energy storage device

Abstract

This application provides an energy storage device, belonging to the field of energy storage technology. The energy storage device includes a housing and multiple battery cells. The housing has a battery compartment, within which the multiple battery cells are housed. Each battery cell includes a casing and electrode terminals, with the electrode terminals disposed on the casing. The volume of the battery compartment is V1, and the sum of the volumes of the casings of all the battery cells within the compartment is V2, where 0.4 ≤ V2 / V1 ≤ 0.95. This results in a relatively large volume proportion of all battery cells within the battery compartment, thereby improving the space utilization of the battery compartment and contributing to a higher volumetric energy density of the energy storage device.

Description

[0001] Cross-reference of related applications

[0002] This application claims priority to international application (PCT / CN2023 / 101944) entitled “Energy Storage Device”, filed on June 21, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of energy storage technology, and more specifically, to an energy storage device. Background Technology

[0004] Energy storage devices are electrical energy storage and transfer equipment. They can be used in power systems to store surplus electricity during off-peak hours to supplement peak demand. Therefore, energy storage devices can both store excess power generated by the power generation system and supply power to the grid when the power generation system generates less electricity.

[0005] Energy storage devices typically consist of a casing and multiple battery cells housed within it. These cells can be connected in series, parallel, or a combination of multiple interconnected cells to store electrical energy. Currently, the volumetric energy density of energy storage devices is relatively low. Therefore, improving the volumetric energy density of energy storage devices is a pressing issue that needs to be addressed. Summary of the Invention

[0006] This application provides an energy storage device that can effectively improve the volumetric energy density of the energy storage device.

[0007] This application provides an energy storage device, including a housing and multiple battery cells. The housing has a battery compartment, in which the multiple battery cells are housed. Each battery cell includes a shell and electrode terminals, with the electrode terminals disposed on the shell. The volume of the battery compartment is V1, and the sum of the volumes of the shells of all the battery cells in the battery compartment is V2, where 0.4 ≤ V2 / V1 ≤ 0.95.

[0008] In the above technical solution, V2 / V1≤0.95 ensures that the volume ratio of each battery cell within the battery compartment is not too large, reducing the assembly precision requirements of the energy storage device and effectively controlling the manufacturing cost of the energy storage device within a reasonable range. V2 / V1≥0.4 ensures that the volume ratio of each battery cell within the battery compartment is relatively large, thereby improving the space utilization rate of the battery compartment and contributing to increasing the volumetric energy density of the energy storage device.

[0009] In some embodiments, 0.5 ≤ V2 / V1 ≤ 0.85. This balances the volumetric energy density and economic requirements of energy storage devices, which helps to further reduce the manufacturing cost of energy storage devices and increase their volumetric energy density.

[0010] In some embodiments, 0.52 ≤ V2 / V1 ≤ 0.75. This allows for both relatively low manufacturing costs and relatively high volumetric energy density of the energy storage device.

[0011] In some embodiments, the volume of the casing of each battery cell is V3, and the number of battery cells in the battery compartment is N1, satisfying: V2 = V3 * N1. This ensures that the casing volumes of all battery cells in the battery compartment are equal, allowing the use of battery cells of the same specification. On the one hand, this improves the assembly efficiency of the energy storage device; on the other hand, it reduces the probability of wasted space due to different specifications of battery cells within the battery compartment.

[0012] In some embodiments, 0.0001 ≤ V3 / V1 ≤ 0.00025. V3 / V1 ≥ 0.0001 results in a larger volume ratio of the battery cell casing within the battery compartment. With a fixed battery compartment volume, this reduces the number of battery cells and lowers the probability of reduced usable space due to an excessive number of battery cells, thus improving the volumetric energy density of the energy storage device. V3 / V1 ≤ 0.00025 ensures that the volume ratio of the battery cell casing within the battery compartment is not too large, reducing the manufacturing difficulty and cost of the battery cells.

[0013] In some embodiments, 0.00015 ≤ V3 / V1 ≤ 0.0002. This balances the volumetric energy density of the energy storage device, the ease of manufacturing individual battery cells, and the economic requirements of individual battery cells, which is beneficial for improving the volumetric energy density of the energy storage device and reducing the manufacturing difficulty and cost of individual battery cells.

[0014] In some embodiments, 0.0026m 3 ≤V3≤0.008m 3 This will help to further improve the volumetric energy density of energy storage devices and reduce the manufacturing cost of individual battery cells.

[0015] In some embodiments, 0.004m 3 ≤V3≤0.006m 3 It can control the volumetric energy density of energy storage devices at a relatively high level, while keeping the manufacturing cost of individual battery cells at a low level.

[0016] In some embodiments, the volume of the housing is V, satisfying: 0.45 ≤ V1 / V ≤ 0.75. V1 / V ≥ 0.45 ensures that the battery compartment's volume accounts for a larger proportion of the housing's volume, increasing the usable effective space within the housing and thus improving the volumetric energy density of the energy storage device. V1 / V ≤ 0.75 prevents the battery compartment from becoming excessively large, allowing the energy storage device to reserve more installation space for other components and reducing the installation difficulty of those components.

[0017] In some embodiments, 0.55 ≤ V1 / V ≤ 0.65. This balances the volumetric energy density of the energy storage device with the ease of installation of other components.

[0018] In some embodiments, 20m 3 ≤V≤80m 3 V≥20m 3 This results in a larger container size, which is beneficial for meeting the high energy requirements of energy storage devices and storing more electrical energy; V≤80m 3 This ensures that the container is not too large, making it easy to handle and transport the energy storage device.

[0019] In some embodiments, 35m 3 ≤V≤50m 3 It can further balance the requirements of large energy capacity of energy storage devices and the convenience of handling and transportation of energy storage devices.

[0020] In some embodiments, the battery compartment contains multiple battery cells arranged along the length of the housing. The dimension of the battery compartment along the length of the housing is L1, and the sum of the dimensions of the outer shells of the multiple battery cells arranged within the battery compartment is L2, satisfying: 0.6 ≤ L2 / L1 ≤ 0.95. L2 / L1 ≥ 0.6 ensures that the outer shells of the multiple battery cells arranged along the length of the housing constitute a large proportion of the total dimension of the battery compartment along the length of the housing. This fully utilizes the space of the battery compartment along the length of the housing, reduces the gap between the outer shells of adjacent battery cells along the length of the housing, and helps to increase the volumetric energy density of the energy storage device by increasing the volumetric energy proportion of all battery cell outer shells within the battery compartment. L2 / L1 ≤ 0.95 ensures that the battery compartment has sufficient installation margin for multiple battery cells along the length of the housing, reducing the difficulty of installing the battery cells.

[0021] In some embodiments, 0.75 ≤ L2 / L1 ≤ 0.9. This balances the volumetric energy density of the energy storage device with the ease of installation of individual battery cells along the length of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device while further reducing the difficulty of installing individual battery cells along the length of the enclosure.

[0022] In some embodiments, the outer casing of each battery cell has a dimension of L3 along the length of the housing, and N2 battery cells are arranged in the battery compartment, satisfying: L2 = L3 * N2. This ensures that the outer casings of multiple battery cells have equal dimensions along the length of the housing, effectively reducing the probability of wasted space due to differences in the dimensions of the battery cell casings along the length of the housing. During assembly, multiple battery cells of the same specification can be arranged along the length of the housing, improving the assembly efficiency of the energy storage device and reducing its manufacturing cost.

[0023] In some embodiments, 0.03 ≤ L3 / L1 ≤ 0.12. L3 / L1 ≥ 0.03 ensures that the battery cell casing accounts for a larger proportion of the battery compartment's length along the casing. Given a fixed length of the battery compartment, this reduces the number of battery cells that can be accommodated along the casing's length, decreasing the probability of reduced usable space due to an excessive number of battery cells, thus improving the volumetric energy density of the energy storage device. L3 / L1 ≤ 0.12 ensures that the battery cell casing does not account for an excessively large proportion of the battery compartment's length along the casing, effectively reducing the manufacturing difficulty and cost of the battery cells.

[0024] In some embodiments, 0.055 ≤ L3 / L1 ≤ 0.09. This is beneficial for further improving the volumetric energy density of energy storage devices and reducing the manufacturing cost of individual battery cells.

[0025] In some embodiments, 0.17m ≤ L3 ≤ 0.6m. L3 ≥ 0.17m results in a larger dimension of the battery cell's casing along the length of the housing, which is beneficial for increasing the proportion of the battery cell's casing within the battery compartment along the length of the housing, and thus improving the volumetric energy density of the energy storage device. L3 ≤ 0.6m prevents the battery cell's casing from becoming excessively large along the length of the housing, effectively reducing the manufacturing difficulty and cost of the battery cells.

[0026] In some embodiments, 0.2m ≤ L3 ≤ 0.45m. This is beneficial for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of individual battery cells.

[0027] In some embodiments, the dimension of the housing along its length is L, satisfying: 0.65 ≤ L1 / L ≤ 0.95. L1 / L ≥ 0.65 ensures that the battery compartment occupies a large proportion of the housing's length, providing more space for individual battery cells and thus improving the volumetric energy density of the energy storage device. L1 / L ≤ 0.95 ensures sufficient margin in the length direction of the housing for the portion not occupied by the battery compartment, resulting in adequate structural strength.

[0028] In some embodiments, 0.75 ≤ L1 / L ≤ 0.9. This balances the requirements of volumetric energy density of the energy storage device and structural strength of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device and further improving the structural strength of the enclosure.

[0029] In some embodiments, 3m ≤ L ≤ 9m. L ≥ 3m results in a larger length dimension of the enclosure, allowing for a larger battery compartment along the enclosure's length, which increases the battery compartment's proportion within the enclosure and improves the volumetric energy density of the energy storage device. L ≤ 9m ensures the enclosure's length dimension is not excessively large, facilitating the handling and transportation of the energy storage device.

[0030] In some embodiments, 5m ≤ L ≤ 7m. This further balances the volumetric energy density of the energy storage device with the ease of handling and transportation of the energy storage device.

[0031] In some embodiments, the battery compartment contains multiple battery cells arranged along the width direction of the housing. The dimension of the battery compartment along the width direction is D1, and the sum of the dimensions of the outer shells of the multiple battery cells arranged within the battery compartment is D2, satisfying: 0.6 ≤ D2 / D1 ≤ 0.95. D2 / D1 ≥ 0.6 ensures that the outer shells of the multiple battery cells arranged along the width direction constitute a large proportion of the battery compartment's dimensions along the width direction. This fully utilizes the space of the battery compartment in the width direction, reduces the gap between the outer shells of adjacent battery cells in the width direction, and helps increase the volumetric energy density of the energy storage device by increasing the overall volumetric energy proportion of the battery cell outer shells within the battery compartment. D2 / D1 ≤ 0.95 ensures that the battery compartment has sufficient installation margin in the width direction of the housing for installing multiple battery cells, reducing the difficulty of installing the battery cells.

[0032] In some embodiments, 0.75 ≤ D2 / D1 ≤ 0.9. This balances the volumetric energy density of the energy storage device with the ease of installation of individual battery cells in the width direction of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device while further reducing the difficulty of installing individual battery cells in the width direction of the enclosure.

[0033] In some embodiments, the outer casing of each battery cell has a dimension of D3 along the width direction of the housing, and N3 battery cells are arranged in the battery compartment, satisfying: D2 = D3 * N3. This ensures that the outer casing dimensions of multiple battery cells are equal along the width direction of the housing, effectively reducing the probability of wasted space due to differences in the outer casing dimensions of the battery cells along the width direction. During assembly, multiple battery cells of the same specification can be arranged along the width direction of the housing, improving the assembly efficiency of the energy storage device and reducing its manufacturing cost.

[0034] In some embodiments, 0.02 ≤ D3 / D1 ≤ 0.05. D3 / D1 ≥ 0.02 ensures that the battery cell casing accounts for a larger proportion of the battery compartment's width along the entire casing. Given a fixed width of the battery compartment, this reduces the number of battery cells that can be accommodated within the compartment, decreasing the probability of reduced usable space due to an excessive number of battery cells, thus improving the volumetric energy density of the energy storage device. D3 / D1 ≤ 0.05 ensures that the battery cell casing does not account for an excessively large proportion of the battery compartment's width along the entire casing, effectively reducing the manufacturing difficulty and cost of the battery cells.

[0035] In some embodiments, 0.032 ≤ D3 / D1 ≤ 0.04. This is beneficial for further improving the volumetric energy density of energy storage devices and reducing the manufacturing cost of individual battery cells.

[0036] In some embodiments, 0.04m ≤ D3 ≤ 0.12m. D3 ≥ 0.04m results in a larger dimension of the battery cell's casing along the width of the housing, which is beneficial for increasing the proportion of the battery cell's casing within the battery compartment along the width of the housing, and thus improving the volumetric energy density of the energy storage device. D3 ≤ 0.12m prevents the battery cell's casing from becoming excessively large along the width of the housing, effectively reducing the manufacturing difficulty and cost of the battery cells.

[0037] In some embodiments, 0.06m ≤ D3 ≤ 0.08m. This is beneficial for further improving the volumetric energy density of energy storage devices and reducing the manufacturing cost of individual battery cells.

[0038] In some embodiments, the dimension D of the housing along its width satisfies: 0.65 ≤ D1 / D ≤ 0.99. D1 / D ≥ 0.65 ensures that the battery compartment occupies a large proportion of the housing's width, providing more space for individual battery cells and thus improving the volumetric energy density of the energy storage device. D1 / D ≤ 0.95 ensures sufficient margin in the width direction of the housing for the portion not occupied by the battery compartment, resulting in adequate structural strength.

[0039] In some embodiments, 0.75 ≤ D1 / D ≤ 0.92. This balances the requirements of volumetric energy density of the energy storage device and structural strength of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device and further improving the structural strength of the enclosure.

[0040] In some embodiments, 1.5m ≤ D ≤ 3.5m. D ≥ 1.5m results in a larger dimension of the housing along its width, allowing for a larger battery compartment along the width of the housing. This increases the proportion of the battery compartment within the housing along its width, thus improving the volumetric energy density of the energy storage device. L ≤ D ≤ 3.5m ensures that the housing dimension along its width is not excessively large, facilitating the handling and transportation of the energy storage device.

[0041] In some embodiments, 2m ≤ D ≤ 3m. This can further balance the volumetric energy density of the energy storage device and the ease of handling and transportation of the energy storage device.

[0042] In some embodiments, the battery compartment contains multiple battery cells arranged along the height direction of the housing. The dimension of the battery compartment along the height direction is H1, and the sum of the dimensions of the outer shells of the multiple battery cells arranged within the battery compartment is H2, satisfying: 0.6 ≤ H2 / H1 ≤ 0.95. H2 / H1 ≥ 0.6 ensures that the outer shells of the multiple battery cells arranged along the height direction constitute a large proportion of the battery compartment's dimensions along the height direction. This fully utilizes the space of the battery compartment along the height direction, reduces the gap between the outer shells of adjacent battery cells along the height direction, and helps increase the volumetric energy density of the energy storage device by increasing the volumetric volumetric energy of all battery cell outer shells within the battery compartment. H2 / H1 ≤ 0.95 ensures that the battery compartment has sufficient installation margin for multiple battery cells along the height direction, reducing the difficulty of installing the battery cells.

[0043] In some embodiments, 0.7 ≤ H2 / H1 ≤ 0.9. This balances the volumetric energy density of the energy storage device with the ease of installation of individual battery cells in the height direction of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installing individual battery cells in the height direction of the enclosure.

[0044] In some embodiments, the outer casing of each battery cell has a dimension of H3 along the height direction of the housing, and N4 battery cells are arranged in the battery compartment, satisfying: H2 = H3 * N4. This ensures that the outer casing dimensions of multiple battery cells are equal along the height direction of the housing, effectively reducing the probability of wasted space due to differences in the outer casing dimensions of the battery cells along the height direction. During assembly, multiple battery cells of the same specification can be arranged along the height direction of the housing, improving the assembly efficiency of the energy storage device and reducing its manufacturing cost.

[0045] In some embodiments, 0.07 ≤ H3 / H1 ≤ 0.12. H3 / H1 ≥ 0.07 ensures that the battery cell casing accounts for a larger proportion of the battery compartment's dimensions along the height of the housing. Given a fixed size of the battery compartment along the height of the housing, this reduces the number of battery cells that can be accommodated within the compartment, decreasing the probability of reduced usable space due to an excessive number of battery cells, thus improving the volumetric energy density of the energy storage device. H3 / H1 ≤ 0.12 ensures that the battery cell casing does not account for an excessively large proportion of the battery compartment's dimensions along the height of the housing, effectively reducing the manufacturing difficulty and cost of the battery cells.

[0046] In some embodiments, 0.08 ≤ H3 / H1 ≤ 0.1. This is beneficial for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of individual battery cells.

[0047] In some embodiments, 0.17m ≤ H3 ≤ 0.6m. H3 ≥ 0.17m results in a larger dimension of the battery cell's casing along the height of the housing, which is beneficial for increasing the proportion of the battery cell's casing within the battery compartment along the height of the housing, and thus improving the volumetric energy density of the energy storage device. H3 ≤ 0.6m ensures that the battery cell's casing is not excessively large along the height of the housing, effectively reducing the manufacturing difficulty and cost of the battery cells.

[0048] In some embodiments, 0.2m ≤ H3 ≤ 0.45m. This is beneficial for further improving the volumetric energy density of energy storage devices and reducing the manufacturing cost of individual battery cells.

[0049] In some embodiments, the dimension H of the housing along its height direction satisfies: 0.55 ≤ H1 / H ≤ 0.85. H1 / H ≥ 0.55 ensures that the battery compartment occupies a large proportion of the housing's height, providing more space for individual battery cells and thus improving the volumetric energy density of the energy storage device. H1 / H ≤ 0.85 ensures sufficient margin in the height direction of the housing for the portion not occupied by the battery compartment, resulting in adequate structural strength for the housing.

[0050] In some embodiments, 0.65 ≤ H1 / H ≤ 0.78. This balances the requirements of volumetric energy density of the energy storage device and structural strength of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device and further improving the structural strength of the enclosure.

[0051] In some embodiments, 1.5m ≤ H ≤ 3.5m. H ≥ 1.5m results in a larger dimension of the housing along the height direction, allowing for a larger battery compartment along the height direction, which is beneficial for increasing the proportion of the battery compartment in the housing along the height direction and thus improving the volumetric energy density of the energy storage device. H ≤ 3.5m ensures that the dimension of the housing along the height direction is not excessively large, facilitating the handling and transportation of the energy storage device.

[0052] In some embodiments, 2m ≤ H ≤ 3m. This further balances the volumetric energy density of the energy storage device with the ease of handling and transportation of the energy storage device.

[0053] In some embodiments, the battery compartment contains at least one battery, which comprises multiple battery cells. During assembly, the multiple battery cells can be assembled into a battery first, and then the battery can be installed in the battery compartment. The battery composed of multiple battery cells has a larger volume, is easier to install in the battery compartment, and has high assembly efficiency.

[0054] In some embodiments, the battery compartment houses multiple batteries arranged along the length of the housing. The dimension of the battery compartment along the length of the housing is L1, and the sum of the dimensions of the multiple batteries arranged within the battery compartment is L4, satisfying: 0.7 ≤ L4 / L1 ≤ 0.96. The battery compartment houses multiple batteries arranged along the length of the housing, ensuring that the dimension of a single battery along the length of the housing is not excessively large, reducing the manufacturing and installation difficulty of the batteries. L4 / L1 ≥ 0.7 ensures that the multiple batteries arranged along the length of the housing constitute a large proportion of the battery compartment's dimension along the length of the housing, fully utilizing the space of the battery compartment along the length of the housing, reducing the gap between adjacent batteries along the length of the housing, which is beneficial for increasing the volume proportion of all batteries in the battery compartment and improving the volumetric energy density of the energy storage device. L4 / L1 ≤ 0.96 ensures that the battery compartment has sufficient installation margin along the length of the housing for installing multiple batteries, reducing the difficulty of battery installation.

[0055] In some embodiments, 0.78 ≤ L4 / L1 ≤ 0.91. This balances the volumetric energy density of the energy storage device with the ease of battery installation along the length of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device while further reducing the difficulty of battery installation along the length of the enclosure.

[0056] In some embodiments, each battery has a size of L5 along the length of the housing, and N5 batteries are arranged in the battery compartment, satisfying L4 = L5 * N5. This ensures that the dimensions of multiple batteries along the length of the housing are equal, effectively reducing the probability of wasted space due to differences in battery dimensions along the length of the housing. During assembly, multiple batteries of the same specification can be arranged along the length of the housing, improving the assembly efficiency of the energy storage device and reducing its manufacturing cost.

[0057] In some embodiments, 1m≤L5≤1.5m, 2≤N5≤6. In this way, the size of each battery is relatively large along the length of the housing, and the number of batteries is not too large. This can reduce the space occupied by other components in the battery besides the individual battery cells, and help to increase the size ratio of multiple batteries arranged along the length of the housing within the battery compartment along the length of the housing.

[0058] In some embodiments, the battery compartment accommodates only one battery along the length of the housing. The size of the battery compartment is L1, and the size of the battery is L5, satisfying: 0.8 ≤ L5 / L1 ≤ 0.99. Accommodating only one battery along the length of the housing improves the utilization of the space within the battery compartment. L5 / L1 ≥ 0.8 ensures a larger proportion of the battery's size within the housing along its length, maximizing the use of space and increasing the overall volumetric energy density of the energy storage device. L5 / L1 ≤ 0.99 provides sufficient installation margin for the battery along its length, reducing installation difficulty.

[0059] In some embodiments, 0.85 ≤ L5 / L1 ≤ 0.93. This balances the volumetric energy density of the energy storage device with the ease of battery installation along the length of the casing, which is beneficial for improving the volumetric energy density of the energy storage device while further reducing the difficulty of battery installation along the length of the casing.

[0060] In some embodiments, 4m≤L5≤8m. L5≥4m results in a larger battery dimension along the length of the casing, allowing for the arrangement of more battery cells along the length of the casing, which can meet the high energy requirements of the energy storage device; L5≤8m ensures that the battery dimension along the length of the casing is not too large, reducing the difficulty of battery manufacturing and installation.

[0061] In some embodiments, 5.5m ≤ L5 ≤ 6.8m. This balances the requirements of high energy storage capacity with the economy and ease of installation of batteries.

[0062] In some embodiments, the battery compartment houses multiple batteries arranged along the width direction of the housing. The dimension of the battery compartment along the width direction is D1, and the sum of the dimensions of the multiple batteries arranged within the battery compartment is D4, satisfying: 0.7 ≤ D4 / D1 ≤ 0.96. The battery compartment houses multiple batteries arranged along the width direction of the housing, ensuring that the dimension of a single battery along the width direction of the housing is not excessively large, reducing the manufacturing and installation difficulty of the batteries. D4 / D1 ≥ 0.7 ensures that the multiple batteries arranged along the width direction of the housing constitute a large proportion of the battery compartment's dimensions along the width direction, fully utilizing the space of the battery compartment in the width direction of the housing, reducing the gap between adjacent batteries in the width direction of the housing, which is beneficial for increasing the volume proportion of all batteries in the battery compartment and improving the volumetric energy density of the energy storage device. D4 / D1 ≤ 0.96 ensures that the battery compartment has sufficient installation margin in the width direction of the housing for installing multiple batteries, reducing the difficulty of battery installation.

[0063] In some embodiments, 0.78 ≤ D4 / D1 ≤ 0.91. This balances the volumetric energy density of the energy storage device with the ease of battery installation in the width direction of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device and further reduces the difficulty of battery installation in the width direction of the enclosure.

[0064] In some embodiments, each battery has a dimension of D5 along the width direction of the housing, and N6 batteries are arranged in the battery compartment, satisfying: D4 = D5 * N6. This ensures that the dimensions of multiple batteries along the width direction of the housing are equal, effectively reducing the probability of wasted space due to differences in battery dimensions along the width direction. During assembly, multiple batteries of the same specification can be arranged along the width direction of the housing, improving the assembly efficiency of the energy storage device and reducing its manufacturing cost.

[0065] In some embodiments, 1m≤D5≤1.5m, 2≤N6≤3. In this way, the size of each battery is relatively large along the width direction of the housing, and the number of batteries is not too large. This can reduce the space occupied by other components in the battery besides the individual battery cells, and help to increase the size ratio of multiple batteries arranged along the width direction of the housing in the battery compartment along the width direction of the housing.

[0066] In some embodiments, the battery compartment accommodates only one battery along the width direction of the housing. The size of the battery compartment is D1, and the size of the battery is D5, satisfying: 0.8 ≤ D5 / D1 ≤ 0.99. Accommodating only one battery along the width direction of the housing improves the utilization rate of the space within the battery compartment. D5 / D1 ≥ 0.8 ensures a larger proportion of the battery's size within the housing along the width direction, maximizing the use of the space and increasing the volumetric energy density of the energy storage device. D5 / D1 ≤ 0.99 provides sufficient installation margin for the battery in the width direction, reducing installation difficulty.

[0067] In some embodiments, 0.85 ≤ D5 / D1 ≤ 0.93. This balances the volumetric energy density of the energy storage device with the ease of battery installation in the width direction of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device and further reduces the difficulty of battery installation in the width direction of the enclosure.

[0068] In some embodiments, 1.5m ≤ D5 ≤ 2.5m. D5 ≥ 1.5m results in a larger battery dimension along the width of the casing, allowing for the arrangement of more battery cells along the width of the casing, which can meet the high energy requirements of the energy storage device; D5 ≤ 2.5m ensures that the battery dimension along the width of the casing is not too large, reducing the difficulty of battery manufacturing and installation.

[0069] In some embodiments, 1.7m ≤ D5 ≤ 2.3m. This balances the requirements of high energy storage capacity with the economy and ease of installation of batteries.

[0070] In some embodiments, the battery compartment houses multiple batteries arranged along the height direction of the housing. The dimension of the battery compartment along the height direction is H1, and the sum of the dimensions of the multiple batteries arranged within the battery compartment is H4, satisfying: 0.6 ≤ H4 / H1 ≤ 0.99. The battery compartment housing multiple batteries along the height direction prevents the dimension of a single battery along the height direction from becoming excessively large, reducing the manufacturing and installation difficulty of the batteries. H4 / H1 ≥ 0.6 ensures that the multiple batteries arranged along the height direction constitute a large proportion of the battery compartment's dimensions along the height direction, fully utilizing the space of the battery compartment in the height direction, reducing the gap between adjacent batteries in the height direction, which is beneficial for increasing the volume proportion of all batteries in the battery compartment and improving the volumetric energy density of the energy storage device. H4 / H1 ≤ 0.99 ensures that the battery compartment has sufficient installation margin in the height direction for installing multiple batteries, reducing the difficulty of battery installation.

[0071] In some embodiments, 0.7 ≤ H4 / H1 ≤ 0.92. This balances the volumetric energy density of the energy storage device with the ease of battery installation in the height direction of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device and further reducing the difficulty of battery installation in the height direction of the enclosure.

[0072] In some embodiments, each battery has a size of H5 along the height direction of the housing, and N7 batteries are arranged in the battery compartment, satisfying: H4 = H5 * N7. This ensures that the dimensions of multiple batteries are equal along the height direction of the housing, effectively reducing the probability of wasted space due to differences in battery dimensions along the height direction. During assembly, multiple batteries of the same specification can be arranged along the height direction of the housing, improving the assembly efficiency of the energy storage device and reducing its manufacturing cost.

[0073] In some embodiments, 0.2m≤H5≤0.3m, 2≤N7≤10. In this way, the size of each battery is relatively large along the height direction of the housing, and the number of batteries is not too large. This can reduce the space occupied by other components in the battery besides the individual battery cells, which is beneficial to increasing the size ratio of multiple batteries arranged along the height direction of the housing in the battery compartment along the height direction of the housing.

[0074] In some embodiments, the battery compartment accommodates only one battery along the height direction of the housing. The size of the battery compartment is H1, and the size of the battery is H5, satisfying: 0.8 ≤ H5 / H1 ≤ 0.99. Accommodating only one battery along the height direction of the housing improves the utilization rate of the space within the battery compartment. H5 / H1 ≥ 0.8 ensures a larger proportion of the battery's size within the housing along the height direction, maximizing the use of the space and increasing the volumetric energy density of the energy storage device. H5 / H1 ≤ 0.99 provides sufficient installation margin for the battery in the height direction, reducing installation difficulty.

[0075] In some embodiments, 0.85 ≤ H5 / H1 ≤ 0.93. This balances the volumetric energy density of the energy storage device with the ease of battery installation in the height direction of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device and further reducing the difficulty of battery installation in the height direction of the enclosure.

[0076] In some embodiments, 1.5m ≤ H5 ≤ 2.5m. H5 ≥ 1.5m results in a larger size of the battery along the height of the casing, and a larger size of the individual battery cells along the height of the casing, which can meet the high energy requirements of the energy storage device; H5 ≤ 2.5m prevents the battery from becoming too large along the height of the casing, reducing the difficulty of battery manufacturing and installation.

[0077] In some embodiments, 1.7m ≤ H5 ≤ 2.3m. This balances the requirements of high energy storage capacity with the economy and ease of installation of batteries.

[0078] In some embodiments, the battery compartment includes multiple sub-compartments arranged along the length of the housing, each sub-compartment containing at least one battery. Dividing the battery compartment into multiple sub-compartments, each capable of holding a battery, allows for more regular placement of the batteries within the battery compartment, facilitating battery installation.

[0079] In some embodiments, the volume of the sub-compartment is V4, and the sum of the volumes of the batteries within the sub-compartment is V5, satisfying: 0.75 ≤ V5 / V4 ≤ 0.95. V5 / V4 ≥ 0.75 ensures that the volume ratio of all batteries within the sub-compartment is relatively large, thereby improving the space utilization of the sub-compartment and contributing to higher volumetric energy density of the energy storage device. V5 / V4 ≤ 0.95 prevents the volume ratio of all batteries within the sub-compartment from becoming excessively large, reducing the assembly precision requirements for battery placement within the sub-compartment and effectively controlling the manufacturing cost of the energy storage device within a reasonable range.

[0080] In some embodiments, 0.82 ≤ V5 / V4 ≤ 0.9. This balances the volumetric energy density requirements and economic requirements of energy storage devices, which helps to further reduce the manufacturing cost of energy storage devices and improve their volumetric energy density.

[0081] In some embodiments, the sub-compartment accommodates only one battery along the length of the housing. This is beneficial for increasing the proportion of batteries within the sub-compartment along the length of the housing and for improving the utilization rate of the space in the sub-compartment along the length of the housing.

[0082] In some embodiments, along the length of the housing, the sub-compartment has a dimension of L6, and the battery has a dimension of L5, satisfying: 0.85 ≤ L5 / L6 ≤ 0.99. L5 / L6 ≥ 0.85 ensures that the battery's size within the sub-compartment along the length of the housing is relatively large, fully utilizing the sub-compartment's space and maximizing the volumetric energy density of the energy storage device. L5 / L6 ≤ 0.99 provides sufficient installation margin for the sub-compartment along the length of the housing, reducing the difficulty of battery installation.

[0083] In some embodiments, 0.88≤L5 / L6≤0.95. This balances the volumetric energy density of the energy storage device with the ease of battery installation along the length of the enclosure, which is beneficial for improving the volumetric energy density of the energy storage device while further reducing the difficulty of battery installation along the length of the enclosure.

[0084] In some embodiments, the sub-compartment accommodates only one battery along the width of the housing. This is beneficial for increasing the proportion of batteries within the sub-compartment along the width of the housing, and for improving the utilization rate of the space in the sub-compartment along the width of the housing.

[0085] In some embodiments, a sub-compartment houses multiple batteries along the height of the housing. This reduces the size of a single battery in the height direction of the housing, thereby reducing the difficulty and cost of battery manufacturing.

[0086] In some embodiments, the number of sub-compartments is less than or equal to four. This reduces the number of separating components between adjacent sub-compartments within the battery compartment, minimizing the space occupied by these components and providing more space for the battery, thus improving the space utilization rate of the battery compartment.

[0087] In some embodiments, the volume of the battery is V6, and the sum of the volumes of the casings of the multiple battery cells is V7, satisfying: 0.5 ≤ V7 / V6 ≤ 0.8. V7 / V6 ≥ 0.5 ensures that the volume proportion of all battery cells in the battery is relatively large, improving the utilization rate of the battery's internal space and thus increasing the volumetric energy density of the battery, thereby improving the volumetric energy density of the energy storage device. V7 / V6 ≤ 0.8 prevents the volume proportion of all battery cells in the battery from being too large, providing more space for other battery components and reducing the assembly difficulty and manufacturing cost of the battery.

[0088] In some embodiments, 0.58 ≤ V7 / V6 ≤ 0.7. This balances the requirements of battery volumetric energy density, economy, and ease of assembly. It is beneficial for further improving battery volumetric energy density and reducing battery assembly difficulty and manufacturing cost.

[0089] In some embodiments, the number of battery cells is N8, and the volume of the casing of each battery cell is V3, satisfying: V7 = V3 * N8. This ensures that the casing volumes of all battery cells are equal, allowing the use of battery cells of the same specification. On the one hand, this improves battery assembly efficiency; on the other hand, it reduces the probability of wasted space due to different specifications of the battery cells.

[0090] In some embodiments, the battery comprises p*q battery cells arranged in p rows and q columns. Each row of battery cells is positioned along the length of the housing, and each column is positioned along the width of the housing, where p and q are both positive integers. This arrangement of all battery cells in a rectangular array improves the space utilization of the battery.

[0091] In some embodiments, in each row of battery cells, the sum of the dimensions of the casings of q battery cells along the length of the casing is L7, and the dimension of the battery along the length of the casing is L5, satisfying: 0.8 ≤ L7 / L5 ≤ 0.95. L7 / L5 ≥ 0.8 ensures that the casing of each row of battery cells accounts for a large proportion of the battery's dimensions along the length of the casing, fully utilizing the space of the battery along the length of the casing and reducing the gap between adjacent battery cell casings along the length of the casing. This is beneficial for increasing the volumetric energy density of the battery by improving the overall volumetric energy of the battery's casings. L7 / L5 ≤ 0.95 prevents the casing of each row of battery cells from accounting for an excessively large proportion of the battery's dimensions along the length of the casing, reducing the manufacturing difficulty and cost of the battery.

[0092] In some embodiments, 0.85 ≤ L7 / L5 ≤ 0.9. This balances the battery's volumetric energy density, ease of manufacturing, and economic requirements. It is beneficial for further improving the battery's volumetric energy density while reducing manufacturing difficulty and cost.

[0093] In some embodiments, along the length of the housing, the size of the casing of each battery cell is L3, satisfying: L3 = L7 / q, 0.17m ≤ L3 ≤ 0.6m, 1 ≤ q ≤ 5. L3 = L7 / q ensures that the casing size of the battery cells in each row is equal along the length of the housing, allowing for the selection of battery cells of the same specifications in each row. The conditions 0.17m ≤ L3 ≤ 0.6m and 1 ≤ q ≤ 5 result in a larger size for each battery cell in each row, while minimizing the number of batteries. This reduces the space occupied by the casing along the length of the housing, increasing the proportion of the casing size in the battery's length and thus improving space utilization and volumetric energy density.

[0094] In some embodiments, q = 4, 0.2m ≤ L3 ≤ 0.3m. When there are four battery cells in each row, the size of the battery cell casing is controlled within the range of 0.2m to 0.3m, so that the battery has a high volumetric energy density.

[0095] In some embodiments, q = 2, 0.4m ≤ L3 ≤ 0.6m. When there are two battery cells in each row, the size of the battery cell casing is controlled within the range of 0.4m ≤ L3 ≤ 0.6m, so that the battery has a high volumetric energy density.

[0096] In some embodiments, in each row of battery cells, the sum of the dimensions of the casings of the p battery cells along the width direction of the casing is D7, and the dimension of the battery along the width direction of the casing is D5, satisfying: 0.75≤D7 / D5≤0.95. D7 / D5≥0.75 ensures that the casing of each row of battery cells accounts for a large proportion of the battery's dimension along the width direction of the casing, fully utilizing the space of the battery in the width direction of the casing and reducing the gap between adjacent battery cell casings in the width direction of the casing. This is beneficial for increasing the volume ratio of the casings of all battery cells within the battery, and thus improving the volumetric energy density of the battery. D7 / D5≤0.95 prevents the casing of each row of battery cells from accounting for an excessively large proportion of the battery's dimension along the width direction of the casing, reducing the manufacturing difficulty and cost of the battery.

[0097] In some embodiments, 0.82 ≤ D7 / D5 ≤ 0.9. This balances the battery's volumetric energy density, ease of manufacturing, and economic requirements. It is beneficial for further improving the battery's volumetric energy density while reducing manufacturing difficulty and cost.

[0098] In some embodiments, the outer casing of each battery cell has a dimension D3 along the width direction of the casing, satisfying: D3 = D7 / p, 0.04m ≤ D3 ≤ 0.12m, 20 ≤ p ≤ 30. D3 = D7 / p ensures that the outer casing dimensions of the battery cells in each row are equal along the width direction of the casing, allowing for the selection of battery cells of the same specification in each row. The conditions 0.04m ≤ D3 ≤ 0.12m and 20 ≤ p ≤ 30 ensure that each battery cell in each row has a relatively large size, while maintaining a reasonable number of cells. This reduces the space occupied by the casing walls along the width direction of the casing, increasing the proportion of the outer casing dimensions of each row of battery cells within the casing's width direction. This improves the space utilization rate of the battery and thus increases its volumetric energy density.

[0099] In some embodiments, 0.06m ≤ D3 ≤ 0.08m, 24 ≤ p ≤ 28. Such batteries have high volumetric energy density.

[0100] In some embodiments, the dimension of the battery cell's casing along the height direction of the casing is H3, and the dimension of the battery along the height direction of the casing is H5, satisfying: 0.75 ≤ H3 / H5 ≤ 0.95. H3 / H5 ≥ 0.75 ensures that the battery cell's casing accounts for a large proportion of the battery's dimensions along the height direction of the casing, fully utilizing the space of the battery in the height direction of the casing. This is beneficial for increasing the volume ratio of the casings of all battery cells within the battery, and thus improving the battery's volumetric energy density. H3 / H5 ≤ 0.95 prevents the battery cell's casing from accounting for an excessively large proportion of the battery's dimensions along the height direction of the casing, reducing the battery's manufacturing difficulty and cost.

[0101] In some embodiments, 0.82 ≤ H3 / H5 ≤ 0.9. This balances the requirements for battery volumetric energy density, ease of manufacturing, and economic viability. It is beneficial for further improving battery volumetric energy density while reducing manufacturing difficulty and cost.

[0102] In some embodiments, 0.17m ≤ H3 ≤ 0.6m. H3 ≥ 0.17m results in a larger dimension of the battery cell's casing along the height of the casing, which is beneficial for increasing the proportion of the battery cell's casing in the battery's overall dimensions along the casing height, and thus improving the volumetric energy density of the battery cell. H3 ≤ 0.6m prevents the battery cell's casing from becoming excessively large along the casing height, effectively reducing the manufacturing difficulty and cost of the battery cell.

[0103] In some embodiments, 0.2m ≤ H3 ≤ 0.45m. This balances the requirements of battery volumetric energy density, ease of manufacturing, and economic viability. It is beneficial for further improving battery volumetric energy density while reducing manufacturing difficulty and cost.

[0104] In some embodiments, the battery cell further includes at least one electrode assembly housed within a housing; the housing is in the shape of a right parallelepiped, with a dimension W1 in a first direction, a dimension T1 in a second direction, and a dimension K1 in a third direction. One of the three directions (first, second, and third) is parallel to the length direction of the housing, another is parallel to the width direction of the housing, and the third is parallel to the height direction of the housing; the housing includes a first wall and a second wall disposed opposite to each other along the first direction, a third wall and a fourth wall disposed opposite to each other along the second direction, and a fifth wall and a sixth wall disposed opposite to each other along the third direction. The sum of the thicknesses of the first and second walls is a, the sum of the thicknesses of the third and fourth walls is b, and the sum of the thicknesses of the fifth and sixth walls is c, satisfying: (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≥0.9. In such a battery cell, the ratio of the internal space volume of the battery cell to the volume of the outer casing is greater than 0.9, which makes the internal space of the outer casing account for a large proportion. This increases the space available in the outer casing to accommodate the electrode components, and under the same chemical system, the volumetric energy density of the battery cell can be improved.

[0105] In some embodiments, (W1-a) / W1≥0.97, (T1-b) / T1≥0.965, and (K1-c) / K1≥0.965. This increases the dimensional proportion of the internal space of the casing in three directions, further improving the volumetric energy density of the battery cell.

[0106] In some embodiments, the housing includes a casing and an end cap. The casing has an opening, and the end cap closes to the opening. The end cap is provided with electrode terminals. The casing includes an integrally formed first wall, a second wall, a third wall, a fourth wall, and a fifth wall, and the end cap is a sixth wall. When assembling the battery, the electrode terminals can be installed on the end cap first, then the electrode assembly can be housed in the casing, and finally the end cap can be closed to the opening of the casing. This reduces the difficulty of installing the electrode assembly into the casing and the difficulty of installing the electrode terminals into the casing.

[0107] In some embodiments, the battery cell further includes a first insulating member and a second insulating member. The first insulating member is disposed between the fifth wall and the electrode assembly and abuts against the fifth wall; the second insulating member is disposed between the sixth wall and the electrode assembly and abuts against the sixth wall. The maximum dimension of the first insulating member in the third direction is e1, and the maximum dimension of the second insulating member in the third direction is e2, satisfying: (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e1-e2) / (W1*T1*K1)≥0.88, 0.3mm≤e1≤1.2mm, and 2mm≤e2≤10mm. This increases the internal space of the casing for the electrode assembly, allowing for the accommodation of a larger electrode assembly, thereby further improving the volumetric energy density of the battery cell.

[0108] In some embodiments, the battery cell further includes a first insulating member and a second insulating member. The first insulating member is disposed between the fifth wall and the electrode assembly and abuts against the fifth wall; the second insulating member is disposed between the sixth wall and the electrode assembly and abuts against the sixth wall. The maximum dimension of the first insulating member in the third direction is e1, and the maximum dimension of the second insulating member in the third direction is e2, satisfying: (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1)≥0.85, 0.3mm≤e1≤1.2mm, and 2mm≤e2≤10mm. This increases the internal space of the casing for the electrode assembly, allowing for the accommodation of a larger electrode assembly, thereby further improving the volumetric energy density of the battery cell.

[0109] In some embodiments, W1≥T1, the first direction is parallel to the length direction of the housing, the second direction is parallel to the width direction of the housing, and the third direction is parallel to the height direction of the housing. When the housing has an end cap at only one end and W1≥T1, setting the end cap and the fifth wall of the housing opposite each other along the height direction of the housing, setting the first and second walls of the housing opposite each other along the length direction of the housing, and setting the third and fourth walls of the housing opposite each other along the width direction of the housing helps to increase the volume ratio of all battery cells in the battery compartment.

[0110] In some embodiments, the housing includes a housing and two end caps. The housing has two openings disposed opposite each other in a third direction. The two end caps respectively cover the two openings. At least one end cap is provided with an electrode terminal. The housing includes an integrally formed first wall, a second wall, a third wall, and a fourth wall. The two end caps are a fifth wall and a sixth wall, respectively.

[0111] In some embodiments, the battery cell further includes a third insulating member and a fourth insulating member. The third insulating member is disposed between the fifth wall and the electrode assembly and abuts against the fifth wall; the fourth insulating member is disposed between the sixth wall and the electrode assembly and abuts against the sixth wall. The maximum dimension of the third insulating member in the third direction is e3, and the maximum dimension of the fourth insulating member in the third direction is e4, satisfying: (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e3-e4) / (W1*T1*K1)≥0.88, 2mm≤e3≤10mm, and 2mm≤e4≤10mm. This increases the space left inside the casing for the electrode assembly, allowing for the accommodation of a larger electrode assembly, thereby further improving the volumetric energy density of the battery cell.

[0112] In some embodiments, the battery cell further includes a third insulating member and a fourth insulating member. The third insulating member is disposed between the fifth wall and the electrode assembly and abuts against the fifth wall; the fourth insulating member is disposed between the sixth wall and the electrode assembly and abuts against the sixth wall. The maximum dimension of the third insulating member in the third direction is e3, and the maximum dimension of the fourth insulating member in the third direction is e4, satisfying: (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1)≥0.85, 2mm≤e3≤10mm, and 2mm≤e4≤10mm. This increases the space left inside the casing for the electrode assembly, allowing for a larger electrode assembly to be accommodated, thereby further improving the volumetric energy density of the battery cell.

[0113] In some embodiments, W1≥T1, the first direction is parallel to the height direction of the housing, the second direction is parallel to the width direction of the housing, and the third direction is parallel to the length direction of the housing. When end caps are provided at both ends of the housing and W1≥T1, arranging the two end caps along the length direction of the housing, arranging the first and second walls along the height direction of the housing, and arranging the third and fourth walls opposite each other along the width direction of the housing helps to increase the volume ratio of all battery cells within the battery compartment.

[0114] In some embodiments, the positive electrode material of the battery cell includes lithium phosphate, and the capacity of the battery cell is C, satisfying: C≥350Ah, C / (W1-a)*(T1-b)*(K1-c)≥118Ah / L. When the positive electrode material of the battery cell includes lithium phosphate and C≥350Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) above 118Ah / L can increase the volume ratio of the internal space of the battery cell casing, which is beneficial to achieving a ratio of internal space volume to casing volume of the battery cell casing of 0.9 or higher.

[0115] In some embodiments, the positive electrode material of the battery cell includes lithium transition metal oxide, and the capacity of the battery cell is C, satisfying: C≥650Ah, C / ((W1-a)*(T1-b)*(K1-c))≥190Ah / L. When the positive electrode material of the battery cell includes lithium transition metal oxide and C≥650Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) above 190Ah / L can increase the volume ratio of the internal space of the battery cell casing, which is beneficial to achieving a ratio of internal space volume to casing volume of the battery cell casing of 0.9 or higher.

[0116] In some embodiments, the battery cell is a sodium-ion battery cell with a capacity C that satisfies: C ≥ 260 Ah, C / ((W1-a)*(T1-b)*(K1-c)) ≥ 87 Ah / L. When the battery cell is a sodium-ion battery cell and C ≥ 260 Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) above 87 Ah / L can increase the volume ratio of the internal space of the battery cell's casing, which is beneficial for achieving a ratio of internal space volume to casing volume of 0.9 or higher. Attached Figure Description

[0117] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0118] Figure 1 Axonometric views of energy storage devices provided in some embodiments of this application;

[0119] Figure 2 for Figure 1 The diagram shows the structure of the energy storage device.

[0120] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the energy storage device.

[0121] Figure 4 for Figure 2 The diagram shows the structure of the box.

[0122] Figure 5 Exploded views of individual battery cells provided in some embodiments of this application;

[0123] Figure 6 Exploded views of a battery cell provided in other embodiments of this application;

[0124] Figure 7 This is a schematic diagram of the structure of an energy storage device provided in some embodiments of this application;

[0125] Figure 8 for Figure 7 The diagram shows a BB cross-sectional view of the energy storage device.

[0126] Figure 9 Exploded views of batteries are provided for some embodiments of this application;

[0127] Figure 10 Schematic diagrams of the structure of the energy storage device provided in some embodiments of this application;

[0128] Figure 11 for Figure 10 The image shows a CC cross-sectional view of the energy storage device.

[0129] Figure 12 Cross-sectional views of an energy storage device provided in some embodiments of this application;

[0130] Figure 13 Structural views of an energy storage device provided in some embodiments of this application;

[0131] Figure 14 for Figure 13 The diagram shows the structure of the box.

[0132] Figure 15 for Figure 13 The diagram shows a DD cross-sectional view of the energy storage device.

[0133] Figure 16 This application provides schematic diagrams of the battery structure for some embodiments.

[0134] Figure 17 for Figure 16 The battery shown is an EE cross-sectional view;

[0135] Figure 18 Axonometric views of a single battery cell provided in some embodiments of this application;

[0136] Figure 19 for Figure 18 The exploded view of the battery cell shown;

[0137] Figure 20 for Figure 18 The exploded cross-sectional view of the battery cell shown is taken along the UW plane.

[0138] Figure 21 for Figure 18 The exploded cross-sectional view of the battery cell shown is taken along the VW plane.

[0139] Figure 22 Axonometric views of a battery cell provided for other embodiments of this application;

[0140] Figure 23 for Figure 22 The exploded view of the battery cell shown;

[0141] Figure 24 for Figure 22 The exploded cross-sectional view of the battery cell shown is taken along the UW plane.

[0142] Figure 25 for Figure 22 The exploded cross-sectional view of the battery cell shown is taken along the VW plane.

[0143] Icons: 1-Box; 11-Battery compartment; 111-Sub-compartment; 112-Separator; 113-Support; 13-Thermal management compartment; 15-Main control compartment; 2-Battery; 21-Battery cell; 211-Outer casing; 2111-Shell; 2112-End cap; 2112a-Outer surface of end cap; 2112b-Protrusion; 2113-First wall; 2114-Second wall; 2115-Third wall; 2116-Fourth wall; 2117-Fifth wall; 2118- Sixth wall; 212-Electrode terminal; 213-Electrode assembly; 2131-Electrode tab; 214-First insulating component; 215-Second insulating component; 216-Third insulating component; 217-Fourth insulating component; 22-Battery box; 221-First part; 222-Second part; 23-Buffer component; 10-Energy storage device; U-First direction; V-Second direction; W-Third direction; X-Length direction of the box; Y-Width direction of the box; Z-Height direction of the box. Detailed Implementation

[0144] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0145] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0146] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0147] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0148] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0149] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0150] In this application, "multiple" means two or more (including two).

[0151] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0152] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0153] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0154] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0155] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0156] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0157] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more.

[0158] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0159] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0160] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0161] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0162] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0163] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0164] In some implementations, the electrode assembly is a wound structure.

[0165] In some implementations, the electrode assembly is a stacked structure.

[0166] An energy storage device is a device that integrates multiple battery cells within a casing. These cells can be connected in series, parallel, or a combination of different cells to store electrical energy. Energy storage devices can be used in power systems to store surplus electricity during off-peak periods to supplement electricity consumption during peak periods.

[0167] For typical energy storage devices, multiple batteries are housed within the enclosure, which includes a battery box and multiple individual battery cells housed within it. The space utilization rate of all batteries within the battery compartment is low; and / or, the space utilization rate of all individual battery cells within the battery box is also low. This results in low space utilization of all individual battery cells within the battery compartment of the energy storage device, leading to a low volumetric energy density.

[0168] In view of this, the present application provides an energy storage device in which the ratio of the sum of the volumes of the casings of all battery cells in the battery compartment to the volume of the battery compartment is set in the range of 0.4 to 0.95, so that the volume ratio of the casings of all battery cells in the battery compartment is relatively large, thereby improving the space utilization of the battery compartment and improving the volumetric energy density of the energy storage device.

[0169] The specific structure of the energy storage device provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0170] Please refer to Figures 1-4 , Figure 1 Axonometric view of the energy storage device 10 provided in some embodiments of this application; Figure 2 for Figure 1 The diagram shows the structure of the energy storage device 10. Figure 3 for Figure 2 A sectional view of the energy storage device 10 shown in Figure AA; Figure 4 for Figure 2 The diagram shows the structure of the housing 1. This application provides an energy storage device 10, including a housing 1 and multiple battery cells 21. The housing 1 has a battery compartment 11, within which the multiple battery cells 21 are housed. Each battery cell 21 includes a housing 211 and electrode terminals 212, with the electrode terminals 212 disposed on the housing 211. The volume of the battery compartment 11 is V1, and the sum of the volumes of the housings 211 of all battery cells 21 within the battery compartment 11 is V2, where 0.4 ≤ V2 / V1 ≤ 0.95.

[0171] The container 1 can be a standard component conforming to international standards set by the International Organization for Standardization (ISO), or it can be a non-standard component. The container 1 can also be called a shipping container, and the energy storage device 10 can also be called an energy storage container. The container 1 can have various shapes, such as cylindrical or prismatic. Prismatic shapes can be triangular, square, pentagonal, hexagonal, etc. As an example, in... Figures 1-4 In the middle, box 1 is a quadrangular prism, specifically, box 1 is a cuboid.

[0172] The battery compartment 11 is the space inside the housing 1 used to house individual battery cells 21. The battery compartment 11 can house only individual battery cells 21, or it can house other components besides individual battery cells 21, such as fire suppression components, thermal management components, and partitions. Fire suppression components may include pipes, detectors, etc. Thermal management components may be water-cooled plates. Partitions may be plates, beams, etc. By installing partitions inside the battery compartment 11, it can be divided into multiple spaces, each space used to house individual battery cells 21. The battery compartment 11 can have various shapes, such as cylindrical or prismatic. As an example, in... Figures 1-4 In this design, the battery compartment 11 is a quadrangular prism, specifically a cuboid. Taking the cuboid shape of the battery compartment 11 as an example, at least one side of the battery compartment 11 has an opening along the width direction Y of the housing, through which the battery cell 21 can enter the battery compartment 11. A door can be correspondingly provided on the opening side of the battery compartment 11. The door can be slidably connected to the housing 1, hinged, etc., so as to open or close the opening of the battery compartment 11 by sliding or rotating.

[0173] The volume of the battery compartment 11 can be measured in several ways. For a regularly shaped battery compartment 11, taking a cuboid shape as an example, the length, width, and height of the battery compartment 11 can be measured using a measuring tool. The volume V1 of the battery compartment 11 can then be calculated using these measurements. Essentially, V1 is the product of the length, width, and height. A ruler can be used as the measuring tool. It should be noted that if all the walls of the battery compartment 11 are flat, the length, width, and height are measured using each wall as a reference. If a wall of the battery compartment 11 has a protrusion or recess, the length, width, and height are measured using the flat area of ​​that wall as a reference. For irregularly shaped battery compartments 11, it is difficult to calculate the volume by measuring the external dimensions. A filling method can be used to measure the volume of the battery compartment 11. The specific method is as follows: Fill the battery compartment 11 with plastic granules. The plastic granules can be made of PP (polypropylene) or PE (polyethylene), with a particle size of 0.5mm-1.5mm and a density of 0.94g / cm³. 3 -0.96g / cm 3 The total volume of the plastic granules in the battery compartment 11 is measured using a measuring container to obtain the volume V1 of the battery compartment 11. Alternatively, when measuring the total volume of the plastic granules, the total weight of the plastic granules in the battery compartment 11 can be measured using a weighing device, and the total mass of the plastic granules in the battery compartment 11 can be calculated. Then, according to the formula: total volume of plastic granules = total mass of plastic granules / density of plastic granules, the total volume of the plastic granules can be calculated, thus obtaining the volume V1 of the battery compartment 11.

[0174] The enclosure 1 may contain only the battery compartment 11, or it may contain additional space for other components. For example, the enclosure 1 may also include a thermal management compartment 13 and a main control compartment 15. The thermal management compartment 13 may house a water-cooled unit that provides a fluid medium for the thermal management components. The main control compartment 15 may house a main control unit for high-voltage control and communication of the multiple battery cells 21 within the battery compartment 11. The enclosure 1 is rectangular, with the battery compartment 11 and main control compartment 15 arranged along the height direction Z. The thermal management compartment 13 may be located on one side of the battery compartment 11 along the length direction X of the enclosure, and the main control compartment 15 may be located at the bottom of the battery compartment 11 along the height direction Z. In other embodiments, the enclosure 1 may also include an electrical compartment, which may house a combiner unit, a power distribution unit, and a control unit. The current combining unit is used to combine multiple battery cells 21, enabling a safe connection between the multiple battery cells 21 and the DC side of the power conversion system (PCS). The power distribution unit can draw power from the grid to power the internal control and auxiliary systems; the control unit may include battery cell management units, fire control units, etc., for monitoring and managing the internal components of the energy storage device. The electrical compartment and thermal management compartment 13 can be located on one side of the battery compartment 11 along the length X direction of the enclosure, and the electrical compartment and thermal management compartment 13 can be arranged along the width Y direction of the enclosure.

[0175] As an example, the enclosure 1 may include a frame and multiple side panels, the frame being formed by connecting multiple beams. Along the length direction X of the enclosure, two side panels are provided on each side of the frame; along the height direction Z of the enclosure, two side panels are provided on each side of the frame; along the width direction Y of the enclosure, a side panel is provided on one side of the frame, and the other side is used to install a door. The frame and five side panels together define the internal space of the enclosure 1. By placing multiple beams or panels within this space, the space can be divided into a battery compartment 11, a thermal management compartment 13, a main control compartment 15, and an electrical compartment.

[0176] In this embodiment of the application, the height direction Z of the box is parallel to the gravity direction of the box 1, the height direction Z, the width direction Y, and the length direction X of the box are perpendicular to each other, and the length of the box 1 is greater than or equal to the width of the box 1.

[0177] Multiple battery cells 21 within the battery compartment 11 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the multiple battery cells 21 are connected in series and others in parallel. Multiple battery cells 21 can be directly housed within the battery compartment 11, or they can be combined to form a battery 2, and then one or more batteries 2 can be housed within the battery compartment 11. For example, if the battery compartment 11 contains multiple batteries 2, multiple battery cells 21 can be installed in a battery box to form a battery 2, and then the multiple batteries 2 can be installed within the battery compartment 11. The multiple batteries 2 can be connected in series, parallel, or in a mixed configuration.

[0178] The battery cell 21 is the smallest energy storage unit in the energy storage device 10. The battery cell 21 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include square battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as pentagonal battery cells and hexagonal battery cells.

[0179] Please refer to Figure 5 , Figure 5 The image shows an exploded view of a battery cell 21 according to some embodiments of this application. The battery cell 21 also includes an electrode assembly 213, which is housed within a housing 211. Electrode terminals 212 are disposed on the housing 211 and are electrically connected to the electrode assembly 213.

[0180] The outer casing 211 is a component used to house the electrode assembly 213 and electrolyte, etc. The outer casing 211 can be cylindrical or prismatic. Prisms include triangular prisms, square prisms, pentagonal prisms, or hexagonal prisms, etc. Square prisms include oblique square prisms, right parallelepipeds, etc. Right parallelepipeds include cuboids, cubes, etc. As an example, the outer casing 211 may include a housing 2111 and an end cap 2112.

[0181] The shell 2111 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both opposite ends. The shell 2111 can have various shapes, such as cylindrical or prismatic. The shell 2111 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, or plastic.

[0182] End cap 2112 is a component that closes the opening of housing 2111 to isolate the internal environment of battery cell 21 from the external environment. End cap 2112 and housing 2111 together define a receiving space for accommodating electrode assembly 213, electrolyte, and other components. The shape of end cap 2112 can be adapted to the shape of housing 211. For example, if housing 2111 is cuboid, end cap 2112 can be a rectangular plate structure adapted to housing 2111; or if housing 2111 is cylindrical, end cap 2112 can be a circular plate structure adapted to housing 2111. End cap 2112 can also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, or plastic. The materials of end cap 2112 and housing 2111 can be the same or different.

[0183] In an embodiment where the housing 2111 has an opening at one end, one end cap 2112 may be provided. In an embodiment where the housing 2111 has openings at opposite ends, two end caps 2112 may be provided, with the two end caps 2112 respectively closing the two openings of the housing 2111, and the two end caps 2112 and the housing 2111 together defining the receiving space.

[0184] Electrode terminal 212 is a component in battery cell 21 used for inputting or outputting electrical energy. Electrode terminal 212 is disposed on housing 211 and is used for electrical connection with tab 2131 of electrode assembly 213. Electrode terminal 212 can be disposed on housing 2111 or end cap 2112 of housing 211. Electrode terminal 212 and tab 2131 can be directly connected, for example, by direct welding; or they can be indirectly connected through current collector, which can be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0185] As an example, such as Figure 5 As shown, the housing 2111 is a hollow structure with an opening at one end. There is only one end cap 2112 in the housing 2111. The end cap 2112 closes the opening of the housing 2111. The end cap 2112 is provided with two electrode terminals 212. The electrode terminals 212 protrude from the outer surface 2112a of the end cap. The end of the electrode assembly 213 facing the end cap 2112 has a positive electrode tab and a negative electrode tab. The positive electrode tab and the negative electrode tab are electrically connected to the two electrode terminals 212 respectively.

[0186] Taking a rectangular parallelepiped shape for both the outer casing 211 and the battery compartment 11, the outer casing 211 has a length direction, a width direction, and a height direction. The length of the outer casing 211 is greater than or equal to its width, and the electrode terminal 212 is located at one end of the outer casing 211 in the height direction. After multiple battery cells 21 are housed in the battery compartment 11, one of the three directions of the outer casing 211—length, width, and height—can be parallel to the length direction X of the housing, another parallel to the width direction Y of the housing, and the third parallel to the height direction Z of the housing.

[0187] The volumes of the outer casings 211 of all battery cells 21 within the battery compartment 11 can be equal. For example, all battery cells 21 within the battery compartment 11 can be of the same specification, meaning that all battery cells 21 have the same length, width, and height. Alternatively, the volumes of the outer casings 211 of all battery cells 21 within the battery compartment 11 can be at least two different. For example, all battery cells 21 within the battery compartment 11 can be composed of battery cells 21 of various specifications. V2 is the sum of the volumes of the outer casings 211 of all battery cells 21 within the battery compartment 11. If the volumes of the outer casings 211 of all battery cells 21 are equal, the volume of the outer casing 211 of one battery cell 21 can be measured, and then multiplied by the volume of the outer casing 211 of that battery cell 21 by the number of battery cells 21 within the battery compartment 11 to obtain V2. If the volumes of the outer shells 211 of at least two battery cells 21 in the battery compartment 11 are not equal, for example, if the outer shells 211 of all battery cells 21 in the battery compartment 11 are composed of two different volumes of outer shells 211, the volume of the outer shell 211 of the first type of battery cell 21 can be measured first, and the volume of the outer shell 211 of the first type of battery cell 21 can be multiplied by the number of the first type of battery cells 21 in the battery compartment 11 to obtain the first total volume. Then the volume of the outer shell 211 of the second type of battery cell 21 can be measured, and the volume of the outer shell 211 of the second type of battery cell 21 can be multiplied by the number of the second type of battery cells 21 in the battery compartment 11 to obtain the second total volume. The sum of the first total volume and the second total volume is V2.

[0188] The volume of the casing 211 of the battery cell 21 can be measured in various ways. For a regularly shaped casing 211, taking a cuboid shape as an example, the length, width, and height of the casing 211 can be measured using a measuring tool. The volume of the casing 211 can then be calculated from these measurements. Essentially, the product of the length, width, and height is the volume of the casing 211. A vernier caliper can be used as the measuring tool. For irregularly shaped casings 211, it is difficult to calculate the volume by measuring their external dimensions. In such cases, an immersion method can be used to measure the volume of the casing 211. The specific method is as follows: inject liquid into the measuring container and record the volume value X1 corresponding to the liquid level. Gradually immerse the battery cell 21 into the liquid until the outer surface 2112a of the end cap is flush with the liquid level. At this time, the electrode terminals 212 on the end cap 2112 are not immersed in the liquid. Record the volume value X2 corresponding to the liquid level at this time. X2-X1 is the volume of the outer shell 211 of the battery cell 21.

[0189] It should be noted that, please refer to Figure 6 , Figure 6 This is an exploded view of a battery cell 21 provided in other embodiments of this application. A protrusion 2112b is formed on the end cap 2112, protruding from the outer surface 2112a of the end cap. The volume of the outer casing 211 of the battery cell 21 does not include the volume of the protrusion 2112b. Taking the outer casing 211 of the battery cell 21 as a cuboid as an example, when measuring the height of the outer casing 211, the distance between the outer surface of the outer casing 211 away from the wall of the end cap 2112 and the outer surface 2112a of the end cap is the height of the outer casing 211. The height of the protrusion 2112b is not included in the height of the outer casing 211.

[0190] In this embodiment, V2 / V1 can be any point value or a range value between any two of the following: 0.4, 0.43, 0.5, 0.55, 0.57, 0.62, 0.67, 0.71, 0.75, 0.81, 0.85, 0.92, 0.95.

[0191] In this embodiment, V2 / V1≤0.95 ensures that the volume ratio of all battery cells 21 within the battery compartment 11 is not too large, reducing the assembly precision requirements of the energy storage device 10 and effectively controlling the manufacturing cost of the energy storage device 10 within a reasonable range. V2 / V1≥0.4 ensures that the volume ratio of all battery cells 21 within the battery compartment 11 is relatively large, thereby improving the space utilization of the battery compartment 11 and contributing to increasing the volumetric energy density of the energy storage device 10.

[0192] The following is a detailed explanation using specific experimental data:

[0193] In the experiment, a rectangular box 1 was selected, with dimensions of 6.058m (length), 2.438m (width), and 2.896m (height). The battery compartment 11 was also rectangular, and the battery cells 21 were prismatic. All battery cells 21 within the battery compartment 11 had the same specifications and belonged to the same chemical system. The positive electrode material of the battery cells 21 included lithium iron phosphate. Specific implementation data are shown in Table 1.

[0194] Table 1

[0195]

[0196] According to Table 1 above, comparing Examples 1-12 and Comparative Examples 1-2, it can be seen that when V2 / V1≥0.4, the volumetric energy density of the energy storage device 10 can be effectively improved.

[0197] In some embodiments, 0.5 ≤ V2 / V1 ≤ 0.85.

[0198] In this embodiment, V2 / V1 can be any point value or a range value between any two of the following: 0.5, 0.53, 0.55, 0.57, 0.59, 0.62, 0.65, 0.67, 0.69, 0.71, 0.73, 0.75, 0.77, 0.79, 0.81, 0.83, 0.84, 0.85.

[0199] In this embodiment, 0.5≤V2 / V1≤0.85 takes into account both the volumetric energy density and economic requirements of the energy storage device 10, which helps to further reduce the manufacturing cost of the energy storage device 10 and increase the volumetric energy density of the energy storage device 10.

[0200] In some embodiments, 0.52 ≤ V2 / V1 ≤ 0.75.

[0201] In this embodiment, V2 / V1 can be any point value of 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, or a range of values ​​between any two.

[0202] In this embodiment, 0.52≤V2 / V1≤0.75, which can control the manufacturing cost of the energy storage device 10 at a relatively low level, and at a relatively high level the volumetric energy density of the energy storage device 10.

[0203] In some embodiments, the volume of the casing 2111 of each battery cell 21 is V3, and the number of battery cells 21 in the battery compartment 11 is N1, satisfying: V2=V3*N1.

[0204] As an example, the casing 2111 of the battery cell 21 is rectangular, and the length of the casing 2111 of all battery cells 21 is equal, the width of the casing 2111 of all battery cells 21 is equal, and the height of the casing 2111 of all battery cells 21 is equal, so that the volume of the casing 211 of all battery cells 21 is equal.

[0205] Where N1 is a positive integer greater than or equal to 2. For example, 2000 ≤ N1 ≤ 5000.

[0206] In this embodiment, V2 = V3 * N1, ensuring that the outer casing 211 of all battery cells 21 in the battery compartment 11 has the same volume, allowing the selection of battery cells 21 of the same specification. On one hand, this improves the assembly efficiency of the energy storage device 10; on the other hand, it reduces the probability of wasted space due to different specifications of the battery cells 21 within the battery compartment 11.

[0207] In some embodiments, 0.0001 ≤ V3 / V1 ≤ 0.00025.

[0208] V3 / V1 can be any point value of 0.0001, 0.00012, 0.00015, 0.00017, 0.00019, 0.0002, 0.00021, 0.00023, 0.00025, or a range of values ​​between any two.

[0209] In the battery compartment 11, if the number of battery cells 21 is too large, the space occupied by the outer shell 211 of the battery cells 21 and the insulating components inside the outer shell 211 will be larger, and the effective space of the battery compartment 11 will be reduced. In this embodiment, V3 / V1≥0.0001, so that the volume ratio of the outer shell 211 of the battery cells 21 in the battery compartment 11 is relatively large. With a fixed volume of the battery compartment 11, the number of battery cells 21 can be reduced, reducing the probability of reduced usable effective space due to an excessive number of battery cells 21, which is beneficial to improving the volumetric energy density of the energy storage device 10; V3 / V1≤0.00025, so that the volume ratio of the outer shell 211 of the battery cells 21 in the battery compartment 11 is not too large, reducing the manufacturing difficulty and manufacturing cost of the battery cells 21.

[0210] In some embodiments, 0.00015 ≤ V3 / V1 ≤ 0.0002.

[0211] In this embodiment, V3 / V1 can be any one of the point values ​​of 0.00015, 0.00016, 0.00017, 0.00018, 0.00019, 0.0002, etc., or any range value between the two.

[0212] In this embodiment, 0.00015≤V3 / V1≤0.0002 takes into account the volumetric energy density of the energy storage device 10, the ease of manufacturing the battery cell 21, and the economic requirements of the battery cell 21. This is beneficial to improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing difficulty and cost of the battery cell 21.

[0213] In some embodiments, 0.0026m 3 ≤V3≤0.008m 3 .

[0214] In this embodiment, V3 can be 0.0026m 3 0.0028m 3 0.0031m 3 0.0035m 3 0.0038m 3 0.004m 3 0.0042m 3 0.0045m 3 0.0048m 3 0.005m 3 0.0052m 3 0.0055m 3 0.0058m 3 0.006m 3 0.0062m 3 0.0065m 3 0.0068m 3 0.007m 3 0.0072m 3 0.0073m 3 0.0075m 3 0.0078m 3 0.008m 3 The point value of any one of them, or the range value between any two.

[0215] In this embodiment, 0.0026m 3 ≤V3≤0.008m 3The larger volume of the outer casing 211 of the battery cell 21 prevents the number of battery cells 21 in the battery compartment 11 from becoming too large. Of course, the volume of the outer casing 211 of the battery cell 21 is also not too large, which is conducive to further improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing cost of the battery cell 21.

[0216] In some embodiments, 0.004m 3 ≤V3≤0.006m 3 .

[0217] In this embodiment, V3 can be 0.004m 3 0.0041m 3 0.0042m 3 0.0043m 3 0.0044m 3 0.0045m 3 0.0046m 3 0.0047m 3 0.0048m 3 0.0049m 3 0.005m 3 0.0051m 3 0.0052m 3 0.0053m 3 0.0054m 3 0.0055m 3 0.0056m 3 0.0057m 3 0.0058m 3 0.0059m 3 0.006m 3 The point value of any one of them or the range value between any two.

[0218] In this embodiment, 0.004m 3 ≤V3≤0.006m 3 This allows for both a relatively high volumetric energy density of the energy storage device 10 and a low manufacturing cost of the battery cell 21.

[0219] In some embodiments, the volume of the housing 1 is V, which satisfies: 0.45≤V1 / V≤0.75.

[0220] V1 / V ​​can be any point value or a range between any two of the following: 0.45, 0.48, 0.5, 0.52, 0.55, 0.58, 0.6, 0.62, 0.65, 0.68, 0.7, 0.73, 0.75.

[0221] Taking a rectangular box 1 as an example, the length, width, and height of box 1 can be measured using a measuring tool. The volume of box 1 can then be calculated from these measurements. Essentially, the product of the length, width, and height is the volume V of box 1. A ruler can be used as the measuring tool. It should be noted that if the outer surfaces of all the walls of box 1 are flat, the length, width, and height of box 1 are measured using each of these outer surfaces as a reference. If the outer surface of one of the walls of box 1 has a protrusion or recess, the length, width, and height of box 1 are measured using the flat area of ​​that outer surface as a reference.

[0222] In this embodiment, V1 / V ≥ 0.45 ensures that the volume of the battery compartment 11 accounts for a large proportion of the volume of the housing 1, increasing the usable effective space within the housing 1 and thus improving the volumetric energy density of the energy storage device 10. V1 / V ≤ 0.75 prevents the battery compartment 11 from becoming excessively large, allowing the energy storage device 10 to reserve more installation space for other components and reducing the installation difficulty of these components. These other components may include the main control unit, water-cooled unit, etc.

[0223] In some embodiments, 0.55 ≤ V1 / V ≤ 0.65.

[0224] In this embodiment, V1 / V can be any point value of 0.55, 0.56, 0.67, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, or a range value between any two.

[0225] In this embodiment, 0.55≤V1 / V≤0.65 can balance the volumetric energy density of the energy storage device 10 and the ease of installation of other components of the energy storage device 10.

[0226] In some embodiments, 20m 3 ≤V≤80m 3 .

[0227] In this embodiment, V can be 20m 3 25m 3 30m 3 35m 3 40m 3 45m 3 50m 3 55m 3 60m 3 65m 3 70m 3 75m 3 80m 3The point value of any one of them or the range value between any two.

[0228] In this embodiment, V≥20m 3 This results in a larger volume for housing 1, which is beneficial for meeting the high energy requirements of energy storage device 10, allowing it to store more electrical energy; V≤80m 3 This ensures that the volume of the housing 1 is not too large, making it easier to handle and transport the energy storage device 10.

[0229] In some embodiments, 35m 3 ≤V≤50m 3 .

[0230] In this embodiment, V can be 35m 3 36m 3 37m 3 38m 3 39m 3 40m 3 41m 3 42m 3 43m 3 44m 3 45m 3 46m 3 47m 3 48m 3 49m 3 50m 3 The point value of any one of them or the range value between any two.

[0231] In this embodiment, 35m 3 ≤V≤50m 3 This can further balance the large energy capacity of the energy storage device 10 with the convenience of handling and transportation of the energy storage device 10.

[0232] In some embodiments, please continue to refer to Figure 2 The battery compartment 11 contains multiple battery cells 21 arranged along the length X of the casing. The size of the battery compartment 11 along the length X of the casing is L1, and the sum of the sizes of the outer shells 211 of the multiple battery cells 21 arranged in the battery compartment 11 is L2, satisfying: 0.6≤L2 / L1≤0.95.

[0233] The dimension of the battery compartment 11 along the length X of the casing can be the length of the battery compartment 11, which can be measured using a ruler. As an example, the length direction of the outer shell 211 of the battery cell 21 is parallel to the length direction X of the casing. The sum of the dimensions of the outer shells 211 of multiple battery cells 21 arranged along the length direction X of the casing within the battery compartment 11 is the sum of the lengths of the outer shells 211 of the multiple battery cells 21. The dimension of the battery cell 21 along the length direction X of the casing can be measured using calipers. Among the multiple battery cells 21 arranged along the length direction X of the casing, adjacent battery cells 21 can be in direct contact, or intermediate components, such as thermal management components or heat insulation components, can be provided.

[0234] It should be noted that, in this embodiment, the outer shell 211 of all battery cells 21 arranged along the length X of the box body in the battery compartment 11 can be all equal in size, or at least two battery cells 21 can be of different sizes.

[0235] In this embodiment, L2 / L1 can be any point value of 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or any range value between two of them.

[0236] In this embodiment, L2 / L1 ≥ 0.6, ensuring that the outer casings 211 of the multiple battery cells 21 arranged along the length X of the housing have a large proportion of their dimensions within the battery compartment 11 along the length X of the housing. This fully utilizes the space of the battery compartment 11 along the length X of the housing, reducing the gap between the outer casings 211 of adjacent battery cells 21 along the length X of the housing. This is beneficial for increasing the volume proportion of the outer casings 211 of all battery cells 21 within the battery compartment 11, and for improving the volumetric energy density of the energy storage device 10. L2 / L1 ≤ 0.95 ensures that the battery compartment 11 has sufficient installation margin for installing multiple battery cells 21 along the length X of the housing, reducing the difficulty of installing the battery cells 21.

[0237] In some embodiments, 0.75 ≤ L2 / L1 ≤ 0.9.

[0238] In this embodiment, L2 / L1 can be any one of the following values ​​or a range between any two: 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9.

[0239] In this embodiment, 0.75≤L2 / L1≤0.9 balances the volumetric energy density of the energy storage device 10 and the ease of installation of the battery cell 21 in the length direction X of the box. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery cell 21 in the length direction X of the box.

[0240] In some embodiments, along the length direction X of the housing, the size of the outer shell 211 of each battery cell 21 is L3, and N2 battery cells 21 are arranged in the battery compartment 11, satisfying: L2=L3*N2.

[0241] Where N2 is a positive integer greater than or equal to 2.

[0242] In this embodiment, L2 = L3 * N2, ensuring that the dimensions of the outer casings 211 of the multiple battery cells 21 are equal along the length X of the casing. This effectively reduces the probability of wasted space due to differences in the dimensions of the outer casings 211 of the battery cells 21 along the length X of the casing. During assembly, multiple battery cells 21 of the same specification can be arranged along the length X of the casing, improving the assembly efficiency of the energy storage device 10 and reducing its manufacturing cost.

[0243] In some embodiments, 0.03 ≤ L3 / L1 ≤ 0.12.

[0244] L3 / L1 can be any point value of 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, etc., or a range of values ​​between any two.

[0245] In this embodiment, L3 / L1 ≥ 0.03, ensuring that the outer casing 211 of the battery cell 21 has a relatively large proportion of its dimensions along the length X of the battery compartment 11. Given a fixed length X of the battery compartment 11, this reduces the number of battery cells 21 that can be accommodated within the battery compartment 11, decreasing the probability of reduced usable space due to an excessive number of battery cells 21, and thus improving the volumetric energy density of the energy storage device 10. L3 / L1 ≤ 0.12 ensures that the outer casing 211 of the battery cell 21 does not have an excessively large proportion of its dimensions along the length X of the battery compartment 11, effectively reducing the manufacturing difficulty and cost of the battery cell 21.

[0246] In some embodiments, 0.055 ≤ L3 / L1 ≤ 0.09.

[0247] In this embodiment, L3 / L1 can be any point value of 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, or any range value between two of them.

[0248] In this embodiment, 0.055≤L3 / L1≤0.09 is beneficial to further improve the volumetric energy density of the energy storage device 10 and reduce the manufacturing cost of the battery cell 21.

[0249] In some embodiments, 0.17m ≤ L3 ≤ 0.6m.

[0250] In this embodiment, L3 can be any one of the following values: 0.17m, 0.2m, 0.25m, 0.3m, 0.35m, 0.4m, 0.45m, 0.5m, 0.55m, 0.6m, or a range between any two.

[0251] In this embodiment, L3 ≥ 0.17m ensures that the outer casing 211 of the battery cell 21 has a larger dimension along the length X of the casing, which is beneficial for increasing the proportion of the outer casing 211 of the battery cell 21 within the battery compartment 11 along the length X of the casing, and thus improving the volumetric energy density of the energy storage device 10. L3 ≤ 0.6m ensures that the outer casing 211 of the battery cell 21 is not too large along the length X of the casing, effectively reducing the manufacturing difficulty and cost of the battery cell 21.

[0252] In some embodiments, 0.2m ≤ L3 ≤ 0.45m.

[0253] In this embodiment, L3 can be any point value or a range value between any two of the following: 0.2m, 0.23m, 0.25m, 0.28m, 0.3m, 0.33m, 0.35m, 0.38m, 0.4m, 0.43m, 0.45m.

[0254] In this embodiment, it is beneficial to further improve the volumetric energy density of the energy storage device 10 and reduce the manufacturing cost of the battery cell 21.

[0255] In some embodiments, along the length direction X of the box body, the dimension of the box body 1 is L, which satisfies: 0.65≤L1 / L≤0.95.

[0256] The dimension of box 1 along the length direction is the length of box 1, which can be measured using a ruler.

[0257] In this embodiment, L1 / L can be any point value of 0.65, 0.7, 0.75, 0.8, 0.85, 0.95, or any range value between two of them.

[0258] A ratio of L1 / L ≥ 0.65 ensures that the battery compartment 11 occupies a large proportion of the length X of the housing 1, thus providing more space for the battery cells 21 and improving the volumetric energy density of the energy storage device 10. A ratio of L1 / L ≤ 0.95 ensures sufficient margin in the length direction of the housing 1 for the portion not occupied by the battery compartment 11, giving the housing 1 adequate structural strength.

[0259] In some embodiments, 0.75 ≤ L1 / L ≤ 0.9.

[0260] In this embodiment, L1 / L can be any point value or a range value between any two of the following: 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9.

[0261] In this embodiment, 0.75≤L1 / L≤0.9 can take into account both the volumetric energy density of the energy storage device 10 and the structural strength of the housing 1. This is beneficial for improving the volumetric energy density of the energy storage device 10 and further improving the structural strength of the housing 1.

[0262] In some embodiments, 3m ≤ L ≤ 9m.

[0263] In this embodiment, L can be any point value of 3m, 3.5m, 4m, 4.5m, 5m, 5.5m, 6m, 6.5m, 7m, 7.5m, 8m, 8.5m, 9m, or any range between two of them.

[0264] In this embodiment, L≥3m ensures that the length of the housing 1 is relatively large, allowing the battery compartment 11 to be larger along the length X direction of the housing. This increases the proportion of the battery compartment 11 in the length X direction of the housing 1, which in turn improves the volumetric energy density of the energy storage device 10. L≤9m ensures that the length of the housing 1 is not excessively large, facilitating the handling and transportation of the energy storage device 10.

[0265] In some embodiments, 5m ≤ L ≤ 7m.

[0266] L can be any point value from 5m, 5.1m, 5.2m, 5.3m, 5.4m, 5.5m, 5.6m, 5.7m, 5.8m, 5.9m, 6m, 6.1m, 6.2m, 6.3m, 6.4m, 6.5m, 6.6m, 6.7m, 6.8m, 6.9m, 7m, or a range between any two.

[0267] In this embodiment, 5m≤L≤7m can further balance the volumetric energy density of the energy storage device 10 and the convenience of handling and transportation of the energy storage device 10.

[0268] In some embodiments, please continue referring to 3, the battery compartment 11 contains a plurality of battery cells 21 arranged along the width direction Y of the housing. The dimension of the battery compartment 11 along the width direction Y of the housing is D1, and the sum of the dimensions of the outer shells 211 of the plurality of battery cells 21 arranged in the battery compartment 11 is D2, satisfying: 0.6≤D2 / D1≤0.95.

[0269] The dimension of the battery compartment 11 along the width direction Y of the casing can be the width of the battery compartment 11, which can be measured using a ruler. As an example, the width direction of the outer shell 211 of the battery cell 21 is parallel to the width direction Y of the casing. The sum of the dimensions of the outer shells 211 of multiple battery cells 21 arranged along the width direction Y of the casing within the battery compartment 11 is the sum of the widths of the outer shells 211 of the multiple battery cells 21. The dimension of the battery cell 21 along the width direction Y of the casing can be measured using calipers. Among the multiple battery cells 21 arranged along the width direction Y of the casing, adjacent battery cells 21 can be in direct contact, or intermediate components, such as thermal management components or heat insulation components, can be provided.

[0270] It should be noted that, in this embodiment, the outer shell 211 of all battery cells 21 arranged along the width Y direction of the box in the battery compartment 11 can be all equal in size, or at least two battery cells 21 can be of different sizes.

[0271] In this embodiment, D2 / D1 can be any point value of 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or any range value between two of them.

[0272] In this embodiment, D2 / D1 ≥ 0.6, ensuring that the outer casings 211 of the multiple battery cells 21 arranged along the width direction of the housing 1 have a large proportion of the dimensions of the battery compartment 11 along the width direction Y. This fully utilizes the space of the battery compartment 11 in the width direction Y, reduces the gap between the outer casings 211 of two adjacent battery cells 21 in the width direction Y, and helps to increase the volume proportion of the outer casings 211 of all battery cells 21 in the battery compartment 11, thereby improving the volumetric energy density of the energy storage device 10. D2 / D1 ≤ 0.95 ensures that the battery compartment 11 has sufficient installation margin in the width direction Y of the housing to install multiple battery cells 21, reducing the installation difficulty of the battery cells 21.

[0273] In some embodiments, 0.75 ≤ D2 / D1 ≤ 0.9.

[0274] In this embodiment, D2 / D1 can be any point value of 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, or any range between them.

[0275] In this embodiment, 0.75≤D2 / D1≤0.9 takes into account both the volumetric energy density of the energy storage device 10 and the ease of installation of the battery cell 21 in the width direction Y of the box. This is beneficial to improving the volumetric energy density of the energy storage device 10 and further reducing the difficulty of installing the battery cell 21 in the width direction Y of the box.

[0276] In some embodiments, along the width direction Y of the housing, the size of the outer shell 211 of each battery cell 21 is D3, and N3 battery cells 21 are arranged in the battery compartment 11, satisfying: D2=D3*N3.

[0277] Where N3 is a positive integer greater than or equal to 2.

[0278] In this embodiment, D2 = D3 * N3, ensuring that the outer casings 211 of the multiple battery cells 21 have equal dimensions along the width Y direction of the housing. This effectively reduces the probability of wasted space due to differences in the dimensions of the outer casings 211 of the battery cells 21 along the width Y direction of the housing. During assembly, multiple battery cells 21 of the same specification can be arranged along the width Y direction of the housing, improving the assembly efficiency of the energy storage device 10 and reducing its manufacturing cost.

[0279] In some embodiments, 0.02 ≤ D3 / D1 ≤ 0.05.

[0280] D3 / D1 can be any point value from 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, or any range between the two.

[0281] In this embodiment, D3 / D1 ≥ 0.02 ensures that the outer casing 211 of the battery cell 21 has a relatively large proportion of its dimensions along the width Y direction of the battery compartment 11. Given a fixed dimension of the battery compartment 11 along the width Y direction, this reduces the number of battery cells 21 that can be accommodated within the battery compartment 11, decreasing the probability of reduced usable space due to an excessive number of battery cells 21, and thus improving the volumetric energy density of the energy storage device 10. D3 / D1 ≤ 0.05 ensures that the outer casing 211 of the battery cell 21 does not have an excessively large proportion of its dimensions along the width Y direction of the battery compartment 11, effectively reducing the manufacturing difficulty and cost of the battery cell 21.

[0282] In some embodiments, 0.032 ≤ D3 / D1 ≤ 0.04.

[0283] D3 / D1 can be any point value from 0.032, 0.033, 0.034, 0.035, 0.036, 0.037, 0.038, 0.039, 0.04, or any range between the two.

[0284] In this embodiment, 0.032≤D3 / D1≤0.04 is beneficial to further improve the volumetric energy density of the energy storage device 10 and reduce the manufacturing cost of the battery cell 21.

[0285] In some embodiments, 0.04m ≤ D3 ≤ 0.12m.

[0286] D3 can be any point value of 0.04m, 0.05m, 0.06m, 0.07m, 0.08m, 0.09m, 0.1m, 0.11m, 0.12m, or any range between two of them.

[0287] In this embodiment, D3 ≥ 0.04m ensures that the outer casing 211 of the battery cell 21 has a larger dimension along the width Y direction of the housing, which is beneficial to increasing the proportion of the outer casing 211 of the battery cell 21 within the battery compartment 11 along the width Y direction of the housing, and thus improving the volumetric energy density of the energy storage device 10. D3 ≤ 0.12m ensures that the outer casing 211 of the battery cell 21 is not too large along the width Y direction of the housing, effectively reducing the manufacturing difficulty and cost of the battery cell 21.

[0288] In some embodiments, 0.06m ≤ D3 ≤ 0.08m.

[0289] In this embodiment, D3 can be any one of the following values: 0.06m, 0.061m, 0.062m, 0.063m, 0.064m, 0.065m, 0.066m, 0.067m, 0.068m, 0.069m, 0.07m, 0.071m, 0.07m, 0.073m, 0.074m, 0.075m, 0.076m, 0.077m, 0.078m, 0.079m, 0.08m, or a range between any two.

[0290] In this embodiment, 0.06m≤D3≤0.08m is beneficial to further improve the volumetric energy density of the energy storage device 10 and reduce the manufacturing cost of the battery cell 21.

[0291] In some embodiments, along the width direction Y of the box body, the dimension of the box body 1 is D, which satisfies: 0.65≤D1 / D≤0.99.

[0292] The dimension of box 1 along the width direction is the width of box 1, which can be measured using a ruler.

[0293] In this embodiment, D1 / D can be any point value of 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, or any range between two values.

[0294] In this embodiment, D1 / D ≥ 0.65 ensures that the battery compartment 11 has a larger proportion of the width Y of the housing 1, thus providing more space for the battery cells 21 and improving the volumetric energy density of the energy storage device 10. D1 / D ≤ 0.95 ensures sufficient margin in the width direction of the housing 1 for the portion not occupied by the battery compartment 11, giving the housing 1 sufficient structural strength.

[0295] In some embodiments, 0.75 ≤ D1 / D ≤ 0.92.

[0296] In this embodiment, D1 / D can be any point value or a range value between any two of the following: 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92.

[0297] In this embodiment, 0.75≤D1 / D≤0.92 can take into account both the volumetric energy density of the energy storage device 10 and the structural strength of the housing 1. This is beneficial for improving the volumetric energy density of the energy storage device 10 and further improving the structural strength of the housing 1.

[0298] In some embodiments, 1.5m ≤ D ≤ 3.5m.

[0299] D can be any point value of 1.5m, 1.8m, 2m, 2.3m, 2.5m, 2.8m, 3m, 3.2m, 3.5m, or a range between any two.

[0300] In this embodiment, D ≥ 1.5m, which makes the dimension of the housing 1 in the width direction relatively large. This allows the battery compartment 11 to be made larger in the width direction Y of the housing, which is beneficial to increasing the proportion of the battery compartment 11 in the width direction Y of the housing 1, and thus improving the volumetric energy density of the energy storage device 10. L ≤ D ≤ 3.5m ensures that the dimension of the housing 1 in the width direction is not too large, facilitating the handling and transportation of the energy storage device 10.

[0301] In some embodiments, 2m ≤ D ≤ 3m.

[0302] In this embodiment, D can be any point value of 2m, 2.1m, 2.2m, 2.3m, 2.4m, 2.5m, 2.6m, 2.7m, 2.8m, 2.9m, 3m, or any range value between two of them.

[0303] In this embodiment, 2m≤D≤3m can further balance the volumetric energy density of the energy storage device 10 and the convenience of handling and transportation of the energy storage device 10.

[0304] In some embodiments, please continue to refer to Figure 2 and Figure 3 The battery compartment 11 contains multiple battery cells 21 arranged along the height direction Z of the casing. The size of the battery compartment 11 along the height direction Z is H1, and the sum of the sizes of the outer shells 211 of the multiple battery cells 21 arranged in the battery compartment 11 is H2, satisfying: 0.6≤H2 / H1≤0.95.

[0305] The dimension of the battery compartment 11 along the height direction Z of the casing can be the height of the battery compartment 11, which can be measured using a ruler. As an example, the height direction of the outer shell 211 of the battery cell 21 is parallel to the height direction Z of the casing. The sum of the dimensions of the outer shells 211 of multiple battery cells 21 arranged along the height direction Z within the battery compartment 11 is the sum of the heights of the outer shells 211 of the multiple battery cells 21. The dimension of the battery cell 21 along the height direction Z of the casing can be measured using vernier calipers. Among the multiple battery cells 21 arranged along the height direction Z of the casing, adjacent battery cells 21 can be in direct contact, or intermediate components, such as thermal management components or heat insulation components, can be provided.

[0306] It should be noted that, in this embodiment, the outer shell 211 of all battery cells 21 arranged along the height direction Z of the battery compartment 11 can be all equal in size, or at least two battery cells 21 can be of different sizes.

[0307] In this embodiment, H2 / H1 can be any point value of 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, or any range value between two of them.

[0308] In this embodiment, H2 / H1≥0.6 ensures that the outer casings 211 of the multiple battery cells 21 arranged along the height direction of the housing 1 have a large proportion of the dimensions of the outer casings 211 in the height direction Z of the housing within the battery compartment 11. This fully utilizes the space of the battery compartment 11 in the height direction Z, reduces the gap between the outer casings 211 of two adjacent battery cells 21 in the height direction Z, and helps to increase the volume proportion of the outer casings 211 of all battery cells 21 in the battery compartment 11, thereby improving the volumetric energy density of the energy storage device 10. H2 / H1≤0.95 ensures that the battery compartment 11 has sufficient installation margin in the height direction Z of the housing for installing multiple battery cells 21, reducing the installation difficulty of the battery cells 21.

[0309] In some embodiments, 0.7 ≤ H2 / H1 ≤ 0.9.

[0310] In this embodiment, H2 / H1 can be any point value or a range value between any two of the following: 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.80, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9.

[0311] In this embodiment, 0.7≤H2 / H1≤0.9 balances the volumetric energy density of the energy storage device 10 and the ease of installation of the battery cell 21 in the height direction Z of the housing. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery cell 21 in the height direction Z of the housing.

[0312] In some embodiments, along the height direction Z of the housing, the size of the outer shell 211 of each battery cell 21 is H3, and N4 battery cells 21 are arranged in the battery compartment 11, satisfying: H2 = H3 * N4.

[0313] Where N4 is a positive integer greater than or equal to 2.

[0314] In this embodiment, D2 = D3 * N3, ensuring that the dimensions of the outer casings 211 of multiple battery cells 21 are equal along the height direction Z of the housing. This effectively reduces the probability of wasted space due to differences in the dimensions of the outer casings 211 of the battery cells 21 along the height direction Z of the housing. During assembly, multiple battery cells 21 of the same specification can be arranged along the height direction Z of the housing, improving the assembly efficiency of the energy storage device 10 and reducing its manufacturing cost.

[0315] In some embodiments, 0.07 ≤ H3 / H1 ≤ 0.12.

[0316] H3 / H1 can be any point value of 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, 0.1, 0.11, 0.12, etc., or a range of values ​​between any two.

[0317] In this embodiment, H3 / H1 ≥ 0.07, which ensures that the outer casing 211 of the battery cell 21 has a relatively large proportion of its dimensions along the height direction Z within the battery compartment 11. Given a fixed dimension of the battery compartment 11 along the height direction Z, this reduces the number of battery cells 21 that can be accommodated within the battery compartment 11, decreasing the probability of reduced usable space due to an excessive number of battery cells 21, and thus improving the volumetric energy density of the energy storage device 10. H3 / H1 ≤ 0.12 ensures that the outer casing 211 of the battery cell 21 does not have an excessively large proportion of its dimensions along the height direction Z within the battery compartment 11, effectively reducing the manufacturing difficulty and cost of the battery cell 21.

[0318] In some embodiments, 0.08 ≤ H3 / H1 ≤ 0.1.

[0319] In this embodiment, H3 / H1 can be any point value or a range value between any two of the following: 0.08, 0.081, 0.082, 0.083, 0.084, 0.085, 0.086, 0.087, 0.088, 0.088, 0.089, 0.09, 0.091, 0.092, 0.093, 0.094, 0.095, 0.096, 0.097, 0.098, 0.099, 0.1.

[0320] In this embodiment, 0.08≤H3 / H1≤0.1 is beneficial to further improve the volumetric energy density of the energy storage device 10 and reduce the manufacturing cost of the battery cell 21.

[0321] In some embodiments, 0.17m ≤ H3 ≤ 0.6m.

[0322] H3 can be any point value or a range between any two of the following: 0.17m, 0.2m, 0.25m, 0.3m, 0.35m, 0.4m, 0.45m, 0.5m, 0.55m, 0.6m.

[0323] In this embodiment, H3 ≥ 0.17m, which makes the size of the outer casing 211 of the battery cell 21 larger along the height direction Z of the casing. This is beneficial to increasing the proportion of the outer casing 211 of the battery cell 21 within the battery compartment 11 along the height direction Z, and thus improving the volumetric energy density of the energy storage device 10. H3 ≤ 0.6m ensures that the size of the outer casing 211 of the battery cell 21 along the height direction Z of the casing is not too large, effectively reducing the manufacturing difficulty and cost of the battery cell 21.

[0324] In some embodiments, 0.2m ≤ H3 ≤ 0.45m.

[0325] In this embodiment, H3 can be any point value or a range value between any two of the following: 0.2m, 0.23m, 0.25m, 0.28m, 0.3m, 0.33m, 0.35m, 0.38m, 0.4m, 0.43m, 0.45m.

[0326] In this embodiment, 0.2m≤H3≤0.45m is beneficial to further improve the volumetric energy density of the energy storage device 10 and reduce the manufacturing cost of the battery cell 21.

[0327] In some embodiments, along the height direction Z of the box body, the dimension of the box body 1 is H, which satisfies: 0.55≤H1 / H≤0.85.

[0328] The dimension of box 1 along the height direction is the height of box 1, which can be measured using a ruler.

[0329] In this embodiment, H1 / H can be any point value of 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, or any range value between two of them.

[0330] In this embodiment, H1 / H ≥ 0.55 ensures that the battery compartment 11 has a large proportion of the height Z of the housing 1, thus providing more space for the battery cells 21 and improving the volumetric energy density of the energy storage device 10. H1 / H ≤ 0.85 ensures that the portion of the housing 1 not occupied by the battery compartment 11 in the height direction has sufficient margin, giving the housing 1 sufficient structural strength.

[0331] In some embodiments, 0.65 ≤ H1 / H ≤ 0.78.

[0332] In this embodiment, H1 / H can be any point value or a range value between any two of the following: 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78.

[0333] In this embodiment, 0.65≤H1 / H≤0.78 can take into account both the volumetric energy density of the energy storage device 10 and the structural strength of the housing 1. This is beneficial for improving the volumetric energy density of the energy storage device 10 and further improving the structural strength of the housing 1.

[0334] In some embodiments, 1.5m ≤ H ≤ 3.5m.

[0335] H can be a point value of any one of 1.5m, 1.8m, 2m, 2.3m, 2.5m, 2.8m, 3m, 3.2m, 3.5m, or a range between any two.

[0336] In this embodiment, H ≥ 1.5m, which makes the dimensions of the housing 1 along the height direction larger, allowing the battery compartment 11 to be larger along the height direction Z of the housing. This is beneficial for increasing the proportion of the battery compartment 11 in the housing 1 along the height direction Z, and for improving the volumetric energy density of the energy storage device 10. H ≤ 3.5m ensures that the dimensions of the housing 1 along the height direction are not too large, facilitating the handling and transportation of the energy storage device 10.

[0337] In some embodiments, 2m ≤ H ≤ 3m.

[0338] In this embodiment, H can be any point value of 2m, 2.1m, 2.2m, 2.3m, 2.4m, 2.5m, 2.6m, 2.7m, 2.8m, 2.9m, 3m, or any range value between two of them.

[0339] In this embodiment, 2m≤H≤3m can further balance the volumetric energy density of the energy storage device 10 and the convenience of handling and transportation of the energy storage device 10.

[0340] In some embodiments, please refer to Figures 7-9 , Figure 7 This is a schematic diagram of the structure of the energy storage device 10 provided in some embodiments of this application; Figure 8 for Figure 7 The energy storage device 10 shown is a BB cross-sectional view; Figure 9 An exploded view of a battery 2 is provided for some embodiments of this application. The battery compartment 11 contains at least one battery 2, and the battery 2 includes a plurality of battery cells 21.

[0341] The battery compartment 11 can contain one or more batteries 2. As an example, both the housing 1 and the battery 2 are rectangular parallelepipeds. After being housed in the battery compartment 11, the battery 2 can be positioned such that one of its length, width, or height directions is parallel to the length direction (X) of the housing, another is parallel to the width direction (Y) of the housing, and yet another is parallel to the height direction (Z) of the housing. Figures 7-9 In the figure, the length direction of battery 2 is parallel to the width direction Y of the box, the width direction of battery 2 is parallel to the length direction X of the box, and the height direction of battery 2 is parallel to the height direction Z of the box.

[0342] Along the length direction X of the box, the battery compartment 11 can hold one battery 2 or multiple batteries 2; along the width direction Y of the box, the battery compartment 11 can hold one battery 2 or multiple batteries 2; along the height direction Z of the box, the battery compartment 11 can hold one battery 2 or multiple batteries 2.

[0343] In some embodiments, the battery 2 can be a battery module, which can be formed by arranging and fixing multiple battery cells 21. In the battery module, a frame can be formed by two side plates and two end plates, and multiple battery cells 21 are fixed in the frame to form the battery module.

[0344] In other embodiments, such as Figure 9 As shown, battery 2 can be a battery pack, and battery 2 also includes a battery case 22, in which multiple battery cells 21 are housed. Battery case 22 can include a first part 221 and a second part 222, which overlap each other to define a space for accommodating the battery cells 21. The first part 221 and the second part 222 can have various shapes, such as cuboid or cylindrical. The first part 221 can be a hollow structure open on one side, and the second part 222 can also be a hollow structure open on one side, with the open side of the second part 222 overlapping the open side of the first part 221, thus forming a battery case 22 with accommodating space. Alternatively, the first part 221 can be a hollow structure open on one side, and the second part 222 can be a plate-like structure, with the second part 222 overlapping the open side of the first part 221, thus forming a battery case 22 with accommodating space. The first part 221 and the second part 222 can be sealed using a sealing element, such as a sealing ring or sealant.

[0345] During assembly, multiple battery cells 21 can be assembled into battery 2 first, and then battery 2 can be installed in battery compartment 11. Battery 2, which is composed of multiple battery cells 21, has a larger volume and is easier to install in battery compartment 11, resulting in high assembly efficiency.

[0346] In some embodiments, please continue to refer to Figure 7 The battery compartment 11 contains multiple batteries 2 arranged along the length X of the casing. The dimension of the battery compartment 11 along the length X of the casing is L1, and the sum of the dimensions of the multiple batteries 2 arranged in the battery compartment 11 is L4, satisfying: 0.7≤L4 / L1≤0.96.

[0347] As an example, the width of battery 2 is parallel to the length direction X of the casing. The sum of the dimensions of the multiple batteries 2 arranged along the length direction X of the casing within the battery compartment 11 is the sum of the widths of the multiple batteries 2. The dimension of battery 2 in the length direction X of the casing can be measured using a ruler.

[0348] It should be noted that, in this embodiment, the multiple batteries 2 arranged along the length X of the box body in the battery compartment 11 can all be of equal size, or at least two batteries 2 can be of different sizes.

[0349] L4 / L1 can be any point value of 0.7, 0.75, 0.8, 0.85, 0.9, 0.96, or any range between the two.

[0350] In this embodiment, 0.7 ≤ L4 / L1 ≤ 0.96, the battery compartment 11 accommodates multiple batteries 2 arranged along the length X of the casing, ensuring that the size of a single battery 2 along the length X of the casing is not too large, reducing the manufacturing and installation difficulty of the battery 2. L4 / L1 ≥ 0.7 ensures that the multiple batteries 2 arranged along the length X of the casing occupy a large proportion of the dimensions along the length X of the casing within the battery compartment 11, fully utilizing the space of the battery compartment 11 along the length X of the casing, reducing the gap between adjacent batteries 2 along the length X of the casing, which is beneficial to increasing the volume proportion of all batteries 2 in the battery compartment 11 and improving the volumetric energy density of the energy storage device 10. L4 / L1 ≤ 0.96 ensures that the battery compartment 11 has sufficient installation margin along the length X of the casing to accommodate multiple batteries 2, reducing the installation difficulty of the battery 2.

[0351] In some embodiments, 0.78 ≤ L4 / L1 ≤ 0.91.

[0352] In this embodiment, L4 / L1 can be any point value of 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, or any range value between two of them.

[0353] In this embodiment, 0.78≤L4 / L1≤0.91 balances the volumetric energy density of the energy storage device 10 and the ease of installation of the battery 2 in the length direction X of the casing. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery 2 in the length direction X of the casing.

[0354] In some embodiments, please continue to refer to Figure 7 Along the length direction X of the box, the size of each battery 2 is L5, and N5 batteries 2 are arranged in the battery compartment 11, satisfying: L4=L5*N5.

[0355] Where N5 is a positive integer greater than or equal to 2.

[0356] In this embodiment, L4 = L5 * N5, ensuring that the dimensions of the multiple batteries 2 are equal along the length X of the casing. This effectively reduces the probability of wasted space due to differences in the dimensions of the batteries 2 along the length X of the casing. During assembly, multiple batteries 2 of the same specification can be arranged along the length X of the casing, improving the assembly efficiency of the energy storage device 10 and reducing its manufacturing cost.

[0357] In some embodiments, 1m≤L5≤1.5m, 2≤N5≤6.

[0358] L5 can be any point value or a range between any two of the following: 1m, 1.05m, 1.1m, 1.15m, 1.2m, 1.25m, 1.3m, 1.35m, 1.4m, 1.45m, 1.5m. N5 can be 2, 3, 4, 5, or 6.

[0359] In this embodiment, 1m≤L5≤1.5m, 2≤N5≤6, along the length direction X of the box, the size of each battery 2 is relatively large, and the number of batteries 2 is not too large. This can reduce the space occupied by other components in the battery 2 besides the battery cell 21 (e.g., the box wall of the battery box 22), which is beneficial to increase the size ratio of multiple batteries 2 arranged along the length direction X of the box in the battery compartment 11 along the length direction X of the box.

[0360] In some embodiments, please refer to Figure 10 , Figure 10 This is a schematic diagram of the structure of an energy storage device 10 provided in some embodiments of this application. Along the length direction X of the housing, the battery compartment 11 accommodates only one battery 2. The size of the battery compartment 11 is L1, and the size of the battery 2 is L5, satisfying: 0.8≤L5 / L1≤0.99.

[0361] As an example, the length direction of battery 2 is parallel to the length direction X of the casing, the width direction of battery 2 is parallel to the width direction Y of the casing, and the height direction of battery 2 is parallel to the height direction Z of the casing. The dimension of battery 2 along the length direction X of the casing is the length of battery 2.

[0362] L5 / L1 can be any point value of 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, 0.97, 0.99, or any range between two values.

[0363] In this embodiment, the battery compartment 11 accommodates only one battery 2 along the length X of the housing, which is beneficial to improving the utilization rate of the space in the battery compartment 11 along the length X of the housing. L5 / L1≥0.8 ensures that the battery 2 has a large size proportion within the battery compartment 11 along the length X of the housing, fully utilizing the space of the battery compartment 11 in the length X of the housing, which is beneficial to increasing the volume proportion of all batteries 2 within the battery compartment 11 and thus improving the volumetric energy density of the energy storage device 10. L5 / L1≤0.99 ensures that the battery compartment 11 has sufficient installation margin for the battery 2 in the length X of the housing, reducing the difficulty of installing the battery 2.

[0364] In some embodiments, 0.85 ≤ L5 / L1 ≤ 0.93.

[0365] In this embodiment, L5 / L1 can be any point value of 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, or any range value between two of them.

[0366] In this embodiment, 0.85≤L5 / L1≤0.93 takes into account both the volumetric energy density of the energy storage device 10 and the ease of installation of the battery 2 in the length direction X of the casing. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery 2 in the length direction X of the casing.

[0367] In some embodiments, 4m≤L5≤8m.

[0368] L5 can be any one of the following values: 4m, 4.5m, 5m, 5.5m, 6m, 6.5m, 7m, 7.5m, 8m, or any range between two values.

[0369] In this embodiment, L5≥4m, which makes the size of the battery 2 along the length X of the box larger, and more battery cells 21 can be arranged in the battery 2 along the length X of the box, which can meet the high energy requirements of the energy storage device 10; L5≤8m, which makes the size of the battery 2 along the length X of the box not too large, reducing the manufacturing and installation difficulty of the battery 2.

[0370] In some embodiments, 5.5m ≤ L5 ≤ 6.8m.

[0371] In this embodiment, L5 can be any one of the following values: 5.5m, 5.6m, 5.7m, 5.8m, 5.9m, 6m, 6.1m, 6.2m, 6.3m, 6.4m, 6.5m, 6.6m, 6.7m, 6.8m, or a range between any two.

[0372] In this embodiment, 5.5m≤L5≤6.8m takes into account both the large energy of the energy storage device 10 and the economic efficiency and ease of installation of the battery 2.

[0373] In some embodiments, please refer to Figure 11 , Figure 11 for Figure 10 The diagram shows a CC cross-sectional view of the energy storage device 10. The battery compartment 11 contains a plurality of batteries 2 arranged along the width direction Y of the casing. The dimension of the battery compartment 11 along the width direction Y of the casing is D1, and the sum of the dimensions of the plurality of batteries 2 arranged in the battery compartment 11 is D4, satisfying: 0.7≤D4 / D1≤0.96.

[0374] As an example, the width direction of battery 2 is parallel to the width direction Y of the casing. The sum of the dimensions of the multiple batteries 2 arranged along the width direction Y of the casing within the battery compartment 11 is the sum of the widths of the multiple batteries 2. The dimension of battery 2 in the width direction Y of the casing can be measured using a ruler.

[0375] It should be noted that, in this embodiment, the multiple batteries 2 arranged along the width direction Y of the battery compartment 11 can all be of equal size, or at least two batteries 2 can be of unequal size.

[0376] In this embodiment, along the length direction X of the housing, the battery compartment 11 can accommodate one battery 2 or multiple batteries 2.

[0377] D4 / D1 can be any point value of 0.7, 0.75, 0.8, 0.85, 0.9, 0.96, or any range between the two.

[0378] In this embodiment, the battery compartment 11 houses multiple batteries 2 arranged along the width direction Y of the housing, ensuring that the size of a single battery 2 along the width direction Y is not excessive, thus reducing the manufacturing and installation difficulty of the battery 2. D4 / D1≥0.7 ensures that the multiple batteries 2 arranged along the width direction Y of the housing occupy a large proportion of the size of the battery compartment 11 along the width direction Y, fully utilizing the space of the battery compartment 11 in the width direction Y, reducing the gap between adjacent batteries 2 in the width direction Y, which is beneficial to increasing the volume proportion of all batteries 2 in the battery compartment 11 and improving the volumetric energy density of the energy storage device 10. D4 / D1≤0.96 ensures that the battery compartment 11 has sufficient installation margin in the width direction Y of the housing for installing multiple batteries 2, reducing the installation difficulty of the battery 2.

[0379] In some embodiments, 0.78 ≤ D4 / D1 ≤ 0.91.

[0380] In this embodiment, D4 / D1 can be any point value of 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, or any range value between two of them.

[0381] In this embodiment, 0.78≤D4 / D1≤0.91 takes into account both the volumetric energy density of the energy storage device 10 and the ease of installation of the battery 2 in the width direction Y of the housing. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery 2 in the width direction Y of the housing.

[0382] In some embodiments, along the width direction Y of the housing, the size of each battery 2 is D5, and N6 batteries 2 are arranged in the battery compartment 11, satisfying: D4 = D5 * N6.

[0383] Where N6 is a positive integer greater than or equal to 2.

[0384] In this embodiment, D4 = D5 * N6, ensuring that the dimensions of the multiple batteries 2 are equal along the width direction Y of the housing. This effectively reduces the probability of wasted space due to differences in the dimensions of the batteries 2 along the width direction Y of the housing. During assembly, multiple batteries 2 of the same specification can be arranged along the width direction Y of the housing, improving the assembly efficiency of the energy storage device 10 and reducing its manufacturing cost.

[0385] In some embodiments, 1m≤D5≤1.5m, 2≤N6≤3.

[0386] D5 can be any point value from 1m, 1.05m, 1.1m, 1.15m, 1.2m, 1.25m, 1.3m, 1.35m, 1.4m, 1.45m, 1.5m, or any range between two values. N6 can be 2 or 3.

[0387] In this embodiment, 1m≤D5≤1.5m, 2≤N6≤3, along the width direction Y of the box, the size of each battery 2 is relatively large, and the number of batteries 2 is not too large. This can reduce the space occupied by other components in the battery 2 besides the battery cell 21 (e.g., the box wall of the battery box 22), which is beneficial to increase the size ratio of multiple batteries 2 arranged along the width direction Y of the box in the battery compartment 11 along the width direction Y of the box.

[0388] In some embodiments, please continue to refer to Figure 8 Along the width direction Y of the box, the battery compartment 11 can only hold one battery 2. The size of the battery compartment 11 is D1, and the size of the battery 2 is D5, satisfying: 0.8≤D5 / D1≤0.99.

[0389] In this embodiment, along the length X of the housing, the battery compartment 11 can accommodate one battery 2 or multiple batteries 2. As an example, in... Figure 8 The battery compartment 11 contains multiple batteries 2 along the length X of the casing. The length of the batteries 2 is parallel to the width Y of the casing, the width of the batteries 2 is parallel to the length X of the casing, and the height of the batteries 2 is parallel to the height Z of the casing. The dimension of the batteries 2 along the width Y of the casing is the length of the batteries 2.

[0390] D5 / D1 can be any point value from 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, 0.97, 0.99, or any range between two values.

[0391] In this embodiment, the battery compartment 11 accommodates only one battery 2 along the width direction Y of the housing, which is beneficial to improving the utilization rate of the space in the battery compartment 11 along the width direction Y of the housing. D5 / D1≥0.8 ensures that the size of the battery 2 in the battery compartment 11 along the width direction Y of the housing is relatively large, making full use of the space in the battery compartment 11 in the width direction Y of the housing, which is beneficial to increasing the volume ratio of all batteries 2 in the battery compartment 11 and improving the volumetric energy density of the energy storage device 10. D5 / D1≤0.99 ensures that the battery compartment 11 has sufficient installation margin for installing the battery 2 in the width direction Y of the housing, reducing the installation difficulty of the battery 2.

[0392] In some embodiments, 0.85 ≤ D5 / D1 ≤ 0.93.

[0393] In this embodiment, D5 / D1 can be any point value of 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, or any range value between two of them.

[0394] In this embodiment, 0.85≤D5 / D1≤0.93 takes into account both the volumetric energy density of the energy storage device 10 and the ease of installation of the battery 2 in the width direction Y of the housing. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery 2 in the width direction Y of the housing.

[0395] In some embodiments, 1.5m ≤ D5 ≤ 2.5m.

[0396] D5 can be a point value of any one of 1.5m, 1.7m, 1.9m, 2.1m, 2.3m, 2.5m, or a range between any two.

[0397] In this embodiment, D5≥1.5m makes the size of battery 2 along the width direction Y of the box larger, and more battery cells 21 can be arranged in battery 2 along the width direction Y of the box, which can meet the high energy requirements of energy storage device 10; D5≤2.5m makes the size of battery 2 along the width direction Y of the box not too large, reducing the manufacturing and installation difficulty of battery 2.

[0398] In some embodiments, 1.7m ≤ D5 ≤ 2.3m.

[0399] In this embodiment, D5 can be any one of 1.7m, 1.8m, 1.9m, 2.1m, 2.2m, 2.3m, or a range between any two.

[0400] In this embodiment, 1.7m≤D5≤2.3m takes into account both the large energy of the energy storage device 10 and the economic efficiency and ease of installation of the battery 2.

[0401] In some embodiments, please continue to refer to Figure 7 , Figure 8 , Figure 10 and Figure 11 As shown, the battery compartment 11 contains multiple batteries 2 arranged along the height direction Z of the casing. The dimension of the battery compartment 11 along the height direction Z is H1, and the sum of the dimensions of the multiple batteries 2 arranged in the battery compartment 11 is H4, satisfying: 0.6≤H4 / H1≤0.99.

[0402] As an example, the height direction of battery 2 is parallel to the height direction Z of the casing. The sum of the dimensions of the multiple batteries 2 arranged along the height of the casing 1 within the battery compartment 11 is the sum of the heights of the multiple batteries 2. The dimension of battery 2 in the height direction Z of the casing can be measured using a ruler.

[0403] It should be noted that, in this embodiment, the multiple batteries 2 arranged along the height direction Z of the battery compartment 11 can all be of equal size, or at least two batteries 2 can be of unequal size.

[0404] In this embodiment, along the length direction X of the housing, the battery compartment 11 can accommodate one battery 2 or multiple batteries 2. Along the width direction Y of the housing, the battery compartment 11 can accommodate one battery 2 or multiple batteries 2. Figure 7 and Figure 8 In the illustrated embodiment, the battery compartment 11 accommodates multiple batteries 2 along the length direction X of the housing, and the battery compartment 11 accommodates one battery 2 along the width direction Y of the housing; Figure 10 and Figure 11 In the illustrated embodiment, the battery compartment 11 accommodates one battery 2 along the length direction X of the housing, and the battery compartment 11 accommodates multiple batteries 2 along the width direction Y of the housing.

[0405] H4 / H1 can be any point value of 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, or any range between two values.

[0406] The battery compartment 11 houses multiple batteries 2 arranged along the height direction Z of the casing, ensuring that the size of a single battery 2 along the height direction Z is not excessive, thus reducing the manufacturing and installation difficulty of the battery 2. H4 / H1≥0.6 ensures that the multiple batteries 2 arranged along the height direction Z of the casing occupy a large proportion of the dimensions along the height direction Z within the battery compartment 11, fully utilizing the space of the battery compartment 11 in the height direction Z, reducing the gap between adjacent batteries 2 in the height direction Z, which is beneficial for increasing the volume proportion of all batteries 2 in the battery compartment 11 and improving the volumetric energy density of the energy storage device 10. H4 / H1≤0.99 ensures that the battery compartment 11 has sufficient installation margin in the height direction Z of the casing for installing multiple batteries 2, reducing the installation difficulty of the battery 2.

[0407] In some embodiments, 0.7 ≤ H4 / H1 ≤ 0.92.

[0408] H4 / H1 can be any point value from 0.7, 0.71, 0.72, 0.73, 0.74, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, or a range between any two.

[0409] In this embodiment, 0.7≤H4 / H1≤0.92 takes into account both the volumetric energy density of the energy storage device 10 and the ease of installation of the battery 2 in the height direction Z of the casing. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery 2 in the height direction Z of the casing.

[0410] In some embodiments, along the height direction Z of the housing, the size of each battery 2 is H5, and N7 batteries 2 are arranged in the battery compartment 11, satisfying: H4 = H5 * N7.

[0411] Where N7 is a positive integer greater than or equal to 2.

[0412] In this embodiment, H4 = H5 * N7, ensuring that the dimensions of the multiple batteries 2 are equal along the height direction Z of the casing. This effectively reduces the probability of wasted space due to differences in the dimensions of the batteries 2 along the height direction Z of the casing. During assembly, multiple batteries 2 of the same specification can be arranged along the height direction Z of the casing, improving the assembly efficiency of the energy storage device 10 and reducing its manufacturing cost.

[0413] In some embodiments, 0.2m≤H5≤0.3m, 2≤N7≤10.

[0414] H5 can be any point value from 0.21m, 0.22m, 0.23m, 0.24m, 0.25m, 0.26m, 0.27m, 0.28m, 0.29m, 0.3m, or any range between two values. N7 can be 2, 3, 3, 4, 5, 6, 7, 8, 9, or 10.

[0415] In this embodiment, 0.2m≤H5≤0.3m, 2≤N7≤10, along the height direction Z of the box, the size of each battery 2 is relatively large, and the number of batteries 2 is not too large. This can reduce the space occupied by other components in the battery 2 besides the battery cell 21 (e.g., the box wall of the battery box 22), which is beneficial to increase the size ratio of multiple batteries 2 arranged along the height direction Z of the box in the battery compartment 11 along the height direction Z of the box.

[0416] In some embodiments, please refer to Figure 12 , Figure 12 This is a cross-sectional view of an energy storage device 10 provided in some embodiments of this application. Along the height direction Z of the housing, the battery compartment 11 accommodates only one battery 2. The size of the battery compartment 11 is H1, and the size of the battery 2 is H5, satisfying: 0.8≤H5 / H1≤0.99.

[0417] In this embodiment, along the length direction X of the housing, the battery compartment 11 can accommodate one battery 2 or multiple batteries 2. Along the width direction Y of the housing, the battery compartment 11 can accommodate one battery 2 or multiple batteries 2. As an example, in... Figure 12 In the middle, the battery compartment 11 accommodates multiple batteries 2 along the width direction Y of the box body, and the battery compartment 11 accommodates multiple batteries 2 along the length direction X of the box body.

[0418] H5 / H1 can be any point value from 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, 0.97, 0.99, or any range between two values.

[0419] In this embodiment, the battery compartment 11 accommodates only one battery 2 along the height direction Z of the housing, which is beneficial to improving the utilization rate of the space in the battery compartment 11 along the height direction Z of the housing. H5 / H1≥0.8 ensures that the size of the battery 2 in the battery compartment 11 along the height direction Z of the housing is relatively large, making full use of the space in the battery compartment 11 in the height direction Z of the housing, which is beneficial to increasing the volume ratio of all batteries 2 in the battery compartment 11 and improving the volumetric energy density of the energy storage device 10. H5 / H1≤0.99 ensures that the battery compartment 11 has sufficient installation margin for installing the battery 2 in the height direction Z of the housing, reducing the installation difficulty of the battery 2.

[0420] In some embodiments, 0.85 ≤ H5 / H1 ≤ 0.93.

[0421] In this embodiment, H5 / H1 can be any point value of 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, or any range value between two of them.

[0422] In this embodiment, 0.85≤H5 / H1≤0.93 takes into account both the volumetric energy density of the energy storage device 10 and the ease of installation of the battery 2 in the height direction Z of the casing. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery 2 in the height direction Z of the casing.

[0423] In some embodiments, 1.5m ≤ H5 ≤ 2.5m.

[0424] H5 can be a point value of any one of 1.5m, 1.7m, 1.9m, 2.1m, 2.3m, 2.5m, or a range between any two.

[0425] H5≥1.5m ensures that the size of battery 2 along the height direction Z of the casing is large, and the size of the individual battery cell 21 in battery 2 along the height direction Z of the casing is also large, which can meet the high energy requirements of energy storage device 10; H5≤2.5m ensures that the size of battery 2 along the height direction Z of the casing is not too large, reducing the manufacturing and installation difficulty of battery 2.

[0426] In some embodiments, 1.7m ≤ H5 ≤ 2.3m.

[0427] In this embodiment, H5 can be any one of the following values: 1.7m, 1.8m, 1.9m, 2.1m, 2.2m, 2.3m, etc., or a range between any two values.

[0428] In this embodiment, 1.7m≤H5≤2.3m takes into account both the large energy of the energy storage device 10 and the economic efficiency and ease of installation of the battery 2.

[0429] In some embodiments, please refer to Figure 13 and Figure 14 , Figure 13 Structural views of the energy storage device 10 provided in some embodiments of this application; Figure 14 for Figure 13 The diagram shows the structure of the housing 1. The battery compartment 11 includes multiple sub-compartments 111, which are arranged along the length X of the housing. Each sub-compartment 111 contains at least one battery 2.

[0430] Sub-compartments 111 can be two, three, four, five, six, seven, eight, or more. Adjacent sub-compartments 111 can be separated by a partition 112. The partition 112 can be a partition plate between the two sub-compartments 111, or a partition beam between them. The partition beam can extend along the height direction Z of the container. When the partition 112 is a partition beam between two adjacent sub-compartments 111, multiple partition beams can be provided, and these multiple partition beams can be arranged at intervals along the width direction Y of the container.

[0431] Sub-cell 111 can have various shapes, such as cylindrical or prismatic. Prisms can be triangular, square, pentagonal, hexagonal, etc. As an example, in... Figure 13 In the middle, the sub-compartment 111 is a quadrangular prism, specifically, the sub-compartment 111 is a cuboid. The sub-compartment 111 can hold one battery 2 or multiple batteries 2.

[0432] In this embodiment, the battery compartment 11 is divided into multiple sub-compartments 111, each of which can accommodate the battery 2, so that the battery 2 can be more regularly accommodated in the battery compartment 11, making it easier to install the battery 2.

[0433] In some embodiments, the volume of sub-compartment 111 is V4, and the sum of the volumes of the batteries 2 in sub-compartment 111 is V5, satisfying: 0.75≤V5 / V4≤0.95.

[0434] The volume of sub-compartment 111 can be measured in several ways. For a regularly shaped sub-compartment 111, taking a cuboid shape as an example, the length, width, and height of sub-compartment 111 can be measured using a measuring tool. The volume V4 of sub-compartment 111 can then be calculated using these measurements. Essentially, V4 is the product of the length, width, and height of sub-compartment 111. A measuring ruler can be used as the measuring tool. For irregularly shaped sub-compartments 111, it is difficult to calculate the volume by measuring their external dimensions. In such cases, a filling method can be used to measure the volume. The specific method is as follows: Fill sub-compartment 111 with plastic granules. The plastic granules can be made of PP (polypropylene) or PE (polyethylene), with a particle size of 0.5mm-1.5mm and a density of 0.94g / cm³. 3 -0.96g / cm 3 The total volume of the plastic granules in sub-compartment 111 is measured using a measuring container to determine the volume of sub-compartment 111. Alternatively, the total weight of the plastic granules in sub-compartment 111 can be measured using a weighing device, and the total mass of the plastic granules in sub-compartment 111 can be calculated. Then, based on the formula: total volume of plastic granules = total mass of plastic granules / density of plastic granules, the total volume of plastic granules can be calculated, thus determining the volume V4 of sub-compartment 111.

[0435] In this embodiment, the battery 2 in the sub-compartment 111 can be one or more. If there is only one battery 2 in the sub-compartment 111, the sum of the volumes of the batteries 2 in the sub-compartment 111 is the volume of that battery 2. If there are multiple batteries 2 in the sub-compartment 111, the sum of the volumes of the batteries 2 in the sub-compartment 111 is the sum of the volumes of all the batteries 2 in the sub-compartment 111. The multiple batteries 2 in the sub-compartment 111 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that some of the multiple batteries 2 are connected in series and some in parallel. Along the length direction X of the box, the sub-compartment 111 can accommodate one battery 2 or multiple batteries 2; along the width direction Y of the box, the sub-compartment 111 can accommodate one battery 2 or multiple batteries 2; along the height direction Z of the box, the sub-compartment 111 can accommodate one battery 2 or multiple batteries 2.

[0436] If there are multiple batteries 2 in sub-compartment 111, the volumes of all batteries 2 in sub-compartment 111 can be equal, or at least two batteries 2 can have unequal volumes. V5 is the sum of the volumes of all batteries 2 in sub-compartment 111. If the volumes of all batteries 2 in sub-compartment 111 are equal, the volume of one battery 2 can be measured, and then multiplied by the number of batteries 2 in sub-compartment 111 to obtain V5. If the volumes of all batteries 2 in sub-compartment 111 are at least two unequal, for example, if all batteries 2 in sub-compartment 111 are composed of two different types of batteries 2, the volume of the first type of battery 2 can be measured first, and then multiplied by the number of first type of batteries 2 in sub-compartment 111 to obtain the third total volume. Then the volume of the second type of battery 2 can be measured, and then multiplied by the number of second type of batteries 2 in sub-compartment 111 to obtain the fourth total volume. The sum of the third and fourth total volumes is V5.

[0437] The volume of battery 2 can be measured in various ways. For a regularly shaped battery 2, taking a cuboid shape as an example, the length, width, and height of battery 2 can be measured using a measuring tool. The volume of battery 2 can then be calculated from these measurements. Essentially, the product of the length, width, and height is the volume of battery 2. A ruler can be used as the measuring tool. It should be noted that if all the outer surfaces of battery 2 are flat, the length, width, and height are measured using each outer surface as a reference. If a certain outer surface of battery 2 has a protrusion or concave area, the length, width, and height are measured using the flat area of ​​that outer surface as a reference. For irregularly shaped batteries 2, it is difficult to calculate the volume by measuring their external dimensions. In such cases, the immersion method can be used to measure the volume of battery 2. The specific method is as follows: Pour liquid into the measuring container and record the volume value X3 corresponding to the liquid level. Gradually immerse battery 2 into the liquid until battery 2 is completely immersed in the liquid. Record the volume value X4 corresponding to the liquid level at this time. X4-X3 is the volume of battery 2.

[0438] V5 / V4 can be any point value of 0.75, 0.78, 0.8, 0.82, 0.85, 0.87, 0.9, 0.92, 0.95, or any range between the two.

[0439] In this embodiment, V5 / V4 ≥ 0.75 ensures that the volume ratio of all batteries 2 within sub-compartment 111 is relatively large, thereby improving the space utilization of sub-compartment 111 and contributing to the increase in volumetric energy density of energy storage device 10. V5 / V4 ≤ 0.95 prevents the volume ratio of all batteries 2 within sub-compartment 111 from becoming too large, reducing the assembly precision requirements for installing batteries 2 into sub-compartment 111 and effectively controlling the manufacturing cost of energy storage device 10 within a reasonable range.

[0440] In some embodiments, 0.82 ≤ V5 / V4 ≤ 0.9.

[0441] In this embodiment, V5 / V4 can be any point value of 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, etc., or a range value between any two.

[0442] In this embodiment, 0.82≤V5 / V4≤0.9 takes into account both the volumetric energy density requirements and economic requirements of the energy storage device 10, which helps to further reduce the manufacturing cost of the energy storage device 10 and improve the volumetric energy density of the energy storage device 10.

[0443] In some embodiments, please continue to refer to Figure 13 Along the length X of the housing, the sub-compartment 111 accommodates only one battery 2. This reduces the space occupied by other components of the battery 2 besides the battery cell 21 (e.g., the walls of the battery box 22), which helps to increase the proportion of the battery 2 in the sub-compartment 111 along the length X of the housing and improves the utilization rate of the space in the sub-compartment 111 along the length X of the housing.

[0444] In some embodiments, along the length direction X of the housing, the size of the sub-compartment 111 is L6 and the size of the battery 2 is L5, satisfying: 0.85≤L5 / L6≤0.99.

[0445] As an example, sub-compartment 111 and battery 2 are rectangular parallelepipeds. The length direction of sub-compartment 111 and the length direction of battery 2 are parallel to the width direction Y of the casing. The width direction of sub-compartment 111 and the width direction of battery 2 are parallel to the length direction X of the casing. The height direction of sub-compartment 111 and the height direction of battery 2 are parallel to the height direction Z of the casing. The dimension of sub-compartment 111 along the length direction X of the casing is the width of sub-compartment 111, and the dimension of battery 2 along the length direction X of the casing is the width of battery 2.

[0446] L5 / L6 can be any point value of 0.85, 0.88, 0.9, 0.93, 0.95, 0.97, 0.99, or any range between the two.

[0447] In this embodiment, L5 / L6 ≥ 0.85, ensuring that the battery 2 has a larger dimensional proportion along the length X of the housing within the sub-compartment 111. This fully utilizes the space of the sub-compartment 111 along the length X of the housing, which is beneficial for increasing the volume proportion of all batteries 2 within the sub-compartment 111 and thus improving the volumetric energy density of the energy storage device 10. L5 / L6 ≤ 0.99 ensures that the sub-compartment 111 has sufficient installation margin for the battery 2 along the length X of the housing, reducing the difficulty of installing the battery 2.

[0448] In some embodiments, 0.88 ≤ L5 / L6 ≤ 0.95.

[0449] In this embodiment, L5 / L6 can be any one of the point values ​​of 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, or any range between the two.

[0450] In this embodiment, 0.88≤L5 / L6≤0.95 takes into account both the volumetric energy density of the energy storage device 10 and the ease of installation of the battery 2 in the length direction X of the casing. This not only helps to improve the volumetric energy density of the energy storage device 10, but also further reduces the difficulty of installing the battery 2 in the length direction X of the casing.

[0451] In some embodiments, please refer to Figure 15 , Figure 15 for Figure 13 The energy storage device 10 shown is a DD cross-sectional view. Along the width Y direction of the housing, the sub-compartment 111 accommodates only one battery 2.

[0452] In this embodiment, along the length direction X of the box, the sub-compartment 111 can accommodate one battery 2 or multiple batteries 2.

[0453] In this embodiment, the sub-compartment 111 accommodates only one battery 2 along the width direction Y of the box body. This can reduce the space occupied by other components in the battery 2 besides the battery cell 21 (such as the box wall of the battery box 22), which is beneficial to increasing the proportion of the battery 2 in the sub-compartment 111 along the width direction Y of the box body, and is beneficial to improving the utilization rate of the space in the sub-compartment 111 along the width direction Y of the box body.

[0454] In some embodiments, please continue to refer to Figure 13 Along the height direction Z of the box, the sub-compartment 111 contains multiple batteries 2.

[0455] In this embodiment, along the length direction X of the housing, the sub-compartment 111 can accommodate one battery 2 or multiple batteries 2. Along the width direction Y of the housing, the sub-compartment 111 can accommodate one battery 2 or multiple batteries 2.

[0456] Along the height direction of the sub-compartment 111, the sub-compartment 111 can hold two, three, four, five, six, seven, eight, nine, ten or more batteries 2.

[0457] As an example, along the length X of the housing, sub-compartment 111 holds only one battery 2; along the width Y of the housing, sub-compartment 111 holds only one battery 2; along the height Z of the housing, sub-compartment 111 holds multiple batteries 2. All batteries 2 in each sub-compartment 111 are connected in series. In two adjacent sub-compartments 111, all batteries 2 in one sub-compartment 111 are connected in series to form a first battery pack (battery cluster), and all batteries 2 in the other sub-compartment 111 are connected in series to form a second battery pack (battery cluster). The first battery pack and the second battery pack are connected in parallel. In an embodiment where the housing 1 has an electrical compartment and a main control compartment 15, the main control unit in the main control compartment 15 can realize high-voltage control and communication of the battery clusters, and the current combining unit in the electrical compartment can realize parallel current combining of multiple battery clusters, realizing a safe connection between multiple battery clusters and the DC side of the power conversion system (PCS).

[0458] As an example, along the length X of the housing, each sub-compartment 111 has a support member 113 on both sides. Along the height Z of the housing, the support member 113 is located at the bottom of the battery 2 and is used to support the battery 2. The support member 113 can be installed on the walls of the battery compartment 11 and the partition 112. The support member 113 improves the stability of each battery 2 within the sub-compartment 111; it also maintains a certain distance between adjacent batteries 2 along the height Z of the housing within the sub-compartment 111, minimizing the impact on adjacent batteries 2 when installing or removing one battery 2.

[0459] In this embodiment, the sub-compartment 111 accommodates multiple batteries 2 along the height direction Z of the box, which can reduce the size of a single battery 2 in the height direction Z of the box, thereby reducing the manufacturing difficulty and cost of the battery 2.

[0460] In some embodiments, the number of sub-compartments 111 is less than or equal to 4.

[0461] In this embodiment, sub-compartments 111 can be two, three, or four. Figure 13 In the illustrated embodiment, there are four sub-compartments 111.

[0462] In this embodiment, the number of sub-compartments 111 is less than or equal to 4. The number of separating components between two adjacent sub-compartments 111 in the battery compartment 11 is small, which reduces the space occupied by the separating components in the battery compartment 11, so as to provide more space for the battery 2 and improve the space utilization of the battery compartment 11.

[0463] In some embodiments, the volume of battery 2 is V6, and the sum of the volumes of the casings 211 of the plurality of battery cells 21 of battery 2 is V7, satisfying: 0.5≤V7 / V6≤0.8.

[0464] As an example, please refer to Figure 16 and Figure 17 , Figure 16 This is a schematic diagram of the structure of battery 2 provided in some embodiments of this application; Figure 17 for Figure 16 The diagram shows an EE cross-sectional view of battery 2. Battery 2 includes a battery case 22 and multiple battery cells 21, which are housed within the battery case 22. The battery case 22 may include a first part 221 and a second part 222, which overlap each other to define a space for accommodating the battery cells 21. The volume of the battery case 22 is the volume V6 of battery 2. Taking a rectangular parallelepiped shape as an example, the length, width, and height of the battery case 22 can be measured using a measuring tool, and the volume of the battery case 22 can be calculated from these measurements, thus obtaining the volume V6 of battery 2. It is understood that the product of the length, width, and height of the battery case 22 is the volume of the battery case 22, and a measuring tool such as a ruler can be used.

[0465] The multiple battery cells 21 of battery 2 can be connected in series, parallel, or in a mixed configuration. These multiple battery cells 21 can be connected in series, parallel, or in a mixed configuration via a busbar component 23, which can be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy. Battery 2 may also include a thermal management component, which can be disposed within the battery case 22 or integrated into the wall of the battery case 22. The thermal management component is used to manage the temperature of the battery cells 21. The thermal management component can be a water-cooled plate that contains a fluid medium.

[0466] V7 is the sum of the volumes of the casings 211 of all the individual battery cells 21 in battery 2. The volumes of the casings 211 of all the individual battery cells 21 in battery 2 can be equal, or at least two of the casings 211 of the individual battery cells 21 can have unequal volumes. If the volumes of the casings 211 of all the individual battery cells 21 in battery 2 are equal, the volume of the casing 211 of one individual battery cell 21 can be measured, and then multiplied by the number of individual battery cells 21 in battery 2 to obtain V7. If the volumes of the casings 211 of at least two battery cells 21 in battery 2 are not equal, for example, if the casings 211 of all battery cells 21 in battery 2 are composed of two different volumes of casings 211, the volume of the casing 211 of the first type of battery cell 21 can be measured first, and the volume of the casing 211 of the first type of battery cell 21 can be multiplied by the number of the first type of battery cells 21 in battery 2 to obtain the fifth total volume. Then the volume of the casing 211 of the second type of battery cell 21 can be measured, and the volume of the casing 211 of the second type of battery cell 21 can be multiplied by the number of the second type of battery cells 21 in battery 2 to obtain the sixth total volume. The sum of the fifth total volume and the sixth total volume is V7.

[0467] In this embodiment, V7 / V6 can be any point value or a range value between any two of the following: 0.5, 0.53, 0.55, 0.58, 0.6, 0.63, 0.65, 0.68, 0.7, 0.73, 0.75, 0.78, 0.8.

[0468] In this embodiment, V7 / V6≥0.5 ensures that the volume ratio of all battery cells 21 in the battery 2 is relatively large, which improves the utilization rate of the internal space of the battery 2 and is conducive to improving the volumetric energy density of the battery 2, thereby improving the volumetric energy density of the energy storage device 10; V7 / V6≤0.8 ensures that the volume ratio of all battery cells 21 in the battery 2 is not too large, providing more space for other components of the battery 2 (such as the busbar component 23, thermal management component, etc.), reducing the assembly difficulty and manufacturing cost of the battery 2.

[0469] In some embodiments, 0.58 ≤ V7 / V6 ≤ 0.7.

[0470] In this embodiment, V7 / V6 can be any point value of 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.7, or any range value between the two.

[0471] In this embodiment, 0.58 ≤ V7 / V6 ≤ 0.7, balancing the volumetric energy density of battery 2 with its economic efficiency and ease of assembly. This is beneficial for further improving the volumetric energy density of battery 2, as well as reducing the assembly difficulty and manufacturing cost of battery 2.

[0472] In some embodiments, the number of battery cells 21 in the battery 2 is N8, and the volume of the casing 211 of each battery cell 21 is V3, satisfying: V7 = V3 * N8.

[0473] Where N8 is a positive integer greater than or equal to 2.

[0474] In this embodiment, V7 = V3 * N8, ensuring that the volume of the casing 211 of all battery cells 21 in battery 2 is equal, allowing the selection of battery cells 21 of the same specification. On one hand, this improves the assembly efficiency of battery 2; on the other hand, it reduces the probability of wasted space due to different specifications of battery cells 21 in battery 2.

[0475] In some embodiments, please continue to refer to Figure 16 and Figure 17 Battery 2 includes p*q battery cells 21, arranged in p rows and q columns. Each row of battery cells 21 is set along the length X of the box, and each column of battery cells 21 is set along the width Y of the box. p and q are both positive integers.

[0476] In battery 2, all battery cells 21 are arranged in a rectangular array of p rows and q columns. Each row of battery cells 21 contains q battery cells 21, and each column of battery cells 21 contains p battery cells 21. Battery 2 has multiple battery cells 21, and at least one of p and q is greater than or equal to 2.

[0477] As an example, both p and q are greater than 2, each column of battery cells 21 includes multiple battery cell groups connected in series, each battery cell group includes multiple battery cells 21 connected in parallel, and adjacent columns of battery cells 21 are connected in parallel. Figure 17 In the illustrated embodiment, p = 26, q = 4, there are 26 battery cells 21 in each column of battery cells 21, and every two battery cells 21 are connected in parallel to form 13 battery cell groups. The 13 battery cell groups are connected in series, and the 4 columns of battery cells 21 are connected in parallel.

[0478] In the outer casing 211 of the battery cell 21 ( Figure 16 and Figure 17 In an embodiment where the outer casing 211 is rectangular (not shown), any one of its length, width, and height directions is parallel to the length direction X of the casing, another is parallel to the width direction Y of the casing, and the third is parallel to the height direction Z of the casing. Figure 16 and Figure 17In the illustrated embodiment, the length direction of the outer shell 211 is parallel to the length direction X of the box body, the width direction of the outer shell 211 is parallel to the width direction Y of the box body, and the height direction of the outer shell 211 is parallel to the height direction Z of the box body.

[0479] In an embodiment where a thermal management component is provided in the battery 2, the thermal management component may be provided between two adjacent battery cells 21 in each column of battery cells 21, or between two adjacent battery cells 21 in each row of battery cells 21.

[0480] In this embodiment, all the battery cells 21 of the battery 2 are arranged in a rectangular array, which makes the arrangement of the battery cells 21 of the battery 2 more regular and helps to improve the space utilization of the battery 2.

[0481] In some embodiments, in each row of battery cells 21, the sum of the dimensions of the outer casing 211 of q battery cells 21 along the length direction X of the casing is L7, and the dimension of the battery 2 along the length direction X of the casing is L5, satisfying: 0.8≤L7 / L5≤0.95.

[0482] In each row of battery cells 21, the dimensions of the outer casing 211 of q battery cells 21 along the length X of the box can be equal, or the dimensions of the outer casing 211 of at least two battery cells 21 along the length X of the box can be unequal.

[0483] exist Figure 16 and Figure 17 In the illustrated embodiment, the length direction of the outer shell 211 of the battery cell 21 and the width direction of the battery 2 are parallel to the length direction X of the box. The sum of the dimensions of the outer shells 211 of q battery cells 21 along the length direction X of the box is the sum of the lengths of the outer shells 211 of q battery cells 21. The dimension of the battery 2 along the length direction X of the box is the width of the battery 2.

[0484] In this embodiment, L7 / L5 can be any one of the point values ​​of 0.8, 0.83, 0.85, 0.87, 0.9, 0.92, 0.95, etc., or any range value between two of them.

[0485] A ratio of L7 / L5 ≥ 0.8 ensures that the outer casing 211 of each row of battery cells 21 has a relatively large proportion of the battery 2's dimensions along the length X of the casing. This fully utilizes the space of the battery 2 along the length X of the casing and reduces the gap between adjacent battery cells 21's outer casings along the length X of the casing. This helps to increase the volume ratio of the outer casings 211 of all battery cells 21 within the battery 2, thus improving the volumetric energy density of the battery 2. A ratio of L7 / L5 ≤ 0.95 ensures that the proportion of the outer casing 211 of each row of battery cells 21's dimensions along the length X of the casing in the battery 2 is not too large, reducing the manufacturing difficulty and cost of the battery 2.

[0486] In some embodiments, 0.85 ≤ L7 / L5 ≤ 0.9.

[0487] In this embodiment, L7 / L5 can be any point value of 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, etc., or a range value between any two.

[0488] In this embodiment, 0.85 ≤ L7 / L5 ≤ 0.9, which balances the volumetric energy density of battery 2, the ease of manufacturing battery 2, and the economic requirements of battery 2. This is beneficial for further improving the volumetric energy density of battery 2, as well as reducing the manufacturing difficulty and cost of battery 2.

[0489] In some embodiments, along the length direction X of the housing, the size of the outer casing 211 of each battery cell 21 is L3, satisfying: L3=L7 / q, 0.17m≤L3≤0.6m, 1≤q≤5.

[0490] L3 can be any point value from 0.17m, 0.2m, 0.25m, 0.3m, 0.35m, 0.4m, 0.45m, 0.5m, 0.55m, 0.6m, or any range between two values. q can be 1, 2, 3, 4, or 5.

[0491] In this embodiment, L3 = L7 / q, ensuring that the outer casing 211 of each row of battery cells 21 in the battery 2 has the same size along the length X of the casing. Battery cells 21 in each row can be of the same specification. Since 0.17m ≤ L3 ≤ 0.6m and 1 ≤ q ≤ 5, each battery cell 21 in each row has a relatively large size, and the number of batteries 2 is not excessive. This reduces the space occupied by the outer casing 211 along the length X of the casing, which helps to increase the proportion of the outer casing 211 of each row of battery cells in the battery 2 along the length X of the casing, thus improving the space utilization rate of the battery 2 and increasing its volumetric energy density.

[0492] In some embodiments, q = 4, 0.2m ≤ L3 ≤ 0.3m.

[0493] In this embodiment, L3 can be any point value or a range value between any two of the following: 0.2m, 0.21m, 0.22m, 0.23m, 0.24m, 0.25m, 0.26m, 0.27m, 0.28m, 0.29m, and 0.3m.

[0494] When there are four battery cells 21 in each row of battery cells 21, the size of the outer casing 211 of the battery cell 21 is controlled within the range of 0.2m to 0.3m, so that the battery 2 has a high volumetric energy density.

[0495] In some embodiments, q = 2, 0.4m ≤ L3 ≤ 0.6m.

[0496] In this embodiment, L3 can be any one of the following values: 0.4m, 0.43m, 0.45m, 0.48m, 0.5m, 0.53m, 0.55m, 0.58m, 0.6m, or a range between any two.

[0497] When there are two battery cells 21 in each row of battery cells 21, the size of the outer casing 211 of the battery cell 21 is controlled within the range of 0.4m≤L3≤0.6m, so that the battery 2 has a high volumetric energy density.

[0498] In some embodiments, in each row of battery cells 21, the sum of the dimensions of the outer casing 211 of p battery cells 21 along the width direction Y of the casing is D7, and the dimension of the battery 2 along the width direction Y of the casing is D5, satisfying: 0.75≤D7 / D5≤0.95.

[0499] In each row of battery cells 21, the dimensions of the outer casing 211 of p battery cells 21 along the width direction Y of the box can be equal, or the dimensions of the outer casing 211 of at least two battery cells 21 along the width direction Y of the box can be unequal.

[0500] exist Figure 16 and Figure 17 In the illustrated embodiment, the width direction of the outer casing 211 of the battery cell 21 and the length direction of the battery 2 are parallel to the width direction Y of the box. The sum of the dimensions of the outer casings 211 of p battery cells 21 along the width direction Y of the box is the sum of the widths of the outer casings 211 of p battery cells 21. The dimension of the battery 2 along the width direction Y of the box is the length of the battery 2.

[0501] In this embodiment, D7 / D5 can be any point value of 0.75, 0.78, 0.8, 0.83, 0.85, 0.87, 0.9, 0.92, 0.95, or any range value between two of them.

[0502] In some embodiments, D7 / D5 ≥ 0.75, resulting in a larger proportion of the casing 211 of each row of battery cells 21 in the width direction Y of the battery 2, making full use of the space of the battery 2 in the width direction Y of the battery 2, reducing the gap between the casings 211 of two adjacent battery cells 21 in the width direction Y of the battery 2, which is beneficial to increasing the volume proportion of the casings 211 of all battery cells 21 in the battery 2, and thus improving the volumetric energy density of the battery 2. D7 / D5 ≤ 0.95, ensuring that the proportion of the casing 211 of each row of battery cells 21 in the width direction Y of the battery 2 is not too large, reducing the manufacturing difficulty and cost of the battery 2.

[0503] In some embodiments, 0.82 ≤ D7 / D5 ≤ 0.9.

[0504] In this embodiment, D7 / D5 can be any point value of 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, etc., or a range value between any two.

[0505] In this embodiment, D7 / D5 balances the volumetric energy density of battery 2, the ease of manufacturing battery 2, and the economic requirements of battery 2. This is beneficial for further improving the volumetric energy density of battery 2, as well as reducing the manufacturing difficulty and cost of battery 2.

[0506] In some embodiments, along the width direction Y of the housing, the size of the outer casing 211 of each battery cell 21 is D3, satisfying: D3=D7 / p, 0.04m≤D3≤0.12m, 20≤p≤30.

[0507] D3 can be any point value from 0.04m, 0.05m, 0.06m, 0.07m, 0.08m, 0.09m, 0.1m, 0.11m, 0.12m, or any range between two values. p can be 20, 21, 22, 23, 24, 25, 26, 28, 29, or 30.

[0508] In this embodiment, D3 = D7 / p, ensuring that the outer casing 211 of each battery cell 21 in each row of the battery 2 has the same dimension along the width Y direction of the casing. Battery cells 21 in each row can be of the same specification. Since 0.04m ≤ D3 ≤ 0.12m and 20 ≤ p ≤ 30, each battery cell 21 in each row has a relatively large size, and the number of batteries 2 is not excessive. This reduces the space occupied by the outer casing 211 along the width Y direction of the casing, which helps to increase the proportion of the outer casing 211 of each row of battery cells in the battery 2 along the width Y direction of the casing, thus improving the space utilization rate of the battery 2 and increasing its volumetric energy density.

[0509] In some embodiments, 0.06m≤D3≤0.08m, 24≤p≤28.

[0510] In this embodiment, D3 can be any point value or a range value between any two of the following: 0.06m, 0.063m, 0.065m, 0.068m, 0.07m, 0.073m, 0.075m, 0.078m, 0.08m. p can be 24, 25, 26, or 28.

[0511] In this embodiment, 0.06m≤D3≤0.08m, 24≤p≤28, such battery 2 has a high volumetric energy density.

[0512] In some embodiments, the outer casing 211 of the battery cell 21 has a dimension of H3 along the height direction Z of the housing, and the battery 2 has a dimension of H5 along the height direction Z of the housing, satisfying: 0.75≤H3 / H5≤0.95.

[0513] exist Figure 16 and Figure 17 In the illustrated embodiment, the height direction of the outer casing 211 of the battery cell 21 and the height direction of the battery 2 are parallel to the height direction Z of the housing. The dimension of the outer casing 211 of the battery cell 21 along the height direction Z of the housing is the height of the outer casing 211 of the battery cell 21, and the dimension of the battery 2 along the height direction Z of the housing is the height of the battery 2.

[0514] H3 / H5 can be any point value from 0.75, 0.78, 0.8, 0.83, 0.85, 0.87, 0.9, 0.92, 0.95, or any range between two values.

[0515] In this embodiment, H3 / H5 ≥ 0.75 ensures that the outer casing 211 of the battery cell 21 accounts for a large proportion of the battery 2's dimensions along the height Z direction of the casing, making full use of the space of the battery 2 in the height Z direction of the casing. This is beneficial for increasing the volume proportion of the outer casing 211 of all battery cells 21 within the battery 2, and thus improving the volumetric energy density of the battery 2. H3 / H5 ≤ 0.95 ensures that the outer casing 211 of the battery cell 21 does not account for an excessively large proportion of the battery 2's dimensions along the height Z direction of the casing, reducing the manufacturing difficulty and cost of the battery 2.

[0516] In some embodiments, 0.82 ≤ H3 / H5 ≤ 0.9.

[0517] In this embodiment, H3 / H5 can be any point value of 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, etc., or a range value between any two.

[0518] In this embodiment, 0.82 ≤ H3 / H5 ≤ 0.9, which balances the volumetric energy density of battery 2, the ease of manufacturing battery 2, and the economic requirements of battery 2. This is beneficial for further improving the volumetric energy density of battery 2, as well as reducing the manufacturing difficulty and cost of battery 2.

[0519] In some embodiments, 0.17m ≤ H3 ≤ 0.6m.

[0520] H3 can be any point value or a range between any two of the following: 0.17m, 0.2m, 0.25m, 0.3m, 0.35m, 0.4m, 0.45m, 0.5m, 0.55m, 0.6m.

[0521] In this embodiment, H3 ≥ 0.17m, which makes the size of the outer casing 211 of the battery cell 21 larger along the height Z direction of the casing, which is beneficial to increasing the proportion of the outer casing 211 of the battery cell 21 in the battery 2 along the height Z direction of the casing, and thus improving the volumetric energy density of the battery cell 21. H3 ≤ 0.6m, which prevents the size of the outer casing 211 of the battery cell 21 from being too large along the height Z direction of the casing, effectively reducing the manufacturing difficulty and cost of the battery cell 21.

[0522] In some embodiments, 0.2m ≤ H3 ≤ 0.45m.

[0523] In this embodiment, H3 can be any point value or a range value between any two of the following: 0.2m, 0.23m, 0.25m, 0.28m, 0.3m, 0.33m, 0.35m, 0.38m, 0.4m, 0.43m, 0.45m.

[0524] In this embodiment, 0.2m ≤ H3 ≤ 0.45m balances the volumetric energy density of battery 2, the ease of manufacturing battery 2, and the economic requirements of battery 2. This is beneficial for further improving the volumetric energy density of battery 2, as well as reducing the manufacturing difficulty and cost of battery 2.

[0525] In some embodiments, please refer to Figures 18-21 , Figure 18 Axonometric view of a battery cell 21 provided in some embodiments of this application; Figure 19 for Figure 18 An exploded view of the battery cell 21 shown; Figure 20 for Figure 18 The exploded cross-sectional view of the battery cell 21 shown is taken along the UW plane. Figure 21 for Figure 18The diagram shows an exploded cross-sectional view of the battery cell 21 taken along the VW plane. The battery cell 21 also includes at least one electrode assembly 213, which is housed within a housing 211. The housing 211 is in the shape of a right parallelepiped. The dimensions of the housing 211 in the first direction U are W1, in the second direction V are T1, and in the third direction W are K1. One of the three directions—the first direction U, the second direction V, and the third direction W—is parallel to the length direction X of the housing, another is parallel to the width direction Y of the housing, and the third is parallel to the height direction Z of the housing. The outer shell 211 includes a first wall 2113 and a second wall 2114 disposed opposite to each other along a first direction U, a third wall 2115 and a fourth wall 2116 disposed opposite to each other along a second direction V, and a fifth wall 2117 and a sixth wall 2118 disposed opposite to each other along a third direction W. The sum of the thicknesses of the first wall 2113 and the second wall 2114 is a, the sum of the thicknesses of the third wall 2115 and the fourth wall 2116 is b, and the sum of the thicknesses of the fifth wall 2117 and the sixth wall 2118 is c, satisfying: (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≥0.9.

[0526] W1*T1*K1 represents the volume of the outer shell 211, i.e., V3 = W1*T1*K1.

[0527] There may be one or more electrode components 213 inside the housing 211. If there are multiple electrode components 213 inside the housing 211, the multiple electrode components 213 may be connected in parallel.

[0528] The outer shell 211 is in the shape of a right parallelepiped, which can be a cuboid, cube, etc. Of the six walls of the outer shell 211, four walls can form the outer shell 211, and the other two walls can be end caps 2112; alternatively, five walls can form the outer shell 211, and the remaining wall can be an end cap 2112. The dimensions of the outer shell 211 in the first direction U, the dimensions of the outer shell 211 in the second direction V, the dimensions of the outer shell 211 in the third direction W, the thicknesses of the first wall 2113, the second wall 2114, the third wall 2115, the fourth wall 2116, the fifth wall 2117, and the sixth wall 2118 can all be measured using vernier calipers.

[0529] As an example, the first wall 2113, the second wall 2114, the third wall 2115, the fourth wall 2116, the fifth wall 2117, and the sixth wall 2118 are all aluminum alloys. The aluminum alloys comprise the following components by mass percentage: aluminum ≥ 96.7%, copper ≤ 0.05% ≤ 0.2%, iron ≤ 0.7%, manganese ≤ 1.5%, silicon ≤ 0.6%, zinc ≤ 0.1%, other individual element components ≤ 0.05%, and total other element components ≤ 0.15%.

[0530] As an example, the first direction U is the length direction of the outer casing 211 of the battery cell 21, the second direction V is the width direction of the outer casing 211 of the battery cell 21, and the third direction W is the height direction of the outer casing 211 of the battery cell 21. It can be understood that W1 is the length of the outer casing 211 of the battery cell 21, T1 is the width of the outer casing 211 of the battery cell 21, and K1 is the height of the outer casing 211 of the battery cell 21.

[0531] (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1) can be any point value or a range between any two of the following: 0.9, 0.905, 0.91, 0.915, 0.92, 0.925, 0.93, 0.935, 0.94, 0.945, 0.95, 0.955, 0.96, 0.965, 0.97, 0.975, 0.98, 0.985, 0.99, 0.995.

[0532] Wherein, (W1-a)*(T1-b)*(K1-c) can be understood as the volume of the internal space of the outer shell 211, that is, the volume of the space enclosed by the inner surface of the outer shell 211. W1*T1*K1 is the volume of the outer shell 211. It should be noted that in the embodiment where a bulge 2112b protruding from the outer surface 2112a of the end cap 2112 is formed on the end cap 2112 of the outer shell 211, the volume of the outer shell 211 does not include the volume of the bulge 2112b.

[0533] If the outer surfaces of the six walls of the outer shell 211 are all planar, then W1, T1, and K1 are measured with each outer surface of the wall as a reference. For example, if the outer surfaces of the fifth wall 2117 and the sixth wall 2118 are both planar, then K1 is the distance between the outer surfaces of the fifth wall 2117 and the sixth wall 2118 along the third direction W.

[0534] If a protrusion or recess is formed on the outer surface of one of the walls of the outer casing 211, W1, T1, and K1 are measured with reference to the planar area of ​​that outer surface (i.e., the area other than the protrusion or recess). For example, if the outer surface of the fifth wall 2117 is planar and the outer surface of the sixth wall 2118 has a first protrusion (e.g., if the sixth wall 2118 is an end cap 2112, and the protrusion formed on the end cap 2112 is the first protrusion), then K1 is the distance along the third direction W between the planar area of ​​the outer surface of the sixth wall 2118 excluding the first protrusion and the outer surface of the fifth wall 2117. If the outer surface of the sixth wall 2118 has a first protrusion and the outer surface of the fifth wall 2117 has a second protrusion, then K1 is the distance along the third direction W between the planar area of ​​the outer surface of the fifth wall 2117 excluding the second protrusion and the planar area of ​​the outer surface of the sixth wall 2118 excluding the first protrusion.

[0535] If all six walls of the outer casing 211 are of uniform thickness, the thickness of the wall can be obtained by measuring the distance between its outer and inner surfaces from any position on each wall. If one wall of the outer casing 211 is of non-uniform thickness, the thickness of the wall is obtained by measuring the distance between its outer and inner surfaces from the point of maximum thickness. In other words, if the thickness of a wall is non-uniform, the maximum thickness of that wall is used to calculate a, b, or c.

[0536] In such a battery cell 21, the ratio of the volume of the internal space of the outer shell 211 to the volume of the outer shell 211 is greater than 0.9, which makes the internal space of the outer shell 211 account for a large proportion. The space that the outer shell 211 can use to accommodate the electrode assembly 213 is increased. Under the same chemical system, the volumetric energy density of the battery cell 21 can be improved.

[0537] The following is a detailed explanation using specific experimental data:

[0538] In the experiment, the battery cell 21 is a square-shell battery cell, the outer shell 2111 of the outer shell 211 is a hollow structure with one end open, and the end cap 2112 in the battery cell 21 is one.

[0539] Table 2

[0540]

[0541]

[0542] According to Table 2 above, comparing Examples 13-16 and Comparative Example 3, it can be seen that when the cathode material of battery cell 21 includes lithium phosphate, (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≥0.9 can effectively improve the volumetric energy density of battery cell 21. Comparing Examples 17-20 and Comparative Example 4, it can be seen that when the cathode material of battery cell 21 includes lithium transition metal oxide, (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≥0.9 can effectively improve the volumetric energy density of battery cell 21. Comparing Examples 21-24 and Comparative Example 5, it can be seen that when battery cell 21 is a sodium-ion battery cell, (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≥0.9 can effectively improve the volumetric energy density of battery cell 21.

[0543] In some embodiments, (W1-a) / W1≥0.97, (T1-b) / T1≥0.965, and (K1-c) / K1≥0.965.

[0544] By setting the ratio of W1-a to W1 to 0.97 or higher, the length of the internal space of the casing 211 is increased while the length of the battery cell 21 remains unchanged, thereby accommodating a longer electrode assembly 213; under the same chemical material system, the volumetric energy density of the battery cell 21 can be improved. (W1-a) / W1 can be a point value of any one of 0.97, 0.975, 0.98, 0.985, 0.99, 0.995, or a range between any two.

[0545] By setting the ratio of T1-b to T1 to 0.965 or higher, the width of the internal space of the casing 211 is increased while the width of the battery cell 21 remains unchanged, thereby accommodating a wider electrode assembly 213; under the same chemical material system, the volumetric energy density of the battery cell 21 can be improved. (T1-b) / T1 can be a point value of any one of 0.965, 0.97, 0.975, 0.98, 0.985, 0.99, 0.995, or a range between any two.

[0546] By setting the ratio of K1-c to K1 to 0.965 or higher, the height of the internal space of the casing 211 is increased while the height of the battery cell 21 remains constant, thereby accommodating a taller electrode assembly 213; under the same chemical material system, the volumetric energy density of the battery cell 21 can be improved. (K1-c) / K1 can be a point value of any one of 0.965, 0.97, 0.975, 0.98, 0.98.5, 0.99, 0.995, or a range between any two.

[0547] In some embodiments, please continue to refer to Figures 18-21 The outer casing 211 includes a housing 2111 and an end cap 2112. The housing 2111 has an opening, and the end cap 2112 closes to the opening. The end cap 2112 is provided with electrode terminals 212. The housing 2111 includes an integrally formed first wall 2113, a second wall 2114, a third wall 2115, a fourth wall 2116, and a fifth wall 2117, and the end cap 2112 is a sixth wall 2118.

[0548] In this embodiment, the housing 2111 is a hollow structure with an opening at one end, and there is one end cap 2112 in the housing 211. The end cap 2112 is separately disposed from the housing 2111 and connected thereto. The end cap 2112 and the housing 2111 can be welded or rolled together, etc.

[0549] When assembling battery 2, the electrode terminal 212 can be installed on the end cover 2112 first, then the electrode assembly 213 can be housed in the housing 2111, and then the end cover 2112 can be closed on the opening of the housing 2111. This can reduce the difficulty of installing the electrode assembly 213 in the housing 211 and the difficulty of installing the electrode terminal 212 in the housing 211.

[0550] In some embodiments, please continue to refer to Figure 20 and Figure 21 The thickness of the first wall 2113 and the second wall 2114 is a1, 2*a1=a; the thickness of the third wall 2115 and the fourth wall 2116 is b1, 2*b1=b; the thickness of the fifth wall 2117 is c1, and the thickness of the sixth wall 2118 is c2, c2>c1, c1>a1, c1>b1. 0.5mm≤a1≤1.5mm, 0.5≤b1≤1.5mm, 1.0mm≤c1≤2.5mm, 1.5mm≤c2≤4mm.

[0551] In order to reduce the possibility of interference between the electrode assembly 213 and the housing 2111 during the installation process and to reduce the risk of damage to the electrode assembly 213, a certain assembly gap (i.e., housing gap) will be left for the electrode assembly 213 when designing the housing 2111. This assembly gap can be 0.8-2mm.

[0552] In addition, in order to reduce the possibility of internal short circuits in the battery cell 21, an insulating component can be installed inside the casing 211. However, the insulating component will inevitably occupy part of the internal space of the casing 211, thereby reducing the space available for the electrode assembly 213 and the electrolyte.

[0553] In some embodiments, the battery cell 21 further includes a first insulating member 214 and a second insulating member 215. The first insulating member 214 is disposed between the fifth wall 2117 and the electrode assembly 213 and abuts against the fifth wall 2117. The second insulating member 215 is disposed between the sixth wall 2118 and the electrode assembly 213 and abuts against the sixth wall 2118. The maximum dimension of the first insulating member 214 in the third direction W is e1, and the maximum dimension of the second insulating member 215 in the third direction W is e2, satisfying: (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e1-e2) / (W1*T1*K1)≥0.88, 0.3mm≤e1≤1.2mm, and 2mm≤e2≤10mm.

[0554] (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e1-e2) / (W1*T1*K1) can be any point value or a range between any two of the following: 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99.

[0555] e1 can be a point value or a range value between any two of the following: 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm.

[0556] e2 can be a point value of any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.

[0557] In this embodiment, W1-a-1.6mm means that when the assembly gap between the electrode assembly 213 and the housing 2111 is 0.8mm, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the first direction U. T1-b-1.6mm means that when the assembly gap between the electrode assembly 213 and the housing 2111 is 0.8mm, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the second direction V. K1-c-e1-e2 means that when a first insulating member 214 abutting against the fifth wall 2117 is provided between the fifth wall 2117 and the electrode assembly 213, and a second insulating member 215 abutting against the sixth wall 2118 is provided between the sixth wall 2118 and the electrode assembly 213, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the third direction W. The first insulating member 214 can be a bottom plate, and the second insulating member 215 can be a lower plastic.

[0558] In this embodiment, (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e1-e2) / (W1*T1*K1)≥0.88, which increases the space left inside the outer casing 211 for the electrode assembly 213, allowing for a larger electrode assembly 213 to be accommodated, thereby further improving the volumetric energy density of the battery cell 21.

[0559] In some embodiments, the battery cell 21 further includes a first insulating member 214 and a second insulating member 215. The first insulating member 214 is disposed between the fifth wall 2117 and the electrode assembly 213 and abuts against the fifth wall 2117. The second insulating member 215 is disposed between the sixth wall 2118 and the electrode assembly 213 and abuts against the sixth wall 2118. The maximum dimension of the first insulating member 214 in the third direction W is e1, and the maximum dimension of the second insulating member 215 in the third direction W is e2, satisfying: (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1)≥0.85, 0.3mm≤e1≤1.2mm, and 2mm≤e2≤10mm.

[0560] (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1) can be any point value or a range between any two of the following: 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99.

[0561] e1 can be a point value or a range value between any two of the following: 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm.

[0562] e2 can be a point value of any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.

[0563] In this embodiment, W1-a-4mm means that when the assembly gap between the electrode assembly 213 and the housing 2111 is 2mm, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the first direction U. T1-b-4mm means that when the assembly gap between the electrode assembly 213 and the housing 2111 is 2mm, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the second direction V. K1-c-e1-e2 means that when a first insulating member 214 abutting against the fifth wall 2117 is provided between the fifth wall 2117 and the electrode assembly 213, and a second insulating member 215 abutting against the sixth wall 2118 is provided between the sixth wall 2118 and the electrode assembly 213, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the third direction W.

[0564] In this embodiment, (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1)≥0.85, which increases the space left inside the outer casing 211 for the electrode assembly 213, allowing for a larger electrode assembly 213 to be accommodated, thereby further improving the volumetric energy density of the battery cell 21.

[0565] In some embodiments, W1≥T1, the first direction U is parallel to the length direction X of the box, the second direction V is parallel to the width direction Y of the box, and the third direction W is parallel to the height direction Z of the box.

[0566] As an example, the first direction U is the length direction of the outer casing 211 of the battery cell 21, the second direction V is the width direction of the outer casing 211 of the battery cell 21, and the third direction W is the height direction of the outer casing 211 of the battery cell 21, such that the length direction of the outer casing 211 is parallel to the length direction X of the box, the width direction of the outer casing 211 is parallel to the width direction Y of the box, and the height direction of the outer casing 211 is parallel to the height direction Z of the box.

[0567] When the end cap 2112 is provided at only one end of the housing 2111 and W1≥T1, the end cap 2112 and the fifth wall 2117 of the housing 211 are arranged opposite each other along the height direction Z of the box, the first wall 2113 and the second wall 2114 of the housing 211 are arranged opposite each other along the length direction X of the box, and the third wall 2115 and the fourth wall 2116 of the housing 211 are arranged opposite each other along the width direction Y of the box. This is beneficial to increase the volume ratio of all battery cells 21 in the battery compartment 11.

[0568] In some embodiments, please refer to Figures 22-25 , Figure 22 Axonometric view of a battery cell 21 provided in other embodiments of this application; Figure 23 for Figure 22 An exploded view of the battery cell 21 shown; Figure 24 for Figure 22 The exploded cross-sectional view of the battery cell 21 shown is taken along the UW plane. Figure 25 for Figure 22 The diagram shows an exploded cross-sectional view of the battery cell 21 taken along the VW plane. The housing 211 includes a shell 2111 and two end caps 2112. The shell 2111 has two openings disposed opposite each other along a third direction W. The two end caps 2112 respectively cover the two openings, and at least one end cap 2112 is provided with an electrode terminal 212. The shell 2111 includes an integrally formed first wall 2113, a second wall 2114, a third wall 2115, and a fourth wall 2116. The two end caps 2112 are a fifth wall 2117 and a sixth wall 2118, respectively.

[0569] In this embodiment, the housing 2111 is a hollow structure with openings at both ends, and there are two end caps 2112 in the housing 211, which respectively close the openings at both ends of the housing 2111.

[0570] In some embodiments, please continue to refer to Figure 24 and Figure 25 The thickness of the first wall 2113 and the thickness of the second wall 2114 are both a1, 2*a1=a; the thickness of the third wall 2115 and the thickness of the fourth wall 2116 are both b1, 2*b1=b; the thickness of the fifth wall 2117 and the thickness of the sixth wall 2118 are c1, 2*c1=c, c1>a1, c1>b1. 0.5mm≤a1≤1.5mm, 0.5≤b1≤1.5mm, 1.0mm≤c1≤4mm.

[0571] In order to reduce the possibility of interference between the electrode assembly 213 and the housing 2111 during the installation process and to reduce the risk of damage to the electrode assembly 213, a certain assembly gap (i.e., housing gap) will be left for the electrode assembly 213 when designing the housing 2111. This assembly gap can be 0.8-2mm.

[0572] In addition, in order to reduce the possibility of internal short circuits in the battery cell 21, an insulating component can be installed inside the casing 211. However, the insulating component will inevitably occupy part of the internal space of the casing 211, thereby reducing the space available for the electrode assembly 213 and the electrolyte.

[0573] In some embodiments, the battery cell 21 further includes a third insulating member 216 and a fourth insulating member 217. The third insulating member 216 is disposed between the fifth wall 2117 and the electrode assembly 213 and abuts against the fifth wall 2117. The fourth insulating member 217 is disposed between the sixth wall 2118 and the electrode assembly 213 and abuts against the sixth wall 2118. The maximum dimension of the third insulating member 216 in the third direction W is e3, and the maximum dimension of the fourth insulating member 217 in the third direction W is e4, satisfying: (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e3-e4) / (W1*T1*K1)≥0.88, 2mm≤e3≤10mm, and 2mm≤e4≤10mm.

[0574] (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e3-e4) / (W1*T1*K1) can be any point value or a range between any two of the following: 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99.

[0575] e3 can be a point value of any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.

[0576] e4 can be a point value of any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.

[0577] In this embodiment, W1-a-1.6mm means that when the assembly gap between the electrode assembly 213 and the housing 2111 is 0.8mm, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the first direction U. T1-b-1.6mm means that when the assembly gap between the electrode assembly 213 and the housing 2111 is 0.8mm, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the second direction V. K1-c-e3-e4 means that when a third insulating member 216 abutting against the fifth wall 2117 is provided between the fifth wall 2117 and the electrode assembly 213, and a fourth insulating member 217 abutting against the sixth wall 2118 is provided between the sixth wall 2118 and the electrode assembly 213, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the third direction W. Both the third insulating member 216 and the fourth insulating member 217 can be made of plastic.

[0578] In this embodiment, W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e3-e4) / (W1*T1*K1)≥0.88, which increases the space left inside the outer casing 211 for the electrode assembly 213, allowing for a larger electrode assembly 213 to be accommodated, thereby further improving the volumetric energy density of the battery cell 21.

[0579] In some embodiments, the battery cell 21 further includes a third insulating member 216 and a fourth insulating member 217. The third insulating member 216 is disposed between the fifth wall 2117 and the electrode assembly 213 and abuts against the fifth wall 2117. The fourth insulating member 217 is disposed between the sixth wall 2118 and the electrode assembly 213 and abuts against the sixth wall 2118. The maximum dimension of the third insulating member 216 in the third direction W is e3, and the maximum dimension of the fourth insulating member 217 in the third direction W is e4, satisfying: (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1)≥0.85, 2mm≤e3≤10mm, and 2mm≤e4≤10mm.

[0580] (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1) can be any point value or a range between any two of the following: 0.85, 0.86, 0.87, 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99.

[0581] e3 can be a point value of any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.

[0582] e4 can be a point value of any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.

[0583] In this embodiment, W1-a-4mm means: when the assembly gap between the electrode assembly 213 and the housing 2111 is 2mm, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the first direction U. T1-b-4mm means: when the assembly gap between the electrode assembly 213 and the housing 2111 is 2mm, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the second direction V. K1-c-e3-e4 means: when a third insulating member 216 abutting against the fifth wall 2117 is provided between the fifth wall 2117 and the electrode assembly 213, and a fourth insulating member 217 abutting against the sixth wall 2118 is provided between the sixth wall 2118 and the electrode assembly 213, the maximum size of the internal space of the housing 211 reserved for the electrode assembly 213 along the third direction W.

[0584] In this embodiment, (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1)≥0.85, which increases the space left inside the outer casing 211 for the electrode assembly 213, allowing for a larger electrode assembly 213 to be accommodated, thereby further improving the volumetric energy density of the battery cell 21.

[0585] In some embodiments, W1≥T1, the first direction U is parallel to the height direction Z of the box, the second direction V is parallel to the width direction Y of the box, and the third direction W is parallel to the length direction X of the box.

[0586] As an example, the first direction U is the length direction of the outer casing 211 of the battery cell 21, the second direction V is the width direction of the outer casing 211 of the battery cell 21, and the third direction W is the height direction of the outer casing 211 of the battery cell 21, such that the length direction of the outer casing 211 is parallel to the height direction Z of the box, the width direction of the outer casing 211 is parallel to the width direction Y of the box, and the height direction of the outer casing 211 is parallel to the length direction X of the box.

[0587] In some embodiments, 0.0026m 3 ≤W1*T1*K1≤0.008m 3 .

[0588] In this embodiment, W1*T1*K1 can be 0.0026m 3 0.0028m 3 0.0031m 3 0.0035m 3 0.0038m 3 0.004m 3 0.0042m 3 0.0045m 3 0.0048m 3 0.005m 3 0.0052m 3 0.0055m 3 0.0058m 3 0.006m 3 0.0062m 3 0.0065m 3 0.0068m 3 0.007m 3 0.0072m 3 0.0073m 3 0.0075m 3 0.0078m 3 0.008m 3 The point value of any one of them or the range value between any two.

[0589] In some embodiments, 0.004m 3 ≤W1*T1*K1≤0.006m 3 .

[0590] In this embodiment, it can be 0.004m 3 0.0041m 3 0.0042m 3 0.0043m 3 0.0044m 3 0.0045m3 0.0046m 3 0.0047m 3 0.0048m 3 0.0049m 3 0.005m 3 0.0051m 3 0.0052m 3 0.0053m 3 0.0054m 3 0.0055m 3 0.0056m 3 0.0057m 3 0.0058m 3 0.0059m 3 0.006m 3 The point value of any one of them or the range value between any two.

[0591] With end caps 2112 provided at both ends of the housing 2111 and W1≥T1, the two end caps 2112 of the housing 211 are arranged along the length direction X of the box, the first wall 2113 and the second wall 2114 of the housing 211 are arranged along the height direction Z of the box, and the third wall 2115 and the fourth wall 2116 of the housing 211 are arranged opposite to each other along the width direction Y of the box, which is beneficial to increasing the volume ratio of all battery cells 21 in the battery compartment 11.

[0592] In some embodiments, the positive electrode material of the battery cell 21 includes lithium phosphate, and the capacity of the battery cell 21 is C, which satisfies: C≥350Ah, C / ((W1-a)*(T1-b)*(K1-c))≥118Ah / L.

[0593] Lithium-containing phosphates include, but are not limited to, at least one of the following: lithium iron phosphate (such as LiFePO4 (also known as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites.

[0594] When the positive electrode material of the battery cell 21 includes lithium phosphate and C≥350Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) to above 118Ah / L can increase the volume ratio of the internal space of the casing 211 of the battery cell 21, which is beneficial to achieving a ratio of the internal space volume of the casing 211 to the volume of the casing 211 of the battery cell 21 to above 0.9.

[0595] In some embodiments, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, and the capacity of the battery cell 21 is C, which satisfies: C≥650Ah, C / ((W1-a)*(T1-b)*(K1-c))≥190Ah / L.

[0596] Lithium transition metal oxides include, but are not limited to: lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, and lithium nickel cobalt manganese oxides (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0597] When the cathode material of the battery cell 21 includes lithium transition metal oxide and C≥650Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) to above 190Ah / L can increase the volume ratio of the internal space of the casing 211 of the battery cell 21, which is beneficial to achieving a ratio of the internal space volume of the casing 211 to the volume of the casing 211 of the battery cell 21 to above 0.9.

[0598] In some embodiments, the battery cell 21 is a sodium-ion battery cell 21, and the capacity of the battery cell 21 is C, which satisfies: C≥260Ah, C / ((W1-a)*(T1-b)*(K1-c))≥87Ah / L.

[0599] When the battery cell 21 is a sodium-ion battery cell 21 and C≥260Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) to above 87Ah / L can increase the volume ratio of the internal space of the battery cell 21's casing 211, which is beneficial to achieving a ratio of the internal space volume of the battery cell 21's casing 211 to the volume of the casing 211 to above 0.9.

[0600] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0601] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An energy storage device, characterized in that, The volume of the casing of each battery cell in the energy storage device is greater than or equal to 0.0026 m³. 3 The energy storage device includes: The housing has a battery compartment, which includes multiple sub-compartments arranged along the length of the housing. The battery compartment is provided with a separator, and two adjacent sub-compartments are separated by the separator. Multiple batteries, each of the sub-compartments contains at least one of the batteries, each battery comprising p*q battery cells, the p*q battery cells being arranged in p rows and q columns, each row of battery cells being arranged along the length direction of the housing, and each column of battery cells being arranged along the width direction of the housing, where p and q are both positive integers, each battery cell comprising a housing and electrode terminals, the electrode terminals being disposed on the housing; Wherein, the volume of the battery compartment is V1, the sum of the volumes of the outer shells of all the battery cells in the battery compartment is V2, and 0.4≤V2 / V1≤0.

95.

2. The energy storage device as described in claim 1, characterized in that, 0.5≤V2 / V1≤0.

85.

3. The energy storage device as described in claim 2, characterized in that, 0.52≤V2 / V1≤0.

75.

4. The energy storage device as described in claim 1, characterized in that, The volume of the outer shell is V3, and 0.0001≤V3 / V1≤0.00025.

5. The energy storage device as described in claim 4, characterized in that, 0.00015≤V3 / V1≤0.0002.

6. The energy storage device as described in claim 1, characterized in that, The volume of the outer shell is V3, 0.0035m. 3 ≤V3≤0.008m 3 .

7. The energy storage device as described in claim 6, characterized in that, 0.004m 3 ≤V3≤0.006m 3 。 8. The energy storage device as described in claim 1, characterized in that, The volume of the box is V, which satisfies: 0.45≤V1 / V≤0.

75.

9. The energy storage device as described in claim 8, characterized in that, 0.55≤V1 / V≤0.

65.

10. The energy storage device as described in claim 8, characterized in that, 20m 3 ≤V≤80m 3 。 11. The energy storage device as described in claim 10, characterized in that, 35m 3 ≤V≤50m 3 。 12. The energy storage device as claimed in claim 1, characterized in that, The battery compartment contains a plurality of battery cells arranged along the length of the housing. Along the length direction, the size of the battery compartment is L1, and the sum of the sizes of the outer shells of the multiple battery cells arranged in the battery compartment is L2, satisfying: 0.6≤L2 / L1≤0.

95.

13. The energy storage device as described in claim 12, characterized in that, 0.75≤L2 / L1≤0.

9.

14. The energy storage device as described in claim 12, characterized in that, Along the length direction, the size of the outer shell of each battery cell is L3, and N2 battery cells are arranged in the battery compartment, satisfying: L2 = L3 * N2.

15. The energy storage device as described in claim 14, characterized in that, 0.03≤L3 / L1≤0.

12.

16. The energy storage device as described in claim 15, characterized in that, 0.055≤L3 / L1≤0.

09.

17. The energy storage device as claimed in claim 14, characterized in that, 0.17m≤L3≤0.6m.

18. The energy storage device as claimed in claim 17, characterized in that, 0.2m≤L3≤0.45m.

19. The energy storage device as described in claim 12, characterized in that, Along the length direction, the size of the box is L, which satisfies: 0.65≤L1 / L≤0.

95.

20. The energy storage device as described in claim 19, characterized in that, 0.75≤L1 / L≤0.

9.

21. The energy storage device as described in claim 19, characterized in that, 3m≤L≤9m.

22. The energy storage device as described in claim 21, characterized in that, 5m≤L≤7m.

23. The energy storage device as described in claim 1, characterized in that, The battery compartment contains a plurality of battery cells arranged along the width of the housing; Along the width direction, the size of the battery compartment is D1, and the sum of the sizes of the outer shells of the multiple battery cells arranged in the battery compartment is D2, satisfying: 0.6≤D2 / D1≤0.

95.

24. The energy storage device as described in claim 23, characterized in that, 0.75≤D2 / D1≤0.

9.

25. The energy storage device as described in claim 23, characterized in that, Along the width direction, the size of the outer shell of each battery cell is D3, and N3 battery cells are arranged in the battery compartment, satisfying: D2 = D3 * N3.

26. The energy storage device as described in claim 25, characterized in that, 0.02≤D3 / D1≤0.

05.

27. The energy storage device as described in claim 26, characterized in that, 0.032≤D3 / D1≤0.

04.

28. The energy storage device as described in claim 25, characterized in that, 0.04m≤D3≤0.12m.

29. The energy storage device as described in claim 28, characterized in that, 0.06m≤D3≤0.08m.

30. The energy storage device as described in claim 23, characterized in that, Along the width direction, the dimension of the box is D, which satisfies: 0.65≤D1 / D≤0.

99.

31. The energy storage device as described in claim 30, characterized in that, 0.75≤D1 / D≤0.

92.

32. The energy storage device as described in claim 30, characterized in that, 1.5m≤D≤3.5m.

33. The energy storage device as described in claim 32, characterized in that, 2m≤D≤3m.

34. The energy storage device as claimed in claim 1, characterized in that, The battery compartment contains multiple battery cells arranged along the height of the housing. Along the height direction, the size of the battery compartment is H1, and the sum of the sizes of the outer shells of the multiple battery cells arranged in the battery compartment is H2, satisfying: 0.6≤H2 / H1≤0.

95.

35. The energy storage device as described in claim 34, characterized in that, 0.7≤H2 / H1≤0.

9.

36. The energy storage device as described in claim 34, characterized in that, Along the height direction, the size of the outer shell of each battery cell is H3, and N4 battery cells are arranged in the battery compartment, satisfying: H2 = H3 * N4.

37. The energy storage device as described in claim 36, characterized in that, 0.07≤H3 / H1≤0.

12.

38. The energy storage device as described in claim 37, characterized in that, 0.08≤H3 / H1≤0.

1.

39. The energy storage device as described in claim 36, characterized in that, 0.17m≤H3≤0.6m.

40. The energy storage device as described in claim 39, characterized in that, 0.2m≤H3≤0.45m.

41. The energy storage device as described in claim 34, characterized in that, Along the height direction, the dimension of the box is H, which satisfies: 0.55≤H1 / H≤0.

85.

42. The energy storage device as claimed in claim 41, characterized in that, 0.65≤H1 / H≤0.

78.

43. The energy storage device as described in claim 41, characterized in that, 1.5m≤H≤3.5m.

44. The energy storage device as described in claim 43, characterized in that, 2m≤H≤3m.

45. The energy storage device as claimed in claim 1, characterized in that, The battery compartment contains a plurality of batteries arranged along the length of the housing. Along the length direction, the size of the battery compartment is L1, and the sum of the sizes of the multiple batteries arranged in the battery compartment is L4, satisfying: 0.7≤L4 / L1≤0.

96.

46. ​​The energy storage device as described in claim 45, characterized in that, 0.78≤L4 / L1≤0.

91.

47. The energy storage device as described in claim 45, characterized in that, Along the length direction, the size of each battery is L5, and N5 batteries are arranged in the battery compartment, satisfying: L4 = L5 * N5.

48. The energy storage device as described in claim 47, characterized in that, 1m≤L5≤1.5m, 2≤N5≤6.

49. The energy storage device as claimed in claim 1, characterized in that, The battery compartment contains a plurality of batteries arranged along the width of the housing; Along the width direction, the size of the battery compartment is D1, and the sum of the sizes of the multiple batteries arranged in the battery compartment is D4, satisfying: 0.7≤D4 / D1≤0.

96.

50. The energy storage device as described in claim 49, characterized in that, 0.78≤D4 / D1≤0.

91.

51. The energy storage device as described in claim 49, characterized in that, Along the width direction, the size of each battery is D5, and N6 batteries are arranged in the battery compartment, satisfying: D4 = D5 * N6.

52. The energy storage device as described in claim 51, characterized in that, 1m≤D5≤1.5m, 2≤N6≤3.

53. The energy storage device as described in claim 1, characterized in that, Along the width direction of the housing, the battery compartment can hold only one battery. The size of the battery compartment is D1, and the size of the battery is D5, satisfying: 0.8≤D5 / D1≤0.

99.

54. The energy storage device as described in claim 53, characterized in that, 0.85≤D5 / D1≤0.

93.

55. The energy storage device as described in claim 53, characterized in that, 1.5m≤D5≤2.5m.

56. The energy storage device as described in claim 55, characterized in that, 1.7m≤D5≤2.3m.

57. The energy storage device as claimed in claim 1, characterized in that, The battery compartment contains a plurality of batteries arranged along the height of the housing. Along the height direction, the size of the battery compartment is H1, and the sum of the sizes of the multiple batteries arranged in the battery compartment is H4, satisfying: 0.6≤H4 / H1≤0.

99.

58. The energy storage device as described in claim 57, characterized in that, 0.7≤H4 / H1≤0.

92.

59. The energy storage device as described in claim 57, characterized in that, Along the height direction, the size of each battery is H5, and N7 batteries are arranged in the battery compartment, satisfying: H4 = H5 * N7.

60. The energy storage device as described in claim 59, characterized in that, 0.2m≤H5≤0.3m, 2≤N7≤10.

61. The energy storage device as claimed in claim 1, characterized in that, Along the height direction of the housing, the battery compartment can hold only one battery. The size of the battery compartment is H1, and the size of the battery is H5, satisfying: 0.8≤H5 / H1≤0.

99.

62. The energy storage device as described in claim 61, characterized in that, 0.85≤H5 / H1≤0.

93.

63. The energy storage device as described in claim 61, characterized in that, 1.5m≤H5≤2.5m.

64. The energy storage device as described in claim 63, characterized in that, 1.7m≤H5≤2.3m.

65. The energy storage device as claimed in claim 1, characterized in that, The volume of the sub-compartment is V4, and the sum of the volumes of the batteries within the sub-compartment is V5, which satisfies the condition; 0.75≤V5 / V4≤0.

95.

66. The energy storage device as described in claim 65, characterized in that, 0.82≤V5 / V4≤0.

9.

67. The energy storage device as claimed in claim 1, characterized in that, Along the length of the housing, each sub-compartment holds only one battery.

68. The energy storage device as claimed in claim 67, characterized in that, Along the length direction, the size of the sub-compartment is L6, and the size of the battery is L5, satisfying: 0.85≤L5 / L6≤0.

99.

69. The energy storage device as described in claim 68, characterized in that, 0.88≤L5 / L6≤0.

95.

70. The energy storage device as claimed in claim 1, characterized in that, Along the width of the housing, each sub-compartment holds only one battery.

71. The energy storage device of claim 1, wherein, Along the height direction of the housing, the sub-compartment contains a plurality of the batteries.

72. The energy storage device of claim 1, wherein, The number of sub-compartments is less than or equal to 4.

73. The energy storage device of claim 1, wherein, The volume of the battery is V6, and the sum of the volumes of the casings of the multiple battery cells is V7, satisfying: 0.5≤V7 / V6≤0.

8.

74. The energy storage device of claim 73, wherein the electrolyte is a non-aqueous electrolyte. 0.58≤V7 / V6≤0.

7.

75. The energy storage device of claim 73, wherein the carbon nanotube is a single- walled carbon nanotube. The battery has N8 battery cells, and the volume of the casing of each battery cell is V3, satisfying: V7 = V3 * N8.

76. The energy storage device of claim 1, wherein, In each row of battery cells, the sum of the dimensions of the casings of q battery cells along the length direction is L7, and the dimension of the battery along the length direction is L5, satisfying: 0.8≤L7 / L5≤0.

95.

77. The energy storage device of claim 76, wherein, 0.85≤L7 / L5≤0.

9.

78. The energy storage device of claim 76, wherein the electrolyte is a non-aqueous electrolyte. Along the length direction, the size of the outer casing of each battery cell is L3, satisfying: L3=L7 / q, 0.17m≤L3≤0.6m, 1≤q≤5.

79. The energy storage device of claim 78, wherein, q = 4, 0.2m ≤ L3 ≤ 0.3m.

80. The energy storage device as described in claim 78, characterized in that, q = 2, 0.4m ≤ L3 ≤ 0.6m.

81. The energy storage device of claim 1, wherein, In each column of battery cells, the sum of the dimensions of the outer casings of the p battery cells along the width direction is D7, and the dimension of the battery along the width direction is D5, satisfying: 0.75≤D7 / D5≤0.

95.

82. The energy storage device of claim 81, wherein, 0.82≤D7 / D5≤0.

9.

83. The energy storage device of claim 81, wherein the carbon nanotube is a single- walled carbon nanotube. Along the width direction, the size of the outer casing of each battery cell is D3, satisfying: D3=D7 / p, 0.04m≤D3≤0.12m, 20≤p≤30.

84. The energy storage device as described in claim 83, characterized in that, 0.06m≤D3≤0.08m, 24≤p≤28.

85. The energy storage device of claim 1, wherein, The outer casing of the battery cell has a dimension H3 along the height direction of the housing, and the battery has a dimension H5 along the height direction, satisfying: 0.75≤H3 / H5≤0.

95.

86. The energy storage device as described in claim 85, characterized in that, 0.82≤H3 / H5≤0.

9.

87. The energy storage device of claim 85, wherein the carbon nanotube is a single- walled carbon nanotube. 0.17m≤H3≤0.6m.

88. The energy storage device of claim 87, wherein, 0.2m≤H3≤0.45m.

89. The energy storage device of any one of claims 1-88, wherein, The battery cell further includes at least one electrode assembly, which is housed within the housing; The outer shell is in the shape of a right parallelepiped. The dimension of the outer shell in the first direction is W1, the dimension of the outer shell in the second direction is T1, and the dimension of the outer shell in the third direction is K1. One of the first direction, the second direction, and the third direction is parallel to the length direction of the box, another is parallel to the width direction of the box, and the third direction is parallel to the height direction of the box. The outer shell includes a first wall and a second wall disposed opposite to each other along the first direction, a third wall and a fourth wall disposed opposite to each other along the second direction, and a fifth wall and a sixth wall disposed opposite to each other along the third direction. The sum of the thicknesses of the first wall and the second wall is a, the sum of the thicknesses of the third wall and the fourth wall is b, and the sum of the thicknesses of the fifth wall and the sixth wall is c, satisfying: (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≥0.

9.

90. The energy storage device of claim 89, wherein, (W1-a) / W1≥0.97, (T1-b) / T1≥0.965, and (K1-c) / K1≥0.

965.

91. The energy storage device of claim 89, wherein the electrolyte comprises a lithium salt. The housing includes a shell and an end cap, the shell having an opening, the end cap covering the opening, and the end cap being provided with the electrode terminals; The housing includes an integrally formed first wall, second wall, third wall, fourth wall and fifth wall, and the end cap is the sixth wall.

92. The energy storage device as described in claim 91, characterized in that, The battery cell further includes a first insulating member and a second insulating member. The first insulating member is disposed between the fifth wall and the electrode assembly and abuts against the fifth wall. The second insulating member is disposed between the sixth wall and the electrode assembly and abuts against the sixth wall. The maximum dimension of the first insulating member in the third direction is e1, and the maximum dimension of the second insulating member in the third direction is e2, satisfying: (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e1-e2) / (W1*T1*K1)≥0.88, 0.3mm≤e1≤1.2mm, and 2mm≤e2≤10mm.

93. The energy storage device of either of claims 91 or 92, wherein, The battery cell further includes a first insulating member and a second insulating member. The first insulating member is disposed between the fifth wall and the electrode assembly and abuts against the fifth wall. The second insulating member is disposed between the sixth wall and the electrode assembly and abuts against the sixth wall. The maximum dimension of the first insulating member in the third direction is e1, and the maximum dimension of the second insulating member in the third direction is e2, satisfying: (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1)≥0.85, 0.3mm≤e1≤1.2mm, and 2mm≤e2≤10mm.

94. The energy storage device of either claim 91 or 92, wherein, W1≥T1, the first direction is parallel to the length direction of the box, the second direction is parallel to the width direction of the box, and the third direction is parallel to the height direction of the box.

95. The energy storage device of claim 89, wherein the electrolyte comprises a lithium salt. The housing includes a housing and two end caps. The housing has two openings that are opposite to each other along the third direction. The two end caps respectively cover the two openings. At least one end cap is provided with the electrode terminal. The housing includes an integrally formed first wall, second wall, third wall and fourth wall, and the two end caps are the fifth wall and the sixth wall, respectively.

96. The energy storage device of claim 95, wherein, The battery cell further includes a third insulating member and a fourth insulating member. The third insulating member is disposed between the fifth wall and the electrode assembly and abuts against the fifth wall. The fourth insulating member is disposed between the sixth wall and the electrode assembly and abuts against the sixth wall. The maximum dimension of the third insulating member in the third direction is e3, and the maximum dimension of the fourth insulating member in the third direction is e4, satisfying: (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e3-e4) / (W1*T1*K1)≥0.88, 2mm≤e3≤10mm, and 2mm≤e4≤10mm.

97. The energy storage device as described in claim 95 or 96, characterized in that, The battery cell further includes a third insulating member and a fourth insulating member. The third insulating member is disposed between the fifth wall and the electrode assembly and abuts against the fifth wall. The fourth insulating member is disposed between the sixth wall and the electrode assembly and abuts against the sixth wall. The maximum dimension of the third insulating member in the third direction is e3, and the maximum dimension of the fourth insulating member in the third direction is e4, satisfying: (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1)≥0.85, 2mm≤e3≤10mm, and 2mm≤e4≤10mm.

98. The energy storage device as described in claim 95 or 96, characterized in that, W1≥T1, the first direction is parallel to the height direction of the box, the second direction is parallel to the width direction of the box, and the third direction is parallel to the length direction of the box.

99. The energy storage device as described in claim 89, characterized in that, The positive electrode material of the battery cell includes lithium phosphate, and the capacity of the battery cell is C, which satisfies: C≥350Ah, C / ((W1-a)*(T1-b)*(K1-c))≥118Ah / L.

100. The energy storage device as described in claim 89, characterized in that, The positive electrode material of the battery cell includes lithium transition metal oxide, and the capacity of the battery cell is C, which satisfies: C≥650Ah, C / ((W1-a)*(T1-b)*(K1-c))≥190Ah / L.

101. The energy storage device as described in claim 89, characterized in that, The battery cell is a sodium-ion battery cell, and the capacity of the battery cell is C, which satisfies: C≥260Ah, C / ((W1-a)*(T1-b)*(K1-c))≥87Ah / L.

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