Exhaust mechanism and lithium ion battery thereof

Abstract

The utility model discloses an exhaust mechanism and a lithium ion battery thereof. The exhaust mechanism comprises a formation nail, an air guide pipe, a control valve and an air storage bag, a channel for placing an air guide pipe is formed in the formation nail; one end of the gas-guide tube is communicated with the interior of the lithium battery, and the other end is connected to the gas storage bag; the control valve is arranged in the air guide pipe and used for controlling opening and closing of the air guide pipe. According to the formation nail, the channel for placing the gas guide pipe is arranged in the formation nail, and the tail end of the gas guide pipe is connected to the gas storage bag, so that when the battery is subjected to formation and high-temperature aging, the control valve is arranged in the gas guide pipe to discharge gas in the lithium battery into the gas storage bag; in addition, by arranging the first gas guide section and the second gas guide section perpendicular to the first gas guide section, the flowing path of the gas and the electrolyte can be prolonged, and the electrolyte is prevented from being discharged along with the gas.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery formation exhaust equipment technical field, concretely relates to a kind of exhaust mechanism and lithium electronic battery thereof. BACKGROUND

[0002] The production process of lithium battery is very complex, including multiple processes. Among them, formation is a very important link, and lithium battery formation is the first charging process after lithium battery injection, which is crucial to the performance of lithium battery. During the formation process, the injection hole of the battery is usually blocked to prevent internal contamination.

[0003] The current formation nail is generally columnar, and the columnar formation nail is inserted into the injection hole. The upper part of the formation nail has a diameter larger than the hole diameter of the injection hole, and the whole serves as a seal. However, during the formation process, gas is generated when the lithium battery negative electrode forms a solid electrolyte interface film. The internal pressure of the lithium battery increases after gas production, which can easily cause the lithium battery to swell and deform. At the same time, gas trapped between the lithium battery electrode plates can cause interface black spots, affecting the performance of the lithium battery. In addition, during the aging process after formation, gas is generated due to side reactions of the electrolyte. When the internal pressure of the battery increases, there is a risk of lifting the formation nail, which can reduce the sealing performance of the battery and increase the risk of contact between the battery interior and moisture in the air, thereby increasing the number of side reactions during high-temperature aging of the battery and affecting the quality of the lithium battery.

[0004] Therefore, a new solution is needed to solve the above problems. SUMMARY

[0005] The utility model provides a kind of exhaust mechanism and lithium electronic battery, can solve the problem that existing aging process, electrolyte side reaction will produce gas, finally affect lithium battery quality.

[0006] The utility model provides an exhaust mechanism, including formation nail, gas guide pipe, control valve and gas storage bag;

[0007] The formation nail has a channel inside for placing the gas guide pipe;

[0008] One end of the gas guide pipe is in communication with the interior of the lithium battery, and the other end is connected to the gas storage bag;

[0009] The control valve is arranged in the gas guide pipe to control the opening and closing of the gas guide pipe.

[0010] Further, the formation nail includes a first body segment and a second body segment, the second body segment is inserted into the electrolyte of the lithium battery, and the diameter of the first body segment is larger than that of the second body segment.

[0011] Further, a side of the first body segment away from the second body segment is provided with a protruding portion, a diameter of the protruding portion is greater than a diameter of the first body segment.

[0012] Further, the gas guide pipe comprises a first gas guide segment in communication with the interior of the lithium battery and a second gas guide segment arranged perpendicularly to the first gas guide segment, and an end of the second gas guide segment is provided with the gas storage bag.

[0013] Further, the control valve is arranged in the second gas guide segment.

[0014] Further, an end of the first body segment towards the lithium battery is provided with a necking portion, and the necking portion is in the shape of a frustum.

[0015] Further, the first body segment, the second body segment and the protruding portion are manufactured in an integrated manner.

[0016] Further, the material of the formation nail is rubber.

[0017] The utility model also provides a lithium ion battery which comprises the exhaust mechanism.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] 1. The utility model discloses a channel for placing a gas guide pipe in the formation nail, and the gas guide pipe is connected to a gas storage bag at the end, so that when the battery is formed and high-temperature aged, the gas in the lithium battery can be discharged to the gas storage bag through the control valve arranged in the gas guide pipe, thereby avoiding the gas generated during formation and high-temperature aging from causing interface black spots and deformation of the battery shell, and ultimately affecting the quality of the lithium battery.

[0020] 2. The utility model discloses a first gas guide segment and a second gas guide segment arranged perpendicularly thereto, which can prolong the flow path of the gas and the electrolyte and avoid the electrolyte from being discharged together with the gas. BRIEF DESCRIPTION OF DRAWINGS

[0021] Fig. 1 It is a structural schematic view of the utility model discloses an exhaust mechanism and lithium battery combination.

[0022] Fig. 2 It is a sectional view of the utility model discloses an exhaust mechanism.

[0023] Mark: 1, formation nail;11, channel;12, first body segment;121, necking portion;13, second body segment;14, protruding portion;2, gas guide pipe;21, first gas guide segment;22, second gas guide segment;3, control valve;4, gas storage bag;5, lithium battery. DETAILED DESCRIPTION

[0024] In order to further understand the utility model content, characteristics and effects of the utility model, the following examples are given, and the accompanying drawings are combined Figs. 1-2 The specific description is as follows.

[0025] As Figs. 1-2 shown, the embodiment provides an exhaust mechanism arranged in the liquid injection hole at the top end of the lithium battery 5, comprising a formation nail 1, a gas guide pipe 2, a control valve 3 and a gas storage bag 4.

[0026] The formation nail 1 is internally provided with a channel 11 for placing the gas guide pipe 2.

[0027] One end of the gas guide pipe 2 is in communication with the inside of the lithium battery 5, and the other end is connected to the gas storage bag 4.

[0028] The control valve 3 is arranged in the gas guide pipe 2 and is used for controlling the opening and closing of the gas guide pipe 2.

[0029] The utility model discloses a channel for placing the gas guide pipe is arranged in the formation nail, and the gas guide pipe is connected to the gas storage bag at the tail end, when the battery is formed and high-temperature aged, the gas in the lithium battery is discharged to the gas storage bag by arranging the control valve in the gas guide pipe, so that the gas generated during the formation and high-temperature aging can be avoided to cause the interface black spot and the battery shell to swell and deform, finally affect the quality of the lithium battery. In addition, the gas generated during the formation and aging of the battery can be collected by the gas storage bag, which can be used for nondestructive gas component identification, which has important guiding significance for understanding the formation and aging process of the battery.

[0030] In the embodiment, as Fig. 1 shown, the formation nail 1 comprises a first body section 12 and a second body section 13, the second body section 13 is inserted into the electrolyte of the lithium battery 5, and the diameter of the first body section 12 is greater than that of the second body section 13.

[0031] In the embodiment, as Fig. 1 shown, the side of the first body section 12 away from the second body section 13 is provided with a protruding part 14, and the diameter of the protruding part 14 is greater than that of the first body section 12, so that the formation nail 1 can be conveniently pulled out.

[0032] In the embodiment, as Fig. 2 shown, the gas guide pipe 2 comprises a first gas guide section 21 in communication with the inside of the lithium battery 5 and a second gas guide section 22 arranged perpendicularly to the first gas guide section 21, the end of the second gas guide section 22 is provided with the gas storage bag 4, and the control valve 3 is arranged in the second gas guide section 22. The utility model can prolong the flow path of the gas and the electrolyte by arranging the first gas guide section and the second gas guide section perpendicular thereto, and avoid the electrolyte from being discharged together with the gas.

[0033] In the embodiment, as Fig. 1As shown, the first body segment 12 is provided with a tapered portion 121 at one end of the lithium battery 5, the tapered portion 121 is in the shape of a frustum, by setting the first body segment 12 to reduce the gas flow diameter, prevent the electrolyte from flowing out with the gas, and increase the liquid retention amount.

[0034] In the embodiment, the first body segment 12, the second body segment 13 and the protruding portion 14 are manufactured in an integrated manner, and the material of the formation nail 1 is rubber, which has a certain elasticity, facilitating pulling out and inserting.

[0035] The utility model discloses a first body segment 12 of formation nail 1 is inserted into the liquid injection hole of lithium battery 5 before formation, opens control valve 3 and communicates gas guide pipe 2, then communicates the charging equipment and carries out formation to lithium battery 5, in the formation process, the negative pole of lithium battery 5 generates gas when forming solid electrolyte interface film, and the gas flows to the gas storage bag 4 along the first gas guide segment 21 and the second gas guide segment 22, after charging, control valve 3 is closed first, and the gas storage bag 4 is removed, then formation nail 1 is pulled out, and the liquid injection hole is blocked, and formation is completed.

[0036] The first body segment 12 of formation nail 1 is inserted into the liquid injection hole before aging, control valve 3 is opened to communicate gas guide pipe 2, then lithium battery 5 is placed into the high-temperature aging room, in the aging process, the gas generated in lithium battery 5 is discharged to the gas storage bag 4 through the gas guide pipe, control valve 3 is closed first after aging, the gas storage bag 4 is removed, formation nail 1 is pulled out, the liquid injection hole is blocked, and aging is completed. If the gas production is large during the process, control valve 3 can be closed to replace the new gas storage bag 4.

[0037] After formation and aging are completed, the gas collected by the gas storage bag 4 is analyzed. A gas chromatograph is used to qualitatively and quantitatively analyze the gas generated during formation and aging, which has important guiding significance for understanding the formation and aging process of the battery.

[0038] The utility model discloses still provide a kind of lithium ion battery, including the exhaust mechanism as above.

[0039] The above-mentioned utility model of the present application only expresses the implementation mode of the embodiment of the utility model, and cannot therefore be understood as the limitation of the utility model patent range, and is not any form of the structure of the embodiment of the utility model. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the embodiment of the utility model, a number of changes and improvements can be made, which belong to the protection scope of the embodiment of the utility model.

Claims

1. An exhaust mechanism characterized by: The device comprises a formation nail (1), an air guide pipe (2), a control valve (3) and an air storage bag (4); The formation nail (1) is internally provided with a channel (11) for placing the air guide pipe (2); One end of the air guide pipe (2) is in communication with the inside of the lithium battery (5), and the other end is connected to the air storage bag (4); The control valve (3) is arranged in the air guide pipe (2) and is used for controlling the opening and closing of the air guide pipe (2).

2. A venting mechanism according to claim 1, wherein: The formation nail (1) comprises a first body section (12) and a second body section (13), the second body section (13) is inserted into the electrolyte of the lithium battery (5), and the diameter of the first body section (12) is greater than that of the second body section (13).

3. A venting mechanism according to claim 2, wherein: A protruding part (14) is arranged on the side of the first body section (12) away from the second body section (13), and the diameter of the protruding part (14) is greater than that of the first body section (12).

4. A venting mechanism according to claim 1, wherein: The air guide pipe (2) comprises a first air guide section (21) in communication with the inside of the lithium battery (5) and a second air guide section (22) arranged perpendicularly to the first air guide section (21), and the end of the second air guide section (22) is provided with the air storage bag (4).

5. A venting mechanism according to claim 4, wherein: The control valve (3) is arranged in the second air guide section (22).

6. A venting mechanism according to claim 2, wherein: One end of the first body section (12) towards the lithium battery (5) is provided with a necked part (121), and the shape of the necked part (121) is a frustum.

7. A venting mechanism according to claim 3, wherein: The first body section (12), the second body section (13) and the protruding part (14) are manufactured in an integrated manner.

8. A venting mechanism according to claim 7, wherein: The material of the formation nail (1) is rubber.

9. A lithium-ion battery, characterized by: The device comprises an exhaust mechanism as claimed in any one of claims 1-8. The device comprises an exhaust mechanism as claimed in any one of claims 1-8.

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