CN220711125U - Energy storage device and energy storage system - Google Patents
Energy storage device and energy storage system Download PDFInfo
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- CN220711125U CN220711125U CN202321602695.1U CN202321602695U CN220711125U CN 220711125 U CN220711125 U CN 220711125U CN 202321602695 U CN202321602695 U CN 202321602695U CN 220711125 U CN220711125 U CN 220711125U
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Abstract
The embodiment of the application provides an energy storage device and an energy storage system. The energy storage device is used for electrically connecting the energy storage converter, the energy storage converter can be used for being matched with M energy storage devices, rated output power of the energy storage converter is P, energy of the energy storage device is Q, the duration of discharging the energy storage device from a full charge state to a full discharge state is A, and the requirements are met: P/(M.times.Q/A) is less than or equal to 0.7 and less than or equal to 0.99. P/(M.times.Q/A). Ltoreq.0.99, so that the power of all the energy storage devices matched with the energy storage converter has enough margin compared with the power of the energy storage converter, and the capacity of the energy storage devices is not required to be increased for a long time, thereby realizing the long-term reliability of the energy storage devices. P/(M.times.Q/A) is more than or equal to 0.7, so that the surplus of the power of the energy storage device compared with the power of the energy storage converter is not excessive, the power waste is reduced, and the economical efficiency of the energy storage device is improved. Thus, the power matching property of the energy storage device and the energy storage converter is improved.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to an energy storage device and an energy storage system.
Background
The energy storage device is electric energy storage and transfer equipment, and can be used in an electric power system, and surplus electric energy in the electricity consumption valley period can be stored through the energy storage device so as to supplement electricity consumption in the electricity consumption peak period. Therefore, the energy storage device can store excessive generated energy of the power generation system and can also transmit electric energy to the power grid when the generated energy of the power generation system is small.
The energy storage device generally includes a case and a plurality of battery cells disposed inside the case, and the plurality of battery cells are connected in series, parallel or series-parallel to store electric energy. The energy storage device is generally required to be connected with an energy storage converter so as to realize the charge and discharge of the energy storage device. At present, the power matching of an energy storage device and an energy storage converter is poor.
Disclosure of Invention
The embodiment of the application provides an energy storage device and an energy storage system, which can effectively improve the power matching property of the energy storage device and an energy storage converter.
In a first aspect, an embodiment of the present application provides an energy storage device, configured to electrically connect an energy storage converter, where the energy storage converter can be used to cooperate with M energy storage devices, M is a positive integer, rated output power of the energy storage converter is P, a unit is W, energy of the energy storage device is Q, a unit is Wh, a time period from a full charge state to a full discharge state of the energy storage device is a unit is h, and the following requirements are satisfied: P/(M.times.Q/A) is less than or equal to 0.7 and less than or equal to 0.99.
In the technical scheme, P/(M is Q/A) is less than or equal to 0.99, so that the power of all the energy storage devices matched with the energy storage converter has enough margin compared with the power of the energy storage converter, and the capacity of the energy storage devices is not required to be increased for a long time, thereby realizing the long-term reliability of the energy storage devices; P/(M.times.Q/A) is more than or equal to 0.7, so that the surplus of the power of the energy storage device compared with the power of the energy storage converter is not excessive, the power waste is reduced, and the economical efficiency of the energy storage device is improved. In this way, the power matching performance of the energy storage device and the energy storage converter is improved from the viewpoints of long-term reliability and economy of the energy storage device.
In some embodiments, 0.75.ltoreq.P/(M.times.Q/A). Ltoreq.0.95. The long-term reliability and the economy of the energy storage device are considered, the cost of the energy storage device can be controlled at a lower level, and the capacity supplement period of the energy storage device can be prolonged.
In some embodiments, 0.85.ltoreq.P/(M.times.Q/A). Ltoreq.0.93.
In some embodiments, the energy storage device comprises a housing comprising a battery compartment and at least one battery, the at least one battery being received in the battery compartment, the battery comprising at least one battery cell; the capacity of the battery monomer is C, the unit is Ah, and the platform voltage of the battery monomer is U 0 The unit is V, the number of the battery monomers in the battery compartment is N, and Q=N×C×U 0 . Therefore, the capacities of all the battery monomers in the battery bin are equal, and the battery monomers with the same specification can be selected. On one hand, the assembly efficiency of the energy storage device is improved; on the other hand, the probability of space waste caused by different specifications of the battery monomers in the battery bin can be reduced.
In some embodiments, the battery compartment contains N 1 Batteries, N 1 The individual cells are formed by X 1 A plurality of first battery packs connected in parallel, each first battery pack being formed by Y 1 The batteries are connected in series; or, N 1 The individual cells are formed by Y 1 A plurality of second battery packs connected in series, each of the second battery packs being formed of X 1 The parallel connection of the batteries is formed, and the following conditions are satisfied: n (N) 1 ≥1，X 1 ≥1，Y 1 ≥1，N 1 ＝X 1 *Y 1 The method comprises the steps of carrying out a first treatment on the surface of the The battery includes N 2 Single battery cell, N 2 The single battery is composed of X 2 A plurality of first battery cell groups connected in parallel, each first battery cell group is formed by Y 2 The battery cells are connected in series; or, N 2 The single battery is composed of Y 2 A plurality of second battery cell groups connected in series, each second battery cell group being formed by X 2 The single battery cells are connected in parallel to form, so that the following conditions are satisfied: n (N) 2 ≥1，X 2 ≥1，Y 2 ≥1，N 2 ＝X 2 *Y 2 ，N＝N 1 *N 2 . For N in battery bin 1 For each cell, the first step is to use Y 1 The batteries are connected in series to form a first battery group, and then X is used for connecting the battery group 1 The first battery packs are connected in parallel; or may be formed by X 1 The batteries are connected in parallel to form a second battery group, and Y is used for 1 The second battery packs are connected in series. For N in a battery 2 The battery cells can be prepared by the following steps of 2 The battery cells are connected in series to form a first battery cell group, and then X is used for forming a battery cell group 2 The first battery monomer groups are connected in parallel; may also be represented by X 2 The battery cells are connected in parallel to form a second battery cell group, and Y is used for the battery cell group 2 The second battery cell groups are connected in series. The serial number Y of the batteries in the battery bin can be set according to the requirements 1 Number Y of series connection with battery cell of battery 2 To adjust the voltage of the energy storage device to within a reasonable range.
In some embodiments, the maximum operating voltage on the dc side of the energy storage converter is U when the energy storage device is charged 1 The minimum working voltage of the direct current side of the energy storage converter is U 2 The method comprises the following steps: u (U) 2 ＜U 0 *Y 1 *Y 2 ＜U 1 . The voltage of the energy storage converter is matched with the voltage of the energy storage converter, so that external equipment can charge the energy storage device through the energy storage converter, and the energy storage device can supply power to the external equipment through the energy storage converter.
In some embodiments, the positive electrode of the battery cellThe material comprises lithium-containing phosphate, and U is more than or equal to 2.8V 0 ≤3.6V，250≤Y 1 *Y 2 And is less than or equal to 468. Therefore, when the anode material of the battery monomer comprises lithium-containing phosphate, the voltage of the energy storage converter can be controlled within a reasonable range, so that the voltage of the energy storage device is not too low, the energy storage device can be matched with the energy storage converter with higher working voltage, the voltage of the energy storage device is not too high, the requirement on the working voltage of the energy storage converter is reduced, and the production cost is reduced.
In some embodiments, the positive electrode material of the battery cell comprises lithium iron phosphate, 3.1 V.ltoreq.U 0 ≤3.3V，400≤Y 1 *Y 2 And is less than or equal to 424. Thus, when the positive electrode material of the battery cell comprises lithium iron phosphate, the voltage of the energy storage converter can be controlled within a reasonable range.
In some embodiments, 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 And is less than or equal to 18. The positive electrode material of the battery cell comprises lithium-containing phosphate, 3.5 x 10 6 W≤P≤7.5*10 6 W, and m=a, X may be 1 *X 2 Is set in the range of 1-18 to control the capacity of the battery cell in a reasonable range.
In some embodiments, X 1 ＝1。
In some embodiments, X 2 =1, 2000Ah is less than or equal to C is less than or equal to 11000Ah. The positive electrode material of the battery cell comprises lithium-containing phosphate, and the parallel connection number X of the batteries in the battery bin 1 Parallel connection X with battery cells of a battery 2 Under the condition of 1, the capacity of the battery monomer is set in the range of 2000 Ah-11000 Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 2500 Ah.ltoreq.C.ltoreq.6000 Ah.
In some embodiments, X 2 =2, 1000Ah is less than or equal to C is less than or equal to 5500Ah. The positive electrode material of the battery cell comprises lithium-containing phosphate, and the parallel connection number X of the batteries in the battery bin 1 1 and the parallel number X of the battery cells of the battery 2 In the case of 2, the battery isThe capacity of the monomer is set in the range of 1000 Ah-5500 Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 2000 Ah.ltoreq.C.ltoreq.4000 Ah.
In some embodiments, 2.ltoreq.X 1 And is less than or equal to 6. Thus, the parallel number X of the batteries in the battery compartment 1 The control is within a reasonable range, so that the capacity of the battery monomer is not too large, the manufacturing difficulty and the manufacturing cost of the battery monomer are reduced, and the parallel connection number X of the batteries in the battery bin is also realized 1 Is not too much, and is beneficial to improving the space utilization rate of the battery compartment.
In some embodiments, X 1 ＝4，X 2 =1, 500Ah is less than or equal to C is less than or equal to 2600Ah. The positive electrode material of the battery cell comprises lithium-containing phosphate, and X 1 ＝4，X 2 When the battery is in the range of 500Ah to 2600Ah, the capacity of the battery cell is set to be in the range of=1, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 800Ah C is less than or equal to 1500Ah.
In some embodiments, X 1 ＝4，X 2 =2, 250Ah is less than or equal to C is less than or equal to 1300Ah. The positive electrode material of the battery cell comprises lithium-containing phosphate, and X 1 ＝4，X 2 Under the condition of=2, the capacity of the battery monomer is set in the range of 800 Ah-1500 Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 350 Ah.ltoreq.C.ltoreq.1000 Ah.
In some embodiments, 500 Ah.ltoreq.C.ltoreq.700 Ah.
In some embodiments, X 1 The first battery packs are arranged along the length direction of the box body. The positive electrode material of the battery monomer comprises lithium-containing phosphate, and X is more than or equal to 2 1 X is connected in parallel in the battery bin under the condition of less than or equal to 6 1 The first battery packs are distributed along the length direction of the box body, so that the space of the battery compartment along the length direction of the box body can be fully utilized, the layout is reasonable, and the power supply is improvedSpace utilization of the pool bin.
In some embodiments, the battery compartment includes a plurality of sub-compartments arranged along a length of the case, each sub-compartment housing a first battery pack along the length of the case. Divide into a plurality of sub-warehouses with the battery compartment, all can hold first group battery in every sub-warehouse for first group battery can hold in the battery compartment more regularly, realizes the installation to the battery in the first group battery more easily.
In some embodiments, the positive electrode material of the battery cell comprises lithium transition metal oxide, 2.8 V.ltoreq.U 0 ≤4.35V，210≤Y 1 *Y 2 And less than or equal to 530. Therefore, when the anode material of the battery monomer comprises lithium transition metal oxide, the voltage of the energy storage converter can be controlled within a reasonable range, so that the voltage of the energy storage device is not too low, the energy storage device can be matched with the energy storage converter with higher working voltage, the voltage of the energy storage device is not too high, the requirement on the working voltage of the energy storage converter is reduced, and the production cost is reduced.
In some embodiments, 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 And is less than or equal to 18. The positive electrode material of the battery cell comprises lithium transition metal oxide, 3.5 x 10 6 W≤P≤7.5*10 6 W, and m=a, X may be 1 *X 2 Is set in the range of 1-18 to control the capacity of the battery cell in a reasonable range.
In some embodiments, X 1 ＝1。
In some embodiments, X 2 =1, 1500Ah is less than or equal to C is less than or equal to 13400Ah. The positive electrode material of the battery cell comprises lithium transition metal oxide, and the parallel connection number X of the batteries in the battery bin 1 Parallel connection X with battery cells of a battery 2 Under the condition of 1, the capacity of the battery monomer is set in the range of 1500 Ah-13400 Ah Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 3000 Ah.ltoreq.C.ltoreq.7000 Ah.
In some embodiments, X 2 =2, 750Ah is less than or equal to C is less than or equal to 6670Ah. The positive electrode material of the battery cell comprises lithium transition metal oxide, and the parallel connection number X of the batteries in the battery bin 1 1 and the parallel number X of the battery cells of the battery 2 Under the condition of 2, the capacity of the battery monomer is set within the range of 750 Ah-6670 Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 1800 Ah.ltoreq.C.ltoreq.4000 Ah.
In some embodiments, 2.ltoreq.X 1 And is less than or equal to 6. Thus, the parallel number X of the batteries in the battery compartment 1 The control is within a reasonable range, so that the capacity of the battery monomer is not too large, the manufacturing difficulty and the manufacturing cost of the battery monomer are reduced, and the parallel connection number X of the batteries in the battery bin is also realized 1 Is not too much, and is beneficial to improving the space utilization rate of the battery compartment.
In some embodiments, X 1 ＝4，X 2 =1, 375Ah is C is 3300Ah. The positive electrode material of the battery cell comprises lithium transition metal oxide, and X 1 ＝4，X 2 Under the condition of=1, the capacity of the battery monomer is set in the range of 375 Ah-3300 Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 700 Ah.ltoreq.C.ltoreq.1600 Ah.
In some embodiments, X 1 ＝4，X 2 =2, 200Ah is less than or equal to C is less than or equal to 1600Ah. The positive electrode material of the battery cell comprises lithium transition metal oxide, and X 1 ＝4，X 2 Under the condition of=2, the capacity of the battery monomer is set in the range of 200 Ah-1600 Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 340Ah C1050 Ah.
In some embodiments, 490Ah C.ltoreq.720 Ah.
In some embodiments, X 1 The first battery packs are arranged along the length direction of the box body.The positive electrode material of the battery cell comprises lithium transition metal oxide, and X is more than or equal to 2 1 X is connected in parallel in the battery bin under the condition of less than or equal to 6 1 The first battery packs are distributed along the length direction of the box body, so that the space of the battery compartment along the length direction of the box body can be fully utilized, the layout is reasonable, and the space utilization rate of the battery compartment is improved.
In some embodiments, the battery compartment includes a plurality of sub-compartments arranged along a length of the case, each sub-compartment housing a first battery pack along the length of the case. Divide into a plurality of sub-warehouses with the battery compartment, all can hold first group battery in every sub-warehouse for first group battery can hold in the battery compartment more regularly, realizes the installation to the battery in the first group battery more easily.
In some embodiments, the cells are sodium ion cells, 1.5 V.ltoreq.U 0 ≤4V，230≤Y 1 *Y 2 Less than or equal to 1000. Therefore, when the battery monomer is a sodium ion battery monomer, the voltage of the energy storage converter can be controlled within a reasonable range, so that the voltage of the energy storage device is not too low, the energy storage device can be matched with the energy storage converter with higher working voltage, the voltage of the energy storage device is not too high, the requirement on the working voltage of the energy storage converter is reduced, and the production cost is reduced.
In some embodiments, 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 And is less than or equal to 18. The battery cell is a sodium ion battery cell, 3.5 x 10 6 W≤P≤7.5*10 6 W, and m=a, X may be 1 *X 2 Is set in the range of 1-18 to control the capacity of the battery cell in a reasonable range.
In some embodiments, X 1 ＝1。
In some embodiments, X 2 =1, 1200Ah is less than or equal to C is less than or equal to 18000Ah. The battery monomer is sodium ion battery monomer, and the parallel connection number X of the batteries in the battery bin 1 Parallel connection X with battery cells of a battery 2 Under the condition of 1, the capacity of the battery monomer is set in the range of 1200Ah to 18000Ah, namelyThe power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 2000 Ah.ltoreq.C.ltoreq.10000 Ah.
In some embodiments, X 2 =2, 600Ah is less than or equal to C is less than or equal to 9000Ah. The battery monomer is sodium ion battery monomer, and the parallel connection number X of the batteries in the battery bin 1 1 and the parallel number X of the battery cells of the battery 2 In the case of 2, the capacity of the battery monomer is set in the range of 600Ah to 9000Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments 1600 Ah.ltoreq.C.ltoreq.4000 Ah.
In some embodiments, 2.ltoreq.X 1 And is less than or equal to 6. Thus, the parallel number X of the batteries in the battery compartment 1 The control is within a reasonable range, so that the capacity of the battery monomer is not too large, the manufacturing difficulty and the manufacturing cost of the battery monomer are reduced, and the parallel connection number X of the batteries in the battery bin is also realized 1 Is not too much, and is beneficial to improving the space utilization rate of the battery compartment.
In some embodiments, X 1 ＝4，X 2 =1, 300Ah is less than or equal to C is less than or equal to 4000Ah. The battery monomer is sodium ion battery monomer, and X 1 ＝4，X 2 Under the condition of=1, the capacity of the battery monomer is set in the range of 300Ah to 4000Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 700 Ah.ltoreq.C.ltoreq.1500 Ah.
In some embodiments, X 1 ＝4，X 2 =2, 150Ah is less than or equal to C is less than or equal to 1500Ah. The battery monomer is sodium ion battery monomer, and X 1 ＝4，X 2 Under the condition of=2, the capacity of the battery monomer is set in the range of 150 Ah-1500 Ah, so that the power matching requirement of the energy storage device can be met, and the voltage requirement of the energy storage device can be met.
In some embodiments, 350 Ah.ltoreq.C.ltoreq.1200 Ah.
In some embodiments, 400Ah C is less than or equal to 650Ah.
In some embodiments, X 1 The first battery packs are arranged along the length direction of the box body. The battery monomer is sodium ion battery monomer, and X is more than or equal to 2 1 X is connected in parallel in the battery bin under the condition of less than or equal to 6 1 The first battery packs are distributed along the length direction of the box body, so that the space of the battery compartment along the length direction of the box body can be fully utilized, the layout is reasonable, and the space utilization rate of the battery compartment is improved.
In some embodiments, the battery compartment includes a plurality of sub-compartments arranged along a length of the case, each sub-compartment housing a first battery pack along the length of the case. Divide into a plurality of sub-warehouses with the battery compartment, all can hold first group battery in every sub-warehouse for first group battery can hold in the battery compartment more regularly, realizes the installation to the battery in the first group battery more easily.
In some embodiments, the battery compartment accommodates only one first battery pack in the height direction of the case, Y in each first battery pack 1 The batteries are distributed along the height direction of the box body, and Y is more than or equal to 2 1 And is less than or equal to 10. All batteries in the first battery pack are distributed along the height direction of the box body, so that the serial connection of all batteries in the first battery pack is facilitated. Y is set to 1 Is arranged between 2 and 10, so that Y 1 Is not too large. The number of the batteries arranged along the height direction of the box body in the battery compartment is not too large, and the space utilization rate of the battery compartment is improved.
In some embodiments, a battery cell includes a housing and at least one electrode assembly housed within the housing; the housing has a rectangular parallelepiped shape, and has a dimension W in a first direction 1 The dimension of the housing in the second direction is T 1 The dimension 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 the length direction of the box body, the other is parallel to the width direction of the box body, and the other is parallel to the height direction of the box body; the housing includes a first wall and a second wall disposed opposite each other in a first direction, a third wall and a fourth wall disposed opposite each other in a second direction,A fifth wall and a sixth wall oppositely arranged along the third direction, the sum of the thicknesses of the first wall and the second wall is a, the sum of the thicknesses of the third wall and the fourth wall is b, and the sum of the thicknesses of the fifth wall and the sixth wall is c, so that the following conditions are satisfied: (W) 1 -a)*(T 1 -b)*(K 1 -c)/(W 1 *T 1 *K 1 ) More than or equal to 90 percent. In such a battery cell, the ratio of the volume of the inner space of the case of the battery cell to the volume of the case is 90% or more, so that the inner space of the case occupies a relatively large space in which the case can be used to accommodate the electrode assembly, and the volumetric energy density of the battery cell can be improved under the same chemical system.
In some embodiments, (W) 1 -a)/W 1 ≥97.0％，(T 1 -b)/T 1 More than or equal to 96.5 percent, and (K) 1 -c)/K 1 More than or equal to 96.5 percent. In this way, the size ratio of the inner space of the housing in three directions can be increased, and the volumetric energy density of the battery cell can be further increased.
In some embodiments, the housing includes a shell having an opening and an end cap covering the opening; the shell comprises a first wall, a second wall, a third wall, a fourth wall and a fifth wall which are integrally formed, and the end cover is a sixth wall. When the battery is assembled, the electrode terminal can be firstly arranged on the end cover, then the electrode assembly is accommodated in the shell, and then the end cover is covered on the opening of the shell, so that the difficulty in arranging the electrode assembly in the shell and the difficulty in arranging the electrode terminal in the shell can be reduced.
In some embodiments, the battery cell further includes a first insulating member and a second insulating member, the first insulating member disposed between and abutting the fifth wall and the electrode assembly; the second insulating piece is arranged between the sixth wall and the electrode assembly and is abutted against the sixth wall; the first insulating member has a maximum dimension e in the third direction 1 The second insulating member has a maximum dimension e in the third direction 2 The method comprises the following steps: (W) 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 )≥88％，0.3mm≤e 1 Less than or equal to 1.2mm, and less than or equal to 2mm and less than or equal to e 2 Less than or equal to 10mm. This isThe space left for the electrode assembly inside the case is increased, allowing the electrode assembly having a larger volume to be accommodated, so that the volumetric energy density of the battery cell is further improved.
In some embodiments, the battery cell further includes a first insulating member and a second insulating member, the first insulating member disposed between and abutting the fifth wall and the electrode assembly; the second insulating piece is arranged between the sixth wall and the electrode assembly and is abutted against the sixth wall; the first insulating member has a maximum dimension e in the third direction 1 The second insulating member has a maximum dimension e in the third direction 2 The method comprises the following steps: (W) 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 )≥85％，0.3mm≤e 1 Less than or equal to 1.2mm, and less than or equal to 2mm and less than or equal to e 2 Less than or equal to 10mm. This allows the space left for the electrode assembly inside the case to be increased, allowing the electrode assembly having a larger volume to be accommodated, so that the volumetric energy density of the battery cell is further improved.
In some embodiments, W 1 ≥T 1 The first direction is parallel to the length direction of the box body, the second direction is parallel to the width direction of the box body, and the third direction is parallel to the height direction of the box body. An end cover is arranged at only one end of the shell and W 1 ≥T 1 Under the condition of the box, the end cover and the fifth wall of the shell are oppositely arranged along the height direction of the box body, the first wall and the second wall of the shell are oppositely arranged along the length direction of the box body, and the third wall and the fourth wall of the shell are oppositely arranged along the width direction of the box body, so that the volume ratio of all battery monomers in the battery compartment is improved.
In some embodiments, the housing includes a shell having two openings disposed opposite each other in the third direction, and two end caps respectively covering the two openings; the shell comprises a first wall, a second wall, a third wall and a fourth wall which are integrally formed, and the two end covers are a fifth wall and a sixth wall respectively.
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, andabutting the fifth wall; the fourth insulating piece is arranged between the sixth wall and the electrode assembly and is abutted against the sixth wall; the maximum dimension of the third insulating member in the third direction is e 3 The maximum dimension of the fourth insulating member in the third direction is e 4 The method comprises the following steps: (W) 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 )≥88％，2mm≤e 3 Less than or equal to 10mm and less than or equal to 2mm and less than or equal to e 4 Less than or equal to 10mm. This allows the space left for the electrode assembly inside the case to be increased, allowing the electrode assembly having a larger volume to be accommodated, so that the volumetric energy density of the battery cell is further improved.
In some embodiments, the battery cell further includes a third insulating member disposed between and abutting the fifth wall and the electrode assembly, and a fourth insulating member; the fourth insulating piece is arranged between the sixth wall and the electrode assembly and is abutted against the sixth wall; the maximum dimension of the third insulating member in the third direction is e 3 The maximum dimension of the fourth insulating member in the third direction is e 4 The method comprises the following steps: (W) 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 )≥85％，2mm≤e 3 Less than or equal to 10mm and less than or equal to 2mm and less than or equal to e 4 Less than or equal to 10mm. This allows the space left for the electrode assembly inside the case to be increased, allowing the electrode assembly having a larger volume to be accommodated, so that the volumetric energy density of the battery cell is further improved.
In some embodiments, W 1 ≥T 1 The first direction is parallel to the height direction of the box body, the second direction is parallel to the width direction of the box body, and the third direction is parallel to the length direction of the box body. End covers and W are arranged at two ends of the shell 1 ≥T 1 Under the condition of (1), the two end covers of the shell are arranged along the length direction of the box body, the first wall and the second wall of the shell are arranged along the height direction of the box body, and the third wall and the fourth wall of the shell are oppositely arranged along the width direction of the box body, so that the volume ratio of all battery monomers in the battery compartment is improved.
In some embodiments，3000cm 3 ≤W 1 *T 1 *K 1 ≤40000cm 3 。W 1 *T 1 *K 1 ≥3000cm 3 The wall thickness of the shell is not too small under the condition that the ratio of the volume of the inner space of the shell to the volume of the shell is more than 90%, so that the structural strength requirement of the shell can be met; w (W) 1 *T 1 *K 1 ≤40000cm 3 The capacity and current of the battery cells can be controlled within a proper range, and the risk of damage to overcurrent elements in the circuit is reduced.
In some embodiments, 3200cm 3 ≤W 1 *T 1 *K 1 ≤32000cm 3 . The requirements of the structural strength of the shell and the heating value of the battery monomer are met, the structural strength of the shell is further improved, and the risk of damage to the overcurrent element in the circuit is reduced.
In some embodiments, 3720cm 3 ≤W 1 *T 1 *K 1 ≤12500cm 3 。
In some embodiments 4000cm 3 ≤W 1 *T 1 *K 1 ≤6000cm 3 。
In some embodiments, the positive electrode material of the battery cell comprises a lithium-containing phosphate, satisfying: c is not less than 350Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is greater than or equal to 118Ah/L. In the case that the positive electrode material of the battery cell comprises lithium-containing phosphate and C is more than or equal to 350Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is set above 118Ah/L, which can increase the volume ratio of the internal space of the housing of the battery cell, and is beneficial to realizing the ratio of the volume of the internal space of the housing of the battery cell to the volume of the housing of the battery cell above 90%.
In some embodiments, the positive electrode material of the battery cell comprises a lithium transition metal oxide, satisfying: c is greater than or equal to 650Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is not less than 190Ah/L. In the case that the positive electrode material of the battery cell comprises lithium transition metal oxide and C is not less than 650Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is set at 190Ah/L or moreThe volume ratio of the inner space of the shell of the battery monomer to the volume of the shell is improved, so that the ratio of the volume of the inner space of the shell of the battery monomer to the volume of the shell is over 90 percent.
In some embodiments, the battery cell is a sodium ion battery cell, satisfying: c is greater than or equal to 260Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is not less than 87Ah/L. Under the condition that the battery monomer is sodium ion battery monomer and C is more than or equal to 260Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is set at 87Ah/L or more, which can increase the volume ratio of the internal space of the housing of the battery cell, and is beneficial to realizing the ratio of the volume of the internal space of the housing of the battery cell to the volume of the housing of the battery cell of 90% or more.
In a second aspect, an embodiment of the present application provides an energy storage system, including an energy storage converter and an energy storage device provided by any one embodiment of the M first aspects, where the energy storage device is electrically connected to the energy storage converter.
In some embodiments, m=2, a=2; or, m=4, a=4; or, m=8, a=8.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of an energy storage system provided in some embodiments of the present application;
FIG. 2 is an isometric view of an energy storage device provided in some embodiments of the present application;
fig. 3 is a schematic structural diagram of an energy storage device according to some embodiments of the present disclosure;
FIG. 4 is a schematic view of the structure of the case shown in FIG. 3;
FIG. 5 is a cross-sectional view A-A of the housing shown in FIG. 4;
fig. 6 is an exploded view of the battery shown in fig. 3;
fig. 7 is an exploded view of the battery cell shown in fig. 6;
FIG. 8 is a layout view of the batteries in the battery compartment shown in FIG. 3;
FIG. 9 is a diagram illustrating the arrangement of batteries in a battery compartment according to further embodiments of the present application;
fig. 10 is a schematic structural view of a battery provided in some embodiments of the present application;
fig. 11 is a schematic structural view of a battery according to other embodiments of the present application;
FIG. 12 is a schematic diagram of an energy storage device according to other embodiments of the present disclosure;
FIG. 13 is a schematic view of the structure of the case shown in FIG. 12;
FIG. 14 is a B-B cross-sectional view of the energy storage device shown in FIG. 12;
fig. 15 is an isometric view of a battery cell provided in some embodiments of the present application;
fig. 16 is an exploded view of the battery cell shown in fig. 15;
FIG. 17 is a cross-sectional exploded view of the battery cell shown in FIG. 15 taken along the UW plane;
FIG. 18 is a cross-sectional exploded view of the battery cell shown in FIG. 15 taken along the VW plane;
FIG. 19 is an isometric view of a battery cell provided in accordance with further embodiments of the present application;
fig. 20 is an exploded view of the battery cell shown in fig. 19;
FIG. 21 is a cross-sectional exploded view of the battery cell shown in FIG. 19 taken along the UW plane;
fig. 22 is a cross-sectional exploded view of the battery cell shown in fig. 19 taken along the VW plane.
Icon: 1-a box body; 11-a battery compartment; 111-sub-bins; 112-a separator; 113-a support; 12-a thermal management bin; 13-a main control bin; 14-an electrical bin; 2-cell; 2 a-a first battery pack; 2 b-a second battery pack; 21-battery cell; 21 a-a first battery cell stack; 21 b-a second battery cell stack; 211-a housing; 2111-a housing; 2112-end cap; 2113-a first wall; 2114-a second wall; 2115-a third wall; 2116-fourth wall; 2117-fifth wall; 2118-sixth wall; 212-electrode terminals; 213-electrode assembly; 2131-tab; 214-a first insulating member; 215-a second insulator; 216-a third insulator; 217-fourth insulator; 22-battery box; 221-a first part; 222-a second portion; 10-an energy storage device; 20-an energy storage converter; a 100-energy storage system; u-a first direction; v-a second direction; w-a third direction; the length direction of the X-box body; y-width direction of the box; z-the height direction of the box.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.
Reference in the specification to "an embodiment" 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 such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The term "and/or" in this application is merely an association relation describing an associated object, and indicates that three relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.
In the embodiments of the present application, the same reference numerals denote the same components, and in the interest of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the present application, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are illustrative only and should not be construed as limiting the present application in any way.
The term "plurality" as used herein refers to more than two (including two).
In this embodiment of the present application, the battery cell may be a secondary battery, and the secondary battery refers to a battery cell that can activate the active material by charging after discharging the battery cell and continue to use.
The battery cells include, but are not limited to, lithium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, and the like.
The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, so that the risk of short circuit of the positive electrode and the negative electrode can be reduced, and meanwhile, active ions can pass through the separator.
In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.
As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.
As an example, the positive electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, surface-silver-treated aluminum, surface-silver-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used. These positive electrode active materials may be used alone or in combination of two or more.
In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.
As an example, the negative electrode current collector may employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, silver-surface-treated aluminum or stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The foam metal can be foam nickel, foam copper, foam aluminum, foam alloy, foam carbon or the like. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).
As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.
As an example, the anode current collector has two surfaces opposing in its own thickness direction, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.
As an example, a negative active material for a battery cell, which is well known in the art, may be used. As an example, the anode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, and the like. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxide, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery anode active material may be used. These negative electrode active materials may be used alone or in combination of two or more.
In some embodiments, the material of the positive electrode current collector may be aluminum and the material of the negative electrode current collector may be copper.
In some embodiments, the electrode assembly is a rolled structure.
In some embodiments, the electrode assembly is a lamination stack.
The energy storage device 10 is a device in which a plurality of battery cells 21 are integrated in a case 1, and the plurality of battery cells 21 are connected in series, parallel, or series-parallel to store electric energy. The energy storage device 10 may be used in an electrical power system to store excess electrical energy during peak hours of use to supplement peak hours of use.
The energy storage device 10 is generally required to be connected to the energy storage converter 20, and external equipment (such as a power grid) can change electric energy from ac to dc through the energy storage converter 20 to store the electric energy in the energy storage device 10, so as to realize charging of the energy storage device 10, and the energy storage device 10 can also change the electric energy from dc to ac through the energy storage converter 20 to supply power to the external equipment, so as to realize discharging of the energy storage device 10. For a typical energy storage device 10, the matching problem between the energy storage device 10 and the energy storage converter 20 is not considered, a sufficient power margin is not set for the energy storage device 10, and the energy storage device 10 needs to be subjected to capacity compensation in a short time, for example, a plurality of battery cells 21 are added on the basis of the original energy storage device 10, so as to achieve the purpose of capacity compensation. Such an energy storage device 10 has poor power matching with the energy storage converter 20.
In view of this, the embodiment of the present application provides an energy storage device 10 for electrically connecting an energy storage converter 20, where the energy storage converter 20 can be used to cooperate with M energy storage devices 10, M is a positive integer, the rated output power of the energy storage converter 20 is P, the unit is W, the energy of the energy storage device 10 is Q, the unit is Wh, the duration of discharging the energy storage device 10 from the full charge state to the full discharge state is a, the unit is h, and P/(m×q/a) is set in the range of 0.7-0.99. In this way, the long-term reliability and economy of the energy storage device 10 are considered, and the power matching property of the energy storage device 10 and the energy storage converter 20 is improved.
The energy storage device 10 described in the embodiments of the present application is applicable to the energy storage system 100.
Referring to fig. 1, fig. 1 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), the energy storage device 10 being electrically connected to the energy storage converter 20.
The energy storage converter 20 is a device for connecting an external device and the energy storage device 10, and the external device may be a power grid, electric equipment, and the like. The energy storage converter 20 has a dc side for electrical connection with the energy storage device 10 and an ac side for connection with external equipment.
In the charging state of the energy storage device 10, the energy storage converter 20 serves as a rectifier to store electric energy in the energy storage device 10 from ac side ac to dc, and in the discharging state of the energy storage device 10, the energy storage converter 20 serves as an inverter to transfer the electric energy stored in the energy storage device 10 from dc side dc to ac to an external device.
In the energy storage system 100, one energy storage converter 20 may be provided with one energy storage device 10, or a plurality of energy storage devices 10 may be provided. In embodiments in which one energy storage converter 20 is provided with a plurality of energy storage devices 10, the energy storage devices 10 may be two, three, four, five, six, seven, eight or more. As an example, in fig. 1, one energy storage converter 20 is electrically connected to four energy storage devices 10.
The specific structure of the energy storage device 10 according to the embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Referring to fig. 2, fig. 2 is an isometric view of an energy storage device 10 according to some embodiments of the present disclosure; the embodiment of the application provides an energy storage device 10, be used for electrically connecting energy storage converter 20, energy storage converter 20 can be used for cooperating with M energy storage device 10, and M is positive integer, and energy storage converter 20's rated output is P, and the unit is W, and energy storage device 10's energy is Q, and the unit is Wh, and energy storage device 10 is from full charge state to the duration of full discharge state for A, and the unit is h, satisfies: P/(M.times.Q/A) is less than or equal to 0.7 and less than or equal to 0.99.
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 denoted by P and is expressed in terms of "watts", abbreviated as "watts", and the symbol "W". The energy of the energy storage device 10 is denoted by Q in "watt-hours" and the symbol "Wh". The time period for which the energy storage device 10 is discharged from the full charge state to the full discharge state is denoted by a and is expressed as "hour" and the symbol "h".
It will be appreciated that when the energy storage device 10 is fully charged, the energy storage device 10 is in a fully charged state; when the electric quantity of the energy storage device 10 is discharged, the energy storage device 10 is in a full discharge state. The time period for which the energy storage device 10 is discharged from the full charge state through the energy storage converter 20 to the full discharge state is denoted by a and is expressed by the symbol "hour".
M may be 1, 2, 3, 4, 5, 6, 7, 8, etc. M may be equal to A, or M may be greater than A, or M may be less than A.
M Q represents the total energy of the M energy storage devices 10 associated with the energy storage converter 20, and M Q/a represents the power of the M energy storage devices 10 associated with the energy storage converter 20.
P/(m×q/a) may be a point value of any one of 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, or the like or a range value between any two.
In the embodiment of the present application, P/(m×q/a). Ltoreq.0.99, so that the power of all the energy storage devices 10 matched with the energy storage converter 20 has enough margin compared with the power of the energy storage converter 20, and the capacity of the energy storage devices 10 is not required to be increased in a longer time, thereby realizing the long-term reliability of the energy storage devices 10; P/(M.times.Q/A). Gtoreq.0.7, so that the margin of the power of the energy storage device 10 compared with the power of the energy storage converter 20 is not excessive, the power waste is reduced, and the economical efficiency of the energy storage device 10 is improved. In this way, the power matching between the energy storage device 10 and the energy storage converter 20 is improved from the viewpoint of long-term reliability and economy of the energy storage device 10.
The following is a specific description by experimental data:
TABLE 1
From the above table 1, it is apparent from comparative examples 1 to 9 and comparative example 1 that when P/(m×q/a). Ltoreq.0.99, the period of capacity augmentation of the energy storage device 10 is long, and the capacity augmentation of the energy storage device 10 is not required in a short time, so that the long-term reliability of the energy storage device 10 can be realized.
In some embodiments, 0.75.ltoreq.P/(M.times.Q/A). Ltoreq.0.95.
In this embodiment, P/(m×q/a) may be a point value of any one of 0.75, 0.78, 0.8, 0.83, 0.85, 0.88, 0.9, 0.93, 0.95, or the like or a range value therebetween.
In this embodiment, P/(m×q/a) is 0.75-0.95, which gives consideration to the long-term reliability and economy of the energy storage device 10, so that the cost of the energy storage device 10 can be controlled to a low level, and the capacity supplement period of the energy storage device 10 can be increased.
In some embodiments, 0.85.ltoreq.P/(M.times.Q/A). Ltoreq.0.93.
In this embodiment, P/(m×q/a) may be a point value of any one of 0.85, 0.86, 0.87, 0.88, 0.89, 0.9, 0.91, 0.92, 0.93, or the like, or a range value therebetween.
In this embodiment, P/(m×q/a) is 0.85 or less and 0.93 or less, which further combines the long-term reliability and economy of the energy storage device 10, so that the cost of the energy storage device 10 can be further controlled to be low, and the capacity supplement period of the energy storage device 10 can be further increased.
In some embodiments, referring to fig. 3-6, fig. 3 is a schematic structural diagram of an energy storage device 10 according to some embodiments of the present disclosure; fig. 4 is a schematic structural view of the case 1 shown in fig. 3; fig. 5 is a sectional view A-A of the case 1 shown in fig. 4; fig. 6 is an exploded view of the battery 2 shown in fig. 3. The energy storage device 10 comprises a housing 1 and at least one battery 2, the housing 1 comprises a battery compartment 11, the at least one battery 2 is accommodated in the battery compartment 11, and the battery 2 comprises at least one battery cell 21. The capacity of the battery cell 21 is C, the unit is Ah, and the platform voltage of the battery cell 21 is U 0 The unit is V, the number of the battery cells 21 in the battery compartment 11 is N, q=n×c×u 0 。
The capacity of the battery cell 21 is denoted by C in "ampere hour" and the symbol "Ah". U for platform voltage of battery cell 21 0 Expressed in units of "volts", abbreviated as "volts", and the symbol "V". The plateau voltage is a voltage value corresponding to the case where the change in the voltage of the battery cell 21 is minimum and the change in the capacity is large.
The case 1 may be a standard member that satisfies international standards set by the international organization for standardization ISO, or may be a nonstandard member. The container 1 may also be referred to as a container and the energy storage device 10 may also be referred to as an energy storage container. The case 1 may have various shapes, such as a cylinder shape, a prismatic shape. As an example, in fig. 3, the case 1 has a quadrangular prism shape, and specifically, the case 1 has a rectangular parallelepiped shape.
The battery compartment 11 is a space inside the case 1 for accommodating the battery 2, and the battery compartment 11 may accommodate only the battery 2, or may accommodate other components other than the battery 2, such as fire-fighting components, which may include pipes, detectors, and the like. The battery compartment 11 may be of various shapes, such as a cylindrical shape, a prismatic shape, etc. The prism may be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. As an example, in fig. 3 to 5, the battery compartment 11 has a quadrangular prism shape, and specifically, the battery 2 has a rectangular parallelepiped shape. Taking the battery compartment 11 as a rectangular parallelepiped, an opening is formed in at least one side of the battery compartment 11 along the width direction Y of the case, and the battery 2 can enter the battery compartment 11 through the opening. Door leaves can be correspondingly arranged on the opening side of the battery compartment 11, and can be connected with the box body 1 in a sliding manner, a hinge manner and the like so as to open or close the opening in a sliding or rotating manner.
Only the battery compartment 11 may be formed in the case 1, and a space for accommodating other components may be formed in the case 1 in addition to the battery compartment 11. As an example, the cabinet 1 may further include a thermal management bin 12 and a master bin 13. The thermal management bin 12 may house a water-cooled unit for providing a fluid medium to a thermal management component, which may be a water-cooled plate disposed within the battery bin 11 for managing the temperature of the battery cells 21. The main control cabin 13 may be used to house a main control unit for high voltage control and communication of the plurality of battery cells 21 within the battery cabin 11. Wherein, box 1 is cuboid form, and battery compartment 11 and master control storehouse 13 are arranged along the direction of height Z of box, and thermal management storehouse 12 can be located battery compartment 11 along the one side of the length direction X of box, along the direction of height Z of box, and master control storehouse 13 can be located the bottom of battery compartment 11. In other embodiments, the enclosure 1 may further include an electrical compartment 14, and the electrical compartment 14 may be configured to house a bus unit, a power distribution unit, and a control unit. The converging unit is used for converging the plurality of batteries 2 and realizing safe connection between the plurality of batteries 2 and the direct current side of the energy storage converter 20. The power distribution unit can take power from the power grid and is used for supplying power to the internal control system and the auxiliary system; the control unit may include a battery cell 21 management unit, a fire control unit, etc. for detecting and managing the inside of the energy storage device 10. The electric bin 14 and the thermal management bin 12 may be integrally located at one side of the battery bin 11 along the length direction X of the case, and the electric bin 14 and the thermal management bin 12 may be arranged along the width direction Y of the case.
The number of the batteries 2 in the battery compartment 11 may be one or more, and the number of the battery cells 21 in the batteries 2 may be one or more. The batteries 2 in the battery bin 11 can be connected in series, in parallel or in series-parallel, and the battery monomers 21 in the batteries 2 can also be connected in series, in parallel or in series-parallel, wherein the series-parallel refers to the existing series connection and the parallel connection.
It will be appreciated that if the cells 21 in each battery 2 are equal, the number N of 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 cells 21 in the battery 2. If there is one battery 2 in the battery compartment 11, there is one battery cell 21 in the battery 2, and only one battery cell 21, n=1, is accommodated in the battery compartment 11.
Along the length direction X of the box body, the battery compartment 11 can accommodate one battery 2, and can also accommodate a plurality of batteries 2; along the width direction Y of the case, the battery compartment 11 may accommodate one battery 2, or may accommodate a plurality of batteries 2; along the height of the case 1, the battery compartment 11 may accommodate one battery 2, or may accommodate a plurality of batteries 2. The battery 2 may be rectangular parallelepiped, and after the battery 2 is accommodated in the battery compartment 11, one of the longitudinal direction, the width direction, and the height direction of the battery 2 may be parallel to the longitudinal direction X of the case, the other may be parallel to the width direction Y of the case, and the other may be parallel to the height direction Z of the case. As an example, in the embodiment shown in fig. 3, the battery compartment 11 accommodates a plurality of batteries 2 along the length direction X of the case; along the height direction Z of the box body, a battery compartment 11 accommodates a plurality of batteries 2; along the width direction Y of the case, the battery compartment 11 accommodates only one battery 2, the length direction of the battery 2 is parallel to the width direction Y of the case, the width direction of the battery 2 is parallel to the length direction X of the case, and the height direction of the battery 2 is parallel to the height direction Z of the case.
In this embodiment, q=n×c×u 0 The capacities of all the battery cells 21 in the battery compartment 11 are equal, and the battery cells 21 with the same specification can be selected. On the one hand, is favorable for improving the energy storage deviceThe assembly efficiency of the device 10; on the other hand, the probability of space waste due to the different specifications of the battery cells 21 in the battery compartment 11 can be reduced.
In some embodiments, the battery 2 may be a battery module, for example, the battery cells 21 in the battery 2 are plural, and the plural battery cells 21 are arranged and fixed to form one battery module. In the battery module, a frame body may be formed by two side plates and two end plates, and the battery cells 21 are fixed in the frame body to form the battery module.
In other embodiments, as shown in fig. 6, the battery 2 may also be a battery pack, and the battery 2 may further include a battery box 22, and the battery cell 21 is accommodated in the battery box 22. If the number of the battery cells 21 in the battery 2 is plural, the plural battery cells 21 may be arranged in an array in the battery box 22. The battery case 22 may include a first portion 221 and a second portion 222, and the first portion 221 and the second portion 222 are overlapped with each other to define an accommodating space for accommodating the battery cell 21. The first portion 221 and the second portion 222 may have various shapes, such as a rectangular parallelepiped shape, a cylindrical shape, and the like. The first portion 221 may be a hollow structure with one side opened, and the second portion 222 may be a hollow structure with one side opened, and the open side of the second portion 222 is closed to the open side of the first portion 221, thereby forming the battery case 22 having the receiving space. The first portion 221 may be a hollow structure with one side open, the second portion 222 may be a plate-like structure, and the second portion 222 may be covered on the open side of the first portion 221 to form the battery box 22 having the accommodation space. The first portion 221 and the second portion 222 may be sealed by a sealing element, which may be a sealing ring, a sealant, or the like.
In some embodiments, referring to fig. 7, fig. 7 is an exploded view of the battery cell 21 shown in fig. 6. The battery cell 21 may include a case 211, an electrode assembly 213, and an electrode terminal 212. The electrode terminal 212 is provided to the case 211, and the electrode terminal 212 is electrically connected to the electrode assembly 213.
The case 211 is a member for accommodating the electrode assembly 213, the electrolyte, and the like. The housing 211 may be cylindrical or prismatic. The prism includes a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. The quadrangular prism includes an oblique quadrangular prism, a right parallelepiped, and the like. The parallelepiped includes a rectangular parallelepiped, a square, and the like. As an example, the housing 211 may include a housing 2111 and an end cap 2112.
The housing 2111 may be a hollow structure having one end formed to be open, or the housing 2111 may be a hollow structure having opposite ends formed to be open. The housing 2111 may be a variety of shapes, such as cylindrical, prismatic, etc. The housing 2111 may be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc.
The end cap 2112 is a member closing the opening of the case 2111 to isolate the inner environment of the battery cell 21 from the outer environment. The end cap 2112 defines an accommodation space for accommodating the electrode assembly 213, electrolyte, and other components together with the case 2111. The shape of the end cover 2112 may be adapted to the shape of the housing 211, for example, the housing 2111 is a rectangular parallelepiped structure, the end cover 2112 is a rectangular plate structure adapted to the housing 211, for example, the housing 2111 is a cylindrical structure, and the end cover 2112 is a circular plate structure adapted to the housing 2111. The material of the end cap 2112 may be various, for example, copper, iron, aluminum, steel, aluminum alloy, plastic, etc., and the material of the end cap 2112 may be the same as or different from that of the housing 2111.
In embodiments where housing 2111 is open at one end, end caps 2112 may be provided one for each. In embodiments where the housing 2111 is open at opposite ends, two end caps 2112 may be provided, with the two end caps 2112 closing the two openings of the housing 2111, respectively, and the two end caps 2112 and the housing 2111 together defining a receiving space.
The electrode terminals 212 are members for inputting or outputting electric energy in the battery cells 21. The electrode terminal 212 is provided on the case 211, and the electrode terminal 212 is electrically connected to the tab 2131 of the electrode assembly 213. The electrode terminal 212 may be provided on the case 2111 of the housing 211 or may be provided on the end cap 2112 of the housing 211. The electrode terminal 212 and the tab 2131 may be directly connected, for example, the electrode terminal 212 and the tab 2131 may be directly welded; the electrode terminal 212 and the tab 2131 may be indirectly connected through a current collecting member, which may be a metal conductor such as copper, iron, aluminum, steel, aluminum alloy, or the like.
As an example, as shown in fig. 7, the case 2111 has a hollow structure with one end formed with an opening, only one end cap 2112 is provided in the case 211, the end cap 2112 closes the opening of the case 2111, two electrode terminals 212 are provided on the end cap 2112, the electrode terminals 212 partially protrude from the outer surface of the end cap 2112, a positive electrode tab 2131 and a negative electrode tab 2131 are formed at one end of the electrode assembly 213 facing the end cap 2112, and the positive electrode tab 2131 and the negative electrode tab 2131 are electrically connected to the two electrode terminals 212, respectively.
Taking the case 211 of the battery cell 21 as an example of a rectangular parallelepiped shape, the case 211 has a length direction, a width direction, and a height direction, the length of the case 211 is greater than or equal to the width of the case 211, and the electrode terminal 212 is located at one end of the case 211 in the height direction. After the battery 2 is accommodated in the battery compartment 11, one of the longitudinal direction, the width direction, and the height direction of the housing 211 may be parallel to the longitudinal direction X of the casing, the other may be parallel to the width direction Y of the casing, and the other may be parallel to the height direction Z of the casing.
In some embodiments, referring to fig. 8-10, fig. 8 is a layout diagram of the battery 2 in the battery compartment 11 shown in fig. 3; fig. 9 is a layout diagram of the battery 2 in the battery compartment 11 according to other embodiments of the present application; fig. 10 is a schematic structural view of a battery 2 according to some embodiments of the present application; fig. 11 is a schematic structural view of a battery 2 according to other embodiments of the present application. The battery compartment 11 accommodates N 1 The cells 2, N 1 The individual cells 2 are denoted by X 1 A plurality of parallel-connected first battery packs 2a, each first battery pack 2a being formed of Y 1 The individual cells 2 are connected in series; or, N 1 The individual cells 2 are defined by Y 1 A plurality of second battery packs 2b connected in series, each second battery pack 2b being formed of X 1 The individual cells 2 are connected in parallel to satisfy: n (N) 1 ≥1，X 1 ≥1，Y 1 ≥1，N 1 ＝X 1 *Y 1 . The battery 2 includes N 2 Individual battery cells 21, N 2 Each battery cell 21 is formed by X 2 A plurality of parallel-connected first battery cell groups 21a, each first battery cell group 21a being formed of Y 2 The individual battery cells 21 are connected in series; or, N 2 Individual cellBody 21 is formed by Y 2 A plurality of second battery cell groups 21b connected in series, each second battery cell group 21b being formed of X 2 The individual battery cells 21 are connected in parallel to form: n (N) 2 ≥1，X 2 ≥1，Y 2 ≥1，N 2 ＝X 2 *Y 2 ，N＝N 1 *N 2 。
X 1 The parallel number Y of the batteries 2 in the battery compartment 11 1 The number of series connection of the batteries 2 in the battery compartment 11. X is X 2 The parallel number of the battery cells 21 in the battery 2, Y 2 The number of series connection of the battery cells 21 in the battery 2. N (N) 1 、N 2 、X 2 、Y 2 And is an integer greater than or equal to 1.
If X 1 ＝1，N 1 The individual cells 2 are denoted by X 1 The first battery groups 2a connected in parallel are formed to be equivalent to N 1 Each cell 2 is formed of 1 first battery group 2 a; each second battery group 2b is formed by X 1 The formation of the parallel connection of the individual cells 2 is equivalent to each of the second battery groups 2b being formed of 1 cell 2. If Y 1 =1, each first battery group 2a is formed by Y 1 The series connection of the individual cells 2 is formed equivalent to each first battery group 2a being formed of 1 cell 2; n (N) 1 The individual cells 2 are defined by Y 1 The second battery groups 2b connected in series are formed to be equivalent to N 1 Each cell 2 is formed of 1 second battery group 2 b.
If X 2 ＝1，N 2 Each battery cell 21 is formed by X 2 The first cell groups 21a connected in parallel are formed to be equal to N 2 Each battery cell 21 is formed of 1 first battery cell group 21 a; each second battery cell group 21b is formed by X 2 The individual battery cells 21 are connected in parallel to form an equivalent to each of the second battery cell groups 21b being formed of 1 battery cell 21. If Y 2 =1, each first cell group 21a is formed by Y 2 The series connection of the individual battery cells 21 is formed equivalent to each of the first battery cell groups 21a being formed of 1 battery cell 21; n (N) 2 Each battery cell 21 is formed by Y 2 The second battery cell groups 21b connected in series are formed to be equivalent to N 2 Each battery cell 21 is formed of 1 second battery cell group 21 b.
In FIG. 8, it is shownIn the embodiment shown, N 1 The individual cells 2 are denoted by X 1 A plurality of parallel-connected first battery packs 2a, each first battery pack 2a being formed of Y 1 The individual cells 2 are formed in series. By way of example, X 1 ＝4，Y 1 ＝8。
In the embodiment shown in FIG. 9, N 1 The individual cells 2 are defined by Y 1 A plurality of second battery packs 2b connected in series, each second battery pack 2b being formed of X 1 The individual cells 2 are connected in parallel. By way of example, X 1 ＝4，Y 1 ＝8。
In the embodiment shown in FIG. 10, N 2 Each battery cell 21 is formed by X 2 A plurality of parallel-connected first battery cell groups 21a, each first battery cell group 21a being formed of Y 2 The individual battery cells 21 are formed in series. The battery box 22 has a plurality of battery cells 21, the plurality of battery cells 21 are distributed in an array, each row of battery cells 21 is arranged along the length direction X of the box body, and each row of battery cells 21 is arranged along the width direction Y of the box body. As an example, all the battery cells 21 in each two columns of battery cells 21 are connected in series to form one of the first battery cell groups 21a. Specifically, the battery cells 21 in the battery box 22 are arranged in 26 rows and 4 columns, X 2 ＝2，Y 2 ＝52。
In the embodiment shown in FIG. 11, N 2 Each battery cell 21 is formed by Y 2 A plurality of second battery cell groups 21b connected in series, each second battery cell group 21b being formed of X 2 The individual battery cells 21 are connected in parallel. The battery box 22 has a plurality of battery cells 21, the plurality of battery cells 21 are distributed in an array, each row of battery cells 21 is arranged along the length direction X of the box body, and each row of battery cells 21 is arranged along the width direction Y of the box body. As an example, in each column of the battery cells 21, every two battery cells 21 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, X 2 ＝2，Y 2 ＝52。
In the present embodiment, for N in the battery compartment 11 1 The cells 2 may be formed by first selecting Y 1 The cells 2 are connected in series to form a first battery group 2a, and then X is used for 1 The first battery packs 2a are connected in parallelConnecting; or may be formed by X 1 The batteries 2 are connected in parallel to form a second battery group 2b, and Y is used for 1 The second battery packs 2b are connected in series. For N in battery 2 2 The individual cells 21 may be first formed from Y 2 The battery cells 21 are connected in series to form a first battery cell group 21a, and then X is used for forming a battery cell group 2 The first cell groups 21a are connected in parallel; may also be represented by X 2 The battery cells 21 are connected in parallel to form a second battery cell group 21b, and Y is used for 2 The second cell groups 21b are connected in series. The serial number Y of the batteries 2 in the battery compartment 11 can be set according to the requirements 1 Number Y of series connection with battery cell 21 of battery 2 2 To adjust the voltage of the energy storage device 10 to within a reasonable range.
In some embodiments, the maximum operating voltage of the dc side of the energy storage converter 20 is U when the energy storage device 10 is charged 1 The minimum operating voltage on the dc side of the energy storage converter 20 is U 2 The method comprises the following steps: u (U) 2 ＜U 0 *Y 1 *Y 2 ＜U 1 。
When the external device charges the energy storage device 10 through the energy storage converter 20, the operating voltage of the dc side of the energy storage converter 20 may gradually change with the charging condition of the energy storage device 10, for example, the operating voltage of the dc side of the energy storage converter 20 gradually increases. U (U) 1 For maximum operating voltage of energy storage converter 20 during charging, U 2 Which is the minimum operating voltage of the energy storage converter 20 in the charged state.
Wherein U is 0 *Y 1 *Y 2 Is the voltage of the energy storage device 10.
In the present embodiment, U 0 *Y 1 *Y 2 ＜U 1 The external equipment can be normally charged into the energy storage device 10 through the energy storage converter 20; u (U) 0 *Y 1 *Y 2 ＞U 2 It is possible to realize that the energy storage device 10 supplies power to the external equipment through the energy storage converter 20. So will U 0 *Y 1 *Y 2 Controlled at U 2 ～U 1 The voltage of the energy storage converter 20 is matched with the voltage of the energy storage converter 20, so that external equipment can be realizedCharging the energy storage device 10 by the energy storage converter 20 may also be achieved in that the energy storage device 10 supplies power to external equipment via the energy storage converter 20.
In some embodiments, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, 2.8 V.ltoreq.U 0 ≤3.6V，250≤Y 1 *Y 2 ≤468。
Lithium-containing phosphates include, but are not limited to: at least one of lithium iron phosphate (such as LiFePO4 (which may also be abbreviated as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4), a composite material of lithium manganese phosphate and carbon, lithium manganese phosphate, and a composite material of lithium manganese phosphate and carbon.
In the present embodiment, U 0 The value may be any one of a point value of 2.8V, 2.9V, 3V, 3.1V, 3.2V, 3.3V, 3.4V, 3.5V, 3.6V, etc., or a range value between any two. Y is Y 1 *Y 2 May be a point value of any one of 250, 256, 280, 288, 300, 304, 320, 336, 360, 384, 400, 416, 440, 468, etc., or a range value therebetween.
In the present embodiment, when the positive electrode material of the battery cell 21 includes lithium-containing phosphate, 2.8 V.ltoreq.U 0 ≤3.6V，250≤Y 1 *Y 2 The voltage of the energy storage converter 20 can be controlled within a reasonable range not only so that the voltage of the energy storage device 10 is not too low, the energy storage device 10 can be matched with the energy storage converter 20 with higher working voltage, but also so that the voltage of the energy storage device 10 is not too high, the requirement on the working voltage of the energy storage converter 20 is reduced, and the production cost is reduced.
In some embodiments, the positive electrode material of the battery cell 21 includes lithium iron phosphate, 3.1 V.ltoreq.U 0 ≤3.3V，400≤Y 1 *Y 2 ≤424。
In the present embodiment, U 0 The value may be any one of 3.1V, 3.13V, 3.15V, 3.18V, 3.2V, 3.23V, 3.25V, 3.28V, 3.3V, etc., or a range between any two. Y is Y 1 *Y 2 May be a point value of any one of 400, 404, 408, 412, 416, 420, 424, etc., or a range value therebetween.
In the present embodiment, when the positive electrode material of the battery cell 21 includes lithium iron phosphate, 3.1 V.ltoreq.U 0 ≤3.3V，400≤Y 1 *Y 2 And 424, the voltage of the energy storage converter 20 can be controlled within a reasonable range.
In some embodiments, 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 ≤18。
P may be 3.5 x 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 A point value of any one of W and the like or a range value between any two. X is X 1 *X 2 May be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
In this embodiment, the positive electrode material in the cell 21 comprises lithium-containing phosphate, 3.5 x 10 6 W≤P≤7.5*10 6 W, and m=a, X may be 1 *X 2 Is set in the range of 1 to 18 to control the capacity of the battery cell 21 within a reasonable range.
In some embodiments, X 1 ＝1。
It will be appreciated that in embodiments in which a plurality of batteries 2 are housed within the battery compartment 11, all of the batteries 2 in the battery compartment 11 are connected in series.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, X 2 May be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
In some embodiments, X 2 ＝1，2000Ah≤C≤11000Ah。
In the present embodiment, X 1 ＝1，X 2 The value of c may be any one of 2000Ah, 3000Ah, 4000Ah, 5000Ah, 6000Ah, 7000Ah, 8000Ah, 9000Ah, 10000Ah, 11000Ah, or the like, or a range therebetweenValues.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, and the parallel number X of the batteries 2 in the battery compartment 11 1 Parallel X with cell 21 of battery 2 2 In the case of 1, the capacity of the battery cell 21 is set in the range of 2000Ah to 11000Ah, so that the power matching requirement of the energy storage device 10 can be met, and the voltage requirement of the energy storage device 10 can be met.
In some embodiments, 2500 Ah.ltoreq.C.ltoreq.6000 Ah.
In the present embodiment, X 1 =1, and X 2 =1. C may be any one of point values or a range between any two of 2500Ah, 2800Ah, 3000Ah, 3300Ah, 3500Ah, 3800Ah, 4000Ah, 4300Ah, 4500Ah, 4800Ah, 5000Ah, 5300Ah, 5500Ah, 5800Ah, 6000Ah, and the like.
In some embodiments, X 2 ＝2，1000Ah≤C≤5500Ah。
In the present embodiment, X 1 =1, and X 2 =2. C may be any one of point values or a range between any two of point values 1000Ah, 1500Ah, 2000Ah, 2500Ah, 3000Ah, 3500Ah, 4000Ah, 4500Ah, 5000Ah, and the like.
The positive electrode material of the battery cell 21 comprises lithium-containing phosphate, and the parallel connection number X of the batteries 2 in the battery bin 11 1 Number X of parallel connection of battery cells 21 of 1 and battery 2 2 In the case of 2, the capacity of the battery cell 21 is set within the range of 1000Ah to 5500Ah, so that the power matching requirement of the energy storage device 10 can be satisfied, and the voltage requirement of the energy storage device 10 can be satisfied.
In some embodiments, 2000 Ah.ltoreq.C.ltoreq.4000 Ah.
In the present embodiment, X 1 =1, and X 2 =2. C may be any one of point values or a range between any two of point values of 2000Ah, 2100Ah, 2200Ah, 2300Ah, 2400Ah, 2500Ah, 2600Ah, 2700Ah, 2800Ah, 2900Ah, 3000Ah, 3100Ah, 3200Ah, 3300Ah, 3400Ah, 3500Ah, 3600Ah, 3700Ah, 3800Ah, 3900Ah, 4000Ah, and the like.
In some embodiments, 2.ltoreq.X 1 ≤6。
In the present embodiment, X 1 May be 2, 3, 4, 5, 6.
In the present embodiment, the positive electrode material of the battery cell 21 comprises lithium-containing phosphate, and the parallel number X of the batteries 2 in the battery compartment 11 1 Controlled within a reasonable range, X 1 Not less than 2, so that the capacity of the battery monomer 21 is not too large, the manufacturing difficulty and the manufacturing cost of the battery monomer 21 are reduced, and X 1 6. Ltoreq.6 the parallel number X of the batteries 2 in the battery compartment 11 1 Is not excessive, and is beneficial to improving the space utilization rate of the battery compartment 11.
In some embodiments, X 1 ＝4，X 2 ＝1，500Ah≤C≤2600Ah。
In this embodiment, C may be a point value of any one of 500Ah, 800Ah, 1000Ah, 1300Ah, 1500Ah, 1800Ah, 2000Ah, 2300Ah, 2500Ah, 2600Ah, or the like, or a range value between any two of them.
In the present embodiment, the positive electrode material in the battery cell 21 includes lithium-containing phosphate, and X 1 ＝4，X 2 In the case of =1, the capacity of the battery cell 21 is set in the range of 500Ah to 2600Ah, so that the power matching requirement of the energy storage device 10 can be satisfied, and the voltage requirement of the energy storage device 10 can be satisfied.
In some embodiments, 800Ah C is less than or equal to 1500Ah.
In the present embodiment, X 1 ＝4，X 2 The value of c=1 may be any one of the point values of 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, or the like, or a range value between any two.
In some embodiments, X 1 ＝4，X 2 ＝2，250Ah≤C≤1300Ah。
In this embodiment, C may be a point value of any one of 250Ah, 300Ah, 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, or the like, or a range value between any two.
In the present embodiment, the positive electrode material in the battery cell 21 includes lithium-containing phosphate, and X 1 ＝4，X 2 Case of =2The capacity of the battery cell 21 is set within the range of 800Ah to 1500Ah, so that the power matching requirement of the energy storage device 10 can be met, and the voltage requirement of the energy storage device 10 can be met.
In some embodiments, 350 Ah.ltoreq.C.ltoreq.1000 Ah.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, X 1 ＝4，X 2 The value of c=2 may be any one of the point values or a range between any two of 350Ah, 400Ah, 450Ah, 500Ah, 550Ah, 600Ah, 650Ah, 700Ah, 750Ah, 800Ah, 850Ah, 900Ah, 950Ah, 1000Ah, and the like.
In some embodiments, 500 Ah.ltoreq.C.ltoreq.700 Ah.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium-containing phosphate, X 1 ＝4，X 2 The value of c=2 may be any one of the point values of 500Ah, 530Ah, 550Ah, 580Ah, 588Ah, 600Ah, 630Ah, 650Ah, 680Ah, 700Ah, or the like or a range value between any two.
In some embodiments, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, 2.8 V.ltoreq.U 0 ≤4.35V，210≤Y 1 *Y 2 ≤530。
Lithium transition metal oxides include, but are not limited to: lithium cobalt oxide (e.g. LiCoO) 2 ) Lithium nickel oxide (e.g. LiNiO) 2 ) Lithium manganese oxide (e.g. LiMnO 2 、LiMn2O 4 ) Lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (e.g., liNi) 1/3 Co 1/3 Mn 1/3 O 2 (also referred to as NCM) 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (also referred to as NCM) 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (also referred to as NCM) 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (also referred to as NCM) 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (also referred to as NCM) 811 ) Lithium nickel cobalt aluminum oxide (e.g. LiNi 0.85 Co 0.15 Al 0.05 O 2 ) And at least one of its modified compounds and the like.
In the present embodiment, U 0 May be any one of a point value 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. Y is Y 1 *Y 2 May be any of the point values or range values between any of 210, 224, 240, 250, 256, 280, 288, 300, 304, 320, 336, 360, 384, 400, 416, 440, 468, 480, 496, 512, 530, etc.
In the present embodiment, when the positive electrode material of the battery cell 21 includes lithium transition metal oxide, 2.8 V.ltoreq.U 0 ≤4.35V，210≤Y 1 *Y 2 And less than or equal to 530, the voltage of the energy storage converter 20 can be controlled within a reasonable range, so that the voltage of the energy storage device 10 is not too low, the energy storage device 10 can be matched with the energy storage converter 20 with higher working voltage, the voltage of the energy storage device 10 is not too high, the requirement on the working voltage of the energy storage converter 20 is reduced, and the production cost is reduced.
In some embodiments, 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 ≤18。
In this embodiment, P may be 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 A point value of any one of W and the like or a range value between any two. X is X 1 *X 2 May be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
In the present embodiment, the positive electrode material in the battery cell 21 comprises a lithium transition metal oxide, 3.5×10 6 W≤P≤7.5*10 6 W, and m=a, X may be 1 *X 2 Is set in the range of 1 to 18 to control the capacity of the battery cell 21 within a reasonable range.
In some embodiments, X 1 ＝1。
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, X 2 May be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
In some embodiments, X 2 ＝1，1500Ah≤C≤13400Ah。
In the present embodiment, X 1 ＝1，X 2 The value of c=1 may be any one of the point values or a range between any two of 1500Ah, 1800Ah, 2000Ah, 3000Ah, 4000Ah, 5000Ah, 6000Ah, 7000Ah, 8000Ah, 9000Ah, 10000Ah, 11000Ah, 12000Ah, 13000Ah, 13400Ah, and the like.
The positive electrode material of the battery cell 21 comprises lithium transition metal oxide, and the parallel number X of the batteries 2 in the battery compartment 11 1 Parallel X with cell 21 of battery 2 2 In the case of 1, the capacity of the battery cell 21 is set within the range of 1500Ah to 13400Ah, so that the power matching requirement of the energy storage device 10 can be met, and the voltage requirement of the energy storage device 10 can be met.
In some embodiments, 3000 Ah.ltoreq.C.ltoreq.7000 Ah.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, X 1 =1, and X 2 =1. C may be any one of point values or a range between any two of point values of 3000Ah, 3300Ah, 3500Ah, 3800Ah, 4000Ah, 4300Ah, 4500Ah, 4800Ah, 5000Ah, 5300Ah, 5500Ah, 5800Ah, 6000Ah, 6300Ah, 6500Ah, 6800Ah, 7000Ah, and the like.
In some embodiments, X 2 ＝2，750Ah≤C≤6670Ah。
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, X 1 =1, and X 2 =2. C may be 750Ah, 850Ah, 1000Ah, 1500Ah, 2000Ah, 2500Ah, 3000Ah, 3500Ah, 4000Ah, 4500Ah, 5000Ah, 5500Ah, 6000Ah, 6500Ah, 6670Ah, etc., or a range value between any two.
The positive electrode material of the battery cell 21 comprises lithium transition metal oxide, and the parallel number X of the batteries 2 in the battery compartment 11 1 Number X of parallel connection of battery cells 21 of 1 and battery 2 2 In the case of 2, the capacity of the battery cell 21 is set within the range of 750Ah to 6670Ah, so that the power matching requirement of the energy storage device 10 can be met, and the voltage requirement of the energy storage device 10 can be met.
In some embodiments, 1800 Ah.ltoreq.C.ltoreq.4000 Ah.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, X 1 =1, and X 2 =2. C may be any one of point values or a range between any two of point values of 1800Ah, 1900Ah, 2000Ah, 2100Ah, 2200Ah, 2300Ah, 2400Ah, 2500Ah, 2600Ah, 2700Ah, 2800Ah, 2900Ah, 3000Ah, 3100Ah, 3200Ah, 3300Ah, 3400Ah, 3500Ah, 3600Ah, 3700Ah, 3800Ah, 3900Ah, 4000Ah, and the like.
In some embodiments, 2.ltoreq.X 1 ≤6。
In the present embodiment, X 1 May be 2, 3, 4, 5, 6.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, and the parallel number X of the batteries 2 in the battery compartment 11 1 The capacity of the battery unit 21 is not too large, the manufacturing difficulty and the manufacturing cost of the battery unit 21 are reduced, and the parallel number X of the batteries 2 in the battery compartment 11 is also reduced 1 Is not excessive, and is beneficial to improving the space utilization rate of the battery compartment 11.
In some embodiments, X 1 ＝4，X 2 ＝1，375Ah≤C≤3300Ah。
In the present embodiment, the cathode material of the battery cell 21 includes lithium transition metal oxide, and C may be a point value of any one of 375Ah, 500Ah, 800Ah, 1000Ah, 1300Ah, 1500Ah, 1800Ah, 2000Ah, 2300Ah, 2500Ah, 2600Ah, 2800Ah, 3000Ah, 3150Ah, 3300Ah, or the like or a range value between any two thereof.
In the present embodiment, the positive electrode material in the battery cell 21 includes lithium transition metal oxide, and X 1 ＝4，X 2 In the case of =1, the capacity of the battery cell 21 is set within the range of 375Ah to 3300Ah, so that the power matching requirement of the energy storage device 10 can be satisfied, and the voltage requirement of the energy storage device 10 can be satisfied.
In some embodiments, 700 Ah.ltoreq.C.ltoreq.1600 Ah.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, X 1 ＝4，X 2 The value of c=1 may be any one of the point values of 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, 1600Ah, or the like or a range value between any two.
In some embodiments, X 1 ＝4，X 2 ＝2，200Ah≤C≤1600Ah。
In the present embodiment, C may be a point value of any one of 200Ah, 300Ah, 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, 1600Ah, or the like, or a range value between any two thereof.
In the present embodiment, the positive electrode material in the battery cell 21 includes lithium transition metal oxide, and X 1 ＝4，X 2 In the case of =2, the capacity of the battery cell 21 is set in the range of 200Ah to 1600Ah, so that the power matching requirement of the energy storage device 10 can be satisfied, and the voltage requirement of the energy storage device 10 can be satisfied.
In some embodiments, 340Ah C1050 Ah.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithium transition metal oxide, X 1 ＝4，X 2 The value of c=2 may be any one of the point values or a range between any two of 340Ah, 400Ah, 450Ah, 500Ah, 550Ah, 600Ah, 650Ah, 700Ah, 750Ah, 800Ah, 850Ah, 900Ah, 950Ah, 1000Ah, 1050Ah, etc.
In some embodiments, 490Ah C.ltoreq.720 Ah.
In the present embodiment, the positive electrode material of the battery cell 21 includes lithiumTransition metal oxide, X 1 ＝4，X 2 The value of c=2 may be a point value of any one of 490Ah, 500Ah, 530Ah, 550Ah, 572Ah, 580Ah, 600Ah, 630Ah, 650Ah, 680Ah, 700Ah, 720Ah, or the like or a range value between any two.
In some embodiments, the battery cell 21 is a sodium ion battery cell, 1.5 V.ltoreq.U 0 ≤4V，230≤Y 1 *Y 2 ≤1000。
In the present embodiment, U 0 The value may be any one of the point values or a range between any two 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. Y is Y 1 *Y 2 May be any point value or 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.
When the battery cell 21 is a sodium ion battery cell, U is not less than 1.5V 0 ≤4V，230≤Y 1 *Y 2 The voltage of the energy storage converter 20 can be controlled within a reasonable range less than or equal to 1000, so that the voltage of the energy storage device 10 is not too low, the energy storage device 10 can be matched with the energy storage converter 20 with higher working voltage, the voltage of the energy storage device 10 is not too high, the requirement on the working voltage of the energy storage converter 20 is reduced, and the production cost is reduced.
In some embodiments, 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 ≤18。
In this embodiment, P may be 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 W, etcA point value or a range value between any two. X is X 1 *X 2 May be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
The battery cell 21 is a sodium ion battery cell, 3.5×10 6 W≤P≤7.5*10 6 W, and m=a, X may be 1 *X 2 Is set in the range of 1 to 18 to control the capacity of the battery cell 21 within a reasonable range.
In some embodiments, X 1 ＝1。
In the present embodiment, the battery cells 21 are sodium ion battery cells, X 2 May be 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
In some embodiments, X 2 ＝1，1200Ah≤C≤18000Ah。
In the present embodiment, X 1 ＝1，X 2 The value of c may be any one of the dot values or a range between any two of 1200Ah, 1500Ah, 1800Ah, 2000Ah, 3000Ah, 4000Ah, 5000Ah, 6000Ah, 7000Ah, 8000Ah, 9000Ah, 10000Ah, 11000Ah, 12000Ah, 13000Ah, 14000Ah, 15000Ah, 16000Ah, 17000Ah, 18000Ah, etc.
The battery cell 21 is a sodium ion battery cell, and the parallel number X of the batteries 2 in the battery compartment 11 1 Parallel X with cell 21 of battery 2 2 Under the condition of 1, the capacity of the battery monomer 21 is set in the range of 1200Ah to 18000Ah, so that the power matching requirement of the energy storage device 10 can be met, and the voltage requirement of the energy storage device 10 can be met.
In some embodiments, 2000 Ah.ltoreq.C.ltoreq.10000 Ah.
In the present embodiment, the battery cells 21 are sodium ion battery cells, X 1 =1, and X 2 =1. C may be a point value of any one of 2000Ah, 2300Ah, 2500Ah, 2800Ah, 3000Ah, 3300Ah, 3500Ah, 3800Ah, 4000Ah, 4300Ah, 4500Ah, 4800Ah, 5000Ah, 5300Ah, 5500Ah, 5800Ah, 6000Ah, 6300Ah, 6500Ah, 6800Ah, 7000Ah, 8000Ah, 9000Ah, 10000Ah, etc., or a range between any two thereofAnd (5) surrounding value.
In some embodiments, X 2 ＝2，600Ah≤C≤9000Ah。
In the present embodiment, the battery cells 21 are sodium ion battery cells, X 1 =1, and X 2 =2. The C may be any one of the dot values or a range between any two of the dot values of 600Ah, 650Ah, 700Ah, 750Ah, 850Ah, 1000Ah, 1500Ah, 2000Ah, 2500Ah, 3000Ah, 3500Ah, 4000Ah, 4500Ah, 5000Ah, 5500Ah, 6000Ah, 6500Ah, 7000Ah, 7500Ah, 8000Ah, 8500Ah, 9000Ah, etc.
The battery cell 21 is a sodium ion battery cell, and the parallel number X of the batteries 2 in the battery compartment 11 1 Number X of parallel connection of battery cells 21 of 1 and battery 2 2 In the case of 2, the capacity of the battery cell 21 is set in the range of 600Ah to 9000Ah, so that the power matching requirement of the energy storage device 10 can be met, and the voltage requirement of the energy storage device 10 can be met.
In some embodiments 1600 Ah.ltoreq.C.ltoreq.4000 Ah.
In the present embodiment, the battery cells 21 are sodium ion battery cells, X 1 =1, and X 2 =2. The C may be any one of point values or a range between any two of point values of 1600Ah, 1700Ah, 1800Ah, 1900Ah, 2000Ah, 2100Ah, 2200Ah, 2300Ah, 2400Ah, 2500Ah, 2600Ah, 2700Ah, 2800Ah, 2900Ah, 3000Ah, 3100Ah, 3200Ah, 3300Ah, 3400Ah, 3500Ah, 3600Ah, 3700Ah, 3800Ah, 3900Ah, 4000Ah, and the like.
In some embodiments, 2.ltoreq.X 1 ≤6。
In the present embodiment, X 1 May be 2, 3, 4, 5, 6.
In the present embodiment, the parallel number X of the batteries 2 in the battery compartment 11 is set 1 The capacity of the battery unit 21 is not too large, the manufacturing difficulty and the manufacturing cost of the battery unit 21 are reduced, and the parallel number X of the batteries 2 in the battery compartment 11 is also reduced 1 Is not excessive, and is beneficial to improving the space utilization rate of the battery compartment 11.
In some embodiments, X 1 ＝4，X 2 ＝1，300Ah≤C≤4000Ah。
In the present embodiment, the battery cell 21 is a sodium ion battery cell, and C may be a point value or a range value between any two of 300Ah, 375Ah, 400Ah, 500Ah, 800Ah, 1000Ah, 1300Ah, 1500Ah, 1800Ah, 2000Ah, 2300Ah, 2500Ah, 2600Ah, 2800Ah, 3000Ah, 3150Ah, 3300Ah, 3500Ah, 3700Ah, 3900Ah, 4000Ah, or the like.
The battery cell 21 is a sodium ion battery cell, and X 1 ＝4，X 2 In the case of =1, the capacity of the battery cell 21 is set in the range of 300Ah to 4000Ah, so that the power matching requirement of the energy storage device 10 can be satisfied, and the voltage requirement of the energy storage device 10 can be satisfied.
In some embodiments, 700 Ah.ltoreq.C.ltoreq.1500 Ah.
In the present embodiment, the battery cells 21 are sodium ion battery cells, X 1 ＝4，X 2 The value of c=1 may be any one of the point values of 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, or the like or a range value between any two.
In some embodiments, X 1 ＝4，X 2 ＝2，150Ah≤C≤1500Ah。
In the present embodiment, C may be a point value of any one of 150Ah, 200Ah, 300Ah, 400Ah, 500Ah, 600Ah, 700Ah, 800Ah, 900Ah, 1000Ah, 1100Ah, 1200Ah, 1300Ah, 1400Ah, 1500Ah, or the like, or a range value between any two thereof.
The battery cell 21 is a sodium ion battery cell, and X 1 ＝4，X 2 In the case of =2, the capacity of the battery cell 21 is set in the range of 150Ah to 1500Ah, so that the power matching requirement of the energy storage device 10 can be satisfied, and the voltage requirement of the energy storage device 10 can be satisfied.
In some embodiments, 350 Ah.ltoreq.C.ltoreq.1200 Ah.
In the present embodiment, the battery cells 21 are sodium ion battery cells, X 1 ＝4，X 2 =2, c may be 350Ah, 400Ah, 450Ah, 500Ah, 550Ah, 600Ah, 650Ah, 700Ah, 750Ah, 800Ah, 850Ah, 900Ah, 950Ah,Any one point value or range value between any two of 1000Ah, 1050Ah, 1100Ah, 1200Ah and the like.
In some embodiments, 400Ah C is less than or equal to 650Ah.
In the present embodiment, the battery cells 21 are sodium ion battery cells, X 1 ＝4，X 2 The value of c=2 may be any one of point values or a range between any two of point values 400Ah, 420Ah, 450Ah, 470Ah, 490Ah, 500Ah, 506Ah, 530Ah, 550Ah, 580Ah, 600Ah, 630Ah, 650Ah, and the like.
In some embodiments, X is in combination with FIGS. 3 and 8 1 The first battery packs 2a are arranged along the length direction X of the case.
In the present embodiment, the battery compartment 11 accommodates N 1 The cells 2, N 1 The individual cells 2 are denoted by X 1 A plurality of parallel-connected first battery packs 2a, each first battery pack 2a being formed of Y 1 The individual cells 2 are formed in series. As an example, 2.ltoreq.X 1 ≤6。
It should be noted that, whether the battery cell 21 is a sodium ion battery 2, the positive electrode material of the battery cell 21 includes a lithium-containing phosphate, or the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, it may be X 1 The first battery packs 2a are arranged along the length direction X of the case.
In the present embodiment, X 1 The first battery packs 2a are arranged along the length direction X of the box body, if the X is arranged between 2 and 6, the space of the battery compartment 11 along the length direction X of the box body can be fully utilized, the layout is reasonable, and the space utilization rate of the battery compartment 11 is improved.
In some embodiments, referring to fig. 12-14, fig. 12 is a schematic structural diagram of an energy storage device 10 according to other embodiments of the present disclosure; fig. 13 is a schematic structural view of the case 1 shown in fig. 12; fig. 14 is a B-B cross-sectional view of the energy storage device 10 shown in fig. 12. The battery compartment 11 includes a plurality of sub-compartments 111, the plurality of sub-compartments 111 being arranged along a length direction X of the case, and each sub-compartment 111 accommodating one first battery pack 2a along the length direction X of the case.
The first battery pack 2a in each sub-compartment 111 may also be referred to as a battery cluster,the number of battery clusters may be equal to the number of sub-bins 111. During installation, Y can be used 1 The individual cells 2 are accommodated in the sub-compartments 111 and connected in series to form one first battery pack 2a, respectively.
The sub-bins 111 may be two, three, four, five, six or more. The adjacent two sub-bins 111 may be partitioned by a partition 112, and the partition 112 may be a partition plate provided between the two sub-bins 111, or may be a partition beam provided between the two sub-bins 111, and the partition beam may extend along the height direction Z of the box body. When the partition 112 is a partition beam provided between two adjacent sub-tanks 111, the partition beam between two adjacent sub-tanks 111 may be provided in plurality, and the plurality of partition beams may be arranged at intervals along the width direction Y of the box.
The sub-cartridges 111 may be of various shapes, such as, for example, cylindrical, prismatic. The prism may be a triangular prism, a quadrangular prism, a pentagonal prism, a hexagonal prism, etc. Along the length direction X of the case, the sub-compartment 111 may accommodate one battery 2, or may accommodate a plurality of batteries 2; along the height direction Z of the box body, the sub-bin 111 can accommodate one battery 2, and can also accommodate a plurality of batteries 2; the sub-compartment 111 may accommodate one battery 2 or a plurality of batteries 2 along the width of the case 1 in reverse.
In this embodiment, the battery compartment 11 is divided into a plurality of sub-compartments 111, and each sub-compartment 111 can accommodate the first battery pack 2a therein, so that the first battery pack 2a can be more regularly accommodated in the battery compartment 11, and the installation of the batteries 2 in the first battery pack 2a is easier to realize.
In some embodiments, referring to fig. 12-14, the battery compartment 11 accommodates only one first battery pack 2a along the height direction Z of the case, and Y in each first battery pack 2a 1 The batteries 2 are distributed along the height direction Z of the box body, and Y is more than or equal to 2 1 ≤10。
Y 1 May be 2, 3, 4, 5, 6, 7, 8, 9, 10.
It is understood that all the cells 2 in the first battery pack 2a are arranged in the height direction Z of the case. In the embodiment in which the sub-compartment 111 accommodates only one first battery pack 2a, it is understood that the sub-compartment 111 accommodates a plurality of batteries 2 in the height direction Z of the case, and the plurality of batteries 2 are connected in series. As an example, along the width direction Y of the case, the sub-compartment 111 accommodates only one battery 2; along the length direction X of the case, the sub-compartment 111 accommodates only one battery 2.
As an example, the supporting pieces 113 are provided at both sides of each sub-bin 111 along the length direction X of the case. The support 113 is located at the bottom of the battery 2 in the height direction Z of the case. The support 113 is for supporting the battery 2. The support 113 may be mounted on the compartment wall of the battery compartment 11 and the partition 112. The arrangement of the supporting pieces 113 can improve the stability of each battery 2 in the sub-bin 111 on one hand; on the other hand, the two adjacent batteries 2 in the height direction Z of the box body in the sub-compartment 111 are kept at a certain distance, and the adjacent batteries 2 are not easily affected when one battery 2 is detached.
In the embodiment of the case 1 having the electric bin 14 and the main control bin 13, the main control unit in the main control bin 13 may implement high voltage control and communication of the first battery packs 2a (battery clusters), and the converging unit in the electric bin 14 may implement parallel converging of the plurality of first battery packs 2a, so as to implement safe connection between the plurality of first battery packs 2a and the dc side of the energy storage converter 20.
In the present embodiment, all the cells 2 in the first battery pack 2a are arranged along the height direction Z of the case, which is advantageous in achieving the series connection of all the cells 2 in the first battery pack 2 a. Y is set to 1 Is arranged between 2 and 10, so that Y 1 Is not too large. The number of the batteries 2 arranged along the height direction Z of the box body in the battery compartment 11 is not too large, which is beneficial to improving the space utilization rate of the battery compartment 11.
In some embodiments, referring to fig. 15-18, fig. 15 is an isometric 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 a cross-sectional exploded view of the battery cell 21 shown in fig. 15, taken along the UW plane; fig. 18 is a cross-sectional exploded view of the battery cell 21 shown in fig. 15 taken along the VW plane. The embodiment also provides a battery cell 21, where the battery cell 21 includes a housing 211 and at least one electrode assembly 213, and the electrode assembly 213 is accommodated in the housing 211. The housing 211 has a straight parallelepiped shapeThe housing 211 has a dimension W in the first direction U 1 The housing 211 has a dimension T in the second direction V 1 The housing 211 has a dimension K in the third direction W 1 One of the first direction U, the second direction V and the third direction W is parallel to the length direction X of the box body, the other is parallel to the width direction Y of the box body, and the other is parallel to the height direction Z of the box body; the housing 211 includes a first wall 2113 and a second wall 2114 disposed opposite to each other in a first direction U, a third wall 2115 and a fourth wall 2116 disposed opposite to each other in a second direction V, a fifth wall 2117 and a sixth wall 2118 disposed opposite to each other in a third direction W, a sum of thicknesses of the first wall 2113 and the second wall 2114 being a, a sum of thicknesses of the third wall 2115 and the fourth wall 2116 being b, and a sum of thicknesses of the fifth wall 2117 and the sixth wall 2118 being c, satisfying: (W) 1 -a)*(T 1 -b)*(K 1 -c)/(W 1 *T 1 *K 1 )≥90％。
The number of the electrode assemblies 213 in the housing 211 may be one or more. If there are a plurality of electrode assemblies 213 in the case 211, the plurality of electrode assemblies 213 may be connected in parallel.
The housing 211 has a shape of a straight parallelepiped, which may be a rectangular parallelepiped, a square, or the like. Of the six walls of the housing 211, four walls may form the housing 211, 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 dimensions of the housing 211 in the first direction U, the dimensions of the housing 211 in the second direction V, the dimensions 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 may all be measured by vernier calipers.
As an example, the first wall 2113, the second wall 2114, the third wall 2115, the fourth wall 2116, the fifth wall 2117, and the sixth wall 2118 are all aluminum alloys. The aluminum alloy comprises the following components in percentage by mass: 96.7% or more of aluminum, 0.05% or less of copper or less of 0.2% or less of iron or less of 0.7% or less of manganese or less of 1.5% or less of silicon or less of 0.6% or less of zinc or less of 0.1% or less of other single element components or less of 0.05% or less of other element total components or less of 0.15% or less.
By way of example, the firstThe 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. It will be appreciated that W 1 For the length, T, of the housing 211 of the battery cell 21 1 For the width, K, of the housing 211 of the battery cell 21 1 Is the height of the housing 211 of the battery cell 21.
(W 1 -a)*(T 1 -b)*(K 1 -c)/(W 1 *T 1 *K 1 ) The value may be any one of the point values or a range between any two of the point values 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.
Wherein, (W) 1 -a)*(T 1 -b)*(K 1 C) is understood to be the volume of the interior space of the housing 211, i.e. the volume of the space enclosed by the interior surface of the housing 211. W (W) 1 *T 1 *K 1 Is the volume of the housing 211.
If the outer surfaces of the six walls of the housing 211 are all planar, W is measured with respect to the outer surfaces of the respective walls 1 、T 1 And K 1 . For example, if the outer surface of the fifth wall 2117 and the outer surface of the sixth wall 2118 are both planar, K 1 To be in the third direction W, a distance between an outer surface of the fifth wall 2117 and an outer surface of the sixth wall 2118.
If a convex portion or a concave portion is formed on the outer surface of one wall of the housing 211, W is measured with reference to the planar area of the outer surface (i.e., the area other than the convex portion or the concave portion) 1 、T 1 And K 1 . For example, if the outer surface of the fifth wall 2117 is planar and the outer surface of the sixth wall 2118 is formed with first protrusions (e.g., the sixth wall 2118 is the end cap 2112 and the protrusions formed on the end cap 2112 are first protrusions), then K 1 Is the distance in the third direction W between the planar area of the outer surface of the sixth wall 2118 other than the first protrusion and the outer surface of the fifth wall 2117. If the outer surface of the sixth wall 2118 is formed with a first protrusion and the outer surface of the fifth wall 2117 is formed with a second protrusion, then K 1 Is the distance in the third direction W between the planar area of the outer surface of the fifth wall 2117 other than the second protrusion and the planar area of the outer surface of the sixth wall 2118 other than the first protrusion.
If the six walls of the housing 211 are each a wall having a uniform thickness, the distance between the outer surface and the inner surface of each wall may be measured from any position of the wall, thereby obtaining the thickness of the wall. If one wall of the housing 211 is a wall having an uneven thickness, the thickness of the wall is obtained by measuring the distance between the outer surface and the inner surface of the wall from the position where the thickness of the wall is the largest. That is, if the thickness of one wall is not uniform, a or b or c is calculated by taking the maximum thickness of the wall.
In such a battery cell 21, the ratio of the volume of the inner space of the case 211 of the battery cell 21 to the volume of the case 211 is 90% or more, so that the inner space of the case 211 occupies a relatively large space, the space in which the case 211 can accommodate the electrode assembly 213 increases, and the volumetric energy density of the battery cell 21 can be improved under the same chemical system.
The following is a detailed description of specific experimental data:
in the experiment, the battery cell 21 is a square battery cell 21, the housing 2111 of the housing 211 has a hollow structure with one end open, and the end cover 2112 in the battery cell 21 is one.
TABLE 2
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From the above Table 2, comparative examples 10 to 13 and comparative example 2 show that in the case where the positive electrode material of the battery cell 21 includes a lithium-containing phosphate, (W) 1 -a)*(T 1 -b)*(K 1 -c)/(W 1 *T 1 *K 1 ) And the volume energy density of the battery monomer 21 can be effectively improved by more than or equal to 90 percent. Comparative examples 14 to 17 and comparative examplesExample 3 shows that, (W) in the case where the positive electrode material of the battery cell 21 includes a lithium transition metal oxide 1 -a)*(T 1 -b)*(K 1 -c)/(W 1 *T 1 *K 1 ) And the volume energy density of the battery monomer 21 can be effectively improved by more than or equal to 90 percent. Comparative examples 18 to 21 and comparative example 4 show that, (W) in the case where the battery cell 21 is a sodium ion battery cell 1 -a)*(T 1 -b)*(K 1 -c)/(W 1 *T 1 *K 1 ) And the volume energy density of the battery monomer 21 can be effectively improved by more than or equal to 90 percent.
In some embodiments, (W) 1 -a)/W 1 ≥97.0％，(T 1 -b)/T 1 More than or equal to 96.5 percent, and (K) 1 -c)/K 1 ≥96.5％。
By combining W 1 -a and W 1 The ratio of (2) is set to 97.0% or more such that the length of the inner space of the case 211 becomes large in the case where the length of the battery cell 21 is not changed, thereby allowing the longer electrode assembly 213 to be accommodated; the volumetric energy density of the battery cell 21 can be increased under the same chemical material system. (W) 1 -a)/W 1 The values may be any one of 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, etc., or a range between any two.
By combining T 1 -b and T 1 The ratio of (2) is set to 96.5% or more so that the width of the inner space of the case 211 becomes large in the case where the width of the battery cell 21 is not changed, thereby allowing the wider electrode assembly 213 to be accommodated; the volumetric energy density of the battery cell 21 can be increased under the same chemical material system. (T) 1 -b)/T 1 The values may be any one of the point values or the range values between any two of 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, etc.
By combining K 1 -c and K 1 The ratio of (2) is set to 96.5% or more so that the height of the inner space of the case 211 becomes large in the case where the height of the battery cell 21 is not changed, thereby allowing the higher electrode assembly 213 to be accommodated; the volumetric energy density of the battery cell 21 can be increased under the same chemical material system. (K) 1 -c)/K 1 The values may be any one of the point values or the range values between any two of 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5%, etc.
In some embodiments, with continued reference to fig. 15-18, the housing 211 includes a housing 2111 and an end cap 2112, the housing 2111 having an opening, the end cap 2112 covering the opening; housing 2111 includes integrally formed first, second, third, fourth and fifth walls 2113, 2114, 2115, 2116, 2117, and end cap 2112 is a sixth wall 2118.
In this embodiment, the housing 2111 has a hollow structure with an opening formed at one end, and the end cap 2112 in the housing 211 is one. End cap 2112 is provided separately from housing 2111 and attached, end cap 2112 and housing 2111 may be welded or crimped, etc.
When the battery 2 is assembled, the electrode terminal 212 may be mounted on the end cap 2112, the electrode assembly 213 may be accommodated in the case 2111, and the end cap 2112 may be covered on the opening of the case 2111, so that the difficulty in mounting the electrode assembly 213 in the case 211 and the difficulty in mounting the electrode terminal 212 in the case 211 may be reduced.
In some embodiments, referring to FIGS. 17 and 18, the first wall 2113 and the second wall 2114 are each a thick 1 ，2*a 1 =a; the third wall 2115 and the fourth wall 2116 each have a thickness b 1 ，2*b 1 =b; the fifth wall 2117 has a thickness c 1 The sixth wall 2118 has a thickness c 2 ，c 2 ＞c 1 ，c 1 ＞a 1 ，c 1 ＞b 1 。0.5mm≤a 1 ≤1.5mm，0.5≤b 1 ≤1.5mm，1.0mm≤c 1 ≤2.5mm，1.5mm≤c 2 ≤4mm。
To reduce the likelihood of the electrode assembly 213 interfering with the housing 2111 during installation of the housing 2111, the risk of damage to the electrode assembly 213 is reduced, leaving a certain assembly clearance (i.e., in-housing clearance) for the electrode assembly 213 when designing the housing 2111, which may be 0.8-2mm.
In addition, in order to reduce the possibility of an internal short circuit of the battery cell 21, an insulating member may be provided inside the case 211, but the insulating member inevitably occupies a part of the internal space of the case 211, resulting in a reduction in the space reserved for the electrode assembly 213 and the electrolyte.
In some embodiments, the battery cell 21 may further include a first insulating member 214 and a second insulating member 215, the first insulating member 214 being disposed between the fifth wall 2117 and the electrode assembly 213 and abutting the fifth wall 2117; the second insulator 215 is disposed between the sixth wall 2118 and the electrode assembly 213, and abuts against the sixth wall 2118; the first insulating member 214 has a maximum dimension e in the third direction W 1 The maximum dimension of the second insulating member 215 in the third direction W is e 2 The method comprises the following steps: (W) 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 )≥88％，0.3mm≤e 1 Less than or equal to 1.2mm, and less than or equal to 2mm and less than or equal to e 2 ≤10mm。
(W 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 ) The values may be any one of the point values or a range between any two of the point values 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.
e 1 The value may be any one of a point value or a range value between any two of 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.
e 2 The point value may be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.
In the present embodiment, W 1 -a-1.6mm means: when the fitting clearance between the electrode assembly 213 and the case 2111 is taken to be 0.8mm, the inner space of the housing 211 is left to the maximum size of the electrode assembly 213 in the first direction U. T (T) 1 The meaning of b-1.6mm is: when the fitting clearance between the electrode assembly 213 and the case 2111 is taken to be 0.8mm, the inner space of the housing 211 is left to the maximum size of the electrode assembly 213 in the second direction V. K (K) 1 -c-e 1 -e 2 The meaning of the expression is: at fifth wall 2117 and electrode assembly 213, and a second insulator 215 abutting the sixth wall 2118 is provided between the sixth wall 2118 and the electrode assembly 213, the inner space of the case 211 is left to the maximum size of the electrode assembly 213 in the third direction W. The first insulator 214 may be a bottom plate and the second insulator 215 may be a lower plastic.
In the present embodiment, (W) 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 ) 88% or more, so that the space left for the electrode assembly 213 inside the case 211 is increased, allowing the electrode assembly 213 having a larger volume to be received, so that the volumetric energy density of the battery cell 21 is further improved.
In some embodiments, the battery cell 21 may further include a first insulating member 214 and a second insulating member 215, the first insulating member 214 being disposed between the fifth wall 2117 and the electrode assembly 213 and abutting the fifth wall 2117; the second insulator 215 is disposed between the sixth wall 2118 and the electrode assembly 213, and abuts against the sixth wall 2118; the first insulating member 214 has a maximum dimension e in the third direction W 1 The maximum dimension of the second insulating member 215 in the third direction W is e 2 The method comprises the following steps: (W) 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 )≥85％，0.3mm≤e 1 Less than or equal to 1.2mm, and less than or equal to 2mm and less than or equal to e 2 ≤10mm。
(W 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 ) May be any one of a point value or a range value between any two of 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.
e 1 The value may be any one of a point value or a range value between any two of 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, etc.
e 2 Can be 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc Any one of the point values or a range value between any two.
In the present embodiment, W 1 -a-4mm means: when the assembly gap between the electrode assembly 213 and the case 2111 is taken to be 2mm, the inner space of the case 211 is left to the maximum size of the electrode assembly 213 in the first direction U. T (T) 1 The meaning of b-4mm is: when the assembly gap between the electrode assembly 213 and the case 2111 is taken to be 2mm, the inner space of the case 211 is left to the maximum size of the electrode assembly 213 in the second direction V. K (K) 1 -c-e 1 -e 2 The meaning of the expression is: when the first insulator 214 abutting the fifth wall 2117 is provided between the fifth wall 2117 and the electrode assembly 213 and the second insulator 215 abutting the sixth wall 2118 is provided between the sixth wall 2118 and the electrode assembly 213, the inner space of the case 211 is left to the maximum size of the electrode assembly 213 in the third direction W.
In the present embodiment, (W) 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 ) 85% or more so that the space left for the electrode assembly 213 inside the case 211 is increased, allowing the electrode assembly 213 having a larger volume to be received, so that the volumetric energy density of the battery cell 21 is further improved.
In some embodiments, W 1 ≥T 1 The first direction U is parallel to the length direction X of the box, the second direction V is parallel to the width direction Y of the box, and the third direction W is parallel to the height direction Z of the box.
As an example, the first direction U is a length direction of the case 211 of the battery cell 21, the second direction V is a width direction of the case 211 of the battery cell 21, and the third direction W is a height direction of the case 211 of the battery cell 21 such that the length direction of the case 211 is parallel to the length direction X of the case, the width direction of the case 211 is parallel to the width direction Y of the case, and the height direction of the case 211 is parallel to the height direction Z of the case.
An end cap 2112 is provided at only one end of the housing 2111 and W 1 ≥T 1 In the case of (2), the end cap 2112 and the fifth wall 2117 of the housing 211 are disposed opposite to each other in the height direction Z of the box, and the outside is taken outThe first wall 2113 and the second wall 2114 of the case 211 are disposed opposite to each other along the longitudinal direction X of the case, and the third wall 2115 and the fourth wall 2116 of the case 211 are disposed opposite to each other along the width direction Y of the case, which is advantageous in increasing the volume ratio of all the battery cells 21 in the battery compartment 11.
In some embodiments, referring to fig. 19-22, fig. 19 is an isometric view of a battery cell 21 according to other embodiments of the present application; fig. 20 is an exploded view of the battery cell 21 shown in fig. 19; fig. 21 is a cross-sectional exploded view of the battery cell 21 shown in fig. 19 taken along the UW plane; fig. 22 is a cross-sectional exploded view of the battery cell 21 shown in fig. 19 taken along the VW plane. The housing 211 includes a case 2111 and two end caps 2112, the case 2111 having two openings oppositely disposed in the third direction W, the two end caps 2112 respectively covering the two openings; the housing 2111 includes integrally formed first, second, third and fourth walls 2113, 2114, 2115, 2116, and two end caps 2112, a fifth and sixth wall 2117, 2118, respectively.
In this embodiment, the housing 2111 has a hollow structure with openings formed at both ends, and two end caps 2112 are provided in the housing 211, and the two end caps 2112 close the openings at both ends of the housing 2111, respectively.
In some embodiments, with continued reference to fig. 21 and 22, the thickness of the first wall 2113 and the thickness of the second wall 2114 are both a 1 ，2*a 1 =a; the thickness of the third wall 2115 and the thickness of the fourth wall 2116 are both b 1 ，2*b 1 =b; the thickness of the fifth wall 2117 and the thickness of the sixth wall 2118 are c 1 ，2*c 1 ＝c，c 1 ＞a 1 ，c 1 ＞b 1 。0.5mm≤a 1 ≤1.5mm，0.5≤b 1 ≤1.5mm，1.0mm≤c 1 ≤4mm。
To reduce the likelihood of the electrode assembly 213 interfering with the housing 2111 during installation of the housing 2111, the risk of damage to the electrode assembly 213 is reduced, leaving a certain assembly clearance (i.e., in-housing clearance) for the electrode assembly 213 when designing the housing 2111, which may be 0.8-2mm.
In addition, in order to reduce the possibility of an internal short circuit of the battery cell 21, an insulating member may be provided inside the case 211, but the insulating member inevitably occupies a part of the internal space of the case 211, resulting in a reduction in the space reserved for the electrode assembly 213 and the electrolyte.
In some embodiments, the battery cell 21 may further include a third insulator 216 and a fourth insulator 217, the third insulator 216 being disposed between the fifth wall 2117 and the electrode assembly 213 and abutting the fifth wall 2117; the fourth insulator 217 is provided between the sixth wall 2118 and the electrode assembly 213, and abuts against the sixth wall 2118; the maximum dimension of the third insulator 216 in the third direction W is e 3 The maximum dimension of the fourth insulator 217 in the third direction W is e 4 The method comprises the following steps: (W) 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 )≥88％，2mm≤e 3 Less than or equal to 10mm and less than or equal to 2mm and less than or equal to e 4 ≤10mm。
(W 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 ) The values may be any one of the point values or a range between any two of the point values 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.
e 3 The point value may be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.
e 4 The point value may be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.
In the present embodiment, W 1 -a-1.6mm means: when the fitting clearance between the electrode assembly 213 and the case 2111 is taken to be 0.8mm, the inner space of the housing 211 is left to the maximum size of the electrode assembly 213 in the first direction U. T (T) 1 The meaning of b-1.6mm is: when the fitting clearance between the electrode assembly 213 and the case 2111 is taken to be 0.8mm, the inner space of the housing 211 is left to the maximum size of the electrode assembly 213 in the second direction V. K (K) 1 -c-e 3 -e 4 The meaning of the expression is: an interface is provided between the fifth wall 2117 and the electrode assembly 213When the third insulator 216 is abutted against the fifth wall 2117 and the fourth insulator 217 is provided between the sixth wall 2118 and the electrode assembly 213, which is abutted against the sixth wall 2118, the inner space of the case 211 is left to the maximum size of the electrode assembly 213 in the third direction W. The third insulator 216 and the fourth insulator 217 may each be a lower plastic.
In the present embodiment, W 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 ) 88%, so that the space left for the electrode assembly 213 inside the case 211 is increased, allowing the electrode assembly 213 having a larger volume to be received, so that the volumetric energy density of the battery cell 21 is further improved.
In some embodiments, the battery cell 21 may further include a third insulator 216 and a fourth insulator 217, the third insulator 216 being disposed between the fifth wall 2117 and the electrode assembly 213 and abutting the fifth wall 2117; the fourth insulator 217 is provided between the sixth wall 2118 and the electrode assembly 213, and abuts against the sixth wall 2118; the maximum dimension of the third insulator 216 in the third direction W is e 3 The maximum dimension of the fourth insulator 217 in the third direction W is e 4 The method comprises the following steps: (W) 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 )≥85％，2mm≤e 3 Less than or equal to 10mm and less than or equal to 2mm and less than or equal to e 4 ≤10mm。
(W 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 ) May be any one of a point value or a range value between any two of 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc.
e 3 The point value may be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.
e 4 The point value may be any one of 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or a range value between any two.
In the present embodiment, W 1 -a-4mm means: when the assembly gap between the electrode assembly 213 and the case 2111 is taken to be 2mm, the inner space of the case 211 is left to the maximum size of the electrode assembly 213 in the first direction U. T (T) 1 The meaning of b-4mm is: when the assembly gap between the electrode assembly 213 and the case 2111 is taken to be 2mm, the inner space of the case 211 is left to the maximum size of the electrode assembly 213 in the second direction V. K (K) 1 -c-e 3 -e 4 The meaning of the expression is: when the third insulator 216 abutting the fifth wall 2117 is provided between the fifth wall 2117 and the electrode assembly 213 and the fourth insulator 217 abutting the sixth wall 2118 is provided between the sixth wall 2118 and the electrode assembly 213, the inner space of the case 211 is left to the maximum size of the electrode assembly 213 in the third direction W.
In the present embodiment, (W) 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 ) 85% or more so that the space left for the electrode assembly 213 inside the case 211 is increased, allowing the electrode assembly 213 having a larger volume to be received, so that the volumetric energy density of the battery cell 21 is further improved.
In some embodiments, W 1 ≥T 1 The first direction U is parallel to the height direction Z of the box, the second direction V is parallel to the width direction Y of the box, and the third direction W is parallel to the length direction X of the box.
As an example, the first direction U is a length direction of the case 211 of the battery cell 21, the second direction V is a width direction of the case 211 of the battery cell 21, and the third direction W is a height direction of the case 211 of the battery cell 21 such that the length direction of the case 211 is parallel to the height direction Z of the case, the width direction of the case 211 is parallel to the width direction Y of the case, and the height direction of the case 211 is parallel to the length direction X of the case.
End caps 2112 and W are provided at both ends of housing 2111 1 ≥T 1 In the case of (a), the two end caps 2112 of the housing 211 are arranged in the longitudinal direction X of the box, the first wall 2113 and the second wall 2114 of the housing 211 are arranged in the height direction Z of the box, and the outer wallThe third wall 2115 and the fourth wall 2116 of the case 211 are disposed opposite to each other in the width direction Y of the case, which is advantageous in increasing the volume ratio of all the battery cells 21 in the battery compartment 11.
In some embodiments, 3000cm 3 ≤W 1 *T 1 *K 1 ≤40000cm 3 。
W 1 *T 1 *K 1 May be 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 And the like, or a range value between any two.
In the present embodiment, W 1 *T 1 *K 1 ≥3000cm 3 So that the wall thickness of the housing 211 is not too small in the case that the ratio of the volume of the inner space of the housing 211 to the volume of the housing 211 is above 90% is satisfied, thereby being capable of satisfying the structural strength requirement of the housing 211; w (W) 1 *T 1 *K 1 ≤40000cm 3 The capacity and current of the battery cells 21 can be controlled within appropriate ranges, reducing the risk of damage to the overcurrent elements in the circuit.
In some embodiments, 3200cm 3 ≤W 1 *T 1 *K 1 ≤32000cm 3 。
In the present embodiment, W 1 *T 1 *K 1 Can be 3200cm 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 And the like, or a range value between any two.
In this embodiment 3200cm 3 ≤W 1 *T 1 *K 1 ≤32000cm 3 The requirements of the structural strength of the housing 211 and the heating value of the battery cell 21 are considered, the structural strength of the housing 211 is further improved, and the risk of damage to the overcurrent element in the circuit is reduced.
In some embodiments, 3720cm 3 ≤W 1 *T 1 *K 1 ≤12500cm 3 。
In the present embodiment, W 1 *T 1 *K 1 Can be 3720cm 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 And the like, or a range value between any two.
In some embodiments 4000cm 3 ≤W 1 *T 1 *K 1 ≤6000cm 3 。
In this embodiment, 4000cm may be used 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 And the like, or a range value between any two.
In some embodiments, the positive electrode material of the battery cell 21 includes a lithium-containing phosphate, satisfying: c is not less than 350Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c))≥118Ah/L。
In the case where the positive electrode material of the battery cell 21 includes a lithium-containing phosphate and C.gtoreq.350 Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is set at 118Ah/L or more, which can increase the volume ratio of the internal space of the housing 211 of the battery cell 21, and is advantageous in realizing a ratio of the volume of the internal space of the housing 211 of the battery cell 21 to the volume of the housing 211 of 90% or more.
In some embodiments, the positive electrode material of the battery cell 21 includes a lithium transition metal oxide, satisfying: c is greater than or equal to 650Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c))≥190Ah/L。
In the case where the positive electrode material of the battery cell 21 includes a lithium transition metal oxide and C.gtoreq.650Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is set to 190Ah/L or more, which can increase the volume ratio of the internal space of the housing 211 of the battery cell 21, and is advantageous in realizing a ratio of the volume of the internal space of the housing 211 of the battery cell 21 to the volume of the housing 211 of 90% or more.
In some embodiments, the battery cell 21 is a sodium ion battery cell, satisfying: c is greater than or equal to 260Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c))≥87Ah/L。
In the case that the battery cell 21 is a sodium ion battery cell and C is not less than 260Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c)) is set at 87Ah/L or more, which can increase the volume ratio of the internal space of the housing 211 of the battery cell 21, and is advantageous in realizing a ratio of the volume of the internal space of the housing 211 of the battery cell 21 to the volume of the housing 211 of 90% or more.
In addition, the embodiment of the present application provides an energy storage system 100, including an energy storage converter 20 and the energy storage devices 10 provided in any one of the M embodiments, where the energy storage devices 10 are electrically connected to the energy storage converter 20.
Wherein M is a positive integer, and M can be 1, 2, 3, 4, 5, 6, 7, 8, etc.
In some embodiments, m=2, a=2; or, m=4, a=4; or, m=8, a=8.
In addition, the embodiment of the application further provides an energy storage device 10, the energy storage device 10 is used for electrically connecting the energy storage converter 20, the energy storage converter 20 can be used for being matched with M energy storage devices 10, M is a positive integer, rated output power of the energy storage converter 20 is P, the unit is W, energy of the energy storage device 10 is Q, the unit is Wh, and the duration of discharging the energy storage device 10 from a full charge state to a full discharge state is A, and the unit is h. The energy storage device 10 includes a case 1 and a plurality of batteries 2, the case 1 includes a battery compartment 11, and the plurality of batteries 2 are accommodated in the battery compartment 11. The battery 2 includes a case 1 and a plurality of battery cells 21 accommodated in the case 1. The capacity of the battery cell 21 is C, the unit is Ah, and the platform voltage of the battery cell 21 is U 0 The unit is V. The battery compartment 11 accommodates N 1 The cells 2, N 1 The individual cells 2 are denoted by X 1 A plurality of parallel-connected first battery packs 2a, each first battery pack 2a being formed of Y 1 The cells 2 are connected in series to form N 1 ＝X 1 *Y 1 . The battery 2 includes N 2 Individual battery cells 21, N 2 Each battery cell 21 is formed by Y 2 A plurality of second battery cell groups 21b connected in series, each second battery cell group 21b being formed of X 2 The battery cells 21 are connected in parallel to form N 2 ＝X 2 *Y 2 ，Q＝N 1 *N 2 *C*U 0 . The maximum operating voltage on the dc side of the energy storage converter 20 is U 1 The minimum operating voltage on the dc side of the energy storage converter 20 is U 2 ，U 2 ＜U 0 *Y 1 *Y 2 ＜U 1 。
Wherein the positive electrode material of the battery cell 21 comprises lithium iron phosphate, p=4900000w, m=a= 4,U 1 ＝1500V，U 2 ＝900V，C＝530Ah，U 0 ＝3.23，X 1 ＝4，Y 1 ＝8，X 2 ＝2，Y 2 ＝52，P/(M*Q/A)＝P/(M*X 1 *Y 1 *X 2 *Y 2 *C*U 0 /A)＝0.86。
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
The above embodiments are only for illustrating the technical solution of the present application, and are not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (71)
1. The utility model provides an energy storage device for electrically connect energy storage converter, energy storage converter can be used for with M energy storage device cooperation, M is positive integer, its characterized in that, energy storage converter's rated output is P, and the unit is W, energy storage device's energy is Q, and the unit is Wh, energy storage device discharges from full charge state to the duration of full discharge state be A, and the unit is h, satisfies: P/(M.times.Q/A) is less than or equal to 0.7 and less than or equal to 0.99;
Wherein, energy storage device includes:
the box body comprises a battery compartment;
at least one battery, accommodated in the battery compartment, the battery comprising at least one battery cell;
the capacity of the battery monomer is C, the unit is Ah, and the platform voltage of the battery monomer is U 0 The unit is V, the number of the battery monomers in the battery compartment is N, and Q=N×C×U 0 。
2. The energy storage device of claim 1, wherein 0.75 +.p/(M Q/a) +.0.95.
3. The energy storage device of claim 2, wherein 0.85 +.p/(M Q/a) +.0.93.
4. The energy storage device of claim 1, wherein the battery compartment comprisesWith N in 1 Each of the batteries, N 1 Each of the batteries is composed of X 1 A plurality of first battery packs connected in parallel, each of the first battery packs being formed of Y 1 The batteries are connected in series; or, N 1 Each of the batteries is composed of Y 1 A plurality of second battery packs connected in series, each of the second battery packs being formed of X 1 Each of the batteries is formed by parallel connection, and the following conditions are satisfied: n (N) 1 ≥1，X 1 ≥1，Y 1 ≥1，N 1 ＝X 1 *Y 1 ；
The battery includes N 2 Each of the battery cells, N 2 Each battery cell is composed of X 2 A plurality of first battery cell groups connected in parallel, each first battery cell group is formed by Y 2 The battery cells are formed by connecting the battery cells in series; or, N 2 Each battery cell is composed of Y 2 A plurality of second battery cell groups connected in series, each of the second battery cell groups being formed of X 2 Each battery cell is formed by connecting in parallel, and the following conditions are satisfied: n (N) 2 ≥1，X 2 ≥1，Y 2 ≥1，N 2 ＝X 2 *Y 2 ，N＝N 1 *N 2 。
5. The energy storage device of claim 4, wherein a maximum operating voltage of a dc side of said energy storage converter is U when said energy storage device is charged 1 The minimum working voltage of the direct current side of the energy storage converter is U 2 The method comprises the following steps: u (U) 2 ＜U 0 *Y 1 *Y 2 ＜U 1 。
6. The energy storage device according to claim 5, wherein the positive electrode material of the battery cell comprises lithium-containing phosphate, 2.8V +.u ≡ 0 ≤3.6V，250≤Y 1 *Y 2 ≤468。
7. The energy storage device of claim 6, wherein the positive electrode material of the battery cell comprises lithium iron phosphate, 3.1V ∈u 0 ≤3.3V，400≤Y 1 *Y 2 ≤424。
8. The energy storage device of claim 6, wherein 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 ≤18。
9. The energy storage device of claim 8, wherein X is 1 ＝1。
10. The energy storage device of claim 9, wherein X is 2 ＝1，2000Ah≤C≤11000Ah。
11. The energy storage device of claim 10, wherein 2500Ah is less than or equal to C is less than or equal to 6000Ah.
12. The energy storage device of claim 9, wherein X is 2 ＝2，1000Ah≤C≤5500Ah。
13. The energy storage device of claim 12, wherein 2000Ah is less than or equal to C is less than or equal to 4000Ah.
14. The energy storage device of claim 8, wherein 2.ltoreq.x 1 ≤6。
15. The energy storage device of claim 14, wherein X is 1 ＝4，X 2 ＝1，500Ah≤C≤2600Ah。
16. The energy storage device of claim 15, wherein 800Ah is less than or equal to C is less than or equal to 1500Ah.
17. The energy storage device of claim 14, wherein X is 1 ＝4，X 2 ＝2，250Ah≤C≤1300Ah。
18. The energy storage device of claim 17, wherein 350Ah is less than or equal to C is less than or equal to 1000Ah.
19. The energy storage device of claim 18, wherein 500Ah is less than or equal to C is less than or equal to 700Ah.
20. The energy storage device of claim 14, wherein X is 1 The first battery packs are arranged along the length direction of the box body.
21. The energy storage device of claim 20, wherein said battery compartment comprises a plurality of sub-compartments, said plurality of sub-compartments being arranged along a length of said housing, each of said sub-compartments housing one of said first battery packs along a length of said housing.
22. The energy storage device according to claim 5, wherein the positive electrode material of the battery cell comprises lithium transition metal oxide, and wherein 2.8V +.u 0 ≤4.35V，210≤Y 1 *Y 2 ≤530。
23. The energy storage device of claim 22, wherein 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 ≤18。
24. The energy storage device of claim 23, wherein X is 1 ＝1。
25. The energy storage device of claim 24, wherein X is 2 ＝1，1500Ah≤C≤13400Ah。
26. The energy storage device of claim 25, wherein 3000Ah is less than or equal to C is less than or equal to 7000Ah.
27. The energy storage device of claim 24, wherein X is 2 ＝2，750Ah≤C≤6670Ah。
28. The energy storage device of claim 27, wherein 1800Ah is less than or equal to C is less than or equal to 4000Ah.
29. The energy storage device of claim 23, wherein 2 +.x 1 ≤6。
30. The energy storage device of claim 29, wherein X is 1 ＝4，X 2 ＝1，375Ah≤C≤3300Ah。
31. The energy storage device of claim 30, wherein 700Ah is less than or equal to C is less than or equal to 1600Ah.
32. The energy storage device of claim 29, wherein X is 1 ＝4，X 2 ＝2，200Ah≤C≤1600Ah。
33. The energy storage device of claim 32, wherein 340Ah is less than or equal to C is less than or equal to 1050Ah.
34. The energy storage device of claim 33, wherein 490Ah is less than or equal to C is less than or equal to 720Ah.
35. The energy storage device of claim 29, wherein X is 1 The first battery packs are arranged along the length direction of the box body.
36. The energy storage device of claim 35, wherein said battery compartment comprises a plurality of sub-compartments, said plurality of sub-compartments being arranged along a length of said housing, each of said sub-compartments housing one of said first battery packs along a length of said housing.
37. The energy storage device of claim 5, wherein the battery cell is a sodium ion battery cell, 1.5V +.u ≡ 0 ≤4V，230≤Y 1 *Y 2 ≤1000。
38. The energy storage device of claim 37, wherein 3.5 x 10 6 W≤P≤7.5*10 6 W，M＝A，1≤X 1 *X 2 ≤18。
39. The energy storage device of claim 38, wherein X is 1 ＝1。
40. The energy storage device of claim 39, wherein X is 2 ＝1，1200Ah≤C≤18000Ah。
41. The energy storage device of claim 40, wherein 2000Ah is less than or equal to C is less than or equal to 10000Ah.
42. The energy storage device of claim 39, wherein X is 2 ＝2，600Ah≤C≤9000Ah。
43. The energy storage device of claim 42, wherein 1600Ah is less than or equal to C is less than or equal to 4000Ah.
44. The energy storage device of claim 38, wherein 2 +.x 1 ≤6。
45. The energy storage device of claim 44, wherein X is 1 ＝4，X 2 ＝1，300Ah≤C≤4000Ah。
46. The energy storage device of claim 45, wherein 700Ah is less than or equal to C is less than or equal to 1500Ah.
47. The energy storage device of claim 46, wherein X is 1 ＝4，X 2 ＝2，150Ah≤C≤1500Ah。
48. The energy storage device of claim 47, wherein 350 Ah.ltoreq.C.ltoreq.1200 Ah.
49. The energy storage device of claim 48, wherein 400Ah is less than or equal to C is less than or equal to 650Ah.
50. The energy storage device of claim 44, wherein X is 1 The first battery packs are arranged along the length direction of the box body.
51. The energy storage device of claim 50, wherein said battery compartment comprises a plurality of sub-compartments, said plurality of sub-compartments being arranged along a length of said housing, each of said sub-compartments housing one of said first battery packs along a length of said housing.
52. The energy storage device of claim 4, wherein said battery compartment accommodates only one of said first battery packs in a height direction of said housing, Y in each of said first battery packs 1 The batteries are distributed along the height direction of the box body, and Y is more than or equal to 2 1 ≤10。
53. The energy storage device according to any one of claims 1-52, wherein the battery cell comprises a housing and at least one electrode assembly, the electrode assembly being housed within the housing;
the housing has a rectangular parallelepiped shape, and has a dimension W in a first direction 1 The dimension of the shell in the second direction is T 1 The dimension of the shell in the third direction is K 1 One of the first direction, the second direction and the third direction is parallel to the length direction of the box body, the other is parallel to the width direction of the box body, and the other is parallel to the height direction of the box body;
The housing includes a first wall and a second wall disposed opposite each other in the first direction, a third wall and a fourth wall disposed opposite each other in the second direction, a fifth wall and a sixth wall disposed opposite each other in the third direction, the first wall and the fourth wall are disposed opposite each other in the second directionThe sum of the thicknesses of the walls and the second wall is a, the sum of the thicknesses of the third wall and the fourth wall is b, and the sum of the thicknesses of the fifth wall and the sixth wall is c, satisfying: (W) 1 -a)*(T 1 -b)*(K 1 -c)/(W 1 *T 1 *K 1 )≥90％。
54. The energy storage device of claim 53, wherein (W) 1 -a)/W 1 ≥97.0％，(T 1 -b)/T 1 More than or equal to 96.5 percent, and (K) 1 -c)/K 1 ≥96.5％。
55. An energy storage device as defined in claim 53, wherein said housing includes a shell and an end cap, said shell having an opening, said end cap covering said opening;
the shell comprises the first wall, the second wall, the third wall, the fourth wall and the fifth wall which are integrally formed, and the end cover is the sixth wall.
56. The energy storage device as defined in claim 55, wherein said battery cell further comprises a first insulator and a second insulator, said first insulator disposed between and abutting said fifth wall and said electrode assembly; the second insulator is arranged between the sixth wall and the electrode assembly and is abutted against the sixth wall;
The maximum dimension of the first insulating member in the third direction is e 1 The maximum dimension of the second insulating member in the third direction is e 2 The method comprises the following steps: (W) 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 )≥88％，0.3mm≤e 1 Less than or equal to 1.2mm, and less than or equal to 2mm and less than or equal to e 2 ≤10mm。
57. The energy storage device as defined in claim 55, wherein said battery cell further comprises a first insulator and a second insulator, said first insulator disposed between and abutting said fifth wall and said electrode assembly; the second insulator is arranged between the sixth wall and the electrode assembly and is abutted against the sixth wall;
the maximum dimension of the first insulating member in the third direction is e 1 The maximum dimension of the second insulating member in the third direction is e 2 The method comprises the following steps: (W) 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 1 -e 2 )/(W 1 *T 1 *K 1 )≥85％，0.3mm≤e 1 Less than or equal to 1.2mm, and less than or equal to 2mm and less than or equal to e 2 ≤10mm。
58. The energy storage device as defined in claim 55, wherein W 1 ≥T 1 The first direction is parallel to the length direction of the box body, the second direction is parallel to the width direction of the box body, and the third direction is parallel to the height direction of the box body.
59. The energy storage device as defined in claim 53, wherein said housing comprises a shell and two end caps, said shell having two openings disposed opposite each other in said third direction, two of said end caps respectively covering two of said openings;
The shell comprises a first wall, a second wall, a third wall and a fourth wall which are integrally formed, and the two end covers are the fifth wall and the sixth wall respectively.
60. The energy storage device of claim 59, wherein said battery cell further comprises a third insulator and a fourth insulator, said third insulator disposed between and abutting said fifth wall and said electrode assembly; the fourth insulator is arranged between the sixth wall and the electrode assembly and is abutted against the sixth wall;
the maximum dimension of the third insulating member in the third direction is e 3 The fourth insulator is in the third directionIs of maximum dimension e 4 The method comprises the following steps: (W) 1 -a-1.6mm)*(T 1 -b-1.6mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 )≥88％，2mm≤e 3 Less than or equal to 10mm and less than or equal to 2mm and less than or equal to e 4 ≤10mm。
61. The energy storage device of claim 59, wherein said battery cell further comprises a third insulator and a fourth insulator, said third insulator disposed between and abutting said fifth wall and said electrode assembly; the fourth insulator is arranged between the sixth wall and the electrode assembly and is abutted against the sixth wall;
the maximum dimension of the third insulating member in the third direction is e 3 The maximum dimension of the fourth insulating member in the third direction is e 4 The method comprises the following steps: (W) 1 -a-4mm)*(T 1 -b-4mm)*(K 1 -c-e 3 -e 4 )/(W 1 *T 1 *K 1 )≥85％，2mm≤e 3 Less than or equal to 10mm and less than or equal to 2mm and less than or equal to e 4 ≤10mm。
62. The energy storage device as defined in claim 59, wherein W 1 ≥T 1 The first direction is parallel to the height direction of the box body, the second direction is parallel to the width direction of the box body, and the third direction is parallel to the length direction of the box body.
63. The energy storage device of claim 53, wherein 3000cm 3 ≤W 1 *T 1 *K 1 ≤40000cm 3 。
64. The energy storage device as defined in claim 63, wherein 3200cm 3 ≤W 1 *T 1 *K 1 ≤32000cm 3 。
65. The energy storage device of claim 64, wherein,3720cm 3 ≤W 1 *T 1 *K 1 ≤12500cm 3 。
66. the energy storage device of claim 65, wherein 4000cm 3 ≤W 1 *T 1 *K 1 ≤6000cm 3 。
67. The energy storage device of claim 53, wherein the positive electrode material of said battery cell comprises a lithium-containing phosphate, such that: c is not less than 350Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c))≥118Ah/L。
68. The energy storage device as defined in claim 53, wherein the positive electrode material of said battery cell comprises a lithium transition metal oxide, such that: c is greater than or equal to 650Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c))≥190Ah/L。
69. The energy storage device as defined in claim 53, wherein said cells are sodium ion cells, satisfying: c is greater than or equal to 260Ah, C/((W) 1 -a)*(T 1 -b)*(K 1 -c))≥87Ah/L。
70. An energy storage system, comprising:
an energy storage converter;
m energy storage devices according to any one of claims 1-69, said energy storage devices being electrically connected to said energy storage converter.
71. The energy storage system of claim 70, wherein M = 2, a = 2; or, m=4, a=4; or, m=8, a=8.
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