Battery cell and energy storage device

Abstract

The present application relates to the technical field of batteries, and specifically relates to a battery cell and an energy storage device. The battery cell of the present application comprises a casing, an electrode assembly and electrode terminals, wherein a cavity is provided inside the casing; the electrode assembly is arranged inside the cavity and is provided with tabs; the electrode terminals are arranged on the casing and are electrically connected to the tabs; and the casing has a length dimension L, a width dimension W and a height dimension H, where H<W≤L, 600 mm≤L≤2400 mm, and L / W is less than or equal to 3.7. According to the battery cell of the present application, by means of setting the length dimension L of the casing to 600 mm≤L≤2400 mm and setting L / W to less than or equal to 3.7, the length dimension and width dimension of the casing can be increased, thereby increasing the the dimensions of the electrode assembly in the casing, and further improving the space utilization rate and energy storage effect of the battery cell.

Description

Battery cell and energy storage device

[0001] Cross-reference to Related Applications

[0002] This application claims priority to and the benefit of the following patent applications, the entire contents of which are incorporated herein by reference:

[0003] Chinese Patent Application No. 202411116735.0, filed on August 14, 2024, entitled “Battery cell and energy storage device” with the Chinese Patent Office. TECHNICAL FIELD

[0004] The present application relates to the technical field of batteries, in particular to a battery cell and an energy storage device. BACKGROUND

[0005] At present, with the continuous growth of global energy demand and the improvement of environmental protection awareness, energy storage technology has gradually become one of the important means to solve energy problems.

[0006] As a new type of energy storage device, energy storage container has the advantages of portability, flexibility, high efficiency, etc., and is widely used in power systems, transportation, aerospace, etc. As the core component of the energy storage container, the performance of the battery cell directly affects the use efficiency and economy of the energy storage container.

[0007] In related technologies, due to the internal resistance and overcurrent limitation of the battery cell, the size of the battery cell cannot be designed too large, thereby reducing the space utilization of the battery cell and further reducing the energy storage effect of the battery cell. SUMMARY

[0008] In view of the defects in the prior art, the purpose of the present application is to provide a battery cell and an energy storage device which can effectively solve the problem of low space utilization of the battery cell. The purpose is achieved in the following way:

[0009] In a first aspect, the present application provides a battery cell, comprising:

[0010] a shell, the inside of the shell being provided with a cavity;

[0011] an electrode assembly provided in the cavity and provided with a tab; and

[0012] an electrode terminal provided on the shell and electrically connected with the tab;

[0013] The shell 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.

[0014] According to the battery cell of the present application, by setting the length dimension L of the shell to 600mm≤L≤2400mm and L / W to less than or equal to 3.7, the length dimension and width dimension of the shell can be increased, thereby increasing the size of the electrode assembly in the shell, and further improving the space utilization and energy storage effect of the battery cell.

[0015] Meanwhile, since the length dimension and width dimension of the shell are increased, the surface area of the shell is also increased, and thus the heat dissipation effect of the battery cell can be improved.

[0016] In some embodiments of the present application, 1.5≤L / W≤2.7.

[0017] By setting 1.5≤L / W≤2.7, the width dimension of the shell can be increased, thereby increasing the size of the electrode assembly in the shell, and further improving the space utilization and energy storage effect of the battery cell.

[0018] In some embodiments of the present application, 5mm≤H≤30mm.

[0019] By setting the height dimension H of the shell to 5mm≤H≤30mm, the height dimension of the shell can be reduced without exceeding the overcurrent limit of the battery cell, thereby increasing the length dimension and width dimension of the shell, and further improving the heat dissipation effect of the battery cell.

[0020] In some embodiments of the present application, 2000mm≤L≤2300mm.

[0021] By setting the length dimension L of the shell to 2000mm≤L≤2300mm, the length dimension of the shell can be increased, thereby increasing the size of the electrode assembly in the shell, and further improving the space utilization and energy storage effect of the battery cell.

[0022] In some embodiments of the present application, 70≤L / H≤320.

[0023] By setting the length dimension and height dimension of the shell according to the above ratio, the length dimension of the shell can be increased without exceeding the overcurrent limit of the battery cell, and further improving the heat dissipation effect of the battery cell.

[0024] In some embodiments of the present application, 210≤L / H≤320.

[0025] By setting the length dimension and height dimension of the battery body according to the above ratio, the length dimension of the shell can be increased without exceeding the overcurrent limit of the battery cell, and further improving the heat dissipation effect of the battery cell.

[0026] In some embodiments of the present application, the shell has a volume dimension V, where V=L*W*H, and 0.000014 / mm2 ≤ L / V ≤ 0.000265 / mm 2 .

[0027] By setting the length dimension and the volume dimension of the shell according to the above ratio, the length dimension of the shell can be improved, and the space utilization of the battery monomer can be improved.

[0028] In some embodiments of the present application, the shell has a volume dimension V, wherein V=L*W*H, and 0.00000019 / mm 2 ≤ H / V ≤ 0.00000093 / mm 2 .

[0029] By setting the height dimension and the volume dimension of the shell according to the above ratio, the height dimension of the shell can be reduced without exceeding the overcurrent limit of the battery monomer, so as to improve the length dimension and the width dimension of the shell, and the heat dissipation effect of the battery monomer can be improved.

[0030] In some embodiments of the present application, the shell has a volume dimension V, wherein V=L*W*H, and 0.000014 / mm 2 ≤ W / V ≤ 0.000071 / mm 2 .

[0031] By setting the width dimension and the volume dimension of the shell according to the above ratio, the width dimension of the shell can be improved, and the heat dissipation effect of the battery monomer can be improved.

[0032] In some embodiments of the present application, the shell has a surface area dimension S, and the shell has 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.

[0033] By setting 0.067 / mm≤S / V≤0.286 / mm, the surface area of the shell can be improved, and the heat dissipation effect of the battery monomer can be improved.

[0034] In some embodiments of the present application, the battery monomer has a capacity E, wherein 0.1212mm / Ah≤L / E≤1.74mm / Ah.

[0035] When the battery monomers with different length dimensions have the same capacity E, the smaller the ratio of L / E is, the greater the capacity value in the unit length dimension range is, and the greater the capacity density is. By setting the length dimension of the shell and the capacity E of the battery monomer according to the above ratio, the capacity density of the battery monomer in the unit length dimension can be effectively improved.

[0036] In some embodiments of the present application, 0.1212 mm / Ah ≤ L / E ≤ 0.8 mm / Ah.

[0037] The length dimension of the shell and the capacity E of the battery cell are set in the above ratio, which can improve the capacity density of the battery cell in the unit length dimension.

[0038] In some embodiments of the present application, the shell has a surface area dimension S, and the battery cell has a capacity E, wherein S = 2L*W + 2L*H + 2W*H, 130.9 mm 2 / Ah ≤ S / E ≤ 3680 mm 2 / Ah.

[0039] By setting 130.9 mm 2 / Ah ≤ S / E ≤ 3680 mm 2 / Ah, the capacity density of the battery cell in the unit area can be improved.

[0040] In some embodiments of the present application, the shell has a volume dimension V, and the battery cell has a capacity E, wherein V = L*W*H, 3024 mm 3 / Ah ≤ V / E ≤ 55200 mm 3 / Ah.

[0041] By setting 3024 mm 3 / Ah ≤ V / E ≤ 55200 mm 3 / Ah, the capacity density of the battery cell in the unit volume can be improved.

[0042] In some embodiments of the present application, the shell is a prismatic shell made of metal material.

[0043] The shell is set as a prismatic shell made of metal material, which can effectively increase the surface area of the battery cell and improve the heat dissipation capacity of the battery cell.

[0044] In some embodiments of the present application, the electrode terminal includes a first electrode terminal and a second electrode terminal, the polarities of the first electrode terminal and the second electrode terminal are opposite, and the first electrode terminal and the second electrode terminal are respectively arranged at two ends of the length direction of the shell, or the first electrode terminal and the second electrode terminal are respectively arranged at two ends of the width direction of the shell.

[0045] The first electrode terminal and the second electrode terminal can be reasonably selected in the setting position on the shell according to the wiring requirement, so as to facilitate the connection of the first electrode terminal and the second electrode terminal with the external wiring respectively.

[0046] In some embodiments of the present application, the battery cell further comprises a plurality of first electrode terminals and a plurality of second electrode terminals, the first electrode terminals and the second electrode terminals being opposite in polarity, wherein,

[0047] The plurality of first electrode terminals are arranged at one end of the width direction of the shell and are arranged at intervals along the length direction of the shell, and the plurality of second electrode terminals are arranged at the other end of the width direction of the shell and are arranged at intervals along the length direction of the shell.

[0048] Alternatively, the plurality of first electrode terminals are arranged at both ends of the width direction of the shell, and the plurality of second electrode terminals are arranged at both ends of the width direction of the shell, and the first electrode terminals and the second electrode terminals at the same end are arranged at intervals along the length direction of the shell, and the first electrode terminals and the second electrode terminals at both ends are arranged opposite to each other along the width direction of the shell.

[0049] The plurality of first electrode terminals and the plurality of second electrode terminals can be reasonably selected in the setting position on the shell according to the wiring requirement, so as to facilitate the connection of the first electrode terminals and the second electrode terminals with the external wiring respectively.

[0050] In some embodiments of the present application, the battery cell further comprises at least one pressure relief mechanism, at least one end of the width direction or the length direction of the shell is provided with the pressure relief mechanism.

[0051] By arranging the pressure relief mechanism on the shell, when the internal pressure or temperature of the battery cell reaches the threshold value, the pressure relief mechanism can be opened and the internal pressure of the battery cell can be released, thereby improving the safety performance of the battery cell.

[0052] In some embodiments of the present application, the number of pressure relief mechanisms is multiple, and the plurality of pressure relief mechanisms are arranged at one end of the width direction of the shell and are arranged at intervals along the length direction of the shell.

[0053] By arranging multiple pressure relief mechanisms and arranging the multiple pressure relief mechanisms at one end of the width direction of the shell along the length direction of the shell, when the internal pressure or temperature of the battery cell reaches the threshold value, one or several of the multiple pressure relief mechanisms can be opened and the internal pressure of the battery cell can be released, thereby improving the safety performance of the battery cell.

[0054] In a second aspect, the present application provides an energy storage device, which comprises:

[0055] A box body, an accommodating cavity is formed in the interior of the box body;

[0056] At least one battery cluster, the battery cluster is arranged in the accommodating cavity, the battery cluster comprises a plurality of battery modules connected in series, the battery module comprises a plurality of battery cells arranged in a vertical direction, wherein the battery cell is any one of the battery cells described above.

[0057] In some embodiments of the present application, one side of the accommodating cavity along the horizontal direction is provided with a plug-in interface, and the battery module is plugged into the accommodating cavity through the plug-in interface, wherein the length direction and the width direction of the shell extend along the horizontal direction respectively, the height direction of the shell extends along the vertical direction, and the length direction of the shell is consistent with the plug-in direction.

[0058] By setting the length direction of the shell to be consistent with the plug-in direction, the number of battery monomers arranged along the plug-in direction can be reduced, thereby facilitating the assembly of the battery monomers in the box.

[0059] In some embodiments of the present application, the energy storage device further comprises a tray, the tray is fixedly connected with the box, and the battery module is arranged above the tray and is fixedly connected with the tray.

[0060] By fixedly connecting the battery module with the tray, the battery module can be fixed in the interior of the box, and a frame structure for assembling a plurality of battery monomers into a battery module is not required, thereby reducing the occupied space of the frame structure in the box, and thereby improving the space occupancy rate of the battery monomers in the box.

[0061] The above description is only a summary of the technical solutions of the present application, in order to enable the technical means of the present application to be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0062] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the attached drawings indicate the same or similar components. In the drawings:

[0063] FIG. 1 is an axial side view of a battery monomer according to some embodiments of the present application;

[0064] FIG. 2 is a top view of a battery monomer according to some embodiments of the present application;

[0065] FIG. 3 is a top view of a battery monomer according to some other embodiments of the present application;

[0066] FIG. 4 is a top view of a battery monomer according to some other embodiments of the present application;

[0067] FIG. 5 is a top view of a battery monomer according to some other embodiments of the present application;

[0068] FIG. 6 is a front view of the distribution of battery monomers in an energy storage device according to some embodiments of the present application;

[0069] FIG. 7 is a top view of distribution of battery cells in an energy storage device according to some embodiments of the present application;

[0070] FIG. 8 is a structural schematic diagram of a battery module in an energy storage device according to some embodiments of the present application.

[0071] In the drawings, various labels have been used to represent the same elements in different drawings. 100, battery cell; 10, shell; 11, first wall; 21, first electrode terminal; 22, second electrode terminal; 30, pressure relief mechanism; 40, sampling chip; 200, box; 300, battery cluster; 310, battery module; 320, conductive sheet; 330, heat exchange plate; 400, tray; 500, support; 600, fixed plate; 700, partition plate; 1000, energy storage container; X, length direction of the shell; Y, width direction of the shell; Z, height direction of the shell; A, length direction of the accommodation cavity; B, width direction of the accommodation cavity; C, height direction of the accommodation cavity. DETAILED DESCRIPTION

[0072] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0073] 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 belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "include" and "have" and any variations thereof used in the specification and the claims and the above description of drawings are intended to cover the inclusion not the exclusion of one or more elements.

[0074] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0075] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0076] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are an "or" relationship.

[0077] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0078] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0079] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0080] As a new type of energy storage device, the energy storage container has the advantages of portability, flexibility, high efficiency, etc., and is widely used in power systems, transportation, aerospace, etc. As the core component of the energy storage container, the performance of the battery monomer directly affects the efficiency and economy of the energy storage container.

[0081] In the related art, due to the internal resistance and overcurrent limitation of the battery monomer, the size of the battery monomer cannot be designed too large, thereby reducing the space utilization of the battery monomer and further reducing the energy storage effect of the battery monomer.

[0082] To solve the problem of low space utilization of the battery monomer, the application provides a battery monomer and an energy storage device with the battery monomer. The battery monomer can increase the length and width of the shell, thereby increasing the size of the electrode assembly in the shell, and further improving the space utilization and energy storage effect of the battery monomer.

[0083] The battery monomer in the application is not only suitable for energy storage devices, but also can be applied to various electric equipment using batteries, such as notebook computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, the spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc. The battery is used to provide electric energy for the above-mentioned electric equipment.

[0084] However, for the sake of simplicity, the following embodiments are described by taking the battery monomer used in the energy storage device as an example.

[0085] In some embodiments of the application, the energy storage device can include a cabinet and one or more battery clusters. The battery cluster is contained in the cabinet.

[0086] The battery cluster can include a plurality of battery modules. The plurality of battery modules are connected in series through the busbar component to increase the voltage of the energy storage device. When the energy storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0087] The energy storage device can be used in energy storage power stations, wind power systems, solar power systems, mobile power systems or temporary power supply systems, etc. The energy storage device can store electric energy as needed and output electric energy at appropriate times. For example, the energy storage device can store electric energy during the low electricity consumption period, and provide electric energy for related users or electric equipment during the electricity consumption peak period. The energy storage system provided by the embodiments of the application can be any power system that needs to use the energy storage device.

[0088] In some embodiments of the application, the energy storage device is an energy storage container or an energy storage cabinet.

[0089] In combination with FIGS. 1 and 2, in some embodiments of the application, the battery monomer 100 includes a shell 10, an electrode assembly (not shown in the figure) and an electrode terminal. The shell 10 has an internal cavity, the electrode assembly is arranged in the cavity and is provided with a tab (not shown in the figure), and the electrode terminal is arranged on the shell 10 and is electrically connected with the tab. The shell 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.

[0090] Specifically, the shell 10 forms the overall appearance structure of the battery monomer 100, and an electrode assembly is formed inside the shell 10, and the electrode terminal protrudes outside the shell 10. The shell 10 can be a heat-conducting member formed of a metal material, which has good heat conduction performance and sufficient structural strength, so that the shell 10 is not easily deformed when subjected to extrusion and collision, thereby improving the safety performance of the shell 10. Alternatively, the material of the shell 10 can be steel, iron, aluminum, aluminum alloy, etc. The shell 10 can be a strip-shaped structure or a block-shaped structure, and has a length dimension L, a width dimension W, and a height dimension H, where H < W ≤ L.

[0091] The inside of the shell 10 forms an electrode assembly, which is a component that undergoes an electrochemical reaction in the battery monomer 100. The inside of the shell 10 can contain one or more electrode assemblies. The electrode assembly is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body of the electrode assembly, and a portion without active material constituting a tab (not shown in the figure) respectively. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body respectively. In the charging and discharging process of the battery monomer 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminal to form a current loop.

[0092] Wherein, L can be any value between 600mm...1000mm...1800mm...2400mm. The ratio of L / W can be any value between 1...1.5...2...2.5...3...3.7. When L / W = 1, the length dimension of the shell 10 is equal to the width dimension, at this time the shell 10 is a square structure. When L / W > 1, the length dimension of the shell 10 is greater than the width dimension, at this time the shell 10 is a strip-shaped structure.

[0093] According to the battery monomer 100 of the present application, by setting the length dimension L of the shell 10 to 600mm ≤ L ≤ 2400mm and setting L / W to be less than or equal to 3.7, the length dimension and the width dimension of the shell 10 can be improved, thereby improving the size of the electrode assembly inside the shell 10, and further improving the space utilization and energy storage effect of the battery monomer 100.

[0094] At the same time, since the length dimension and the width dimension of the shell 10 are improved, the surface area of the shell 10 is increased, so the heat dissipation effect of the battery monomer 100 can also be improved. Specifically, in combination with FIG. 1 and FIG. 2, in some embodiments of the present application, 1.5 ≤ L / W ≤ 2.7.

[0095] Specifically, the ratio of L / W can be any value between 1.5...2...2.5...2.7.

[0096] Setting 1.5≤L / W≤2.7 can increase the width dimension of the shell 10, thereby increasing the size of the electrode assembly in the shell 10, and further improving the space utilization and energy storage effect of the battery monomer 100.

[0097] In some embodiments of the present application, 5mm≤H≤30mm

[0098] Specifically, H can be any value between 5mm…10mm…15mm…20mm…30mm.

[0099] Setting the height dimension H of the shell 10 to 5mm≤H≤30mm can reduce the height dimension of the shell 10 without exceeding the overcurrent limit of the battery monomer 100, thereby increasing the length and width dimensions of the shell 10, and further improving the heat dissipation effect of the battery monomer 100.

[0100] In some embodiments of the present application, 2000mm≤L≤2300mm.

[0101] Specifically, L can be any value between 2000mm…2100mm…2200mm…2300mm.

[0102] Setting the length dimension L of the shell 10 to 2000mm≤L≤2300mm can increase the length dimension of the shell 10, thereby increasing the size of the electrode assembly in the shell 10, and further improving the space utilization and energy storage effect of the battery monomer 100.

[0103] In some embodiments of the present application, 70≤L / H≤320.

[0104] Specifically, the ratio of L / H can be any value between 70…100…150…200…300…320.

[0105] By setting the length and height dimensions of the shell 10 according to the above ratio, the length dimension of the shell 10 can be increased without exceeding the overcurrent limit of the battery monomer 100, thereby improving the heat dissipation effect of the battery monomer 100.

[0106] In some embodiments of the present application, 210≤L / H≤320.

[0107] Specifically, the ratio of L / H can be any value between 210…250…300…320.

[0108] By setting the length dimension and the height dimension of the shell 10 according to the above ratio, the length dimension of the shell 10 can be increased without exceeding the overcurrent limit of the battery monomer 100, and thus the heat dissipation effect of the battery monomer 100 is improved.

[0109] In some embodiments of the present application, the shell 10 has a volume dimension V, where V=L*W*H, and 0.000014 / mm 2 ≤L / V≤0.000265 / mm 2 .

[0110] Specifically, the shell 10 has a strip structure or a block structure, and the volume dimension V=L*W*H. The ratio of L / V can be any value between 0.000014 / mm 2 ...0.0001 / mm 2 ...0.0002 / mm 2 ...0.000265 / mm 2 .

[0111] By setting the length dimension and the volume dimension of the shell 10 according to the above ratio, the length dimension of the shell 10 can be increased without exceeding the overcurrent limit of the battery monomer 100, and thus the space utilization of the battery monomer 100 is improved.

[0112] In some embodiments of the present application, the shell 10 has a volume dimension V, where V=L*W*H, and 0.00000019 / mm 2 ≤H / V≤0.00000093 / mm 2 .

[0113] Specifically, the ratio of H / V can be any value between 0.00000019 / mm 2 ...0.00000050 / mm 2 ...0.00000093 / mm 2 ...0.00000093 / mm 2 .

[0114] By setting the height dimension and the volume dimension of the shell 10 according to the above ratio, the height dimension of the shell 10 can be reduced without exceeding the overcurrent limit of the battery monomer 100, and thus the length dimension and the width dimension of the shell 10 are increased, and the heat dissipation effect of the battery monomer 100 is improved.

[0115] In some embodiments of the present application, the shell 10 has a volume dimension V, where V=L*W*H, and 0.000014 / mm 2≤ W / V ≤ 0.000071 / mm 2 .

[0116] Specifically, the ratio of W / V can be any value between 0.000014 / mm 2 ... 0.000035 / mm 2 ... 0.000058 / mm 2 ... 0.000071 / mm 2 .

[0117] By setting the width dimension and volume dimension of the shell 10 according to the above ratio, the width dimension of the shell 10 can be increased without exceeding the overcurrent limit of the battery monomer 100, thereby improving the heat dissipation effect of the battery monomer 100.

[0118] In combination with FIGS. 1 and 2, in some embodiments of the present application, the shell 10 has a surface area dimension S, and the shell 10 has 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.

[0119] Specifically, the surface area of the shell 10 refers to the sum of the areas of all outer surfaces of the shell 10. The ratio of S / V can be any value between 0.067 / mm... 0.15 / mm... 0.222 / mm... 0.286 / mm.

[0120] By setting 0.067 / mm ≤ S / V ≤ 0.286 / mm, the surface area of the shell 10 can be increased, thereby improving the heat dissipation effect of the battery monomer 100.

[0121] In combination with FIGS. 1 and 2, in some embodiments of the present application, the battery monomer 100 has a capacity E, wherein 0.1212mm / Ah ≤ L / E ≤ 1.74mm / Ah.

[0122] Specifically, the ratio of L / E can be any value between 0.1212mm / Ah... 1.2mm / Ah... 1.5mm / Ah... 1.74mm / Ah.

[0123] When battery monomers 100 of different length dimensions have the same capacity E, the smaller the ratio of L / E, the greater the capacity value per unit length dimension range, and the greater the capacity density. By setting the length dimension of the shell 10 and the capacity E of the battery monomer 100 according to the above ratio, the capacity density of the battery monomer 100 per unit length dimension can be effectively improved.

[0124] In combination with FIGS. 1 and 2, in some embodiments of the present application, 0.1212mm / Ah ≤ L / E ≤ 0.8mm / Ah.

[0125] Specifically, the ratio of L / E can be any value between 0.1212 mm / Ah...0.50 mm / Ah...0.75 mm / Ah...0.8 mm / Ah.

[0126] The length dimension of the shell 10 and the capacity E of the battery cell 100 are set in the above ratio, which can improve the capacity density in the unit length dimension of the battery cell 100.

[0127] In combination with FIGS. 1 and 2, in some embodiments of the present application, the shell 10 has a surface area dimension S, and the battery cell has a capacity E, wherein S = 2L*W + 2L*H + 2W*H, 130.9 mm 2 / Ah≤S / E≤3680 mm 2 / Ah.

[0128] Specifically, the ratio of S / E can be any value between 130.9 mm 2 / Ah...1000 mm 2 / Ah...2400 mm 2 / Ah...3680 mm 2 / Ah.

[0129] By setting 130.9 mm 2 / Ah≤S / E≤3680 mm 2 / Ah, the capacity density in the unit area of the battery cell 100 can be improved.

[0130] In combination with FIGS. 1 and 2, in some embodiments of the present application, the shell 10 has a volume dimension V, and the battery cell 100 has a capacity E, wherein V = L*W*H, 3024 mm 3 / Ah≤V / E≤55200 mm 3 / Ah.

[0131] Specifically, the ratio of V / E can be any value between 3024 mm 3 / Ah...20000 mm 3 / Ah...35000 mm 3 / Ah...55200 mm 3 / Ah.

[0132] By setting 3024 mm 3 / Ah≤V / E≤55200 mm 3 / Ah, the capacity density in the unit volume of the battery cell 100 can be improved.

[0133] In combination with FIGS. 1 and 2, in some embodiments of the present application, the shell 10 is a prismatic shell made of metal.

[0134] The metal material includes steel, iron, aluminum, aluminum alloy, etc., and has good heat dissipation performance and support performance. The prismatic shell enables the shell 10 to have multiple surfaces, thereby effectively increasing the surface area of the battery monomer 100 and improving the heat dissipation capacity of the battery monomer 100.

[0135] In combination with FIGS. 2 and 3, in some embodiments of the present application, the electrode terminal includes one first electrode terminal 21 and one second electrode terminal 22, the polarities of the first electrode terminal 21 and the second electrode terminal 22 are opposite, and the first electrode terminal 21 and the second electrode terminal 22 are respectively arranged at two ends of the length direction of the shell 10, or the first electrode terminal 21 and the second electrode terminal 22 are respectively arranged at two ends of the width direction of the shell 10.

[0136] Specifically, the electrode terminal of the battery monomer 100 can include one first electrode terminal 21 and one second electrode terminal 22, the first electrode terminal 21 can be connected with the positive tab and forms a positive terminal, and the second electrode terminal 22 can be connected with the negative tab and forms a negative terminal.

[0137] As shown in FIG. 2, the first electrode terminal 21 and the second electrode terminal 22 are respectively arranged at two ends of the shell 10 along the width direction Y of the battery body. As shown in FIG. 3, the first electrode terminal 21 and the second electrode terminal 22 are respectively arranged at two ends of the shell 10 along the length direction X of the battery body.

[0138] The first electrode terminal 21 and the second electrode terminal 22 can be reasonably selected in the setting position on the shell 10 according to the wiring requirement, thereby facilitating the first electrode terminal 21 and the second electrode terminal 22 to be respectively connected with the external wiring.

[0139] As shown in FIG. 4, in some embodiments of the present application, the electrode terminal includes a plurality of first electrode terminals 21 and a plurality of second electrode terminals 22, the polarities of the first electrode terminals 21 and the second electrode terminals 22 are opposite, wherein the plurality of first electrode terminals 21 are commonly arranged at one end of the width direction of the shell 10 and are arranged at intervals along the length direction of the shell 10, and the plurality of second electrode terminals 22 are commonly arranged at the other end of the width direction of the shell 10 and are arranged at intervals along the length direction of the shell 10.

[0140] As shown in FIG. 5, in some embodiments of the present application, a plurality of first electrode terminals 21 are respectively arranged at both ends of the width direction of the shell 10, a plurality of second electrode terminals 22 are respectively arranged at both ends of the width direction of the shell 10, and the first electrode terminals 21 and the second electrode terminals 22 at the same end are arranged in the length direction of the shell 10, and the first electrode terminals 21 and the second electrode terminals 22 at both ends are arranged opposite to each other in the width direction of the shell 10.

[0141] The plurality of first electrode terminals 21 and the plurality of second electrode terminals 22 can be reasonably selected in the setting position on the shell 10 according to the wiring requirement, so as to facilitate the connection of the first electrode terminals 21 and the second electrode terminals 22 with the external wiring respectively. Wherein, the plurality represents two or more than two.

[0142] As shown in FIG. 1, in some embodiments of the present application, the battery monomer 100 further comprises at least one pressure relief mechanism 30, at least one end of the width direction or the length direction of the shell 10 is provided with the pressure relief mechanism 30.

[0143] Specifically, the pressure relief mechanism 30 can be arranged on the other side wall of the shell 10 except the first wall 11, and can be at the same side, opposite side or adjacent side of the first electrode terminal 21. Wherein, the first wall 11 of the shell 10 refers to the side wall with the largest area. Optionally, the pressure relief mechanism 30 is an explosion-proof valve.

[0144] By arranging the pressure relief mechanism 30 on the shell 10, when the internal pressure or temperature of the battery monomer 100 reaches the threshold value, the pressure relief mechanism 30 can be opened and the internal pressure of the battery monomer 100 can be released, so as to improve the safety performance of the battery monomer 100.

[0145] As shown in FIG. 1, in some embodiments of the present application, the number of pressure relief mechanisms 30 is multiple, and the multiple pressure relief mechanisms 30 are commonly arranged at one end of the width direction of the shell 10, and the multiple pressure relief mechanisms 30 are arranged in the length direction of the shell 10.

[0146] By arranging multiple pressure relief mechanisms 30 and arranging the multiple pressure relief mechanisms 30 at one end of the width direction of the shell 10 in the length direction of the shell 10, when the internal pressure or temperature of the battery monomer 100 reaches the threshold value, one or several of the multiple pressure relief mechanisms 30 can be opened and the internal pressure of the battery monomer 100 can be released, so as to improve the safety performance of the battery monomer 100.

[0147] As shown in FIG. 1, in some embodiments of the present application, the battery monomer 100 further comprises a sampling chip 40, which can be arranged at one end of the length direction or one end of the width direction of the shell 10 and electrically connected with the controller, so as to collect the state of the battery monomer 100, including the power, temperature or other data.

[0148] In combination with FIG. 6 and FIG. 7, in a second aspect, the application provides an energy storage device, the energy storage device comprising a box body 200 and at least one battery cluster 300, the battery cluster 300 being arranged in a receiving cavity, the battery cluster 300 comprising a plurality of battery modules 310 connected in series, the battery module 310 comprising a plurality of battery monomers 100 arranged in a vertical direction, wherein the battery monomer 100 is the battery monomer 100 of any one of the above embodiments.

[0149] Specifically, the energy storage device can be an energy storage container 1000, the battery monomer 100 is arranged in the interior of the energy storage container 1000 and is used to provide electric energy for the energy storage container 1000.

[0150] Since the energy storage device of the application has the battery monomer 100 of any one of the above embodiments, the same technical effects as the battery monomer 100 of any one of the above embodiments can be achieved, and here will not be repeated.

[0151] In combination with FIG. 1, FIG. 6 and FIG. 7, in some embodiments of the application, the receiving cavity is provided with a plug-in interface along one side in the horizontal direction, and the battery module 310 is plugged into the receiving cavity through the plug-in interface, wherein the length direction and the width direction of the shell 10 respectively extend along the horizontal direction, the height direction of the shell 10 extends along the vertical direction, and the length direction of the shell 10 is consistent with the plug-in direction.

[0152] Specifically, the receiving cavity comprises a length direction, a width direction and a height direction. The length direction of the receiving cavity is the length direction of the box body 200, the width direction of the receiving cavity is the width direction of the box body 200, and the height direction of the receiving cavity is the height direction of the box body 200. The length direction A and the width direction B of the receiving cavity respectively extend along the horizontal direction, the height direction C of the receiving cavity extends along the vertical direction, the plug-in interface is formed on the side where the length direction A and the height direction C of the receiving cavity are located, the battery module 310 is plugged into the interior of the box body 200 along the width direction B of the receiving cavity, and the length direction X and the width direction Y of the shell respectively extend along the horizontal direction, the height direction Z of the shell extends along the vertical direction, and the length direction X of the shell is consistent with the width direction B of the receiving cavity.

[0153] Optionally, the box 200 is a 20-foot high-cube container, and the width of the internal accommodating cavity of the box 200 is 2438 mm. In the present application, the length direction X of the shell 10 is consistent with the width direction B of the accommodating cavity, and the length L of the shell 10 is set to be in the range of 2000 mm≤L≤2300 mm. Therefore, the length ratio of the shell 10 is less than the width of the accommodating cavity, and only one battery monomer 100 needs to be arranged in the box 200 along the width direction B of the accommodating cavity, so as to fully utilize the space in the width direction of the box 200, effectively reduce the number of battery monomers 100 arranged along the width direction B of the accommodating cavity, and facilitate the assembly of the battery monomers 100 in the box 200.

[0154] By setting the length direction of the shell 10 to be consistent with the plug-in direction, the number of battery monomers 100 arranged along the plug-in direction can be reduced, thereby facilitating the assembly of the battery monomers 100 in the box 200.

[0155] As shown in FIGS. 6-8, in some embodiments of the present application, the inside of the box 200 is spaced apart by a plurality of partitions 700 along the length direction of the box 200, and the plurality of partitions 700 divide the internal accommodating cavity of the box 200 into a plurality of cavities, and each cavity is provided with one battery cluster 300. Optionally, each battery cluster 300 includes an even number of battery modules 310 arranged along the length direction A of the box 200, thereby facilitating wiring between the even number of battery modules 310 in the same cavity. Optionally, two battery modules 310 can be arranged in the same cavity. Each battery module 310 includes a plurality of battery monomers 100 stacked and connected in the vertical direction, and the first electrode terminal 21 of one of the adjacent two battery monomers 100 and the second electrode terminal 22 of the other battery monomer 100 are arranged on the same side of the width direction of the shell 10 and connected by the conductive sheet 320, so that the plurality of battery monomers 100 in the same battery module 310 are connected in series.

[0156] By stacking and connecting the plurality of battery monomers 100 in the vertical direction to form the battery module 310, i.e., stacking the plurality of battery monomers 100 in the height direction of the battery monomers 100, the number of battery monomers 100 arranged in a unit size range in the vertical direction can be increased, thereby increasing the power of the battery module 310, or in the case of the same power of the battery module 310, the size of the battery module 310 in the vertical direction can be reduced.

[0157] As shown in FIGS. 6-8, in some embodiments of the present application, the energy storage device further includes at least one tray 400, the tray 400 is fixedly connected with the box 200, and the battery module 310 is arranged above the tray 400 and fixedly connected with the tray 400.

[0158] Specifically, the tray 400 is arranged in the accommodating cavity in the box body 200. The plurality of battery monomers in the battery module 310 can be sequentially stacked and bonded through the large surface, and the first electrode terminal 21 and the second electrode terminal 22 of the adjacent two battery monomers 100 are connected through the conductive sheet 320, so as to form the battery module 310. There is no frame structure in the battery module 310, and the battery monomer 100 located at the lowermost position in the vertical direction in the battery module 310 is directly connected with the tray 400. Optionally, the battery monomer 100 can be bonded with the tray 400, so as to form an integral whole and be assembled into the accommodating cavity.

[0159] In some embodiments of the present application, in order to improve the installation stability of the battery module 310, the energy storage device further comprises a support 500 arranged in the accommodating cavity and connected with the inner wall of the accommodating cavity, specifically, the bottom wall. The corresponding trays 400 of the adjacent two battery modules 310 are connected through the support 500, so as to improve the installation stability of the tray 400 and the battery module 310. In some embodiments of the present application, a fixing plate 600 can be arranged above the plurality of battery modules 310 in the same battery cluster 300, and the top of the plurality of battery modules 310 is connected with the fixing plate 600 respectively, so as to improve the fixing effect of the battery module 310 in the accommodating cavity. Optionally, the top of the battery module 310 can be bonded with the fixing plate 600.

[0160] By connecting the battery module with the tray 400, the battery module 310 can be fixed in the interior of the box body 200, and there is no need to set a frame structure for assembling the plurality of battery monomers 100 into the battery module 310, so as to reduce the occupied space of the frame structure in the box body 200, and further improve the space occupancy rate of the battery monomer 100 in the box body 200.

[0161] In some embodiments of the present application, the energy storage container 1000 is a 20-foot container, which can be a GBT1413-2023 series 1 container. The width dimension of the box body 200 is 2438mm. The length dimension of the box body 200 is 6100mm. The height dimension of the box body 200 can be 2896mm or 2591mm. When the height dimension of the box body 200 is 2896mm, the box type is 1CCC type. When the height dimension of the box body 200 is 2591mm, the box type is 1CC type.

[0162] Based on the internal space arrangement of the 20-foot container, taking the lithium iron phosphate battery monomer as an example, the size of the battery monomer 100 is set according to the following table (I), which can maximize the space utilization rate of the internal accommodating cavity of the box body 200. Among them, the electric quantity E' represents the electric quantity of the battery monomer 100.

[0163] Table (I)

[0164] In combination with FIG. 1 and FIG. 8, in some embodiments of the present application, the battery module 310 further comprises a heat exchange plate 330. The heat exchange plate 330 is attached to one side of the shell 10 in the width direction and is attached to each of the plurality of shells 10 arranged in sequence in the vertical direction.

[0165] Specifically, the heat exchange plate 330 is a generally flat plate structure and is attached to one side surface of the shell 10 in the width direction. The heat exchange plate 330 can be used for heat exchange with the battery monomer 100, thereby adjusting the temperature of the battery monomer 100.

[0166] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the following specific embodiments of the present application can be implemented in accordance with the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described.

[0167] In combination with FIG. 6 to FIG. 8, in some embodiments of the present application, the energy storage container 1000 comprises a box body 200 and a plurality of battery clusters 300, the inside of the box body 200 forms an accommodating cavity, the plurality of battery clusters 300 are arranged in the accommodating cavity in the horizontal direction, the battery cluster 300 comprises a plurality of battery modules 310 connected in series, the battery module 310 comprises a plurality of battery monomers 100 arranged in the vertical direction. One side of the accommodating cavity in the horizontal direction is provided with a plug-in interface, and the battery module 310 is plugged into the accommodating cavity through the plug-in interface. The energy storage container 1000 further comprises a tray 400, the tray 400 is fixedly connected with the box body 200, the battery module 310 is arranged above the tray 400 and is fixedly connected with the tray 400. Wherein, the battery monomer 100 comprises a shell 10, an electrode assembly and an electrode terminal, the electrode assembly is arranged in the shell 10 and is provided with a tab, and the electrode terminal is arranged on the shell 10 and is electrically connected with the tab. The shell 10 has a length dimension L, a width dimension W and a height dimension H, wherein H

[0168] In combination with FIG. 1, FIG. 6 and FIG. 7, the shell 10 has a length dimension L, a width dimension W and a height dimension H, wherein H 2 ≤L / V≤0.000265 / mm 20.00000019 / mm 2 ≤H / V≤0.00000093 / mm 2 0.000014 / mm 2 ≤W / V≤0.000071 / mm 2 The shell 10 has a surface area size S, where S = 2L*W + 2L*H + 2W*H, and 0.067 / mm≤S / V≤0.286 / mm. The battery cell 100 has a capacity E, 0.1212mm / Ah≤L / E≤1.74mm / Ah, 130.9mm 2 / Ah≤S / E≤3680mm 2 / Ah, 3024mm 3 / Ah≤V / E≤55200mm 3 / Ah.

[0169] As shown in FIG. 1, the shell 10 is a prismatic shell made of metal. The battery cell 100 further includes a first electrode terminal 21 and a second electrode terminal 22, the first electrode terminal 21 and the second electrode terminal 22 having opposite polarities, and the first electrode terminal 21 and the second electrode terminal 22 being respectively disposed at two ends of the shell 10 in the width direction. The battery cell 100 further includes a plurality of pressure relief mechanisms 30 configured to release the internal pressure of the shell 10 when the internal pressure or temperature of the shell 10 reaches a threshold value, the plurality of pressure relief mechanisms 30 being collectively disposed at one end of the shell 10 in the width direction, and the plurality of pressure relief mechanisms 30 being spaced apart along the length direction of the shell 10.

[0170] The above merely provides the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of the changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cell, wherein, The battery cell comprises: a housing, an inner portion of the housing being provided with a cavity; an electrode assembly provided in the cavity and provided with a tab; and an electrode terminal provided on the housing and electrically connected with the tab; the housing 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.

2. The battery cell of claim 1, wherein, 1.5 ≤ L / W ≤ 2.

7.

3. The battery cell of claim 1 or 2, wherein, 7 mm ≤ H ≤ 30 mm.

4. The battery cell of any one of claims 1 to 3, wherein, 2000 mm ≤ L ≤ 2300 mm.

5. The battery cell of any one of claims 1 to 4, wherein, 70 ≤ L / H ≤ 320.

6. The battery cell of claim 5, wherein, 210 ≤ L / H ≤ 320.

7. The battery cell of any one of claims 1 to 6, wherein, The housing has a volume size V, where V = L*W*H, and 0.000014 / mm 2 ≤ L / V ≤ 0.000265 / mm 2 .

8. The battery cell of any one of claims 1 to 7, wherein, The housing has a volume dimension V, where V = L*W*H, and 0.00000019 / mm 2 ≤ H / V ≤ 0.00000093 / mm 2 .

9. The battery cell of any one of claims 1 to 8, wherein, The housing has a volume dimension V, where V = L*W*H, and 0.000014 / mm 2 ≤ W / V ≤ 0.000071 / mm 2 .

10. The battery cell of any one of claims 1 to 9, wherein, the housing has a surface area dimension S, and the housing has 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.

11. The battery cell of any one of claims 1-10, wherein, the battery cell has a capacity E, wherein 0.1212 mm / Ah ≤ L / E ≤ 1.74 mm / Ah.

12. The battery cell of claim 11, wherein, 0.1212 mm / Ah ≤ L / E ≤ 0.8 mm / Ah.

13. The battery cell of any one of claims 1-12, wherein, The housing has a surface area size S, the battery cell has a capacity E, wherein S = 2L*W + 2L*H + 2W*H, 130.9mm 2 / Ah ≤ S / E ≤ 3680mm 2 / Ah.

14. The battery cell of any one of claims 1-13, wherein, The housing has a volume dimension V, the battery cell has a capacity E, wherein V = L*W*H, 3024 mm 3 / Ah ≤ V / E ≤ 55200 mm 3 / Ah.

15. The battery cell of any one of claims 1-14, wherein, the housing is a prismatic housing made of metal.

16. The battery cell of any one of claims 1-15, wherein, the electrode terminal comprises a first electrode terminal and a second electrode terminal, the first electrode terminal and the second electrode terminal have opposite polarities, and the first electrode terminal and the second electrode terminal are respectively provided at two ends of the length direction of the housing, or the first electrode terminal and the second electrode terminal are respectively provided at two ends of the width direction of the housing.

17. The battery cell of any one of claims 1-16, wherein, the battery cell further comprises a plurality of first electrode terminals and a plurality of second electrode terminals, the first electrode terminals and the second electrode terminals have opposite polarities, wherein the plurality of first electrode terminals are collectively provided at one end of the width direction of the housing and are arranged at intervals along the length direction of the housing, and the plurality of second electrode terminals are collectively provided at the other end of the width direction of the housing and are arranged at intervals along the length direction of the housing; or, the plurality of first electrode terminals are respectively provided at two ends of the width direction of the housing, the plurality of second electrode terminals are respectively provided at two ends of the width direction of the housing, the first electrode terminals and the second electrode terminals at the same end are arranged at intervals along the length direction of the housing, and the first electrode terminals and the second electrode terminals at the two ends are arranged opposite to each other along the width direction of the housing.

18. The battery cell of any one of claims 1-17, wherein, the battery cell further comprises at least one pressure relief mechanism, and at least one end of the width direction or the length direction of the housing is provided with the pressure relief mechanism.

19. The battery cell of claim 18, wherein, the number of the pressure relief mechanisms is a plurality, and the plurality of pressure relief mechanisms are collectively provided at one end of the width direction of the housing and are arranged at intervals along the length direction of the housing.

20. An energy storage device, wherein, The battery cell comprises: a housing, an inner portion of the housing being provided with a cavity; at least one battery cluster provided in the cavity, the battery cluster comprising a plurality of battery modules connected in series, and each battery module comprising a plurality of battery cells arranged in a vertical direction, wherein the battery cell is the battery cell according to any one of claims 1 to 19.

21. The energy storage device of claim 20, wherein, The accommodating cavity is provided with an insertion port at one side in a horizontal direction, and the battery module is inserted into the accommodating cavity through the insertion port, wherein the length direction and the width direction of the shell extend along the horizontal direction respectively, the height direction of the shell extends along the vertical direction, and the length direction of the shell is consistent with the insertion direction.

22. The energy storage device of claim 20 or 21, wherein, The energy storage device further comprises a tray fixedly connected with the box body, and the battery module is arranged above the tray and fixedly connected with the tray.

Images