Negative pressure formation cup

Abstract

The utility model provides a negative pressure formation cup. The negative pressure formation cup comprises a cup body and a gas-liquid separation assembly, the gas-liquid separation assembly is fixedly arranged at the bottom of the cup body. By arranging the gas-liquid separation assembly in the negative pressure formation cup, the electrolyte brought out by negative pressure is separated, so that the electrolyte flows back to the battery cell, the quantity of the electrolyte flowing into the negative pressure pipeline is reduced, and the loss of the electrolyte in the negative pressure formation process is reduced. Meanwhile, the liquid storage tank is arranged on the bottom surface of the baffle plate of the gas-liquid separation assembly, so that the blocking capability of the baffle plate is improved, more electrolyte can be stored in the liquid storage tank when the electrolyte is blocked by the baffle plate, the quantity of the electrolyte flowing out upwards through the cup body is reduced, and the loss of the electrolyte in the negative pressure formation process is reduced.

Description

Technical Field

[0001] The utility model relates to the field of lithium batteries, in particular to a negative pressure formation cup. Background Art

[0002] At present, in the manufacturing process of square aluminum shell batteries, formation is an indispensable link in the production and manufacturing process of lithium batteries. This process can activate the active substances in the battery and activate the lithium battery. At the same time, the lithium salt reacts with the electrolyte to form a solid electrolyte interface (SEI) film on the negative electrode side of the lithium battery. This film can prevent the further occurrence of side reactions, thereby reducing the loss of active lithium in the lithium battery. While the SEI film is being generated, a large amount of chemical reaction gas is also generated, so negative pressure is used to discharge the gas generated by the battery during the formation process in time to avoid battery swelling.

[0003] However, when negative pressure technology is used to extract the gas, some free electrolyte will also be extracted. Generally, a funnel-shaped formation cup is connected to the upper part of the negative pressure pipeline to separate the electrolyte and the gas.

[0004] After the formation is completed, the electrolyte in the negative pressure formation cup in the prior art cannot completely flow back into the battery cell shell, resulting in a certain amount of electrolyte loss. At the same time, part of the electrolyte in the negative pressure formation cup will be drawn away by the negative pressure, and part of it will remain in the negative pressure pipe and crystallize, causing vacuum abnormality. The gas in the battery cell cannot be completely discharged, causing the battery cell to swell.

[0005] The above problems need to be solved urgently. Utility Model Content

[0006] The utility model aims to provide a negative pressure forming cup.

[0007] In order to solve the above technical problems, the utility model provides a negative pressure forming cup, comprising:

[0008] Cup body and gas-liquid separation assembly;

[0009] The gas-liquid separation component is fixedly arranged at the bottom of the cup body.

[0010] Furthermore, the gas-liquid separation component includes at least one baffle.

[0011] Furthermore, the baffle is provided with a vent hole and a liquid storage tank;

[0012] The liquid storage tank is arranged on the bottom surface of the baffle;

[0013] The baffle is horizontally arranged on the cup body.

[0014] Furthermore, the number of the baffles is N, and N is greater than or equal to 2;

[0015] The ventilation holes of two adjacent baffles are arranged alternately, and the liquid storage tanks of two adjacent baffles are arranged alternately.

[0016] Furthermore, the N baffles are arranged in layers and spaced apart by a preset distance.

[0017] Furthermore, in two adjacent baffles, the ventilation holes of the baffle on the lower layer are arranged opposite to the liquid storage grooves of the baffle on the upper layer.

[0018] Furthermore, the ventilation holes are configured into multiple groups, and each group of ventilation holes is arranged in a circular array;

[0019] The liquid storage tanks are configured into multiple groups, each group of liquid storage tanks is arranged between two adjacent groups of ventilation holes, and the multiple groups are concentrically arranged.

[0020] Furthermore, a top cover is provided on the top of the cup body;

[0021] The top cover is fixedly connected to the cup body.

[0022] Furthermore, a joint portion is provided at the bottom of the cup body;

[0023] The gas-liquid separation component is fixedly arranged on the joint portion.

[0024] Furthermore, a first negative pressure tube is fixedly provided on the top surface of the top cover;

[0025] A second negative pressure tube is arranged at the bottom of the joint part.

[0026] The beneficial effect of the utility model is that the utility model sets a gas-liquid separation component in the negative pressure formation cup to separate the electrolyte brought out by the negative pressure, so that the electrolyte flows back into the battery core, the amount of electrolyte flowing into the negative pressure pipeline is reduced, and the loss of electrolyte in the negative pressure formation process is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0028] Figure 1 It is a cross-sectional view of a negative pressure forming cup provided by an embodiment of the utility model.

[0029] Figure 2 It is a structural schematic diagram of a negative pressure forming cup provided by an embodiment of the utility model.

[0030] Figure 3 It is a cross-sectional view of the baffle provided in the embodiment of the utility model.

[0031] Figure 4 This is a distribution diagram of the vent holes of two adjacent baffles provided in an embodiment of the utility model.

[0032] In the figure: 110, cup body; 120, gas-liquid separation component; 121, baffle; 1211, vent hole; 1212, liquid storage tank; 130, joint; 140, first negative pressure tube; 150, second negative pressure tube. DETAILED DESCRIPTION

[0033] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0034] Example 1

[0035] See also Figure 1-Figure 3 This embodiment provides a negative pressure formation cup, comprising: a cup body 110 and a gas-liquid separation component 120; the gas-liquid separation component 120 is fixedly arranged at the bottom of the cup body 110. By arranging the gas-liquid separation component 120 in the negative pressure formation cup, the electrolyte brought out by the negative pressure is separated and the electrolyte is returned to the battery cell, thereby reducing the amount of electrolyte flowing into the negative pressure pipeline and reducing the loss of electrolyte during the negative pressure formation process.

[0036] The structure of the gas-liquid separation assembly 120 is described below. The gas-liquid separation assembly 120 includes at least one baffle 121. The baffle 121 is arranged horizontally. Due to the different specific gravities of the gas and the electrolyte, when the electrolyte and the gas are mixed and flow together, they encounter the obstruction of the baffle 121, and the gas will be baffled away, while the electrolyte continues to have an upward speed due to inertia. The upward electrolyte adheres to the bottom surface of the baffle 121 and is gathered together downward due to the action of gravity and discharged from the bottom of the cup body 110.

[0037] In order to improve the blocking ability of the baffle 121 to the electrolyte, in this embodiment, the baffle 121 is provided with a vent hole 1211 and a liquid storage tank 1212; the liquid storage tank 1212 is provided on the bottom surface of the baffle 121; the baffle 121 is horizontally arranged on the cup body 110. By providing the liquid storage tank 1212, the blocking ability of the baffle 121 is improved. When the electrolyte is blocked by the baffle 121, more electrolyte can be stored in the liquid storage tank 1212, reducing the amount of electrolyte flowing upward through the cup body 110, thereby reducing the loss of electrolyte during the negative pressure formation process.

[0038] In order to further reduce the amount of electrolyte carried away by negative pressure, in the present embodiment, the number of the baffles 121 is N, where N is greater than or equal to 2; the vents 1211 of two adjacent baffles 121 are staggered, and the liquid storage tanks 1212 of two adjacent baffles 121 are staggered. By using two or more layers of baffles 121, the blocking ability for the electrolyte is further improved, and the amount of electrolyte loss is reduced. At the same time, the vents 1211 and liquid storage tanks 1212 of two adjacent baffles 121 are staggered, thereby forming multiple obstructions to the airflow and completing multiple deflections. The specific distribution is as follows: Figure 4 As shown, Figure 4 The staggered distribution state of the ventilation holes 1211 of two adjacent baffles 121 is shown.

[0039] It should be noted that the N baffles 121 are arranged in layers and are spaced apart by a preset distance.

[0040] Among the two adjacent baffles 121, the vent holes 1211 of the lower baffle 121 are arranged opposite to the liquid storage tank 1212 of the upper baffle 121. The gas flowing out of the vent holes 1211 of the lower baffle 121 and the liquid storage tank 1212 of the upper baffle 121 are arranged opposite to each other.

[0041] In this embodiment, the ventilation holes 1211 are configured into multiple groups, and each group of ventilation holes 1211 is arranged in a circular array; the liquid storage tanks 1212 are configured into multiple groups, and each group of liquid storage tanks 1212 is arranged between two adjacent groups of ventilation holes 1211, and the multiple groups are concentrically arranged.

[0042] In other embodiments, the ventilation holes 1211 are configured into multiple groups, each group of ventilation holes 1211 is arranged in rows or columns, and the liquid storage tanks 1212 are configured into multiple groups, each group of liquid storage tanks 1212 is arranged between two adjacent groups of ventilation holes 1211.

[0043] In order to facilitate the installation of the formation cup, a top cover is provided on the top of the cup body 110; the top cover is fixedly connected to the cup body 110. When the negative pressure formation cup is subsequently assembled, the top cover is fixed to the cup body 110 by screws to complete the assembly of the negative pressure formation cup.

[0044] In this embodiment, a joint portion 130 is provided at the bottom of the cup body 110; the gas-liquid separation assembly 120 is fixedly provided on the joint portion 130. A first negative pressure tube 140 is fixedly provided on the top surface of the top cover; a second negative pressure tube 150 is provided at the bottom of the joint portion 130. The second negative pressure tube 150 is connected to the injection hole of the external battery cell, and the first negative pressure tube 140 is connected to the external negative pressure equipment, thereby completing the negative pressure formation of the battery cell.

[0045] The utility model sets a gas-liquid separation component 120 in the negative pressure formation cup to separate the electrolyte brought out by the negative pressure, so that the electrolyte flows back into the battery core, reducing the amount of electrolyte flowing into the negative pressure pipeline and reducing the loss of electrolyte during the negative pressure formation process.

[0046] All devices (parts without specific structure) selected in this application are universal standard parts or parts known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods. In addition, the software programs involved in this application are all prior art, and this application does not involve any improvement to the software programs.

[0047] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0049] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0050] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0051] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0052] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A negative pressure forming cup, characterized in that: include: Cup body and gas-liquid separation assembly; The gas-liquid separation component is fixedly arranged at the bottom of the cup body; The gas-liquid separation assembly includes at least one baffle; The baffle is provided with a vent hole and a liquid storage tank; The liquid storage tank is arranged on the bottom surface of the baffle; The baffle is horizontally arranged on the cup body.

2. The negative pressure formation cup according to claim 1, characterized in that: The number of the baffles is N, and N is greater than or equal to 2; The ventilation holes of two adjacent baffles are arranged alternately, and the liquid storage tanks of two adjacent baffles are arranged alternately.

3. The negative pressure formation cup according to claim 2, characterized in that: The N baffles are arranged in layers and spaced apart by a preset distance.

4. The negative pressure formation cup according to claim 3, characterized in that: In two adjacent baffles, the ventilation holes of the baffle on the lower layer are arranged opposite to the liquid storage grooves of the baffle on the upper layer.

5. The negative pressure formation cup according to claim 1, characterized in that: The ventilation holes are configured into a plurality of groups, and each group of ventilation holes is arranged in a circular array; The liquid storage tanks are configured into multiple groups, each group of liquid storage tanks is arranged between two adjacent groups of ventilation holes, and the multiple groups are concentrically arranged.

6. The negative pressure formation cup according to claim 1, characterized in that: A top cover is provided on the top of the cup body; The top cover is fixedly connected to the cup body.

7. The negative pressure formation cup according to claim 6, characterized in that: The bottom of the cup body is provided with a joint portion; The gas-liquid separation component is fixedly arranged on the joint portion.

8. The negative pressure formation cup according to claim 7, characterized in that: A first negative pressure tube is fixedly arranged on the top surface of the top cover; A second negative pressure tube is arranged at the bottom of the joint part.

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