Pouch battery cell and electronic device

Abstract

The embodiment of the application provides a soft package battery cell and electronic equipment, and relates to the technical field of battery storage. The soft package battery cell comprises a shell, a partition piece arranged in the shell, the partition piece is used for separating the space in the shell into a first cavity and a second cavity, the first cavity is used for accommodating a pole core, and the second cavity is used for accommodating an electrolyte or an electrolyte capsule; the partition piece is configured to be damaged to communicate the first cavity and the second cavity. The soft package battery cell and the electronic equipment can prevent irreversible attenuation of the battery cell in the stage of waiting for use such as storage and transportation, and indirectly prolong the service life of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery storage technology, and in particular to a pouch cell and electronic device. Background Technology

[0002] Soft-pack cells are lithium-ion batteries that use aluminum-plastic film as the casing. The casing is thin, light, and highly malleable. While achieving high energy density, they also have good shape adaptability and safety performance, and are widely used in electronic products such as smartphones, drones, and wearable devices.

[0003] In related technologies, soft-pack batteries adopt a process of first injecting electrolyte and then encapsulating. The specific process is as follows: the stacked or wound electrode cores are put into the interior of the aluminum-plastic film shell, electrolyte is injected through the injection hole, followed by vacuum degassing, pre-sealing and impregnation, and finally the encapsulation is completed to form a sealed battery cell structure.

[0004] However, the electrolyte comes into contact with the electrode core before packaging, causing interfacial side reactions to continue to occur in the battery cell during storage and transportation, resulting in irreversible capacity decay. When the user actually uses the battery cell, the overall performance of the battery cell has already undergone a certain degree of irreversible decay. Utility Model Content

[0005] This application provides a soft-pack battery cell and an electronic device to solve the technical problem that battery cells in related technologies continuously undergo interface side reactions during storage and transportation, resulting in irreversible capacity decay.

[0006] In a first aspect, embodiments of this application provide a pouch cell, comprising:

[0007] case;

[0008] A separator is disposed within the housing, the separator being used to divide the space within the housing into a first cavity and a second cavity, the first cavity being used to accommodate the electrode core, and the second cavity being used to accommodate the electrolyte or electrolyte bladder.

[0009] The separator is configured to be destructible to connect the first cavity and the second cavity.

[0010] In some embodiments, the separator is configured to break under the action of the external force to connect the first cavity and the second cavity.

[0011] In some embodiments, the separator is a polypropylene heat-sealing layer, an aluminum foil and PP co-extruded part, or a PET ceramic vapor-deposited PP part.

[0012] In some embodiments, the separator is used to dissolve and be destroyed at a temperature greater than or equal to the preset temperature to connect the first cavity and the second cavity.

[0013] In some embodiments, the separator is a thermoplastic polymer, a water-soluble film, a low-melting-point alloy, or a wax.

[0014] In some embodiments, the separator is used to dissolve and be destroyed when the idle time is greater than or equal to a preset time, so as to connect the first cavity and the second cavity.

[0015] In some embodiments, the separator is a polyvinyl alcohol component, a polycaprolactone component, or a modified cellulose component.

[0016] In some embodiments, the separator includes a partition and a connecting portion, the connecting portion being disposed circumferentially along the partition, one side of the connecting portion being connected to the partition, and the other side of the connecting portion being connected to the inner wall of the housing.

[0017] In some embodiments, the thickness of the connecting portion is less than the thickness of the separating portion, or the connecting portion has a recess along its circumference.

[0018] In some embodiments, a protective film is also included, which is connected to the outer wall of the housing and is disposed circumferentially along the partition.

[0019] In some embodiments, an exhaust valve is further included, which is connected to the housing and communicates with the first cavity.

[0020] In some embodiments, the housing is provided with a replacement port, the replacement port is in communication with the second cavity, and the housing is detachably connected with an opening and closing plate for opening and closing the replacement port.

[0021] This application provides an electronic device, including a device body and the aforementioned pouch cell connected to the device body.

[0022] This application provides a pouch cell and an electronic device. The pouch cell provided by this application uses a separator to divide the space inside the casing into a first cavity and a second cavity. This allows the first cavity and the second cavity to isolate the electrode core and the electrolyte. During the storage stage, this prevents chemical reactions between the electrode core and the electrolyte, blocks the reaction path for the formation of an SEI film on the negative electrode surface, and prevents the increase in lithium-ion transport resistance and irreversible capacity decay caused by the thickening of the SEI film. During the activation stage, the separator is broken to connect the first cavity and the second cavity, allowing the electrolyte to flow towards the electrode core, thereby activating the pouch cell and extending its storage life. The separator eliminates self-discharge and chemical side reactions of the pouch electrode core during the storage stage. This is suitable for scenarios requiring long-term storage of pouch cells, such as emergency power supplies and military equipment, indirectly improving the applicability of pouch cells. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] Figure 1 This application provides a cross-sectional structural diagram of a pouch cell. Figure 1 ;

[0025] Figure 2 This application provides a cross-sectional structural diagram of a pouch cell. Figure 2 ;

[0026] Figure 3 This application provides a cross-sectional structural diagram of a pouch cell. Figure 3 ;

[0027] Figure 4 for Figure 1 Schematic diagram of the separator in the middle Figure 1 ;

[0028] Figure 5 for Figure 1 Schematic diagram of the separator in the middle Figure 2 ;

[0029] Figure 6 for Figure 1 Schematic diagram of the separator in the middle Figure 3 ;

[0030] Figure 7 A schematic diagram of the replacement port for the pouch cell is provided for this application;

[0031] Figure 8 An exploded structural diagram of the opening and closing plate of the pouch cell is provided for this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Shell; 110. First cavity; 120. Second cavity;

[0034] 200. Divider; 210. Divider section; 220. Connecting part; 221. Dent;

[0035] 300. Protective film;

[0036] 400. Exhaust valve;

[0037] 500. Replacement port; 510. Opening / closing plate.

[0038] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0040] In related technologies, soft-pack battery cells adopt a manufacturing process of first injecting electrolyte and then encapsulating. The specific process includes: first, placing the dried electrode core that has been stacked or wound into the cavity of the aluminum-plastic film shell, and injecting a certain amount of electrolyte into the cavity through the injection hole through the injection system; then, degassing treatment is carried out in a vacuum environment to remove the gas in the electrode pores, and then the injection hole is pre-sealed by the heat sealing process; finally, it is left to stand and soak under specific temperature conditions to allow the electrolyte to fully penetrate into the microporous structure of the electrode, and finally complete the full encapsulation to form a closed battery cell structure.

[0041] However, this process has inherent defects: because the electrolyte comes into direct contact with the active materials in the core before final packaging, electrochemical side reactions continue to occur in the core during subsequent storage and transportation waiting stages. These reactions include the uncontrolled growth of the CEI film at the positive electrode interface and the continuous thickening of the SEI film at the negative electrode, which continuously consumes the active lithium ions in the system. As a result, the core has already experienced irreversible capacity decay, increased internal resistance and other performance degradation before the user actually uses it, which directly affects the product's service life and energy efficiency.

[0042] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0043] Combination Figure 1 , Figure 2 and Figure 3 This application provides a soft-pack battery cell, including a housing 100 and a separator 200. The separator 200 is disposed inside the housing 100 and is used to divide the space inside the housing 100 into a first cavity 110 and a second cavity 120. The first cavity 110 is used to accommodate the electrode core, and the second cavity 120 is used to accommodate electrolyte or electrolyte bladder. The separator 200 is configured to be destructible to connect the first cavity 110 and the second cavity 120.

[0044] By adopting the above technical solution, the space inside the housing 100 is divided into a first cavity 110 and a second cavity 120 by using a separator 200. This allows the first cavity 110 and the second cavity 120 to isolate the electrode core and the electrolyte. During the storage stage, this prevents chemical reactions between the electrode core and the electrolyte, blocks the reaction path for the formation of an SEI film on the negative electrode surface, and prevents the increase in lithium-ion transport resistance and irreversible capacity decay caused by the thickening of the SEI film. During the activation stage, by breaking the separator 200, the first cavity 110 and the second cavity 120 are connected, allowing the electrolyte to flow towards the electrode core, thereby activating the soft-pack battery and extending its storage life. The separator 200 eliminates self-discharge and chemical side reactions of the soft-pack electrode core during the storage stage. This solution is suitable for scenarios requiring long-term storage of soft-pack batteries, such as emergency power supplies and military equipment, indirectly improving the applicability of soft-pack batteries.

[0045] In this embodiment, the number of the first cavity 110 and the second cavity 120 can be adjusted adaptively as needed. For example, the first cavity 110 can be set to one and the second cavity 120 can be set to one. At this time, the separator 200 is set to one. When there is only one first cavity 110 and one second cavity 120, the relative position of the first cavity 110 and the second cavity 120 can be adjusted adaptively as needed. For example, the first cavity 110 can be set at the upper part, lower part or one side of the second cavity 120.

[0046] In some embodiments, when there is one first cavity 110 and two second cavities 120, there are two separators 200. The two second cavities 120 can be respectively disposed on both sides or on the upper and lower parts of the first cavity 110, so that the electrolyte can be mixed with the electrode core in two directions, thereby further activating the soft-pack battery cell.

[0047] In some embodiments, multiple sets of the first cavity 110 and the second cavity 120 may be provided. In this case, multiple separators 200 are provided, and multiple sets of the first cavity 110 and the second cavity 120 are arranged in the housing 100 so that multiple pole cores can be activated simultaneously or separately.

[0048] In this embodiment, the second cavity 120 is used to contain the electrolyte. When the separator 200 fails, the electrolyte can flow directly along the second cavity 120 into the first cavity 110, thereby activating the soft-pack battery cell.

[0049] In some embodiments, the second cavity 120 can also be used to contain an electrolyte bladder. When the separator 200 is damaged, the electrolyte bladder can fail simultaneously with the separator 200, or the user can manually open the electrolyte bladder, so that the electrolyte can also flow into the first cavity 110 to activate the soft-pack battery cell. The electrolyte bladder is made of a multi-layer co-extruded film resistant to electrolyte. The edge of the electrolyte bladder is weakly bonded to the isolation strip. 10%-20% gas phase space is reserved inside the electrolyte bladder to alleviate internal pressure fluctuations caused by temperature changes. By using the separator 200 and the electrolyte bladder, a secondary seal can be achieved for the electrolyte, preventing premature activation of the soft-pack battery cell when either the separator 200 or the electrolyte bladder is damaged.

[0050] In this embodiment, the housing 100 uses an aluminum-plastic composite film, which is a flexible packaging material composed of three layers of different functional materials: the outer layer is a puncture-resistant nylon layer, which provides mechanical protection and insulation; the middle layer is aluminum foil, which provides excellent gas and moisture barrier properties to prevent electrolyte evaporation and external environmental intrusion; and the inner layer is a polypropylene or modified polypropylene heat-sealing layer. This composite structure achieves a sealing and protective effect of the housing 100 comparable to that of metal while ensuring lightweight and flexibility.

[0051] The separator 200 is designed to break under external force to be destroyed, thereby connecting the first cavity 110 and the second cavity 120.

[0052] In this embodiment, the external force can be applied by manually squeezing the housing 100 or by using a pressure device to apply a preset pressure to the housing 100. The connection strength between the partition 200 and the inner wall of the housing 100 is deliberately controlled to be lower than the strength of the housing 100 itself, so as to ensure that under the action of external force, the damage only occurs at the preset weak point (i.e., the connection between the partition and the inner wall of the housing 100), and will not cause the housing 100 itself to break.

[0053] The separator 200 is a polypropylene heat-sealing layer, a co-extruded aluminum foil and PP component, or a PET ceramic vapor-deposited PP component. In some embodiments, the separator 200 is a polypropylene heat-sealing layer, which is the same as the polypropylene heat-sealing layer of the inner layer of the aluminum-plastic film. By making the melt index of the polypropylene heat-sealing layer higher (using high-flow-grade resin, MFR of 20g / 10min-40g / 10min), or by blending a small amount of 5%-10% PE elastomer, the polypropylene heat-sealing layer can be heat-sealed at lower temperatures (150℃-160℃) and lower pressures (0.35MPa–0.4MPa), thereby forming a mechanically strong... The heat-sealing interface is weaker than that of conventional encapsulation areas; a normal polypropylene heat-sealing layer requires 180℃ and 0.5MPa to seal firmly, while this separator 200 only requires 150℃-160℃ and 0.35MPa-0.4MPa to seal. This ensures homogeneity with the aluminum-plastic film and reduces the connection strength between the separator 200 and the inner wall of the housing 100. By applying external force, the housing 100 will not break, while the connection between the separator 200 and the inner wall of the housing 100 can be torn apart, thereby achieving the mixing of electrolyte and electrode core.

[0054] In some embodiments, the separator 200 is a co-extruded part of aluminum foil and PP. The co-extruded part of aluminum foil and PP consists of aluminum foil (thickness 20μm-40μm) + adhesive layer + PP heat-sealing layer (thickness 30μm-60μm), which is homogeneous with the inner layer of aluminum-plastic film. It can be weakly sealed under low temperature and low pressure (140℃-155℃, 0.3MPa-0.35MPa). The advantage of the co-extruded part of aluminum foil and PP is that it has high brittleness (flexural strength ≤100MPa, elongation at break ≤5%), is sensitive to cracking, and cracks when pressed by external force without damaging the higher strength aluminum-plastic film.

[0055] In some embodiments, the separator 200 is a PET ceramic vapor-deposited PP part, which includes a PET film skeleton (thickness 12μm-25μm) and a ceramic vapor-deposited layer (…). or The inner layer of the aluminum-plastic film (thickness 50nm-200nm) and the PP heat-sealing layer (thickness 30μm-50μm), are homogeneous with the inner layer of the aluminum-plastic film. Weak sealing can be completed under low temperature and low pressure (145℃-160℃, 0.32MPa-0.38MPa). PET ceramic-deposited PP parts, due to the absence of exposed metal in the insulating ceramic layer, have a volume resistivity > To prevent the risk of short circuits, the PET ceramic vapor-deposited PP parts have an internal PET skeleton, which can prevent fragments from flying when broken, ensuring good safety. They will crack under external pressure without damaging the stronger aluminum-plastic film.

[0056] In some embodiments, a portion of the separator 200 may be inserted through the housing 100 and extend to the outside of the housing 100. By grasping the portion of the separator 200 located outside the housing 100, an external force is applied to the separator 200 manually or mechanically to remove the separator 200 from the housing 100, so that the first cavity 110 and the second cavity 120 are connected. At this time, the position where the separator 200 protrudes from the housing 100 also needs to be sealed, for example, by using the same material to melt and seal.

[0057] In some embodiments, the separator 200 is used to dissolve and be destroyed at a temperature greater than or equal to a preset temperature to connect the first cavity 110 and the second cavity 120.

[0058] The separator 200 is a thermoplastic polymer, a water-soluble film, a low-melting-point alloy, or a wax.

[0059] The thermoplastic polymer, such as PE or PP, is made by forming PE or PP into a microporous membrane (pore size 0.1μm-1μm, porosity 40%-60%). When the temperature exceeds the melting point of PE or PP (PE 105℃-135℃, PP 130℃-171℃), it will melt and shrink to connect the first cavity 110 and the second cavity 120. The temperature required for the thermoplastic polymer, such as PE or PP, to melt does not reach the tolerance limit of the aluminum-plastic composite shell (usually >200℃), so the shell 100 is not affected when the preset temperature is reached.

[0060] Water-soluble films, such as PVA (thickness 20μm-100μm, degree of hydrolysis 85%-99%), connect the first cavity 110 and the second cavity 120 by dissolving upon heating (dissolution temperature adjustable from 60℃ to 90℃). The advantages of water-soluble films are rapid triggering (dissolution time <10s), adjustable dissolution temperature, and the fact that its dissolution process is a purely physicochemical change that does not react chemically with the aluminum foil and nylon layer that make up the shell, thus ensuring the integrity of the shell. When using water-soluble films, an aqueous electrolyte, such as that used in lead-acid batteries or alkaline batteries, must be used.

[0061] Low-melting-point alloy components (such as bismuth-based alloys with melting points of 47℃-138℃; or gallium-based alloys with melting points of 15℃-30℃) connect the first cavity 110 and the second cavity 120 through a phase change from solid to liquid. The advantages of low-melting-point alloy components are good sealing performance and precise triggering. After dissolving, the low-melting-point alloy components are chemically stable under normal cell operating conditions and have good compatibility with the shell material. Their low melting point also means that the dissolution process will not transfer too much heat to the shell.

[0062] Wax-based components (such as paraffin wax, melting point 50℃-70℃; or microcrystalline wax, melting point 60℃-90℃) are connected to the first cavity 110 and the second cavity 120 by heating and liquefying. The advantages of wax-based components are high plasticity and low cost. As an organic material with stable chemical properties under battery working conditions, it has good compatibility with the inner layer of the shell and will not cause corrosion or swelling.

[0063] In some embodiments, the separator 200 is used to dissolve and be destroyed when the idle time is greater than or equal to a preset time, so as to connect the first cavity 110 and the second cavity 120.

[0064] In this embodiment, the idle time is the storage time from the completion of cell packaging to the first activation and use.

[0065] The separator 200 can be a polyvinyl alcohol component, a polycaprolactone component, or a modified fiber component.

[0066] Polyvinyl alcohol (PVA) components (degree of polymerization 500-2400, degree of hydrolysis 85%-99%, thickness 10μm-50μm) are water-soluble polymers. Their dissolution mechanism depends on the interaction between the material's molecular chains and water molecules (from trace amounts of water in the electrolyte or specific organic solvents). By controlling its degree of polymerization, degree of hydrolysis, and film thickness, separators 200 that gradually dissolve within hours (e.g., 4-8 hours) to days (e.g., 3-7 days) can be designed. The advantage is that the dissolution process is stable and controllable, and the dissolution rate can be precisely adjusted over a wide range through material modification. When using PVA components, an aqueous electrolyte, such as a lead-acid battery or an alkaline battery, must be used.

[0067] Polycaprolactone (molecular weight 50,000 Da-80,000 Da, thickness 20 μm-100 μm) dissolves over time through hydrolytic degradation. It is a biodegradable aliphatic polyester whose ester bonds break slowly in the electrolyte environment, causing the film to gradually thin until it perforates. Its advantage is that the degradation rate is slow and linear, making it very suitable for applications that require long-term (such as several weeks or even 1-3 months) stable delay. When using polycaprolactone, an aqueous electrolyte such as lead-acid or alkaline batteries must be used.

[0068] Modified fiber components (such as hydroxypropyl methylcellulose, degree of substitution 0.8-1.5, viscosity) (Thickness 15μm-60μm) can also achieve timed function by absorbing water, swelling and dissolving. Its advantages are that the raw materials are widely available and have good biocompatibility. The dissolution time (e.g., 12 hours-5 days) can be finely controlled by changing the degree of substitution and film density. When modified fiber parts are used, the electrolyte must be an aqueous electrolyte, such as lead-acid battery or alkaline battery.

[0069] The dissolution / degradation rate of these materials is mainly determined by their chemical structure (such as the stability of ester bonds and ether bonds) and environmental conditions (temperature, humidity, pH value). Through material selection and modification, they can be degraded at a predetermined rate under normal storage and transportation conditions (such as 25°C), while the degradation will be accelerated at high temperatures. Therefore, the thermal impact on the housing 100 of the soft-pack battery cell will not occur, ensuring the integrity of the housing 100.

[0070] like Figure 4 As shown, the separator 200 includes a separator 210 and a connecting part 220. The connecting part 220 is arranged circumferentially along the separator 210. One side of the connecting part 220 is connected to the separator 210, and the other side of the connecting part 220 is connected to the inner wall of the housing 100.

[0071] In some embodiments, the thickness of the connecting portion 220 is less than the thickness of the separating portion 210.

[0072] By adopting the above technical solution, by making the thickness of the connecting part 220 less than the thickness of the partition part 210, the connecting part 220 becomes a preset and controllable weak point. Under the conditions of external force, preset temperature and preset time, the connecting part 220 can break or dissolve first, achieving a more reliable trigger response. It can also control the behavior of the partition 200 when it detaches, avoiding irregular tearing and blocking the communication channel between the first cavity 110 and the second cavity 120.

[0073] like Figure 5 As shown, in some embodiments, the connecting portion 220 is provided with a recess 221 along the circumference of the connecting portion 220.

[0074] In this embodiment, the dent 221 is a laser scratch.

[0075] By adopting the above technical solution, a groove 221 is provided on the connecting part 220 along the circumference of the connecting part 220 for guidance. The cracking path and range of the separator 200 can be preset and controlled. The laser scratch, as a precision mechanical weak zone with consistent depth and shape, can ensure that when triggered by external force, preset temperature or preset time, stress is concentrated here and the separator 200 is guided to crack neatly and quickly along this predetermined trajectory, thereby achieving complete separation from the inner wall of the housing 100. This prevents unpredictable and localized tearing or blockage of the separator 200 due to uneven strength, and improves the reliability and consistency of the triggering action.

[0076] like Figure 6 As shown, in some embodiments, the thickness of the connecting portion 220 is less than the thickness of the separating portion 210, and a recess 221 is provided on the connecting portion 220 along the circumference of the connecting portion 220.

[0077] Combination Figure 1, Figure 2 and Figure 3 The soft-pack battery cell also includes a protective film 300, which is connected to the outer wall of the housing 100 and is arranged along the circumference of the separator 200.

[0078] In this embodiment, a bright yellow or high-temperature resistant polyimide tape with warning text can be used as the protective film 300. The polyimide tape has excellent high-temperature resistance and can adapt to the working environment of the battery cell without failure. In addition, the polyimide tape has high mechanical strength and a certain thickness, which can effectively disperse and buffer the point stress caused by accidental external physical contact or compression, and prevent the external force from being transmitted to the inner wall of the housing 100 and accidentally triggering the separator 200.

[0079] Combination Figure 1 , Figure 2 and Figure 3 The soft-pack battery cell also includes an exhaust valve 400, which is connected to the housing 100 and communicates with the first cavity 110.

[0080] By adopting the above technical solution, when the separator 200 fails and connects the first cavity 110 and the second cavity 120, the electrolyte can mix with the electrode core. When the electrolyte and the electrode core undergo a violent chemical reaction at the moment of activation, a large amount of gas is often generated, causing a sudden increase in internal pressure. At this time, the exhaust valve 400 will open precisely at the preset pressure to quickly discharge these gases out of the shell. This process can prevent serious safety problems such as bulging, tearing of the sealing edge, or even explosion of the soft-pack battery cell due to internal pressure accumulation. At the same time, by maintaining the internal pressure at a relatively stable level, the exhaust valve 400 also provides the necessary space and time to ensure the full and uniform wetting of the electrolyte and the electrode core, preventing the reaction process from being inhibited due to excessive pressure or the electrolyte from leaking from the sealing edge, and ultimately ensuring the reliability and safety of the soft-pack battery cell activation.

[0081] Combination Figure 7 and Figure 8 The housing 100 is provided with a replacement port 500, which is connected to the second cavity 120. The housing 100 is detachably connected with an opening and closing plate 510 for opening and closing the replacement port 500.

[0082] By adopting the above technical solution and by setting the replacement port 500, it is convenient to replace the electrolyte bag or electrolyte in the second cavity 120, which extends the functional life of the battery cell and improves the flexibility of use. Without damaging the structural integrity of the shell 100, the aged, deteriorated or failed electrolyte after a specific reaction can be safely discharged and a newly prepared electrolyte can be injected or the pre-packaged electrolyte bag can be directly replaced.

[0083] In this embodiment, for scenarios requiring reuse, a combination of O-ring sealing and bolt fastening can be used. A fluororubber O-ring resistant to electrolyte corrosion is embedded in the opening / closing plate 510, and bolts are threaded through the opening / closing plate 510 and connected to the housing 100, thus achieving a seal between the opening / closing plate 510 and the housing 100. Disassembly can be performed simply by loosening the bolts with a tool. For scenarios not requiring reuse, laser welding can be used to fuse the opening / closing plate 510 and the replacement port 500 together to form a permanent seal. Disassembly requires mechanical cutting or tearing to destroy the weld points. Alternatively, a pre-applied hot melt adhesive or sealant can be used, where heating or applying pressure bonds the opening / closing plate 510 to the housing 100. Disassembly can be performed by localized heating or physical prying.

[0084] This application also provides an electronic device, including a device body and a pouch cell from any of the above embodiments connected to the device body.

[0085] The specific structure of the pouch cell has been described in detail in the above embodiments and will not be repeated here.

[0086] In this embodiment, the electronic device is a mobile phone, tablet computer, or laptop computer; in other embodiments, the electronic device may also be a wireless Bluetooth headset, watch, or bracelet, etc.

[0087] The electronic device provided in this application, by setting up a soft-pack battery cell, provides a fast, direct and reliable emergency activation method when the soft-pack battery cell needs to be activated. When the housing 100 is subjected to external force, such as squeezing or crushing, the force will be transmitted through the housing 100 to the separator 200, causing the separator 200 to break. It is suitable for conditions that require rapid triggering of electrolyte and electrode core mixing. The whole process does not depend on temperature or time conditions and the response is extremely fast.

[0088] When the internal temperature of the battery cell or the ambient temperature reaches the preset temperature, the separator 200 will fail due to material melting, realizing intelligent thermal triggering. The battery cell is only activated when it reaches a specific temperature threshold, which is suitable for scenarios that require thermal management or overheat protection.

[0089] When the soft-pack battery cell reaches the preset time, the separator 200 will gradually dissolve in the electrolyte environment over time, achieving precise delayed activation. This is suitable for devices with fixed shelf life or those that need to be started at a time, simplifying the management process of logistics, storage and end use.

[0090] The first cavity 110 and the second cavity 120 can isolate the electrode core and the electrolyte, preventing chemical reactions between the electrode core and the electrolyte during the storage stage. This blocks the reaction path for the electrolyte to form an SEI film on the negative electrode surface, preventing the increase in lithium-ion transport resistance and irreversible capacity decay caused by the thickening of the SEI film, and extending the storage life of the cell. The separator 200 eliminates self-discharge and chemical side reactions of the soft-pack electrode core during the storage stage, making it suitable for scenarios such as emergency power supplies and military equipment that require long-term storage of soft-pack cells, indirectly improving the applicability of soft-pack cells.

[0091] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A pouch cell, characterized in that, include: Casing (100); A separator (200) is disposed within the housing (100). The separator (200) is used to divide the space within the housing (100) into a first cavity (110) and a second cavity (120). The first cavity (110) is used to accommodate the electrode core, and the second cavity (120) is used to accommodate the electrolyte or electrolyte bladder. The separator (200) is configured to be destructible to connect the first cavity (110) and the second cavity (120).

2. The soft-pack battery cell according to claim 1, characterized in that, The separator (200) is configured to break under the action of the external force to connect the first cavity (110) and the second cavity (120).

3. The soft-pack battery cell according to claim 2, characterized in that, The separator (200) is a polypropylene heat-sealing layer, an aluminum foil and PP co-extruded part, or a PET ceramic vapor-deposited PP part.

4. The soft-pack battery cell according to claim 1, characterized in that, The separator (200) is designed to dissolve and be destroyed at a temperature greater than or equal to the preset temperature, thereby connecting the first cavity (110) and the second cavity (120).

5. The soft-pack battery cell according to claim 4, characterized in that, The separator (200) is a thermoplastic polymer, a water-soluble film, a low-melting-point alloy, or a wax.

6. The soft-pack battery cell according to claim 1, characterized in that, The separator (200) is used to dissolve and be destroyed when the idle time is greater than or equal to a preset time, so as to connect the first cavity (110) and the second cavity (120).

7. The soft-pack battery cell according to claim 6, characterized in that, The separator (200) is a polyvinyl alcohol component, a polycaprolactone component, or a modified cellulose component.

8. The pouch cell according to any one of claims 1-7, characterized in that, The separator (200) includes a separator (210) and a connecting part (220). The connecting part (220) is arranged circumferentially along the separator (210). One side of the connecting part (220) is connected to the separator (210), and the other side of the connecting part (220) is connected to the inner wall of the housing (100).

9. The soft-pack battery cell according to claim 8, characterized in that, The thickness of the connecting portion (220) is less than the thickness of the separating portion (210), and / or, a recess (221) is provided on the connecting portion (220) along the circumferential direction.

10. The pouch cell according to any one of claims 1-7, characterized in that, It also includes a protective film (300) connected to the outer wall of the housing (100) and disposed along the circumference of the separator (200).

11. The pouch cell according to any one of claims 1-7, characterized in that, It also includes an exhaust valve (400), which is connected to the housing (100) and communicates with the first cavity (110).

12. The pouch cell according to any one of claims 1-7, characterized in that, The housing (100) is provided with a replacement port (500), which communicates with the second cavity (120). The housing (100) is detachably connected with an opening and closing plate (510) for opening and closing the replacement port (500).

13. An electronic device, characterized in that, The device includes the device body and the pouch cell according to any one of claims 1-12 connected to the device body.

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