Energy storage device and energy storage system

Abstract

An embodiment of the present application provides an energy storage device and an energy storage system. The energy storage device is used to electrically connect an energy storage converter, and the energy storage converter can be used to cooperate with M energy storage devices. The rated output power of the energy storage converter is P, the energy of the energy storage device is Q, and the time it takes for the energy storage device to discharge from a fully charged state to a fully discharged state is A, where 0.7≦P / (M*Q / A)≦0.99 is satisfied. P / (M*Q / A)≦0.99 ensures that the power of all energy storage devices cooperated with the energy storage converter has a sufficient margin compared to the power of the energy storage converter, eliminating the need for long-term capacity replenishment of the energy storage devices and achieving long-term reliability of the energy storage devices. P / (M*Q / A)≧0.7 ensures that the power of the energy storage devices does not have too much margin compared to the power of the energy storage converter, reducing power waste and improving the economic efficiency of the energy storage devices. This improves power matching between the energy storage devices and the energy storage converter.

Description

[Technical Field]

[0001] TECHNICAL FIELD This application relates to the field of energy storage technology, and in particular to energy storage devices and systems. [Background technology]

[0002] An energy storage device is a device that stores and transfers electrical energy. Energy storage devices can be used in power systems 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.

[0003] An energy storage device generally includes a housing and a plurality of battery cells installed inside the housing, and the plurality of battery cells are connected in series, parallel, or series-parallel to store electrical energy. The energy storage device generally needs to be connected to an energy storage converter to charge and discharge the energy storage device. Currently, the power matching between the energy storage device and the energy storage converter is relatively poor. Summary of the Invention

[0004] The embodiments of the present application provide an energy storage device and an energy storage system that can effectively improve the power matching between the energy storage device and the energy storage converter.

[0005] According to a first aspect, an embodiment of the present application provides an energy storage device for electrically connecting an energy storage converter, wherein the energy storage converter is usable to cooperate with M energy storage devices, M is a positive integer, the rated output power of the energy storage converter is P in W, the energy of the energy storage devices is Q in Wh, and the time length for the energy storage devices to discharge from a fully charged state to a fully discharged state is A in h, and 0.7≦P / (M*Q / A)≦0.99 is satisfied.

[0006] In the above technical solution, P / (M*Q / A)≦0.99, so that the power of all energy storage devices associated with the energy storage converter has a sufficient margin compared to the power of the energy storage converter, eliminating the need for long-term capacity replenishment of the energy storage devices and realizing long-term reliability of the energy storage devices; and P / (M*Q / A)≧0.7, so that the power of the energy storage devices does not have too much margin compared to the power of the energy storage converter, reducing power waste and improving the economic efficiency of the energy storage devices. Thus, from the perspective of long-term reliability and economic efficiency of the energy storage devices, the power matching between the energy storage devices and the energy storage converter is improved.

[0007] In some embodiments, 0.75≦P / (M*Q / A)≦0.95. By achieving both long-term reliability and economic viability of the energy storage device, the cost of the energy storage device can be controlled to a relatively low level, and the capacity replenishment period of the energy storage device can also be extended.

[0008] In some embodiments, 0.85≦P / (M*Q / A)≦0.93.

[0009] In some embodiments, the energy storage device includes a housing and at least one battery, the housing including a battery compartment, the at least one battery housed in the battery compartment, the battery including at least one battery cell, the capacity of the battery cell being C in Ah, the plateau voltage of the battery cell being U0 in V, the number of battery cells in the battery compartment being N, and Q=N*C*U0. In this way, all battery cells in the battery compartment can have the same capacity and battery cells with the same specifications can be selected. This is advantageous for improving the assembly efficiency of the energy storage device while reducing the possibility of wasting space due to different specifications of battery cells in the battery compartment.

[0010] In some embodiments, the battery chamber houses N1 batteries. The N1 batteries are formed from X1 first battery sets connected in parallel, and each first battery set is formed by connecting Y1 batteries in series. Alternatively, the N1 batteries are formed from Y1 second battery sets connected in series, and each second battery set is formed by connecting X1 batteries in parallel, where N1≥1, X1≥1, Y1≥1, and N1 = X1 * Y1. Each battery includes N2 battery cells. The N2 battery cells are formed from X2 first battery cell groups connected in parallel, and each first battery cell group is formed by connecting Y2 battery cells in series. Alternatively, the N2 battery cells are formed from Y2 second battery cell groups connected in series, and each second battery cell group is formed by connecting X2 battery cells in parallel, where N2≥1, X2≥1, Y2≥1, N2 = X2 * Y2, and N = N1 * N2. For the N1 batteries in the battery chamber, Y1 batteries may be first connected in series to form a first battery set, and then X1 first battery sets may be connected in parallel. Alternatively, X1 batteries may be first connected in parallel to form a second battery set, and then Y1 second battery sets may be connected in series. For the N2 battery cells in the battery, Y2 battery cells may be first connected in series to form a first battery cell group, and then X2 first battery cell groups may be connected in parallel. Alternatively, X2 battery cells may be connected in parallel to form a second battery cell group, and then Y2 second battery cell groups may be connected in series. To adjust the voltage of the energy storage device within a reasonable range, the number of series-connected batteries Y1 in the battery chamber and the number of series-connected battery cells Y2 in the battery may be set according to demand.

[0011] In some embodiments, when charging the energy storage device, the maximum operating voltage on the DC side of the energy storage converter is U1, and the minimum operating voltage on the DC side of the energy storage converter is U2, where U2 < U0 * Y1 * Y2 < U1. The voltage of the energy storage device can be matched with the voltage of the energy storage converter, enabling an external device to charge the energy storage device via the energy storage converter and enabling the energy storage device to supply power to an external device via the energy storage converter.

[0012] In some embodiments, the positive electrode material of the battery cell includes a lithium-containing phosphate, and 2.8V≦U0≦3.6V, and 250≦Y1*Y2≦468. In this way, when the positive electrode material of the battery cell includes a lithium-containing phosphate, the voltage of the energy storage converter can be controlled within a reasonable range, and the voltage of the energy storage device can be prevented from being too low, making the energy storage device compatible with energy storage converters having relatively high operating voltages, and also preventing the voltage of the energy storage device from being too high, thereby reducing the requirements for the operating voltage of the energy storage converter and reducing production costs.

[0013] In some embodiments, the positive electrode material of the battery cell includes lithium iron phosphate, and 3.1 V≦U0≦3.3 V, and 400≦Y1*Y2≦424. Thus, when the positive electrode material of the battery cell includes lithium iron phosphate, the voltage of the energy storage converter can be controlled within a reasonable range.

[0014] In some embodiments, 3.5*10 6 W≦P≦7.5*10 6 W, M=A, 1≦X1*X2≦18. The positive electrode material of the battery cell contains lithium-containing phosphate, and 3.5*10 6 W≦P≦7.5*10 6 When W and M=A, X1*X2 can be set within the range of 1 to 18 to control the capacity of the battery cell within a reasonable range.

[0015] In some embodiments, X1=1.

[0016] In some embodiments, X2=1, and 2000Ah≦C≦11000Ah. When the positive electrode material of the battery cell includes lithium-containing phosphate, and the number of parallel connections of the batteries in the battery compartment X1 and the number of parallel connections of the battery cells in the battery X2 are both 1, setting the capacity of the battery cell within the range of 2000Ah to 11000Ah can not only meet the power consistency requirement of the energy storage device, but also meet the voltage requirement of the energy storage device.

[0017] In some embodiments, 2500 Ah < C < 6000 Ah.

[0018] In some embodiments, X2=2, and 1000Ah≦C≦5500Ah. When the positive electrode material of the battery cell includes lithium-containing phosphate, the number of parallel-connected batteries in the battery compartment X1 is 1, and the number of parallel-connected battery cells in the battery X2 is 2, setting the capacity of the battery cell within the range of 1000Ah to 5500Ah can not only meet the power consistency requirement of the energy storage device, but also meet the voltage requirement of the energy storage device.

[0019] In some embodiments, 2000 Ah < C < 4000 Ah.

[0020] In some embodiments, 2≦X1≦6. In this way, by controlling the number X1 of parallel-connected batteries in the battery chamber within a reasonable range, the capacity of the battery cell is prevented from becoming too large, which not only reduces the difficulty and cost of manufacturing the battery cells but also prevents the number X1 of parallel-connected batteries in the battery chamber from becoming too large, which is advantageous for improving the space utilization rate of the battery chamber.

[0021] In some embodiments, X1=4, X2=1, and 500Ah≦C≦2600Ah. When the positive electrode material of the battery cell includes lithium-containing phosphate, and X1=4, X2=1, setting the capacity of the battery cell within the range of 500Ah to 2600Ah can satisfy not only the power consistency requirement of the energy storage device but also the voltage requirement of the energy storage device.

[0022] In some embodiments, 800 Ah < C < 1500 Ah.

[0023] In some embodiments, X1=4, X2=2, and 250Ah≦C≦1300Ah. When the positive electrode material of the battery cell includes lithium-containing phosphate, and X1=4, X2=2, the capacity of the battery cell is set to be in the range of 800Ah to 1500Ah, which not only satisfies the power consistency requirement of the energy storage device but also satisfies the voltage requirement of the energy storage device.

[0024] In some embodiments, 350 Ah < C < 1000 Ah.

[0025] In some embodiments, 500 Ah < C < 700 Ah.

[0026] In some embodiments, the X1 first assembled batteries are arranged along the longitudinal direction of the housing. When the positive electrode material of the battery cells includes lithium-containing phosphate and 2≦X1≦6, arranging the X1 first assembled batteries connected in parallel in the battery chamber along the longitudinal direction of the housing can fully utilize the space in the battery chamber along the longitudinal direction of the housing, resulting in a rational layout and favorable improvement in the space utilization rate of the battery chamber.

[0027] In some embodiments, the battery chamber includes a plurality of sub-chambers arranged along the longitudinal direction of the housing, each sub-chamber housing one first assembled battery. By dividing the battery chamber into the plurality of sub-chambers, each sub-chamber can house one first assembled battery, allowing the first assembled batteries to be housed more regularly within the battery chamber and making it easier to install the batteries in the first assembled battery.

[0028] In some embodiments, the positive electrode material of the battery cell comprises a lithium transition metal oxide, and 2.8V≦U0≦4.35V, 210≦Y1*Y2≦530. In this way, when the positive electrode material of the battery cell comprises a lithium transition metal oxide, the voltage of the energy storage converter can be controlled within a reasonable range, and the voltage of the energy storage device can be prevented from being too low, making the energy storage device compatible with energy storage converters having relatively high operating voltages, and also preventing the voltage of the energy storage device from being too high, thereby reducing the requirements for the operating voltage of the energy storage converter and reducing production costs.

[0029] In some embodiments, 3.5*10 6 W≦P≦7.5*10 6 W, M=A, 1≦X1*X2≦18. The positive electrode material of the battery cell contains lithium transition metal oxide, and 3.5*10 6 W≦P≦7.5*10 6 When W and M=A, X1*X2 can be set within the range of 1 to 18 to control the capacity of the battery cell within a reasonable range.

[0030] In some embodiments, X1=1.

[0031] In some embodiments, X2=1, and 1500Ah≦C≦13400Ah. When the positive electrode material of the battery cell includes lithium transition metal oxide, and the number X1 of parallel-connected batteries in the battery compartment and the number X2 of parallel-connected battery cells in the battery are both 1, setting the capacity of the battery cell within the range of 1500Ah to 13400Ah can not only meet the power consistency requirement of the energy storage device, but also meet the voltage requirement of the energy storage device.

[0032] In some embodiments, 3000 Ah≦C≦7000 Ah.

[0033] In some embodiments, X2=2, and 750Ah≦C≦6670Ah. When the positive electrode material of the battery cell includes lithium transition metal oxide, the number of parallel-connected batteries in the battery compartment X1 is 1, and the number of parallel-connected battery cells in the battery compartment X2 is 2, setting the capacity of the battery cell within the range of 750Ah to 6670Ah can not only meet the power consistency requirement of the energy storage device, but also meet the voltage requirement of the energy storage device.

[0034] In some embodiments, 1800 Ah < C < 4000 Ah.

[0035] In some embodiments, 2≦X1≦6. In this way, by controlling the number X1 of parallel-connected batteries in the battery chamber within a reasonable range, the capacity of the battery cell is prevented from becoming too large, which not only reduces the difficulty and cost of manufacturing the battery cells but also prevents the number X1 of parallel-connected batteries in the battery chamber from becoming too large, which is advantageous for improving the space utilization rate of the battery chamber.

[0036] In some embodiments, X1=4, X2=1, and 375Ah≦C≦3300Ah. When the positive electrode material of the battery cell includes a lithium transition metal oxide, and X1=4, X2=1, the capacity of the battery cell can be set within the range of 375Ah to 3300Ah to meet not only the power consistency requirement of the energy storage device but also the voltage requirement of the energy storage device.

[0037] In some embodiments, 700 Ah < C < 1600 Ah.

[0038] In some embodiments, X1=4, X2=2, and 200Ah≦C≦1600Ah. When the positive electrode material of the battery cell includes a lithium transition metal oxide, and X1=4, X2=2, setting the capacity of the battery cell within the range of 200Ah to 1600Ah can satisfy not only the power consistency requirement of the energy storage device but also the voltage requirement of the energy storage device.

[0039] In some embodiments, 340 Ah < C < 1050 Ah.

[0040] In some embodiments, 490 Ah < C < 720 Ah.

[0041] In some embodiments, the X1 first assembled batteries are arranged along the longitudinal direction of the housing. When the positive electrode material of the battery cells includes a lithium transition metal oxide and 2≦X1≦6, arranging the X1 first assembled batteries connected in parallel in the battery chamber along the longitudinal direction of the housing can fully utilize the space in the battery chamber along the longitudinal direction of the housing, resulting in a rational layout and favorable improvement in the space utilization rate of the battery chamber.

[0042] In some embodiments, the battery chamber includes a plurality of sub-chambers arranged along the longitudinal direction of the housing, each sub-chamber housing one first assembled battery. By dividing the battery chamber into the plurality of sub-chambers, each sub-chamber can house one first assembled battery, allowing the first assembled batteries to be housed more regularly within the battery chamber and making it easier to install the batteries in the first assembled battery.

[0043] In some embodiments, the battery cells are sodium-ion battery cells, and 1.5V≦U0≦4V, 230≦Y1*Y2≦1000. In this way, when the battery cells are sodium-ion battery cells, the voltage of the energy storage converter can be controlled within a reasonable range, and the voltage of the energy storage device is not too low, which not only allows the energy storage device to be adapted to an energy storage converter with a relatively high operating voltage, but also prevents the voltage of the energy storage device from being too high, reducing the requirements for the operating voltage of the energy storage converter and reducing production costs.

[0044] In some embodiments, 3.5*10 6 W≦P≦7.5*10 6 W, M=A, 1≦X1*X2≦18. The battery cell is a sodium ion battery cell, 3.5*10 6W≦P≦7.5*10 6 When W and M=A, X1*X2 can be set within the range of 1 to 18 to control the capacity of the battery cell within a reasonable range.

[0045] In some embodiments, X1=1.

[0046] In some embodiments, X2=1, 1200Ah≦C≦18000Ah. When the battery cells are sodium-ion battery cells, and the number X1 of parallel-connected batteries in the battery compartment and the number X2 of parallel-connected battery cells in the battery compartment are both 1, setting the capacity of the battery cells within the range of 1200Ah to 18000Ah can not only meet the power consistency requirement of the energy storage device, but also meet the voltage requirement of the energy storage device.

[0047] In some embodiments, 2000 Ah≦C≦10000 Ah.

[0048] In some embodiments, X2=2, and 600Ah≦C≦9000Ah. When the battery cells are sodium-ion battery cells, the parallel connection number X1 of the batteries in the battery compartment is 1, and the parallel connection number X2 of the battery cells in the battery compartment is 2, setting the capacity of the battery cells within the range of 600Ah to 9000Ah can not only meet the power consistency requirement of the energy storage device, but also meet the voltage requirement of the energy storage device.

[0049] In some embodiments, 1600 Ah≦C≦4000 Ah.

[0050] In some embodiments, 2≦X1≦6. In this way, by controlling the number X1 of parallel-connected batteries in the battery chamber within a reasonable range, the capacity of the battery cell is prevented from becoming too large, which not only reduces the difficulty and cost of manufacturing the battery cells but also prevents the number X1 of parallel-connected batteries in the battery chamber from becoming too large, which is advantageous for improving the space utilization rate of the battery chamber.

[0051] In some embodiments, X1=4, X2=1, and 300Ah≦C≦4000Ah. When the battery cells are sodium-ion battery cells, and X1=4, X2=1, setting the capacity of the battery cells within the range of 300Ah to 4000Ah can not only meet the power consistency requirement of the energy storage device, but also meet the voltage requirement of the energy storage device.

[0052] In some embodiments, 700 Ah < C < 1500 Ah.

[0053] In some embodiments, X1=4, X2=2, and 150Ah≦C≦1500Ah. When the battery cells are sodium-ion battery cells, and X1=4, X2=2, setting the capacity of the battery cells within the range of 150Ah to 1500Ah not only meets the power consistency requirement of the energy storage device, but also meets the voltage requirement of the energy storage device.

[0054] In some embodiments, 350 Ah < C < 1200 Ah.

[0055] In some embodiments, 400 Ah < C < 650 Ah.

[0056] In some embodiments, the X1 first assembled batteries are arranged along the longitudinal direction of the housing. When the battery cells are sodium ion battery cells and 2≦X1≦6, arranging the X1 first assembled batteries connected in parallel in the battery chamber along the longitudinal direction of the housing makes full use of the space in the battery chamber along the longitudinal direction of the housing, resulting in a rational layout and advantageously improving the space utilization rate of the battery chamber.

[0057] In some embodiments, the battery chamber includes a plurality of sub-chambers arranged along the longitudinal direction of the housing, each sub-chamber housing one first assembled battery. By dividing the battery chamber into the plurality of sub-chambers, each sub-chamber can house one first assembled battery, allowing the first assembled batteries to be housed more regularly within the battery chamber and making it easier to install the batteries in the first assembled battery.

[0058] In some embodiments, the battery chamber accommodates only one first assembled battery along the height direction of the housing, and Y1 batteries in each first assembled battery are arranged along the height direction of the housing, with 2≦Y1≦10. All batteries in the first assembled battery are arranged along the height direction of the housing, which is advantageous for realizing series connection of all batteries in the first assembled battery. By setting Y1 between 2 and 10, Y1 is not set to be too large. This is advantageous for improving the space utilization rate of the battery chamber, as the number of batteries arranged along the height direction of the housing within the battery chamber is not too large.

[0059] In some embodiments, a battery cell includes a housing and at least one electrode assembly, the electrode assembly being accommodated in the housing, the housing having a rectangular parallelepiped shape, a size of the housing in a first direction being W1, a size of the housing in a second direction being T1, a 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 of the first direction, the second direction, and the third direction being parallel to a width direction of the housing, and the other wall 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 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 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 90% or more, which makes the occupancy rate of the internal space of the housing relatively large, increases the space available for the housing to accommodate the electrode assembly, and can improve the volumetric energy density of the battery cell under the same chemical system.

[0060] In some embodiments, (W1-a) / W1≧97.0%, (T1-b) / T1≧96.5%, and (K1-c) / K1≧96.5%, thereby improving the size ratios of the housing's internal space in the three directions and further improving the volumetric energy density of the battery cell.

[0061] In some embodiments, the housing includes a case and end caps, the case has an opening, 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 terminals may be attached to the end caps 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 into the housing and the difficulty of attaching the electrode terminals to the housing.

[0062] 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)≧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.

[0063] 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)≧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.

[0064] 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.

[0065] 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, 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.

[0066] 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)≧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.

[0067] 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)≧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.

[0068] 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.

[0069] In some embodiments, 3000 cm 3 ≦W1*T1*K1≦40000cm 3 W1*T1*K1≧3000cm 3 When the ratio of the volume of the inner space of the housing to the volume of the housing is 90% or more, the structural strength requirements of the housing can be met by ensuring that the wall thickness of the housing is not too small, and W1*T1*K1≦40000cm 3 In this case, the capacity and current of the battery cell can be controlled within an appropriate range, thereby reducing the risk of damage to overcurrent elements in the circuit.

[0070] In some embodiments, 3200 cm 3 ≦W1*T1*K1≦32000cm 3 This achieves both the structural strength of the housing and the heat dissipation requirements of the battery cells, further improving the structural strength of the housing and reducing the risk of damage to overcurrent elements in the circuit.

[0071] In some embodiments, 3720 cm 3 ≦W1*T1*K1≦12500cm 3 is.

[0072] In some embodiments, 4000 cm 3 ≦W1*T1*K1≦6000cm 3 is.

[0073] In some embodiments, the positive electrode material of the battery cell includes a lithium-containing phosphate, and satisfies 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 in achieving a ratio of the volume of the internal space of the battery cell housing to the volume of the housing of 90% or greater.

[0074] In some embodiments, the positive electrode material of the battery cell includes a lithium transition metal oxide, and satisfies 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, which is advantageous in achieving a ratio of the volume of the internal space of the battery cell housing to the volume of the housing of 90% or greater.

[0075] In some embodiments, the battery cells are sodium-ion battery cells, and satisfy 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 in achieving a ratio of the volume of the battery cell's internal space to the housing's volume of 90% or greater.

[0076] According to a second aspect, an embodiment of the present application provides an energy storage system, the energy storage system including an energy storage converter and M energy storage devices according to any one of the embodiments of the first aspect, the energy storage devices being electrically connected to the energy storage converter.

[0077] In some embodiments, M=2 and A=2, or M=4 and A=4, or M=8 and A=8. [Brief explanation of the drawings]

[0078] In order to more clearly explain the technical solutions of the embodiments of the present application, the following briefly introduces the drawings that need to be 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 schematic block diagram of an energy storage system according to some embodiments of the present application. [Figure 2] FIG. 1 is a perspective view of an energy storage device according to some embodiments of the present application. [Figure 3] 1 is a structural schematic diagram of an energy storage device according to some embodiments of the present application. [Figure 4] FIG. 4 is a structural schematic diagram of the housing shown in FIG. 3. [Figure 5] 5 is a cross-sectional view of the housing shown in FIG. 4 along the line AA. [Figure 6] FIG. 4 is an exploded view of the battery shown in FIG. [Figure 7] FIG. 7 is an exploded view of the battery cell shown in FIG. [Figure 8] FIG. 4 is a diagram showing the arrangement of batteries in the battery chamber shown in FIG. 3. [Figure 9] 10A and 10B are diagrams illustrating the arrangement of batteries within a battery compartment according to some other embodiments of the present application. [Figure 10] 1 is a structural schematic diagram of a battery according to some embodiments of the present application. [Figure 11] 1 is a structural schematic diagram of a battery according to some other embodiments of the present application. [Figure 12] 1 is a structural schematic diagram of an energy storage device according to some other embodiments of the present application. [Figure 13] FIG. 13 is a structural schematic diagram of the housing shown in FIG. [Figure 14] 13 is a cross-sectional view of the energy storage device shown in FIG. 12 . [Figure 15] FIG. 1 is a perspective view of a battery cell according to some embodiments of the present application. [Figure 16] FIG. 16 is an exploded view of the battery cell shown in FIG. [Figure 17] 16 is an exploded cross-sectional view of the battery cell shown in FIG. 15 taken along a UW plane. [Figure 18] 16 is an exploded cross-sectional view of the battery cell shown in FIG. 15 taken along a VW plane. [Figure 19] FIG. 2 is a perspective view of a battery cell according to some further embodiments of the present application. [Figure 20] FIG. 20 is an exploded view of the battery cell shown in FIG. [Figure 21] FIG. 20 is an exploded cross-sectional view of the battery cell shown in FIG. 19 taken along a UW plane. [Figure 22] FIG. 20 is an exploded cross-sectional view of the battery cell shown in FIG. 19 taken along a VW plane. DETAILED DESCRIPTION OF THE INVENTION

[0079] 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.

[0080] 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 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 drawings are not intended to describe a specific order or a hierarchical relationship, but are intended to distinguish different objects.

[0081] 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.

[0082] In the description of this 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 this application according to specific circumstances.

[0083] 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.

[0084] 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.

[0085] The term "plurality" as used herein refers to two or more (including two).

[0086] 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.

[0087] 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.

[0088] 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.

[0089] In some embodiments, the positive electrode may be a positive plate, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0090] For example, a positive electrode current collector has two surfaces that face each other in the thickness direction of the positive electrode current collector, and a positive electrode active material is disposed on either one or both of the two facing surfaces of the positive electrode current collector.

[0091] 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).

[0092] 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.

[0093] In some examples, the negative electrode may be a negative electrode plate, and the negative electrode plate may include a negative electrode current collector.

[0094] 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).

[0095] 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.

[0096] 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.

[0097] 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 usable as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination.

[0098] 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.

[0099] In some embodiments, the electrode assembly is a wound structure.

[0100] In some embodiments, the electrode assembly is a laminate structure.

[0101] The energy storage device 10 is a device that integrates multiple battery cells 21 in a housing 1, and the multiple battery cells 21 are connected in series, parallel, or series-parallel to store electrical energy. The energy storage device 10 may be used in a power system to store surplus electrical energy during periods of low power consumption and to supplement power consumption during periods of peak power consumption.

[0102] An energy storage device 10 typically needs to be connected to an energy storage converter 20. An external device (e.g., a power grid) can convert electrical energy from AC power to DC power through the energy storage converter 20 and store it in the energy storage device 10 to charge the energy storage device 10. The energy storage device 10 can also convert electrical energy from DC to AC through the energy storage converter 20 to power an external device and discharge the energy storage device 10. A typical energy storage device 10 does not consider the matching issue between the energy storage device 10 and the energy storage converter 20, and does not have a sufficient power margin. Therefore, after a relatively short period of use, the energy storage device 10 needs to be replenished. For example, several battery cells 21 are added to the original energy storage device 10 to achieve the purpose of replenishment. The power matching between such an energy storage device 10 and the energy storage converter 20 is poor.

[0103] In view of this, an embodiment of the present application provides an energy storage device 10 used to electrically connect an energy storage converter 20, the energy storage converter 20 being usable to cooperate with M energy storage devices 10, where M is a positive integer, the rated output power of the energy storage converter 20 is P in W, the energy of the energy storage device 10 is Q in Wh, the time length for the energy storage device 10 to discharge from a fully charged state to a fully discharged state is A in h, and P / (M*Q / A) is set within a range of 0.7 to 0.99. In this way, by achieving both long-term reliability and economic efficiency of the energy storage device 10, the power matching between the energy storage device 10 and the energy storage converter 20 is improved.

[0104] The energy storage device 10 described in the embodiments of the present application is applied to an energy storage system 100 .

[0105] 1, which is a schematic block diagram of an energy storage system 100 according to some embodiments of the present application. The energy storage system 100 may include an energy storage device 10 and an energy storage converter 20 (PCS, Power Conversion System), where the energy storage device 10 is electrically connected to the energy storage converter 20.

[0106] The energy storage converter 20 is a device that connects an external device to the energy storage device 10, and the external device may be a power grid, a power consuming device, etc. The energy storage converter 20 has a DC side and an AC side, and the DC side is used for electrical connection with the energy storage device 10, and the AC side is used for connection with the external device.

[0107] When the energy storage device 10 is in a charging state, the energy storage converter 20 functions as a rectifier to convert electrical energy from AC power on the AC side to DC power and store it in the energy storage device 10, and when the energy storage device 10 is in a discharging state, the energy storage converter 20 functions as an inverter to convert the electrical energy stored in the energy storage device 10 from DC power on the DC side to AC power and transport it to an external device.

[0108] In the energy storage system 100, one energy storage converter 20 may be provided with one corresponding energy storage device 10, or multiple corresponding energy storage devices 10. In an embodiment in which multiple energy storage devices 10 are provided with one energy storage converter 20, the number of energy storage devices 10 may be two, three, four, five, six, seven, eight, or more. For example, in FIG. 1 , one energy storage converter 20 is electrically connected to four corresponding energy storage devices 10.

[0109] The specific structure of the energy storage device 10 according to the embodiment of the present application will be described in detail in conjunction with the following drawings.

[0110] Referring to FIG. 2, FIG. 2 is a perspective view of an energy storage device 10 according to some embodiments of the present application, the embodiments of the present application being used to provide an energy storage device 10 and electrically connect an energy storage converter 20, the energy storage converter 20 being usable to cooperate with M energy storage devices 10, M being a positive integer, the rated output power of the energy storage converter 20 being P in W, the energy of the energy storage device 10 being Q in Wh, the time length for the energy storage device 10 to discharge from a fully charged state to a fully discharged state being A in h, and satisfying 0.7≦P / (M*Q / A)≦0.99.

[0111] Here, the rated output power of the energy storage converter 20 is the rated output power of the AC side of the energy storage converter 20. The rated output power of the energy storage converter 20 is represented by P, its unit is "watt", called "Watt", and its symbol is "W". The energy of the energy storage device 10 is represented by Q, its unit is "watt-hour", and its symbol is "Wh". The length of time it takes for the energy storage device 10 to discharge from a fully charged state to a fully discharged state is represented by A, its unit is "hour", and its symbol is "h".

[0112] As can be seen, when the energy storage device 10 is fully charged, the energy storage device 10 is in a fully charged state, and when the amount of power in the energy storage device 10 is completely discharged, the energy storage device 10 is in a fully discharged state. The length of time it takes for the energy storage device 10 to be discharged from the fully charged state to the fully discharged state via the energy storage converter 20 is represented by A, which has the unit "hours" and the symbol "h".

[0113] M can be 1, 2, 3, 4, 5, 6, 7, 8, etc. M can be equal to A, M can be greater than A, or M can be less than A.

[0114] M*Q represents the total energy of the M energy storage devices 10 cooperating with the energy storage converter 20, and M*Q / A represents the power of the M energy storage devices 10 cooperating with the energy storage converter 20.

[0115] P / (M*Q / A) may be any one of the point values ​​0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, etc., or a range value between any two of them.

[0116] In the embodiment of the present application, P / (M*Q / A)≦0.99, whereby the power of all energy storage devices 10 cooperating with the energy storage converter 20 has a sufficient margin compared to the power of the energy storage converter 20, eliminating the need for capacity replenishment of the energy storage devices 10 over long periods of time and achieving long-term reliability of the energy storage devices 10, and P / (M*Q / A)≧0.7, whereby the power of the energy storage devices 10 does not have too much margin compared to the power of the energy storage converter 20, reducing power waste and improving the economic efficiency of the energy storage devices 10. Thus, when considered from the perspectives of the long-term reliability and economic efficiency of the energy storage devices 10, the power matching between the energy storage devices 10 and the energy storage converter 20 is improved.

[0117] A specific explanation will be given below using experimental data.

[0118] [Table 1]

[0119] Based on Table 1 above, and comparing Examples 1 to 9 with Comparative Example 1, it can be seen that when P / (M*Q / A)≦0.99, the cycle for replenishment of the capacity of the energy storage device 10 is relatively long, and there is no need to replenish the capacity of the energy storage device 10 within a short period of time, thereby achieving long-term reliability of the energy storage device 10.

[0120] In some embodiments, 0.75≦P / (M*Q / A)≦0.95.

[0121] In this embodiment, P / (M*Q / A) may be any one of the point values ​​0.75, 0.78, 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, etc., or a range value between any two of them.

[0122] In this embodiment, 0.75≦P / (M*Q / A)≦0.95, and by achieving both long-term reliability and economic efficiency of the energy storage device 10, the cost of the energy storage device 10 can be controlled to a relatively low level, and the capacity replenishment cycle of the energy storage device 10 can also be extended.

[0123] In some embodiments, 0.85≦P / (M*Q / A)≦0.93.

[0124] In this embodiment, P / (M*Q / A) may be any one of the 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 them.

[0125] In this embodiment, 0.85≦P / (M*Q / A)≦0.93, and by achieving both long-term reliability and economic efficiency of the energy storage device 10, the cost of the energy storage device 10 can be further controlled to a relatively low level, and the capacity replenishment cycle of the energy storage device 10 can also be further extended.

[0126] 3 to 6, in some embodiments, FIG. 3 is a structural schematic diagram of an energy storage device 10 according to some embodiments of the present application, FIG. 4 is a structural schematic diagram of a housing 1 shown in FIG. 3, FIG. 5 is an AA cross-sectional view of the housing 1 shown in FIG. 4, and FIG. 6 is an exploded view of a battery 2 shown in FIG. 3. The energy storage device 10 includes a housing 1 and at least one battery 2, the housing 1 includes a battery chamber 11, the at least one battery 2 is accommodated in the battery chamber 11, and the battery 2 includes at least one battery cell 21. The capacity of the battery cell 21 is C in Ah, the plateau voltage of the battery cell 21 is U0 in V, the number of battery cells 21 in the battery chamber 11 is N, and Q=N*C*U0.

[0127] The capacity of the battery cell 21 is represented by C, its unit is "ampere-hours" and its symbol is "Ah." The plateau voltage of the battery cell 21 is represented by U0, its unit is "volts" and its symbol is "Volt." The plateau voltage is the voltage value corresponding to when the voltage change of the battery cell 21 is smallest but the capacity change is relatively large.

[0128] 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 also be called a container, and the energy storage device 10 may also be called an energy storage container. The housing 1 may have various shapes, for example, a cylindrical shape or a prismatic shape. For example, in FIG. 3, the housing 1 has a rectangular prism shape, and specifically, the housing 1 has a rectangular prism shape.

[0129] The battery chamber 11 is a space inside the housing 1 for accommodating the battery 2. The battery chamber 11 may accommodate only the battery 2, or may accommodate components other than the battery 2, such as fire-fighting components. The fire-fighting components may include piping, a detector, etc. The battery chamber 11 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, etc. For example, in FIGS. 3 to 5, the battery chamber 11 is shaped like a square prism, and specifically, the battery 2 is shaped like a rectangular parallelepiped. In the example where the battery chamber 11 is shaped like 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 2 can enter the battery chamber 11 through the opening. A door leaf may be installed on the opening side of the battery chamber 11, and the door leaf and the housing 1 may be connected by a sliding or hinged connection to open and close the opening by sliding or rotating.

[0130] The housing 1 may have only the battery chamber 11, or may have spaces for accommodating other components in addition to the battery chamber 11. For example, the housing 1 may further include a thermal management chamber 12 and a main control chamber 13. The thermal management chamber 12 may accommodate a water-cooling unit, which is used to provide a fluid medium to the thermal management element, and the thermal management element may be a water-cooled plate installed in the battery chamber 11 to manage the temperature of the battery cells 21. The main control chamber 13 may accommodate a main control unit, which is used for high-voltage control and communication of the multiple battery cells 21 in the battery chamber 11. Here, the housing 1 has a rectangular parallelepiped shape, and the battery chamber 11 and the main control chamber 13 are arranged along the height direction Z of the housing. The thermal management chamber 12 may be located on one side of the battery chamber 11 along the longitudinal direction X of the housing, and the main control chamber 13 may be located at the bottom of the battery chamber 11 along the height direction Z of the housing. In another embodiment, the housing 1 may further include an electrical compartment 14, which may be used to house a busbar unit, a power distribution unit, and a control unit. The busbar unit is used to realize busbars for the multiple batteries 2 and to realize a safe connection between the multiple batteries 2 and the DC side of the energy storage converter 20. 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 21 management unit, a fire control unit, etc. to detect and manage the inside of the energy storage device 10. The electrical compartment 14 and the thermal management compartment 12 may be generally located on one side of the battery compartment 11 along the longitudinal direction X of the housing, and the electrical compartment 14 and the thermal management compartment 12 are arranged along the width direction Y of the housing.

[0131] The battery compartment 11 may contain one or more batteries 2, and the battery 2 may contain one or more battery cells 21. The batteries 2 in the battery compartment 11 may be connected in series, parallel, or series-parallel, and the battery cells 21 in the battery 2 may also be connected in series, parallel, or series-parallel, with series-parallel connection meaning that both series and parallel connections exist.

[0132] As can be seen, if the battery cells 21 in each battery 2 are equal, the number N of battery cells 21 in the battery compartment 11 is equal to the number of batteries 2 in the battery compartment 11 multiplied by the number of battery cells 21 in the battery 2. If there is one battery 2 in the battery compartment 11, one battery cell 21 in the battery 2, and the battery compartment 11 contains only one battery cell 21, then N=1.

[0133] 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 1, the battery chamber 11 may accommodate one battery 2 or multiple batteries 2. The battery 2 may be rectangular, and after being accommodated in the battery chamber 11, one of the longitudinal direction, width direction, and height direction of the battery 2 may be parallel to the longitudinal direction X of the housing, the other may be parallel to the width direction Y of the housing, and the remaining other may be parallel to the height direction Z of the housing. For example, in the embodiment shown in FIG. 3, the battery chamber 11 accommodates multiple batteries 2 along the longitudinal direction X of the housing, the battery chamber 11 accommodates multiple batteries 2 along the height direction Z of the housing, and the battery chamber 11 accommodates only one battery 2 along the width direction Y of the housing, with the longitudinal direction of the battery 2 parallel to the width direction Y of the housing, the width direction of the battery 2 parallel to the longitudinal direction X of the housing, and the height direction of the battery 2 parallel to the height direction Z of the housing.

[0134] In this embodiment, Q=N*C*U0, and all the battery cells 21 in the battery compartment 11 can have the same capacity and can select battery cells 21 with the same specifications. This is advantageous for improving the assembly efficiency of the energy storage device 10, and also reduces the possibility of space being wasted in the battery compartment 11 due to different specifications of the battery cells 21.

[0135] In some embodiments, the battery 2 may be a battery module, for example, the battery 2 may include a plurality of battery cells 21 arranged and fixed to form a battery module. In the battery module, two side plates and two end plates may form a housing, and the battery cells 21 are fixed within the housing to form the battery module.

[0136] In some other embodiments, as shown in FIG. 6 , the battery 2 may be a battery pack, and the battery 2 may further include a battery box 22, and the battery cells 21 are housed in the battery box 22. If the battery 2 includes a plurality of battery cells 21, the plurality of battery cells 21 may be arranged in an array in the battery box 22. The battery box 22 may include a first portion 221 and a second portion 222, and the first portion 221 and the second portion 222 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, and the open side of the second portion 222 is fitted onto 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 placed 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.

[0137] In some embodiments, referring to Figure 7, Figure 7 is an exploded view of the battery cell 21 shown in Figure 6. The battery cell 21 may include a housing 211, an electrode assembly 213, and an electrode terminal 212. The electrode terminal 212 is installed in the housing 211, and the electrode terminal 212 is electrically connected to the electrode assembly 213.

[0138] 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.

[0139] 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.

[0140] 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 have a rectangular parallelepiped structure and the end cap 2112 may have a rectangular plate-like structure that fits the housing 211. Alternatively, for example, the case 2111 may have a cylindrical structure 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.

[0141] 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.

[0142] 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.

[0143] For example, as shown in FIG. 7, 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 of the end cap 2112. A positive tab 2131 and a negative tab 2131 are formed on the end of the electrode assembly 213 facing the end cap 2112, and the positive tab 2131 and the negative tab 2131 are electrically connected to the two electrode terminals 212, respectively.

[0144] For example, if the housing 211 of the battery cell 21 is a 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 battery 2 is 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, the other may be parallel to the width direction Y of the housing, and the remaining one may be parallel to the height direction Z of the housing.

[0145] 8 to 10, in some embodiments, Fig. 8 is a diagram of the arrangement of batteries 2 in the battery chamber 11 shown in Fig. 3, Fig. 9 is a diagram of the arrangement of batteries 2 in the battery chamber 11 according to some other embodiments of the present application, Fig. 10 is a structural schematic diagram of a battery 2 according to some embodiments of the present application, and Fig. 11 is a structural schematic diagram of a battery 2 according to some other embodiments of the present application. The battery chamber 11 accommodates N1 batteries 2, and the N1 batteries 2 are formed from X1 first assembled batteries 2a connected in parallel, and each first assembled battery 2a is formed by connecting Y1 batteries 2 in series, or the N1 batteries 2 are formed from Y1 second assembled batteries 2b connected in series, and each second assembled battery 2b is formed by connecting X1 batteries 2 in parallel, satisfying N1≧1, X1≧1, Y1≧1, and N1=X1*Y1. The battery 2 includes N2 battery cells 21, and the N2 battery cells 21 are formed from X2 first battery cell groups 21a connected in parallel, and each first battery cell group 21a is formed by connecting Y2 battery cells 21 in series, or the N2 battery cells 21 are formed from Y2 second battery cell groups 21b connected in series, and each second battery cell group 21b is formed by connecting X2 battery cells 21 in parallel, satisfying N2≧1, X2≧1, Y2≧1, N2=X2*Y2, and N=N1*N2.

[0146] X1 is the number of parallel connections of batteries 2 in the battery chamber 11, and Y1 is the number of series connections of batteries 2 in the battery chamber 11. X2 is the number of parallel connections of battery cells 21 in the battery 2, and Y2 is the number of series connections of battery cells 21 in the battery 2. N1, N2, X2, and Y2 are integers greater than or equal to 1.

[0147] When X1=1, forming N1 batteries 2 from X1 first assembled batteries 2a connected in parallel is equivalent to forming N1 batteries 2 from one first assembled battery 2a, and forming each second assembled battery 2b by connecting X1 batteries 2 in parallel is equivalent to each second assembled battery 2b being formed from one battery 2. When Y1=1, forming each first assembled battery 2a from Y1 batteries 2 connected in series is equivalent to each first assembled battery 2a being formed from one battery 2, and forming N1 batteries 2 from Y1 second assembled batteries 2b connected in series is equivalent to forming N1 batteries 2 from one second assembled battery 2b.

[0148] When X2=1, forming N2 battery cells 21 from X2 first battery cell groups 21a connected in parallel is equivalent to forming N2 battery cells 21 from one first battery cell group 21a, and forming each second battery cell group 21b by connecting X2 battery cells 21 in parallel is equivalent to forming each second battery cell group 21b from one battery cell 21. When Y2=1, forming each first battery cell group 21a by connecting Y2 battery cells 21 in series is equivalent to forming each first battery cell group 21a from one battery cell 21, and forming N2 battery cells 21 from Y2 second battery cell groups 21b connected in series is equivalent to forming N2 battery cells 21 from one second battery cell group 21b.

[0149] 8, N1 batteries 2 are formed from X1 first assembled batteries 2a connected in parallel, and each first assembled battery 2a is formed by connecting Y1 batteries 2 in series. For example, X1=4 and Y1=8.

[0150] 9, N1 batteries 2 are formed from Y1 second assembled batteries 2b connected in series, and each second assembled battery 2b is formed by connecting X1 batteries 2 in parallel. For example, X1=4 and Y1=8.

[0151] 10, the N2 battery cells 21 are formed from X2 first battery cell groups 21a connected in parallel, and each first battery cell group 21a is formed by connecting Y2 battery cells 21 in series. The battery box 22 contains a plurality of battery cells 21, and the plurality of battery cells 21 are distributed in an array, 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. For example, all of the battery cells 21 in every two columns are connected in series to form one first battery cell group 21a. Specifically, the battery cells 21 in the battery box 22 are arranged in 26 rows and 4 columns, where X2 = 2 and Y2 = 52.

[0152] 11 , the N2 battery cells 21 are formed from Y2 second battery cell groups 21b connected in series, and each second battery cell group 21b is formed by connecting X2 battery cells 21 in parallel. The battery box 22 contains a plurality of battery cells 21, and the plurality of battery cells 21 are distributed in an array, with the battery cells 21 in each row installed along the longitudinal direction X of the housing and the battery cells 21 in each column installed along the width direction Y of the housing. For example, every two battery cells 21 in each column are connected in parallel to form one second battery cell group 21b. Specifically, the battery cells 21 in the battery box 22 are arranged in 26 rows and 4 columns, where X2 = 2 and Y2 = 52.

[0153] In this embodiment, for the N1 batteries 2 in the battery chamber 11, Y1 batteries 2 may be first connected in series to form the first battery pack 2a, and then X1 first battery packs 2a may be connected in parallel. Alternatively, X1 batteries 2 may be first connected in parallel to form the second battery pack 2b, and then Y1 second battery packs 2b may be connected in series. For the N2 battery cells 21 in the battery 2, Y2 battery cells 21 may be first connected in series to form the first battery cell group 21a, and then X2 first battery cell groups 21a may be connected in parallel. Alternatively, X2 battery cells 21 may be connected in parallel to form the second battery cell group 21b, and then Y2 second battery cell groups 21b may be connected in series. To adjust the voltage of the energy storage device 10 within a reasonable range, the number of series-connected batteries Y1 in the battery chamber 11 and the number of series-connected battery cells Y2 of the battery 2 may be set according to demand.

[0154] In some embodiments, when charging the energy storage device 10, the maximum operating voltage on the DC side of the energy storage converter 20 is U1, and the minimum operating voltage on the DC side of the energy storage converter 20 is U2, satisfying U2 < U0 * Y1 * Y2 < U1.

[0155] When an external device charges the energy storage device 10 via the energy storage converter 20, the operating voltage on the DC side of the energy storage converter 20 gradually changes according to the charging status of the energy storage device 10. For example, the operating voltage on the DC side of the energy storage converter 20 gradually increases. U1 is the maximum operating voltage when charging the energy storage converter 20, and U2 is the minimum operating voltage when charging the energy storage converter 20.

[0156] Here, U0 * Y1 * Y2 is the voltage of the energy storage device 10.

[0157] In this embodiment, if U0 * Y1 * Y2 < U1, it is possible to realize that the external device charges the energy storage device 10 normally through the energy storage converter 20. If U0 * Y1 * Y2 > U2, it is possible to realize that the energy storage device 10 supplies power to the external device through the energy storage converter 20. Therefore, by controlling U0 * Y1 * Y2 within the range of U2 to U1, not only can it be realized that the external device charges the energy storage device 10 through the energy storage converter 20 by matching the voltage of the energy storage device 10 and the voltage of the energy storage converter 20, but it can also be realized that the energy storage device 10 supplies power to the external device through the energy storage converter 20.

[0158] In some embodiments, the cathode material of the battery cell 21 includes a lithium-containing phosphate, and 2.8V ≤ U0 ≤ 3.6V, 250 ≤ Y1 * Y2 ≤ 468.

[0159] The lithium-containing phosphate includes at least one of lithium iron phosphate (for example, LiFePO4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (for example, 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 thereto.

[0160] In this embodiment, U0 may be any one of the point values such as 2.8V, 2.9V, 3V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, 3.6V, or a range value between any two of them. Y1 * Y2 may be any one of the point values such as 250, 256, 280, 288, 300, 304, 320, 336, 360, 384, 400, 416, 440, 468, or a range value between any two of them.

[0161] In this embodiment, when the positive electrode material of battery cell 21 includes lithium-containing phosphate, 2.8V≦U0≦3.6V, 250≦Y1*Y2≦468, and the voltage of energy storage converter 20 can be controlled within a reasonable range, ensuring that the voltage of energy storage device 10 is not too low. This not only allows energy storage device 10 to be adapted to energy storage converter 20 with a relatively high operating voltage, but also ensures that the voltage of energy storage device 10 is not too high, reducing the requirements for the operating voltage of energy storage converter 20 and reducing production costs.

[0162] In some embodiments, the positive electrode material of battery cell 21 includes lithium iron phosphate, and 3.1V≦U0≦3.3V, 400≦Y1*Y2≦424.

[0163] In this embodiment, U0 may be any one of the point values ​​of 3.1V, 3.13V, 3.15V, 3.18V, 3.2V, 3.23V, 3.25V, 3.28V, 3.3V, etc., or a range value between any two of them. Y1*Y2 may be any one of the point values ​​of 400, 404, 408, 412, 416, 420, 424, etc., or a range value between any two of them.

[0164] In this embodiment, when the positive electrode material of the battery cell 21 includes lithium iron phosphate, 3.1V≦U0≦3.3V, 400≦Y1*Y2≦424, and the voltage of the energy storage converter 20 can be controlled within a reasonable range.

[0165] In some embodiments, 3.5*10 6 W≦P≦7.5*10 6 W, M=A, 1≦X1*X2≦18.

[0166] P is 3.5*10 6 W, 3.75*10 6 W, 4*10 6 W, 4.2*10 6 W, 4.5*10 6 W, 4.9*10 6 W, 5*106 W, 5.2*10 6 W, 5.5*10 6 W, 5.8*10 6 W, 6*10 6 W, 6.2*10 6 W, 6.8*10 6 W, 7*10 6 W, 7.2*10 6 W, 7.5*10 6 It may be any one point value or a range value between any two of W, etc. X1*X2 may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.

[0167] In this embodiment, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, and the 6 W≦P≦7.5*10 6 When W and M=A, X1*X2 can be set within the range of 1 to 18, so that the capacity of the battery cell 21 can be controlled within a reasonable range.

[0168] In some embodiments, X1=1.

[0169] As can be appreciated, in embodiments where multiple batteries 2 are housed within the battery compartment 11, all of the batteries 2 in the battery compartment 11 are connected in series.

[0170] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium-containing phosphate, and X2 can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18.

[0171] In some embodiments, X2=1, and 2000 Ah≦C≦11000 Ah.

[0172] In this embodiment, X1=1 and X2=1, and C may be any one of point values ​​of 2000Ah, 3000Ah, 4000Ah, 5000Ah, 6000Ah, 7000Ah, 8000Ah, 9000Ah, 10000Ah, 11000Ah, etc., or a range value between any two of them.

[0173] In this embodiment, when the positive electrode material of the battery cell 21 contains lithium-containing phosphate, and the number X1 of parallel connections of the batteries 2 in the battery chamber 11 and the number X2 of parallel connections of the battery cells 21 of the battery 2 are both 1, by setting the capacity of the battery cell 21 within the range of 2000 Ah to 11000 Ah, not only can the power consistency requirement of the energy storage device 10 be met, but also the voltage requirement of the energy storage device 10 can be met.

[0174] In some embodiments, 2500 Ah < C < 6000 Ah.

[0175] In this embodiment, X1 = 1 and X2 = 1. C may be any one of the point values ​​of 2500Ah, 2800Ah, 3000Ah, 3300Ah, 3500Ah, 3800Ah, 4000Ah, 4300Ah, 4500Ah, 4800Ah, 5000Ah, 5300Ah, 5500Ah, 5800Ah, 6000Ah, etc., or a range value between any two of them.

[0176] In some embodiments, X2=2, and 1000 Ah≦C≦5500 Ah.

[0177] In this embodiment, X1 = 1 and X2 = 2. C may be any one of the point values ​​of 1000Ah, 1500Ah, 2000Ah, 2500Ah, 3000Ah, 3500Ah, 4000Ah, 4500Ah, 5000Ah, etc., or a range value between any two of them.

[0178] When the positive electrode material of the battery cell 21 includes lithium-containing phosphate, the number X1 of parallel connections of the batteries 2 in the battery chamber 11 is 1, and the number X2 of parallel connections of the battery cells 21 of the battery 2 is 2, by setting the capacity of the battery cell 21 within the range of 1000 Ah to 5500 Ah, not only can the power consistency requirement of the energy storage device 10 be met, but also the voltage requirement of the energy storage device 10 can be met.

[0179] In some embodiments, 2000 Ah < C < 4000 Ah.

[0180] In this embodiment, X1 = 1 and X2 = 2. C may be any one of the point values ​​of 2000Ah, 2100Ah, 2200Ah, 2300Ah, 2400Ah, 2500Ah, 2600Ah, 2700Ah, 2800Ah, 2900Ah, 3000Ah, 3100Ah, 3200Ah, 3300Ah, 3400Ah, 3500Ah, 3600Ah, 3700Ah, 3800Ah, 3900Ah, 4000Ah, etc., or a range value between any two of them.

[0181] In some embodiments, 2≦X1≦6.

[0182] In this embodiment, X1 may be 2, 3, 4, 5, or 6.

[0183] In this embodiment, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, and the number X1 of parallel-connected batteries 2 in the battery chamber 11 is controlled within a reasonable range. If X1≧2, the capacity of the battery cell 21 is not too large, which reduces the difficulty and cost of manufacturing the battery cell 21. If X1≦6, the number X1 of parallel-connected batteries 2 in the battery chamber 11 is not too large, which is advantageous for improving the space utilization rate of the battery chamber 11.

[0184] In some embodiments, X1=4, X2=1, and 500 Ah≦C≦2600 Ah.

[0185] In this embodiment, C may be any one of the point values ​​of 500Ah, 800Ah, 1000Ah, 1300Ah, 1500Ah, 1800Ah, 2000Ah, 2300Ah, 2500Ah, 2600Ah, etc., or a range value between any two of them.

[0186] In this embodiment, when the positive electrode material of the battery cell 21 includes lithium-containing phosphate, and X1=4 and X2=1, the capacity of the battery cell 21 is set within the range of 500 Ah to 2600 Ah, which not only satisfies the power consistency requirement of the energy storage device 10, but also satisfies the voltage requirement of the energy storage device 10.

[0187] In some embodiments, 800 Ah < C < 1500 Ah.

[0188] In this embodiment, X1=4, X2=1, and C may be any one of the point values ​​of 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, etc., or a range value between any two of them.

[0189] In some embodiments, X1=4, X2=2, and 250 Ah≦C≦1300 Ah.

[0190] In this embodiment, C may be any one of the point values ​​of 250Ah, 300Ah, 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, etc., or a range value between any two of them.

[0191] In this embodiment, when the positive electrode material of the battery cell 21 includes lithium-containing phosphate, and X1=4 and X2=2, the capacity of the battery cell 21 is set within the range of 800 Ah to 1500 Ah, which not only satisfies the power consistency requirement of the energy storage device 10, but also satisfies the voltage requirement of the energy storage device 10.

[0192] In some embodiments, 350 Ah < C < 1000 Ah.

[0193] In this embodiment, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, X1=4, X2=2, and C may be any one of 350 Ah, 400 Ah, 450 Ah, 500 Ah, 550 Ah, 600 Ah, 650 Ah, 700 Ah, 750 Ah, 800 Ah, 850 Ah, 900 Ah, 950 Ah, 1000 Ah, etc., or a range value between any two of them.

[0194] In some embodiments, 500 Ah < C < 700 Ah.

[0195] In this embodiment, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, X1=4, X2=2, and C may be any one of the point values ​​of 500 Ah, 530 Ah, 550 Ah, 580 Ah, 588 Ah, 600 Ah, 630 Ah, 650 Ah, 680 Ah, 700 Ah, etc., or a range value between any two of them.

[0196] In some embodiments, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, and 2.8V≦U0≦4.35V, 210≦Y1*Y2≦530.

[0197] 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 Mn0.25 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 0.05 O2) and its modifying compounds, etc.

[0198] In this embodiment, U0 may be any one of the following point values ​​or a range value between any two of 2.8V, 2.9V, 3V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, 3.6V, 3.7V, 3.8V, 3.9V, 4V, 4.1V, 4.2V, 4.3V, 4.35V, etc. Y1*Y2 may be any one of the following point values ​​or a range value between any two of 210, 224, 240, 250, 256, 280, 288, 300, 304, 320, 336, 360, 384, 400, 416, 440, 468, 480, 496, 512, 530, etc.

[0199] In this embodiment, when the positive electrode material of battery cell 21 contains lithium transition metal oxide, 2.8V≦U0≦4.35V, 210≦Y1*Y2≦530, and the voltage of energy storage converter 20 can be controlled within a reasonable range, ensuring that the voltage of energy storage device 10 is not too low. This not only allows energy storage device 10 to be adapted to energy storage converter 20 with a relatively high operating voltage, but also ensures that the voltage of energy storage device 10 is not too high, thereby reducing the requirements for the operating voltage of energy storage converter 20 and reducing production costs.

[0200] In some embodiments, 3.5*10 6 W≦P≦7.5*10 6W, M=A, 1≦X1*X2≦18.

[0201] In this example, P is 3.5*10 6 W, 3.75*10 6 W, 4*10 6 W, 4.2*10 6 W, 4.5*10 6 W, 4.9*10 6 W, 5*10 6 W, 5.2*10 6 W, 5.5*10 6 W, 5.8*10 6 W, 6*10 6 W, 6.2*10 6 W, 6.8*10 6 W, 7*10 6 W, 7.2*10 6 W, 7.5*10 6 It may be any one point value or a range value between any two of W, etc. X1*X2 may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.

[0202] In this embodiment, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, and the 6 W≦P≦7.5*10 6 When W and M=A, X1*X2 can be set within the range of 1 to 18, so that the capacity of the battery cell 21 can be controlled within a reasonable range.

[0203] In some embodiments, X1=1.

[0204] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, and X2 can be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18.

[0205] In some embodiments, X2=1, and 1500 Ah≦C≦13400 Ah.

[0206] In this embodiment, X1=1 and X2=1, and C may be any one of the point values ​​of 1500Ah, 1800Ah, 2000Ah, 3000Ah, 4000Ah, 5000Ah, 6000Ah, 7000Ah, 8000Ah, 9000Ah, 10000Ah, 11000Ah, 12000Ah, 13000Ah, 13400Ah, etc., or a range value between any two of them.

[0207] When the positive electrode material of the battery cell 21 contains lithium transition metal oxide, and the number X1 of parallel connections of the batteries 2 in the battery chamber 11 and the number X2 of parallel connections of the battery cells 21 of the battery 2 are both 1, by setting the capacity of the battery cell 21 within the range of 1500 Ah to 13400 Ah, not only can the power consistency requirement of the energy storage device 10 be met, but also the voltage requirement of the energy storage device 10 can be met.

[0208] In some embodiments, 3000 Ah≦C≦7000 Ah.

[0209] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, and X1 = 1 and X2 = 1. C may be any one of the following point values ​​or a range value between any two of 3000 Ah, 3300 Ah, 3500 Ah, 3800 Ah, 4000 Ah, 4300 Ah, 4500 Ah, 4800 Ah, 5000 Ah, 5300 Ah, 5500 Ah, 5800 Ah, 6000 Ah, 6300 Ah, 6500 Ah, 6800 Ah, 7000 Ah, etc.

[0210] In some embodiments, X2=2, and 750 Ah≦C≦6670 Ah.

[0211] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, and X1 = 1 and X2 = 2. C may be any one of the following point values ​​or a range value between any two of 750 Ah, 850 Ah, 1000 Ah, 1500 Ah, 2000 Ah, 2500 Ah, 3000 Ah, 3500 Ah, 4000 Ah, 4500 Ah, 5000 Ah, 5500 Ah, 6000 Ah, 6500 Ah, 6670 Ah, etc.

[0212] When the positive electrode material of the battery cell 21 includes lithium transition metal oxide, the number X1 of parallel connections of the batteries 2 in the battery chamber 11 is 1, and the number X2 of parallel connections of the battery cells 21 of the battery 2 is 2, by setting the capacity of the battery cell 21 within the range of 750 Ah to 6670 Ah, not only can the power consistency requirement of the energy storage device 10 be met, but also the voltage requirement of the energy storage device 10 can be met.

[0213] In some embodiments, 1800 Ah < C < 4000 Ah.

[0214] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, and X1 = 1 and X2 = 2. C may be any one of the following point values ​​or a range value between any two of 1800 Ah, 1900 Ah, 2000 Ah, 2100 Ah, 2200 Ah, 2300 Ah, 2400 Ah, 2500 Ah, 2600 Ah, 2700 Ah, 2800 Ah, 2900 Ah, 3000 Ah, 3100 Ah, 3200 Ah, 3300 Ah, 3400 Ah, 3500 Ah, 3600 Ah, 3700 Ah, 3800 Ah, 3900 Ah, 4000 Ah, etc.

[0215] In some embodiments, 2≦X1≦6.

[0216] In this embodiment, X1 may be 2, 3, 4, 5, or 6.

[0217] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, and the number X1 of parallel-connected batteries 2 in the battery chamber 11 is controlled within a reasonable range to prevent the capacity of the battery cell 21 from becoming too large, which not only reduces the difficulty and cost of manufacturing the battery cell 21 but also prevents the number X1 of parallel-connected batteries 2 in the battery chamber 11 from becoming too large, which is advantageous for improving the space utilization rate of the battery chamber 11.

[0218] In some embodiments, X1=4, X2=1, and 375 Ah≦C≦3300 Ah.

[0219] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, and C may be any one of the following point values ​​or a range value between any two of 375 Ah, 500 Ah, 800 Ah, 1000 Ah, 1300 Ah, 1500 Ah, 1800 Ah, 2000 Ah, 2300 Ah, 2500 Ah, 2600 Ah, 2800 Ah, 3000 Ah, 3150 Ah, 3300 Ah, etc.

[0220] In this embodiment, when the positive electrode material of the battery cell 21 includes lithium transition metal oxide, and X1=4 and X2=1, the capacity of the battery cell 21 is set within the range of 375 Ah to 3300 Ah, which not only satisfies the power consistency requirement of the energy storage device 10, but also satisfies the voltage requirement of the energy storage device 10.

[0221] In some embodiments, 700 Ah < C < 1600 Ah.

[0222] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, X1=4, X2=1, and C may be any one of 700 Ah, 800 Ah, 900 Ah, 1000 Ah, 1100 Ah, 1200 Ah, 1300 Ah, 1400 Ah, 1500 Ah, 1600 Ah, etc., or a range value between any two of them.

[0223] In some embodiments, X1=4, X2=2, and 200 Ah≦C≦1600 Ah.

[0224] In this embodiment, C may be any one of the point values ​​of 200Ah, 300Ah, 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, 1600Ah, etc., or a range value between any two of them.

[0225] In this embodiment, when the positive electrode material of the battery cell 21 includes lithium transition metal oxide, and X1=4 and X2=2, the capacity of the battery cell 21 is set within the range of 200 Ah to 1600 Ah, which not only satisfies the power consistency requirement of the energy storage device 10, but also satisfies the voltage requirement of the energy storage device 10.

[0226] In some embodiments, 340 Ah < C < 1050 Ah.

[0227] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, X1=4, X2=2, and C may be any one of 340 Ah, 400 Ah, 450 Ah, 500 Ah, 550 Ah, 600 Ah, 650 Ah, 700 Ah, 750 Ah, 800 Ah, 850 Ah, 900 Ah, 950 Ah, 1000 Ah, 1050 Ah, etc., or a range value between any two of them.

[0228] In some embodiments, 490 Ah < C < 720 Ah.

[0229] In this embodiment, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, X1=4, X2=2, and C may be any one of the following values: 490 Ah, 500 Ah, 530 Ah, 550 Ah, 572 Ah, 580 Ah, 600 Ah, 630 Ah, 650 Ah, 680 Ah, 700 Ah, 720 Ah, etc., or a range value between any two of them.

[0230] In some embodiments, the battery cells 21 are sodium-ion battery cells, and 1.5V≦U0≦4V, 230≦Y1*Y2≦1000.

[0231] In this embodiment, U0 may be any one of the point values ​​of 1.5V, 1.6V, 1.7V, 1.8V, 1.9V, 2V, 2.1V, 2.2V, 2.3V, 2.4V, 2.5V, 2.6V, 2.7V, 2.8V, 2.9V, 3V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, 3.6V, 3.7V, 3.8V, 3.9V, 4V, etc., or a range value between any two of them. Y1*Y2 may be any one of the following point values ​​or a range value between any two of 230, 240, 250, 256, 280, 288, 300, 304, 320, 336, 360, 384, 400, 416, 440, 468, 480, 496, 512, 530, 560, 600, 640, 680, 720, 760, 800, 840, 880, 920, 960, 1000, etc.

[0232] When the battery cells 21 are sodium-ion battery cells, 1.5V≦U0≦4V, 230≦Y1*Y2≦1000, and the voltage of the energy storage converter 20 can be controlled within a reasonable range, preventing the voltage of the energy storage device 10 from being too low. This not only allows the energy storage device 10 to be adapted to an energy storage converter 20 with a relatively high operating voltage, but also prevents the voltage of the energy storage device 10 from being too high, thereby reducing the requirements for the operating voltage of the energy storage converter 20 and reducing production costs.

[0233] In some embodiments, 3.5*10 6 W≦P≦7.5*10 6 W, M=A, 1≦X1*X2≦18.

[0234] In this example, P is 3.5*10 6 W, 3.75*10 6 W, 4*10 6 W, 4.2*10 6 W, 4.5*10 6 W, 4.9*106 W, 5*10 6 W, 5.2*10 6 W, 5.5*10 6 W, 5.8*10 6 W, 6*10 6 W, 6.2*10 6 W, 6.8*10 6 W, 7*10 6 W, 7.2*10 6 W, 7.5*10 6 It may be any one point value or a range value between any two of W, etc. X1*X2 may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.

[0235] The battery cell 21 is a sodium ion battery cell, and the 6 W≦P≦7.5*10 6 When W and M=A, X1*X2 can be set within the range of 1 to 18, so that the capacity of the battery cell 21 can be controlled within a reasonable range.

[0236] In some embodiments, X1=1.

[0237] In this embodiment, the battery cell 21 is a sodium ion battery cell, and X2 may be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, or 18.

[0238] In some embodiments, X2=1, and 1200 Ah≦C≦18000 Ah.

[0239] In this embodiment, X1=1 and X2=1, and C may be any one of the point values ​​of 1200Ah, 1500Ah, 1800Ah, 2000Ah, 3000Ah, 4000Ah, 5000Ah, 6000Ah, 7000Ah, 8000Ah, 9000Ah, 10000Ah, 11000Ah, 12000Ah, 13000Ah, 14000Ah, 15000Ah, 16000Ah, 17000Ah, 18000Ah, etc., or a range value between any two of them.

[0240] When the battery cells 21 are sodium ion battery cells, and the number X1 of parallel connections of the batteries 2 in the battery chamber 11 and the number X2 of parallel connections of the battery cells 21 of the batteries 2 are both 1, by setting the capacity of the battery cells 21 within the range of 1200 Ah to 18000 Ah, not only can the power consistency requirement of the energy storage device 10 be met, but also the voltage requirement of the energy storage device 10 can be met.

[0241] In some embodiments, 2000 Ah≦C≦10000 Ah.

[0242] In this embodiment, the battery cell 21 is a sodium ion battery cell, and X1 = 1 and X2 = 1. C may be any one of the point values ​​of 2000 Ah, 2300 Ah, 2500 Ah, 2800 Ah, 3000 Ah, 3300 Ah, 3500 Ah, 3800 Ah, 4000 Ah, 4300 Ah, 4500 Ah, 4800 Ah, 5000 Ah, 5300 Ah, 5500 Ah, 5800 Ah, 6000 Ah, 6300 Ah, 6500 Ah, 6800 Ah, 7000 Ah, 8000 Ah, 9000 Ah, 10000 Ah, etc., or a range value between any two of them.

[0243] In some embodiments, X2=2, and 600 Ah≦C≦9000 Ah.

[0244] In this embodiment, the battery cell 21 is a sodium ion battery cell, and X1 = 1 and X2 = 2. C may be any one of the point values ​​of 600 Ah, 650 Ah, 700 Ah, 750 Ah, 850 Ah, 1000 Ah, 1500 Ah, 2000 Ah, 2500 Ah, 3000 Ah, 3500 Ah, 4000 Ah, 4500 Ah, 5000 Ah, 5500 Ah, 6000 Ah, 6500 Ah, 7000 Ah, 7500 Ah, 8000 Ah, 8500 Ah, 9000 Ah, etc., or a range value between any two of them.

[0245] When the battery cells 21 are sodium ion battery cells, the number X1 of parallel connections of the batteries 2 in the battery chamber 11 is 1, and the number X2 of parallel connections of the battery cells 21 of the battery 2 is 2, by setting the capacity of the battery cells 21 within the range of 600 Ah to 9000 Ah, not only can the power consistency requirement of the energy storage device 10 be met, but also the voltage requirement of the energy storage device 10 can be met.

[0246] In some embodiments, 1600 Ah≦C≦4000 Ah.

[0247] In this embodiment, the battery cell 21 is a sodium ion battery cell, and X1 = 1 and X2 = 2. C may be any one of the point values ​​of 1600 Ah, 1700 Ah, 1800 Ah, 1900 Ah, 2000 Ah, 2100 Ah, 2200 Ah, 2300 Ah, 2400 Ah, 2500 Ah, 2600 Ah, 2700 Ah, 2800 Ah, 2900 Ah, 3000 Ah, 3100 Ah, 3200 Ah, 3300 Ah, 3400 Ah, 3500 Ah, 3600 Ah, 3700 Ah, 3800 Ah, 3900 Ah, 4000 Ah, etc., or a range value between any two of them.

[0248] In some embodiments, 2≦X1≦6.

[0249] In this embodiment, X1 may be 2, 3, 4, 5, or 6.

[0250] In this embodiment, by controlling the number X1 of parallel-connected batteries 2 in the battery chamber 11 within a reasonable range, the capacity of the battery cells 21 is prevented from becoming too large, which not only reduces the difficulty and cost of manufacturing the battery cells 21 but also prevents the number X1 of parallel-connected batteries 2 in the battery chamber 11 from becoming too large, which is advantageous for improving the space utilization rate of the battery chamber 11.

[0251] In some embodiments, X1=4, X2=1, and 300 Ah≦C≦4000 Ah.

[0252] In this embodiment, the battery cell 21 is a sodium ion battery cell, and C may be any one of the point values ​​of 300 Ah, 375 Ah, 400 Ah, 500 Ah, 800 Ah, 1000 Ah, 1300 Ah, 1500 Ah, 1800 Ah, 2000 Ah, 2300 Ah, 2500 Ah, 2600 Ah, 2800 Ah, 3000 Ah, 3150 Ah, 3300 Ah, 3500 Ah, 3700 Ah, 3900 Ah, 4000 Ah, etc., or a range value between any two of them.

[0253] When the battery cell 21 is a sodium ion battery cell, and X1=4 and X2=1, by setting the capacity of the battery cell 21 within the range of 300 Ah to 4000 Ah, not only can the power consistency requirement of the energy storage device 10 be met, but also the voltage requirement of the energy storage device 10 can be met.

[0254] In some embodiments, 700 Ah < C < 1500 Ah.

[0255] In this embodiment, the battery cell 21 is a sodium ion battery cell, X1=4, X2=1, and C may be any one of point values ​​of 700 Ah, 800 Ah, 900 Ah, 1000 Ah, 1100 Ah, 1200 Ah, 1300 Ah, 1400 Ah, 1500 Ah, etc., or a range value between any two of them.

[0256] In some embodiments, X1=4, X2=2, and 150Ah≦C≦1500Ah.

[0257] In this embodiment, C may be any one of the point values ​​of 150Ah, 200Ah, 300Ah, 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, etc., or a range value between any two of them.

[0258] When the battery cell 21 is a sodium ion battery cell, and X1=4 and X2=2, by setting the capacity of the battery cell 21 within the range of 150 Ah to 1500 Ah, not only can the power consistency requirement of the energy storage device 10 be met, but also the voltage requirement of the energy storage device 10 can be met.

[0259] In some embodiments, 350 Ah < C < 1200 Ah.

[0260] In this embodiment, the battery cell 21 is a sodium ion battery cell, X1=4, X2=2, and C may be any one of the point values ​​of 350 Ah, 400 Ah, 450 Ah, 500 Ah, 550 Ah, 600 Ah, 650 Ah, 700 Ah, 750 Ah, 800 Ah, 850 Ah, 900 Ah, 950 Ah, 1000 Ah, 1050 Ah, 1100 Ah, 1200 Ah, etc., or a range value between any two of them.

[0261] In some embodiments, 400 Ah < C < 650 Ah.

[0262] In this embodiment, the battery cell 21 is a sodium ion battery cell, X1=4, X2=2, and C may be any one of the point values ​​of 400Ah, 420Ah, 450Ah, 470Ah, 490Ah, 500Ah, 506Ah, 530Ah, 550Ah, 580Ah, 600Ah, 630Ah, 650Ah, etc., or a range value between any two of them.

[0263] In some embodiments, combining FIG. 3 and FIG. 8, X1 first assembled batteries 2a are arranged along the longitudinal direction X of the housing.

[0264] In this embodiment, the battery chamber 11 accommodates N1 batteries 2, which are formed from X1 first assembled batteries 2a connected in parallel, and each first assembled battery 2a is formed by connecting Y1 batteries 2 in series. For example, 2≦X1≦6.

[0265] It should be noted that regardless of whether the battery cells 21 are sodium ion batteries 2, whether the positive electrode material of the battery cells 21 includes a lithium-containing phosphate, or whether the positive electrode material of the battery cells 21 includes a lithium transition metal oxide, X1 first assembled batteries 2a may be arranged along the longitudinal direction X of the housing.

[0266] In this embodiment, X1 first assembled batteries 2a are arranged along the longitudinal direction X of the housing. When X is set between 2 and 6, the space in the battery chamber 11 along the longitudinal direction X of the housing can be fully utilized, resulting in a rational layout and being advantageous for improving the space utilization rate of the battery chamber 11.

[0267] 12 to 14, in some embodiments, Fig. 12 is a structural schematic diagram of an energy storage device 10 according to some other embodiments of the present application, Fig. 13 is a structural schematic diagram of the housing 1 shown in Fig. 12, and Fig. 14 is a BB cross-sectional view of the energy storage device 10 shown in Fig. 12. The battery chamber 11 includes a plurality of sub-chambers 111, which are arranged along the longitudinal direction X of the housing, and each sub-chamber 111 accommodates one first assembled battery 2a along the longitudinal direction X of the housing.

[0268] The first assembled battery 2a in each sub-chamber 111 may be referred to as a battery cluster, and the number of battery clusters may be equal to the number of sub-chambers 111. During installation, Y1 batteries 2 may be housed in a sub-chamber 111 and connected in series to form a corresponding first assembled battery 2a.

[0269] The number of sub-chambers 111 may be two, three, four, five, six, or more. Two adjacent sub-chambers 111 may be separated by a partition member 112, which 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.

[0270] 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. Along the longitudinal direction X of the housing, the sub-chamber 111 may accommodate one battery 2 or multiple batteries 2. Along the height direction Z of the housing, the sub-chamber 111 may accommodate one battery 2 or multiple batteries 2. Along the width direction of the housing 1, the sub-chamber 111 may accommodate one battery 2 or multiple batteries 2.

[0271] In this embodiment, the battery chamber 11 is divided into a plurality of sub-chambers 111, and each of the sub-chambers 111 can accommodate a first assembled battery 2a. This allows the first assembled batteries 2a to be accommodated more regularly in the battery chamber 11, making it easier to install the batteries 2 in the first assembled battery 2a.

[0272] In some embodiments, still referring to Figures 12 to 14, along the height direction Z of the housing, the battery chamber 11 accommodates only one first assembled battery 2a, and Y1 batteries 2 in each first assembled battery 2a are arranged along the height direction Z of the housing, where 2≦Y1≦10.

[0273] Y1 may be 2, 3, 4, 5, 6, 7, 8, 9, or 10.

[0274] As can be seen, all of the batteries 2 in the first battery pack 2a are arranged along the height direction Z of the housing. In an embodiment in which the sub-chamber 111 accommodates only one first battery pack 2a, as can be seen, the sub-chamber 111 accommodates multiple batteries 2 along the height direction Z of the housing, with the multiple batteries 2 being connected in series. For example, along the width direction Y of the housing, the sub-chamber 111 accommodates only one battery 2, and along the length direction X of the housing, the sub-chamber 111 accommodates only one battery 2.

[0275] For example, support members 113 are installed on both sides of each sub-chamber 111 along the longitudinal direction X of the housing. The support members 113 are located at the bottom of the batteries 2 along the height direction Z of the housing. The support members 113 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 reduces the impact on adjacent batteries 2 when inserting or removing one battery 2.

[0276] In an embodiment in which the housing 1 has an electrical room 14 and a main control room 13, the main control unit in the main control room 13 can realize high-voltage control and communication of the first assembled battery 2a (battery cluster), and the busbar unit in the electrical room 14 can realize a parallel-connection busbar for multiple first assembled batteries 2a, and can realize a safe connection between the multiple first assembled batteries 2a and the DC side of the energy storage converter 20.

[0277] In this embodiment, all of the batteries 2 in the first assembled battery 2a are arranged along the height direction Z of the housing, which is advantageous for realizing a series connection of all of the batteries 2 in the first assembled battery 2a. By setting Y1 between 2 and 10, Y1 is prevented from being too large. This is advantageous for improving the space utilization rate of the battery chamber 11, as the number of batteries 2 arranged along the height direction Z of the housing within the battery chamber 11 is not too large.

[0278] 15 to 18, in some embodiments, Fig. 15 is a perspective view of a battery cell 21 according to some embodiments of the present application, Fig. 16 is an exploded view of the battery cell 21 shown in Fig. 15, Fig. 17 is an exploded cross-sectional view of the battery cell 21 shown in Fig. 15 taken along a UW plane, and Fig. 18 is an exploded cross-sectional view of the battery cell 21 taken along a VW plane. An embodiment of the present application further provides the battery cell 21, wherein the battery cell 21 includes a housing 211 and at least one electrode assembly 213, and the electrode assembly 213 is housed in the 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. 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, the other is parallel to the width direction Y of the housing, and the other is parallel to the height direction Z of the housing. The housings 211 are disposed opposite each other along the first direction U. The wall 2110 includes a first wall 2113 and a second wall 2114, a third wall 2115 and a fourth wall 2116 arranged opposite each other along a second direction V, and a fifth wall 2117 and a sixth wall 2118 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 satisfies (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≧90%.

[0279] 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.

[0280] 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.

[0281] 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%.

[0282] 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.

[0283] (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 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, 93.5%, 94%, 94.5%, 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, etc.

[0284] 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.

[0285] 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.

[0286] 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.

[0287] 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.

[0288] 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 90% or more, making the occupancy rate of the internal space of the housing 211 relatively large and increasing 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.

[0289] A specific explanation will be given below using specific experimental data.

[0290] In the experiment, a rectangular housing battery cell 21 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.

[0291] [Table 2A] [Table 2B]

[0292] As can be seen from a comparison between Examples 10 to 13 and Comparative Example 2 based on Tables 2A and 2B 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)≧90%, and the volumetric energy density of the battery cell 21 can be effectively improved. As can be seen from a comparison between Examples 14 to 17 and Comparative Example 3, 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)≧90%, and the volumetric energy density of the battery cell 21 can be effectively improved. As can be seen from a comparison between Examples 18 to 21 and Comparative Example 4, when the battery cell 21 is a sodium ion battery cell, (W1-a)*(T1-b)*(K1-c) / (W1*T1*K1)≧90%, and the volumetric energy density of the battery cell 21 can be effectively improved.

[0293] In some embodiments, (W1-a) / W1≧97.0%, (T1-b) / T1≧96.5%, and (K1-c) / K1≧96.5%.

[0294] By setting the ratio of W1-a to W1 to 97.0% 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, such as 97%, 97.5%, 98%, 98.5%, 99%, and 99.5%, or a range value between any two of them.

[0295] By setting the ratio of T1-b to T1 to 96.5% 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 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, and 99.5%, or a range value between any two of them.

[0296] By setting the ratio of K1-c to K1 to 96.5% 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: 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, etc., or a range value between any two of them.

[0297] In some embodiments, still referring to Figures 15 to 18, 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 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.

[0298] 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, seaming, or the like.

[0299] 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 the difficulty of attaching the electrode terminal 212 to the housing 211.

[0300] 17 and 18, 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.

[0301] 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.

[0302] 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.

[0303] In some embodiments, the battery cell 21 may further include a first insulating member 214 and a second insulating member 215, where 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, the maximum size of the second insulating member 215 in the third direction W is e2, and satisfy (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e1-e2) / (W1*T1*K1)≧88%, 0.3mm≦e1≦1.2mm, and 2mm≦e2≦10mm.

[0304] (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 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.

[0305] e1 may be any one of the point values ​​of 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., or a range value between any two of them.

[0306] e2 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 them.

[0307] 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.

[0308] In this embodiment, (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e1-e2) / (W1*T1*K1)≧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.

[0309] In some embodiments, the battery cell 21 may further include a first insulating member 214 and a second insulating member 215, where 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, the maximum size of the second insulating member 215 in the third direction W is e2, and satisfy (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1)≧85%, 0.3mm≦e1≦1.2mm, and 2mm≦e2≦10mm.

[0310] (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1) may be any one of the following point values ​​or a range value between any two of 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.

[0311] e1 may be any one of the point values ​​of 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., or a range value between any two of them.

[0312] e2 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 them.

[0313] 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.

[0314] In this embodiment, (W1-a-4mm)*(T1-b-4mm)*(K1-c-e1-e2) / (W1*T1*K1)≧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.

[0315] 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.

[0316] 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.

[0317] 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.

[0318] 19 to 22, in some embodiments, FIG. 19 is a perspective view of a battery cell 21 according to some other embodiments of the present application, FIG. 20 is an exploded view of the battery cell 21 shown in FIG. 19, FIG. 21 is an exploded cross-sectional view of the battery cell 21 shown in FIG. 19 taken along a UW plane, and FIG. 22 is an exploded cross-sectional view of the battery cell 21 shown in FIG. 19 taken along a VW plane. The housing 211 includes a case 2111 and two end caps 2112. The case 2111 has two openings disposed opposite each other along a third direction W. The two end caps 2112 cover the two openings, respectively. The case 2111 includes a first wall 2113, a second wall 2114, a third wall 2115, and a fourth wall 2116 that are integrally formed with the battery cell 2112. The two end caps 2112 have a fifth wall 2117 and a sixth wall 2118, respectively.

[0319] In this embodiment, the case 2111 has a hollow structure with openings formed on both ends, and the housing 211 has two end caps 2112, which seal the openings on both ends of the case 2111, respectively.

[0320] 21 and 22, 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.

[0321] 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.

[0322] 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 part of the internal space of the housing 211, thereby reducing the space remaining for the electrode assembly 213 and the electrolyte.

[0323] In some embodiments, the battery cell 21 may further include a third insulating member 216 and a fourth insulating member 217, where 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, the maximum size of the fourth insulating member 217 in the third direction W is e4, and satisfy (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e3-e4) / (W1*T1*K1)≧88%, 2mm≦e3≦10mm, and 2mm≦e4≦10mm.

[0324] (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 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.

[0325] 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 them.

[0326] e4 may be any one of the point values ​​of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two of them.

[0327] 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.

[0328] In this embodiment, (W1-a-1.6mm)*(T1-b-1.6mm)*(K1-c-e3-e4) / (W1*T1*K1)≧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.

[0329] In some embodiments, the battery cell 21 may further include a third insulating member 216 and a fourth insulating member 217, where 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, the maximum size of the fourth insulating member 217 in the third direction W is e4, and satisfy (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1)≧85%, 2mm≦e3≦10mm, and 2mm≦e4≦10mm.

[0330] (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1) may be any one of the following point values ​​or a range value between any two of 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.

[0331] 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 them.

[0332] e4 may be any one of the point values ​​of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two of them.

[0333] 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.

[0334] In this embodiment, (W1-a-4mm)*(T1-b-4mm)*(K1-c-e3-e4) / (W1*T1*K1)≧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.

[0335] 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.

[0336] 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.

[0337] When end caps 2112 are installed on both ends of the case 2111 and 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.

[0338] In some embodiments, 3000 cm 3 ≦W1*T1*K1≦40000cm 3 is.

[0339] W1*T1*K1 is 3000cm 3 , 5000cm 3 , 8000cm 3 , 10000cm 3 , 13000cm 3 , 15000cm 3 , 18000cm 3 , 20000cm 3 , 23000cm 3 , 25000cm 3 , 28000cm 3 , 30000cm 3 , 33000cm 3 , 35000cm 3 , 38000cm 3 , 40000cm 3 It may be any one point value or a range value between any two of the above.

[0340] In this embodiment, W1*T1*K1≧3000 cm 3 When the ratio of the volume of the inner space of the housing 211 to the volume of the housing 211 is 90% or more, the structural strength requirement of the housing 211 can be met by making the wall thickness of the housing 211 not too small, and W1*T1*K1≦40000cm 3Therefore, the capacity and current of the battery cell 21 can be controlled within an appropriate range, and the risk of damage to overcurrent elements in the circuit can be reduced.

[0341] In some embodiments, 3200 cm 3 ≦W1*T1*K1≦32000cm 3 is.

[0342] In this example, W1*T1*K1 is 3200 cm 3 , 3500cm 3 , 4200cm 3 , 5000cm 3 , 6000cm 3 , 7000cm 3 , 8000cm 3 , 9000cm 3 , 10000cm 3 , 11000cm 3 , 12000cm 3 , 13000cm 3 , 14000cm 3 , 15000cm 3 , 16000cm 3 , 17000cm 3 , 18000cm 3 , 19000cm 3 , 20000cm 3 , 21000cm 3 , 22000cm 3 , 23000cm 3 , 24000cm 3 , 25000cm 3 , 26000cm 3 , 27000cm 3 , 28000cm 3 , 29000cm 3 , 30000cm 3 , 31000cm 3 , 32000cm 3 It may be any one point value or a range value between any two of the above.

[0343] In this example, 3200 cm 3 ≦W1*T1*K1≦32000cm 3This allows the structural strength of the housing 211 and the heat generation requirement of the battery cell 21 to be compatible, further improving the structural strength of the housing 211 and reducing the risk of damage to overcurrent elements in the circuit.

[0344] In some embodiments, 3720 cm 3 ≦W1*T1*K1≦12500cm 3 is.

[0345] In this example, W1*T1*K1 is 3720 cm 3 , 3900cm 3 , 4200cm 3 , 4600cm 3 , 4800cm 3 , 5000cm 3 , 5200cm 3 , 5800cm 3 , 6000cm 3 , 6200cm 3 , 6800cm 3 , 7000cm 3 , 7200cm 3 , 7800cm 3 , 8000cm 3 , 8200cm 3 , 8800cm 3 , 9000cm 3 , 9200cm 3 , 9800cm 3 , 10000cm 3 , 10200cm 3 , 10800cm 3 , 11000cm 3 , 11200cm 3 , 11800cm 3 , 12000cm 3 , 12500cm 3 It may be any one point value or a range value between any two of the above.

[0346] In some embodiments, 4000 cm 3 ≦W1*T1*K1≦6000cm 3 is.

[0347] In this example, W1*T1*K1 is 4000 cm 3 , 4100cm 3 , 4200cm 3 , 4300cm 3 , 4400cm 3 , 4500cm 3 , 4600cm 3 , 4700cm 3 , 4800cm 3 , 4900cm 3 , 5000cm 3 , 5100cm 3 , 5200cm 3 , 5300cm 3 , 5400cm 3 , 5500cm 3 , 5600cm 3 , 5700cm 3 , 5800cm 3 , 5900cm 3 , 6000cm 3 It may be any one point value or a range value between any two of the above.

[0348] In some embodiments, the positive electrode material of the battery cell 21 includes a lithium-containing phosphate and satisfies C≧350 Ah, C / ((W1−a)*(T1−b)*(K1−c))≧118 Ah / L.

[0349] 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 90% or more.

[0350] In some embodiments, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide and satisfies C≧650 Ah, C / ((W1−a)*(T1−b)*(K1−c))≧190 Ah / L.

[0351] 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, 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 90% or more.

[0352] In some embodiments, the battery cells 21 are sodium-ion battery cells, and satisfy C≧260 Ah, C / ((W1−a)*(T1−b)*(K1−c))≧87 Ah / L.

[0353] When the battery cell 21 is a sodium ion battery cell 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 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 90% or more.

[0354] In addition, an embodiment of the present application provides an energy storage system 100, which includes an energy storage converter 20 and M energy storage devices 10 according to any one of the above embodiments, and the energy storage devices 10 are electrically connected to the energy storage converter 20.

[0355] where M is a positive integer, and M may be 1, 2, 3, 4, 5, 6, 7, 8, etc.

[0356] In some embodiments, M=2 and A=2, or M=4 and A=4, or M=8 and A=8.

[0357] An embodiment of the present application further provides an energy storage device 10, which is used to electrically connect an energy storage converter 20, and which can be used to cooperate with M energy storage devices 10, where M is a positive integer. The rated output power of the energy storage converter 20 is P, measured in W; the energy of the energy storage device 10 is Q, measured in Wh; and the time it takes for the energy storage device 10 to discharge from a fully charged state to a fully discharged state is A, measured in h. The energy storage device 10 includes a housing 1 and a plurality of batteries 2, the housing 1 including a battery chamber 11, and the plurality of batteries 2 are housed in the battery chamber 11. The battery 2 includes a housing 1 and a plurality of battery cells 21 housed in the housing 1. The capacity of the battery cell 21 is C, measured in Ah, and the plateau voltage of the battery cell 21 is U0, measured in V. The battery compartment 11 accommodates N1 batteries 2, which are formed from X1 first assembled batteries 2a connected in parallel, and each first assembled battery 2a is formed by connecting Y1 batteries 2 in series, where N1=X1*Y1. The battery 2 includes N2 battery cells 21, which are formed from Y2 second battery cell groups 21b connected in series, and each second battery cell group 21b is formed by connecting X2 battery cells 21 in parallel, where N2=X2*Y2 and Q=N1*N2*C*U0. The maximum operating voltage on the DC side of the energy storage converter 20 is U1, and the minimum operating voltage on the DC side of the energy storage converter 20 is U2, U2 <U0*Y1*Y2<U1である。

[0358] Here, the positive electrode material of battery cell 21 contains lithium iron phosphate, and P=4,900,000 W, M=A=4, U1=1,500 V, U2=900 V, C=530 Ah, U0=3.23, X1=4, Y1=8, X2=2, Y2=52, and P / (M*Q / A)=P / (M*X1*Y1*X2*Y2*C*U0 / A)=0.86.

[0359] It should be mentioned that, unless there is a conflict, the embodiments and features in the embodiments in the present application can be combined with each other.

[0360] 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]

[0361] 1-enclosure, 11-battery compartment, 111-sub-compartment, 112-partition member, 113-support member, 12-thermal management compartment, 13-main control compartment, 14-electrical compartment, 2-battery, 2a-first battery pack, 2b-second battery pack, 21-battery cell, 21a-first battery cell group, 21b-second battery cell group, 211-housing, 2111-case, 2112-end cap, 2113-first wall, 2114-second wall, 2115-third wall, 2116-fourth wall, 2117-fifth wall, 2118-third wall 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, 10 - energy storage device, 20 - energy storage converter, 100 - energy storage system, 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 for electrically connecting an energy storage converter, wherein the energy storage converter is usable to cooperate with M of the energy storage devices, M is a positive integer, the rated output power of the energy storage converter is P in W, the energy of the energy storage devices is Q in Wh, the length of time it takes for the energy storage devices to discharge from a fully charged state to a fully discharged state is A in h, and 0.7≦P / (M*Q / A)≦0.99 is satisfied.

2. 10. The energy storage device of claim 1, wherein 0.75≦P / (M*Q / A)≦0.95, and optionally 0.85≦P / (M*Q / A)≦0.

93.

3. The energy storage device is a housing including a battery compartment; at least one battery housed in the battery compartment, the battery including at least one battery cell; Here, the capacity of the battery cell is C, and the unit is Ah, and the plateau voltage of the battery cell is U ０ where the unit is V, the number of battery cells in the battery compartment is N, and Q=N*C*U ０ 2. The energy storage device of claim 1, wherein:

4. The battery compartment is １ The battery is accommodated in the housing, and １ The batteries are connected in parallel to each other. １ Each of the first assembled batteries is formed of Y first assembled batteries. １ N batteries connected in series, or １ The batteries are connected in series １ Each of the second assembled batteries is formed of X １ The battery is formed by connecting N batteries in parallel, １ ≧1, X １ ≧1, Y １ ≧1, N １ =X １ *Y １ Fulfilling The battery is N ２ N battery cells ２ The battery cells are connected in parallel to each other. ２ each of the first battery cell groups is formed from Y first battery cell groups. ２ N battery cells are connected in series, or ２ The battery cells are connected in series to form a Y ２ each of the second battery cell groups is formed from X ２ The battery cells are connected in parallel, and ２ ≧1, X ２ ≧1, Y ２ ≧1, N ２ =X ２ *Y ２ , N=N １ *N ２ The energy storage device of claim 3 , wherein

5. When charging the energy storage device, the maximum operating voltage of the DC side of the energy storage converter is U １ and the minimum operating voltage of the DC side of the energy storage converter is U ２ and U ２ <U ０ *Y １ *Y ２ <U １ The energy storage device according to claim 4, wherein

6. The positive electrode material of the battery cell includes a lithium-containing phosphate, and 2.8V≦U ０ ≦3.6V, 250≦Y １ *Y ２ 6. The energy storage device of claim 5, wherein: ≦468.

7. The positive electrode material of the battery cell includes lithium iron phosphate, and 3.1V≦U ０ ≦3.3V, 400≦Y １ *Y ２ 7. The energy storage device of claim 6, wherein: ≦424.

8. 3.5*10 ６ W≦P≦7.5*10 ６ W, M=A, 1≦X １ *X ２ 8. The energy storage device of claim 6 or 7, wherein: ≦18.

9. X １ 9. The energy storage device of claim 8, wherein:

10. X ２ 10. The energy storage device of claim 9, wherein C=1, 2000 Ah≦C≦11000 Ah.

11. 11. The energy storage device of claim 10, wherein 2500 Ah < C < 6000 Ah.

12. X ２ 10. The energy storage device of claim 9, wherein C = 2 and 1000 Ah ≤ C ≤ 5500 Ah.

13. 13. The energy storage device of claim 12, wherein 2000 Ah < C < 4000 Ah.

14. 2≦X １ 9. The energy storage device of claim 8, wherein:

15. X １ = 4, X ２ 15. The energy storage device of claim 14, wherein C = 1,500 Ah ≤ C ≤ 2600 Ah.

16. 16. The energy storage device of claim 15, wherein 800 Ah < C < 1500 Ah.

17. X １ = 4, X ２ 15. The energy storage device of claim 14, wherein: C = 2, 250 Ah ≤ C ≤ 1300 Ah.

18. 18. The energy storage device of claim 17, wherein 350 Ah < C < 1000 Ah, and optionally 500 Ah < C < 700 Ah.

19. X １ The energy storage device according to claim 14 , wherein the first assembled batteries are arranged along a longitudinal direction of the housing.

20. 20. The energy storage device of claim 19, wherein the battery chamber includes a plurality of sub-chambers arranged along a longitudinal direction of the housing, and each of the sub-chambers along the longitudinal direction of the housing houses one of the first assembled batteries.

21. The positive electrode material of the battery cell includes a lithium transition metal oxide, and 2.8V≦U ０ ≦4.35V, 210≦Y １ *Y ２ 6. The energy storage device of claim 5, wherein: ≦530.

22. 3.5*10 ６ W≦P≦7.5*10 ６ W, M=A, 1≦X １ *X ２ 22. The energy storage device of claim 21, wherein: ≦18.

23. X １ 23. The energy storage device of claim 22, wherein: = 1.

24. X ２ 24. The energy storage device of claim 23, wherein C = 1, 1500 Ah ≤ C ≤ 13400 Ah.

25. 25. The energy storage device of claim 24, wherein 3000 Ah < C < 7000 Ah.

26. X ２ 24. The energy storage device of claim 23, wherein C = 2,750 Ah < C < 6670 Ah.

27. 27. The energy storage device of claim 26, wherein 1800 Ah < C < 4000 Ah.

28. 2≦X １ 23. The energy storage device of claim 22, wherein: ≦6.

29. X １ = 4, X ２ 29. The energy storage device of claim 28, wherein C = 1,375 Ah < C < 3300 Ah.

30. 30. The energy storage device of claim 29, wherein 700 Ah < C < 1600 Ah.

31. X １ = 4, X ２ 29. The energy storage device of claim 28, wherein C = 2, and 200 Ah < C < 1600 Ah.

32. 32. The energy storage device of claim 31, wherein 340 Ah < C < 1050 Ah, and optionally 490 Ah < C < 720 Ah.

33. X １ The energy storage device according to claim 28 , wherein the first assembled batteries are arranged along a longitudinal direction of the housing.

34. 34. The energy storage device of claim 33, wherein the battery compartment includes a plurality of sub-compartments arranged along a longitudinal direction of the housing, and each of the sub-compartments along the longitudinal direction of the housing houses one of the first assembled batteries.

35. The battery cell is a sodium ion battery cell, and 1.5V≦U ０ ≦4V, 230≦Y １ *Y ２ 6. The energy storage device of claim 5, wherein:

36. 3.5*10 ６ W≦P≦7.5*10 ６ W, M=A, 1≦X １ *X ２ 36. The energy storage device of claim 35, wherein: ≦18.

37. X １ 37. The energy storage device of claim 36, wherein: = 1.

38. X ２ 38. The energy storage device of claim 37, wherein C = 1, and 1200 Ah < C < 18000 Ah.

39. 39. The energy storage device of claim 38, wherein 2000 Ah < C < 10000 Ah.

40. X ２ 38. The energy storage device of claim 37, wherein C = 2, 600 Ah < C < 9000 Ah.

41. 41. The energy storage device of claim 40, wherein 1600 Ah < C < 4000 Ah.

42. 2≦X １ 37. The energy storage device of claim 36, wherein: ≦6.

43. X １ = 4, X ２ 43. The energy storage device of claim 42, wherein C = 1, 300 Ah < C < 4000 Ah.

44. 44. The energy storage device of claim 43, wherein 700 Ah < C < 1500 Ah.

45. X １ = 4, X ２ 45. The energy storage device of claim 44, wherein C = 2, and 150 Ah < C < 1500 Ah.

46. 46. ​​The energy storage device of claim 45, wherein 350 Ah < C < 1200 Ah, and optionally 400 Ah < C < 650 Ah.

47. X １ 47. The energy storage device according to claim 42, wherein the first assembled batteries are arranged along a longitudinal direction of the housing.

48. 48. The energy storage device of claim 47, wherein the battery compartment includes a plurality of sub-compartments arranged along a longitudinal direction of the housing, and each sub-compartment along the longitudinal direction of the housing accommodates one of the first assembled batteries.

49. The battery chamber accommodates only one of the first assembled batteries along the height direction of the housing, and the Y １ The batteries are arranged along the height direction of the housing, and 2≦Y １ 49. The energy storage device of any one of claims 4 to 48, wherein < 10.

50. The battery cell includes a housing and at least one electrode assembly, the electrode assembly being housed 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 one of the first direction, the second direction, and the third direction is parallel to a longitudinal direction of the housing, the other is parallel to a width direction of the housing, and the other is parallel to a height direction of the housing; The housing includes a first wall and a second wall that are disposed opposite each other along the first direction, a third wall and a fourth wall that are disposed opposite each other along the second direction, and a fifth wall and a sixth wall that are 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 50. The energy storage device of claim 3, wherein the energy storage device satisfies a .DELTA..times ...

51. (W １ -a) / W １ ≧97.0%, (T １ -b) / T １ ≧96.5%, and (K １ -c) / K １ 51. The energy storage device of claim 50, wherein the energy storage capacity is > 96.5%.

52. the housing includes a case and an end cap, the case has an opening, and the end cap is fitted over the opening; 52. The energy storage device of claim 50 or 51, 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.

53. 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, and 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 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 ) ≧88%, 0.3 mm ≦ e １ ≦1.2 mm and 2 mm≦e ２ 53. The energy storage device of claim 52, wherein the thickness is less than or equal to 10 mm.

54. 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, and 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 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 ) ≧85%, 0.3 mm ≦ e １ ≦1.2 mm and 2 mm≦e ２ 54. The energy storage device of claim 52 or 53, wherein the thickness satisfies ≦10 mm.

55. W １ ≧T １ 55. The energy storage device of claim 52, 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.

56. the housing includes a case and two end caps, the case having two openings disposed opposite to each other along the third direction, and the two end caps covering the two openings, respectively; 52. The energy storage device of claim 50 or 51, wherein the case includes the first wall, the second wall, the third wall, and the fourth wall that are integrally molded, and the two end caps are the fifth wall and the sixth wall, respectively.

57. 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, and the fourth insulating member being disposed between the sixth wall and the electrode assembly and abutting 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 ) ≧88%, 2 mm ≦ e ３ ≦10 mm and 2 mm≦e ４ 57. The energy storage device of claim 56, wherein the thickness is less than or equal to 10 mm.

58. 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, and the fourth insulating member being disposed between the sixth wall and the electrode assembly and abutting 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 ) ≧85%, 2 mm ≦ e ３ ≦10 mm and 2 mm≦e ４ 58. The energy storage device of claim 56 or 57, wherein the thickness satisfies ≦10 mm.

59. W １ ≧T １ 59. The energy storage device of claim 56, 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.

60. 3000 cm ３ ≦W １ *T １ *K １ ≦40000 cm ３ and optionally, 3200 cm ３ ≦W １ *T １ *K １ ≦32000 cm ３ and optionally, 3720 cm ３ ≦W １ *T １ *K １ ≦12500 cm ３ and optionally, 4000 cm ３ ≦W １ *T １ *K １ ≦6000 cm ３ 60. The energy storage device of any one of claims 50 to 59, wherein:

61. The positive electrode material of the battery cell includes a lithium-containing phosphate, and C≧350 Ah, C / ((W １ −a)*(T １ −b)*(K １ The energy storage device according to any one of claims 50 to 60, wherein -c)) ≥ 118 Ah / L is satisfied.

62. The positive electrode material of the battery cell includes a lithium transition metal oxide, and C≧650 Ah, C / ((W １ −a)*(T １ −b)*(K １ The energy storage device according to any one of claims 50 to 60, wherein -c)) ≥ 190 Ah / L is satisfied.

63. The battery cell is a sodium ion battery cell, C≧260Ah, C / ((W １ −a)*(T １ −b)*(K １ The energy storage device according to any one of claims 50 to 60, wherein -c)) ≥ 87 Ah / L is satisfied.

64. 1. An energy storage system comprising: an energy storage converter; and M energy storage devices according to any one of claims 1 to 63 electrically connected to the energy storage converter.

65. 65. The energy storage system of claim 64, wherein M=2, A=2, or M=4, A=4, or M=8, A=8.

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