Battery cell and energy storage device

Abstract

The application relates to the technical field of batteries, in particular to a battery monomer and an energy storage device. The battery monomer comprises a shell, an electrode assembly and an electrode terminal, the inside of the shell is provided with a cavity, the electrode assembly is arranged in the cavity and is provided with a tab, the electrode terminal is arranged on the shell and is electrically connected with the tab, the shell has a length dimension L, a width dimension W and a height dimension H, wherein H < W <= L, 600 mm <= L <= 2400 mm, and L / W is less than or equal to 3.7. According to the battery monomer, the length dimension and the width dimension of the shell are increased by setting the length dimension L of the shell as 600 mm <= L <= 2400 mm and setting L / W as less than or equal to 3.7, so that the size of the electrode assembly in the shell is increased, and the space utilization and the energy storage effect of the battery monomer are improved.

Description

Technical Field

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

[0002] Currently, with the continuous growth of global energy demand and the increasing awareness of environmental protection, energy storage technology has gradually become one of the important means to solve energy problems.

[0003] Energy storage containers, as a new type of energy storage device, have advantages such as portability, flexibility, and high efficiency, and are widely used in power systems, transportation, aerospace, and other fields. The battery cells, as the core component of energy storage containers, directly affect the efficiency and economy of the containers' use.

[0004] In related technologies, due to limitations in the internal resistance and overcurrent of individual battery cells, the size of individual battery cells is not designed to be too large, thereby reducing the space utilization of individual battery cells and consequently reducing the energy storage effect of individual battery cells. Summary of the Invention

[0005] In view of the deficiencies in the existing technology, the purpose of this application is to provide a battery cell and an energy storage device that can effectively solve the problem of low space utilization of battery cells. This objective is achieved through the following means:

[0006] In a first aspect, this application provides a battery cell, the battery cell comprising:

[0007] The outer casing has an internal cavity;

[0008] Electrode assembly, disposed within a cavity and equipped with tabs; and

[0009] Electrode terminals are disposed on the housing and electrically connected to the electrode tabs;

[0010] The outer shell has a length dimension L, a width dimension W, and a height dimension H, wherein H < W ≤ L, and 600mm ≤ L ≤ 2400mm, and L / W is less than or equal to 3.7.

[0011] According to the battery cell of this application, by setting the length L of the casing to 600mm≤L≤2400mm and setting L / W to less than or equal to 3.7, the length and width of the casing can be increased, thereby increasing the size of the electrode assembly inside the casing, and thus improving the space utilization and energy storage effect of the battery cell.

[0012] At the same time, by increasing the length and width of the casing, the surface area of ​​the casing is increased, which also improves the heat dissipation of the battery cells.

[0013] In some embodiments of this application, 1.5 ≤ L / W ≤ 2.7.

[0014] Setting 1.5≤L / W≤2.7 increases the width of the casing, thereby increasing the size of the electrode assembly inside the casing, which in turn improves the space utilization and energy storage efficiency of the battery cells.

[0015] In some embodiments of this application, 5mm ≤ H ≤ 30mm.

[0016] Setting the height H of the casing to 5mm≤H≤30mm allows for a reduction in casing height without exceeding the overcurrent limit of the battery cell, thereby increasing the length and width of the casing and improving the heat dissipation of the battery cell.

[0017] In some embodiments of this application, 2000mm≤L≤2300mm.

[0018] Setting the length L of the casing to 2000mm≤L≤2300mm increases the length of the casing, thereby increasing the size of the electrode components inside the casing, and thus improving the space utilization and energy storage effect of the battery cells.

[0019] In some embodiments of this application, 70 ≤ L / H ≤ 320.

[0020] By setting the length and height of the casing according to the above proportions, the length of the casing can be increased without exceeding the overcurrent limit of the battery cell, thereby improving the heat dissipation effect of the battery cell.

[0021] In some embodiments of this application, 210 ≤ L / H ≤ 320.

[0022] By setting the length and height of the battery body according to the above proportions, the length of the casing can be increased without exceeding the overcurrent limit of the battery cell, thereby improving the heat dissipation effect of the battery cell.

[0023] In some embodiments of this application, the outer casing has a volume dimension V, where V = L * W * H, and 0.000014 / mm. 2 ≤L / V≤0.000265 / mm 2 .

[0024] By setting the length and volume of the casing according to the above proportions, the length of the casing can be increased, thereby improving the space utilization of the battery cell.

[0025] In some embodiments of this application, the outer casing has a volume dimension V, where V = L * W * H, and 0.00000019 / mm. 2≤H / V≤0.00000093 / mm 2 .

[0026] By setting the height and volume of the casing according to the above proportions, the height of the casing can be reduced without exceeding the overcurrent limit of the battery cell, thereby increasing the length and width of the casing and thus improving the heat dissipation effect of the battery cell.

[0027] In some embodiments of this application, the outer casing has a volume dimension V, where V = L * W * H, and 0.000014 / mm. 2 ≤W / V≤0.000071 / mm 2 .

[0028] By setting the width and volume of the casing according to the above proportions, the width of the casing can be increased, thereby improving the heat dissipation effect of the battery cells.

[0029] In some embodiments of this application, the outer shell has a surface area dimension S and a volume dimension V, wherein S = 2L*W + 2L*H + 2W*H, V = L*W*H, and 0.067 / mm ≤ S / V ≤ 0.286 / mm.

[0030] By setting 0.067 / mm≤S / V≤0.286 / mm, the surface area of ​​the casing can be increased, thereby improving the heat dissipation of the battery cells.

[0031] In some embodiments of this application, the battery cell has a capacity E, wherein 0.1212 mm / Ah ≤ L / E ≤ 1.74 mm / Ah.

[0032] When battery cells of different lengths have the same capacity E, the smaller the L / E ratio, the larger the capacity value per unit length, and the greater the capacity density. Setting the length of the casing and the capacity E of the battery cell according to the above ratio can effectively improve the capacity density per unit length of the battery cell.

[0033] In some embodiments of this application, 0.1212mm / Ah ≤ L / E ≤ 0.8mm / Ah.

[0034] By setting the length of the casing and the capacity E of the battery cell in the above ratio, the capacity density per unit length of the battery cell can be increased.

[0035] In some embodiments of this application, the outer casing has a surface area dimension S, and the battery cell has a capacity E, wherein S = 2L*W + 2L*H + 2W*H, 130.9mm² 2 / Ah≤S / E≤3680mm 2 / Ah.

[0036] By using 130.9mm 2 / Ah≤S / E≤3680mm 2 The / Ah setting can increase the capacity density per unit area of ​​a single battery cell.

[0037] In some embodiments of this application, the casing has a volume dimension V, and the battery cell has a capacity E, where V = L * W * H, 3024 mm² 3 / Ah≤V / E≤55200mm 3 / Ah.

[0038] By using 3024mm 3 / Ah≤V / E≤55200mm 3 The / Ah setting can increase the capacity density per unit volume of a single battery cell.

[0039] In some embodiments of this application, the outer shell is a prismatic shell made of metal.

[0040] Setting the casing to a prismatic shape made of metal can effectively increase the surface area of ​​the battery cells and improve their heat dissipation capacity.

[0041] In some embodiments of this application, the electrode terminal includes a first electrode terminal and a second electrode terminal, the first electrode terminal and the second electrode terminal have opposite polarities, the first electrode terminal and the second electrode terminal are respectively disposed at both ends of the length direction of the housing, or the first electrode terminal and the second electrode terminal are respectively disposed at both ends of the width direction of the housing.

[0042] The first electrode terminal and the second electrode terminal can be positioned appropriately on the housing according to wiring requirements, so as to facilitate the connection of the first electrode terminal and the second electrode terminal to the external wiring respectively.

[0043] In some embodiments of this application, the battery cell further includes a plurality of first electrode terminals and a plurality of second electrode terminals, wherein the polarities of the first electrode terminals and the second electrode terminals are opposite.

[0044] Multiple first electrode terminals are located at one end of the housing in the width direction and are spaced apart along the length direction of the housing; multiple second electrode terminals are located at the other end of the housing in the width direction and are spaced apart along the length direction of the housing.

[0045] Alternatively, multiple first electrode terminals are respectively disposed at both ends of the width direction of the housing, and multiple second electrode terminals are respectively disposed at both ends of the width direction of the housing. The first electrode terminals and second electrode terminals located at the same end are spaced apart along the length direction of the housing, and the first electrode terminals and second electrode terminals located at both ends are arranged opposite each other along the width direction of the housing.

[0046] Multiple first electrode terminals and multiple second electrode terminals can be rationally positioned on the housing according to wiring requirements, thereby facilitating the connection of the first electrode terminals and the second electrode terminals to external wiring respectively.

[0047] In some embodiments of this application, the battery cell further includes at least one pressure relief mechanism, and the pressure relief mechanism is provided at least one end of the housing in the width or length direction.

[0048] By installing a pressure relief mechanism on the casing, when the internal pressure or temperature of a battery cell reaches a threshold, the pressure relief mechanism can open and release the internal pressure of the battery cell, thereby improving the safety performance of the battery cell.

[0049] In some embodiments of this application, there are multiple pressure relief mechanisms, which are located at one end of the width direction of the housing and are spaced apart along the length direction of the housing.

[0050] By setting multiple pressure relief mechanisms and arranging them at intervals along the length of the casing at one end of the width direction, when the internal pressure or temperature of the battery cell reaches a threshold, one or more of the multiple pressure relief mechanisms can open and release the internal pressure of the battery cell, thereby improving the safety performance of the battery cell.

[0051] Secondly, this application proposes an energy storage device, which includes:

[0052] The box has an internal cavity for receiving contents.

[0053] At least one battery cluster is disposed in a receiving cavity. The battery cluster includes multiple battery modules connected in series. Each battery module includes multiple battery cells arranged in a vertical direction. The battery cells are any of the battery cells described above.

[0054] In some embodiments of this application, the receiving cavity is provided with an insertion interface on one side along the horizontal direction, and the battery module is inserted into the receiving cavity through the insertion interface. The length and width directions of the outer shell extend horizontally, the height direction of the outer shell extends vertically, and the length direction of the outer shell is consistent with the insertion direction.

[0055] By aligning the length of the casing with the insertion direction, the number of battery cells along the insertion direction can be reduced, thus facilitating the assembly of battery cells within the casing.

[0056] In some embodiments of this application, the energy storage device further includes a tray, which is fixedly connected to the housing, and the battery module is disposed above the tray and fixedly connected to the tray.

[0057] By fixing the battery module to the tray, the battery module can be fixed inside the box without the need for a frame structure to assemble multiple battery cells into a battery module. This reduces the space occupied by the frame structure inside the box and thus improves the space utilization rate of the battery cells inside the box.

[0058] 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

[0059] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0060] Figure 1 Axonometric view of a battery cell provided for some embodiments of this application;

[0061] Figure 2 A top view of a battery cell provided for some embodiments of this application;

[0062] Figure 3 A top view of a battery cell provided for other embodiments of this application;

[0063] Figure 4 A top view of a battery cell provided for other embodiments of this application;

[0064] Figure 5 A top view of a battery cell provided for other embodiments of this application;

[0065] Figure 6 A front view showing the distribution of battery cells in an energy storage device provided for some embodiments of this application;

[0066] Figure 7 A top view showing the distribution of battery cells in an energy storage device provided for some embodiments of this application;

[0067] Figure 8 This is a schematic diagram of the structure of a battery module in an energy storage device provided in some embodiments of this application.

[0068] The labels in the attached diagram are as follows:

[0069] 100. Battery cell;

[0070] 10. Outer shell; 11. First wall;

[0071] 21. First electrode terminal; 22. Second electrode terminal;

[0072] 30. Pressure relief mechanism;

[0073] 40. Sampling chip;

[0074] 200. Box body;

[0075] 300. Battery cluster; 310. Battery module; 320. Conductive sheet; 330. Heat exchange plate;

[0076] 400. Pallet;

[0077] 500, bracket;

[0078] 600. Fixing plate;

[0079] 700, partition;

[0080] 1000, Energy Storage Containers;

[0081] X: Length direction of the outer shell; Y: Width direction of the outer shell; Z: Height direction of the outer shell; A: Length direction of the receiving cavity; B: Width direction of the receiving cavity; C: Height direction of the receiving cavity. Detailed Implementation

[0082] 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.

[0083] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0084] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0085] In this document, the term "implementation" means that a specific feature, structure, or characteristic described in connection with an implementation may be included in at least one implementation of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same implementation, nor is it a separate or alternative implementation mutually exclusive with other implementations. It will be explicitly and implicitly understood by those skilled in the art that the implementations described herein can be combined with other implementations.

[0086] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0087] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple groups" refers to two or more (including two groups), and "multiple pieces" refers to two or more (including two pieces).

[0088] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "height", "up", "down", "front", "back", "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.

[0089] In the description of the embodiments of this application, unless otherwise explicitly 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.

[0090] Energy storage containers, as a new type of energy storage device, have advantages such as portability, flexibility, and high efficiency, and are widely used in power systems, transportation, aerospace, and other fields. The battery cells, as the core component of energy storage containers, directly affect the efficiency and economy of the containers' use.

[0091] In related technologies, due to limitations in the internal resistance and overcurrent of individual battery cells, the size of individual battery cells is not designed to be too large, thereby reducing the space utilization of individual battery cells and consequently reducing the energy storage effect of individual battery cells.

[0092] To address the issue of low space utilization in battery cells, this application proposes a battery cell and an energy storage device incorporating the battery cell. The battery cell of this application can increase the length and width of the casing, thereby increasing the size of the electrode assembly inside the casing, and thus improving the space utilization and energy storage effect of the battery cell.

[0093] The battery cells in this application are not only applicable to energy storage devices, but also to various electrical devices that use batteries, such as laptops, electric vehicles, electric toys, power tools, electric vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. The batteries are used to provide electrical energy to the aforementioned electrical devices.

[0094] However, for the sake of brevity, the following implementation methods will all be described using battery cells as an example of energy storage devices.

[0095] In some embodiments of this application, the energy storage device may include a cabinet and one or more battery clusters housed within the cabinet.

[0096] A battery cluster may include multiple battery modules, which are connected in series via a busbar to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0097] 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. The energy storage system provided in this application can be any power system that requires energy storage devices.

[0098] In some embodiments of this application, the energy storage device is an energy storage container or an energy storage cabinet.

[0099] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, the battery cell 100 includes a housing 10, an electrode assembly (not shown in the figure), and electrode terminals. The housing 10 has an internal cavity, the electrode assembly is disposed in the cavity and has tabs (not shown in the figure), and the electrode terminals are disposed on the housing 10 and electrically connected to the tabs. The housing 10 has a length dimension L, a width dimension W, and a height dimension H, wherein H < W ≤ L, and 600 mm ≤ L ≤ 2400 mm, and L / W is less than or equal to 3.7.

[0100] Specifically, the outer casing 10 forms the overall appearance structure of the battery cell 100, and an electrode assembly is formed inside it, with electrode terminals protruding from the outside of the outer casing 10. The outer casing 10 can be a heat-conducting component made of metal. In addition to having good thermal conductivity, the metal casing also has sufficient structural strength, making it less prone to deformation when subjected to compression or impact, thus improving the safety performance of the outer casing 10. Optionally, the material of the outer casing 10 can be steel, iron, aluminum, aluminum alloy, etc. The outer casing 10 can be a strip structure or a block structure, and has a length dimension L, a width dimension W, and a height dimension H, wherein H < W ≤ L.

[0101] An electrode assembly is formed inside the casing 10. This electrode assembly is the component in the battery cell 100 where electrochemical reactions occur. The casing 10 may contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab (not shown in the figure). The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery cell 100, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0102] Where L can be any value between 600mm...1000mm...1800mm...2400mm. The L / W ratio can be any value between 1...1.5...2...2.5...3...3.7. When L / W = 1, the length of the outer shell 10 is equal to its width, and the outer shell 10 has a block-like structure. When L / W > 1, the length of the outer shell 10 is greater than its width, and the outer shell 10 has a strip-like structure.

[0103] According to the battery cell 100 of this application, by setting the length L of the casing 10 to 600mm≤L≤2400mm and setting L / W to less than or equal to 3.7, the length and width of the casing 10 can be increased, thereby increasing the size of the electrode assembly inside the casing 10, and thus improving the space utilization and energy storage effect of the battery cell 100.

[0104] At the same time, by increasing the length and width of the outer casing 10, the surface area of ​​the outer casing 10 is increased, thus improving the heat dissipation effect of the battery cell 100. Specifically, in combination... Figure 1 and Figure 2 As shown, in some embodiments of this application, 1.5 ≤ L / W ≤ 2.7.

[0105] Specifically, the L / W ratio can be any value between 1.5…2…2.5…2.7.

[0106] Setting 1.5≤L / W≤2.7 increases the width of the housing 10, thereby increasing the size of the electrode assembly inside the housing 10, and thus improving the space utilization and energy storage effect of the battery cell 100.

[0107] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, 5mm ≤ H ≤ 30mm

[0108] Specifically, H can be any value between 5mm…10mm…15mm…20mm…30mm.

[0109] Setting the height dimension H of the outer casing 10 to 5mm≤H≤30mm can reduce the height dimension of the outer casing 10 without exceeding the overcurrent limit of the battery cell 100, thereby increasing the length and width dimensions of the outer casing 10 and thus improving the heat dissipation effect of the battery cell 100.

[0110] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, 2000mm≤L≤2300mm.

[0111] Specifically, L can be any value between 2000mm…2100mm…2200mm…2300mm.

[0112] Setting the length L of the outer casing 10 to 2000mm≤L≤2300mm increases the length of the outer casing 10, thereby increasing the size of the electrode assembly inside the outer casing 10, and thus improving the space utilization and energy storage effect of the battery cell 100.

[0113] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, 70 ≤ L / H ≤ 320.

[0114] Specifically, the L / H ratio can be any value between 70...100...150...200...300...320.

[0115] By setting the length and height of the housing 10 according to the above proportions, the length of the housing 10 can be increased without exceeding the overcurrent limit of the battery cell 100, thereby improving the heat dissipation effect of the battery cell 100.

[0116] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, 210 ≤ L / H ≤ 320.

[0117] Specifically, the L / H ratio can be any value between 210...250...300...320.

[0118] By setting the length and height of the housing 10 according to the above proportions, the length of the housing 10 can be increased without exceeding the overcurrent limit of the battery cell 100, thereby improving the heat dissipation effect of the battery cell 100.

[0119] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, the outer casing 10 has a volume dimension V, where V = L * W * H, and 0.000014 / mm². 2 ≤L / V≤0.000265 / mm 2 .

[0120] Specifically, the outer shell 10 has a strip-shaped or block-shaped structure, with a volume dimension V = L * W * H. The ratio of L to V can be 0.000014 / mm². 2 ...0.0001 / mm 2 …0.0002 / mm 2 …0.000265 / mm 2 Any value between.

[0121] By setting the length and volume of the casing 10 according to the above proportions, the length of the casing 10 can be increased without exceeding the overcurrent limit of the battery cell 100, thereby improving the space utilization of the battery cell 100.

[0122] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, the outer casing 10 has a volume dimension V, where V = L * W * H, and 0.00000019 / mm. 2 ≤H / V≤0.00000093 / mm 2 .

[0123] Specifically, the H / V ratio can be 0.00000019 / mm. 2 ...0.00000050 / mm 2 …0.00000093 / mm 2 …0.00000093 / mm 2 Any value between.

[0124] By setting the height and volume of the casing 10 according to the above proportions, the height of the casing 10 can be reduced without exceeding the overcurrent limit of the battery cell 100, thereby increasing the length and width of the casing 10 and improving the heat dissipation effect of the battery cell 100.

[0125] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, the outer casing 10 has a volume dimension V, where V = L * W * H, and 0.000014 / mm². 2 ≤W / V≤0.000071 / mm 2 .

[0126] Specifically, the W / V ratio can be 0.000014 / mm. 2 ...0.000035 / mm 2 …0.000058 / mm 2 …0.000071 / mm 2 Any value between.

[0127] By setting the width and volume of the casing 10 according to the above proportions, the width of the casing 10 can be increased without exceeding the overcurrent limit of the battery cell 100, thereby improving the heat dissipation effect of the battery cell 100.

[0128] Combination Figure 1 and Figure 2As shown, in some embodiments of this application, the outer shell 10 has a surface area dimension S and a volume dimension V, wherein S = 2L*W + 2L*H + 2W*H, V = L*W*H, and 0.067 / mm ≤ S / V ≤ 0.286 / mm.

[0129] Specifically, the surface area of ​​the outer casing 10 refers to the total area of ​​all its outer surfaces. The S / V ratio can be any value between 0.067 / mm…0.15 / mm…0.222 / mm…0.286 / mm.

[0130] By setting 0.067 / mm≤S / V≤0.286 / mm, the surface area of ​​the housing 10 can be increased, thereby improving the heat dissipation effect of the battery cell 100.

[0131] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, the battery cell 100 has a capacity E, wherein 0.1212 mm / Ah ≤ L / E ≤ 1.74 mm / Ah.

[0132] Specifically, the L / E ratio can be any value between 0.1212 mm / Ah...1.2 mm / Ah...1.5 mm / Ah...1.74 mm / Ah.

[0133] When battery cells 100 of different lengths have the same capacity E, the smaller the L / E ratio, the larger the capacity value per unit length, and the greater the capacity density. By setting the length of the casing 10 and the capacity E of the battery cell 100 according to the above ratio, the capacity density per unit length of the battery cell 100 can be effectively increased.

[0134] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, 0.1212mm / Ah ≤ L / E ≤ 0.8mm / Ah.

[0135] Specifically, the L / E ratio can be any value between 0.1212mm / Ah...0.50mm / Ah...0.75mm / Ah...0.8mm / Ah.

[0136] By setting the length of the casing 10 and the capacity E of the battery cell 100 in the above ratio, the capacity density per unit length of the battery cell 100 can be increased.

[0137] Combination Figure 1 and Figure 2As shown, in some embodiments of this application, the casing 10 has a surface area dimension S, and the battery cell has a capacity E, where S = 2L*W + 2L*H + 2W*H, 130.9mm² 2 / Ah≤S / E≤3680mm 2 / Ah.

[0138] Specifically, the S / E ratio can be 130.9 mm. 2 / Ah...1000mm 2 / Ah…2400mm 2 / Ah…3680mm 2 Any value between / Ah.

[0139] By using 130.9mm 2 / Ah≤S / E≤3680mm 2 The / Ah setting can increase the capacity density per unit area of ​​a single battery cell by 100.

[0140] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, the casing 10 has a volume dimension V, and the battery cell 100 has a capacity E, where V = L * W * H, 3024 mm² 3 / Ah≤V / E≤55200mm 3 / Ah.

[0141] Specifically, the V / E ratio can be 3024mm. 3 / Ah…20000mm 3 / Ah…35000mm 3 / Ah…55200mm 3 Any value between / Ah.

[0142] By using 3024mm 3 / Ah≤V / E≤55200mm 3 The / Ah setting can increase the capacity density per unit volume of a single battery cell by 100.

[0143] Combination Figure 1 and Figure 2 As shown, in some embodiments of this application, the outer shell 10 is a prismatic outer shell made of metal.

[0144] Metal materials, including steel, iron, aluminum, and aluminum alloys, offer excellent heat dissipation and structural support. The prismatic outer shell provides the outer shell 10 with multiple surfaces, effectively increasing the surface area of ​​the battery cell 100 and enhancing its heat dissipation capacity.

[0145] Combination Figure 2 and Figure 3 As shown, in some embodiments of this application, the electrode terminal includes a first electrode terminal 21 and a second electrode terminal 22. The first electrode terminal 21 and the second electrode terminal 22 have opposite polarities. The first electrode terminal 21 and the second electrode terminal 22 are respectively disposed at both ends of the length direction of the housing 10, or the first electrode terminal 21 and the second electrode terminal 22 are respectively disposed at both ends of the width direction of the housing 10.

[0146] Specifically, the electrode terminals of the battery cell 100 may include a first electrode terminal 21 and a second electrode terminal 22. The first electrode terminal 21 may be connected to the positive electrode tab to form a positive terminal. The second electrode terminal 22 may be connected to the negative electrode tab to form a negative terminal.

[0147] like Figure 2 As shown, a first electrode terminal 21 and a second electrode terminal 22 are respectively disposed at both ends of the outer casing 10 along the width Y direction of the battery body. Figure 3 As shown, a first electrode terminal 21 and a second electrode terminal 22 are respectively disposed at both ends of the outer casing 10 along the length direction X of the battery body.

[0148] The first electrode terminal 21 and the second electrode terminal 22 can be reasonably selected on the housing 10 according to the wiring requirements, so as to facilitate the connection of the first electrode terminal 21 and the second electrode terminal 22 to the external wiring respectively.

[0149] like Figure 4 As shown, in some embodiments of this application, the electrode terminals include a plurality of first electrode terminals 21 and a plurality of second electrode terminals 22, wherein the polarities of the first electrode terminals 21 and the second electrode terminals 22 are opposite. The plurality of first electrode terminals 21 are commonly disposed at one end of the width direction of the housing 10 and are spaced apart along the length direction of the housing 10, and the plurality of second electrode terminals 22 are commonly disposed at the other end of the width direction of the housing 10 and are spaced apart along the length direction of the housing 10.

[0150] like Figure 5 As shown, in some embodiments of this application, a plurality of first electrode terminals 21 are respectively disposed at both ends of the width direction of the housing 10, and a plurality of second electrode terminals 22 are respectively disposed at both ends of the width direction of the housing 10. The first electrode terminals 21 and second electrode terminals 22 located at the same end are spaced apart along the length direction of the housing 10, and the first electrode terminals 21 and second electrode terminals 22 located at both ends are arranged opposite to each other along the width direction of the housing 10.

[0151] The multiple first electrode terminals 21 and multiple second electrode terminals 22 can be reasonably selected in their positions on the housing 10 according to wiring requirements, so as to facilitate the connection of the first electrode terminals 21 and the second electrode terminals 22 to external wiring respectively. Here, "multiple" means two or more.

[0152] like Figure 1 As shown, in some embodiments of this application, the battery cell 100 further includes at least one pressure relief mechanism 30, and the pressure relief mechanism 30 is provided at least one end of the housing 10 in the width direction or length direction.

[0153] Specifically, the pressure relief mechanism 30 can be located on other side walls of the housing 10 besides the first wall 11, and can be on the same side, opposite side, or adjacent side as the first electrode terminal 21. The first wall 11 of the housing 10 refers to the side wall with the largest area. Optionally, the pressure relief mechanism 30 is an explosion-proof valve.

[0154] By providing a pressure relief mechanism 30 on the housing 10, when the internal pressure or temperature of the battery cell 100 reaches a threshold, the pressure relief mechanism 30 can open and release the internal pressure of the battery cell 100, thereby improving the safety performance of the battery cell 100.

[0155] like Figure 1 As shown, in some embodiments of this application, there are multiple pressure relief mechanisms 30, which are commonly located at one end of the width direction of the housing 10, and are spaced apart along the length direction of the housing 10.

[0156] By setting multiple pressure relief mechanisms 30 and arranging them at intervals along the length of the housing 10 at one end of the width direction of the housing 10, when the internal pressure or temperature of the battery cell 100 reaches a threshold, one or more of the multiple pressure relief mechanisms 30 can open and release the internal pressure of the battery cell 100, thereby improving the safety performance of the battery cell 100.

[0157] like Figure 1 As shown, in some embodiments of this application, the battery cell 100 further includes a sampling chip 40. The sampling chip 40 may be disposed at one end of the length direction or one end of the width direction of the housing 10 and electrically connected to the controller for collecting the status of the battery cell 100, including power, temperature or other data.

[0158] Combining 6 and Figure 7As shown, in a second aspect, this application proposes an energy storage device, which includes a housing 200 and at least one battery cluster 300. The battery cluster 300 is disposed in a receiving cavity and includes a plurality of battery modules 310 connected in series. Each battery module 310 includes a plurality of battery cells 100, which are arranged vertically. The battery cells 100 are battery cells 100 as described in any of the above embodiments.

[0159] Specifically, the energy storage device can be an energy storage container 1000, with battery cells 100 located inside the energy storage container 1000 and used to provide power to the energy storage container 1000.

[0160] Since the energy storage device of this application has the battery cell 100 in any of the above embodiments, it can achieve the same technical effect as the battery cell 100 in any of the above embodiments, and will not be described in detail here.

[0161] Combination Figure 1 , Figure 6 and Figure 7 As shown, in some embodiments of this application, the receiving cavity is provided with an insertion interface on one side along the horizontal direction, and the battery module 310 is inserted into the receiving cavity through the insertion interface. The length and width directions of the outer shell 10 extend horizontally, the height direction of the outer shell 10 extends vertically, and the length direction of the outer shell 10 is consistent with the insertion direction.

[0162] Specifically, the receiving cavity includes length, width, and height directions. The length direction of the receiving cavity is the same as the length direction of the housing 200, the width direction is the same as the width direction of the housing 200, and the height direction is the same as the height direction of the housing 200. The length direction A and width direction B of the receiving cavity extend horizontally, and the height direction C extends vertically. An insertion interface is formed on the side where the length direction A and height direction C of the receiving cavity are located. The battery module 310 is inserted into the interior of the housing 200 along the width direction B of the receiving cavity. The length direction X of the battery body and the width direction Y of the outer casing extend horizontally, and the height direction Z of the outer casing extends vertically. The length direction X of the outer casing is consistent with the width direction B of the receiving cavity.

[0163] Optionally, the container 200 is a 20-foot high cube container with an internal cavity width of 2438mm. In this application, the length direction X of the outer shell is consistent with the width direction B of the cavity, and the length L of the outer shell 10 is set within the range of 2000mm≤L≤2300mm. Therefore, the length of the outer shell 10 is smaller than the width of the cavity. Along the width direction B of the cavity, only one battery cell 100 needs to be installed in the container 200 to make full use of the space in the width direction of the container 200, effectively reducing the number of battery cells 100 installed along the width direction B of the cavity, thereby facilitating the assembly of the battery cells 100 in the container 200.

[0164] By setting the length direction of the outer casing 10 to be consistent with the insertion direction, the number of battery cells 100 arranged along the insertion direction can be reduced, thereby facilitating the assembly of battery cells 100 within the housing 200.

[0165] Combination Figures 6 to 8 As shown, in some embodiments of this application, the interior of the housing 200 is provided with multiple partitions 700 spaced along its length. These partitions 700 divide the interior of the housing 200 into multiple cavities, and each cavity contains a battery cluster 300. Optionally, each battery cluster 300 includes an even number of battery modules 310 arranged along the length A of the housing, facilitating wiring between the even number of battery modules 310 within the same cavity. Optionally, two battery modules 310 can be disposed within the same cavity. Each battery module 310 includes multiple battery cells 100 stacked and connected vertically. Adjacent battery cells 100 are bonded together by a first wall 11. The first electrode terminal 21 of one of the adjacent battery cells 100 and the second electrode terminal 22 of the other battery cell 100 are located on the same side of the width direction of the outer casing 10 and connected by a conductive sheet 320, thereby connecting the multiple battery cells 100 in the same battery module 310 in series.

[0166] A battery module 310 is formed by stacking and connecting multiple battery cells 100 in a vertical direction. This means that the number of battery cells 100 can be increased within a unit size range in the vertical direction, thereby increasing the capacity of the battery module 310. Alternatively, the vertical dimension of the battery module 310 can be reduced while maintaining the same capacity.

[0167] Combination Figures 6 to 8 As shown, in some embodiments of this application, the energy storage device further includes at least one tray 400, which is fixedly connected to the housing 200, and the battery module 310 is disposed above the tray 400 and fixedly connected to the tray 400.

[0168] Specifically, the tray 400 is located in the receiving cavity inside the housing 200. Multiple battery cells in the battery module 310 can be stacked and bonded together by their large surfaces, and the first electrode terminals 21 and second electrode terminals 22 of adjacent battery cells 100 are connected by conductive sheets 320, thereby forming the battery module 310. The battery module 310 has no frame structure. The battery cell 100 located at the bottom vertically in the battery module 310 is directly connected to the tray 400. Optionally, the battery cell 100 can be bonded to the tray 400 to form a whole and be assembled into the receiving cavity.

[0169] In some embodiments of this application, to improve the installation stability of the battery module 310, the energy storage device further includes a bracket 500. The bracket 500 is disposed in the receiving cavity and connected to the inner wall of the receiving cavity. Specifically, it can be connected to the bottom wall. The trays 400 corresponding to two adjacent battery modules 310 are connected by the bracket 500, thereby improving the installation stability of the trays 400 and the battery modules 310. In some embodiments of this application, a fixing plate 600 can also be provided above multiple battery modules 310 in the same battery cluster 300, and the tops of the multiple battery modules 310 are respectively connected to the fixing plate 600, thereby improving the fixing effect of the battery modules 310 in the receiving cavity. Optionally, the top of the battery module 310 can be glued to the fixing plate 600.

[0170] By connecting the battery module to the tray 400, the battery module 310 can be fixed inside the housing 200 without the need for a frame structure to assemble multiple battery cells 100 into the battery module 310. This reduces the space occupied by the frame structure in the housing 200 and improves the space utilization rate of the battery cells 100 in the housing 200.

[0171] In some embodiments of this application, the energy storage container 1000 is a 20-foot container, which can be a GBT1413-2023 series 1 container. The width of the container body 200 is 2438 mm. The length of the container body 200 is 6100 mm. The height of the container body 200 can be 2896 mm or 2591 mm. When the height of the container body 200 is 2896 mm, its container type is 1CCC. When the height of the container body 200 is 2591 mm, its container type is 1CC.

[0172] Based on the internal space layout of a 20-foot container, taking a lithium iron phosphate battery cell as an example, the dimensions of the battery cell 100 are set according to Table (I) below, which can maximize the space utilization of the internal cavity of the container 200. Here, the charge E' represents the charge of the battery cell 100.

[0173]

[0174]

[0175] Table (1)

[0176] Combination Figure 1 and Figure 8 As shown, in some embodiments of this application, the battery module 310 further includes a heat exchange plate 330. The heat exchange plate 330 is attached to one side of the housing 10 in the width direction and is respectively attached to a plurality of housings 10 arranged sequentially in the vertical direction.

[0177] Specifically, the heat exchange plate 330 is a generally flat plate structure and is attached to one side surface of the housing 10 in the width direction. The heat exchange plate 330 can be used to exchange heat with the battery cell 100, thereby regulating the temperature of the battery cell 100.

[0178] 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.

[0179] Combination Figures 6 to 8 As shown, in some embodiments of this application, the energy storage container 1000 includes a container body 200 and multiple battery clusters 300. The container body 200 has an internal cavity, and the multiple battery clusters 300 are arranged horizontally within the cavity. Each battery cluster 300 includes multiple battery modules 310 connected in series, and each battery module 310 includes multiple individual battery cells 100 arranged vertically. An insertion interface is provided on one side of the cavity along the horizontal direction, through which the battery modules 310 are inserted into the cavity. The energy storage container 1000 also includes a pallet 400, which is fixedly connected to the container body 200. The battery modules 310 are positioned above the pallet 400 and fixedly connected to it. Each individual battery cell 100 includes a housing 10, an electrode assembly, and electrode terminals. The electrode assembly is located within the housing 10 and has tabs, while the electrode terminals are located on the housing 10 and electrically connected to the tabs. The outer casing 10 has a length dimension L, a width dimension W, and a height dimension H, wherein H < W ≤ L. The length and width directions of the outer casing 10 extend horizontally, and the height direction of the outer casing 10 extends vertically. The length direction of the outer casing 10 is consistent with the direction in which it is inserted into the receiving cavity.

[0180] Combination Figure 1 , Figure 6 and Figure 7As shown, the outer casing 10 has a length dimension L, a width dimension W, and a height dimension H, wherein H < W ≤ L, 2000 mm ≤ L ≤ 2300 mm, 7 mm ≤ H ≤ 30 mm, 1.5 ≤ L / W ≤ 2.7, and 210 ≤ L / H ≤ 320. The outer casing 10 also has a volume dimension V, where V = L * W * H, 0.000014 / mm. 2 ≤L / V≤0.000265 / mm 2 0.00000019 / mm 2 ≤H / V≤0.00000093 / mm 2 0.000014 / mm 2 ≤W / V≤0.000071 / mm 2 The outer casing 10 has a surface area dimension S, where S = 2L*W + 2L*H + 2W*H, and 0.067 / mm² ≤ S / V ≤ 0.286 / mm². The battery cell 100 has a capacity E, where 0.1212mm² / Ah ≤ L / E ≤ 1.74mm² / Ah, and a thickness of 130.9mm². 2 / Ah≤S / E≤3680mm 2 / Ah, 3024mm 3 / Ah≤V / E≤55200mm 3 / Ah.

[0181] like Figure 1 As shown, the outer casing 10 is a prismatic casing made of metal. The battery cell 100 also includes a first electrode terminal 21 and a second electrode terminal 22, with opposite polarities. The first electrode terminal 21 and the second electrode terminal 22 are respectively located at opposite ends of the width direction of the outer casing 10. The battery cell 100 also includes multiple pressure relief mechanisms 30, configured to release the internal pressure of the outer casing 10 when the internal pressure or temperature reaches a threshold. Multiple pressure relief mechanisms 30 are shared at one end of the width direction of the outer casing 10 and are spaced apart along the length direction of the outer casing 10.

[0182] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing has an internal cavity; An electrode assembly is disposed within the cavity and is provided with electrode tabs; and Electrode terminals are disposed on the housing and electrically connected to the electrode tabs; The outer casing has a length dimension L, a width dimension W, and a height dimension H, wherein H < W ≤ L, and 600mm ≤ L ≤ 2400mm, L / W is less than or equal to 3.7, and 70 ≤ L / H ≤ 320. The outer casing has a volume dimension V, and the battery cell has a capacity E, wherein V = L * W * H, 3024mm 3 / Ah≤V / E≤55200mm 3 / Ah.

2. The battery cell according to claim 1, characterized in that, 1.5≤L / W≤2.

7.

3. The battery cell according to claim 1, characterized in that, 7mm≤H≤30mm.

4. The battery cell according to claim 1, characterized in that, 2000mm≤L≤2300mm.

5. The battery cell according to claim 1, characterized in that, 210≤L / H≤320.

6. The battery cell according to claim 1, characterized in that, The outer shell has a volume dimension V, where V = L * W * H, and 0.000014 / mm². 2 ≤L / V≤0.000265 / mm 2 .

7. The battery cell according to claim 1, characterized in that, The outer shell has a volume dimension V, where V = L * W * H, and 0.00000019 / mm. 2 ≤H / V≤0.00000093 / mm 2 .

8. The battery cell according to claim 1, characterized in that, The outer shell has a volume dimension V, where V = L * W * H, and 0.000014 / mm². 2 ≤W / V≤0.000071 / mm 2 .

9. The battery cell according to claim 1, characterized in that, The outer shell has a surface area dimension S and a volume dimension V, where S = 2L*W + 2L*H + 2W*H, V = L*W*H, and 0.067 / mm ≤ S / V ≤ 0.286 / mm.

10. The battery cell according to claim 1, characterized in that, The battery cell has a capacity E, wherein 0.1212 mm / Ah ≤ L / E ≤ 1.74 mm / Ah.

11. The battery cell according to claim 10, characterized in that, 0.1212mm / Ah≤L / E≤0.8mm / Ah.

12. The battery cell according to claim 1, characterized in that, The outer casing has a surface area dimension S, and the battery cell has a capacity E, where S = 2L*W + 2L*H + 2W*H, 130.9mm² 2 / Ah≤S / E≤3680mm 2 / Ah.

13. The battery cell according to any one of claims 1 to 12, characterized in that, The outer shell is a prismatic shell made of metal.

14. The battery cell according to any one of claims 1 to 12, characterized in that, The electrode terminal includes a first electrode terminal and a second electrode terminal, the first electrode terminal and the second electrode terminal having opposite polarities, the first electrode terminal and the second electrode terminal being respectively located at both ends of the length direction of the housing, or the first electrode terminal and the second electrode terminal being respectively located at both ends of the width direction of the housing.

15. The battery cell according to any one of claims 1 to 12, characterized in that, The battery cell further includes multiple first electrode terminals and multiple second electrode terminals, wherein the polarities of the first electrode terminals and the second electrode terminals are opposite. A plurality of first electrode terminals are commonly disposed at one end of the housing in the width direction and are spaced apart along the length direction of the housing; a plurality of second electrode terminals are commonly disposed at the other end of the housing in the width direction and are spaced apart along the length direction of the housing. Alternatively, a plurality of first electrode terminals are respectively disposed at both ends of the width direction of the housing, and a plurality of second electrode terminals are respectively disposed at both ends of the width direction of the housing, and the first electrode terminals and second electrode terminals located at the same end are spaced apart along the length direction of the housing, and the first electrode terminals and second electrode terminals located at both ends are arranged opposite to each other along the width direction of the housing.

16. The battery cell according to any one of claims 1 to 12, characterized in that, The battery cell also includes at least one pressure relief mechanism, and the pressure relief mechanism is provided at least one end of the housing in the width or length direction.

17. The battery cell according to claim 16, characterized in that, The number of pressure relief mechanisms is multiple, and the multiple pressure relief mechanisms are located at one end of the width direction of the outer shell, and the multiple pressure relief mechanisms are spaced apart along the length direction of the outer shell.

18. An energy storage device, characterized in that, include: The box has an internal cavity for receiving; At least one battery cluster disposed in the receiving cavity, the battery cluster comprising a plurality of battery modules connected in series, the battery modules comprising a plurality of battery cells arranged in a vertical direction, wherein the battery cells are battery cells according to any one of claims 1 to 17.

19. The energy storage device according to claim 18, characterized in that, The receiving cavity is provided with an insertion interface on one side along the horizontal direction. The battery module is inserted into the receiving cavity through the insertion interface. The length and width directions of the outer shell extend horizontally, the height direction of the outer shell extends vertically, and the length direction of the outer shell is consistent with the insertion direction.

20. The energy storage device according to claim 18, characterized in that, The energy storage device also includes a tray, which is fixedly connected to the housing, and the battery module is located above the tray and fixedly connected to the tray.

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