Battery cell, battery device, and electric device

Abstract

This application provides a battery cell, a battery device, and an electrical appliance. The battery cell includes a casing, an electrode assembly, and a suppression assembly. The casing has a receiving cavity, at least a portion of the electrode assembly is disposed in the receiving cavity, and the suppression assembly is disposed in the receiving cavity and connected to the casing. The suppression assembly includes a protective member and a suppression medium. The protective member is connected to the casing and has a protective cavity, and the suppression medium is disposed in the protective cavity. The protective member is configured to be actuated to release the suppression medium into the receiving cavity when the temperature inside the receiving cavity is greater than or equal to a preset temperature. The suppression medium is configured to deactivate the active material of the electrode assembly upon contact. This application is beneficial for improving the reliability of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical appliance. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, how to improve the reliability of individual battery cells is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, which helps to improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, comprising: a housing having a receiving cavity; an electrode assembly having at least a portion disposed in the receiving cavity; and a suppression assembly disposed in the receiving cavity and connected to the housing, the suppression assembly including a protective member and a suppression medium, the protective member being connected to the housing and having a protective cavity, the suppression medium being disposed in the protective cavity; the protective member being configured to be actuated to release the suppression medium into the receiving cavity when the temperature inside the receiving cavity is greater than or equal to a preset temperature, the suppression medium being configured to deactivate the active material when in contact with the active material of the electrode assembly.

[0006] In some embodiments of the first aspect, by connecting an inhibition component to the side surface of the battery cell's casing facing the receiving cavity, when the internal temperature of the battery cell rises to a temperature greater than or equal to a preset temperature, the protective component is actuated, causing the inhibition medium to be released from the protective cavity into the receiving cavity. The released inhibition medium comes into contact with the active material in the electrode assembly, causing the active material to fail, thereby inhibiting the continuous consumption of the active material in the electrode assembly when the preset temperature is exceeded. This can suppress the continuous temperature rise of the battery cell from the source, thereby reducing the possibility of thermal runaway caused by overheating of the battery cell, or slowing down the spread of thermal runaway after thermal runaway occurs in the battery cell, which is beneficial to improving the reliability of the battery cell.

[0007] In some embodiments, the protective element is any one of a plate-like structure, a U-shaped structure, and a ring-shaped structure.

[0008] In the above technical solutions, the shape of the protective component can be set to any of the above, which is beneficial to improving the flexibility of battery cells during processing and manufacturing.

[0009] In some embodiments, the battery cell is a pouch cell, and the electrode assembly includes a body portion and tabs. The body portion is disposed in the receiving cavity, and the tabs extend from the body portion to the outside of the housing.

[0010] The above technical solutions are beneficial for reducing the weight and cost of individual battery cells, and also allow for more flexible design of the size and shape of individual battery cells.

[0011] In some embodiments, the housing has a first encapsulation portion, a second encapsulation portion, and a third encapsulation portion. The first encapsulation portion and the third encapsulation portion are disposed opposite to each other along a first direction. The housing is provided with a second encapsulation portion on at least one side along a second direction. The suppression component is disposed at least partially offset from the first encapsulation portion, the second encapsulation portion, and the third encapsulation portion. The first direction intersects with the second direction.

[0012] In the above technical solution, the main body of the electrode assembly can be stably encapsulated in the shell to improve the structural stability of the battery cell, and also to reduce the interference of the suppression assembly on the shell encapsulation part, thereby improving the reliability of the battery cell.

[0013] In some embodiments, the housing further includes a bending portion, which is disposed opposite to the second encapsulation portion along a second direction. This arrangement facilitates the processing and assembly of the housing.

[0014] In some embodiments, along the second direction, the side edge of the suppression component toward the second package overlaps with the side edge of the second package toward the suppression component; and / or, along the first direction, the side edge of the suppression component toward the first package overlaps with the side edge of the first package toward the suppression component; and / or, along the first direction, the side edge of the suppression component toward the third package overlaps with the side edge of the third package toward the suppression component.

[0015] By setting it in the above manner, the area of ​​the suppression component on the housing can be increased, thereby enhancing the suppression effect of the suppression component on thermal runaway.

[0016] In some embodiments, along the first direction, the maximum dimension between the side edge of the suppression component facing the first encapsulation portion and the side edge of the first encapsulation portion away from the suppression component is L1, 0.8cm≤L1≤1.5cm; and / or, along the second direction, the maximum dimension between the side edge of the suppression component facing the second encapsulation portion and the side edge of the second encapsulation portion away from the suppression component is L2, 0.8cm≤L2≤1.5cm; and / or, along the first direction, the maximum dimension between the side edge of the suppression component facing the third encapsulation portion and the side edge of the third encapsulation portion away from the suppression component is L3, 0.8cm≤L3≤1.5cm.

[0017] In the above technical solution, the first packaging part, the second packaging part and the third packaging part can have sufficient packaging area while increasing the area of ​​the suppression component on the housing.

[0018] In some embodiments, 0.8cm≤L1≤1.5cm, and / or 0.8cm≤L1≤1.5cm, and / or 0.8cm≤L1≤1.5cm.

[0019] By setting it up in the above way, the area of ​​the suppression component on the housing can be further increased, so as to better enhance the suppression effect of the suppression component on thermal runaway.

[0020] In some embodiments, the preset temperature is T, where 70°C ≤ T ≤ 100°C; and / or, the protective element is configured to melt to actuate when the temperature within the containment cavity is greater than or equal to the preset temperature; and / or, the inhibition medium is configured to melt from a solid to a fluid when the temperature within the containment cavity is greater than or equal to the preset temperature.

[0021] In the above technical solution, the suppression component starts to function when the temperature of the battery cell exceeds the temperature value within the above range.

[0022] In some embodiments, the protective cavity is a sealed cavity, pointing from the outer shell to the suppression component, and the protective component includes a first protective layer and a second protective layer disposed on both sides of the protective cavity, with the second protective layer connected to the outer shell.

[0023] The above-described configuration facilitates the connection of the suppression components to the housing and also helps improve the sealing performance of the protective components.

[0024] In some embodiments, the protective member has an opening communicating with the protective cavity, and the housing covers the opening and is connected to the protective member.

[0025] By adopting the above-mentioned design, it is beneficial to reduce the materials and weight of protective components, thereby reducing the weight and cost of individual battery cells.

[0026] In some embodiments, the volume of the protective cavity is M1, and the volume of the suppression medium disposed in the protective cavity is M2, wherein 0.7≤M2 / M1≤0.85.

[0027] In the above technical solution, by setting the ratio of M2 / M1 within the above range, the protective cavity can have a sufficient suppressing medium to contact the active material of the electrode assembly when the protective component is activated, and the waste of the suppressing medium can be avoided, thereby reducing the overall weight of the battery cell.

[0028] In some embodiments, 0.75 ≤ M2 / M1 ≤ 0.8.

[0029] In the above technical solution, by further setting the ratio of M2 / M1 within the above range, the effect of the suppression medium and the material cost are better balanced.

[0030] In some embodiments, the battery cell further includes a solid electrolyte disposed in a receiving cavity.

[0031] The above-mentioned configuration helps to improve the energy density and performance of individual battery cells.

[0032] In some embodiments, the inhibition medium is an inorganic salt compound.

[0033] In the above technical solution, inorganic salt compounds can chemically react with the active materials in the electrode assembly to deactivate the active materials.

[0034] Secondly, this application provides a battery device including a plurality of battery cells provided in any of the embodiments of the first aspect.

[0035] Thirdly, this application provides an electrical device that includes a plurality of battery devices provided in any embodiment of the second aspect or a plurality of battery cells provided in any embodiment of the first aspect, wherein the battery cells or battery devices are used to store electrical energy or provide electrical energy.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0038] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0039] Figure 2 This application provides a schematic diagram of the structure of a battery cell assembly according to some embodiments;

[0040] Figure 3 This application provides an exploded structural diagram of a battery device according to some embodiments.

[0041] Figure 4 This application provides an exploded structural diagram of a single battery cell for some embodiments.

[0042] Figure 5 This is a schematic diagram of the structure of a single battery cell provided in some embodiments of this application;

[0043] Figure 6 A cross-sectional view of a battery cell provided for some embodiments of this application;

[0044] Figure 7 A cross-sectional view of a battery cell provided for other embodiments of this application;

[0045] Figure 8 A cross-sectional view of a battery cell provided for some embodiments of this application;

[0046] Figure 9 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0047] Figure 10 A partial cross-sectional view of a battery cell provided for other embodiments of this application.

[0048] The reference numerals in the accompanying drawings for the specific embodiments are as follows:

[0049] 1000. Vehicle; 1. Battery unit; 2. Controller; 3. Motor; 4. Battery cell assembly;

[0050] 100. Battery cell; 200. Housing; 210. First housing; 220. Second housing;

[0051] 10. Outer shell; 101. Receiving cavity; 11. Housing; 12. End cap; 13. Packaging bag; 131. First encapsulation part; 132. Second encapsulation part; 133. Third encapsulation part; 134. Bending part;

[0052] 20. Electrode assembly; 21. Main body; 22. Electrode tab;

[0053] 30. Suppression component; 31. Protective component; 301. Protective cavity; 311. First protective layer; 312. Second protective layer; 302. Opening; 32. Suppression medium;

[0054] 40. Pressure relief mechanism; 50. Electrode terminals;

[0055] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] In this application, "multiple" means two or more (including two).

[0063] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of the application areas of battery devices, the market demand is also constantly increasing.

[0064] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0065] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0066] In related technologies, if a single battery cell experiences an abnormal temperature rise during operation and is not dealt with in time, its temperature will continue to rise, leading to thermal runaway. In a short period of time, it may also cause other battery cells to undergo exothermic reactions, resulting in the entire battery device catching fire or even exploding.

[0067] To address the aforementioned technical problems, this application provides a battery cell including a casing, an electrode assembly, and a suppression assembly. The casing has a receiving cavity, and at least a portion of the electrode assembly is disposed within the receiving cavity. The suppression assembly is disposed within the receiving cavity and connected to the casing. The suppression assembly includes a protective member and a suppression medium. The protective member is connected to the casing and has a protective cavity. The suppression medium is disposed within the protective cavity. The protective member is configured to be actuated to release the suppression medium into the receiving cavity when the temperature within the receiving cavity is greater than or equal to a preset temperature. The suppression medium is configured to deactivate the active material of the electrode assembly upon contact with it.

[0068] By connecting a suppression component to the surface of the battery cell's casing facing the receiving cavity, when the internal temperature of the battery cell rises to a temperature greater than or equal to a preset temperature, the protective component is activated, causing the suppression medium to be released from the protective cavity into the receiving cavity. The released suppression medium comes into contact with the active material in the electrode assembly, causing the active material to fail, thereby suppressing the continuous consumption of the active material in the electrode assembly when the preset temperature is exceeded. This can suppress the continuous temperature rise of the battery cell from the source, thereby reducing the possibility of thermal runaway caused by overheating of the battery cell, or slowing down the spread of thermal runaway after it occurs in the battery cell, which is beneficial to improving the reliability of the battery cell.

[0069] The technical solutions described in the embodiments of this application are applicable to various battery devices or electrical equipment that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0070] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0071] For example, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a vehicle 1000 according to one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 1000 can internally house a motor 3, a controller 2, and a battery device 1. The controller 2 controls the battery device 1 to supply power to the motor 3. For example, the battery device 1 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 1 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 1 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 1000.

[0072] Please see Figure 2 and Figure 3 The battery device 1 mentioned in the embodiments of this application may include one or more battery cell assemblies 4 for providing voltage and capacity. The battery cell assembly 4 may include multiple battery cells 100, which are connected in series, parallel or mixed connection through a busbar.

[0073] In some embodiments, the battery cell assembly 4 is typically formed by arranging a plurality of battery cells 100.

[0074] As an example, the battery cell assembly 4 can be a battery module, which is formed by arranging and fixing multiple battery cells 100 together to form an independent module. As an example, the battery module can be formed by bundling multiple battery cells 100 together with cable ties.

[0075] As an example, the battery cell assembly 4 can be a battery module, and the battery cell assembly 4 can be housed in the housing 200 by fixing the battery module in the housing 200.

[0076] As an example, the battery cell assembly 4 can also be housed in the housing 200 by directly fixing multiple battery cells 100 to the housing 200.

[0077] like Figure 3 As shown, the housing 200 may include a first housing 210 and a second housing 220. The first housing 210 and the second housing 220 are fastened together to form a cavity, thereby creating a closed space inside the housing 200 to house the battery cell assembly 4. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first housing 210 may be a top cover or a bottom plate.

[0078] As an example, the housing 200 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 200 forms an enclosed space to accommodate the battery cell assembly 4.

[0079] In some embodiments, the housing 200 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 200 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 200 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0080] The box 200 can be a simple three-dimensional structure such as a cuboid or a cylinder, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids or cylinders. The embodiments of this application do not limit this.

[0081] Specifically, the housing 200 can be a metal shell made of alloy steel, alloy aluminum, etc., or a composite material shell made of metal and polypropylene, etc.

[0082] Please refer to the following: Figures 4 to 6 According to an embodiment of this application, a battery cell 100 is provided, including a housing 10, an electrode assembly 20, and a suppression assembly 30. The housing 10 has a receiving cavity 101. At least a portion of the electrode assembly 20 is disposed in the receiving cavity 101. The suppression assembly 30 is disposed in the receiving cavity 101 and connected to the housing 10. The suppression assembly 30 includes a protective member 31 and a suppression medium 32. The protective member 31 is connected to the housing 10 and has a protective cavity 301. The suppression medium 32 is disposed in the protective cavity 301. The protective member 31 is configured to be actuated to release the suppression medium 32 into the receiving cavity 101 when the temperature inside the receiving cavity 101 is greater than or equal to a preset temperature. The suppression medium 32 is configured to deactivate the active material when it comes into contact with the active material of the electrode assembly 20.

[0083] The housing 10 is a component used to form the internal environment of the battery cell 100. The internal environment formed therein can be used to house the electrode assembly 20, as well as the electrolyte and other components.

[0084] Electrode assembly 20 is a component in battery cell 100 where an electrochemical reaction occurs, and housing 10 may contain one or more electrode assemblies 20. At least part of electrode assembly 20 is disposed in receiving cavity 101, meaning that all parts of electrode assembly 20 may be located in receiving cavity 101, and electrode assembly 20 may also have a part located in receiving cavity 101 and another part extending out of receiving cavity 101.

[0085] like Figure 4 As shown, in some embodiments, the battery cell 100 is a hard-shell battery cell, and the electrode assembly 20 includes a main body 21 and tabs 22 protruding from the main body 21. The main body 21 and the tabs 22 are all located within the receiving cavity 101. In this structure, the outer shell 10 can be, but is not limited to, made of metal or non-metal materials. For example, the metal material can be copper, aluminum, or stainless steel, and the non-metal material can be polyethylene, polypropylene, or polyvinyl chloride. For example, the outer shell 10 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell 10), etc.

[0086] Optionally, when the battery cell 100 is a rigid-cased battery cell, the outer casing 10 may include a housing 11 and an end cap 12. The housing 11 has an internal cavity 101 for accommodating at least a portion of the electrode assembly 20. The housing 11 has an opening, and the end cap 12 is connected to the housing 11 to seal the opening. The housing 11 may have one or more openings. The end cap 12 may also have one or more.

[0087] like Figure 4 As shown, by way of example, the electrode assembly 20 may be provided with tabs 22 on the side facing the end cap 12 and / or the side away from the end cap 12, and the suppression assembly 30 may be connected to the side surface of the housing 11 facing the receiving cavity 101.

[0088] The shape of the outer shell 10 can be determined according to the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is a cuboid structure, a cuboid outer shell can be selected; if the electrode assembly 20 is a cylindrical structure, a cylindrical outer shell can be selected.

[0089] Optionally, such as Figure 4 As shown, in some embodiments, a pressure relief mechanism 40 is provided on the housing 10. The pressure relief mechanism 40 is used to release the internal gas of the battery cell 100. As an example, the pressure relief mechanism 40 can be integrally formed with the housing 10. As an example, the pressure relief mechanism 40 can also be separately provided with and connected to the housing 10.

[0090] In some embodiments, the housing 10 is provided with at least one electrode terminal 50, which is electrically connected to the tab 22. The electrode terminal 50 can be directly connected to the tab 22 or indirectly connected to the tab 22 through a current collector. The electrode terminal 50 can be provided on the end cap 12 or on the housing 11.

[0091] like Figure 5 and Figure 6 As shown, in some other embodiments, the battery cell 100 can also be a pouch battery cell, with the main body 21 disposed in the receiving cavity 101 and the tabs 22 extending from the main body 21 to the outside of the outer shell 10. In this structure, the outer shell 10 is supported by a soft material, which can be soft plastic or aluminum-plastic film.

[0092] In some embodiments, the electrode assembly 20 may be cylindrical, flat, or polygonal. In some embodiments, the electrode assembly 20 may be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0093] The suppression component 30 is disposed in the receiving cavity 101 and connected to the outer shell 10. The suppression component 30 is used to suppress the battery cell 100 from continuing to heat up when the temperature inside the receiving cavity 101 is greater than or equal to a preset temperature. The temperature inside the receiving cavity 101 refers to the internal temperature of the battery cell 100.

[0094] like Figure 6 As shown, specifically, the suppression component 30 includes a protective member 31 and a suppression medium 32. The protective member 31 is connected to the side surface of the housing 10 facing the receiving cavity 101 and has a protective cavity 301. The suppression medium 32 is disposed in the protective cavity 301. The protective member 31 can serve as a carrier for the suppression medium 32 to fix it to the side surface of the housing 10 facing the receiving cavity 101, so that when the battery cell 100 is operating normally, the suppression medium 32 can be better sealed in the protective cavity 301 of the protective member 31 to reduce the possibility of it coming into contact with the environment inside the receiving cavity 101 of the battery cell 100.

[0095] The protective element 31 is actuated when the temperature inside the cavity 101 is greater than or equal to a preset temperature. In this embodiment, when the temperature inside the cavity 101 is greater than or equal to the preset temperature, the battery cell 100 experiences thermal runaway or is about to experience thermal runaway. At this time, the protective element 31 is actuated to release the suppression medium 32 into the cavity 101. The suppression medium 32 causes the active material of the electrode assembly 20 to fail when it comes into contact with the active material.

[0096] The term "actuation" as used in this application refers to the protective element 31 being activated or undergoing a certain process, thereby allowing the suppression medium 32 within the protective cavity 301 to be released into the receiving cavity 101. The actions of the protective element 31 may include, but are not limited to: movement of components within the protective element 31 to form a release channel, at least a portion of the protective element 31 rupturing, breaking, tearing, or opening, or melting of the protective element 31. When the protective element 31 is actuated, the suppression medium 32 within the protective cavity 301 is discharged outward from the actuated portion. This method enables the active material of the electrode assembly 20 to be deactivated at temperatures greater than or equal to a preset temperature, thereby preventing potentially more serious accidents.

[0097] When the suppressing medium 32 comes into contact with the active material of the electrode assembly 20, it causes the active material to become inactive. The suppressing medium 32 can be fixed to the outer casing 10 by the protective member 31, facilitating its connection with the outer casing 10. Specifically, when the suppressing medium 32 comes into contact with the active material of the electrode assembly 20, it can undergo a chemical reaction with it, causing it to lose its activity and become inactive. Alternatively, when the suppressing medium 32 comes into contact with the active material of the electrode assembly 20, it can also form a passivation layer to cover the active material, causing it to become inactive and preventing further consumption of the active material. Active material inactivation means that the battery cell 100 will no longer continue to charge and discharge, thereby preventing its temperature from rising further.

[0098] The electrode assembly 20 includes a positive electrode sheet and a negative electrode sheet. The positive electrode sheet may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector. The negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector. In this embodiment, the positive active material on the positive electrode sheet and the negative active material on the negative electrode sheet are collectively referred to as the active material of the electrode assembly 20.

[0099] The tab 22 includes a positive tab and a negative tab, both of which protrude from the main body 21. The main body 21 is the part of the positive and negative electrode sheets coated with active material, the positive tab 22 is the part of the positive electrode sheet that is not coated with positive active material, and the negative tab 22 is the part of the negative electrode sheet that is not coated with negative active material.

[0100] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co The following are included: 0.25Mn0.25O2 (also known as NCM211), LiNi0.6Co0.2Mn0.2O2 (also known as NCM622), LiNi0.8Co0.1Mn0.1O2 (also known as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.8Co0.15Al0.05O2), and their modified compounds. Modified compounds refer to substances obtained by doping or coating, etc., based on the above-mentioned materials.

[0101] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0102] In some embodiments, the inhibition medium 32 is an inorganic salt compound.

[0103] Among them, the inorganic salt compound is a material that can chemically react with the active material of the electrode assembly 20 and cause the active material to become ineffective. The inorganic salt compound may include, but is not limited to, any one of Na3PO4, H3[P(Mo3O10)4], etc. The materials of the protective component 31 and the suppressing medium 32 can be selected according to the preset temperature. The range of the preset temperature can be set according to the usage requirements of different specifications of battery cells 100.

[0104] The battery cell 100 provided in some embodiments of this application has an inhibition component 30 connected to the side surface of its outer casing 10 facing the receiving cavity 101. When the temperature inside the receiving cavity 101 of the battery cell 100 rises abnormally to a temperature greater than or equal to a preset temperature, the protective component 31 is actuated, causing the inhibition medium 32 to be released from the protective cavity 301 into the receiving cavity 101. The released inhibition medium 32 comes into contact with the active material in the electrode assembly 20, causing the active material to fail, thereby inhibiting the continuous consumption of the active material in the electrode assembly 20 when the temperature exceeds the preset temperature. This can inhibit the continuous temperature rise of the battery cell 100 from the source, thereby reducing the possibility of thermal runaway caused by overheating of the battery cell 100, or slowing down the spread of thermal runaway after thermal runaway occurs in the battery cell 100, which is beneficial to improving the reliability of the battery cell 100.

[0105] The connection between the suppression component 30 and the housing 10 can be achieved by bonding, welding, or using other components.

[0106] Optionally, the protective component 31 in this embodiment is a material that does not react with the electrolyte under normal use of the battery cell 100, and the inhibition medium 32 in this embodiment can be a material that does not react with the electrolyte under normal use of the battery cell 100, or it can be a material that reacts with the electrolyte under normal use of the battery cell 100.

[0107] In some embodiments, the protective cavity 301 of the protective member 31 may be a sealed cavity so that the inhibition medium 32 can always be contained in the protective cavity 301 when the temperature of the battery cell 100 does not reach the preset temperature value. In this structure, the inhibition medium 32 may be a material that reacts with the active material of the electrode assembly below the preset temperature, or it may be a material that does not react with the active material of the electrode assembly below the preset temperature.

[0108] Alternatively, the protective cavity 301 of the protective member 31 can also be a non-sealed cavity. Optionally, after the protective member 31 is connected to the housing 10, the housing 10 can seal the non-sealed part of the non-sealed cavity. In this structure, the suppression medium 32 can be a material that reacts with the active material of the electrode assembly below a preset temperature, or it can be a material that does not react with the active material of the electrode assembly below a preset temperature.

[0109] Optionally, the protective element 31 can also be configured as a mesh structure, having holes that connect the receiving cavity 101 and the protective cavity 301. In this structure, the suppression medium 32 is a material that does not react with the active material of the electrode assembly below a preset temperature.

[0110] Optionally, the protective component 31 can be a structure with a certain degree of rigidity or a soft, bag-like structure. Optionally, the protective component 31 is supported by an insulating material, and the protective component 31 can be made of an organosilicon polymer, which may include materials such as polysiloxane.

[0111] Optionally, the suppression component 30 connected to the housing 10 can be one or more. When there are multiple suppression components 30, the edges of the multiple suppression components 30 can overlap, or the multiple suppression components 30 can be spaced apart from each other.

[0112] As an example, in order to improve the assembly efficiency of the suppression component 30 and reduce the processing difficulty of the suppression component 30, the suppression component 30 is positioned on a different side of the housing 10 than the tab 22.

[0113] In some embodiments, the protective element 31 is any one of a plate-like structure, a U-shaped structure, and a ring-shaped structure.

[0114] The protective component 31 can be plate-shaped, which facilitates its processing and manufacturing, and also facilitates its connection and assembly with the housing 10. Optionally, the plate-shaped protective component 31 connected to the housing 10 can be one or multiple. When there is one protective component 31, it can be connected to either side of the housing 10 opposite to the electrode assembly 20. When there are multiple protective components 31, they are staggered to reduce the overlap of the suppression assembly 30 and thus reduce the space occupied by the receiving cavity 101. Optionally, the protective component 31 can be a rectangular plate-shaped structure, a circular plate-shaped structure, or a plate-shaped structure of other shapes.

[0115] The protective component 31 can also be configured as a U-shaped structure. After the U-shaped protective component 31 is connected to the outer shell 10, it can cover three sides of the electrode assembly 20. This is beneficial to improve the inhibition effect on the active material of the electrode assembly 20 at a preset temperature, while reducing the assembly process between the protective component 31 and the outer shell 10.

[0116] The protective component 31 can also be configured as a ring structure. When the ring-shaped protective component 31 is connected to the outer shell 10, when the electrode assembly 20 is cylindrical, the ring-shaped protective component 31 can cover the arc side of the electrode assembly 20. When the electrode assembly 20 is rectangular, the ring-shaped protective component 31 can cover the four adjacent sides of the electrode assembly 20. This is beneficial to improve the inhibition effect on the active material of the electrode assembly 20 at a preset temperature, while reducing the assembly process between the protective component 31 and the outer shell 10.

[0117] The shape of the protective member 31 of the battery cell 100 provided in some embodiments of this application can be set to any of the above, which is beneficial to improving the flexibility of the battery cell 100 in processing and manufacturing.

[0118] Please see Figures 6 to 8 In some embodiments, the battery cell 100 is a pouch battery cell, and the electrode assembly 20 includes a main body 21 and a tab 22. The main body 21 is disposed in the receiving cavity 101, and the tab 22 extends from the main body 21 to the outside of the outer casing 10.

[0119] As an example, the outer casing 10 includes a packaging bag 13, with tabs 22 extending from the main body 21 to the outside of the packaging bag 13.

[0120] The packaging bag 13 is used to wrap and encapsulate the electrode assembly 20, wherein the main body 21 of the electrode assembly 20 is housed inside the packaging bag 13, a portion of the tabs 22 is housed inside the packaging bag 13, and another portion extends from the main body 21 to the outside of the packaging bag 13, or all the tabs 22 extend from the main body 21 to the outside of the packaging bag 13.

[0121] Soft-pack battery cells have the characteristics of flexible packaging, lightweight and uniform heat dissipation, high energy density, thinness and adaptability to irregular shapes.

[0122] By setting the battery cell 100 as a pouch battery cell, its outer casing 10 can be set as a packaging bag 13. The packaging bag 13 has good flexibility and extensibility, which can adapt to the volume change of the electrode assembly 20 during charging and discharging, thereby reducing the risk of explosion of the battery cell 100 and improving the reliability of the battery cell 100. In addition, the packaging bag 13 also has the advantage of low weight, which is conducive to reducing the weight and cost of the battery cell 100. Furthermore, it can make the size and shape of the battery cell 100 more flexible in design, so that it can be adapted to different structures, which is conducive to improving the flexibility of use of the battery cell 100.

[0123] The tab 22 serves as a connection component between the main body 21 of the electrode assembly 20 and the external circuit. It is used to transmit current and realize the charging and discharging function of the battery. The above-mentioned arrangement also facilitates the connection between the tab 22 and the external circuit.

[0124] In some embodiments, the packaging bag 13 may be made of a soft material such as aluminum-plastic film to improve the lightness and flexibility of the battery cell 100.

[0125] Optionally, the position of the suppression component 30 on the housing 10 is offset from the position of the tab 22. For example, if the tab 22 protrudes from the main body 21 along the first direction X, the suppression component 30 can be connected to the housing 10 along the third direction Z or the second direction Y. This facilitates the two components from interfering with each other during assembly, reduces assembly difficulty, and makes it easier to process the suppression component 30 so that it does not need to consider how to avoid the tab 22 during processing.

[0126] Wherein, the first direction X can be the height direction of the battery cell 100, the second direction Y can be the length direction of the battery cell 100, and the third direction Z can be the width direction of the battery cell 100.

[0127] The tab 22 includes a positive tab and a negative tab with opposite polarities. The positive tab and the negative tab can be located together at one end of the main body 21 or at two ends of the main body 21 respectively.

[0128] Please continue reading. Figures 6 to 8 In some embodiments, the housing 10 has a first encapsulation portion 131, a second encapsulation portion 132 and a third encapsulation portion 133. The first encapsulation portion 131 and the third encapsulation portion 133 are disposed opposite to each other along a first direction X. The housing 10 is provided with a second encapsulation portion 132 on at least one side along a second direction Y. The suppression component 30 is at least partially offset from the first encapsulation portion 131, the second encapsulation portion 132 and the third encapsulation portion 133 respectively. The first direction X intersects with the second direction Y.

[0129] It can also be understood that the orthographic projection of the suppression component 30 along the third direction Z is at least partially offset from the orthographic projection of the first encapsulation portion 131 along the third direction Z, the orthographic projection of the suppression component 30 along the third direction Z is at least partially offset from the orthographic projection of the second encapsulation portion 132 along the third direction Z, and the orthographic projection of the suppression component 30 along the third direction Z is at least partially offset from the orthographic projection of the third encapsulation portion 133 along the third direction Z.

[0130] It should be noted that when the battery cell 100 is a pouch battery cell, the edge of the outer casing 10 needs to be heat-sealed to form a receiving cavity 101 for accommodating the main body 21 of the electrode assembly 20. Therefore, by setting it in the above manner, the main body 21 of the electrode assembly 20 can be stably encapsulated in the outer casing 10, thereby improving the structural stability of the battery cell 100 and reducing the interference of the suppression component 30 on the encapsulated part of the outer casing 10, which facilitates assembly and improves the reliability of the battery cell 100.

[0131] The first encapsulation part 131 and the third encapsulation part 133 are respectively connected to the second encapsulation part 132, which helps to improve the sealing of the accommodating cavity 101.

[0132] Optionally, the suppression component 30 may be completely offset from the first encapsulation part 131, the second encapsulation part 132 and the third encapsulation part 133 respectively, that is, there are gaps between the suppression component 30 and the first encapsulation part 131, the second encapsulation part 132 and the third encapsulation part 133 respectively.

[0133] Optionally, the suppression component 30 may be partially offset from the first encapsulation portion 131, the second encapsulation portion 132, and the third encapsulation portion 133, respectively. As an example, the edge of the suppression component 30 may contact the edge of the first encapsulation portion 131, the edge of the second encapsulation portion 132, and the edge of the third encapsulation portion 133, respectively, to form overlapping portions of the edges.

[0134] After the outer casing 10 is formed, it has at least three encapsulation parts, such as Figure 7 As shown, optionally, the outer casing 10 can be formed by heat-sealing two aluminum-plastic films. The outer casing 10 may include a first bag and a second bag, which are joined and sealed along a third direction Z to form a first encapsulation portion 131 and a third encapsulation portion 133 oppositely arranged along a first direction X, and two second encapsulation portions 132 oppositely arranged along a second direction Y; or, as shown... Figure 6 and Figure 8 As shown, the outer shell 10 can also be formed by folding and then heat-pressing an aluminum-plastic film. The outer shell 10 may only include a third bag body, which is bent to be sealed, to form a first sealing part 131 and a third sealing part 133 arranged opposite to each other along the first direction X, and a second sealing part 132 and a bent part arranged opposite to each other along the second direction Y.

[0135] Please see Figure 6 and Figure 8 In some embodiments, the housing 10 also has a bending portion 134, which is disposed opposite to the second encapsulation portion 132 along the second direction Y.

[0136] The first encapsulation part 131 and the third encapsulation part 133 are respectively connected to the second encapsulation part 132 and also to the bending part 134 to improve the sealing of the receiving cavity 101.

[0137] By setting it in the above manner, it is beneficial to reduce the manufacturing process, improve the manufacturing efficiency, and also make the outer shell 10 fit the electrode assembly 20 better.

[0138] Optionally, a suppression component 30 may be attached to the side surface of the bent portion 134 facing the receiving cavity 101.

[0139] Please see Figure 6 and Figure 7 Along the second direction Y, the suppression component 30 is spaced apart from the side edge of the second encapsulation portion 132 facing the suppression component 30; and / or, along the first direction X, the suppression component 30 is spaced apart from the side edge of the first encapsulation portion 131 facing the suppression component 30; and / or, along the first direction X, the suppression component 30 is spaced apart from the side edge of the third encapsulation portion 133 facing the suppression component 30.

[0140] By setting it in the above manner, the interference between the suppression component 30 and the first encapsulation part 131, the second encapsulation part 132 and the third encapsulation part 133 is reduced, which is beneficial to improving the manufacturing efficiency and production quality of the battery cell 100.

[0141] Please see Figure 8 In some embodiments, along the second direction Y, the suppression component 30 overlaps with the side edge of the second encapsulation portion 132 facing the suppression component 30 along the second direction Y; and / or, along the first direction X, the suppression component 30 overlaps with the side edge of the first encapsulation portion 131 facing the suppression component 30 along the first direction X; and / or, along the first direction X, the suppression component 30 overlaps with the side edge of the third encapsulation portion 133 facing the suppression component 30 along the third direction X.

[0142] By setting it in the above manner, the arrangement area of ​​the suppression component 30 on the housing 10 can be increased, thereby enhancing the suppression effect of the suppression component 30 on thermal runaway.

[0143] In some embodiments, along the first direction X, the maximum dimension between the side edge of the suppression component 30 facing the first encapsulation portion 131 and the side edge of the first encapsulation portion 131 away from the suppression component 30 is L1, where 0.8cm≤L1≤1.5cm.

[0144] L1 can be understood as the maximum distance between the suppression component 30 and the first encapsulation part 131 on the same side in the first direction X. By setting the value of L1 between 0.8cm and 1.5cm, including the two endpoint values ​​of 0.8cm and 1.5cm, the first encapsulation part 131 can have a sufficient encapsulation area to improve the sealing of the shell 10 and reduce the possibility of external gas and impurities entering the receiving cavity 101 through the first encapsulation part 131. At the same time, it can also make the arrangement area of ​​the suppression component 30 on the shell 10 larger, so that the suppression medium 32 can cover and contact more active materials at the preset temperature, thereby accelerating the failure rate of active materials and thus better improving the effect of the suppression component 30 in suppressing the continued heating of the battery cell 100 at the preset temperature.

[0145] In some embodiments, along the second direction Y, the maximum dimension between the side edge of the suppression component 30 facing the second encapsulation portion 132 and the side edge of the second encapsulation portion 132 away from the suppression component 30 is L2, 0.8cm≤L2≤1.5cm.

[0146] L2 can be understood as the maximum distance between the suppression component 30 and the second encapsulation part 132 on the same side in the second direction Y. By setting the value of L2 between 0.8cm and 1.5cm, including the two endpoint values ​​of 0.8cm and 1.5cm, the second encapsulation part 132 can have a sufficient encapsulation area to improve the sealing of the shell 10 and reduce the possibility of external gas and impurities entering the receiving cavity 101 through the second encapsulation part 132. At the same time, it can also make the arrangement area of ​​the suppression component 30 on the shell 10 larger, so that the suppression medium 32 can cover and contact more active materials at the preset temperature, thereby accelerating the rate of active material failure and thus better improving the effect of the suppression component 30 in suppressing the continued heating of the battery cell 100 at the preset temperature.

[0147] In some embodiments, along the first direction X, the maximum dimension between the side edge of the suppression component 30 facing the third encapsulation portion 133 and the side edge of the third encapsulation portion 133 away from the suppression component 30 is L3, 0.8cm≤L3≤1.5cm.

[0148] L3 can be understood as the maximum distance between the suppression component 30 and the third encapsulation part 133 on the same side in the first direction X. By setting the value of L3 between 0.8cm and 1.5cm, including the two endpoint values ​​of 0.8cm and 1.5cm, the third encapsulation part 133 can have a sufficient encapsulation area to improve the sealing of the shell 10 and reduce the possibility of external gas and impurities entering the receiving cavity 101 through the third encapsulation part 133. At the same time, it can also make the arrangement area of ​​the suppression component 30 on the shell 10 larger, so that the suppression medium 32 can cover and contact more active materials at the preset temperature, thereby accelerating the failure rate of active materials and thus better improving the effect of the suppression component 30 in suppressing the continued heating of the battery cell 100 at the preset temperature.

[0149] Furthermore, by setting the values ​​of L1, L2, and L3 within the aforementioned range, it is also convenient to position the suppression component 30 on the housing 10. The size and arrangement area of ​​the suppression component 30 can be designed according to the aforementioned value range, which facilitates the connection and assembly of the suppression component 30 and the housing 10, and helps to improve the assembly efficiency of the battery cell 100.

[0150] Furthermore, in some embodiments, 1cm≤L1≤1.2cm, and / or, 1cm≤L2≤1.2cm, and / or, 1cm≤L3≤1.2cm.

[0151] By setting the values ​​of L1, L2 and L3 between 0.8cm and 1.5cm respectively, and including two endpoint values ​​of 0.8cm and 1.5cm respectively, the arrangement area of ​​the suppression component 30 on the housing 10 can be further increased, so as to better enhance the suppression effect of the suppression component 30 on thermal runaway.

[0152] It should be noted that when the edge of the suppression component 30 facing the first encapsulation portion 131 overlaps with the edge of the first encapsulation portion 131 facing the suppression component 30 along the first direction X, that is, the maximum dimension of the first encapsulation portion 131 along the first direction X is L1; when the edge of the suppression component 30 facing the second encapsulation portion 132 overlaps with the edge of the second encapsulation portion 132 facing the suppression component 30 along the second direction Y, the maximum dimension of the second encapsulation portion 132 along the second direction Y is L2; ​​when the edge of the suppression component 30 facing the third encapsulation portion 133 overlaps with the edge of the third encapsulation portion 133 facing the suppression component 30 along the first direction X, the maximum dimension of the third encapsulation portion 133 along the first direction X is L3.

[0153] In some embodiments, the preset temperature T is 70℃≤T≤100℃.

[0154] In other words, the protective component 31 can be actuated between 70°C and 100°C. When the temperature of the battery cell 100 reaches this range, the protective component 31 is actuated to release the suppression medium 32.

[0155] As an example, the value of T can be, but is not limited to, 70℃, 75℃, 80℃, 85℃, 90℃, 95℃, 100℃, etc.

[0156] Furthermore, 80℃≤T≤90℃.

[0157] By further setting the value of T between 80°C and 90°C, including the two endpoint values ​​of 80°C and 90°C, the temperature requirements of a larger capacity battery cell during normal cycling can be met.

[0158] In some embodiments, the protective member 31 is configured to melt and actuate when the temperature within the receiving cavity 101 is greater than or equal to a preset temperature.

[0159] By setting it in this way, the protective component 31 can melt when the temperature exceeds the preset temperature, which helps to increase the rate at which the suppression medium 32 is released from the protective cavity 301 to the receiving cavity 101, thereby accelerating its contact rate with the active material of the electrode assembly 20, and thus improving the rate at which the suppression assembly 30 suppresses thermal runaway.

[0160] In some embodiments, the suppression medium 32 is configured to melt from a solid to a fluid when the temperature within the containment cavity 101 is greater than or equal to a preset temperature.

[0161] In other words, the melting point of the suppression medium 32 is between 70°C and 100°C. When the temperature of the battery cell 100 reaches this range, the protective component 31 is activated to release the suppression medium 32. The suppression medium 32 forms a fluid to contact the active material of the electrode assembly 20, thereby causing the active material to fail. The fluid suppression medium 32 can diffuse more quickly to contact the active material, which helps to better reduce the possibility of thermal runaway and the possibility of thermal runaway spreading.

[0162] The inhibition medium 32 can be made of a low-melting-point inorganic salt compound.

[0163] The protective component can be a solid phase change material. When the battery cell 100 experiences thermal runaway, the solid phase change material turns into a liquid state to suppress thermal runaway.

[0164] Please see Figure 9 In some embodiments, the protective cavity 301 is a sealed cavity, pointing from the outer shell 10 to the suppression component 30. The protective component 31 includes a first protective layer 311 and a second protective layer 312 disposed on both sides of the sealed cavity. The second protective layer 312 is connected to the outer shell 10.

[0165] The above-described configuration facilitates the connection of the suppression component 30 to the housing 10 and also helps to improve the sealing performance of the protective component 31.

[0166] Please see Figure 9 In some embodiments, the protective member 31 has an opening 302 communicating with the protective cavity 301, and the outer shell 10 covers the opening 302 and is connected to the protective member 31.

[0167] In other words, during the assembly process, the suppressing medium 32 can first be contained in the protective cavity 301 through the open port 302, and then the protective component 31 is connected to the outer shell 10 so that the protective cavity 301 is a sealed structure.

[0168] By adopting the above-mentioned design, it is beneficial to reduce the material and weight of the protective component 31, thereby reducing the weight and cost of the battery cell 100.

[0169] In some embodiments, the volume of the protective cavity 301 is M1, and the volume of the suppression medium 32 disposed in the protective cavity 301 is M2, wherein 0.7≤M2 / M1≤0.85.

[0170] In other words, the volume of the suppressing medium 32 filling the protective cavity 301 is between 0.7 and 0.85 of the volume of the protective cavity 301. As an example, the ratio of M2 / M1 can be, but is not limited to, 0.7, 0.5, 0.8, 0.85, etc.

[0171] If the ratio is designed to be too small, i.e., M2 / M1 < 0.7, the amount of suppressing medium 32 may be too small, which may prevent it from contacting all the active materials after release, making the battery cell 100 still have the possibility of heating up, and also wasting the space of the protective cavity 301. On the other hand, if the ratio is designed to be too large, i.e., M2 / M1 > 0.85, the amount of suppressing medium 32 may be too large, resulting in material waste, increased weight and cost, and also increasing the difficulty of assembly.

[0172] Therefore, by setting M2 / M1 between 0.7 and 0.85, including the two endpoint values ​​of 0.7 and 0.85, the protective cavity 301 can have a sufficient amount of suppression medium 32 to contact the active material of the electrode assembly 20 when the protective member 31 is actuated. This also avoids the waste of suppression medium 32, reduces the overall weight of the battery cell 100, and facilitates the placement of a suitable filling volume of suppression medium 32 in the protective cavity 301.

[0173] Furthermore, in some embodiments, 0.75 ≤ M2 / M1 ≤ 0.8.

[0174] By further setting M2 / M1 between 0.75 and 0.8, including two endpoint values ​​of 0.75 and 0.8, not only is the functionality and space utilization of the suppression component 30 taken into account, but also the overall performance and manufacturing cost of the battery cell 100, which can better balance the effect of the suppression medium 32 and the material cost.

[0175] In this application embodiment, the battery cell 100 can be a liquid battery cell or a solid battery cell. A liquid battery cell refers to a cell containing a liquid electrolyte, and a solid battery cell refers to a cell containing a solid electrolyte.

[0176] In some embodiments, the battery cell 100 further includes a solid electrolyte disposed in the receiving cavity 101.

[0177] Solid electrolytes are non-flammable and non-explosive, which can greatly improve the reliability of the battery cell 100. In addition, solid electrolytes are thinner, which is also conducive to improving the structural compactness or energy density of the battery cell 100.

[0178] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0179] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0180] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0181] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0182] As an example, the battery cell 100 is an all-solid-state battery cell, the electrode assembly 20 includes only a positive electrode and a negative electrode, and the tabs 22 include a positive tab 22 and a negative tab 22. Both the positive tab 22 and the negative tab 22 protrude from the main body 21. The main body 21 is the part of the positive electrode and the negative electrode coated with active material, the positive tab 22 is the part of the positive electrode that is not coated with active material, and the negative tab 22 is the part of the negative electrode that is not coated with active material. This arrangement is beneficial to further improve the reliability, energy density and structural compactness of the battery cell 100.

[0183] As an example, the electrode assembly 20 provided in this application embodiment has a stacked structure.

[0184] According to some embodiments of this application, this application also provides a battery device 1, including a plurality of battery cells 100 provided in any of the above embodiments.

[0185] According to some embodiments of this application, this application also provides an electrical device, including a plurality of battery cells 100 provided in any of the embodiments or a battery device 1 provided in any of the embodiments, wherein the battery cells 100 or the battery device 1 are used to store or provide electrical energy.

[0186] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application.

[0187] Please refer to the following: Figures 5 to 10 According to some embodiments of this application, this application provides an all-solid-state soft-pack battery cell 100, including a packaging bag 13, an electrode assembly 20, a suppression assembly, and a solid electrolyte.

[0188] The packaging bag 13 has a receiving cavity 101, in which a solid electrolyte is disposed. The electrode assembly 20 includes a main body 21 and an electrode tab 22. The main body 21 is disposed in the receiving cavity 101, and the electrode tab 22 extends from the main body 21 to the outside of the receiving cavity 101.

[0189] An inhibition component 30 is disposed in the receiving cavity 101 and connected to the packaging bag 13. The inhibition component 30 includes a protective member 31 and an inhibition medium 32. The protective member 31 is any one of a plate-shaped structure, a U-shaped structure, and a ring-shaped structure. The protective member 31 is connected to the side surface of the packaging bag 13 facing the receiving cavity 101 and has a protective cavity 301. The inhibition medium 32 is disposed in the protective cavity 301 and is an inorganic salt compound. The volume of the protective cavity 301 is M1, and the volume of the inhibition medium 32 disposed in the protective cavity 301 is M2, wherein 0.7 ≤ M2 / M1 ≤ 0.85.

[0190] The protective cavity 301 is a sealed cavity, pointing from the packaging bag 13 towards the suppression component 30. The protective component 31 includes a first protective layer 311 and a second protective layer 312 disposed on both sides of the protective cavity 301. The second protective layer 312 is connected to the packaging bag 13. Alternatively, the protective component 31 has an open opening 302 communicating with the protective cavity 301, and the packaging bag 13 covers the open opening 302 and is connected to the protective component 31. The protective component 31 is configured to melt when the temperature inside the receiving cavity 101 is greater than or equal to a preset temperature T to release the suppression medium 32 into the receiving cavity 101. The suppression medium 32 is configured to melt from a solid to a fluid at a temperature greater than or equal to the preset temperature T, and to deactivate the active material of the electrode component 20 upon contact, with a temperature of 70℃≤T≤100℃.

[0191] The packaging bag 13 has a first sealing part 131, a second sealing part 132, a third sealing part 133, and a bending part 134. The first sealing part 131 and the third sealing part 133 are arranged opposite to each other along a first direction X. The bending part 134 is arranged opposite to the second sealing part 132 along a second direction Y. Along the second direction Y, the edge of the suppressing component 30 facing the second sealing part 132 overlaps with the edge of the second sealing part 132 facing the suppressing component 30. Along the first direction X, the edge of the suppressing component 30 facing the first sealing part 131 overlaps with the edge of the first sealing part 131 facing the suppressing component 30. The edge of the suppressing component 30 facing the third sealing part 133 overlaps with the edge of the third sealing part 133 facing the suppressing component 30.

[0192] Along the first direction X, the maximum dimension between the side edge of the suppression component 30 facing the first encapsulation portion 131 and the side edge of the first encapsulation portion 131 away from the suppression component 30 is L1, 0.8cm≤L1≤1.5cm. Along the second direction Y, the maximum dimension between the side edge of the suppression component 30 facing the second encapsulation portion 132 and the side edge of the second encapsulation portion 132 away from the suppression component 30 is L2, 0.8cm≤L2≤1.5cm. Along the first direction X, the maximum dimension between the side edge of the suppression component 30 facing the third encapsulation portion 133 and the side edge of the third encapsulation portion 133 away from the suppression component 30 is L3, 0.8cm≤L3≤1.5cm.

[0193] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0194] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery cell, characterized in that, include: The outer shell has a receiving cavity; An electrode assembly, at least a portion of which is disposed in the receiving cavity; An inhibition component is disposed in the receiving cavity and connected to the outer shell. The inhibition component includes a protective member and an inhibition medium. The protective member is connected to the outer shell and has a protective cavity. The inhibition medium is disposed in the protective cavity. The protective element is configured to be actuated to release the inhibition medium into the cavity when the temperature within the cavity is greater than or equal to a preset temperature. The inhibition medium is configured to deactivate the active material of the electrode assembly upon contact with it.

2. The battery cell according to claim 1, characterized in that, The protective component is any of the following: plate-shaped structure, U-shaped structure, and ring-shaped structure.

3. The battery cell according to claim 1 or 2, characterized in that, The battery cell is a pouch cell, and the electrode assembly includes a main body and tabs. The main body is disposed in the receiving cavity, and the tabs extend from the main body to the outside of the outer shell.

4. The battery cell according to claim 3, characterized in that, The housing has a first encapsulation part, a second encapsulation part, and a third encapsulation part. The first encapsulation part and the third encapsulation part are disposed opposite to each other along a first direction. The second encapsulation part is provided on at least one side of the housing along a second direction. The suppression component is disposed at least partially offset from the first encapsulation part, the second encapsulation part, and the third encapsulation part. The first direction intersects the second direction.

5. The battery cell according to claim 4, characterized in that, The outer casing also has a bending portion, which is disposed opposite to the second encapsulation portion along the second direction.

6. The battery cell according to claim 4, characterized in that, Along the second direction, the suppression component faces one side edge of the second package portion, which overlaps with one side edge of the second package portion facing the suppression component; and / or, along the first direction, the suppression component faces one side edge of the first package portion, which overlaps with one side edge of the first package portion facing the suppression component; and / or, along the first direction, the suppression component faces one side edge of the third package portion, which overlaps with one side edge of the third package portion facing the suppression component.

7. The battery cell according to claim 4, characterized in that, Along the first direction, the maximum dimension between the side edge of the suppression component facing the first encapsulation portion and the side edge of the first encapsulation portion away from the suppression component is L1, 0.8cm≤L1≤1.5cm; And / or, along the second direction, the maximum dimension between the side edge of the suppression component facing the second encapsulation portion and the side edge of the second encapsulation portion away from the suppression component is L2, 0.8cm≤L2≤1.5cm; And / or, along the first direction, the maximum dimension between the side edge of the suppression component facing the third encapsulation portion and the side edge of the third encapsulation portion away from the suppression component is L3, 0.8cm≤L3≤1.5cm.

8. The battery cell according to claim 7, characterized in that, 1cm≤L1≤1.2cm, and / or, 1cm≤L2≤1.2cm, and / or, 1cm≤L3≤1.2cm.

9. The battery cell according to claim 1 or 2, characterized in that, The preset temperature is T, where 70℃≤T≤100℃; And / or, the protective element is configured to melt to actuate when the temperature within the receiving cavity is greater than or equal to the preset temperature; And / or, the suppression medium is configured to melt from a solid to a fluid when the temperature within the containment cavity is greater than or equal to the preset temperature.

10. The battery cell according to claim 1 or 2, characterized in that, The protective cavity is a sealed cavity, extending from the outer shell towards the suppression component. The protective component includes a first protective layer and a second protective layer disposed on both sides of the protective cavity, with the second protective layer connected to the outer shell.

11. The battery cell according to claim 1 or 2, characterized in that, The protective component has an opening that communicates with the protective cavity, and the outer shell covers the opening and is connected to the protective component.

12. The battery cell according to claim 1 or 2, characterized in that, The volume of the protective cavity is M1, and the volume of the suppression medium disposed in the protective cavity is M2, wherein 0.7≤M2 / M1≤0.

85.

13. The battery cell according to claim 12, characterized in that, 0.75≤M2 / M1≤0.

8.

14. The battery cell according to claim 1 or 2, characterized in that, The battery cell also includes a solid electrolyte, which is disposed in the receiving cavity.

15. The battery cell according to claim 1 or 2, characterized in that, The inhibition medium is an inorganic salt compound.

16. A battery device, characterized in that, It includes multiple battery cells according to any one of claims 1 to 15.

17. An electrical appliance, characterized in that, It includes a plurality of battery devices as described in claim 16 or a plurality of battery cells as described in any one of claims 1 to 15, wherein the battery cells or the battery devices are used to store electrical energy or provide electrical energy.

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