Pouch-type secondary battery

Abstract

This invention proposes a pouch-type secondary battery, comprising: a battery cell, a baffle, and a floating component. The battery cell is externally covered with an elastic packaging film. The two sides of the baffle are fixedly connected to the front end of the battery cell via mounting plates, leaving space between the baffle and the battery cell for gas passage. An exhaust port is provided on the baffle, penetrating the packaging film. The floating component is rotatably connected to the mounting plate via a rotating shaft. The floating component includes a floating plate and a first lever connected perpendicularly to each other. The rotating shaft passes through and is fixed at the junction of the floating plate and the first lever. The floating plate is positioned between the upper end face of the battery cell and the packaging film and is adhered to the packaging film. The first lever is located between the battery cell and the baffle, with space between the first lever and the front end face of the battery cell for the first lever to swing. A sealing plug is fixedly connected to the side of the first lever facing the exhaust port, and under normal conditions, the sealing plug seals the exhaust port. This invention allows gas inside the packaging film to escape quickly, reducing the risk of battery explosion.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a pouch-type secondary battery. Background Technology

[0002] In related technologies, during the use of pouch batteries, irreversible side reactions occur inside the battery, generating gas. This causes the casing to expand macroscopically due to gas accumulation. Under overcharge conditions, the positive electrode material undergoes excessive delithiation and exhibits a high oxidation state, which triggers the oxidation reaction of solvent molecules in the electrolyte, generating small molecule gases such as CO and CO2. Simultaneously, the solid electrolyte interface film on the negative electrode surface is prone to rupture during cycling. The exposed fresh lithium metal undergoes a reduction reaction with the electrolyte, generating hydrocarbon gases such as methane and ethane. Furthermore, the increased local polarization caused by high-rate charging and discharging or the rise in ambient temperature accelerates the above reaction kinetics, promoting rapid gas accumulation. When the amount of gas generated exceeds the elastic capacity limit of the pouch casing, the battery bulges. This process is often accompanied by battery capacity decay and electrochemical performance degradation.

[0003] In existing technologies, the volume expansion caused by the bulging of pouch batteries can compress the internal structure of the device, leading to deformation of the device casing, screen cracking, and even compression of other components, causing functional damage to the device and loss of normal usability. Summary of the Invention

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention provide a pouch-type secondary battery that allows for the rapid expulsion of gas from inside the packaging film.

[0005] This invention provides a pouch-type secondary battery, comprising: a battery cell, a baffle, and a floating component. The battery cell is covered with an elastic packaging film. The two sides of the baffle are fixedly connected to the front end of the battery cell via mounting plates. A space for gas passage is left between the baffle and the battery cell. The baffle is located inside the packaging film and has an exhaust port that penetrates the packaging film. The floating component is rotatably connected to the mounting plate via a rotating shaft. The floating component includes a floating plate and a first lever connected perpendicularly to each other. The rotating shaft passes through and is fixed at the junction of the floating plate and the first lever. The floating plate is located between the upper end face of the battery cell and the packaging film and is adhered to the packaging film. The first lever is located between the battery cell and the baffle. A space for the first lever to swing is left between the first lever and the front end face of the battery cell. A sealing plug is fixedly connected to the side of the first lever facing the exhaust port. Under normal conditions, the sealing plug seals the exhaust port.

[0006] In some embodiments, the floating plate is strip-shaped, and the two sides of the ends of the floating plate are connected to the wing plates by elastic strips. The wing plates are symmetrically arranged on both sides of the floating plate and are bonded to the packaging film.

[0007] In some embodiments, a first tape is fixedly connected to the front of the floating plate, and a second tape is fixedly connected to the wing plate. The first tape and the second tape are respectively bonded to the packaging film.

[0008] In some embodiments, a limiting film is fixedly connected to the inner side of the packaging film. The limiting film is located at the upper end of the battery cell. The front and rear ends of the limiting film have through openings. An interlayer is formed between the limiting film and the packaging film. The floating plate and the wing plate are inserted into the interlayer through the openings and extend out of the limiting film. The first tape and the second tape are located outside the limiting film.

[0009] In some embodiments, a fixing rod is fixedly connected between two mounting plates, and a first spring plate is fixedly connected to the fixing rod. The first spring plate is located between the first lever and the battery cell, and the end of the first spring plate abuts against the first lever to provide a restoring force to the first lever.

[0010] In some embodiments, the first spring sheet has a bent insert, and the fixing rod has two slots. The inserts of the two first spring sheets are respectively inserted into the two slots and locked by a locking member.

[0011] In some embodiments, an exhaust box is fixedly connected to the inner side of the baffle at the exhaust port, the interior of the exhaust box forms an exhaust cavity, the exhaust cavity communicates with the exhaust port, and an exhaust hole is opened on the side wall of the exhaust box facing the battery cell, and a sealing plug is normally used to seal the exhaust hole.

[0012] In some embodiments, there are two exhaust ports located on the upper and lower sides of the exhaust box, two floating components and two rotating shafts, two floating plates symmetrically arranged on the upper and lower end faces of the battery cell, two first levers respectively located on the upper and lower sides of the front end of the battery cell, the sealing plugs of the two first levers respectively sealing the two exhaust ports, the two rotating shafts respectively fixedly connected to the two floating components, and two first spring plates fixedly connected to the fixed rod, the two first spring plates respectively connected to the upper and lower sides of the fixed rod and respectively abutting against the two first levers.

[0013] In some embodiments, the rotating shaft is fixedly connected to the floating component, and the two ends of the rotating shaft are rotatably connected to two mounting plates respectively. The two sides of the baffle are symmetrically fixedly connected to the second spring plates, and the two second spring plates are respectively attached to the two sides of the battery cell. The outward side of the second spring plate is fixedly connected to the second lever, which has an arc-shaped cylindrical structure. Under normal conditions, the two second levers are attached to the inner side of the packaging film. The two ends of the rotating shaft extend outward from the mounting plate respectively. The end of the rotating shaft is connected to the movable sleeve through a thread. The end of the rotating shaft is provided with an external thread, and the movable sleeve is provided with an internal thread. The movable sleeve has an external hexagonal structure. A sleeve is fixedly connected to the outside of the mounting plate. The sleeve has an internal hexagonal structure. The movable sleeve is inserted into the sleeve in the horizontal direction and the top of the movable sleeve extends out of the sleeve. The sleeve and the movable sleeve are in sliding fit. The top of the movable sleeve abuts against the second spring plate.

[0014] In some embodiments, a push rod is fixedly connected to the bottom of the outward end of the movable sleeve, and the push rod and the movable sleeve together abut against the second spring plate. Attached Figure Description

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings. in: Figure 1 This is a schematic diagram of the structure of the pouch-type secondary battery in an embodiment of the present invention; Figure 2 for Figure 1 An enlarged schematic diagram of part A in the diagram; Figure 3 for Figure 1 An enlarged schematic diagram of part B in the diagram; Figure 4 This is a schematic diagram of the assembly of the floating component, the second lever, the second spring plate, and the exhaust box. Figure 5 for Figure 4 An enlarged schematic diagram of part C in the diagram; Figure 6 for Figure 4 An enlarged schematic diagram of part D in the diagram; Figure 7 An exploded view of the rotating shaft and the movable sleeve; Figure 8 This is a schematic diagram of the assembly of the floating component and the exhaust box under normal conditions. Figure 9 A schematic diagram showing the assembly of the floating component and the exhaust box after the battery has bulged. Figure 10 A schematic diagram of the movement trajectory of the second shifter after the battery bulges. Figure label: 1. Packaging film; 2. Limiting film; 3. Battery cell; 4. Wing plate; 5. First adhesive tape; 6. Floating plate; 7. Mounting plate; 8. Baffle; 9. Exhaust port; 10. Rotating shaft; 11. Second lever; 12. Second adhesive tape; 13. Elastic strip; 14. Exhaust box; 15. First lever; 16. Sleeve; 17. Movable sleeve; 18. Second spring plate; 19. Fixing rod; 20. Metal wire; 21. First spring plate; 22. Push rod; 23. Sealing plug; 24. Exhaust hole. Detailed Implementation Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0016] The following describes an embodiment of the pouch-type secondary battery with reference to the accompanying drawings.

[0017] like Figures 1-10 As shown in the figure, an embodiment of the present invention proposes a pouch-type secondary battery, including: a battery cell 3, a baffle 8, and a floating component. The battery cell 3 is covered with an elastic packaging film 1. The two sides of the baffle 8 are respectively fixedly connected to the front end of the battery cell 3 by mounting plates 7. A space for gas passage is left between the baffle 8 and the battery cell 3. The baffle 8 is located inside the packaging film 1, and an exhaust port 9 is provided on the baffle 8, which penetrates the packaging film 1. The floating component is rotatably connected to the mounting plate 7 by a rotating shaft 10. The floating component includes a floating plate 6 and a first wave that are perpendicularly connected to each other. The first lever 15 is connected to the upper end face of the battery cell 3 and the packaging film 1. The rotating shaft 10 passes through and is fixed at the junction of the floating plate 6 and the first lever 15. The floating plate 6 is located between the upper end face of the battery cell 3 and the packaging film 1 and is bonded to the packaging film 1. The first lever 15 is located between the battery cell 3 and the baffle 8. There is space between the first lever 15 and the front end face of the battery cell 3 for the first lever 15 to swing. The sealing plug 23 is fixedly connected to the side of the first lever 15 facing the exhaust port 9. Under normal conditions, the sealing plug 23 seals the exhaust port 9 to prevent external gas from entering the interior of the packaging film 1 through the exhaust port 9.

[0018] By incorporating a floating element, this embodiment of the invention allows for the rapid discharge of gas from inside the packaging film 1, thereby reducing the risk of battery explosion.

[0019] When a pouch battery bulges, the internal air pressure of the packaging film 1 increases, causing the packaging film 1 to bulge outward along the thickness direction of the battery cell 3, forming an arched cross-section. This causes the floating plate 6 to rotate around the pivot 10 in the direction of the bulging of the packaging film 1. Consequently, the first deflector 15 deflects towards the battery cell 3, and the sealing plug 23 moves out of the vent 9, opening the vent 9 and releasing the seal. If the battery oxidation reaction is severe, the floating plate 6 continues to rotate, causing the first deflector 15 to move away from the vent 9, achieving staged venting.

[0020] In some embodiments, such as Figure 1 As shown, the floating plate 6 is strip-shaped, and the two sides of the end of the floating plate 6 are connected to the wing plate 4 by elastic strips 13. The wing plate 4 is symmetrically arranged on both sides of the floating plate 6, and the wing plate 4 is bonded to the packaging film 1.

[0021] By setting the wing plate 4, both the wing plate 4 and the floating plate 6 move synchronously with the raised part of the packaging film 1, which increases the bonding area with the packaging film 1 and prevents the floating plate 6 from falling off the packaging film 1, which would prevent the floating plate 6 from rotating after bulging, thus preventing smooth air exhaust. By setting the elastic strip 13, the wing plate 4 can be tightly attached to the packaging film 1 after it bulges.

[0022] It is understandable that the packaging film 1 will undergo elastic deformation during the bulging process, resulting in the wing plate 4 not being tightly attached to the packaging film 1. By setting the elastic strip 13, the wing plate 4 is flexibly connected to the floating plate 6, so that the wing plate 4 can better fit the arched shape of the packaging film 1.

[0023] Furthermore, the elastic strip 13 is made of rubber.

[0024] In some embodiments, such as Figure 1 As shown, a first tape 5 is fixedly connected to the front of the floating plate 6, and a second tape 12 is fixedly connected to the wing plate 4. The first tape 5 and the second tape 12 are respectively bonded to the packaging film 1.

[0025] Furthermore, both the first tape 5 and the second tape 12 are double-sided tapes and are made of heat-resistant adhesive, which maintains good adhesion even after the battery heats up.

[0026] In some embodiments, such as Figure 1 As shown, a limiting film 2 is fixedly connected to the inner side of the packaging film 1. The limiting film 2 is located at the upper end of the battery cell 3. The front and rear ends of the limiting film 2 have through openings. A sandwich is formed between the limiting film 2 and the packaging film 1. The floating plate 6 and the wing plate 4 are inserted into the sandwich through the openings and extend out of the limiting film 2. The first tape 5 and the second tape 12 are located outside the limiting film 2.

[0027] In some embodiments, such as Figures 4-5 As shown, a fixing rod 19 is fixedly connected between the two mounting plates 7. A first spring plate 21 is fixedly connected to the fixing rod 19. The first spring plate 21 is located between the first lever 15 and the battery cell 3. The end of the first spring plate 21 abuts against the first lever 15 to provide a restoring force to the first lever 15.

[0028] Under normal conditions, the pressure exerted by the first spring plate 21 on the first lever 15 causes the first lever 15 to tightly engage the sealing plug 23 into the vent port 9, preventing external gas from entering the packaging film 1. When the packaging film 1 bulges, it drives the first lever 15 to move the sealing plug 23 out of the vent port 9, allowing gas to escape. After venting is complete, the first lever 15 returns to its original position under the elastic restoring force of the first spring plate 21, causing the sealing plug 23 to tightly engage again into the vent port 9 for sealing.

[0029] In some embodiments, such as Figure 5 As shown, the first spring plate 21 has a bent insert, and the fixing rod 19 has two slots. The inserts of the two first spring plates 21 are respectively inserted into the two slots and locked by the locking member.

[0030] Furthermore, the locking component is a metal wire 20. The fixing rod 19 has two first through holes in the vertical direction, and each insert has a second through hole in the same position as the first through holes. After the insert is inserted into the slot, the metal wire 20 is passed through the two first through holes and connected to the two inserts in series. After being inserted into place, the two ends of the metal wire 20 are bent to lock the insert. By using the metal wire 20 to lock and fix the first spring plate 21, it is easy to disassemble and assemble the first spring plate 21.

[0031] Furthermore, the hazards of pouch battery bulging to the working environment vary depending on the different operating conditions of the pouch battery. If the working environment of the pouch battery is more sensitive to bulging, the first spring plate 21 with smaller elasticity can be replaced to reduce the rotation resistance of the floating plate 6. The lower air pressure generated inside the packaging film 1 can trigger the rotation of the floating plate 6, which in turn triggers the subsequent venting behavior.

[0032] In some embodiments, such as Figure 4 , Figure 8 , Figure 9 As shown, an exhaust box 14 is fixedly connected to the inner side of the baffle 8 at the exhaust port 9. The interior of the exhaust box 14 forms an exhaust chamber, which communicates with the exhaust port 9. An exhaust hole 24 is opened on the side wall of the exhaust box 14 facing the battery cell 3. Under normal conditions, the sealing plug 23 is sealed at the exhaust hole 24. Due to the squeezing force of the first spring plate 21 on the first lever 15, the first lever 15 tightly clamps the sealing plug 23 into the exhaust hole 24.

[0033] In some embodiments, such as Figure 9 As shown, there are two exhaust holes 24 located on the upper and lower sides of the exhaust box 14. There are two floating parts and two rotating shafts 10. Two floating plates 6 are symmetrically arranged on the upper and lower ends of the battery cell 3. Two first levers 15 are respectively located on the upper and lower ends of the front end of the battery cell 3. The sealing plugs 23 of the two first levers 15 are respectively sealed in the two exhaust holes 24. The two rotating shafts 10 are respectively fixedly connected to the two floating parts. Two first spring plates 21 are fixedly connected to the fixed rod 19. The two first spring plates 21 are respectively connected to the upper and lower ends of the fixed rod 19 and respectively abut against the two first levers 15.

[0034] By setting two symmetrical floating parts, when the pouch battery bulges, the two floating parts deflect to the upper and lower sides respectively, so that the upper and lower sides of the baffle 8 are evenly stressed, and the baffle 8 is prevented from shifting when the floating parts rotate.

[0035] Furthermore, there are two limiting films 2, which are respectively located on the upper and lower sides inside the packaging film 1, and each forms a sandwich with the packaging film 1, and the two floating plates 6 are respectively inserted into the two sandwiches.

[0036] In some embodiments, such as Figure 10As shown, the rotating shaft 10 is fixedly connected to the floating component. The two ends of the rotating shaft 10 are rotatably connected to the two mounting plates 7 respectively. The two sides of the baffle 8 are symmetrically fixedly connected to the second spring plates 18. The two second spring plates 18 are respectively attached to the two sides of the battery cell 3. The outward side of the second spring plate is fixedly connected to the second lever 11. The second lever 11 has a circular arc cylindrical structure. Under normal conditions, the two second levers 11 are attached to the inner side of the packaging film 1. The two ends of the rotating shaft 10 extend outward from the outside of the mounting plate 7 respectively. The end of the rotating shaft 10 is connected to the movable sleeve 17 by a thread. The end of the rotating shaft 10 is provided with an external thread, and the movable sleeve 17 is provided with an internal thread. The movable sleeve 17 has an external hexagonal structure. A sleeve 16 is fixedly connected to the outside of the mounting plate 7. The sleeve 16 has an internal hexagonal structure. The movable sleeve 17 is inserted into the sleeve 16 in the horizontal direction and the top end of the movable sleeve 17 extends out of the sleeve 16. The sleeve 16 and the movable sleeve are in sliding fit. The top end of the movable sleeve 17 abuts against the second spring plate 18.

[0037] By setting the second spring plate 18 and the second lever 11, they can move synchronously with the first lever 15 to accelerate the discharge of gas from the packaging film 1.

[0038] When a battery bulge occurs, the rotation of the floating plate 6 drives the rotating shaft 10 to rotate. Since the rotating shaft 10 is threadedly connected to the movable sleeve 17, and due to the limiting effect of the sleeve 16, the movable sleeve 17 moves horizontally along the sleeve 16, thereby actuating the second spring plate 18 and causing the second lever 11 to expand outwards. This accelerates the discharge of gas from the battery cell 3 into the space inside the packaging film 1, and further accelerates the discharge of gas from inside the packaging film 1. Furthermore, the second lever 11 expands the packaging film 1 outwards along its width. As the width of the packaging film 1 increases, its thickness is rapidly compressed, allowing it to quickly recover in the thickness direction, accelerating the discharge of gas from inside the packaging film 1 and reducing the risk of explosion.

[0039] In some embodiments, such as Figure 6 , Figure 7 As shown, a push rod 22 is fixedly connected to the bottom of the outward-facing end of the movable sleeve 17. The push rod 22 and the movable sleeve 17 together abut against the second spring plate 18. By setting the push rod 22, the contact area with the second spring plate 18 can be increased, making it easier to push the second spring plate 18 outward.

[0040] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0042] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0044] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A pouch-type secondary battery, characterized in that, include: The battery cell is covered with an elastic packaging film. A baffle is fixedly connected to the front end of the battery cell on both sides by mounting plates. A space for gas to pass through is left between the baffle and the battery cell. The baffle is located inside the packaging film and has an exhaust port that penetrates the packaging film. A floating component is rotatably connected to a mounting plate via a rotating shaft. The floating component includes a floating plate and a first lever connected perpendicularly to each other. The rotating shaft passes through and is fixed at the junction of the floating plate and the first lever. The floating plate is located between the upper end face of the battery cell and the packaging film and is bonded to the packaging film. The first lever is located between the battery cell and the baffle. A space is left between the first lever and the front end face of the battery cell for the first lever to swing. A sealing plug is fixedly connected to the side of the first lever facing the exhaust port. Under normal conditions, the sealing plug seals the exhaust port.

2. The pouch-type secondary battery according to claim 1, characterized in that, The floating plate is strip-shaped, and the two sides of the ends of the floating plate are connected to the wing plates by elastic strips. The wing plates are symmetrically arranged on both sides of the floating plate and are bonded to the packaging film.

3. The pouch-type secondary battery according to claim 2, characterized in that, A first tape is fixedly connected to the front of the floating plate, and a second tape is fixedly connected to the wing plate. The first tape and the second tape are respectively bonded to the packaging film.

4. The pouch-type secondary battery according to claim 3, characterized in that, A limiting film is fixedly connected to the inner side of the packaging film. The limiting film is located at the upper end of the battery cell. The front and rear ends of the limiting film have through openings. A sandwich is formed between the limiting film and the packaging film. The floating plate and the wing plate are inserted into the sandwich through the openings and extend out of the limiting film. The first tape and the second tape are located outside the limiting film.

5. The pouch-type secondary battery according to claim 1, characterized in that, A fixing rod is fixedly connected between the two mounting plates, and a first spring plate is fixedly connected to the fixing rod. The first spring plate is located between the first lever and the battery cell, and the end of the first spring plate abuts against the first lever to provide a restoring force to the first lever.

6. The pouch-type secondary battery according to claim 5, characterized in that, The first spring sheet has a bent insert, and the fixing rod has two slots. The inserts of the two first spring sheets are respectively inserted into the two slots and locked by a locking member.

7. The pouch-type secondary battery according to claim 5, characterized in that, An exhaust box is fixedly connected to the inner side of the baffle at the exhaust port. An exhaust chamber is formed inside the exhaust box and is connected to the exhaust port. An exhaust hole is opened on the side wall of the exhaust box facing the battery cell. Under normal conditions, the sealing plug is sealed at the exhaust hole.

8. The pouch-type secondary battery according to claim 7, characterized in that, The exhaust port is provided in two locations on the upper and lower sides of the exhaust box. There are two floating components and two rotating shafts. The two floating plates are symmetrically arranged on the upper and lower ends of the battery cell. The two first levers are respectively located on the upper and lower ends of the front end of the battery cell. The sealing plugs of the two first levers are respectively sealed in the two exhaust ports. The two rotating shafts are respectively fixedly connected to the two floating components. The fixed rod is fixedly connected to two first spring plates. The two first spring plates are respectively connected to the upper and lower ends of the fixed rod and respectively abut against the two first levers.

9. The pouch-type secondary battery according to claim 8, characterized in that, The rotating shaft is fixedly connected to the floating component. Both ends of the rotating shaft are rotatably connected to the two mounting plates. The two sides of the baffle are symmetrically fixedly connected to the second spring plates. The two second spring plates are respectively close to the two sides of the battery cell. The outward side of the second spring plate is fixedly connected to the second lever. The second lever has an arc-shaped cylindrical structure. In the normal state, the two second levers are close to the inner side of the packaging film. Both ends of the rotating shaft extend outward from the mounting plate. The end of the rotating shaft is connected to the movable sleeve through a thread. The end of the rotating shaft is provided with an external thread. The movable sleeve is provided with an internal thread. The movable sleeve has an external hexagonal structure. A sleeve is fixedly connected to the outer side of the mounting plate. The sleeve has an internal hexagonal structure. The movable sleeve is inserted into the sleeve in a horizontal direction and the top end of the movable sleeve extends out of the sleeve. The sleeve and the movable sleeve are slidably engaged. The top end of the movable sleeve abuts against the second spring plate.

10. The pouch-type secondary battery according to claim 9, characterized in that, A push rod is fixedly connected to the bottom of the outward-facing end of the movable sleeve, and the push rod and the movable sleeve together abut against the second spring plate.

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