Soft package battery packaging reliability detection tool

Abstract

The utility model discloses a detection tool for packaging reliability of a soft package battery. The detection tool comprises a bottom plate, a movable plate and an upper plate which are sequentially distributed at intervals from bottom to top, four corners at the bottom of the upper plate are fixedly connected with four corners at the top of the bottom plate through guide columns respectively; a linear bearing is arranged at the position, corresponding to each guide column, of the movable plate; each guide column penetrates through one linear bearing. A fixing plate is arranged at the top of the upper plate; the center of the fixing plate is in threaded connection with the second lead screw. Stress application rods are arranged at the tops of the second lead screws; the lower end of the second screw is connected with the upper end of the first screw through a connecting block; the first lead screw perpendicularly penetrates through the movable plate and then is connected with the upper end of the connecting plate. Top blocks are arranged at the bottoms of the connecting plates; sealing rings are arranged at the bottoms of the ejector blocks; the top block is used for pressing the soft package battery downwards; and the inner cavity of the soft package battery is communicated with an air outlet of external inflation equipment through the connecting plate. According to the utility model, the reliability of the soft package battery packaging can be effectively detected, and the packaging strength of the soft package battery can be further evaluated.

Description

Technical Field

[0001] This utility model relates to the field of soft-pack battery packaging reliability testing technology, and in particular to a soft-pack battery packaging reliability testing fixture. Background Technology

[0002] Lithium-ion batteries have advantages such as high specific energy, high cycle life, and long storage time. They are widely used not only in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and power tools. Therefore, the performance requirements for lithium-ion batteries are becoming increasingly stringent.

[0003] Pouch batteries, a common type of lithium-ion battery, boast advantages such as high energy density, excellent safety performance, and good rate performance, making them widely used in drones, new energy vehicles, and power banks. However, existing methods for testing the reliability of pouch battery packaging have certain limitations. They struggle to effectively detect weak areas within the packaging region formed by the aluminum-plastic film encapsulation, which may contain defects such as bubbles, microcracks, and micropores. These defects can easily lead to corrosion and leakage during subsequent cell use, potentially causing safety incidents.

[0004] Currently, existing methods for testing the packaging reliability of pouch batteries mainly evaluate them by checking residual aluminum after aluminum-plastic film encapsulation, the residual thickness of the inner thermoplastic resin layer, and the morphology of excess adhesive. However, this method differs significantly from actual operating conditions. In reality, during use, the gas generated by internal chemical reactions in pouch batteries can cause the encapsulated area to gradually expand from the inside, leading to encapsulation failure.

[0005] Therefore, there is an urgent need to develop a technology that can effectively detect the reliability of pouch cell packaging and identify weak areas in the pouch cell packaging area that may contain defects such as bubbles, microcracks, and micropores. Utility Model Content

[0006] The purpose of this invention is to address the technical deficiencies in existing technologies by providing a tooling for testing the reliability of soft-pack battery packaging.

[0007] Therefore, this utility model provides a soft-pack battery packaging reliability testing fixture, which includes a base plate, a movable plate and an upper plate that are distributed at intervals from bottom to top;

[0008] The bottom four corners of the upper plate are fixedly connected to the top four corners of the base plate by a guide post;

[0009] The movable plate is equipped with a linear bearing at a position corresponding to each guide post;

[0010] Each guide post passes through the central through-hole of a linear bearing;

[0011] A fixing plate is fixedly installed at the top center of the upper plate;

[0012] The center of the fixed plate is threadedly connected to a vertically distributed second lead screw;

[0013] A force-applying rod is fixedly installed at the top of the second lead screw;

[0014] The lower end of the second lead screw is connected to the upper end of the first lead screw via a connecting block;

[0015] After the first lead screw passes vertically through the center of the moving plate, it is fixedly connected to the upper end of a connecting plate.

[0016] A top block is provided at the bottom of the connecting plate;

[0017] A sealing ring is provided around the bottom of the top block;

[0018] The top block is used to press down on the soft-pack battery to be tested;

[0019] The top block has a hollow structure;

[0020] The inner cavity of the pouch battery is connected to the air outlet of an external inflation device via a top block.

[0021] As can be seen from the technical solution provided by this utility model above, compared with the prior art, this utility model provides a tooling for testing the reliability of soft-pack battery packaging. It is scientifically designed and can effectively test the reliability of the battery packaging, which is beneficial for further evaluating the packaging strength of soft-pack batteries and has significant practical significance.

[0022] This invention relates to an air-injection fixture for identifying weak areas in the packaging of pouch batteries. It works by drilling holes in the battery surface and injecting air into the battery from the outside. When the internal pressure reaches a certain level, the aluminum-plastic packaging of the battery will burst from one side, thus identifying the weak areas of the battery packaging. The purpose of this fixture is to establish a gas channel between the external air injection and the internal battery, allowing gas to enter the battery smoothly without leakage from other locations. This simulates the increased internal gas pressure of the battery under actual operating conditions, thereby detecting the weak areas of the pouch battery packaging.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. It can effectively detect weak areas such as bubbles, microcracks, and micropores that may exist in the packaging area of ​​soft-pack batteries, thereby making targeted improvements to the weak areas of the packaging.

[0025] 2. This utility model simulates the situation in actual use where the chemical reaction inside the battery produces gas, causing the encapsulation part to be gradually expanded from the inside, and thus the encapsulation fails, by inflating the battery with air. This is closer to the actual working conditions.

[0026] 3. This utility model establishes a gas channel between external inflation and the inside of the battery, allowing gas to smoothly enter the battery without leaking from other locations, thus avoiding the gas leakage problem present in existing conventional devices.

[0027] 4. By controlling the air pressure, this utility model can effectively detect weak areas in the battery packaging, thus improving detection efficiency and accuracy. Attached Figure Description

[0028] Figure 1 A three-dimensional structural diagram of a soft-pack battery packaging reliability testing fixture provided by this utility model;

[0029] Figure 2 A schematic diagram showing the working state of the top block, the pad block, and the soft-pack battery in a soft-pack battery packaging reliability testing fixture provided by this utility model;

[0030] In the diagram: 1. Base plate, 2. Moving plate, 3. Top plate, 4. First lead screw, 5. Force extension rod;

[0031] 6. Second lead screw; 7. Linear bearing; 8. Guide column; 9. Top plate; 10. Anti-rotation fixing component;

[0032] 11. Connecting plate; 12. Top block; 13. Pad block; 14. Sealing ring; 15. Fixing plate; 16. Connecting block; 17. Inflation hole;

[0033] 18. Soft-pack battery; 19. Aluminum-plastic film; 20. Battery electrode assembly. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] In the description of this utility model, 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", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this patent according to the specific circumstances.

[0037] 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 one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0038] See Figure 1 , Figure 2 This utility model provides a soft-pack battery packaging reliability testing fixture, which includes a base plate 1, a movable plate 2 and an upper plate 3 arranged at intervals from bottom to top;

[0039] The bottom four corners of the upper plate 3 are fixedly connected to the top four corners of the bottom plate 1 by a guide post 8;

[0040] The movable plate 2 is provided with a linear bearing 7 at a position corresponding to each guide post;

[0041] Each guide post 8 passes through the central through hole of a linear bearing 7;

[0042] A fixing plate 15 is fixedly installed at the top center position of the upper plate 3;

[0043] The center of the fixed plate 15 is threadedly connected to a vertically distributed second lead screw 6.

[0044] A force-applying rod 5 is fixedly installed at the top of the second lead screw 6;

[0045] The lower end of the second lead screw 6 is connected to the upper end of the first lead screw 4 through a connecting block 16;

[0046] After the first lead screw 4 passes vertically through the center of the moving plate 2, it is fixedly connected to the upper end of a connecting plate 11.

[0047] A top block 12 is provided at the bottom of the connecting plate 11;

[0048] A sealing ring 14 is provided around the bottom of the top block 12;

[0049] Top block 12 is used to press down on the soft-pack battery 18 to be tested;

[0050] Top block 12 has a hollow structure;

[0051] The inner cavity of the pouch battery 18 is connected to the air outlet of an external inflation device (e.g., an inflation pump) via the top block 12.

[0052] In this invention, specifically, the soft-pack battery 18 to be tested is placed flat (i.e., horizontally or lying flat), and the vertical direction of the battery is its thickness direction.

[0053] In this utility model, specifically, an air inlet 17 is provided on the front side wall of the top block 12, and a gas injection hole is provided on the bottom panel of the top block 12.

[0054] The inflation port 17 and the gas injection port are connected to the inner cavity of the connecting plate 11;

[0055] In practice, the aluminum-plastic film 19 encapsulated on the top of the soft-pack battery 18 is provided with (i.e. has an air inlet).

[0056] The air intake is connected to the inner cavity of the soft-pack battery 18;

[0057] When the top block 12 on the connecting plate 11 presses down on the soft-pack battery 18, the air inlet on the aluminum-plastic film 19 encapsulated on the top of the soft-pack battery 18 is located inside the gas injection hole of the top block 12.

[0058] Furthermore, the inner cavity of the pouch battery 18 is specifically the gap between the battery electrode assembly inside the pouch battery 18 and the aluminum-plastic film 19 encapsulated on the outer surface of the pouch battery 18.

[0059] In practice, the gas injection hole at the bottom of the top block 12 is circular.

[0060] In this utility model, specifically, the side of the fixing plate 15 is connected to an anti-rotation fixing member 10;

[0061] The anti-rotation fixing member 10 is used to prevent the second lead screw 6 from continuing to rotate when it comes into contact with the inner side of the fixing plate 15.

[0062] In practice, one end of the anti-rotation fixing part 10 is a threaded rod;

[0063] After passing through the threaded through hole on one side of the fixed plate 15, the threaded rod abuts against the side of the second lead screw 6 (i.e., it is in tight contact with the side), and the threaded rod is threadedly connected to the threaded through hole on one side of the fixed plate 15.

[0064] In this utility model, specifically, the connecting block 16 is located directly below the upper plate 3;

[0065] The upper end of the connecting block 16 has a first threaded mating hole with a top opening;

[0066] The lower end of the connecting block 16 has a second threaded mating hole with a bottom opening;

[0067] The first threaded mating hole is threadedly fixedly connected to the lower end of the second lead screw 6;

[0068] The second threaded mating hole is threadedly fixedly connected to the upper end of the first lead screw 4.

[0069] In this utility model, specifically, a top plate 9 is provided at the center of the top of the movable plate 2;

[0070] A threaded through hole is provided at the center of the top plate 9;

[0071] The movable plate 2 is provided with a movable plate threaded through hole at a position corresponding to the threaded through hole of the top plate;

[0072] The first lead screw 4 passes through the corresponding threaded through holes in the top plate and the moving plate in sequence, and is threadedly connected to the threaded through holes in the top plate and the moving plate.

[0073] In this invention, specifically, the central axis of the second lead screw 6 is perpendicular to the central axis of the force-applying rod 5.

[0074] In this invention, specifically, the guide post 8 and the central through hole of the linear bearing 7 are in clearance fit.

[0075] In this invention, specifically, the top view of the sealing ring 14 is circular.

[0076] In this invention, specifically, the sealing ring 14 is an elastic sealing rubber ring.

[0077] In this utility model, specifically, both the first lead screw 4 and the second lead screw 6 are trapezoidal lead screws.

[0078] In this invention, specifically, the center points of the base plate 1, the movable plate 2, and the upper plate 3 are located on the same vertical central axis.

[0079] In this invention, specifically, the air outlet of the external inflation device (e.g., an air pump) is connected to one end of the hollow air nozzle through a hollow connecting pipe (e.g., a rubber hose).

[0080] The other end of the air nozzle is connected to the air inlet 17 on the top block 12;

[0081] In practice, the air nozzle is a threaded air nozzle (i.e., the outer surface has threads);

[0082] The air inlet 17 on the top block 12 is an internally threaded through hole;

[0083] The air nozzle is threadedly sealed to the air inlet 17 on the top block 12.

[0084] In practice, a pressure gauge (i.e., a pneumatic gauge) is installed on the connecting pipe (e.g., a rubber hose);

[0085] It should be noted that the function of a pressure gauge is to display the pressure value within the connecting pipe, i.e., the inflation pressure. For accurate representation of the inflation pressure, a digital pressure gauge is preferred.

[0086] In this invention, specifically, the gas introduced by the external inflation device (e.g., an inflation pump) can be an inert gas (helium or argon) or air.

[0087] In this utility model, for specific implementation, see [link to relevant documentation]. Figure 2 As shown, the tooling of this utility model also includes a pad block 13;

[0088] The pad 13 is used to be pre-inserted inside the aluminum-plastic film 19 that encapsulates the outer surface of the pouch battery 18;

[0089] It should be noted that the soft-pack battery 18 includes battery electrode assembly 20 and aluminum-plastic film 19;

[0090] An aluminum-plastic film 19 is wrapped around the outside of the battery electrode assembly 20;

[0091] In practice, the pad 13 is located between the battery electrode group 20 inside the soft-pack battery 18 and the aluminum-plastic film 19 encapsulated on the outer surface of the soft-pack battery 18 (in the gap).

[0092] Furthermore, the pad 13 is located at the center of the battery electrode group 20 inside the soft-pack battery 18, that is, at the center of the battery electrode group 20 inside the soft-pack battery 18 below the aluminum-plastic film 19 (i.e., aluminum-plastic layer).

[0093] It should be noted that, in this utility model, the pad 13 is placed at the center of one side of the soft-pack battery 18 (i.e., the aluminum-plastic layer) below the aluminum-plastic film 19 (i.e., the aluminum-plastic layer). The pad 13 is rectangular in shape and has a ventilation structure inside. One end of the ventilation structure is connected to the inner cavity of the soft-pack battery 18 (specifically, the gap between the battery electrode group inside the soft-pack battery 18 and the aluminum-plastic film 19 encapsulated on the outer surface of the soft-pack battery 18). The other end of the ventilation structure is connected to the gas injection hole at the bottom of the top block 12 through an air inlet provided on the aluminum-plastic film 19 encapsulated on the top of the soft-pack battery 18.

[0094] In specific implementation, the ventilation structure includes a vertical air inlet hole and a horizontal air vent hole in the pad.

[0095] The vertical air inlet of the pad is located at the upper center of the pad 13, and its top opening is connected to the gas injection hole at the bottom of the top block 12 through the air inlet provided on the aluminum-plastic film 19 encapsulated on the top of the soft-pack battery 18.

[0096] The horizontal vent hole of the pad is located in the middle of the pad 13, and its inner side is connected to the lower end of the vertical air inlet of the pad.

[0097] The outer opening of the horizontal vent hole of the pad is connected to the inner cavity of the soft-pack battery 18 (specifically, the gap between the battery electrode group inside the soft-pack battery 18 and the aluminum-plastic film 19 encapsulated on the outer surface of the soft-pack battery 18).

[0098] Furthermore, the horizontal vent holes of the pad block are cross-shaped through holes;

[0099] Furthermore, the horizontal vent holes of the pad block include transverse through holes and longitudinal through holes;

[0100] The transverse through hole passes through the middle of the pad block 13;

[0101] The longitudinal through hole passes through the middle of the pad 13.

[0102] The transverse and longitudinal through holes intersect and connect with each other, and the point where they connect is connected to the lower end of the vertical air inlet of the pad block.

[0103] It should be noted that, in this utility model, a hole is drilled in the center of the upper surface of the pad 13 to half the thickness of the pad, forming a vertical air inlet hole, which is connected to the through holes in both the horizontal and vertical directions (i.e., the horizontal air vents of the pad). Air is pumped through the surface hole (i.e., the vertical air inlet hole of the pad) and exits into the battery through the through holes (i.e., the horizontal air vents of the pad).

[0104] See Figure 2As shown, before the battery is fully encapsulated, the pad 13 is placed between the battery electrode assembly and the aluminum-plastic film 19 inside the soft-pack battery 18. The pad 13 is located in the middle of one side of the battery electrode assembly. A hole is drilled in the aluminum-plastic film 19 using a hole punch, and aligned with the air inlet (i.e., the vertical air inlet of the pad) on the pad 13. By applying downward pressure using the tooling of this invention, the top block 12 and the pad 13 are aligned and pressed together, and the sealing ring achieves a seal. The gas injection hole on the top block is aligned with the air inlet on the aluminum-plastic film 19.

[0105] It should be noted that, for this utility model, the pad 13 is located in the gap between the battery electrode group inside the soft-pack battery 18 and the aluminum-plastic film 19 encapsulated on the outer surface of the soft-pack battery 18, that is, the pad is placed at the center position on one side of the battery electrode group inside the battery. The aluminum-plastic film encapsulation of the soft-pack battery 18 in the other three directions (the lower side direction and the front and rear sides direction) does not interfere with the pad 13.

[0106] In practice, the pad 13 is made of 6061 alloy to meet the requirement of no deformation under surface pressure, which will not affect the sealing effect.

[0107] In practice, the pad 13 and the top block 12 are the same size. The surface hole on the pad 13 (i.e., the vertical air inlet hole of the pad) and the opening position of the gas injection hole at the bottom of the top block 12 are the same. Aligning the pad 13 and the top block 12 can ensure that the two holes are connected. At the same time, the diameter of the sealing ring 14 is larger than the diameter of the two openings. Even if the positions of the two holes are slightly misaligned (i.e., not completely aligned, but only partially aligned and connected), the gas can still be kept flowing.

[0108] To better understand the technical solution of this utility model, the working process of this utility model is described below.

[0109] First, before the pouch battery is completely sealed, the gas-filled pad 13 is placed inside the pouch battery and adjusted to a suitable position (e.g., the center position on the side of the battery electrode assembly inside the pouch battery 18), and then the battery is encapsulated.

[0110] Then, a hole is drilled at a predetermined position (e.g., the top center position) on the outer surface of the soft-pack battery to form an air inlet. The air inlet is 2 mm in diameter and can communicate with the air outlet (e.g., air nozzle) of an external inflation device (e.g., an inflation pump) and the vent on the pad 13.

[0111] Then, rotate the force rod 5 so that the sealing ring 14 presses down to the top surface of the soft-pack battery casing to prevent gas leakage; in this process, the surface of the casing around the air inlet is sealed with a sealing ring (i.e., sealing ring 14) to prevent gas from leaking from locations other than the air inlet.

[0112] Then, connect the nozzle of an external inflation device (such as an air pump) to the air inlet on the pouch battery to establish an external inflation and internal gas passage.

[0113] Then, by slowly injecting air into the pouch battery using an external inflation device (such as an inflation pump), the internal air pressure of the pouch battery is gradually increased, avoiding a sudden increase that could damage the aluminum-plastic film encapsulating the pouch battery.

[0114] Then, continue to inflate slowly until one side of the seal bursts. Confirm and record the inflation pressure at this time using a pressure gauge (i.e., an air pressure gauge).

[0115] Next, observe the aluminum-plastic film encapsulating the pouch battery and record the location where it first bursts. This location is then identified as a weak area in the pouch battery encapsulation (i.e., a weak area prone to defects such as bubbles, microcracks, and micropores). For example, if the first burst occurs in the middle area of ​​the battery's side, then this location is identified as a weak area in the pouch battery encapsulation.

[0116] It should be noted that, in practical implementation, for two different pouch cells (e.g., pouch cells produced in two different batches, or pouch cells produced by two different battery manufacturers), if the inflation pressure corresponding to the first pouch cell bursting is higher, it indicates that the pouch cell has higher sealing strength; conversely, if the inflation pressure corresponding to the first pouch cell bursting is lower, it indicates that the pouch cell has lower sealing strength. Therefore, by applying this utility model, it is beneficial to further evaluate and compare the sealing strength of different pouch cells.

[0117] In summary, compared with the prior art, this utility model provides a tooling for testing the reliability of pouch battery packaging. It is scientifically designed and can effectively test the reliability of pouch battery packaging, which is beneficial for further evaluating the packaging strength of pouch batteries and has significant practical significance.

[0118] This invention relates to an air-injection fixture for identifying weak areas in the packaging of pouch batteries. It works by drilling holes in the battery surface and injecting air into the battery from the outside. When the internal pressure reaches a certain level, the aluminum-plastic packaging of the battery will burst from one side, thus identifying the weak areas of the battery packaging. The purpose of this fixture is to establish a gas channel between the external air injection and the internal battery, allowing gas to enter the battery smoothly without leakage from other locations. This simulates the increased internal gas pressure of the battery under actual operating conditions, thereby detecting the weak areas of the pouch battery packaging.

[0119] Compared with the prior art, the soft-pack battery packaging reliability testing fixture provided by this utility model has the following beneficial effects:

[0120] 1. It can effectively detect weak areas such as bubbles, microcracks, and micropores that may exist in the packaging area of ​​soft-pack batteries, thereby making targeted improvements to the weak areas of the packaging.

[0121] 2. This utility model simulates the situation in actual use where the chemical reaction inside the battery produces gas, causing the encapsulation part to be gradually expanded from the inside, and thus the encapsulation fails, by inflating the battery with air. This is closer to the actual working conditions.

[0122] 3. This utility model establishes a gas channel between external air inflation and the inside of the battery, allowing gas to smoothly enter the battery without leaking from other locations, thus avoiding the gas leakage problem present in existing conventional devices;

[0123] 4. By controlling the air pressure, this utility model can effectively detect weak areas in the battery packaging, thus improving detection efficiency and accuracy.

[0124] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A tooling for testing the reliability of pouch battery packaging, characterized in that, It includes a bottom plate (1), a movable plate (2), and an upper plate (3) that are arranged at intervals from bottom to top; The bottom four corners of the upper plate (3) are fixedly connected to the top four corners of the bottom plate (1) by a guide post (8); The movable plate (2) is provided with a linear bearing (7) at the position corresponding to each guide post; Each guide post (8) corresponds to a central through hole of a linear bearing (7); A fixing plate (15) is fixedly installed at the top center of the upper plate (3); The center of the fixed plate (15) is threadedly connected to a vertically distributed second lead screw (6); The top of the second lead screw (6) is fixedly equipped with a force-adding rod (5); The lower end of the second lead screw (6) is connected to the upper end of the first lead screw (4) through a connecting block (16); After the first lead screw (4) passes vertically through the center of the moving plate (2), it is fixedly connected to the upper end of a connecting plate (11); A top block (12) is provided at the bottom of the connecting plate (11); A sealing ring (14) is provided around the bottom of the top block (12); The top block (12) is used to press down on the soft-pack battery (18) to be tested; The top block (12) has a hollow structure; The inner cavity of the soft-pack battery (18) is connected to the air outlet of the external inflation device through the top block (12).

2. The soft-pack battery packaging reliability testing fixture as described in claim 1, characterized in that, An air inlet (17) is provided on the front side wall of the top block (12), and a gas injection hole is provided on the bottom panel of the top block (12). The air inlet (17) and the gas injection inlet are connected to the inner cavity of the top block (12).

3. The soft-pack battery packaging reliability testing fixture as described in claim 2, characterized in that, An air inlet is provided on the aluminum-plastic film (19) that encapsulates the top of the soft-pack battery (18); The air inlet is connected to the inner cavity of the soft-pack battery (18); The inner cavity of the soft-pack battery (18) is specifically the gap between the battery electrode assembly inside the soft-pack battery (18) and the aluminum-plastic film (19) encapsulated on the outer surface of the soft-pack battery (18). When the top block (12) presses down on the soft-pack battery (18), the air inlet on the aluminum-plastic film (19) encapsulated on the top of the soft-pack battery (18) is located inside the gas injection hole of the top block (12).

4. The soft-pack battery packaging reliability testing fixture as described in claim 1, characterized in that, The side of the fixing plate (15) is connected to an anti-rotation fixing member (10); The anti-rotation fixing part (10) is used to prevent the second lead screw (6) from continuing to rotate when it comes into contact with the inner side of the fixing plate (15); One end of the anti-rotation fixing part (10) is a threaded rod; The threaded rod passes through the threaded through hole on one side of the fixed plate (15) and abuts against the side of the second lead screw (6), and the threaded rod is threadedly connected to the threaded through hole on one side of the fixed plate (15).

5. The soft-pack battery packaging reliability testing fixture as described in claim 1, characterized in that, The connecting block (16) is located directly below the upper plate (3); The upper end of the connecting block (16) has a first threaded mating hole with a top opening; The lower end of the connecting block (16) has a second threaded mating hole with a bottom opening; The first threaded mating hole is threadedly fixedly connected to the lower end of the second lead screw (6); The second threaded mating hole is threadedly fixed to the upper end of the first lead screw (4).

6. The soft-pack battery packaging reliability testing fixture as described in claim 1, characterized in that, A top plate (9) is provided at the center of the top of the moving plate (2); A threaded through hole is provided at the center of the top plate (9); The movable plate (2) is provided with a movable plate threaded through hole at a position corresponding to the threaded through hole of the top plate; The first lead screw (4) passes through the corresponding threaded through hole in the top plate and the threaded through hole in the moving plate in sequence, and is threadedly connected to the threaded through hole in the top plate and the threaded through hole in the moving plate.

7. The pouch battery packaging reliability testing fixture as described in any one of claims 1 to 6, characterized in that, The central axis of the second lead screw (6) is perpendicular to the central axis of the force-applying rod (5); And / or, The center points of the base plate (1), the movable plate (2), and the upper plate (3) are located on the same vertical central axis; And / or, The guide post (8) and the central through hole of the linear bearing (7) are in clearance fit; And / or, The top view of the sealing ring (14) is circular; And / or, The sealing ring (14) is an elastic sealing rubber ring; And / or, Both the first lead screw (4) and the second lead screw (6) are trapezoidal lead screws; And / or, The air outlet of the external inflation device is connected to one end of a hollow air nozzle through a hollow connecting pipe; The other end of the air nozzle is connected to the air inlet (17) on the top block (12); The air nozzle is a threaded air nozzle; The air inlet (17) on the top block (12) is an internally threaded through hole; The air nozzle is threadedly sealed to the air inlet (17) on the top block (12); A pressure gauge is installed on the connecting pipe.

8. The pouch battery packaging reliability testing fixture as described in any one of claims 1 to 7, characterized in that, It also includes pads (13); The pad (13) is used to be placed inside the aluminum-plastic film (19) encapsulated on the outer surface of the soft-pack battery (18) in advance. The pad (13) is located between the battery electrode group (20) inside the soft-pack battery (18) and the aluminum-plastic film (19) encapsulated on the outer surface of the soft-pack battery (18). The pad (13) is provided with a ventilation structure. One end of the ventilation structure is connected to the gap between the battery electrode group inside the soft pack battery (18) and the aluminum-plastic film (19) encapsulated on the outer surface of the soft pack battery (18). The other end of the ventilation structure is connected to the gas injection hole at the bottom of the top block (12) through an air inlet provided on the aluminum-plastic film (19) encapsulated on the top of the soft pack battery (18).

9. The soft-pack battery packaging reliability testing fixture as described in claim 8, characterized in that, The pad (13) is located at the center of the battery electrode group (20) inside the soft-pack battery (18); The ventilation structure includes a vertical air inlet hole and a horizontal air vent hole in the pad. The vertical air inlet of the pad is located at the upper center of the pad (13), and its top opening is connected to the gas injection hole at the bottom of the top block (12) through the air inlet provided on the aluminum-plastic film (19) encapsulated on the top of the soft-pack battery (18). The horizontal vent hole of the pad is located in the middle of the pad (13), and its inner side is connected to the lower end of the vertical air inlet of the pad. The outer opening of the horizontal vent hole of the pad is connected to the gap between the battery electrode group inside the soft-pack battery (18) and the aluminum-plastic film (19) encapsulated on the outer surface of the soft-pack battery (18).

10. The pouch battery packaging reliability testing fixture as described in claim 9, characterized in that, The horizontal vent holes of the pad block are arranged in a cross pattern; The horizontal vent holes of the pad block include transverse through holes and longitudinal through holes; The transverse through hole passes through the middle of the pad (13); The longitudinal through hole extends longitudinally through the middle of the pad (13); The transverse and longitudinal through holes intersect and connect with each other, and the point where they connect is connected to the lower end of the vertical air inlet of the pad block.

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