Pouch battery, air tightness detection device, and packaging device

Abstract

The application relates to the technical field of batteries, in particular to a soft package battery, a gas tightness detection device and a packaging device. The soft package battery comprises a soft package battery body, a base and an anti-explosion diaphragm. The base is formed with a flow-through channel, a communication port and a pressure relief port. The soft package battery body is formed with a through port. The base is connected with the soft package battery body, and the flow-through channel is communicated with the inside of the soft package battery body through the communication port and the through port. The anti-explosion diaphragm is installed on the base and covers the pressure relief port. It can be seen that, due to the added pressure relief structure, when the soft package battery produces gas to reach a certain pressure value due to overcharging, overdischarging and the like during use, the anti-explosion diaphragm of the pressure relief structure will be automatically broken to achieve the purpose of early pressure relief, and the safety and reliability of the soft package battery are improved. In addition, during the manufacturing process of the soft package battery, the sealing performance of the whole soft package battery can be detected through the pressure relief structure to prevent the liquid leakage risk caused by poor sealing.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a soft-pack battery, an airtightness testing device, and a packaging device. Background Technology

[0002] With continuous technological advancements and increasing demand for clean energy, lithium-ion batteries, as efficient and environmentally friendly energy storage devices, are gradually becoming an important component of the future energy sector. Against the backdrop of this ever-growing industry, the safety performance requirements for lithium-ion batteries are also becoming increasingly stringent. Currently, most pouch batteries in the industry are completely sealed after assembly due to structural limitations, lacking pressure relief structures. This not only fails to effectively prevent module explosions and thermal runaway caused by severe gas generation within the cells, but also means that pouch batteries lack sealing performance testing and explosion-proof pressure testing during manufacturing, making them prone to leakage, explosions, and other safety hazards during application. Utility Model Content

[0003] The purpose of this application is to provide a soft-pack battery, a gas tightness testing device, and a packaging device, which to a certain extent solves the technical problems of existing soft-pack batteries lacking a pressure relief structure. On the one hand, this makes it impossible to effectively prevent module explosions and thermal runaway caused by severe gas generation inside the battery cell. On the other hand, the manufacturing process of soft-pack batteries does not involve sealing performance testing or explosion-proof pressure testing, which makes them prone to leakage, explosions, and other safety hazards during application.

[0004] This application provides a soft-pack battery, including: a soft-pack battery body, a base, and an explosion-proof diaphragm; wherein, the base forms a flow channel and a communication port and a pressure relief port connected to the flow channel, and the soft-pack battery body forms a conductive port connected to its interior.

[0005] The base is connected to the soft-pack battery body, and the flow channel of the base is connected to the interior of the soft-pack battery body through the connecting port and the conductive port. The explosion-proof membrane is installed on the base and covers the pressure relief port. When the gas pressure inside the soft-pack battery body is greater than a preset value, the gas can break through the explosion-proof membrane and be released through the pressure relief port.

[0006] In the above technical solution, further, the side of the soft-pack battery body is formed with a first encapsulation edge and a second encapsulation edge that are pressed together along the thickness direction of the soft-pack battery body, and the conduction port is formed between the root of the first encapsulation edge and the root of the first encapsulation edge, and the first encapsulation edge covers one side of the base, the second encapsulation edge covers the opposite side of the base, and at least the pressure relief port of the base is exposed to the first encapsulation edge and the second encapsulation edge.

[0007] In any of the above technical solutions, the first packaging edge and the second packaging edge are further connected to the base by a heat-sealing connection.

[0008] In any of the above technical solutions, the base is made of polypropylene, and the encapsulation edge is made of aluminum-plastic film.

[0009] In any of the above technical solutions, further, mating plate portions are formed on opposite sides of the base, and each of the mating plate portions is pressed between the first encapsulation edge portion and the second encapsulation edge portion.

[0010] In any of the above technical solutions, the soft-pack battery further includes a protective pad, which is pressed onto the side of the explosion-proof diaphragm away from the base, and the protective pad has a pressure relief through hole corresponding to the explosion-proof diaphragm.

[0011] In any of the above technical solutions, the protective pad is further connected to the base and the explosion-proof diaphragm by adhesive.

[0012] In any of the above technical solutions, further, the explosion-proof diaphragm has grooves formed on it.

[0013] In any of the above technical solutions, the thickness of the explosion-proof diaphragm is t, and 0.3mm≤t≤1mm.

[0014] In any of the above technical solutions, the base further includes a first mounting portion, a second mounting portion, and a third mounting portion connected sequentially along the pressure relief direction of the soft-pack battery body, and the three portions form a tapered stepped structure along the direction away from the soft-pack battery body; the communication port is formed in the first mounting portion; the flow channel is formed in the first mounting portion, the second mounting portion, and the third mounting portion; and the pressure relief port is formed in the third mounting portion.

[0015] This application also provides an airtightness testing device for testing the airtightness of the soft-pack battery described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of the soft-pack battery, which will not be elaborated here.

[0016] In the above technical solution, the air tightness testing device further includes a first mounting component, a second mounting component, a sealing ring, a testing component, and a venting pipe; wherein the first mounting component and the second mounting component are detachably connected together; at least one of the first mounting component and the second mounting component forms a mounting groove for mounting the soft-pack battery;

[0017] At least one of the first mounting component and the second mounting component is provided with the sealing ring, the vent pipe and the detection component, and the sealing ring is arranged around the outer periphery of the groove opening of the mounting groove. One end of the vent pipe is connected to the mounting groove, and the other end of the vent pipe is used to connect to a gas source. The detection end of the detection component extends into the mounting groove.

[0018] This application also provides an airtightness testing device for encapsulating the soft-pack battery described in any of the above technical solutions. Therefore, it has all the beneficial technical effects of the soft-pack battery, which will not be elaborated here.

[0019] In any of the above technical solutions, the battery packaging device further includes a first end cap and a second end cap; wherein the first end cap and the second end cap are capable of pressing against the first packaging edge and the second packaging edge of the soft-pack battery body along its thickness direction, so that the first packaging edge and the second packaging edge are connected together, and the first end cap forms a first clearance groove that avoids one side of the base, and the second end cap forms a first clearance groove that avoids the other side of the base.

[0020] Compared with the prior art, the beneficial effects of this application are as follows:

[0021] The soft-pack battery provided in this application is equipped with a pressure relief structure. During use, when the soft-pack battery generates gas and reaches a certain pressure value due to overcharging or over-discharging, the explosion-proof diaphragm of the pressure relief structure will automatically break open to achieve the purpose of early pressure relief, thereby improving the safety and reliability of the soft-pack battery during use.

[0022] In addition, during the manufacturing process of pouch batteries, this pressure relief structure can be used to test the sealing performance of the entire pouch battery to prevent the risk of leakage caused by poor sealing. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a pouch battery provided in an embodiment of this application;

[0025] Figure 2 for Figure 1 A magnified structural diagram at point A;

[0026] Figure 3 A schematic diagram of the pressure relief structure provided in the embodiments of this application;

[0027] Figure 4 A cross-sectional view of the pressure relief structure provided in the embodiments of this application;

[0028] Figure 5 This is a schematic diagram of the structure of the airtightness testing device provided in the embodiments of this application;

[0029] Figure 6 This is a schematic diagram of the packaging device provided in an embodiment of this application.

[0030] Figure label:

[0031] 1-Pouch battery body, 101-Conducting port, 102-First encapsulation edge, 103-Second encapsulation edge, 2-Base, 21-First mounting part, 22-Second mounting part, 23-Third mounting part, 24-Connecting port, 25-Flow channel, 26-Pressure relief port, 3-Explosion-proof diaphragm, 4-Matching flat plate part, 5-Protective pad, 51-Pressure relief through hole, 10-Pouch battery, 20-First mounting component, 30-Second mounting component, 40-Sealing ring, 50-Detection component, 60-Ventilation pipe, 70-Mounting groove, 80-Sealing ring mounting groove, 90-First end cap, 901-First clearance groove, 100-Second end cap, 1001-Second clearance groove. Detailed Implementation

[0032] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this application, but not all embodiments.

[0033] The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application.

[0034] Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0035] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 application and simplifying the description, and do not 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 application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] The following reference Figures 1 to 6 This application describes a soft-pack battery, an airtightness testing device, and a packaging device according to some embodiments.

[0038] Example 1

[0039] See Figures 1 to 4 As shown, an embodiment of this application provides a soft-pack battery 10, including: a soft-pack battery body 1, a base 2, and an explosion-proof diaphragm 3; wherein, the base 2 forms a flow channel 25 and a communication port 24 and a pressure relief port 26 connected to the flow channel 25, and the soft-pack battery body 1 forms a conductive port 101 connected to its interior.

[0040] The base 2 is connected to the soft-pack battery body 1, and the flow channel 25 of the base 2 is connected to the interior of the soft-pack battery body 1 through the connecting port 24 and the conducting port 101. The explosion-proof membrane is installed on the base 2 and covers the pressure relief port 26. When the gas pressure inside the soft-pack battery body 1 is greater than the preset value, the gas can break through the explosion-proof membrane 3 and be released through the pressure relief port 26. It can be seen that the base 2 and the explosion-proof membrane 3 form a pressure relief structure.

[0041] As can be seen from the structure described above, the soft-pack battery 10 provided in this application is equipped with a pressure relief structure. When the soft-pack battery 10 generates gas and reaches a certain pressure value due to overcharging or over-discharging during use, the explosion-proof diaphragm 3 of the pressure relief structure will automatically break open to achieve the purpose of early pressure relief and improve the safety and reliability of the soft-pack battery 10 during use.

[0042] Furthermore, the process of performing an airtightness test on the entire pouch battery 10 before installing the aforementioned explosion-proof diaphragm 3 using the aforementioned pressure relief structure in conjunction with the airtightness testing device described below is roughly as follows: When manufacturing the pouch battery 10, the pouch battery 10 without the explosion-proof diaphragm 3 is placed in the mounting groove 70 of the first mounting component 20 and the second mounting component 30 in the airtightness testing device described below, and the pressure relief port 26 at the front end of the base 2 is aligned and connected with the vent pipe 60. Then, the first mounting component 20 and the second mounting component 30 are fastened and locked, and helium gas at a certain pressure is injected into the interior of the pouch battery 10 through the vent pipe 60 (it should be noted that: it is not limited to helium gas, other gases can also be injected, depending on actual needs). Under normal circumstances, the helium injection amount is 0.1Mpa-0.5Mpa. The amount of helium gas leakage in the cavity is detected by the detection component 50, thereby judging the sealing performance of the pouch battery 10. It is evident that during the manufacturing process of the pouch battery 10, the sealing performance of the entire pouch battery 10 can be tested through a pressure relief structure to prevent the risk of leakage caused by poor sealing.

[0043] It should be noted that when performing an airtightness test on the soft-pack battery 10 provided in this application, the airtightness test device described below may not be used. Other airtightness test devices may be used. For example, a sealed space may be set up, the soft-pack battery 10 may be placed in this space, and one end of the vent pipe may be extended into this space and connected to the pressure relief port 26. Then, air may be vented into the interior of the soft-pack battery 10. A test component may be provided, with one end of the test component inserted into this space, thereby completing the airtightness test.

[0044] In this embodiment, preferably, as follows: Figure 2As shown, the side of the soft-pack battery body 1 has a first encapsulation edge 102 and a second encapsulation edge 103 that are pressed together along the thickness direction of the soft-pack battery body 1. A through-hole 101 is formed between the root of the first encapsulation edge 102 and the root of the first encapsulation edge 102. The first encapsulation edge 102 covers one side of the base 2, and the second encapsulation edge 103 covers the opposite side of the base 2. At least the pressure relief port 26 of the base 2 is exposed to the first encapsulation edge 102 and the second encapsulation edge 103, so as not to affect the subsequent gas tightness test.

[0045] It should be noted that: the soft-pack battery cell body is generally an electrode assembly consisting of stacked positive and negative electrode sheets and a separator, covered with an encapsulation film such as an aluminum-plastic film (this will be used as an example later; of course, the material of the encapsulation film is not limited to this and can be selected according to actual needs). Finally, the aluminum-plastic film at the edges, namely the first encapsulation edge 102 and the second encapsulation edge 103 mentioned above, is pressed together, i.e., heat-fused. This part is existing technology and will not be described in detail here. According to the structure described above, the base 2 is directly encapsulated in the aluminum-plastic film, thereby fixing the base 2 and the aluminum-plastic film together, making the base 2 less likely to fall off, and the structure more reliable. Moreover, this operation can be completed during the encapsulation of the soft-pack battery 10 without any other additional operations, saving process steps.

[0046] In this embodiment, preferably, the base 2 is made of polypropylene and the encapsulation edge is the aforementioned aluminum-plastic film. This allows the base 2 and the encapsulation edge to be connected together by heat fusion sealing when encapsulating the aluminum-plastic film, making the base 2 more secure, more stable, and less prone to falling off.

[0047] Of course, the material of base 2 is not limited to this. Other materials that can be thermally bonded to aluminum-plastic film can also be selected. In addition, it should be noted that it is not limited to using aluminum-plastic film to encapsulate the electrode assembly. Other films can also be used for encapsulation, depending on the actual needs.

[0048] In this embodiment, preferably, as follows: Figure 2 and Figure 3 As shown, mating plate portions 4 are formed on both opposite sides of the base 2, and each mating plate portion 4 is pressed between the first encapsulation edge portion 102 and the second encapsulation edge portion 103.

[0049] As can be seen from the structure described above, mating plate portions 4 are provided on both sides of the base 2, thereby increasing the contact area between the base 2 and the first encapsulation edge 102 and the second encapsulation edge 103, making the two fit together more firmly and stably.

[0050] Furthermore, preferably, the flat plate portion 4 is arranged parallel to the large surface side of the soft-pack battery body 1.

[0051] Furthermore, preferably, the plate part 4 and the base 2 are an integral structure. Of course, it is not limited to this and can also be a separate structure, connected by adhesive or heat fusion.

[0052] In this embodiment, preferably, as follows: Figure 2 and Figure 3 As shown, the soft-pack battery 10 also includes a protective pad 5, which is pressed onto the side of the explosion-proof diaphragm 3 away from the base 2. The protective pad 5 has a pressure relief hole 51 corresponding to the explosion-proof diaphragm 3 to ensure normal pressure relief.

[0053] As can be seen from the structure described above, the protective pad 5 serves to press the explosion-proof diaphragm 3 tightly.

[0054] Furthermore, preferably, the protective pad 5 is connected to the base 2 and the explosion-proof diaphragm 3 by adhesive, which provides good fixation and is simple and convenient to operate. Of course, it is not limited to this. The protective pad 5 can also be made into a cap-shaped structure with a hollow interior and an open end, and it can be placed on the outside of the pressure relief port 26 of the base 2 and press down the explosion-proof diaphragm 3. Preferably, the protective pad 5 has a pressure relief hole corresponding to the pressure relief port 26. Of course, the above is only one example, and other structures can also be used, depending on the actual needs.

[0055] In this embodiment, preferably, the explosion-proof diaphragm 3 has grooves formed on it.

[0056] As can be seen from the structure described above, if the soft-pack battery 10 requires a higher pressure relief, grooves can be provided on the explosion-proof diaphragm 3, and the pressure relief can be controlled by varying the groove depth. Of course, this is not the only option; grooves may not be provided on the explosion-proof diaphragm 3, depending on the specific needs.

[0057] Furthermore, preferably, the aforementioned grooves can be set into C-shapes or O-shapes, depending on the actual needs.

[0058] In this embodiment, preferably, the thickness of the explosion-proof diaphragm 3 is t, and 0.3mm≤t≤1mm, which meets the basic usage requirements. Of course, it is not limited to this. The thickness of the explosion-proof diaphragm 3 can also be less than 0.3mm or greater than 1mm. For example, if the soft-pack battery 10 requires a low pressure relief, the explosion-proof diaphragm 3 can be of μm thickness. No grooves need to be designed on the explosion-proof diaphragm 3. After the air pressure of the soft-pack battery 10 reaches the design value, the explosion-proof diaphragm 3 is subjected to the limit of the air pressure it can bear, thereby breaking or depressurizing. The specific choice depends on the actual needs.

[0059] In this embodiment, preferably, as follows: Figure 3As shown, the base 2 includes a first mounting portion 21, a second mounting portion 22, and a third mounting portion 23 connected sequentially along the pressure relief direction of the soft-pack battery body 1, and the three form a tapered stepped structure along the direction away from the soft-pack battery body 1; a connecting port 24 is formed in the first mounting portion 21; a flow channel 25 is formed in the first mounting portion 21, the second mounting portion 22, and the third mounting portion 23; and a pressure relief port 26 is formed in the third mounting portion 23.

[0060] As can be seen from the structure described above, the first mounting part 21, as the body that cooperates with the first encapsulation edge 102 and the second encapsulation edge 103, has a sufficiently large contact area to ensure the stability and firmness after encapsulation; the second mounting part 22 and the third mounting part 23 extend outward in a direction away from the soft-pack battery body 1, which facilitates cooperation with the venting pipe 60 during the gas tightness test. Moreover, this stepped structure, while meeting the above requirements, occupies little space and helps to save materials.

[0061] Example 2

[0062] See Figure 5 As shown, Embodiment 2 of this application also provides an airtightness testing device for performing airtightness testing on the soft-pack battery 10 described in Embodiment 1 before installing the explosion-proof diaphragm 3. Therefore, it has all the beneficial technical effects of the soft-pack battery 10, and the same technical features and beneficial effects will not be repeated.

[0063] In this embodiment, preferably, as follows: Figure 5 As shown, the air tightness testing device includes a first mounting component 20, a second mounting component 30, a sealing ring 40, a testing component 50, and a venting pipe 60; wherein the first mounting component 20 and the second mounting component 30 are detachably connected together; at least one of the first mounting component 20 and the second mounting component 30 forms a mounting groove 70 for mounting a soft-pack battery 10.

[0064] At least one of the first mounting component 20 and the second mounting component 30 is provided with a sealing ring 40, a vent pipe 60 and a detection component 50, and the sealing ring 40 is arranged around the outer periphery of the groove opening of the mounting groove 70. One end of the vent pipe 60 is connected to the mounting groove 70, and the other end of the vent pipe 60 is used to connect to a gas source. The detection end of the detection component 50 extends into the mounting groove 70.

[0065] Based on the structure described above, the process of performing an airtightness test on the entire pouch battery 10 before installing the aforementioned explosion-proof diaphragm 3 using an airtightness testing device is roughly as follows: When manufacturing the pouch battery 10, the pouch battery 10 without the explosion-proof diaphragm 3 is placed in the mounting groove 70 of the first mounting component 20 and the second mounting component 30 in the airtightness testing device described below, and the pressure relief port 26 at the front end of the base 2 is aligned and connected with the vent pipe 60. Then, the first mounting component 20 and the second mounting component 30 are fastened and locked, and helium gas at a certain pressure is injected into the interior of the pouch battery 10 through the vent pipe 60. Under normal circumstances, the helium injection amount is 0.1 MPa to 0.5 MPa. The amount of helium leakage in the cavity is detected by the detection component 50, thereby judging the sealing performance of the pouch battery 10.

[0066] It is evident that during the manufacturing process of the pouch battery 10, this pressure relief structure can be used to test the sealing performance of the entire pouch battery 10, thereby preventing the risk of leakage caused by poor sealing.

[0067] Furthermore, preferably, mounting grooves 70 are formed on the adjacent sides of both the first mounting member 20 and the second mounting member 30, and these mounting grooves 70 have openings. Along the thickness direction of the pouch battery 10, a portion of the pouch battery 10 is installed in the mounting groove 70 of the first mounting member 20, and another portion of the pouch battery 10 is installed in the mounting groove 70 of the second mounting member 30. Of course, this is not a limitation; mounting grooves 70 may be formed only on the first mounting member 20 or only on the second mounting member 30, depending on the actual needs.

[0068] Furthermore, preferably, the first mounting member 20 is provided with a sealing ring mounting groove 80, and the sealing ring 40 can be installed in this sealing ring mounting groove 80, making the sealing ring 40 more stable. Of course, it is not limited to this. The sealing ring mounting groove 80 can be provided only on the second mounting member 30, or the sealing ring mounting groove 80 can be provided on both the first mounting member 20 and the second mounting member 30. A part of the sealing ring 40 is installed in the sealing ring mounting groove 80 on the first mounting member 20, and the other part of the sealing ring 40 is installed in the sealing ring mounting groove 80 on the second mounting member 30. The specific choice depends on the actual needs.

[0069] Furthermore, preferably, the vent fitting 60 is mounted on the first mounting member 20. Of course, it is not limited to this and can also be mounted on the second mounting member 30.

[0070] Furthermore, preferably, the first mounting component 20 is a cuboid structure, and the second mounting component 30 is a cuboid structure.

[0071] Furthermore, preferably, the detection component 50 can be a helium leak rate detector, etc. Of course, it is not limited to this and can be selected according to actual needs.

[0072] Example 3

[0073] See Figure 6 As shown, Embodiment 2 of this application also provides a battery packaging device for packaging the soft-pack battery 10 described in Embodiment 1 above. Therefore, it has all the beneficial technical effects of the soft-pack battery 10. The same technical features and beneficial effects will not be repeated here.

[0074] In this embodiment, preferably, as follows: Figure 6 As shown, the battery packaging device includes a first end cap 90 and a second end cap 100; wherein the first end cap 90 and the second end cap 100 can be pressed against the first packaging edge 102 and the second packaging edge 103 along the thickness direction of the soft-pack battery body 1, so that the first packaging edge 102 and the second packaging edge 103 are connected together, and the first end cap 90 forms a first clearance groove 901 that avoids one side of the base 2, and the second end cap 100 forms a second clearance groove 1001 that avoids the other side of the base 2.

[0075] As can be seen from the structure described above, the first end cap 90 and the second end cap 100 are heated, and then the first encapsulation edge 102 and the second encapsulation edge 103 are pressed together. At the same time, the base 2 is encapsulated between the two. The operation is simple and convenient, and saves assembly steps.

[0076] As can be seen, this application provides a first clearance groove 901 and a second clearance groove 1001 on the existing end cap, thereby avoiding the base 2 and allowing the base 2 to be encapsulated in the aluminum-plastic film, thus avoiding interference.

[0077] Furthermore, preferably, the cross-sections of the first end cap 90 and the second end cap 100 along their length direction are arranged in a convex shape, and the first end cap 90 and the second end cap 100 are arranged symmetrically.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A soft-pack battery, characterized in that, include: The package includes a soft-pack battery body, a base, and an explosion-proof diaphragm; wherein the base has a flow channel and a communication port and a pressure relief port connected to the flow channel, and the soft-pack battery body has a conductive port connected to its interior. The base is connected to the soft-pack battery body, and the flow channel of the base is connected to the interior of the soft-pack battery body through the connecting port and the conductive port. The explosion-proof membrane is installed on the base and covers the pressure relief port. When the gas pressure inside the soft-pack battery body is greater than a preset value, the gas can break through the explosion-proof membrane and be released through the pressure relief port.

2. The soft-pack battery according to claim 1, characterized in that, The side of the pouch battery body has a first encapsulation edge and a second encapsulation edge that are pressed together along the thickness direction of the pouch battery body. A through-hole is formed between the root of the first encapsulation edge and the root of the first encapsulation edge. The first encapsulation edge covers one side of the base, and the second encapsulation edge covers the opposite side of the base. At least the pressure relief port of the base is exposed to the first encapsulation edge and the second encapsulation edge.

3. The soft-pack battery according to claim 2, characterized in that, Both the first and second package edges are connected to the base via a heat-sealing process.

4. The soft-pack battery according to claim 3, characterized in that, The base is made of polypropylene, and the encapsulation edge is made of aluminum-plastic film.

5. The soft-pack battery according to claim 2, characterized in that, The base has mating plate portions formed on opposite sides, and each of the mating plate portions is pressed between the first encapsulation edge portion and the second encapsulation edge portion.

6. The soft-pack battery according to claim 1, characterized in that, The pouch battery also includes a protective pad, which is pressed onto the side of the explosion-proof diaphragm away from the base, and the protective pad has a pressure relief hole corresponding to the explosion-proof diaphragm.

7. The soft-pack battery according to claim 6, characterized in that, The protective pad is connected to the base and the explosion-proof diaphragm by adhesive.

8. The pouch cell battery according to any one of claims 1 to 7, characterized in that, The explosion-proof diaphragm has grooves formed on it; and / or The thickness of the explosion-proof diaphragm is t, and 0.3mm≤t≤1mm; and / or The base includes a first mounting portion, a second mounting portion, and a third mounting portion connected sequentially along the pressure relief direction of the soft-pack battery body, and the three portions form a tapered stepped structure along the direction away from the soft-pack battery body; the communication port is formed in the first mounting portion; the flow channel is formed in the first mounting portion, the second mounting portion, and the third mounting portion; the pressure relief port is formed in the third mounting portion.

9. A gas tightness testing device, characterized in that, For performing an airtightness test on the pouch battery as described in any one of claims 1 to 8 before installing the explosion-proof diaphragm, the airtightness test device includes a first mounting member, a second mounting member, a sealing ring, a test member, and a vent pipe; wherein the first mounting member and the second mounting member are detachably connected together; at least one of the first mounting member and the second mounting member forms a mounting groove and is used to install the pouch battery; At least one of the first mounting component and the second mounting component is provided with the sealing ring, the vent pipe and the detection component, and the sealing ring is arranged around the outer periphery of the groove opening of the mounting groove. One end of the vent pipe is connected to the mounting groove, and the other end of the vent pipe is used to connect to a gas source. The detection end of the detection component extends into the mounting groove.

10. A battery packaging device, characterized in that, For encapsulating the pouch battery as described in claim 2, the battery encapsulation device includes a first end cap and a second end cap; wherein the first end cap and the second end cap are capable of pressing against a first encapsulation edge and a second encapsulation edge along the thickness direction of the pouch battery body, so that the first encapsulation edge and the second encapsulation edge are connected together, and the first end cap forms a first clearance groove that avoids one side of the base, and the second end cap forms a second clearance groove that avoids the other side of the base.

Images