Energy Storage Device

Abstract

An embodiment of the present application provides an energy storage device, which belongs to the energy storage technical field. The energy storage device includes a housing and a plurality of battery cells. The housing has a battery chamber. The plurality of battery cells are accommodated in the battery chamber. The battery cells include a housing and electrode terminals, and the electrode terminals are installed in the housing. Here, the volume of the battery chamber is V1, and the sum of the volumes of the housings of all the battery cells in the battery chamber is V2, where 0.4≦V2 / V1≦0.95. By relatively increasing the volume occupancy rate of all the battery cells in the battery chamber, it is advantageous to improve the space utilization rate of the battery chamber and improve the volumetric energy density of the energy storage device.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority to international application PCT / CN2023 / 101944, entitled "Energy Storage Device," filed June 21, 2023, the entire contents of which are incorporated herein by reference.

[0002] TECHNICAL FIELD This application relates to the field of energy storage technology, and in particular to energy storage devices. [Background technology]

[0003] An energy storage device is an electrical energy storage and transfer device, and may be used in a power system to store surplus electrical energy during periods of low power consumption and supplement power consumption during periods of peak power consumption. Thus, the energy storage device can store excess power generated by the power generation system and also transfer electrical energy to the power grid when the power generation amount of the power generation system is low.

[0004] An energy storage device generally includes a housing and a plurality of battery cells disposed inside the housing, the plurality of battery cells being connected in series, parallel, or series-parallel to store electrical energy. Currently, the volumetric energy density of energy storage devices is relatively low. Therefore, how to improve the volumetric energy density of energy storage devices is a problem that needs to be solved. Summary of the Invention

[0005] The embodiments of the present application provide an energy storage device that can effectively improve the volumetric energy density of the energy storage device.

[0006] An embodiment of the present application provides an energy storage device, the energy storage device including a housing and a plurality of battery cells, the housing having a battery chamber, the plurality of battery cells being accommodated in the battery chamber, the battery cells including housings and electrode terminals, the electrode terminals being installed in the housing, wherein a volume of the battery chamber is V1, a sum of the volumes of the housings of all the battery cells in the battery chamber is V2, and 0.4≦V2 / V1≦0.95.

[0007] In the above technical solution, V2 / V1≦0.95, which prevents the volumetric occupancy of all battery cells in the battery chamber from becoming too large, reduces the assembly precision requirements for the energy storage device, and effectively controls the manufacturing cost of the energy storage device within a reasonable range. V2 / V1≧0.4, which ensures that the volumetric occupancy of all battery cells in the battery chamber is relatively large, thereby improving the space utilization rate of the battery chamber and favoring the improvement of the volumetric energy density of the energy storage device.

[0008] In some embodiments, 0.5≦V2 / V1≦0.85, which is advantageous for balancing the requirements for volumetric energy density and economy of the energy storage device, further reducing the manufacturing cost of the energy storage device, and improving the volumetric energy density of the energy storage device.

[0009] In some embodiments, 0.52≦V2 / V1≦0.75. The manufacturing cost of the energy storage device can be controlled to a relatively low level, and the volumetric energy density of the energy storage device can also be controlled to a relatively high level.

[0010] In some embodiments, the volume of the case of each battery cell is V3, and the number of battery cells in the battery compartment is N1, satisfying V2 = V3 * N1. In this way, the housing volumes of all battery cells in the battery compartment may be made equal and battery cells with the same specifications may be selected. This is advantageous for improving the assembly efficiency of the energy storage device and reducing the possibility of wasting space due to battery cells with different specifications in the battery compartment.

[0011] In some embodiments, 0.0001≦V3 / V1≦0.00025. When V3 / V1≧0.0001, the volumetric occupancy of the battery cell housing within the battery chamber is relatively large, which allows the number of battery cells to be reduced for a given volume of the battery chamber, reducing the possibility of reducing available space due to an excessive number of battery cells, which is beneficial to improving the volumetric energy density of the energy storage device. When V3 / V1≦0.00025, the volumetric occupancy of the battery cell housing within the battery chamber is not too large, which reduces the difficulty and cost of manufacturing the battery cells.

[0012] In some embodiments, 0.00015≦V3 / V1≦0.0002, which simultaneously satisfies the requirements for the volumetric energy density of the energy storage device, the ease of manufacturing the battery cell, and the cost-effectiveness of the battery cell, and is advantageous for improving the volumetric energy density of the energy storage device and reducing the ease and cost of manufacturing the battery cell.

[0013] In some embodiments, 0.0026 m 3 ≦V3≦0.008m 3 This is advantageous for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of the battery cell.

[0014] In some embodiments, 0.004 m 3 ≦V3≦0.006m 3 The volumetric energy density of the energy storage device can be controlled to a relatively high level, and the manufacturing cost of the battery cell can also be controlled to a relatively low level.

[0015] In some embodiments, the volume of the housing is V, and satisfies 0.45≦V1 / V≦0.75. When V1 / V≧0.45, the ratio of the volume of the battery compartment to the volume of the housing is relatively large, increasing the available effective space within the housing and favoring an improvement in the volumetric energy density of the energy storage device. When V1 / V≦0.75, the volume of the battery compartment is not too large, ensuring more installation space for other components in the energy storage device and reducing the difficulty of installing other components.

[0016] In some embodiments, 0.55≦V1 / V≦0.65. It is possible to balance the requirements for volumetric energy density of the energy storage device with ease of installation of other components of the energy storage device.

[0017] In some embodiments, 20 m 3 ≦V≦80m 3 V≧20m 3 This makes the volume of the enclosure relatively large, which is advantageous for realizing the large energy requirements of the energy storage device and storing more electrical energy. V≦80m 3 This prevents the volume of the housing from becoming too large, making it easier to carry and transport the energy storage device.

[0018] In some embodiments, 35 m 3 ≦V≦50m 3 Furthermore, the requirements for large energy of the energy storage device and convenience of transporting and transporting the energy storage device can be met at the same time.

[0019] In some embodiments, the battery chamber accommodates a plurality of battery cells arranged along the longitudinal direction of the housing. The size of the battery chamber along the longitudinal direction of the housing is L1, and the sum of the sizes of the housings of the battery cells arranged in the battery chamber is L2, satisfying 0.6≦L2 / L1≦0.95. When L2 / L1≧0.6, the proportion of the size of the housings of the battery cells arranged along the longitudinal direction of the housing within the battery chamber along the longitudinal direction of the housing is relatively large, making full use of the space in the battery chamber along the longitudinal direction of the housing and reducing the gap between the housings of adjacent battery cells in the longitudinal direction of the housing, which is advantageous for improving the volumetric occupancy rate of all battery cell housings in the battery chamber and improving the volumetric energy density of the energy storage device. When L2 / L1≦0.95, sufficient installation space is ensured in the battery chamber along the longitudinal direction of the housing for installing the battery cells, reducing the difficulty of installing the battery cells.

[0020] In some embodiments, 0.75≦L2 / L1≦0.9. In this way, the requirements for the volumetric energy density of the energy storage device and ease of installation in the longitudinal direction of the battery cell housing are both satisfied, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the longitudinal direction of the battery cell housing.

[0021] In some embodiments, the size of each battery cell housing along the longitudinal direction of the housing is L3, and N2 battery cells are arranged in the battery chamber, satisfying L2 = L3 * N2. In this way, the sizes of the housings of the multiple battery cells along the longitudinal direction of the housing can be made equal, effectively reducing the possibility of wasting space due to different sizes of the battery cell housings along the longitudinal direction of the housing. During assembly, multiple battery cells with the same specifications can be selected and arranged along the longitudinal direction of the housing, improving the assembly efficiency of the energy storage device and reducing the manufacturing cost of the energy storage device.

[0022] In some embodiments, 0.03≦L3 / L1≦0.12. When L3 / L1≧0.03, the proportion of the battery cell housing's length within the battery chamber along the longitudinal direction of the housing is relatively large, which reduces the number of battery cells accommodated within the battery chamber along the longitudinal direction of the housing for a given battery chamber length. This reduces the possibility of reducing available space due to an excessive number of battery cells, which is beneficial to improving the volumetric energy density of the energy storage device. When L3 / L1≦0.12, the proportion of the battery cell housing's length within the battery chamber along the longitudinal direction of the housing is not too large, which effectively reduces the difficulty and cost of manufacturing the battery cells.

[0023] In some embodiments, 0.055≦L3 / L1≦0.09, which is advantageous for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of the battery cell.

[0024] In some embodiments, 0.17m≦L3≦0.6m. When L3≧0.17m, the size of the battery cell housing along the longitudinal direction of the casing can be relatively large, which is advantageous for increasing the proportion of the size of the battery cell housing along the longitudinal direction of the casing within the battery chamber of the battery cell housing, and is advantageous for improving the volumetric energy density of the energy storage device. When L3≦0.6m, the size of the battery cell housing along the longitudinal direction of the casing can be prevented from being too large, which can effectively reduce the difficulty and cost of manufacturing the battery cells.

[0025] In some embodiments, 0.2 m≦L3≦0.45 m, which is advantageous for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of the battery cell.

[0026] In some embodiments, the size of the housing along its longitudinal direction is L, and satisfies 0.65≦L1 / L≦0.95. When L1 / L≧0.65, the proportion of the battery compartment in the housing along its longitudinal direction is relatively large, which is advantageous for providing more space for the battery cells and improving the volumetric energy density of the energy storage device. When L1 / L≦0.95, the housing has a sufficient margin in the longitudinal direction that is not occupied by the battery compartment, providing the housing with sufficient structural strength.

[0027] In some embodiments, 0.75≦L1 / L≦0.9, which satisfies the requirements for the volumetric energy density of the energy storage device and the structural strength of the housing, is advantageous for improving the volumetric energy density of the energy storage device and also for further improving the structural strength of the housing.

[0028] In some embodiments, 3m≦L≦9m. When L≧3m, the size of the housing along the longitudinal direction can be relatively large, and the size of the battery compartment along the longitudinal direction of the housing can be increased, which is advantageous for improving the proportion of the size of the battery compartment along the longitudinal direction of the housing and for improving the volumetric energy density of the energy storage device. When L≦9m, the size of the housing along the longitudinal direction is not too large, which makes it easier to carry and transport the energy storage device.

[0029] In some embodiments, 5 m≦L≦7 m. Furthermore, the requirements for the volumetric energy density of the energy storage device and the ease of transporting and transporting the energy storage device can be simultaneously met.

[0030] In some embodiments, the battery chamber accommodates a plurality of battery cells arranged along the width direction of the housing. The size of the battery chamber along the width direction of the housing is D1, and the sum of the sizes of the housings of the plurality of battery cells arranged within the battery chamber is D2, satisfying 0.6≦D2 / D1≦0.95. When D2 / D1≧0.6, the proportion of the size of the housings of the plurality of battery cells arranged along the width direction of the housing within the battery chamber along the width direction of the housing is relatively large, making full use of the space in the battery chamber along the width direction of the housing and reducing the gap between the housings of adjacent two battery cells in the width direction of the housing, which is advantageous for improving the volumetric occupancy rate of all the battery cell housings in the battery chamber and for improving the volumetric energy density of the energy storage device. When D2 / D1≦0.95, sufficient installation space is ensured in the battery chamber along the width direction of the housing to install the plurality of battery cells, reducing the difficulty of installing the battery cells.

[0031] In some embodiments, 0.75≦D2 / D1≦0.9. In this way, the requirements for the volumetric energy density of the energy storage device and ease of installation in the width direction of the battery cell housing are both satisfied, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the width direction of the battery cell housing.

[0032] In some embodiments, the size of each battery cell housing along the width direction of the housing is D3, and N3 battery cells are arranged in the battery chamber, satisfying D2 = D3 * N3. In this way, the sizes of the housings of the multiple battery cells along the width direction of the housing can be made equal, effectively reducing the possibility of wasting space due to different sizes of the battery cell housings along the width direction of the housing. During assembly, multiple battery cells with the same specifications can be selected and arranged along the width direction of the housing, improving the assembly efficiency of the energy storage device and reducing the manufacturing cost of the energy storage device.

[0033] In some embodiments, 0.02≦D3 / D1≦0.05. When D3 / D1≧0.02, the proportion of the battery cell housing's size within the battery chamber along the width direction of the housing is relatively large, which reduces the number of battery cells accommodated within the battery chamber along the width direction of the housing when the battery chamber's size in the width direction of the housing is constant, thereby reducing the possibility of reducing the available effective space due to an excessive number of battery cells, which is advantageous for improving the volumetric energy density of the energy storage device. When D3 / D1≦0.05, the proportion of the battery cell housing's size within the battery chamber along the width direction of the housing is not too large, which effectively reduces the difficulty and cost of manufacturing the battery cells.

[0034] In some embodiments, 0.032≦D3 / D1≦0.04, which is advantageous for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of the battery cell.

[0035] In some embodiments, 0.04 m≦D3≦0.12 m. D3 ≧0.04 m allows the battery cell housing to have a relatively large width, which is beneficial for increasing the proportion of the width of the battery cell housing within the battery chamber, and for improving the volumetric energy density of the energy storage device. D3 ≦0.12 m prevents the battery cell housing from having an excessively large width, which effectively reduces the manufacturing difficulty and cost of the battery cells.

[0036] In some embodiments, 0.06 m≦D3≦0.08 m, which is advantageous for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of the battery cell.

[0037] In some embodiments, the size of the housing along the width direction of the housing is D, and satisfies 0.65≦D1 / D≦0.99. When D1 / D≧0.65, the proportion of the battery compartment in the housing along the width direction of the housing is relatively large, which is advantageous for providing more space for the battery cells and improving the volumetric energy density of the energy storage device. When D1 / D≦0.95, the housing has sufficient width space not occupied by the battery compartment, providing the housing with sufficient structural strength.

[0038] In some embodiments, 0.75≦D1 / D≦0.92, which satisfies the requirements for the volumetric energy density of the energy storage device and the structural strength of the housing, is advantageous for improving the volumetric energy density of the energy storage device and further improving the structural strength of the housing.

[0039] In some embodiments, 1.5m≦D≦3.5m. When D≧1.5m, the size of the housing along the width direction can be relatively large, allowing the size of the battery compartment along the width direction of the housing to be increased, which is advantageous for improving the proportion of the size of the battery compartment along the width direction of the housing and for improving the volumetric energy density of the energy storage device. When L≦D≦3.5m, the size of the housing along the width direction is not too large, making it easier to carry and transport the energy storage device.

[0040] In some embodiments, 2 m≦D≦3 m. Furthermore, the requirements for the volumetric energy density of the energy storage device and the ease of handling and transporting the energy storage device can be simultaneously met.

[0041] In some embodiments, the battery chamber accommodates a plurality of battery cells arranged along the height of the housing. The size of the battery chamber along the height of the housing is H1, and the sum of the sizes of the housings of the battery cells arranged in the battery chamber is H2, satisfying 0.6≦H2 / H1≦0.95. When H2 / H1≧0.6, the proportion of the size of the housings of the battery cells arranged along the height of the housing in the battery chamber along the height of the housing is relatively large, making full use of the space in the battery chamber along the height of the housing and reducing the gap between the housings of adjacent two battery cells in the height of the housing, which is advantageous for improving the volumetric occupancy rate of all the battery cell housings in the battery chamber and for improving the volumetric energy density of the energy storage device. When H2 / H1≦0.95, sufficient installation space is ensured in the battery chamber along the height of the housing to install the battery cells, reducing the difficulty of installing the battery cells.

[0042] In some embodiments, 0.7≦H2 / H1≦0.9. In this way, the requirements for the volumetric energy density of the energy storage device and the ease of mounting the battery cell housing in the height direction are both satisfied, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of mounting the battery cell housing in the height direction.

[0043] In some embodiments, the size of each battery cell housing along the height direction of the housing is H3, and N4 battery cells are arranged in the battery chamber, satisfying H2 = H3 * N4. In this way, the sizes of the housings of the multiple battery cells along the height direction of the housing can be made equal, effectively reducing the possibility of wasting space due to different sizes of the battery cell housings along the height direction of the housing. During assembly, multiple battery cells with the same specifications can be selected and arranged along the height direction of the housing, improving the assembly efficiency of the energy storage device and reducing the manufacturing cost of the energy storage device.

[0044] In some embodiments, 0.07≦H3 / H1≦0.12. When H3 / H1≧0.07, the proportion of the battery cell housing's size along the height direction of the housing within the battery chamber is relatively large, which reduces the number of battery cells accommodated within the battery chamber along the height direction of the housing when the battery chamber's size along the height direction of the housing is constant, thereby reducing the possibility of reducing the available effective space due to an excessive number of battery cells, which is advantageous for improving the volumetric energy density of the energy storage device. When H3 / H1≦0.12, the proportion of the battery cell housing's size along the height direction of the housing within the battery chamber is not too large, which effectively reduces the difficulty and cost of manufacturing the battery cells.

[0045] In some embodiments, 0.08≦H3 / H1≦0.1, which is advantageous for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of the battery cell.

[0046] In some embodiments, 0.17m≦H3≦0.6m. H3≧0.17m allows the battery cell housing to have a relatively large size along the height direction of the housing, which is beneficial for increasing the proportion of the battery cell housing's size along the height direction within the battery chamber, and is beneficial for improving the volumetric energy density of the energy storage device. H3≦0.6m allows the battery cell housing to have a size along the height direction of the housing that is not too large, which effectively reduces the difficulty and cost of manufacturing the battery cells.

[0047] In some embodiments, 0.2 m≦H3≦0.45 m, which is advantageous for further improving the volumetric energy density of the energy storage device and reducing the manufacturing cost of the battery cell.

[0048] In some embodiments, the size of the housing along the height direction of the housing is H, and satisfies 0.55≦H1 / H≦0.85. When H1 / H≧0.55, the proportion of the battery compartment in the housing along the height direction of the housing is relatively large, which is advantageous for providing more space for the battery cells and improving the volumetric energy density of the energy storage device. When H1 / H≦0.85, the housing has sufficient clearance in the height direction that is not occupied by the battery compartment, providing the housing with sufficient structural strength.

[0049] In some embodiments, 0.65≦H1 / H≦0.78, which satisfies the requirements for the volumetric energy density of the energy storage device and the structural strength of the housing, is advantageous for improving the volumetric energy density of the energy storage device and also for further improving the structural strength of the housing.

[0050] In some embodiments, 1.5m≦H≦3.5m. When H≧1.5m, the size of the housing along the height direction can be relatively large, and the size of the battery compartment along the height direction of the housing can be increased, which is advantageous for improving the proportion of the size of the battery compartment along the height direction of the housing and for improving the volumetric energy density of the energy storage device. When H≦3.5m, the size of the housing along the height direction is not too large, which makes it easier to carry and transport the energy storage device.

[0051] In some embodiments, 2 m≦H≦3 m. Furthermore, the requirements for the volumetric energy density of the energy storage device and the ease of transporting and transporting the energy storage device can be simultaneously met.

[0052] In some embodiments, the battery chamber contains at least one battery, the battery including a plurality of battery cells. During assembly, the plurality of battery cells may be assembled into a battery first, and then the battery may be installed in the battery chamber. This increases the volume of the battery made up of the plurality of battery cells, making it easier to install in the battery chamber and improving assembly efficiency.

[0053] In some embodiments, the battery chamber contains a plurality of batteries arranged along the longitudinal direction of the housing, where the size of the battery chamber along the longitudinal direction of the housing is L1, and the sum of the sizes of the plurality of batteries arranged within the battery chamber is L4, where 0.7≦L4 / L1≦0.96 is satisfied. The battery chamber contains a plurality of batteries arranged along the longitudinal direction of the housing, and the size of each battery along the longitudinal direction of the housing is not too large, thereby reducing the difficulty of manufacturing and installing the batteries. The ratio of the size of the plurality of batteries arranged along the longitudinal direction of the housing to the size of the battery chamber along the longitudinal direction of the housing is relatively large, whereby the space of the battery chamber along the longitudinal direction of the housing is fully utilized and the gap between adjacent batteries in the longitudinal direction of the housing is reduced, which is advantageous for improving the volumetric occupancy rate of all batteries in the battery chamber and for improving the volumetric energy density of the energy storage device. L4 / L1≦0.96, ensuring sufficient space in the battery chamber to install multiple batteries in the longitudinal direction of the housing, reducing the difficulty of battery installation.

[0054] In some embodiments, 0.78≦L4 / L1≦0.91. In this way, the requirements for the volumetric energy density of the energy storage device and ease of installation in the longitudinal direction of the battery casing are both satisfied, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the longitudinal direction of the battery casing.

[0055] In some embodiments, the size of each battery along the longitudinal direction of the housing is L5, and N5 batteries are arranged in the battery chamber, satisfying L4 = L5 * N5. In this way, the sizes of the multiple batteries along the longitudinal direction of the housing can be made equal, effectively reducing the possibility of wasting space due to batteries having different sizes along the longitudinal direction of the housing. During assembly, multiple batteries with the same specifications can be selected and arranged along the longitudinal direction of the housing, improving the assembly efficiency of the energy storage device and reducing the manufacturing cost of the energy storage device.

[0056] In some embodiments, 1 m≦L5≦1.5 m and 2≦N5≦6. In this way, the size of each battery along the longitudinal direction of the housing is relatively large, and the number of batteries is not too large, which is advantageous in reducing the space occupied by components other than the battery cells in the battery, and in improving the size ratio along the longitudinal direction of the housing within the battery chamber for the multiple batteries arranged along the longitudinal direction of the housing.

[0057] In some embodiments, the battery compartment accommodates only one battery along the longitudinal direction of the housing, where the size of the battery compartment is L1 and the size of the battery is L5, and 0.8≦L5 / L1≦0.99 is satisfied. The battery compartment accommodates only one battery along the longitudinal direction of the housing, which is advantageous for improving the utilization rate of the space in the battery compartment along the longitudinal direction of the housing. When L5 / L1≧0.8, the proportion of the battery size in the battery compartment along the longitudinal direction of the housing is relatively large, making full use of the space in the battery compartment along the longitudinal direction of the housing, which is advantageous for improving the volumetric occupancy rate of all batteries in the battery compartment and for improving the volumetric energy density of the energy storage device. When L5 / L1≦0.99, sufficient space is provided in the battery compartment along the longitudinal direction of the housing for installing the battery, which reduces the difficulty of installing the battery.

[0058] In some embodiments, 0.85≦L5 / L1≦0.93. In this way, the requirements for the volumetric energy density of the energy storage device and ease of installation in the longitudinal direction of the battery casing can be met at the same time, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the longitudinal direction of the battery casing.

[0059] In some embodiments, 4m≦L5≦8m. When L5≧4m, the size of the battery casing along the longitudinal direction is relatively large, allowing more battery cells to be arranged along the longitudinal direction of the casing in the battery to meet the large energy requirements of the energy storage device. When L5≦8m, the size of the battery casing along the longitudinal direction is not too large, reducing the difficulty of manufacturing and installing the battery.

[0060] In some embodiments, 5.5 m≦L5≦6.8 m. This simultaneously satisfies the requirements for large energy storage devices, economical battery performance, and ease of installation.

[0061] In some embodiments, the battery chamber accommodates multiple batteries arranged along the width of the housing. The size of the battery chamber along the width of the housing is D1, and the sum of the sizes of the multiple batteries arranged within the battery chamber is D4, where 0.7≦D4 / D1≦0.96 is satisfied. The battery chamber accommodates multiple batteries arranged along the width of the housing, ensuring that the size of each battery along the width of the housing is not too large, thereby reducing the difficulty of manufacturing and installing the batteries. When D4 / D1≧0.7, the proportion of the size of the multiple batteries arranged along the width of the housing within the battery chamber along the width of the housing is relatively large, making full use of the space in the battery chamber along the width of the housing and reducing the gap between adjacent batteries in the width of the housing, which is beneficial for improving the volumetric occupancy rate of all batteries in the battery chamber and improving the volumetric energy density of the energy storage device. When D4 / D1≦0.96 is satisfied, sufficient installation space is provided in the battery chamber along the width of the housing for installing multiple batteries, thereby reducing the difficulty of installing the batteries.

[0062] In some embodiments, 0.78≦D4 / D1≦0.91. In this way, the requirements for the volumetric energy density of the energy storage device and ease of installation in the width direction of the battery housing are both satisfied, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the width direction of the battery housing.

[0063] In some embodiments, the size of each battery along the width direction of the housing is D5, and N6 batteries are arranged in the battery chamber, satisfying D4 = D5 * N6. In this way, the sizes of the multiple batteries along the width direction of the housing are made equal, effectively reducing the possibility of wasting space due to batteries of different sizes along the width direction of the housing. During assembly, multiple batteries with the same specifications are selected and arranged along the width direction of the housing, improving the assembly efficiency of the energy storage device and reducing the manufacturing cost of the energy storage device.

[0064] In some embodiments, 1 m≦D5≦1.5 m and 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, which reduces the space occupied by components other than the battery cells in the battery, and is advantageous for improving the size ratio along the width direction of the housing within the battery chamber for multiple batteries arranged along the width direction of the housing.

[0065] In some embodiments, the battery compartment accommodates only one battery along the width direction of the housing, where the size of the battery compartment is D1 and the size of the battery is D5, and 0.8≦D5 / D1≦0.99 is satisfied. The battery compartment accommodates only one battery along the width direction of the housing, which is advantageous for improving the utilization of the space in the battery compartment along the width direction of the housing. When D5 / D1≧0.8, the proportion of the battery size in the battery compartment along the width direction of the housing is relatively large, making full use of the space in the battery compartment along the width direction of the housing, which is advantageous for improving the volumetric occupancy rate of all batteries in the battery compartment and for improving the volumetric energy density of the energy storage device. When D5 / D1≦0.99, sufficient space is secured in the battery compartment along the width direction of the housing to install the battery, reducing the difficulty of battery installation.

[0066] In some embodiments, 0.85≦D5 / D1≦0.93. In this way, the requirements for the volumetric energy density of the energy storage device and ease of installation in the width direction of the battery housing are both satisfied, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the width direction of the battery housing.

[0067] In some embodiments, 1.5m≦D5≦2.5m. When D5≧1.5m, the size of the battery housing along the width direction is relatively large, allowing more battery cells to be arranged along the width direction of the battery housing, thereby meeting the large energy requirements of the energy storage device. When D5≦2.5m, the size of the battery housing along the width direction is not too large, thereby reducing the difficulty of manufacturing and installing the battery.

[0068] In some embodiments, 1.7 m≦D5≦2.3 m, which simultaneously satisfies the requirements for large energy storage devices, the economical efficiency of batteries, and ease of installation.

[0069] In some embodiments, the battery chamber accommodates multiple batteries arranged along the height of the housing. The size of the battery chamber along the height of the housing is H1, and the sum of the sizes of the multiple batteries arranged in the battery chamber is H4, where 0.6≦H4 / H1≦0.99 is satisfied. The battery chamber accommodates multiple batteries arranged along the height of the housing, ensuring that the size of each battery along the height of the housing is not too large, thereby reducing the difficulty of manufacturing and installing the batteries. When H4 / H1≧0.6, the proportion of the size of the multiple batteries arranged along the height of the housing within the battery chamber along the height of the housing is relatively large, making full use of the space in the battery chamber along the height of the housing and reducing the gap between adjacent batteries in the height of the housing, which is beneficial for increasing the volume occupancy rate of all batteries in the battery chamber and improving the volumetric energy density of the energy storage device. When H4 / H1≦0.99 is satisfied, sufficient installation space is provided in the battery chamber along the height of the housing to install multiple batteries, thereby reducing the difficulty of installing the batteries.

[0070] In some embodiments, 0.7≦H4 / H1≦0.92. In this way, the requirements for the volumetric energy density of the energy storage device and the ease of installation in the height direction of the battery housing are both satisfied, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the height direction of the battery housing.

[0071] In some embodiments, the size of each battery along the height of the housing is H5, and N7 batteries are arranged in the battery chamber, satisfying H4 = H5 * N7. In this way, the sizes of the multiple batteries along the height of the housing can be made equal, effectively reducing the possibility of wasting space due to batteries of different sizes along the height of the housing. During assembly, multiple batteries with the same specifications can be selected and arranged along the height of the housing, improving the assembly efficiency of the energy storage device and reducing the manufacturing cost of the energy storage device.

[0072] In some embodiments, 0.2 m≦H5≦0.3 m and 2≦N7≦10. In this way, the size of each battery along the height direction of the housing is relatively large, and the number of batteries is not too large, which reduces the space occupied by components other than the battery cells in the battery, and is advantageous for improving the size ratio along the height direction of the housing within the battery chamber for multiple batteries arranged along the height direction of the housing.

[0073] In some embodiments, the battery compartment accommodates only one battery along the height of the housing, where the size of the battery compartment is H1 and the size of the battery is H5, and 0.8≦H5 / H1≦0.99 is satisfied. The battery compartment accommodates only one battery along the height of the housing, which is advantageous for improving the utilization of the battery compartment's space along the height of the housing. When H5 / H1≧0.8, the proportion of the battery's size along the height of the housing is relatively large, making full use of the battery compartment's space along the height of the housing, which is advantageous for improving the volumetric occupancy of all batteries within the battery compartment and for improving the volumetric energy density of the energy storage device. When H5 / H1≦0.99, sufficient space is provided in the battery compartment along the height of the housing to install the battery, reducing the difficulty of battery installation.

[0074] In some embodiments, 0.85≦H5 / H1≦0.93. In this way, the requirements for the volumetric energy density of the energy storage device and the ease of installation in the height direction of the battery housing are both satisfied, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the height direction of the battery housing.

[0075] In some embodiments, 1.5m≦H5≦2.5m. When H5≧1.5m, the size of the battery housing along the height direction is relatively large, and the size of the battery cell housing along the height direction in the battery is relatively large, so that the large energy requirements of the energy storage device can be met. When H5≦2.5m, the size of the battery housing along the height direction is not too large, so that the difficulty of manufacturing and installing the battery is reduced.

[0076] In some embodiments, 1.7 m≦H5≦2.3 m. The requirements for large energy of the energy storage device, economy of the battery, and ease of installation are simultaneously met.

[0077] In some embodiments, the battery compartment includes multiple sub-compartments arranged along the longitudinal direction of the housing, each housing housing at least one battery. The battery compartment may be divided into multiple sub-compartments, each housing housing a battery, allowing the batteries to be more regularly arranged within the battery compartment and making battery installation easier.

[0078] In some embodiments, the volume of the sub-chamber is V4, and the sum of the volumes of the batteries in the sub-chamber is V5, satisfying 0.75≦V5 / V4≦0.95. When V5 / V4≧0.75, the volumetric occupancy of all the batteries in the sub-chamber is relatively large, which is advantageous for improving the space utilization rate of the sub-chamber and improving the volumetric energy density of the energy storage device. When V5 / V4≦0.95, the volumetric occupancy of all the batteries in the sub-chamber is not too large, which reduces the assembly accuracy requirements for placing the batteries in the sub-chamber and effectively controls the manufacturing cost of the energy storage device within a reasonable range.

[0079] In some embodiments, 0.82≦V5 / V4≦0.9, which is advantageous for balancing the volumetric energy density requirements of the energy storage device with the requirements for economy, further reducing the manufacturing cost of the energy storage device, and improving the volumetric energy density of the energy storage device.

[0080] In some embodiments, along the length of the housing, the sub-chamber may contain only one battery, which may be advantageous to improve the proportion of the battery in the sub-chamber along the length of the housing and to improve the utilization of the space in the sub-chamber along the length of the housing.

[0081] In some embodiments, the size of the sub-chamber along the longitudinal direction of the housing is L6, and the size of the battery is L5, satisfying 0.85≦L5 / L6≦0.99. When L5 / L6≧0.85, the proportion of the battery size in the sub-chamber along the longitudinal direction of the housing is relatively large, making full use of the space in the sub-chamber along the longitudinal direction of the housing, which is advantageous for increasing the volume occupancy rate of all batteries in the sub-chamber and improving the volumetric energy density of the energy storage device. When L5 / L6≦0.99, sufficient space is ensured in the sub-chamber along the longitudinal direction of the housing for installing the battery, reducing the difficulty of installing the battery.

[0082] In some embodiments, 0.88≦L5 / L6≦0.95. In this way, the requirements for the volumetric energy density of the energy storage device and ease of installation in the longitudinal direction of the battery casing can be met at the same time, which is advantageous for improving the volumetric energy density of the energy storage device and further reducing the difficulty of installation in the longitudinal direction of the battery casing.

[0083] In some embodiments, the sub-chamber may accommodate only one battery along the width of the housing, which may be advantageous to improve the proportion of the battery in the sub-chamber along the width of the housing and to improve the utilization of the space in the sub-chamber along the width of the housing.

[0084] In some embodiments, the sub-chambers house multiple batteries along the height of the housing, thereby reducing the size of a single battery along the height of the housing and reducing the difficulty and cost of manufacturing the batteries.

[0085] In some embodiments, the number of sub-chambers is four or less. In this way, the number of partition members separating two adjacent sub-chambers within the battery chamber is relatively small, reducing the space occupied by the partition members within the battery chamber, providing more space for the battery, and improving the space utilization rate of the battery chamber.

[0086] In some embodiments, the volume of the battery is V6, and the sum of the volumes of the housings of the battery cells is V7, satisfying 0.5≦V7 / V6≦0.8. When V7 / V6≧0.5, the volume ratio of all the battery cells in the battery is relatively large, improving the utilization rate of the battery's internal space and improving the volumetric energy density of the battery, which is beneficial for improving the volumetric energy density of the energy storage device. When V7 / V6≦0.8, the volume ratio of all the battery cells in the battery is not too large, providing more space for other battery components and reducing the difficulty of battery assembly and manufacturing costs.

[0087] In some embodiments, 0.58≦V7 / V6≦0.7, which simultaneously satisfies the requirements for battery volumetric energy density, battery economy, and ease of assembly, and is advantageous for further improving the battery volumetric energy density and reducing the difficulty and manufacturing cost of battery assembly.

[0088] In some embodiments, the number of battery cells in the battery is N8, and the volume of the housing for each battery cell is V3, where V7 = V3 * N8. In this way, the housing volumes of all battery cells in the battery may be made equal and battery cells with the same specifications may be selected. This is advantageous for improving the assembly efficiency of the battery, while also reducing the possibility of wasting space due to different specifications of battery cells.

[0089] In some embodiments, the battery includes p*q battery cells, arranged in p rows and q columns, with each row of the battery cells arranged along the length of the housing and each column of the battery cells arranged along the width of the housing, where p and q are positive integers. In this way, all the battery cells of the battery are distributed in a rectangular array, which is advantageous for increasing the space utilization rate of the battery.

[0090] In some embodiments, in each row of battery cells, the sum of the dimensions of the housings of the q battery cells along the longitudinal direction of the battery casing is L7, and the dimension of the battery along the longitudinal direction of the battery casing is L5, satisfying 0.8≦L7 / L5≦0.95. When L7 / L5≧0.8, the proportion of the housings of the battery cells along the longitudinal direction of the battery casing is relatively large, making full use of the space in the longitudinal direction of the battery casing and reducing the gap between the housings of adjacent battery cells in the longitudinal direction of the battery casing, which is beneficial to improving the volumetric occupancy rate of all battery cells in the battery and improving the volumetric energy density of the battery. When L7 / L5≦0.95, the proportion of the housings of the battery cells along the longitudinal direction of the battery casing is not too large, which reduces the difficulty and cost of battery manufacturing.

[0091] In some embodiments, 0.85≦L7 / L5≦0.9, which satisfies the requirements for battery volumetric energy density, battery manufacturing ease, and battery economy. This is advantageous for further improving the battery volumetric energy density and reducing the battery manufacturing ease and manufacturing costs.

[0092] In some embodiments, the size of the housing of each battery cell along the longitudinal direction of the battery housing is L3, where L3 = L7 / q, 0.17 m ≦ L3 ≦ 0.6 m, and 1 ≦ q ≦ 5 are satisfied. When L3 = L7 / q, the size of the housing of the battery cells in each row along the longitudinal direction of the battery housing may be equal, and battery cells of the same specifications may be selected for each row. However, 0.17 m ≦ L3 ≦ 0.6 m and 1 ≦ q ≦ 5 are satisfied. In this way, the size of each battery cell in each row is relatively large, and the number of batteries is not too large. This reduces the space occupied by the walls of the housing along the longitudinal direction of the battery housing, which is beneficial for improving the size ratio of the housing of each row of battery cells along the longitudinal direction of the battery housing, improving the space utilization rate of the battery, and improving the volumetric energy density of the battery.

[0093] In some embodiments, q=4 and 0.2m≦L3≦0.3m. When there are four battery cells in each row of battery cells, the size of the battery cell housing is controlled within the range of 0.2m to 0.3m, so that the battery has a relatively high volumetric energy density.

[0094] In some embodiments, q=2, and 0.4m≦L3≦0.6m. When there are two battery cells in each row of battery cells, the size of the battery cell housing is controlled within the range of 0.4m≦L3≦0.6m, so that the battery has a relatively high volumetric energy density.

[0095] In some embodiments, for each row of battery cells, the sum of the widthwise dimensions of the housings of the p battery cells is D7, and the widthwise dimension of the battery housing is D5, satisfying 0.75≦D7 / D5≦0.95. When D7 / D5≧0.75, the proportion of the widthwise dimension of the housings of the battery cells in each row is relatively large, making full use of the space in the widthwise dimension of the battery housing and reducing the widthwise gap between the housings of adjacent two battery cells, which is beneficial to improving the volumetric occupancy rate of the housings of all battery cells in the battery and improving the volumetric energy density of the battery. When D7 / D5≦0.95, the proportion of the widthwise dimension of the housings of the battery cells in each row is not too large, which reduces the difficulty and cost of battery manufacturing.

[0096] In some embodiments, 0.82≦D7 / D5≦0.9, which satisfies the requirements for battery volumetric energy density, battery manufacturing ease, and battery economy. This is advantageous for further improving the battery volumetric energy density and reducing the battery manufacturing ease and manufacturing costs.

[0097] In some embodiments, the size of the housing of each battery cell along the width direction of the housing is D3, where D3 = D7 / p, 0.04 m ≦ D3 ≦ 0.12 m, and 20 ≦ p ≦ 30 are satisfied. When D3 = D7 / p, the size of the housing of the battery cells in each row along the width direction of the housing may be equal, and battery cells of the same specifications may be selected for each row. However, 0.04 m ≦ D3 ≦ 0.12 m and 20 ≦ p ≦ 30 are satisfied. In this way, the size of each battery cell in each row is relatively large, and the number of batteries is not too large. This reduces the space occupied by the walls of the housing in the width direction of the housing, which is beneficial for improving the size ratio of the housing of each row of battery cells along the width direction of the battery, improving the space utilization rate of the battery, and improving the volumetric energy density of the battery.

[0098] In some embodiments, 0.06 m≦D3≦0.08 m, and 24≦p≦28. Such batteries have relatively high volumetric energy densities.

[0099] In some embodiments, the size of the battery cell housing along the height direction of the battery housing is H3, and the size of the battery housing along the height direction is H5, satisfying 0.75≦H3 / H5≦0.95. When H3 / H5≧0.75, the proportion of the battery cell housing along the height direction of the battery housing is relatively large, making full use of the space in the height direction of the battery housing, which is beneficial for improving the volume occupancy rate of all battery cell housings in the battery and improving the volumetric energy density of the battery. When H3 / H5≦0.95, the proportion of the battery cell housing along the height direction of the battery housing is not too large, which reduces the difficulty and cost of battery manufacturing.

[0100] In some embodiments, 0.82≦H3 / H5≦0.9, which satisfies the requirements for battery volumetric energy density, battery manufacturing ease, and battery economy. This is advantageous for further improving the battery volumetric energy density and reducing the battery manufacturing ease and manufacturing costs.

[0101] In some embodiments, 0.17m≦H3≦0.6m. H3≧0.17m allows the battery cell housing to have a relatively large size along the height direction of the housing, which is beneficial for improving the proportion of the battery cell housing to the battery housing's size along the height direction of the housing, and is beneficial for improving the volumetric energy density of the battery cell. H3≦0.6m prevents the battery cell housing from having an excessively large size along the height direction of the housing, which effectively reduces the difficulty and cost of manufacturing the battery cell.

[0102] In some embodiments, 0.2 m≦H3≦0.45 m. This balances the requirements for battery volumetric energy density, battery manufacturing ease, and battery economy. This is advantageous for further improving the battery volumetric energy density and reducing the battery manufacturing ease and manufacturing costs.

[0103] In some embodiments, the battery cell further includes at least one electrode assembly, the electrode assembly being accommodated in a housing, the housing being cuboid, the size of the housing in a first direction being W1, the size of the housing in a second direction being T1, and the size of the housing in a third direction being K1, one of the first direction, the second direction, and the third direction being parallel to a longitudinal direction of the housing, and the other being parallel to a width direction of the housing; and The other is parallel to the height direction of the housing, and the housing includes a first wall and a second wall disposed opposite each other along a first direction, a third wall and a fourth wall disposed opposite each other along the second direction, and a fifth wall and a sixth wall disposed opposite each other along the third direction, wherein 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, and the ratio of the volume of the internal space of the battery cell housing to the volume of the housing is 0.9 or more, which relatively increases the occupancy rate of the internal space of the housing and increases the space available for the housing to accommodate the electrode assembly, thereby improving the volumetric energy density of the battery cell under the same chemical system.

[0104] In some embodiments, (W1-a) / W1≧0.97, (T1-b) / T1≧0.965, and (K1-c) / K1≧0.965. In this way, the size ratios of the interior space of the housing in the three directions can be improved, and the volumetric energy density of the battery cell can be further improved.

[0105] In some embodiments, the housing includes a case and an end cap, the case has an opening, the end cap has an electrode terminal installed therein, the end cap covers the opening, the case 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 a battery, the electrode terminal may be attached to the end cap first, the electrode assembly may be housed in the case, and the end cap may then be placed over the opening of the case, thereby reducing the difficulty of attaching the electrode assembly to the housing and the difficulty of attaching the electrode terminal to the housing.

[0106] In some embodiments, the battery cell further includes a first insulating member and a second insulating member, the first insulating member being disposed between the fifth wall and the electrode assembly and abutting the fifth wall, the second insulating member being disposed between the sixth wall and the electrode assembly and abutting the sixth wall, the maximum size of the first insulating member in the third direction being e1, the maximum size of the second insulating member in the third direction being e2, and satisfying (W1-a-1.6 mm)*(T1-b-1.6 mm)*(K1-c-e1-e2) / (W1*T1*K1)≧0.88, 0.3 mm≦e1≦1.2 mm, and 2 mm≦e2≦10 mm. In this way, the space left for the electrode assembly inside the housing is increased, allowing for the accommodation of a larger volume of the electrode assembly, thereby further improving the volumetric energy density of the battery cell.

[0107] In some embodiments, the battery cell further includes a first insulating member and a second insulating member, the first insulating member being disposed between the fifth wall and the electrode assembly and abutting the fifth wall, the second insulating member being disposed between the sixth wall and the electrode assembly and abutting the sixth wall, the maximum size of the first insulating member in the third direction being e1, the maximum size of the second insulating member in the third direction being e2, and 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. In this way, the space left for the electrode assembly inside the housing is increased, allowing for the accommodation of a larger volume of the electrode assembly, thereby further improving the volumetric energy density of the battery cell.

[0108] In some embodiments, W1≧T1, the first direction is parallel to the longitudinal 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 only an end cap is installed at one end of the case and W1≧T1, the end cap and the fifth wall of the housing are arranged opposite each other along the height direction of the housing, the first wall and the second wall of the housing are arranged opposite each other along the longitudinal direction of the housing, and the third wall and the fourth wall of the housing are arranged opposite each other along the width direction of the housing, which is advantageous for improving the volume occupancy rate of all the battery cells within the battery chamber.

[0109] In some embodiments, the housing includes a case and two end caps, the case having two openings arranged opposite each other along a third direction, the two end caps respectively covering the two openings, at least one end cap having an electrode terminal, the case including a first wall, a second wall, a third wall, and a fourth wall integrally formed therewith, and the two end caps having a fifth wall and a sixth wall, respectively.

[0110] In some embodiments, the battery cell further includes a third insulating member and a fourth insulating member, the third insulating member being disposed between the fifth wall and the electrode assembly and abutting the fifth wall, the fourth insulating member being disposed between the sixth wall and the electrode assembly and abutting the sixth wall, the third insulating member having a maximum size in the third direction of e3, the fourth insulating member having a maximum size in the third direction of e4, and 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. In this way, the space left for the electrode assembly inside the housing is increased, allowing for the accommodation of a larger volume of the electrode assembly, thereby further improving the volumetric energy density of the battery cell.

[0111] In some embodiments, the battery cell further includes a third insulating member and a fourth insulating member, the third insulating member being disposed between the fifth wall and the electrode assembly and abutting the fifth wall, the fourth insulating member being disposed between the sixth wall and the electrode assembly and abutting the sixth wall, the third insulating member having a maximum size in the third direction of e3, the fourth insulating member having a maximum size in the third direction of e4, and satisfying (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1)≧0.85, 2mm≦e3≦10mm, and 2mm≦e4≦10mm. In this way, the space left for the electrode assembly inside the housing is increased, allowing for the accommodation of a larger volume of the electrode assembly, thereby further improving the volumetric energy density of the battery cell.

[0112] 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 longitudinal direction of the housing. When end caps are installed on both ends of the case and W1≧T1, the two end caps of the housing are arranged along the longitudinal direction of the housing, the first and second walls of the housing are arranged along the height direction of the housing, and the third and fourth walls of the housing are arranged opposite each other along the width direction of the housing, which is advantageous for improving the volume occupancy rate of all the battery cells within the battery chamber.

[0113] In some embodiments, the positive electrode material of the battery cell includes a lithium-containing phosphate, and the capacity of the battery cell is C, where C≧350 Ah and C / (W1-a)*(T1-b)*(K1-c)≧118 Ah / L. When the positive electrode material of the battery cell includes a lithium-containing phosphate and C≧350 Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) to be 118 Ah / L or greater can improve the volume occupancy rate of the internal space of the battery cell housing, which is advantageous for achieving a ratio of the volume of the internal space of the battery cell housing to the volume of the housing of 0.9 or greater.

[0114] In some embodiments, the positive electrode material of the battery cell includes a lithium transition metal oxide, and the capacity of the battery cell is C, where C≧650 Ah and C / ((W1-a)*(T1-b)*(K1-c))≧190 Ah / L. When the positive electrode material of the battery cell includes a lithium transition metal oxide and C≧650 Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) to be 190 Ah / L or greater can improve the volume occupancy rate of the internal space of the battery cell housing, and advantageously achieve a ratio of the volume of the internal space of the battery cell housing to the volume of the housing of 0.9 or greater.

[0115] In some embodiments, the battery cells are sodium-ion battery cells, and the capacity of the battery cells is C, where C≧260 Ah and C / ((W1-a)*(T1-b)*(K1-c))≧87 Ah / L. When the battery cells are sodium-ion battery cells and C≧260 Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) to be 87 Ah / L or greater can improve the volume occupancy rate of the battery cell in the housing's internal space, which is advantageous for achieving a ratio of the volume of the battery cell's internal space to the housing's volume that is 0.9 or greater. [Brief explanation of the drawings]

[0116] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings used in the embodiments. It should be understood that the following drawings only illustrate some embodiments of the present application, and should not be considered as limiting the scope. Those skilled in the art can also derive other related drawings based on these drawings without exerting any creative efforts. [Figure 1] FIG. 1 is a perspective view of an energy storage device according to some embodiments of the present application. [Figure 2] FIG. 2 is a structural schematic diagram of the energy storage device shown in FIG. [Figure 3] 3 is a cross-sectional view of the energy storage device shown in FIG. 2 along the line AA. [Figure 4] FIG. 3 is a structural schematic diagram of the housing shown in FIG. 2. [Figure 5] FIG. 1 is an exploded view of a battery cell according to some embodiments of the present application. [Figure 6] FIG. 2 is an exploded view of a battery cell according to some other embodiments of the present application. [Figure 7] 1 is a structural schematic diagram of an energy storage device according to some embodiments of the present application. [Figure 8] 8 is a cross-sectional view of the energy storage device shown in FIG. 7 . [Figure 9] FIG. 1 is an exploded view of a battery according to some embodiments of the present application. [Figure 10]FIG. 2 is a structural schematic diagram of an energy storage device according to still other embodiments of the present application. [Figure 11] 11 is a cross-sectional view of the energy storage device shown in FIG. 10 . [Figure 12] FIG. 1 is a cross-sectional view of an energy storage device according to some embodiments of the present application. [Figure 13] 10A and 10B are structural diagrams of energy storage devices according to further some embodiments of the present application. [Figure 14] FIG. 14 is a structural schematic diagram of the housing shown in FIG. [Figure 15] FIG. 14 is a cross-sectional view of the energy storage device shown in FIG. [Figure 16] 1 is a structural schematic diagram of a battery according to some embodiments of the present application. [Figure 17] 17 is an E-E cross-sectional view of the battery shown in FIG. 16. [Figure 18] FIG. 1 is a perspective view of a battery cell according to some embodiments of the present application. [Figure 19] FIG. 19 is an exploded view of the battery cell shown in FIG. [Figure 20] FIG. 19 is an exploded cross-sectional view of the battery cell shown in FIG. 18 taken along a UW plane. [Figure 21] FIG. 20 is an exploded cross-sectional view of the battery cell shown in FIG. 18 taken along a VW plane. [Figure 22] FIG. 2 is a perspective view of a battery cell according to some further embodiments of the present application. [Figure 23] FIG. 23 is an exploded view of the battery cell shown in FIG. 22. [Figure 24] 23 is an exploded cross-sectional view of the battery cell shown in FIG. 22 cut along a UW plane. [Figure 25] 23 is an exploded cross-sectional view of the battery cell shown in FIG. 22 taken along a VW plane. DETAILED DESCRIPTION OF THE INVENTION

[0117] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the following will clearly describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative efforts fall within the scope of protection of the present application.

[0118] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art of this application, and the terms used in the specification of this application are only for describing specific embodiments and are not intended to limit this application, and the terms "comprises," "has," and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover a non-exclusive "comprise." The terms "first," "second," etc. in the specification and claims of this application or the above-mentioned drawings are not intended to describe a specific order or a hierarchical relationship, but are intended to distinguish different objects.

[0119] An "embodiment" referred to in this application means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of this phrase in various places in the specification do not necessarily all refer to the same embodiment, nor are they mutually exclusive, separate, or alternative embodiments of other embodiments.

[0120] In the description of the present application, it should be explained that unless otherwise clearly defined or limited, the terms "attached," "connected," "joined," and "attached" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, or an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meanings of the above terms in the present application according to specific circumstances.

[0121] The term "and / or" in this application merely describes the relationship between related objects and indicates that three relationships may exist, for example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. Also, the character " / " in this application generally indicates that the related objects before and after are in an "or" relationship.

[0122] In the embodiments of the present application, the same reference numerals represent the same elements, and for the sake of brevity, detailed descriptions of the same elements will be omitted in different embodiments. It should be understood that the dimensions such as thickness, length, width, etc. of various elements in the embodiments of the present application shown in the drawings, and the overall dimensions such as thickness, length, width, etc. of the integrated device are for illustrative purposes only and should not be construed as any limitation on the present application.

[0123] The term "plurality" as used herein refers to two or more (including two).

[0124] In the embodiment of the present application, the battery cell may be a secondary battery, which is a battery cell that can be used by activating the active material by charging after discharging.

[0125] 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, and the like.

[0126] A battery cell generally includes an electrode assembly, which includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (e.g., lithium ions) are repeatedly absorbed and released between the positive electrode and the negative electrode. The separator, installed between the positive electrode and the negative electrode, can reduce the risk of short-circuiting between the positive and negative electrodes and allow the active ions to pass through.

[0127] In some embodiments, the positive electrode may be a positive electrode plate, 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.

[0128] For example, the positive electrode current collector has two surfaces that face each other in the thickness direction of the positive electrode current collector, and the positive electrode active material is disposed on either one or both of the two facing surfaces of the positive electrode current collector.

[0129] For example, the positive electrode current collector may be a metal foil sheet or a composite current collector. For example, the metal foil sheet may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The composite current collector may include a polymer base layer and a metal layer. The composite current collector may be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymer substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0130] For example, the positive electrode active material may include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound thereof. However, the present application is not limited to these materials and may also use other conventional materials that can be used as positive electrode active materials in batteries. These positive electrode active materials may be used alone or in combination.

[0131] In some examples, the negative electrode may be a negative electrode plate, and the negative electrode plate may include a negative electrode current collector.

[0132] For example, the negative electrode current collector may be a metal foil sheet, a metal foam, or a composite current collector. For example, the metal foil sheet may be silver-surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector may include a polymer base layer and a metal layer. The composite current collector may be formed by forming a metal material (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, or silver alloy) on a polymer substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0133] For example, the negative electrode plate 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.

[0134] For example, the negative electrode current collector has two surfaces facing each other in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two facing surfaces of the negative electrode current collector.

[0135] For example, the negative electrode active material may be a negative electrode active material for battery cells known in the art. For example, the negative electrode active material may include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicone-based material, a tin-based material, and lithium titanate. The silicone-based material may be selected from at least one of a silicone element, a silicone oxide, a silicone carbon composite, a silicone nitrogen composite, and a silicone alloy. The tin-based material may be selected from at least one of a tin element, a tin oxide, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative electrode active material may also be used. These negative electrode active materials may be used alone or in combination.

[0136] In some examples, the material of the positive electrode current collector may be aluminum and the material of the negative electrode current collector may be copper.

[0137] In some embodiments, the electrode assembly is a wound structure.

[0138] In some embodiments, the electrode assembly is a laminate structure.

[0139] An energy storage device is a device that integrates multiple battery cells in a housing, and the multiple battery cells are connected in series, parallel, or series-parallel to store electrical energy. The energy storage device may be used in a power system to store surplus electrical energy during power consumption valleys and supplement power consumption during power consumption peaks.

[0140] In a typical energy storage device, a plurality of batteries are installed in a housing, and the battery includes a battery box and a plurality of battery cells housed in the battery box. The space utilization rate of all the batteries in the battery chamber of the housing is not high, and / or the space utilization rate of all the battery cells in the battery box is also not high. Thus, the space utilization rate of all the battery cells in the battery chamber of the energy storage device is relatively low, and the volumetric energy density of the energy storage device is relatively low.

[0141] In view of this, the embodiments of the present application provide an energy storage device in which the ratio of the sum of the volumes of the housings of all battery cells in the battery chamber to the volume of the battery chamber is set within the range of 0.4 to 0.95, thereby relatively increasing the volume occupancy rate of the housings of all battery cells in the battery chamber, which is advantageous for improving the space utilization rate of the battery chamber and improving the volumetric energy density of the energy storage device.

[0142] The specific structure of the energy storage device according to the embodiment of the present application will be described in detail in conjunction with the following drawings.

[0143] 1 to 4, FIG. 1 is a perspective view of an energy storage device 10 according to some embodiments of the present application, FIG. 2 is a structural schematic diagram of the energy storage device 10 shown in FIG. 1, FIG. 3 is an AA cross-sectional view of the energy storage device 10 shown in FIG. 2, and FIG. 4 is a structural schematic diagram of a housing 1 shown in FIG. 2. An embodiment of the present application provides an energy storage device 10, which includes a housing 1 and a plurality of battery cells 21, the housing 1 having a battery chamber 11, the plurality of battery cells 21 being accommodated in the battery chamber 11, the battery cells 21 including a housing 211 and electrode terminals 212, the electrode terminals 212 being installed in the housing 211. Here, the volume of the battery chamber 11 is V1, the sum of the volumes of the housings 211 of all the battery cells 21 in the battery chamber 11 is V2, and 0.4≦V2 / V1≦0.95.

[0144] The housing 1 may be a standard part that meets the international standards established by the International Organization for Standardization (ISO), or may be a non-standard part. The housing 1 may be called a container, and the energy storage device 10 may be called an energy storage container. The housing 1 may have various shapes, for example, a cylindrical shape or a prismatic shape. The prismatic shape may be a triangular prism, a square prism, a pentagonal prism, a hexagonal prism, or the like. For example, in FIGS. 1 to 4, the housing 1 is in the shape of a square prism, and specifically, the housing 1 is in the shape of a rectangular parallelepiped.

[0145] The battery chamber 11 is a space inside the housing 1 for accommodating the battery cells 21. The battery chamber 11 may accommodate only the battery cells 21, or may accommodate components other than the battery cells 21, such as fire protection components, thermal management components, and partitioning components. The fire protection components may include piping, detectors, and the like. The thermal management components may be water-cooled plates. The partitioning components may be plates, beams, and the like. After the partitioning components are installed inside the battery chamber 11, the battery chamber 11 may be divided into multiple spaces, and each space is used to accommodate a battery cell 21. The battery chamber 11 may have various shapes, such as a cylindrical shape or a prismatic shape. For example, in FIGS. 1 to 4, the battery chamber 11 is in the shape of a quadrangular prism, and more specifically, the battery chamber 11 is in the shape of a rectangular parallelepiped. In the case where the battery chamber 11 is in the shape of a rectangular parallelepiped, an opening is formed on at least one side of the battery chamber 11 along the width direction Y of the housing, and the battery cells 21 can enter the battery chamber 11 through the opening. A door leaf may be installed corresponding to the opening side of the battery compartment 11, and the door leaf and the housing 1 may be connected by a sliding or rotating mechanism, such as a hinge, to open and close the opening of the battery compartment 11.

[0146] The volume of the battery chamber 11 can be measured by various methods. For a battery chamber 11 having a regular shape, for example, if the battery chamber 11 is rectangular, the length, width, and height of the battery chamber 11 can be measured using a measuring tool, and the volume V1 of the battery chamber 11 can be calculated from the measured length, width, and height of the battery chamber 11. It can be understood that the product of the length, width, and height of the battery chamber 11 is V1, and a measuring ruler can be used as the measuring tool. It should be noted that if each wall of the battery chamber 11 is flat, the length, width, and height of the battery chamber 11 are measured based on each wall. If a wall of the battery chamber 11 has a protrusion or recess, the length, width, and height of the battery chamber 11 are measured based on the flat area of ​​the wall. For a battery chamber 11 having an irregular shape, it is difficult to calculate the volume of the battery chamber 11 by measuring the external dimensions of the battery chamber 11, so a filling method can be used to measure the volume of the battery chamber 11. The specific method is as follows: the battery chamber 11 is filled with plastic pellets, which may be made of PP (polypropylene) or PE (polyethylene), with a particle size of 0.5 mm to 1.5 mm and a density of 0.94 g / cm. 3 ~0.96g / cm 3 and the volume V1 of the battery chamber 11 is obtained by measuring the total volume of the plastic pellets in the battery chamber 11 using a measuring container. Of course, when measuring the total volume of the plastic pellets, the total weight of the plastic pellets in the battery chamber 11 can be measured using a weighing device to calculate the total mass of the plastic pellets in the battery chamber 11, and then the total volume of the plastic pellets can be calculated based on the total volume of the plastic pellets = total mass of the plastic pellets / density of the plastic pellets, thereby obtaining the volume V1 of the battery chamber 11.

[0147] The housing 1 may include only the battery compartment 11, or may include a space for accommodating other components in addition to the battery compartment 11. For example, the housing 1 may further include a thermal management compartment 13 and a main control compartment 15. The thermal management compartment 13 may accommodate a water-cooling unit, which is used to provide a fluid medium to the thermal management components. The main control compartment 15 may accommodate a main control unit, which is used for high-voltage control and communication of the multiple battery cells 21 in the battery compartment 11. Here, the housing 1 has a rectangular parallelepiped shape, and the battery compartment 11 and the main control compartment 15 are arranged along the height direction Z of the housing. The thermal management compartment 13 may be located on one side of the battery compartment 11 along the longitudinal direction X of the housing, and the main control compartment 15 may be located at the bottom of the battery compartment 11 along the height direction Z of the housing. In another embodiment, the housing 1 may further include an electrical compartment, which may be used to house a busbar unit, a power distribution unit, and a control unit. The busbar unit provides busbars for the multiple battery cells 21 and is used to safely connect the multiple battery cells 21 to the DC side of a power conversion system (PCS). The power distribution unit may extract power from the power grid to power the internal control system and auxiliary systems, and the control unit may include a battery cell management unit, a fire control unit, etc. to detect and manage the inside of the energy storage device. The electrical compartment and the thermal management compartment 13 may be generally located on one side of the battery compartment 11 along the longitudinal direction X of the housing, and the electrical compartment and the thermal management compartment 13 are arranged along the width direction Y of the housing.

[0148] For example, the housing 1 may include a framework and a plurality of side panels, and the framework may be formed by connecting a plurality of beams. Two side panels are installed on each side of the framework along the longitudinal direction X of the housing; two side panels are installed on each side of the framework along the height direction Z of the housing; and one side of the framework is installed on one side along the width direction Y of the housing, and the other side is used to attach a door leaf. The framework and the five side panels collectively define the interior space of the housing 1, and by installing a plurality of beams or plates within this space, this space can be divided into a battery compartment 11, a thermal management compartment 13, a main control compartment 15, and an electrical compartment.

[0149] In the embodiment of the present application, the height direction Z of the housing is parallel to the direction of gravity of the housing 1, the height direction Z of the housing, the width direction Y of the housing, and the longitudinal direction X of the housing are perpendicular to each other, and the length of the housing 1 is equal to or greater than the width of the housing 1.

[0150] The plurality of battery cells 21 in the battery chamber 11 may be connected in series, in parallel, or in series-parallel, and a series-parallel connection means that the plurality of battery cells 21 are both connected in series and in parallel. The plurality of battery cells 21 may be directly housed in the battery chamber 11, or the plurality of battery cells 21 may form a battery 2, and one or more batteries 2 may be housed in the battery chamber 11. For example, in the case where the battery chamber 11 houses multiple batteries 2, the plurality of battery cells 21 may be housed in a battery box to form a battery 2, and then multiple batteries 2 may be housed in the battery chamber 11, and the plurality of batteries 2 may be connected in series, in parallel, or in series-parallel.

[0151] The battery cell 21 is the smallest energy storage unit in the energy storage device 10, and the battery cell 21 may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, and the prismatic battery cell includes a rectangular housing battery cell, a blade-shaped battery cell, a polygonal prism battery cell, etc., and the polygonal prism battery cell is, for example, a pentagonal prism battery cell, a hexagonal prism battery cell, etc.

[0152] 5, which is an exploded view of a battery cell 21 according to some embodiments of the present application. The battery cell 21 further includes an electrode assembly 213, the electrode assembly 213 is housed in a housing 211, and an electrode terminal 212 is installed in the housing 211, and the electrode terminal 212 is electrically connected to the electrode assembly 213.

[0153] The housing 211 is a member for accommodating the electrode assembly 213, the electrolyte, etc. The housing 211 may be cylindrical or prismatic. Prismatic shapes include triangular, rectangular, pentagonal, and hexagonal prisms. Prismatic shapes include oblique rectangular prisms and rectangular hexahedrons. Rectangular prisms include rectangular parallelepipeds and cubes. For example, the housing 211 may include a case 2111 and end caps 2112.

[0154] The case 2111 may be a hollow structure with an opening at one end, or may be a hollow structure with openings at both opposing ends. The case 2111 may have various shapes, such as a cylindrical shape, a prismatic shape, etc. The material of the case 2111 may be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.

[0155] The end cap 2112 is a member that seals the opening of the case 2111 and isolates the internal environment of the battery cell 21 from the external environment. The end cap 2112 and the case 2111 collectively define an accommodating space for accommodating the electrode assembly 213, the electrolyte, and other components. The shape of the end cap 2112 may match the shape of the housing 211. For example, the case 2111 may be rectangular and the end cap 2112 may have a rectangular plate-like structure that fits the housing 211. Alternatively, for example, the case 2111 may be cylindrical and the end cap 2112 may have a circular plate-like structure that fits the case 2111. The material of the end cap 2112 may also vary, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The materials of the end cap 2112 and the case 2111 may be the same or different.

[0156] In an embodiment in which an opening is formed at one end of the case 2111, one end cap 2112 may be provided correspondingly. In an embodiment in which openings are formed at opposite ends of the case 2111, two end caps 2112 may be provided correspondingly, with the two end caps 2112 sealing the two openings of the case 2111 respectively, and the two end caps 2112 and the case 2111 jointly defining the storage space.

[0157] The electrode terminal 212 is a member for inputting or outputting electrical energy in the battery cell 21. The electrode terminal 212 is installed on the housing 211 and is used for electrical connection with a tab 2131 of the electrode assembly 213. The electrode terminal 212 may be installed on the case 2111 of the housing 211 or on an end cap 2112 of the housing 211. The electrode terminal 212 and the tab 2131 may be directly connected, for example, by direct welding, or may be indirectly connected via a current collecting part, which may be a metal conductor such as copper, iron, aluminum, steel, or an aluminum alloy.

[0158] For example, as shown in FIG. 5, the case 2111 has a hollow structure with an opening at one end, and the housing 211 has only one end cap 2112, which seals the opening of the case 2111. Two electrode terminals 212 are provided on the end cap 2112, and the electrode terminals 212 partially protrude from the outer surface 2112a of the end cap. A positive tab and a negative tab are formed on the end of the electrode assembly 213 facing the end cap 2112, and the positive tab and negative tab are electrically connected to the two electrode terminals 212, respectively.

[0159] For example, if the housing 211 of the battery cells 21 is rectangular parallelepiped and the battery chamber 11 is also rectangular parallelepiped, the housing 211 has a longitudinal direction, a width direction, and a height direction, the length of the housing 211 is equal to or greater than the width of the housing 211, and the electrode terminal 212 is located at one end in the height direction of the housing 211. After the multiple battery cells 21 are accommodated in the battery chamber 11, one of the longitudinal direction, width direction, and height direction of the housing 211 may be parallel to the longitudinal direction X of the housing, another may be parallel to the width direction Y of the housing, and still another may be parallel to the height direction Z of the housing.

[0160] The volumes of the housings 211 of all the battery cells 21 in the battery compartment 11 may be the same, for example, all the battery cells 21 in the battery compartment 11 are battery cells 21 of the same specifications, that is, all the battery cells 21 have the same length, width, and height, or at least two of the volumes of the housings 211 of all the battery cells 21 in the battery compartment 11 may not be equal, for example, all the battery cells 21 in the battery compartment 11 are composed of battery cells 21 of different specifications. V2 is the sum of the volumes of the housings 211 of all the battery cells 21 in the battery compartment 11, and if the volumes of the housings 211 of all the battery cells 21 are the same, V2 may be obtained by measuring the volume of the housing 211 of one battery cell 21 and multiplying the volume of the housing 211 of this battery cell 21 by the number of battery cells 21 in the battery compartment 11. If the volumes of the housings 211 of at least two battery cells 21 in the battery chamber 11 are not equal, for example, if the housings 211 of all the battery cells 21 in the battery chamber 11 are composed of two housings 211 with different volumes, the volume of the housings 211 of the first type of battery cells 21 can be first measured, and the volume of the housings 211 of the first type of battery cells 21 can be multiplied by the number of the first type of battery cells 21 in the battery chamber 11 to obtain a first total volume, and then the volume of the housings 211 of the second type of battery cells 21 can be measured, and the volume of the housings 211 of the second type of battery cells 21 can be multiplied by the number of the second type of battery cells 21 in the battery chamber 11 to obtain a second total volume, and the sum of the first total volume and the second total volume is V2.

[0161] The volume of the housing 211 of the battery cell 21 can be measured by various methods. For a housing 211 having a regular shape, for example, if the housing 211 is a rectangular parallelepiped, the length, width, and height of the housing 211 can be measured using a measuring tool, and the volume of the housing 211 can be calculated from the length, width, and height of the housing 211 obtained by the measurements. As can be understood, the product of the length, width, and height of the housing 211 is the volume of the housing 211. A caliper can be selected as the measuring tool. For a housing 211 having an irregular shape, it is difficult to calculate the volume of the housing 211 by measuring the outer size of the housing 211, so the volume of the housing 211 can be measured using an immersion method. A specific method is as follows. Liquid is poured into the measuring container, and a volume value X1 corresponding to the liquid level is recorded. The battery cell 21 is gradually immersed in the liquid until the outer surface 2112a of the end cap 2112 is flush with the liquid level. At this time, the electrode terminals 212 on the end cap 2112 are not immersed in the liquid, and a volume value X2 corresponding to the liquid level at this time is recorded. X2-X1 is the volume of the housing 211 of the battery cell 21.

[0162] 6, which is an exploded view of a battery cell 21 according to some other embodiments of the present application. A convex hull 2112b protruding from an outer surface 2112a of the end cap 2112 is formed on the end cap 2112, and the volume of the housing 211 of the battery cell 21 does not include the volume of the convex hull 2112b. For example, if the housing 211 of the battery cell 21 is a rectangular parallelepiped, when measuring the height of the housing 211, the distance between the outer surface of the wall of the housing 211 facing away from the end cap 2112 and the outer surface 2112a of the end cap is the height of the housing 211, and the height of the convex hull 2112b is not included in the height of the housing 211.

[0163] In this embodiment, V2 / V1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0164] In the embodiment of the present application, V2 / V1≦0.95, which prevents the volumetric occupancy of all battery cells 21 within battery chamber 11 from becoming too large, thereby reducing the assembly precision requirements of energy storage device 10 and effectively controlling the manufacturing cost of energy storage device 10 within a reasonable range. V2 / V1≧0.4, which relatively increases the volumetric occupancy of all battery cells 21 within battery chamber 11, is advantageous for improving the space utilization rate of battery chamber 11 and improving the volumetric energy density of energy storage device 10.

[0165] A specific explanation will be given below using specific experimental data.

[0166] In the experiment, a rectangular parallelepiped housing 1 was selected as the housing 1, with the length, width, and height of the housing 1 being 6.058 m, 2.438 m, and 2.896 m, respectively. The battery compartment 11 was rectangular, and the battery cells 21 were rectangular-shaped battery cells. All the battery cells 21 in the battery compartment 11 had the same specifications and belonged to the same chemical system, and the positive electrode material of the battery cells 21 included lithium iron phosphate. Please refer to Table 1 for specific implementation data.

[0167] [Table 1]

[0168] As can be seen from the comparison of Examples 1 to 12 with Comparative Examples 1 and 2 based on Table 1 above, when V2 / V1≧0.4, the volumetric energy density of the energy storage device 10 can be effectively improved.

[0169] In some embodiments, 0.5≦V2 / V1≦0.85.

[0170] In this embodiment, V2 / V1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0171] In this embodiment, 0.5≦V2 / V1≦0.85, which satisfies the requirements for both the volumetric energy density and economy of the energy storage device 10, is advantageous for further reducing the manufacturing cost of the energy storage device 10, and improving the volumetric energy density of the energy storage device 10.

[0172] In some embodiments, 0.52≦V2 / V1≦0.75.

[0173] In this embodiment, V2 / V1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0174] In this embodiment, 0.52≦V2 / V1≦0.75, and the manufacturing cost of the energy storage device 10 can be controlled to a relatively low level, and the volumetric energy density of the energy storage device 10 can also be controlled to a relatively high level.

[0175] In some embodiments, the volume of the case 2111 of each battery cell 21 is V3, the number of battery cells 21 in the battery chamber 11 is N1, and V2=V3*N1 is satisfied.

[0176] For example, the cases 2111 of the battery cells 21 are rectangular parallelepiped-shaped, and the lengths of the cases 2111 of all the battery cells 21 are equal, the widths of the cases 2111 of all the battery cells 21 are equal, the heights of the cases 2111 of all the battery cells 21 are equal, and the volumes of the housings 211 of all the battery cells 21 are equal.

[0177] Here, N1 is a positive integer equal to or greater than 2. For example, 2000≦N1≦5000.

[0178] In this embodiment, V2=V3*N1, and the volumes of the housings 211 of all the battery cells 21 in the battery compartment 11 may be made equal, and battery cells 21 with the same specifications may be selected. This is advantageous for improving the assembly efficiency of the energy storage device 10, and also reduces the possibility of wasting space due to battery cells 21 with different specifications in the battery compartment 11.

[0179] In some embodiments, 0.0001≦V3 / V1≦0.00025.

[0180] V3 / V1 may be any one point value of 0.0001, 0.00012, 0.00015, 0.00017, 0.00019, 0.0002, 0.00021, 0.00023, 0.00025, etc., or a range value between any two values.

[0181] If there are too many battery cells 21 in the battery chamber 11, the space occupied by the housing 211 of the battery cells 21 and the insulating material inside the housing 211 will increase, reducing the effective space of the battery chamber 11. However, in this embodiment, V3 / V1≧0.0001, and the volumetric occupancy rate of the housing 211 of the battery cells 21 within the battery chamber 11 is relatively large, so that when the volume of the battery chamber 11 is constant, the number of battery cells 21 can be reduced, reducing the possibility of a reduction in the available effective space due to an excessive number of battery cells 21, which is advantageous for improving the volumetric energy density of the energy storage device 10. V3 / V1≦0.00025, and the volumetric occupancy rate of the housing 211 of the battery cells 21 within the battery chamber 11 is not too large, reducing the difficulty and cost of manufacturing the battery cells 21.

[0182] In some embodiments, 0.00015≦V3 / V1≦0.0002.

[0183] In this embodiment, V3 / V1 may be any one point value of 0.00015, 0.00016, 0.00017, 0.00018, 0.00019, 0.0002, etc., or a range value between any two values.

[0184] In this embodiment, 0.00015≦V3 / V1≦0.0002, which simultaneously satisfies the requirements for the volumetric energy density of the energy storage device 10, the manufacturing difficulty of the battery cells 21, and the cost-effectiveness of the battery cells 21, and is advantageous for improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing difficulty and cost of the battery cells 21.

[0185] In some embodiments, 0.0026 m 3 ≦V3≦0.008m 3 is.

[0186] In this example, V3 is 0.0026 m 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 , etc., or a range value between any two of these values.

[0187] In this example, 0.0026 m 3 ≦V3≦0.008m 3 The volume of the housing 211 of the battery cells 21 is relatively large, so that the number of battery cells 21 in the battery chamber 11 is not too large, and of course the volume of the housing 211 of the battery cells 21 is not too large, which is advantageous for further improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing cost of the battery cells 21.

[0188] In some embodiments, 0.004 m 3 ≦V3≦0.006m 3 is.

[0189] In this example, V3 is 0.004 m 3 , 0.0041m 3 , 0.0042m 3 , 0.0043m 3 , 0.0044m 3 , 0.0045m 3 , 0.0046m 3 , 0.0047m 3 , 0.0048m3 , 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 value may be any one point value or a range value between any two values.

[0190] In this example, 0.004 m 3 ≦V3≦0.006m 3 Therefore, the volumetric energy density of the energy storage device 10 can be controlled to a relatively high level, and the manufacturing cost of the battery cells 21 can also be controlled to a relatively low level.

[0191] In some embodiments, the volume of the housing 1 is V, which satisfies 0.45≦V1 / V≦0.75.

[0192] V1 / V ​​may be any one point value of 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, etc., or a range value between any two of these values.

[0193] For example, if the housing 1 is a rectangular parallelepiped, the length, width, and height of the housing 1 can be measured using a measuring tool, and the volume of the housing 1 can be calculated from the measured length, width, and height. As can be understood, the product of the length, width, and height of the housing 1 is the volume V of the housing 1. Here, a measuring ruler may be selected as the measuring tool. It should be noted that if the outer surface of each box wall of the housing 1 is flat, the length, width, and height of the housing 1 are measured based on the outer surface of each box wall, and if a protrusion or recess is formed on the outer surface of a box wall of the housing 1, the length, width, and height of the housing 1 are measured based on the flat area of ​​the outer surface of this box wall.

[0194] In this embodiment, V1 / V≧0.45, which makes the ratio of the volume of the battery compartment 11 to the volume of the housing 1 relatively large, increasing the available effective space within the housing 1 and favorably improving the volumetric energy density of the energy storage device 10. V1 / V≦0.75, which prevents the volume of the battery compartment 11 from being too large, allows more installation space for other components in the energy storage device 10 and reduces the difficulty of installing those components. These other components may be a main control unit, a water-cooling unit, etc.

[0195] In some embodiments, 0.55≦V1 / V≦0.65.

[0196] In this embodiment, V1 / V may be any one point value of 0.55, 0.56, 0.57, 0.58, 0.59, 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, etc., or a range value between any two values.

[0197] In this embodiment, 0.55≦V1 / V≦0.65, and it is possible to satisfy both the requirements for the volumetric energy density of the energy storage device 10 and the ease of mounting other members of the energy storage device 10.

[0198] In some embodiments, 20 m 3 ≦V≦80m 3 is.

[0199] In this example, V is 20 m 3 , 25m 3 , 30m 3 , 35m 3 , 40m 3 , 45m 3 , 50m 3 , 55m 3 , 60m 3 , 65m 3 , 70m 3 , 75m 3 , 80m 3 The value may be any one point value or a range value between any two values.

[0200] In this embodiment, V≧20 m 3 This makes the volume of the housing 1 relatively large, which is advantageous for realizing the large energy requirement of the energy storage device 10 and storing more electrical energy. V≦80m 3 This prevents the volume of the housing 1 from becoming too large, making it easier to carry and transport the energy storage device 10.

[0201] In some embodiments, 35 m 3 ≦V≦50m 3 is.

[0202] In this example, V is 35 m 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 value may be any one point value or a range value between any two values.

[0203] In this example, 35 m 3 ≦V≦50m 3 Furthermore, the requirements for the large energy of the energy storage device 10 and the ease of carrying and transporting the energy storage device 10 can be met at the same time.

[0204] 2 , in some embodiments, a plurality of battery cells 21 arranged along the longitudinal direction X of the housing are housed in the battery chamber 11. Along the longitudinal direction X of the housing, the size of the battery chamber 11 is L1, and the sum of the sizes of the housings 211 of the plurality of battery cells 21 arranged in the battery chamber 11 is L2, where 0.6≦L2 / L1≦0.95 is satisfied.

[0205] The size of the battery chamber 11 along the longitudinal direction X of the housing may be the length of the battery chamber 11, and the size of the battery chamber 11 along the longitudinal direction X of the housing may be measured using a selected measuring tool. For example, the longitudinal direction of the housing 211 of the battery cell 21 is parallel to the longitudinal direction X of the housing, and the sum of the sizes of the housings 211 of the multiple battery cells 21 arranged in the battery chamber 11 along the longitudinal direction X of the housing is the sum of the lengths of the housings 211 of the multiple battery cells 21, and the size of the battery cells 21 along the longitudinal direction X of the housing may be measured using a vernier caliper. Among the multiple battery cells 21 arranged along the longitudinal direction X of the housing, two adjacent battery cells 21 may be in direct contact with each other, or an intermediate member, such as a thermal management member or a heat insulating member, may be provided between them.

[0206] It should be noted that in this embodiment, the sizes of the housings 211 of all the battery cells 21 arranged in the battery chamber 11 along the longitudinal direction X of the housing may all be equal, and the sizes of at least two of the battery cells 21 may not be equal.

[0207] In this embodiment, L2 / L1 may be any one of the following point values: 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc., or a range value between any two of these values.

[0208] In this embodiment, L2 / L1≧0.6, which relatively increases the size ratio of the plurality of battery cells 21 arranged along the longitudinal direction X of the housing within the battery chamber 11 of the housing 211, thereby fully utilizing the space in the longitudinal direction X of the housing and reducing the gap between the housings 211 of two adjacent battery cells 21 in the longitudinal direction X of the housing, which is advantageous for improving the volume occupancy rate of the housings 211 of all battery cells 21 in the battery chamber 11 and for improving the volumetric energy density of the energy storage device 10. L2 / L1≦0.95, which ensures sufficient installation space in the battery chamber 11 for installing the plurality of battery cells 21 in the longitudinal direction X of the housing, thereby reducing the difficulty of installing the battery cells 21.

[0209] In some embodiments, 0.75≦L2 / L1≦0.9.

[0210] In this embodiment, L2 / L1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0211] In this embodiment, 0.75≦L2 / L1≦0.9, which satisfies both the requirements for the volumetric energy density of the energy storage device 10 and ease of installation in the longitudinal direction X of the housing of the battery cells 21, is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further reduce the difficulty of installation in the longitudinal direction X of the housing of the battery cells 21.

[0212] In some embodiments, the size of the housing 211 of each battery cell 21 along the longitudinal direction X of the housing is L3, and N2 battery cells 21 are arranged in the battery chamber 11, satisfying L2=L3*N2.

[0213] Here, N2 is a positive integer of 2 or more.

[0214] In this embodiment, L2=L3*N2, and the sizes of the plurality of battery cells 21 along the longitudinal direction X of the housing 211 are made equal, which effectively reduces the possibility of wasting space due to the battery cells 21 having different sizes along the longitudinal direction X of the housing 211. During assembly, a plurality of battery cells 21 with the same specifications are selected and arranged along the longitudinal direction X of the housing, which improves the assembly efficiency of the energy storage device 10 and reduces the manufacturing cost of the energy storage device 10.

[0215] In some embodiments, 0.03≦L3 / L1≦0.12.

[0216] L3 / L1 may be any one 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 value between any two values.

[0217] In this embodiment, L3 / L1≧0.03, which makes the proportion of the size of the battery cells 21 in the housing 211 within the battery chamber 11 along the longitudinal direction X of the casing relatively large, and thus reduces the number of battery cells 21 accommodated within the battery chamber 11 along the longitudinal direction X of the casing when the size of the battery chamber 11 in the longitudinal direction X of the casing is constant, thereby reducing the possibility of reducing the available effective space due to an excessive number of battery cells 21, which is advantageous for improving the volumetric energy density of the energy storage device 10. L3 / L1≦0.12, which makes the proportion of the size of the battery cells 21 in the housing 211 within the battery chamber 11 along the longitudinal direction X of the casing not too large, which effectively reduces the difficulty and cost of manufacturing the battery cells 21.

[0218] In some embodiments, 0.055≦L3 / L1≦0.09.

[0219] In this embodiment, L3 / L1 may be any one point value of 0.055, 0.06, 0.065, 0.07, 0.075, 0.08, 0.085, 0.09, etc., or a range value between any two values.

[0220] In this embodiment, 0.055≦L3 / L1≦0.09, which is advantageous for further improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing cost of the battery cells 21.

[0221] In some embodiments, 0.17 m≦L3≦0.6 m.

[0222] In this embodiment, L3 may be any one of the point values ​​0.17m, 0.2m, 0.25m, 0.3m, 0.35m, 0.4m, 0.45m, 0.5m, 0.55m, 0.6m, etc., or a range value between any two of these values.

[0223] In this embodiment, L3≧0.17 m, which makes the size of the battery cell 21 along the longitudinal direction X of the housing 211 relatively large, and is advantageous for increasing the proportion of the size of the battery cell 21 along the longitudinal direction X of the housing within the battery chamber 11 of the housing 211, and is advantageous for improving the volumetric energy density of the energy storage device 10. L3≦0.6 m, which makes the size of the battery cell 21 along the longitudinal direction X of the housing 211 not too large, and effectively reduces the difficulty and cost of manufacturing the battery cell 21.

[0224] In some embodiments, 0.2 m≦L3≦0.45 m.

[0225] In this embodiment, L3 may be any one of the point values ​​0.2m, 0.23m, 0.25m, 0.28m, 0.3m, 0.33m, 0.35m, 0.38m, 0.4m, 0.43m, 0.45m, etc., or a range value between any two of these values.

[0226] This embodiment is advantageous in further improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing cost of the battery cells 21.

[0227] In some embodiments, the size of the housing 1 along the longitudinal direction X of the housing is L, and satisfies 0.65≦L1 / L≦0.95.

[0228] The size of the housing 1 along the longitudinal direction is the length of the housing 1, and the length of the housing 1 may be measured using a selected measuring device.

[0229] In this embodiment, L1 / L may be any one point value of 0.65, 0.7, 0.75, 0.8, 0.85, 0.95, etc., or a range value between any two values.

[0230] L1 / L≧0.65, which relatively increases the size ratio of the battery chamber 11 to the housing 1 along the longitudinal direction X of the housing, and increases the size of the battery chamber 11 along the longitudinal direction X of the housing, providing more space for the battery cells 21 and favoring an improvement in the volumetric energy density of the energy storage device 10. L1 / L≦0.95, which ensures that the housing 1 has sufficient space in the longitudinal direction not occupied by the battery chamber 11, and provides the housing 1 with sufficient structural strength.

[0231] In some embodiments, 0.75≦L1 / L≦0.9.

[0232] In this embodiment, L1 / L may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0233] In this embodiment, 0.75≦L1 / L≦0.9, which satisfies both the volumetric energy density of the energy storage device 10 and the structural strength requirements of the housing 1, is advantageous for improving the volumetric energy density of the energy storage device 10, and can also further improve the structural strength of the housing 1.

[0234] In some embodiments, 3m≦L≦9m.

[0235] In this embodiment, L may be any one of the point values ​​3m, 3.5m, 4m, 4.5m, 5m, 5.5m, 6m, 6.5m, 7m, 7.5m, 8m, 8.5m, 9m, etc., or a range value between any two of these values.

[0236] In this embodiment, L≧3 m, which makes it possible to relatively increase the size of the housing 1 along the longitudinal direction and increase the size of the battery chamber 11 along the longitudinal direction X of the housing, which is advantageous for improving the proportion of the size of the battery chamber 11 along the longitudinal direction X of the housing 1 and for improving the volumetric energy density of the energy storage device 10. L≦9 m, which makes it possible to prevent the size of the housing 1 along the longitudinal direction from becoming too large, making it easier to carry and transport the energy storage device 10.

[0237] In some embodiments, 5m≦L≦7m.

[0238] L may be any one of the following point values ​​or a range value between any two of 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, etc.

[0239] In this embodiment, 5 m≦L≦7 m, and further, the requirements for the volumetric energy density of the energy storage device 10 and the convenience of carrying and transporting the energy storage device 10 can be satisfied at the same time.

[0240] 3 , in some embodiments, a plurality of battery cells 21 arranged along the width direction Y of the housing are housed within the battery chamber 11. Along the width direction Y of the housing, the size of the battery chamber 11 is D1, and the sum of the sizes of the housings 211 of the plurality of battery cells 21 arranged within the battery chamber 11 is D2, which satisfies 0.6≦D2 / D1≦0.95.

[0241] The size of the battery chamber 11 along the width direction Y of the housing may be the width of the battery chamber 11, and the size of the battery chamber 11 along the width direction Y of the housing may be measured using a selected measuring tool. For example, the width direction of the housing 211 of the battery cell 21 is parallel to the width direction Y of the housing, and the sum of the sizes of the housings 211 of the multiple battery cells 21 arranged in the battery chamber 11 along the width direction Y of the housing is the sum of the widths of the housings 211 of the multiple battery cells 21, and the size of the battery cell 21 along the width direction Y of the housing may be measured using a vernier caliper. Of the multiple battery cells 21 arranged along the width direction Y of the housing, two adjacent battery cells 21 may be in direct contact with each other, or an intermediate member, such as a thermal management member or a heat insulating member, may be provided.

[0242] It should be noted that in this embodiment, the sizes of the housings 211 of all battery cells 21 arranged along the width direction Y of the housing within the battery chamber 11 may all be equal, and the sizes of at least two battery cells 21 may not be equal.

[0243] In this embodiment, D2 / D1 may be any one of the following point values: 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc., or a range value between any two of these values.

[0244] In this embodiment, D2 / D1≧0.6, which relatively increases the size ratio of the plurality of battery cells 21 arranged along the width direction Y of the housing to the battery chamber 11 of the housing 211 in the width direction Y of the housing, fully utilizing the space of the battery chamber 11 in the width direction Y of the housing and reducing the gap in the width direction Y between the housings 211 of two adjacent battery cells 21, which is advantageous for improving the volume occupancy rate of the housings 211 of all battery cells 21 in the battery chamber 11 and for improving the volumetric energy density of the energy storage device 10. D2 / D1≦0.95, which ensures sufficient installation space in the width direction Y of the battery chamber 11 for installing the plurality of battery cells 21, thereby reducing the difficulty of installing the battery cells 21.

[0245] In some embodiments, 0.75≦D2 / D1≦0.9.

[0246] In this embodiment, D2 / D1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0247] In this embodiment, 0.75≦D2 / D1≦0.9, which satisfies both the requirements for volumetric energy density of the energy storage device 10 and ease of installation in the width direction Y of the housing of the battery cell 21, and is advantageous for improving the volumetric energy density of the energy storage device 10 and further reducing the difficulty of installation in the width direction Y of the housing of the battery cell 21.

[0248] In some embodiments, the size of the housing 211 of each battery cell 21 along the width direction Y of the housing is D3, and N3 battery cells 21 are arranged in the battery chamber 11, satisfying D2=D3*N3.

[0249] Here, N3 is a positive integer of 2 or more.

[0250] In this embodiment, D2=D3*N3, and the sizes of the plurality of battery cells 21 along the width direction Y of the housing 211 are made equal, which effectively reduces the possibility of space being wasted due to the battery cells 21 having different sizes along the width direction Y of the housing 211. During assembly, a plurality of battery cells 21 with the same specifications are selected and arranged along the width direction Y of the housing, which improves the assembly efficiency of the energy storage device 10 and reduces the manufacturing cost of the energy storage device 10.

[0251] In some embodiments, 0.02≦D3 / D1≦0.05.

[0252] D3 / D1 may be any one point value such as 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05, etc., or a range value between any two values.

[0253] In this embodiment, D3 / D1≧0.02, which makes the proportion of the size of the battery cell 21 in the housing 211 within the battery chamber 11 along the width direction Y of the housing relatively large, and reduces the number of battery cells 21 accommodated within the battery chamber 11 along the width direction Y of the housing when the size of the battery chamber 11 in the width direction Y of the housing is constant, thereby reducing the possibility of reducing the available effective space due to an excessive number of battery cells 21, which is advantageous for improving the volumetric energy density of the energy storage device 10. D3 / D1≦0.05, which makes the proportion of the size of the battery cell 21 in the housing 211 within the battery chamber 11 along the width direction Y of the housing not too large, effectively reducing the difficulty and cost of manufacturing the battery cells 21.

[0254] In some embodiments, 0.032≦D3 / D1≦0.04.

[0255] D3 / D1 may be any one of the following point values ​​or a range value between any two of the following values: 0.032, 0.033, 0.034, 0.035, 0.036, 0.037, 0.038, 0.039, 0.04, etc.

[0256] In this embodiment, 0.032≦D3 / D1≦0.04, which is advantageous for further improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing cost of the battery cells 21.

[0257] In some embodiments, 0.04 m≦D3≦0.12 m.

[0258] D3 may be any one of the point values ​​0.04m, 0.05m, 0.06m, 0.07m, 0.08m, 0.09m, 0.1m, 0.11m, 0.12m, etc., or a range value between any two of these values.

[0259] In this embodiment, D3≧0.04 m, which makes the size of the battery cell 21 along the width direction Y of the housing 211 relatively large, and is advantageous for increasing the proportion of the size of the battery cell 21 along the width direction Y of the housing within the battery chamber 11 of the housing 211, and is advantageous for improving the volumetric energy density of the energy storage device 10. D3≦0.12 m, which makes the size of the battery cell 21 along the width direction Y of the housing 211 not too large, and effectively reduces the difficulty and cost of manufacturing the battery cell 21.

[0260] In some embodiments, 0.06 m≦D3≦0.08 m.

[0261] In this embodiment, D3 may be any one of the point 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, 0.072m, 0.073m, 0.074m, 0.075m, 0.076m, 0.077m, 0.078m, 0.079m, 0.08m, etc., or a range value between any two of these values.

[0262] In this embodiment, 0.06 m≦D3≦0.08 m, which is advantageous for further improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing cost of the battery cells 21.

[0263] In some embodiments, the size of the housing 1 along the width direction Y of the housing is D, which satisfies 0.65≦D1 / D≦0.99.

[0264] The size along the width direction of the housing 1 is the width of the housing 1, and the width of the housing 1 may be measured using a selected measuring tool.

[0265] In this embodiment, D1 / D may be any one point value of 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, etc., or a range value between any two values.

[0266] In this embodiment, D1 / D≧0.65, which relatively increases the size ratio of the battery chamber 11 to the housing 1 along the width direction Y of the housing, and increasing the size of the battery chamber 11 along the width direction Y of the housing is advantageous for providing more space for the battery cells 21 and improving the volumetric energy density of the energy storage device 10. D1 / D≦0.95, which ensures that the housing 1 has sufficient space in the width direction that is not occupied by the battery chamber 11, and provides the housing 1 with sufficient structural strength.

[0267] In some embodiments, 0.75≦D1 / D≦0.92.

[0268] In this embodiment, D1 / D may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0269] In this embodiment, 0.75≦D1 / D≦0.92, which satisfies both the volumetric energy density of the energy storage device 10 and the structural strength requirements of the housing 1, is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further improve the structural strength of the housing 1.

[0270] In some embodiments, 1.5 m≦D≦3.5 m.

[0271] D may be any one of the point values ​​1.5m, 1.8m, 2m, 2.3m, 2.5m, 2.8m, 3m, 3.2m, 3.5m, etc., or a range value between any two of these values.

[0272] In this embodiment, D≧1.5 m, which makes it possible to relatively increase the size of the housing 1 along the width direction and increase the size of the battery chamber 11 along the width direction Y of the housing, which is advantageous for improving the proportion of the size of the battery chamber 11 along the width direction Y of the housing 1 and for improving the volumetric energy density of the energy storage device 10. L≦D≦3.5 m, which makes it possible to prevent the size of the housing 1 along the width direction from becoming too large, making it easier to carry and transport the energy storage device 10.

[0273] In some embodiments, 2m≦D≦3m.

[0274] In this embodiment, D may be any one of the point values ​​2m, 2.1m, 2.2m, 2.3m, 2.4m, 2.5m, 2.6m, 2.7m, 2.8m, 2.9m, 3m, etc., or a range value between any two of these values.

[0275] In this embodiment, 2m≦D≦3m, and further, the requirements for the volumetric energy density of the energy storage device 10 and the convenience of carrying and transporting the energy storage device 10 can be satisfied at the same time.

[0276] 2 and 3, in some embodiments, a plurality of battery cells 21 arranged along the height direction Z of the housing are housed in the battery chamber 11. Along the height direction Z of the housing, the size of the battery chamber 11 is H1, and the sum of the sizes of the housings 211 of the plurality of battery cells 21 arranged in the battery chamber 11 is H2, where 0.6≦H2 / H1≦0.95 is satisfied.

[0277] The size of the battery chamber 11 along the height direction Z of the housing may be the height of the battery chamber 11, and the size of the battery chamber 11 along the height direction Z of the housing may be measured using a selected measuring tool. For example, the height direction of the housing 211 of the battery cell 21 is parallel to the height direction Z of the housing, and the sum of the sizes of the housings 211 of the multiple battery cells 21 arranged in the battery chamber 11 along the height direction Z of the housing is the sum of the heights of the housings 211 of the multiple battery cells 21, and the size of the battery cells 21 along the height direction Z of the housing may be measured using a vernier caliper. Of the multiple battery cells 21 arranged along the height direction Z of the housing, two adjacent battery cells 21 may be in direct contact with each other, or an intermediate member, such as a thermal management member or a heat insulating member, may be provided between them.

[0278] It should be noted that in this embodiment, the sizes of the housings 211 of all battery cells 21 arranged in the battery chamber 11 along the height direction Z of the housing may all be equal, and the sizes of at least two battery cells 21 may not be equal.

[0279] In this embodiment, H2 / H1 may be any one of the following point values: 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, etc., or a range value between any two of these values.

[0280] In this embodiment, H2 / H1≧0.6, which relatively increases the size ratio of the housing 211 of the plurality of battery cells 21 arranged along the height direction Z of the housing within the battery chamber 11 in the height direction Z of the housing, fully utilizing the space of the battery chamber 11 in the height direction Z of the housing and reducing the gap in the height direction Z between the housings 211 of two adjacent battery cells 21, which is advantageous for improving the volume occupancy rate of the housings 211 of all battery cells 21 in the battery chamber 11 and for improving the volumetric energy density of the energy storage device 10. H2 / H1≦0.95, which ensures sufficient installation space in the height direction Z of the battery chamber 11 for installing the plurality of battery cells 21, thereby reducing the difficulty of installing the battery cells 21.

[0281] In some embodiments, 0.7≦H2 / H1≦0.9.

[0282] In this embodiment, H2 / H1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0283] In this embodiment, 0.7≦H2 / H1≦0.9, which satisfies both the requirements for the volumetric energy density of the energy storage device 10 and ease of installation in the height direction Z of the housing of the battery cell 21, and is advantageous for improving the volumetric energy density of the energy storage device 10, and can also further reduce the difficulty of installation in the height direction Z of the housing of the battery cell 21.

[0284] In some embodiments, the size of the housing 211 of each battery cell 21 along the height direction Z of the housing is H3, and N4 battery cells 21 are arranged in the battery chamber 11, satisfying H2=H3*N4.

[0285] Here, N4 is a positive integer of 2 or more.

[0286] In this embodiment, H2=H3*N4, and the sizes of the plurality of battery cells 21 along the height direction Z of the housing 211 are made equal, which effectively reduces the possibility of wasting space due to the battery cells 21 having different sizes along the height direction Z of the housing 211. During assembly, a plurality of battery cells 21 with the same specifications are selected and arranged along the height direction Z of the housing, which improves the assembly efficiency of the energy storage device 10 and reduces the manufacturing cost of the energy storage device 10.

[0287] In some embodiments, 0.07≦H3 / H1≦0.12.

[0288] H3 / H1 may be any one of the following point values ​​or a range value between any two of the following values: 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, 0.1, 0.11, 0.12, etc.

[0289] In this embodiment, H3 / H1≧0.07, which makes the proportion of the size of the battery cell 21 in the housing 211 within the battery chamber 11 along the height direction Z of the housing relatively large, and when the size of the battery chamber 11 in the height direction Z of the housing is constant, the number of battery cells 21 accommodated within the battery chamber 11 along the height direction Z of the housing can be reduced, which reduces the possibility of reducing the available effective space due to an excessive number of battery cells 21, and is advantageous for improving the volumetric energy density of the energy storage device 10. H3 / H1≦0.12, which makes the proportion of the size of the battery cell 21 in the housing 211 within the battery chamber 11 along the height direction Z of the housing not too large, which effectively reduces the difficulty and cost of manufacturing the battery cells 21.

[0290] In some embodiments, 0.08≦H3 / H1≦0.1.

[0291] In this embodiment, H3 / H1 may be any one of the following point values ​​or a range value between any two of the following values: 0.08, 0.081, 0.082, 0.083, 0.084, 0.085, 0.086, 0.087, 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, etc.

[0292] In this embodiment, 0.08≦H3 / H1≦0.1, which is advantageous for further improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing cost of the battery cells 21.

[0293] In some embodiments, 0.17 m≦H3≦0.6 m.

[0294] H3 may be any one of the point values ​​0.17m, 0.2m, 0.25m, 0.3m, 0.35m, 0.4m, 0.45m, 0.5m, 0.55m, 0.6m, etc., or a range value between any two of these values.

[0295] In this embodiment, H3≧0.17 m, which makes the size of the battery cell 21 in the height direction Z of the housing 211 relatively large, and is advantageous for increasing the proportion of the size of the battery cell 21 in the height direction Z of the housing 211 within the battery chamber 11, and is advantageous for improving the volumetric energy density of the energy storage device 10. H3≦0.6 m, which makes the size of the battery cell 21 in the height direction Z of the housing 211 not too large, and effectively reduces the difficulty and cost of manufacturing the battery cell 21.

[0296] In some embodiments, 0.2 m≦H3≦0.45 m.

[0297] In this embodiment, H3 may be any one of the point values ​​0.2m, 0.23m, 0.25m, 0.28m, 0.3m, 0.33m, 0.35m, 0.38m, 0.4m, 0.43m, 0.45m, etc., or a range value between any two of these values.

[0298] In this embodiment, 0.2 m≦H3≦0.45 m, which is advantageous for further improving the volumetric energy density of the energy storage device 10 and reducing the manufacturing cost of the battery cells 21.

[0299] In some embodiments, the size of the housing 1 along the height direction Z of the housing is H, which satisfies 0.55≦H1 / H≦0.85.

[0300] The size along the height direction of the housing 1 is the height of the housing 1, and the height of the housing 1 may be measured using a selected measuring tool.

[0301] In this embodiment, H1 / H may be any one of the point values ​​0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, etc., or a range value between any two of these values.

[0302] In this embodiment, H1 / H≧0.55, which relatively increases the size ratio of the battery chamber 11 to the housing 1 in the height direction Z of the housing, and increases the size of the battery chamber 11 in the height direction Z of the housing, providing more space for the battery cells 21 and favoring an improvement in the volumetric energy density of the energy storage device 10. H1 / H≦0.85, which ensures that the housing 1 has sufficient space in the height direction that is not occupied by the battery chamber 11, and provides the housing 1 with sufficient structural strength.

[0303] In some embodiments, 0.65≦H1 / H≦0.78.

[0304] In this embodiment, H1 / H may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0305] In this embodiment, 0.65≦H1 / H≦0.78, which satisfies both the volumetric energy density of the energy storage device 10 and the structural strength requirements of the housing 1, is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further improve the structural strength of the housing 1.

[0306] In some embodiments, 1.5m≦H≦3.5m.

[0307] H may be any one of the point values ​​1.5m, 1.8m, 2m, 2.3m, 2.5m, 2.8m, 3m, 3.2m, 3.5m, etc., or a range value between any two of these values.

[0308] In this embodiment, H≧1.5 m, which makes it possible to relatively increase the size of the housing 1 along the height direction and increase the size of the battery chamber 11 along the height direction Z of the housing, which is advantageous for improving the proportion of the size of the battery chamber 11 along the height direction Z of the housing 1 and for improving the volumetric energy density of the energy storage device 10. H≦3.5 m, which makes it possible to prevent the size of the housing 1 along the height direction from becoming too large, making it easier to carry and transport the energy storage device 10.

[0309] In some embodiments, 2m≦H≦3m.

[0310] In this embodiment, H may be any one of the point values ​​2m, 2.1m, 2.2m, 2.3m, 2.4m, 2.5m, 2.6m, 2.7m, 2.8m, 2.9m, 3m, etc., or a range value between any two of these values.

[0311] In this embodiment, 2m≦H≦3m, and further, the requirements for the volumetric energy density of the energy storage device 10 and the convenience of carrying and transporting the energy storage device 10 can be satisfied at the same time.

[0312] 7 to 9, in some embodiments, Fig. 7 is a structural schematic diagram of an energy storage device 10 according to some embodiments of the present application, Fig. 8 is a cross-sectional view taken along line BB of the energy storage device 10 shown in Fig. 7, and Fig. 9 is an exploded view of a battery 2 according to some embodiments of the present application. At least one battery 2 is housed in the battery compartment 11, and the battery 2 includes a plurality of battery cells 21.

[0313] The battery chamber 11 may contain one or more batteries 2. For example, the housing 1 and the battery 2 are both rectangular parallelepiped. After the battery 2 is housed in the battery chamber 11, one of the longitudinal, width, and height directions of the battery 2 may be parallel to the longitudinal direction X of the housing, one of the other directions may be parallel to the width direction Y of the housing, and one of the other directions may be parallel to the height direction Z of the housing. In FIGS. 7 to 9, the longitudinal direction of the battery 2 is parallel to the width direction Y of the housing, the width direction of the battery 2 is parallel to the longitudinal direction X of the housing, and the height direction of the battery 2 is parallel to the height direction Z of the housing.

[0314] Along the longitudinal direction X of the housing, the battery chamber 11 may accommodate one battery 2 or multiple batteries 2; along the width direction Y of the housing, the battery chamber 11 may accommodate one battery 2 or multiple batteries 2; and along the height direction Z of the housing, the battery chamber 11 may accommodate one battery 2 or multiple batteries 2.

[0315] In some embodiments, the battery 2 may be a battery module, and multiple battery cells 21 may be arranged and fixed to form a battery module. In the battery module, two side plates and two end plates may form a housing, and multiple battery cells 21 may be fixed inside the housing to form the battery module.

[0316] In some other embodiments, as shown in FIG. 9 , the battery 2 may be a battery pack, and the battery 2 further includes a battery box 22, and the plurality of battery cells 21 are housed in the battery box 22. The battery box 22 may include a first portion 221 and a second portion 222, which are fitted together to define a housing space for housing the battery cells 21. The first portion 221 and the second portion 222 may have various shapes, such as a rectangular parallelepiped or a cylindrical shape. The first portion 221 may have a hollow structure with one side open, and the second portion 222 may have a hollow structure with one side open, with the open side of the second portion 222 fitted over the open side of the first portion 221 to form the battery box 22 having a housing space. The first part 221 may have a hollow structure with one side open, and the second part 222 may have a plate-like structure, and the second part 222 may be fitted over the open side of the first part 221 to form a battery box 22 having an accommodation space. The first part 221 and the second part 222 may be sealed via a sealing element, which may be a sealing ring, a sealant, or the like.

[0317] During assembly, the plurality of battery cells 21 may be assembled into the battery 2 first, and then the battery 2 may be installed in the battery chamber 11, which increases the volume of the battery 2 made up of the plurality of battery cells 21, making it easier to install in the battery chamber 11 and improving assembly efficiency.

[0318] 7, in some embodiments, a plurality of batteries 2 are housed in the battery chamber 11 and arranged along the longitudinal direction X of the housing. Along the longitudinal direction X of the housing, the size of the battery chamber 11 is L1, and the sum of the sizes of the plurality of batteries 2 arranged in the battery chamber 11 is L4, which satisfies 0.7≦L4 / L1≦0.96.

[0319] For example, the width direction of the battery 2 is parallel to the longitudinal direction X of the housing, and the sum of the sizes of the multiple batteries 2 arranged in the battery chamber 11 along the longitudinal direction X of the housing is the sum of the widths of the multiple batteries 2. The size of the battery 2 in the longitudinal direction X of the housing may be measured using a measuring tool.

[0320] It should be noted that in this embodiment, the sizes of the plurality of batteries 2 arranged in the battery chamber 11 along the longitudinal direction X of the housing may all be equal, and at least two of the batteries 2 may not be equal in size.

[0321] L4 / L1 may be any one point value of 0.7, 0.75, 0.8, 0.85, 0.9, 0.96, etc., or a range value between any two values.

[0322] In this embodiment, 0.7≦L4 / L1≦0.96, and the battery chamber 11 accommodates multiple batteries 2 arranged along the longitudinal direction X of the housing. The size of each battery 2 along the longitudinal direction X of the housing is not too large, reducing the difficulty of manufacturing and installing the batteries 2. L4 / L1≧0.7, and the proportion of the size of the multiple batteries 2 arranged along the longitudinal direction X of the housing within the battery chamber 11 along the longitudinal direction X of the housing is relatively large. This fully utilizes the space of the battery chamber 11 in the longitudinal direction X of the housing and reduces the gap between two adjacent batteries 2 in the longitudinal direction X of the housing, which is beneficial to improving the volumetric occupancy rate of all batteries 2 in the battery chamber 11 and improving the volumetric energy density of the energy storage device 10. L4 / L1≦0.96, and sufficient installation space is ensured in the battery chamber 11 for installing multiple batteries 2 along the longitudinal direction X of the housing, reducing the difficulty of installing the batteries 2.

[0323] In some embodiments, 0.78≦L4 / L1≦0.91.

[0324] In this embodiment, L4 / L1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0325] In this embodiment, 0.78≦L4 / L1≦0.91, which satisfies both the requirements for the volumetric energy density of the energy storage device 10 and the ease of installation in the longitudinal direction X of the housing of the battery 2, is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further reduce the difficulty of installation in the longitudinal direction X of the housing of the battery 2.

[0326] In some embodiments, still referring to FIG. 7, the size of each battery 2 along the longitudinal direction X of the housing is L5, and N5 batteries 2 are arranged in the battery chamber 11, satisfying L4=L5*N5.

[0327] Here, N5 is a positive integer of 2 or more.

[0328] In this embodiment, L4 = L5 * N5, and the sizes of the multiple batteries 2 along the longitudinal direction X of the housing are made equal, which effectively reduces the possibility of space being wasted due to the batteries 2 having different sizes along the longitudinal direction X of the housing. During assembly, multiple batteries 2 with the same specifications are selected and arranged along the longitudinal direction X of the housing, which improves the assembly efficiency of the energy storage device 10 and reduces the manufacturing cost of the energy storage device 10.

[0329] In some embodiments, 1 m≦L5≦1.5 m and 2≦N5≦6.

[0330] L5 may be any one point value or range value between any two of 1 m, 1.05 m, 1.1 m, 1.15 m, 1.2 m, 1.25 m, 1.3 m, 1.35 m, 1.4 m, 1.45 m, 1.5 m, etc. N5 may have a value of 2, 3, 4, 5, or 6.

[0331] In this embodiment, 1 m≦L5≦1.5 m and 2≦N5≦6. The size of each battery 2 is relatively large along the longitudinal direction X of the housing, and the number of batteries 2 is not too large. This reduces the space occupied by components other than the battery cells 21 of the batteries 2 (for example, the box wall of the battery box 22), which is advantageous for improving the size ratio along the longitudinal direction X of the housing within the battery chamber 11 of the multiple batteries 2 arranged along the longitudinal direction X of the housing.

[0332] 10 is a structural schematic diagram of an energy storage device 10 according to some embodiments of the present application. Along the longitudinal 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.

[0333] For example, the longitudinal direction of the battery 2 is parallel to the longitudinal direction X of the housing, the width direction of the battery 2 is parallel to the width direction Y of the housing, and the height direction of the battery 2 is parallel to the height direction Z of the housing. The size of the battery 2 along the longitudinal direction X of the housing is the length of the battery 2.

[0334] L5 / L1 may be any one point value of 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, 0.97, 0.99, etc., or a range value between any two of these values.

[0335] In this embodiment, the battery chamber 11 accommodates only one battery 2 along the longitudinal direction X of the housing, which is advantageous for improving the utilization rate of the space in the battery chamber 11 along the longitudinal direction X of the housing. L5 / L1≧0.8, which relatively increases the size ratio of the battery 2 within the battery chamber 11 along the longitudinal direction X of the housing, makes full use of the space in the battery chamber 11 in the longitudinal direction X of the housing, and is advantageous for improving the volume occupancy rate of all batteries 2 within the battery chamber 11, which is advantageous for improving the volumetric energy density of the energy storage device 10. L5 / L1≦0.99, which ensures sufficient installation space in the battery chamber 11 for installing the battery 2 in the longitudinal direction X of the housing, making installation of the battery 2 easier.

[0336] In some embodiments, 0.85≦L5 / L1≦0.93.

[0337] In this embodiment, L5 / L1 may be any one point value of 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, etc., or a range value between any two values.

[0338] In this embodiment, 0.85≦L5 / L1≦0.93, which satisfies both the requirements for the volumetric energy density of the energy storage device 10 and the ease of installation in the longitudinal direction X of the housing of the battery 2, is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further reduce the difficulty of installation in the longitudinal direction X of the housing of the battery 2.

[0339] In some embodiments, 4m≦L5≦8m.

[0340] L5 may be any one of the point values ​​4m, 4.5m, 5m, 5.5m, 6m, 6.5m, 7m, 7.5m, 8m, etc., or a range value between any two of these values.

[0341] In this embodiment, L5≧4 m, which makes the size of the battery 2 along the longitudinal direction X of the housing relatively large, allowing more battery cells 21 to be arranged in the battery 2 along the longitudinal direction X of the housing, and meeting the large energy requirements of the energy storage device 10; L5≦8 m, which makes the size of the battery 2 along the longitudinal direction X of the housing not too large, thereby reducing the difficulty of manufacturing and installing the battery 2.

[0342] In some embodiments, 5.5 m≦L5≦6.8 m.

[0343] In this embodiment, L5 may be any one of the point 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, etc., or a range value between any two of these values.

[0344] In this embodiment, 5.5 m≦L5≦6.8 m, which simultaneously satisfies the requirements for large energy of the energy storage device 10, economy of the battery 2, and ease of installation.

[0345] In some embodiments, referring to Figure 11, Figure 11 is a CC cross-sectional view of the energy storage device 10 shown in Figure 10. A plurality of batteries 2 arranged along the width direction Y of the housing are housed in the battery chamber 11. Along the width direction Y of the housing, the size of the battery chamber 11 is D1, and the sum of the sizes of the plurality of batteries 2 arranged in the battery chamber 11 is D4, which satisfies 0.7 ≤ D4 / D1 ≤ 0.96.

[0346] For example, the width direction of the battery 2 is parallel to the width direction Y of the housing, and the sum of the sizes of the multiple batteries 2 arranged in the battery chamber 11 along the width direction Y of the housing is the sum of the widths of the multiple batteries 2. The size of the battery 2 in the width direction Y of the housing may be measured using a measuring tool.

[0347] It should be noted that in this embodiment, the sizes of the multiple batteries 2 arranged in the battery chamber 11 along the width direction Y of the housing may all be equal, and at least two of the batteries 2 may not be equal in size.

[0348] In this embodiment, the battery chamber 11 may accommodate one battery 2 or a plurality of batteries 2 along the longitudinal direction X of the housing.

[0349] D4 / D1 may be any one of the following point values: 0.7, 0.75, 0.8, 0.85, 0.9, 0.96, etc., or a range value between any two of these values.

[0350] In this embodiment, the battery chamber 11 accommodates multiple batteries 2 arranged along the width direction Y of the housing. The size of each battery 2 along the width direction Y of the housing is not too large, reducing the difficulty of manufacturing and installing the batteries 2. D4 / D1≧0.7, which increases the size ratio of the multiple batteries 2 arranged along the width direction Y of the housing to the battery chamber 11 along the width direction Y of the housing. This fully utilizes the space in the battery chamber 11 along the width direction Y of the housing and reduces the gap between two adjacent batteries 2 in the width direction Y of the housing, thereby improving the volumetric occupancy rate of all batteries 2 in the battery chamber 11 and improving the volumetric energy density of the energy storage device 10. D4 / D1≦0.96, which ensures sufficient installation space in the battery chamber 11 for installing multiple batteries 2 along the width direction Y of the housing, reducing the difficulty of installing the batteries 2.

[0351] In some embodiments, 0.78≦D4 / D1≦0.91.

[0352] In this embodiment, D4 / D1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0353] In this embodiment, 0.78≦D4 / D1≦0.91, which satisfies both the requirements for volumetric energy density of the energy storage device 10 and ease of installation in the width direction Y of the battery 2 housing, and is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further reduce the difficulty of installation in the width direction Y of the battery 2 housing.

[0354] In some embodiments, the size of each battery 2 along the width direction Y of the housing is D5, and N6 batteries 2 are arranged in the battery chamber 11, satisfying D4=D5*N6.

[0355] Here, N6 is a positive integer of 2 or more.

[0356] In this embodiment, D4=D5*N6, and the sizes of the housings of the multiple batteries 2 along the width direction Y are made equal, which effectively reduces the possibility of space being wasted due to the different sizes of the housings of the batteries 2 along the width direction Y. During assembly, the housings of multiple batteries 2 with the same specifications are selected and arranged along the width direction Y, which improves the assembly efficiency of the energy storage device 10 and reduces the manufacturing cost of the energy storage device 10.

[0357] In some embodiments, 1 m≦D5≦1.5 m and 2≦N6≦3.

[0358] D5 may be any one point value of 1m, 1.05m, 1.1m, 1.15m, 1.2m, 1.25m, 1.3m, 1.35m, 1.4m, 1.45m, 1.5m, etc., or a range value between any two values. N6 may have a value of 2 or 3.

[0359] In this embodiment, 1m≦D5≦1.5m and 2≦N6≦3, and the size of each battery 2 is relatively large along the width direction Y of the housing, and the number of batteries 2 is not too large, which reduces the space occupied by components other than the battery cells 21 in the battery 2 (for example, the box wall of the battery box 22), and is advantageous for improving the size ratio along the width direction Y of the housing within the battery chamber 11 of the multiple batteries 2 arranged along the width direction Y of the housing.

[0360] In some embodiments, still referring to FIG. 8 , along the width direction Y of the housing, the battery chamber 11 accommodates only one battery 2, the size of the battery chamber 11 is D1, the size of the battery 2 is D5, and 0.8≦D5 / D1≦0.99 is satisfied.

[0361] In this embodiment, the battery chamber 11 may accommodate one battery 2 or multiple batteries 2 along the longitudinal direction X of the housing. For example, in Fig. 8, the battery chamber 11 accommodates multiple batteries 2 along the longitudinal direction X of the housing, with the longitudinal direction of the batteries 2 parallel to the width direction Y of the housing, the width direction of the batteries 2 parallel to the longitudinal direction X of the housing, and the height direction of the batteries 2 parallel to the height direction Z of the housing. The size of the battery 2 along the width direction Y of the housing is the length of the battery 2.

[0362] D5 / D1 may be any one point value of 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, 0.97, 0.99, etc., or a range value between any two of these values.

[0363] In this embodiment, the battery chamber 11 accommodates only one battery 2 along the width direction Y of the housing, which is advantageous for improving the utilization rate of the space in the battery chamber 11 along the width direction Y of the housing. D5 / D1≧0.8, which relatively increases the size ratio of the battery 2 within the battery chamber 11 along the width direction Y of the housing, makes full use of the space in the battery chamber 11 in the width direction Y of the housing, and is advantageous for improving the volume occupancy rate of all batteries 2 within the battery chamber 11, which is advantageous for improving the volumetric energy density of the energy storage device 10. D5 / D1≦0.99, which ensures sufficient installation space in the battery chamber 11 for installing the battery 2 in the width direction Y of the housing, making it easier to install the battery 2.

[0364] In some embodiments, 0.85≦D5 / D1≦0.93.

[0365] In this embodiment, D5 / D1 may be any one of the following point values: 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, etc., or a range value between any two of these values.

[0366] In this embodiment, 0.85≦D5 / D1≦0.93, which satisfies both the requirements for volumetric energy density of the energy storage device 10 and ease of installation in the width direction Y of the battery 2 housing, and is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further reduce the difficulty of installation in the width direction Y of the battery 2 housing.

[0367] In some embodiments, 1.5 m≦D5≦2.5 m.

[0368] D5 may be any one of the point values ​​1.5m, 1.7m, 1.9m, 2.1m, 2.3m, 2.5m, etc. or a range value between any two of these values.

[0369] In this embodiment, D5≧1.5 m, which makes the size of the battery 2 along the width direction Y of the housing relatively large, allowing more battery cells 21 to be arranged along the width direction Y of the housing in the battery 2 and meeting the large energy requirements of the energy storage device 10; D5≦2.5 m, which makes the size of the battery 2 along the width direction Y of the housing not too large, thereby reducing the difficulty of manufacturing and installing the battery 2.

[0370] In some embodiments, 1.7 m≦D5≦2.3 m.

[0371] In this embodiment, D5 may be any one of the point values ​​1.7m, 1.8m, 1.9m, 2m, 2.1m, 2.2m, 2.3m, etc., or a range value between any two of these values.

[0372] In this embodiment, 1.7 m≦D5≦2.3 m, which simultaneously satisfies the requirements for large energy of the energy storage device 10, economy of the battery 2, and ease of installation.

[0373] 7, 8, 10, and 11, in some embodiments, a plurality of batteries 2 are housed in the battery chamber 11 and arranged along the height direction Z of the housing. Along the height direction Z of the housing, the size of the battery chamber 11 is H1, and the sum of the sizes of the plurality of batteries 2 arranged in the battery chamber 11 is H4, which satisfies 0.6≦H4 / H1≦0.99.

[0374] For example, the height direction of the battery 2 is parallel to the height direction Z of the housing. The sum of the sizes of the multiple batteries 2 arranged in the battery chamber 11 along the height direction Z of the housing is the sum of the heights of the multiple batteries 2. The size of the battery 2 in the height direction Z of the housing may be measured using a measuring tool.

[0375] It should be noted that in this embodiment, the sizes of the multiple batteries 2 arranged in the battery chamber 11 along the height direction Z of the housing may all be equal, and at least two of the batteries 2 may not be equal in size.

[0376] In this embodiment, the battery chamber 11 may accommodate one battery 2 or multiple batteries 2 along the longitudinal direction X of the housing. The battery chamber 11 may accommodate one battery 2 or multiple batteries 2 along the width direction Y of the housing. In the embodiment shown in Figures 7 and 8, the battery chamber 11 accommodates multiple batteries 2 along the longitudinal direction X of the housing and one battery 2 along the width direction Y of the housing. In the embodiment shown in Figures 10 and 11, the battery chamber 11 accommodates one battery 2 along the longitudinal direction X of the housing and multiple batteries 2 along the width direction Y of the housing.

[0377] H4 / H1 may be any one of the following point values ​​or a range value between any two of the following values: 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, etc.

[0378] The battery chamber 11 accommodates a plurality of batteries 2 arranged along the height direction Z of the housing. The size of each battery 2 along the height direction Z of the housing is not too large, thereby reducing the difficulty of manufacturing and installing the batteries 2. When H4 / H1≧0.6, the proportion of the size of the batteries 2 arranged along the height direction Z of the housing within the battery chamber 11 along the height direction Z of the housing is relatively large, making full use of the space in the battery chamber 11 along the height direction Z of the housing and reducing the gap between two adjacent batteries 2 in the height direction Z of the housing, which is advantageous for improving the volume occupancy rate of all batteries 2 in the battery chamber 11 and for improving the volumetric energy density of the energy storage device 10. When H4 / H1≦0.99, sufficient installation space is secured in the battery chamber 11 along the height direction Z of the housing to install the batteries 2, thereby reducing the difficulty of installing the batteries 2.

[0379] In some embodiments, 0.7≦H4 / H1≦0.92.

[0380] H4 / H1 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0381] In this embodiment, 0.7≦H4 / H1≦0.92, which satisfies both the requirements for volumetric energy density of the energy storage device 10 and ease of installation in the height direction Z of the battery 2 housing, and is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further reduce the difficulty of installation in the height direction Z of the battery 2 housing.

[0382] In some embodiments, the size of each battery 2 along the height direction Z of the housing is H5, and N7 batteries 2 are arranged in the battery chamber 11, satisfying H4=H5*N7.

[0383] Here, N7 is a positive integer of 2 or more.

[0384] In this embodiment, H4 = H5 * N7, and the sizes of the multiple batteries 2 along the height direction Z of the housing are made equal, effectively reducing the possibility of space being wasted due to the batteries 2 having different sizes along the height direction Z of the housing. During assembly, multiple batteries 2 with the same specifications are selected and arranged along the height direction Z of the housing, improving the assembly efficiency of the energy storage device 10 and reducing the manufacturing cost of the energy storage device 10.

[0385] In some embodiments, 0.2m≦H5≦0.3m and 2≦N7≦10.

[0386] H5 may be any one point value or a range value between any two of 0.21 m, 0.22 m, 0.23 m, 0.24 m, 0.25 m, 0.26 m, 0.27 m, 0.28 m, 0.29 m, 0.3 m, etc. N7 may have a value of 2, 3, 4, 5, 6, 7, 8, 9, or 10.

[0387] In this embodiment, 0.2m≦H5≦0.3m and 2≦N7≦10, and the size of each battery 2 along the height direction Z of the housing is relatively large, and the number of batteries 2 is not too large, which reduces the space occupied by components other than the battery cells 21 in the battery 2 (e.g., the box wall of the battery box 22), and is advantageous for improving the size ratio along the height direction Z of the housing within the battery chamber 11 of the multiple batteries 2 arranged along the height direction Z of the housing.

[0388] 12, which is a cross-sectional view of an energy storage device 10 according to some embodiments of the present application. Along the height direction Z of the housing, the battery chamber 11 accommodates only one battery 2, the size of the battery chamber 11 is H1, and the size of the battery 2 is H5, satisfying 0.8≦H5 / H1≦0.99.

[0389] In this embodiment, the battery chamber 11 may accommodate one battery 2 or multiple batteries 2 along the longitudinal direction X of the housing. The battery chamber 11 may accommodate one battery 2 or multiple batteries 2 along the width direction Y of the housing. For example, in FIG. 12 , the battery chamber 11 accommodates multiple batteries 2 along the width direction Y of the housing, and the battery chamber 11 accommodates multiple batteries 2 along the longitudinal direction X of the housing.

[0390] H5 / H1 may be any one of the following point values ​​or a range value between any two of the following values: 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, 0.97, 0.99, etc.

[0391] In this embodiment, the battery chamber 11 accommodates only one battery 2 along the height direction Z of the housing, which is advantageous for improving the utilization rate of the space in the battery chamber 11 along the height direction Z of the housing. H5 / H1≧0.8 makes the size ratio of the battery 2 within the battery chamber 11 along the height direction Z of the housing relatively large, making full use of the space in the battery chamber 11 in the height direction Z of the housing, which is advantageous for improving the volume occupancy rate of all batteries 2 within the battery chamber 11 and for improving the volumetric energy density of the energy storage device 10. H5 / H1≦0.99 ensures sufficient installation space for the battery 2 in the height direction Z of the housing in the battery chamber 11, making it easier to install the battery 2.

[0392] In some embodiments, 0.85≦H5 / H1≦0.93.

[0393] In this embodiment, H5 / H1 may be any one point value of 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, etc., or a range value between any two values.

[0394] In this embodiment, 0.85≦H5 / H1≦0.93, which satisfies both the requirements for volumetric energy density of the energy storage device 10 and ease of installation in the height direction Z of the battery 2 housing, and is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further reduce the difficulty of installation in the height direction Z of the battery 2 housing.

[0395] In some embodiments, 1.5m≦H5≦2.5m.

[0396] H5 may be any one of the point values ​​1.5m, 1.7m, 1.9m, 2.1m, 2.3m, 2.5m, etc., or a range value between any two of these values.

[0397] H5≧1.5m, which makes the size of the battery 2 along the height direction Z of the housing relatively large, and the size of the battery cells 21 in the battery 2 along the height direction Z of the housing relatively large, thereby meeting the large energy requirements of the energy storage device 10; H5≦2.5m, which makes the size of the battery 2 along the height direction Z of the housing not too large, thereby reducing the difficulty of manufacturing and installing the battery 2.

[0398] In some embodiments, 1.7 m≦H5≦2.3 m.

[0399] In this embodiment, H5 may be any one of the point values ​​1.7m, 1.8m, 1.9m, 2m, 2.1m, 2.2m, 2.3m, etc., or a range value between any two of these values.

[0400] In this embodiment, 1.7 m≦H5≦2.3 m, which satisfies the requirements for large energy of the energy storage device 10, economy of the battery 2, and ease of installation at the same time.

[0401] 13 and 14, in some embodiments, Fig. 13 is a structural diagram of an energy storage device 10 according to some further embodiments of the present application, and Fig. 14 is a structural schematic diagram of the housing 1 shown in Fig. 13. The battery chamber 11 includes a plurality of sub-chambers 111, which are arranged along the longitudinal direction X of the housing, and each of the sub-chambers 111 accommodates at least one battery 2.

[0402] The number of sub-chambers 111 may be two, three, four, five, six, seven, eight, or more. Two adjacent sub-chambers 111 may be separated by a partition member 112. The partition member 112 may be a partition plate installed between the two sub-chambers 111, or a partition beam installed between the two sub-chambers 111, and the partition beam may extend along the height direction Z of the housing. When the partition member 112 is a partition beam installed between two adjacent sub-chambers 111, a plurality of partition beams may be installed between the two adjacent sub-chambers 111, and the plurality of partition beams may be arranged at intervals along the width direction Y of the housing.

[0403] The sub-chamber 111 may have various shapes, such as a cylindrical shape or a prismatic shape. The prismatic shape may be a triangular prism, a square prism, a pentagonal prism, a hexagonal prism, or the like. For example, in FIG. 13 , the sub-chamber 111 has a square prism shape, and more specifically, the sub-chamber 111 has a rectangular parallelepiped shape. The sub-chamber 111 may house one battery 2 or multiple batteries 2.

[0404] In this embodiment, the battery chamber 11 is divided into multiple sub-chambers 111, and each sub-chamber 111 may house a battery 2, allowing the batteries 2 to be housed more regularly in the battery chamber 11 and making it easier to install the batteries 2.

[0405] In some embodiments, the volume of the sub-chamber 111 is V4, and the sum of the volumes of the batteries 2 within the sub-chamber 111 is V5, satisfying 0.75≦V5 / V4≦0.95.

[0406] The volume of the sub-chamber 111 can be measured by various methods. For a sub-chamber 111 having a regular shape, taking the sub-chamber 111 as a rectangular parallelepiped, the length, width, and height of the sub-chamber 111 can be measured using a measuring tool, and the volume V4 of the sub-chamber 111 can be calculated from the measured length, width, and height of the sub-chamber 111. It can be understood that the product of the length, width, and height of the sub-chamber 111 is V4, and a measuring ruler may be used as the measuring tool. For a sub-chamber 111 having an irregular shape, it is difficult to calculate the volume of the sub-chamber 111 by measuring the outer size of the sub-chamber 111. Therefore, the volume of the sub-chamber 111 can be measured using a filling method. The specific method is as follows: The sub-chamber 111 is filled with plastic pellets. The material of the plastic pellets may be PP (polypropylene) or PE (polyethylene), the particle size is 0.5 mm to 1.5 mm, and the density is 0.94 g / cm. 3 ~0.96g / cm 3 and the volume of the sub-chamber 111 is obtained by measuring the total volume of the plastic pellets in the sub-chamber 111 using a measuring vessel. Of course, when measuring the total volume of the plastic pellets, the total weight of the plastic pellets in the sub-chamber 111 can be measured using a weighing device to calculate the total mass of the plastic pellets in the sub-chamber 111, and then the total volume of the plastic pellets can be calculated based on the total volume of the plastic pellets = total mass of the plastic pellets / density of the plastic pellets, thereby obtaining the volume V4 of the sub-chamber 111.

[0407] In this embodiment, the sub-chamber 111 may contain one or more batteries 2. When the sub-chamber 111 contains one battery 2, the sum of the volumes of the batteries 2 in the sub-chamber 111 is the volume of this battery 2. When the sub-chamber 111 contains multiple batteries 2, the sum of the volumes of all the batteries 2 in the sub-chamber 111 is the sum of the volumes of all the batteries 2 in the sub-chamber 111. The multiple batteries 2 in the sub-chamber 111 may be connected in series, parallel, or series-parallel. A series-parallel connection means that the multiple batteries 2 are connected in both series and parallel. Along the longitudinal direction X of the housing, the sub-chamber 111 may accommodate one or more batteries 2. Along the width direction Y of the housing, the sub-chamber 111 may accommodate one or more batteries 2. Along the height direction Z of the housing, the sub-chamber 111 may accommodate one or more batteries 2.

[0408] If there are multiple batteries 2 in the sub-chamber 111, the volumes of all the batteries 2 in the sub-chamber 111 may be equal, or at least two batteries 2 may be unequal. V5 is the sum of the volumes of all the batteries 2 in the sub-chamber 111. If the volumes of all the batteries 2 in the sub-chamber 111 are equal, V5 may be obtained by measuring the volume of one battery 2 and multiplying the volume of that battery 2 by the number of batteries 2 in the sub-chamber 111. If at least two of the volumes of all the batteries 2 in the sub-chamber 111 are unequal, for example, if all the batteries 2 in the sub-chamber 111 are composed of two batteries 2 with different volumes, the volume of the first type of batteries 2 may be measured first and multiplied by the number of the first type of batteries 2 in the sub-chamber 111 to obtain a third total volume, and then the volume of the second type of batteries 2 may be measured and multiplied by the number of the second type of batteries 2 in the sub-chamber 111 to obtain a fourth total volume, the sum of the third total volume and the fourth total volume being V5.

[0409] The volume of a battery 2 can be measured using various methods. For example, for a battery 2 having a regular shape, taking a rectangular parallelepiped battery 2 as an example, the length, width, and height of the battery 2 can be measured using a measuring tool, and the volume of the battery 2 can be calculated from the measured length, width, and height of the battery 2. As can be understood, the product of the length, width, and height of the battery 2 is the volume of the battery 2, and a measuring ruler may be selected as the measuring tool. It should be noted that if each outer surface of the battery 2 is flat, the length, width, and height of the battery 2 are measured based on each outer surface. If a protrusion or depression is formed on an outer surface of the battery 2, the length, width, and height of the battery 2 are measured based on the flat area of ​​that outer surface. For a battery 2 having an irregular shape, it is difficult to calculate the volume of the battery 2 by measuring the outer size of the battery 2, so the immersion method can be used to measure the volume of the battery 2. The specific method is as follows: pour liquid into the measuring container, record the volume value X3 corresponding to the liquid level, gradually immerse the battery 2 in the liquid until the battery 2 is completely immersed in the liquid, and record the volume value X4 corresponding to the liquid level at this time, where X4-X3 is the volume of the battery 2.

[0410] V5 / V4 may be any one point value of 0.75, 0.78, 0.8, 0.82, 0.85, 0.87, 0.9, 0.92, 0.95, etc., or a range value between any two of these values.

[0411] In this embodiment, V5 / V4≧0.75, and the volumetric occupancy of all batteries 2 within sub-chamber 111 is relatively large, which is advantageous for improving the space utilization rate of sub-chamber 111 and improving the volumetric energy density of energy storage device 10. V5 / V4≦0.95, and the volumetric occupancy of all batteries 2 within sub-chamber 111 is not too large, which reduces the assembly accuracy requirements for placing batteries 2 within sub-chamber 111 and effectively controls the manufacturing cost of energy storage device 10 within a reasonable range.

[0412] In some embodiments, 0.82≦V5 / V4≦0.9.

[0413] In this embodiment, V5 / V4 may be any one 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 values.

[0414] In this embodiment, 0.82≦V5 / V4≦0.9, which satisfies both the volumetric energy density requirements of the energy storage device 10 and the requirements for economy, is advantageous in further reducing the manufacturing cost of the energy storage device 10, and improving the volumetric energy density of the energy storage device 10.

[0415] 13 , in some embodiments, the sub-chamber 111 accommodates only one battery 2 along the longitudinal direction X of the housing. In this way, the space occupied by components other than the battery cells 21 of the battery 2 (e.g., the box wall of the battery box 22) can be reduced, which is advantageous for improving the proportion of the battery 2 in the sub-chamber 111 along the longitudinal direction X of the housing and for improving the utilization rate of the space of the sub-chamber 111 along the longitudinal direction X of the housing.

[0416] In some embodiments, along the longitudinal direction X of the housing, the size of the sub-chamber 111 is L6, the size of the battery 2 is L5, and 0.85≦L5 / L6≦0.99 is satisfied.

[0417] For example, the subchamber 111 and the battery 2 are rectangular parallelepiped-shaped, with the longitudinal direction of the subchamber 111 and the longitudinal direction of the battery 2 parallel to the width direction Y of the housing, the width direction of the subchamber 111 and the width direction of the battery 2 parallel to the longitudinal direction X of the housing, and the height direction of the subchamber 111 and the height direction of the battery 2 parallel to the height direction Z of the housing. The size of the subchamber 111 along the longitudinal direction X of the housing is the width of the subchamber 111, and the size of the battery 2 along the longitudinal direction X of the housing is the width of the battery 2.

[0418] L5 / L6 may be any one point value of 0.85, 0.88, 0.9, 0.93, 0.95, 0.97, 0.99, etc., or a range value between any two of these values.

[0419] In this embodiment, L5 / L6≧0.85, which relatively increases the size ratio of the battery 2 in the sub-chamber 111 along the longitudinal direction X of the housing, fully utilizes the space of the sub-chamber 111 in the longitudinal direction X of the housing, and is advantageous for improving the volume occupancy rate of all the batteries 2 within the sub-chamber 111 and for improving the volumetric energy density of the energy storage device 10. L5 / L6≦0.99 ensures sufficient mounting space for the battery 2 in the sub-chamber 111 along the longitudinal direction X of the housing, making it easier to mount the battery 2.

[0420] In some embodiments, 0.88≦L5 / L6≦0.95.

[0421] In this embodiment, L5 / L6 may be any one point value of 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, etc., or a range value between any two of these values.

[0422] In this embodiment, 0.88≦L5 / L6≦0.95, which satisfies both the requirements for the volumetric energy density of the energy storage device 10 and the ease of installation in the longitudinal direction X of the housing of the battery 2, is advantageous for improving the volumetric energy density of the energy storage device 10 and can also further reduce the difficulty of installation in the longitudinal direction X of the housing of the battery 2.

[0423] In some embodiments, referring to Figure 15, Figure 15 is a DD cross-sectional view of the energy storage device 10 shown in Figure 13. Along the width direction Y of the housing, the sub-chamber 111 accommodates only one battery 2.

[0424] In this embodiment, the sub-chamber 111 may accommodate one battery 2 or multiple batteries 2 along the longitudinal direction X of the housing.

[0425] In this embodiment, the sub-chamber 111 accommodates only one battery 2 along the width direction Y of the housing, thereby reducing the space occupied by components other than the battery cell 21 of the battery 2 (for example, the box wall of the battery box 22), which is advantageous for improving the proportion of the battery 2 along the width direction Y of the housing within the sub-chamber 111 and for improving the utilization rate of the space along the width direction Y of the housing in the sub-chamber 111.

[0426] In some embodiments, and still referring to FIG. 13, the sub-chamber 111 accommodates a plurality of batteries 2 along the height direction Z of the housing.

[0427] In this embodiment, along the longitudinal direction X of the housing, the sub-chamber 111 may accommodate one battery 2 or multiple batteries 2. Along the width direction Y of the housing, the sub-chamber 111 may accommodate one battery 2 or multiple batteries 2.

[0428] Along the height direction of the sub-chamber 111, the number of batteries 2 housed in the sub-chamber 111 may be two, three, four, five, six, seven, eight, nine, ten or more.

[0429] For example, along the longitudinal direction X of the housing, each sub-chamber 111 accommodates only one battery 2, along the width direction Y of the housing, each sub-chamber 111 accommodates only one battery 2, and along the height direction Z of the housing, each sub-chamber 111 accommodates multiple batteries 2. All batteries 2 in each sub-chamber 111 are connected in series. Of two adjacent sub-chambers 111, all batteries 2 in one sub-chamber 111 are connected in series to form a first assembled battery (battery cluster), and all batteries 2 in the other sub-chamber 111 are connected in series to form a second assembled battery (battery cluster), with the first assembled battery and the second assembled battery being connected in parallel. In an embodiment in which 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 for the battery clusters, and the busbar unit in the electrical compartment can realize busbars for parallel connection of the multiple battery clusters, thereby realizing safe connection between the multiple battery clusters and the DC side of an energy storage converter (PCS, Power Conversion System).

[0430] For example, support members 113 are installed on both sides of each sub-chamber 111 along the longitudinal direction X of the housing. Along the height direction Z of the housing, the support members 113 are located at the bottom of the batteries 2 and are used to support the batteries 2. The support members 113 may be attached to the chamber wall and the partition member 112 of the battery chamber 11. The installation of the support members 113 improves the stability of each battery 2 within the sub-chamber 111, while maintaining a constant distance between two adjacent batteries 2 along the height direction Z of the housing within the sub-chamber 111, thereby minimizing the impact on adjacent batteries 2 when inserting or removing one battery 2.

[0431] In this embodiment, the sub-chamber 111 accommodates multiple batteries 2 along the height direction Z of the housing, thereby reducing the size of a single battery 2 in the height direction Z of the housing and reducing the difficulty and cost of manufacturing the batteries 2.

[0432] In some embodiments, the number of sub-chambers 111 is four or less.

[0433] In this embodiment, there may be two, three or four sub-chambers 111. In the embodiment shown in Figure 13, there are four sub-chambers 111.

[0434] In this embodiment, the number of sub-chambers 111 is four or less, and the number of partition members separating two adjacent sub-chambers 111 within the battery chamber 11 is relatively small, thereby reducing the space occupied by the partition members in the battery chamber 11, providing more space for the battery 2, and improving the space utilization rate of the battery chamber 11.

[0435] In some embodiments, the volume of the battery 2 is V6, and the sum of the volumes of the housings 211 of the multiple battery cells 21 of the battery 2 is V7, where 0.5≦V7 / V6≦0.8 is satisfied.

[0436] 16 and 17, for example, FIG. 16 is a structural schematic diagram of a battery 2 according to some embodiments of the present application, and FIG. 17 is an E-E cross-sectional view of the battery 2 shown in FIG. 16. The battery 2 includes a battery box 22 and a plurality of battery cells 21, which are housed in the battery box 22. The battery box 22 may include a first portion 221 and a second portion 222, which are fitted over each other to define a housing space for housing the battery cells 21. The volume of the battery box 22 is the volume V6 of the battery 2. For example, if the battery box 22 is a rectangular parallelepiped, the length, width, and height of the battery box 22 can be measured with a measuring tool, and the volume of the battery box 22 can be calculated from the measured length, width, and height of the battery box 22, thereby obtaining the volume V6 of the battery 2. As can be appreciated, the product of the length, width, and height of the battery box 22 is the volume of the battery box 22, where the measuring tool may be selected as a measuring ruler.

[0437] The multiple battery cells 21 of the battery 2 may be connected in series, parallel, or series-parallel. The multiple battery cells 21 may be connected in series, parallel, or series-parallel via busbar members 23, which may be made of a metal conductor such as copper, iron, aluminum, steel, or an aluminum alloy. The battery 2 may further include a thermal management member, which may be installed in the battery box 22 or integrated into the box wall of the battery box 22 to manage the temperature of the battery cells 21. The thermal management member may be a water-cooled plate that contains a fluid medium.

[0438] V7 is the sum of the volumes of the housings 211 of all the battery cells 21 of the battery 2, and the volumes of the housings 211 of all the battery cells 21 of the battery 2 may be equal, or the volumes of the housings 211 of at least two battery cells 21 may not be equal. If the volumes of the housings 211 of all the battery cells 21 of the battery 2 are equal, V7 may be obtained by measuring the volume of the housing 211 of one battery cell 21 and then multiplying the volume of the housing 211 of this battery cell 21 by the number of battery cells 21 of the battery 2. If the volumes of the housings 211 of at least two battery cells 21 in the battery 2 are unequal, for example, if the housings 211 of all battery cells 21 in the battery 2 are composed of two housings 211 with different volumes, the volume of the housings 211 of the first type of battery cells 21 can be first measured, and the volume of the housings 211 of the first type of battery cells 21 can be multiplied by the number of first type battery cells 21 in the battery 2 to obtain a fifth total volume, and then the volume of the housings 211 of the second type of battery cells 21 can be measured, and the volume of the housings 211 of the second type of battery cells 21 can be multiplied by the number of second type battery cells 21 in the battery 2 to obtain a sixth total volume, and the sum of the fifth total volume and the sixth total volume is V7.

[0439] In this embodiment, V7 / V6 may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0440] In this embodiment, V7 / V6≧0.5, which makes the volumetric occupancy rate of all battery cells 21 of battery 2 relatively large in battery 2, improves the utilization rate of the internal space of battery 2, and increases the volumetric energy density of battery 2, which is advantageous for increasing the volumetric energy density of the energy storage device 10; V7 / V6≦0.8, which makes the volumetric occupancy rate of all battery cells 21 of battery 2 not too large, providing more space for other components of battery 2 (e.g., busbar members 23, thermal management members, etc.), thereby reducing the difficulty of assembling battery 2 and the manufacturing costs.

[0441] In some embodiments, 0.58≦V7 / V6≦0.7.

[0442] In this embodiment, V7 / V6 may be any one 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, etc., or a range value between any two values.

[0443] In this embodiment, 0.58≦V7 / V6≦0.7 is satisfied, which simultaneously satisfies the requirements for the volumetric energy density of the battery 2, the economic efficiency of the battery 2, and ease of assembly. This is advantageous for further improving the volumetric energy density of the battery 2 and reducing the difficulty of assembling the battery 2 and the manufacturing cost.

[0444] In some embodiments, the number of battery cells 21 in the battery 2 is N8, and the volume of the housing 211 of each battery cell 21 is V3, satisfying V7=V3*N8.

[0445] Here, N8 is a positive integer of 2 or greater.

[0446] In this embodiment, V7=V3*N8, and the volumes of the housings 211 of all the battery cells 21 of the battery 2 may be made equal, and battery cells 21 with the same specifications may be selected. This is advantageous for improving the assembly efficiency of the battery 2, and also reduces the possibility of wasting space due to different specifications of the battery cells 21 of the battery 2.

[0447] In some embodiments, still referring to FIGS. 16 and 17 , the battery 2 includes p*q battery cells 21, which are arranged in p rows and q columns, with the battery cells 21 in each row arranged along the longitudinal direction X of the housing and the battery cells 21 in each column arranged along the width direction Y of the housing, where p and q are both positive integers.

[0448] In the battery 2, all the battery cells 21 are arranged in a rectangular array of p rows and q columns. There are q battery cells 21 in each row of the battery cells 21, and p battery cells 21 in each column of the battery cells 21. There are multiple battery cells 21 in the battery 2, and at least one of p and q is 2 or greater.

[0449] For example, p and q are both greater than 2, each column of battery cells 21 includes a plurality of battery cell groups connected in series, each battery cell group includes a plurality of battery cells 21 connected in parallel, and two adjacent columns of battery cells 21 are connected in parallel. In the example shown in Fig. 17, p = 26 and q = 4, each column of battery cells 21 includes 26 battery cells 21, every two battery cells 21 are connected in parallel to form 13 battery cell groups, and the 13 battery cell groups are connected in series, and four columns of battery cells 21 are connected in parallel.

[0450] In an embodiment in which the housing 211 (not shown in FIGS. 16 and 17) of the battery cell 21 is rectangular, one of the longitudinal direction, width direction, and height direction of the housing 211 is parallel to the longitudinal 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. In the embodiment shown in FIGS. 16 and 17, the longitudinal direction of the housing 211 is parallel to the longitudinal direction X of the housing, the width direction of the housing 211 is parallel to the width direction Y of the housing, and the height direction of the housing 211 is parallel to the height direction Z of the housing.

[0451] In an embodiment in which a thermal management element is installed within the battery 2, the thermal management element may be installed between two adjacent battery cells 21 in each column of the battery cells 21, or between two adjacent battery cells 21 in each row of the battery cells 21.

[0452] In this embodiment, all the battery cells 21 of the battery 2 are distributed in a rectangular array, which is advantageous in making the arrangement of the battery cells 21 of the battery 2 more regular and increasing the space utilization rate of the battery 2.

[0453] In some embodiments, in each row of battery cells 21, the sum of the sizes of the q battery cells 21 along the longitudinal direction X of the housing 211 is L7, and the size of the battery 2 along the longitudinal direction X of the housing is L5, satisfying 0.8≦L7 / L5≦0.95.

[0454] In each row of battery cells 21, the sizes of q battery cells 21 along the longitudinal direction X of the housing 211 may be equal, and the sizes of at least two battery cells 21 along the longitudinal direction X of the housing 211 may not be equal.

[0455] In the embodiment shown in FIGS. 16 and 17 , the longitudinal direction of the housing 211 of the battery cell 21 and the width direction of the battery 2 are parallel to the longitudinal direction X of the casing, and the sum of the sizes of the housings 211 of the q battery cells 21 along the longitudinal direction X of the casing is the sum of the lengths of the housings 211 of the q battery cells 21, and the size of the battery 2 along the longitudinal direction X of the casing is the width of the battery 2.

[0456] In this embodiment, L7 / L5 may be any one point value of 0.8, 0.83, 0.85, 0.87, 0.9, 0.92, 0.95, etc., or a range value between any two values.

[0457] When L7 / L5≧0.8, the proportion of the size of the housings 211 of the battery cells 21 in each row along the longitudinal direction X of the battery 2 is relatively large, making full use of the space in the longitudinal direction X of the battery 2's housing and reducing the gap in the longitudinal direction X between the housings 211 of two adjacent battery cells 21, which is beneficial to improving the volume occupancy rate of the housings 211 of all battery cells 21 in the battery 2 and improving the volumetric energy density of the battery 2. When L7 / L5≦0.95, the proportion of the size of the housings 211 of the battery cells 21 in each row along the longitudinal direction X of the battery 2's housing is not too large, which reduces the difficulty and cost of manufacturing the battery 2.

[0458] In some embodiments, 0.85≦L7 / L5≦0.9.

[0459] In this embodiment, L7 / L5 may be any one point value of 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, etc., or a range value between any two values.

[0460] In this embodiment, 0.85≦L7 / L5≦0.9, which simultaneously satisfies the requirements for the volumetric energy density of the battery 2, the ease of manufacturing the battery 2, and the cost efficiency of the battery 2. This is advantageous for further improving the volumetric energy density of the battery 2 and reducing the ease and cost of manufacturing the battery 2.

[0461] In some embodiments, the size of the housing 211 of each battery cell 21 along the longitudinal direction X of the housing is L3, where L3=L7 / q, 0.17 m≦L3≦0.6 m, and 1≦q≦5 are satisfied.

[0462] L3 may be any one point value or a range value between any two of 0.17m, 0.2m, 0.25m, 0.3m, 0.35m, 0.4m, 0.45m, 0.5m, 0.55m, 0.6m, etc. q may be 1, 2, 3, 4, or 5.

[0463] In this embodiment, L3=L7 / q, and the battery cells 21 in each row of the battery 2 are equal in size along the longitudinal direction X of the housing 211, and the battery cells 21 in each row may be selected to have the same specifications. However, 0.17 m≦L3≦0.6 m and 1≦q≦5. In this way, the size of each battery cell 21 in each row is relatively large, and the number of batteries 2 is not too large. This reduces the space occupied by the walls of the housing 211 in the longitudinal direction X, which is advantageous for improving the size ratio of the battery cells 21 in each row of the housing 211 to the battery 2 in the longitudinal direction X, and is advantageous for improving the space utilization rate of the battery 2 and the volumetric energy density of the battery 2.

[0464] In some embodiments, q=4 and 0.2m≦L3≦0.3m.

[0465] In this embodiment, L3 may be any one of the point values ​​0.2m, 0.21m, 0.22m, 0.23m, 0.24m, 0.25m, 0.26m, 0.27m, 0.28m, 0.29m, 0.3m, etc., or a range value between any two of these values.

[0466] When there are four battery cells 21 in each row of battery cells 21, the size of the housing 211 of the battery cells 21 is controlled within the range of 0.2 m to 0.3 m, so that the battery 2 has a relatively high volumetric energy density.

[0467] In some embodiments, q=2, and 0.4m≦L3≦0.6m.

[0468] In this embodiment, L3 may be any one of the point values ​​0.4m, 0.43m, 0.45m, 0.48m, 0.5m, 0.53m, 0.55m, 0.58m, 0.6m, etc., or a range value between any two of these values.

[0469] When there are two battery cells 21 in each row of battery cells 21, the size of the housing 211 of the battery cells 21 is controlled within the range of 0.4m≦L3≦0.6m, so that the battery 2 has a relatively high volumetric energy density.

[0470] In some embodiments, in each row of battery cells 21, the sum of the sizes of the p battery cells 21 along the width direction Y of the housing 211 is D7, and the size of the battery 2 along the width direction Y of the housing is D5, satisfying 0.75≦D7 / D5≦0.95.

[0471] In each row of battery cells 21, the size of p battery cells 21 along the width direction Y of the housing 211 may be equal, and the size of at least two battery cells 21 along the width direction Y of the housing 211 may not be equal.

[0472] In the embodiment shown in Figures 16 and 17, the width direction of the housing 211 of the battery cell 21 and the longitudinal direction of the battery 2 are parallel to the width direction Y of the housing, and the sum of the sizes of the housings 211 of the p battery cells 21 along the width direction Y of the housing is the sum of the widths of the housings 211 of the p battery cells 21, and the size of the battery 2 along the width direction Y of the housing is the length of the battery 2.

[0473] In this embodiment, D7 / D5 may be any one of the following point values ​​or a range value between any two of the following values: 0.75, 0.78, 0.8, 0.83, 0.85, 0.87, 0.9, 0.92, 0.95, etc.

[0474] In some embodiments, D7 / D5≧0.75, which makes the proportion of the size of the housings 211 of the battery cells 21 in each row along the width direction Y of the housing of the battery 2 relatively large, fully utilizing the space in the width direction Y of the housing of the battery 2 and reducing the gap in the width direction Y of the housing between two adjacent battery cells 21, which is advantageous for improving the volume occupancy rate of the housings 211 of all battery cells 21 in the battery 2 and for improving the volumetric energy density of the battery 2. D7 / D5≦0.95, which makes the proportion of the size of the housings 211 of the battery cells 21 in each row along the width direction Y of the housing of the battery 2 not too large, which reduces the difficulty and cost of manufacturing the battery 2.

[0475] In some embodiments, 0.82≦D7 / D5≦0.9.

[0476] In this embodiment, D7 / D5 may be any one of the following point values ​​or a range value between any two of the following values: 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, etc.

[0477] In this embodiment, 0.82≦D7 / D5≦0.9, which simultaneously satisfies the requirements for the volumetric energy density of the battery 2, the ease of manufacturing the battery 2, and the cost efficiency of the battery 2. This is advantageous for further improving the volumetric energy density of the battery 2 and reducing the ease and cost of manufacturing the battery 2.

[0478] In some embodiments, the size of the housing 211 of each battery cell 21 along the width direction Y of the housing is D3, where D3=D7 / p, 0.04 m≦D3≦0.12 m, and 20≦p≦30 are satisfied.

[0479] D3 may be any one point value or a range value between any two of 0.04m, 0.05m, 0.06m, 0.07m, 0.08m, 0.09m, 0.1m, 0.11m, 0.12m, etc. p may be 20, 21, 22, 23, 24, 25, 26, 28, 29, or 30.

[0480] In this embodiment, D3=D7 / p, and the size of the battery cells 21 in each row of the battery 2 along the width direction Y of the housing 211 is made equal, and the battery cells 21 in each row may be selected to have the same specifications. However, 0.04 m≦D3≦0.12 m and 20≦p≦30. In this way, the size of each battery cell 21 in each row is relatively large, and the number of batteries 2 is not too large. This reduces the space occupied by the walls of the housing 211 in the width direction Y, which is advantageous for improving the size ratio of the battery cells 21 in each row along the width direction Y of the housing 211, improving the space utilization rate of the battery 2, and improving the volumetric energy density of the battery 2.

[0481] In some embodiments, 0.06 m≦D3≦0.08 m and 24≦p≦28.

[0482] In this embodiment, D3 may be any one of the point values ​​0.06m, 0.063m, 0.065m, 0.068m, 0.07m, 0.073m, 0.075m, 0.078m, 0.08m, etc., or a range value between any two of these values. p may be 24, 25, 26, or 28.

[0483] In this embodiment, 0.06m≦D3≦0.08m and 24≦p≦28, and such a battery 2 has a relatively high volumetric energy density.

[0484] In some embodiments, the size of the housing 211 of the battery cell 21 along the height direction Z of the housing is H3, and the size of the battery 2 along the height direction Z of the housing is H5, satisfying 0.75≦H3 / H5≦0.95.

[0485] In the embodiment shown in Figures 16 and 17, the height direction of the housing 211 of the battery cell 21 and the height direction of the battery 2 are parallel to the height direction Z of the housing, and the size of the housing 211 of the battery cell 21 along the height direction Z of the housing is the height of the housing 211 of the battery cell 21, and the size of the battery 2 along the height direction Z of the housing is the height of the battery 2.

[0486] H3 / H5 may be any one of the following point values ​​or a range value between any two of the following values: 0.75, 0.78, 0.8, 0.83, 0.85, 0.87, 0.9, 0.92, 0.95, etc.

[0487] In this embodiment, H3 / H5≧0.75, which makes the size ratio of the housing 211 of the battery cells 21 along the height direction Z of the battery 2 casing relatively large, making full use of the space in the height direction Z of the battery 2 casing, which is advantageous for improving the volume occupancy rate of the housing 211 of all battery cells 21 in the battery 2 and for improving the volumetric energy density of the battery 2. H3 / H5≦0.95, which makes the size ratio of the housing 211 of the battery cells 21 along the height direction Z of the battery 2 casing not too large, which reduces the difficulty and cost of manufacturing the battery 2.

[0488] In some embodiments, 0.82≦H3 / H5≦0.9.

[0489] In this embodiment, H3 / H5 may be any one of the following point values ​​or a range value between any two of the following values: 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, etc.

[0490] In this embodiment, 0.82≦H3 / H5≦0.9, which simultaneously satisfies the requirements for the volumetric energy density of the battery 2, the ease of manufacturing the battery 2, and the cost-effectiveness of the battery 2. This is advantageous for further improving the volumetric energy density of the battery 2 and reducing the ease and cost of manufacturing the battery 2.

[0491] In some embodiments, 0.17 m≦H3≦0.6 m.

[0492] H3 may be any one of the point values ​​0.17m, 0.2m, 0.25m, 0.3m, 0.35m, 0.4m, 0.45m, 0.5m, 0.55m, 0.6m, etc., or a range value between any two of these values.

[0493] In this embodiment, H3≧0.17 m, which makes the size of the battery cell 21 along the height direction Z of the housing 211 of the battery cell 21 relatively large, and is advantageous for improving the proportion of the size of the battery cell 21 along the height direction Z of the housing 211 of the battery cell 21, and is advantageous for improving the volumetric energy density of the battery cell 21. H3≦0.6 m, which makes the size of the battery cell 21 along the height direction Z of the housing 211 of the battery cell 21 not too large, and effectively reduces the difficulty and cost of manufacturing the battery cell 21.

[0494] In some embodiments, 0.2 m≦H3≦0.45 m.

[0495] In this embodiment, H3 may be any one of the point values ​​0.2m, 0.23m, 0.25m, 0.28m, 0.3m, 0.33m, 0.35m, 0.38m, 0.4m, 0.43m, 0.45m, etc., or a range value between any two of these values.

[0496] In this embodiment, 0.2m≦H3≦0.45m is satisfied, simultaneously satisfying the requirements for the volumetric energy density of the battery 2, the ease of manufacturing the battery 2, and the cost efficiency of the battery 2. This is advantageous for further improving the volumetric energy density of the battery 2 and reducing the ease and cost of manufacturing the battery 2.

[0497] 18 to 21, in some embodiments, Fig. 18 is a perspective view of a battery cell 21 according to some embodiments of the present application, Fig. 19 is an exploded view of the battery cell 21 shown in Fig. 18, Fig. 20 is a cross-sectional exploded view of the battery cell 21 shown in Fig. 18 taken along a UW plane, and Fig. 21 is a cross-sectional exploded view of the battery cell 21 taken along a VW plane. The battery cell 21 further includes at least one electrode assembly 213, and the electrode assembly 213 is housed in a housing 211. The housing 211 has a rectangular parallelepiped shape, and the size of the housing 211 in a first direction U is W1, the size of the housing 211 in a second direction V is T1, and the size of the housing 211 in a third direction W is K1, and one of the first direction U, the second direction V, and the third direction W is parallel to the longitudinal 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. The housing 211 includes a first wall 2113 and a second wall 2114 that are arranged opposite each other along a first direction U, a third wall 2115 and a fourth wall 2116 that are arranged opposite each other along a second direction V, and a fifth wall 2117 and a sixth wall 2118 that are arranged opposite each other along a third direction W, wherein 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, and (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≧0.9 is satisfied.

[0498] W1*T1*K1 represents the volume of the housing 211, i.e., V3=W1*T1*K1.

[0499] There may be one or more electrode assemblies 213 in the housing 211. When there are multiple electrode assemblies 213 in the housing 211, the multiple electrode assemblies 213 may be connected in parallel.

[0500] The housing 211 has a rectangular parallelepiped shape, which may be a rectangular parallelepiped, a cube, or the like. Of the six walls of the housing 211, four walls may form the housing 211 and the other two walls may be end caps 2112, or five walls may form the housing 211 and the other wall may be end caps 2112. The size of the housing 211 in the first direction U, the size of the housing 211 in the second direction V, the size of the housing 211 in the third direction W, the thickness of the first wall 2113, the thickness of the second wall 2114, the thickness of the third wall 2115, the thickness of the fourth wall 2116, the thickness of the fifth wall 2117, and the thickness of the sixth wall 2118 can all be measured with a vernier caliper.

[0501] For example, first wall 2113, second wall 2114, third wall 2115, fourth wall 2116, fifth wall 2117, and sixth wall 2118 are all made of an aluminum alloy having the following mass contents: aluminum >= 96.7%, 0.05% <= copper <= 0.2%, iron <= 0.7%, manganese <= 1.5%, silicon <= 0.6%, zinc <= 0.1%, other single element components <= 0.05%, and other total element components <= 0.15%.

[0502] For example, the first direction U is the longitudinal direction of the housing 211 of the battery cell 21, the second direction V is the width direction of the housing 211 of the battery cell 21, and the third direction W is the height direction of the housing 211 of the battery cell 21. As can be understood, W1 is the length of the housing 211 of the battery cell 21, T1 is the width of the housing 211 of the battery cell 21, and K1 is the height of the housing 211 of the battery cell 21.

[0503] (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1) may be any one of the following point values ​​or a range value between any two of the following values: 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, etc.

[0504] Here, (W1-a)*(T1-b)*(K1-c) may be understood as the volume of the interior space of the housing 211, i.e., the volume of the space enclosed by the inner surface of the housing 211. W1*T1*K1 is the volume of the housing 211. It should be noted that in an embodiment in which a convex hull 2112b is formed on the end cap 2112 of the housing 211 that protrudes from the outer surface 2112a of the end cap, the volume of the housing 211 does not include the volume of the convex hull 2112b.

[0505] If the outer surfaces of the six walls of the housing 211 are all flat, W1, T1, and K1 are measured based on the outer surface of each wall. For example, if the outer surfaces of the fifth wall 2117 and the sixth wall 2118 are all flat, K1 is the distance between the outer surfaces of the fifth wall 2117 and the sixth wall 2118 along the third direction W.

[0506] When a protrusion or recess is formed on the outer surface of a wall of the housing 211, W1, T1, and K1 are measured based on the flat area of ​​this outer surface (i.e., the area other than the protrusion or recess). For example, if the outer surface of the fifth wall 2117 is flat and a first protrusion is formed on the outer surface of the sixth wall 2118 (e.g., the sixth wall 2118 is the end cap 2112 and the protrusion formed on the end cap 2112 is the first protrusion), K1 is the distance along the third direction W between the flat area on the outer surface of the sixth wall 2118 other than the first protrusion and the outer surface of the fifth wall 2117. If a first protrusion is formed on the outer surface of the sixth wall 2118 and a second protrusion is formed on the outer surface of the fifth wall 2117, K1 is the distance along the third direction W between the flat area on the outer surface of the fifth wall 2117 other than the second protrusion and the flat area on the outer surface of the sixth wall 2118 other than the first protrusion.

[0507] If all six walls of the housing 211 are of uniform thickness, the thickness of each wall can be obtained by measuring the distance between the outer and inner surfaces of the wall from any position on the wall. If a wall of the housing 211 is of non-uniform thickness, the thickness of the wall can be obtained by measuring the distance between the outer and inner surfaces of the wall from the point where the wall is thickest. In other words, if the thickness of a wall is non-uniform, the maximum thickness of the wall is used to calculate a, b, or c.

[0508] In such a battery cell 21, the ratio of the volume of the internal space of the housing 211 of the battery cell 21 to the volume of the housing 211 is 0.9 or more, which relatively increases the occupancy rate of the internal space of the housing 211 and increases the space available for the housing 211 to accommodate the electrode assembly 213, thereby improving the volumetric energy density of the battery cell 21 under the same chemical system.

[0509] A specific explanation will be given below using specific experimental data.

[0510] In the experiment, a rectangular housing battery cell was selected as the battery cell 21, and the case 2111 of the housing 211 had a hollow structure with one end open, and the battery cell 21 had one end cap 2112.

[0511] [Table 2]

[0512] As can be seen from a comparison between Examples 13 to 16 and Comparative Example 3 based on Table 2 above, when the positive electrode material of the battery cell 21 contains a lithium-containing phosphate, (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≧0.9, and the volumetric energy density of the battery cell 21 can be effectively improved. As can be seen from a comparison between Examples 17 to 20 and Comparative Example 4, when the positive electrode material of the battery cell 21 contains a lithium transition metal oxide, (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≧0.9, and the volumetric energy density of the battery cell 21 can be effectively improved. As can be seen from a comparison between Examples 21 to 24 and Comparative Example 5, when the battery cell 21 is a sodium ion battery cell, (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≧0.9, and the volumetric energy density of the battery cell 21 can be effectively improved.

[0513] In some embodiments, (W1-a) / W1≧0.97, (T1-b) / T1≧0.965, and (K1-c) / K1≧0.965.

[0514] By setting the ratio of W1-a to W1 to 0.97 or more, the length of the internal space of the housing 211 can be increased to accommodate a longer electrode assembly 213 when the length of the battery cell 21 remains unchanged, thereby improving the volumetric energy density of the battery cell 21 under the same chemical material system. (W1-a) / W1 may be any one of the following values: 0.97, 0.975, 0.98, 0.985, 0.99, 0.995, etc., or a value in the range between any two of these values.

[0515] By setting the ratio of T1-b to T1 to 0.965 or more, the width of the internal space of the housing 211 can be increased to accommodate a wider electrode assembly 213 when the width of the battery cell 21 remains unchanged, thereby improving the volumetric energy density of the battery cell 21 under the same chemical material system. (T1-b) / T1 may be any one of the following values, such as 0.965, 0.97, 0.975, 0.98, 0.985, 0.99, and 0.995, or a value in the range between any two of these values.

[0516] By setting the ratio of K1-c to K1 to 0.965 or more, the height of the internal space of the housing 211 can be increased to accommodate a taller electrode assembly 213 when the height of the battery cell 21 remains unchanged, thereby improving the volumetric energy density of the battery cell 21 under the same chemical material system. (K1-c) / K1 may be any one of the following values, such as 0.965, 0.97, 0.975, 0.98, 0.985, 0.99, and 0.995, or a value in the range between any two of these values.

[0517] In some embodiments, still referring to Figures 18 to 21, the housing 211 includes a case 2111 and an end cap 2112, the case 2111 has an opening, the end cap 2112 covers the opening, the end cap 2112 has an electrode terminal 212 installed therein, the case 2111 includes an integrally molded 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.

[0518] In this embodiment, the case 2111 has a hollow structure with an opening formed at one end, and the housing 211 has one end cap 2112. The end cap 2112 and the case 2111 are installed separately and connected, and the end cap 2112 and the case 2111 may be connected by welding or seaming, for example.

[0519] When assembling the battery 2, the electrode terminal 212 may be attached to the end cap 2112 first, and then the electrode assembly 213 may be housed in the case 2111, and the end cap 2112 may then be placed over the opening of the case 2111, thereby reducing the difficulty of attaching the electrode assembly 213 to the housing 211 and also reducing the difficulty of attaching the electrode terminal 212 to the housing 211.

[0520] 20 and 21, in some embodiments, the thicknesses of the first wall 2113 and the second wall 2114 are both a1, where 2*a1=a, the thicknesses of the third wall 2115 and the fourth wall 2116 are both b1, where 2*b1=b, the thickness of the fifth wall 2117 is c1, and the thickness of the sixth wall 2118 is c2, where c2>c1, c1>a1, and c1>b1. 0.5mm≦a1≦1.5mm, 0.5≦b1≦1.5mm, 1.0mm≦c1≦2.5mm, and 1.5mm≦c2≦4mm.

[0521] In order to reduce the possibility of interference with the case 2111 during the process of inserting the electrode assembly 213 into the case 2111 and to reduce the risk of damage to the electrode assembly 213, a certain assembly gap (i.e., a case insertion gap) is left for the electrode assembly 213 when designing the case 2111, and this assembly gap may be 0.8 to 2 mm.

[0522] In addition, an insulating member may be installed inside the housing 211 to reduce the possibility of an internal short circuit occurring in the battery cell 21, but this inevitably occupies some of the internal space of the housing 211, thereby reducing the space available for the electrode assembly 213 and the electrolyte.

[0523] 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 the fifth wall 2117. The second insulating member 215 is disposed between the sixth wall 2118 and the electrode assembly 213 and abuts the sixth wall 2118. The maximum size of the first insulating member 214 in the third direction W is e1, and the maximum size of the second insulating member 215 in the third direction W is e2, satisfying (W1-a-1.6 mm)*(T1-b-1.6 mm)*(K1-c-e1-e2) / (W1*T1*K1)≧0.88, 0.3 mm≦e1≦1.2 mm, and 2 mm≦e2≦10 mm.

[0524] (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e1-e2) / (W1*T1*K1) may be any one of the following point values ​​or a range value between any two of the following values: 0.88, 0.89, 0.90, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, etc.

[0525] e1 may be any one of the following point values ​​or a range value between any two of the following values: 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, etc.

[0526] e2 may be any one of the following point values: 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two of these values.

[0527] In this embodiment, W1-a-1.6 mm refers to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the first direction U when the assembly gap between the electrode assembly 213 and the case 2111 is 0.8 mm. T1-b-1.6 mm refers to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the second direction V when the assembly gap between the electrode assembly 213 and the case 2111 is 0.8 mm. K1-c-e1-e2 refer to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the third direction W when the first insulating member 214 abutting against the fifth wall 2117 is installed between the fifth wall 2117 and the electrode assembly 213, and the second insulating member 215 abutting against the sixth wall 2118 is installed between the sixth wall 2118 and the electrode assembly 213. The first insulating member 214 may be the bottom pallet and the second insulating member 215 may be the bottom plastic.

[0528] In this embodiment, (W1-a-1.6 mm)*(T1-b-1.6 mm)*(K1-c-e1-e2) / (W1*T1*K1)≧0.88, which increases the space left for the electrode assembly 213 inside the housing 211 and allows for the accommodation of an electrode assembly 213 with a larger volume, thereby further improving the volumetric energy density of the battery cell 21.

[0529] 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 the fifth wall 2117. The second insulating member 215 is disposed between the sixth wall 2118 and the electrode assembly 213 and abuts the sixth wall 2118. The maximum size of the first insulating member 214 in the third direction W is e1, and the maximum size of the second insulating member 215 in the third direction W is e2, satisfying (W1-a-4 mm)*(T1-b-4 mm)*(K1-c-e1-e2) / (W1*T1*K1)≧0.85, 0.3 mm≦e1≦1.2 mm, and 2 mm≦e2≦10 mm.

[0530] (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1) may be any one point value of 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, etc., or a range value between any two of these values.

[0531] e1 may be any one of the following point values ​​or a range value between any two of the following values: 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, etc.

[0532] e2 may be any one of the following point values: 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two of these values.

[0533] In this embodiment, W1-a-4 mm refers to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the first direction U when the assembly gap between the electrode assembly 213 and the case 2111 is 2 mm. T1-b-4 mm refers to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the second direction V when the assembly gap between the electrode assembly 213 and the case 2111 is 2 mm. K1-c-e1-e2 refer to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the third direction W when the first insulating member 214 abutting against the fifth wall 2117 is installed between the fifth wall 2117 and the electrode assembly 213, and the second insulating member 215 abutting against the sixth wall 2118 is installed between the sixth wall 2118 and the electrode assembly 213.

[0534] In this embodiment, (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1)≧0.85, which increases the space left for the electrode assembly 213 inside the housing 211 and allows for the accommodation of an electrode assembly 213 with a larger volume, thereby further improving the volumetric energy density of the battery cell 21.

[0535] In some embodiments, W1≧T1, the first direction U is parallel to the longitudinal direction X of the housing, the second direction V is parallel to the width direction Y of the housing, and the third direction W is parallel to the height direction Z of the housing.

[0536] For example, the first direction U is the longitudinal direction of the housing 211 of the battery cell 21, the second direction V is the width direction of the housing 211 of the battery cell 21, and the third direction W is the height direction of the housing 211 of the battery cell 21, whereby the longitudinal direction of the housing 211 is parallel to the longitudinal direction X of the housing, the width direction of the housing 211 is parallel to the width direction Y of the housing, and the height direction of the housing 211 is parallel to the height direction Z of the housing.

[0537] When the end cap 2112 is installed only at one end of the case 2111 and W1≧T1, it is advantageous to install the end cap 2112 and the fifth wall 2117 of the housing 211 opposite each other along the height direction Z of the housing, install the first wall 2113 and the second wall 2114 of the housing 211 opposite each other along the longitudinal direction X of the housing, and install the third wall 2115 and the fourth wall 2116 of the housing 211 opposite each other along the width direction Y of the housing, in order to improve the volume occupancy rate of all the battery cells 21 within the battery chamber 11.

[0538] 22 to 25, in some embodiments, Fig. 22 is a perspective view of a battery cell 21 according to some other embodiments of the present application, Fig. 23 is an exploded view of the battery cell 21 shown in Fig. 22, Fig. 24 is an exploded cross-sectional view of the battery cell 21 shown in Fig. 22 taken along a UW plane, and Fig. 25 is an exploded cross-sectional view of the battery cell 21 shown in Fig. 22 taken along a VW plane. The housing 211 includes a case 2111 and two end caps 2112, the case 2111 has two openings arranged opposite each other along a third direction W, the two end caps 2112 respectively cover the two openings, and an electrode terminal 212 is installed in at least one of the end caps 2112. The case 2111 includes an integrally molded first wall 2113, a second wall 2114, a third wall 2115, and a fourth wall 2116, and the two end caps 2112 are a fifth wall 2117 and a sixth wall 2118, respectively.

[0539] In this embodiment, the case 2111 has a hollow structure with openings formed at both ends, and the housing 211 has two end caps 2112, which seal the openings at both ends of the case 2111, respectively.

[0540] 24 and 25, in some embodiments, the thickness of the first wall 2113 and the thickness of the second wall 2114 are both a1, where 2*a1=a, the thickness of the third wall 2115 and the thickness of the fourth wall 2116 are both b1, where 2*b1=b, and the thickness of the fifth wall 2117 and the thickness of the sixth wall 2118 are c1, where 2*c1=c, where c1>a1, c1>b1. 0.5mm≦a1≦1.5mm, 0.5≦b1≦1.5mm, 1.0mm≦c1≦4mm.

[0541] In order to reduce the possibility of interference with the case 2111 during the process of inserting the electrode assembly 213 into the case 2111 and to reduce the risk of damage to the electrode assembly 213, a certain assembly gap (i.e., a case insertion gap) is left for the electrode assembly 213 when designing the case 2111, and this assembly gap may be 0.8 to 2 mm.

[0542] In addition, an insulating member may be installed inside the housing 211 to reduce the possibility of an internal short circuit occurring in the battery cell 21, but this inevitably occupies some of the internal space of the housing 211, thereby reducing the space available for the electrode assembly 213 and the electrolyte.

[0543] 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 the fifth wall 2117. The fourth insulating member 217 is disposed between the sixth wall 2118 and the electrode assembly 213 and abuts the sixth wall 2118. The maximum size of the third insulating member 216 in the third direction W is e3, and the maximum size of the fourth insulating member 217 in the third direction W is e4, satisfying (W1-a-1.6 mm)*(T1-b-1.6 mm)*(K1-c-e3-e4) / (W1*T1*K1)≧0.88, 2 mm≦e3≦10 mm, and 2 mm≦e4≦10 mm.

[0544] (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e3-e4) / (W1*T1*K1) may be any one of the following point values ​​or a range value between any two of the following values: 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.98, 0.99, etc.

[0545] e3 may be any one of the point values ​​2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two of these values.

[0546] e4 may be any one of the point values ​​2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two of these values.

[0547] In this embodiment, W1-a-1.6 mm refers to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the first direction U when the assembly gap between the electrode assembly 213 and the case 2111 is 0.8 mm. T1-b-1.6 mm refers to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the second direction V when the assembly gap between the electrode assembly 213 and the case 2111 is 0.8 mm. K1-c-e3-e4 refer to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the third direction W when the third insulating member 216 abutting against the fifth wall 2117 is installed between the fifth wall 2117 and the electrode assembly 213, and the fourth insulating member 217 abutting against the sixth wall 2118 is installed between the sixth wall 2118 and the electrode assembly 213. The third insulating member 216 and the fourth insulating member 217 may both be made of a lower plastic.

[0548] In this embodiment, (W1-a-1.6 mm)*(T1-b-1.6 mm)*(K1-c-e3-e4) / (W1*T1*K1)≧0.88, which increases the space left for the electrode assembly 213 inside the housing 211 and allows for the accommodation of an electrode assembly 213 with a larger volume, thereby further improving the volumetric energy density of the battery cell 21.

[0549] 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 the fifth wall 2117. The fourth insulating member 217 is disposed between the sixth wall 2118 and the electrode assembly 213 and abuts the sixth wall 2118. The maximum size of the third insulating member 216 in the third direction W is e3, and the maximum size of the fourth insulating member 217 in the third direction W is e4, satisfying (W1-a-4 mm)*(T1-b-4 mm)*(K1-c-e3-e4) / (W1*T1*K1)≧0.85, 2 mm≦e3≦10 mm, and 2 mm≦e4≦10 mm.

[0550] (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1) may be any one point value of 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, etc., or a range value between any two of these values.

[0551] e3 may be any one of the point values ​​2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two of these values.

[0552] e4 may be any one of the point values ​​2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two of these values.

[0553] In this embodiment, W1-a-4 mm refers to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the first direction U when the assembly gap between the electrode assembly 213 and the case 2111 is 2 mm. T1-b-4 mm refers to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the second direction V when the assembly gap between the electrode assembly 213 and the case 2111 is 2 mm. K1-c-e3-e4 refer to the maximum size of the internal space of the housing 211 left for the electrode assembly 213 along the third direction W when the third insulating member 216 abutting against the fifth wall 2117 is installed between the fifth wall 2117 and the electrode assembly 213, and the fourth insulating member 217 abutting against the sixth wall 2118 is installed between the sixth wall 2118 and the electrode assembly 213.

[0554] In this embodiment, (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1)≧0.85, which increases the space left for the electrode assembly 213 inside the housing 211 and allows for the accommodation of an electrode assembly 213 with a larger volume, thereby further improving the volumetric energy density of the battery cell 21.

[0555] In some embodiments, W1≧T1, the first direction U is parallel to the height direction Z of the housing, the second direction V is parallel to the width direction Y of the housing, and the third direction W is parallel to the longitudinal direction X of the housing.

[0556] For example, the first direction U is the longitudinal direction of the housing 211 of the battery cell 21, the second direction V is the width direction of the housing 211 of the battery cell 21, and the third direction W is the height direction of the housing 211 of the battery cell 21, whereby the longitudinal direction of the housing 211 is parallel to the height direction Z of the housing, the width direction of the housing 211 is parallel to the width direction Y of the housing, and the height direction of the housing 211 is parallel to the longitudinal direction X of the housing.

[0557] In some embodiments, 0.0026 m 3 ≦W1*T1*K1≦0.008m 3 is.

[0558] In this example, W1*T1*K1 is 0.0026 m 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 value may be any one point value or a range value between any two values.

[0559] In some embodiments, 0.004 m 3 ≦W1*T1*K1≦0.006m 3 is.

[0560] In this example, W1*T1*K1 is 0.004 m 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 , 0.0049m3 , 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 value may be any one point value or a range value between any two values.

[0561] End caps 2112 are installed on both ends of the case 2111, and when W1≧T1, the two end caps 2112 of the housing 211 are arranged along the longitudinal direction X of the housing, the first wall 2113 and the second wall 2114 of the housing 211 are arranged along the height direction Z of the housing, and the third wall 2115 and the fourth wall 2116 of the housing 211 are installed opposite each other along the width direction Y of the housing, which is advantageous for improving the volume occupancy rate of all battery cells 21 within the battery chamber 11.

[0562] In some embodiments, the positive electrode material of battery cell 21 includes a lithium-containing phosphate, and the capacity of battery cell 21 is C, where C≧350 Ah and C / ((W1−a)*(T1−b)*(K1−c))≧118 Ah / L.

[0563] The lithium-containing phosphate includes at least one of lithium iron phosphate (e.g., LiFePO4 (which may be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon, but is not limited to them.

[0564] When the positive electrode material of the battery cell 21 includes a lithium-containing phosphate and C≧350 Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) to 118 Ah / L or more can improve the volume occupancy rate of the internal space of the housing 211 of the battery cell 21, which is advantageous in realizing a ratio of the volume of the internal space of the housing 211 of the battery cell 21 to the volume of the housing 211 of 0.9 or more.

[0565] In some embodiments, the positive electrode material of battery cell 21 includes a lithium transition metal oxide, and the capacity of battery cell 21 is C, where C≧650 Ah and C / ((W1−a)*(T1−b)*(K1−c))≧190 Ah / L.

[0566] Lithium transition metal oxides include lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(NCM 333 (may be abbreviated as "LiNi") 0.5 Co 0.2 Mn 0.3 O2(NCM 523 (may be abbreviated as "LiNi") 0.5 Co 0.25 Mn 0.25 O2(NCM 211 (may be abbreviated as "LiNi") 0.6 Co 0.2 Mn 0.2 O2(NCM 622 (may be abbreviated as "LiNi") 0.8 Co 0.1 Mn 0.1 O2(NCM 811 ), lithium nickel cobalt aluminum oxide (e.g., LiNi 0.85 Co 0.15 Al 0.05O2) and its modifying compounds, etc.

[0567] When the positive electrode material of the battery cell 21 contains a lithium transition metal oxide and C≧650 Ah, setting C / ((W1-a)*(T1-b)*(K1-c)) to 190 Ah / L or more can improve the volume occupancy rate of the internal space of the housing 211 of the battery cell 21, and is advantageous in realizing a ratio of the volume of the internal space of the housing 211 of the battery cell 21 to the volume of the housing 211 of 0.9 or more.

[0568] In some embodiments, the battery cell 21 is a sodium-ion battery cell 21, and the capacity of the battery cell 21 is C, where C≧260 Ah and C / ((W1−a)*(T1−b)*(K1−c))≧87 Ah / L.

[0569] When the battery cell 21 is a sodium ion battery cell 21 and C≧260 Ah, setting C / ((W1−a)*(T1−b)*(K1−c)) to 87 Ah / L or more can improve the volume occupancy rate of the battery cell 21 in the internal space of the housing 211, which is advantageous in realizing a ratio of the volume of the internal space of the battery cell 21 in the housing 211 to the volume of the housing 211 of 0.9 or more.

[0570] It should be noted that, unless there is a conflict, the embodiments and features in the embodiments in the present application can be combined with each other.

[0571] The above examples are only intended to illustrate the technical solution of the present application and are not intended to limit the present application, and those skilled in the art may make various modifications and variations to the present application, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. [Explanation of symbols]

[0572] 1 - housing, 11 - battery compartment, 111 - sub-compartment, 112 - partition member, 113 - support member, 13 - thermal management compartment, 15 - main control compartment, 2 - battery, 21 - battery cell, 211 - housing, 2111 - case, 2112 - end cap, 2112a - outer surface of end cap, 2112b - convex hull, 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 - tab, 214 - first insulating member, 215 - second insulating member, 216 - third insulating member, 217 - fourth insulating member, 22 - battery box, 221 - first part, 222 - second part, 23 - busbar member, 10 - energy storage device, U - first direction, V - second direction, W - third direction, X - longitudinal direction of the housing, Y - width direction of the housing, Z - height direction of the housing

Claims

1. 1. An energy storage device, comprising: The volume of the battery cell housing in the energy storage device is 0.0026 m ３ That's all, The energy storage device is a housing having a battery chamber, the battery chamber including a plurality of sub-chambers arranged along a longitudinal direction of the housing, a partition member provided in the battery chamber, and two adjacent sub-chambers separated by the partition member; a plurality of batteries, each of the sub-chambers accommodating at least one battery, the battery including p*q battery cells, the p*q battery cells arranged in p rows and q columns, the battery cells in each row being installed along the longitudinal direction of the housing, and the battery cells in each column being installed along the width direction of the housing, p and q being positive integers, the battery cells including the housing and electrode terminals, the electrode terminals being connected to the plurality of batteries installed in the housing; Including, The volume of the battery compartment is V １ and the sum of the volumes of the housings of all the battery cells in the battery chamber is V ２ and 0.4≦V ２ / V １ ≦0.

95.

2. 0.5≦V ２ / V １ ≦0.85, and optionally 0.52≦V ２ / V １ ≦0.

75.

3. The volume of the housing is V ３ and 0.0001≦V ３ / V １ ≦0.00025, and optionally 0.00015≦V ３ / V １ 3. The energy storage device of claim 1, wherein the ρ is ≦0.0002.

4. The volume of the housing is V ３ and 0.0035 m ３ ≦V ３ ≦0.008m ３ and optionally 0.004 m ３ ≦V ３ ≦0.006 m ３ The energy storage device according to claim 1 , wherein

5. The volume of the housing is V, and 0.45≦V １ / V≦0.75, and optionally, 0.55≦V １ 5. The energy storage device according to claim 1, wherein V≦0.

65.

6. 20m ３ ≦V≦80m ３ and optionally, 35 m ３ ≦V≦50m ３ 6. The energy storage device of claim 5, wherein:

7. The battery chamber accommodates a plurality of the battery cells arranged along the longitudinal direction of the housing, Along the longitudinal direction, the size of the battery compartment is L １ and the sum of the sizes of the housings of the battery cells arranged in the battery chamber is L ２ and 0.6≦L ２ / L １ ≦0.95, and optionally, 0.75≦L ２ / L １ 7. The energy storage device of claim 1, wherein the ρ is ≦0.

9.

8. Along the longitudinal direction, the size of the housing of each of the battery cells is L ３ and in the battery compartment, ２ The battery cells are arranged in an array, and L ２ =L ３ *N ２ The energy storage device of claim 7, wherein

9. 0.03≦L ３ / L １ ≦0.12, and optionally 0.055≦L ３ / L １ 9. The energy storage device of claim 8, wherein the ρ is ≦0.

09.

10. 0.17m≦L ３ ≦0.6 m, and optionally 0.2 m≦L ３ 10. The energy storage device of claim 8 or 9, wherein the thickness is ≦0.45 m.

11. The size of the housing along the longitudinal direction is L, and 0.65≦L １ / L≦0.95, and optionally, 0.75≦L １ 11. The energy storage device according to claim 7, wherein / L≦0.

9.

12. 12. The energy storage device of claim 11, wherein 3m≦L≦9m, and optionally 5m≦L≦7m.

13. The battery chamber accommodates a plurality of the battery cells arranged along the width direction of the housing, The size of the battery chamber along the width direction is D １ and the sum of the sizes of the housings of the plurality of battery cells arranged in the battery chamber is D ２ and 0.6≦D ２ / D １ ≦0.95, and optionally, 0.75≦D ２ / D １ 13. The energy storage device of claim 1, wherein the R is ≦0.

9.

14. The size of the housing of each of the battery cells along the width direction is D ３ and in the battery compartment, ３ The battery cells are arranged in an array, and D ２ =D ３ *N ３ The energy storage device of claim 13 , wherein

15. 0.02≦D ３ / D １ ≦0.05, and optionally 0.032≦D ３ / D １ 15. The energy storage device of claim 14, wherein the R is ≦0.

04.

16. 0.04m≦D ３ ≦0.12 m, and optionally 0.06 m≦D ３ 16. The energy storage device of claim 14 or 15, wherein the thickness is ≦0.08 m.

17. The size of the housing along the width direction is D, and 0.65≦D １ / D≦0.99, and optionally, 0.75≦D １ 17. The energy storage device of claim 13, wherein / D≦0.

92.

18. 18. The energy storage device of claim 17, wherein 1.5m≦D≦3.5m, and optionally 2m≦D≦3m.

19. The battery chamber accommodates a plurality of the battery cells arranged along the height direction of the housing, Along the height direction, the size of the battery compartment is H １ and the sum of the sizes of the housings of the battery cells arranged in the battery chamber is H ２ and 0.6≦H ２ / H １ ≦0.95, and optionally, 0.7≦H ２ / H １ 19. The energy storage device of claim 1, wherein the R is ≦0.

9.

20. Along the height direction, the size of the housing of each of the battery cells is H ３ and in the battery compartment, ４ The battery cells are arranged in an array, and H ２ = H ３ *N ４ 20. The energy storage device of claim 19, wherein

21. 0.07≦H ３ / H １ ≦0.12, and optionally 0.08≦H ３ / H １ 21. The energy storage device of claim 20, wherein ≦0.

1.

22. 0.17m≦H ３ ≦0.6 m, and optionally 0.2 m≦H ３ 21. The energy storage device of claim 19 or 20, wherein the thickness is ≦0.45 m.

23. The size of the housing along the height direction is H, and 0.55≦H １ / H≦0.85, and optionally, 0.65≦H １ 23. The energy storage device of claim 19, wherein / H≦0.

78.

24. 24. The energy storage device of claim 23, wherein 1.5m≦H≦3.5m, and optionally 2m≦H≦3m.

25. The battery chamber accommodates a plurality of the batteries arranged along the longitudinal direction of the housing, Along the longitudinal direction, the size of the battery compartment is L １ and the sum of the sizes of the plurality of batteries arranged in the battery chamber is L ４ and 0.7≦L ４ / L １ ≦0.96, and optionally, 0.78≦L ４ / L １ 25. The energy storage device of claim 1, wherein the R is ≦0.

91.

26. Along the longitudinal direction, the size of each of the batteries is L ５ and in the battery compartment, ５ The batteries are arranged in an array, ４ =L ５ *N ５ 26. The energy storage device of claim 25, wherein

27. 1m≦L ５ ≦1.5m, 2≦N ５ 27. The energy storage device of claim 26, wherein: ≦6.

28. The battery chamber accommodates a plurality of the batteries arranged along the width direction of the housing, The size of the battery chamber along the width direction is D １ The sum of the sizes of the batteries arranged in the battery chamber is D ４ and 0.7≦D ４ / D １ ≦0.96, and optionally, 0.78≦D ４ / D １ 28. The energy storage device of claim 1, wherein the R is ≦0.

91.

29. Along the width direction, the size of each of the batteries is D ５ and in the battery compartment, ６ The batteries are arranged in an array, and D ４ =D ５ *N ６ 30. The energy storage device of claim 28, wherein

30. 1m≦D ５ ≦1.5m, 2≦N ６ 30. The energy storage device of claim 29, wherein:

31. The battery chamber accommodates only one battery along the width direction of the housing, and the size of the battery chamber is D １ and the size of the battery is D ５ and 0.8≦D ５ / D １ ≦0.99, and optionally, 0.85≦D ５ / D １ 28. The energy storage device of claim 1, wherein the R is ≦0.

93.

32. 1.5m≦D ５ ≦2.5 m, and optionally 1.7 m≦D ５ 32. The energy storage device of claim 31 , wherein the distance between the first and second electrodes is ≦2.3 m.

33. The battery chamber accommodates a plurality of the batteries arranged along the height direction of the housing, Along the height direction, the size of the battery compartment is H １ The sum of the sizes of the batteries arranged in the battery chamber is H ４ and 0.6≦H ４ / H １ ≦0.99, and optionally, 0.7≦H ４ / H １ 33. The energy storage device of claim 1, wherein the R is ≦0.

92.

34. Along the height direction, the size of each of the batteries is H ５ and in the battery compartment, ７ The batteries are arranged in an array, and H ４ = H ５ *N ７ 34. The energy storage device of claim 33, wherein

35. 0.2m≦H ５ ≦0.3m, 2≦N ７ 35. The energy storage device of claim 34, wherein: ≦10.

36. Along the height direction of the housing, the battery chamber accommodates only one battery, and the size of the battery chamber is H １ and the size of the battery is H ５ and 0.8≦H ５ / H １ ≦0.99, and optionally, 0.85≦H ５ / H １ 33. The energy storage device of claim 1, wherein the R is ≦0.

93.

37. 1.5m≦H ５ ≦2.5m, and optionally 1.7m≦H ５ 37. The energy storage device of claim 36, wherein the distance between the first and second electrodes is ≦2.3 m.

38. The volume of the sub-chamber is V ４ and the sum of the volumes of the batteries in the sub-chambers is V ５ and 0.75≦V ５ / V ４ ≦0.95, and optionally, 0.82≦V ５ / V ４ 38. The energy storage device of claim 1, wherein the R is ≦0.

9.

39. 39. The energy storage device of claim 1, wherein along the length of the housing, each sub-compartment houses only one battery.

40. Along the longitudinal direction, the size of the sub-chamber is L ６ and the size of the battery is L ５ and 0.85≦L ５ / L ６ ≦0.99, and optionally, 0.88≦L ５ / L ６ 40. The energy storage device of claim 39, wherein the R is ≦0.

95.

41. 41. The energy storage device of claim 1, wherein the sub-chamber accommodates only one battery along the width of the housing.

42. 42. The energy storage device of claim 1, wherein the sub-chamber houses a plurality of the batteries along a height direction of the housing.

43. 43. The energy storage device of claim 1, wherein the number of sub-chambers is four or less.

44. The volume of the battery is V ６ and the sum of the volumes of the housings of the battery cells of the battery is V ７ and 0.5≦V ７ / V ６ ≦0.8, and optionally, 0.58≦V ７ / V ６ 44. The energy storage device of any one of claims 1 to 43, wherein ≤ 0.

7.

45. The number of the battery cells of the battery is N ８ and the volume of the housing of each battery cell is V ３ and V ７ =V ３ *N ８ 45. The energy storage device of claim 44, wherein

46. In each row of the battery cells, the sum of the sizes of the q battery cells along the longitudinal direction of the housing is L ７ and the size of the battery along the longitudinal direction is L ５ and 0.8≦L ７ / L ５ ≦0.95, and optionally, 0.85≦L ７ / L ５ 46. ​​The energy storage device of any one of claims 1 to 45, wherein ≤ 0.

9.

47. Along the longitudinal direction, the size of the housing of each of the battery cells is L ３ and L ３ =L ７ / q, 0.17m≦L ３ 47. The energy storage device of claim 46, wherein q is less than 0.6 m and 1 is less than q and 5 is satisfied.

48. q=4, 0.2m≦L ３ 48. The energy storage device of claim 47, wherein the distance is ≦0.3 m.

49. q=2, 0.4m≦L ３ 48. The energy storage device of claim 47, wherein the distance between the first and second electrodes is ≦0.6 m.

50. In each row of the battery cells, the sum of the sizes of the p battery cells along the width direction of the housing is D ７ and the size of the battery along the width direction is D ５ and 0.75≦D ７ / D ５ ≦0.95, and optionally, 0.82≦D ７ / D ５ 50. The energy storage device of claim 1, wherein the R is ≦0.

9.

51. The size of the housing of each of the battery cells along the width direction is D ３ and D ３ =D ７ / p, 0.04m≦D ３ 51. The energy storage device of claim 50, wherein p is less than 0.12 m and 20 is less than p is less than 30.

52. 0.06m≦D ３ 52. The energy storage device of claim 51, wherein p is ≦0.08 m and 24≦p≦28.

53. The size of the battery cell along the height direction of the housing of the case is H ３ and the size of the battery along the height direction is H ５ and 0.75≦H ３ / H ５ ≦0.95, and optionally, 0.82≦H ３ / H ５ 53. The energy storage device of any one of claims 1 to 52, wherein ≤ 0.

9.

54. 0.17m≦H ３ ≦0.6 m, and optionally 0.2 m≦H ３ 54. The energy storage device of claim 53, wherein the distance between the first and second electrodes is ≦0.45 m.

55. The battery cell further includes at least one electrode assembly; The electrode assembly is contained within the housing; The housing has a rectangular parallelepiped shape, and the size of the housing in a first direction is W １ and the size of the housing in the second direction is T １ and the size of the housing in the third direction is K １ and one of the first direction, the second direction, and the third direction is parallel to a longitudinal direction of the housing, another is parallel to a width direction of the housing, and still another is parallel to a height direction of the housing; The housing includes a first wall and a second wall disposed opposite each other along the first direction, a third wall and a fourth wall disposed opposite each other along the second direction, and a fifth wall and a sixth wall disposed opposite each other along the third direction, wherein a sum of thicknesses of the first wall and the second wall is a, a sum of thicknesses of the third wall and the fourth wall is b, a sum of thicknesses of the fifth wall and the sixth wall is c, and (W １ −a)*(T １ −b)*(K １ −c) / (W １ *T １ *K １ ) ≧0.

9.

56. (W １ -a) / W １ ≧0.97, (T １ -b) / T １ ≧0.965, and (K １ -c) / K １ 56. The energy storage device of claim 55, wherein the Ratio is > 0.

965.

57. The housing includes a case and an end cap, the case has an opening, the end cap is placed over the opening, and the electrode terminal is provided on the end cap; 57. The energy storage device of claim 55 or 56, wherein the case includes the first wall, the second wall, the third wall, the fourth wall, and the fifth wall integrally formed therewith, and the end cap is the sixth wall.

58. 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 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 size of the first insulating member in the third direction is e １ and the maximum size of the second insulating member in the third direction is e ２ and (W １ -a-1.6mm)*(T １ -b-1.6mm)*(K １ -c-e １ -e ２ ) / (W １ *T １ *K １ ) ≧ 0.88, 0.3 mm ≦ e １ ≦1.2 mm and 2 mm≦e ２ 58. The energy storage device of claim 57, wherein the thickness is less than or equal to 10 mm.

59. 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 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 size of the first insulating member in the third direction is e １ and the maximum size of the second insulating member in the third direction is e ２ and (W １ -a-4mm)*(T １ -b-4mm)*(K １ -c-e １ -e ２ ) / (W １ *T １ *K １ ) ≧ 0.85, 0.3 mm ≦ e １ ≦1.2 mm and 2 mm≦e ２ 59. The energy storage device of claim 57 or 58, wherein the thickness satisfies ≦10 mm.

60. W １ ≧T １ 60. The energy storage device of claim 57, wherein the first direction is parallel to a longitudinal direction of the housing, the second direction is parallel to a width direction of the housing, and the third direction is parallel to a height direction of the housing.

61. The housing includes a case and two end caps; the case has two openings arranged opposite to each other along the third direction, the two end caps respectively cover the two openings, and the electrode terminal is installed on at least one of the end caps; the case includes the first wall, the second wall, the third wall, and the fourth wall, which are integrally formed; 57. The energy storage device of claim 55 or 56, wherein the two end caps are the fifth wall and the sixth wall, respectively.

62. 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 size of the third insulating member in the third direction is e ３ and the maximum size of the fourth insulating member in the third direction is e ４ and (W １ -a-1.6mm)*(T １ -b-1.6mm)*(K １ -c-e ３ -e ４ ) / (W １ *T １ *K １ ) ≧ 0.88, 2 mm ≦ e ３ ≦10 mm and 2 mm≦e ４ 62. The energy storage device of claim 61, wherein the thickness is less than or equal to 10 mm.

63. 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 size of the third insulating member in the third direction is e ３ and the maximum size of the fourth insulating member in the third direction is e ４ and (W １ -a-4mm)*(T １ -b-4mm)*(K １ -c-e ３ -e ４ ) / (W １ *T １ *K １ ) ≧ 0.85, 2 mm ≦ e ３ ≦10 mm and 2 mm≦e ４ 63. The energy storage device of claim 61 or 62, wherein the thickness satisfies ≦10 mm.

64. W １ ≧T １ 64. The energy storage device of claim 61, wherein the first direction is parallel to a height direction of the housing, the second direction is parallel to a width direction of the housing, and the third direction is parallel to a longitudinal direction of the housing.

65. the positive electrode material of the battery cell comprises a lithium-containing phosphate; The capacity of the battery cell is C, C≧350Ah, C / ((W １ −a)*(T １ −b)*(K １ The energy storage device according to any one of claims 55 to 64, wherein -c))≧118 Ah / L is satisfied.

66. the positive electrode material of the battery cell comprises a lithium transition metal oxide; The capacity of the battery cell is C, C≧650Ah, C / ((W １ −a)*(T １ −b)*(K １ The energy storage device according to any one of claims 55 to 64, wherein -c)) ≥ 190 Ah / L is satisfied.

67. the battery cell is a sodium ion battery cell; The capacity of the battery cell is C, C≧260Ah, C / ((W １ −a)*(T １ −b)*(K １ The energy storage device according to any one of claims 55 to 64, wherein -c)) ≥ 87 Ah / L is satisfied.

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