Packaging shell, battery monomer, battery module, battery and power utilization device

Abstract

A packaging shell, a battery monomer, a battery module, a battery and an electric device, the packaging shell defines an accommodating cavity for accommodating an electrode assembly, the packaging shell comprises a thin film layer and a metal layer which are laminated, the metal layer has a notch area, and the part of the thin film layer covering the notch area forms a pressure relief part.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a packaging shell, a battery cell, a battery module, a battery, and an electrical device. Background Technology

[0002] When a battery cell encounters overheating, overcharging, internal short circuits, collisions, or compression, the electrode components inside the cell generate a large amount of heat, causing expansion. If expansion is restricted or internal pressure is excessive, the battery cell is highly susceptible to explosion, posing a threat to life and property. To address this technical problem, some battery cells in related technologies employ explosion-proof valves. However, explosion-proof valves are not only structurally complex and costly, but also have limited applicability; for example, they cannot be installed on pouch cells. Summary of the Invention

[0003] This application provides a packaging shell, a battery cell, a battery module, a battery, and an electrical device that can achieve directional pressure relief and ejection, avoiding the explosion problem of the battery cell. Moreover, the method of forming the pressure relief part is simple, easy to process, low in cost, and has a wide range of applications.

[0004] In a first aspect, embodiments of this application provide a packaging shell for a battery cell, the packaging shell defining a receiving cavity for accommodating an electrode assembly, the packaging shell including a thin film layer and a metal layer stacked together, the metal layer having a notched region, and the portion of the thin film layer covering the notched region forming a pressure relief portion.

[0005] In the above technical solution, by designing a portion of the metal layer of the packaging shell as a notch area, the corresponding position of the thin film layer at the notch area forms a pressure relief section that can seal the notch area and is easily ruptured for pressure release. This allows for directional pressure relief of the battery cell while meeting the sealing requirements of the packaging shell, preventing explosions caused by excessive internal pressure in the battery cell. Furthermore, since the pressure relief direction is definite, the spread of pressure relief eruptions can be effectively reduced, improving the overall safety of the battery. Moreover, the method of forming the pressure relief section in the packaging shell proposed in this application is simple, easy to process, and low in cost. It is applicable to cylindrical, prismatic, and pouch battery cells, and has a wide range of applications.

[0006] In some embodiments, the thickness of the receiving cavity is divided into two end face regions on both sides, and the end face regions connecting the two sides form a side region, with the pressure relief portion disposed in the side region. This technical solution facilitates rapid pressure relief.

[0007] In some embodiments, the side region is adapted to have an electrical connection portion, and the pressure relief portion is disposed on the opposite side of the electrical connection portion. In the above technical solution, it is beneficial to mitigate the impact of thermal runaway on the electrical connection portion.

[0008] In some embodiments, the pressure relief portion is adapted to be positioned on both sides of the length of the receiving cavity along with the electrical connection portion. In the above technical solution, the effects of thermal runaway on the electrical connection portion can be better avoided.

[0009] In some embodiments, the pressure relief portion is adapted to be disposed at the shaft end corresponding to the electrode assembly being a wound electrode assembly. This design facilitates rapid pressure relief.

[0010] In some embodiments, the pressure relief section is adapted to be disposed around the periphery of the electrode assembly, which is a stacked electrode assembly. This design facilitates rapid pressure relief.

[0011] In some embodiments, the film layer includes an inner film layer covering the inside of the metal layer and / or an outer film layer covering the outside of the metal layer. This results in better structural reliability of the packaging shell.

[0012] In some embodiments, the packaging shell is formed by sealing the edges with at least one heat-sealing film, the heat-sealing film comprising the metal layer and the thin film layer located on both the inner and outer sides of the metal layer. Therefore, the packaging shell is advantageous for packaging individual pouch battery cells.

[0013] In some embodiments, the pressure relief portion is located at the heat-sealed edge. This design facilitates effective pressure relief.

[0014] In some embodiments, the heat-sealed edge includes a weak-sealing region, the sealing strength of which is less than the sealing strength of the remaining areas of the heat-sealed edge, and the pressure relief portion is located in the weak-sealing region. This technical solution facilitates effective pressure relief.

[0015] In some embodiments, the sealing width of the weak sealing region is smaller than the sealing width of the remaining regions; or, the sealing compression amount of the weak sealing region is smaller than the sealing compression amount of the remaining regions. The above technical solutions facilitate processing.

[0016] In some embodiments, the notch region extends through the edge of the metal layer. This facilitates processing.

[0017] In some embodiments, the notch region is spaced apart from the edge of the metal layer. The above technical solutions offer flexibility in design.

[0018] Secondly, embodiments of this application also provide a battery cell, including an electrode assembly and a packaging shell for the battery cell, wherein the electrode assembly is disposed within the receiving cavity.

[0019] Thirdly, embodiments of this application also provide a battery module, including a module housing and at least one of the above-described battery cells, wherein the battery cells are placed in a receiving space formed by the module housing.

[0020] In some embodiments, one side surface of the module housing is a setting surface, and an explosion-proof part is provided on the setting surface. The pressure relief part of the battery cell is disposed facing the setting surface. In the above technical solution, it is beneficial to quickly and directionally release pressure.

[0021] In some embodiments, the thickness direction of each battery cell is a first direction, and a plurality of battery cells within the module housing are arranged into a battery pack along the first direction. The designated surface is located on one side of the plurality of battery packs in a second direction, which intersects the first direction. This technical solution facilitates rapid pressure release.

[0022] In some embodiments, the explosion-proof part is positioned at the center of the battery pack in the first direction. This design facilitates rapid pressure relief.

[0023] In some embodiments, the module housing has an electrical contact portion, which is disposed on the opposite side of the explosion-proof portion. This technical solution helps to mitigate the impact of thermal runaway on the electrical contact portion.

[0024] In some embodiments, the electrical contact portion and the explosion-proof portion are located on opposite sides of the module housing. This technical solution helps to mitigate the impact of thermal runaway on the electrical contact portion.

[0025] Fourthly, embodiments of this application also provide a battery, including: a battery module and an emission assembly, wherein the battery module is the battery module described above, the emission assembly defines an emission chamber, the explosion-proof part of the battery module is disposed toward the emission assembly, and the explosion-proof part is adapted to eject into the emission chamber.

[0026] In some embodiments, the battery modules are respectively disposed on both sides of the emission assembly, and the emission chamber has an anti-spray component, which includes a particulate matter treatment component and / or a fire-retardant material component. The above technical solution is beneficial for improving battery safety.

[0027] In some embodiments, the side of the emission assembly facing the battery module has a heat exchange section. This improves the operational reliability of the battery.

[0028] In some embodiments, the battery further includes a housing containing a plurality of battery modules, and the discharge assembly constitutes a partition beam and / or side beam of the housing. The above technical solution simplifies the structure.

[0029] Fifthly, embodiments of this application also provide an electrical device, including the battery described above. Attached Figure Description

[0030] Figure 1 A schematic diagram of a battery cell provided in some embodiments of this application;

[0031] Figure 2 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0032] Figure 3 Cross-sectional views of packaging shells provided for some embodiments of this application;

[0033] Figure 4 Cross-sectional views of packaging shells provided for some embodiments of this application;

[0034] Figure 5 A schematic diagram of a battery cell provided in some embodiments of this application;

[0035] Figure 6 Schematic diagram of the metal layer provided for some embodiments of this application;

[0036] Figure 7 Schematic diagram of the metal layer provided for some embodiments of this application;

[0037] Figure 8 This is a schematic diagram of a battery module provided in some embodiments of this application;

[0038] Figure 9 A schematic diagram of a battery provided for some embodiments of this application;

[0039] Figure 10 Exploded views of batteries provided for some embodiments of this application;

[0040] Figure 11 A schematic diagram of the emission components provided in some embodiments of this application;

[0041] Figure 12 Partial view of the emission components provided for some embodiments of this application;

[0042] Figure 13 A schematic diagram of a vehicle provided for some embodiments of this application.

[0043] Figure label:

[0044] 10000 - Battery; 1000 - Battery Module; 100 - Battery Cell; 1 - Packaging Shell; 101 - Receiving Cavity; 1011 - End Face Area; 1012 - Side Area; 102 - Heat-Sealing Film; 103 - Heat-Sealing Edge; 11 - Thin Film Layer; 111 - Pressure Relief Section; 11a - Outer Thin Film Layer; 11b - Inner Thin Film Layer; 12 - Metal Layer; 121 - Notch Area; 2 - Electrode Assembly; 3 - Electrical connection part; 200-Module housing; 201-Setting surface; 202-Explosion-proof part; 203-Electrical connection part; 300-Battery pack; 2000-Emission assembly; 2001-Emission chamber; 2002-Inlet; 2003-Anti-spray component; 2004-Heat exchange part; 2005-Beam; 2006-Cold plate; 3000-Box; 3001-Accommodation cavity; 20000-Electrical device. Detailed Implementation

[0045] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0046] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application; however, those skilled in the art will recognize the applicability of other processes and / or the use of other materials.

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0049] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] 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 B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0052] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0053] In this application, "multiple" means two or more (including two).

[0054] In this application, a battery refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. Some batteries may include a housing for encapsulating one or more individual battery cells or multiple battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the individual battery cells. Of course, some batteries may not require the aforementioned housing and may be directly installed within the battery mounting compartment of the electrical device.

[0055] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0056] For example, a single battery cell may include a packaging shell, electrode components, and electrolyte. The packaging shell is used to house the electrode components and electrolyte. The electrode components consist of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode components. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated positive current collector protrudes beyond the coated positive current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0057] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the one with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. To ensure that a large current can be passed without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.

[0058] The separator can be made of PP (polypropylene) or PE (polyethylene), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0059] When a battery cell encounters overheating, overcharging, internal short circuit, collision, or compression, the electrode components inside the battery cell will generate a large amount of heat and expand. If the expansion is restricted or the internal pressure is too high, the battery cell is very likely to explode, endangering people's lives and property.

[0060] Based on this, the applicant, after in-depth research, proposed a packaging shell 1 for a battery cell 100. The packaging shell 1 is configured to include a thin film layer 11 and a metal layer 12 stacked together. The metal layer 12 has a notched area 121, and the portion of the thin film layer 11 covering the notched area 121 forms a pressure relief section 111. Thus, by partially designating the metal layer 12 of the packaging shell 1 as the notched area 121, the thin film layer 11 at the position corresponding to the notched area 121 forms a pressure relief section 111 that is both sealable and easily punctured. This achieves directional pressure relief of the battery cell 100 while meeting the sealing requirements of the packaging shell 1, avoiding the explosion problem caused by excessive internal pressure in the battery cell 100. Furthermore, since the pressure relief direction is definite, the diffusion range of the pressure relief eruption can be effectively reduced, improving the overall safety of the battery 10000. Moreover, the method of forming the pressure relief section 111 in the packaging shell 1 proposed in this application is simple, easy to process, and low in cost. It is applicable to cylindrical battery cells, prismatic battery cells, and pouch battery cells, and has a wide range of applications.

[0061] Furthermore, it should be noted that the battery 10000 disclosed in this application embodiment can be used, but is not limited to, in electrical devices 20000 such as vehicles, ships, or aircraft. Therefore, this application embodiment provides an electrical device 20000 that uses the battery 10000 as a power source. The electrical device 20000 can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0062] The packaging shell 1 according to some embodiments of this application is described below.

[0063] like Figure 1 and Figure 2 As shown, the packaging shell 1 is used for the battery cell 100, and the packaging shell 1 defines a receiving cavity 101 for accommodating the electrode assembly 2. It can be understood that both the electrode assembly 2 and the electrolyte of the battery cell 100 are disposed within the receiving cavity 101.

[0064] Combination Figure 3 The packaging shell 1 includes a film layer 11 and a metal layer 12 stacked together. The metal layer 12 has a notch region 121. The portion of the film layer 11 covering the notch region 121 is formed as a pressure relief portion 111.

[0065] The stacked arrangement of the thin film layer 11 and the metal layer 12 means that the thin film layer 11 covers at least one side of the thickness of the metal layer 12.

[0066] The number of thin film layers 11 is unlimited; it can be a single layer or multiple layers. Furthermore, the material of the thin film layers 11 is not limited; it can be set to different non-metallic materials according to functional requirements. Therefore, based on the actual situation such as the material of the thin film layers 11, the thickness of the thin film layers 11 can be selected on which side of the metal layer 12 it covers.

[0067] The form of the metal layer 12 is not limited; for example, it can be in the form of a metal plate (e.g., for packaging of square battery cells) or a metal foil (e.g., for packaging of pouch battery cells). Furthermore, the material of the metal layer 12 is not limited; different materials can be selected as needed, and no restrictions are placed here.

[0068] Therefore, according to the packaging shell 1 of the battery cell 100 of this application, by partially designating a notch region 121 in the metal layer 12 of the packaging shell 1, the thin film layer 11 is formed at the position corresponding to the notch region 121 to form a pressure relief part 111 that can seal the notch region 121 and is easy to break through for pressure relief. Thus, while meeting the sealing requirements of the packaging shell 1, directional pressure relief of the battery cell 100 can be achieved, avoiding the explosion problem caused by excessive internal pressure of the battery cell 100. Moreover, since the pressure relief direction is definite, the diffusion range of the pressure relief eruption can be effectively reduced, improving the overall safety of the battery 10000. Furthermore, the method of forming the pressure relief part 111 in the packaging shell 1 proposed in this application is simple, easy to process, and low in cost. It is applicable to cylindrical battery cells, square battery cells, and pouch battery cells, and has a wide range of applications.

[0069] The inventors discovered that for square battery cells, an explosion-proof valve can be installed on the metal casing to provide pressure relief and explosion prevention. However, the explosion-proof valve has a complex structure, is difficult to install, has high production costs, and its pressure relief reliability is difficult to guarantee due to factors such as installation. When the square battery cell uses the packaging shell 1 of this application, a notch area 121 can be cut out in the metal casing, and a film can be applied to the metal casing to seal the notch area 121, thereby obtaining a pressure relief part 111 corresponding to the notch area 121. This can effectively reduce the processing and assembly difficulty of the packaging shell 1, reduce processing costs, and improve the reliability of pressure relief and explosion prevention.

[0070] The inventors discovered that for pouch battery cells, a thin film is typically used as the packaging shell. It is difficult to install an explosion-proof valve on such a shell. When encountering overheating, overcharging, internal short circuits, collisions, or compression, the electrode components inside the pouch battery cell generate a large amount of heat, causing expansion. If expansion is restricted or internal pressure is excessive, the pouch battery cell is highly susceptible to explosion. Furthermore, when a pouch battery cell erupts due to restricted expansion or excessive internal pressure, the unpredictable direction of the eruption greatly increases the spread and impact range. For example, it can easily trigger the explosion of other pouch battery cells within the battery, resulting in a greater overall safety hazard and compromising consumer safety.

[0071] To address the aforementioned technical issues, some existing technologies incorporate a locally narrow sealing area at the edge of the pouch cell's packaging. This narrow sealing area is narrower than the sealing width at other locations, allowing heat generated inside the pouch cell to easily escape through this area. However, because the electrolyte inside the pouch cell can corrode the packaging, a small sealing width and a long sealing length in this narrow area can compromise the pouch cell's seal, potentially leading to leakage.

[0072] When the pouch battery cell uses the packaging shell 1 of this application, a pressure relief section 111 can be obtained by cutting out a notch area 121 in the metal layer 12 and sealing the notch area 121 with a thin film covering the metal layer 12. This pressure relief section 111 can achieve pressure relief and prevent explosion. Moreover, since the pressure relief section 111 is provided, directional pressure relief can be achieved, which can reduce the adverse effects on other battery cells 100 in the battery 10000 during thermal runaway. Furthermore, since the pressure relief section 111 is formed through the notch area 121 of the metal layer 12, even if the pressure relief section 111 is located at the sealing edge, it is not necessary to set it into a locally extremely narrow sealing edge to meet the requirements of easy puncture, thus avoiding the risk of leakage and improving the reliability of the battery 10000.

[0073] In some embodiments of this application, such as Figure 2 and Figure 5 As shown, the cavity 101 has end face regions 1011 on both sides, and a side region 1012 connecting the end face regions 1011 on both sides. A pressure relief section 111 is located in the side region 1012. This facilitates rapid pressure relief and improves the thermal runaway safety of the battery cell 100. For example, generally, the thickness direction of the positive and negative electrode sheets in the electrode assembly 2 is usually the thickness direction of the cavity 101, and the pressure relief ejection direction is usually perpendicular to the thickness direction of the positive and negative electrode sheets. That is, it is equivalent to pressure relief ejection towards the side region 1012. Thus, by placing the pressure relief section 111 in the side region 1012, rapid pressure relief ejection is facilitated, further avoiding the risk of explosion and improving safety.

[0074] Of course, this application is not limited to this. In other embodiments of this application, the pressure relief part 111 may also be provided in the end face region 1011 to adapt to different electrode assembly 2 settings, or to meet other requirements such as ease of processing, which will not be elaborated here.

[0075] As mentioned above, the type of electrode assembly 2 in the battery cell 100 used in the packaging shell 1 of this application is not limited.

[0076] For example, in some embodiments, when the electrode assembly 2 is a wound electrode assembly, the pressure relief part 111 is adapted to be disposed at the axial end corresponding to the wound electrode assembly 2. Specifically, for a wound electrode assembly, the thickness direction of the positive and negative electrode sheets in the wound electrode assembly is perpendicular to the axial direction of the wound electrode assembly, and the pressure relief ejection direction is usually perpendicular to the thickness direction of the positive and negative electrode sheets. That is, it is equivalent to pressure relief ejection towards the axial direction of the wound electrode assembly. In this way, by disposing the pressure relief part 111 at the axial end of the wound electrode assembly, it is beneficial to quickly relieve pressure and eject, further avoid the risk of explosion, and improve safety.

[0077] For example, in some embodiments, when the electrode assembly 2 is a stacked electrode assembly, the pressure relief part 111 is adapted to be disposed around the periphery of the stacked electrode assembly. Specifically, for a stacked electrode assembly, the thickness direction of the positive and negative electrode sheets in the stacked electrode assembly is perpendicular to the periphery of the stacked electrode assembly, and the pressure relief ejection direction is usually perpendicular to the thickness direction of the positive and negative electrode sheets. That is, it is equivalent to pressure relief ejection towards the periphery of the stacked electrode assembly. In this way, by disposing the pressure relief part 111 around the periphery of the stacked electrode assembly, it is beneficial to quickly relieve pressure and eject, further avoid the risk of explosion, and improve safety.

[0078] In some embodiments of this application, such as Figure 1 As shown, the side region 1012 is adapted to have an electrical connection portion 3 (e.g., a tab or terminal post), and the pressure relief portion 111 is disposed on the opposite side of the electrical connection portion 3. That is, the pressure relief portion 111 and the electrical connection portion 3 are not disposed on the same side surface. In this way, since the electrical connection portion 3 and the pressure relief portion 111 are located on different surfaces of the battery cell 100, it is beneficial to ensure a large distance between the electrical connection portion 3 and the pressure relief portion 111 of the battery cell 100. This effectively prevents conductive particles in the discharge material emitted by the battery cell 100 through the pressure relief portion 111 from flowing to the electrical connection portion 3 in the event of thermal runaway, causing insulation failure, high-voltage arcing, and other problems. It also ensures the creepage clearance between the electrical connection portions 3 of the battery cell 100 to avoid short circuit problems and improve the working reliability of the battery cell 100.

[0079] Optionally, such as Figure 1As shown, the pressure relief portion 111 is adapted to be positioned on both sides of the length of the receiving cavity 101, respectively, with the electrical connection portion 3. This further increases the distance between the electrical connection portion 3 and the pressure relief portion 111, better protecting the electrical connection portion 3 from the emissions discharged from the pressure relief portion 111, thus reducing the probability of being affected and improving the safety and reliability of the battery cell 100.

[0080] Of course, this application is not limited to this. For example, in other embodiments of this application, the pressure relief part 111 and the electrical connection part 3 may be disposed on adjacent sides of the battery cell 100, or on both sides of the width of the battery cell 100, etc., to meet other different requirements, which will not be elaborated here.

[0081] In some embodiments of this application, such as Figure 3 As shown, the thin film layer 11 may include an inner thin film layer 11b covering the inside of the metal layer 12, wherein "inner" refers to the side of the metal layer 12 facing the receiving cavity 101. Thus, the thin film layer 11 can perform corresponding functions, such as insulation or heat-sealing.

[0082] In some embodiments of this application, such as Figure 3 As shown, the thin film layer 11 may include an outer thin film layer 11a covering the outside of the metal layer 12, wherein "outer side" refers to the side of the metal layer 12 facing away from the receiving cavity 101. Thus, the thin film layer 11 can perform corresponding functions, such as protection or insulation.

[0083] In some embodiments of this application, such as Figure 3 As shown, the thin film layer 11 is multi-layered and includes an inner thin film layer 11b covering the inside of the metal layer 12, and an outer thin film layer 11a covering the outside of the metal layer 12. This improves the sealing performance of the pressure relief section 111 and better avoids the risk of leakage. Here, "inner side" refers to the side of the metal layer 12 facing the receiving cavity 101; "outer side" refers to the side of the metal layer 12 facing away from the receiving cavity 101.

[0084] For example, in some embodiments, the packaging shell 1 is formed by sealing the heat-sealed edge 103 with at least one heat-sealing film 102, the heat-sealing film 102 including a metal layer 12 and thin film layers 11 located on both the inner and outer sides of the metal layer 12 (i.e., the thin film layer 11 located on the outer side of the metal layer 12 and the thin film layer 11 located on the inner side of the metal layer 12). Figure 2 As shown, the packaging shell 1 can be used for a soft-pack battery cell, and the heat-sealing film 102 includes, from the outside to the inside, the following layers arranged in sequence: outer thin film layer 11a (i.e., thin film layer 11 located outside the metal layer 12), metal layer 12, and inner thin film layer 11b (i.e., thin film layer 11 located inside the metal layer 12).

[0085] For example, when the packaging shell 1 is formed by sealing two heat-sealing films 102 with heat-sealing edge 103, during packaging, the two heat-sealing films 102 can be pressed together by a hot press, the inner film layer 11b melts and fuses together, and a heat-sealing edge 103 is formed at the edge of the two heat-sealing films 102. At the same time, the space between the two heat-sealing films 102 surrounded by the heat-sealing edge 103 is the receiving cavity 101.

[0086] For example, when the packaging shell 1 is formed by sealing the heat-sealed edges 103 with a heat-sealing film 102, during packaging, the heat-sealing film 102 is folded in half, and then the remaining three sides are heat-sealed to create a receiving cavity 101 between the three heat-sealed edges 103 and the folds, which can also achieve the effect of packaging. This will not be elaborated here. Alternatively, in other embodiments of this application, the packaging shell 1 can also be formed by sealing the heat-sealed edges 103 with three or more heat-sealing films 102. This will not be elaborated here.

[0087] For the heat-sealing film 102, the inner film layer 11b can be a polypropylene layer, etc., to perform functions such as heat fusion bonding. The outer film layer 11a can be a polyethylene layer or a nylon layer, etc., to perform a protective function. The metal layer 12 can be aluminum foil, steel foil, etc., to perform functions such as support and insulation, and there are no restrictions here.

[0088] It is worth noting that when the heat-sealing film 102 includes, from the outside to the inside, an outer thin film layer 11a, a metal layer 12, and an inner thin film layer 11b, the number of outer thin film layers 11a and the number of inner thin film layers 11b are not limited. At the position corresponding to the notch region 121, the outer thin film layer 11a and the inner thin film layer 11b can be connected (e.g., Figure 4 As shown), it can also be disconnected (e.g. Figure 3 As shown in the figure, no restrictions are imposed here.

[0089] Furthermore, it is worth noting that when the packaging shell 1 is used for a square battery cell, for example... Figure 5 As shown, the packaging shell 1 may include a metal layer 12 in the form of a metal plate and at least one thin film layer 11. The thin film layer 11 may be located inside the metal layer 12 (i.e., the inner thin film layer 11b) or outside the metal layer 12 (i.e., the outer thin film layer 11a). The material of the metal layer 12 is not limited, such as steel plate or aluminum plate, etc., which will not be described in detail here.

[0090] When the packaging shell 1 is formed by sealing the heat-sealed edges 103 with at least one heat-sealing film 102, in some alternative embodiments, such as Figure 1 As shown, the pressure relief section 111 can be located at the heat-sealing edge 103. Therefore, since the heat-sealing edge 103 is relatively thin, the pressure relief section 111 can be stacked together to better meet the pressure relief and ejection requirements.

[0091] Furthermore, the heat-sealed edge 103 may include a weak-sealing region, the sealing strength of which is less than that of the rest of the heat-sealed edge 103, and the pressure relief part 111 is located in the weak-sealing region. That is, under the same pressure, the weak-sealing region is more easily damaged than other parts of the heat-sealed edge 103. Therefore, by placing the pressure relief part 111 in the weak-sealing region, the superposition of the weak-sealing region and the pressure relief part 111 can better meet the pressure relief and ejection requirements.

[0092] The formation method of the weak sealing area is not limited. For example, in some optional examples, the sealing width of the weak sealing area is smaller than the sealing width of the other areas. That is, by varying the sealing edge width, the relatively narrower part of the sealing edge is designated as the weak sealing area, thus facilitating processing. Furthermore, since a pressure relief section 111 is provided in the weak sealing area, the width of the weak sealing area does not need to be extremely narrow, thereby meeting the pressure relief and ejection requirements while avoiding leakage problems.

[0093] For example, in some alternative examples, the sealing compression of the weak sealing region is less than that of the other regions. In other words, by varying the sealing compression during encapsulation, the region with the relatively smaller sealing compression is designated as the weak sealing region, which facilitates processing and can better prevent leakage problems.

[0094] In some embodiments of this application, such as Figure 6 As shown, the notch region 121 can penetrate the edge of the metal layer 12. This facilitates the processing of the notch region 121. Moreover, when the pressure relief part 111 is located at the heat-sealing edge 103, by setting the notch region 121 to penetrate the edge of the metal layer 12, the positional requirements of the pressure relief part 111 can be better met.

[0095] In other embodiments of this application, such as Figure 7 As shown, the notch region 121 can also be spaced apart from the edge of the metal layer 12. That is to say, the notch region 121 does not penetrate the edge of the metal layer 12, thereby allowing the pressure relief part 111 to be set in a flexible and varied manner to meet a variety of different design requirements, which will not be elaborated here.

[0096] It is worth noting that the number of gap regions 121 is unlimited, and therefore the number of corresponding pressure relief sections 111 is also unlimited. For example, there can be only one pressure relief section 111, which is beneficial for directional pressure relief eruption and for the collection of erupted emissions. Alternatively, there can be multiple pressure relief sections 111, which is beneficial for rapid pressure relief eruption. In this case, the erupted emissions can be collected from multiple directions.

[0097] The battery cell 100 according to an embodiment of this application will now be described.

[0098] like Figure 1 and Figure 2As shown, the battery cell 100 may include an electrode assembly 2 and a packaging shell 1. The packaging shell 1 defines a receiving cavity 101 for accommodating the electrode assembly 2, and the packaging shell 1 is the packaging shell 1 of the battery cell 100 according to any embodiment of this application. Thus, the battery cell 100 according to this application, by adopting the packaging shell 1 of this application, by setting a portion of the metal layer 12 of the packaging shell 1 as a notch region 121, so that the position of the thin film layer 11 corresponding to the notch region 121 is formed as a pressure relief part 111 that can seal the notch region 121 and is easy to break through for pressure relief, thereby achieving directional pressure relief of the battery cell 100 while meeting the sealing requirements of the packaging shell 1, avoiding the explosion problem caused by excessive internal pressure of the battery cell 100, and since the pressure relief direction is determined, the diffusion range of the pressure relief eruption can be effectively reduced, thereby improving the overall safety of the battery 10000.

[0099] Moreover, the method of forming the pressure relief part 111 in the packaging shell 1 proposed in this application is simple, easy to process, and low in cost. It is applicable to cylindrical battery cells, square battery cells and pouch battery cells, and has a wide range of applications, so that the type of battery cell 100 in the embodiments of this application is not limited.

[0100] The battery module 1000 according to an embodiment of this application will now be described.

[0101] like Figure 8 As shown, the battery module 1000 may include a module housing 200 and at least one battery cell 100 according to an embodiment of this application. The battery cell 100 is placed in a receiving space formed by the module housing 200. That is, a receiving space is formed inside the module housing 200, and one or more battery cells 100 can be placed in the receiving space. When multiple battery cells 100 are placed, the overall installation of multiple battery cells 100 can be realized, thereby improving assembly efficiency.

[0102] Based on the above solution, since the battery cell 100 of this application adopts the packaging shell 1 of this application, the safety of the battery cell 100 can be improved while reducing costs, thereby improving the safety of the entire battery module 1000 and reducing the cost of the entire battery module 1000.

[0103] In some embodiments, such as Figure 8As shown, one side surface of the module housing 200 is a setting surface 201, on which an explosion-proof part 202 is provided. The pressure relief part 111 of the battery cell 100 is positioned facing the setting surface 201. That is, one side of the pressure relief part 111 of each battery cell 100 faces the setting surface 201, so that it can be ejected generally towards the explosion-proof part 202. Therefore, the emissions from the pressure relief of the battery cell 100 can be easily ejected from the explosion-proof part 202, thereby improving the safety of the battery module 1000. It is worth noting that the specific structure of the explosion-proof part 202 is not limited; for example, it can be a thinned weak part or an explosion-proof valve, etc., and is not restricted here.

[0104] For example, in some embodiments, such as Figure 8 As shown, a plurality of battery cells 100 are disposed within the module housing 200, and the plurality of battery cells 100 are arranged in a battery pack 300 along a first direction F1. The thickness direction of each battery cell 100 is the first direction F1. A setting surface 201 is provided on one side of the plurality of battery packs 300 in a second direction F2, which intersects the first direction F1. That is, the second direction F2 and the first direction F1 have different extension directions, for example, they can intersect at an acute angle, a right angle or an obtuse angle.

[0105] Generally, the thickness direction of the positive and negative electrode plates in the electrode assembly 2 is usually the thickness direction of the battery cell 100 (i.e., the first direction F1), and the pressure relief ejection direction is usually perpendicular to the thickness direction of the positive and negative electrode plates (e.g., along the second direction F2 or slightly inclined to the second direction F2). Therefore, by setting the setting surface 201 of the explosion-proof part 202 on one side of the battery pack 300 in the second direction F2, the requirement for the battery cell 100 to release pressure along the second direction F2 can be met. This facilitates the rapid pressure relief ejection of each battery cell 100 in the module housing 200, further avoids the risk of explosion, and improves safety.

[0106] Furthermore, when the first direction F1 is set to the vertical direction and the second direction F2 is set to the horizontal direction, each battery cell 100 is essentially laid flat, occupying less vertical space, reducing the overall height of the battery module 1000, and also lowering the center of gravity of the battery cell 100, thus reducing the pressure relief and splashing range of the battery cell 100.

[0107] In some embodiments, such as Figure 8As shown, the explosion-proof part 202 can be positioned at the center of the battery pack 300 in the first direction F1. Therefore, when any battery cell 100 in the battery pack 300 is depressurized and ejected, it can relatively quickly break through the explosion-proof part 202, thereby further improving the safety of the battery module 1000. For example, the battery pack 300 includes four battery cells 100 arranged along the first direction F1, with the explosion-proof part 202 positioned between the two middle battery cells 100; or, for another example, the battery pack 300 includes five battery cells 100 arranged along the first direction F1, with the explosion-proof part 202 positioned corresponding to the middle battery cell 100 among the five battery cells 100.

[0108] In some embodiments, such as Figure 8 As shown, the module housing 200 has a grounding part 203, which is disposed on opposite sides of the explosion-proof part 202. That is, the explosion-proof part 202 and the grounding part 203 are not located on the same surface. Because the grounding part 203 and the explosion-proof part 202 are located on different surfaces of the battery module 1000, a larger gap is maintained between them. This effectively prevents conductive particles from the emissions from the explosion-proof part 202 from flowing to the grounding part 203 in the event of thermal runaway, causing insulation failure, high-voltage arcing, or other problems. It also ensures a creepage clearance between the grounding parts 203 of the battery module 1000 to avoid short circuits and improve the operational reliability of the battery module 1000.

[0109] In some embodiments, such as Figure 8 As shown, the power receiving part 203 and the explosion-proof part 202 are located on opposite sides of the module housing 200. This further increases the distance between the power receiving part 203 and the explosion-proof part 202, better protecting the power receiving part 203 from the emissions emitted by the explosion-proof part 202, thus reducing the probability of being affected and improving the safety and reliability of the battery module 1000. Of course, this application is not limited to this. In other embodiments of this application, the power receiving part 203 and the explosion-proof part 202 can also be located on adjacent sides of the module housing 200, or even on the same side, to meet different practical needs, which will not be elaborated here.

[0110] The battery 10000 according to an embodiment of this application will now be described.

[0111] like Figure 9 As shown, the battery 10000 may include a battery module 1000 and an emission assembly 2000. The battery module 1000 is the battery module 1000 according to the embodiments of this application. The emission assembly 2000 defines an emission chamber 2001. The explosion-proof part 202 of the battery module 1000 is disposed toward the emission assembly 2000. The explosion-proof part 202 is adapted to spray into the emission chamber 2001.

[0112] For example, when a battery cell 100 experiences thermal runaway, the battery cell 100 discharges emissions such as flames, smoke, or gases through the pressure relief section 111. The emissions then pass through the explosion-proof section 202 and enter the discharge chamber 2001 for storage or removal. Thus, by providing the discharge assembly 2000, the venting requirements can be met during thermal runaway, while also preventing insulation failure caused by the movement of conductive particles, thereby reducing the thermal diffusion effects of thermal runaway.

[0113] For example, combining Figure 9 The battery module 1000 can be located outside the discharge assembly 2000. The explosion-proof part 202 of the battery module 1000 is positioned facing the inlet 2002 of the discharge chamber 2001 so that it can be quickly discharged toward the discharge chamber 2001 in the event of thermal runaway.

[0114] Combination Figure 10 and Figure 11 When the emission component 2000 is simultaneously configured to correspond with multiple battery modules 1000, the emission component 2000 may have multiple inlets 2002, each inlet 2002 corresponding to one battery module 1000. That is, multiple battery modules 1000 are configured to correspond one-to-one with multiple inlets 2002. More specifically, the explosion-proof part 202 of each battery module 1000 is configured to correspond to one inlet 2002, which is conducive to rapid pressure relief and emission during thermal runaway.

[0115] For example in Figure 10 In the specific example shown, battery modules 1000 are provided on both sides of the emission component 2000. Each side of the emission component is provided with multiple battery modules 1000, and the multiple battery modules 1000 are spaced apart along the length of the emission component 2000. Thus, multiple battery modules 1000 can share the same emission component 2000, thereby simplifying the structure and reducing the volume of the battery 10000.

[0116] In some embodiments, such as Figures 10-12 As shown, battery modules 1000 are respectively provided on both sides of the emission assembly 2000, and the emission chamber 2001 has a spray shield 2003, which includes a particulate matter treatment component and / or a fireproof material component.

[0117] For example, when thermal runaway occurs, emissions such as flames, smoke or gas generated by the battery cell 100 can enter the emission chamber 2001. By blocking the spray nozzle 2003, the flames or conductive particles in the emissions can be effectively isolated, preventing them from being sprayed to the other side and causing secondary damage to the battery module 1000 on the other side due to thermal runaway.

[0118] For example, when conductive particles in the emissions flow through the area where the particulate matter treatment unit is located, or the area that the particulate matter treatment unit can treat, the particulate matter treatment unit can perform related operations such as capturing, collecting, limiting, or coating the particles with an insulating layer to prevent the conductive particles in the particulate matter from wandering around and causing insulation failure.

[0119] For example, when the effluent is injected into the effluent chamber 2001, the fireproof material component in the protective state can block the direct spray of flames in the effluent. That is, at least the flame part in the effluent can be blocked by the fireproof material component, which plays a more effective fireproof role and improves the problem of heat diffusion caused by thermal runaway.

[0120] In some embodiments of this application, such as Figures 10-12 The exhaust assembly 2000 has a heat exchange section 2004 on the side facing the battery module 1000. The heat exchange section 2004 exchanges heat with at least one of the battery module 1000 and the exhaust chamber 2001 to dissipate heat from at least one of the battery module 1000 and the exhaust chamber 2001, thereby achieving a cooling effect and reducing the probability of heat spread. Thus, the exhaust assembly 2000, while ensuring its exhaust function, also has a heat dissipation function.

[0121] For example, the heat exchange section 2004 may include a heat exchange cavity, which may be filled with a flowable heat exchange fluid. The heat exchange fluid can flow in the heat exchange cavity and continuously exchange heat with the exhaust material in the exhaust cavity 2001 by means of its flowability, thereby removing the heat accumulated in the exhaust cavity 2001, reducing the probability of heat concentration, improving safety, and reducing the probability of heat spread.

[0122] For example Figures 11-12 As shown, the emission assembly 2000 may include a beam 2005 and a cold plate 2006 disposed outside the beam 2005. An emission cavity 2001 is defined between the beam 2005 and the cold plate 2006. An inlet 2002 communicating with the emission cavity 2001 is formed on the cold plate 2006, and a heat exchange cavity is formed within the cold plate 2006, thus making the cold plate 2006 a heat exchange section 2004. Therefore, the emission assembly 2000 is layered, which facilitates manufacturing and increases the area for heat exchange between the heat exchange section 2004 and the battery module 1000. Simultaneously, it also increases the thermal conductivity area between the heat exchange section 2004 and the emission cavity 2001, which is beneficial for improving heat dissipation and cooling effects. The cold plate 2006 also separates the emission cavity 2001 from the battery module 1000, preventing high-temperature emissions from causing adverse thermal effects on the battery module 1000.

[0123] In some embodiments, such as Figure 10As shown, the battery 10000 may further include a housing 3000, within which multiple battery modules 1000 are disposed. That is, according to some embodiments of this application, the battery 10000 may include a housing 3000 for encapsulating one or more battery modules 1000, and the housing 3000 can prevent liquids or other foreign matter from affecting the normal operation of the battery modules 1000. Alternatively, according to other embodiments of this application, the battery 10000 may not include a housing 3000 for encapsulating one or more battery modules 1000; for example, the discharge assembly 2000 and the battery modules 1000 may be directly disposed within the electrical device 20000, etc. The multiple battery modules 1000 may be connected in series and / or in parallel, without limitation.

[0124] like Figure 10 As shown, the housing 3000 according to an embodiment of this application defines a receiving cavity 3001 for accommodating the battery module 1000, meaning the battery module 1000 can be disposed within the receiving cavity 3001. The housing 3000 includes a discharge assembly 2000 according to this application. For example, the discharge assembly 2000 can constitute a partition beam and / or side beam of the housing 3000. Therefore, the housing 3000 according to this embodiment, due to the presence of the discharge assembly 2000, can prevent conductive particles in the particulate matter emitted from the battery module 1000 from wandering around and causing insulation failure in the event of thermal runaway, thus improving safety.

[0125] Furthermore, by integrating the emission assembly 2000 into the housing 3000, the emission assembly 2000 not only performs the exhaust function but also serves as a reinforcing structure within the housing 3000. This allows the housing 3000 to reduce or even eliminate some beam structures, resulting in higher space utilization, a more compact structure, and higher energy density for the battery 10000 using this housing 3000. It should be noted that the placement of the emission assembly 2000 within the housing 3000 is not limited.

[0126] For example, such as Figure 10 As shown, the housing 3000 includes side beams and partition beams. The partition beams are located within the space enclosed by the frame to divide the space into multiple accommodating cavities 3001. At least one of the side beams and partition beams is configured as a discharge assembly 2000. In this case, the battery module 1000 can be located on the horizontal side of the discharge assembly 2000, and the battery module 1000 can be discharged horizontally in the event of thermal runaway. Furthermore, when battery modules 1000 are respectively arranged on both sides of the partition beam, and the partition beam is configured as a discharge assembly 2000, the battery modules 1000 on both sides can share the discharge assembly 2000, thereby reducing the number of discharge assemblies 2000, reducing costs, improving discharge efficiency, and improving structural compactness, thereby increasing energy density.

[0127] like Figure 13 As shown, the electrical device 20000 according to an embodiment of this application includes a battery 10000 according to any embodiment of this application, the battery 10000 being used to provide electrical energy to the electrical device 20000. This improves the safety of the electrical device 20000.

[0128] It should be noted that the type of electrical device 20000 according to the embodiments of this application is not limited, and may include, for example, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles may be fuel-powered cars, natural gas-powered cars, or new energy vehicles, and new energy vehicles may include pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles; spacecraft include airplanes, rockets, space shuttles, and spacecraft; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; 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.

[0129] For example, such as Figure 13 As shown, when the battery 10000 is used in a vehicle, it can be located at the bottom, front, or rear of the vehicle. The battery 10000 can be used to power the vehicle; for example, it can serve as the vehicle's operating power source. The vehicle may also include a controller and a motor. The controller controls the battery 10000 to supply power to the motor, for example, to meet the vehicle's power requirements during starting, navigation, and driving. In some embodiments of this application, the battery 10000 can not only serve as the vehicle's operating power source but also as its driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle.

[0130] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0131] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A packaging shell for a single battery cell, wherein, The packaging shell defines a cavity for accommodating the electrode assembly. The packaging shell includes a thin film layer and a metal layer stacked together. The metal layer has a notched area, and the portion of the thin film layer covering the notched area forms a pressure relief section.

2. The packaging shell for the battery cell according to claim 1, wherein, The thickness of the cavity is divided into two end face regions on both sides, and the end face regions connecting the two sides are called side regions. The pressure relief part is located in the side regions.

3. The packaging shell for the battery cell according to claim 2, wherein, The side region is adapted to have an electrical connection portion, and the pressure relief portion is disposed on the opposite side of the electrical connection portion.

4. The packaging shell for the battery cell according to claim 3, wherein, The pressure relief portion is adapted to be positioned on both sides of the length of the receiving cavity, along with the electrical connection portion.

5. The packaging shell for the battery cell according to claim 1, wherein, The pressure relief section is adapted to be provided at the shaft end corresponding to the electrode assembly being a wound electrode assembly.

6. The packaging shell for the battery cell according to claim 1, wherein, The pressure relief section is adapted to be disposed around the periphery of the electrode assembly, which is a stacked electrode assembly.

7. The packaging shell for the battery cell according to claim 1, wherein, The thin film layer includes an inner thin film layer covering the inside of the metal layer, and / or an outer thin film layer covering the outside of the metal layer.

8. The packaging shell for the battery cell according to claim 1, wherein, The packaging shell is formed by sealing the edges with at least one heat-sealing film, the heat-sealing film including the metal layer and the thin film layer located on both the inner and outer sides of the metal layer.

9. The packaging shell for the battery cell according to claim 8, wherein, The pressure relief section is located at the heat-sealed edge.

10. The packaging shell for the battery cell according to claim 9, wherein, The heat-sealed edge includes a weak-sealing area, the sealing strength of which is less than the sealing strength of the remaining areas of the heat-sealed edge, and the pressure relief part is located in the weak-sealing area.

11. The packaging shell for the battery cell according to claim 10, wherein, The sealing width of the weak sealing region is less than the sealing width of the other regions; or, the sealing compression amount of the weak sealing region is less than the sealing compression amount of the other regions.

12. The packaging shell for a battery cell according to any one of claims 1-11, wherein, The notched area extends through the edge of the metal layer.

13. The packaging shell for a battery cell according to any one of claims 1-11, wherein, The notched area is spaced apart from the edge of the metal layer.

14. A battery cell, wherein, The battery includes an electrode assembly and a packaging shell for a battery cell according to any one of claims 1-13, wherein the electrode assembly is disposed within the receiving cavity.

15. A battery module, wherein, It includes a module housing and at least one battery cell as described in claim 14, the battery cell being placed in a receiving space formed by the module housing.

16. The battery module according to claim 15, wherein, One side surface of the module housing is a setting surface, and an explosion-proof part is provided on the setting surface. The pressure relief part of the battery cell is arranged facing the setting surface.

17. The battery module according to claim 16, wherein, The thickness direction of each battery cell is a first direction, and the multiple battery cells in the module housing are arranged into a battery pack along the first direction. The set surface is located on one side of the multiple battery packs in a second direction, and the second direction intersects the first direction.

18. The battery module according to claim 17, wherein, The explosion-proof part is positioned at the center of the battery pack in the first direction.

19. The battery module according to any one of claims 16-18, wherein, The module housing has an electrical contact part, which is located on the opposite side of the explosion-proof part.

20. The battery module according to claim 19, wherein, The electrical contact part and the explosion-proof part are located on opposite sides of the module housing.

21. A battery, wherein, include: A battery module and an emission assembly, wherein the battery module is a battery module according to any one of claims 15-20, the emission assembly defines an emission chamber, the explosion-proof portion of the battery module is disposed toward the emission assembly, and the explosion-proof portion is adapted to eject into the emission chamber.

22. The battery according to claim 21, wherein, The battery module is provided on both sides of the emission assembly, and the emission chamber has a spray protection component, which includes a particulate matter treatment component and / or a fireproof material component.

23. The battery according to claim 21, wherein, The emission assembly has a heat exchange section on the side facing the battery module.

24. The battery according to any one of claims 21-23, wherein, It also includes a housing, in which multiple battery modules are provided, and the discharge assembly constitutes the partition beams and / or side beams of the housing.

25. An electrical appliance, wherein, include: The battery according to any one of claims 21-24.

Images