Soft package cell capacity grading equipment

Abstract

The utility model discloses a soft package battery cell capacity grading device which comprises a material frame body, a mounting plate and a plurality of air bags are arranged in the material frame body, an inflation and deflation channel is arranged in the mounting plate, the air bags are arranged on the mounting plate in a pairwise spaced mode and communicated with the inflation and deflation channel, air bag frameworks are arranged in the air bags, and the air bag frameworks are communicated with the inflation and deflation channel. The air bag framework is vertically connected to the mounting plate, and the air control system is connected with the mounting plate. The utility model aims to solve the technical problems in the prior art, and provides the soft package battery cell capacity grading equipment which can press bubbles generated by the battery cell to flow to the side edge through the expanded air bag belt, so that the interface state of a pole piece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cells, and particularly relates to a soft-pack battery cell grading device. Background Art

[0002] At present, in the industry, when soft-pack battery cells are formed, they are basically charged to 30% of the design value, and a pressurizing method is adopted to compact the positive and negative electrode plates and the separator, which can not only generate a good SEI film, but also play a role in squeezing and exhausting gas from the electrode plates. This pressurizing method can obtain a good interface. However, for the soft-pack battery cell grading device, the battery cells are basically placed in a turnover material frame, and there is a certain gap between the battery cells and the surrounding partitions. During the testing process, all sides of the battery cells are in a free state; the grading process requires the charging amount to reach 100% of the design value. Although the package has been vacuumized before the battery cell grading, it is impossible to achieve absolute vacuum, and a small amount of gas inevitably remains. During the battery cell grading test, the highest surface temperature is normally 60°C - 65°C, which causes the tiny bubbles generated in the electrode plates to flow, gather, and expand freely, easily leaving scars on the electrode plates, forming purple spots, and affecting the quality of the electrode plate interface. Content of the Utility Model

[0003] 1. Technical Problem to be Solved by the Utility Model

[0004] The purpose of the utility model is to solve the technical problems existing in the prior art, and provide a soft-pack battery cell grading device, which can use the inflated airbag belt to press the bubbles generated by the battery cell to flow to the side, improving the state of the electrode plate interface.

[0005] 2. Technical Solution

[0006] To solve the above problems, the technical solution provided by the utility model is as follows:

[0007] A soft-pack battery cell grading device includes a material frame body, an installation plate and a plurality of airbag bags are arranged inside the material frame body. An air charging and discharging channel is arranged inside the installation plate. The plurality of airbag bags are arranged on the installation plate at intervals in pairs and are communicated with the air charging and discharging channel. An airbag bag skeleton is arranged inside the airbag bag, and the airbag bag skeleton is vertically connected to the installation plate. The device also includes a pneumatic control system connected to the installation plate.

[0008] Optionally, a self-locking air nozzle joint is arranged on the installation plate, and the pneumatic control system is detachably connected to the self-locking air nozzle joint through a quick-connect joint.

[0009] Optionally, the airbag bag skeleton is a vertical plate.

[0010] Optionally, a plurality of through holes are evenly distributed on the vertical plate.

[0011] Optionally, the pneumatic control system includes an intake pipeline, an extraction pipeline, and a charging and extraction pipeline. The intake pipeline, the extraction pipeline, and the charging and extraction pipeline are connected through a four-way joint, and the charging and extraction pipeline is connected to the mounting plate.

[0012] Optionally, a high-pressure gas source interface, a pressure regulating valve, an intake electronically controlled proportional valve, and a two-position three-way valve are sequentially arranged on the intake pipeline along the intake direction.

[0013] Optionally, a vacuum solenoid valve, a deflation electronically controlled proportional valve, and a manual air and vacuum ball valve are sequentially arranged on the extraction pipeline along the deflation direction.

[0014] Optionally, a digital display pressure gauge is connected to the four-way joint.

[0015] 3. Beneficial effects

[0016] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0017] This soft-pack battery cell grading equipment uses air pressure as the pressure source to apply a certain pressure to the large surface of the battery cell to make the electrode sheets in close contact, improving the grading electrode sheet interface quality. When the battery cell is loaded, the airbag is in a contracted state. The manipulator gripper grabs the battery cell, scans the code, and places it in the corresponding bin grid. After the bin is full, the conveyor sends the bin to the corresponding test station. The bin traveling manipulator pushes the bin into the station. After the bin is positioned, the upper ear electrode clamp on the grading equipment automatically comes over to clamp the ear. The program set by the system starts to combine the battery cell grading process and the pressure control process to achieve an optimized grading effect. During the grading test, gas substances (such as CO2, O2) are slowly produced on the electrode sheets of the battery cell to form tiny bubbles. These bubbles will slowly accumulate and polymerize into larger bubbles in a free state. The large bubbles are easily fixed at the interface. Therefore, during grading, external pressure and electrode sheet heat measures are used to make the tiny bubbles move along the electrode sheet gaps towards the unpressurized part (the side or the top airbag) to form an air channel, realizing the extrusion of bubbles to improve the electrode sheet interface effect. During the test process, the air pressure parameter control process can optimize the parameters according to product differences and the grading process to obtain the optimal process. After the test is completed, the pneumatic control system evacuates the airbag. After the vacuum value reaches the set value, the vacuum solenoid valve is closed, and the airbag is in a contracted state. Description of the drawings

[0018] Figure 1 It is a schematic structural diagram of a soft-pack battery cell grading equipment proposed by an embodiment of the present utility model;

[0019] Figure 2 It is an exploded view of a soft-pack battery cell grading equipment proposed by an embodiment of the present utility model;

[0020] Figure 3Schematic cross-sectional view of a soft-pack battery cell grading device proposed in an embodiment of the present utility model;

[0021] Figure 4 Schematic internal structure view of an airbag in a soft-pack battery cell grading device proposed in an embodiment of the present utility model;

[0022] Figure 5 Schematic system view of a pneumatic control system in a soft-pack battery cell grading device proposed in an embodiment of the present utility model;

[0023] 1. Material frame body; 2. Mounting plate; 3. Airbag; 4. Airbag skeleton; 5. Self-locking air nozzle joint; 6. Inflation pipeline; 61. High-pressure air source interface; 62. Pressure regulating valve; 63. Intake electronic control proportional valve; 7. Exhaust pipeline; 71. Vacuum solenoid valve; 72. Exhaust electronic control proportional valve; 73. Manual air valve; 8. Inflation and exhaust pipeline; 81. Digital display pressure gauge; 9. Two-position three-way valve. Specific embodiments

[0024] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and do not limit the protection scope of the present utility model.

[0025] It should be noted that when an element is referred to as being "fixed to", "disposed on", "fixedly provided on" or "mounted on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. Further, when an element is considered to be "fixedly connected" to another element, the two can be fixed in a detachable connection manner or a non-detachable connection manner, such as socket connection, snap connection, integrally formed fixation, welding, etc., which can be realized in the prior art and will not be elaborated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is perpendicular, but due to manufacturing and assembly effects, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0027] The “first” and “second” involved in the present utility model do not represent specific quantities and orders, but are merely used to distinguish names.

[0028] Combined with Figures 1-5 A soft-pack battery cell capacity dividing device of the present embodiment includes a material frame 1, a mounting plate 2 and a plurality of airbag bags 3 are arranged in the material frame 1, the mounting plate 2 is arranged along the length direction of the material frame 1, the mounting plate 2 is hollow inside to form a charging and discharging air channel, a plurality of airbag bags 3 are arranged on the mounting plate 2 at intervals and are connected to the charging and discharging air channel, an airbag bag skeleton 4 is arranged in the airbag bag 3, the airbag bag skeleton 4 is vertically connected to the mounting plate 2, and the airbag bag skeleton 4 is located in the horizontal middle position of the airbag bag 3 when the airbag bag 3 is inflated, and when the airbag bag 3 is in a vacuum state, the airbag bag 3 is attached to the airbag bag skeleton 4 to maintain an upright state to prevent the airbag bag 3 from collapsing and affecting the placement of the battery cell, and also includes an air control system connected to the mounting plate 2, and the air control system is connected to the charging and discharging air channel.

[0029] This soft pack battery cell capacity separation equipment uses air pressure as a pressure source to apply a certain pressure to the large surface of the battery cell so that the electrode piece is in close contact, thereby improving the interface quality of the product capacity separation electrode piece. When the battery cell is loaded, the airbag bag is in a contracted state. The manipulator gripper grabs the battery cell, scans the code and puts it into the corresponding material frame. After the battery cell is full, the conveyor sends the material frame to the corresponding test station. The material frame driving manipulator pushes the frame into the station. After the material frame is positioned, the electrode clamp on the capacity separation equipment automatically comes over to clamp the electrode ear. The system-set program starts to combine the battery cell capacity separation process with the pressurization control process to achieve the optimized capacity separation effect. During the capacity separation test, the battery cell electrode piece slowly produces gas substances (such as CO2, O2) to form tiny bubbles. These bubbles will slowly accumulate and aggregate into larger bubbles in a free state. Large bubbles are easily fixed on the interface, so it is necessary to use external pressure and electrode piece heat measures in the capacity separation. The tiny bubbles move along the electrode piece gap toward the unpressurized part (side or top air bag) to form an airway, so as to squeeze the bubbles and improve the electrode piece interface effect. During the test, the air pressure parameter control process can be optimized according to product differences and the volume fractionation process to obtain the optimal process. After the test is completed, the air control system vacuums the airbag bag. When the vacuum value is reached, the vacuum solenoid valve is closed and the airbag bag is in a contracted state.

[0030] As an optional solution of the present invention, a self-locking air nozzle connector 5 is provided on the mounting plate 2, and the air control system is detachably connected to the self-locking air nozzle connector 5 via a quick-plug connector. Both the quick-plug connector and the self-locking air nozzle connector are prior arts and will not be described herein. The self-locking air nozzle connector has a spring to lock the air nozzle, ensuring that the airbag bag in the material frame is always in a contracted state after being evacuated.

[0031] As an alternative embodiment of the present utility model, the airbag bag skeleton 4 is a vertical plate, which is made of metal or plastic material to improve the shaping effect of the airbag bag 3. Moreover, a number of through holes are evenly distributed on the vertical plate to ensure the efficiency during inflation and deflation.

[0032] As an alternative embodiment of the present utility model, the air control system includes an intake pipeline 6, an exhaust pipeline 7, and a charging and exhaust pipeline 8. The intake pipeline 6, the exhaust pipeline 7, and the charging and exhaust pipeline 8 are connected through a four-way joint. The charging and exhaust pipeline 8 can be respectively connected to the intake pipeline 6 and the exhaust pipeline 7 to switch the inflation and deflation states. The charging and exhaust pipeline 8 is connected to the mounting plate 2, and a quick connector is connected to the charging and exhaust pipeline 8.

[0033] As an alternative embodiment of the present utility model, a high-pressure gas source interface 61, a pressure regulating valve 62, an intake electronically controlled proportional valve 63, and a two-position three-way valve 9 are sequentially arranged on the intake pipeline 6 along the intake direction. The high-pressure gas source is provided by the factory building. A vacuum solenoid valve 71, a deflation electronically controlled proportional valve 72, and a manual vacuum ball valve 73 are sequentially arranged on the exhaust pipeline 7 along the deflation direction. The exhaust pipeline 7 is connected to a vacuum gas source or a vacuum pump. A digital display pressure gauge 81 is connected to the four-way joint; when pressurizing, the high-pressure gas is initially regulated by the pressure regulating valve 62, and then the electronically controlled proportional valve 63 is opened (the main function of the proportional valve is to regulate the gas path pressure), and it is automatically adjusted to the required air pressure according to the system setting requirements. The digital display pressure gauge 81 real-time feeds back the overall pressure of the box airbag belt. When the pressure value approaches the set value, the proportional valve reduces the valve opening and gradually closes the valve. When the gas expands due to heat and the pressure increases after a certain test time, the two-position three-way valve 9 is opened to relieve pressure (to ensure that the pressure in the gas path is always at the required parameter value), and at the same time, the proportional valve regulates the pressure so that the cell pressure always remains within the set range. Different pressure values can be set at different stages, and the system will automatically adjust; after the test is completed, the intake electronically controlled proportional valve 63 is closed, and the vacuum solenoid valve 71 (confirm that the manual vacuum ball valve 73 is in the open state before the equipment is started) and the exhaust pipeline proportional valve 72 are opened to evacuate and contract the airbag bag (the function is to prevent the manipulator from interfering with the airbag belt during the loading and unloading of the cell, the mechanical gripper from touching the airbag bag and causing damage, and the cell from touching and tilting or being ejected during inflation, etc.). When the material frame disengages from the working position, the self-locking air nozzle joint 5 plugs the air port under the action of its own spring to prevent external gas from entering the airbag bag 3.

[0034] The above schematically describes the present utility model and its embodiments. This description is not restrictive, and only one of the embodiments of the present utility model is shown in the drawings. The actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the creative purpose of the present utility model, design similar structural forms and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present utility model.

Claims

1. A soft-pack battery cell capacity division device, characterized in that: It includes a material frame, a mounting plate and a plurality of airbag bags are arranged inside the material frame, an inflation and deflation channel is arranged inside the mounting plate, a plurality of airbag bags are arranged on the mounting plate in pairs and are connected to the inflation and deflation channel, an airbag frame is arranged inside the airbag bag, and the airbag frame is vertically connected to the mounting plate, and also includes an air control system connected to the mounting plate.

2. A soft-pack battery cell capacity division device according to claim 1, characterized in that: A self-locking air nozzle connector is provided on the mounting plate, and the air control system is detachably connected to the self-locking air nozzle connector via a quick-insert connector.

3. The soft-pack battery cell capacity division device according to claim 1, characterized in that: The air bag frame is a vertical plate.

4. A soft-pack battery cell capacity division device according to claim 3, characterized in that: The vertical plate is evenly distributed with a plurality of through holes.

5. A soft-pack battery cell capacity division device according to any one of claims 1 to 4, characterized in that: The air control system includes an air intake pipeline, an air exhaust pipeline and an air charging and exhaust pipeline. The air intake pipeline, the air exhaust pipeline and the air charging and exhaust pipeline are connected through a four-way joint, and the air charging and exhaust pipeline is connected to the mounting plate.

6. The soft-pack battery cell capacity division device according to claim 5, characterized in that: The air intake pipeline is provided with a high-pressure air source interface, a pressure regulating valve, an air intake electric-controlled proportional valve and a two-position three-way valve in sequence along the air intake direction.

7. The soft-pack battery cell capacity division device according to claim 5, characterized in that: The vacuum solenoid valve, the deflation electric-controlled proportional valve and the hand-empty ball valve are arranged in sequence along the upper side of the air extraction pipeline in the deflation direction.

8. The soft-pack battery cell capacity division device according to claim 5, characterized in that: The four-way joint is connected with a digital pressure gauge.

Images