Battery cell, battery device, energy storage device, energy storage system, and charging network

Abstract

This application relates to the field of battery equipment technology, disclosing a battery cell, battery device, energy storage device, energy storage system, and charging network. The battery cell includes a housing, electrode terminals, a pressure relief mechanism, an electrode assembly, and an insulating component. The housing's dimension along a third direction is larger than its dimension along a first direction, and the housing's dimension along the first direction is larger than its dimension along a second direction. The electrode assembly is disposed within the housing and includes a main body and tabs. The tabs are electrically connected to the electrode terminals. Gaps exist between the main body and the first sidewall of the housing, and between the main body and the second sidewall of the housing. The insulating component covers the electrode assembly, and a protrusion is provided in an area corresponding to at least one of the first and second sidewalls of the insulating component, with the protrusion abutting against the corresponding sidewall. This technical solution aims to reduce the possibility of the gas guide path being blocked by the electrode assembly during thermal runaway of the battery cell, thereby allowing high-temperature, high-pressure flue gas to flow smoothly and orderly to the pressure relief mechanism for directional pressure relief.

Description

Technical Field

[0001] This application belongs to the field of battery equipment technology, and in particular relates to a battery cell, battery device, energy storage device, energy storage system and charging network. Background Technology

[0002] In the structural design of a battery cell, a gap is typically reserved between the electrode assembly and the two long sidewalls of the casing to form a gas guiding path. This path guides the high-temperature, high-pressure flue gas generated during thermal runaway towards the pressure relief mechanism, thereby achieving directional pressure relief and reducing the risks associated with disordered internal pressure release. However, in practical applications, when thermal runaway occurs inside the battery cell, the electrode assembly is prone to shifting relative to the casing under internal high pressure. This causes the electrode assembly to directly press against the long sidewalls of the casing, resulting in partial or complete blockage of the gas guiding path. This blockage prevents the high-temperature, high-pressure flue gas from flowing smoothly and orderly to the pressure relief mechanism, causing it to accumulate in localized areas and continue to heat up. This can lead to the melting of metal components, forming molten beads, such as aluminum beads. The presence of these molten beads can melt through the casing or damage insulating components, leading to internal short circuits. Furthermore, the localized accumulation of high-temperature, high-pressure flue gas can easily cause non-directional rupture of the casing, severely affecting the reliability of the battery cell. Utility Model Content

[0003] The purpose of this application is to provide a battery cell, battery device, energy storage device, energy storage system and charging network, which aims to reduce the possibility that the gas guide path of the battery cell will be squeezed and blocked by the electrode assembly during thermal runaway, so as to enable the high temperature and high pressure flue gas to flow smoothly and orderly to the pressure relief mechanism to achieve directional pressure relief.

[0004] To achieve the above objectives, according to a first aspect of the embodiments of this application, a battery cell is provided, including a housing, electrode terminals, a pressure relief mechanism, an electrode assembly, and an insulating member. The housing has a first sidewall and a second sidewall opposite to each other along a first direction, a third sidewall and a fourth sidewall opposite to each other along a second direction, and a fifth sidewall and a sixth sidewall opposite to each other along a third direction. The first sidewall, the third sidewall, the second sidewall, and the fourth sidewall are connected end-to-end. The fifth sidewall and the sixth sidewall are located at both ends of the first sidewall. The dimension of the housing along the third direction is larger than the dimension along the first direction, and the dimension of the housing along the first direction is... The dimension is larger than the dimension along the second direction. The electrode terminals are located on the fifth side wall and / or the sixth side wall. The pressure relief mechanism is located on the fifth side wall or the sixth side wall. The electrode assembly is located inside the housing. The electrode assembly includes a main body and a tab electrically connected to the main body. The tab is electrically connected to the electrode terminals. There are gaps between the main body and the first side wall, and between the main body and the second side wall. An insulating member covers the electrode assembly. The area of ​​the insulating member corresponding to at least one of the first side wall and the second side wall is provided with a protrusion. The protrusion abuts against the corresponding side wall. The first direction, the second direction and the third direction are perpendicular to each other.

[0005] In the battery cell of this embodiment, when thermal runaway occurs and the main body of the electrode assembly begins to expand and attempts to move towards the sidewall, the protrusion abuts against the corresponding first and / or second sidewall. The protrusion forms a physical support point or support surface between the main body and the sidewall, so that even if the main body moves towards the first and / or second sidewall, the protrusion can effectively limit the distance between the main body and the sidewall, thereby ensuring that at least one air passage remains unobstructed between the first sidewall and the main body, and / or between the second sidewall and the main body.

[0006] In some embodiments, the first direction is parallel to the direction of gravity of the battery cell when the battery cell is in operation, and the first sidewall is used to support the weight of the electrode assembly, or the second sidewall is used to support the weight of the electrode assembly. Thus, the protrusions support the electrode assembly, which naturally falls due to gravity, ensuring unobstructed airflow.

[0007] In some embodiments, the region of the insulating member corresponding to the first sidewall has a plurality of protrusions spaced apart along a third direction; and / or, the region of the insulating member corresponding to the second sidewall has a plurality of protrusions spaced apart along a third direction. This provides more uniform and stable support for the electrode assembly, reducing the possibility of local sagging or deformation of the electrode assembly due to gravity or uneven internal stress, thereby reducing the possibility of blockage of the gas guide path.

[0008] In some embodiments, the length extension direction of the protrusion is parallel to the second direction, and the size of the protrusion along the second direction is smaller than the size of the main body along the second direction.

[0009] In some embodiments, the length extension direction of the protrusion is parallel to the second direction, and the protrusion is provided with at least one flow channel, which connects the two sides of the protrusion along a third direction. By providing a flow channel on the protrusion, the guiding effect of high-temperature and high-pressure flue gas inside the battery cell is optimized, effectively reducing the possibility of high-temperature and high-pressure flue gas being blocked at the protrusion.

[0010] In some embodiments, the dimension of the protrusion along the second direction is a, and the dimension of the main body along the second direction is A, where 90%*A≤a≤A.

[0011] In some embodiments, along a third direction, the distance between two adjacent protrusions is b, and the size of the main body is B, where 70%*B≥b≥20%*B. This not only maintains the stability of the gas guiding path but also provides a structural basis for setting a greater number of flow channels on the protrusions, further improving the discharge efficiency of high-temperature and high-pressure flue gas.

[0012] In some embodiments, the length extension direction of the protrusion is parallel to a third direction, the size of the protrusion along the third direction is less than or equal to the size of the body portion along the third direction, and the size of the protrusion along the second direction is less than the size of the body portion along the second direction.

[0013] In some embodiments, the region of the insulating member corresponding to the first sidewall is provided with a plurality of protrusions spaced apart along a second direction; and / or, the region of the insulating member corresponding to the second sidewall is provided with a plurality of protrusions spaced apart along a second direction.

[0014] In some embodiments, along the first direction, the distance between the first sidewall and the second sidewall is L, and the height of the protrusion is h, where 3%*L / 2 ≤ h ≤ 5%*L / 2. Thus, the protrusion provides effective support while maintaining sufficient airflow space and electrical isolation distance.

[0015] In some embodiments, the insulating element and the protrusion are integrally formed; or, the protrusion is a component made of insulating material that is independent of the insulating element and is bonded to the insulating element.

[0016] In some embodiments, the insulating element comprises a polyethylene terephthalate (PET) material or a polyphenylene sulfide (PPS) material, and / or the protrusion comprises a PET material or a PPS material.

[0017] According to a second aspect of an embodiment of this application, a battery device is provided. The battery device includes a battery cell as described above, the battery cell being used to store or provide electrical energy.

[0018] In some embodiments, the battery device includes a housing body, in which individual battery cells are housed; the bottom wall of the housing body abuts against a first side wall or a second side wall of the individual battery cells.

[0019] In some embodiments, electrode terminals are disposed on one of the fifth sidewall and the sixth sidewall, and pressure relief mechanism is disposed on the other of the fifth sidewall and the sixth sidewall; the battery device includes at least two battery cells arranged along a third direction, and the pressure relief mechanisms of adjacent battery cells are disposed opposite to each other or back to back.

[0020] According to a third aspect of the embodiments of this application, an energy storage device is provided. Wherein: The energy storage device includes battery cells as described above, which are used to store or provide electrical energy; Alternatively, the energy storage device may include a battery device as described above, which is used to store or provide electrical energy.

[0021] According to a fourth aspect of an embodiment of this application, an energy storage system is provided. The energy storage system includes: Energy conversion system; and As mentioned above, in an energy storage device, an energy conversion system is electrically connected to the energy storage device to convert the current input to the energy storage device or output from the energy storage device into energy.

[0022] According to a fifth aspect of an embodiment of this application, a charging network is provided. The charging network includes charging piles; and, The charging network also includes energy storage devices as described above, and the charging piles are electrically connected to the energy storage devices. Alternatively, the charging network may also include an energy storage system as described above, with the charging piles electrically connected to the energy storage system; Among them, the energy storage device is used to provide power to the charging pile. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application; Figure 2 for Figure 1 A schematic diagram of the exploded battery cell is shown. Figure 3 for Figure 1 A top view of a single battery cell is shown. Figure 4 for Figure 3 Cross-sectional view along the AA direction; Figure 5 This is a schematic diagram of the structure of a battery cell according to an embodiment of this application. Figure 1 ; Figure 6 for Figure 5 The schematic diagram of the battery cell shown Figure 2 ; Figure 7 for Figure 5 A schematic diagram of the exploded battery cell is shown. Figure 8 for Figure 5 A top view of a single battery cell is shown. Figure 9 for Figure 8 Cross-sectional view along the middle BB direction; Figure 10 This is a schematic diagram of the structure of an electrode assembly covering an insulating component for a battery cell according to an embodiment of this application; Figure 11 This is a schematic diagram of the structure of another electrode assembly covering an insulating component for a battery cell according to an embodiment of this application; Figure 12 for Figure 11 Enlarged view of point C in the middle; Figure 13 This is a schematic diagram of the structure of an electrode assembly covering an insulating component for a battery cell according to an embodiment of this application; Figure 14 This is a schematic diagram of the structure of another electrode assembly covering an insulating component for a battery cell according to an embodiment of this application; Figure 15 This is a schematic diagram of the structure of a battery device according to an embodiment of this application; Figure 16 This is a schematic diagram of the structure of an energy storage device according to an embodiment of this application.

[0025] The figures in the diagram are labeled as follows: 100. Battery cell; 10. Shell; 11. First sidewall; 12. Second sidewall; 13. Third sidewall; 14. Fourth sidewall; 15. Fifth sidewall; 16. Sixth sidewall; 20. Electrode assembly; 21. Main body; 22. Electrode tab; 30. Insulating component; 31. Protrusion; 311. Flow channel; 41. Electrode terminals; 42. Pressure relief mechanism; 200. Battery assembly; 201. Box body; 202. Box cover; 203. Assembly space; 300. Energy storage device; 301. Cabinet; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0026] 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.

[0027] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0028] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction 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.

[0030] Currently, judging from market trends, the application of new energy batteries is becoming increasingly widespread. New energy batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants (battery devices used in these applications are generally referred to as energy storage batteries), but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars (battery devices used in these applications are generally referred to as power batteries).

[0031] In a single battery cell, the gaps between the electrode assembly and the two long sidewalls of the casing form a gas-guiding path, allowing the high-temperature, high-pressure flue gas generated during thermal runaway to flow to the pressure relief mechanism. When thermal runaway occurs, the electrode assembly shifts relative to the casing under internal high pressure, subsequently compressing the long sidewalls and causing blockage of the gas-guiding path. This leads to localized accumulation of high-temperature, high-pressure flue gas and the formation of molten metal beads, which can easily cause non-directional rupture of the casing, thus affecting the reliability of the directional pressure relief function.

[0032] Specifically, during the operation of a battery cell with a similar profile to a blade battery, when an internal thermal runaway event occurs, the electrode assembly moves towards the first or second sidewall under the influence of high-temperature, high-pressure flue gas. This directly contacts and compresses the casing sidewall, reducing or eliminating the space for the gas guide path. At this point, the high-temperature, high-pressure flue gas cannot flow smoothly and orderly through the gas guide path to the pressure relief mechanism, but instead accumulates in a localized area, leading to increased pressure and temperature in that area. The increased temperature causes the formation of molten aluminum beads, which may melt through the casing structure or damage internal insulating components, resulting in an internal short circuit. The increased pressure can cause the casing to rupture in non-pressure relief areas, leading to the disordered ejection of thermal runaway products and increasing the risk.

[0033] Based on the above considerations, embodiments of this application provide a single battery cell, which is then used in the manufacture of battery devices, energy storage devices, energy storage systems, and charging networks. In this single battery cell, the first and second sidewalls of the casing are the two smaller long sidewalls of the casing. Gas-guiding paths are formed between the first sidewall and the electrode assembly, and between the second sidewall and the electrode assembly. When thermal runaway occurs in the battery cell, the high-temperature, high-pressure flue gas generated inside will flow directionally from the gas-guiding paths on both sides to the pressure relief mechanism, thereby achieving directional pressure relief. Considering that the electrode assembly may expand or move relative to the casing under internal pressure, the insulating part of the main body of the battery cell that covers the electrode assembly has protrusions corresponding to the areas of the first and / or second sidewalls. These protrusions can support the main body, thereby ensuring that at least one of the gas-guiding paths between the first and second sidewalls and the main body remains unobstructed, reducing the possibility of blockage and achieving directional pressure relief, thus improving the reliability of the battery cell.

[0034] To illustrate the technical solutions provided by the embodiments of this application, the following detailed description is provided in conjunction with specific drawings and embodiments.

[0035] According to a first aspect of the embodiments of this application, embodiments of this application provide a battery cell 100. For example... Figures 1 to 10 As shown, the battery cell 100 includes a housing 10, electrode terminals 41, a pressure relief mechanism 42, an electrode assembly 20, and an insulating member 30. The housing 10 has a first sidewall 11 and a second sidewall 12 opposite to each other along a first direction X, a third sidewall 13 and a fourth sidewall 14 opposite to each other along a second direction Y, and a fifth sidewall 15 and a sixth sidewall 16 opposite to each other along a third direction Z. The dimension of the housing 10 along the third direction Z is larger than the dimension along the first direction X, and the dimension of the housing 10 along the first direction X is larger than the dimension along the second direction Y. That is to say, the battery cell 100 is a square cell. The first sidewall 11 and the second sidewall 12 are the two long sidewalls of the housing 10 of the battery cell 100, the third sidewall 13 and the fourth sidewall 14 are the two long sidewalls, and the fifth sidewall 15 and the sixth sidewall 16 are the two end caps. The outer contour shape of the battery cell 100 is similar to the outer contour shape of the "blade battery". Electrode terminals 41 are disposed on the fifth sidewall 15 and / or the sixth sidewall 16, and pressure relief mechanism 42 is disposed on the fifth sidewall 15 or the sixth sidewall 16. Electrode assembly 20 is disposed within housing 10, and includes a main body 21 and a tab 22 electrically connected to the main body 21, the tab 22 being electrically connected to electrode terminals 41. Insulating member 30, i.e., Mylar insulating film, covers electrode assembly 20, and the area of ​​insulating member 30 corresponding to at least one of the first sidewall 11 and the second sidewall 12 has a protrusion 31, the protrusion 31 abutting against the corresponding sidewall. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0036] To facilitate understanding, the following explains some key technical terms: The battery cell 100 is a device for storing or providing electrical energy. Energy conversion and storage are achieved internally through electrochemical reactions. The battery cell 100 is designed with a square structure to adapt to different application scenarios and spatial layouts.

[0037] The housing 10 is the external protective structure of the battery cell 100, used to house the internal electrode assembly 20 and other components, and to provide mechanical support and environmental isolation. The housing 10 has six sidewalls, including a first sidewall 11 and a second sidewall 12 opposite each other along a first direction X, a third sidewall 13 and a fourth sidewall 14 opposite each other along a second direction Y, and a fifth sidewall 15 and a sixth sidewall 16 opposite each other along a third direction Z. The first sidewall 11 and the second sidewall 12 are the two smaller long sidewalls of the housing 10, the third sidewall 13 and the fourth sidewall 14 are the two larger long sidewalls, and the fifth sidewall 15 and the sixth sidewall 16 are the two end caps. The dimensions of the housing 10 are designed such that its dimension along the third direction Z is larger than its dimension along the first direction X, and its dimension along the first direction X is larger than its dimension along the second direction Y. Thus, the overall external shape of the battery cell 100 is similar to that of a "blade battery." The first direction X, the second direction Y, and the third direction Z are three mutually perpendicular reference directions used to define the internal structure and spatial position of the battery cell 100; that is, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other in pairs. The casing 10 can be formed from aluminum alloy material through stamping or stretching processes to provide sufficient strength and sealing. The first direction X refers to the width direction of the battery cell 100, the second direction Y is the thickness direction of the battery cell 100, and the third direction Z is the length direction of the battery cell 100.

[0038] The electrode terminal 41 is the interface for electrical connection between the battery cell 100 and the external circuit. The electrode terminal 41 is provided on one end cover of the housing 10, or both end covers are provided with electrode terminals 41. The electrode terminal 41 can be a bolt-on terminal or a plug-in terminal, and it passes through the side wall through a sealed structure to connect to the internal electrode assembly 20, so as to facilitate connection with the external circuit.

[0039] The pressure relief mechanism 42 is used to promptly release high-temperature, high-pressure flue gas inside the battery cell 100 when the internal pressure abnormally increases, such as in the event of thermal runaway, to prevent the casing 10 from rupturing. The pressure relief mechanism 42 is located on one of the end caps. The pressure relief mechanism 42 can be a pre-defined weak point, such as a scored metal sheet or a ruptureable diaphragm. When the internal pressure reaches a preset threshold, the pressure relief mechanism 42 automatically opens to release the pressure.

[0040] The electrode assembly 20 is the core functional component of the battery cell 100, responsible for carrying out the electrochemical reaction. The electrode assembly 20 is disposed inside the housing 10 and includes a main body 21 and tabs 22 electrically connected to the main body 21. The main body 21 is formed by winding or stacking a positive electrode sheet, a negative electrode sheet, and a separator (e.g., ...). Figure 2 , Figure 7 , Figures 10 to 14 The stacked electrode assembly 20 shown is the core part of the battery for electrochemical reactions. The tab 22 is the lead-out part (i.e., the current lead-out terminal) of the electrode assembly 20, which is electrically connected to the electrode terminal 41 by welding or other conductive connection methods.

[0041] The insulating element 30 is a thin film material with good insulating properties, used to cover the electrode assembly 20, providing electrical insulation protection and preventing short circuits between the electrode assembly 20 and the housing 10 or other components. The insulating element 30 can be a complete insulating film, covering the electrode assembly 20 by wrapping or wrapping.

[0042] The protrusion 31 is a structure provided in a specific area of ​​the insulating member 30. It can be a small raised structure formed on the surface of the insulating member 30 by molding or hot pressing. Its function is to form a support point or support surface between the electrode assembly 20 and the side wall of the housing 10, thereby forming or maintaining a certain gap between the electrode assembly 20 and the side wall.

[0043] When thermal runaway occurs inside the battery cell 100, the main body 21 of the electrode assembly 20, supported by the protrusion 31, ensures that at least one of the air guiding paths between the first sidewall 11 and the main body 21, and between the second sidewall 12 and the main body 21, remains unobstructed. In other words, due to the presence of the protrusion 31, even if the electrode assembly 20 expands or moves to a certain extent, a certain gap is maintained between the electrode assembly 20 and the sidewall, allowing high-temperature, high-pressure flue gas to flow through the gap to the pressure relief mechanism 42. Therefore, this supporting effect of the protrusion 31 reduces the possibility of blockage in the air guiding paths, thereby achieving directional pressure relief and improving the reliability of the battery cell 100.

[0044] The following example will illustrate this point in more detail: The battery device 200 is equipped with multiple battery cells 100. When one of the battery cells 100 experiences thermal runaway due to external impact or internal short circuit, the internal temperature of the battery cell 100 will rise rapidly, and the electrolyte will decompose to produce a large amount of high-temperature and high-pressure flue gas.

[0045] Without the protrusion 31 on the insulating member 30 used to cover the main body 21 of the electrode assembly 20, the main body 21 of the electrode assembly 20 will expand and shift under internal high pressure. Since the space reserved for the air guide path between the first sidewall 11 and the second sidewall 12 of the housing 10 and the main body 21 is relatively narrow, the expansion and shift of the main body 21 can easily cause it to directly press against the first sidewall 11 and / or the second sidewall 12. Once the main body 21 is in close contact with the sidewall, the original air guide path will be blocked, preventing the high-temperature, high-pressure flue gas from flowing smoothly to the pressure relief mechanism 42. This high-temperature, high-pressure flue gas will accumulate locally inside the battery cell 100, resulting in excessively high local pressure. This local high pressure may cause non-directional rupture of the housing 10, such as an explosion in a non-pressure relief area, thus posing a hazard to the surrounding battery cells 100.

[0046] In this embodiment, the battery cell 100 has at least one protrusion 31 on the insulating member 30 covering the main body 21 of the electrode assembly 20, corresponding to the area of ​​the first sidewall 11 and / or the second sidewall 12. When thermal runaway occurs and the main body 21 of the electrode assembly 20 begins to expand and attempts to move towards the sidewall, the protrusion 31 abuts against the corresponding first sidewall 11 and / or second sidewall 12. The protrusion 31 forms a physical support point or support surface between the main body 21 and the sidewall, effectively limiting the distance between the main body 21 and the sidewall even if the main body 21 moves towards the first sidewall 11 and / or the second sidewall 12, thus ensuring that at least one air passage remains unobstructed between the first sidewall 11 and the main body 21, and / or between the second sidewall 12 and the main body 21.

[0047] Specifically, after high-temperature, high-pressure flue gas is generated inside the battery cell 100, it flows from the spaces on both sides of the electrode assembly 20 to the pressure relief mechanism 42 along the air guide paths maintained by the protrusions 31. For example, the flue gas will flow along the air guide paths between the first sidewall 11 and the main body 21 and between the second sidewall 12 and the main body 21, eventually converging and being discharged from the pressure relief mechanism 42. Due to the supporting effect of the protrusions 31, at least one air guide path can remain unobstructed even under extreme conditions of thermal runaway, reducing the possibility of blockage of the air guide path due to the displacement of the electrode assembly 20. As a result, the pressure inside the battery cell 100 can be effectively guided to the pressure relief mechanism 42 for directional release, reducing the risk of non-directional rupture of the casing 10, thereby improving the reliability of the battery cell 100.

[0048] As can be seen, the battery cell 100 provided in the embodiments of this application can directionally depressurize, effectively improving the reliability of the battery cell 100 under extreme operating conditions, and effectively improving the reliability of the battery cell 100. It demonstrates an important technical contribution in solving the technical problem of the gas guiding path being squeezed and blocked by the electrode assembly during thermal runaway.

[0049] In some embodiments of this application, when the battery cell 100 is in operation, the first direction X is parallel to the direction of gravity of the battery cell 100. At this time, the electrode assembly 20 will naturally fall within the housing 10 under gravity, and the first sidewall 11 or the second sidewall 12 will support the electrode assembly 20. Without the support of the protrusion 31, the electrode assembly 20 would directly compress the first sidewall 11 or the second sidewall 12 of the housing 10, causing the air passage to be blocked. To address this, in the battery cell 100 provided in this application, the area of ​​the insulating member 30 corresponding to the first sidewall 11 is provided with a protrusion 31, and / or the area of ​​the insulating member 30 corresponding to the second sidewall 12 is provided with a protrusion 31. When only the area of ​​the insulating member 30 corresponding to the first sidewall 11 has a protrusion 31, the first sidewall 11 is used to support the weight of the electrode assembly 20; when only the area of ​​the insulating member 30 corresponding to the second sidewall 12 has a protrusion 31, the second sidewall 12 is used to support the weight of the electrode assembly 20. In this way, the protrusion 31 supports the electrode assembly 20, which falls naturally due to gravity, thus ensuring a smooth air passage.

[0050] When the battery cell 100 is installed and in operation in practical applications, its spatial orientation is such that its width direction (first direction X) is parallel to the direction of gravity. Under these specific installation and operating conditions, the electrode assembly 20, due to its own mass, will naturally move downwards along the first direction X under the influence of gravity. At this time, without the support of the protrusion 31, the electrode assembly 20 will contact the inner wall of the housing 10, that is, the first sidewall 11 or the second sidewall 12 of the housing 10 will directly bear and support the electrode assembly 20, which may cause blockage of the air guide path and reduce the reliability of directional pressure relief. Based on this, the insulating member 30 is provided with a protrusion 31 in the area corresponding to the first sidewall 11, and / or, the insulating member 30 is provided with a protrusion 31 in the area corresponding to the second sidewall 12, and the first sidewall 11 or the second sidewall 12 is used to support the weight of the electrode assembly 20. These protrusions 31 may only be provided in the area of ​​the insulating member 30 corresponding to the first sidewall 11, or only in the area of ​​the insulating member 30 corresponding to the second sidewall 12, or both. The protrusion 31 serves as a physical spacer to support the main body 21 of the electrode assembly 20 when the electrode assembly 20 falls due to gravity. This prevents the main body 21 from sticking tightly to the side wall of the housing 10, ensuring unobstructed airflow. In the event of thermal runaway inside the battery cell 100, high-temperature and high-pressure flue gas can be smoothly discharged through the reserved airflow path, achieving directional pressure relief and significantly improving the reliability of the battery cell 100 under various working conditions.

[0051] Through the above technical solution, this application effectively solves the problem that the gas guiding path may be blocked due to the downward fall of the electrode assembly 20 when the battery cell 100 is in a specific working state, i.e., when the first direction X is parallel to the direction of gravity. By providing protrusions 31 on the insulating member 30 in the areas corresponding to the first sidewall 11 and / or the second sidewall 12, and by having the first sidewall 11 or the second sidewall 12 support the weight of the electrode assembly 20, these protrusions 31 can reliably support the electrode assembly 20 that falls naturally due to gravity, ensuring that the gas guiding path between the main body 21 of the electrode assembly 20 and the sidewall of the housing 10 remains unobstructed. This greatly improves the reliability of the battery cell 100 in achieving directional pressure relief during thermal runaway events, reduces the risk of pressure relief failure due to gravity, and thus significantly improves the overall performance and reliability of the battery cell 100.

[0052] In some embodiments of this application, such as Figure 2 , Figure 4 , Figure 7 , Figure 9 and Figure 10 As shown, the area of ​​the insulating member 30 corresponding to the first sidewall 11 is provided with a plurality of protrusions 31 spaced apart along the third direction Z; and / or, the area of ​​the insulating member 30 corresponding to the second sidewall 12 is provided with a plurality of protrusions 31 spaced apart along the third direction Z. "A plurality of protrusions 31" refers to a protrusion structure with a number greater than one provided on the insulating member 30 along the length direction (i.e., the third direction Z) of the battery cell 100. Furthermore, these protrusions 31 are not tightly connected as a whole, but rather there is a certain spatial interval between any two adjacent protrusions. The purpose of this spaced arrangement is to allow high-temperature, high-pressure flue gas to flow between the protrusions 31 while providing support, and to achieve uniform support, effectively solving the problem of uneven support that may occur in the electrode assembly 20 under gravity.

[0053] In one implementation, these protrusions 31 can be a series of independent, regularly shaped protrusions, such as cylindrical, square, or elliptical bosses, which are arranged at intervals along the third direction Z on the insulating member 30. In another implementation, the protrusions 31 can also be strip-shaped structures extending along the second direction Y, with adjacent strip-shaped structures spaced apart along the third direction Z, and a predetermined gap left between the end of each strip-shaped structure along the second direction Y and the housing 10 to form multiple independent support points and flow channels.

[0054] When the battery cell 100 is in operation and the first direction X is parallel to the direction of gravity, the electrode assembly 20 tends to fall due to its own weight. At this time, the multiple protrusions 31 arranged at intervals along the third direction Z can jointly and evenly support the electrode assembly 20, so that the gravitational load of the electrode assembly 20 is distributed to multiple support points, thereby reducing excessive sag or deformation in local areas of the electrode assembly 20. Since there are intervals between adjacent protrusions 31, these intervals form multiple interconnected air guiding channels, so that the air guiding path between the electrode assembly 20 and the side wall 11 or 12 remains unobstructed along the entire third direction Z. This not only enhances the stability of the electrode assembly 20 within the housing 10, but also, in the event of thermal runaway inside the battery cell 100, can more reliably guide the high-temperature and high-pressure flue gas to the pressure relief mechanism 42, thereby achieving efficient and directional pressure release.

[0055] As an example, the area of ​​the insulating member 30 corresponding to the first sidewall 11 may be provided with a plurality of rectangular protrusions 31 arranged at equal intervals along the third direction Z. These rectangular protrusions 31 may be manufactured integrally with the insulating member 30, for example by hot pressing or molding. A predetermined spacing is left between adjacent rectangular protrusions 31 to provide sufficient support over the entire length, and the spacing is sufficient to form an effective flow channel. When the battery cell 100 is installed in the electrical equipment and is in operation, the first direction X of the battery cell 100 is parallel to the direction of gravity, and the electrode assembly 20 sinks under the action of gravity, with the sidewall of the housing 10 abutting against these rectangular protrusions 31. The uniform distribution of these protrusions 31 prevents the electrode assembly 20 from being over-stressed at any point and deforming, while the gaps between the protrusions 31 allow high-temperature and high-pressure flue gas to pass smoothly along the third direction Z and be guided to the pressure relief mechanism 42 in the event of thermal runaway.

[0056] Through the above technical solution, multiple protrusions 31 arranged at intervals along the third direction Z on the insulating component 30 can provide more uniform and stable support for the electrode assembly 20. This multi-point distributed support effectively reduces the possibility of local sagging or deformation of the electrode assembly 20 due to gravity or uneven internal stress, thereby reducing the possibility of blockage of the gas guiding path, ensuring unobstructed gas guiding path in the third direction Z, improving the reliability and efficiency of directional pressure relief of the battery cell 100 during thermal runaway, and enhancing the reliability of the battery cell 100 in use.

[0057] In some embodiments of this application, the length extension direction of the protrusion 31 is parallel to the second direction Y, such as... Figures 10 to 12As shown, the dimension of the protrusion 31 along the second direction Y is smaller than the dimension of the main body 21 along the second direction Y. Therefore, even if the protrusion 31 is a solid structure, the airflow path can remain unobstructed. The dimension of the main body 21 along the second direction Y is its thickness. The length extension direction of the protrusion 31 is parallel to the second direction Y, meaning that the length direction of the protrusion 31 is consistent with the thickness direction of the battery cell 100. Thus, when the protrusion 31 supports the main body 21, it does not completely cover the entire thickness of the main body 21, but leaves a predetermined gap in the thickness direction of the main body 21. Therefore, even if the protrusion 31 is a solid structure, the airflow path can remain unobstructed (a solid structure means that the protrusion 31 does not have predetermined flow channels or holes inside).

[0058] In this embodiment, by designing the length extension direction of the protrusion 31 to be parallel to the second direction Y, and limiting the size of the protrusion 31 along the second direction Y to be smaller than the size of the main body 21 along the second direction Y, the space occupied by the protrusion 31 in the thickness direction (second direction Y) of the battery cell 100 is effectively controlled when the protrusion 31 supports the electrode assembly 20. When thermal runaway occurs inside the battery cell 100, the electrode assembly 20 is supported by the protrusion 31, and since the size of the protrusion 31 along the second direction Y is smaller than the thickness of the main body 21, a sufficient gap can be formed between the main body 21 and the side wall of the housing 10 to form an effective flow channel. The high-temperature and high-pressure flue gas still has enough space to bypass the protrusion 31 and then flow to the pressure relief mechanism 42. Thus, even when the protrusion 31 is solid, the gas guiding path can remain unobstructed, thereby effectively guiding the high-temperature and high-pressure flue gas generated by thermal runaway to the pressure relief mechanism 42, realizing directional pressure relief, and improving the reliability of the battery cell 100.

[0059] As an example, the multiple protrusions 31 can be designed as elongated strips or ribs, with the long axis of the protrusions 31 parallel to the thickness direction (second direction Y) of the battery cell 100. These elongated protrusions 31 are spaced apart along the length direction (third direction Z) of the battery cell 100, forming a series of parallel support structures. When the electrode assembly 20 falls due to gravity, the main body 21 is supported by these protrusions 31. Since the length of the protrusions 31 in the thickness direction is less than the thickness of the main body 21, and the length extension direction of the protrusions 31 is parallel to the thickness direction of the main body 21, sufficient air channels penetrating the length direction of the battery cell 100 can still be formed between the two ends of the protrusions 31 and the sidewalls of the housing 10, as well as between two adjacent protrusions 31. When thermal runaway occurs in the battery cell 100, these air channels can serve as an effective path for high-pressure flue gas to flow smoothly to the pressure relief mechanism 42, thereby enabling the high-pressure flue gas to be discharged quickly and smoothly, reducing the possibility of excessive internal pressure caused by blockage of high-temperature and high-pressure flue gas, and further improving the directional pressure relief efficiency and reliability of the battery cell 100.

[0060] In some embodiments of this application, such as Figure 11 and Figure 12 As shown, this application proposes a scheme of providing a flow channel 311 on the protrusion 31. Specifically, the length extension direction of the protrusion 31 is parallel to the second direction Y, and the protrusion 31 is provided with at least one flow channel 311. In this embodiment, the number of flow channels 311 on a single protrusion 31 is preferably 1-10, and the cross-sectional flow area of ​​a single flow channel 311 is 10-200 mm², which is beneficial to increasing the flow cross-sectional area and improving the exhaust efficiency of high-temperature and high-pressure flue gas. The flow channel 311 connects the two sides of the protrusion 31 along the third direction Z, thereby forming a through flow channel at the protrusion 31, and further ensuring that the gas guiding path remains unobstructed through the flow channel 311.

[0061] The flow channel 311 refers to a flow path provided on the protrusion 31 for the flow of high-temperature and high-pressure flue gas. While providing support, the protrusion 31 actively guides the flow of high-temperature and high-pressure flue gas towards the pressure relief mechanism 42, reducing obstruction to the flow path. The flow channel 311 can be implemented by creating holes, slots, or using a porous structure on the protrusion 31. Alternatively, the protrusion 31 itself can be designed as hollow or have internal channels. The number of flow channels 311 on a single protrusion 31 can be set according to the actual needs of adjusting the flow capacity of high-temperature and high-pressure flue gas. The flow channel 311 can be designed as a circular hole or a rectangular slot. For example, the flow channel 311 can be designed as a hole or slot that penetrates the protrusion 31.

[0062] By setting the flow channel 311 in the protrusion 31, the flow guiding effect of high temperature and high pressure flue gas inside the battery cell 100 is optimized. Even if the protrusion 31 abuts against the side wall, it can provide an additional low resistance flow path for the high temperature and high pressure flue gas, effectively reducing the possibility of the high temperature and high pressure flue gas being blocked at the protrusion 31, so that the high temperature and high pressure flue gas can be smoothly guided to the pressure relief mechanism 42.

[0063] When the battery cell 100 is in operation, the first direction X is parallel to the direction of gravity of the battery cell 100. Under the influence of gravity, the electrode assembly 20 will naturally fall. At this time, the protrusion 31 on the area corresponding to the insulating member 30 and the first sidewall 11 or the second sidewall 12 will support the electrode assembly 20, thereby forming a gas guiding path between the electrode assembly 20 and the sidewall of the housing 10. Based on this, the present application designs the length extension direction of the protrusion 31 to be parallel to the second direction Y, and provides at least one flow channel 311 on the protrusion 31. These flow channels 311 are designed to connect the two sides of the protrusion 31 along the third direction Z, forming a flow channel through the protrusion 31. When thermal runaway occurs inside the battery cell 100, generating high-temperature and high-pressure flue gas, even if the protrusion 31 is in close contact with the corresponding sidewall, the flow channel 311 can still provide an additional, low-resistance flow path. High-temperature, high-pressure flue gas can flow smoothly from one side of the protrusion 31 to the other along the third direction Z through these flow channels 311, thus bypassing the solid part of the protrusion 31 and continuing to flow along the gas guiding path towards the pressure relief mechanism 42. In this way, the flow channels 311 effectively increase the cross-sectional area of ​​the flow and reduce the flow resistance, so that the gas guiding path is not completely blocked at the protrusion 31, thereby improving the efficiency of high-temperature, high-pressure flue gas discharge and the reliability of directional pressure relief in the event of thermal runaway. The number of flow channels 311 on a single protrusion 31 is preferably 1-10, and the cross-sectional flow area of ​​a single flow channel 311 is preferably 10-200 mm². These parameters are set to balance the structural strength of the protrusion 31 with the flow efficiency of high-temperature, high-pressure flue gas, provide sufficient support, and improve the guiding capacity.

[0064] As an example, the protrusions 31 provided on the insulating member 30 within the battery cell 100 can be designed as strip-shaped structures extending along the second direction Y. Multiple through holes 311 can be spaced apart along the length direction (i.e., the second direction Y) of the strip-shaped protrusions 31 as flow channels 311. For example, three circular flow channels 311 spaced apart along the second direction Y can be provided on a single protrusion 31. These circular flow channels 311 penetrate the entire width of the protrusion 31 along the third direction Z, i.e., the two ends of the circular flow channels 311 open onto opposite surfaces of the protrusion 31 along the third direction Z. When the electrode assembly 20 falls under gravity and is supported by the protrusions 31, the protrusions 31 abut against the first sidewall 11 or the second sidewall 12. At this time, the high-temperature, high-pressure flue gas generated by thermal runaway can not only flow along the gap between the electrode assembly 20 and the sidewall, but also pass through these circular flow channels 311 inside the protrusion 31, passing from one side of the protrusion 31 to the other side, and continue flowing towards the pressure relief mechanism 42.

[0065] Through the above technical solution, when thermal runaway occurs inside the battery cell 100, even if the electrode assembly 20 abuts against the side wall of the housing 10 under the support of the protrusion 31, the flow channel 311 provided on the protrusion 31 can still provide an additional, unobstructed flow path for the high-temperature and high-pressure flue gas. This significantly reduces the possibility that the gas guiding path will be completely blocked at the protrusion 31, effectively reducing the possibility that the accumulation of high-temperature and high-pressure flue gas in a local area will lead to excessive pressure. As a result, the high-temperature and high-pressure flue gas generated during thermal runaway can be guided to the pressure relief mechanism 42 more quickly and efficiently, improving the reliability and efficiency of directional pressure relief.

[0066] In some embodiments of this application, such as Figure 10 As shown, the dimension of the protrusion 31 along the second direction Y is a, and the dimension of the main body 21 along the second direction Y is A, where A is the thickness dimension of the main body 21, and satisfies 90%*A≤a≤A.

[0067] in: The dimension 'a' of the protrusion 31 along the second direction Y refers to the length of the protrusion 31 in the direction perpendicular to the length and width plane of the battery cell 100. The dimension 'a' of the protrusion 31 is related to its resistance to deformation when subjected to the force of the electrode assembly 20.

[0068] The dimension A of the main body 21 along the second direction Y refers to the thickness of the main body of the electrode assembly 20 in the direction perpendicular to the length and width plane of the battery cell 100.

[0069] By limiting the size 'a' of the protrusion 31 to between 90% and 100% of the size 'A' of the main body 21 (i.e., 90%*A≤a≤A), the protrusion 31 possesses sufficient structural strength to effectively support the electrode assembly 20 and resist any expansion or displacement that may occur during thermal runaway, thereby stably maintaining the gas guiding path. When high-temperature, high-pressure flue gas is generated inside the battery cell 100 due to thermal runaway, the electrode assembly 20 may expand. At this time, the protrusion 31 can effectively resist the deformation of the electrode assembly 20, thereby continuously and stably supporting the electrode assembly 20. This stable support provided by the protrusion 31 to the electrode assembly 20 ensures that the gas guiding path between the electrode assembly 20 and the first sidewall 11 or the second sidewall 12 remains unobstructed, allowing the high-temperature, high-pressure flue gas to flow orderly and directionally to the pressure relief mechanism 42, thereby achieving efficient and reliable directional pressure relief.

[0070] By limiting the dimension a of the protrusion 31 along the second direction Y to between 90% and 100% of the dimension A of the main body 21 along the second direction Y, the structural strength of the protrusion 31 is enhanced. This allows the protrusion 31 to reliably withstand high temperature and high pressure and the expansion force of the electrode assembly 20 when thermal runaway occurs inside the battery cell 100, reducing the possibility of deformation due to insufficient strength of the protrusion 31, thereby ensuring that the air guiding path between the electrode assembly 20 and the side wall of the housing 10 remains unobstructed. This not only maintains the stability of the air guiding path but also provides a structural basis for setting a greater number of flow channels 311 on the protrusion 31, further improving the discharge efficiency of high temperature and high pressure flue gas. The high temperature and high pressure flue gas can flow to the pressure relief mechanism 42 in an orderly and directional manner, achieving efficient and reliable directional pressure relief and improving the reliability of the battery cell 100 under extreme operating conditions.

[0071] In some embodiments of this application, such as Figure 10 As shown, along the third direction Z, the distance between two adjacent protrusions 31 is b, and the size of the main body 21 is B. Size B is the length of the main body 21, and 70%*B≥b≥20%*B. This range is set to enable the protrusions 31 to provide stable and uniform support for the electrode assembly 20, so that the protrusions 31 can provide stable and uniform multi-point support for the electrode assembly 20.

[0072] Wherein: the spacing b refers to the distance between two adjacent protrusions 31 in the third direction Z. The dimension B of the main body 21 refers to the length of the main body of the electrode assembly 20 along the third direction Z.

[0073] Specifically, when the spacing b is set between 20% and 70% of the length dimension B of the main body 21, the protrusions 31 can be fully distributed on the sides of the electrode assembly 20, providing sufficient support points. This effectively limits the overall or partial displacement of the electrode assembly 20, allowing it to remain in a relatively stable position within the housing 10. Furthermore, this spacing range design ensures sufficient space between the protrusions 31, preventing excessive occupation of the gas guide path and allowing for smooth flow of high-temperature, high-pressure flue gas during thermal runaway, thus improving the reliability of directional pressure relief.

[0074] In some embodiments of this application, in the battery cell 100, the length extension direction of the protrusion 31 is parallel to the third direction Z, such as... Figure 13 and Figure 14As shown, the dimension of the protrusion 31 along the third direction Z is less than or equal to the dimension of the electrode assembly 20 along the third direction Z, and the dimension of the protrusion 31 along the second direction Y is less than the dimension of the main body 21 along the second direction Y. Specifically, the length extension direction of the protrusion 31 is parallel to the third direction Z, meaning that the length direction of the protrusion 31 is consistent with the length direction (third direction Z) of the battery cell 100, so that the protrusion 31 can provide continuous support along the longer side of the electrode assembly 20, thereby bearing the weight of the electrode assembly 20 more evenly and effectively when the electrode assembly 20 falls due to gravity. For example, the protrusion 31 can be designed as a strip structure extending along the third direction Z (e.g., Figure 13 (as shown), or it can be composed of multiple independent supporting ribs arranged along the third direction Z and extending along the third direction Z (as shown). Figure 14 (As shown). The dimension of the protrusion 31 along the third direction Z is less than or equal to the dimension of the electrode assembly 20 along the third direction Z. That is, the length of the protrusion 31 in the third direction Z cannot exceed the length of the electrode assembly 20 in the third direction Z. In this way, the protrusion 31 can be completely located within the support range of the electrode assembly 20, reducing the possibility that the protrusion 31 may exceed the edge of the electrode assembly 20, resulting in unstable support or interference with the housing 10.

[0075] The solution of this application sets the length extension direction of the protrusion 31 on the insulating member 30 to be parallel to the third direction Z, and precisely defines its dimensions along the second direction Y and the third direction Z. This effectively solves the problem of blocked air passages in the electrode assembly 20 due to gravity when the battery cell 100 is in operation and the first direction X is parallel to the direction of gravity. When the first direction X is parallel to the direction of gravity, the electrode assembly 20 will fall towards the first sidewall 11 or the second sidewall 12 under the action of gravity. At this time, since the length extension direction of the protrusion 31 is parallel to the third direction Z, the protrusion 31 can provide continuous or distributed support along the length direction of the electrode assembly 20, effectively bearing the weight of the electrode assembly 20 and preventing the electrode assembly 20 from falling excessively and squeezing the sidewalls. Simultaneously, the dimension of the protrusion 31 along the third direction Z is less than or equal to the dimension of the electrode assembly 20 along the third direction Z, allowing the protrusion 31 to support the effective area of ​​the electrode assembly 20, solving the problems of insufficient support or support point misalignment. More importantly, the dimension of the protrusion 31 along the second direction Y is limited to be smaller than the dimension of the main body 21 along the second direction Y. Thus, even if the protrusion 31 is in close contact with the corresponding sidewall, sufficient clearance is still maintained between the main body 21 of the electrode assembly 20 and the sidewall. This clearance forms a gas guiding path, allowing high-temperature, high-pressure flue gas to flow smoothly along the path to the pressure relief mechanism 42 in the event of thermal runaway in the battery cell 100, thereby achieving directional pressure relief. This balances support stability and gas guiding smoothness, ensuring that the electrode assembly 20 is stably supported under gravity while reliably guaranteeing the pressure relief function during thermal runaway.

[0076] By using the above technical solution, the length extension direction of the protrusion 31 is set to be parallel to the third direction Z, and the dimensions of the protrusion 31 along the second direction Y and the third direction Z are reasonably limited. This effectively solves the problem of blockage of the air guiding path caused by the downward fall of the electrode assembly 20 due to gravity when the battery cell 100 is in a specific working posture (the first direction X is parallel to the direction of gravity). This design allows the protrusion 31 to provide stable and uniform support for the electrode assembly 20, reducing excessive displacement or deformation of the electrode assembly 20 under gravity. Furthermore, by limiting the dimension of the protrusion 31 along the second direction Y, even when the protrusion 31 abuts against the sidewall, sufficient space can be maintained between the electrode assembly 20 and the sidewall to form a smooth air guiding path. This significantly reduces the possibility of the air guiding path being completely blocked in the event of thermal runaway, thereby allowing high-temperature and high-pressure flue gas to be discharged smoothly, achieving reliable directional pressure relief, and greatly improving the reliability of the battery cell 100.

[0077] In some embodiments of this application, based on the fact that the length extension direction of the protrusion 31 is parallel to the third direction Z, such as Figure 13 and Figure 14 As shown, the area of ​​the insulating member 30 corresponding to the first sidewall 11 is provided with a plurality of protrusions 31 spaced apart along the second direction Y, and / or, the area of ​​the insulating member 30 corresponding to the second sidewall 12 is provided with a plurality of protrusions 31 spaced apart along the second direction Y. Here, "a plurality of protrusions 31 spaced apart along the second direction Y" means that more than one protrusion 31 is provided on the insulating member 30 along the second direction Y of the electrode assembly 20, and these protrusions 31 are distributed rather than continuous in the second direction Y. This provides multi-point, distributed support for the main body 21 of the electrode assembly 20, providing more uniform and comprehensive support to accommodate the dimensions of the electrode assembly 20 in the second direction Y.

[0078] As an example, the area of ​​the insulating member 30 corresponding to the first sidewall 11 can be provided with three protrusions 31 arranged at equal intervals along the second direction Y. Each protrusion 31 extends along the third direction Z, and the size of the protrusion 31 along the third direction Z is less than or equal to the size of the electrode assembly 20 along the third direction Z, while the size of the protrusion 31 along the second direction Y is less than the size of the main body 21 along the second direction Y. These protrusions 31 can be integrally molded onto the insulating member 30 using polyethylene terephthalate material. When the electrode assembly 20 falls due to gravity, these three protrusions 31 can jointly support the main body 21, thereby forming a stable air guiding channel between the main body 21 and the first sidewall 11. Similarly, the area of ​​the insulating member 30 corresponding to the second sidewall 12 can also adopt the same arrangement.

[0079] By arranging multiple protrusions 31 at intervals along the second direction Y on the insulating component 30, more uniform and comprehensive support can be provided for the electrode assembly 20. This dispersed support effectively solves the problem of local deformation or tilting of the electrode assembly 20 in the second direction Y that may be caused by single or partial support, thereby ensuring that the air guiding path between the electrode assembly 20 and the side wall of the housing 10 remains stable and unobstructed throughout its length. In the event of thermal runaway inside the battery cell 100, this arrangement of multiple protrusions 31 can more reliably maintain the integrity of the air guiding path, further reducing the risk of blockage and significantly improving the reliability of directional pressure relief and operational reliability of the battery cell 100.

[0080] In some embodiments of this application, along the first direction X, such as Figure 4 and Figure 9 As shown, the distance between the first sidewall 11 and the second sidewall 12 is L, and the distance L is the width dimension of the main body 21. Furthermore, as... Figure 10 As shown, the height of the protrusion 31 is h, and the height h satisfies 3%*L / 2≤h≤5%*L / 2. The protrusion 31 of height h supports the main body 21, effectively expanding the electrical isolation distance between the side wall of the housing 10 and the main body 21. This reduces the possibility of short circuits caused by the movement of the main body 21 during thermal runaway and provides a sufficiently unobstructed gas path for high-temperature, high-pressure flue gas, improving the overall efficiency and reliability of the depressurization process. Specifically, the spacing L is the width of the main body 21, and the height h relates to the gap between the electrode assembly 20 and the side wall of the housing 10, directly affecting the width of the gas path and the electrical isolation distance. The height h of the protrusion 31 satisfies 3%*L / 2≤h≤5%*L / 2. For example, when the width L of the main body 21 is 100mm, L / 2 is 50mm, then the height h of the protrusion 31 should be between 1.5mm and 2.5mm. In this way, the protrusion 31 can provide effective support and maintain sufficient gas guidance space and electrical isolation distance.

[0081] When thermal runaway occurs inside the battery cell 100, the displacement of the main body 21 of the electrode assembly 20 in the first direction X is effectively limited under the support of the protrusion 31, reducing the possibility of excessive movement or collapse of the main body 21. Simultaneously, because the height h of the protrusion 31 is precisely controlled within a specific ratio range of L / 2, a sufficiently spacious and stable gap is always maintained between the main body 21 and the first sidewall 11 and second sidewall 12 of the housing 10. This gap not only serves as a guide path for high-temperature, high-pressure flue gas, allowing it to flow smoothly to the pressure relief mechanism 42, but also significantly increases the electrical isolation distance between the main body 21 and the sidewall of the housing 10. Thus, even under extreme conditions of thermal runaway, the possibility of a short circuit between the main body 21 and the housing 10 due to movement is effectively reduced, thereby improving the reliability of the pressure relief process and the overall reliability of the battery cell 100.

[0082] In some embodiments of this application, the insulating element 30 and the protrusion 31 are integrally formed. This means that the insulating element 30 and the protrusion 31 are formed into a single, integral structure during the manufacturing process. For example, compression molding technology can be used to locally thicken or shape a specific area of ​​the insulating element 30 to directly form the structure of the protrusion 31; alternatively, a co-extrusion process can be used to composite the substrate of the insulating element 30 with the material constituting the protrusion 31 on the same production line, simultaneously forming the protrusion structure during the composite process.

[0083] Alternatively, in some other embodiments of this application, the protrusion 31 is a component made of insulating material and independent of the insulating element 30, and the protrusion 31 is bonded and fixed to the insulating element 30. That is, the protrusion 31 is a separately manufactured structural component with electrical insulation properties, and its material selection and molding process can be optimized independently of the insulating element 30. For example, the protrusion 31 can be prepared in advance using high-strength or high-heat-resistant insulating polymer materials by injection molding, extrusion molding, or 3D printing; or it can be processed from insulating ceramic materials or composite materials by cutting, grinding, etc., to meet specific mechanical strength and insulation requirements. Bonding and fixing the protrusion 31 to the insulating element 30 means that the independently prepared protrusion 31 is firmly attached to a predetermined position on the insulating element 30 by adhesive or other connection methods. For example, adhesives that are resistant to high temperatures and electrolyte corrosion and have good insulation properties, such as special epoxy resin adhesives or silicone adhesives, can be selected to precisely bond the protrusion 31 to the insulating part 30, and the bonding strength and durability can be improved by using appropriate curing processes (such as heat curing or UV curing); or, physical connection methods such as hot melt bonding or ultrasonic welding can be used to utilize the local melting or high-frequency vibration of the material to form a molecular-level bond between the protrusion 31 and the insulating part 30, thereby achieving a firm fixation.

[0084] This application provides the above two methods for manufacturing and fixing the protrusions 31 on the insulating component 30. The protrusions 31 can stably and reliably support the electrode assembly 20, thereby maintaining the unobstructed airflow path. When the insulating component 30 and the protrusions 31 are integrally formed, since they form a seamless whole during the manufacturing process, the interface weaknesses that may exist in traditional assembly, such as adhesion failure or component detachment, are solved. This integrated structure gives the protrusions 31 higher overall structural strength and stability, enabling them to better withstand high temperature, high pressure, and the impact or deformation of the electrode assembly 20 when thermal runaway occurs inside the battery cell 100, and to continuously and effectively support the electrode assembly 20. This tight combination allows the protrusions 31 to always maintain their preset position and shape, thereby stably maintaining the airflow path between the electrode assembly 20 and the first sidewall 11 or the second sidewall 12, preventing blockage due to the failure of the protrusions 31. When the protrusions 31 are bonded and fixed to the insulating component 30 as independent insulating parts, the design allows for independent optimization of the material selection for the protrusions 31. For example, insulating materials with higher mechanical strength, better heat resistance, or stronger corrosion resistance than the insulating component 30 itself can be selected. Through precise bonding and fixing processes, these independently manufactured protrusions 31 are firmly attached to the insulating component 30, forming a reliable support structure. This modular design enables the protrusions 31 to better cope with the extreme environment inside the battery cell 100, such as withstanding high temperatures and impacts during thermal runaway, while maintaining their insulation performance. Whether using integral molding or independent bonding, the core objective is to ensure that the protrusions 31 can stably play a supporting role under any operating conditions, preventing the electrode assembly 20 from sagging or shifting, thereby ensuring that the gas guiding path between the first sidewall 11 and the main body 21 or between the second sidewall 12 and the main body 21 remains unobstructed, providing an effective pressure relief channel for high-temperature and high-pressure flue gas. Both solutions effectively improve the reliability of the battery cell 100 under thermal runaway conditions.

[0085] As an example, the insulating element 30 and the protrusion 31 can be manufactured in a single molding process. For instance, a thermoforming technique can be used to place the pre-cut insulating element 30 between pressure plates of a mold with a protruding shape. By applying appropriate temperature and pressure, the material of the insulating element 30 undergoes plastic deformation under the action of the mold, thereby directly forming the desired protrusion 31 structure on the surface of the insulating element 30. This method allows for a continuous and seamless connection between the protrusion 31 and the insulating element 30.

[0086] As an example, the protrusion 31 can be manufactured as a separate component and then bonded to the insulating element 30. For instance, the protrusion 31 can be made from a high-strength, high-temperature resistant polyimide material using a precision injection molding process to form a series of miniature pillars or strip structures. These individual protrusion components 31 are then precisely placed in predetermined positions on the insulating element 30 using automated equipment. Next, a polyurethane-based insulating adhesive with excellent bonding strength and electrolyte resistance is used to firmly bond the protrusion 31 to the insulating element 30. After bonding, the adhesive is fully cured through appropriate baking or curing treatment to form a durable and reliable connection.

[0087] Whether the insulating component 30 and the protrusion 31 are integrally molded, or the separately manufactured protrusion 31 is bonded and fixed to the insulating component 30, the reliability and structural stability of the connection between the protrusion 31 and the insulating component 30 can be significantly improved. This enhanced connection method allows the protrusion 31 to continuously and stably play its role in supporting the electrode assembly 20 throughout the entire service life of the battery cell 100, especially when thermal runaway occurs inside the battery cell 100 and high-temperature and high-pressure flue gas is generated. Therefore, the possibility of support failure due to detachment, deformation, or insufficient strength of the protrusion 31 can be effectively reduced, thereby keeping the air guiding path between the first sidewall 11 and the main body 21 or between the second sidewall 12 and the main body 21 unobstructed, reducing the possibility of the air guiding path being blocked, and ensuring that the high-temperature and high-pressure flue gas can flow to the pressure relief mechanism 42 in an orderly and directional manner, thereby achieving efficient and reliable directional pressure relief and significantly improving the reliability of the battery cell 100 under extreme operating conditions.

[0088] In some embodiments of this application, the insulating component 30 includes polyethylene terephthalate (PET), polyphenylene sulfide (PPS), or other high-temperature resistant polymer materials, and / or the protrusion 31 includes PET, PPS, or other high-temperature resistant polymer materials. These materials all have melting points exceeding 200°C. For example, PPS can withstand short-term temperatures of 280°C-300°C, thus enabling the protrusion 31 to stably maintain its structural support function under extreme high-temperature conditions, ensuring unobstructed airflow. PET is a common polymer material with good mechanical strength, electrical insulation, and heat resistance. Its melting point is above 250°C, allowing it to maintain structural stability at certain high temperatures. PPS is a high-performance engineering plastic known for its excellent heat resistance, chemical corrosion resistance, and mechanical strength. Its melting point can reach above 280°C, and it can withstand even higher temperatures for short periods. Other high-temperature resistant polymer materials, such as polyimide (PI) or polyetheretherketone (PEEK), also possess the ability to maintain structural integrity and functionality under extreme high-temperature environments, with melting points or long-term service temperatures far exceeding 200°C. The selection of these materials ensures that the insulating component 30 and / or the protrusion 31 maintain their inherent physical and mechanical properties under extreme high-temperature conditions generated during thermal runaway within the battery cell 100, without softening, deforming, or melting, thus continuing to perform their supporting function.

[0089] This application uses polyethylene terephthalate, polyphenylene sulfide, or other high-temperature polymer materials with melting points exceeding 200°C to manufacture the insulating component 30 and / or the protrusion 31. In the event of thermal runaway within the battery cell 100, although the internal temperature rises sharply, the structural integrity of the insulating component 30 and / or the protrusion 31 is effectively maintained due to the excellent high-temperature resistance of the selected materials. The protrusion 31 continuously provides stable mechanical support, reducing the possibility of deformation of the electrode assembly 20 under high temperature and internal pressure, thereby keeping the air passages between the first sidewall 11 and the main body 21, and between the second sidewall 12 and the main body 21, unobstructed. This material selection, combined with the overall structural design of the battery cell 100, enables effective directional pressure relief even under the most severe thermal runaway conditions, greatly improving the reliability of the battery cell 100.

[0090] As an example, the insulating component 30 can be made of polyethylene terephthalate film, while the protrusion 31 can be made of polyphenylene sulfide (PPS) material and fixed to the insulating component 30 by injection molding and bonding. PPS material has a melting point above 280°C and can withstand short-term high temperatures of 280°C-300°C. In the event of thermal runaway in the battery cell 100, even if the internal temperature instantaneously reaches 250°C or higher, the PPS protrusion 31 can maintain its hardness and shape, without softening or deforming, thus continuously and effectively supporting the electrode assembly 20 and maintaining the unobstructed gas path.

[0091] Through the above technical solution, since the insulating component 30 and / or the protrusion 31 are made of polyethylene terephthalate, polyphenylene sulfide, or other high-temperature polymer materials, all of which have melting points exceeding 200°C, the protrusion 31 can still stably maintain its structural support function under extreme high-temperature conditions caused by thermal runaway inside the battery cell 100. This effectively solves the problem of the protrusion 31 softening, deforming, or melting due to insufficient material temperature resistance, which can cause blockage of the gas guiding path. As a result, high-temperature and high-pressure flue gas can flow smoothly and directionally to the pressure relief mechanism 42, achieving reliable directional pressure relief and significantly improving the reliability of the battery cell 100 under thermal runaway conditions.

[0092] According to a second aspect of the embodiments of this application, embodiments of this application also provide a battery device 200, such as... Figure 15 As shown, the battery device 200 includes a main body 201, a cover 202, and multiple battery cells 100 as described above. The cover 202 closes onto the opening of the main body 201, and the main body 201 and the cover 202 together form an assembly space 203, in which one or more battery cells 100 are integrated and encapsulated. For example, the battery device 200 can be a battery module, which connects multiple battery cells 100 in series or parallel and encapsulates them in a housing, providing a basic electrical interface; or, the battery device 200 can be a battery pack, which, in addition to the integration of battery cells 100, also includes a battery management system (BMS), a thermal management system, a high-voltage connector, a communication interface, etc., to ensure the safe and efficient operation of the battery pack. Among them, the battery cell 100 is used to store electrical energy or supply power. Specifically, during charging, the battery cell 100 converts electrical energy into chemical energy and stores it. The battery cell 100 is the basic unit for electrochemical energy conversion and storage. During discharging, the battery cell 100 converts chemical energy into electrical energy for output.

[0093] In some embodiments of the battery device 200 of this application, the battery cell 100 housed in the case body 201 abuts against the bottom wall of the case body 201 opposite to the case cover 202 along one of its side walls (i.e., the first side wall 11 or the second side wall 12) in the first direction X. That is, the bottom wall of the case body 201 is used to support the battery cell 100.

[0094] In this embodiment, the first sidewall 11 or the second sidewall 12 of the battery cell 100 is used to support the weight of the entire electrode assembly 20. In this configuration, the bottom wall of the main body 201 can be directly abutted against the first side wall 11 or the second side wall 12 of the battery cell 100; or, a structural adhesive can be applied between the bottom wall of the main body 201 and the first side wall 11 or the second side wall 12 of the battery cell 100, and the first side wall 11 or the second side wall 12 of the battery cell 100 can be bonded and fixed to the bottom wall of the main body 201 by the structural adhesive, that is, the bottom wall of the main body 201 and the side wall of the battery cell 100 are indirectly abutted against by the structural adhesive; or, a cold plate can be provided between the bottom wall of the main body 201 and the first side wall 11 or the second side wall 12 of the battery cell 100, the cold plate being used to absorb and transfer the heat generated by the battery cell 100 during charging and discharging to the bottom wall of the main body 201 to cool the battery cell 100, that is, the bottom wall of the main body 201 and the side wall of the battery cell 100 are indirectly abutted against by the cold plate.

[0095] In this context, it can be understood that the bottom wall of the box body 201 refers to the bottom wall panel of the box body 201 used to bear the weight of all the battery cells 100 when the battery device 200 is in operation or after the battery device 200 has been installed.

[0096] In some other embodiments of the battery device 200 of this application, one side wall (i.e., the third side wall 13 or the fourth side wall 14) of the battery cell 100 housed within the casing body 201 abuts against the bottom wall of the casing body 201 opposite to the casing cover 202 along its second direction Y. In this embodiment, the third side wall 13 or the fourth side wall 14 of the battery cell 100 is used to support the weight of the entire battery cell 100.

[0097] In some embodiments of this application, the electrode terminals 41 of the battery cell 100 are disposed on one of the fifth sidewall 15 and the sixth sidewall 16, and the pressure relief mechanism 42 is disposed on the other of the fifth sidewall 15 and the sixth sidewall 16. The battery device 200 includes at least two battery cells 100 arranged along the third direction Z, and adjacent battery cells 100 are spaced apart along the third direction Z. Between two adjacent battery cells 100, the pressure relief mechanism 42 on one battery cell 100 is arranged opposite to or away from the pressure relief mechanism 42 on the other battery cell 100. In this way, even if any one or more battery cells 100 experience thermal runaway, the high-temperature and high-pressure flue gas inside the battery cell 100 can be smoothly discharged. The battery device 200 of this embodiment is a large-capacity battery including multiple battery cells 100, which can provide power to electrical devices for a long time and solve the range anxiety of electrical devices. The number of battery cells 100 is selected according to the actual range requirements of the electrical devices. In this embodiment, multiple battery cells 100 may be arranged in a rectangular array within the assembly space 203.

[0098] As an example, the battery device 200 can be a battery module for an electric vehicle, which integrates multiple battery cells 100 connected in series and / or parallel to achieve the required voltage and capacity. These battery cells 100 are encapsulated in a robust module housing, which may be made of aluminum alloy or composite materials, providing structural support and external protection. The electrode terminals 41 of the battery cells 100 are connected to the external interface of the module via busbars, thereby enabling power transfer to the high-voltage system of the electric vehicle. Each battery cell 100 has at least two pressure relief mechanisms 42 as described above, allowing for timely and effective pressure relief in the event of thermal runaway. Furthermore, the battery module may also be equipped with temperature sensors and voltage acquisition units to monitor the operating status of the battery cells 100 and transmit the data to the battery management system (BMS) for precise management and protection of the battery device 200.

[0099] According to a third aspect of the embodiments of this application, embodiments of this application also provide an energy storage device 300. In some embodiments, the energy storage device 300 includes a battery device 200 as described above, that is, the energy storage device 300 uses one battery device 200 or multiple battery devices 200 connected in series, parallel, or in a mixed configuration, such that these battery devices 200 are used to store electrical energy or provide electrical energy. In other embodiments of this application, the energy storage device 300 includes a plurality of battery cells 100 as described above, that is, the energy storage device 300 uses a plurality of battery cells 100 connected in series, parallel, or in a mixed configuration, such that these battery cells 100 are used to store electrical energy or provide electrical energy.

[0100] The energy storage device 300 can be a small, portable device, such as a convenient energy storage battery used for outdoor tourism and camping, or a portable energy storage battery used by street vendors. The energy storage device 300 can also be a large, fixed, high-power industrial-grade device, such as a large energy storage power station used in a power plant. The energy storage device 300 can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. The energy storage device 300 can store electrical energy as needed and output it when appropriate. For example, the energy storage device 300 can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours. Other examples include independent power supply energy storage cabinets or energy storage containers used on construction sites or in factories, and larger, portable energy storage cabinets or energy storage containers used at large event venues.

[0101] like Figure 16 As shown, the energy storage device 300 provided in the embodiments of this application is preferably an energy storage cabinet, which includes a cabinet 301 and a plurality of battery devices 200, which are stacked and assembled in the cabinet 301.

[0102] In some embodiments, the energy storage device 300 may include modules such as a thermal management module, a main control module, a central control module, a power distribution module, and a fire protection module.

[0103] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery cell 100 or each battery device 200 via pipelines for regulating the temperature of the battery cell 100.

[0104] As an example, the main control module can serve as a battery management unit for multiple battery cells 100 or multiple battery devices 200, used to monitor and manage these cells. The main control module can monitor information such as current, voltage, power, or temperature of the multiple battery cells 100 or multiple battery devices 200. For example, it can control the charging and discharging current and voltage of the multiple battery cells 100 or multiple battery devices 200. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0105] As an example, the central control module can serve as the battery management unit of the energy storage device 300, used to monitor and manage the energy storage device 300. The central control module can monitor information such as the current, voltage, power, state of charge, or temperature of the energy storage device 300. For example, it can control the charging and discharging current and voltage of the energy storage device 300. As an example, the central control module includes modules such as an insulation monitoring module (IMM), a master battery management unit (MBMU), an Ethernet (ETH) module, and a fiber optic conversion module.

[0106] As an example, the fire protection module includes a control panel, detectors, alarm devices, etc., for detecting, alarming, or extinguishing fires in the energy storage device 300.

[0107] As an example, the power distribution module can be used to distribute power to the modules in the energy storage device 300 that require electricity.

[0108] According to a fourth aspect of the embodiments of this application, embodiments of this application also provide an energy storage system. The energy storage system includes an energy conversion system and an energy storage device 300 as described above. The energy conversion system is electrically connected to the energy storage device 300 to convert energy from current input to or output from the energy storage device 300. The battery device 200 in the energy storage device 300 is used to store electrical energy or provide electrical energy.

[0109] In some embodiments, the energy storage system may include one or more energy storage devices 300 and a power converter system (PCS). The power converter system is used to connect the power generation equipment, the power grid, or the load to the energy storage device 300. The power generation equipment generates electrical energy, the energy storage device 300 stores electrical energy, and the power converter system converts the current input to the energy storage device 300 or the current output from the energy storage device 300 into energy. The electrical energy generated by the power generation equipment can be stored in the energy storage device 300 through the power converter system, and the electrical energy stored in the energy storage device 300 can also be output to the load or the power grid through the power converter system. As an example, the power generation equipment may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. The specific type of power generation equipment is not limited in this application.

[0110] According to a fifth aspect of the embodiments of this application, embodiments of this application also provide a charging network, including charging piles.

[0111] In some embodiments, the charging network further includes an energy storage system as described above, with the charging pile electrically connected to the energy storage system, wherein the battery device 200 of the energy storage device 300 of the energy storage system is used to store electrical energy, or the battery device 200 of the energy storage device 300 is used to provide electrical energy to the charging pile.

[0112] In some other embodiments of this application, the charging network further includes an energy storage device 300 as described above, and the charging pile is electrically connected to the energy storage device 300, wherein the battery device 200 of the energy storage device 300 is used to store electrical energy, or the battery device 200 of the energy storage device 300 is used to provide electrical energy to the charging pile.

[0113] The charging pile may have one or more connectors, which are used to connect to the charging interface of the device to be charged (such as an electric vehicle), so as to replenish the energy storage unit (such as the battery of the electric vehicle) of the device to be charged.

[0114] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing has a first sidewall and a second sidewall opposite to each other along a first direction, a third sidewall and a fourth sidewall opposite to each other along a second direction, and a fifth sidewall and a sixth sidewall opposite to each other along a third direction. The first sidewall, the third sidewall, the second sidewall and the fourth sidewall are connected end to end. The fifth sidewall and the sixth sidewall are located at both ends of the first sidewall. The dimension of the housing along the third direction is greater than the dimension along the first direction, and the dimension of the housing along the first direction is greater than the dimension along the second direction. Electrode terminals are disposed on the fifth sidewall and / or the sixth sidewall; A pressure relief mechanism is provided on the fifth side wall or the sixth side wall; An electrode assembly is disposed within the housing. The electrode assembly includes a main body and an electrode tab electrically connected to the main body. The electrode tab is electrically connected to the electrode terminal. There are gaps between the main body and the first sidewall, and between the main body and the second sidewall. An insulating element covers the electrode assembly, and the insulating element has a protrusion in a region corresponding to at least one of the first sidewall and the second sidewall, the protrusion abutting against the corresponding sidewall; The first direction, the second direction, and the third direction are perpendicular to each other.

2. The battery cell according to claim 1, characterized in that, The first direction is parallel to the direction of gravity of the battery cell when the battery cell is in operation, and the first sidewall is used to support the weight of the electrode assembly, or the second sidewall is used to support the weight of the electrode assembly.

3. The battery cell according to claim 2, characterized in that, The region of the insulating member corresponding to the first sidewall is provided with a plurality of protrusions spaced apart along the third direction; and / or, the region of the insulating member corresponding to the second sidewall is provided with a plurality of protrusions spaced apart along the third direction.

4. The battery cell according to claim 3, characterized in that, The length of the protrusion extends parallel to the second direction, and the size of the protrusion along the second direction is smaller than the size of the main body along the second direction.

5. The battery cell according to claim 3, characterized in that, The length of the protrusion extends parallel to the second direction, and the protrusion is provided with at least one flow channel, which connects the two sides of the protrusion along the third direction.

6. The battery cell according to claim 5, characterized in that, The dimension of the protrusion along the second direction is a, and the dimension of the main body along the second direction is A, where 90%*A≤a≤A.

7. The battery cell according to any one of claims 3-6, characterized in that, Along the third direction, the distance between two adjacent protrusions is b, and the size of the main body is B, where 70%*B≥b≥20%*B.

8. The battery cell according to claim 2, characterized in that, The length of the protrusion extends parallel to a third direction, the size of the protrusion along the third direction is less than or equal to the size of the main body along the third direction, and the size of the protrusion along the second direction is less than the size of the main body along the second direction.

9. The battery cell according to claim 8, characterized in that, The region of the insulating member corresponding to the first sidewall is provided with a plurality of protrusions spaced apart along the second direction; and / or, the region of the insulating member corresponding to the second sidewall is provided with a plurality of protrusions spaced apart along the second direction.

10. The battery cell according to any one of claims 1-6 and 8-9, characterized in that, Along the first direction, the distance between the first sidewall and the second sidewall is L, and the height of the protrusion is h, where 3%*L / 2≤h≤5%*L / 2.

11. The battery cell according to any one of claims 1-6 and 8-9, characterized in that, The insulating component is integrally formed with the protrusion; Alternatively, the protrusion may be a separate component made of insulating material and bonded to the insulating element.

12. The battery cell according to claim 11, characterized in that, The insulating element comprises a polyethylene terephthalate material or a polyphenylene sulfide material, and / or the protrusion comprises a polyethylene terephthalate material or a polyphenylene sulfide material.

13. A battery device, characterized in that, Includes a battery cell as described in any one of claims 1-12, the battery cell being used to store or provide electrical energy.

14. The battery device according to claim 13, characterized in that, The battery device includes a housing body, and the individual battery cells are housed within the housing body; The bottom wall of the main body of the box abuts against the first side wall or the second side wall of the battery cell.

15. The battery device according to claim 13 or 14, characterized in that, The electrode terminal is disposed on one of the fifth sidewall and the sixth sidewall, and the pressure relief mechanism is disposed on the other of the fifth sidewall and the sixth sidewall; The battery device includes at least two battery cells arranged along the third direction, and the pressure relief mechanisms of two adjacent battery cells are arranged opposite to each other or back to back.

16. An energy storage device, characterized in that, The energy storage device includes a battery cell as described in any one of claims 1-12, the battery cell being used to store or provide electrical energy; Alternatively, the energy storage device may include a battery device as described in any one of claims 13-15, the battery device being used to store or provide electrical energy.

17. An energy storage system, characterized in that, include: Energy conversion system; as well as The energy storage device as claimed in claim 16, wherein the energy conversion system is electrically connected to the energy storage device to convert the current input to or output from the energy storage device into energy.

18. A charging network, characterized in that, Including charging stations; The charging network further includes the energy storage device as described in claim 16, wherein the charging pile is electrically connected to the energy storage device; Alternatively, the charging network may further include the energy storage system as described in claim 17, wherein the charging pile is electrically connected to the energy storage system; The energy storage device is used to provide electrical energy to the charging pile.

Images