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

Abstract

The application provides a battery monomer, a battery device, an energy storage device, an energy storage system, a power consumption device and a charging network. The battery monomer comprises: a shell having a containing cavity; an electrode assembly arranged in the containing cavity; and a support arranged in the containing cavity, wherein the support and the electrode assembly are distributed along a first direction, and the support is located between the electrode assembly and the shell; wherein along the first direction, the thickness dimension of the support is a, the height dimension of the shell is h, and the thickness dimension a of the support and the height dimension h of the shell satisfy: 4x10 ‑4 ≤a / h≤30x10 ‑4 The application can effectively balance the battery capacity and the heat dissipation requirement, and guarantee the cycle life of the battery.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority to patent application PCT / CN2025 / 096975, filed on May 23, 2025, entitled “Battery cell, battery device, energy storage device, system and charging network”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of batteries, and in particular to a battery cell, battery device, energy storage device, energy storage system, power consumption device, and charging network. Background Technology

[0004] Battery technology has been widely applied in energy storage and power output, with individual battery cells being extensively used in power battery systems, energy storage devices, and other power or energy storage equipment, significantly driving the rapid development of industries such as new energy vehicles and grid peak shaving. As market demand for energy density continues to increase, to meet the application requirements of long-range power batteries and large-capacity energy storage devices, individual battery cells are constantly increasing in size and capacity, and the pursuit of higher volumetric energy density has become an industry trend.

[0005] As the volumetric energy density of battery cells in related technologies continues to increase, it becomes impossible to effectively balance the capacity and heat dissipation requirements of battery cells, thus affecting the cycle life of battery cells. Utility Model Content

[0006] In view of the above problems, this application provides a battery cell, a battery device, an energy storage device, an energy storage system, an electrical device, and a charging network. The battery cell can effectively balance battery capacity and heat dissipation requirements, and ensure its cycle life.

[0007] In a first aspect, this application provides a battery cell, comprising: a casing having a receiving cavity; an electrode assembly disposed within the receiving cavity; and a support member disposed within the receiving cavity, the support member and the electrode assembly being distributed along a first direction, and the support member being located between the electrode assembly and the casing; wherein, along the first direction, the thickness dimension of the support member is 'a', and the height dimension of the casing is 'h', and the thickness dimension 'a' of the support member and the height dimension 'h' of the casing satisfy: 4 × 10⁻⁶ -4 ≤a / h≤30×10 -4 .

[0008] One embodiment of this application provides a battery cell including a casing, an electrode assembly, and a support member. By optimizing the ratio of the support member's thickness to the casing's height, the thickness dimension 'a' of the support member and the height dimension 'h' of the casing satisfy: 4 × 10⁻⁶. -4 ≤a / h≤30×10 -4At the same time, it can not only ensure the large capacity requirements of the battery cells, but also ensure the heat dissipation requirements of the battery cells by providing suitable support components, realize an effective heat dissipation mechanism, balance battery capacity and heat dissipation requirements, ensure that the battery cells can operate stably under the requirements of large capacity, ensure the cycle life of the battery cells, and reduce the performance degradation caused by high temperature.

[0009] In some embodiments, the thickness dimension 'a' of the support member and the height dimension 'h' of the outer shell satisfy the following condition: 5.5 × 10⁻⁶. -4 ≤a / h≤20×10 -4 .

[0010] One embodiment of this application provides a battery cell where the thickness dimension 'a' of the support member and the height dimension 'h' of the outer casing satisfy 5.5 × 10⁻⁶. -4 ≤a / h≤20×10 -4 While ensuring the battery capacity requirements are met, the number of cycles is increased.

[0011] In some embodiments, the capacity of a single battery cell is greater than or equal to 360Ah and less than or equal to 1500Ah, and the thickness dimension a of the support member satisfies 0.1mm≤a≤0.8mm.

[0012] The battery cell provided in one embodiment of this application, through the above-described settings, effectively adjusts the length of the heat conduction path, thereby improving the heat dissipation rate, which can reasonably improve the thermal management of large-capacity battery cells and enhance their cycle stability and reliability under high load.

[0013] In some embodiments, the support includes at least one of a thermal conductor and an insulator.

[0014] One embodiment of this application provides a battery cell that, through the above-described configuration, effectively meets the dual requirements of internal thermal management and electrical safety. The heat conductor rapidly conducts heat generated by the electrode assembly, while the insulator reduces the risk of short circuits between the electrode assembly and the casing. This design effectively dissipates heat while ensuring reliable operation of the battery cell, avoiding reliability risks caused by internal short circuits.

[0015] In some embodiments, the heat conductor includes at least one of a copper heat conductor, an aluminum heat conductor, a graphite heat conductor, a boron nitride heat conductor, and an alumina heat conductor, and the insulator includes at least one of a boron nitride insulation, an alumina insulation, a polypropylene insulation, a polyethylene insulation, a polyethylene terephthalate insulation, and a polyacetamide insulation.

[0016] The selection of these materials is based on their thermal conductivity and insulation properties. This configuration allows the heat conductor to primarily utilize highly thermally conductive materials, enabling rapid heat transfer from the battery cells to the outer casing, while the insulator provides necessary electrical isolation without compromising heat dissipation. This support structure achieves efficient heat conduction and reliable electrical isolation, thereby improving the overall performance and reliability of the battery cells.

[0017] In some embodiments, the support includes a heat conductor and an insulator. The insulator has a recess on a side facing away from the electrode assembly in a first direction. The shape of the heat conductor matches the shape of the recess. The heat conductor is disposed in the recess. Along the first direction, the insulator abuts against the electrode assembly, and the heat conductor abuts against the housing.

[0018] The above design optimizes structural thickness and heat dissipation. By using a composite structure where the heat conductor is embedded in the recessed part of the insulator, the overall thickness of the support component can be effectively reduced compared to traditional single-material supports, while maintaining the same heat dissipation performance. The heat conductor contacts the outer shell, creating an efficient heat dissipation channel that allows heat generated during battery cell operation to be quickly conducted to the outside of the shell, ensuring the battery cell's operating temperature remains within a reasonable range. Furthermore, it enhances electrical safety. The special design of surrounding the heat conductor with an insulator effectively prevents direct contact between metal debris and the heat conductor during battery cell operation, avoiding internal short circuits caused by metal debris contacting the heat conductor. This design eliminates potential safety hazards at the structural level, significantly improving the reliability of the battery cell system.

[0019] In some embodiments, one of the heat conductor and the insulator is provided with a protrusion and the other is provided with a groove, the shape of the protrusion matches the shape of the groove, and the protrusion is inserted into the groove.

[0020] One embodiment of this application provides a battery cell with an interlocking structure that strengthens the connection between the heat conductor and the insulator by providing a protrusion on one and a groove on the other, thereby improving the overall structural reliability. Furthermore, the matching design of the protrusion and groove increases the contact area, reduces thermal resistance, and prevents relative movement between the two, ensuring the structural stability of the battery cell.

[0021] In some embodiments, the insulator includes a base plate and a side plate disposed around the base plate, the base plate and the side plate forming a recess, and along a first direction, one end of the heat conductor abuts against the base plate and the other end of the heat conductor abuts against the outer casing.

[0022] The battery cell provided in one embodiment of this application, through the above-described configuration, not only ensures the mechanical strength of the support component but also guarantees the heat conduction path. In principle, the base plate and side plate together form a stable support frame, in which the heat conductor is embedded, ensuring both the support of the electrode assembly and promoting the uniform distribution of heat.

[0023] In some embodiments, the thickness of the base plate along the first direction is b, wherein 0.03 mm ≤ b ≤ 0.5 mm.

[0024] In one embodiment of this application, the thickness b of the base plate of the battery cell is within the above-mentioned size range. The reasonable base plate thickness design can ensure the support strength, meet the insulation requirements, reduce the length of the heat conduction path, improve heat dissipation, and ensure cycle life while meeting the large capacity requirements of the battery cell.

[0025] In some embodiments, the side panel includes a first sub-plate disposed opposite to each other along a second direction and a second sub-plate disposed opposite to each other along a third direction, with each end of the second sub-plate connected to one of the first sub-plates respectively, and the first direction, the second direction and the third direction intersecting each other.

[0026] One embodiment of this application provides a battery cell with a side plate comprising the aforementioned structural form, such that the overall orthographic projection of the side plate in a first direction can be quadrilateral, facilitating adaptation to the shape of the casing and the electrode assembly, ensuring support for the electrode assembly and meeting heat transfer requirements. The first sub-plate and the second sub-plate together form a recess that effectively confines the heat conductor while providing multidirectional heat conduction paths. This ensures the structural stability and heat dissipation efficiency of the battery cell, improving its cycle life.

[0027] In some embodiments, the area of ​​the first sub-plate is larger than the area of ​​the second sub-plate. Along a third direction, the heat conductor has a first end face disposed opposite to the heat conductor, and the second sub-plate has a second end face disposed away from the heat conductor. The vertical distance between the first end face and the second end face is c, where 0.02 mm ≤ c ≤ 0.2 mm.

[0028] In one embodiment of this application, the battery cell has a large-area design of the first sub-plate, which provides a wider heat conduction path. The distance c between the second sub-plate and the heat conductor is within the range of the above values, which can ensure the efficiency of heat conduction, reduce the temperature rise of the battery cell, and ensure the cycle life of the battery cell.

[0029] In some embodiments, the thickness of the second sub-plate along a third direction is e, where e ≥ 0.02 mm.

[0030] One embodiment of this application provides a battery cell where the thickness e of the second sub-plate is greater than or equal to 0.02 mm, which helps to ensure the insulation requirements of the second sub-plate. This reduces the probability of the second sub-plate being punctured by debris generated by the electrode assembly, thereby improving the reliability of the battery cell.

[0031] In some embodiments, the area of ​​the first sub-plate is larger than the area of ​​the second sub-plate. Along the second direction, the heat conductor has a third end face disposed opposite to the heat conductor, and the first sub-plate has a fourth end face disposed away from the heat conductor. The vertical distance between the third end face and the fourth end face is d, where 0.02mm≤d≤0.15mm.

[0032] In one embodiment of this application, the battery cell has a large-area design of the first sub-plate, which provides a wider heat conduction path. The distance d between the first sub-plate and the heat conductor adopts the above-mentioned numerical range, which also helps to ensure the efficiency of heat conduction, reduce the temperature rise of the battery cell, and ensure the cycle life of the battery cell.

[0033] In some embodiments, the thickness of the first sub-plate along the second direction is f, where f ≥ 0.02 mm.

[0034] One embodiment of this application provides a battery cell where the thickness f of the first sub-plate is greater than or equal to 0.02 mm, which helps to ensure the insulation requirements of the first sub-plate. This reduces the probability of the first sub-plate being punctured by debris generated by the electrode assembly, thereby improving the reliability of the battery cell.

[0035] In some embodiments, the housing includes a housing and a cover plate, the housing having an opening in a first direction, the cover plate closing the opening, the housing including a bottom wall disposed opposite to the opening, and a support member disposed between the bottom wall and the electrode assembly.

[0036] Secondly, this application provides a battery device including the aforementioned battery cell.

[0037] Thirdly, this application provides an energy storage device, including the aforementioned battery device, wherein the battery cell or battery device is used to store or provide electrical energy.

[0038] Fourthly, this application provides an energy storage system, including a power conversion device and the aforementioned energy storage device, wherein the power conversion device is used to electrically connect a power generation device and an energy storage device.

[0039] Fifthly, this application provides an electrical device, including the aforementioned battery cell, battery device, energy storage device, or energy storage system, wherein the battery cell or battery device is used to store or provide electrical energy.

[0040] Sixthly, this application provides a charging network, including a charging pile and the aforementioned energy storage device or energy storage system, wherein the energy storage device is used to provide electrical energy to the charging pile.

[0041] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application;

[0043] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application;

[0044] Figure 3 This is an exploded structural diagram of a battery cell provided in an embodiment of this application;

[0045] Figure 4 This is a cross-sectional view of a battery cell provided in an embodiment of this application;

[0046] Figure 5 This is a top view of a support member according to an embodiment of this application;

[0047] Figure 6 yes Figure 5 A cross-sectional view along the MM direction;

[0048] Figure 7 yes Figure 6 An exploded view of the structure shown;

[0049] Figure 8 yes Figure 5 A cross-sectional view along the NN direction;

[0050] Figure 9 yes Figure 8 This is an exploded diagram of the structure shown;

[0051] Figure 10 This is a cross-sectional view of a support member according to another embodiment of this application;

[0052] Figure 11 yes Figure 10 An exploded view of the structure shown;

[0053] Figure 12 This is a schematic diagram of the energy storage system.

[0054] Figure 13 This is a schematic diagram of the charging network structure.

[0055] Marker explanation:

[0056] 1. Vehicle; 100. Battery unit; 200. Battery module; 300. Controller; 400. Motor;

[0057] 10. Box body; 11. First box body section; 12. Second box body section;

[0058] 20. Battery cell;

[0059] 21. Outer shell; 211. Housing; 2111. Bottom wall; 2112. First side wall; 2113. Second side wall; 212. Cover plate; 213. Receiving cavity;

[0060] 22. Electrode assembly;

[0061] 23. Support component; 231. Insulator; 2311. Base plate; 2322. Side plate; 2322a. First sub-plate; 2322b. Second sub-plate; A1. First end face; A2. Second end face; A3. Third end face; A4. Fourth end face;

[0062] 232. Heat conductor; 233. Recess; 234. Protrusion; 235. Groove;

[0063] 24. Electrode terminals;

[0064] 30. Energy storage system; 31. Energy storage device; 32. Power conversion equipment; 33. Power generation equipment;

[0065] 40. Charging network; 41. Charging station; 42. Connector;

[0066] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0067] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0068] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0069] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this application.

[0070] Furthermore, technical terms such as "first" and "second" 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. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0071] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0072] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] Against the backdrop of the global energy structure accelerating its transformation towards cleaner and lower-carbon energy, batteries, as core components for energy storage and conversion, are playing an increasingly important role in the new energy industry. Whether it's power batteries that drive electric vehicles or energy storage batteries used to stabilize the power grid and achieve efficient utilization of distributed energy resources, higher demands are being placed on the performance of individual battery cells.

[0074] The market demand for battery cell capacity is constantly increasing, with the expectation that increasing the size and capacity of battery cells will improve overall energy storage capacity to meet the application scenarios of long-range electric vehicles and large-capacity energy storage in energy storage power stations.

[0075] However, as the size and capacity of battery cells increase, a series of technical problems have gradually emerged. Research has found that as the capacity of battery cells increases, the heat generated during charging and discharging increases significantly, and the heat dissipation design of battery cells in related technologies is insufficient to meet the growing heat dissipation demands. Insufficient heat dissipation efficiency leads to high temperature rise in battery cells, and prolonged high-temperature environments will affect the cycle life of battery cells, restricting the further application of batteries in high-performance power and energy storage fields.

[0076] Research has found that by adjusting the structure of the internal support components of a battery cell, and changing the ratio of the support component's thickness to the shell's height, the battery cell's heat dissipation capacity can be improved, thus reducing its temperature rise. A battery cell may include a shell, electrode assemblies, and support components. The shell has a receiving cavity, within which both the electrode assemblies and support components are disposed. The support components and electrode assemblies are distributed along a first direction X, with the support component located between the electrode assemblies and the shell. Along the first direction X, the thickness of the support component is 'a', and the height of the shell is 'h'. The thickness 'a' of the support component and the height 'h' of the shell satisfy: 4 × 10⁻⁶ -4 ≤a / h≤30×10 -4 The above configuration ensures both the large capacity and heat dissipation requirements of individual battery cells, effectively balancing capacity and heat dissipation needs, thus guaranteeing the cycle life of individual battery cells and providing a new solution for technological upgrades in the fields of power batteries and energy storage batteries.

[0077] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices, energy storage devices, etc. that use battery devices.

[0078] Energy storage devices include one or more battery clusters to increase the voltage and capacity of the energy storage device. A battery cluster may include multiple battery units connected in series via a busbar to increase the voltage of the energy storage device. When an energy storage device includes multiple battery clusters, the clusters are connected in parallel to increase the capacity of the energy storage device. Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, an energy storage device can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0079] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0080] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices, energy storage devices, etc., described above. For the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0081] For example, such as Figure 1 As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The interior of vehicle 1 can house a motor 400, a controller 300, and a battery device 100. The controller 300 controls the battery device 100 to supply power to the motor 400. For example, the battery device 100 can be located at the bottom, front, or rear of vehicle 1. The battery device 100 can be used to power vehicle 1; for example, it can serve as the operating power source for the vehicle 1's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for vehicle 1 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to vehicle 1.

[0082] It should be understood that the technical solutions described in the embodiments of this application are not limited to the above-mentioned vehicle 1, but can also be applied to energy storage devices.

[0083] like Figure 2As shown, to meet different power demands, the battery device 100 may include multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. The battery device 100 can also be called a battery pack. Optionally, the multiple battery cells 20 can first be connected in series, parallel, or in a mixed configuration to form a battery module 200, and then the multiple battery modules 200 can be connected in series, parallel, or in a mixed configuration to form the battery device 100. That is, the multiple battery cells 20 can directly form the battery device 100, or they can first form battery modules 200, and then the battery modules 200 can be combined to form the battery device 100.

[0084] For example, such as Figure 2 As shown, the battery device 100 may include a plurality of battery cells 20. The battery device 100 may also include a housing 10 (or cover), the housing 10 having a hollow structure inside, and the plurality of battery cells 20 are housed within the housing 10.

[0085] The housing 10 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres. This application embodiment does not limit this. The material of the housing 10 can be an alloy material such as aluminum alloy or iron alloy, or a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin. This application embodiment also does not limit this.

[0086] The housing 10 is used to accommodate the battery cell 20, and the housing 10 can have various structures. In some embodiments, the housing 10 may include a first housing portion 11 and a second housing portion 12, which overlap each other, and together define a receiving space for accommodating the battery cell 20. The second housing portion 12 may be a hollow structure with one end open, and the first housing portion 11 may be a plate-like structure, with the first housing portion 11 covering the open side of the second housing portion 12 to form a housing 10 with a receiving space; alternatively, both the first housing portion 11 and the second housing portion 12 may be hollow structures with one side open, with the open side of the first housing portion 11 covering the open side of the second housing portion 12 to form a housing 10 with a receiving space. Of course, the first housing portion 11 and the second housing portion 12 can have various shapes, such as cylinders, cuboids, etc.

[0087] To improve the sealing performance after the first housing part 11 and the second housing part 12 are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 11 and the second housing part 12.

[0088] Assuming that the first box part 11 covers the top of the second box part 12, the first box part 11 can also be called the upper box cover, and the second box part 12 can also be called the lower box 10.

[0089] In the battery device 100, there can be one or more battery cells 20. If there are multiple battery cells 20, they can be connected in series, in parallel, or in a mixed manner. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 20 can be housed in the housing 10; of course, multiple battery cells 20 can also be first connected in series, in parallel, or in a mixed manner to form a battery module 200, and then multiple battery modules 200 can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 10.

[0090] Multiple battery cells 20 in the battery module 200 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 20 in the battery module 200.

[0091] In this application, the battery cell 20 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited to this. The battery cell may be cylindrical, flat, cuboid, or other shapes, and the embodiments of this application are not limited to this either. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to this either. However, for the sake of brevity, the following embodiments will all use square battery cells 20 as an example for description.

[0092] like Figures 3 to 4 As shown, one aspect of this application provides a battery cell 20, including a housing 21, an electrode assembly 22, and a support member 23. The housing 21 has a receiving cavity 213, and the electrode assembly 22 and the support member 23 are both disposed within the receiving cavity 213. The support member 23 and the electrode assembly 22 are distributed along a first direction X, and the support member 23 is located between the electrode assembly 22 and the housing 21. Along the first direction X, the thickness of the support member 23 is 'a', and the height of the housing 21 is 'h'. The thickness 'a' of the support member 23 and the height 'h' of the housing 21 satisfy: 4 × 10⁻⁶. -4 ≤a / h≤30×10 -4 .

[0093] The outer casing 21 may include a housing 211 and a cover plate 212. The housing 211 may have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 211 may be determined according to the specific shape and size of the electrode assembly 22.

[0094] The shell 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special restrictions on this.

[0095] The cover plate 212 refers to a plate that covers the opening of the housing 211 and encloses the housing 211 to form a receiving cavity 213. The receiving cavity 213 is used to accommodate the electrode assembly 22. The cover plate 212 is a component that isolates the internal environment of the battery cell 20 from the external environment. The shape of the cover plate 212 can be adapted to the shape of the housing 211 to fit the housing 211. Electrode terminals 24 can be provided on the cover plate 212. The cover plate 212 is mechanically connected to the housing 211, and the electrode terminals 24 are electrically connected to the electrode assembly 22. Optionally, they can be electrically connected via an adapter. In the battery cell 20, the electrode terminals 24 are used to connect to a busbar component to achieve electrical connection between multiple battery cells 20. The cover plate 212 can have one or two electrode terminals 24. When there are two, the polarities of the two electrode terminals 24 can be opposite.

[0096] The cover plate 212 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the cover plate 212 is not easily deformed when subjected to compression and impact, which enables the battery cell 20 to have higher structural strength and improve safety performance. The material of the cover plate 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0097] Electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. The housing 211 may contain one or more electrode assemblies 22.

[0098] The electrode assembly 22 may include a first electrode, a second electrode, and a diaphragm with opposite polarities. The first electrode, the second electrode, and the diaphragm are wound along the winding direction to form a wound structure, or they may be stacked to form a stacked structure.

[0099] One of the first electrode and the second electrode can be a positive electrode, and the other can be a negative electrode. The structures of the first electrode and the second electrode can be the same. Of course, the second electrode can also be a conventionally configured electrode that includes a current collector and an active material layer.

[0100] The separator can be made of materials such as PP (polypropylene) or PE (polyethylene). The separator can be sandwiched between the first electrode and the second electrode to insulate them from each other.

[0101] The support member 23 is used to support the electrode assembly 22 inside the battery cell 20. The support member 23 can bear the weight of the electrode assembly 22 and reduce the deformation of the electrode assembly 22 due to vibration and impact. In addition, the support member 23 can serve as a heat dissipation path at the bottom of the electrode assembly 22, effectively transferring the heat of the electrode assembly 22 and other devices to the external heat exchange structure.

[0102] The support member 23 includes, but is not limited to, a single-layer plate-like structure or a multi-layer plate-like structure. The support member may include at least one of the following materials: boron nitride, alumina, polypropylene, polyethylene, polyethylene terephthalate, and polyacetamide.

[0103] The first direction X can be the height direction of the battery cell 20 or the casing 21.

[0104] The support member 23 may have a first surface and a second surface that are arranged opposite to each other in the first direction X. The first surface is arranged toward the electrode assembly 22 and is used to support the electrode assembly 22. The second surface may be arranged toward the bottom wall 2111 of the housing 211 and the cover plate 212 that are arranged opposite to each other. The second surface can be in contact with the outer shell 21.

[0105] In the first direction X, the thickness dimension a of the support member 23 can be understood as the vertical distance between the first surface and the second surface.

[0106] The height dimension h of the outer shell 21 can be understood as the vertical distance between two opposite end faces of the outer shell 21 in the first direction X. Optionally, it can be understood as the vertical distance between the side surface of the cover plate 212 away from the receiving cavity 213 and the side surface of the shell 211 away from the receiving cavity 213 in the first direction X.

[0107] a / h can be 4×10 -4 and 30×10 -4 Any value between 4×10 -4 and 30×10 -4 Two endpoints.

[0108] According to the heat conduction formula: Q = kA(T1-T2) / d, it can be seen that, keeping the initial heat source of the battery cell and the cooling water temperature at the bottom of the battery cell constant (i.e., T1 and T2), and considering the heat transfer area as the bottom area of ​​the battery cell, improving the heat dissipation of the battery cell means improving the thermal conductivity k of the support component 23, and reducing the thickness d of the support component 23, which corresponds to... Figure 4The value of 'a' can be used to determine the heat output and reduce the temperature of the heat source (i.e., the cell temperature). Furthermore, there are limitations to reducing the thickness of the support member 23. If the thickness of the support member 23 after compression is too low, there is a risk of internal short circuits caused by pressure on the electrode plates at the chamfered edges inside the casing of the battery cell 20. Additionally, high thermal conductivity materials are usually metals and lack insulating properties, making them prone to short-circuiting with particles at the bottom of the winding core, thus causing a short circuit in the cell.

[0109] Where: Q: Total heat transferred (unit: W or J / s); k: Thermal conductivity (W / (m•K)), characterizing the thermal conductivity of a material, such as copper with λ≈400 W / (m•K); A: Heat transfer area (m²) 2 ), cross-sectional area perpendicular to the direction of heat flow; d: material thickness (m), the longer the path, the greater the thermal resistance; T1-T2: temperature difference (K), the driving force for heat transfer.

[0110] Furthermore, the main characteristics of a large-capacity battery cell 20 are: large weight, large capacity, large total electrode area, and large total heat generation. To achieve higher energy density, the battery cell 20 can be made larger in capacity by increasing its height, or in other words, by increasing the height of the casing 21. Correspondingly, this increases heat generation, posing a significant challenge to the heat dissipation of the battery cell 20.

[0111] In the heat generation of the battery cell 20, the electrode assembly 22 serves as the heat source. The higher the battery cell 20 is, the larger its volume V and capacity C will be if the bottom area remains unchanged. Consequently, the total heat generation Q will be greater, and the heat needs to be dissipated in a timely manner.

[0112] In the battery device 100, the bottom of the battery cell 20 is mainly cooled by a heat exchange assembly. The heat dissipation path includes heat conduction from the electrode assembly 22 to the support member 23, then from the support member 23 to the outer casing 21, and finally from the outer casing 21 to the heat exchange assembly. Since the support member 23 is on the heat transfer path from the electrode assembly 22 to the heat exchange assembly, the thickness 'a' of the support member 23 is positively correlated with the thermal resistance. The higher the thickness, the lower the heat dissipation efficiency, which in turn affects the heat dissipation of the battery cell 20.

[0113] Therefore, the ratio of the thickness 'a' of the support member 23 to the height 'h' of the outer shell needs to be within 4 × 10⁻⁶. -4 ≤a / h≤30×10 -4 Within this range, it is possible to ensure that the electrode plates of the electrode assembly are not punctured or internally shorted, while also ensuring that the heat dissipation capacity matches the heat generation, preventing the temperature rise of the battery cell 20 from becoming too high and slowing down the capacity decay of the battery cell 20. Therefore, by using the above parameter range, the thickness of the support member 23 in the battery cell 20 can be reasonably designed to match the height of the outer casing 21, so as to ensure the cycle life of the battery cell.

[0114] Referring to Table 1, a battery cell 20 provided in one embodiment of this application includes a housing 21, an electrode assembly 22, and a support member 23. As shown in Table 1, by optimizing the ratio of the thickness of the support member 23 to the height of the housing 21, the thickness dimension a of the support member 23 and the height dimension h of the housing 21 satisfy: 4 × 10⁻⁶. -4 ≤a / h≤30×10 -4 At the same time, it can not only ensure the large capacity requirement of the battery cell 20, but also ensure the heat dissipation requirement of the battery cell 20 by providing a suitable support component 23, realize an effective heat dissipation mechanism, balance the battery capacity and heat dissipation requirements, ensure that the battery cell 20 can operate stably under the large capacity requirement, and ensure the cycle life of the battery cell 20. That is, within this range, the 80% SOH cycle number of the battery cell 20 is more than 1600 cls, which can effectively reduce the performance degradation caused by high temperature.

[0115] Referring to Table 1a, another embodiment of the battery cell 20 provided in this application includes a housing 21, an electrode assembly 22, and a support member 23. According to Table 1a, by optimizing the ratio of the thickness of the support member 23 to the height of the housing 21, the thickness dimension a of the support member 23 and the height dimension h of the housing 21 satisfy: 4 × 10⁻⁶. -4 ≤a / h≤30×10 -4 At the same time, it can not only ensure the large capacity requirement of the battery cell 20, but also ensure the heat dissipation requirement of the battery cell 20 by providing a suitable support component 23, realize an effective heat dissipation mechanism, balance the battery capacity and heat dissipation requirements, ensure that the battery cell 20 can operate stably under the large capacity requirement, and ensure the cycle life of the battery cell 20. That is, within this range, the 80% SOH cycle number of the battery cell 20 is all above 4750cls, which can also effectively reduce the performance degradation caused by high temperature.

[0116] In Tables 1 and 1a, SOH represents the percentage of the current capacity of a single battery cell 20 relative to its initial capacity. When SOH is 80%, it indicates that the battery capacity has decreased to 80% of its initial value. The cycle number can be understood as the process of charging a battery from 0% capacity (or a specific lower limit) to a specific upper limit, and then discharging it. For example, charging a battery from 0% capacity to 100% capacity and then discharging it back to 0% capacity constitutes one complete cycle.

[0117] The significance of 80% SOH cycle count lies in the fact that it reflects the number of cycles that a single battery cell 20 can withstand before significant capacity degradation. It helps to assess the economics and replacement cycle of the single battery cell 20 in the energy storage system 30 (such as grid energy storage which requires a high number of cycles).

[0118] The method for testing the room temperature cycle performance of a single battery cell is as follows: At 25 ℃, battery cell 20 is first charged at a constant current of 0.5 C (i.e., the current value required to completely discharge the theoretical capacity in 2 hours) to a voltage of 3.65 V, then charged at a constant voltage of 3.65 V to a current of 0.05 C. After resting for 5 minutes, battery cell 20 is discharged at a constant current of 0.5 C to a voltage of 2.5 V. This constitutes one charge-discharge cycle, and the discharge capacity of this cycle is the discharge capacity of the first cycle. Battery cell 20 is subjected to multiple charge-discharge cycles using the above method until the discharge capacity of battery cell 20 decays to 80%. The number of cycles for battery cell 20 is recorded as the 80% SOH cycle number.

[0119] Of course, the method for testing the room temperature cycle performance of a single battery cell can also be as follows: At 25 ℃, charge the battery cell 20 at a constant power of 0.5 P to a voltage of 3.65 V, let it stand for 30 min, and then discharge the battery cell 20 at a constant power of 0.5 P to a voltage of 2.5 V. This constitutes one charge-discharge cycle, and the discharge capacity of this cycle is the discharge capacity of the first cycle. Perform multiple charge-discharge cycles on the battery cell 20 using the above method until the discharge capacity of the battery cell 20 decays to 80%, and record the number of cycles of the battery cell 20 as the 80% SOH cycle number.

[0120] Table 1

[0121]

[0122] Table 1a

[0123]

[0124] In some embodiments, the thickness dimension a of the support member 23 and the height dimension h of the outer shell 21 satisfy: 5.5 × 10⁻⁶. -4 ≤a / h≤20×10 -4 In some optional embodiments, the values ​​of the thickness dimension 'a' of the support member 23 and the height dimension 'h' of the outer shell 21 may include 18.6 × 10⁻⁶. -4 .

[0125] Referring to Table 2, in one embodiment of this application, the battery cell 20 is provided. According to Table 2, when the thickness a of the support member 23 and the height h of the outer casing 21 satisfy 5.5 × 10⁻⁶... -4 ≤a / h≤20×10 -4 While ensuring battery capacity requirements, the 80% SOH cycle count is increased to over 1640, meaning that the cycle life is more advantageous.

[0126] Table 2

[0127]

[0128] Referring to Table 2a, another embodiment of the battery cell 20 provided in this application shows that when the thickness dimension a of the support member 23 and the height dimension h of the outer casing 21 satisfy 5.5 × 10⁻⁶, -4 ≤a / h≤20×10 -4 While ensuring battery capacity requirements, the 80% SOH cycle count is increased to over 4815cls, meaning it has an advantage in cycle life.

[0129] Table 2a

[0130]

[0131] In some embodiments, the capacity of the battery cell 20 is greater than or equal to 360Ah and less than or equal to 1500Ah, and the thickness a of the support member 23 satisfies 0.1mm≤a≤0.8mm.

[0132] Optionally, the capacity of the battery cell 20 may include 360Ah, 401Ah, 500Ah, 530Ah, 565Ah, 587Ah, 900Ah, 1100Ah, 1200Ah, 1500Ah, etc. The thickness dimension 'a' of the support member 23 includes any value between 0.1mm and 0.8mm, including both extreme values ​​of 0.1mm and 0.8mm. In some optional embodiments, the thickness dimension 'a' of the support member 23 satisfies 0.25mm ≤ a ≤ 0.45mm.

[0133] The battery cell 20 provided in one embodiment of this application effectively adjusts the length of the heat conduction path through the above-mentioned settings, thereby improving the heat dissipation rate and reasonably improving the thermal management of the large-capacity battery cell 20, thereby improving its cycle stability and reliability under high load.

[0134] In some optional embodiments, the height dimension h of the housing can be selected as any value between 100 mm and 300 mm, including the two extreme values ​​of 100 mm and 300 mm. In some optional embodiments, the height dimension h of the housing can be selected as any value between 150 mm and 250 mm, such as 180 mm, 200 mm, 220 mm, etc.

[0135] like Figures 5 to 9 As shown, in some embodiments, the support 23 includes at least one of a heat conductor 232 and an insulator 231.

[0136] The support member 23 may include a heat conductor 232 or an insulator 231, or it may include both a heat conductor 232 and an insulator 231. When both a heat conductor 232 and an insulator 231 are included, the heat conductor 232 and the insulator 231 may be stacked on top of each other in the first direction X. Alternatively, the heat conductor 232 may be embedded in the insulator 231 along one side of the first direction X.

[0137] When the support member 23 includes a heat conductor 232 and an insulator 231, the thickness dimension a of the support member 23 can be the maximum thickness dimension of the whole formed by the heat conductor 232 and the insulator 231 in the first direction X.

[0138] The heat conductor 232 may include a metallic or non-metallic material, such as at least one of graphite, copper, and aluminum. The insulator 231 may include a non-metallic material, optionally including at least one of boron nitride, alumina, polypropylene, and polyethylene.

[0139] The heat conductor 232 and the insulator 231 can be made of the same material, or they can be made of different materials. When the materials are the same, the heat conductor 232 and the insulator 231 can be an integral structure. Optionally, the insulator 231 is used to support the electrode assembly 22. The heat conductor 232 can be used to abut against the housing 21.

[0140] One embodiment of this application provides a battery cell 20, which, through the above-described configuration, effectively meets the dual requirements of internal thermal management and electrical safety. The heat conductor 232 rapidly conducts heat generated by the electrode assembly 22, while the insulator 231 reduces the risk of short circuits between the electrode assembly 22 and the casing 21. This effectively dissipates heat and ensures the reliable operation of the battery cell 20, avoiding reliability risks caused by internal short circuits.

[0141] In some embodiments, the heat conductor 232 comprises at least one of copper, aluminum, graphite, boron nitride, and alumina, and the insulator 231 comprises at least one of boron nitride, alumina, polypropylene, polyethylene, polyethylene terephthalate, and polyacetamide.

[0142] In some alternative embodiments, the insulator 231 may include polypropylene, and correspondingly, the heat conductor 232 may include aluminum, or it may include alumina, polypropylene, polyethylene, or copper. In some other embodiments, the insulator 231 may also include alumina, and the heat conductor 232 may include alumina, etc.

[0143] In some embodiments, the heat conductor 232 may include one of a copper heat conductor, an aluminum heat conductor, a graphite heat conductor, a boron nitride heat conductor, and an alumina heat conductor, or may include two or more. In some optional embodiments, when two or more heat conductors are included, adjacent heat conductors may be spaced apart or in contact with each other. They may be independent of each other or connected. When connected, adjacent heat conductors may be bonded, welded, or snap-fitted together. Adjacent heat conductors may also be nested and connected, such as one being partially inserted into another. Of course, adjacent heat conductors may also be indirectly connected via other adapters.

[0144] In some embodiments, the insulator 231 includes at least one of boron nitride insulation, alumina insulation, polypropylene insulation, polyethylene insulation, polyethylene terephthalate insulation, and polyacetamide insulation. In some optional embodiments, when more than one type of insulation is included, adjacent insulations can be spaced apart or in contact. They can be independent of each other or connected. When connected, adjacent insulations can be bonded or snap-fitted together. Adjacent insulations can also be nested and connected, such as one partially inserted into the other. Of course, adjacent insulations can also be indirectly connected via other adapters.

[0145] Referring to Table 3, in one embodiment of this application, the battery cell 20, through the above-described configuration, allows the heat conductor 232 to primarily utilize a high thermal conductivity material, enabling rapid conduction of heat generated by the battery cell 20 to the outer casing 21. Meanwhile, the insulator 231 provides necessary electrical isolation without affecting heat dissipation. The support member 23, employing the above-described form, achieves efficient heat conduction and reliable electrical isolation, ensuring cycle life and improving the overall performance and reliability of the battery cell 20.

[0146] Table 3

[0147]

[0148] Continue reading Figures 5 to 9 As shown, in some embodiments, the support member 23 includes a heat conductor 232 and an insulator 231. The insulator 231 has a recess 233 on the side opposite to the electrode assembly 22 in the first direction X. The heat conductor 232 is disposed in the recess 233. Along the first direction X, the insulator 231 abuts against the electrode assembly 22, and the heat conductor 232 abuts against the outer shell 21.

[0149] The recess 233 can be recessed from the end face of the insulator 231 along the first direction X from the side opposite to the electrode assembly 22 to the side where the electrode assembly 22 is located.

[0150] The orthographic projection shape of the recess 233 in the first direction X can be circular, elliptical or polygonal.

[0151] The heat conductor 232 is disposed within the recess 233, and the shape of the heat conductor 232 may be consistent with that of the recess 233, with the two being fitted together by an interference fit. Of course, in some embodiments, the shape of the heat conductor 232 may be the same as or similar to that of the recess 233, and a gap may be formed between the heat conductor 232 and the side plate 2322 of the recess 233, that is, the two may be fitted together by a clearance fit.

[0152] Optionally, the surfaces of the insulator 231 and the heat conductor 232 facing away from the electrode assembly 22 in the first direction X can be aligned.

[0153] When the support member 23 adopts the above structure, along the first direction X, the thickness dimension a of the support member 23 can be the maximum thickness dimension of the whole formed by the insulator 231 and the heat conductor 232 after installation and cooperation in the first direction X.

[0154] The battery cell 20 provided in one embodiment of this application, through the above-described configuration, achieves significant improvements in multiple technical aspects, the specific beneficial effects of which are as follows:

[0155] First, it optimizes structural thickness and heat dissipation performance. By setting the support member 23 as a composite structure in which the heat conductor 232 is embedded in the recess 233 of the insulator 231, the overall thickness of the support member 23 can be effectively reduced compared to the traditional single-material support member 23, while meeting the same heat dissipation performance requirements. The heat conductor 232 contacts the outer shell 21, creating an efficient heat dissipation channel, allowing the heat generated by the battery cell 20 during operation to be quickly conducted to the outside of the shell 211, ensuring that the operating temperature of the battery cell remains within a reasonable range.

[0156] Secondly, it enhances electrical safety performance. The special arrangement of insulator 231 surrounding heat conductor 232 effectively prevents direct contact between metal debris and heat conductor 232 during battery cell operation, even if metal debris is generated by the electrode assembly 22. This avoids internal short circuits caused by metal debris contacting heat conductor 232. This design eliminates potential safety hazards at the structural level and significantly improves the reliability of the battery cell 20 system during operation.

[0157] In some embodiments, the insulator 231 includes a base plate 2311 and a side plate 2322 disposed around the base plate 2311. The base plate 2311 and the side plate 2322 surround to form a recess 233. Along the first direction X, one end of the heat conductor 232 abuts against the base plate 2311, and the other end of the heat conductor 232 abuts against the outer casing 21.

[0158] The base plate 2311 and the side plate 2322 can be integrally formed, or they can be fixedly connected together by means of adhesive bonding. An integral structure is optional.

[0159] The orthographic projection of the base plate 2311 in the first direction X includes, but is not limited to, a circle, an ellipse, or a polygon. The side plate 2322 may be in the form of a closed ring. The orthographic projection of the side plate 2322 as a whole in the first direction X may be in the form of a circular ring, an elliptical ring, or a polygonal ring. When it is in the form of a polygonal ring, for example, the base plate 2311 may be quadrilateral and the side plate 2322 may be in the form of a quadrilateral ring.

[0160] Along the first direction X, the thickness of the heat conductor 232 can be equal to the depth of the recess 233. The heat conductor 232 is disposed in the recess 233, with one end abutting against the base plate 2311 of the insulator 231 and the other end abutting against the wall of the outer casing 21 in the first direction X.

[0161] The battery cell 20 provided in one embodiment of this application, through the above-described configuration, not only ensures the mechanical strength of the support member 23, but also guarantees the heat conduction path. In principle, the base plate 2311 and the side plate 2322 together form a stable support frame, in which the heat conductor 232 is embedded, which not only ensures the support of the electrode assembly, but also promotes the uniform distribution of heat.

[0162] like Figure 10 , Figure 11 As shown, in some embodiments, one of the heat conductor 232 and the insulator 231 is provided with a protrusion 234 and the other is provided with a groove 235. The shape of the protrusion 234 matches the shape of the groove 235, and the protrusion 234 is inserted into the groove 235.

[0163] The heat conductor 232 and the insulator 231 can be engaged with each other through the protrusion 234 and the groove 235.

[0164] The depth of the groove 235 can match the protrusion height of the protrusion 234. Of course, the height of the protrusion 234 can also be less than or equal to the depth of the groove 235.

[0165] The groove 235 can be circular, elliptical, or polygonal. Correspondingly, the shape of the protrusion 234 matches and interlocks with the shape of the groove 235.

[0166] The number of protrusions 234 and the number of grooves 235 can be equal and set in a one-to-one ratio. The number of protrusions 234 and grooves 235 can both be more than two.

[0167] One embodiment of the battery cell 20 provided in this application features an interlocking structure design. This design strengthens the connection between the heat conductor 232 and the insulator 231 by providing a protrusion 234 on one and a groove 235 on the other, thereby improving the overall structural reliability. Furthermore, the matching design of the protrusion 234 and the groove 235 increases the contact area, reduces thermal resistance, and prevents relative movement between the two, ensuring the structural stability of the battery cell 20.

[0168] In some embodiments, the thickness of the base plate 2311 along the first direction X is b, wherein 0.03 mm ≤ b ≤ 0.5 mm.

[0169] The thickness b of the base plate 2311 can be any value between 0.03 mm and 0.5 mm. Optionally, the thickness b of the base plate 2311 can be selected as 0.1 mm ≤ b ≤ 0.2 mm.

[0170] The thickness of the base plate 2311 can be understood as the vertical distance between the two end faces in the first direction X. If the base plate 2311 is provided with a protrusion 234 or a groove 235, then the thickness of the base plate 2311 can be understood as the thickness of the area in the first direction X where no protrusion 234 or groove 235 is provided.

[0171] Referring to Table 4, in one embodiment of this application, the thickness b of the base plate 2311 of the battery cell 20 is 0.03 mm ≤ b ≤ 0.5 mm. This reasonable base plate 2311 thickness design ensures both support strength and insulation requirements, reduces the length of the heat conduction path, and improves heat dissipation while meeting the high capacity requirements of the battery cell 20, thus guaranteeing cycle life. Furthermore, when 0.1 mm ≤ b ≤ 0.2 mm, the 80% SOH cycle number is close to or exceeds 1700, resulting in a more advantageous cycle life.

[0172] Table 4

[0173]

[0174] In some embodiments, the side panel 2322 includes a first sub-plate 2322a disposed opposite to each other along the second direction Y and a second sub-plate 2322b disposed opposite to each other along the third direction Z. Each second sub-plate 2322b is connected to one of the first sub-plates 2322a at both ends. The first direction X, the second direction Y and the third direction Z are intersecting each other.

[0175] The second direction Y can be the thickness direction of the battery cell 20 or the casing 21. The third direction Z can be the width direction of the battery cell 20 or the casing 21.

[0176] The first direction X, the second direction Y, and the third direction Z can be chosen to be perpendicular to each other.

[0177] One embodiment of this application provides a battery cell 20 with a side plate 2322 comprising the aforementioned structural form, such that the overall orthographic projection of the side plate 2322 in the first direction X can be quadrilateral, which facilitates adaptation to the shape of the outer casing 21 and the shape of the electrode assembly 22, ensuring support for the electrode assembly 22 and meeting heat transfer requirements. The first sub-plate 2322a and the second sub-plate 2322b together form a recess 233, which effectively restricts the heat conductor 232 while providing multidirectional heat conduction paths. This ensures the structural stability and heat dissipation efficiency of the battery cell 20, and improves the cycle life of the battery cell 20.

[0178] like Figures 5 to 9 As shown, in some embodiments, the area of ​​the first sub-plate 2322a is larger than the area of ​​the second sub-plate 2322b. Along the third direction Z, the heat conductor 232 has a first end face A1 disposed opposite to the heat conductor 232, and the second sub-plate 2322b has a second end face A2 disposed away from the heat conductor 232. The vertical distance between the first end face A1 and the second end face A2 is c, where 0.02 mm ≤ c ≤ 0.2 mm.

[0179] The heat conductor 232 has a first end face A1 at both ends in the third direction Z. A second sub-plate 2322b is respectively provided for each first end face A1. The first end face A1 and the second sub-plate 2322b provided on the same side in the third direction Z can be spaced apart or abutted. The second sub-plate 2322b has a second end face A2 located away from the heat conductor 232 in the third direction Z. In the third direction Z, the vertical distance c between the first end face A1 and the second end face A2 can be any value between 0.02 mm and 2 mm. Optionally, it can include any value between 0.03 mm and 0.16 mm. In some optional embodiments, the vertical distance c between the first end face A1 and the second end face A2 can be 0.1 mm, 0.12 mm, etc.

[0180] Referring to Table 5, in one embodiment of this application, the battery cell 20 has a large-area design of the first sub-plate 2322a, which provides a wider heat conduction path. The distance c between the second sub-plate 2322b and the heat conductor 232 satisfies 0.02 mm ≤ c ≤ 0.2 mm. By adopting the above numerical range, the efficiency of heat conduction can be guaranteed, the temperature rise of the battery cell 20 can be reduced, and the cycle life of the battery cell 20 can be guaranteed, so that the 80% SOH cycle number is above 1700. Furthermore, the 80% SOH cycle number can be further improved when the range is 0.03 mm ≤ c ≤ 0.16 mm.

[0181] Table 5

[0182]

[0183] In some embodiments, the thickness of the second sub-plate 2322b along the third direction Z is e, where e ≥ 0.02 mm.

[0184] In the third direction Z, the second sub-board 2322b has two opposing end faces, and the thickness e of the second sub-board 2322b can be the vertical distance between the two end faces of the second sub-board 2322b. The thickness of the second sub-board 2322b can be 0.02mm, or it can be greater than 0.02mm.

[0185] One embodiment of the battery cell 20 provided in this application ensures the insulation requirements of the second sub-plate 2322b by making the thickness e of the second sub-plate 2322b greater than or equal to 0.02 mm. This reduces the probability of the second sub-plate 2322b being punctured by debris generated by the electrode assembly 22, thereby improving the reliability of the battery cell 20.

[0186] Continue reading Figures 5 to 9 As shown, in some embodiments, the area of ​​the first sub-plate 2322a is larger than the area of ​​the second sub-plate 2322b. Along the second direction Y, the heat conductor 232 has a third end face A3 disposed opposite to the heat conductor 232, and the first sub-plate 2322a has a fourth end face A4 disposed away from the heat conductor 232. The vertical distance between the third end face A3 and the fourth end face A4 is d, where 0.02mm≤d≤0.15mm.

[0187] The heat conductor 232 has a third end face A3 at both ends in the second direction Y. A first sub-plate 2322a is provided for each third end face A3. The third end face A3 and the first sub-plate 2322a on the same side in the second direction Y can be spaced apart or abutted. The first sub-plate 2322a has a fourth end face A4 located away from the heat conductor 232 in the second direction Y. The vertical distance d between the third end face A3 and the fourth end face A4 in the second direction Y can be any value between 0.02 mm and 0.15 mm. Optionally, it can include any value between 0.03 mm and 0.08 mm. In some optional embodiments, the vertical distance d between the third end face A3 and the fourth end face A4 can be 0.05 mm, 0.06 mm, 0.07 mm, etc.

[0188] Referring to Table 6, in one embodiment of this application, the large-area design of the first sub-plate 2322a in the battery cell 20 provides a wider heat conduction path. The distance d between the first sub-plate 2322a and the heat conductor 232 satisfies 0.02mm ≤ d ≤ 0.15mm. Using this numerical range also helps ensure efficient heat conduction, reduces the temperature rise of the battery cell 20, and guarantees the cycle life of the battery cell 20. This results in an 80% SOH cycle count of over 1700, and further improvement in the 80% SOH cycle count within the range of 0.03 mm ≤ c ≤ 0.08 mm.

[0189] Table 6

[0190]

[0191] In some embodiments, the thickness of the first sub-plate 2322a along the second direction Y is f, where f ≥ 0.02 mm.

[0192] In the second direction Y, the first sub-plate 2322a has two opposing end faces, and the thickness f of the first sub-plate 2322a can be the perpendicular distance between the two end faces of the first sub-plate 2322a. The thickness of the first sub-plate 2322a can be 0.02mm, or it can be greater than 0.02mm.

[0193] One embodiment of the battery cell 20 provided in this application ensures the insulation requirements of the first sub-plate 2322a by making the thickness f of the first sub-plate 2322a greater than or equal to 0.02 mm. This reduces the probability of the first sub-plate 2322a being punctured by debris generated by the electrode assembly 22, thereby improving the reliability of the battery cell 20.

[0194] Continue reading Figures 3 to 9 As shown, in some embodiments, the housing 21 includes a housing 211 and a cover plate 212. The housing 211 has an opening in a first direction X, and the cover plate 212 is configured to close the opening. The housing 211 includes a bottom wall 2111 disposed opposite to the opening, and a support member 23 is disposed between the bottom wall 2111 and the electrode assembly 22.

[0195] Optionally, the housing 211 may include a bottom wall 2111, a pair of first side walls 2112, and a pair of second side walls 2113. The pair of first side walls 2112 are spaced apart in the second direction Y and connected to the bottom wall 2111 respectively. The pair of second side walls 2113 are spaced apart in the third direction Z and connected to the bottom wall 2111 and the first side walls 2112 respectively. The area of ​​the first side wall 2112 may be larger than the area of ​​the second side wall 2113.

[0196] In one embodiment of this application, the battery cell 20 is provided. Through the above-described arrangement, the tight fit between the support member 23 and the bottom wall 2111 reduces the thermal resistance on the heat conduction path, which is conducive to the rapid dissipation of heat and ensures the cycle life of the battery cell 20.

[0197] like Figure 3 as well as Figure 4 As shown in the preferred embodiment: One embodiment of this application provides a battery cell 20, including a housing 21, an electrode assembly 22, and a support member 23. The housing 21 has a receiving cavity 213, and the electrode assembly 22 is disposed within the receiving cavity 213. The support member 23 is disposed within the receiving cavity 213, and the support member 23 and the electrode assembly 22 are distributed along a first direction X, with the support member 23 located between the electrode assembly 22 and the housing 21. Along the first direction X, the thickness of the support member 23 is 'a', and the height of the housing 21 is 'h'. The thickness 'a' of the support member 23 and the height 'h' of the housing 21 satisfy a / h = 18.6 × 10⁻⁶. -4 The outer casing 21 is generally square-shaped and includes a housing 211 and a cover plate 212. The housing 211 includes a bottom wall 2111, a pair of first side walls 2112, and a pair of second side walls 2113. The support member 23 is an integral plate-shaped component located within the receiving cavity 213. The support member 23 is stacked on the bottom wall 2111 of the housing 211 and is made of aluminum oxide. The battery cell 20 has a capacity of 530 Ah, and the thickness of the support member 23 in the first direction X is 0.5 mm.

[0198] One aspect of this application provides a battery device 100, including a battery cell 20 as described above.

[0199] One aspect of this application provides an energy storage device, including the aforementioned battery cell 20 or the aforementioned battery device 100, wherein the battery cell 20 or the battery device 100 is used to store or provide electrical energy.

[0200] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0201] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0202] In some embodiments, the energy storage device 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.

[0203] As an example, the thermal management module may include a liquid cooling unit that supplies coolant to each battery device 100 via piping to regulate the temperature of the individual battery cells 20.

[0204] As an example, the main control module can serve as the battery management unit for the battery cluster, used to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power, or temperature of the battery cluster. For instance, it can control the charging and discharging current and voltage of the battery cluster. The main control module includes modules such as an auxiliary battery management unit (SBMU) and a fusion switch.

[0205] As an example, the central control module can serve as the battery management unit for an energy storage device, used to monitor and manage the device. The central control module can monitor information such as the energy storage device's current, voltage, power, state of charge, or temperature. For instance, it can control the charging and discharging current and voltage of the energy storage device. 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.

[0206] As an example, a fire protection system includes control panels, detectors, alarm devices, etc., used to detect, alarm, or extinguish fires in energy storage systems.

[0207] As an example, the power distribution unit can be used to distribute power to the power modules of the energy storage device.

[0208] like Figure 12 As shown, one aspect of this application provides an energy storage system 30, including a power conversion device and the aforementioned energy storage device 31, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device 31.

[0209] In some embodiments, the energy storage system 30 may include one or more energy storage devices 31 and a power conversion system (PCS), wherein the power conversion system 32 is used to connect between the power generation device 33 and the energy storage device 31. The power generation device 33 is used to generate electrical energy, and the electrical energy generated by the power generation device 33 can be stored in the energy storage device 31 through the power conversion system 32. As an example, the power generation device 33 may specifically be a solar panel, a hydroelectric power generation device 33, a thermal power generation device 33, a wind power generation device 33, etc. The specific type of the power generation device 33 is not limited in this application.

[0210] One aspect of this application provides an electrical device, including the aforementioned battery cell 20, the aforementioned battery device 100, the aforementioned energy storage device 31, or the aforementioned energy storage system 30, wherein the battery cell 20 or the battery device 100 is used to store or provide electrical energy.

[0211] like Figure 13 As shown, one aspect of this application provides a charging network 40, including a charging pile 41 and the aforementioned energy storage device 31 or the aforementioned energy storage system 30, wherein the energy storage device 31 is used to provide electrical energy to the charging pile 41.

[0212] This application provides a charging network 40, including a charging pile 41 and an energy storage device 31. The charging pile 41 is electrically connected to the energy storage device 31, which provides electrical energy to the charging pile 41. The charging pile 41 is electrically connected to a battery device 100 in the energy storage device 31 via a cable, and the battery device 100 can provide its stored electrical energy to the charging pile 41. The charging pile 41 has one or more connectors 42 for connecting to electrical equipment (such as a vehicle 1), thereby providing power to the electrical equipment. The definition of the battery device 100 is given in section 2.6.

[0213] The energy storage device 31 can be located inside the charging pile 41 (e.g., an integrated energy storage and charging unit) or outside the charging pile 41.

[0214] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer shell has a receiving cavity; The electrode assembly is disposed within the receiving cavity; A support member is disposed within the receiving cavity, the support member and the electrode assembly are distributed along a first direction, and the support member is located between the electrode assembly and the outer shell; Wherein, along the first direction, the thickness dimension of the support member is 'a', and the height dimension of the outer shell is 'h', and the thickness dimension 'a' of the support member and the height dimension 'h' of the outer shell satisfy: 4 × 10 -4 ≤a / h≤30×10 -4 .

2. The battery cell according to claim 1, characterized in that, The thickness dimension 'a' of the support member and the height dimension 'h' of the outer shell satisfy the following condition: 5.5 × 10⁻⁶. -4 ≤a / h≤20×10 -4 .

3. The battery cell according to claim 1, characterized in that, The capacity of the battery cell is greater than or equal to 360Ah and less than or equal to 1500Ah, and the thickness a of the support member satisfies 0.1mm≤a≤0.8mm.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The support includes at least one of a heat conductor and an insulator.

5. The battery cell according to claim 4, characterized in that, The heat conductor includes at least one of copper heat conductor, aluminum heat conductor, graphite heat conductor, boron nitride heat conductor, and alumina heat conductor, and the insulator includes at least one of boron nitride insulation, alumina insulation, polypropylene insulation, polyethylene insulation, polyethylene terephthalate insulation, and polyacetamide insulation.

6. The battery cell according to claim 4, characterized in that, The support includes the heat conductor and the insulator. The insulator has a recess on the side opposite to the electrode assembly in the first direction. The heat conductor is disposed in the recess. Along the first direction, the insulator abuts against the electrode assembly, and the heat conductor abuts against the outer shell.

7. The battery cell according to claim 6, characterized in that, One of the heat conductor and the insulator is provided with a protrusion and the other is provided with a groove. The shape of the protrusion matches the shape of the groove, and the protrusion is inserted into the groove.

8. The battery cell according to claim 6, characterized in that, The insulator includes a base plate and a side plate disposed around the base plate. The base plate and the side plate together form the recess. Along the first direction, one end of the heat conductor abuts against the base plate, and the other end of the heat conductor abuts against the outer shell.

9. The battery cell according to claim 8, characterized in that, Along the first direction, the thickness of the base plate is b, where 0.03 mm ≤ b ≤ 0.5 mm.

10. The battery cell according to claim 8, characterized in that, The side panel includes a first sub-plate disposed opposite to each other along a second direction and a second sub-plate disposed opposite to each other along a third direction. Each end of the second sub-plate is connected to one of the first sub-plates. The first direction, the second direction and the third direction are intersecting each other.

11. The battery cell according to claim 10, characterized in that, The area of ​​the first sub-plate is larger than the area of ​​the second sub-plate. Along the third direction, the heat conductor has a first end face that is disposed opposite to the heat conductor, and the second sub-plate has a second end face that is disposed away from the heat conductor. The vertical distance between the first end face and the second end face is c, where 0.02 mm ≤ c ≤ 0.2 mm.

12. The battery cell according to claim 11, characterized in that, Along the third direction, the thickness of the second sub-plate is e, where e ≥ 0.02 mm.

13. The battery cell according to claim 10, characterized in that, The area of ​​the first sub-plate is larger than the area of ​​the second sub-plate. Along the second direction, the heat conductor has a third end face that is disposed opposite to the heat conductor. The first sub-plate has a fourth end face that is disposed away from the heat conductor. The vertical distance between the third end face and the fourth end face is d, where 0.02mm≤d≤0.15mm.

14. The battery cell according to claim 13, characterized in that, Along the second direction, the thickness of the first sub-plate is f, where f ≥ 0.02 mm.

15. The battery cell according to any one of claims 1 to 3, characterized in that, The housing includes a shell and a cover plate. The shell has an opening in the first direction, and the cover plate is used to close the opening. The shell includes a bottom wall opposite to the opening, and the support member is disposed between the bottom wall and the electrode assembly.

16. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 15.

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

18. An energy storage system, characterized in that, It includes a power conversion device and an energy storage device as described in claim 17, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device.

19. An electrical appliance, characterized in that, Includes a battery cell according to any one of claims 1 to 15, a battery device according to claim 16, an energy storage device according to claim 17, or an energy storage system according to claim 18, wherein the battery cell or the battery device is used to store or provide electrical energy.

20. A charging network, characterized in that, It includes a charging pile and an energy storage device as described in claim 17 or an energy storage system as described in claim 18, wherein the energy storage device is used to provide electrical energy to the charging pile.

Images