Negative pressure adjusting system and battery liquid injection machine

Abstract

The utility model discloses a negative pressure regulating system and a battery liquid injection machine. The negative pressure regulating system comprises a vacuum source, a negative pressure buffer tank, a pressure regulating valve, a throttling valve and a pneumatic control valve, an air suction port of the vacuum source is communicated with an air outlet of the hollow sealed negative pressure buffer tank; a plurality of air inlets which are distributed at equal intervals are formed in the negative pressure buffer tank; each air inlet in the negative pressure buffer tank is communicated with one end of a negative pressure pipeline; a pressure regulating valve, a throttling valve and a pneumatic control valve are arranged on each negative pressure pipeline; the other end of each negative pressure pipeline is open and is communicated with an opening in one end of a hollow sealed negative pressure station; and at least one battery is arranged in each negative pressure station. According to the utility model, the negative pressure value in the battery liquid injection process can be conveniently, reliably and accurately adjusted, and the problem of liquid overflow is effectively avoided, so that potential safety hazards caused by corrosion of a battery shell by electrolyte are prevented. And the negative pressure flow velocity in the liquid injection process of the lithium ion battery can be adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a negative pressure regulation system and a battery liquid injection machine. Background Art

[0002] Lithium-ion batteries are widely used in the fields of energy storage, new energy vehicles, etc. due to their advantages such as high energy density and long cycle life. As one of the main raw materials of lithium-ion batteries, the electrolyte is a bridge for the communication and transportation of lithium ions between the positive and negative electrodes inside the lithium-ion battery and plays an important role in the lithium-ion battery.

[0003] With the increasing requirements for the capacity and specific energy of lithium-ion batteries, the quality requirements for the electrolyte injected into the limited battery space are also increasing.

[0004] The current lithium-ion battery liquid injection process generally injects the electrolyte in the liquid injection fixture into the battery by means of positive pressure, negative pressure, or a combination of positive and negative pressures. With the improvement of the requirements for the capacity and specific energy of lithium-ion batteries, the requirements for the lithium-ion battery liquid injection process are also getting higher and higher. Therefore, it is particularly important to ensure that no overflow occurs during the liquid injection process of lithium-ion batteries. If there is an overflow problem during the liquid injection process of lithium-ion batteries, the electrolyte will corrode the battery housing, posing a safety hazard.

[0005] However, in the existing technology, due to the inability to precisely control the pressure (such as negative pressure) during the liquid injection process, it is impossible to ensure that no overflow occurs during the lithium-ion battery liquid injection process, and there is a safety hazard caused by the corrosion of the battery housing by the electrolyte.

[0006] Therefore, there is an urgent need to develop a technology that can solve the above technical problems. Summary of the Utility Model

[0007] The purpose of the utility model is to provide a negative pressure regulation system and a battery liquid injection machine in view of the technical defects existing in the prior art.

[0008] To this end, the utility model provides a negative pressure regulation system, which includes a vacuum source, a negative pressure buffer tank, a pressure regulating valve, a throttle valve, and a pneumatic control valve;

[0009] The suction port of the vacuum source is communicated with the air outlet of the hollow-sealed negative pressure buffer tank;

[0010] A plurality of air inlets are arranged on the negative pressure buffer tank at equal intervals;

[0011] Each air inlet on the negative pressure buffer tank is respectively communicated with one end of a negative pressure pipeline;

[0012] A pressure regulating valve, a throttle valve, and a pneumatic control valve are arranged on each negative pressure pipeline;

[0013] The other end of each negative pressure pipeline is open and is respectively communicated with one end opening of a hollow and sealed negative pressure station;

[0014] At least one battery is arranged in each negative pressure station.

[0015] Wherein, at least one battery with an open liquid injection valve is arranged in each negative pressure station;

[0016] and / or

[0017] The negative pressure station is specifically a vacuum sealed box.

[0018] Wherein, each air inlet of the negative pressure buffer tank is respectively connected with the air outlet of one end of a pressure regulating valve;

[0019] The air inlet of the other end of the pressure regulating valve is connected with the air outlet of one end of a throttle valve;

[0020] The air inlet of the other end of the throttle valve is connected with the air outlet of one end of a pneumatic control valve;

[0021] The air inlet of the other end of the pneumatic control valve is communicated with one end opening of the negative pressure station.

[0022] Wherein, the inner cavity of the battery housing in the negative pressure station is connected with the liquid outlet on the battery liquid injection machine.

[0023] Wherein, the liquid injection needle on the battery liquid injection machine extends into the liquid injection valve of the battery located in the negative pressure station, and the liquid outlet at the lower end of the liquid injection needle is communicated with the inner cavity of the battery housing.

[0024] Wherein, the liquid inlet of the liquid injection needle on the battery liquid injection machine is communicated with the liquid outlet of the original liquid injection pump on the battery liquid injection machine;

[0025] The liquid inlet of the liquid injection pump is connected with the liquid outlet at the lower part of the electrolyte storage container through a liquid delivery pipeline;

[0026] The liquid outlet at the lower part of the electrolyte storage container is located below the liquid level of the electrolyte stored in the electrolyte storage container.

[0027] Wherein, in each negative pressure pipeline, the pipeline distances between the pressure regulating valve, the throttle valve and the pneumatic control valve and the corresponding air inlets on the negative pressure buffer tank increase in sequence.

[0028] Wherein, the air inlets on the negative pressure buffer tank are sequentially connected with the pressure regulating valve, the throttle valve and the pneumatic control valve;

[0029] and / or

[0030] The other end of each negative pressure pipeline is respectively communicated with the top opening of a hollow and sealed negative pressure station.

[0031] Among them, three air inlets are arranged on the negative pressure buffer tank at equal intervals;

[0032] The air inlets on the three negative pressure buffer tanks are connected to one end of three negative pressure pipelines;

[0033] The other ends of the three negative pressure pipelines are respectively connected to the top openings of three hollow and sealed negative pressure workstations.

[0034] In addition, the present utility model also provides a battery liquid injection machine, including the negative pressure regulation system as described above;

[0035] The air extraction port in the negative pressure regulation system is connected to one end opening of the negative pressure workstation;

[0036] The air extraction port in the negative pressure regulation system is the other end opening of the negative pressure pipeline.

[0037] It can be seen from the technical solutions provided by the present utility model above that, compared with the prior art, the present utility model provides a negative pressure regulation system and a battery liquid injection machine, which are scientifically designed, can conveniently and reliably accurately regulate the negative pressure value during the battery liquid injection process, effectively avoid the problem of liquid overflow, thereby preventing the electrolyte from corroding the battery case and bringing potential safety hazards, and have great practical significance.

[0038] In addition, the present utility model can also regulate the negative pressure flow rate during the liquid injection process of lithium-ion batteries, which is beneficial to ensuring the stability of the negative pressure value. Brief Description of the Drawings

[0039] Figure 1 It is a structural schematic diagram of a negative pressure regulation system provided by the present utility model;

[0040] Figure 2 It is a structural schematic diagram of an embodiment of a negative pressure regulation system provided by the present utility model. Detailed Description of the Embodiment

[0041] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0042] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 thus should not be construed as a limitation to the present utility model.

[0043] In the description of this patent, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "coupling", "setting" should be understood in a broad sense. For example, it can be fixedly connected and set, or detachably connected and set, or integrally connected and set. For those of ordinary skill in the art, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality of" is two or more unless otherwise clearly and specifically defined.

[0045] See Figure 1 , Figure 2 , the present utility model provides a negative pressure regulation system, which includes a vacuum source 1, a negative pressure buffer tank 2, a pressure regulating valve 3, a throttle valve 4 and a pneumatic control valve 5;

[0046] The suction port of the vacuum source 1 is communicated with the air outlet of the hollow and sealed negative pressure buffer tank 2;

[0047] A plurality of air inlets are arranged on the negative pressure buffer tank 2 at equal intervals;

[0048] Each air inlet on the negative pressure buffer tank 2 is respectively communicated with one end of a negative pressure pipeline 100;

[0049] A pressure regulating valve 3, a throttle valve 4 and a pneumatic control valve 5 are arranged on each negative pressure pipeline 100;

[0050] The other end of each negative pressure pipeline 100 is open and is respectively communicated with one end opening of a hollow and sealed negative pressure working station 200;

[0051] At least one battery (specifically a lithium battery) is arranged in each negative pressure working station 200.

[0052] In the present utility model, specifically, within each negative pressure station 200, there is at least one battery with an open liquid injection valve.

[0053] In the present utility model, specifically, the negative pressure station can specifically be a vacuum sealing box;

[0054] In the present utility model, specifically, the inner cavity of the housing of the battery within the negative pressure station is connected to the liquid outlet on a battery liquid injection machine (i.e., the existing liquid injection device).

[0055] Specifically, the liquid injection needle on the battery liquid injection machine (i.e., the existing liquid injection device) extends into the liquid injection valve of the battery located within the negative pressure station, and the liquid outlet at the lower end of the liquid injection needle is in communication with the inner cavity of the battery housing.

[0056] Furthermore, it should be noted that the liquid inlet of the liquid injection needle on the battery liquid injection machine (i.e., the existing liquid injection device) is in communication with the liquid outlet of the original (i.e., self - contained) liquid injection pump on the battery liquid injection machine, and the liquid inlet of the liquid injection pump is in communication with the liquid outlet at the lower part of the electrolyte storage container through an infusion pipeline;

[0057] The liquid outlet at the lower part of the electrolyte storage container is located below the liquid level of the electrolyte stored within the electrolyte storage container.

[0058] In the present utility model, specifically, within each negative pressure pipeline 100, the pipeline distances between the pressure regulating valve 3, the throttle valve 4, and the pneumatic control valve 5 and the corresponding air inlet on the negative pressure buffer tank 2 increase in sequence. That is, the air inlets on the negative pressure buffer tank 2 are sequentially connected to the pressure regulating valve 3, the throttle valve 4, and the pneumatic control valve 5.

[0059] In the present utility model, specifically, the vacuum source is a vacuum generating pump.

[0060] In the present utility model, specifically, the other end of each negative pressure pipeline 100 is respectively in communication with the top opening of a hollow - sealed negative pressure station 200.

[0061] In the present utility model, specifically, the negative pressure buffer tank 2 is provided with three equally - spaced air inlets;

[0062] The air inlets on the three negative pressure buffer tanks 2 are in communication with one end of the three negative pressure pipelines 100;

[0063] The other ends of the three negative pressure pipelines 100 are respectively in communication with the top openings of three hollow - sealed negative pressure stations.

[0064] In the present utility model, specifically, each air inlet on the negative pressure buffer tank 2 is respectively connected to the air outlet at one end of the pressure regulating valve 3;

[0065] The air inlet at the other end of the pressure regulating valve 3 is connected to the air outlet at one end of the throttle valve 4;

[0066] The air inlet at the other end of the throttle valve 4 is connected to the air outlet at one end of the air control valve 5;

[0067] The air inlet at the other end of the air control valve 5 is communicated with an opening at one end of the negative pressure station 200 .

[0068] Based on the negative pressure regulating system provided by the utility model mentioned above, the utility model also provides a battery liquid filling machine, which includes the negative pressure regulating system as described above.

[0069] The air extraction port in the negative pressure regulating system (i.e., the other end opening of each negative pressure pipeline 100) is connected to the opening of one end of the negative pressure station 200;

[0070] The liquid injection module provided on the battery liquid injection machine is used to inject the electrolyte into the battery located in the negative pressure station 200 .

[0071] In order to more clearly understand the technical solution of the utility model, the working principle of the utility model is explained below.

[0072] A vacuum source 1, used for providing a negative pressure environment;

[0073] The function of the negative pressure buffer tank 2 is to maintain the stability of the negative pressure so that the independent negative pressure workstations will not affect each other. Multiple negative pressure pipelines 100 can be led out from the negative pressure buffer tank 2 and connected to the negative pressure workstations through the negative pressure pipelines 100. The number of negative pressure pipelines can be adjusted according to the actual number of negative pressure workstations required.

[0074] The pressure regulating valve (i.e., pressure regulating valve) 3 is used to adjust the negative pressure value of each negative pressure station so that each negative pressure station can always maintain a certain fixed negative pressure value without large fluctuations, that is, it can conveniently and reliably accurately adjust the negative pressure value during the battery filling process.

[0075] The throttle valve 4 is used to adjust the negative pressure flow rate of each negative pressure station, so that the speed of pumping negative pressure becomes adjustable, that is, the negative pressure flow rate during the lithium-ion battery injection process can be adjusted.

[0076] The function of the air control valve (ie, pneumatic control valve, pneumatic switch valve) 5 is to control the opening and closing of the negative pressure pipeline.

[0077] In specific implementation, the gas control valve 5 is a valve with mature existing technology, for example, a fluid control valve of model VNB104CL-8A produced by SMC (Sintered Metal Company) can be used.

[0078] In specific implementation, the pressure regulating valve 3 is a valve with mature existing technology, for example, a vacuum pressure regulating valve of model IRV20-C10 produced by SMC (Sintered Metal Company) can be used.

[0079] In specific implementation, the throttle valve 4 is a valve with mature existing technology, for example, a straight-through speed regulating valve of model PSA10-S produced by AirTac International Group can be used.

[0080] In specific implementation, the battery filling machine is an electrolyte filling device with mature existing technology, such as the automatic filling machine for aluminum shell batteries produced by Shenzhen Leader Technology Co., Ltd., model LD-LPC02, and its function is: to inject electrolyte into lithium-ion batteries (specifically, through the filling fixture in the filling module of the battery filling machine, the electrolyte is injected into the battery located in the negative pressure station 200, and the filling fixture is provided with a filling port, which can be in the form of a filling nozzle or a filling needle).

[0081] Compared with the prior art, the negative pressure regulating system and battery liquid filling machine provided by the utility model have the following beneficial effects:

[0082] 1. The utility model is a negative pressure regulating system with adjustable negative pressure value and negative pressure flow rate. It can provide a stable negative pressure system with adjustable negative pressure value and negative pressure flow rate for each negative pressure station during the injection process of lithium-ion batteries. It can accurately and effectively adjust the liquid spillage problem during the injection process, thereby avoiding the safety hazard caused by the corrosion of the battery shell by the electrolyte.

[0083] 2. The negative pressure regulating system of the utility model provides a stable negative pressure value, and the negative pressure value and negative pressure flow rate are adjustable, and can be adjusted for batteries of different models and batteries with different injection difficulties.

[0084] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A negative pressure regulation system, characterized in that, It includes a vacuum source (1), a negative pressure buffer tank (2), a pressure regulating valve (3), a throttle valve (4) and a pneumatic control valve (5); The suction port of the vacuum source (1) is communicated with the air outlet of the hollow-sealed negative pressure buffer tank (2); A plurality of air inlets are arranged on the negative pressure buffer tank (2) and are equally spaced; Each air inlet on the negative pressure buffer tank (2) is respectively communicated with one end of a negative pressure pipeline (100); A pressure regulating valve (3), a throttle valve (4) and a pneumatic control valve (5) are arranged on each negative pressure pipeline (100); The other end of each negative pressure pipeline (100) is open and is respectively communicated with one end opening of a hollow-sealed negative pressure working station (200); At least one battery is arranged in each negative pressure working station (200); 2. The negative pressure regulation system according to claim 1, wherein At least one battery with an open liquid injection valve is arranged in each negative pressure working station (200); And / or, The negative pressure working station is specifically a vacuum-sealed box.

3. The negative pressure regulation system according to claim 1, characterized in that, Each air inlet of the negative pressure buffer tank (2) is respectively connected to the air outlet at one end of the pressure regulating valve (3); The air inlet at the other end of the pressure regulating valve (3) is connected to the air outlet at one end of the throttle valve (4); The air inlet at the other end of the throttle valve (4) is connected to the air outlet at one end of the pneumatic control valve (5); The air inlet at the other end of the pneumatic control valve (5) is communicated with one end opening of the negative pressure working station (200).

4. The negative pressure regulation system according to claim 1, wherein The inner cavity of the battery case in the negative pressure working station is connected to the liquid outlet on the battery liquid injection machine.

5. The negative pressure regulating system according to claim 4, wherein The liquid injection needle on the battery liquid injection machine extends into the liquid injection valve of the battery located in the negative pressure working station, and the liquid outlet at the lower end of the liquid injection needle is communicated with the inner cavity of the battery case.

6. The negative pressure regulation system according to claim 5, wherein The liquid inlet of the liquid injection needle on the battery liquid injection machine is connected to the liquid outlet of the original liquid injection pump on the battery liquid injection machine; The liquid inlet of the liquid injection pump is connected to the liquid outlet at the lower part of the electrolyte storage container through a liquid delivery pipeline; The liquid outlet at the lower part of the electrolyte storage container is located below the liquid level of the electrolyte stored in the electrolyte storage container.

7. The negative pressure regulation system according to any one of claims 1 to 6, characterized in that, In each negative pressure pipeline (100), the pipeline distances between the pressure regulating valve (3), the throttle valve (4) and the pneumatic control valve (5) and the corresponding air inlets on the negative pressure buffer tank (2) increase in sequence.

8. The negative pressure regulating system according to claim 1, wherein The air inlets on the negative pressure buffer tank (2) are sequentially connected to the pressure regulating valve (3), the throttle valve (4) and the pneumatic control valve (5); And / or, The other end of each negative pressure pipeline (100) is respectively communicated with the top opening of a hollow-sealed negative pressure working station (200).

9. The negative pressure regulation system according to any one of claims 1 to 8, characterized in that Three equally spaced air inlets are arranged on the negative pressure buffer tank (2); The air inlets on the three negative pressure buffer tanks (2) are communicated with one end of three negative pressure pipelines (100); The other ends of the three negative pressure pipelines (100) are respectively communicated with the top openings of three hollow-sealed negative pressure working stations.

10. A battery liquid injection machine, characterized in that, It includes the negative pressure regulating system according to any one of claims 1 to 9; The air extraction port in the negative pressure regulating system is communicated with one end opening of the negative pressure working station (200); The air extraction port in the negative pressure regulating system is the other end opening of the negative pressure pipeline (100).

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