the piston tube, slide groove and other channels. This design ensures that the injection process will only start when the cylinder rises to a specific height, realizing precise control of the injection timing.

[0018] Furthermore, the nitrogen assembly includes a nitrogen pipe; one end of the nitrogen pipe is connected to the liquid injection cavity, a first one-way valve is provided at the connection between the nitrogen pipe and the liquid injection cavity, and the other end of the nitrogen pipe is connected to a nitrogen tank.

[0019] Beneficial effects: The nitrogen tank stores a large amount of high-pressure nitrogen, which serves as the nitrogen source for the nitrogen assembly. It ensures that nitrogen can be quickly and stably supplied to the injection cavity when needed, meeting the nitrogen demand during the battery pack injection process.

[0020] A first one-way valve is provided at the connection between the nitrogen pipe and the liquid injection cavity. The main function of the first one-way valve is to prevent nitrogen from flowing back from the liquid injection cavity to the nitrogen pipe when not needed, thereby ensuring the stability and safety of nitrogen supply.

[0021] Furthermore, a liquid storage tank is provided in the liquid injection box; the liquid injection assembly includes a liquid injection tube and a metering pump; the two ends of the liquid injection tube are respectively connected to the liquid injection cavity and the liquid storage tank, and the metering pump is used to draw the electrolyte in the liquid storage tank into the liquid injection cavity; a second one-way valve is provided at the connection between the liquid injection tube and the liquid injection cavity.

[0022] Beneficial effects: Through the precise control of the metering pump, it can be ensured that each battery pack can obtain the right amount of electrolyte. The setting of the second one-way valve effectively prevents the backflow of electrolyte and enhances the stability and reliability of the entire injection system. This helps to reduce equipment failures and safety hazards caused by electrolyte backflow.

[0023] Furthermore, the fixing assembly includes a concave base and a splint frame; the concave base is located directly below the injection syringe, and a snap-fit ​​groove is provided on one side of the top of the concave base; a snap-fit ​​block is provided on one side of the bottom of the splint frame, and when the splint frame is inserted into the concave base, the snap-fit ​​block snaps into the snap-fit ​​groove.

[0024] Beneficial effects: The fixing assembly mainly consists of a concave base and a clamping plate frame. The concave base is located directly below the injection syringe, providing a stable support platform for the battery pack. The clamping plate frame is used to clamp and fix the battery pack to ensure that it does not move or shake during the injection process. Through the cooperation of the snap-in slot and the snap-in block, the clamping plate frame and the concave base can be easily connected and disassembled.

[0025] Furthermore, it also includes a pre-sealing component; the pre-sealing component includes a hydraulic cylinder, a telescopic rod and a hot pressing plate; the hydraulic cylinder is located in the vacuum chamber near the concave base, the output shaft of the hydraulic cylinder is axially fixedly connected to the telescopic rod, and the other end of the telescopic rod is fixedly connected to the hot pressing plate; the hot pressing plate is equipped with an electric heating tube, and when the hot pressing plate is inserted into the locking groove, the hot pressing plate and the locking groove slide together; a storage component is also provided at the bottom of the clamping frame; the storage component is used to retract the locking block.

[0026] Beneficial effect: When the liquid injection is completed and pre-sealing is required (the side of the battery pack used for liquid injection is closed, which will be referred to as the pre-sealing side below), the telescopic rod and the hot pressing plate are extended outward by the hydraulic cylinder until the hot pressing plate enters the engaging groove and pushes the engaging block back. After the clamping plate frame loses the restriction of the engaging block and the engaging groove, it will fall freely along the inner wall of the concave base until the pre-sealing side of the battery pack is flush with the engaging groove. At this time, the hydraulic cylinder and the electric heating tube are driven again to press the pre-sealing side using the hot pressing plate.

[0027] The design of the pre-sealing assembly enables the hot press plate to quickly move to the pre-sealing side of the battery pack and perform the pressing process. This greatly shortens the time required for pre-sealing and improves production efficiency.

[0028] The built-in electric heating tube of the hot press plate ensures temperature control during the pressing process, which helps to fully bond the materials. At the same time, the stable pressure provided by the hydraulic cylinder also ensures the uniformity and reliability of the pre-sealing.

[0029] The design of the storage assembly makes the retraction of the locking block and the lowering of the clamping plate rack simple and efficient.

[0030] Furthermore, the storage assembly includes a first spring, a limit block and a second spring; a movable groove is provided on one side of the bottom of the splint frame, the locking block slides in cooperation with the movable groove, and the two ends of the first spring are respectively fixedly connected to the locking block and the inner wall of the movable groove; a telescopic groove is connected to one side of the movable groove, the limit block slides in cooperation with the telescopic groove, and the two ends of the second spring are respectively fixedly connected to the limit block and the inner wall of the telescopic groove; a limit groove is also provided on the side of the locking block close to the limit block, and when the limit groove passes through the limit block, the limit block engages with the limit groove.

[0031] Beneficial effect: The design of the storage component makes the storage and fixing process of the locking block automated. Under the action of the hot pressing plate, the locking block is squeezed back into the movable groove, and the limit block automatically engages with the limit groove without manual intervention.

[0032] Furthermore, it also includes a cleaning component; the cleaning component is used to inject cleaning liquid into the liquid injection cavity; the bottom of the concave base is also connected to a waste liquid tank, and an electric control valve is also provided at the connection between the waste liquid tank and the concave base.

[0033] Beneficial effect: When the injection cavity needs to be cleaned, firstly, the cleaning liquid is injected into the injection cavity through the cleaning component. At the same time, the nitrogen component is started to allow nitrogen to flow into the injection cavity and work together with the cleaning liquid to clean the injection cavity and the inside of the injection needle.

[0034] After the cleaning is completed, the servo motor is started to control the movement of the injection needle so that the cleaning liquid intermittently passes through the injection needle to further rinse the inside of the injection needle.

[0035] Finally, the cleaning liquid after cleaning is ejected to the gap area in the middle of the concave base, and flows into the waste liquid tank to be collected. By controlling the opening of the electric control valve, the waste liquid in the waste liquid tank can be discharged.

[0036] The combined use of the cleaning component and the nitrogen component can completely remove the residue inside the injection cavity and the injection needle, ensuring that the cleanliness of the equipment meets the requirements.

[0037] By controlling the opening and closing of the electric control valve, the discharge and collection of waste liquid can be flexibly controlled.

[0038] Furthermore, an entrance is provided on one side of the vacuum chamber, and a sealing door is provided at the entrance; a vacuum component is also provided in the vacuum chamber, and the vacuum component is used to evacuate the vacuum chamber.

[0039] Beneficial effect: When liquid injection is required, first open the sealed door to place the clamping plate rack on the concave base in the vacuum chamber. Then close the sealed door and start the vacuum assembly to evacuate the vacuum chamber to a certain air pressure range.

[0040] In a vacuum environment, the injection operation can be performed more accurately and stably. After the injection is completed, open the sealed door again and take out the clamping rack and battery pack.

[0041] Performing the injection operation in a vacuum environment can eliminate the influence of air on the injection process, thereby improving the accuracy and stability of the injection. The vacuum environment helps reduce the risk of contamination of the battery pack during the injection process, thereby improving the quality and reliability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1The three-dimensional structure schematic diagram of a liquid injection device for a lithium manganese iron phosphate soft-pack battery of the present invention.

[0043] Figure 2 for Figure 1 Top view of the .

[0044] Figure 3 for Figure 2 Middle AA section view.

[0045] Figure 4 for Figure 3 A partial enlarged schematic diagram of point M in the middle.

[0046] Figure 5 for Figure 3 A partial enlarged schematic diagram of point N in the middle.

[0047] Figure 6 for Figure 4 Schematic diagram of the internal structure of the piston block.

[0048] Figure 7 The three-dimensional structural schematic diagram of an intermittent spreading component in a liquid injection device for a lithium manganese iron phosphate soft-pack battery of the present invention.

[0049] Figure 8 The present invention is a front view of a clamping plate frame in a lithium manganese iron phosphate soft-pack battery injection device.

[0050] Fig. 9 The present invention is a side view of a clamping plate frame in a lithium manganese iron phosphate soft-pack battery injection device.

[0051] The reference numerals in the drawings of the specification include: 1, liquid injection box; 2, sealing door; 3, waste liquid tank; 4, hydraulic cylinder; 5, hot pressing plate; 6, telescopic rod; 7, cleaning pipe; 8, piston block; 9, touch block; 10, liquid injection needle; 11, cylinder; 12, piston groove; 13, connecting pipe; 14, clamping plate frame; 101, vacuum chamber; 102, liquid injection cavity; 103, nitrogen pipe; 104, liquid injection pipe; 105, metering pump; 106, liquid storage tank; 107, vacuum tube; 108, concave base; 109, servo motor; 201, inlet; 801, Through groove; 802, piston tube; 1101, double-wing carrier; 1102, longitudinal rod; 1103, driven rod; 1104, first convex plate; 1105, active rod; 1106, second convex plate; 1107, scraper rod; 1108, transverse cylinder; 1401, engaging block; 1402, movable groove; 1403, first spring; 1404, telescopic groove; 1405, second spring; 1406, limit block; 1407, limit groove; 1031, first one-way valve; 1032, second one-way valve; 1081, electric control valve; 1082, engaging groove. DETAILED DESCRIPTION

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0053] In the description of the present invention, it is to be understood that the terms “longitudinal”, “lateral”, “vertical”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside” and “outside” etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0054] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0055] The following is further described in detail through specific implementation methods:

[0056] Embodiment 1 is basically as attached Figure 1-Figure 9 As shown: A liquid injection device for lithium manganese iron phosphate soft-pack batteries, comprising a liquid injection box 1; a vacuum chamber 101 and a liquid injection cavity 102 are provided in the liquid injection box 1; the vacuum chamber 101 is a closed space for creating a vacuum environment, preferably, in combination with the attached Figure 1 As shown, an entrance 201 is provided on the left side of the vacuum chamber 101 to facilitate the placement or removal of items to be processed (such as battery packs, etc.). A sealing door 2 is rotatably connected to the entrance 201 to ensure the sealing of the vacuum chamber 101 during the vacuuming process. Preferably, in order to facilitate vacuuming, a vacuum tube 107 is also connected to one side of the vacuum chamber 101, and the vacuum tube 107 is connected to a vacuum pump (not shown in the figure).

[0057] The vacuum chamber 101 is provided with a fixing assembly and an intermittent spreading assembly. The fixing assembly is used to fix the battery pack to be injected. Specifically, the fixing assembly includes a concave base 108 and a clamping plate frame 14; the concave base 108 is located directly below the injection syringe. Specifically, in combination with the attached Figure 3As shown, the concave base 108 is mainly composed of three plates, two of which are used as side plates and one is used as a bottom plate. The side plates are welded and fixed to the two sides of the bottom plate, and the whole is combined into a "concave" shape. A snap-fitting groove 1082 is set on one side of the top of the concave base 108. Specifically, the snap-fitting groove 1082 is set on the side plate on the left side of the bottom plate, and the snap-fitting groove 1082 is set along the length direction of the bottom plate. Figure 8 and attached Fig. 9 As shown, the clamping frame 14 is mainly composed of a base frame and four brackets, and the four brackets are formed into a two-finger clamp structure in pairs, which are respectively located at the head and tail ends of the base frame. A clamping block 1401 is provided on one side of the bottom of the clamping frame 14. Specifically, the clamping block 1401 is in the shape of a long strip. When the clamping frame 14 is inserted into the concave base 108, the clamping block 1401 is clamped with the clamping groove 1082. Preferably, in combination with the attached Figure 3 As shown, it also includes a pre-sealing component; the pre-sealing component includes a hydraulic cylinder 4, a telescopic rod 6 and a hot pressing plate 5; the hydraulic cylinder 4 is located in the vacuum chamber 101 near the concave base 108. Specifically, a groove for accommodating the hydraulic cylinder 4 is opened in the liquid injection box 1, and the hydraulic cylinder 4 is fixed in the groove by bolts. The output shaft of the hydraulic cylinder 4 is axially welded and fixed to the telescopic rod 6, and the right end of the telescopic rod 6 is welded and fixed to the hot pressing plate 5; the hot pressing plate 5 has an electric heating tube built in, and when the hot pressing plate 5 is inserted into the engaging groove 1082, the hot pressing plate 5 slides and fits with the engaging groove 1082.

[0058] A storage assembly is also provided at the bottom of the clamping plate frame 14. Specifically, the storage assembly includes a first spring 1403, a stop block 1406, and a second spring 1405; Fig. 9 As shown, a movable groove 1402 is provided on the left side at the bottom of the splint frame 14, and the engaging block 1401 is slidably matched with the movable groove 1402, and the two ends of the first spring 1403 are respectively welded and fixed to the right end of the engaging block 1401 and the inner wall of the movable groove 1402; the bottom of the movable groove 1402 is connected to the telescopic groove 1404, and the limit block 1406 is slidably matched with the telescopic groove 1404, and the two ends of the second spring 1405 are respectively welded and fixed to the bottom of the limit block 1406 and the inner wall of the telescopic groove 1404; a limit groove 1407 is also provided at the bottom of the engaging block 1401, and when the limit groove 1407 passes through the limit block 1406, the limit block 1406 is engaged with the limit groove 1407.

[0059] The intermittent spreading assembly is used to perform intermittent spreading of the battery pack after the electrolyte is injected; a liquid injection needle 10 is provided at the bottom of the liquid injection cavity 102, and an opening and closing assembly is provided between the liquid injection cavity 102 and the liquid injection needle 10. The opening and closing assembly is used to control the intermittent opening and closing between the liquid injection cavity 102 and the liquid injection needle 10 based on the operation of the intermittent spreading assembly; the liquid injection needle 10 is used to inject the electrolyte in the liquid injection cavity 102 into the battery pack.

[0060] Specifically, the intermittent spreading assembly includes a cylinder 11, and the cylinder 11 is slidably matched with the injection needle 10. Specifically, the injection needle 10 herein includes a syringe and a needle, wherein the syringe part is slidably matched with the cylinder 11. Figure 5 and attached Figure 7 As shown, a double-wing carrier 1101 is welded and fixed on the outside of the cylinder 11. The double-wing carrier 1101 is a symmetrical structure. Transmission components are arranged at both ends of the double-wing carrier 1101; the transmission component includes a longitudinal rod 1102, a transverse cylinder 1108, a driven rod 1103, a first convex plate 1104, a second convex plate 1106 and an active rod 1105. The top of the longitudinal rod 1102 is rotatably connected to one end of the double-wing carrier 1101, the bottom of the longitudinal rod 1102 is welded and fixed to one side of the transverse cylinder 1108, the transverse cylinder 1108 is rotatably matched with the driven rod 1103, and the two ends of the driven rod 1103 are respectively welded and fixed to the first convex plate 1104 and the second convex plate 1106, and the driving rod 1105 is combined with the attached Figure 7 As shown, in order to improve the scraping effect, a scraper rod 1107 is welded and fixed on the surface of the second convex plate 1106. One end of the active rod 1105 is welded and fixed to the first convex plate 1104, and the other end of the active rod 1105 is rotatably connected to the side wall of the vacuum chamber 101; Figure 3 As shown, a servo motor 109 is also provided in the liquid injection box 1. Specifically, a slot for accommodating the servo motor 109 is opened in the liquid injection box 1. The servo motor 109 is fixed in the slot by bolts. The output shaft of the servo motor 109 is axially welded and fixed to the active rod 1105 on the left.

[0061] Specifically, combined with Figure 4 and attached Figure 6 As shown, the opening and closing assembly mainly includes a piston block 8, a piston tube 802 and a plurality of touch blocks 9. A piston groove 12 is provided at the bottom of the injection chamber 102. Specifically, the structure of the piston groove 12 in this embodiment is "м"-shaped, and the piston groove 12 and the piston block 8 are slidably matched; a slide groove is also connected at the bottom of the piston groove 12, and a connecting tube 13 is connected at the bottom of the slide groove, and the connecting tube 13 is connected to the injection needle 10; a through groove 801 is provided in the piston block 8, as shown in the attached Figure 4 As shown, after the piston block 8 is displaced upward by a preset distance, the two ends of the through groove 801 remain connected with the injection chamber 102; the bottom of the through groove 801 is connected with the piston tube 802, and the piston tube 802 slides with the slide groove; the touch block 9 is circumferentially arranged at the bottom of the piston block 8. Specifically, in this embodiment, the touch block 9 is a cylindrical structure, and the bottom of the touch block 9 passes through the piston groove 12 and extends into the vacuum chamber 101. When the cylinder 11 is displaced upward by a preset height, the top of the cylinder 11 is respectively in contact with the bottom of the touch block 9. When the cylinder 11 continues to rise, the cylinder 11 will resist the upward displacement of the touch block 9, and finally as shown in the attached figure Figure 4 As shown, the through groove 801 is communicated with the liquid injection cavity 102 .

[0062] The liquid injection chamber 102 is also connected with a nitrogen assembly and a liquid injection assembly. The nitrogen assembly is used to introduce nitrogen into the liquid injection chamber 102. Preferably, the nitrogen assembly includes a nitrogen pipe 103; the right end of the nitrogen pipe 103 is connected with the liquid injection chamber 102, and a first one-way valve 1031 is welded and fixed at the connection between the nitrogen pipe 103 and the liquid injection chamber 102. The left end of the nitrogen pipe 103 is connected with a nitrogen tank (not shown in the figure).

[0063] The liquid injection assembly is used to deliver a certain amount of electrolyte into the liquid injection cavity 102. Figure 3 As shown, a liquid storage tank 106 is provided in the liquid injection box 1; the liquid injection assembly includes a liquid injection tube 104 and a metering pump 105; both ends of the liquid injection tube 104 are respectively connected to the liquid injection cavity 102 and the liquid storage tank 106, and the metering pump 105 is used to draw the electrolyte in the liquid storage tank 106 into the liquid injection cavity 102. Specifically, the input end of the metering pump 105 is connected to the liquid storage tank 106, and the output end of the metering pump 105 is connected to the liquid injection cavity 102; a second one-way valve 1032 is welded and fixed at the connection between the liquid injection tube 104 and the liquid injection cavity 102.

[0064] The specific implementation process is as follows:

[0065] The staff puts the battery pack into the clamping frame 14 and fixes it, then opens the sealing door 2, slides the clamping block 1401 of the clamping frame 14 along the clamping groove 1082, then closes the sealing door 2, turns on the vacuum pump to evacuate, and then turns on the metering pump 105 to deliver a preset dose of electrolyte to the injection chamber 102, turns on the nitrogen tank, and injects nitrogen into the injection chamber 102 through the nitrogen pipe 103 (initially in a vacuum state, if the injection chamber 102 is not in a vacuum state, the nitrogen tank is opened in advance to evacuate the impurity gas in the injection chamber 102, especially oxygen, and then the above steps are performed) until the injection chamber 102 is filled. 02 is filled with nitrogen and electrolyte, and then the servo motor 109 is started. At this time, the second convex plate 1106 will rotate and scrape the two sides (front and back sides) of the battery pack, and the cylinder 11 will synchronously reciprocate up and down. When the cylinder 11 moves upward, the electrolyte in the injection chamber 102 is injected into the battery pack through the injection needle 10. When the cylinder 11 moves downward, the injection is stopped. At this time, the second convex plate 1106 rotates to scrape the electrolyte just injected into the battery pack again, and the intermittent injection and scraping are repeated until the electrolyte in the injection chamber 102 is completely injected into the battery pack.

[0066] The staff turns off the servo motor 109, starts the hydraulic cylinder 4, moves the hot pressing plate 5 into the locking groove 1082, pushes the locking block 1401 into the movable groove 1402, and fixes the locking block with the limit block 1406. At this time, the locking block has completely entered the movable groove 1402, and the clamping plate frame 14 loses the restraint of the locking block 1401 and falls freely to the bottom of the concave base 108. At this time, the staff starts the hot pressing plate 5 again, and at the same time starts the electric heating tube to heat the hot pressing plate 5, and uses the hot pressing plate 5 to pre-seal the battery pack.

[0067] Finally, the nitrogen tank and the servo motor 109 are opened again to allow the nitrogen to restore the air pressure in the vacuum chamber 101 to a normal level. At this time, the sealing door 2 is opened to take out the battery pack.

[0068] The only difference between Example 2 and Example 1 is that it also includes a cleaning component; the cleaning component is used to inject cleaning liquid into the liquid injection chamber 102; preferably, the cleaning component mainly includes a cleaning liquid storage tank, a cleaning pump, a cleaning pipe 7 and other components, the cleaning liquid storage tank is used to store the cleaning liquid, the cleaning pump is used to provide the pressure of the cleaning liquid, and the cleaning pipe 7 is used to transport the cleaning liquid into the liquid injection chamber 102. A third one-way valve is welded and fixed in the cleaning pipe 7 to limit the backflow of the cleaning liquid. Figure 3 As shown, the bottom of the concave base 108 is also connected to the waste liquid tank 3, and an electric control valve 1081 is screwed fixed at the connection point between the waste liquid tank 3 and the concave base 108.

[0069] Specific implementation process: when the injection cavity 102 needs to be cleaned, the electric control valve 1081 is opened, the valve of the cleaning liquid storage tank is opened, the servo motor 109 is started, the cleaning pump is started, and the cleaning liquid flows into the injection cavity 102 through the cleaning pipe 7. Then the nitrogen tank is opened to allow nitrogen to flow into the injection cavity 102, and nitrogen acts together with the cleaning liquid to clean the injection cavity 102 and the inside of the injection needle 10.

[0070] The waste liquid is injected into the gap in the concave base 108 through the injection needle and finally flows into the waste liquid tank 3, and then the electric control valve 1081, the servo motor 109 and other driving parts are closed to complete the cleaning.

[0071] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and / or characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A liquid injection device for a lithium manganese iron phosphate soft-pack battery, comprising a liquid injection box (1); a vacuum chamber (101) and a liquid injection cavity (102) are arranged in the liquid injection box (1); the characteristics are: A fixing component and an intermittent spreading component are arranged in the vacuum chamber (101), the fixing component is used to fix the battery pack to be injected, and the intermittent spreading component is used to perform intermittent spreading treatment on the battery pack after the electrolyte is injected; a liquid injection needle (10) is arranged at the bottom of the liquid injection chamber (102); an opening and closing component is arranged between the liquid injection chamber (102) and the liquid injection needle (10), and the opening and closing component is used to control the intermittent opening and closing between the liquid injection chamber (102) and the liquid injection needle (10) based on the operation of the intermittent spreading component; the liquid injection needle (10) is used to inject the electrolyte in the liquid injection chamber (102) into the battery pack; the liquid injection chamber (102) is also connected with a nitrogen component and a liquid injection component, the nitrogen component is used to introduce nitrogen into the liquid injection chamber (102), and the liquid injection component is used to transport a certain amount of electrolyte into the liquid injection chamber (102).

2. The liquid injection device for lithium iron manganese phosphate soft pack battery according to claim 1, characterized in that: The intermittent spreading assembly comprises a cylinder (11), and the cylinder (11) and the injection needle (10) are slidably matched; a double-wing carrier (1101) is arranged outside the cylinder (11), and transmission assemblies are arranged at both ends of the double-wing carrier (1101); the transmission assembly comprises a longitudinal rod (1102), a transverse cylinder (1108), a driven rod (1103), a first convex plate (1104), a second convex plate (1106) and an active rod (1105); the top of the longitudinal rod (1102) is rotatably connected to one end of the double-wing carrier (1101), and the bottom of the longitudinal rod (1102) is rotatably connected to the double-wing carrier (1101). One side of the transverse cylinder (1108) is fixedly connected, the transverse cylinder (1108) is rotationally matched with the driven rod (1103), the two ends of the driven rod (1103) are respectively fixedly connected to the first convex plate (1104) and the second convex plate (1106), one end of the active rod (1105) is fixedly connected to the first convex plate (1104), and the other end of the active rod (1105) is rotationally connected to the side wall of the vacuum chamber (101); a servo motor (109) is also arranged in the liquid injection box (1), and the output shaft of the servo motor (109) is axially fixedly connected to any one of the active rods (1105).

3. The liquid injection device for lithium iron manganese phosphate soft pack battery according to claim 2, characterized in that: The opening and closing assembly comprises a piston block (8), a piston tube (802) and a plurality of touch blocks (9); a piston groove (12) is arranged at the bottom of the injection chamber (102), and the piston groove (12) and the piston block (8) are slidably matched; a slide groove is also connected to the bottom of the piston groove (12), and a connecting tube (13) is connected to the bottom of the slide groove, and the connecting tube (13) is connected to the injection needle (10); a through groove (801) is arranged in the piston block (8), and when the piston block (8) moves upward, a preset After the distance is reached, the through groove (801) is connected to the injection cavity (102); the bottom of the through groove (801) is connected to the piston tube (802), and the piston tube (802) and the slide groove are slidably matched; the touch block (9) is circumferentially arranged at the bottom of the piston block (8), and the bottom of the touch block (9) passes through the piston groove (12) and extends into the vacuum chamber (101); when the cylinder (11) moves upward to a preset height, the top of the cylinder (11) contacts the bottom of the touch block (9).

4. The liquid injection device for lithium manganese iron phosphate soft pack battery according to claim 3, characterized in that: The nitrogen assembly comprises a nitrogen pipe (103); one end of the nitrogen pipe (103) is connected to the liquid injection chamber (102); a first one-way valve (1031) is provided at the connection between the nitrogen pipe (103) and the liquid injection chamber (102); and the other end of the nitrogen pipe (103) is connected to a nitrogen tank.

5. The liquid injection device for lithium iron manganese phosphate soft pack battery according to claim 4, characterized in that: A liquid storage tank (106) is arranged in the liquid injection box (1); the liquid injection assembly comprises a liquid injection pipe (104) and a metering pump (105); the two ends of the liquid injection pipe (104) are respectively connected to the liquid injection cavity (102) and the liquid storage tank (106); the metering pump (105) is used to draw the electrolyte in the liquid storage tank (106) into the liquid injection cavity (102); a second one-way valve (1032) is arranged at the connection point between the liquid injection pipe (104) and the liquid injection cavity (102).

6. The liquid injection device for lithium iron manganese phosphate soft pack battery according to claim 5, characterized in that: The fixing assembly comprises a concave base (108) and a clamping plate frame (14); the concave base (108) is located directly below the injection syringe, and a clamping groove (1082) is provided on one side of the top of the concave base (108); a clamping block (1401) is provided on one side of the bottom of the clamping plate frame (14), and when the clamping plate frame (14) is inserted into the concave base (108), the clamping block (1401) is clamped with the clamping groove (1082).

7. The liquid injection device for lithium iron manganese phosphate soft-pack batteries according to claim 6, characterized in that: It also includes a pre-sealing component; the pre-sealing component includes a hydraulic cylinder (4), a telescopic rod (6) and a hot pressing plate (5); the hydraulic cylinder (4) is located in the vacuum chamber (101) on one side close to the concave base (108), the output shaft of the hydraulic cylinder (4) is axially fixedly connected to the telescopic rod (6), and the other end of the telescopic rod (6) is fixedly connected to the hot pressing plate (5); the hot pressing plate (5) is equipped with an electric heating pipe, and when the hot pressing plate (5) is inserted into the engaging groove (1082), the hot pressing plate (5) and the engaging groove (1082) are slidably matched; a storage component is also provided in the bottom of the clamping plate frame (14); the storage component is used to retract the engaging block (1401).

8. The liquid injection device for lithium iron manganese phosphate soft-pack batteries according to claim 7, characterized in that: The storage assembly comprises a first spring (1403), a stop block (1406) and a second spring (1405); a movable groove (1402) is arranged on one side of the bottom of the clamping plate frame (14); the engaging block (1401) is slidably matched with the movable groove (1402); the two ends of the first spring (1403) are respectively fixedly connected to the engaging block (1401) and the inner wall of the movable groove (1402); one side of the movable groove (1402) is connected to a telescopic groove (140 4), the limit block (1406) is slidably matched with the telescopic slot (1404), and the two ends of the second spring (1405) are fixedly connected to the limit block (1406) and the inner wall of the telescopic slot (1404) respectively; a limit slot (1407) is also provided on the side of the engaging block (1401) close to the limit block (1406), and when the limit slot (1407) passes through the limit block (1406), the limit block (1406) is engaged with the limit slot (1407).

9. The liquid injection device for lithium iron manganese phosphate soft pack battery according to claim 8, characterized in that: It also includes a cleaning component; the cleaning component is used to inject cleaning liquid into the liquid injection cavity (102); the bottom of the concave base (108) is also connected to a waste liquid tank (3), and an electric control valve (1081) is also provided at the connection between the waste liquid tank (3) and the concave base (108).

10. The liquid injection device for lithium iron manganese phosphate soft pack battery according to claim 9, characterized in that: An entrance (201) is provided on one side of the vacuum chamber (101), and a sealing door (2) is provided at the entrance (201); a vacuum component is also provided in the vacuum chamber (101), and the vacuum component is used to evacuate the vacuum chamber (101).

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