Pouch cell and power consuming device

Abstract

The utility model provides a kind of soft package battery and electric device, including shell, shell includes the main part of accommodating electric core, and the flange edge connected to main part, flange edge is set along the direction of deviating from electric core and protrudes main part, along the direction of deviating from electric core, shell sequentially includes first inner insulating layer, second metal layer and third outer insulating layer, flange edge includes first sealing edge, weak part and second sealing edge, first sealing edge and second sealing edge intersect and connect, and the connecting place of both is provided with weak part, and the side of weak part away from main part forms notch;On the horizontal plane of shell, the width of first sealing edge is d1mm, the width of second sealing edge is d2mm, the minimum width of weak part is d3mm, d3<d1, and d3<d2, the soft package battery can be oriented guidance in the pressure relief path when thermal runaway and discharge high-temperature gas.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a soft-pack battery and an electrical device. Background Technology

[0002] In related technologies, when a pouch battery experiences thermal runaway, it is necessary to promptly expel the high-temperature gas expanding inside the casing to achieve rapid pressure relief. However, pouch batteries are mostly made of composite metal and insulating materials, and are relatively thin, making it difficult to install pressure relief valves. This results in the inability to promptly and directionally relieve pressure inside the battery. Furthermore, the combination of other conductive components inside the pouch battery with the high-temperature gas can easily exacerbate thermal runaway, thereby greatly affecting the safety performance of the pouch battery. Utility Model Content

[0003] In view of this, the present invention provides a pouch battery and an electrical device that can directionally guide the pressure relief path and discharge high-temperature gas when the pouch battery experiences thermal runaway, thereby at least partially solving the above-mentioned technical problems.

[0004] This utility model provides a soft-pack battery, comprising: a casing, the casing including a main body portion for accommodating a battery cell, and a flange edge connected to the main body portion, the flange edge protruding from the main body portion in a direction away from the battery cell, the casing including a first inner insulating layer, a second metal layer and a third outer insulating layer in sequence in the direction away from the battery cell, the flange edge including a first sealing edge, a weak portion and a second sealing edge, the first sealing edge and the second sealing edge intersecting and connected, the weak portion being provided at the connection point, the weak portion forming a notch on the side away from the main body portion; on the horizontal plane of the casing, the width of the first sealing edge is d1mm, the width of the second sealing edge is d2mm, the minimum width of the weak portion is d3mm, d3<d1, and d3<d2.

[0005] Through the above technical solution, namely the soft-pack battery provided by this utility model, in the event of thermal runaway, because a gap is formed on the side of the weak part away from the main body, that is, the weak part provides a position for directional pressure relief for the soft-pack battery, the high-temperature gas that expands inside the soft-pack battery due to thermal runaway can be discharged in a timely and directional manner through the weak part. In addition, on the horizontal plane of the shell, the width d3 of the weak part is smaller than the width d1 of the first sealing edge and the width d2 of the second sealing edge. The sealing performance of the shell at the weak part is relatively weaker than that of the first and second sealing edges. When thermal runaway occurs, this area of ​​the weak part can be preferentially opened by the expanding high-temperature gas, so that the high-temperature gas can be ejected from the weak part. Furthermore, because a gap is formed on the side of the weak part away from the main body, that is, the weak part is set at the corner of the first and second sealing edges, when the high-temperature gas is ejected from here, the high-temperature and high-pressure gas will not directly spray towards other adjacent batteries or electronic components. In this way, the possibility of the chain reaction of thermal runaway spreading and aggravating can be further reduced and controlled, which can significantly improve the safety performance of the soft-pack battery. Attached Figure Description

[0006] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0007] Figure 1 This is a schematic diagram of the outer casing structure of a soft-pack battery provided in an exemplary embodiment of this utility model; Figure 2 This is a front view of the outer casing of a soft-pack battery provided in an exemplary embodiment of the present invention; Figure 3 for Figure 2 A magnified view of a portion of position A in the middle; Figure 4 This is a schematic diagram of the side and internal structure of a soft-pack battery provided in an exemplary embodiment of the present utility model; Figure 5 for Figure 4 A magnified view of the area at position C in the middle; Figure 6 This is a schematic diagram of the structure of a soft-pack battery provided in an exemplary embodiment of this utility model; Figure 7 This is a top view of a soft-pack battery provided in an exemplary embodiment of the present utility model; Figure 8This is a schematic diagram of another embodiment of the soft-pack battery provided in an exemplary embodiment of this utility model; Figure 9 This is a top view of another embodiment of the soft-pack battery provided in the exemplary embodiments of this utility model; Figure 10 This is a top view of a third embodiment of the soft-pack battery provided in an exemplary embodiment of the present utility model; Figure 11 for Figure 10 A magnified view of a portion of position B in the middle; Figure 12 for Figure 2 A magnified view of the area at position A'.

[0008] Explanation of reference numerals in the attached figures: 1. Outer shell; 110. Main body; 120. Flange edge; 121. First sealing edge; 122. Second sealing edge; 123. Weak part; 1231. Inner end; 1232. Outer end; 124. Notch; 125. Second fillet; 126. First included angle; 127. Second included angle; 128. Third fillet; 129. First fillet; 130. First housing; 140. Second housing; 2. Polar ears; 3. Battery cells. Detailed Implementation

[0009] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0010] In related technologies, when a pouch battery experiences thermal runaway, it is necessary to promptly release the high-temperature gas expanding inside the casing to achieve rapid pressure relief. However, pouch batteries are usually sealed by hot-pressing the edges, making it difficult to install a pressure relief valve. This results in the inability to release pressure in a timely and directional manner inside the battery. Furthermore, the combination of other conductive components inside the pouch battery with the high-temperature gas can easily exacerbate thermal runaway, thereby greatly affecting the safety performance of the pouch battery.

[0011] Based on the above-mentioned technical problems, this utility model provides a soft-pack battery, as shown in the reference. Figures 1 to 12As shown, the soft-pack battery includes a casing 1, wherein the casing 1 includes a main body 110 for accommodating a battery cell 3, and a flange 120 connected to the main body 110. The flange 120 protrudes from the main body 110 in a direction away from the battery cell 3. In the direction away from the battery cell 3, the casing sequentially includes a first inner insulating layer, a second metal layer and a third outer insulating layer. The flange 120 includes a first sealing edge 121, a weak portion 123 and a second sealing edge 122. The first sealing edge 121 and the second sealing edge 122 intersect and are connected. A weak portion 123 is provided at the connection between the two. A notch 124 is formed on the side of the weak portion 123 away from the main body 110. On the horizontal plane of the casing 1, the width of the first sealing edge 121 is d1mm, the width of the second sealing edge 122 is d2mm, the minimum width of the weak portion 123 is d3mm, d3<d1 and d3<d2.

[0012] Through the above technical solution, namely the soft-pack battery provided by this utility model, in the event of thermal runaway, because the weak part 123 has a notch 124 formed on the side away from the main body 110, that is, the weak part 123 provides a position for directional pressure relief for the soft-pack battery, the high-temperature gas that expands inside the outer shell 1 due to thermal runaway can be discharged in a timely and directional manner through the weak part 123. Furthermore, on the horizontal plane of the outer shell 1, the width d3 of the weak part 123 is smaller than the width d1 of the first sealing edge 121 and the width d2 of the second sealing edge 122. The sealing performance of the outer shell 1 at the weak part 123 is better than that of the first sealing edge 121 and the second sealing edge 122. The edge seal 122 is also relatively weak. When thermal runaway occurs in the outer casing 1, the weak part 123 can be preferentially opened by the expanding high-temperature gas, so that the high-temperature gas can be ejected from the weak part 123. Furthermore, since a notch 124 is formed on the side of the weak part 123 away from the main body 110, that is, the weak part 123 is set at the corner of the first sealing edge 121 and the second sealing edge 122, when the high-temperature gas is ejected from here, the high-temperature and high-pressure gas will not directly spray towards other adjacent batteries or electronic components. This can further reduce and control the possibility of thermal runaway chain reaction and spread, and can significantly improve the safety performance of the soft pack battery.

[0013] Furthermore, in the above embodiments, when the first sealing edge 121 and the second sealing edge 122 are sealed in the outer casing 1 of the soft-pack battery, they are usually sealed separately. The sealing process generally employs a hot-pressing method, where the heat generated by the hot-pressing head causes the cast polypropylene film (CPP layer) on the inner layer of the first sealing edge 121 or the second sealing edge 122 to melt and fuse together, or to be bonded together by an adhesive layer, forming a sealing edge. The sealing edge can be a three-sided or four-sided seal. Therefore, after the mutually perpendicular first sealing edge 121 and the second sealing edge 122 are hot-pressed separately, the sealing edge is formed by... The corner at the junction of the first sealing edge 121 and the second sealing edge 122 is heat-pressed twice. That is, the corner is the weak part 123 before the notch 124 is formed. After the corner is heat-pressed twice, this area is thinner and weaker than the first sealing edge 121 and the second sealing edge 122. Therefore, setting the weak part 123 here can utilize the thinner CPP layer here, and then cut the notch 124 to make the width d3 of the weak part 123 narrower, thereby making the pressure relief guidance effect better, so as to achieve precise guidance of pressure relief and prevent the battery from depressurizing towards adjacent batteries or other electrical components, causing severe thermal runaway of the battery pack.

[0014] Furthermore, the first sealing edge 121 and the second sealing edge 122 mentioned in the above embodiments can be two opposing flange edges 120, and the opposing third outer insulating layers of the two can be sealed by adhesive bonding or heat fusion.

[0015] The first inner insulating layer, the second metal layer, and the third outer insulating layer constituting the outer casing 1 mentioned in the above embodiments can be made of materials that are relatively mature in the field of soft-pack batteries.

[0016] For example, the material of the third outer insulating layer can be one or more of the following: polycaprolactam (nylon 6), PET (polyethylene terephthalate), or polybutylene succinate.

[0017] The second metal layer can be one or more of the following metals or alloys: aluminum, aluminum alloy, copper, nickel, etc.

[0018] The first inner insulation layer can be one or more materials such as polypropylene film (PP) and cast polypropylene film (CPP).

[0019] In the field of soft-pack batteries, the most commonly used outer casing 1 is aluminum-plastic film, that is, the first inner insulating layer is polycaprolactam (nylon 6), the second metal layer is aluminum, and the first inner insulating layer is a polypropylene film (PP) or cast polypropylene film (CPP).

[0020] The third outer insulating layer is responsible for maintaining the shape stability of the outer shell 1, ensuring that the thin-film outer shell 1 will not deform during the lithium-ion battery manufacturing process.

[0021] The primary function of the metal layer is waterproofing. Lithium batteries are extremely sensitive to moisture, and the outer casing 1 must effectively prevent the intrusion of water vapor. The material of the third outer insulation layer is usually not waterproof and cannot meet this requirement. However, the metal layer, especially when aluminum is used, can react with oxygen in the air to form a dense oxide film, thereby preventing water vapor penetration and protecting the inside of the battery cell. In addition, the metal layer also provides the necessary plasticity during the molding process of the outer casing 1 to meet the requirements of the denting process.

[0022] The material of the first inner insulating layer described above has the properties of melting at high temperatures and being adhesive. The battery's thermal sealing process mainly relies on the first inner insulating layer melting and bonding together when the end cap is heated, followed by curing and bonding during cooling.

[0023] Furthermore, the weak part 123 mentioned in the above embodiments can be used to break through the weak part 123 after a certain air pressure is reached inside the soft-pack battery, thereby achieving directional pressure relief of the soft-pack battery.

[0024] The horizontal plane mentioned in the above embodiments can be understood as the large surface of the outer casing 1 of the pouch battery.

[0025] To facilitate understanding of the specific structure of the soft-pack battery of this utility model by those skilled in the art, the specific structure of the battery is described in this embodiment as follows.

[0026] A battery cell is the basic unit of a battery, typically consisting of a positive electrode, a negative electrode, and a separator. Lithium-ion battery cells primarily function by the movement of lithium ions between the positive and negative electrodes. In a cuboid battery cell, thin-film structures are wound or stacked into an electrode assembly with a roughly cuboid shape.

[0027] A positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is coated on at least one surface of the positive current collector and includes: a positive active material, a conductive agent, and a binder. The positive active material includes, but is not limited to, at least one of the following: lithium phosphates, lithium transition metal oxides and their respective modified compounds, or other conventional materials that can be used as positive electrode active materials in batteries. These positive active materials can be used alone or in combination. Lithium phosphates include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also abbreviated as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Lithium transition metal oxides include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also known as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0028] The positive electrode conductive agent includes, but is not limited to, one or more combinations of graphite, superconducting carbon, carbon black (such as acetylene black, Ketjen black, SuperP, etc.), carbon nanotubes, graphene and carbon nanofibers.

[0029] The positive electrode binder includes, but is not limited to, one or more combinations of polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), PVDF-tetrafluoroethylene-propylene terpolymer, PVDF-hexafluoropropylene-tetrafluoroethylene terpolymer, tetrafluoroethylene-hexafluoropropylene copolymer, fluorinated acrylate resin, styrene-butadiene rubber, polyacrylic acid, sodium polyacrylate, polyacrylamide, polyvinyl alcohol, sodium alginate, polymethacrylic acid, carboxymethyl chitosan, etc.

[0030] The negative electrode sheet includes a negative electrode current collector and a negative electrode active layer disposed on at least one surface of the negative electrode current collector. The negative electrode current collector is a conductive metal foil, which can be made of stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, copper, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.). The negative electrode active layer includes a negative electrode active material, a conductive agent, and a binder.

[0031] The negative electrode active material can be carbon-based materials such as graphite, porous carbon, hard carbon, soft carbon, and mesophase carbon microspheres, or silicon-based materials such as elemental silicon, silicon oxides, silicon-carbon composites, and silicon-nitrogen composites. The conductive agent can be conductive carbon black, carbon nanotubes, etc., and the binder can be styrene-butadiene rubber, polyacrylic acid, etc.

[0032] In some implementations, reference Figure 3 As shown, d1 and d3 satisfy 1mm≤d1-d3≤6mm; d2 and d3 satisfy 11mm≤d2-d3≤16mm.

[0033] By limiting the differences between d1 and d3 and / or d2 and d3, the following measures are taken: When the differences between d1 and d3 and / or d2 and d3 exceed the upper limit, the value of d3 may become too narrow, making the weak points 123 too fragile and increasing the risk of accidental valve opening during normal use of the pouch battery. Conversely, when the differences between d1 and d3 and / or d2 and d3 are less than the lower limit, the lengths of d1 and / or d2 may become too long, resulting in excessive unused space during subsequent integration of the pouch battery. Furthermore, the increased length of d1 and / or d2 can easily lead to a situation where the high-temperature gas expanding during thermal runaway of the soft-pack battery cannot be quickly discharged from the weak part 123. That is, after the weak part 123 is broken, it is necessary to open part of the first sealing edge 121 and the second sealing edge 122 to achieve rapid pressure relief, which affects the safety performance of the soft-pack battery. Therefore, considering all factors, setting the difference between d1 and d3 between 1mm and 6mm, and / or setting the difference between d2 and d3 between 11mm and 16mm is a relatively reasonable layout.

[0034] Furthermore, the difference between d1 and d3 can be any suitable value within the aforementioned range, such as 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, etc., or any suitable value between any two adjacent values. Similarly, the difference between d2 and d3 can also be any suitable value within the aforementioned range, such as 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, etc., or any suitable value between any two adjacent values. This embodiment does not impose any further limitations on this.

[0035] In some implementations, reference Figures 3 to 11 As shown, the soft-pack battery also includes a tab 2 electrically connected to the cell 3. The first sealing edge 121 is provided with a lead-out hole. The tab 2 passes through the lead-out hole and extends outward. The tab 2 is sealed to the lead-out hole.

[0036] In this way, when the soft-pack battery is packaged, an outlet hole for the tab 2 can be pre-reserved on the first sealing edge 121. In this way, after the outer shell 1 of the soft-pack battery is packaged, the tab 2 can be normally led out from the outlet hole.

[0037] It should be noted that when there are multiple or multiple groups of tabs 2, the tabs 2 can all be led out from the same side of the pouch battery, or they can be led out from opposite sides of the pouch battery. The appropriate lead-out method can be selected according to the specific position of the pouch battery in subsequent group arrangement. This embodiment does not limit this too much.

[0038] Furthermore, the tab 2 is usually used as the current output terminal of the pouch battery and is electrically connected to the current output terminal of the cell 3 of the pouch battery. The tab 2 can be an electrode sheet, or it can be formed by welding together at least two layers of current collectors that are not coated with active material and then leading out.

[0039] Furthermore, the aforementioned tab 2 and the first sealing edge 121 can be sealed together, and a sealing layer can be provided separately between them, or they can be sealed together by means of heat fusion or adhesive bonding.

[0040] In some implementations, reference Figures 1 to 3 As shown, the length direction of the second sealing edge 122 is parallel to the length direction of the horizontal plane, and the length direction of the first sealing edge 121 is parallel to the width direction of the horizontal plane.

[0041] In this way, the first sealing edge 121 and the second sealing edge 122 can be in a mutually perpendicular position on the horizontal plane, which can further improve the convenience of sealing when sealing soft-pack batteries.

[0042] In some implementations, reference Figure 3 As shown, the width d2 of the second sealing edge 122 is greater than the width d1 of the first sealing edge 121, and the width d1 of the first sealing edge 121 is greater than the width d3 of the weak part 123, that is, d2 > d1 > d3.

[0043] In combination with the above methods, since the first sealing edge 121 is the lead-out end of the tab 2, after the first sealing edge 121 is hot-pressed, it cannot be bent again due to the presence of the tab 2. If the width d1 of the first sealing edge 121 is too long, the tab 2 and the conductive sheet welded to the tab 2 will also need to be longer. In the above case, there will be many negative problems due to the increased internal resistance, increased flow, and increased cost caused by the length of the current path. The width d2 of the second sealing edge 122 is the largest value among the above three values ​​because the sealing edge of the second sealing edge 122 does not involve the tab 2. Therefore, after the second sealing edge 122 is hot-pressed, it can be bent twice to hide the aluminum and other materials exposed at the edge of the outer shell 1. On the one hand, it can improve the aesthetics, and on the other hand, it can avoid the aluminum and other metal materials from colliding and short-circuiting with other electrical components.

[0044] In some implementations, reference Figure 3 As shown, the difference between the width d2 of the second sealing edge 122 and the width d1 of the first sealing edge 121, i.e., d2-d1, satisfies 10mm≤d2-d1≤20mm, and the ratio of the width d2 of the second sealing edge 122 to the width d1 of the first sealing edge 121, i.e., d2 / d1, satisfies 1.5≤d2 / d1≤5.

[0045] By limiting the range of the difference and ratio of d2 and d1, as described above, when the difference between d2 and d1 is too small and the ratio of d2 and d1 approaches 1, the widths of the first sealing edge 121 and the second sealing edge 122 are likely to be similar. Furthermore, if the width of the first sealing edge 121 is small, the width of the second sealing edge 122 may also be small and unable to be bent, potentially leading to short circuits with other electronic components. Moreover, compared to the second sealing edge 122, the first sealing edge 121 becomes a more significant weak point, making it more susceptible to thermal runaway in the case of the soft-pack battery. The first sealing edge 121 is prone to bursting open, which affects the safety of the soft-pack battery. When the difference between d2 and d1 is too large, and the ratio of d2 to d1 is too different from 1, the second sealing edge 122 may become too wide and occupy too much space, especially when the width of the first sealing edge 121 is small. Therefore, considering all factors, the difference between d2 and d1 is set between 10mm and 20mm, and / or the ratio of d2 to d1 is set between 1.5 and 5. This can reduce the possibility of the first sealing edge 121 being too short and bursting open, and also reduce the possibility of the second sealing edge 122 being too wide and occupying too much space.

[0046] It should be noted that the difference between d2 and d1 can be any suitable value between 10mm and 20mm, such as 10mm, 12mm, 15mm, 18mm, 20mm, etc., or any suitable value between any two adjacent values. This embodiment does not impose any restrictions on this.

[0047] The ratio of d2 to d1 can be any suitable ratio between 1.5 and 5, such as 1.5, 2, 3, 4, 4.5, 5, etc., or any suitable value between any two adjacent values ​​mentioned above. This embodiment does not impose any restrictions on this.

[0048] In some implementations, reference Figures 1 to 3 As shown, the weak portion 123 includes an inner end 1231 and an outer end 1232. The inner end 1231 is located on the side closer to the main body portion 110, and the outer end 1232 is located on the side away from the main body portion 110. The inner end 1231 is closer to the battery cell 3 than the inner edge of the first sealing edge 121 and / or the inner edge of the second sealing edge 122.

[0049] In this arrangement, the distance between the inner end 1231 of the weak portion 123 and the cell 3 is closer to the cell 3 than the inner edge of the first sealing edge 121 and / or the inner edge of the second sealing edge 122. Under this arrangement, when thermal runaway occurs inside the outer casing 1 of the pouch battery, the expanding high-temperature gas can contact the inner end 1231 of the weak portion 123 more quickly because the inner end 1231 is closer to the cell 3. This allows the weak portion 123 to be damaged more quickly, so that the high-temperature gas can be discharged from the weak portion 123 more quickly. This improves the directional pressure relief function of the pouch battery and can prevent the further spread of thermal runaway.

[0050] In some implementations, reference Figures 1 to 3 As shown, the distance between cell 3 and inner end 1231 is greater than or equal to 1mm and less than or equal to 8mm.

[0051] By means of the above method, the distance between the inner end 1231 of the weak part 123 and the cell 3 is limited. When the distance between the inner end 1231 and the cell 3 is at the minimum value defined above, the exhaust path can be further reduced in the event of thermal runaway of the soft pack battery, and the proportion of the cell 3 in the main body 110 can be increased, thereby improving the energy density of the cell 3. When the distance between the inner end 1231 and the cell 3 is at the maximum value defined above, the sealing performance of the weak part 123 can be further improved, thereby preventing the weak part 123 from accidentally opening during daily use of the soft pack battery.

[0052] The specific size of the battery cell 3 and the inner terminal 1231 can be selected according to the actual situation, as long as they meet the above range. For example, they can be 1mm, 2mm, 4mm, 6mm, 8mm, etc., or any suitable value between any two adjacent values. This embodiment does not impose too many restrictions on this.

[0053] In some implementations, reference Figure 3 As shown, the length of the inner end 1231 is Lmm, and Lmm satisfies 10mm≤Lmm≤30mm.

[0054] By limiting the length L of the inner end 1231 as described above, the inner end 1231 needs to be long enough to ensure the size of the pressure relief area of ​​the weak part 123. If the length L of the inner end 1231 is less than the minimum value specified above, the pressure relief area is too small and the venting is too slow, which may cause the internal pressure of the outer casing 1 to be unable to be released quickly, causing other non-pressure relief areas to burst and rupture, which may lead to further spread of thermal runaway of the soft pack battery. When the length L of the inner end 1231 is greater than the maximum value specified above, the weak part 123 with the notch 124 may also occupy more space in the main body 110 inside the outer casing 1, which may cause the cell 3 placed in the main body 110 to be too small, affecting the overall energy density of the soft pack battery. Therefore, considering all factors, limiting the length L of the inner end 1231 to between 10mm and 30mm is a relatively reasonable range.

[0055] Furthermore, the length L can be any suitable size within the above-defined range, such as 10mm, 15mm, 20mm, 25mm, 30mm, etc., or any suitable size value between any two adjacent values ​​mentioned above. This embodiment does not impose any further limitations on this.

[0056] In some implementations, reference Figures 1 to 11 As shown, on the horizontal plane of the outer casing 1, the first sealing edge 121 is perpendicular to the second sealing edge 122, and the weak part 123 extends obliquely relative to the extension direction of the first sealing edge 121 and the second sealing edge 122, respectively.

[0057] In the above manner, the first sealing edge 121 and the second sealing edge 122 are perpendicular to each other, which satisfies the basic shape requirements of the outer casing 1 when the soft-pack battery uses a rectangular cell. The weak part 123 extends obliquely relative to the first sealing edge 121 and the second sealing edge 122 respectively. In the event of thermal runaway of the soft-pack battery, the function of rapid pressure relief can be achieved through the oblique weak part 123.

[0058] In some implementations, reference Figure 3 As shown, on the horizontal plane of the outer casing 1, the angle between the extension direction of the weak part 123 and the extension direction of the first sealing edge 121 is greater than or equal to 140° and less than or equal to 170°; the angle between the extension direction of the weak part 123 and the extension direction of the second sealing edge 122 is greater than or equal to 100° and less than or equal to 130°.

[0059] By limiting the range of the angle between the weak portion 123 and the first sealing edge 121 and the second sealing edge 122, the ejection direction of the weak portion 123 during thermal runaway of the pouch battery can be controlled. This reduces the damage caused by the high-temperature gas ejected during thermal runaway to adjacent normal batteries or electronic components, thus preventing further spread of thermal runaway. It should be noted that the angle between the weak portion 123 and the first sealing edge 121 is interdependent with the angle between the weak portion 123 and the second sealing edge 122. Specifically, when the angle between the weak portion 123 and the first sealing edge 121 changes... When the included angle increases, the included angle between the weak part 123 and the second sealing edge 122 will decrease. Conversely, when the included angle between the weak part 123 and the first sealing edge 121 decreases, the included angle between the weak part 123 and the second sealing edge 122 will also increase. Therefore, it is necessary to comprehensively consider the range of the two included angles in order to select the optimal orientation of the weak part 123 to reduce the spread of thermal runaway during valve spraying. At the same time, it is necessary to avoid the weak part 123 being too narrow due to the included angle being too small, which would easily lead to stress concentration and abnormal pressure relief. If the included angle is too large, the first sealing edge 121 and the second sealing edge 122 cannot achieve a good and reliable seal.

[0060] Furthermore, in the above embodiment, the angle between the extension direction of the weak portion 123 and the extension direction of the first sealing edge 121 can be understood as the angle between the inner edge and / or outer edge of the weak portion 123 and the extension direction of the first sealing edge 121, or as the first angle 126 described below; the angle between the extension direction of the weak portion 123 and the extension direction of the second sealing edge 122 can be understood as the angle between the inner edge and / or outer edge of the weak portion 123 and the extension direction of the second sealing edge 122, or as the second angle 127 described below.

[0061] Furthermore, in the above embodiment, the angle between the extension direction of the weak portion 123 and the extension direction of the first sealing edge 121 can be any suitable size selected between 140° and 170°, such as 140°, 150°, 160°, 170°, or any size between any two adjacent values ​​mentioned above; the angle between the extension direction of the weak portion 123 and the extension direction of the second sealing edge 122 can also be any suitable size selected between 100° and 130°, such as 100°, 110°, 120°, 130°, etc., or any suitable size between any two adjacent values ​​mentioned above.

[0062] In some implementations, combined Figure 2 and Figure 3As shown, the length of the inner end 1231 is Lmm, and the length of the first sealing edge 121 on the horizontal plane of the outer shell 1 is L1mm, and L1 / L satisfies 2.3≤L1 / L≤14; and / or, the length of the second sealing edge 122 on the horizontal plane of the outer shell 1 is L2mm, and L2 / L satisfies 8≤L2 / L≤79.

[0063] In the above manner, L1 can represent the length of the pouch battery, and L2 can represent the width of the pouch battery. By limiting the range of L1 / L and / or L2 / L, pouch batteries of different sizes need to correspond to weak parts 123 of different sizes, which can meet the corresponding venting volume during thermal runaway, while preventing the size ratio from being too large, affecting the structural strength of the first sealing edge 121 and the second sealing edge 122; if the size ratio is too small, the stress is too concentrated, and the weak part 123 is prone to abnormal pressure leakage.

[0064] The actual value of L1 / L can be any suitable value within the range, such as 2.3, 3, 5, 7, 10, 14, etc., or any suitable value between any two adjacent values. This embodiment does not impose any restrictions on this.

[0065] The actual value of L2 / L can be any suitable value within the range, such as 8, 10, 20, 40, 60, 70, 79, etc., or any suitable value between any two adjacent values. This embodiment does not impose any restrictions on this.

[0066] In some implementations, reference Figures 4 to 11 As shown, in the length extension direction of the first sealing edge 121, the distance between the tab 2 and the weak part 123 is d4mm, where d4mm ≥ 5mm.

[0067] By limiting the distance between the tab 2 and the weak part 123 along the length extension direction of the first sealing edge 121 as described above, when the distance between the tab 2 and the weak part 123 is less than the minimum value defined above, the tab 2 of the pouch battery, as the battery current output terminal, generates a lot of heat during normal operation. The heat generated can easily cause the CPP layer at the weak part 123 to heat up and decrease in strength, leading to abnormal pressure leakage at the weak part 123. Therefore, by controlling the minimum distance between the tab 2 and the weak part 123 to be greater than or equal to 5mm, the pouch battery can be guaranteed that the strength of the weak part 123 will not decrease due to the heat generated by the tab 2 during normal operation. This can reduce or prevent leakage at the weak part 123 under normal operating conditions, improve the safety performance of the pouch battery during normal operation, and avoid excessive distance affecting the current flow area of ​​the tab 2, causing heat concentration at the tab and leading to sealing failure at the tab.

[0068] The value of d4 can be selected as 5mm, 6mm, 7mm, 10mm, etc., or it can be a larger value, or it can be a suitable value between any two adjacent values. This embodiment does not impose too many restrictions on this.

[0069] In some implementations, reference Figure 3 As shown, a first rounded corner 129 is provided between the outer end 1232 of the weak part 123 and the first sealing edge 121, and the radius r1mm of the first rounded corner 129 satisfies 2mm≤r1≤8mm; and / or, a second rounded corner 125 is provided between the outer end 1232 of the weak part 123 and the second sealing edge 122, and the radius r2mm of the second rounded corner 125 satisfies 2mm≤r2≤8mm.

[0070] By limiting the range using the radius r1 of the first rounded corner 129 and / or the radius r2 of the second rounded corner 125 as described above, it is possible to prevent the area of ​​the first sealing edge 121 and / or the second sealing edge 122 from being reduced due to the rounded corner radius being too large, thereby improving the sealing performance of the first sealing edge 121 and / or the second sealing edge 122 for the soft-pack battery. It is also possible to prevent the soft-pack battery from having a sharp edge due to the rounded corner radius being too small, which could potentially scratch other electronic components.

[0071] Furthermore, the radius r1 of the first fillet 129 can be any suitable value between 2mm and 8mm, such as 2mm, 3mm, 5mm, 8mm, etc., or any suitable value between any two adjacent values ​​mentioned above. This embodiment does not impose any restrictions on this.

[0072] Similarly, the radius r2 of the second fillet 125 can be any suitable value between 2mm and 8mm, such as 2mm, 3mm, 5mm, 8mm, etc., or any suitable value between any two adjacent values ​​mentioned above. This embodiment does not impose too many restrictions on this.

[0073] In some implementations, reference Figures 3 to 5 As shown, on the horizontal plane of the outer casing 1, the first sealing edge 121 and the weak part 123 form a first included angle 126, and the second sealing edge 122 and the weak part 123 form a second included angle 127. The angle of the first included angle 126 is greater than the angle of the second included angle 127.

[0074] By defining the relationship between the first included angle 126 and the second included angle 127 as described above, it is considered that there will be a large gap between the lead-out tab 2 of the battery cell 3 and the outer casing 1. Figure 5The gap between the connection between the battery cell 3 and the tab 2 and the outer casing 1, and the small distance between the second sealing edge 122 and the battery cell 3, by limiting the angle of the first included angle 126 to be greater than the angle of the second included angle 127, can minimize the gap between the connection between the battery cell 3 and the tab 2 and the outer casing 1, thereby increasing the internal space of the outer casing 1 to accommodate a larger battery cell 3.

[0075] Furthermore, in conjunction with the above-described embodiments, refer to Figures 3 to 5 As shown, the angle of the first included angle 126 is a1, the angle of the second included angle 127 is a2, a1-a2 satisfies greater than or equal to 10° and less than or equal to 70°; and / or, a1 / a2 satisfies 1.07≤a1 / a2≤1.7.

[0076] By limiting the angle difference and / or ratio of the first included angle 126 and the second included angle 127 as described above, when the difference between a1 and a2 is less than the minimum value, that is, when the angles of the first included angle 126 and the second included angle 127 are close, the angles formed by the weak part 123 with the first included angle 126 and the second included angle 127 also tend to be close to 45°. When the soft-pack battery experiences thermal runaway, the weak part 123 can more safely release the valve at a 45° tilt angle to prevent the ejected high-temperature gas from affecting other normally functioning batteries and other electronic components, and to reduce the further spread of thermal runaway. Conversely, when the difference between a1 and a2 is greater than the maximum value, one of the first included angle 126 and the second included angle 127 will also tend to be closer to 45°. When the angle is close to 180°, the tilt angle of the weak part 123 will be smaller, which will have an adverse effect on the guidance of the pressure relief valve when the soft-pack battery experiences thermal runaway. The ejected high-temperature gas will also affect other normally functioning batteries or other electronic components. When the value of a1 / a2 approaches 1, the angles formed by the weak part 123 with the first angle 126 and the second angle 127 also approach 45°, which is beneficial to the valve. When the value of a1 / a2 differs significantly from 1, one of the first angle 126 and the second angle 127 will approach 180°, which is detrimental to the valve. Therefore, it is necessary to limit the range of a1-a2 and / or a1 / a2 to enable the valve of the weak part 123 to have a better effect.

[0077] Furthermore, the specific size of a1-a2 can be any suitable size within the range of 10° to 70°, such as 10°, 30°, 45°, 60°, 70°, etc., or any size between any two adjacent values. This embodiment does not impose any restrictions on this.

[0078] The specific size of a1 / a2 can be any suitable size within the range of 1.07 to 1.7, such as 1.07, 1.1, 1.2, 1.5, 1.7, etc., or any size between any two adjacent values. This embodiment does not impose any restrictions on this.

[0079] In some implementations, reference Figure 3 As shown, the length of the outer end 1232 is L3mm, L3>L, and L3 / L satisfies 1<L3 / L≤2.5.

[0080] By limiting the range of L3 / L as described above, we can prevent the outer end 1232 from being too long, which would result in a relatively small d3 and insufficient width of the weak part 123, leading to accidental valve opening. We can also prevent the outer end 1232 from being too short, which would result in a relatively large d3 and a large width of the weak part 123, leading to an inability to quickly and directionally release pressure. In other words, the closer the value of L3 / L is to 1, the smaller the difference between the outer end 1232 and the inner end 1231, and thus the larger d3 becomes. Conversely, the further the value of L3 / L is from 1, the larger the difference between the outer end 1232 and the inner end 1231 becomes, and thus the smaller d3 becomes.

[0081] The specific size of L3 / L can be any suitable value within the range defined above, such as 1.1, 1.2, 1.4, 1.6, 1.8, 2, 2.5, etc., or any suitable value less than 1.1 and not equal to 1, or any value between any two adjacent values ​​mentioned above. This embodiment does not impose too many restrictions on this. The length of L3 itself can also be set between 12mm and 40mm, such as 12mm, 15mm, 20mm, 30mm, 40mm, etc., or any suitable value between any two adjacent values ​​mentioned above. This embodiment also does not impose too many restrictions on this.

[0082] In some implementations, reference Figure 2 As shown, L1 < L2, and L2-L1 satisfies 100mm≤L2-L1≤720mm. Since there is a difference in length between L2 and L1, the soft-pack battery can be rectangular in shape, which can then be adapted to the rectangular cell 3 in related technologies, so that it can be assembled with the cell 3 in a more stable and safe manner.

[0083] Furthermore, the values ​​of L2-L1 can be any suitable value within the range of 100mm to 720mm, such as 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 600mm, 700mm, 720mm, or any suitable value between any two adjacent values ​​mentioned above. This embodiment does not impose any further limitations on this.

[0084] Furthermore, the range of L1 can be 70mm-140mm, and the range of L2 can be 240mm-790mm. Specifically, L1 can be selected as 70mm, 80mm, 90mm, 100mm, 120mm, 140mm, etc., or any suitable value between any two adjacent values ​​mentioned above; the range of L2 can be 240mm, 300mm, 350mm, 400mm, 500mm, 600mm, 700mm, 790mm, etc., or any suitable value between any two adjacent values ​​mentioned above. This embodiment does not specifically limit the specific values ​​mentioned above.

[0085] In some implementations, reference Figures 1 to 11 As shown, the soft-pack battery also includes two tabs 2 connected to the cell 3 and connected to opposite sides of the cell 3 respectively; there are two first sealing edges 121, which are connected to opposite sides of the main body 110 respectively and are provided with lead-out holes. The tabs 2 pass through the lead-out holes and are led outward, and the tabs 2 are sealed to the lead-out holes.

[0086] By limiting the lead-out method of tab 2, which involves leading tab 2 out from both sides of cell 3, although this increases the space occupied by the pouch battery on both sides, it can reduce the performance degradation caused by heat generation when tab 2 is led out from the same side. Figures 6 to 9 The illustration is for illustrative purposes only; however, it should be noted that the way the electrode 2 is led out on the same side is exemplary. (Refer to...) Figure 10 and Figure 11 As shown, the tab 2 can also be led out from the same side of the cell 3, which can reduce the space occupied by the soft pack battery on both sides. This embodiment does not limit this too much.

[0087] In some implementations, reference Figures 1 to 3 As shown, the outer casing 1 includes a first casing 130 and a second casing 140. The first casing 130 and the second casing 140 are integrally formed. At least one of the first casing 130 and the second casing 140 is provided with a recess. The recess forms a main body portion 110. A flange edge 120 protrudes from the outer periphery of the recess. The portion of the first casing 130 and the second casing 140 that at least partially overlaps and is sealed together forms a first sealing edge 121 and a second sealing edge 122.

[0088] In the above manner, the outer shell 1 can be integrally formed by the first shell 130 and the second shell 140, which simplifies the manufacturing process of the outer shell 1 and improves the convenience of subsequent soft-pack battery assembly. Furthermore, at least one of the first shell 130 and the second shell 140 has a recess to accommodate the battery cell 3. When the first shell 130 and the second shell 140 are assembled, the overlapping part of the flange edge 120 can form a first sealing edge 121 and a second sealing edge 122 for sealing, thereby achieving a good seal for the soft-pack battery.

[0089] In some implementations, reference Figure 7 , Figure 9 , Figure 10 and Figure 11 As shown, the second sealing edge 122 is formed by bending to form at least two overlapping sealing edges.

[0090] In the above manner, after the second sealing edge 122 initially seals the edge of the pouch battery, it can be bent to achieve multiple sealing layers, thereby reducing or avoiding sealing failure. Furthermore, the multiple sealing layers also make the structure of the pouch battery more stable, allowing for better directional pressure relief. Additionally, at the edge of the sealing edge, the second metal layer of the outer casing 1 is exposed, posing a possibility of contact with other charged components, potentially causing the outer casing 1 to become charged. Therefore, by bending the second sealing edge 122 to form at least two overlapping sealing edges, the exposed second metal layer can be housed internally, reducing the possibility of contact with other components and improving insulation performance.

[0091] In some implementations, reference Figure 4 and Figure 5 As shown, the flange edge 120 and the recessed outer side wall form a third fillet 128, and the radius a3mm of the third fillet 128 satisfies 0.8mm≤a3≤8mm.

[0092] By limiting the radius a3 of the third rounded corner 128 as described above, we can prevent the third rounded corner 128 from being too small, resulting in sharp edges that could scratch the tab 2. We can also prevent the third rounded corner 128 from being too large, resulting in a reduction in the internal space of the casing 1. In other words, when the radius a3 of the third rounded corner 128 is less than the minimum value mentioned above, the third rounded corner 128 will be relatively sharp, which may easily scratch the tab 2 located inside the casing 1 where it connects to the cell 3, causing the tab to break. When the third rounded corner 128 exceeds the maximum value mentioned above, the third rounded corner 128 will also reduce the internal space of the casing 1, making it unable to accommodate a larger cell 3, which may easily lead to a decrease in the overall energy density of the soft-pack battery. Therefore, considering all factors, limiting the radius of the third rounded corner 128 to between 0.8mm and 8mm is a relatively reasonable range.

[0093] The radius a3 of the third fillet 128 can be any suitable value within the range of 0.8mm to 8mm, such as 0.8mm, 1mm, 2mm, 4mm, 5mm, 7mm, 8mm, etc., or any suitable value between any two adjacent values. This embodiment does not impose any restrictions on this.

[0094] In some implementations, reference Figures 1 to 11 As shown, the number of weak points 123 includes at least two.

[0095] By arranging two weak points 123 as described above, when the soft-pack battery experiences thermal runaway and the valve is released, the high-temperature gas expanding inside the outer casing 1 can be discharged to the outside simultaneously or sequentially through the two weak points 123, thereby improving the exhaust efficiency of the soft-pack battery during thermal runaway.

[0096] Further, refer to Figures 6 to 11 As shown, the two weak points 123 are located on the diagonal of the horizontal plane of the outer casing 1, or the two weak points 123 are respectively located at both ends of the same sealing edge on the horizontal plane of the outer casing 1.

[0097] In this way, the two weak parts 123 can be arranged in a suitable manner according to the specific structure of the soft-pack battery or the venting requirements. That is, the two weak parts 123 can be distributed diagonally or set at both ends of a sealing edge.

[0098] In some implementations, reference Figure 10 and Figure 11 As shown, there are two tabs 2, which are respectively connected to the opposite sides of the battery cell 3. Both first sealing edges 121 are provided with lead-out holes. The tabs 2 are inserted through the lead-out holes one by one and led outward. The tabs 2 are sealed to the lead-out holes.

[0099] By using the above method, that is, by leading the tabs 2 out from both sides of the cell 3, the space occupied by the pouch battery in the length direction can be reduced. After the pouch battery is packaged, the two tabs leading out from the same side can also facilitate the subsequent assembly of other conductive components, thus improving the convenience of pouch battery assembly in subsequent grouping and arrangement.

[0100] In some implementations, reference Figure 3 As shown, in order to better achieve directional pressure relief, the thickness of the weak part 123 is less than the thickness of the first sealing edge 121 and / or the second sealing edge 122. In this arrangement, when the pouch battery needs to be depressurized, the thinner weak part 123 can be broken through first when the gas inside the pouch battery collides, thereby better achieving directional pressure relief of the pouch battery.

[0101] In some implementations, combined Figures 1 to 3 ,as well as Figure 12 As shown, the sealing dimensions of the first sealing edge 121 and the second sealing edge 122 are d5mm and d6mm, respectively, where d5 is greater than d1 and / or d6 is greater than d2.

[0102] By using the above method, by setting the sealing dimension d5 of the first sealing edge 121 to be greater than the width of the first sealing edge 121 itself, and / or setting the sealing dimension d6 of the second sealing edge 122 to be greater than the width of the second sealing edge 122 itself, the sealing performance of the soft-pack battery can be further improved, that is, by combining... Figure 3 and Figure 12 As shown, the sealing dimension d5 of the first sealing edge 121 can be understood as the maximum dimension at the connection between the first sealing edge 121 and the weak part 123, and the sealing dimension d6 of the second sealing edge 122 can be understood as the maximum dimension at the connection between the second sealing edge 122 and the weak part 123.

[0103] Furthermore, the increased sealing dimensions at both ends of the weak portion 123, where it connects to the first sealing edge 121 and the second sealing edge 122, can prevent abnormal pressure leakage in the weak portion 123 and further improve the overall strength of the weak portion 123.

[0104] In a second aspect, this utility model provides an electrical device comprising the pouch battery mentioned in the above embodiments, wherein the number of pouch batteries is at least two, and the at least two pouch batteries are arranged along a large surface perpendicular to the outer casing 1. Since this electrical device also has all the beneficial effects of the above specific embodiments, this embodiment will not elaborate further. The electrical device can be a mobile phone, tablet computer, or power bank among smart devices; it can also be a lighting device such as a flashlight or work light; it can also be a cooking device such as an electric cooker, electric baking pan, or rice cooker; it can also be a pure electric vehicle, plug-in hybrid electric vehicle, or range-extended vehicle among new energy vehicles. This embodiment does not limit it further.

[0105] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope of protection claimed by the present invention.

Claims

1. A soft-pack battery, characterized in that, include: The housing (1) includes a main body (110) for accommodating a battery cell (3) and a flange (120) connected to the main body (110). The flange (120) protrudes from the main body (110) in a direction away from the battery cell (3). In the direction away from the battery cell (3), the housing sequentially includes a first inner insulating layer, a second metal layer, and a third outer insulating layer. The flange (120) includes a first sealing edge (121), a weak portion (123), and a second sealing edge (124). 22), the first sealing edge (121) and the second sealing edge (122) are connected to each other, and the weak part (123) is provided at the connection point. The weak part (123) forms a notch (124) on the side away from the main body (110). On the horizontal plane of the outer shell (1), the width of the first sealing edge (121) is d1mm, the width of the second sealing edge (122) is d2mm, the minimum width of the weak part (123) is d3mm, d3<d1, and d3<d2.

2. The soft-pack battery according to claim 1, characterized in that, d1 and d3 satisfy 1mm≤d1-d3≤6mm; d2 and d3 satisfy 11mm≤d2-d3≤16mm.

3. The soft-pack battery according to claim 1, characterized in that, The soft-pack battery also includes a tab (2) electrically connected to the cell (3). The first sealing edge (121) is provided with a lead-out hole. The tab (2) passes through the lead-out hole and is led outward. The tab (2) is sealed to the lead-out hole.

4. The soft-pack battery according to claim 3, characterized in that, The length direction of the second sealing edge (122) is parallel to the length direction of the horizontal plane, and the length direction of the first sealing edge (121) is parallel to the width direction of the horizontal plane.

5. The soft-pack battery according to claim 4, characterized in that, d2 > d1 > d3.

6. The soft-pack battery according to claim 5, characterized in that, The difference between d2 and d1 satisfies 10≤d2-d1≤20; d2 / d1 satisfies 1.5≤d2 / d1≤5.

7. The soft-pack battery according to claim 1, characterized in that, The weak portion (123) includes an inner end (1231) and an outer end (1232) opposite to each other. The inner end (1231) is located on the side closer to the main body (110), and the outer end (1232) is located on the side away from the main body (110). The inner end (1231) is closer to the battery cell (3) than the inner edge of the first sealing edge (121) and / or the inner edge of the second sealing edge (122).

8. The soft-pack battery according to claim 7, characterized in that, The distance between the battery cell (3) and the inner end (1231) is greater than or equal to 1 mm and less than or equal to 8 mm.

9. The soft-pack battery according to claim 7, characterized in that, The length of the inner end (1231) is Lmm, and Lmm satisfies 10mm≤Lmm≤30mm.

10. The soft-pack battery according to claim 9, characterized in that, On the horizontal plane of the outer casing (1), the first sealing edge (121) is perpendicular to the second sealing edge (122), and the weak part (123) extends obliquely relative to the extension directions of the first sealing edge (121) and the second sealing edge (122), respectively.

11. The soft-pack battery according to claim 10, characterized in that, On the horizontal plane of the outer shell (1), the angle between the extension direction of the weak part (123) and the extension direction of the first sealing edge (121) is greater than or equal to 140° and less than or equal to 170°; the angle between the extension direction of the weak part (123) and the extension direction of the second sealing edge (122) is greater than or equal to 100° and less than or equal to 130°.

12. The soft-pack battery according to claim 10, characterized in that, The length of the inner end (1231) is Lmm, and on the horizontal plane of the outer shell (1), the length of the first sealing edge (121) is L1mm, where L1 / L satisfies 2.3≤L1 / L≤14; and / or, On the horizontal plane of the outer shell (1), the length of the second sealing edge (122) is L2mm, and L2 / L satisfies 8≤L2 / L≤79.

13. The soft-pack battery according to claim 3, characterized in that, In the length extension direction of the first sealing edge (121), the distance between the tab (2) and the weak part (123) is d4mm, where d4mm≥5.

14. The soft-pack battery according to claim 10, characterized in that, A first fillet (129) is provided between the outer end (1232) of the weak portion (123) and the first sealing edge (121), and the radius r1 mm of the first fillet (129) satisfies 2≤r1≤8; and / or, A second fillet (125) is provided between the outer end (1232) of the weak part (123) and the second sealing edge (122), and the radius r2 mm of the second fillet (125) satisfies 2≤r2≤8.

15. The soft-pack battery according to claim 10, characterized in that, On the horizontal plane of the outer shell (1), the first sealing edge (121) forms a first included angle (126) with the weak part (123), and the second sealing edge (122) forms a second included angle (127) with the weak part (123). The angle of the first included angle (126) is greater than the angle of the second included angle (127).

16. The soft-pack battery according to claim 15, characterized in that, The angle of the first included angle (126) is a1, the angle of the second included angle (127) is a2, a1-a2 satisfies greater than or equal to 10° and less than or equal to 70°; and / or, a1 / a2 satisfies 1.07≤a1 / a2≤1.

7.

17. The soft-pack battery according to claim 10, characterized in that, The length of the outer end (1232) is L3mm, and L3>L, and L3 / L satisfies 1<L3 / L≤2.

5.

18. The soft-pack battery according to claim 12, characterized in that, L1 < L2, and L2 - L1 satisfies 100 ≤ L2 - L1 ≤ 720.

19. The soft-pack battery according to claim 18, characterized in that, The pouch battery also includes two tabs (2) connected to the cell (3) and connected to opposite sides of the cell (3); There are two first sealing edges (121). The two first sealing edges (121) are respectively connected to the opposite sides of the main body (110) and are provided with lead-out holes. The electrode (2) passes through the lead-out holes and is led outward. The electrode (2) is sealed to the lead-out holes.

20. The pouch cell battery according to any one of claims 1-8, characterized in that, The outer casing (1) includes a first casing (130) and a second casing (140), which are integrally formed. At least one of the first casing (130) and the second casing (140) is provided with a recess, which forms the main body (110). The flange edge (120) protrudes from the outer periphery of the recess. The portion of the first casing (130) and the second casing (140) that is at least partially overlapped and sealed together forms the first sealing edge (121) and the second sealing edge (122).

21. The soft-pack battery according to claim 20, characterized in that, The second sealing edge (122) is formed by bending to form at least two overlapping sealing edges.

22. The soft-pack battery according to claim 20, characterized in that, The flange edge (120) forms a third fillet (128) with the outer wall of the recess, and the radius a3mm of the third fillet (128) satisfies 0.8≤a3≤8.

23. The pouch cell battery according to any one of claims 1-8, characterized in that, The number of the weak points (123) includes at least two.

24. The soft-pack battery according to claim 23, characterized in that, The two weak points (123) are located on the diagonal of the horizontal plane of the outer shell (1), or the two weak points (123) are located at both ends of the same sealing edge on the horizontal plane of the outer shell (1).

25. The soft-pack battery according to claim 23, characterized in that, The pouch battery also includes two tabs (2) connected to the cell (3) and connected to opposite sides of the cell (3); Both of the first sealing edges (121) are provided with lead-out holes. The electrode tabs (2) are inserted through the lead-out holes one by one and led outward. The electrode tabs (2) are sealed to the lead-out holes.

26. The pouch cell according to any one of claims 1-8, characterized in that, The thickness at the weak point (123) is less than the thickness of the first sealing edge (121) and / or the second sealing edge (122).

27. The pouch cell according to any one of claims 1-8, characterized in that, The sealing dimensions of the weak part and the first sealing edge, the first sealing edge (121) and the second sealing edge (122) are d5mm and d6mm respectively, where d5 is greater than d1 and / or d6 is greater than d2.

28. An electrical appliance, characterized in that, Includes a pouch cell as described in any one of claims 1-27, wherein the number of the pouch cells is at least two, and the at least two pouch cells are arranged along a large surface perpendicular to the outer casing (1).

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