Lithium ion battery liquid injection device

Abstract

The utility model provides a lithium ion battery liquid injection device, including isobaric liquid injection mechanism, gas storage mechanism and controller, isobaric liquid injection mechanism includes at least one liquid injection chamber and at least one liquid injection cup, the liquid injection chamber is used for fixing the battery cell to be injected, the liquid injection cup is used for communicating the liquid injection port of the battery cell to be injected, and the liquid storage mechanism is used for storing the liquid injection port of the battery cell to be injected. An air inlet pipeline is arranged at the outlet end of the air storage mechanism, the air inlet pipeline is respectively communicated with the liquid injection cup and the liquid injection cavity, an adjusting valve is arranged on the air inlet pipeline, the adjusting valve is electrically connected with a controller, and the controller is used for controlling the on-off or opening degree of the adjusting valve. According to the utility model, an intermittent air inlet mode is adopted, so that the liquid injection time is shortened, and the liquid injection efficiency of the battery cell is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery liquid injection, and relates to a lithium-ion battery liquid injection device. Background Technique

[0002] With the vigorous development of new energy, lithium-ion batteries are increasingly widely used in the fields of energy storage and power due to their relatively high specific energy, long cycle life, no memory effect, and good safety performance. Due to the update of development requirements, batteries are developing towards larger volume, higher capacity, and greater specific energy, which requires higher compaction and greater liquid retention capacity inside the battery. For aluminum shell batteries, the liquid injection efficiency of the battery has become a bottleneck process restricting its production, thus posing greater challenges to the equipment iteration and process improvement of liquid injection.

[0003] At present, the liquid injection in the industry is generally in the form of isobaric liquid injection, and the holding pressure is generally between 0.4 and 0.6 MPa. However, due to the limitations of the equipment tolerance and gas transmission pipelines, the working performance of existing liquid injection equipment is at the same level, and there is no good iteration direction. The bottleneck of cell liquid injection is mainly the gas removal rate inside the pores of the electrode sheet. Only after the gas is removed in time can the electrolyte be accommodated. Content of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a lithium-ion battery liquid injection device, which realizes the adjustment of the air intake mode by optimizing the structure of the liquid injection equipment, shortens the liquid injection time, and effectively improves the liquid injection efficiency of the cell.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a lithium-ion battery liquid injection device, which includes an isobaric liquid injection mechanism, a gas storage mechanism and a controller. The isobaric liquid injection mechanism includes at least one liquid injection chamber and at least one liquid injection cup. The liquid injection chamber is used to fix the cell to be liquid-injected, and the liquid injection cup is used to connect the liquid injection port of the cell to be liquid-injected. An air intake pipeline is arranged at the outlet end of the gas storage mechanism, and the air intake pipeline is respectively connected to the liquid injection cup and the liquid injection chamber. A regulating valve is arranged on the air intake pipeline, and the regulating valve is electrically connected to the controller. The controller is used to control the on-off or opening degree of the regulating valve.

[0007] By adding a regulating valve with intermittent on-off and adjustable opening degree on the air intake pipeline providing positive pressure, the utility model can perform intermittent air intake liquid injection, control the on-off time of the regulating valve, so that the gas-liquid entering the inner cavity of the cell generates an oscillation effect, promotes the absorption of the electrolyte, and at the same time increases the number of gas-liquid collisions, thereby improving the gas removal ability of the inner cavity of the cell and enhancing the liquid injection effect.

[0008] The lithium-ion battery liquid injection device provided by the present utility model can inject liquid into a single battery cell, and can also perform liquid injection operations on multiple battery cells simultaneously. For example, multiple battery cells can be fixed at intervals in the same liquid injection chamber, and a liquid injection cup is used to supply a mixture of gas and electrolyte to different battery cells respectively. Alternatively, multiple battery cells can be fixed in different liquid injection chambers respectively, and the liquid injection cups configured in the liquid injection chambers are used to independently perform liquid injection operations.

[0009] As a preferred technical solution of the present utility model, the liquid injection chamber is connected to the intake pipe through a balance branch pipe.

[0010] In the present utility model, the gas provided by the gas storage mechanism enters the liquid injection cup and the liquid injection chamber respectively through the intake pipe and the balance branch pipe to ensure the pressure balance between the inner cavity of the battery cell and the outside. In addition, in order to more accurately control the pressure situation in the liquid injection chamber, those skilled in the art can set a regulating valve on the balance branch pipe, electrically connect it to the controller, and use the controller to control the opening degree of the regulating valve to adapt to the pressure change.

[0011] As a preferred technical solution of the present utility model, the liquid injection chamber includes an upper cover assembly and a lower cover assembly. The upper cover assembly and the lower cover assembly are buckled with each other to form a clamping chamber, and the clamping chamber communicates with the balance branch pipe.

[0012] In the present utility model, the upper cover assembly and the lower cover assembly are mutually adapted and sealed to form a clamping chamber for accommodating the battery cell to be injected with liquid, ensuring the smooth progress of the liquid injection process and improving the uniformity of liquid injection.

[0013] As a preferred technical solution of the present utility model, a pressure detection component is further arranged in the clamping chamber, and the pressure detection component is electrically connected to the controller.

[0014] The present utility model adjusts the on-off or opening degree of the regulating valve by detecting the pressure in the clamping chamber, thereby adjusting the pressure increase speed, realizing the pressure change in a very short time, ensuring the gas-liquid oscillation effect, and being beneficial to improving the electrolyte absorption efficiency.

[0015] As a preferred technical solution of the present utility model, the gas storage mechanism includes a gas storage tank and an air inflation pump. The gas storage tank is connected to the air inflation pump through a connecting pipe, and the intake pipe is connected to the outlet end of the gas storage tank.

[0016] In the present utility model, the gas provided by the gas storage tank can be nitrogen commonly used in the art or argon, and those skilled in the art can adjust according to the actual situation. In addition, to improve the flexibility and automation degree of the device, the air inflation pump can be electrically connected to the controller to realize the automatic control of the switch of the air inflation pump.

[0017] As a preferred technical solution of the present utility model, at least one diversion channel is provided on the liquid injection chamber, and both ends of the diversion channel are respectively communicated with the liquid injection cup and the clamping chamber.

[0018] In the present utility model, electrolyte with 100% injection volume is added into the liquid injection cup, so that the electrolyte flows into the liquid injection port of the battery cell through the diversion channel, enabling the electrolyte to smoothly flow into the inner cavity of the battery cell.

[0019] As a preferred technical solution of the present utility model, the liquid injection chamber is of a cuboid structure, a bell-shaped structure or a cylindrical structure.

[0020] As a preferred technical solution of the present utility model, the regulating valve is an electromagnetic on-off valve, and the controller is a PLC controller (Programmable Logic Controller).

[0021] As a preferred technical solution of the present utility model, the liquid injection cup is provided with a positive pressure inlet, a negative pressure inlet and a discharge port. The positive pressure inlet is connected to the intake air pipeline, the negative pressure inlet is connected to an external air extraction mechanism, and the discharge port is used to communicate with the outside.

[0022] The present utility model uses the negative pressure inlet to perform vacuum pumping before liquid injection, maintaining the negative pressure in the inner cavity of the battery cell at -50 to -95 KPa. During the liquid injection process, intermittent air intake is carried out through the positive pressure inlet, improving the absorption effect of the electrolyte, and using the discharge port to communicate with the outside to discharge the gas in the inner cavity of the battery cell.

[0023] As a preferred technical solution of the present utility model, the liquid injection chamber and the liquid injection cup are integrally formed.

[0024] The present utility model adopts an integrally formed liquid injection mechanism, optimizing the sealing performance of the liquid injection process, improving its stability, and at the same time reducing the adverse effects of pressure changes on the equipment, which is beneficial to improving the liquid injection effect.

[0025] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0026] A liquid injection device for a lithium-ion battery provided by the present utility model adds a regulating valve to the intake air pipeline providing positive pressure, and uses a controller for automatic control. It can perform an intermittent air intake liquid injection mode, controlling the on-off time of the regulating valve, so that the gas-liquid entering the inner cavity of the battery cell generates an oscillation effect, promoting the absorption of the electrolyte, and at the same time increasing the number of gas-liquid collisions, thereby improving the gas removal ability in the inner cavity of the battery cell and enhancing the liquid injection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of the liquid injection device for a lithium-ion battery provided in Embodiment 1.

[0028] Among them, 1 - battery cell; 2 - liquid injection chamber; 3 - liquid injection cup; 4 - upper cover assembly; 5 - lower cover assembly; 6 - diversion channel; 7 - liquid injection port; 8 - elastic element; 9 - gas storage tank; 10 - air inflation pump; 11 - intake pipeline; 12 - balance branch pipe; 13 - pressure detection assembly; 14 - clamping chamber; 15 - electromagnetic on-off valve. Specific embodiments

[0029] It should be understood that in the description of the present invention, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "plural" is two or more.

[0030] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0031] Those skilled in the art should understand that the present invention necessarily includes necessary pipelines, conventional valves, and general pump equipment for realizing the complete process. However, the above contents do not belong to the main innovation points of the present invention. Those skilled in the art can add and arrange them by themselves based on the process flow and equipment structure selection. The present invention does not make special requirements and specific limitations on this.

[0032] The technical solution of the present invention will be further described below with reference to the drawings and through specific embodiments.

[0033] In a specific embodiment, the present utility model provides a lithium-ion battery liquid injection device, which includes an isobaric liquid injection mechanism, a gas storage mechanism, and a controller. The isobaric liquid injection mechanism includes at least one liquid injection chamber and at least one liquid injection cup. The liquid injection chamber is used to fix the battery cell to be injected with liquid, and the liquid injection cup is used to connect to the liquid injection port of the battery cell to be injected with liquid. An air inlet pipe is provided at the outlet end of the gas storage mechanism, and the air inlet pipe is respectively connected to the liquid injection cup and the liquid injection chamber. A regulating valve is provided on the air inlet pipe, and the regulating valve is electrically connected to the controller. The controller is used to control the on-off or opening degree of the regulating valve. During application, according to the liquid injection volume, the battery cell volume, and the gas flow rate, the on-off interval time of the regulating valve needs to be preset in the controller, so as to control the pressure increase time and the stagnation time during the liquid injection process and ensure the efficient absorption of the electrolyte.

[0034] In some embodiments, the liquid injection chamber is connected to the air inlet pipe through a balance branch pipe. The gas provided by the gas storage mechanism enters the liquid injection cup and the liquid injection chamber respectively through the air inlet pipe and the balance branch pipe to ensure the pressure balance between the inner cavity of the battery cell and the outside. In addition, in order to more accurately control the pressure in the liquid injection chamber, those skilled in the art can set a regulating valve on the balance branch pipe, electrically connect it to the controller, and use the controller to control the opening and closing and the opening degree of the regulating valve to adapt to the pressure change.

[0035] In some embodiments, the liquid injection chamber includes an upper cover assembly and a lower cover assembly. The upper cover assembly and the lower cover assembly are buckled with each other to form a clamping cavity, and the clamping cavity is connected to the balance branch pipe. The upper cover assembly and the lower cover assembly are mutually adapted and sealed to form a clamping cavity for accommodating the battery cell, ensuring the smooth progress of the liquid injection process and improving the uniformity of the liquid injection. During the application of the present utility model, the upper cover assembly and the lower cover assembly are buckled, sealed through a sealing component, and then vacuumized, so that the inner cavity of the battery cell is in a negative pressure state.

[0036] In some embodiments, a pressure detection component is further provided in the clamping cavity, and the pressure detection component is electrically connected to the controller. By detecting the pressure in the clamping cavity of the present utility model, those skilled in the art can adjust the on-off or opening degree of the regulating valve according to the detected pressure situation, thereby adjusting the pressure increase speed, realizing the pressure change in a very short time, ensuring the gas-liquid oscillation effect, and being beneficial to improving the electrolyte absorption efficiency.

[0037] In some embodiments, the gas storage mechanism includes a gas storage tank and an air pump. The gas storage tank is connected to the air pump through a connecting pipe, and the intake pipe is connected to the outlet end of the gas storage tank. The gas provided by the gas storage tank in the present utility model can be nitrogen commonly used in the art or argon, and those skilled in the art can adjust according to actual situations. Additionally, to improve the flexibility and automation level of the device, the air pump can be electrically connected to a controller to achieve automatic control of the air pump switch.

[0038] In some embodiments, at least one diversion channel is provided on the liquid injection chamber. The two ends of the diversion channel are respectively connected to the liquid injection cup and the clamping chamber, and then connected to the electrical liquid injection port to be injected, so that the electrolyte in the liquid injection cup flows into the inner cavity of the battery cell through the diversion channel. In addition, to improve the liquid injection effect, those skilled in the art can, according to actual situations, set an elastic element at the liquid injection port of the battery cell to be injected to ensure the sealing performance at the docking part of the diversion channel and the liquid injection port, so that the electrolyte can smoothly flow into the inner cavity of the battery cell.

[0039] Specifically, the elastic element can be a rubber ring, and the diversion channel is opened on the upper cover assembly.

[0040] Specifically, the liquid injection chamber is in a cuboid structure, a bell-shaped structure or a cylindrical structure.

[0041] Specifically, the regulating valve is an electromagnetic on-off valve, and the controller is a PLC controller.

[0042] In some embodiments, the liquid injection cup is provided with a positive pressure inlet, a negative pressure inlet and a discharge port. The positive pressure inlet is connected to the intake pipe, the negative pressure inlet is connected to an external air extraction mechanism, and the discharge port is used to communicate with the outside. The present utility model uses the negative pressure inlet to perform a vacuum pumping process before liquid injection, maintaining the negative pressure in the inner cavity of the battery cell at -50 to -95 KPa. During the liquid injection process, intermittent air intake is performed through the positive pressure inlet to improve the absorption effect of the electrolyte, and the discharge port is used to communicate with the outside to discharge the gas in the inner cavity of the battery cell.

[0043] In some embodiments, the liquid injection chamber and the liquid injection cup are integrally formed. By optimizing the sealing performance of the liquid injection process, its stability is improved, and at the same time, the adverse effects of pressure changes on the equipment are reduced, which is beneficial to improving the liquid injection effect.

[0044] Specifically, the liquid injection cup and the upper cover assembly of the liquid injection chamber are integrally formed.

[0045] In some embodiments, to improve the liquid injection stability, the present utility model also provides an anti-vibration assembly at the bottom of the liquid injection chamber, adopting an anti-vibration structure commonly used by those skilled in the art to avoid large vibrations caused by rapid pressure changes, thereby interfering with the liquid injection process.

[0046] The lithium-ion battery liquid injection device provided by the present utility model can inject liquid into a single battery cell, and can also perform liquid injection operations on multiple battery cells simultaneously. For example, multiple battery cells can be fixedly spaced in the same liquid injection chamber, and the liquid injection cup is used to respectively provide a gas-liquid mixture of gas and electrolyte to different battery cells. Alternatively, multiple battery cells can be respectively fixed in different liquid injection chambers, and the liquid injection cup configured in the liquid injection chamber is used to independently perform the liquid injection operation.

[0047] To help those skilled in the art better understand the overall technical solution and working process of the present utility model, the present utility model exemplarily provides the following two specific structures of lithium-ion battery liquid injection devices that can achieve liquid injection into multiple battery cells:

[0048] (1) The isobaric liquid injection mechanism includes a large-volume liquid injection chamber and a liquid injection cup. Multiple sites for fixing battery cells are provided in the liquid injection chamber to accommodate multiple battery cells. The liquid injection chamber is provided with multiple diversion channels, and the liquid injection cup is respectively connected to the liquid injection ports of different battery cells through the multiple diversion channels. The regulating valve on the intake air pipeline is controlled, and gas is input into the liquid injection cup to form a gas-liquid mixture of electrolyte and gas, so that the gas-liquid mixture enters different battery cells through the diversion channels.

[0049] (2) The isobaric liquid injection mechanism includes multiple liquid injection chambers and liquid injection cups. Each liquid injection chamber independently accommodates a battery cell, and the liquid injection cups correspond to the battery cells one by one. The outlet end of the intake air pipeline is respectively connected to multiple liquid injection cups through multiple air supply branch pipes. The regulating valve on the intake air pipeline is controlled to respectively input gas into the liquid injection cups to form a gas-liquid mixture of electrolyte and gas, so that the gas-liquid mixture enters different battery cells.

[0050] Embodiment 1

[0051] This embodiment provides a lithium-ion battery liquid injection device, including an isobaric liquid injection mechanism, a gas storage mechanism, a controller, and a battery cell 1. As Figure 1 shown, the isobaric liquid injection mechanism includes a liquid injection chamber 2 and a liquid injection cup 3. The liquid injection chamber 2 includes an upper cover assembly 4 and a lower cover assembly 5. The upper cover assembly 4 and the lower cover assembly 5 are buckled with each other to form a clamping chamber 14, and the battery cell 1 is fixed in the clamping chamber 14. The upper cover assembly 4 and the liquid injection cup 3 are integrally formed. The upper cover assembly 4 is also provided with a diversion channel 6. The battery cell 1 is provided with a liquid injection port 7, so that the liquid injection cup 3, the diversion channel 6, and the liquid injection port 7 are sequentially connected. An elastic element 8 is arranged at the liquid injection port 7, and the diversion channel 6 is hermetically connected to the elastic element 8. The liquid injection cup 3 is provided with a positive pressure inlet, a negative pressure inlet, and a discharge port. The positive pressure inlet is connected to the gas storage mechanism, the negative pressure inlet is connected to an external air extraction mechanism, and the discharge port is used to communicate with the outside.

[0052] The gas storage mechanism includes a gas storage tank 9 and an air inflation pump 10. The gas storage tank 9 is connected to the air inflation pump 10 through a connecting pipe. An air inlet pipe 11 is provided at the outlet end of the gas storage tank 9. The air inlet pipe 11 is connected to the positive pressure inlet of the liquid injection cup 3. An electromagnetic on-off valve 15 is provided on the air inlet pipe 11. The electromagnetic on-off valve 15 is electrically connected to a controller. The controller is used to control the intermittent opening and closing of the electromagnetic on-off valve 15 or the opening degree of the electromagnetic on-off valve 15. The liquid injection chamber 2 is also connected to the air inlet pipe 11 through a balance branch pipe 12, so that the clamping chamber 14 communicates with the balance branch pipe 12. A pressure detection component 13 is further provided in the clamping chamber 14 and is electrically connected to the controller for obtaining the pressure condition in the clamping chamber 14.

[0053] Application Example 1

[0054] This application example uses the lithium-ion battery liquid injection device provided in Embodiment 1 to perform liquid injection operation on the LF280K battery, which specifically includes the following steps:

[0055] (1) Set the boost pressure target value to 0.6 MPa, and preset the boost time to 0.3 s and the stagnation time to 1 s;

[0056] (2) Place the battery in the liquid injection chamber, and fasten and fix the upper cover assembly and the lower cover assembly;

[0057] (3) Add 100% of the liquid injection volume into the liquid injection cup;

[0058] (4) Use the controller to adjust the opening and closing of the electromagnetic on-off valve according to the set value in step (1) to achieve intermittent air intake until all the electrolyte in the liquid injection cup enters the battery interior, and record the total time for completing the liquid injection.

[0059] Application Example 2

[0060] This application example uses the lithium-ion battery liquid injection device provided in Embodiment 1 to perform liquid injection operation on the LF280K battery. The difference from Application Example 1 is that: in step (1), the boost time is 0.5 s and the stagnation time is 1 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0061] Application Example 3

[0062] This application example uses the lithium-ion battery liquid injection device provided in Embodiment 1 to perform liquid injection operation on the LF280K battery. The difference from Application Example 1 is that: in step (1), the boost time is 1 s and the stagnation time is 1 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0063] Application Example 4

[0064] This application example uses the lithium-ion battery liquid injection device provided in Example 1 to perform a liquid injection operation on the LF280K battery. The difference from Application Example 1 is that in step (1), the boost time is 3 s and the stagnation time is 1 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0065] Application Example 5

[0066] This application example uses the lithium-ion battery liquid injection device provided in Example 1 to perform a liquid injection operation on the LF280K battery. The difference from Application Example 1 is that in step (1), the boost time is 3 s and the stagnation time is 1 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0067] Application Example 6

[0068] This application example uses the lithium-ion battery liquid injection device provided in Example 1 to perform a liquid injection operation on the LF280K battery. The difference from Application Example 1 is that in step (1), the boost time is 0.3 s and the stagnation time is 2 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0069] Application Example 7

[0070] This application example uses the lithium-ion battery liquid injection device provided in Example 1 to perform a liquid injection operation on the LF280K battery. The difference from Application Example 1 is that in step (1), the boost time is 0.5 s and the stagnation time is 2 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0071] Application Example 8

[0072] This application example uses the lithium-ion battery liquid injection device provided in Example 1 to perform a liquid injection operation on the LF280K battery. The difference from Application Example 1 is that in step (1), the boost time is 1 s and the stagnation time is 2 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0073] Application Example 9

[0074] This application example uses the lithium-ion battery liquid injection device provided in Example 1 to perform a liquid injection operation on the LF280K battery. The difference from Application Example 1 is that in step (1), the boost time is 1 s and the stagnation time is 1 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0075] Application Example 10

[0076] This application example uses the lithium-ion battery liquid injection device provided in Example 1 to perform a liquid injection operation on the LF280K battery. The difference from Application Example 1 is that in step (1), the boost time is 3 s and the stagnation time is 2 s, and the remaining steps and parameters are the same as those in Application Example 1.

[0077] Comparative Application Example 1

[0078] In this comparative application example, the lithium-ion battery filling device provided in Embodiment 1 was used to directly and uniformly increase the pressure for filling the LF280K battery, which specifically included the following steps:

[0079] (1) Set the target value of the boost pressure to 0.6 MPa;

[0080] (2) Place the battery in the filling chamber, and fasten and fix the upper cover assembly and the lower cover assembly;

[0081] (3) Add 100% of the filling volume into the filling cup;

[0082] (4) Use the controller to adjust the opening of the electromagnetic on-off valve, input gas into the filling cup until the pressure reaches 0.6 MPa, stop the gas intake, and record the total filling time.

[0083] The present utility model calculated the improvement efficiency (improvement efficiency = total time of comparative application example 1 / total time of application example) based on the total filling time of Application Examples 1 to 10 and Comparative Application Example 1. The results are shown in Table 1.

[0084] Table 1

[0085]

[0086]

[0087] It can be easily seen from Table 1 that when both the boost time and the stagnation time are short, the time taken for Application Examples 1 to 10 to complete 100% of the filling volume is reduced, and the improvement efficiency is as high as 40%. Application Examples 1 to 10 adopt an intermittent gas intake method, which causes the gas-liquid in the filling cup to oscillate, increasing the probability of removing the internal gas of the battery and promoting the absorption of the electrolyte, thereby effectively reducing the filling time. In contrast, Comparative Application Example 1 adopts a direct boost mode, and the pressure on the electrode sheet pores in the inner cavity of the battery cell is always in the same direction, without an oscillation effect, resulting in a reduction in filling efficiency.

[0088] The applicant declares that the above description is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model fall within the protection scope and the disclosure scope of the present utility model.

Claims

1. A lithium-ion battery injection device, characterized in that: It includes an isobaric liquid injection mechanism, an air storage mechanism and a controller. The isobaric liquid injection mechanism includes at least one liquid injection chamber and at least one liquid injection cup. The liquid injection chamber is used to fix the battery cell to be injected, and the liquid injection cup is used to connect to the injection port of the battery cell to be injected. The outlet end of the gas storage mechanism is provided with an air intake pipe, and the air intake pipe is respectively connected to the liquid injection cup and the liquid injection chamber. The air intake pipe is provided with a regulating valve, and the regulating valve is electrically connected to the controller. The controller is used to control the on-off or opening degree of the regulating valve.

2. The lithium-ion battery injection device according to claim 1, characterized in that: The liquid injection chamber is connected to the air intake pipeline through a balancing branch pipe.

3. The lithium-ion battery injection device according to claim 2, characterized in that: The liquid injection chamber comprises an upper cover assembly and a lower cover assembly, and the upper cover assembly and the lower cover assembly are buckled with each other to form a clamping cavity, and the clamping cavity is connected to the balancing branch pipe.

4. The lithium-ion battery injection device according to claim 3, characterized in that: A pressure detection component is also provided in the clamping cavity, and the pressure detection component is electrically connected to the controller.

5. The lithium-ion battery injection device according to claim 1, characterized in that: The gas storage mechanism comprises an air storage tank and an air pump. The air storage tank is connected to the air pump via a connecting pipe, and the air intake pipe is connected to the outlet end of the air storage tank.

6. The lithium-ion battery injection device according to claim 3, characterized in that: At least one guide channel is arranged on the liquid injection chamber, and two ends of the guide channel are respectively connected with the liquid injection cup and the clamping cavity.

7. The lithium-ion battery injection device according to claim 1, characterized in that: The liquid injection chamber is a rectangular parallelepiped structure, a bell-shaped structure or a cylindrical structure.

8. The lithium-ion battery injection device according to claim 1, characterized in that: The regulating valve is an electromagnetic on-off valve, and the controller is a PLC controller.

9. The lithium-ion battery injection device according to claim 1, characterized in that: The liquid injection cup is provided with a positive pressure inlet, a negative pressure inlet and a discharge port, the positive pressure inlet is connected to the air intake pipe, the negative pressure inlet is connected to an external air extraction mechanism, and the discharge port is used to communicate with the outside world.

10. The lithium-ion battery injection device according to claim 1, characterized in that: The liquid injection chamber and the liquid injection cup are integrally formed.

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