Pouch battery and electric device

Abstract

The utility model belongs to battery technical field, concretely relates to a kind of soft package battery and electric equipment, wherein, the soft package battery includes packaging component, electric core body, pressure relief component and shell;The packaging component is connected in the inside of the shell;Installation cavity is equipped in the packaging component;The electric core body is connected in the inside of the installation cavity;Pressure relief hole is equipped on the shell;The outer side end of the packaging component away from the installation cavity is equipped with installation gap;One end of the pressure relief component is arranged in the inside of the installation gap;The other end of the pressure relief component passes through the pressure relief hole, and is connected to the pressure relief hole.The utility model can realize exhaust pressure relief function;Therefore, the stability and safety of use are improved.

Description

Technical Field

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

[0002] In recent years, the widespread use of electrical / electronic devices of all sizes, such as motor vehicles, personal computers, and portable telephones, has led to a rapid expansion in demand for high-capacity, high-output batteries. As a commonly used type of battery, pouch cells are encased in an outer casing (film) to prevent moisture and atmospheric intrusion.

[0003] However, in existing pouch batteries, the outer casing (film) of the cell is heat-sealed on three sides, and its structure lacks functions such as venting. When gas is generated in the cell, it will cause swelling, and gas channels / bubbles will block the ion pathway, causing a rapid decline in cell performance and potentially leading to an explosion due to increased internal pressure; thus reducing its stability and safety in use. Utility Model Content

[0004] The purpose of this invention is to provide a soft-pack battery that addresses the shortcomings of existing technologies by solving the technical problem that the existing packaging structure lacks venting and pressure relief functions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A pouch battery includes an encapsulation component, a cell body, a pressure relief component, and a housing; the encapsulation component is connected to the interior of the housing; the encapsulation component has a mounting cavity; the cell body is connected to the interior of the mounting cavity; the housing has a pressure relief hole; the outer end of the encapsulation component away from the mounting cavity has a mounting gap; one end of the pressure relief component is disposed inside the mounting gap; the other end of the pressure relief component passes through the pressure relief hole and is connected to the pressure relief hole.

[0007] Preferably, the encapsulation component includes a covering section, a first side-folding section, and a second side-folding section; the mounting cavity is disposed inside the covering section; one end of the first side-folding section is connected to the covering section; the other end of the first side-folding section is bent along the side surface of the covering section away from the mounting cavity; one end of the second side-folding section is connected to the covering section; the other end of the second side-folding section is bent along the side surface of the covering section away from the mounting cavity; and the mounting gap is formed between the first side-folding section and the second side-folding section.

[0008] Preferably, the pressure relief component has a pressure relief channel; and the pressure relief component includes a spiral section and a straight section connected to both ends of the spiral section; one of the straight sections is connected to the pressure relief hole; the other straight section is disposed inside the installation gap; and the pressure relief channel is disposed through the spiral section and the straight section.

[0009] Preferably, the inclination angle α formed between the channel of the spiral segment and the plane in which it lies satisfies: 10≤α≤20°.

[0010] Preferably, the inner wall of the spiral section and / or the straight section is provided with a heat-sensitive filling layer;

[0011] The thermosensitive filling layer is a nickel-titanium alloy material, a trans-polyisoprene / carbon nanotube composite material, or a photothermal responsive polypyrrole composite material.

[0012] Preferably, the packaging component includes a heat-shrinkable protective inner layer, a buffer layer, an intermediate protective layer, a barrier layer, and a protective outer layer stacked sequentially; the battery cell body is disposed on the inner side of the heat-shrinkable protective inner layer away from the buffer layer.

[0013] Preferably, the relationship between the thickness h1 of the heat-shrinkable protective inner layer, the thickness h2 of the buffer layer, the thickness h3 of the intermediate protective layer, the thickness h4 of the barrier layer, and the thickness h5 of the protective outer layer satisfies the following: h1:h2:h3:h4:h5:=1:(2.5~3.5):(0.6~1):(1.2~1.8):1;

[0014] And / or the thickness h2 of the buffer layer and the thickness h0 of the encapsulation component satisfy: h2 = h0 * A; A satisfies: 35% ≤ A ≤ 40%.

[0015] Preferably, the barrier layer is made of a material that restricts oxygen input;

[0016] And / or, the intermediate protective layer is made of an elastic recovery material;

[0017] The heat-shrinkable protective inner layer is made of shape memory polyurethane material or polycaprolactone-based shape memory polymer.

[0018] And / or, the buffer layer is selected from carbon nanofiber aerogel material or silica aerogel composite carbon fiber felt or metal-organic framework derived porous carbon.

[0019] And / or, the protective outer layer is selected from modified polyamide material, polyvinylidene fluoride-hexafluoropropylene copolymer, or liquid crystal polymer film.

[0020] Preferably, the material restricting oxygen input is yttrium oxide-stabilized zirconia material, metallized ceramic fiber mesh material, nano-montmorillonite material, or aramid composite membrane material;

[0021] And / or, the elastic recovery material is selected from disulfide-bonded polyurethane or furan / maleimide materials.

[0022] This utility model also discloses an electrical device, including the aforementioned soft-pack battery.

[0023] The beneficial effects of this utility model are that this technical solution uses a packaging component to thermally seal the battery cell body, and combines it with a pressure relief component assembled into the installation gap and pressure relief hole, thereby realizing the venting and pressure relief function of the packaging component; when the battery cell body expands, the venting operation of the pressure relief component and pressure relief hole ensures that the internal pressure is normal and avoids phenomena such as explosion; thus improving the stability and safety of use. Attached Figure Description

[0024] The following will refer to the appendix. Figures 1-5 This section describes the features, advantages, and technical effects of exemplary embodiments of the present invention.

[0025] Figure 1 This is a schematic diagram of the structure of a soft-pack battery according to an embodiment of the present invention;

[0026] Figure 2 This is a front view of a soft-pack battery according to an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of a pressure relief component according to an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the encapsulation film of a soft-pack battery according to an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the encapsulation film of a soft-pack battery according to an embodiment of the present invention.

[0030] In the diagram: 100-Encapsulation component; 101-Covering section; 102-First side fold section; 103-Second side fold section; 104-Installation gap; 106-Installation cavity; 200-Cell body; 300-Housing shell; 301-Pressure relief hole; 400-Pressure relief component; 410-Spiral section; 420-Straight section; 430-Thermosensitive filling layer; 1-Heat-shrink protective inner layer; 2-Buffer layer; 3-Intermediate protective layer; 4-Barrier layer; 5-Outer protective layer. Detailed Implementation

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is intended to particularly describe embodiments and not to limit the scope of this application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the embodiment description, "multiple" refers to two or more, unless otherwise specifically defined.

[0033] The term 'embodiment' means that a particular feature, structure, or characteristic described exists in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or multiple situations existing alone. In addition, the character " / " in this document generally indicates that the related objects before and after are in an "or" relationship.

[0035] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can also refer to a mechanical connection or an electrical connection. They can be directly connected or indirectly connected through an intermediate medium, manifesting as internal communication between two components or an interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0036] The following is in conjunction with the appendix Figures 1-5 The present invention will be described in further detail, but this is not intended to limit the scope of the present invention.

[0037] like Figure 1 and 2As shown, in one embodiment of this utility model, the soft-pack battery includes a packaging component 100, a cell body 200, a pressure relief component 400, and a housing 300. The packaging component 100 is connected to the interior of the housing 300. A mounting cavity 106 is provided inside the packaging component 100. The cell body 200 is connected to the interior of the mounting cavity 106. A pressure relief hole 301 is provided on the housing 300. An installation gap 104 is provided at the outer end of the packaging component 100 away from the mounting cavity 106. One end of the pressure relief component 400 is disposed inside the installation gap 104. The other end of the pressure relief component 400 passes through the pressure relief hole 301 and is connected to the pressure relief hole 301. During assembly, when the pressure relief component 400 is assembled into the installation gap 104, the packaging component 100 and the pressure relief component 400 are then heat-sealed to reduce the installation gap 104 and promote a compact assembly.

[0038] The technical solution of this utility model is to heat-seal the battery cell body with the encapsulation component, and combine the pressure relief component with the installation gap and pressure relief hole to realize the venting and pressure relief function of the encapsulation component; when the battery cell body expands, the venting operation of the pressure relief component and pressure relief hole ensures that the internal pressure is normal and avoids phenomena such as explosion; thus improving the stability and safety of use.

[0039] Specifically, in some implementations, such as Figure 1 As shown, the distance D between the encapsulation component 100 and the housing 300 satisfies: 3.5mm ≥ D ≥ 1.5mm; it can be 1.5mm, 2.5mm, 3.0mm, 3.5mm, etc.; preferably 3mm. This structure can prevent the housing 300 from cracking due to stamping; and ensure the assembly stability of the battery cell body and the encapsulation component 100.

[0040] Specifically, in some implementations, such as Figure 1 and 2As shown, the encapsulation component 100 includes a covering section 101, a first side-folded section 102, and a second side-folded section 103; a mounting cavity 106 is disposed inside the covering section 101; one end of the first side-folded section 102 is connected to the covering section 101 and is disposed at an opening on one side of the mounting cavity 106; the other end of the first side-folded section 102 is bent along the surface of the covering section 101 away from the mounting cavity 106, and the other end of the first side-folded section 102 is bent along the thickness of the encapsulation component 100. The first side fold 102 extends in the (BB direction); one end of the second side fold 103 is connected to the covering section 101 and is located at one side opening of the mounting cavity 106; the other end of the second side fold 103 is bent along the surface of the covering section 101 away from the mounting cavity 106, and the other end of the first side fold 102 extends along the thickness direction (BB direction) of the encapsulation component 100; and the mounting gap 104 is formed between the first side fold 102 and the second side fold 103. This structure adds a pressure relief component 400 inside the encapsulation component 100 through asymmetric three-dimensional encapsulation to achieve rapid pressure relief and venting operation; thereby improving the safety and stability of use.

[0041] Specifically, in some implementations, such as Figure 2 and 3 As shown, the pressure relief component 400 has a pressure relief channel; and the pressure relief component 400 includes a spiral section 410 and a straight section 420 connected to both ends of the spiral section 410; one straight section 420 is connected to the pressure relief hole 301; the other straight section 420 is disposed in the installation gap 104; and the pressure relief channel passes through the spiral section 410 and the straight section 420. This structure, by setting a spiral pressure relief channel at the edge of the package, triggers directional pressure relief when the internal pressure is >1.5MPa, thereby improving the pressure relief speed and enhancing the safety of use.

[0042] Specifically, in some implementations, such as Figure 3 As shown, the inner walls of the spiral section 410 and / or the straight section 420 are provided with a thermosensitive filling layer 430. That is, a thermosensitive filling layer 430 is provided inside the pressure relief channel. The thermosensitive filling layer 430 is made of nickel-titanium alloy (NiTiNb ternary shape memory alloy), or trans-polyisoprene / carbon nanotube composite material, or Cu-Al-Mn high-temperature shape memory alloy, or liquid crystal elastomer (LCE), or photothermal responsive polypyrrole composite material. Preferably, it is made of nickel-titanium alloy (NiTiNb ternary shape memory alloy). In other words, when the internal thermal pressure of the cell body 200 reaches a preset value, the nickel-titanium alloy material will automatically contract to achieve rapid pressure relief; after pressure relief is completed, when the temperature and pressure are lower than the preset values, the nickel-titanium alloy material will automatically seal.

[0043] Specifically, in some implementations, such as Figure 3As shown, the inclination angle α formed between the channel of the helical segment 410 and the plane it lies in satisfies: 10≤α≤20°; and the diameter of the channel of the helical segment 410 satisfies: 0.10±0.02mm (too small and it will easily clog, too large and it will prematurely depressurize); the length L of the helical segment 410 satisfies: L=3.5×√C (C is the electrode area in cm²) 2 The angle is preferably 15°. This structure ensures pressure relief speed and operational stability through the channel of the helical segment 410 with a suitable tilt angle.

[0044] Specifically, in some implementations, such as Figure 1 , 2 As shown in Figure 4, the encapsulation component 100 includes a heat-shrinkable protective inner layer 1, a buffer layer 2, an intermediate protective layer 3, a barrier layer 4, and a protective outer layer 5, which are stacked sequentially. The battery cell body 200 is disposed on the inner side of the heat-shrinkable protective inner layer 1 away from the buffer layer 2. Through the heat-shrinkable sealing protection of the heat-shrinkable protective inner layer, the buffering effect of the buffer layer, the secondary protection effect of the intermediate protective layer, the barrier effect of the barrier layer, and the protection effect of the protective outer layer against the external environment, the sealing performance and impact resistance of the encapsulation component are effectively improved. Furthermore, combined with the outermost protective performance of the upper shell for the encapsulation component and the battery cell body, the impact resistance and sealing performance of the battery cell body are further improved to avoid phenomena such as explosions, thus ensuring its stability and safety in use. Furthermore, the other end of the pressure relief component 400 is disposed between the buffer layer 2 in the first side fold 102 and the buffer layer 2 in the second side fold 103. This structure ensures that the heat-shrinkable protective inner layer 1 of the aerogel material is destroyed at a higher priority than the barrier layer 4 of the metallized ceramic fiber mesh material because the other end of the pressure relief component 400 does not penetrate the heat-shrinkable protective inner layer 1. This accelerates the pressure relief speed and ensures the safety of the structure.

[0045] Specifically, in some implementations, such as Figure 4 and 5 As shown, the relationship between the thickness h1 of the heat-shrinkable inner protective layer 1, the thickness h2 of the buffer layer 2, the thickness h3 of the intermediate protective layer 3, the thickness h4 of the barrier layer 4, and the thickness h5 of the outer protective layer 5 satisfies h1:h2:h3:h4:h5:=1:(2.5~3.5):(0.6~1):(1.2~1.8):1. This structure achieves overall structural compactness and ensures overall protective effect through appropriate thickness ratios of each layer. Furthermore, in some embodiments, such as… Figure 2 and 3As shown, the thickness h0 of the encapsulation component 100 satisfies: 80μm ≤ h0 ≤ 150μm; it can be 80μm, 90μm, 92μm, 100μm, 110μm, 105μm, 120μm, 150μm, etc.; preferably 120μm. Furthermore, in some embodiments, such as... Figure 2 and 3 As shown, the thickness h4 of the barrier layer 4 satisfies: 20μm ≤ h4 ≤ 25μm; it can be 20μm, 21μm, 22μm, 23μm, 24μm, 24.5μm, 25μm, etc.; preferably 20μm. This structure, with a barrier layer 4 of suitable thickness, ensures overall structural compactness and its oxygen barrier effect. Furthermore, in some embodiments, such as... Figure 4 and 5 As shown, the thickness h1 of the heat-shrinkable protective inner layer 1 satisfies: 15μm ≤ h1 ≤ 20μm; it can be 15μm, 15.5μm, 16μm, 15.5μm, 18μm, 19μm, 20μm, etc.; preferably 20μm. This structure, with a heat-shrinkable protective inner layer 1 of suitable thickness, can ensure the overall structural compactness and its heat-shrinkable sealing protection function. Furthermore, in some embodiments, such as Figure 4 and 5 As shown, the thickness h3 of the intermediate protective layer 3 satisfies: 10μm ≤ h3 ≤ 15μm; it can be 10μm, 11.5μm, 13μm, 14μm, 15μm, 14.5μm, etc.; preferably 15μm. This structure, with its appropriately thick intermediate protective layer 3, ensures overall structural compactness and its secondary protective function. Furthermore, in some embodiments, such as... Figure 4 and 5 As shown, the thickness h5 of the outer protective layer 5 satisfies: 15μm≤h3≤20μm; it can be 15μm, 15.5μm, 16μm, 17μm, 18μm, 20μm, etc.; preferably 20μm. This structure, through the intermediate protective layer 3 with a suitable thickness value, can ensure the overall structural compactness and its secondary protective function.

[0046] In some implementation methods, such as Figure 4 and 5As shown, the thickness h2 of the buffer layer 2 satisfies: 40μm ≤ h2 ≤ 50μm; it can be 41μm, 41.5μm, 42μm, 44μm, 46μm, 48μm, 50μm, etc.; preferably 45μm. This structure, with a buffer layer 2 of suitable thickness, ensures overall structural compactness and its function of buffering external stress. Furthermore, the thickness h2 of the buffer layer 2 and the thickness h0 of the encapsulation component 100 satisfy: h2 = h0 * A; where A satisfies: 35% ≤ A ≤ 40%. This structure, with a buffer layer 2 and encapsulation component 100 of suitable thickness ratio, can achieve a multi-stage energy absorption structure and a compressive modulus of 0.8-1.2MPa, thereby ensuring its secondary protective function.

[0047] Specifically, in some embodiments, the barrier layer 4 is made of a material that restricts oxygen input. Further, the material restricting oxygen input can be yttrium-stabilized zirconia, metallized ceramic fiber mesh, nano-montmorillonite, or aramid composite membrane. This structure, using yttrium-stabilized zirconia, metallized ceramic fiber mesh, nano-montmorillonite, or aramid composite membrane, can effectively reduce excessive external oxygen penetration, preventing explosions and other phenomena; thus, it helps ensure the stability and safety of its use. Preferably, the material restricting oxygen input is a metallized ceramic fiber mesh; further, the mesh density of the metallized ceramic fiber mesh is 300 to 400 mesh, thereby achieving an oxygen permeability of <

[0048] 0.05cc / m 2 • day; and the puncture strength is >50N / mm; thereby further improving the stability and safety of use.

[0049] Specifically, in some embodiments, the intermediate protective layer 3 is made of an elastic recovery material. This elastic recovery material may be a disulfide-bonded polyurethane or a furan / maleimide material, etc. Disulfide-bonded polyurethane is preferred; this achieves room temperature self-healing (crack healing rate 92% @ 24h) and UV-triggered disulfide bond recombination, thereby providing secondary protection.

[0050] Specifically, in some embodiments, the heat-shrinkable protective inner layer 1 is made of shape memory polyurethane material or polycaprolactone-based shape memory polymer, etc. Shape memory polyurethane material is preferred; this achieves heat-triggered self-shrinkage (shrinkage rate > 38% at 60°C), thereby suppressing gas expansion; and thus achieving a heat-shrinkable sealing and protective function.

[0051] Specifically, in some embodiments, the buffer layer 2 is selected from carbon nanofiber aerogel material, silica aerogel composite carbon fiber felt, or metal-organic framework (MOF) derived porous carbon. Carbon nanofiber aerogel material is preferred to achieve a multi-level energy-absorbing structure and a compressive modulus of 0.8-1.2 MPa, as well as thermal anisotropy (in-plane >20 W / mK, out-of-plane <0.5 W / mK); thereby ensuring its secondary protective function.

[0052] Specifically, in some embodiments, the protective outer layer 5 is selected from modified polyamide materials, polyvinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP), or liquid crystal polymer (LCP) films. Modified polyamide materials are preferred; wherein the modified polyamide material is a modified polyamide-polyurea resin or a light-colored modified polyamide material for VT6510 transparent adhesive; to achieve a water vapor transmission rate of <0.1 g / m³. 2 ·day and surface resistance satisfy 10 6 -10 8 Ω (antistatic); thus, the outermost protective layer ensures the stability and safety of its use.

[0053] The battery cell body 200 includes a positive electrode, a negative electrode, and a separator. The positive electrode includes a positive current collector and a positive active material layer, the latter coated on the surface of the current collector. The current collector can be made of aluminum, and the active material layer includes a positive active material, such as lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode includes a negative current collector and a negative active material layer, the latter coated on the surface of the current collector. The current collector can be made of copper, and the active material layer includes a negative active material, such as carbon or silicon. The separator can be made of PP (polypropylene) or PE (polyethylene).

[0054] This utility model also proposes an electrical device, which includes a soft-pack battery. The specific structure of the soft-pack battery is as described in the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0055] The electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose special limitations on the above-mentioned electrical equipment.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0057] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments described above, and any obvious improvements, substitutions, or modifications made by those skilled in the art based on this utility model are within the protection scope of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A soft-pack battery, characterized in that: The device includes a packaging component, a battery cell body, a pressure relief component, and a housing. The packaging component is connected to the interior of the housing. The packaging component has a mounting cavity. The battery cell body is connected to the interior of the mounting cavity. The housing has a pressure relief hole. The outer end of the packaging component away from the mounting cavity has a mounting gap. One end of the pressure relief component is located inside the mounting gap. The other end of the pressure relief component passes through the pressure relief hole and is connected to the pressure relief hole.

2. The soft-pack battery according to claim 1, characterized in that: The encapsulation component includes a covering section, a first side-folding section, and a second side-folding section; the mounting cavity is disposed inside the covering section; one end of the first side-folding section is connected to the covering section; the other end of the first side-folding section is bent along the side surface of the covering section away from the mounting cavity; one end of the second side-folding section is connected to the covering section; the other end of the second side-folding section is bent along the side surface of the covering section away from the mounting cavity; and the mounting gap is formed between the first side-folding section and the second side-folding section.

3. The soft-pack battery according to claim 2, characterized in that: The pressure relief component is provided with a pressure relief channel; and the pressure relief component includes a spiral section and a straight section connected to both ends of the spiral section; one of the straight sections is connected to the pressure relief hole; the other straight section is disposed inside the installation gap; and the pressure relief channel is disposed through the spiral section and the straight section.

4. The soft-pack battery according to claim 3, characterized in that: The inclination angle α formed between the channel of the spiral segment and the plane in which it lies satisfies: 10≤α≤20°.

5. The soft-pack battery according to claim 3, characterized in that: The inner wall of the spiral section and / or the straight section is provided with a heat-sensitive filling layer; The thermosensitive filling layer is a nickel-titanium alloy material, a trans-polyisoprene / carbon nanotube composite material, or a photothermal responsive polypyrrole composite material.

6. The soft-pack battery according to claim 1, characterized in that: The encapsulation component includes a heat-shrinkable protective inner layer, a buffer layer, an intermediate protective layer, a barrier layer, and a protective outer layer stacked in sequence; the battery cell body is disposed on the inner side of the heat-shrinkable protective inner layer away from the buffer layer.

7. The soft-pack battery according to claim 6, characterized in that: The relationship between the thickness h1 of the heat-shrinkable inner protective layer, the thickness h2 of the buffer layer, the thickness h3 of the intermediate protective layer, the thickness h4 of the barrier layer, and the thickness h5 of the outer protective layer satisfies the following: h1:h2:h3:h4:h5:=1:(2.5~3.5):(0.6~1):(1.2~1.8):1; And / or the thickness h2 of the buffer layer and the thickness h0 of the encapsulation component satisfy: h2 = h0 * A; A satisfies: 35% ≤ A ≤ 40%.

8. The pouch cell battery according to claim 6 or 7, characterized in that: The barrier layer is made of a material that restricts oxygen input; And / or, the intermediate protective layer is made of an elastic recovery material; And / or, the heat-shrinkable protective inner layer is made of shape memory polyurethane material or polycaprolactone-based shape memory polymer; And / or, the buffer layer is selected from carbon nanofiber aerogel material or silica aerogel composite carbon fiber felt or metal-organic framework derived porous carbon. And / or, the protective outer layer is selected from modified polyamide material, polyvinylidene fluoride-hexafluoropropylene copolymer, or liquid crystal polymer film.

9. The soft-pack battery according to claim 8, characterized in that: The material that restricts oxygen input is yttrium-stabilized zirconium oxide material, metallized ceramic fiber mesh material, nano-montmorillonite material, or aramid composite membrane material. And / or, the elastic recovery material is selected from disulfide-bonded polyurethane or furan / maleimide materials.

10. An electrical appliance, characterized in that: Includes the pouch cell battery as described in any one of claims 1 to 9.

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