Energy storage module liquid cooling system of off-grid power supply

Abstract

The invention discloses an energy storage module liquid cooling system of an off-grid power supply, which comprises a battery module box, a plurality of columnar battery cells are arranged in the battery module box, and each columnar battery cell is soaked in insulating cooling oil in a liquid cooling energy storage battery module box; a refrigerant leading-in pipe and a refrigerant leading-out pipe are respectively arranged on two sides of each battery module box in a communicating manner; and while the stroke resistance of the flow channel is reduced, the purposes of precise cooling and relieving of progressive decrease of the extended heat absorption efficiency are achieved.

Description

Technical Field

[0001] The invention belongs to the field of energy storage systems. Background Art

[0002] Compared with new energy vehicle power batteries, off-grid lithium energy storage batteries have lower requirements on volume-energy ratio and mass-energy ratio. Therefore, off-grid lithium energy storage batteries have greater design freedom in battery cooling and discharge strategies. The battery liquid cooling system is an efficient cooling solution. The traditional liquid cooling system is generally a long and narrow maze-like flow channel. The cooling oil has large stroke resistance during the flow process, the circulation pump load is relatively high, and the noise is relatively loud. At the same time, there is a problem on the cooling path that the heat absorption capacity of the cooling oil gradually decreases due to the gradual increase in temperature along the flow path, which in turn causes the problem of uneven heat absorption along the flow path. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a liquid cooling system for an energy storage module of an off-grid power supply, which reduces the flow path resistance while achieving the purpose of precise cooling and alleviating the decrease in extended heat absorption efficiency.

[0004] Technical Solution: To achieve the above-mentioned objectives, the present invention provides a liquid cooling system for an energy storage module of an off-grid power supply, comprising a battery module box, wherein a plurality of cylindrical battery cells are arranged in the battery module box, and each of the plurality of cylindrical battery cells is immersed in insulating cooling oil in the liquid-cooled energy storage battery module box; a refrigerant inlet pipe and a refrigerant outlet pipe are respectively provided on both sides of each battery module box;

[0005] From a top-down perspective, several battery group modules are arrayed along the X direction in the battery module box, and any two adjacent battery group modules are abutted against each other. The battery group modules together form a whole assembly in the front part of the battery module box, forming a zigzag refrigerant channel that extends in a zigzag shape along the X direction. The two ends of the zigzag refrigerant channel are respectively connected to the refrigerant inlet pipe and the refrigerant outlet pipe.

[0006] Furthermore, each battery group module is in the shape of a strip extending along the Y direction, and each battery group module has a curved channel unit formed at one end close to the front of the box; several curved channel units are connected end to end to form a tortuous refrigerant channel.

[0007] Furthermore, in the discharging and charging strategy of the battery module box, it is preferred that at least one of any two adjacent battery group modules is in a dormant state.

[0008] Furthermore, the columnar cells on the battery group module are classified according to different distribution positions, and are recorded as type A columnar cells, type B columnar cells, type C columnar cells, type D columnar cells, type E columnar cells and type F columnar cells.

[0009] Furthermore, a plurality of type B columnar cells, a plurality of type D columnar cells, and a plurality of type F columnar cells are respectively arranged in a close array along the Y direction, and a linear array formed by the plurality of type D columnar cells and a linear array formed by the plurality of type B columnar cells are parallel and symmetrical to both sides of the linear array formed by the plurality of type F columnar cells;

[0010] Several type C columnar cells are arranged closely together in an array in a semicircular path, and the Y+ ends of a linear array formed by several type D columnar cells and a linear array formed by several type B columnar cells are respectively close to the two ends of a semi-enclosed array formed by several type C columnar cells;

[0011] Several Class A columnar cells are distributed closely in an array in a semicircular path, and the Y-end of a linear array formed by several Class D columnar cells and the Y-end of a linear array formed by several Class B columnar cells respectively form a curved channel unit entrance and a curved channel unit exit with the two ends of a semi-enclosed array formed by several Class A columnar cells.

[0012] Furthermore, the Y+ end and Y- end of the linear array formed by the plurality of F-type columnar cells are respectively rotatably provided with a first pulley and a second pulley, the first pulley is rotatably provided with a first sponge rolling wheel on the side away from the plurality of F-type columnar cells, and the second pulley is rotatably provided with a second sponge rolling wheel on the side away from the plurality of F-type columnar cells; the two E-type columnar cells closely distributed along the Y direction are on the side of the first sponge rolling wheel away from the first pulley;

[0013] A first heat exchange channel extending along the Y direction is formed between the linear array formed by the plurality of D-type columnar battery cells and the linear array formed by the plurality of F-type columnar battery cells;

[0014] A curved second heat exchange channel is formed between the semi-enclosed array formed by the two E-type columnar battery cells and a plurality of C-type columnar battery cells;

[0015] A third heat exchange channel extending along the Y direction is formed between the linear array formed by the plurality of B-type columnar battery cells and the linear array formed by the plurality of F-type columnar battery cells;

[0016] The two ends of the curved second heat exchange channel are respectively connected to the Y+ end of the first heat exchange channel and the third heat exchange channel;

[0017] A curved cold medium channel is formed between the second sponge rolling wheel and the semi-enclosed array formed by the plurality of Class A cylindrical cells. The curved channel unit inlet, the curved cold medium channel, and the curved channel unit outlet together constitute a curved channel unit.

[0018] The Y-ends of the first heat exchange channel and the third heat exchange channel are connected to the inlet and outlet of the curved channel unit respectively.

[0019] Furthermore, at least one of the first pulley and the second pulley is a driving pulley that can be driven by the power device;

[0020] The invention also includes a pair of closed-loop conveyor belts extending in the Y direction, with a first arc spanning section and a second arc spanning section at each end of the closed-loop conveyor belt, the first arc spanning section and the second arc spanning section being stretched to span the pulley groove on the first pulley and the pulley groove on the second pulley respectively; the active rotation of the first pulley and the second pulley causes the closed-loop conveyor belt to perform linear motion along its own path;

[0021] A plurality of liquid-carrying sponges are fixedly attached to the outer side of the closed-loop conveyor belt along the path direction. The liquid-carrying sponges are thin at both ends and thick in the middle, and the thickest part of the liquid-carrying sponges does not exceed the width of the first heat exchange channel or the third heat exchange channel.

[0022] Each liquid-carrying sponge follows the closed-loop conveyor belt and moves linearly along its own path, so that the liquid-carrying sponge shuttles along the path of the first heat exchange channel or the third heat exchange channel.

[0023] Furthermore, a first rolling gap is formed between the first sponge rolling wheel and the first pulley; and a second rolling gap is formed between the second sponge rolling wheel and the second pulley.

[0024] Furthermore, a working method of a liquid cooling system for an energy storage module of an off-grid power supply is provided: when the lithium battery energy storage cabinet starts heat dissipation, an external circulating pump continuously introduces insulating cooling oil from the cold oil outlet of the circulating refrigeration device through the refrigerant inlet pipe into one side of the battery module box. Simultaneously, the insulating cooling oil on the other side of the battery module box is continuously discharged through the refrigerant outlet pipe and returned to the hot oil inlet of the circulating refrigeration device, thereby forming a cooling closed loop.

[0025] During the above cooling cycle, assuming that a certain group of battery modules in the battery module box is supplying power or charging externally, the first pulley or the second pulley in the group of battery modules is independently controlled to actively rotate clockwise.

[0026] Beneficial effect: During the cooling cycle of the present invention, the liquid-carrying sponge causes the tortuous refrigerant channel to branch out a continuous branch cooling cycle in the battery group module from the inlet of the curved channel unit → the first heat exchange channel → the curved second heat exchange channel → the third heat exchange channel → the outlet of the curved channel unit. The continuous branch cooling cycle accurately and continuously absorbs heat from each columnar battery cell in the battery group module along the circulation path, while no branch cycle can be formed in other dormant battery group modules due to the obstruction of the static sponge; thereby achieving the purpose of precise cooling.

[0027] At the same time, each liquid-carrying sponge will squeeze out fresh and relatively cold cooling oil from the left side of the first rolling gap when passing through the first rolling gap, so that the middle part of the branch cooling cycle of the curved channel unit inlet → first heat exchange channel 11 → curved second heat exchange channel → third heat exchange channel → curved channel unit outlet will be continuously replenished with relatively cold fresh cooling oil in the form of sponge extrusion, thereby alleviating the problem of gradually decreasing cooling efficiency along the branch cooling cycle of the insulating cooling oil continuously flowing through the curved channel unit inlet → first heat exchange channel → curved second heat exchange channel → third heat exchange channel → curved channel unit outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is the overall schematic diagram of the lithium battery energy storage cabinet;

[0029] Figure 2 A schematic diagram of the battery module box from a top-down view;

[0030] Figure 3 This is a schematic diagram of the internal cell layout of the battery module box;

[0031] Figure 4 This is a schematic diagram of a single battery group module from a top-down perspective;

[0032] Figure 5 This is a schematic diagram of the disassembly of a single battery group module;

[0033] Figure 6 for Figure 5 An enlarged schematic diagram of the mark 24;

[0034] Figure 7 for Figure 5 An enlarged schematic diagram of the mark 25;

[0035] Figure 8 for Figure 5 An enlarged schematic diagram of the mark 23;

[0036] Figure 9 for Figure 5 An enlarged schematic diagram of the mark 22. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] As attached Figures 1 to 9 An off-grid energy storage module liquid cooling system is shown, such as Figure 1As shown, the lithium battery energy storage cabinet 30 includes a plurality of liquid-cooled energy storage battery module boxes 19 stacked from top to bottom in the lithium battery energy storage cabinet 30; a plurality of cylindrical battery cells 1 are arranged in the liquid-cooled energy storage battery module box 19, and each of the plurality of cylindrical battery cells 1 is immersed in the insulating cooling oil in the liquid-cooled energy storage battery module box 19; in a general design, the plurality of cylindrical battery cells 1 are connected in parallel, series, or mixed according to the design requirements through the conductors in the battery module box 19. This solution focuses on the cooling structure and flow channel design of each cylindrical battery cell 1, and the conventional circuit part is not described in detail.

[0039] like Figure 1 and 3 As shown, a refrigerant inlet pipe 17 and a refrigerant outlet pipe 18 are respectively connected to both sides of the front portion 20 of each battery module box 19 near the front side of the lithium battery energy storage cabinet 30.

[0040] like Figure 3 As shown, from a top-down perspective, a plurality of battery group modules 21 are arrayed along the X direction in the battery module box 19, and each battery group module 21 is in the shape of a strip extending along the Y direction as a whole, and any two adjacent battery group modules 21 are abutted against each other; a plurality of battery group modules 21 together constitute an overall assembly in the front part 20 of the battery module box 19 to form a zigzag refrigerant channel 10 extending in a zigzag shape along the X direction as a whole, and the two ends of the zigzag refrigerant channel 10 are respectively connected to the refrigerant inlet pipe 17 and the refrigerant outlet pipe 18.

[0041] like Figure 3 and 4 Each battery group module 21 has a curved channel unit 10 a formed at one end close to the front portion 20 of the box body; a plurality of curved channel units 10 a are connected end to end to form a tortuous refrigerant channel 10 .

[0042] like Figure 4 The several columnar cells 1 on the battery group module 21 are classified according to different distribution positions, and are respectively recorded as type A columnar cell 1a, type B columnar cell 1b, type C columnar cell 1c, type D columnar cell 1d, type E columnar cell 1e and type F columnar cell 1f.

[0043] Several Class B columnar cells 1b, several Class D columnar cells 1d and several Class F columnar cells 1f are respectively distributed in close arrays along the Y direction. The linear array formed by the several Class D columnar cells 1d and the linear array formed by the several Class B columnar cells 1b are parallel and symmetrical to the two sides of the linear array formed by the several Class F columnar cells 1f.

[0044] Several C-type columnar cells 1c are arranged closely together in a semicircular array. The Y+ ends of a linear array formed by several D-type columnar cells 1d and a linear array formed by several B-type columnar cells 1b are respectively close to the two ends of a semi-enclosed array formed by several C-type columnar cells 1c.

[0045] Several type A columnar cells 1a are arranged closely together in an array in a semicircular path. The Y-end of the linear array formed by several type D columnar cells 1d and the Y-end of the linear array formed by several type B columnar cells 1b respectively form a curved channel unit entrance 7 and a curved channel unit exit 8 with the two ends of the semi-enclosed array formed by several type A columnar cells 1a.

[0046] The Y+ end and Y- end of the linear array formed by the plurality of F-type columnar battery cells 1f are respectively rotatably provided with a first pulley 4 and a second pulley 5. The first pulley 4 is rotatably provided with a first sponge rolling wheel 3 on the side away from the plurality of F-type columnar battery cells 1f, and the second pulley 5 is rotatably provided with a second sponge rolling wheel 6 on the side away from the plurality of F-type columnar battery cells 1f. The two E-type columnar battery cells 1e that are closely distributed along the Y direction are on the side of the first sponge rolling wheel 3 away from the first pulley 4;

[0047] A first heat exchange channel 11 extending along the Y direction is formed between a linear array formed by a plurality of D-type columnar battery cells 1d and a linear array formed by a plurality of F-type columnar battery cells 1f;

[0048] A curved second heat exchange channel 14 is formed between the semi-enclosed array formed by the two E-type columnar battery cells 1e and a plurality of C-type columnar battery cells 1c.

[0049] A third heat exchange channel 12 extending along the Y direction is formed between the linear array formed by the plurality of B-type columnar battery cells 1b and the linear array formed by the plurality of F-type columnar battery cells 1f.

[0050] The two ends of the curved second heat exchange channel 14 are connected to the Y+ end of the first heat exchange channel 11 and the third heat exchange channel 12 respectively;

[0051] A curved cold medium channel 9 is formed between the second sponge rolling wheel 6 and the semi-enclosed array formed by the plurality of Class A cylindrical cells 1a. The curved channel unit inlet 7, the curved cold medium channel 9 and the curved channel unit outlet 8 together constitute a curved channel unit 10a.

[0052] The Y-ends of the first heat exchange channel 11 and the third heat exchange channel 12 are connected to the curved channel unit inlet 7 and the curved channel unit outlet 8 respectively.

[0053] like Figures 5 to 9 As shown, at least one of the first pulley 4 and the second pulley 5 is a driving pulley that can be driven by the power device; the outer periphery of the first pulley 4 and the second pulley 5 is provided with at least two circles of sunken pulley grooves 16.

[0054] It also includes a pair of closed-loop conveyor belts 15 extending along the Y direction, with the first arc span section 15a and the second arc span section 15b at both ends respectively. The first arc span section 15a and the second arc span section 15b are in a taut state and respectively span the pulley groove 16 on the first pulley 4 and the pulley groove 16 on the second pulley 5; the active rotation of the first pulley 4 and the second pulley 5 causes the closed-loop conveyor belt 15 to move linearly along its own path; the closed-loop conveyor belt 15 is made of rubber or nylon fiber belt material.

[0055] Several liquid-carrying sponges 13 are fixedly attached to the outer side surface of the closed-loop conveyor belt 15 along the path direction. The liquid-carrying sponges 13 are thin at both ends and thick in the middle, and the thickest part of the liquid-carrying sponge 13 does not exceed the width of the first heat exchange channel 11 or the third heat exchange channel 12; each liquid-carrying sponge 13 follows the closed-loop conveyor belt 15 and moves linearly along its own path, so that the liquid-carrying sponge 13 shuttles along the path of the first heat exchange channel 11 or the third heat exchange channel 12.

[0056] like Figure 4 As shown, a first rolling gap 102 is formed between the first sponge rolling wheel 3 and the first pulley 4; a second rolling gap 101 is formed between the second sponge rolling wheel 6 and the second pulley 5; the liquid-carrying sponge 13 will be rolled in the process of passing through the first rolling gap 102 and the second rolling gap 101, and the liquid stored inside will be squeezed out.

[0057] Working principle:

[0058] When the lithium battery storage cabinet 30 is working, the cylindrical battery cells 1 inside that are working outward release heat to the surrounding area. In most cases, the power discharged by the lithium battery storage cabinet 30 is generally significantly less than the maximum output power of the lithium battery storage cabinet 30. Under normal power usage conditions, the power discharged by the lithium battery storage cabinet 30 is less than one-third of the maximum output power of the lithium battery storage cabinet 30. Therefore, it is not necessary for all the cylindrical battery cells 1 in the battery module box 19 to work together. Only a small number of the cylindrical battery cells 1 need to output power to the outside, and the remaining cylindrical battery cells 1 are in a dormant state.

[0059] In this solution, the battery group modules 21 in the battery module box 19 are independent of each other, and all the cylindrical cells 1 in each battery group module 21 are connected in series or in parallel as a whole to supply power or charge externally; that is, when a group of battery group modules 21 in the battery module box 19 is discharging or charging externally as a whole, the other battery group modules 21 can be in a dormant state or in a working state; in the discharge and charging strategy of the battery module box 19, it is preferred that at least one of any two adjacent battery group modules 21 is in a dormant state, so as to avoid the problem of heat accumulation.

[0060] Overall cooling oil circulation:

[0061] When the lithium battery energy storage cabinet 30 starts the heat dissipation work, the external circulation pump continuously introduces the insulating cooling oil from the cold oil outlet end of the circulating refrigeration device into one side of the battery module box 19 through the refrigerant inlet pipe 17. At the same time, the insulating cooling oil on the other side of the battery module box 19 is continuously discharged through the refrigerant outlet pipe 18 and returned to the hot oil inlet end of the circulating refrigeration device, thereby forming a cooling closed loop.

[0062] During the above-mentioned cooling cycle, inside the battery module box 19, the tortuous refrigerant channel 10 formed by a plurality of tortuous channel units 10a connected end to end is the shortest and smoothest passage connecting the refrigerant inlet pipe 17 and the refrigerant outlet pipe 18 without sponge obstruction; therefore, the insulating cooling oil introduced from the refrigerant inlet pipe 17 will flow relatively smoothly through the tortuous refrigerant channel 10 directly to the refrigerant outlet pipe 18.

[0063] Since the tortuous refrigerant channel 10 is the relatively shortest path in the battery module box 19, the insulating coolant introduced from the refrigerant inlet pipe 17 flows directly to the refrigerant outlet pipe 18 through the tortuous refrigerant channel 10 without having to flow through the long and narrow maze-like flow channel of the traditional liquid cooling system in sequence, thereby effectively reducing the stroke resistance of the liquid cooling cycle and the load and noise of the circulating pump, and effectively ensuring the flow rate during the cooling cycle, and allowing each curved channel unit 10a to flow through the relatively cold insulating cooling oil at a sufficient flow rate.

[0064] During the above cooling cycle, assuming that a certain battery group module 21 in the battery module box 19 is supplying power or charging, the first pulley 4 or the second pulley 5 in the battery group module 21 is independently controlled to rotate clockwise, thereby driving the closed-loop conveyor belt 15 in the battery group module 21 to move along its own clockwise path, and each liquid-carrying sponge 13 follows the closed-loop conveyor belt 15 to move along its own path in a clockwise circular motion, as shown in FIG. Figure 4As shown, the liquid-carrying sponge 13 located in the left half of the closed-loop conveyor belt 15 will shuttle in the Y+ direction in the first heat exchange channel 11, and the liquid-carrying sponge 13 will push the insulating cooling oil in the first heat exchange channel 11 to flow in the Y+ direction. The liquid-carrying sponge 13 located in the right half of the closed-loop conveyor belt 15 will shuttle in the Y- direction in the third heat exchange channel 12, and the liquid-carrying sponge 13 will push the insulating cooling oil in the third heat exchange channel 12 to flow in the Y- direction; thereby continuously forming a liquid flow in the Y+ direction in the first heat exchange channel 11 and a liquid flow in the Y- direction in the third heat exchange channel 12. liquid flow; thereby causing the tortuous refrigerant channel 10 to branch out a continuous branch cooling cycle in the battery group module 21 from the curved channel unit inlet 7 → the first heat exchange channel 11 → the curved second heat exchange channel 14 → the third heat exchange channel 12 → the curved channel unit outlet 8. The continuous branch cooling cycle accurately absorbs heat continuously for each columnar battery cell 1 in the battery group module 21 along the circulation path, while no branch cycle can be formed in other dormant battery group modules 21 due to the obstruction of the static sponge; thereby achieving the purpose of precise cooling.

[0065] During the branch cooling cycle of the above-mentioned insulating cooling oil continuously flowing through the curved channel unit inlet 7 → first heat exchange channel 11 → curved second heat exchange channel 14 → third heat exchange channel 12 → curved channel unit outlet 8, there is a problem of gradually decreasing cooling efficiency along the process, which in turn causes the problem of uneven heat absorption.

[0066] However, in this scheme, if Figure 4 As shown, in any closed-loop cycle in which each liquid-carrying sponge 13 follows the closed-loop conveyor belt 15 to perform clockwise circular motion along its own path, any liquid-carrying sponge 13 will roll through the second rolling gap 101 and the first rolling gap 102 once.

[0067] like Figure 4 As shown, in the process of the liquid-carrying sponge 13 passing through the second rolling gap 101 from right to left, the cooling oil originally existing in the liquid-carrying sponge 13 is gradually squeezed out on the right side of the second rolling gap 101, and the fresh and slightly cold cooling oil at the entrance 7 of the curved channel unit is sucked into the gradually restored and enlarged liquid-carrying sponge 13 on the left side of the second rolling gap 101, so that the fresh and slightly cold cooling oil is stored in the liquid-carrying sponge 13. As the fresh and slightly cold cooling oil sucked into the liquid-carrying sponge 13 loses its fluidity, and the liquid-carrying sponge 13 itself The liquid-carrying sponge 13 has a certain heat preservation ability, so the temperature of the fresh and relatively cold cooling oil stored in the liquid-carrying sponge 13 coming out of the second rolling gap 101 can be kept warm to a certain extent for a certain period of time. As the liquid-carrying sponge 13 continues to move along the closed-loop conveyor belt 15, the liquid-carrying sponge 13 passes through the first rolling gap 102 from right to left. The fresh and relatively cold cooling oil originally stored in the liquid-carrying sponge 13 is squeezed out from the left side of the first rolling gap 102 during the process of passing through the first rolling gap 102.

[0068] Based on the above rules, each liquid-carrying sponge 13 will squeeze out fresh and relatively cold cooling oil from the left side of the first rolling gap 102 when passing through the first rolling gap 102, so that the middle part of the branch cooling cycle of the curved channel unit inlet 7 → first heat exchange channel 11 → curved second heat exchange channel 14 → third heat exchange channel 12 → curved channel unit outlet 8 will be continuously replenished with relatively cold fresh cooling oil in the form of sponge extrusion, thereby alleviating the problem of gradually decreasing cooling efficiency along the branch cooling cycle of the insulating cooling oil continuously flowing through the curved channel unit inlet 7 → first heat exchange channel 11 → curved second heat exchange channel 14 → third heat exchange channel 12 → curved channel unit outlet 8.

[0069] In addition, the liquid-carrying sponge 13 of this embodiment also plays a role in absorbing solid impurities in the cooling oil.

[0070] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A liquid cooling system for an energy storage module of an off-grid power supply, characterized in that: The invention comprises a battery module box (19), wherein a plurality of columnar battery cells (1) are arranged in the battery module box (19), and each of the plurality of columnar battery cells (1) is immersed in insulating cooling oil in the liquid-cooled energy storage battery module box (19); a refrigerant inlet pipe (17) and a refrigerant outlet pipe (18) are respectively connected on both sides of each battery module box (19); in a top view, a plurality of battery group modules (21) are arrayed along the X direction in the battery module box (19), and any two adjacent battery group modules (21) are abutted against each other; a whole composed of the plurality of battery group modules (21) is assembled in the front part (20) of the battery module box (19) to form a zigzag refrigerant channel (10) extending in a zigzag shape along the X direction, and the two ends of the zigzag refrigerant channel (10) are respectively connected to the refrigerant inlet pipe (17) and the refrigerant outlet pipe (18).

2. The energy storage module liquid cooling system for an off-grid power supply according to claim 1, characterized in that: Each battery group module (21) is in the shape of a strip extending in the Y direction as a whole, and each battery group module (21) forms a curved channel unit (10a) at one end close to the front portion (20) of the box body; a plurality of curved channel units (10a) are connected end to end to form the tortuous refrigerant channel (10).

3. The energy storage module liquid cooling system for an off-grid power supply according to claim 2, characterized in that: In the discharging and charging strategy of the battery module box (19), priority is given to allowing at least one of any two adjacent battery group modules (21) to be in a dormant state.

4. The energy storage module liquid cooling system for an off-grid power supply according to claim 2, characterized in that: The plurality of columnar cells (1) on the battery group module (21) are classified according to different distribution positions and are respectively recorded as type A columnar cell (1a), type B columnar cell (1b), type C columnar cell (1c), type D columnar cell (1d), type E columnar cell (1e) and type F columnar cell (1f).

5. The energy storage module liquid cooling system for an off-grid power supply according to claim 4, characterized in that: A plurality of type B columnar cells (1b), a plurality of type D columnar cells (1d), and a plurality of type F columnar cells (1f) are respectively distributed in a close array along the Y direction, and a linear array formed by the plurality of type D columnar cells (1d) and a linear array formed by the plurality of type B columnar cells (1b) are parallel and symmetrical to both sides of a linear array formed by the plurality of type F columnar cells (1f); A plurality of C-type columnar cells (1c) are closely arranged in an array in a semicircular path, and the Y+ ends of a linear array formed by a plurality of D-type columnar cells (1d) and a linear array formed by a plurality of B-type columnar cells (1b) are respectively closely arranged at both ends of a semi-enclosed array formed by a plurality of C-type columnar cells (1c); a plurality of A-type columnar cells (1a) are closely arranged in an array in a semicircular path, and the Y- ends of a linear array formed by a plurality of D-type columnar cells (1d) and a Y- end of a linear array formed by a plurality of B-type columnar cells (1b) respectively form a curved channel unit entrance (7) and a curved channel unit exit (8) with both ends of the semi-enclosed array formed by a plurality of A-type columnar cells (1a).

6. The energy storage module liquid cooling system for an off-grid power supply according to claim 5, characterized in that: The Y+ end and Y- end of the linear array formed by a plurality of F-type columnar battery cells (1f) are respectively provided with a first pulley (4) and a second pulley (5) for rotation; the first pulley (4) is provided with a first sponge rolling wheel (3) for rotation on a side away from the plurality of F-type columnar battery cells (1f); the second pulley (5) is provided with a second sponge rolling wheel (6) for rotation on a side away from the plurality of F-type columnar battery cells (1f); the two E-type columnar battery cells (1e) closely distributed along the Y direction are provided on a side of the first sponge rolling wheel (3) away from the first pulley (4); A first heat exchange channel (11) extending in the Y direction is formed between a linear array formed by a number of D-type columnar battery cells (1d) and a linear array formed by a number of F-type columnar battery cells (1f); a curved second heat exchange channel (14) is formed between a semi-enclosed array formed by two E-type columnar battery cells (1e) and a number of C-type columnar battery cells (1c); a third heat exchange channel (12) extending in the Y direction is formed between a linear array formed by a number of B-type columnar battery cells (1b) and a linear array formed by a number of F-type columnar battery cells (1f); and two ends of the curved second heat exchange channel (14) are respectively connected to the Y+ ends of the first heat exchange channel (11) and the third heat exchange channel (12); A curved cold medium channel (9) is formed between the second sponge rolling wheel (6) and the semi-enclosed array formed by a plurality of Class A columnar battery cells (1a); the curved channel unit inlet (7), the curved cold medium channel (9) and the curved channel unit outlet (8) together constitute a curved channel unit (10a); and the Y-ends of the first heat exchange channel (11) and the third heat exchange channel (12) are connected to the curved channel unit inlet (7) and the curved channel unit outlet (8), respectively.

7. The energy storage module liquid cooling system for an off-grid power supply according to claim 6, characterized in that: The invention also includes a pair of closed-loop conveyor belts (15) extending along the Y direction, wherein the two ends of the closed-loop conveyor belt (15) are respectively a first arc span section (15a) and a second arc span section (15b), and the first arc span section (15a) and the second arc span section (15b) are tautly stretched and respectively span the pulley groove (16) on the first pulley (4) and the pulley groove (16) on the second pulley (5); the active rotation of the first pulley (4) and the second pulley (5) causes the closed-loop conveyor belt (15) to move linearly along its own path; a plurality of liquid-carrying sponges (13) are fixedly attached to the outer side surface of the closed-loop conveyor belt (15) along the path direction; and each liquid-carrying sponge (13) moves following the closed-loop conveyor belt (15).

8. The energy storage module liquid cooling system for an off-grid power supply according to claim 7, characterized in that: A first rolling gap (102) is formed between the first sponge rolling wheel (3) and the first pulley (4); and a second rolling gap (101) is formed between the second sponge rolling wheel (6) and the second pulley (5).

9. The operating method of the liquid cooling system for an energy storage module of an off-grid power supply according to claim 8, characterized in that: When the lithium battery energy storage cabinet (30) starts the heat dissipation operation, the external circulation pump continuously guides the insulating cooling oil from the cold oil outlet end of the circulating refrigeration device through the refrigerant inlet pipe (17) into one side of the battery module box (19). At the same time, the insulating cooling oil on the other side of the battery module box (19) is continuously guided out through the refrigerant outlet pipe (18) and returned to the hot oil inlet end of the circulating refrigeration device, thereby forming a cooling closed loop. During the cooling cycle, assuming that a certain battery group module (21) in the battery module box (19) is supplying power or charging externally, the first pulley (4) or the second pulley (5) in the battery group module (21) is independently controlled to actively rotate clockwise.

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