A soft-pack battery

Abstract

The utility model relates to soft package battery technical field, especially a kind of soft package battery. The soft package battery includes electric core and the packaging shell of surrounding electric core, at least one gas-permeable area is provided on packaging shell, waterproof gas-permeable membrane is provided on gas-permeable area, adsorbent is provided on waterproof gas-permeable membrane, adsorbent surrounds the one side of waterproof gas-permeable membrane away from gas-permeable area and forms adsorption cavity or adsorbent inside is provided with the adsorption cavity isolated with the inner wall of waterproof gas-permeable membrane by adsorbent, adsorption material is arranged in adsorption cavity, the projection area of adsorption cavity on the plane of gas-permeable area is greater than the area of gas-permeable area. By the joint action of waterproof gas-permeable membrane and adsorbent, the gas generated in the process of electric core operation can be actively and continuously adsorbed, the battery expansion is effectively delayed, the edge breakage and electrolyte leakage are prevented, and the gas trapping efficiency is improved, so that the safety hazard caused by electrolyte leakage is more effectively inhibited.

Description

Technical Field

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

[0002] During operation, existing pouch batteries are prone to generating gas due to electrolyte decomposition, side reactions, and overcharging. This gas can cause cell expansion and increased internal pressure, potentially leading to seal rupture or electrolyte leakage in severe cases. To mitigate these issues, some existing technologies incorporate a one-way valve in the battery casing for venting. However, these valves often pose safety hazards due to insufficient gas capture efficiency or inability to effectively suppress electrolyte leakage. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a soft-pack battery.

[0004] The present invention provides a soft-pack battery, comprising a battery cell and a casing surrounding the battery cell. The casing has at least one ventilated area, a waterproof and breathable membrane is disposed on the ventilated area, and an adsorbent is disposed on the waterproof and breathable membrane. The adsorbent surrounds the side of the waterproof and breathable membrane away from the ventilated area and forms an adsorption cavity accordingly, or an adsorption cavity is disposed inside the adsorbent. The adsorption cavity is isolated from the waterproof and breathable membrane by the inner wall of the adsorbent. Adsorbent material is disposed inside the adsorption cavity, and the projected area of ​​the adsorption cavity on the plane of the ventilated area is larger than the area of ​​the ventilated area.

[0005] Preferably, when the adsorbent surrounds the side of the waterproof and breathable membrane away from the breathable area to form an adsorption cavity, the flow-guiding support layer is placed on the outer layer of the adsorbent; or when the adsorbent is provided inside the adsorbent, the waterproof and breathable membrane extends from the side covering the breathable area to the side away from the breathable area to cover the entire adsorbent, and the flow-guiding support layer is sandwiched between the waterproof and breathable membrane and the adsorbent.

[0006] Preferably, the flow-guiding support layer is one of a metal microporous support sheet or a polymer support mesh.

[0007] Preferably, the breathable zone includes a single air vent or the breathable zone includes a plurality of air vents arranged in a preset pattern, wherein the cross-sectional area of ​​the air vent is larger than the cross-sectional area of ​​the air vent.

[0008] Preferably, the adsorbent material includes any one of composite adsorbent material and porous activated carbon, wherein the composite adsorbent material is obtained by combining porous activated carbon with molecular sieve; and / or the waterproof and breathable membrane includes any one of ePTFE membrane, PVDF membrane and PU membrane.

[0009] Preferably, the adsorbent is an air-permeable but powder-impermeable inner bag or a prefabricated modular adsorbent bag, wherein the prefabricated modular adsorbent bag is lined with a powder-proof layer.

[0010] Preferably, a one-way vent valve is provided on the side of the waterproof and breathable membrane that avoids covering the breathable area.

[0011] Preferably, the waterproof and breathable membrane, the adsorbent, the adsorbent material, and the flow-guiding support layer covering the adsorbent are prefabricated to form a gas adsorption module. The soft-pack battery includes at least two gas adsorption modules, and at least one of the gas adsorption modules covers all the breathable areas.

[0012] Preferably, the soft-pack battery includes a plurality of adsorbents with adsorption cavities inside, and the waterproof and breathable membrane covers all the breathable areas and at least covers the adsorbents corresponding to the breathable areas.

[0013] Preferably, a gas guiding channel is provided between any two adjacent gas adsorption modules or any two adjacent adsorption chambers for gas transmission.

[0014] Compared with the prior art, the soft-pack battery provided by this utility model has the following beneficial effects: 1. This utility model provides a soft-pack battery, including a battery cell and a casing surrounding the battery cell. A waterproof and breathable membrane and an adsorbent are sequentially arranged on one side of the casing where a ventilated area is located. The adsorbent surrounds the waterproof and breathable membrane, forming an adsorption cavity on the side facing away from the ventilated area. Alternatively, the adsorbent may have an adsorption cavity isolated from the waterproof and breathable membrane by its inner wall. The projected area of ​​the adsorption cavity on the plane of the ventilated area is larger than the area of ​​the ventilated area. This allows the gas generated during battery cell use to pass sequentially through the ventilated area and the waterproof and breathable membrane before directly entering the adsorption cavity, where it is adsorbed by the adsorbent material. When the adsorbent material in the adsorption cavity... After the material captures the gas, it generates and maintains a negative pressure environment within the cavity. This negative pressure creates a suction effect on the inside of the battery cell through the waterproof and breathable membrane, thereby actively and continuously suppressing the rise in internal pressure of the battery cell, rather than passively waiting for the pressure to accumulate to a threshold before releasing it. Compared to the existing connection between the battery cell cavity and the circulation cavity controlled by a one-way valve, this embodiment can actively and continuously adsorb the gas generated during battery cell use through the combined action of the waterproof and breathable membrane and the adsorbent. This can more effectively delay battery expansion, prevent edge rupture and electrolyte leakage, thereby improving gas capture efficiency and more effectively suppressing the safety hazards caused by electrolyte leakage.

[0015] 2. In this embodiment of the utility model, by setting a flow-guiding support layer, whether it is covered on the outer layer of the adsorbent body or sandwiched between the waterproof and breathable membrane and the adsorbent body, it can provide reliable mechanical support and protection for the entire gas adsorption structure without affecting the gas passing through the breathable membrane into the adsorption chamber in sequence, thereby ensuring the structural stability of the adsorption chamber and preventing the waterproof and breathable membrane and the adsorbent body from being squeezed and deformed during use.

[0016] 3. In this embodiment of the invention, a metal microporous support sheet or a polymer support mesh is used as the flow-guiding support layer, both of which can effectively maintain the unobstructed flow of gas channels and protect the waterproof and breathable membrane and the adsorbent from physical damage. Furthermore, using a metal microporous support sheet and a polymer support mesh as the flow-guiding support layer respectively can provide solutions with both high strength and good breathability for different application scenarios. This ensures mechanical support while also addressing the battery's differentiated needs for lightweighting, corrosion resistance, or high rigidity, thereby enhancing the product's adaptability and reliability in different usage environments.

[0017] 4. In this embodiment of the invention, when the venting zone is set as a single air vent, the relatively large diameter of the single air vent facilitates the rapid and concentrated passage of gas, simplifying the manufacturing process. Conversely, setting the venting zone as multiple arranged micropores disperses the flow rate of the electrolyte within the encapsulation shell, effectively blocking the impact of liquid on the waterproof and breathable membrane, thereby reducing the risk of localized liquid seepage and improving the reliability of the liquid-proof and breathable system composed of the venting zone and the waterproof and breathable membrane. Furthermore, by setting venting zones with different structural compositions, more options are available, allowing for flexible selection of the most suitable venting solution.

[0018] 5. In this embodiment of the invention, porous activated carbon or its composite with molecular sieves is used as the adsorption material, which allows for complementary advantages. Porous activated carbon has a broad-spectrum high adsorption capacity for organic gas molecules, while molecular sieves have a specific adsorption advantage for small polar molecules such as water molecules and carbon dioxide. The combined use of the two broadens the types of adsorbable gases and achieves more comprehensive capture of gases generated by the battery. At the same time, the selection of mature membrane materials such as ePTFE and PVDF ensures the long-term stability, high permeability, and reliable liquid barrier capability of the waterproof and breathable membrane under the battery chemical environment.

[0019] 6. In this embodiment of the invention, by using a breathable but powder-proof inner bag or a prefabricated modular adsorption bag as the adsorbent, the problems of migration and leakage of the adsorbent material are effectively solved. In addition, when using a prefabricated modular adsorption bag as the adsorbent, the powder-proof layer of the inner lining allows gas to enter freely, but firmly confines the adsorbent material inside the bag, preventing it from contaminating the battery cell or clogging the waterproof and breathable membrane.

[0020] 7. In this embodiment of the invention, a one-way vent valve is added to the waterproof and breathable membrane. When the amount of gas generated in the battery cell is continuously too high, causing the adsorption material in the adsorption chamber to become saturated and the adsorption efficiency to decrease, the pressure inside the chamber will increase accordingly. At this time, the one-way vent valve can open when a preset chamber pressure threshold is reached, directing the excess gas to the outside of the battery. This ensures that even after the adsorption capacity of the adsorption material reaches its upper limit, the safety of the overall structure can still be maintained through controllable pressure relief, preventing damage to the adsorption chamber due to internal pressure accumulation. This achieves a seamless connection from active adsorption to safe release, improving the overall robustness and safety limit of the gas management system.

[0021] 8. In this embodiment of the invention, the waterproof and breathable membrane, the adsorbent, the adsorbent material, and the flow-guiding support layer are pre-integrated into an independent gas adsorption module, and at least two gas adsorption modules are set to cover all breathable areas. This is more conducive to production and assembly. Simultaneously, the prefabricated gas adsorption module can undergo independent quality inspection to ensure its reliability before being installed into the battery, improving product consistency and yield. Furthermore, the independent gas adsorption module design allows for flexible adjustment of the number and arrangement of modules according to the battery's capacity, size, and gas generation characteristics. This enables efficient and comprehensive management of large-area or distributed gas generation areas, making it suitable for large-capacity or elongated batteries. This enhances the flexibility and scalability of the prefabricated gas adsorption module in the field of pouch batteries.

[0022] 9. In the embodiments of this utility model, by setting multiple adsorbents with internal adsorption cavities and using a single waterproof and breathable membrane to cover all breathable areas and corresponding adsorbents, the number of sealing connection points with the battery packaging shell is reduced, the assembly complexity in the sealing process is lowered, thereby reducing potential leakage risks and improving the sealing reliability of the entire system. Furthermore, for large-capacity or high-power batteries, the design of multiple adsorbents can provide a matching and more uniformly distributed large adsorption capacity, avoiding the local saturation problem that may occur with a single adsorption unit.

[0023] 10. In this embodiment of the utility model, by setting a gas guiding channel between adjacent gas adsorption modules or adsorption chambers, gas communication and pressure balance between each adsorption unit are realized. This can effectively promote the flow and redistribution of gas from high-pressure areas to low-pressure areas, thereby maximizing the utilization of the capacity of all adsorption materials, improving the efficiency and balance of the entire adsorption system, effectively preventing local pressure accumulation, and ensuring the overall consistency of internal pressure management of the battery. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of the soft-pack battery provided in the first embodiment of this utility model.

[0026] Figure 2 This is a schematic diagram of the current-guiding support layer of the soft-pack battery provided in the first embodiment of this utility model.

[0027] Figure 3 This is a schematic diagram of the air vent of the soft-pack battery provided in the first embodiment of this utility model.

[0028] Figure 4 This is a schematic diagram of the air-guiding micropores of the soft-pack battery provided in the first embodiment of this utility model.

[0029] Figure 5 This is a schematic diagram of the structure of the breathable but powder-proof inner bag of the soft-pack battery provided in the first embodiment of this utility model.

[0030] Figure 6 This is a schematic diagram of the structure of the prefabricated modular adsorption bag for the soft-pack battery provided in the first embodiment of this utility model.

[0031] Figure 7 This is a schematic diagram of the structure of multiple adsorbents of the soft-pack battery provided in the first embodiment of this utility model.

[0032] Figure 8 This is a schematic diagram of the pre-fabricated gas adsorption module of the soft-pack battery provided in the second embodiment of this utility model.

[0033] Figure 9 This is a schematic diagram of the structure of multiple pre-fabricated gas adsorption modules of the soft-pack battery provided in the second embodiment of this utility model.

[0034] Figure 10 This is a schematic diagram of the structure of the soft-pack battery provided in the third embodiment of this utility model.

[0035] Figure 11 This is a schematic diagram of the current-guiding support layer of the soft-pack battery provided in the third embodiment of this utility model.

[0036] Figure 12 This is a schematic diagram of the structure of multiple adsorbents of the soft-pack battery provided in the third embodiment of this utility model.

[0037] Figure 13 This is a schematic diagram of the pre-fabricated gas adsorption module of the soft-pack battery provided in the fourth embodiment of this utility model.

[0038] Figure 14 This is a schematic diagram of the structure of multiple pre-fabricated gas adsorption modules of the soft-pack battery provided in the fourth embodiment of this utility model.

[0039] Explanation of reference numerals in the attached diagram: 1. Soft-pack battery; 2. Soft-pack battery; 3. Soft-pack battery; 4. Soft-pack battery; 11. Battery cell; 12. Encapsulation shell; 13. Waterproof and breathable membrane; 14. Adsorbent; 15. Adsorption chamber; 16. Adsorbent material; 17. Airflow support layer; 19. Gas flow channel; 21. Battery cell; 22. Encapsulation shell; 23. Waterproof and breathable membrane; 24. Adsorbent; 25. Adsorption chamber; 26. Adsorbent material; 27. Airflow support layer; 28. Gas adsorption module; 29. ​​Gas flow channel; 31. Battery cell; 32. Encapsulation shell; 33. Waterproof and breathable membrane; 34. Adsorbent; 35. Adsorption chamber; 36. Adsorbent material; 37. Airflow support layer; 38. Gas adsorption module; 39. Gas flow channel; 41. Battery cell; 42. Encapsulation shell; 43. Waterproof and breathable membrane; 44. Adsorbent; 45. Adsorption chamber; 46. Adsorbent material; 47. Airflow support layer; 48. Gas adsorption module; 49. Gas flow channel; 121. Breathable area; 141. Breathable but powder-proof inner bag; 142. Prefabricated modular adsorption bag; 221. Breathable area; 321. Breathable area; 331. One-way ventilation valve; 341. Inner wall; 421. Breathable area; 1211, Air vent; 1212, Air vent micropores; 1421, Anti-powder layer. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0041] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0042] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0043] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0044] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0045] Please see Figure 1 The first embodiment of this utility model provides a soft-pack battery 1, which includes a battery cell 11 and a casing 12 surrounding the battery cell 11. The casing 12 is provided with at least one ventilated area 121. A waterproof and breathable membrane 13 is provided on the ventilated area 121. An adsorbent 14 is provided on the waterproof and breathable membrane 13. The adsorbent 14 surrounds the side of the waterproof and breathable membrane 13 away from the ventilated area 121 and forms an adsorption cavity 15. An adsorbent material 16 is provided in the adsorption cavity 15. The projected area of ​​the adsorption cavity 15 on the plane to which the ventilated area 121 belongs is larger than the area of ​​the ventilated area 121.

[0046] Specifically, the adsorbent 14 can form a semi-enclosed structure, resembling a concave structure, and the shape and area of ​​the waterproof and breathable membrane 13 can be adapted to the shape and area of ​​the opening of the adsorbent 14. When the shape and area of ​​the waterproof and breathable membrane 13 are the same as the shape and area of ​​the opening, the adsorbent 14 can enclose the waterproof and breathable membrane 13, so that the waterproof and breathable membrane 13 covers the opening of the adsorbent 14, thereby sealing the opening of the adsorbent 14, so that a sealed adsorption cavity 15 is formed between the adsorbent 14 and the waterproof and breathable membrane 13. That is, the adsorption cavity 15 is formed by the adsorbent 14 and the waterproof and breathable membrane 13 together as the boundary. The adsorption cavity 15 is specifically a cavity structure used to fill the adsorbent material 16, preventing solid and liquid substances from entering or leaving, and allowing gas to pass through.

[0047] Understandably, the waterproof and breathable membrane 13 is disposed on the breathable area 121, that is, on both sides of the waterproof and breathable membrane 13. One side covers the breathable area 121 and is in direct contact with the breathable area 121, while the other side seals the opening of the adsorbent 14 and can contact the adsorbent material 16 in the adsorption cavity 15. Moreover, the area of ​​the waterproof and breathable membrane 13 and the projected area of ​​the adsorption cavity 15 on the plane to which the breathable area 121 belongs are both larger than the area of ​​the breathable area 121, so that the waterproof and breathable membrane 13 can cover all the breathable areas 121, thereby preventing electrolyte from entering the encapsulation shell. Furthermore, the projected area of ​​the adsorption chamber 15 on the plane of the ventilated area 121 is larger than the area of ​​the ventilated area 121. This allows the gas generated during the use of the battery cell 11 to pass through the ventilated area 121 and the waterproof and breathable membrane 13 in sequence before directly entering the adsorption chamber 15. The gas is then adsorbed by the adsorbent material 16 within the adsorption chamber 15. Once the adsorbent material 16 captures the gas, it generates and maintains a negative pressure environment within the chamber. This negative pressure creates a suction effect on the inside of the battery cell 11 through the waterproof and breathable membrane 13, thereby actively and continuously suppressing the rise in internal pressure of the battery cell 11, rather than passively waiting for the pressure to accumulate to a threshold before releasing it. Compared to the existing connection between the battery cell 11 chamber and the circulation chamber controlled by a one-way valve, this embodiment, through the combined action of the waterproof and breathable membrane 13 and the adsorbent 14, can actively and continuously adsorb the gas generated during the use of the battery cell 11. This can more effectively delay battery expansion, prevent edge rupture and electrolyte leakage, thereby improving gas capture efficiency and more effectively suppressing the safety hazards caused by electrolyte leakage. In addition, by setting a waterproof and breathable membrane 13 to achieve gas transmission, the use of a complex dynamic valve body structure can be avoided, simplifying the gas transmission structure and eliminating the risk of valve jamming or failure due to aging or contamination. At the same time, the waterproof and breathable membrane 13 can achieve absolute isolation of the electrolyte and can make an immediate and continuous response to the slight changes in the internal pressure of the battery cell 11. This enables precise control of the battery cell 11, which is enclosed by the encapsulation shell 12, to only release gas and not liquid during operation, further improving safety and reliability.

[0048] Optionally, the area of ​​the waterproof and breathable membrane 13 can also be larger than the area of ​​the opening of the absorbent body 14, so that the waterproof and breathable membrane 13 can completely seal the opening and further ensure the avoidance effect.

[0049] Please see Figure 2 Furthermore, the soft-pack battery 1 also includes a flow-guiding support layer 17; when the adsorbent 14 surrounds the waterproof and breathable membrane 13 on the side away from the breathable area 121 to form an adsorption cavity 15, the flow-guiding support layer 17 covers the outer surface of the adsorbent 14, that is, the outer surface.

[0050] Specifically, based on the structure where the adsorbent 14 surrounds the waterproof and breathable membrane 13 to form the adsorption cavity 15, the flow-guiding support layer 17 is configured to completely cover the outer layer of the adsorbent 14, so that the flow-guiding support layer 17 tightly wraps around the outer surface of the adsorbent 14, forming a complete outer shell structure, so that the adsorbent 14 is completely contained within its internal space. This constitutes an innermost layer of waterproof and breathable membrane 13, a middle layer of adsorption cavity 15 formed by the adsorbent 14 surrounding the waterproof and breathable membrane 13, and an outermost layer of flow-guiding support layer 17. The flow-guiding support layer 17 maintains contact with the outer surface of the adsorbent 14 but does not affect the internal space of the adsorption cavity 15, and its outline is adapted to the external shape of the adsorbent 14.

[0051] Understandably, by providing a flow-guiding support layer 17, a relatively robust external framework is provided for the adsorbent 14, effectively preventing deformation or collapse of the adsorbent 14 due to external pressure during battery assembly or use, thus ensuring the integrity and long-term stability of the adsorption cavity 15 structure. Furthermore, the porous nature of the flow-guiding support layer 17 allows it to provide mechanical support without hindering gas permeation. Its internal continuous pore structure provides a path for gas to diffuse uniformly along the outer surface of the adsorbent 14, helping to distribute the gas more evenly to the periphery of the entire adsorption cavity 15, thereby optimizing the flow field for gas permeation into the adsorbent material 16 and improving the uniformity and efficiency of gas capture.

[0052] In one optional embodiment, the flow-guiding support layer 17 is a metal microporous support sheet. In this embodiment, the metal material is not limited; a suitable metal can be selected based on actual conditions, such as a thin sheet with a uniform microporous structure made of stainless steel or aluminum alloy, completely encapsulating the adsorbent 14 within it. The high rigidity of the metal provides effective support for the entire adsorption module composed of the waterproof and breathable membrane 13 and the adsorbent 14, thereby effectively resisting severe external compression and internal pressure impact, preventing structural deformation. Simultaneously, the excellent thermal conductivity of the metal helps to quickly dissipate heat that may be generated during adsorption, avoiding localized overheating and improving the module's thermal safety. Furthermore, the microporous structure on the metal microporous support sheet provides robust physical support while ensuring smooth gas flow.

[0053] In one optional embodiment, the flow-guiding support layer 17 is a polymer support mesh. For example, it is a mesh structure formed from polypropylene or nylon through a weaving process. This mesh structure can be arranged in a grid or honeycomb pattern on the outer layer of the adsorbent 14 to provide stronger support for the waterproof and breathable membrane 13 and the adsorbent 14, thereby preventing them from rupturing under pressure. Furthermore, this mesh structure can better conform to the shape of the adsorbent 14 and provide elastic constraint and protection when the battery undergoes slight deformation. In addition, the use of polymer materials provides excellent resistance to electrolyte corrosion, ensuring its long-term stability in the battery's chemical environment. Its mesh structure, while effectively encapsulating and supporting the gas, also provides a channel for uniform gas diffusion.

[0054] Optionally, the thickness of the flow-guiding support layer 17 can be set to 0.2mm–0.8mm or 0.3mm–0.5mm. The greater the thickness, the stronger the support force it can provide. Within the above thickness range, both the metal microporous support sheet and the polymer support mesh can provide sufficient rigidity or toughness to maintain the structural shape of the adsorbent 14 and effectively resist external compression. At the same time, its internal pore structure can remain unobstructed, ensuring that gas diffusion resistance is minimized and that it does not significantly affect gas flow efficiency. In addition, this thickness range helps to control the volume of the entire adsorption module, allowing it to be easily integrated into the limited edge space of the pouch battery 1 without significantly increasing the overall size of the battery.

[0055] Please see Figure 3 In one optional embodiment, a venting zone 121 includes a vent 1211, over which a waterproof and breathable membrane 13 covers and seals. The vent 1211 is a single, independent ventilation channel on the encapsulation housing 12. The cross-sectional shape of the vent 1211 can be circular, elliptical, or rectangular, etc., and can be selected according to actual conditions; its aperture size is designed to ensure sufficient gas passage capacity while also considering the structural strength of the encapsulation housing 12 and the convenience of the sealing process. The waterproof and breathable membrane 13 covers and seals over this single vent 1211.

[0056] Understandably, by setting a vent 121 as a single air guide hole 1211, the single air guide hole 1211 has a simple structure, which is more conducive to production and reduces manufacturing costs. At the same time, the single air guide hole 1211 can more effectively concentrate the airflow, which is conducive to the gas generated by the battery cell 11 passing through the air guide hole 1211 and sequentially entering the adsorption chamber 15 through the vent membrane, thereby achieving a rapid response to changes in internal pressure.

[0057] Please see Figure 4In one optional embodiment, the air-permeable zone 121 includes a plurality of air-guiding micropores 1212 arranged according to a preset arrangement, wherein the cross-sectional area of ​​the air-guiding micropores 1211 is larger than the cross-sectional area of ​​the air-guiding micropores 1212.

[0058] Understandably, the ventilated area 121 is composed of multiple air-guiding micropores 1212 arranged in a preset pattern, forming a micropore array. The preset arrangement includes, but is not limited to, rectangular arrays, annular arrays, or linear arrays. The cross-sectional shape of the air-guiding micropores 1212 includes, but is not limited to, circular, elliptical, or rectangular shapes, which can be selected according to the actual situation. The cross-sectional area of ​​each air-guiding micropore 1212 is smaller than the cross-sectional area of ​​a single air-guiding hole 1211, meaning the cross-sectional area of ​​the air-guiding hole 1211 is larger than the cross-sectional area of ​​any single air-guiding micropore 1212. Compared to opening a single air-guiding hole 1211 with a large area, the dispersed arrangement of multiple air-guiding micropores 1212 has less impact on the structural integrity of the encapsulation shell 12, helping to maintain the mechanical strength of the encapsulation shell 12 in this area. Furthermore, the uniform distribution of multiple air-guiding micropores 1212 helps the gas pass through the waterproof and breathable membrane 13 more evenly, avoiding the situation where gas concentrates and impacts local areas of the membrane under a single-pore structure, resulting in a more balanced gas distribution on the membrane surface, which is beneficial for improving gas exchange efficiency. In addition, the venting zone 121 is configured with multiple arranged air-guiding micropores 1212, which can disperse the flow rate of the electrolyte in the encapsulation shell and effectively block the impact of the liquid on the waterproof and breathable membrane 13, thereby reducing the risk of local liquid leakage and improving the reliability of the anti-liquid and air-permeable system composed of the venting zone 121 and the waterproof and breathable membrane 13.

[0059] Furthermore, the adsorbent material 16 includes any one of composite adsorbent material 16 and porous activated carbon, wherein the composite adsorbent material 16 is obtained by combining porous activated carbon with molecular sieve; and / or the waterproof and breathable membrane 13 includes any one of ePTFE membrane, PVDF membrane and PU membrane.

[0060] Understandably, the adsorbent material 16 can be selected according to the gas production characteristics of the battery. When porous activated carbon is selected, it can be composed of at least one of granular activated carbon, particulate activated carbon, honeycomb activated carbon knots, or fibrous activated carbon, and the specific surface area of ​​the porous activated carbon needs to be greater than 500 m² / g, such as 600 m² / g–1200 m² / g or 600 m² / g–850 m² / g; the particle size should be in the range of 10 μm–200 μm or 20 μm–80 μm; and the filling mass should be 0.2 g / Ah–2.0 g / Ah based on the battery capacity, thereby ensuring the adsorption effect of the porous activated carbon. Furthermore, porous activated carbon has a well-developed pore structure and a large specific surface area, exhibiting excellent adsorption performance for various organic gas molecules generated by the battery.

[0061] Optionally, when the adsorbent 16 is a composite adsorbent 16, it can be composed of porous activated carbon and molecular sieves in a specific ratio and manner. By adding molecular sieves, the regular crystalline channel structure and specific pore size distribution of the molecular sieves, as well as their preferential selective adsorption capacity for polar small molecules such as water molecules and carbon dioxide, complement the porous activated carbon, which mainly adsorbs organic gas molecules. Furthermore, the mass ratio of porous activated carbon to molecular sieves can be adjusted between 10:1 and 1:1. When organic solvent gases are expected to be the main product, a higher proportion of activated carbon can be used to utilize its large specific surface area for bulk adsorption. When it is necessary to focus on controlling small polar gases such as water vapor and carbon dioxide, the proportion of molecular sieves can be increased to leverage their selective adsorption advantages. This achieves an effective balance between adsorption performance and cost. By adding molecular sieves, the regular crystalline channel structure and specific pore size distribution of the molecular sieves, as well as their preferential selective adsorption capacity for polar small molecules such as water molecules and carbon dioxide, complement the porous activated carbon, which mainly adsorbs organic gas molecules.

[0062] Understandably, regardless of whether the adsorbent 16 is a composite adsorbent 16 or porous activated carbon, the waterproof and breathable membrane 13 can be made from one of ePTFE, PVDF, and PU membranes. That is, ePTFE, PVDF, and PU materials can all be used to prepare ePTFE, PVDF, and PU membranes with microporous structures, giving them waterproof and breathable functions. This effectively blocks liquid electrolytes while allowing gas molecules to pass freely, thus working synergistically with the adsorbent 16 to construct a reliable gas management channel and maintain the negative pressure in the adsorption chamber 15.

[0063] It should be noted that ePTFE membranes exhibit high chemical stability and permanent hydrophobicity; PVDF membranes offer a good balance between chemical resistance and mechanical strength; and PU membranes possess excellent flexibility. In this embodiment, the appropriate membrane material can be selected to prepare the waterproof and breathable membrane 13 according to the actual situation, thereby making the soft-pack battery 1 structure more suitable for the corresponding scenario.

[0064] Optionally, the thickness of the waterproof and breathable membrane 13 is 10μm–80μm, the equivalent pore size is 0.05μm–0.2μm, and the liquid inlet pressure is not less than 2000Pa. By synergistically limiting the thickness, equivalent pore size, and liquid inlet pressure of the waterproof and breathable membrane 13, it is ensured that the waterproof and breathable membrane 13 can simultaneously achieve efficient gas exchange and absolutely reliable electrolyte barrier in the application scenario of the pouch battery 1.

[0065] Please see Figure 5 and Figure 6Furthermore, the adsorbent 14 is an air-permeable but powder-impermeable inner bag 141 or a prefabricated modular adsorbent bag 142, wherein the prefabricated modular adsorbent bag 142 is lined with a powder-proof layer 1421.

[0066] Specifically, please refer to Figure 5 The breathable yet non-powder-permeable inner bag 141 can be made of polypropylene microporous fabric. Please refer to [link / reference]. Figure 6 The prefabricated modular adsorption bag 142 can be an aluminum-plastic bag or a microporous polymer composite bag. A dust-proof layer 1421 can be installed inside the aluminum-plastic bag or microporous polymer composite bag. The dust-proof layer 1421 allows gas to enter freely, but firmly confines the adsorbent material 16 inside the bag, preventing it from contaminating the battery cell 11 or clogging the waterproof and breathable membrane 13. Furthermore, the breathable but dust-proof inner bag 141 and the aluminum-plastic bag or microporous polymer composite bag have a wall thickness of 60μm–150μm, further ensuring that gas can enter but dust will not disperse.

[0067] Please see Figure 7 Optionally, the soft-pack battery 1 includes multiple adsorbents 14, one side of the waterproof and breathable membrane 13 covers all the breathable areas 121, and the side of the waterproof and breathable membrane 13 opposite to the breathable areas 121 covers all the openings of the adsorbents 14; and a gas guide channel 19 is provided between any two adjacent adsorption cavities 15 for gas transmission.

[0068] Understandably, a single, integrated waterproof and breathable membrane 13 is used to simultaneously cover all the breathable areas 121. One side of the waterproof and breathable membrane 13 is directly sealed and adhered to the side of the encapsulation shell 12 where the breathable areas 121 are located, so as to completely cover all the breathable areas 121 within its sealing range; its other side simultaneously covers and seals all the openings of the adsorbent 14, realizing the integration of multiple interfaces that need to be sealed into one, simplifying the sealing process and reducing the risk of leakage.

[0069] Please see Figure 7 Optionally, a gas guiding channel 19 can be provided between any two adsorption chambers 15 for gas transmission, thereby enabling gas flow between different adsorption chambers 15 and allowing the pressure of the entire system to quickly reach equilibrium. In this embodiment, a gas guiding channel 19 can also be provided between any two adjacent adsorption chambers 15 for gas transmission, establishing a gas connection path between adjacent adsorption chambers 15 and connecting multiple originally independent adsorption chambers 15 into an interconnected system. When the gas production rate is inconsistent in different areas of the battery cell 11, the gas can flow between adjacent adsorption chambers 15 through the gas guiding channel 19, allowing the pressure of the entire system to quickly reach equilibrium. This not only avoids premature saturation of the adsorption chamber 15 due to concentrated gas production in local areas, but also ensures that all adsorption materials 16 can be fully utilized, improving the overall adsorption capacity utilization efficiency.

[0070] Understandably, in the first embodiment, the encapsulation process of the outer shell 12, the waterproof and breathable membrane 13, the absorbent body 14, and the absorbent material 16 is as follows: The first step is to fill the absorbent material 16 into the breathable but powder-impermeable inner bag 141 and sieve it by ultrasonic or low-intensity vibration to remove large particles, and then heat seal the bag opening. The second step is to place the breathable and non-permeable inner bag 141, the flow-guiding support layer 17 and the waterproof and breathable membrane 13 in the predetermined position on the long side of the packaging shell 12 in the stacking order, and then complete the edge sealing heat sealing process before the whole package is injected with liquid. The third step is to pre-set the heat sealing parameters, including temperature, pressure, time, etc., and adjust them according to the aluminum-plastic film and the heat sealing layer material to ensure the airtightness of the sealing edge and avoid mechanical damage to the waterproof and breathable membrane 13.

[0071] Please see Figure 8 and Figure 9 The present invention provides a second embodiment. Based on the first embodiment, the second embodiment prefabricates a gas adsorption module 28 by means of a waterproof and breathable membrane 23, an adsorbent 24, an adsorbent material 26, and a flow-guiding support layer 27 covering the outer layer of the adsorbent 24. The soft-pack battery 2 includes at least two gas adsorption modules 28, and at least one gas adsorption module 28 covers all the breathable areas 221.

[0072] It should be noted that the second embodiment differs from the first embodiment only in that, in the first embodiment, the adsorbent 24, waterproof and breathable membrane 23, adsorbent material 26, and flow-guiding support layer 27 are not pre-integrated into a single module, but are directly installed sequentially on the battery's encapsulation shell 22 before encapsulation. In the second embodiment, the waterproof and breathable membrane 23, adsorbent 24, adsorbent material 26, and the flow-guiding support layer 27 covering the adsorbent 24 are prefabricated together to form an independent gas adsorption module 28. This independent gas adsorption module 28 is then installed on the encapsulation shell 22 for encapsulation, while the rest of the structure remains the same. This simplifies the integration of the gas adsorption module 28 with the encapsulation shell 22. Furthermore, the prefabricated gas adsorption module 28 can undergo independent quality inspection to ensure its reliability before being installed in the battery, improving product consistency and yield.

[0073] Optionally, the gas adsorption module 28 includes an adsorption chamber 25. At least two gas adsorption modules 28 can be arranged on one side of the packaging shell 22 to cover all the gas-permeable areas 221. The design of the independent gas adsorption module 28 allows the gas generated by the cell 21 during operation to enter the adsorption chamber 25 for adsorption, thereby completing the gas collection. Furthermore, it can flexibly adjust the number and arrangement of the gas adsorption modules 28 according to the battery capacity, size and gas generation characteristics, to achieve efficient and full-coverage management of large-area or distributed gas generation areas, which is suitable for large-capacity or long strip batteries. This improves the flexibility and scalability of the prefabricated gas adsorption module 28 in the field of soft-pack batteries 2.

[0074] Optionally, a gas guide channel 29 can be provided between any two gas adsorption modules 28 for gas transmission, thereby enabling gas flow between different gas adsorption modules 28 and allowing the pressure of the entire system to quickly reach equilibrium. In this embodiment, a gas guide channel 29 can also be provided between any two adjacent gas adsorption modules 28 for gas transmission, establishing a gas connection path between adjacent gas adsorption modules 28 and connecting multiple originally independent gas adsorption modules 28 into an interconnected system. When the gas production rate is inconsistent in different areas of the battery cell 21, the gas can flow between adjacent gas adsorption modules 28 through the gas guide channel 29, allowing the pressure of the entire system to quickly reach equilibrium. This not only avoids premature saturation of the adsorption material 26 due to concentrated gas production in local areas, but also ensures that all adsorption materials 26 can be fully utilized, improving the overall utilization efficiency of the adsorption capacity.

[0075] Understandably, when multiple gas adsorption modules 28 are provided, the number of permeable zones 221 can also be set to multiple. The number of gas adsorption modules 28 must be equal to or greater than the number of permeable zones 221, and one gas adsorption module 28 must be positioned on each permeable zone 221 to ensure that the gas passing through the permeable zone 221 can enter the adsorption chamber 25 and be absorbed by the adsorption material 26. The multiple permeable zones 221 can be arranged uniformly or non-uniformly, depending on the actual situation. It is necessary to ensure that the position of the gas adsorption module 28 corresponds to the position of the permeable zone 221.

[0076] Understandably, in the second embodiment, the encapsulation process of the housing 22 and the gas adsorption module 28 is as follows: A gas adsorption module 28 is prefabricated by the waterproof and breathable membrane 23, the adsorbent 24, the adsorption material 26, and the flow-guiding support layer 27 covering the adsorbent 24, and each adsorption module is individually packaged and leak-tested. Specifically, such as Figure 9As shown, multiple gas adsorption modules 28 are placed at predetermined positions along the long side of the encapsulation shell 22 at preset intervals and interconnected by gas guiding channels 29. After all gas adsorption modules 28 are placed, the entire edge is heat-sealed.

[0077] Please see Figure 10 The third embodiment of this utility model provides a soft-pack battery 3. Based on the first embodiment, the soft-pack battery 3 in the third embodiment includes a battery cell 31 and a packaging shell 32 surrounding the battery cell 31. The packaging shell 32 is provided with at least one ventilated area 321. A waterproof and breathable membrane 33 is provided on the ventilated area 321. An adsorbent 34 is provided on the waterproof and breathable membrane 33. An adsorbent cavity 35 is provided inside the adsorbent 34 and is isolated from the waterproof and breathable membrane 33 by the inner wall 341 of the adsorbent 34. An adsorbent material 36 is provided in the adsorbent cavity 35. The projected area of ​​the adsorbent cavity 35 on the plane to which the ventilated area 321 belongs is larger than the area of ​​the ventilated area 321.

[0078] It should be noted that the third embodiment differs from the first embodiment in that the adsorbent 34 in the first embodiment is a semi-enclosed structure, while the adsorbent 34 in the third embodiment is a fully enclosed structure, such as a U-shaped structure. The materials used for the remaining structures can remain the same. Specifically, in the third embodiment, an adsorption cavity 35 is provided inside the adsorbent 34 for filling with adsorbent material 36. That is, the adsorption cavity 35 inside the adsorbent 34 is completely isolated from the external environment by its own solid material wall, thereby forming a hierarchical structure of built-in adsorption cavity 35 and solid adsorbent 34. At this point, one side of the waterproof and breathable membrane 33 still covers the breathable area 321 and is in direct contact with it, while the side opposite to the breathable area 321 is in direct contact with the inner wall 341 of the adsorbent 34. The waterproof and breathable membrane 33 and the adsorbent material 36 are isolated by the inner wall 341 of the adsorbent 34. This allows the gas generated by the battery cell 31 during operation to pass through the breathable area 321, then sequentially through the waterproof and breathable membrane 33 and the inner wall 341 of the adsorbent 34 before entering the adsorption chamber 35 and being adsorbed by the adsorbent material 36. Therefore, in this embodiment, the combined action of the waterproof and breathable membrane 33 and the adsorbent 34 can actively and continuously adsorb the gas generated by the battery cell 31 during operation, more effectively delaying battery expansion, preventing seal rupture and electrolyte leakage, and thus improving gas capture efficiency. This more effectively suppresses the safety hazards posed by electrolyte leakage. In addition, even if the waterproof and breathable membrane 33 is damaged, the electrolyte inside its encapsulation shell will be blocked by the inner wall 341 of the adsorbent 34, which further avoids the risk of electrolyte leakage.

[0079] Understandably, by incorporating an adsorption cavity 35 within the adsorption body 34, the adsorption material 36 is encased within the adsorption body 34, thus better securing the position of the adsorption material 36 and preventing it from escaping. This facilitates the alignment of the adsorption material 36 with the breathable area 321. Furthermore, the adsorption body 34, the built-in adsorption cavity 35, and the adsorption material 36 within the adsorption cavity 35 form an independent module, which further enhances the alignment of the adsorption body 34 with the waterproof and breathable components, thereby simplifying the overall encapsulation process.

[0080] Please see Figure 11 Furthermore, the soft-pack battery 3 also includes a flow-guiding support layer 37; when the adsorption cavity 35 is provided inside the adsorbent 34, the waterproof and breathable membrane 33 extends from the side covering the breathable area 321 to the side away from the breathable area 321 and covers the entire adsorbent 34, and the flow-guiding support layer 37 is sandwiched between the waterproof and breathable membrane 33 and the adsorbent 34.

[0081] Specifically, in this embodiment, besides the structure of the adsorbent 34 differing from the first embodiment, the arrangement of the waterproof and breathable membrane 33 can also differ from that of the waterproof and breathable membrane 13 in the first embodiment. In the first embodiment, the waterproof and breathable membrane 13 only covers one side of the breathable area 121, that is, only covers the side of the adsorbent 14 where the opening is located. In this embodiment, the waterproof and breathable membrane 33 can extend from the side covering the breathable area 321 to the side away from the breathable area 321, covering the entire adsorbent 34. That is, based on the structure of the adsorbent 34 with an adsorption cavity 35 inside, the waterproof and breathable membrane 33 starts from the position covering the breathable area 321 and extends in the direction away from the breathable area 321, so that its extended portion completely covers the outer surface of the entire adsorbent 34. The flow-guiding support layer 37 is sandwiched between the waterproof and breathable membrane 33 and the adsorbent 34, forming a layered structure from the inside out: adsorbent material 36—adsorbent 34—flow-guiding support layer 37—waterproof and breathable membrane 33. The waterproof and breathable membrane 33 serves as the outermost layer, completely enveloping and sealing the combination of the absorbent 34 and the flow-guiding support layer 37.

[0082] Understandably, the flow-guiding support layer 37, sandwiched between the waterproof and breathable membrane 33 and the adsorbent 34, provides uniform support for the solid structure of the internal adsorbent 34 and effectively disperses local pressure that may act on the outer waterproof and breathable membrane 33. This prevents damage to the internal structure of the adsorbent 34 due to external pressure, while providing reliable puncture protection for the relatively fragile waterproof and breathable membrane 33, ensuring it is not damaged by minor protrusions or external stresses on the surface of the adsorbent 34 under complex working conditions. Furthermore, the flow-guiding support layer 37 itself does not obstruct gas passage. When gas penetrates the outer waterproof and breathable membrane 33, the continuous pore structure inside the flow-guiding support layer 37 immediately provides a uniform diffusion channel for the gas, guiding it to rapidly distribute along the outer surface of the adsorbent 34. This optimizes the path of the gas into the adsorption cavity 35 inside the adsorbent 34, ensuring gas capture efficiency.

[0083] Please continue reading. Figure 11 Furthermore, a one-way vent valve 331 is provided on the side of the waterproof and breathable membrane 33 that avoids covering the breathable area 321. That is, the one-way vent valve 331 is not located between the waterproof and breathable membrane 33 and the breathable area 321, but between the waterproof and breathable membrane 33 and the outside world, thereby connecting the waterproof and breathable membrane 33 with the outside world. When the amount of gas generated by the battery cell 31 is continuously too high, causing the adsorbent material 36 in the adsorption chamber 35 to become saturated and the adsorption efficiency to decrease, the pressure inside the chamber will increase accordingly. At this time, the one-way vent valve 331 can open when the preset chamber pressure threshold is reached, and the excess gas is directionally discharged to the outside of the battery. This ensures that even after the adsorption capacity of the adsorbent material 36 reaches its upper limit, the safety of the overall structure can still be maintained through controllable pressure relief, preventing damage to the adsorption chamber 35 due to internal pressure accumulation. This achieves a seamless connection from active adsorption to safe release, improving the overall robustness and safety limit of the gas management system.

[0084] Please see Figure 12 Optionally, the soft-pack battery 3 includes multiple adsorbents 34 with adsorption cavities 35 inside, and a waterproof and breathable membrane 33 covers all the breathable areas 321 and at least covers the adsorbents 34 corresponding to the breathable areas 321.

[0085] Understandably, by setting one side of the waterproof and breathable membrane 33 to completely cover and seal all the venting areas 321 on the outer casing 32, it is ensured that all gas emission channels are effectively managed. The side of the waterproof and breathable membrane 33 facing away from the venting areas 321 extends and covers at least all the adsorbents 34 corresponding to the positions of the venting areas 321. This ensures that there is an adsorbent 34 directly above each venting area 321 covered by the waterproof and breathable membrane 33, thus forming a complete gas treatment unit. Furthermore, gas is transferred between different adsorbents 34 through the gas guide channel 39 to achieve gas flow between different gas adsorption modules 38, allowing the pressure of the entire system to quickly reach equilibrium. The specific arrangement of the gas guide channel 39 in this embodiment can be the same as that in the first embodiment, and will not be elaborated upon here.

[0086] Understandably, the packaging method in this embodiment can be the same as that in the first embodiment, and this embodiment will not elaborate on this.

[0087] Please see Figure 13 and Figure 14 The fourth embodiment of this utility model provides a soft-pack battery 4. Based on the third embodiment, the waterproof and breathable membrane 43, the adsorbent 44 and the flow-guiding support layer 47 disposed between the waterproof and breathable membrane 43 and the adsorbent 44 are prefabricated to form a gas adsorption module 48. The soft-pack battery 4 includes at least two gas adsorption modules 48, and at least one gas adsorption module 48 covers all the breathable areas 421.

[0088] It should be noted that the fourth embodiment differs from the third embodiment only in that, in the third embodiment, the adsorbent 44, adsorption cavity 45, adsorbent material 46, waterproof and breathable membrane 43, and flow-guiding support layer 47 are not pre-integrated into a single module, but are directly installed sequentially on the battery's encapsulation shell 42 before encapsulation. In the fourth embodiment, the waterproof and breathable membrane 43, adsorbent 44, the adsorbent material 46 filled in the adsorption cavity 45 within the adsorbent 44, and the flow-guiding support layer 47 positioned between the waterproof and breathable membrane 43 and the adsorbent 44 are prefabricated together to form an independent gas adsorption module 48. This independent gas adsorption module 48 is then installed on the encapsulation shell 42 for encapsulation. The remaining structures remain the same, thus simplifying the integration of the gas adsorption module 48 with the encapsulation shell 42. Furthermore, gas is transferred between different gas adsorption modules 48 through the gas guiding channel 49 to facilitate gas flow between them, allowing the pressure of the entire system to quickly reach equilibrium. In this embodiment, the specific configuration of the air guide channel 49 is the same as that in the first embodiment, and will not be described in detail here.

[0089] Optionally, gases generated during the operation or abuse of the battery cell 41, such as solvent vapors and decomposition gases, preferentially converge upwards along the plane of the battery cell 41 and towards its long side. In any of the above embodiments, the venting area 421 can be located on the plane of at least one long side of the encapsulation shell 42, and a corresponding adsorbent 44 can be provided in the venting area 421. This utilizes the gas flow field aggregation effect to form a highly efficient gas capture and adsorption area, reducing the rate of internal pressure increase and minimizing the risk of potential electrolyte leakage.

[0090] Understandably, the waterproof and breathable membrane 43 and the absorbent body 44 are integrally fixed with the encapsulation shell 42 by heat sealing or bonding, and the width of the long side sealing edge can be 4mm–12mm.

[0091] Understandably, the packaging method in this embodiment can be the same as that in the second embodiment, and this embodiment will not elaborate on this.

[0092] Understandably, in any of the above embodiments, a complete adsorption system consisting of a waterproof and breathable membrane 43, an adsorbent body 44, an adsorbent material 46, etc., needs to be encapsulated in the reserved position of the encapsulation shell 42 of the battery cell 41. After encapsulation, the entire adsorption system will be enclosed by the shell wall of the encapsulation shell 42 and the encapsulation shell formed during subsequent encapsulation, thereby realizing the integration of the entire adsorption system with the battery cell 41 and making the overall structure more stable.

[0093] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

[0094] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A soft-pack battery, characterized in that: The device includes a battery cell and a casing surrounding the battery cell. The casing has at least one ventilated area, and a waterproof and breathable membrane is disposed on the ventilated area. An adsorbent is disposed on the waterproof and breathable membrane. The adsorbent surrounds the side of the waterproof and breathable membrane opposite to the ventilated area and forms an adsorption cavity accordingly, or an adsorption cavity is disposed inside the adsorbent. The adsorption cavity is isolated from the waterproof and breathable membrane by the inner wall of the adsorbent. Adsorbent material is disposed inside the adsorption cavity. The projected area of ​​the adsorption cavity on the plane to which the ventilated area belongs is larger than the area of ​​the ventilated area.

2. The soft-pack battery as described in claim 1, characterized in that: The soft-pack battery also includes a flow-guiding support layer; when the adsorbent surrounds the side of the waterproof and breathable membrane away from the breathable area to form an adsorption cavity, the flow-guiding support layer is placed on the outer layer of the adsorbent, or when the adsorbent is provided with an adsorption cavity inside, the waterproof and breathable membrane extends from the side covering the breathable area to the side away from the breathable area to cover the entire adsorbent, and the flow-guiding support layer is sandwiched between the waterproof and breathable membrane and the adsorbent.

3. The soft-pack battery as described in claim 2, characterized in that: The flow-guiding support layer is either a metal microporous support sheet or a polymer support mesh.

4. The soft-pack battery as described in claim 1, characterized in that: The breathable zone includes a single air vent or the breathable zone includes multiple air vents arranged in a preset pattern, wherein the cross-sectional area of ​​the air vent is larger than the cross-sectional area of ​​the air vent.

5. The soft-pack battery as described in claim 2, characterized in that: The adsorbent is an air-permeable but powder-impermeable inner bag or a prefabricated modular adsorbent bag, and the prefabricated modular adsorbent bag is lined with a powder-proof layer.

6. The soft-pack battery as described in claim 2, characterized in that: A one-way vent valve is provided on the side of the waterproof and breathable membrane that avoids covering the breathable area.

7. The soft-pack battery as described in claim 2, characterized in that: The waterproof and breathable membrane, the adsorbent, the adsorbent material, and the flow-guiding support layer covering the adsorbent together prefabricate a gas adsorption module. The soft-pack battery includes at least two gas adsorption modules, and at least one of the gas adsorption modules covers all the breathable areas.

8. The soft-pack battery as described in claim 2, characterized in that: The soft-pack battery includes multiple adsorbents with internal adsorption cavities, and the waterproof and breathable membrane covers all the breathable areas and at least the adsorbents corresponding to the breathable areas.

9. The pouch cell battery as described in claim 7 or 8, characterized in that: A gas guide channel is provided between any two adjacent gas adsorption modules or any two adjacent adsorption chambers for gas transmission.

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