An airbag

Abstract

This invention relates to the field of battery technology and discloses an air bag, comprising: a sealing bag and a plurality of first spacers. The sealing bag includes a first bag area and a second bag area, which are arranged at intervals along a first direction. The first bag area has a first receiving cavity, and the second bag area has a second receiving cavity. The first receiving cavity and the second receiving cavity are connected, and the first receiving cavity is used to receive a battery cell. The plurality of first spacers are arranged at intervals along the first direction in the second receiving cavity, and the first spacers have first connecting holes that connect two adjacent first gas storage cavities. This application, on the one hand, allows for the individual cutting of the gas-filled bag from the air bag for testing, improving the convenience of testing; on the other hand, the first connecting hole of this application can be pre-set to a size that allows gas to pass through, and after the gas is collected, the first connecting hole is heat-sealed, effectively reducing the possibility of air leakage from the air bag.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an air bag. Background Technology

[0002] In the development of battery cells, the study of gas generation behavior is crucial. High-nickel / ultra-high-nickel cathodes, silicon-carbon / silicon-oxygen anodes, and various functional electrolytes are widely used in high-energy-density cells. Therefore, a simple and effective way to study the gas generation behavior of new chemical systems is one of the keys to accelerating the development of high-energy-density cells.

[0003] In studies of gas production behavior, the battery cell is typically placed in a gas bag. The gas produced by the cell is retained in the gas bag. The gas is then released by cutting off one corner of the gas bag, and the opening is then heat-sealed so that the gas bag can collect gas again. However, this method is inconvenient because it only allows direct connection of the gas bag to the testing device. Furthermore, the heat-sealing effect of the cut opening is poor, resulting in air leakage. In addition, directly connecting the gas bag to the testing device also has another drawback: repeated disassembly and reassembly of the battery cell testing device are required. This is especially true for battery cells with stress clamps, as it is difficult to restore the original stress state of the battery cell after reassembly. Summary of the Invention

[0004] The technical problem this invention aims to solve is as follows: In studies of gas generation behavior, the battery cell is typically placed in a gas bag, where the gas generated by the battery cell remains. The gas is then discharged by cutting off one corner of the gas bag and then heat-sealed to allow the gas bag to collect gas again. However, this method not only requires the gas bag to be directly connected to the detection device, making detection very inconvenient, but also results in poor heat-sealing of the cut opening, leading to gas leakage.

[0005] To address the aforementioned technical problems, the present invention provides a gas bag for collecting gas generated by a battery cell during the reaction process. The gas bag has intersecting first and second directions and includes:

[0006] The packaging bag includes a first bag area and a second bag area, which are arranged at a distance along the first direction; the first bag area has a first receiving cavity, the second bag area has a second receiving cavity, the first receiving cavity is connected to the second receiving cavity, and the first receiving cavity is used to receive the battery cell.

[0007] Multiple first partitions are spaced apart in the second receiving cavity along the first direction to divide the second receiving cavity into multiple first gas storage cavities spaced apart along the first direction; a first connecting hole is provided on the first partition, and the first connecting hole connects two adjacent first gas storage cavities.

[0008] The first connecting hole can be closed to isolate two adjacent first gas storage chambers and configure the first gas storage chamber away from the first receiving chamber as a sealed chamber for storing gas.

[0009] Optionally, it further includes: a plurality of second partitions; the plurality of second partitions are spaced apart along the second direction in the second receiving cavity to divide the first gas storage cavity into a plurality of gas storage chambers; the second partitions are provided with second connecting holes; the second connecting holes connect two adjacent gas storage chambers in the second direction.

[0010] Optionally, the first connecting hole includes: a plurality of first sub-through holes; the first sub-through holes connect two adjacent gas storage chambers in the first direction.

[0011] Optionally, the second connecting hole includes: a plurality of second sub-through holes; the second sub-through holes connect two adjacent gas storage chambers in the second direction.

[0012] Optionally, the first spacer is a heat-sealing body; and / or, the second spacer is a heat-sealing body.

[0013] Optionally, the area of ​​the gas storage chamber is S cm. -2 The condition is satisfied that S≥10.

[0014] Optionally, the first spacer extends along the second direction; and / or, the second spacer extends along the first direction.

[0015] Optionally, the thickness of the second spacer is d1; the distance between the opposite sides of two adjacent second spacers in the second direction is W1; and the width of the first sub-through hole in the second direction is P1.

[0016] Among them, W1-2d1≥P1 is satisfied.

[0017] A gas bag for collecting gas generated by a battery cell during a reaction process, the gas bag having intersecting first and second directions, comprising:

[0018] The packaging bag includes a first bag area and a second bag area, which are arranged at a distance along the first direction; the first bag area has a first receiving cavity, the second bag area has a second receiving cavity, the first receiving cavity is connected to the second receiving cavity, and the first receiving cavity is used to receive the battery cell.

[0019] A barrier strip and a plurality of second partition strips are arranged at intervals along the second direction in the second receiving cavity. The barrier strip is arranged at one end of the second partition strip facing the first receiving cavity to divide the second receiving cavity into a plurality of second gas storage cavities arranged at intervals along the second direction. A second connecting hole is provided on the second partition strip, which connects two adjacent second gas storage cavities. A plurality of third connecting holes are provided on the barrier strip, which respectively connect the first receiving cavity and the second gas storage cavity.

[0020] The second and third connecting holes can be closed to isolate two adjacent second gas storage chambers and configure one of the second gas storage chambers as a sealed chamber for storing gas.

[0021] Optionally, the second spacer is a heat-sealed body; and / or, the barrier strip is a heat-sealed body.

[0022] Compared with the prior art, the air bag of this invention has the following advantages:

[0023] In this embodiment of the invention, after the battery cell generates gas during the customized electrochemical testing step, the gas is directed to the first gas storage chamber furthest from the battery cell in a first direction. Then, the first spacer on the side of the first gas storage chamber closest to the battery cell is heat-sealed to close the first connecting hole on the first spacer, thereby forming a sealed chamber in the first gas storage chamber furthest from the battery cell in the first direction. This sealed chamber stores the gas generated during the customized electrochemical testing step. Then, the first spacer is cut along its extension direction to divide it into two parts in the first direction, so that the bag formed by the sealed chamber can be cut into a sealed bag. One part of the cut first spacer serves as the side of the sealed chamber, and the other part serves as the side of the sealed bag. Repeat the above steps until a sufficient number of bags are tested. Based on this, this application allows for the individual cutting of gas-filled bags from the gas bag for testing, improving the convenience of the test. Furthermore, the first connecting hole of this application can be pre-set to a size sufficient for gas passage. After gas collection, the first connecting hole is heat-sealed, effectively reducing the possibility of gas bag leakage. Secondly, using the gas bag of this application, during the testing process, only the cut sealed bag needs to be transferred to the testing device for testing; the gas bag containing the battery cell does not need to be transferred. This also avoids repeated disassembly and reassembly of the battery cell clamp, minimizing interference with the electrochemical performance of the battery cell during gas sampling testing and ensuring the effectiveness of in-situ gas generation behavior research. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an air bag shown in some embodiments of this application;

[0025] Figure 2 This is a schematic diagram of the structure of an air bag shown in some embodiments of this application;

[0026] Figure 3 This is a schematic diagram of the structure of an air bag shown in some other embodiments of this application.

[0027] In the diagram, 1 is the packaging bag; 11 is the first bag area; 111 is the first receiving cavity; 12 is the second bag area; 121 is the second receiving cavity; 2 is the first partition bar; 21 is the first connecting hole; 211 is the first sub-through hole; 3 is the first gas storage cavity; 4 is the second partition bar; 41 is the second connecting hole; 411 is the second sub-through hole; 5 is the barrier bar; 51 is the third connecting hole; 6 is the second gas storage cavity; 7 is the battery cell; 8 is the gas storage chamber; X is the first direction; Y is the second direction. Detailed Implementation

[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0029] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0030] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude the plural.

[0031] Furthermore, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the accompanying drawings, can still be combined among these technical features (or their equivalents) to obtain other embodiments of this application not directly mentioned herein.

[0032] It should also be understood that while the terms "first," "second," etc., are used in this document to describe various types of information, this information should not be limited to these terms, which are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0033] It should be noted that in different figures, the same reference numerals denote the same or substantially the same components.

[0034] like Figure 1 As shown in the preferred embodiment of the present invention, a gas bag is used to collect the gas generated by the battery cell 7 during the reaction process. The collected gas is used for studying the gas generation behavior of the battery cell 7. The gas bag has intersecting first direction X and second direction Y, wherein the gas bag includes: a sealing bag 1 and a plurality of first spacers 2.

[0035] The packaging bag 1 includes a first bag area 11 and a second bag area 12, which are arranged at intervals along a first direction X. The first bag area 11 has a first receiving cavity 111, and the second bag area 12 has a second receiving cavity 121. The first receiving cavity 111 and the second receiving cavity 121 are connected. The first receiving cavity 111 is used to receive the battery cell 7.

[0036] Multiple first partition bars 2 are arranged at intervals along the first direction X in the second receiving cavity 121 to divide the second receiving cavity 121 into multiple first gas storage cavities 3 arranged at intervals along the first direction X. A first connecting hole 21 is provided on the first partition bar 2, and the first connecting hole 21 connects two adjacent first gas storage cavities 3.

[0037] Among them, the first communication hole 21 can be closed to isolate two adjacent first gas storage cavities 3 and configure the first gas storage cavity 3 far from the first accommodation cavity 111 as a sealed cavity for storing gas.

[0038] Based on the above structure, in this application, the battery cell 7 is arranged in the first accommodation cavity 111 of the first bag area 11. After the battery cell 7 generates gas through a customized electrochemical test step, the gas is driven into the first gas storage cavity 3 that is the farthest from the battery cell 7 in the first direction X. Then, the first partition strip 2 on the side of the first gas storage cavity 3 close to the battery cell 7 is heat-sealed so that the first communication hole 21 on the first partition strip 2 is closed, so that the first gas storage cavity 3 that is the farthest from the battery cell 7 in the first direction X forms a sealed cavity, and the sealed cavity stores the gas generated in the customized electrochemical test step. Then, the first partition strip 2 adjacent to the sealed cavity is cut along the extension direction of the first partition strip 2, so that the first partition strip 2 is separated into two parts in the first direction X, so as to cut out a sealed bag from the bag body formed by the above-mentioned sealed cavity. One of the cut parts of the first partition strip 2 serves as the side of the sealed cavity, and the other part serves as the side of the packaging bag 1. Repeat the above steps until a sufficient number of bag bodies are tested. Based on this, on the one hand, this application can separately cut out the bag body filled with gas from the air bag for detection. Compared with the conventional method of connecting the detection device to the air bag to collect gas, this application separately sends the bag body filled with gas for inspection, thereby improving the convenience of detection. On the other hand, the size of the first communication hole 21 in this application can be preset, and the size of the first communication hole 21 only needs to ensure that gas can pass through. After collecting the gas, the first communication hole 21 is heat-sealed, effectively reducing the possibility of air leakage in the air bag. Secondly, when using the air bag of this application in the detection process, only the cut sealed bag needs to be transferred to the detection device for detection, and the air bag containing the battery cell 7 does not need to be transferred. At the same time, it is also possible to avoid repeatedly disassembling and assembling the battery cell fixture, minimizing the interference of gas collection testing on the electrochemical performance of the battery cell 7 and ensuring the effectiveness of in-situ gas generation behavior research.

[0039] Specifically, the air bag has a rectangular frame-shaped heat-sealing strip, and the sealed area enclosed by the frame-shaped heat-sealing strip is the area where the first bag area 11 and the second bag area 12 are located.

[0040] It should be noted that there are various ways to drive the gas into the first gas storage cavity 3 that is the farthest from the battery cell 7 in the first direction X. For example: by manually squeezing, or by pressing the air bag with a pressing block in the direction away from the battery cell to drive the gas to the first gas storage cavity 3 that is the farthest from the battery cell 7.

[0041] Here, it should be noted that the included angle formed by the first direction X and the second direction Y is a, and the value range of a is between 0° < a ≤ 90°. In this embodiment, preferably, the first direction X and the second direction Y are perpendicular to each other.

[0042] In one possible embodiment, see Figure 1 and Figure 2 The embodiments of the present invention further include: a plurality of second partitions 4. The plurality of second partitions 4 are arranged at intervals along the second direction Y in the second receiving cavity 121 to divide the first gas storage cavity 3 into a plurality of gas storage chambers 8. The second partitions 4 are provided with second connecting holes 41, which connect two adjacent gas storage chambers 8 in the second direction Y.

[0043] For example, the first spacer 2 and the second spacer 4 are connected in an alternating manner to create a plurality of gas storage chambers 8 spaced apart in both the first direction X and the second direction Y, each gas storage chamber 8 being capable of being used once. Preferably, the first spacer 2 and the second spacer 4 are connected in an alternating manner in a perpendicular manner, such that in the first direction X, the gas storage chambers 8 are connected through the first connecting hole 21, and in the second direction Y, the gas storage chambers 8 are connected through the second connecting hole 41.

[0044] Further, see Figure 1 and Figure 2 The first connecting hole 21 includes: a plurality of first sub-through holes 211, the first sub-through holes 211 connecting two adjacent gas storage chambers 8 in the first direction X, and the plurality of first sub-through holes 211 being spaced apart on the first spacer 2 along the second direction Y.

[0045] Further, see Figure 1 and Figure 2 The second connecting hole 41 includes a plurality of second sub-through holes 411. The second sub-through holes 411 connect two adjacent gas storage chambers 8 in the second direction Y, and the plurality of second sub-through holes 411 are spaced apart on the second spacer 4 along the first direction X.

[0046] In this embodiment, when it is necessary to collect the gas generated by the battery cell 7 during the reaction process, the gas is directed to the row of gas storage chambers 8 furthest from the battery cell 7 in the first direction X (this row of gas storage chambers 8 is arranged at intervals along the second direction Y). Then, the first spacer 2 furthest from the battery cell 7 is heat-sealed to connect the multiple gas storage chambers 8 furthest from the battery cell 7 in the first direction X and form a sealed cavity. Finally, the gas is directed to one of the multiple gas storage chambers 8, and the second spacer 4 adjacent to that gas storage chamber 8 is heat-sealed to close the first sub-through hole 211 on the first spacer 2 and the second sub-through hole 411 on the second spacer 4, so that the gas storage chamber 8 forms a sealed cavity. By cutting the first spacer 2 and the second spacer 4 around the sealed cavity, a sealed bag is cut out from the bag formed by the sealed cavity. The above steps are repeated until a sufficient number of bags are tested.

[0047] In one possible embodiment, the first spacer 2 is a heat-sealing body. And / or, the second spacer 4 is a heat-sealing body. The heat-sealing body is made of a material with good heat-sealing properties, and can be heat-sealed by a heat-sealing machine to close the first sub-through hole 211 and the second sub-through hole 411 on the first spacer 2 or the second spacer 4.

[0048] Specifically, the first spacer 2 and the second spacer 4 may include at least one of the following film layers: low-density polyethylene (LDPE) film layer, LLDPE film layer, ethylene-vinyl acetate copolymer (EVA) film layer, high-density polyethylene (HDPE) film layer, or PP film layer.

[0049] To meet the gas intake requirements, the area of ​​gas storage chamber 8 is S cm². -2 The following condition must be met: S≥10, so that the gas storage chamber 8 can store enough gas for detection.

[0050] In one possible embodiment, see Figure 2 The thickness of the second spacer 4 is d1. In the second direction Y, the distance between the opposite sides of two adjacent second spacers 4 is W1. The width of the first sub-through hole 211 in the second direction Y is P1.

[0051] Wherein, W1-2d1≥P1 is satisfied, so that the width of the first sub-through hole 211 in the second direction Y is less than the distance between the opposite sides of two adjacent second spacers 4, so that the first sub-through hole 211 has enough space for gas to enter into the gas storage chamber 8.

[0052] See Figure 3 The present invention also provides an air bag according to another embodiment, the air bag being used to collect the gas generated by the battery cell 7 during the reaction process, the air bag having an intersecting first direction X and a second direction Y, the air bag comprising: a sealing bag 1, a barrier strip 5 and a plurality of second spacers 4.

[0053] The packaging bag 1 includes a first bag area 11 and a second bag area 12. The first bag area 11 and the second bag area 12 are arranged at intervals along a first direction X. The first bag area 11 has a first receiving cavity 111, and the second bag area 12 has a second receiving cavity 121. The first receiving cavity 111 and the second receiving cavity 121 are connected. The first receiving cavity 111 is used to receive the battery cell 7.

[0054] Multiple second partition bars 4 are arranged at intervals along the second direction Y in the second receiving cavity 121. A barrier bar 5 is arranged at one end of the second partition bar 4 facing the first receiving cavity 111 to divide the second receiving cavity 121 into multiple second gas storage cavities 6 arranged at intervals along the second direction Y. The second partition bar 4 is provided with a second connecting hole 41, which connects two adjacent second gas storage cavities 6. The barrier bar 5 is provided with multiple third connecting holes 51, which respectively connect the first receiving cavity 111 and the second gas storage cavity 6.

[0055] The second connecting hole 41 and the third connecting hole 51 can be closed to isolate two adjacent second gas storage chambers 6 and configure one of the second gas storage chambers 6 as a sealed chamber for storing gas.

[0056] Based on the above structure, this application will place the battery cell 7 in the first receiving cavity 111 of the first bag area 11. After the battery cell 7 generates gas through the customized electrochemical test step, the gas is driven into any second gas storage cavity 6 in the second direction Y. Then, the barrier strip 5 and the second spacer 4 around the second gas storage cavity 6 containing the gas are heat-sealed to close the third connecting hole 51 on the barrier strip 5 and the second connecting hole 41 on the second spacer 4. Then, the second spacer 4 is cut along the extension direction of the second spacer 4 and the barrier strip 5 is cut along the extension direction of the barrier strip 5 so that the second spacer 4 is divided into two parts in the second direction Y and the barrier strip 5 is divided into two parts in the first direction X. The bag body formed by the above-formed sealed cavity is cut into a sealed bag. One part of the cut second spacer 4 serves as the side of the sealed cavity, and the other part serves as the side of the encapsulated bag 1. Repeat the above steps until a sufficient number of bags are tested. Based on this, this application allows for the separate cutting of gas-filled bags from the gas bag for testing. Compared to the previous method of requiring a testing device to be connected to the gas bag for gas collection, this application improves the convenience of testing by sending the gas-filled bags for testing separately. Furthermore, the second and third connecting holes 41 and 51 of this application can be pre-sized to ensure gas passage. After gas collection, the second and third connecting holes 41 and 51 are heat-sealed, effectively reducing the possibility of gas bag leakage. Secondly, using the gas bag of this application, during the testing process, only the cut sealed bag needs to be transferred to the testing device for testing; the gas bag containing the battery cell 7 does not need to be transferred. This also avoids repeated disassembly and assembly of the battery cell clamp, minimizing interference with the electrochemical performance of the battery cell 7 during gas sampling testing and ensuring the effectiveness of in-situ gas generation behavior research.

[0057] In one possible embodiment, the second spacer 4 is a heat-sealing body, and / or the barrier strip 5 is a heat-sealing body. The heat-sealing body is made of a material with good heat-sealing properties, and can be heat-sealed by a heat-sealing machine to close the third through hole and the second connecting hole 41 on the barrier strip 5 or the second spacer 4.

[0058] Specifically, the barrier strip 5 and the second spacer 4 may include at least one of the following film layers: low-density polyethylene (LDPE) film layer, LLDPE film layer, ethylene-vinyl acetate copolymer (EVA) film layer, high-density polyethylene (HDPE) film layer, or PP film layer.

[0059] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A gas bag for collecting gas generated by a battery cell during a reaction process, the gas bag having intersecting first direction and (X) second direction (Y), characterized in that, include: A packaging bag (1) includes a first bag area (11) and a second bag area (12), the first bag area (11) and the second bag area (12) being arranged at intervals along the first direction (X); the first bag area (11) has a first receiving cavity (111), the second bag area (12) has a second receiving cavity (121), the first receiving cavity (111) and the second receiving cavity (121) are connected, and the first receiving cavity (111) is used to receive the battery cell (7); Multiple first partitions (2) are arranged at intervals along the first direction (X) in the second receiving cavity (121) to divide the second receiving cavity (121) into multiple first gas storage cavities (3) arranged at intervals along the first direction (X); a first connecting hole (21) is provided on the first partition (2) and the first connecting hole (21) connects two adjacent first gas storage cavities (3); The first connecting hole (21) can be closed to isolate two adjacent first gas storage chambers (3) and configure the first gas storage chamber (3) away from the first receiving chamber (111) as a sealed chamber for storing gas.

2. The air bag according to claim 1, characterized in that, Also includes: Multiple second partitions (4); multiple second partitions (4) are spaced apart along the second direction (Y) in the second receiving cavity (121) to divide the first gas storage cavity (3) into multiple gas storage chambers (8); a second connecting hole (41) is provided on the second partition (4); the second connecting hole (41) connects two adjacent gas storage chambers (8) in the second direction (Y).

3. The air bag according to claim 2, characterized in that, The first connecting hole (21) includes: a plurality of first sub-connecting holes (211); the first sub-connecting holes (211) connect two adjacent gas storage chambers (8) in the first direction (X).

4. The air bag according to claim 2 or 3, characterized in that, The second connecting hole (41) includes: a plurality of second sub-connecting holes (411); the second sub-connecting holes (411) connect two adjacent gas storage chambers (8) in the second direction (Y).

5. The air bag according to claim 2, characterized in that, The first spacer (2) is a heat seal; and / or, the second spacer (4) is a heat seal.

6. The air bag according to claim 3, characterized in that, The area of ​​the gas storage chamber (8) is S cm. -2 The condition is satisfied that S≥10.

7. The air bag according to claim 2, characterized in that, The first spacer (2) extends along the second direction (Y); and / or, the second spacer (4) extends along the first direction (X).

8. The air bag according to claim 3, characterized in that, The thickness of the second spacer (4) is d1; the distance between the opposite sides of two adjacent second spacers (4) in the second direction (Y) is W1; the width of the first sub-through hole (211) in the second direction (Y) is P1; Among them, W1-2d1≥P1 is satisfied.

9. A gas bag for collecting gas generated by a battery cell during a reaction process, the gas bag having intersecting first direction (X) and second direction (Y), characterized in that, include: A packaging bag (1) includes a first bag area (11) and a second bag area (12), the first bag area (11) and the second bag area (12) being arranged at intervals along the first direction (X); the first bag area (11) has a first receiving cavity (111), the second bag area (12) has a second receiving cavity (121), the first receiving cavity (111) and the second receiving cavity (121) are connected, and the first receiving cavity (111) is used to receive the battery cell (7); A barrier strip (5) and a plurality of second partition strips (4) are arranged at intervals along the second direction (Y) in the second receiving cavity (121). The barrier strip (5) is arranged at one end of the second partition strip (4) facing the first receiving cavity (111) to divide the second receiving cavity (121) into a plurality of second gas storage cavities (6) arranged at intervals along the second direction (Y). A second connecting hole (41) is provided on the second partition strip (4), and the second connecting hole (41) connects two adjacent second gas storage cavities (6). A plurality of third connecting holes (51) are provided on the barrier strip (5), and the plurality of third connecting holes (51) respectively connect the first receiving cavity (111) and the second gas storage cavity (6). The second connecting hole (41) and the third connecting hole (51) can be closed to isolate two adjacent second gas storage chambers (6) and configure one of the second gas storage chambers (6) as a sealed chamber for storing gas.

10. The air bag according to claim 9, characterized in that, The second spacer (4) is a heat-sealing body; and / or, the barrier (5) is a heat-sealing body.

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