A liquid-blocking component and a soft-pack lithium-ion battery

Abstract

This application relates to a liquid-blocking device and a soft-pack lithium-ion battery. The liquid-blocking device includes a support frame with a liquid storage chamber inside. The support frame has a first opening communicating with the liquid storage chamber and at least two venting ports. The central axis of the first opening is perpendicular to the central axes of each venting port, and the venting ports are located on the side of the support frame away from the first opening. Gas enters the liquid storage chamber through the first opening and is discharged from the venting ports in a direction perpendicular to the central axis of the first opening. By aligning the venting ports perpendicular to the axis of the first opening, the gas is forced to deflect and exit. The support frame blocks electrolyte from spraying out, preventing contamination of the secondary sealing area. Simultaneously, the liquid storage chamber prevents electrolyte leakage and stores gas generated during the use of the battery cell, improving the problem of bulging in the soft-pack battery cell and thus improving the battery cycle performance.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a liquid-blocking device and a soft-pack lithium-ion battery. Background Technology

[0002] Soft-pack lithium-ion batteries typically refer to lithium-ion batteries packaged in aluminum-plastic film. Compared to square aluminum-cased and cylindrical batteries, soft-pack lithium-ion batteries offer higher safety performance, higher energy density, and more flexible design, thus gradually expanding their market share in the consumer electronics and power battery sectors.

[0003] Because the outer packaging of pouch lithium-ion batteries is made of aluminum-plastic film, a heat-sealing method is used. This involves heating the aluminum-plastic film through the sealing head, melting and bonding the polypropylene inner layer, and then solidifying upon cooling to achieve the sealing effect. Pouch lithium-ion battery packaging can be categorized by location as top-sealed, side-sealed, single-sealed, and double-sealed (e.g.,...). Figure 1 (As shown). The top and side seals are completed before electrolyte injection; the first seal is completed after electrolyte injection; and the second seal is completed after formation, high-temperature settling, and venting. Because the vacuuming action during venting before the second seal causes free electrolyte to escape into the second-seal area, it can lead to poor sealing and affect battery performance. Summary of the Invention

[0004] This application provides a liquid-blocking component and a soft-pack lithium-ion battery to solve the problem in the related art where the vacuuming action during venting before the secondary sealing of a soft-pack lithium-ion battery causes free electrolyte to escape into the secondary sealing area, resulting in poor secondary sealing and affecting battery performance.

[0005] In a first aspect, a liquid-blocking component is provided, comprising: A support frame with a liquid storage chamber inside, and the support frame having a first opening communicating with the liquid storage chamber and at least two air extraction ports. Wherein, the central axis of the first opening is perpendicular to the central axis of each of the air extraction ports, and the air extraction ports are located on the support frame on the side away from the first opening; After the gas enters the liquid storage chamber through the first opening, it is discharged from the exhaust port in a direction perpendicular to the central axis of the first opening.

[0006] In some embodiments, the support frame includes a bottom wall and a side wall surrounding the edge of the bottom wall, the first opening is located on the opposite side of the bottom wall, and the air extraction port is opened in the side wall; The support frame is provided with multiple partition plates, which are spaced apart along the axis perpendicular to the liquid storage cavity and extend from the first opening toward the bottom wall. A preset gap is left between the partition plates and the bottom wall to allow airflow communication inside the liquid storage cavity.

[0007] In some embodiments, the at least two air extraction ports are respectively disposed on two oppositely arranged sidewalls.

[0008] In some embodiments, multiple partition plates divide the liquid storage chamber into multiple sub-liquid storage chambers; The ratio of the length of the support frame to the number of the sub-liquid storage chambers is 5 to 20.

[0009] In some embodiments, the gap between the partition plate closest to the air extraction port and the bottom wall is smaller than the gap between the other partition plates and the bottom wall.

[0010] In some embodiments, the support frame is provided with an elastic buffer, which is disposed at the first opening.

[0011] Secondly, a pouch lithium-ion battery is provided, comprising: Battery cell; An encapsulation film is provided with a buffer zone, which is disposed on one side of the battery cell. The liquid-blocking element is disposed within the buffer zone, and the encapsulation film encapsulates the battery cell and the liquid-blocking element.

[0012] In some embodiments, the height of the support frame of the liquid baffle is less than or equal to the thickness of the battery cell, and the length of the support frame is less than or equal to the length of the battery cell.

[0013] Thirdly, a packaging method for a soft-pack lithium-ion battery is provided, comprising the following steps: The battery cell and the liquid-blocking component are placed inside the encapsulation film, with the first opening of the liquid-blocking component facing the battery cell. After the pre-set top sealing area and side sealing area on the encapsulation film are encapsulated, liquid is injected. After the liquid injection is completed, the pre-set sealing area is encapsulated. After aging, the battery cell is placed vertically downwards, with the first opening facing the direction of gravity. The cavity formed by the encapsulation film and the battery cell is evacuated, and the preset second sealing area is encapsulated to complete the encapsulation of the lithium-ion battery.

[0014] In some embodiments, before placing the battery cell and the liquid-blocking element within the encapsulation film, the method further includes: A buffer zone is formed by punching indentations in the encapsulation film to house the liquid-blocking component.

[0015] This application provides a liquid-blocking component and a soft-pack lithium-ion battery. By setting the central axis of the vent to be perpendicular to the central axis of the first opening, the gas entering the liquid storage chamber from the first opening must be discharged from the vent in a direction perpendicular to the entry direction. During this process, the support frame can effectively prevent the electrolyte from being sprayed out directly with the gas, avoiding the electrolyte from entering the secondary sealing area and affecting the seal. At the same time, the support frame has a liquid storage chamber inside, and the vent is located on the side away from the first opening. When the gas carries a small amount of electrolyte into the chamber, the electrolyte can be retained and stored in the liquid storage chamber under the action of gravity, preventing the electrolyte from leaking out. This allows most of the electrolyte injected during the liquid injection process to be retained in the battery, thereby improving the battery cycle performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of lithium-ion battery packaging in the prior art; Figure 2 This is a schematic diagram of the liquid-blocking component structure provided in an embodiment of this application; Figure 3 This is a schematic diagram of the exploded structure of the liquid-blocking component provided in the embodiments of this application; Figure 4 This is a schematic diagram of the dimensions of the liquid-blocking component provided in an embodiment of this application; Figure 5 This is a schematic diagram of the structure of a soft-pack lithium-ion battery provided in an embodiment of this application.

[0018] In the diagram: a) Top sealing area; b) Side sealing area; c) First sealing area; d) Second sealing area; 1. Support frame; 101. Liquid storage chamber; 102. First opening; 103. Air extraction port; 104. Bottom wall; 105. Side wall; 2. Divider plate; 3. Battery cell; 4. Buffer zone; 5. Encapsulation film. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] This application provides a liquid-blocking component that can solve the problem in related technologies where the vacuuming action during the venting process before the secondary sealing of a soft-pack lithium-ion battery causes free electrolyte to escape into the secondary sealing area, resulting in poor secondary sealing and affecting battery performance.

[0021] Firstly, a liquid-blocking component is provided. Figures 2 to 3 As shown, it includes: The support frame 1 has a liquid storage chamber 101 inside, and the support frame 1 has a first opening 102 that communicates with the liquid storage chamber 101 and at least two air extraction ports 103. The central axis of the first opening 102 is perpendicular to the central axis of each air extraction port 103. The air extraction port 103 is located on the support frame 1 on the side away from the first opening 102, that is, the air extraction port 103 is a certain distance away from the first opening 102, so that the area below the air extraction port 103 can store electrolyte. After the gas enters the liquid storage chamber 101 through the first opening 102, it is discharged from the exhaust port 103 in a direction perpendicular to the central axis of the first opening 102.

[0022] Compared to placing the evacuation port 103 on the opposite side of the first opening 102, in the process of vacuuming, the evacuation port 103 and the first opening 102 form convection, which makes it easy to extract the electrolyte during vacuuming, affecting the sealing effect of the second sealing zone. This application sets the central axis of the vent 103 perpendicular to the central axis of the first opening 102, so that after the gas enters the liquid storage chamber 101 from the first opening 102, it must be discharged from the vent in a direction perpendicular to the entry direction. During this process, the support frame 1 can effectively prevent the electrolyte from being sprayed out directly with the gas, avoiding the electrolyte from entering the secondary sealing area and affecting the seal. At the same time, the support frame 1 has a liquid storage chamber 101 inside, and the vent 103 is set on the side away from the first opening 102, so that the vent 103 is a certain distance away from the first opening 102. When the gas carries a small amount of electrolyte into the chamber, the electrolyte can be retained and stored in the liquid storage chamber under the action of gravity, preventing the electrolyte from leaking out. This allows most of the electrolyte injected in the liquid injection process to be retained in the battery. In addition, the extra space can be used to store the gas generated during the use of the cell 3, improving the problem of soft-pack cell swelling, thereby improving the battery cycle performance.

[0023] In some embodiments, such as Figure 2 and Figure 3 As shown, the support frame 1 includes a bottom wall 104 and side walls 105 surrounding the edge of the bottom wall 104. A first opening 102 is located on the opposite side of the bottom wall 104, and a suction port 103 is opened on the side wall 105, with the suction port 103 a certain distance from the first opening 102, i.e., the suction port 103 is located in the upper part of the support frame 1. Thus, during vacuuming, the gas carrying the electrolyte moves towards the suction port 103, is blocked by the bottom wall 104, and accumulates in the liquid storage chamber 101.

[0024] In some embodiments, the support frame 1 is made of a corrosion-resistant material, such as polypropylene, high-density polyethylene, polyphenylene sulfide, acrylonitrile-butadiene-styrene copolymer, etc.

[0025] In some embodiments, such as Figure 3 As shown, the support frame 1 consists of two parts: one part is used to store the electrolyte, and the other part is used to block the electrolyte. They can be set up as a whole to improve the overall sealing and structural strength of the support frame 1 and avoid squeezing the support frame 1 during the vacuuming process.

[0026] In some embodiments, the support frame 1 is rectangular, with the longer side of the rectangle being the length direction of the battery cell 3, and the height direction of the support frame 1 being parallel to the height direction of the battery cell 3. The cross-section of the support frame 1 is square, which maximizes the use of the space in the soft-pack battery encapsulation film buffer zone, increases the volume ratio of the liquid storage chamber, and at the same time, the rectangular structure is easy to mold and form.

[0027] In some embodiments, the bottom wall 104 is arc-shaped, that is, the cross-section of the support frame 1 is U-shaped. This is more conducive to the electrolyte gathering at the lowest point of the bottom wall, avoiding the electrolyte stagnation at right-angle corners. At the same time, the arc-shaped bottom wall 104 can disperse external pressure, improve the compressive strength of the support frame 1, and prevent deformation or breakage due to concentrated force during vacuuming or transportation.

[0028] In some embodiments, the support frame 1 is provided with multiple partition plates 2, which are spaced apart along a direction perpendicular to the axis 101 of the electrolyte storage chamber, i.e., spaced apart along the length of the battery cell 3, and extend from the first opening 102 toward the bottom wall 104. A preset gap is left between the partition plates 2 and the bottom wall 104 to allow airflow communication inside the electrolyte storage chamber 101. The partition plates 2 in the support frame 1 divide the electrolyte storage chamber 101 into multiple sub-chambers, increasing the stability of electrolyte storage and preventing excessive electrolyte sloshing during the injection process. Multiple partition plates 2 are spaced apart along the direction perpendicular to the axis of the liquid storage chamber 101, forming a labyrinthine airflow channel. This significantly extends the flow path of the gas in the liquid storage chamber 101 and increases the airflow resistance, allowing the electrolyte droplets carried in the gas more time to settle to the bottom wall due to gravity or to collide with the surface of the partition plate 2 and condense and flow back. The partition plate 2 extends from the first opening 102 toward the bottom wall 104 and leaves a preset gap with the bottom wall 104, which not only ensures the internal airflow communication but also forms a physical barrier, effectively preventing the electrolyte from rushing directly from the first opening 102 to the exhaust port 103 with the airflow.

[0029] In some embodiments, such as Figure 4As shown, considering that the support frame 1 needs to withstand the pressure during the vacuuming process and also has the dual functions of airflow guidance and electrolyte storage, multiple partition plates 2 divide the liquid storage chamber 101 into multiple sub-liquid storage chambers. The ratio L / N between the total length L of the support frame 1 along its length direction (in mm) and the number of sub-liquid storage chambers N is set to 5~20, and the wall thickness T of the support frame 1 is 0.2~1mm.

[0030] By appropriately configuring the L / N ratio, the dimensions of each sub-cell in the length direction can be effectively controlled. If the ratio is too small, i.e., too many sub-cells or too short a length, the volume of each sub-cell will be insufficient, limiting the electrolyte storage space and significantly increasing airflow resistance, thus affecting exhaust efficiency. If the ratio is too large, i.e., too few sub-cells or too long a length, the support strength will be insufficient, the labyrinthine airflow path will be shortened, the liquid-blocking effect will decrease, and the electrolyte will be easily carried directly to the extraction port 103 by the airflow. Therefore, controlling the L / N ratio within the range of 5 to 20 can maintain good airflow distribution and electrolyte interception capability while ensuring support strength, ensuring that the electrolyte does not easily leak out during vacuuming.

[0031] In some embodiments, the partition plates 2 are evenly spaced. The even spacing makes the airflow resistance distribution in the liquid storage cavity consistent, which is conducive to the smooth flow of gas and avoids the local airflow speed being too fast, which would cause the settled electrolyte to be rolled up and carried out again. At the same time, it facilitates the standardized design and mass production of the mold.

[0032] In some embodiments, the partition plates 2 may also be unevenly spaced. The uneven arrangement can be optimized according to the distribution of airflow speed and liquid content. For example, the partition plates 2 can be densified near the air extraction port 103 to enhance the final liquid blocking effect.

[0033] In some embodiments, two exhaust ports 103 are respectively disposed on two oppositely arranged side walls 105. The oppositely arranged exhaust ports 103 enable the gas in the liquid storage chamber 101 to be discharged evenly from both sides, avoiding airflow deflection caused by unilateral exhaust, and improving the stability and efficiency of the exhaust process.

[0034] In some embodiments, multiple exhaust ports 103 can be provided, not only on two opposite sidewalls 105, but also on adjacent sidewalls, not just on the side opposite to the first opening 102. Multiple exhaust ports increase the total exhaust area, reduce exhaust resistance, and improve vacuuming efficiency.

[0035] In some embodiments, two vents 103 are provided, each located on one of two oppositely arranged sidewalls 105. The gap between the partition plate 2 closest to the vent 103 and the bottom wall 104 is smaller than the gaps between the other partition plates 2 and the bottom wall 104. This forms a final-stage fine liquid-blocking structure, further intercepting droplets that may break through the preceding barriers, ensuring that the electrolyte is effectively retained in the storage chamber and preventing it from being extracted and contaminating external equipment or causing electrolyte loss.

[0036] In some embodiments, the support frame 1 is provided with an elastic buffer, which is located at the first opening 102. The elastic buffer is an elastic sealing ring that matches the shape and size of the first opening 102, for example, made of corrosion-resistant perfluoroether rubber. The elastic buffer at the first opening 102 can form a flexible contact between the liquid-blocking component and the battery cell 3, preventing the rigid support frame 1 from scratching the battery cell 3, while absorbing vibration impact and protecting the internal structure of the battery cell 3.

[0037] In some embodiments, an elastic buffer layer is provided around the support frame 1 to form a flexible contact between the liquid blocking component and the encapsulation film 5, thereby preventing the rigid support frame 1 from scratching the encapsulation film 5.

[0038] Secondly, a pouch lithium-ion battery is provided, comprising: Cell 3; The encapsulation film 5 has a buffer zone 4, which is located on one side of the battery cell 3. A liquid-blocking component is provided in the buffer zone 4, with the first opening 102 of the liquid-blocking component facing the battery cell 3. The encapsulation film 5 is used to encapsulate the battery cell 3 and the liquid-blocking component.

[0039] By setting a buffer zone on the encapsulation film 5, and setting a liquid-blocking component in the buffer zone, with the first opening 102 of the liquid-blocking component facing the cell 3, the electrolyte can be effectively stored and blocked, preventing the electrolyte from overflowing to the edge of the encapsulation with the airflow during the liquid injection, formation or vacuuming process, and avoiding electrolyte contamination of the secondary sealing area, thereby affecting the sealing performance.

[0040] In some embodiments, such as Figure 4 As shown, the height of the support frame 1 for the liquid-blocking component is less than or equal to the thickness of the battery cell 3, and the length of the support frame 1 is less than or equal to the length of the battery cell 3. The height H of the support frame 1 does not exceed the thickness of the battery cell body and is not less than 2mm, and the length L is 1 / 2 to 1 times the length of the second sealing area. The height and length of the support frame 1 being less than or equal to the height and length of the battery cell 3 can prevent the liquid-blocking component from exceeding the edge of the battery cell, which would cause uneven stress or wrinkles in the encapsulation film 5 during the heat sealing process. It also prevents the risk of gaps or leakage at the sealing edge due to the protrusion of the liquid-blocking component, while ensuring the flatness of the overall appearance of the battery, facilitating the stacking arrangement during subsequent module assembly, and improving the yield and safety of battery production.

[0041] Thirdly, a packaging method for a soft-pack lithium-ion battery is provided, comprising the following steps: S100: A buffer zone 4 is formed by punching a hole in the encapsulation film 5 to place the liquid blocking component.

[0042] like Figure 5 As shown, based on the volume of the battery cell 3, a first sealing area, a second sealing area, a top sealing area, and a side sealing area are pre-defined on the encapsulation film. Simultaneously, a placement area for the battery cell 3 and a buffer zone next to the placement area are also pre-defined. During the punching process, the depth of the punching is matched to the height of the support frame 1, and the area of ​​the punching is slightly larger than the projected area of ​​the support frame 1. This ensures that the support frame 1 can be completely contained within the buffer zone 4, preventing the support frame 1 from protruding from the surface of the encapsulation film 5, which could lead to uneven sealing force or wrinkles during subsequent encapsulation. It also prevents the support frame 1 from squeezing the battery cell 3 and causing damage, ensuring the flatness of the battery's appearance and the safety of its internal structure.

[0043] S200: Place the battery cell 3 and the liquid-blocking component inside the encapsulation film 5, with the first opening 102 of the liquid-blocking component facing the battery cell 3.

[0044] When the battery cell 3 and the liquid-blocking component are placed inside the encapsulation film 5, the support frame 1 is located in the buffer zone 4, and the edge of the support frame 1 does not extend beyond the edge of the battery cell 3. The elastic buffer component provided at the first opening 102 abuts against the surface of the battery cell 3, forming a flexible sealing contact. This prevents electrolyte from leaking directly from the gap between the first opening 102 and the battery cell 3 to the edge of the encapsulation film 5, and also avoids the rigid support frame 1 from wearing down the encapsulation layer of the battery cell 3 during battery expansion or vibration, thereby improving the cycle life and safety of the battery.

[0045] S300: After sealing the preset top sealing area and side sealing area on the encapsulation film 5, liquid is injected. After the liquid injection is completed, the sealing area is sealed.

[0046] After the pre-designed top and side sealing areas are encapsulated, electrolyte is injected. Once injection is complete, the sealing area is then sealed. During injection, the electrolyte not only wets the battery cell 3 but also flows into the storage chamber 101 of the support frame 1. The partition plate 2 within the support frame 1 divides the storage chamber 101 into multiple sub-chambers, increasing the stability of electrolyte storage and preventing excessive electrolyte sloshing during injection. The sealing area typically refers to the sealing of the injection port, ensuring the battery remains sealed during aging and preventing external moisture from entering.

[0047] S400: After aging, place the cell 3 in a vertical position with the first opening 102 facing the direction of gravity, evacuate the encapsulation film 5, and encapsulate the second sealing area to complete the encapsulation of the lithium-ion battery.

[0048] After aging, the battery cell 3 is placed vertically downwards, with the first opening 102 facing the direction of gravity. A vacuum is then applied to the encapsulation film 5 to seal the secondary sealing area. During the vacuuming and degassing process, the gas generated inside the battery flows upwards, while the electrolyte sinks downwards under gravity and remains in the storage chamber 101 within the support frame 1. Combined with the labyrinth-style partition plate 2 structure inside the support frame 1, this effectively prevents the electrolyte from moving upwards with the airflow to the extraction port 103, significantly reducing the risk of electrolyte extraction and ensuring the dryness and cleanliness of the secondary sealing area's edges, thus avoiding seal failure due to electrolyte contamination of the sealing edges.

[0049] After the second sealing area is completed, the excess edge of the sealing film is removed, and the resulting soft-pack lithium-ion battery has a higher electrolyte retention and more reliable sealing performance, making it suitable for the production of high energy density batteries.

[0050] The packaging method for soft-pack lithium-ion batteries provided in this application is fully compatible with existing processes. It only requires adding a buffer zone 4 in the aluminum-plastic film punching process to house the hollow support frame 1. By setting a buffer zone between the aluminum-plastic film cell 3 body and the secondary sealing area, and placing a hollow support frame 1 in the buffer zone, electrolyte overflowing from the cell 3 body can be stored and shielded during vacuuming. Simultaneously, the extra space can be used to store gases generated during cell 3 use, improving the problem of soft-pack cell bulging and solving the problem of poor sealing caused by electrolyte residue in the secondary sealing area.

[0051] In the description of this application, it should be noted that the terms "upper," "lower," 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 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, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" 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; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0052] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0053] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A liquid-blocking component, characterized in that, include: The support frame (1) has a liquid storage chamber (101) inside. The support frame (1) has a first opening (102) connected to the liquid storage chamber (101) and at least two air extraction ports (103). Wherein, the central axis of the first opening (102) is perpendicular to the central axis of each of the air extraction ports (103), and the air extraction ports (103) are disposed on the support frame (1) on the side away from the first opening (102); After the gas enters the liquid storage chamber (101) through the first opening (102), it is discharged from the air extraction port (103) in a direction perpendicular to the central axis of the first opening (102).

2. The liquid-blocking component as described in claim 1, characterized in that, The support frame (1) includes a bottom wall (104) and a side wall (105) surrounding the edge of the bottom wall (104). The first opening (102) is located on the opposite side of the bottom wall (104), and the air extraction port (103) is opened on the side wall (105). The support frame (1) is provided with a plurality of partition plates (2). The plurality of partition plates (2) are spaced apart along the axis perpendicular to the liquid storage cavity (101) and extend from the first opening (102) toward the bottom wall (104). A preset gap is left between the partition plates (2) and the bottom wall (104) so ​​that the airflow inside the liquid storage cavity (101) can be connected.

3. The liquid-blocking component as described in claim 2, characterized in that, The at least two air extraction ports (103) are respectively disposed on two oppositely arranged side walls (105).

4. The liquid-blocking component as described in claim 2, characterized in that, The multiple partition plates (2) divide the liquid storage chamber (101) into multiple sub-liquid storage chambers; The ratio of the length of the support frame (1) to the number of the sub-liquid storage chambers is 5 to 20.

5. The liquid-blocking component as described in claim 3, characterized in that, The gap between the partition plate (2) closest to the air extraction port (103) and the bottom wall (104) is smaller than the gap between the other partition plates (2) and the bottom wall (104).

6. The liquid-blocking component as described in claim 1, characterized in that, The support frame (1) is provided with an elastic buffer, which is located at the first opening (102).

7. A soft-pack lithium-ion battery, characterized in that, include: Battery cell (3); The encapsulation film (5) has a buffer zone (4) disposed on one side of the battery cell (3), and a liquid-blocking element as described in any one of claims 1 to 6 is disposed in the buffer zone (4), and the encapsulation film (5) encapsulates the battery cell (3) and the liquid-blocking element.

8. The soft-pack lithium-ion battery as described in claim 7, characterized in that, The height of the support frame (1) of the liquid baffle is less than or equal to the thickness of the battery cell (3), and the length of the support frame (1) is less than or equal to the length of the battery cell (3).

9. A packaging method for a soft-pack lithium-ion battery, characterized in that, Includes the following steps: The battery cell (3) and the liquid-blocking member as described in any one of claims 1 to 6 are placed inside the encapsulation film (5), and the first opening (102) of the liquid-blocking member faces the battery cell (3). After the top sealing area and side sealing area on the encapsulation film (5) are sealed, liquid is injected. After the liquid injection is completed, the preset sealing area is sealed. After aging, the cell (3) is placed in a vertical position with the first opening (102) facing the direction of gravity. The cavity formed by the encapsulation film (5) and the cell is evacuated, and the preset second sealing area is encapsulated to complete the encapsulation of the lithium-ion battery.

10. The packaging method for a soft-pack lithium-ion battery as described in claim 9, characterized in that, Before placing the battery cell (3) and the liquid-blocking element inside the encapsulation film (5), the method further includes: A buffer zone (4) is formed by punching a hole in the encapsulation film (5) to hold the liquid-blocking component.

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