Low-voltage power distribution network power load balancing equipment and method

Abstract

The invention relates to the technical field of power equipment, and discloses a low-voltage distribution network power load balancing device and method, and the device comprises an energy storage battery box, the top of the energy storage battery box is fixedly provided with an upper sealing cover, and the bottom of the energy storage battery box is fixedly provided with a lower sealing cover. An upper press-fitting assembly is arranged on the upper portion in the energy storage battery box, a lower press-fitting assembly is arranged on the lower portion in the energy storage battery box, a plurality of isolation suites located between the upper press-fitting assembly and the lower press-fitting assembly are arranged in the energy storage battery box, a plurality of battery cells are inserted into the isolation suites, and wiring terminals are arranged at the two ends of each battery cell. According to the power load balancing equipment and method for the low-voltage power distribution network, the battery core array can be mounted in the energy storage battery box through the plurality of isolation suites, meanwhile, a cooling flow channel for cooling the battery cores is formed in the energy storage battery box through the plurality of isolation suites, and cooling liquid can flow along the cooling flow channel, so that the heat dissipation effect and uniformity of the battery cores are ensured, and the service life of the battery cores is prolonged. And the heat dissipation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power equipment, and in particular to a low-voltage distribution network electric power load balancing device and method. Background Art

[0002] The low-voltage distribution network power load balancing equipment is used to optimize power distribution and improve power grid efficiency and stability. It mainly includes automatic voltage regulator: automatically adjusts voltage to ensure stable output voltage; reactive power compensation device: compensates reactive power through capacitors or reactors to improve power factor; load balancing controller: real-time monitoring and adjustment of each phase load to ensure three-phase load balance; intelligent distribution unit: integrates monitoring, control and communication functions to achieve intelligent management of load; power electronic transformer: realizes voltage conversion and load balancing through power electronic technology; energy storage system: stores energy when the load is low and discharges it at peak to balance the load.

[0003] Battery energy storage technology is an energy storage technology with good application prospects and rapid development, and it occupies a mainstream position in the electrochemical energy storage market. Energy storage batteries generate a lot of heat during the charging and discharging process. In order to ensure the normal use of the battery, it is necessary to dissipate heat and cool it. At present, battery energy storage systems generally use two methods: air cooling or indirect cooling by liquid cooling plates. When air cooling is used, the heat transfer capacity is poor and the heat dissipation efficiency is low due to the low thermal conductivity of air. The indirect liquid cooling plate heat dissipation can only cool the battery module on one side, and cannot quickly take away the heat emitted by the battery as a whole. There is still a problem of slow cooling efficiency. In addition, common liquid cooling plates generally transport coolant through copper tubes. After long-term use, the copper tubes are easily corroded and penetrated, and there is a probability of coolant leakage. Summary of the invention

[0004] The object of the present invention is to provide a low-voltage distribution network power load balancing device and method to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-voltage power distribution network power load balancing device, comprising an energy storage battery box, an upper sealing cover is fixedly installed on the top of the energy storage battery box, and a lower sealing cover is fixedly installed on the bottom, an upper press-fit assembly is arranged above the inside of the energy storage battery box, and a lower press-fit assembly is arranged below the inside of the energy storage battery box, and a plurality of isolation kits located between the upper press-fit assembly and the lower press-fit assembly are arranged inside the energy storage battery box, and a plurality of battery cells are plugged into the plurality of isolation kits, and both ends of the battery cells are provided with connection terminals, the connection terminals at the top of the battery cells pass through the upper press-fit assembly and are welded with an upper connecting copper bar, and the connection terminals at the bottom of the battery cells pass through the lower press-fit assembly and are welded with a lower connecting copper bar, and an upper output terminal matched with the upper connecting copper bar and a lower output terminal matched with the lower connecting copper bar are arranged at either end of the short side of the energy storage battery box;

[0006] A cooling channel is formed between adjacent isolation kits, and an anti-corrosion component is clamped in the cooling channel. The anti-corrosion component includes a connecting plate, a supporting column and an active corrosion column. The connecting plate is made of the same material as the isolation kit. The metal activity of the active corrosion column is higher than that of the isolation kit. One side of the long side of the energy storage battery box is fixedly connected to a water inlet manifold, and the other side is fixedly connected to a water return manifold. Both the water inlet manifold and the return manifold are connected to the cooling channel, and a plurality of throttle valves are arranged on the water inlet manifold.

[0007] Preferably, the upper press-fit assembly has the same structure as the lower press-fit assembly and is arranged in a mirror image in the energy storage battery box. The upper press-fit assembly includes a press-fit plate, a press-fit cavity, a sealing ring and a side sealing sleeve. The press-fit plate is fixedly installed inside the energy storage battery box by screws. During the process of installing the press-fit plate by screws, the sealing ring on the press-fit plate can be pressed tightly against the end of the battery cell.

[0008] Preferably, a press-fitting cavity cooperating with the battery core is provided on one side of the press-fitting plate close to the battery core, and a sealing ring is glued in the press-fitting cavity. The sealing ring is provided to achieve sealing of the contact position between the press-fitting plate and the battery core to prevent leakage of coolant.

[0009] Preferably, a side sealing sleeve is glued to the periphery of the press-fitting cavity, and the cross-section of the side sealing sleeve is trapezoidal. After the press-fitting plate is installed, the side sealing sleeve squeezes the inner wall of the energy storage battery box to achieve sealing at the connection position between the press-fitting plate and the energy storage battery box.

[0010] Preferably, the inner walls of the two long sides of the energy storage battery box are provided with a plurality of snap-in seats cooperating with the isolation kit, and the inside of the snap-in seats is glued with sealing strips, and the isolation kit is provided with a plurality of plug-in seats cooperating with the battery core, and the ends of the plug-in seats are glued with sealing rings, and the upper press-fit assembly and the lower press-fit assembly can be pressed against the two ends of the isolation kit after installation, and the sealing rings are provided to improve the sealing of the contact positions between the isolation kit and the upper press-fit assembly and the lower press-fit assembly.

[0011] Preferably, an upper output copper bar is embedded in one end of the energy storage battery box close to the upper output terminal, and one end of the upper output copper bar is fixedly connected to the upper output terminal, and the other end is fixedly connected to the upper connecting copper bar. A lower output copper bar is embedded in one end of the energy storage battery box close to the lower output terminal, and one end of the lower output copper bar is fixedly connected to the lower output terminal, and the other end is fixedly connected to the lower connecting copper bar. The lower output terminal is electrically connected to the bottom end of the battery core through the lower connecting copper bar and the lower output copper bar, and the upper output terminal is electrically connected to the top end of the battery core through the upper output copper bar and the upper connecting copper bar.

[0012] Preferably, the connecting plate is clamped between adjacent isolation kits, and the connecting plate is horizontally arranged as a whole inside the energy storage battery box. Support columns are vertically arranged at both ends of the connecting plate, and the support columns are clamped between the upper press-fit assembly and the lower press-fit assembly, so as to limit the position of the connecting plate.

[0013] Preferably, the connecting plate and the isolation kit are both made of copper, the active corrosion column is nested in the middle of the connecting plate, and the material of the active corrosion column is zinc. The cathodic protection method is used to sacrifice the active corrosion column to prevent the isolation kit from being corroded and damaged by the coolant.

[0014] A method for using a low-voltage distribution network power load balancing device comprises the following steps:

[0015] S1. Connect the device to the power system through the upper output terminal and the lower output terminal, and store energy when the load is low and discharge energy when the load is high through the power system control to balance the load;

[0016] S2. Connect the water inlet manifold and the water return manifold to the coolant supply device in the prior art. The coolant enters along the water inlet manifold, and the flow rate of the coolant at different positions is limited by the throttle valve, so that the flow rate of the coolant in the cooling channel at different positions tends to be consistent. The coolant flows in the cooling channel, and the heat of the battery core during operation is dissipated outward through the isolation kit. The coolant absorbs the heat dissipated by the battery core while flowing, and the battery core is quickly cooled down. The coolant flows out along the water return manifold and flows back to the coolant supply device in the prior art, and the heated coolant is cooled down, and the coolant is driven to circulate in the cooling channel to continuously cool down the battery core.

[0017] S3. After the upper press-fit assembly and the lower press-fit assembly are installed in the energy storage battery box, the upper press-fit assembly and the lower press-fit assembly are sealed with the energy storage battery box through the side sealing sleeve, the upper press-fit assembly and the lower press-fit assembly are sealed with the battery core end through the sealing ring, and the upper press-fit assembly and the lower press-fit assembly are sealed with the isolation kit through the sealing ring to prevent coolant leakage;

[0018] S4. The connecting plate is positioned and installed in the cooling channel between adjacent isolation kits through the support columns at both ends. The connecting plate is in contact with the isolation kits on both sides. The connecting plate and the isolation kits are both made of copper, and the active corrosion column is made of zinc. The cathodic protection method is used to prevent the isolation kit from being corroded and damaged by the coolant by sacrificing the active corrosion column.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The low-voltage distribution network power load balancing device and method can install the battery cell array in the energy storage battery box through a plurality of isolation kits, and at the same time form a cooling channel for cooling the battery core in the energy storage battery box through a plurality of isolation kits. The coolant can flow along the cooling channel to ensure the effect and uniformity of heat dissipation of the battery core, improve the heat dissipation efficiency, and fully immerse the battery in the coolant to achieve protection of the battery core, with better fire protection performance and higher safety. The cooling channel is arranged between the two long sides of the energy storage battery box, shortening the travel of the cooling channel and effectively improving the cooling efficiency.

[0021] 2. The low-voltage distribution network power load balancing device and method, by arranging a sealing ring and a side sealing sleeve on the press-fit plate, and arranging a sealing ring on the end of the isolation kit, ensures the sealing of the press-fit plate and the isolation kit, the battery cell and the energy storage battery box after installation, prevents coolant leakage, and further improves safety.

[0022] 3. The low-voltage distribution network power load balancing device and method can assist in strengthening the stability of the isolation kit after installation by setting an anti-corrosion component between adjacent isolation kits. At the same time, the active corrosion column is made of zinc, and the connecting plate and the isolation kit are made of copper. The cathodic protection method is used to sacrifice the active corrosion column to prevent the isolation kit from being corroded and damaged by the coolant, thereby ensuring that the isolation kit can stably transfer the heat dissipated by the battery core to the coolant, while avoiding direct contact between the coolant and the battery core, thereby reducing the probability of the battery core being corroded and damaged by the coolant. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure after the overall combination of the present invention;

[0024] Figure 2 It is a schematic structural diagram of a front cross-section of the present invention;

[0025] Figure 3 This is a schematic diagram of the structure of the upper connecting copper bar connected to the battery core in the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the battery core installed inside the energy storage battery box in the present invention;

[0027] Figure 5 It is a structural schematic diagram of the upper press-fit assembly in the present invention;

[0028] Figure 6 It is a structural schematic diagram of a partial cross section of a press-fit plate in the present invention;

[0029] Figure 7 It is a structural schematic diagram of the isolation kit in the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the anti-corrosion component in the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure inside the energy storage battery box of the present invention.

[0032] In the figure: 1. Energy storage battery box; 2. Upper sealing cover; 3. Lower sealing cover; 4. Upper press-fit assembly; 41. Press-fit plate; 42. Press-fit cavity; 43. Sealing ring; 44. Side sealing sleeve; 5. Upper connecting copper bar; 6. Upper output copper bar; 7. Upper output terminal; 8. Lower press-fit assembly; 9. Lower connecting copper bar; 10. Lower output copper bar; 11. Lower output terminal; 12. Isolation kit; 13. Battery core; 14. Anti-corrosion assembly; 141. Connecting plate; 142. Support column; 143. Active corrosion column; 15. Sealing ring; 16. Snap-fit ​​seat; 17. Sealing strip; 18. Inlet manifold; 19. Throttle valve; 20. Return manifold. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 9 In an embodiment of the present invention, a low-voltage distribution network power load balancing device includes an energy storage battery box 1, an upper sealing cover 2 is fixedly installed on the top of the energy storage battery box 1, a lower sealing cover 3 is fixedly installed on the bottom, an upper press-fit assembly 4 is arranged above the inside of the energy storage battery box 1, and a lower press-fit assembly 8 is arranged below the bottom, and a plurality of isolation kits 12 are arranged between the upper press-fit assembly 4 and the lower press-fit assembly 8 inside the energy storage battery box 1, and a plurality of battery cells 13 are plugged into the plurality of isolation kits 12, and both ends of the battery cells 13 are provided with wiring terminals, and the coolant can flow along the isolation kits 12. The cooling fluid flows in the cooling channel between the sets 12, ensuring the effect and uniformity of heat dissipation of the battery core 13, improving the heat dissipation efficiency, and being able to completely immerse the battery in the coolant, thereby protecting the battery core 13 and achieving better fire protection performance. The connection terminal at the top of the battery core 13 passes through the upper press-fit assembly 4 and is welded with an upper connecting copper bar 5, and the connection terminal at the bottom of the battery core 13 passes through the lower press-fit assembly 8 and is welded with a lower connecting copper bar 9. An upper output terminal 7 matched with the upper connecting copper bar 5 and a lower output terminal 11 matched with the lower connecting copper bar 9 are provided at either end of the short side of the energy storage battery box 1;

[0035] A cooling channel is formed between adjacent isolation kits 12, and an anti-corrosion component 14 is clamped in the cooling channel. The anti-corrosion component 14 includes a connecting plate 141, a supporting column 142, and an active corrosion column 143. The connecting plate 141 is made of the same material as the isolation kit 12. The metal activity of the active corrosion column 143 is higher than that of the isolation kit 12. The anti-corrosion component 14 is arranged between adjacent isolation kits 12 to assist in strengthening the stability of the isolation kit 12 after installation. The cathode protection method is used to prevent the isolation kit 12 from being corroded by the coolant by sacrificing the active corrosion column 143. The insulation kit 12 can stably transfer the heat dissipated by the battery core 13 to the coolant, while avoiding direct contact between the coolant and the battery core 13, thereby reducing the probability of the battery core 13 being damaged by the coolant. A water inlet manifold 18 is fixedly connected to one side of the long side of the energy storage battery box 1, and a water return manifold 20 is fixedly connected to the other side. Both the water inlet manifold 18 and the water return manifold 20 are connected to the cooling channel. A plurality of throttle valves 19 are arranged on the water inlet manifold 18. The throttle valves 19 limit the flow rate of the coolant at various locations, so that the flow rate of the coolant in the cooling channels at different positions tends to be consistent.

[0036] As a further implementation scheme of the above invention: the upper press-fitting assembly 4 and the lower press-fitting assembly 8 have the same structure and are arranged in a mirror image in the energy storage battery box 1. The upper press-fitting assembly 4 and the lower press-fitting assembly 8 cooperate with each other to achieve the positioning of the isolation kit 12 and the battery cell 13 in the energy storage battery box 1. The upper press-fitting assembly 4 includes a press-fitting plate 41, a press-fitting cavity 42, a sealing ring 43 and a side sealing sleeve 44. The press-fitting plate 41 is fixedly installed inside the energy storage battery box 1 by screws to ensure that the upper press-fitting assembly 4 and the lower press-fitting assembly 8 are firmly installed in the energy storage battery box 1. At the same time, in the process of installing the press-fitting plate 41 by screws, the sealing ring 43 on the press-fitting plate 41 can be pressed against the end of the battery cell 13 to ensure the sealing of the connection position between the press-fitting plate 41 and the battery cell 13.

[0037] As a further implementation scheme of the above invention: a press-fitting cavity 42 cooperating with the press-fitting plate 41 is provided on one side close to the battery cell 13. The press-fitting cavity 42 can limit the end of the battery cell 13 and ensure the stability of the battery cell 13 after installation inside the energy storage battery box 1, and a sealing ring 43 is glued in the press-fitting cavity 42. The sealing ring 43 is provided to achieve the sealing of the contact position between the press-fitting plate 41 and the battery cell 13 to prevent leakage of the coolant.

[0038] As a further implementation scheme of the above invention: a side sealing sleeve 44 is glued to the surrounding side of the press-fitting cavity 42, and the cross-section of the side sealing sleeve 44 is a trapezoid. The cross-section of the side sealing sleeve 44 is set to be a trapezoid, which facilitates the installation of the press-fitting plate 41 in the energy storage battery box 1 along the small-sized end of the side sealing sleeve 44. At the same time, after the press-fitting plate 41 is installed, the inner wall of the energy storage battery box 1 is squeezed by the side sealing sleeve 44 to achieve the sealing of the connection position between the press-fitting plate 41 and the energy storage battery box 1.

[0039] As a further implementation scheme of the above invention: the inner walls of the two long sides of the energy storage battery box 1 are provided with a plurality of snap-in seats 16 that cooperate with the isolation kit 12. The snap-in seats 16 can limit the position of the isolation kit 12 to ensure the stability of the isolation kit 12 after installation inside the energy storage battery box 1, and realize the formation of a stable cooling flow channel inside the energy storage battery box 1, and the inside of the snap-in seat 16 is glued with a sealing strip 17 to improve the sealing of the contact position between the snap-in seat 16 and the isolation kit 12. The isolation kit 12 is provided with a plurality of sockets that cooperate with the battery core 13, and the ends of the sockets are glued with sealing rings 15. After installation, the upper press-fit assembly 4 and the lower press-fit assembly 8 can be pressed against the two ends of the isolation kit 12. By setting the sealing ring 15, the sealing of the contact position between the isolation kit 12 and the upper press-fit assembly 4 and the lower press-fit assembly 8 is improved to prevent the coolant from affecting the battery core 13.

[0040] As a further implementation scheme of the above invention: an upper output copper bar 6 is embedded in one end of the energy storage battery box 1 close to the upper output terminal 7, and one end of the upper output copper bar 6 is fixedly connected to the upper output terminal 7, and the other end is fixedly connected to the upper connecting copper bar 5. The upper output copper bar 6 and the lower output copper bar 10 are both embedded in the energy storage battery box 1 to ensure the conductive effect while avoiding contact with the coolant and avoiding interference with the installation of the press-fit plate 41. A lower output copper bar 10 is embedded in one end of the energy storage battery box 1 close to the lower output terminal 11, and one end of the lower output copper bar 10 is fixedly connected to the lower output terminal 11, and the other end is fixedly connected to the lower connecting copper bar 9. The lower output terminal 11 is electrically connected to the bottom end of the battery core 13 through the lower connecting copper bar 9 and the lower output copper bar 10, and the upper output terminal 7 is electrically connected to the top end of the battery core 13 through the upper output copper bar 6 and the upper connecting copper bar 5.

[0041] As a further implementation scheme of the above invention: the connecting plate 141 is clamped between adjacent isolation kits 12, and the connecting plate 141 is horizontally arranged as a whole inside the energy storage battery box 1, and the connection between the active corrosion column 143 and the isolation kit 12 is achieved through conduction through the connecting plate 141, while avoiding the connection plate 141 from affecting the flow of coolant. Support columns 142 are vertically arranged on both ends of the connecting plate 141, and the support columns 142 are clamped between the upper press-fit assembly 4 and the lower press-fit assembly 8, so as to limit the position of the connecting plate 141.

[0042] As a further implementation scheme of the above invention: the connecting plate 141 and the isolation kit 12 are both made of copper, the active corrosion column 143 is nested in the middle of the connecting plate 141, and the material of the active corrosion column 143 is zinc. The cathodic protection method is used to sacrifice the active corrosion column 143 to prevent the isolation kit 12 from being corroded and damaged by the coolant, thereby ensuring that the isolation kit 12 can stably transfer the heat dissipated by the battery core 13 to the coolant, while avoiding direct contact between the coolant and the battery core 13.

[0043] A method for using a low-voltage distribution network power load balancing device comprises the following steps:

[0044] S1, connect the device to the power system through the upper output terminal 7 and the lower output terminal 11, and control the power system to store energy when the load is low and discharge energy when the load is high, so as to balance the load;

[0045] S2. Connect the water inlet manifold 18 and the water return manifold 20 to the coolant supply device in the prior art. The coolant enters along the water inlet manifold 18, and the flow rate of the coolant at different positions is limited by the throttle valve 19, so that the flow rate of the coolant in the cooling channel at different positions tends to be consistent. The coolant flows in the cooling channel, and the heat of the battery core 13 during operation is dissipated outward through the isolation kit 12. The coolant absorbs the heat dissipated by the battery core 13 while flowing, and the battery core 13 is quickly cooled down. The coolant flows out along the water return manifold 20 and flows back to the coolant supply device in the prior art, and the heated coolant is cooled down, and the coolant is driven to circulate in the cooling channel, and the battery core 13 is continuously cooled down.

[0046] S3, after the upper press-fit assembly 4 and the lower press-fit assembly 8 are installed in the energy storage battery box 1, the upper press-fit assembly 4 and the lower press-fit assembly 8 are sealed with the energy storage battery box 1 through the side sealing sleeve 44, the upper press-fit assembly 4 and the lower press-fit assembly 8 are sealed with the end of the battery core 13 through the sealing ring 43, and the upper press-fit assembly 4 and the lower press-fit assembly 8 are sealed with the isolation kit 12 through the sealing ring 15 to prevent coolant leakage;

[0047] S4. The connecting plate 141 is positioned and installed in the cooling channel between adjacent isolation kits 12 through the support columns 142 at both ends. The connecting plate 141 is in contact with the isolation kits 12 on both sides, and the connecting plate 141 and the isolation kits 12 are both made of copper. The active corrosion column 143 is made of zinc. The cathodic protection method is used to prevent the isolation kit 12 from being corroded and damaged by the coolant by sacrificing the active corrosion column 143.

[0048] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A low-voltage power distribution network power load balancing device, comprising an energy storage battery box (1), wherein an upper sealing cover (2) is fixedly installed on the top of the energy storage battery box (1), and a lower sealing cover (3) is fixedly installed on the bottom, characterized in that: An upper press-fit assembly (4) is arranged above the interior of the energy storage battery box (1), and a lower press-fit assembly (8) is arranged below the interior of the energy storage battery box (1). A plurality of isolation kits (12) are arranged between the upper press-fit assembly (4) and the lower press-fit assembly (8), and a plurality of battery cells (13) are plugged into the isolation kits (12). Both ends of the battery cells (13) are provided with connection terminals. The connection terminals at the top of the battery cells (13) pass through the upper press-fit assembly (4) and are welded with an upper connecting copper bar (5). The connection terminals at the bottom of the battery cells (13) pass through the lower press-fit assembly (8) and are welded with a lower connecting copper bar (9). An upper output terminal (7) matched with the upper connecting copper bar (5) and a lower output terminal (11) matched with the lower connecting copper bar (9) are arranged at either end of the short side of the energy storage battery box (1); A cooling channel is formed between adjacent isolation kits (12), and an anti-corrosion component (14) is clamped in the cooling channel. The anti-corrosion component (14) includes a connecting plate (141), a supporting column (142), and an active corrosion column (143). The connecting plate (141) is made of the same material as the isolation kit (12). The metal activity of the active corrosion column (143) is higher than that of the isolation kit (12). One side of the long side of the energy storage battery box (1) is fixedly connected to an inlet manifold (18), and the other side is fixedly connected to a return manifold (20). The inlet manifold (18) and the return manifold (20) are both connected to the cooling channel. A plurality of throttle valves (19) are provided on the inlet manifold (18).

2. A low voltage distribution network power load balancing device according to claim 1, characterized in that: The upper press-fit assembly (4) has the same structure as the lower press-fit assembly (8) and is arranged in a mirror image in the energy storage battery box (1). The upper press-fit assembly (4) comprises a press-fit plate (41), a press-fit cavity (42), a sealing ring (43) and a side sealing sleeve (44). The press-fit plate (41) is fixedly mounted inside the energy storage battery box (1) by means of screws.

3. A low voltage distribution network power load balancing device according to claim 2, characterized in that: A press-fitting cavity (42) matching with the battery core (13) is provided on one side of the press-fitting plate (41) close to the battery core (13), and a sealing ring (43) is glued into the press-fitting cavity (42).

4. A low voltage distribution network power load balancing device according to claim 3, characterized in that: A side sealing sleeve (44) is glued to the circumference of the press-fitting cavity (42), and the cross-section of the side sealing sleeve (44) is trapezoidal.

5. The low voltage distribution network power load balancing device according to claim 1, characterized in that: The inner walls of the two long sides of the energy storage battery box (1) are provided with a plurality of snap-fit ​​seats (16) that cooperate with the isolation kit (12), and the interior of the snap-fit ​​seats (16) is glued with a sealing strip (17), and the isolation kit (12) is provided with a plurality of plug-in seats that cooperate with the battery core (13), and the ends of the plug-in seats are glued with a sealing ring (15).

6. The low voltage distribution network power load balancing device according to claim 1, characterized in that: An upper output copper bar (6) is embedded in one end of the energy storage battery box (1) close to the upper output terminal (7), one end of the upper output copper bar (6) is fixedly connected to the upper output terminal (7), and the other end is fixedly connected to the upper connecting copper bar (5); and a lower output copper bar (10) is embedded in one end of the energy storage battery box (1) close to the lower output terminal (11), one end of the lower output copper bar (10) is fixedly connected to the lower output terminal (11), and the other end is fixedly connected to the lower connecting copper bar (9).

7. The low voltage distribution network power load balancing device according to claim 1, characterized in that: The connecting plate (141) is clamped between adjacent isolation kits (12), and the connecting plate (141) is horizontally arranged inside the energy storage battery box (1) as a whole, and support columns (142) are vertically arranged at both ends of the connecting plate (141).

8. The low voltage distribution network power load balancing device according to claim 1, characterized in that: The connecting plate (141) and the isolation kit (12) are both made of copper, the active corrosion column (143) is nested in the middle of the connecting plate (141), and the active corrosion column (143) is made of zinc.

9. A method for using a low-voltage distribution network power load balancing device according to any one of claims 1 to 8, characterized in that: The steps include: S1, connecting the device to the power system through the upper output terminal (7) and the lower output terminal (11), and controlling the power system to store energy when the load is low and discharge energy when the load is high, so as to balance the load; S2, connecting the water inlet manifold (18) and the water return manifold (20) to the cooling liquid supply device in the prior art, the cooling liquid enters along the water inlet manifold (18), and the flow rate of the cooling liquid at different positions is limited by the throttle valve (19), so that the flow rate of the cooling liquid in the cooling channel at different positions tends to be consistent, the cooling liquid flows in the cooling channel, the heat of the battery core (13) when working is dissipated outward through the isolation kit (12), the cooling liquid absorbs the heat dissipated by the battery core (13) when flowing, and the battery core (13) is quickly cooled down, the cooling liquid flows out along the water return manifold (20), and flows back to the cooling liquid supply device in the prior art, the heated cooling liquid is cooled down, and the cooling liquid is driven to circulate in the cooling channel, and the battery core (13) is continuously cooled down; S3, after the upper press-fit assembly (4) and the lower press-fit assembly (8) are installed in the energy storage battery box (1), the upper press-fit assembly (4) and the lower press-fit assembly (8) are sealed with the energy storage battery box (1) through the side sealing sleeve (44), the upper press-fit assembly (4) and the lower press-fit assembly (8) are sealed with the end of the battery core (13) through the sealing ring (43), and the upper press-fit assembly (4) and the lower press-fit assembly (8) are sealed with the isolation kit (12) through the sealing ring (15) to prevent leakage of coolant; S4. The connecting plate (141) is positioned and installed in the cooling channel between adjacent isolation kits (12) through the support columns (142) at both ends. The connecting plate (141) contacts the isolation kits (12) on both sides. The connecting plate (141) and the isolation kits (12) are both made of copper. The active corrosion column (143) is made of zinc. The cathode protection method is used to prevent the isolation kit (12) from being corroded and damaged by the coolant by sacrificing the active corrosion column (143).

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