Energy storage system applied to echelon utilization of power battery in low-temperature environment

Abstract

The utility model provides an energy storage system applied to cascade utilization of a power battery in a low-temperature environment, and relates to the field of energy storage equipment. The power battery echelon utilization energy storage system applied to the low-temperature environment comprises a heat preservation container, at least one echelon power battery pack and adjustable cluster frames, wherein the number of the adjustable cluster frames is equal to that of the echelon power battery packs; the adjustable cluster frame comprises a main frame and a movable beam, and the movable beam is connected with the echelon power battery pack and is adjustably connected with the main frame; the heat preservation container comprises a plurality of cabin bodies, and the main frame is installed in one cabin body. A door body is hinged to the open end of the cabin body, and a door seal assembly is installed between the door body and the cabin body. The power battery echelon utilization energy storage system applied to the low-temperature environment provided by the utility model solves the technical problems of insufficient echelon utilization of the power battery and insufficient low-temperature environment resistance in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy storage devices, in particular to an energy storage system for power battery step utilization in low temperature environment. BACKGROUND

[0002] According to the use standard of power batteries, the power batteries need to be recycled when the remaining capacity is less than 80%; in the prior art, the recycled power batteries are crushed to extract high-value metal materials or are step utilized; the crushing of the recycled power batteries has the problems of environmental pollution and resource waste; when the recycled power batteries are step utilized as energy of an energy storage cabinet or other energy storage system, the power batteries have poor low temperature resistance, the battery capacity drops sharply when the power batteries are operated in an environment below zero degrees, and the efficiency of the energy storage system is affected; and the energy storage system cannot be compatible with power batteries of different specifications. CONTENT OF THE UTILITY MODEL

[0003] The purpose of the embodiments of the present application is to provide an energy storage system for power battery step utilization in low temperature environment, so as to alleviate the technical problems of insufficient power battery step utilization and insufficient low temperature resistance in the prior art.

[0004] In order to solve the above technical problems, the technical scheme provided by the present application is:

[0005] The energy storage system for power battery step utilization in low temperature environment provided by the present application comprises a heat preservation container, at least one step power battery pack, and an adjustable cluster frame equal in number to the step power battery packs;

[0006] The adjustable cluster frame comprises a main frame and movable beams, the movable beams are connected with the step power battery packs, and are adjustably connected with the main frame;

[0007] The heat preservation container comprises a plurality of cabin bodies, the main frame is installed in one of the cabin bodies, the opening end of the cabin body is hinged with a door body, and a door seal assembly is installed between the door body and the cabin body.

[0008] Further, the main frame comprises two longitudinal beams and a plurality of transverse beams, the two longitudinal beams are arranged in parallel and at intervals, the plurality of transverse beams are arranged at intervals along the axial direction of the longitudinal beams, and both ends of each transverse beam are connected with the two longitudinal beams respectively;

[0009] Two movable beams are adjustably installed between adjacent two transverse beams, the two movable beams are arranged in parallel and at intervals with the longitudinal beams and are located between the two longitudinal beams;

[0010] Each of the cross beams is provided with a plurality of first mounting holes arranged along the axial direction of the cross beam, the two ends of the movable beam are provided with connecting protrusions, and the connecting protrusions are provided with second mounting holes, and a first fastener passes through the second mounting holes and the corresponding first mounting holes to be connected.

[0011] Further, the adjustable cluster frame further comprises a fixing member, and the movable beam is provided with third mounting holes arranged along the axial direction of the movable beam, and a second fastener passes through the fixing member and the corresponding third mounting holes to be connected.

[0012] The side wall of the gradient power battery pack is provided with a hanging ear, and a third fastener passes through the hanging ear and the fixing member to be connected.

[0013] Further, at least one roller is mounted on the bottom of the main frame.

[0014] Further, at least one guide wheel is mounted on each of the two opposite side walls of the main frame.

[0015] Further, a plurality of guide wheels are mounted on each of the two opposite side walls of the main frame, and the sizes of the plurality of guide wheels on the two sides gradually decrease along the extension direction of the side wall on which the guide wheels are mounted.

[0016] Further, the door seal assembly comprises a D-shaped door seal strip, a magnetic door seal strip and a heating resistance wire.

[0017] The D-shaped door seal strip surrounds the outer edge of the cabin body, the heating resistance wire is mounted on the side wall of the cabin body, and the magnetic door seal strip is mounted on the surface of the door body opposite to the cabin body.

[0018] Further, the door seal assembly further comprises a water guide member and a pressing member, one end of the water guide member is mounted on the surface of the cabin body opposite to the door body and located outside the magnetic door seal strip, the other end of the water guide member is connected with the pressing member, and the water guide member is provided with a water guide groove.

[0019] Further, the energy storage system for gradient utilization of power batteries in a low-temperature environment further comprises a liquid cooling system, which is mounted in the cabin body adjacent to the cabin body in which the gradient power battery pack is mounted, and is used for heat exchange of the gradient power battery pack.

[0020] Further, the energy storage system for gradient utilization of power batteries in a low-temperature environment further comprises a number of bidirectional converters equal to the number of the gradient power battery packs.

[0021] The bidirectional converters are mounted in the cabin body adjacent to the cabin body in which the gradient power battery pack is mounted, and the bidirectional converters are electrically connected with the gradient power battery packs one by one.

[0022] In combination with the above technical solutions, the technical effects achieved by the utility model are analyzed as follows:

[0023] The energy storage system for power battery stepwise utilization under low-temperature environment provided by the utility model comprises a heat preservation container, at least one stepwise power battery pack and an adjustable cluster frame equal in number to the stepwise power battery packs; the adjustable cluster frame comprises a main frame and a movable beam, the movable beam is connected with the stepwise power battery pack and adjustably connected with the main frame; the heat preservation container comprises a plurality of cabin bodies, and the main frame is installed in one of the cabin bodies; the opening end of the cabin body is hinged with a door body, and a door seal assembly is installed between the door body and the cabin body. The energy storage system for power battery stepwise utilization under low-temperature environment selects the battery pack meeting the standard as the stepwise power battery pack for stepwise utilization after the retired power battery pack is detected; the stepwise power battery pack is assembled with the movable beam in the adjustable cluster frame, because the movable beam is adjustably connected with the main frame, the stepwise power battery packs of different sizes can be installed on the main frame; the main frame with the stepwise power battery pack is installed in the heat preservation container, the heat preservation container has heat preservation performance and can keep the temperature in the cabin body suitable for the normal work of the stepwise power battery pack; and the door seal assembly is installed between the cabin body and the door body, improving the heat preservation performance and making the energy storage system for power battery stepwise utilization under low-temperature environment applicable to the low-temperature environment.

[0024] The stepwise power battery pack is a recycled power battery, realizing the stepwise utilization of the power battery, which can not only greatly reduce the pollution to the environment, but also effectively avoid the waste of resources and maximize the economic benefits.

[0025] The movable beam in the adjustable cluster frame is adjustably connected with the main frame, and the stepwise power battery pack is installed on the movable beam, realizing that the adjustable cluster frame is applicable to the stepwise power battery packs of different sizes, improving the compatibility of the adjustable cluster frame and realizing that the energy storage system for power battery stepwise utilization under low-temperature environment is compatible with the stepwise power battery packs of multiple different sizes.

[0026] The stepwise power battery pack is located in the cabin body of the heat preservation container, the heat preservation container itself has heat preservation performance, and the door seal assembly is installed between the cabin body and the door body, the door seal assembly seals the gap between the cabin body and the door body, avoiding the problem of heat transfer at the gap between the cabin body and the door body, and realizing the function that the energy storage system for power battery stepwise utilization under low-temperature environment normally operates under the low-temperature environment and the capacity of the stepwise power battery pack does not attenuate. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0028] Figure 1 A front view of the energy storage system for the step-by-step utilization of the power battery applied in the low-temperature environment provided by the embodiments of the present application;

[0029] Figure 2 A top view of the energy storage system for the step-by-step utilization of the power battery applied in the low-temperature environment provided by the embodiments of the present application;

[0030] Figure 3 An assembly schematic of the step-by-step power battery pack and the adjustable cluster frame provided by the embodiments of the present application Figure 1 .

[0031] Figure 4 A schematic of the adjustable cluster frame provided by the embodiments of the present application Figure 1 .

[0032] Figure 5 A partial enlarged view of A in Figure 4 .

[0033] Figure 6 A partial enlarged view of B in Figure 4 .

[0034] Figure 7 A schematic of the adjustable cluster frame provided by the embodiments of the present application Figure 2 .

[0035] Figure 8 A schematic of the adjustable cluster frame provided by the embodiments of the present application Figure 3 .

[0036] Figure 9 A schematic of the adjustable cluster frame provided by the embodiments of the present application Figure 4 .

[0037] Figure 10 A cross section of the heat preservation container provided by the embodiments of the present application Figure 1 .

[0038] Figure 11 A cross section of the heat preservation container provided by the embodiments of the present application Figure 2 .

[0039] Figure 12 An assembly schematic of the step-by-step power battery pack and the adjustable cluster frame provided by the embodiments of the present application Figure 2 .

[0040] Icon:

[0041] 100 - thermal container; 110 - cabin body; 120 - door body; 130 - door seal assembly; 131 - D-shaped door seal strip; 132 - magnetic door seal strip; 133 - heating resistance wire; 134 - water guide; 135 - water guide groove; 136 - pressing member;

[0042] 200 - power battery pack; 210 - ear hook;

[0043] 300 - adjustable cluster frame; 310 - main frame; 311 - longitudinal beam; 312 - cross beam; 313 - first mounting hole; 314 - middle beam; 320 - movable beam; 321 - connecting protrusion; 322 - second mounting hole; 323 - third mounting hole; 330 - fixing member; 340 - roller; 350 - guide wheel;

[0044] 410 - liquid cooling system; 420 - bidirectional converter; 421 - adapter terminal; 430 - power distribution cabinet. DETAILED DESCRIPTION

[0045] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0046] In the description of the present application, it should be noted that the positions or location relationships indicated by the terms "inner", "outer" and the like are based on the positions or location relationships shown in the drawings, or the positions or location relationships commonly placed when the products of the present application are used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated devices or elements must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] With the rapid development of new energy vehicle field, the consumption of power battery is obviously increased. According to the standard, the power battery must be replaced when the residual capacity is less than 80%. With the increasing number of replaced power batteries, the recycling and reuse of power batteries become a new problem. The cascade utilization of power battery not only can greatly reduce the pollution to the environment, but also can effectively avoid the waste of resources, and realize the maximization of economic benefits. In some areas, the temperature will suddenly decrease in winter, which can reach below-30℃, or even below-40℃. Since the suitable working temperature of lithium iron phosphate battery is between 25-35℃, and the low temperature resistance is poor, the battery capacity will decrease sharply in the environment below zero degree; in the environment below-20℃, the battery capacity attenuation reaches 50%, which seriously affects the efficiency of energy storage system.

[0049] Therefore, according to the prior art, the application embodiment provides a power battery cascade utilization energy storage system applied in low temperature environment, which comprises a heat preservation container 100, at least one cascade power battery pack 200 and a number of adjustable cluster frames 300 equal to the number of the cascade power battery packs 200. Figure 1 and Figure 2 The adjustable cluster frame 300 comprises a main frame 310 and a movable beam 320, the movable beam 320 is connected with the cascade power battery pack 200, and is adjustably connected with the main frame 310; the heat preservation container 100 comprises a plurality of cabin bodies 110, and the main frame 310 is installed in one of the cabin bodies 110; the opening end of the cabin body 110 is hinged with a door body 120, and a door seal assembly 130 is installed between the door body 120 and the cabin body 110. The cascade power battery pack 200 is a lithium iron phosphate power battery pack, of course, other material battery packs are also within the protection scope of the application embodiment. The power battery cascade utilization energy storage system applied in low temperature environment is a lithium iron phosphate energy storage system which can normally operate and has no capacity attenuation in the low temperature environment below-40℃.

[0050] Specifically, the assembly method of the power battery cascade utilization energy storage system applied in low temperature environment comprises the following steps: firstly, performing health detection on the recycled power battery pack; firstly, visually checking the appearance of the power battery pack, the appearance needs to be complete, without missing parts, deformation, cracks, liquid leakage and other problems; performing capacity and charge-discharge test on the power battery pack with qualified appearance, detecting the performance of the power battery pack and recording; performing air tightness detection on the power battery pack with qualified performance, which needs to reach IP67 level, labeling the qualified power battery pack, and the qualified power battery pack is the above-mentioned cascade power battery pack 200. Then, the cascade power battery pack 200 is installed on the adjustable cluster frame 300. Finally, the door body 120 is opened, the adjustable cluster frame 300 loaded with the cascade power battery pack 200 is installed in the cabin body 110 of the heat preservation container 100, and the door body 120 is closed.

[0051] The energy storage system applied to the low-temperature environment and the gradient utilization of power batteries selects the battery pack meeting the standard as the gradient power battery pack 200 for the gradient utilization after the retired power battery pack is detected; the gradient power battery pack 200 is assembled with the movable beam 320 in the adjustable cluster frame 300, because the movable beam 320 is adjustably connected with the main frame 310, so that the gradient power battery pack 200 of different sizes can be installed on the main frame 310; the main frame 310 with the gradient power battery pack 200 fixed is installed in the heat preservation container 100, the heat preservation container 100 has the heat preservation performance, can keep the temperature in the cabin body 110 suitable for the normal work of the gradient power battery pack 200; and the door seal assembly 130 is installed between the cabin body 110 and the door body 120, the heat preservation performance is improved, so that the energy storage system applied to the low-temperature environment and the gradient utilization of power batteries can be applied to the low-temperature environment. The gradient power battery pack 200 is the recycled power battery, realizes the gradient utilization of the power battery, can not only greatly reduce the pollution to the environment, but also can effectively avoid the resource waste, realizes the maximization of economic benefits. The movable beam 320 in the adjustable cluster frame 300 is adjustably connected with the main frame 310, and the gradient power battery pack 200 is installed on the movable beam 320, so that the adjustable cluster frame 300 can be applied to the gradient power battery pack 200 of different sizes, the compatibility of the adjustable cluster frame 300 is improved, the energy storage system applied to the low-temperature environment and the gradient utilization of power batteries can be compatible with the gradient power battery pack 200 of multiple different sizes. The gradient power battery pack 200 is located in the cabin body 110 of the heat preservation container 100, the heat preservation container 100 itself has the heat preservation performance, and the door seal assembly 130 is installed between the cabin body 110 and the door body 120, the gap between the cabin body 110 and the door body 120 is sealed by the door seal assembly 130, the heat transfer problem of the gap between the cabin body 110 and the door body 120 is avoided, the energy storage system applied to the low-temperature environment and the gradient utilization of power batteries can normally run in the low-temperature environment and the capacity of the gradient power battery pack 200 is not attenuated.

[0052] The structure of the energy storage system applied to the low-temperature environment and the gradient utilization of power batteries is described in detail as follows:

[0053] In the optional scheme of the utility model embodiment, see Figures 3 to 5The main frame 310 comprises two longitudinal beams 311 and a plurality of cross beams 312, the two longitudinal beams 311 are arranged in parallel and at intervals, the plurality of cross beams 312 are arranged at intervals along the axial direction of the longitudinal beams 311, and the two ends of each cross beam 312 are connected with the two longitudinal beams 311 respectively; two movable beams 320 are adjustably arranged between the two adjacent cross beams 312, the two movable beams 320 are arranged in parallel and at intervals with the longitudinal beams 311 and are located between the two longitudinal beams 311; each cross beam 312 is provided with a plurality of first mounting holes 313 arranged at intervals along the axial direction of the cross beam 312, the two ends of the movable beam 320 are provided with connecting protrusions 321, and the connecting protrusions 321 are provided with second mounting holes 322, and the first fasteners pass through the second mounting holes 322 and the corresponding first mounting holes 313 to be connected.

[0054] Specifically, the longitudinal beams 311 and the plurality of cross beams 312 are made of seamless steel pipes and have sufficient rigidity to bear the step power battery pack 200; the longitudinal beams 311 and the cross beams 312 are welded to improve the connection strength. The side of the cross beam 312 connected with the movable beam 320 is provided with the first mounting hole 313, and the first mounting hole 313 is a threaded hole; the first fastener is a screw or a bolt, and the screw is screwed with the corresponding first mounting hole 313 after passing through the second mounting hole 322. Preferably, the opposite two side walls of the two ends of the movable beam 320 are provided with the connecting protrusions 321, the two connecting protrusions 321 are provided with the second mounting holes 322, and the two connecting protrusions 321 are connected with the cross beam 312 through the first fastener, thereby enhancing the connection strength of the movable beam 320 and the cross beam 312. During installation, the two movable beams 320 are adjusted to appropriate positions according to the size of the step power battery pack 200, and then the two movable beams 320 are connected with the corresponding first mounting holes 313 on the cross beam 312. Preferably, the main frame 310 further comprises an intermediate beam 314, the intermediate beam 314 is located between the two longitudinal beams 311 and is connected with the cross beam 312, thereby enhancing the strength of the main frame 310.

[0055] The side of the cross beam 312 connected with the movable beam 320 is provided with a row of first mounting holes 313 in advance, and the movable beam 320 is connected with the cross beam 312 through the second mounting hole 322 and is adjustable; by adjusting the position of the movable beam 320, different sizes of the step power battery pack 200 can be adapted.

[0056] In the optional scheme of the utility model embodiment, referring to Figure 4 and Figure 6 The adjustable cluster frame 300 further comprises a fixing member 330, the movable beam 320 is provided with a third mounting hole 323 arranged at intervals along the axial direction of the movable beam 320, and the second fixing member 330 passes through the fixing member 330 and is connected with the corresponding third mounting hole 323; the side wall of the step power battery pack 200 is provided with a lug 210, and the third fastener passes through the lug 210 and is connected with the fixing member 330.

[0057] Specifically, the third mounting hole 323 is set as a threaded hole, the second fixing member 330 is set as a screw or a bolt, and the screw is screwed with the corresponding third mounting hole 323 through the fixing member 330. The third fastener is set as a bolt.

[0058] A row of third mounting holes 323 are reserved on the upper surface of the movable beam 320, and the fixing member 330 is fastened with the corresponding third mounting hole 323 through the second fixing member 330, and meanwhile, the fixing member 330 is adjustable. The lug 210 of the step power battery pack 200 is fastened with the fixing member 330 through the third fastener.

[0059] In an optional scheme of the embodiment of the utility model, the bottom of the main frame 310 is provided with at least one roller 340.

[0060] As an implementation manner, the bottom of the main frame 310 is provided with one roller 340, and the roller 340 is installed at the central position of the main frame 310.

[0061] As another implementation manner, the bottom of the main frame 310 is provided with a plurality of rollers 340, and the plurality of rollers 340 are symmetrically installed on the main frame 310. Specifically, referring to Figure 7 and Figure 9 , the bottom of the main frame 310 is provided with six rollers 340, three on the left side and three on the right side, and the three rollers 340 on the left side and the three rollers 340 on the right side correspond to each other one by one. Preferably, the roller 340 is set as a heavy roller 340 to improve the supporting performance.

[0062] The bottom of the main frame 310 is provided with the roller 340, so that when the adjustable cluster frame 300 provided with the step power battery pack 200 is installed to the thermal insulation container 100, the main frame 310 can be easily pushed into the supporting frame of the cabin body 110, and the coating surface of the adjustable cluster frame 300 and the supporting frame will not be damaged, so that the corrosion and rust of the adjustable cluster frame 300 and the supporting frame are prevented.

[0063] In an optional scheme of the embodiment of the utility model, the two opposite side walls of the main frame 310 are each provided with at least one guide wheel 350.

[0064] As an implementation manner, the two opposite side walls of the main frame 310 are each provided with one guide wheel 350.

[0065] As another implementation manner, the two opposite side walls of the main frame 310 are each provided with a plurality of guide wheels 350, and the plurality of guide wheels 350 on the two sides are set in one-to-one correspondence.

[0066] As another implementation manner, the two opposite side walls of the main frame 310 are each provided with a plurality of guide wheels 350, and the size of the plurality of guide wheels 350 on the two sides gradually decreases along the extension direction of the side wall provided with the guide wheel 350. Specifically, referring toFigures 7 to 9 In the embodiment, six guide wheels 350 are arranged, three on each side of the main frame 310, and the three guide wheels 350 on a single side are gradually reduced in size from the front end to the rear end of the main frame 310, forming a tapered shape with the front larger and the rear smaller. When the adjustable cluster frame 300 provided with the stepped power battery pack 200 is installed to the support frame of the thermal insulation container 100, the rear end of the adjustable cluster frame 300 is first pushed into the cabin body 110, and the guide wheels 350 are adjusted in angle by contacting the side guide blocks of the support frame, so that the adjustable cluster frame 300 can be easily pushed to the designated position, and the subsequent adjustment steps are saved. Preferably, in the embodiment, the sizes of the three guide wheels 350 on a single side from the front end to the rear end are 1550 mm, 1530 mm and 1515 mm, respectively.

[0067] The two opposite side walls of the main frame 310 are each provided with a guide wheel 350, and the guide wheel 350 serves as a guide.

[0068] In the optional scheme of the embodiment of the utility model, referring to Figure 10 and Figure 11 The door seal assembly 130 comprises a D-shaped door seal strip 131, a magnetic door seal strip 132 and a heating resistance wire 133; the D-shaped door seal strip 131 is arranged around the outer edge of the cabin body 110, the heating resistance wire 133 is installed on the side wall of the cabin body 110, and the magnetic door seal strip 132 is installed on the surface opposite to the cabin body 110 of the door body 120.

[0069] Specifically, the outer side of the heat preservation container 100 is filled with a heat preservation layer made of rock wool and having a thickness of 100 mm; of course, the heat preservation layer can also have other thicknesses, which should be within the protection scope of the embodiments of the present application. The heat preservation layer can not only meet the fireproof requirement of the energy storage system and resist burning for 1.5 hours without burning through, but also can reduce the heat flow between the inner and outer sides of the heat preservation container 100, and reduce the heat exchange amount from the inside to the outside environment in the case of high external temperature. The door body 120 of the heat preservation container 100 is used to install internal parts, and a gap is formed between the door body 120 and the cabin body 110. The D-shaped door seal strip 131 is arranged around the outer edge of the cabin body 110 to achieve an IP54 protection level. The inner side of the door body 120 is provided with a magnetic door seal strip 132, which is magnetically attracted and attached to the cabin body 110 when the door is closed, effectively preventing heat leakage from the inside to the outside; the magnetic door seal strip 132 includes a soft polyvinyl chloride sleeve and a magnetic adhesive strip, and the magnetic adhesive strip is magnetically attracted and attached to the cabin body 110. The heating resistance wire 133 is arranged beside the D-shaped door seal strip 131 on the side of the cabin body 110, and the heating resistance wire 133 is connected with the distribution box and controlled by the EMS system to turn on and off the power supply of the heating resistance wire 133; the NTC sensor is arranged on the shutter door of the cabin body 110 on the left side of the heat preservation container 100 for placing electrical components, and the sensor detects the temperature on the outside of the box body and transmits it to the EMS system; when the outside temperature is lower than -20℃, the EMS system sends a command, and the heating resistance wire 133 starts heating to melt the frost and snow on the D-shaped door seal strip 131, preventing the door body 120 and the D-shaped door seal strip 131 from freezing and being unable to open.

[0070] The D-shaped door seal strip 131 in the door seal assembly 130 realizes basic sealing; the magnetic door seal strip 132 realizes tight closing of the door body 120 and the cabin body 110, improving the sealing performance; and the heating resistance wire 133 realizes prevention of the problem that the door body 120 and the D-shaped door seal strip 131 are frozen and unable to open.

[0071] In the optional scheme of the embodiments of the present application, referring to Figure 11 , the door seal assembly 130 further includes a water guide 134 and a pressing member 136, one end of the water guide 134 is installed on the surface of the cabin body 110 opposite to the door body 120 and located on the outer side of the magnetic door seal strip 132, the other end of the water guide 134 is connected with the pressing member 136, and the water guide 134 is provided with a water guide groove 135.

[0072] Specifically, the water guide 134 is located at the side of the magnetic door seal 132, is arranged in a bent shape, and forms a water guide groove 135. The water guide 134 is formed by bending sheet metal. The compression member 136 is made of NBR foam, which further reduces the influence of insufficient thermal resistance of the D-type door seal 131. At the same time, when the heating resistance wire 133 works, it can heat the air in the gap between the cabin body 110 and the door body 120, prevent the internal hot air from pre-condensing dew at the water guide groove 135, and affect the normal work of the battery pack in the whole thermal insulation container 100 and the corrosion prevention of the thermal insulation container 100.

[0073] In an optional scheme of the embodiment of the utility model, the energy storage system for gradient utilization of power batteries in a low-temperature environment further comprises a liquid cooling system 410, the liquid cooling system 410 is installed in a cabin body 110 adjacent to the cabin body 110 in which the gradient power battery pack 200 is installed, and the liquid cooling system 410 is used to heat exchange the gradient power battery pack 200.

[0074] Specifically, in order to adapt to the extreme environment of severe cold, the gradient power battery pack 200 uses the liquid cooling system 410 for thermal management. In the environment of minus 40 DEG C, a 5KW liquid cooling unit that can operate at minus 40 DEG C is used to heat the gradient power battery pack 200, so that the temperature of the battery cell in the gradient power battery pack 200 is in the range of 20-30 DEG C, and the capacity does not attenuate.

[0075] The liquid cooling system 410 exchanges heat with the gradient power battery pack 200, cools or heats the gradient power battery pack 200, and enables the gradient power battery pack 200 to operate normally.

[0076] In an optional scheme of the embodiment of the utility model, the energy storage system for gradient utilization of power batteries in a low-temperature environment further comprises a liquid cooling system 410, the liquid cooling system 410 is installed in a cabin body 110 adjacent to the cabin body 110 in which the gradient power battery pack 200 is installed, and the liquid cooling system 410 is used to heat exchange the gradient power battery pack 200.

[0077] Specifically, the thermal insulation container 100 is provided with a plurality of cabin bodies 110, wherein the cabin body 110 on the right side is a battery cabin, a plurality of gradient power battery packs 200 can be placed, and the gradient power battery packs 200 can be used in multiple styles, and the cluster frame 300 can be adjusted to adapt to the gradient power battery pack 200. The left side is an electrical cabin, which includes a liquid cooling system 410, a bidirectional converter 420, a power distribution cabinet 430 and a fire extinguishing system. Among them, the liquid cooling system 410 and the bidirectional converter 420 need to be connected with the outside world because of the heat dissipation requirement, and cannot be completely sealed, so the equipment with a working range of minus 40 DEG C to 60 DEG C is selected. Figure 12When the adjustable cluster frame 300 is loaded into the thermal insulation container 100, the large current terminal is loaded into the front end of the adjustable cluster frame 300. The power harness output by the different specifications of the gradient power battery pack 200 is on the left side of the large current adapter terminal 421, and is connected through the adapter terminal 421, and can be converted into the same small diameter DC harness, and is output to the PCS end. After the harness is connected, the gradient power battery pack 200 can work normally, realizes the plug and play of the gradient power battery pack 200, and a pack of a bidirectional converter 420 working mode. When the gradient power battery pack 200 is replaced, the gradient power battery pack 200 can be replaced by only cutting off the power supply of the PCS, and other gradient power battery packs 200 are not affected.

[0078] The bidirectional converter 420 is electrically connected with the gradient power battery pack 200 one by one, and realizes the plug and play.

[0079] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0080] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An energy storage system applied to power battery step utilization in a low temperature environment, characterized in that, The application relates to a thermal insulation container (100), at least one gradient power battery pack (200) and an adjustable cluster frame (300) equal in number to the gradient power battery pack (200). The adjustable cluster frame (300) comprises a main frame (310) and movable beams (320), the movable beams (320) are connected with the gradient power battery pack (200) and adjustably connected with the main frame (310). The thermal insulation container (100) comprises a plurality of cabins (110), the main frame (310) is arranged in one of the cabins (110), the opening end of the cabin (110) is hinged with a door body (120), and a door seal assembly (130) is arranged between the door body (120) and the cabin (110). The main frame (310) comprises two longitudinal beams (311) and a plurality of cross beams (312), the two longitudinal beams (311) are arranged in parallel and at intervals, the plurality of cross beams (312) are arranged at intervals along the axial direction of the longitudinal beams (311), and the two ends of each cross beam (312) are connected with the two longitudinal beams (311) respectively. 2.The energy storage system for power battery cascade utilization applied in low temperature environment according to claim 1, characterized in that, Two movable beams (320) are adjustably arranged between two adjacent cross beams (312), the two movable beams (320) are arranged in parallel and at intervals and located between the two longitudinal beams (311). Each cross beam (312) is provided with a plurality of first mounting holes (313) arranged at intervals along the axial direction of the cross beam (312), the two ends of the movable beam (320) are provided with connecting protrusions (321), and the connecting protrusions (321) are provided with second mounting holes (322), and a first fastener passes through the second mounting hole (322) and the corresponding first mounting hole (313) and is connected. The adjustable cluster frame (300) further comprises a fixing member (330), the movable beam (320) is provided with a third mounting hole (323) arranged at intervals along the axial direction of the movable beam (320), and a second fixing member (330) passes through the fixing member (330) and is connected with the corresponding third mounting hole (323). 3.The energy storage system for power battery cascade utilization applied in low temperature environment according to claim 2, characterized in that, The side wall of the gradient power battery pack (200) is provided with a hanging lug (210), and a third fastener passes through the hanging lug (210) and is connected with the fixing member (330). The bottom of the main frame (310) is provided with at least one roller (340).

4. The energy storage system for power battery cascade utilization in low temperature environment according to claim 3, characterized in that, The two opposite side walls of the main frame (310) are provided with at least one guide wheel (350).

5. The energy storage system for power battery cascade utilization in low temperature environment according to claim 3, characterized in that, The two opposite side walls of the main frame (310) are provided with a plurality of guide wheels (350), and the sizes of the plurality of guide wheels (350) on the two sides gradually decrease along the extension direction of the side walls provided with the guide wheels (350).

6. The energy storage system for power battery cascade utilization in low temperature environment according to claim 5, characterized in that, The door seal assembly (130) comprises a D-shaped door seal strip (131), a magnetic door seal strip (132) and a heating resistance wire (133).

7. The energy storage system for step-graded utilization of power batteries in low-temperature environment according to any one of claims 1-6, characterized in that, ​ The type D door seal (131) is arranged at the outer edge of the cabin body (110), the heating resistance wire (133) is installed on the side wall of the cabin body (110), and the magnetic door seal (132) is installed on the surface of the door body (120) opposite to the cabin body (110).

8. The energy storage system for power battery cascade utilization in low temperature environment according to claim 7, characterized in that, The door seal assembly (130) further comprises a water guide (134) and a pressing member (136), one end of the water guide (134) is installed on the surface of the cabin body (110) opposite to the door body (120) and located outside the magnetic door seal (132), the other end is connected with the pressing member (136), and the water guide (134) is provided with a water guide groove (135).

9. The energy storage system for step-graded utilization of power batteries in low-temperature environment according to any one of claims 1-6, characterized in that, The energy storage system applied to the step utilization of the power battery in a low-temperature environment further comprises a liquid cooling system (410) installed in the cabin body (110) adjacent to the cabin body (110) where the step power battery pack (200) is installed, and the liquid cooling system (410) is used for heat exchange of the step power battery pack (200).

10. The energy storage system for step-graded utilization of power batteries in low-temperature environment according to any one of claims 1-6, characterized in that, The energy storage system applied to the step utilization of the power battery in a low-temperature environment further comprises a number of bidirectional converters (420) equal to the number of the step power battery packs (200). The bidirectional converter (420) is installed in the cabin body (110) adjacent to the cabin body (110) where the step power battery pack (200) is installed, and the bidirectional converter (420) is electrically connected with the step power battery pack (200) one by one.

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