Removable multifunctional soft pack battery mold

Abstract

The patent of this invention discloses a detachable multifunctional soft-pack battery mold, which belongs to the field of new energy battery testing and electrode material research. This device can allow large-area multi-layer electrode sheets to be assembled into a test device similar to a soft-pack battery in a glove box, and simplify the soft-pack battery formation and packaging steps. During the electrochemical charging and discharging process, the generated by-products can be synchronously analyzed by external instruments such as gas phase mass spectrometers. The temperature during the battery test can be monitored by a temperature sensor. At the same time, the sample table also has a design for two-electrode and three-electrode testing. The mold involved in the patent of this invention is suitable for enterprises that do not have drying rooms, scientific research institutes, universities and other units to conduct research on new energy electrode materials, and it is easy to install and disassemble, and is sturdy and durable.

Description

Technical Field

[0001] The patent of this invention relates to a detachable multifunctional soft-pack battery mold, which belongs to the field of auxiliary experimental equipment for battery research. The assembly of the soft-pack battery can be completed in a glove box. The device also has the ability to perform three-electrode electrochemical testing, and can also simultaneously detect the by-products generated by the soft-pack battery during the formation process and the circulation process through the detection equipment connected to the device. Background Art

[0002] Soft-pack batteries are widely used in electric vehicles, energy storage, digital products and other fields. The production process of soft-pack batteries includes partial packaging, liquid injection, sealing, formation, exhaust, and secondary sealing. The instruments required include battery packaging machines, electrode sheet cutting machines, ultrasonic tab welding machines, etc. At the same time, the operating environment requirements are high. In order to ensure the true performance of the battery, it is necessary to operate in a dry room or put the instrument in a glove box for operation. These complex preparation processes have hindered the development of new electrode materials, new electrolytes, etc. to a certain extent. Most scientific research institutes and universities do not have the infrastructure for preparing and researching soft-pack batteries. In order to make up for the shortcomings of the current preparation method, popularize the research on soft-pack batteries and promote the development of new energy batteries, the patent of this invention proposes a method for preparing soft-pack batteries that can be assembled in a glove box. The detachable soft-pack battery device involved in this patent is connected to an external test instrument through an outlet, and the gas byproducts generated during the cycle can be detected at any time. At the same time, the device can evenly pressurize the electrode sheet. After being connected to the vacuum device, the formation process is carried out under negative pressure. These measures are conducive to the formation of uniform and stable SEI. This device is suitable for the research and development of soft-pack batteries. The design of this device is universal and applicable to different battery systems. It has a compact appearance and can be easily modified to meet different test requirements. It can perform two-electrode and three-electrode tests at the same time. It is easy to assemble, has a small internal resistance, good repeated measurement stability, and can be reused for a long time. Summary of the invention

[0003] As mentioned above, the assembly of soft-pack batteries is a relatively complicated process, which usually requires a strict experimental environment, and there is still a lack of universal research and development equipment. In view of this situation, the patent of the present invention provides a simple and easy assembly method and device for soft-pack batteries. In order to achieve the above purpose, the technical solution adopted by the patent of the present invention is: preparing a detachable multifunctional soft-pack battery mold, which is characterized by the main external structure of the device consisting of a device body (01), a device body upper cover (02), a fixing nut (03), a working electrode connecting nut (041), a counter electrode connecting nut (042), a reference electrode connecting nut (043), a multi-core aviation plug connection (044 and 045), a gas inlet and outlet 1 (051), and a gas inlet and outlet 2 (052), which have a closed space inside for placing battery cells (06) and are equipped with different heights. The partition (07) and multiple springs (08) are used to adjust the spatial distance when the thickness of the battery cells is different. The working electrode connecting nut (041), the counter electrode connecting nut (042), and the reference electrode connecting nut (043) are connected to the positive and negative electrodes in the inner cavity of the device, and three-electrode testing can also be achieved. Through the multi-core aviation plug connection (044 and 045), a multi-head temperature sensor can be connected to monitor the temperature of different positions of the electrode sheet. Through the gas inlet and outlet nuts 1 (051) and the gas inlet and outlet nuts 2 (052), the inner cavity of the device can be evacuated and the by-products generated during the circulation process can be discharged for real-time monitoring. An external pressure sensor can also be connected to monitor the pressure in the cavity.

[0004] A sealing O-ring or a sealing gasket is provided between the device body (01) and the device body upper cover (02), and the device is fixed using a fixing nut (03), thereby omitting the heat sealing step required in the usual soft-pack battery preparation process.

[0005] During the electrode assembly process, after the electrolyte is added to the above-mentioned device, it is connected to the vacuum device through the gas inlet and outlet 1 (051) or the gas inlet and outlet 2 (052), thereby generating negative pressure, allowing the electrolyte to quickly penetrate into the electrode material under negative pressure, thereby improving battery performance.

[0006] The above-mentioned working electrode connecting nut (041), counter electrode connecting nut (042), and reference electrode connecting nut (043) can be used interchangeably. At the same time, according to the shapes of different electrode sheets, the positions of the working electrode connecting nut (041), counter electrode connecting nut (042), and reference electrode connecting nut (043) can also be changed arbitrarily on the device body (01).

[0007] The above-mentioned gas inlet and outlet 1 (051) and gas inlet and outlet 2 (052) can be connected to a vacuum device to discharge the gas generated during the formation process at any time, and can also be connected to an external testing device to export the by-products generated during the formation and circulation to the external testing device for real-time monitoring.

[0008] The gas inlet and outlet 1 (051) and gas inlet and outlet 2 (052) of the above-mentioned device can be replaced with vacuum valves, which are used to connect the vacuum device to export gas during the formation process and ensure the airtightness of the device during the test process, thereby eliminating the secondary packaging process.

[0009] The above-mentioned device is provided with two multi-core aviation plug connections (044 and 045), which can be connected to multi-head temperature sensors. The sensors are placed at different positions of the electrode sheet to monitor the temperature of the electrode sheet during the cycle. Multiple aviation plugs can also be placed as needed to connect different sensors, such as pressure sensors.

[0010] The inner cavity of the above-mentioned device is equipped with partitions (07) of different heights and multiple springs (08) for adjusting the spatial distance when the thickness of the battery cell is different, so as to ensure the pressure on the battery cell. This design can save the aluminum-plastic film shell punching process involved in the usual soft-pack battery preparation process. The overall design of the device can save the clamp used to apply pressure to the battery cell during the formation process. The above-mentioned device is equipped with partitions (07) of different heights and multiple springs (08) for adjusting the spatial distance when the thickness of the battery cell is different, clamping the electrode material, and preventing the diaphragm from deforming and wrinkling during the cycle.

[0011] The above-mentioned device is made of PEEK and aluminum alloy materials with negative electrode oxidation on the surface. It is resistant to high temperatures and has a small size. It can be used in conjunction with a heating device for formation and testing at different temperatures.

[0012] The beneficial effect of the patent of this invention is to provide a multifunctional soft-pack battery mold that can perform three-electrode electrochemical testing on large-area electrode materials. The device is simple to assemble and maintain, and is suitable for long-term cycle testing and repeated use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 . Schematic diagram of the overall appearance of the detachable multifunctional soft-pack battery mold.

[0015] Figure 2 . Schematic diagram of the cross-section of the internal structure of the detachable multifunctional soft-pack battery mold.

[0016] Figure 3 .Schematic diagram of the rear view of the detachable multifunctional soft-pack battery mold.

[0017] In the figure, 01. Device body, 02. Device body upper cover, 03. Fixing nut, 041. Working electrode connecting nut, 042. Counter electrode connecting nut, 043. Reference electrode connecting nut, 044 and 045. Multi-core aviation plug connection, 051. Gas inlet and outlet 1, 052. Gas inlet and outlet 2, 06. Battery cell, 07. Partition, 08. Shrapnel. DETAILED DESCRIPTION

[0018] [Example 1]

[0019] The formation process plays a vital role in the performance of soft-pack batteries. Lithium-ion soft-pack batteries form SEI films through the formation process, and the quality of the SEI film determines the cycle performance of the battery. The gases that may be generated in the formation process of commonly used soft-pack batteries have nowhere to be released, affecting the thickness and uniformity of the SEI on the surface of the negative electrode material. The sample table involved in the patent of this invention can always remove the gases generated in the formation process without affecting the electrochemical determination of the battery, and is suitable for research and testing of new electrodes, new electrolytes, etc. The device involved in the patent of this invention can simplify the secondary packaging process in the preparation process of commonly used soft-pack batteries.

[0020] like Figure 1 , Figure 2 and Figure 3 As shown, the device involved in the present invention is composed of a device body 01, a device body upper cover 02, a fixing nut 03, a working electrode connecting nut 041, a counter electrode connecting nut 042, a reference electrode connecting nut 043, a multi-core aviation plug connection 044 and 045, a gas inlet and outlet (1) 051, and a gas inlet and outlet (2) 052, which constitute the main external structure of the device, and have a closed space inside, in which a battery cell 06 can be placed, and are equipped with partitions 07 of different heights and a plurality of springs 08 for adjusting the spatial distance when the thickness of the battery cells is different, the working electrode connecting nut 041, the counter electrode connecting nut 042, and the reference electrode connecting nut 043 are connected to the positive and negative electrodes of the electrode sheet or the reference electrode in the inner cavity of the device.

[0021] When in use, in a glove box, place the device body 01 steadily, place the electrode sheet, diaphragm, and electrolyte into the device body 01 according to the experimental requirements, connect the positive and negative electrodes of the electrode sheet to the working electrode connection nut 041 and the counter electrode connection nut 042. In the three-electrode test, the three electrodes are connected to the reference electrode connection nut 043. Then, according to the height of the assembled battery cell, select a partition 07 of different heights, place multiple springs 08 on the partition 07. The selection of the partition 07 is based on applying appropriate pressure to the electrode sheet. Then place the device body cover 02 and fix it with the fixing nut 03. Test the air tightness of the device through the gas inlet and outlet (1) 051 or the gas inlet and outlet (2) 052. In the formation stage, the device can be placed in a temperature control device, and a vacuum valve can be installed at the gas inlet and outlet (1) 051 or the gas inlet and outlet (2) 052, and connected to the vacuum device to generate negative pressure in the device cavity. During electrochemical testing, the working electrode connecting nut 041, the counter electrode connecting nut 042, and the reference electrode connecting nut 043 are connected to an external electrochemical workstation for testing.

[0022] [Example 2]

[0023] In actual research, byproducts are produced during the formation stage or high voltage cycle. The study of byproducts can help further understand the principle of battery failure. The gas inlet and outlet nut 1 (051) and the gas inlet and outlet nut 2 (052) can be used to monitor the byproducts in the inner cavity of the device.

[0024] The usage is as in [Example 1], and the gas inlet and outlet nuts are connected to an external detection device, such as a gas chromatograph.

[0025] [Example 3]

[0026] The thermal effect generated during high current charging and discharging is also one of the causes of battery failure. Monitoring the temperature of the electrode sheet provides new clues for further understanding the principle of battery failure. The device connects 044 and 045 through a multi-core aviation plug, and can be connected to a multi-head temperature sensor for monitoring the temperature experiment at different positions of the electrode sheet. The micro temperature sensor is connected to the multi-core aviation plug 044 and 045 in the inner cavity of the device, and the micro temperature sensor can be distributed at different positions of the electrode sheet.

[0027] The installation method is as in [Example 1], where the multi-core aviation plug is connected to 044 and 045, and the outer end is to be connected to a temperature reading device.

Claims

1. A detachable multifunctional soft pack battery mold, characterized by: The device is composed of a device body (01), a device body upper cover (02), a fixing nut (03), a working electrode connecting nut (041), a counter electrode connecting nut (042), a reference electrode connecting nut (043), a multi-core aviation plug, a gas inlet and outlet 1 (051), and a gas inlet and outlet 2 (052) to form the main external structure of the device, and a closed space is provided inside to place a battery cell (06), and is equipped with partitions (07) of different heights and a plurality of springs (08) for adjusting the spatial distance when the thickness of the battery cells is different. The working electrode connecting nut (041), the counter electrode connecting nut (042), and the reference electrode connecting nut (043) are connected to the positive and negative electrodes in the inner cavity of the device to realize three-electrode testing. A multi-head temperature sensor is connected through a multi-core aviation plug to monitor the temperature of different positions of the electrode sheet. The inner cavity of the device is evacuated through the gas inlet and outlet nut 1 (051) and the gas inlet and outlet nut 2 (052), and the by-products generated during the circulation process are exported to the spectrometer for real-time monitoring, or an external pressure sensor is connected to monitor the pressure in the cavity.

2. The detachable multifunctional soft-pack battery mold according to claim 1 is characterized in that: A sealing O-ring or a sealing gasket is provided between the device body (01) and the device body upper cover (02), and the device is fixed using a fixing nut (03), thereby omitting the heat sealing step required for the preparation of a conventional soft-pack battery.

3. The detachable multifunctional soft-pack battery mold according to claim 1 is characterized in that: After the electrolyte is added, it is connected to a vacuum device through gas inlet and outlet 1 (051) or gas inlet and outlet 2 (052), thereby generating negative pressure, allowing the electrolyte to quickly penetrate into the electrode material under negative pressure, thereby improving battery performance.

4. The detachable multifunctional soft-pack battery mold according to claim 1 is characterized in that: The working electrode connecting nut (041), the counter electrode connecting nut (042), and the reference electrode connecting nut (043) are used interchangeably. At the same time, according to the shapes of different electrode sheets, the positions of the working electrode connecting nut (041), the counter electrode connecting nut (042), and the reference electrode connecting nut (043) can be changed arbitrarily on the device body (01).

5. The detachable multifunctional soft-pack battery mold according to claim 1 is characterized in that: The gas inlet and outlet 1 (051) and the gas inlet and outlet 2 (052) are connected to a vacuum device to discharge the gas generated during the formation process at any time, or connected to an external testing device to guide the by-products generated during the formation and circulation out of the device for real-time monitoring on the external testing device.

6. The detachable multifunctional soft-pack battery mold according to claim 1 is characterized in that: The gas inlet and outlet 1 (051) and gas inlet and outlet 2 (052) of the device are replaced with vacuum valves, which are used to connect the vacuum device to export gas during the formation process and ensure the airtightness of the device during the test process, thereby eliminating the secondary packaging process.

7. The detachable multifunctional soft-pack battery mold according to claim 1 is characterized in that: The device is equipped with two multi-core aviation plugs to connect multi-head temperature sensors. The sensors are placed at different positions of the electrode sheet to monitor the temperature of the electrode sheet during the cycle. Multiple aviation plugs can be placed as needed to connect different sensors.

8. The detachable multifunctional soft-pack battery mold according to claim 1 is characterized in that: Partition plates (07) with different heights and a plurality of spring sheets (08) are provided to adjust the spatial distance when the thickness of the battery cells is different, so as to ensure the pressure on the battery cells.

9. The detachable multifunctional soft-pack battery mold according to claim 1, characterized in that: By providing partitions (07) with different heights and a plurality of spring pieces (08), the spatial distance when the thickness of the battery cells is different can be adjusted to clamp the electrode material, thereby preventing the diaphragm from deforming and generating wrinkles during the cycle.

10. The detachable multifunctional soft-pack battery mold according to claim 1, characterized in that: The device is made of PEEK and aluminum alloy materials with negative electrode oxidation on the surface. It is resistant to high temperatures and has a small size. It is used in conjunction with a heating device for formation and testing at different temperatures.

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