Detection device for gas production rate in battery cell formation

Abstract

A socket head comprises a gas guide seat and a mounting seat, the gas guide seat extends into the mounting seat, a gas inlet channel with a T-shaped section is formed in the gas guide seat, the gas guide seat comprises a threaded column, the bottom of the threaded column is fixedly connected with a connecting rod, and the connecting rod is fixedly connected with the mounting seat. A first communicating groove is formed in the mounting seat, a spherical groove is formed in the middle of the first communicating groove, and a first limiting ball block just contained in the spherical groove is fixedly connected to the outer side of the connecting rod in a sleeving mode. And when the detection device is pulled out, the air guide seat is moved, so that the air inlet of the air inlet channel is located in the mounting seat, air in the spherical air bag cannot overflow, and the effect of protecting the environment is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery production, and in particular to a device for detecting gas production during battery formation. Background Art

[0002] Formation is a crucial step in lithium-ion battery manufacturing. This process produces gases such as CO2, CH4, C2H2, and H2. The presence of these gases can lead to performance degradation, increased internal resistance, and swelling and deformation in lithium-ion batteries. Formation gas production significantly impacts the battery's electrochemical performance, cycling performance, and safety, making research on this process crucial.

[0003] Patent publication number CN 221630834 U discloses a device for detecting gas production during battery cell formation. The device comprises a socket head and a spherical airbag. An air inlet duct is located in the center of the socket head. One end of the duct is connected to the spherical airbag, and the other end is sealed to the battery cell's liquid injection port. This device allows for quick and effective evaluation of battery cell formation gas production, assessing the effectiveness and rationality of process parameter settings and providing a theoretical basis for consistent research on formed cells.

[0004] However, in the above patent, the socket head and the liquid injection port of the battery cell are sealed and connected using AB glue. When the AB glue is destroyed and the socket head is removed from the battery cell, the gas in the airbag is likely to leak and cause air pollution. Summary of the Invention

[0005] The purpose of the present invention is to provide a device for detecting gas production during battery formation to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solution: a device for detecting the gas production amount of a battery cell, comprising: a socket head, the socket head comprising a gas guide seat and a mounting seat, the gas guide seat extending into the mounting seat, an air intake channel with a T-shaped cross-section defined in the gas guide seat, the gas guide seat comprising a threaded column, a connecting rod fixedly connected to the bottom of the threaded column, a first connecting groove defined in the mounting seat, a spherical groove defined in the middle of the first connecting groove, a first limiting ball block fixedly sleeved on the outer side of the connecting rod to accommodate the spherical groove,

[0007] When the air inlet of the air inlet channel is located in the mounting seat, the first limiting ball block is located in the spherical groove. When the air inlet of the air inlet channel extends out of the mounting seat, the first limiting ball block moves downward and squeezes into the first connecting groove.

[0008] Furthermore, a second connecting groove is opened in the mounting seat, the second connecting groove is located below the first connecting groove and is connected to each other, a second limiting ball block is fixedly connected to the bottom of the connecting rod, and the air inlet of the air intake channel is located on the second limiting ball block.

[0009] Furthermore, an annular groove coaxial with the second communicating groove is formed on the bottom of the mounting seat.

[0010] Furthermore, a sliding groove is provided in the mounting seat and is connected to the first communicating groove and is located above the first communicating groove. A threaded column is fixedly connected to the top of the connecting rod, and the threaded column is threadedly connected to the sliding groove.

[0011] Furthermore, the mounting seat is inserted into the battery cell liquid injection port, and the top extension portion of the mounting seat is located outside the battery cell liquid injection port and is sealed and connected using AB glue.

[0012] Furthermore, the air outlet at the top of the threaded column and the air inlet of the spherical airbag are sealed and connected using AB glue.

[0013] Furthermore, the threaded portion of the mounting seat is made of hard clinker material.

[0014] Furthermore, the entire gas guide seat is made of hard plastic.

[0015] In the above technical solution, the present invention provides a device for detecting gas production during battery cell formation, which has the following beneficial effects:

[0016] The present invention changes the position of the air guide seat in the mounting seat. When the detection device is installed, the first limiting ball block squeezes the first connecting groove, causing the mounting seat to deform and squeeze into the battery cell liquid injection port, thereby enhancing the sealing performance of the detection device during detection. When the detection device is pulled out, the air guide seat is moved so that the air inlet of the air inlet channel is located in the mounting seat, preventing the gas in the spherical airbag from overflowing, thereby protecting the environment.

[0017] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

[0018] This application document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a comprehensive disclosure of the full scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Provides a working state diagram for an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of the embodiment of the present invention during removal is provided;

[0022] Figure 3 A schematic structural diagram of an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Socket head; 11. Air guide seat; 111. Air inlet channel; 112. First limiting ball block; 113. Second limiting ball block; 114. Connecting rod; 115. Threaded column; 12. Mounting seat; 121. Slide groove; 122. First connecting groove; 123. Spherical groove; 124. Second connecting groove; 125. Annular groove; 2. Spherical airbag; 21. Centerline groove; 3. Battery cell filling port; 4. Battery cell. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0026] See also Figure 1-Figure 3 A device for detecting gas production during battery formation comprises a socket head 1, characterized in that the socket head 1 comprises an air guide seat 11 and a mounting seat 12, the air guide seat 11 extending into the mounting seat 12, an air inlet passage 111 with a T-shaped cross section is defined in the air guide seat 11, the air guide seat 11 comprises a threaded column 115, a connecting rod 114 is fixedly connected to the bottom of the threaded column 115, a first connecting groove 122 is defined in the mounting seat 12, a spherical groove 123 is defined in the middle of the first connecting groove 122, a first limiting ball block 112 is fixedly sleeved on the outer side of the connecting rod 114 to just accommodate the spherical groove 123,

[0027] When the air inlet of the air inlet channel 111 is located in the mounting seat 12 , the first limiting ball block 112 is located in the spherical groove 123 . When the air inlet of the air inlet channel 111 extends out of the mounting seat 12 , the first limiting ball block 112 moves downward and squeezes into the first connecting groove 122 .

[0028] By changing the position of the air guide seat 11 in the mounting seat 12, when the detection device is installed, the air guide seat 11 is moved downward. Since the first limiting ball block 112 squeezes the first connecting groove 122, the mounting seat 12 is deformed and squeezed into the battery cell liquid filling port 3, thereby enhancing the sealing performance of the detection device during detection. When the detection device is pulled out, the air guide seat 11 is moved upward so that the air inlet of the air inlet channel 111 is located in the mounting seat 12, so that the gas in the spherical airbag 2 cannot overflow, thereby protecting the environment.

[0029] Furthermore, a second communicating groove 124 is provided in the mounting seat 12, and the second communicating groove 124 is located below the first communicating groove 122 and is connected to each other. The bottom of the connecting rod 114 is fixedly connected to a second limiting ball block 113, and the air inlet of the air inlet channel 111 is located on the second limiting ball block 113. An annular groove 125 coaxial with the second communicating groove 124 is provided on the bottom of the mounting seat 12. When the detection device needs to be pulled out, the air guide seat 11 is first moved upward so that the first limiting ball block 112 retreats into the spherical groove 123, and the second limiting ball block 113 retracts into the second communicating groove 124. The annular side wall formed between the second communicating groove 124 and the annular groove 125 is deformed, blocking the air outlet on the second limiting ball block 113 to form a seal, thereby preventing the gas collected in the spherical airbag 2 from overflowing.

[0030] Furthermore, a slide groove 121 is provided in the mounting seat 12, which is connected to the first connecting groove 122 and located above it. A threaded column 115 is fixedly connected to the top of the connecting rod 114, and the threaded column 115 is threadedly connected to the slide groove 121. The part of the mounting seat 12 with the thread is made of hard clinker material, and the entire air guide seat 11 is made of hard plastic material. The thread in the mounting seat 12 can be opened on the inner side of the plastic ring, and the plastic ring is embedded in the slide groove 121. By rotating the air guide seat 11, the air guide seat 11 moves downward or upward relative to the mounting seat 12, thereby realizing the position switching of the air guide seat 11.

[0031] Furthermore, the mounting seat 12 is inserted into the battery cell liquid injection port 3, and the top extension portion of the mounting seat 12 is located outside the battery cell liquid injection port 3, and is sealed and connected using AB glue.

[0032] Furthermore, the air outlet at the top of the threaded column 115 and the air inlet of the spherical airbag 2 are sealed and connected using AB glue.

[0033] Method for detecting gas production during battery cell formation:

[0034] 1. After assembling the socket head 1, the spherical airbag 2 and the battery cell injection port 3 opened on the battery cell 4, when the fresh battery cell 4 begins to be pre-charged, the spherical airbag 2 will swell and deform accordingly;

[0035] 2. After the formation process is completed, the spherical airbag 2 has reached a stable state. Use a cotton thread to gently wrap around the centerline groove 21 on the spherical airbag 2 and record the length of the cotton thread wrapped around the spherical airbag 2. This length is the diameter of the spherical airbag 2. Finally, the volume of the spherical airbag 2 is calculated based on the diameter. This volume is equivalent to the gas production during formation.

[0036] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A device for detecting gas production during battery cell formation, comprising: A socket head (1), characterized in that: the socket head (1) includes an air guide seat (11) and a mounting seat (12), the air guide seat (11) extends into the mounting seat (12), an air inlet channel (111) with a T-shaped cross section is provided in the air guide seat (11), the air guide seat (11) includes a threaded column (115), the bottom of the threaded column (115) is fixedly connected to a connecting rod (114), a first connecting groove (122) is provided in the mounting seat (12), a spherical groove (123) is provided in the middle of the first connecting groove (122), and a first limiting ball block (112) that just accommodates the spherical groove (123) is fixedly sleeved on the outer side of the connecting rod (114), When the air inlet of the air inlet channel (111) is located in the mounting seat (12), the first limiting ball block (112) is located in the spherical groove (123); when the air inlet of the air inlet channel (111) extends out of the mounting seat (12), the first limiting ball block (112) moves downward and squeezes into the first connecting groove (122).

2. The device for detecting gas production during battery formation according to claim 1, wherein: A second communicating groove (124) is provided in the mounting seat (12), the second communicating groove (124) being located below the first communicating groove (122) and being interconnected, a second limiting ball block (113) being fixedly connected to the bottom of the connecting rod (114), and an air inlet of the air inlet channel (111) being located on the second limiting ball block (113).

3. The device for detecting gas production during battery formation according to claim 2, wherein: An annular groove (125) coaxial with the second communicating groove (124) is provided on the bottom of the mounting seat (12).

4. The device for detecting gas production during battery formation according to claim 3, wherein: A slide groove (121) is provided in the mounting seat (12) and is connected to the first connecting groove (122) and is located above the first connecting groove (122). A threaded column (115) is fixedly connected to the top of the connecting rod (114). The threaded column (115) is threadedly connected to the slide groove (121).

5. The device for detecting gas production during battery formation according to claim 1, wherein: The mounting seat (12) is inserted into the battery cell liquid injection port (3), and the top extension portion of the mounting seat (12) is located outside the battery cell liquid injection port (3) and is sealed and connected using AB glue.

6. The device for detecting gas production during battery formation according to claim 4, characterized in that: The air outlet at the top of the threaded column (115) and the air inlet of the spherical airbag (2) are sealed and connected using AB glue.

7. The device for detecting gas production during battery formation according to claim 4, characterized in that: The threaded portion of the mounting seat (12) is made of hard clinker material.

8. The device for detecting gas production during battery formation according to claim 1, characterized in that: The entire air guide seat (11) is made of hard plastic.

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