Pressure exhaust device for lithium ion soft package battery

Abstract

The utility model relates to the technical field of lithium battery manufacturing, in particular to a lithium ion soft package battery pressure exhaust device which comprises a sealed box body, and an air exhaust hole is formed in the box body and connected with a negative pressure air exhaust mechanism through a pipeline. A plurality of groups of clamping mechanisms are arranged in the box body from bottom to top, each group of clamping mechanism comprises two clamping plates, the two clamping plates are arranged in parallel, the two clamping plates are connected with electric push rods, the two clamping plates in the same group get close to or get away from each other under the action of the electric push rods, and a clamping space is formed between the two clamping plates; the clamp is used for clamping the soft package battery; the clamping plate is connected with a pressure sensor, the electric push rod is electrically connected with a controller used for controlling starting and stopping of the electric push rod, and the controller is electrically connected with the pressure sensor. The device has the beneficial effects that the gas can be directly exhausted as much as possible after the formation of the soft package battery, so that the quality of the soft package battery can be effectively improved, and excessive residual gas in the soft package battery does not need to be worried.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery manufacturing technical field especially relates to a lithium ion soft package battery pressure exhaust device. BACKGROUND

[0002] Lithium ion soft package battery plays an indispensable role in our life, including electronic consumption, power automobile, battery energy storage etc. However, in practical application, it is mainly liquid organic electrolyte battery, and the thermal stability of traditional lithium battery is poor, and the liquid electrolyte is easy to decompose, volatilize or produce gas under high temperature, short circuit or overcharge, even combustion and explosion. The semi-solid / solid electrolyte replaces organic electrolyte, so that the battery performance is more stable, and the safety performance is obviously improved. However, there are still problems such as battery gas production in semi-solid battery.

[0003] A large amount of gas is generated in the electrolyte and pole piece side reaction in the formation process of lithium ion soft package battery, in order to ensure the normal production of battery cell, a part of aluminum plastic film is reserved when the battery cell is packaged, which is used for storing the gas generated in the formation process, and the reserved part of aluminum plastic film is called battery cell gas bag.

[0004] In the formation process of soft package battery, the current for charging the battery is getting larger and larger, so that the battery starts to produce a large amount of gas during formation, and the gas needs to be discharged in time after the formation is completed, but the existing technical means cannot discharge the gas in the battery sufficiently, and the residual gas in the battery will reduce the battery performance, affect the chemical balance of the battery, cause the capacity attenuation and internal resistance increase of the battery, shorten the service life of the battery, and the safety performance of the battery is poor, and safety accidents such as battery combustion and explosion are prone to occur. UTILITY MODEL CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a lithium ion soft package battery pressure exhaust device, so that the gas generated in the battery formation process is discharged as much as possible.

[0006] The technical scheme for solving the above technical problem is as follows: a lithium ion soft package battery pressure exhaust device, comprising a sealed box, the box is provided with an exhaust hole, the exhaust hole is connected with a negative pressure exhaust mechanism through a pipeline; a plurality of clamping mechanisms are arranged in the box from bottom to top, each clamping mechanism comprises two clamping plates, the two clamping plates are arranged in parallel, the two clamping plates are connected with an electric push rod, the two clamping plates in the same group are close to or away from each other under the action of the electric push rod, and a clamping space is formed between the two clamping plates for clamping the soft package battery.

[0007] The utility model discloses beneficial effect is: when working, electric push rod makes multiple clamping mechanisms from below to above gradually clamping soft package battery in turn, and the pressure of clamping gradually reduces from below to above, thereby realizing the segmented exhaust of soft package battery, and the negative pressure air extraction mechanism exhaust makes the negative pressure in the box when clamping soft package battery, can directly discharge gas as far as possible after the formation of soft package battery, can effectively improve the quality of soft package battery, need not worry about the excessive gas remaining in soft package battery.

[0008] On the basis of the above technical scheme, the utility model further can make the following improvement.

[0009] Further, the clamping plate is connected with a pressure sensor for detecting the pressure of the clamping plate applied to the soft package battery, the electric push rod is electrically connected with a controller for controlling the start and stop of the electric push rod, and the controller is electrically connected with the pressure sensor.

[0010] The beneficial effect of the above further scheme is that by setting the controller and the pressure sensor, the accurate and automatic control of the intensity and sequence of the soft package battery is realized, and the exhaust effect is improved.

[0011] Further, the box wall parallel to the moving direction of the clamping plate is provided with an opening, and the opening is provided with a cover for sealing the opening.

[0012] The beneficial effect of the above further scheme is that the opening is arranged on the box wall parallel to the moving direction of the clamping plate, so that the soft package battery can be conveniently placed between the clamping plates.

[0013] Further, one side edge of the cover is hinged to a side edge of the opening, and the other side edge of the cover is locked and fixedly connected to the side edge of the opening through a locking mechanism.

[0014] The beneficial effect of the above further scheme is that the opening and closing of the cover are facilitated.

[0015] Further, the opening is arranged at the top of the box.

[0016] Further, the electric push rod is fixed on the opposite two side walls of the box, and the electric push rod is sealingly and fixedly connected to the side walls of the box.

[0017] The beneficial effect of the above further scheme is that no excessive mounting structure is needed, the structure is simple, and the installation is convenient.

[0018] Further, two vertical and parallel fixed plates are fixedly arranged in the box, the clamping mechanism is arranged between the two fixed plates, and the electric push rod is fixed on the fixed plates.

[0019] The beneficial effect of the further scheme is that the fixed plate is convenient to install the plurality of electric push rods, and the electric push rod does not need to be drilled and installed on the box, thereby further ensuring the sealing of the whole box.

[0020] Further, the two inner walls of the box are respectively provided with two slots perpendicular to the opening, one end of the slot extends to the opening, and the two vertical sides of the fixed plate are respectively inserted into the slot.

[0021] The beneficial effect of the further scheme is that the slot is convenient to install the fixed plate.

[0022] Further, the number of the electric push rods connected to each clamping plate is two or more, and the two or more electric push rods connected to each clamping plate are arranged at intervals.

[0023] The beneficial effect of the further scheme is that two or more electric push rods are connected to each clamping plate, thereby ensuring that the clamping plate uniformly applies pressure to the soft package battery.

[0024] Further, the pressure sensor is arranged on the side surface of the two clamping plates of the same group facing each other.

[0025] The beneficial effect of the further scheme is that the pressure sensor is arranged on the side surface of the two clamping plates facing each other, the pressure sensor directly acts on the soft package battery, and the force between the soft package battery and the pressure sensor can be directly detected.

[0026] Further, the output end of the electric push rod is fixedly connected to the clamping plate through the pressure sensor.

[0027] The beneficial effect of the further scheme is that the electric push rod is connected to the clamping plate through the pressure sensor, the pressure between the clamping plate and the soft package battery is transmitted to the pressure sensor through the clamping plate, thereby ensuring the pressure of the clamping plate on the soft package battery. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is an internal structure front view of the embodiment one of the utility model;

[0029] Figure 2 It is an internal structure plan view of the embodiment one of the utility model;

[0030] Figure 3 It is an internal structure front view of the embodiment two of the utility model;

[0031] Figure 4 It is an ultrasonic detection diagram of the residual gas in the soft package battery in the experiment one of the utility model;

[0032] Figure 5This is an ultrasonic detection diagram of the residual gas content in the soft-pack battery in Experiment 2 of this utility model;

[0033] Figure 6 This is an ultrasonic detection diagram of the residual gas content in the soft-pack battery in Experiment 3 of this utility model;

[0034] Figure 7 This is an ultrasonic detection diagram of the residual gas content in the soft-pack battery in Experiment 4 of this utility model;

[0035] Figure 8 This is an ultrasonic detection diagram of the residual gas content in the soft-pack battery in Experiment 5 of this utility model;

[0036] Since ultrasound cannot propagate through the air to another medium, its energy will decay sharply when it encounters gas. This is represented by the size of the blank area in the image scanned by the ultrasonic device. The larger the blank area in the image, the more gas there is in the battery, and the smaller the blank area, the less gas there is in the battery.

[0037] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0038] 1. Box body; 2. Exhaust hole; 3. Clamping plate; 4. Electric push rod; 5. Pressure sensor; 6. Opening; 7. Cover; 8. Fixing plate; 9. Slot. DETAILED DESCRIPTION

[0039] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0040] Example 1

[0041] like Figure 1 、 Figure 2 As shown, this embodiment includes a sealed box body 1, which is provided with an exhaust hole 2, and the exhaust hole 2 is connected to a negative pressure exhaust mechanism through a pipe; a plurality of groups of clamping mechanisms are arranged in the box body 1 from bottom to top, and each group of the clamping mechanisms includes two vertically arranged clamping plates 3, the two clamping plates 3 are arranged parallel to each other, and the sides of the two clamping plates 3 away from each other are connected to an electric push rod 4, and the two clamping plates 3 in the same group approach or move away from each other under the action of the electric push rod 4; a pressure sensor 5 for detecting the pressure applied by the clamping plate 3 to the soft-pack battery is connected to the clamping plate 3, the electric push rod 4 is electrically connected to a controller for controlling the start and stop of the electric push rod 4, and the controller is electrically connected to the pressure sensor 5.

[0042] The box 1 is provided with an opening 6 on the wall parallel to the moving direction of the clamping plate 3, and a sealing cover 7 is arranged at the opening 6. In this embodiment, the opening 6 is arranged at the top of the box 1, one side of the cover 7 is hinged to the side of the opening 6, and the other side of the cover 7 is fixedly connected to the side of the opening 6 through a locking mechanism. Alternatively, the opposite two sides of the cover 7 are detachably fixed to the top of the box 1 through buckles.

[0043] In this embodiment, two vertical and parallel fixed plates 8 are fixedly arranged in the box 1, the clamping mechanism is arranged between the two fixed plates 8, and the electric push rod 4 is fixed to the fixed plate 8. Specifically, two insertion grooves 9 perpendicular to the opening 6 are arranged on the opposite two inner walls of the box 1, one end of the insertion groove 9 extends to the opening 6, and the two vertical sides of the fixed plate 8 are respectively inserted into the insertion grooves 9. The arrangement of the insertion grooves 9 can facilitate the installation of the fixed plate 8.

[0044] In this embodiment, the number of electric push rods 4 connected to each clamping plate 3 is two or more, and the two or more electric push rods 4 connected to each clamping plate 3 are arranged at intervals. Each clamping plate 3 is connected to two or more electric push rods 4, which ensures that the clamping plate 3 applies uniform pressure to the soft package battery when clamping the soft package battery.

[0045] Each clamping plate 3 is connected to two or more electric push rods 4, which ensures that the clamping plate 3 applies uniform pressure to the soft package battery when clamping the soft package battery. The pressure sensor 5 is installed on the side of the clamping plate 3 facing each other, and the pressure sensor 5 directly acts on the soft package battery, which can directly detect the force between the soft package battery and the pressure sensor 5.

[0046] Embodiment two

[0047] As shown in Figure 3 This embodiment includes a sealed box 1, the box 1 is provided with an air extraction hole 2, the air extraction hole 2 is connected to a negative pressure air extraction mechanism through a pipeline; a plurality of clamping mechanisms are arranged in the box 1 from bottom to top, each clamping mechanism includes two vertically arranged clamping plates 3, the two clamping plates 3 are arranged in parallel to each other, and the two clamping plates 3 are connected to electric push rods 4 on the sides away from each other, and the two clamping plates 3 in the same group are close to or away from each other under the action of the electric push rod 4; the clamping plate 3 is connected to a pressure sensor 5 for detecting the pressure applied by the clamping plate 3 to the soft package battery, the electric push rod 4 is electrically connected to a controller for controlling the start and stop of the electric push rod 4, and the controller is electrically connected to the pressure sensor 5.

[0048] The box body 1 is provided with an opening 6 on a wall parallel to the direction of movement of the clamping plate 3. A sealing cover 7 is provided at the opening 6. In this embodiment, the opening 6 is provided at the top of the box body 1. One side of the sealing cover 7 is hinged to the side of the opening 6, and the other side of the sealing cover 7 is locked and fixedly connected to the side of the opening 6 via a locking mechanism. Alternatively, the two opposite sides of the sealing cover 7 are detachably fixedly connected to the top of the box body 1 via buckles.

[0049] In this embodiment, the electric push rod 4 is fixed on two opposite side walls of the box body 1. The electric push rod 4 is sealed and fixedly connected to the side walls of the box body 1, does not require excessive installation structures, has a simple structure, and is easy to install.

[0050] In this embodiment, the number of the electric push rods 4 connected to each clamping plate 3 is more than two, and the two or more electric push rods 4 connected to each clamping plate 3 are arranged at intervals. Each clamping plate 3 is connected to more than two electric push rods 4 to ensure that uniform pressure is applied to the soft-pack battery when the clamping plate 3 clamps the soft-pack battery.

[0051] Each clamping plate 3 is connected to two or more electric push rods 4 to ensure that the clamping plate 3 applies uniform pressure to the soft-pack battery when clamping the soft-pack battery. The pressure sensor 5 is installed on the sides of the clamping plate 3 facing each other. The pressure sensor 5 acts directly on the soft-pack battery and can directly detect the force between the soft-pack battery and the pressure sensor 5.

[0052] In addition to the above embodiment, the pressure sensor 5 can also be disposed between the output end of the electric push rod 4 and the clamping plate 3. The specific structure of the electric push rod 4 is conventional in the art. The electric push rod 4 is a novel electric actuator, primarily composed of a motor, a push rod, and other components. This novel linear actuator enables remote and centralized control. The output end of the electric push rod 4 refers to the end of the push rod away from the motor.

[0053] The following describes the working principle of the present invention by taking the number of clamping mechanisms into three groups:

[0054] (1) Place the formed soft-pack battery vertically in the box 1 with the air bag facing upward;

[0055] (2) According to the calculation formula of pressure, P=F / S, wherein P represents pressure, F represents the size of force, and S represents the area of force. Different pressures are designed according to the force area of the soft package battery cell. First, the lowermost group of clamping plates 3 clamps, and a certain force is applied to the bottom of the soft package battery cell. Then, the middle group of clamping plates 3 clamps, and the force applied to the soft package battery cell is slightly smaller than the force applied by the lowermost group of clamping plates 3. Finally, the uppermost group of clamping plates 3 clamps, and the force applied to the soft package battery cell is slightly smaller than the force applied by the middle group of clamping plates 3. The three pairs of clamping plates 3 apply different pressures to different parts of the soft package battery cell, so that the force applied to the soft package battery cell from bottom to top decreases in turn, so as to achieve the effect of segmented exhaust;

[0056] (3) While applying pressure to the soft package battery, the negative pressure exhaust mechanism starts to exhaust vacuum to make the gas in the gap of the cell tab pressed out in time into the air bag.

[0057] The following five groups of experiments are used to illustrate the technical effects of the utility model:

[0058] Experiment 1: Residual situation of gas after soft package battery formation

[0059] This experiment is that the lithium ion soft package battery is not exhausted after formation, and directly sealed by a vacuum sealing machine. The residual amount of gas in the soft package battery is observed. It includes the following steps:

[0060] Place the formed lithium ion soft package battery in the vacuum sealing machine;

[0061] Take out the soft package battery from the box 1, and seal it by using the vacuum sealing machine;

[0062] Use ultrasonic scanning equipment to nondestructively test the residual amount of gas in the soft package battery. As shown in FIG. 1, the blank in the drawing is the residual gas. Figure 4

[0063] Experiment 2: Residual situation of gas after soft package battery formation without using segmented exhaust

[0064] This experiment is that the soft package battery is exhausted after formation, but the force applied to each part of the battery is the same, and the three pairs of clamping plates 3 are closed at the same time, without using segmented exhaust. The residual amount of gas in the soft package battery is observed. It includes the following steps:

[0065] Place the formed lithium ion soft package battery in the box 1 with the air bag upwards;

[0066] Three pairs of clamping plates 3 are used to clamp the soft package battery at the same time with a force of 200N;

[0067] ​At the same time of applying pressure on the battery, the box 1 starts to vacuumize so that the gas between the pressed-out electrode plate gaps is discharged into the gas pocket in time;

[0068] Take out the soft-pack battery from the box 1 and seal it with a vacuum sealing machine;

[0069] Non-destructively test the residual gas amount in the soft-pack battery with an ultrasonic scanning device, as shown in FIG. 5, the blank in the figure is the residual gas. Figure 5

[0070] Experiment Three: Residual Gas in Soft-Pack Battery after Formation Using Segmented Exhaust but Constant Pressure

[0071] This experiment is to perform pressure exhaust on the battery after formation of the soft-pack battery, but the force on each part of the battery is the same but segmented exhaust is used, and the residual gas amount in the soft-pack battery is observed. It includes the following steps:

[0072] Place the formed lithium ion soft-pack battery vertically with the gas pocket upward in the box 1;

[0073] All the three pairs of clamping plates 3 clamp the soft-pack battery from bottom to top in turn with 200N force to perform exhaust;

[0074] At the same time of applying pressure on the soft-pack battery, the box 1 starts to vacuumize so that the gas between the pressed-out electrode plate gaps is discharged into the gas pocket in time.

[0075] Take out the soft-pack battery from the box 1 and seal it with a vacuum sealing machine;

[0076] Non-destructively test the residual gas amount in the soft-pack battery with an ultrasonic scanning device, as shown in FIG. 5, the blank in the figure is the residual gas. Figure 6

[0077] Experiment Four: Residual Gas in Soft-Pack Battery after Formation Using Segmented Exhaust

[0078] This experiment is to perform segmented pressure exhaust on the battery after formation of the soft-pack battery, and the residual gas amount in the soft-pack battery is observed. It includes the following steps:

[0079] Place the formed lithium ion soft-pack battery vertically with the gas pocket upward in the box 1;

[0080] First, the lowermost pair of clamping plates 3 clamps to apply 200N force on the bottom of the soft-pack battery cell, then the middle pair of clamping plates 3 clamps to apply 150N force on the soft-pack battery cell, and finally the uppermost pair of clamping plates 3 clamps to apply 100N force on the soft-pack battery cell. The three pairs of clamping plates 3 apply different pressures on different parts of the soft-pack battery cell, so that the force on the soft-pack battery cell decreases from bottom to top, achieving the effect of segmented exhaust.​​

[0081] At the same time of applying pressure to the battery, the box 1 starts to vacuum so that the gas between the pressed-out electrode plate gaps is discharged in time.

[0082] The soft package battery is taken out from the box 1, and a vacuum sealing machine is used for sealing;

[0083] The ultrasonic scanning device is used for nondestructive testing of the residual gas in the soft package battery, for example, Figure 7 As shown in the figure, the blank in the figure is the residual gas.

[0084] Experiment five: residual gas of soft package battery after formation using segmented exhaust

[0085] This experiment is to observe the residual gas in the soft package battery after formation by segmenting the pressure exhaust of the battery. It includes the following steps:

[0086] The lithium ion soft package battery after formation is placed vertically in the box 1 with the air bag upwards;

[0087] First, the lowermost pair of clamping plates 3 is clamped to apply a force of 300N to the bottom of the soft package battery cell, then the middle pair of clamping plates 3 is tightened to apply a force of 250N to the soft package battery cell, and finally the uppermost pair of clamping plates 3 is tightened to apply a force of 200N to the soft package battery cell. The three pairs of clamping plates 3 apply different pressures to different parts of the soft package battery cell, so that the force received by the soft package battery cell from bottom to top decreases in turn, so as to achieve the effect of segmented exhaust;

[0088] At the same time of applying pressure to the battery, the box 1 starts to vacuum so that the gas between the pressed-out electrode plate gaps is discharged in time.

[0089] The soft package battery is taken out from the box 1, and a vacuum sealing machine is used for sealing;

[0090] The ultrasonic scanning device is used for nondestructive testing of the residual gas in the soft package battery, for example, Figure 8 As shown in the figure, the blank in the figure is the residual gas.

[0091] Because the ultrasonic wave cannot propagate through the air to another medium, the energy of the ultrasonic wave will be sharply attenuated when it encounters gas, which is represented as a blank area in the picture scanned by the ultrasonic device. The larger the blank area in the picture, the more gas in the battery, and the smaller the blank area in the picture, the less gas in the battery. The scanning picture of the soft package battery in experiment one has the largest blank area, i.e. the most air in the battery; the scanning pictures of the soft package batteries in experiments four and five have the smallest blank area, i.e. the least air in the battery. Therefore, by comparing the above five experiments, it can be seen that only the soft package battery using the segmented pressure exhaust device can exhaust the gas sufficiently.

[0092] In the description of the utility model, it needs to understand that the orientation or position relation indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "inner", "outer", "peripheral side", "circumferential direction" and the like is the orientation or position relation based on the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the system or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0093] In the description of the utility model, the meaning of "a plurality of" is at least two, for example, two, three and the like, unless otherwise explicitly specified and limited.

[0094] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the communication or interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0095] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0096] The above is only the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement and the like made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A pressure exhaust device for a lithium-ion soft-pack battery, characterized in that: The invention comprises a sealed box body (1), wherein the box body (1) is provided with an air extraction hole (2), and the air extraction hole (2) is connected to a negative pressure air extraction mechanism through a pipeline; a plurality of groups of clamping mechanisms are arranged from bottom to top in the box body (1), and each group of the clamping mechanisms comprises two clamping plates (3), the two clamping plates (3) are arranged in parallel, and the two clamping plates (3) are both connected to an electric push rod (4), and the two clamping plates (3) in the same group approach or move away from each other under the action of the electric push rod (4), and a clamping space is formed between the two clamping plates (3) for clamping the soft-pack battery.

2. The pressure exhaust device for lithium-ion soft-pack batteries according to claim 1, characterized in that: The clamping plate (3) is connected to a pressure sensor (5) for detecting the pressure applied by the clamping plate (3) to the soft-pack battery. The electric push rod (4) is electrically connected to a controller for controlling the start and stop of the electric push rod (4), and the controller is electrically connected to the pressure sensor (5).

3. The pressure exhaust device for lithium-ion soft-pack batteries according to claim 2, characterized in that: An opening (6) is provided on a wall of the box body (1) parallel to the moving direction of the clamping plate (3), and a cover (7) for sealing the opening (6) is provided at the opening (6).

4. The pressure exhaust device for lithium-ion soft-pack batteries according to claim 3, characterized in that: One side of the cover (7) is hinged to the side of the opening (6), and the other side of the cover (7) is locked and fixedly connected to the side of the opening (6) via a locking mechanism.

5. The pressure exhaust device for lithium-ion soft-pack batteries according to claim 3, characterized in that: The electric push rod (4) is fixed on two opposite side walls of the box body (1), and the electric push rod (4) is sealed and fixedly connected to the side walls of the box body (1).

6. The pressure exhaust device for lithium-ion soft-pack batteries according to claim 3, characterized in that: Two vertically and parallel fixed plates (8) are fixedly provided in the box body (1), the clamping mechanism is provided between the two fixed plates (8), and the electric push rod (4) is fixed on the fixed plates (8).

7. The pressure exhaust device for lithium-ion soft-pack batteries according to claim 6, characterized in that: Two slots (9) perpendicular to the opening (6) are respectively provided on two opposite inner walls of the box body (1), one end of the slot (9) extends to the opening (6), and two vertical side edges of the fixing plate (8) are respectively inserted into the slots (9).

8. A pressure exhaust device for lithium-ion soft-pack batteries according to any one of claims 1 to 7, characterized in that: The number of the electric push rods (4) connected to each clamping plate (3) is more than two, and the two or more electric push rods (4) connected to each clamping plate (3) are arranged at intervals.

9. A pressure exhaust device for lithium-ion soft-pack batteries according to any one of claims 2 to 7, characterized in that: The pressure sensor (5) is arranged on the side surfaces of the two clamping plates (3) in the same group that face each other.

10. A pressure exhaust device for lithium-ion soft-pack batteries according to any one of claims 2 to 7, characterized in that: The output end of the electric push rod (4) is fixedly connected to the clamping plate (3) via the pressure sensor (5).

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