Battery components, battery packs, energy storage battery cabinets and energy storage systems

Abstract

A battery module, a battery pack using the battery module, an energy storage battery cabinet, and an energy storage system. The battery module includes a plurality of single cells. The single cells are generally cuboid-shaped with a length of L0, a thickness of D0, and a height of H0, and satisfy 10 ≤ L0 / H0 ≤ 12; 50 ≤ L0 / D0 ≤ 90. The plurality of single cells are arranged along the width direction of the battery module, and the thickness direction of the single cells is consistent with the width direction of the battery module. The length direction of the single cells is consistent with the length direction of the battery module and extends from one side to the other opposite side in the length direction of the battery module. The width dimension of the battery module is D l、 The length dimension is L1, and satisfies 75% ≤ D1 / L1 ≤ 125%. Accordingly, while improving the energy density of the battery module and the corresponding battery pack, energy storage battery cabinet, and energy storage system, its structural stability is ensured.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a battery assembly, a battery pack using the battery assembly, an energy storage battery cabinet and an energy storage system. Background Art

[0002] With the development of electrochemical energy storage technology, energy storage is increasingly used in the power industry, and the energy density and structural stability requirements of energy storage battery packs are getting higher and higher. In related technologies, in order to improve the stability of the structure, it is usually necessary to set up more auxiliary reinforcement structures, resulting in low energy density. If the auxiliary reinforcement structure is omitted in exchange for the increase in energy density, the structural stability will not meet the requirements, so there is room for improvement. Summary of the invention

[0003] In view of this, the present invention aims to provide a battery assembly, a battery pack using the battery assembly, an energy storage battery cabinet and an energy storage system, which can improve the energy density of the battery assembly and the corresponding battery pack, the energy storage battery cabinet and the energy storage system while ensuring their structural stability.

[0004] The technical solution of the present invention is as follows.

[0005] A battery assembly has a predetermined length direction and a width direction perpendicular to the length direction, and includes a plurality of single cells, wherein the single cells are substantially rectangular and have a length of L0, a thickness of D0, a height of H0, and satisfy 10≤ L0 / H0 ≤ 12; 50≤ L0 / D0 ≤ 90;

[0006] The plurality of single cells are arranged along the width direction of the battery assembly, and the thickness direction of the single cells is consistent with the width direction of the battery assembly. The length direction of the single cells is consistent with the length direction of the battery assembly and extends from one side of the length direction of the battery assembly to the other opposite side. The width dimension of the battery assembly is D l、 The length dimension is L1 and satisfies 75%≤D1 / L1≤125%.

[0007] In some embodiments, the single battery satisfies: 70≤ L0 / D0≤90.

[0008] In some embodiments, the single cell satisfies: 400 mm<L0<1000 mm, 10 mm<D0<30 mm, 90 mm<H0<200 mm.

[0009] In some embodiments, the single cell satisfies: 500 mm<L0<970 mm, 10 mm<D0<15 mm, 80 mm<H0<100 mm.

[0010] In some embodiments, the battery assembly further includes a battery support, the battery support including a bottom plate extending along the width direction of the battery assembly and end plates connected to two opposite ends of the bottom plate; the bottoms of the plurality of single cells are at least partially supported on the bottom plate, and the two end plates are clamped on both sides of the plurality of single cells in the thickness direction; the width dimension D of the battery assembly is l、 is the distance between the outer end surfaces of the two end plates.

[0011] In some embodiments, among the plurality of single cells, at least some adjacent single cells have preset gaps between them, and the gaps are filled with an isolation medium layer.

[0012] In some embodiments, the distance of the gap is d1, and satisfies 0.5 mm ≤ d1 ≤ 2 mm.

[0013] In some embodiments, a buffer layer is disposed between at least one of the end plates and an adjacent single battery cell.

[0014] In some embodiments, the thickness of the buffer layer is d2, and satisfies 1 mm ≤ d2 ≤ 3 mm.

[0015] In some embodiments, the battery holder includes two bottom plates, the two bottom plates are spaced apart and respectively supported at two ends of the single battery in the length direction, and the two ends of the two end plates are respectively fixed to the two bottom plates.

[0016] In some embodiments, the battery holder further includes two baffles, which are respectively disposed on the two bottom plates and are used to stop both ends of the single battery in the length direction.

[0017] In some embodiments, the thickness of the end plate is d3, and satisfies 10 mm ≤ d3 ≤ 50 mm.

[0018] In some embodiments, the thickness d3 of the end plate satisfies 15 mm ≤ d3 ≤ 25 mm.

[0019] A battery pack comprises any one of the aforementioned battery assemblies; the battery assembly has a height direction perpendicular to its length direction and width direction, and the multiple battery assemblies are stacked along the height direction.

[0020] In some embodiments, the battery pack includes K battery components, 2≤ K ≤ 16.

[0021] In some embodiments, the battery pack has a height dimension H1 along a height direction of the battery assembly, and the height dimension H1 of the battery pack and the length dimension L1 of the battery assembly satisfy: 10%≤H1 / L1≤200%.

[0022] In some embodiments, the height dimension H1 of the battery pack and the length dimension L1 of the battery assembly satisfy: 80%≤H1 / L1≤120%.

[0023] In some embodiments, the battery module includes an even number of single cells; the single cells include a positive terminal and a negative terminal, and the positive terminal and the negative terminal are respectively located at two opposite ends in the length direction of the single cells.

[0024] An energy storage battery cabinet, comprising:

[0025] Cabinet;

[0026] Any of the above-mentioned battery packs, wherein the battery pack is installed and accommodated in the cabinet;

[0027] An air conditioning assembly, installed on the cabinet and used to adjust the temperature inside the cabinet; and

[0028] The battery manager is electrically connected to the battery pack and is used to manage the battery pack.

[0029] An energy storage system comprises the energy storage battery cabinet.

[0030] In the aforementioned battery assembly, the length direction of the single cell is consistent with the length direction of the battery assembly and extends from one side of the length direction of the battery assembly to the other opposite side. In other words, only one single cell is arranged in the length direction of the battery assembly, and the single cell as a whole is arranged from one side to the other side. No auxiliary reinforcement is required in the length direction, which can ensure a high volume utilization rate and energy density. At the same time, multiple single cells are arranged along the width direction of the battery assembly, which can form a limit and reinforcement between each other. The single cell can also play an auxiliary reinforcement role in the length direction of the formed battery assembly, which can ensure the overall structural strength of the battery assembly. In addition, the width dimension of the battery assembly is D l、 The length dimension L1 satisfies 75%≤D1 / L1≤125%, so that the plane projection of the battery assembly is close to a square, the center of gravity is roughly at the center, and the forces on each structural member are relatively uniform and stable during transportation and after installation. The battery pack, energy storage battery cabinet and energy storage system using this battery assembly can also use the above characteristics of the battery assembly to improve energy density, structural strength and overall stability.

[0031] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0033] Figure 1 is a schematic structural diagram of an energy storage system according to an embodiment of the present invention.

[0034] Figure 2 yes Figure 1 Schematic diagram of the structure of the energy storage battery cabinet.

[0035] Figure 3 yes Figure 2 The schematic diagram of the structure of the battery pack in the energy storage battery cabinet is shown.

[0036] Figure 4 yes Figure 3 Schematic diagram of the structure of the battery components in the battery pack shown.

[0037] Figure 5 yes Figure 4 The left side view of the battery assembly is shown, and the view is a broken view.

[0038] Figure 6 yes Figure 5 A partial enlarged view of part A.

[0039] Figure 7 yes Figure 4 Schematic diagram of the structure of a single cell in a battery assembly shown.

[0040] Figure 8 yes Figure 4 Schematic diagram of the structure of the battery bracket in the battery assembly shown.

[0041] Reference numerals:

[0042] Energy storage system 1000, energy storage battery cabinet 100, distribution box 200, installation frame 300

[0043] Cabinet 11, battery pack 12, air conditioning component 12, battery manager 14,

[0044] Battery assembly 120, single battery 121, battery support 122, isolation medium layer 123, buffer layer 124,

[0045] Bottom plate 1221 , end plate 1222 , baffle plate 1223 , and air duct gap 1224 . DETAILED DESCRIPTION

[0046] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0047] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0048] In the description of the present invention, "plurality" means two or more than two, and "several" means one or more.

[0049] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0050] like Figure 1 As shown, an energy storage system 1000 is disclosed, including a plurality of energy storage battery cabinets 100 and a distribution box 200. The energy storage system 1000 may generally be a household energy storage system or a commercial energy storage system, and the number of energy storage battery cabinets 100 included therein may be set according to specific needs. The plurality of energy storage battery cabinets 100 are electrically connected to the distribution box 200 to achieve power distribution management. In some embodiments, the energy storage system 1000 may further include a mounting frame 300, and the battery cabinet 100 and the distribution box 200 may both be mounted on the mounting frame 300.

[0051] like Figure 2 As shown, the energy storage battery cabinet 100 may include a cabinet 11, a battery pack 12, an air conditioning component 13, and a battery manager 14. A receiving space is formed inside the cabinet 11, and the battery pack 12 is received inside the cabinet 11. The air conditioning component 13 is installed on the cabinet 11, and can usually be installed inside the cabinet 11, such as hanging on the inner wall of the cabinet 11, or can be installed outside the cabinet 11, to adjust the internal working temperature of the battery cabinet 100. The battery manager 14 can be used for charge and discharge management of the battery pack 12.

[0052] like Figures 3 to 8 As shown, the battery pack 12 includes a plurality of battery assemblies 120 .

[0053] Since the architecture of the energy storage system 1000 and the above-mentioned structural hierarchy of the energy storage battery cabinet 100 are not the focus of the improvement of this case, and there are many typical implementation methods of the above-mentioned structural hierarchy in the prior art, they will not be described in detail here. In this application, the improvement of the energy storage system 1000 and the energy storage battery cabinet 100 mainly depends on the battery pack 12 and the battery module 120, so the specific implementation methods of the battery pack 12 and the battery module 120 are mainly described in detail below.

[0054] In the battery pack 12, the battery assembly 120 has a preset length direction, width direction and height direction, and the length direction, width direction and height direction are perpendicular to each other. The multiple battery assemblies 120 are stacked along the height direction. The height direction here can be understood as the vertical direction. Usually, in actual applications, the height direction of the energy storage system 1000 or the energy storage battery cabinet 100 included therein after it is placed or installed is the vertical direction. The battery pack 12 is roughly rectangular in shape. Therefore, for ease of understanding, the direction of the battery assembly 120 that is the same as the vertical direction under normal use is defined as its height direction, and accordingly, its length direction and width direction are defined in the horizontal direction.

[0055] The battery assembly 120 includes a plurality of single cells 121, each of which is roughly in the shape of a rectangular parallelepiped, and the length of the rectangular parallelepiped single cell is L0, the thickness is D0, and the height is H0, and 10 ≤ L0 / H0 ≤ 12; 50 ≤ L0 / D0 ≤ 90 are satisfied. The single cell 121 is roughly in the shape of a rectangular parallelepiped, which means that the main part of the single cell 121 is in the shape of a rectangular parallelepiped, but because the single cell 121 generally also includes electrode terminals, explosion-proof valves and other structures located at the ends of the main part, the overall shape is not strictly rectangular, or due to factors such as dimensional shape tolerances and local irregularities, the overall shape is not strictly rectangular, but generally meets the shape of a rectangular parallelepiped. Accordingly, the length of the single cell 121 can be understood as the length of the main part of the single cell 121, that is, the part excluding the electrode terminals.

[0056] The plurality of single cells 121 are arranged along the width direction of the battery assembly 120, and the thickness direction of the single cells 121 is consistent with the width direction of the battery assembly 120, and the length direction of the single cells 121 is consistent with the length direction of the battery assembly 120. At the same time, each single cell 121 extends from one side of the length direction of the battery assembly 120 to the other opposite side. In other words, only one single cell 121 is arranged in the length direction of each battery assembly 120, and the single cell 121 is arranged from one side to the other side as a whole. No auxiliary reinforcement is required along the length direction of the battery assembly 120, which can ensure a high volume utilization rate and energy density. At the same time, the plurality of single cells 121 are arranged along the width direction of the battery assembly 120, which can form a limit and reinforcement between each other, and the single cells can also play an auxiliary reinforcement role in the length direction of the formed battery assembly 120, thereby ensuring the overall structural strength of the battery assembly 120.

[0057] In addition, the width dimension of the battery assembly 120 is D l、 The length dimension is L1 and satisfies 75%≤D l / L1≤125%. The width dimension D of the battery assembly 120 l The length dimension L1 is constrained within the ratio range, so that the plane projection of the battery assembly 120 is close to a square, the center of gravity is roughly at the center, and the forces on each structural component are relatively uniform and stable during transportation and after installation. For example, in actual applications, the width dimension D of the battery assembly 120 is l、 The length dimension L1 may preferably be in a ratio of about 1:1, so that the projection of the battery assembly 120 on the horizontal plane is close to a square, and the center of gravity distribution is controlled to improve stability. Of course, in a specific implementation, the width dimension D l、 The ratio of the length dimension L1 can also be adjusted within the above range according to specific needs.

[0058] At the same time, the length L0, thickness D0, and height H0 of the rectangular single battery 121 satisfy 10 ≤ L0 / H0 ≤12; 50 ≤ L0 / D0 ≤ 90. This size limitation is also to maximize the volume energy density while ensuring the stability and overall structural strength of the battery assembly 1. Specifically, the ratio of the length to the thickness of the single battery 121 is limited because when the ratio is larger, the number of single batteries 121 that can be arranged is more, the volume utilization rate is increased, and the power is more. At the same time, in order to make the sum of the thickness dimensions of the single batteries 121 arranged in the thickness direction close to the length of the single battery 121, the projection shape of the multiple single batteries arranged in the horizontal direction is close to a square, and the center of gravity is located in the middle. When multiple battery assemblies 120 are stacked from bottom to top, the center of gravity of the entire battery pack 12 is also located in the middle, which is relatively stable. When the ratio of the length to the thickness of the single cell 121 is too large, the structural strength of the single cell 121 will be weakened, and the expansion force generated after multiple charge and discharge cycles will damage the internal battery cells; when the ratio of the length to the thickness of the single cell is too small, the number of single cells 121 contained in each layer of the battery assembly 120 will be reduced while ensuring stability. If the number of single cells 121 is increased, not only will the structure of the battery assembly 120 be unstable, but when multiple battery assemblies 120 are stacked into a battery pack 12, the stacking height will also be limited. Therefore, after long-term research and multiple experimental verifications, the inventors have found that in order to simultaneously meet the aforementioned requirements for the stability of the battery assembly 1, the overall structural strength, and the maximum volume energy density, the aforementioned size requirements must be met.

[0059] The battery pack 12 , the energy storage battery cabinet 100 , and the energy storage system 1000 using the battery assembly 120 can also utilize the above-mentioned characteristics of the battery assembly 120 to improve energy density, structural strength, and overall stability.

[0060] In some embodiments, the single battery satisfies: 70≤ L0 / D0≤90.

[0061] In some embodiments, the single cell meets the following conditions: 400mm<L0<1000mm, 10mm<D0<30mm, 90mm<H0<200mm. In some usage scenarios, such as the energy storage battery cabinet 100 used in the home generally adopts a wall-mounted structure, the single cell 121 needs to be as flat as possible, and the single cells 121 on each battery assembly 120 also need to be as flat as possible after being arranged. In this way, after the energy storage battery cabinet 100 using the above-mentioned single cell 121 is hung on the wall, the size of the protruding wall is less likely to exceed 500mm, thereby hardly interfering with the user's normal activities at home and better meeting the usage needs of home users.

[0062] In some embodiments, the single cell meets the following conditions: 500mm<L0<970mm, 10mm<D0<15mm, 80mm<H0<100mm. In some use scenarios, for example, the energy storage battery cabinet 1 used in industry and commerce generally requires one single cell 121 to be arranged in length, and multiple single cells 121 can be stacked in thickness and height directions. In this way, the energy storage battery cabinet 1 using the above single cell 121 can store more electricity and has a stronger power supply capacity, meeting the use needs of industry and commerce.

[0063] In some embodiments, the battery assembly 120 further includes a battery support 122, and the battery support 122 includes a bottom plate 1221 extending along the width direction of the battery assembly 120 and end plates 1222 connected to two opposite ends of the bottom plate 1221. The bottoms of the plurality of single cells 121 are at least partially supported on the bottom plate 1221, and the two end plates 1222 are sandwiched between the two sides of the plurality of single cells 121 in the thickness direction. The width dimension D of the battery assembly 120 is l、 is the distance between the outer end surfaces of the two end plates 1222.

[0064] By providing a battery holder 122, a plurality of single cells 121 can be fixed by the battery holder 122, so that the structural strength of the battery holder 122 itself can be used to assist in improving the structural strength of the single cells 121, so that the number of battery assemblies 120 that can be arranged in the battery holder 122, the energy storage battery cabinet 100 and the energy storage system 1000 can be greater. For example, in the battery holder 122, the number of battery assemblies 120 can be 6-20 and they can be stacked in sequence in the height direction, so that the volume utilization rate of the energy storage battery cabinet 100 and the energy storage system 1000 is greater and the energy density is higher.

[0065] In some embodiments, among the plurality of single cells 121, at least some of the adjacent single cells 121 are preset with gaps, and the gaps are filled with an isolation dielectric layer 123. In a specific implementation, the isolation dielectric layer 123 can be made of insulating and heat-insulating materials, which can reduce the impact of transportation vibration and battery expansion on the battery assembly 1, and can also prevent heat propagation between single cells, reduce the risk of damage to the battery module structure and thermal runaway, and can also play an insulating role. The isolation dielectric layer 123 can partially fill the corresponding gaps. For example, the isolation dielectric layer 123 can include a limiting part and an isolation part. The thickness of the limiting part can be roughly the same as the distance of the gap, which is used to limit the position between adjacent single cells 121, and the thickness of the isolation part is less than the distance of the gap, so that a partial gap is retained between adjacent single cells 121, reducing the impact of transportation vibration and battery expansion on the battery assembly 1.

[0066] In some embodiments, the distance of the gap is d1, and satisfies 0.5 mm≤d1≤2 mm.

[0067] In some embodiments, a buffer layer 124 is provided between at least one of the end plates 1222 and the adjacent single battery 121. The buffer layer 124 may be made of foam. The end plate 122 is provided with foam, which can be used to buffer the expansion force generated by the single battery 121 during use. At the same time, since the buffer layer 124 can be elastically retractable, it can be used to offset the accumulation of dimensional tolerances during assembly. The thickness of the buffer layer is d2, and satisfies 1mm≤d2≤3mm.

[0068] When the battery assembly 120 further includes at least one of the aforementioned isolation dielectric layer 123 and buffer layer 124, the width dimension D of the battery assembly 120 is l is still the distance between the outer end surfaces of the two end plates 1222. Accordingly, the width dimension D l Including the thickness of the isolation dielectric layer 123 and the buffer layer 124.

[0069] In some embodiments, the thickness of the end plate 1222 is d3, and satisfies 10 mm ≤ d3 ≤ 50 mm. Further, the thickness d3 of the end plate 1222 satisfies 15 mm ≤ d3 ≤ 25 mm. Thus, the end plate 1222 meets the structural strength required for the constraint while not being too thick to occupy too much volume.

[0070] In some embodiments, the battery support 122 includes two bottom plates 1221, which are spaced apart and supported at both ends of the length direction of the single battery 121, and the two ends of the two end plates 1222 are fixed to the two bottom plates 1221. In this way, the interval between the two bottom plates 1221 forms an air duct gap 1224, and the two bottom plates 1221 can also guide the gas entering the air duct gap 1224, thereby improving the heat dissipation efficiency of the gas to the single battery 121, making the single battery 121 less susceptible to heat damage, and extending the service life of the energy storage battery cabinet 100.

[0071] In some embodiments, the battery holder further includes two baffles 1223, which are respectively disposed on the two bottom plates 1221 and are used to stop the two ends of the length direction of the single battery 121. Specifically, the width of the baffle 1223 may be smaller than the width of the corresponding bottom plate 1221, and the baffle 1223 may be stacked and fixed on the upper side of the corresponding bottom plate 1221. The outer side of the baffle 1223 in the width direction may be substantially flush with the outer side of the bottom plate 1221, and the inner side and the bottom plate 1221 together form a stop step. When the temperature end of the single battery 121 is supported on the corresponding bottom plate 1221, the end is stopped and positioned by the stop step.

[0072] The battery pack 120 includes a plurality of battery assemblies 120, and the plurality of battery assemblies 120 are stacked in the height direction. For example, in some embodiments, the battery pack includes K battery assemblies, 2≤ K ≤ 16. Adjacent battery assemblies 120 can be installed and fixed by connecting between battery brackets 122. For example, the battery brackets 122 of adjacent battery assemblies 120 can be fixed by screw connection.

[0073] In some embodiments, the battery pack has a height dimension H1 along the height direction of the battery assembly, and the height dimension H1 of the battery pack and the length dimension L1 of the battery assembly satisfy: 10%≤H1 / L1≤200%, and further, the height dimension H1 of the battery pack and the length dimension L1 of the battery assembly satisfy: 80%≤H1 / L1≤120%. In this way, the center of the battery pack 120 can be made as close to its geometric center as possible, and the structure is more stable. When the battery holder 122 includes multiple battery assemblies 120, the height H1 of the battery holder 122 can be understood as the sum of the heights of the multiple battery assemblies 120.

[0074] In some embodiments, the battery module includes an even number of cells; the cells include a positive terminal and a negative terminal, and the positive terminal and the negative terminal are located at two opposite ends of the length direction of the cells. In this way, the positive terminal and the negative terminal of the cells 121 are located on opposite sides, and the even number arrangement facilitates the connection between the upper and lower battery assemblies 120.

[0075] In the description of this specification, the description with reference to the terms "specific embodiment", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0076] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery assembly having a predetermined length direction and a width direction perpendicular to the length direction, and comprising a plurality of single cells, characterized in that: The single battery is roughly rectangular and has a length of L0, a thickness of D0, a height of H0, and satisfies 10≤L0 / H0≤12; 50≤L0 / D0≤90; The plurality of single cells are arranged along the width direction of the battery assembly, and the thickness direction of the single cells is consistent with the width direction of the battery assembly. The length direction of the single cells is consistent with the length direction of the battery assembly and extends from one side of the length direction of the battery assembly to the other opposite side. The width dimension of the battery assembly is D l , the length dimension is L1, and satisfies 75%≤D1 / L1≤125%; The battery assembly also includes a battery support, which includes a bottom plate extending along the width direction of the battery assembly and end plates connected to two opposite ends of the bottom plate; the bottoms of the plurality of single cells are at least partially supported on the bottom plate, and the two end plates are clamped on both sides of the plurality of single cells in the thickness direction; the width dimension D of the battery assembly is l is the distance between the outer end faces of the two end plates; The battery support comprises two bottom plates, the two bottom plates are spaced apart and respectively supported at two ends of the length direction of the single battery, and the two ends of the two end plates are respectively fixed to the two bottom plates; The battery support further comprises two baffles, which are respectively arranged on the two bottom plates and are used to stop the two ends of the single battery in the length direction.

2. The battery assembly according to claim 1, characterized in that: The single cell battery satisfies: 70≤L0 / D0≤90.

3. The battery assembly according to claim 1, characterized in that: The single cell meets the following requirements: 400mm<L0<1000mm, 10mm<D0<30mm, 90mm<H0<200mm.

4. The battery assembly according to claim 3, characterized in that: The single cell meets the following requirements: 500mm<L0<970mm, 10mm<D0<15mm, 80mm<H0<100mm.

5. The battery assembly according to claim 1, characterized in that: Among the plurality of single cells, at least some of the adjacent single cells are provided with gaps, and the gaps are filled with an isolation medium layer.

6. The battery assembly according to claim 5, characterized in that: The distance of the gap is d1, and satisfies 0.5mm≤d1≤2mm.

7. The battery assembly according to claim 1, characterized in that: A buffer layer is arranged between at least one of the end plates and the adjacent single battery cells.

8. The battery assembly according to claim 7, characterized in that: The thickness of the buffer layer is d2, and satisfies 1mm≤d2≤3mm.

9. The battery assembly according to claim 1, characterized in that: The thickness of the end plate is d3, and satisfies 10mm≤d3≤50mm.

10. The battery assembly according to claim 9, characterized in that: The thickness d3 of the end plate satisfies 15 mm ≤ d3 ≤ 25 mm.

11. A battery pack, characterized in that: The battery pack comprises a plurality of battery assemblies as described in any one of claims 1 to 10; the battery assembly has a height direction perpendicular to its length direction and width direction, and the plurality of battery assemblies are stacked along the height direction.

12. The battery pack according to claim 11, characterized in that: The battery pack includes K battery components, 2≤K≤16.

13. The battery pack according to claim 11, characterized in that: The battery pack has a height dimension H1 along the height direction of the battery assembly, and the height dimension H1 of the battery pack and the length dimension L1 of the battery assembly satisfy: 10%≤H1 / L1≤200%.

14. The battery pack according to claim 13, characterized in that: The height dimension H1 of the battery pack and the length dimension L1 of the battery assembly satisfy: 80%≤H1 / L1≤120%.

15. The battery pack according to claim 11, characterized in that: The battery module includes an even number of single cells; the single cells include a positive terminal and a negative terminal, and the positive terminal and the negative terminal are respectively located at two opposite ends of the single cells in the length direction.

16. An energy storage battery cabinet, characterized in that: include: Cabinet; The battery pack according to any one of claims 11 to 15, installed and accommodated in the cabinet; An air conditioning assembly, installed on the cabinet and used to adjust the temperature inside the cabinet; and The battery manager is electrically connected to the battery pack and is used to manage the battery pack.

17. An energy storage system, characterized in that: Comprising at least one energy storage battery cabinet as claimed in claim 16.

Images