A voltage and current equalization control device for a battery string energy storage system

Abstract

The application provides a kind of group string energy storage system voltage and current sharing control device, its structure includes: positioning base, substrate, link line, power input module, voltage sharing control module, current sharing regulation module, output interface;The application is improved by substrate surface, and multiple flexible copper bars are positioned by the cooperation of restraint block and positioning peg, then the spring floating terminal is positioned by flexible copper bar combination terminal arrangement end, so that the cooperation of multiple flexible copper bars and spring floating terminal can replace the original fastening bolt for positioning and electrical connection, therefore, when the ambient temperature changes and the equipment vibrates, the laminated copper bar can be slightly bent and stretched, the floating terminal can produce slight displacement in axial and radial directions, the overall structure is no longer rigidly locked, the mechanical stress generated by thermal expansion and contraction and mechanical vibration is completely absorbed by copper sheet deformation and terminal floating, avoiding stress concentration at the connection root and fastening point, thus eliminating the problems of copper bar cracking and bolt loosening.

Description

Technical Field

[0001] This invention relates to the field of power electronic control technology, and more specifically to a voltage and current equalization control device for a string energy storage system. Background Technology

[0002] The string energy storage voltage and current equalization control device is a power electronics and measurement and control unit that performs independent voltage and current closed-loop control for each string / cluster of batteries in the string architecture. It can solve problems such as circulating current, voltage / current imbalance, and inconsistent SOC through acquisition, calculation, independent control, active balancing, and parallel operation on the AC side. Therefore, it can effectively improve the actual use stability of the string energy storage system. In summary, the inventors have found that existing voltage and current equalization control devices have the following main defects: Because the terminals of various modules in current voltage and current equalization control devices generally use rigid copper busbars with fastening bolts for positioning and electrical connection, these devices are subject to temperature cycles caused by frequent charging and discharging during long-term operation of the energy storage system. Furthermore, the mechanical vibrations present in outdoor containers, industrial and commercial computer rooms, and other environments cause the rigid copper busbars and terminals to continuously generate shear and compressive stresses due to thermal expansion and contraction. Therefore, the traditional rigid copper busbar hard connection structure cannot offset the mechanical stresses caused by thermal expansion and contraction and vibration, easily leading to copper busbar cracking, terminal loosening, and contact resistance drift, ultimately resulting in decreased current equalization accuracy and localized overheating. Summary of the Invention

[0003] The technical solution adopted by the present invention to achieve the technical objective is: a string energy storage system voltage and current equalization control device, the structure of which includes: a positioning base, a base plate, connecting lines, a power input module, a voltage equalization control module, a current equalization adjustment module, and an output interface. The positioning base covers and positions the edge of the base plate, and the connecting lines on the base plate allow the power input module to connect with the voltage equalization control module, the current equalization adjustment module, and the output interface.

[0004] As a further improvement of the present invention, the substrate surface is further provided with a restraining block, a positioning bolt, a flexible copper busbar, and a terminal arrangement end. The restraining block restrains the position of the positioning bolt and installs the flexible copper busbar on the substrate. The terminal arrangement end carried by the flexible copper busbar is connected to the connecting line.

[0005] As a further improvement of the present invention, the terminal arrangement end is further provided with: a connecting block, a terminal housing, an external electrical groove, an assembly block, a spring, a guide sleeve, and a conductive moving contact. The connecting block is integral with the edge of the terminal housing. The external electrical groove of the terminal housing is connected to an external circuit to energize the conductive moving contact inside the guide sleeve of the assembly block. The two ends of the spring are connected to the assembly block.

[0006] As a further improvement of the present invention, based on the flexible copper busbar provided on the substrate, the flexible copper busbar is positioned by the positioning bolt, and then the terminal arrangement end allows the terminal shell to carry the assembly block and spring and other components to be installed. Subsequently, the connection lines of each module will be connected to the conductive moving contact through the guide sleeve. In use, the spring floating electrical terminal composed of the flexible copper busbar and spring and other components can eliminate the mechanical stress caused by thermal expansion and contraction and vibration.

[0007] As a further improvement of the present invention, the positioning base is parallel to the substrate, and multiple connecting lines are provided on the substrate. The connecting lines are connected to and energized by the power input module, the voltage equalization control module, and the current equalization adjustment module, and finally the power is output from the output interface.

[0008] As a further improvement of the present invention, the restraining block and the positioning bolt are provided in two sets, which are symmetrically set on the flexible copper busbar and position the flexible copper busbar on the substrate. The flexible copper busbar is multi-layered.

[0009] As a further improvement of the present invention, the connecting block connects the terminal housing to the terminal arrangement end of the flexible copper busbar, and the external electrical tray can be connected to an external power source through the connecting line. The assembly block is provided with multiple sets of circular guide sleeves and conductive moving contacts to allow the terminals of the connecting line to be inserted, and is provided with springs to form spring-loaded floating terminals.

[0010] As a further improvement of the present invention, the restraining block is provided with a locking groove, which runs through the center of the calibration block, the top block, and the bottom block. The top block and the calibration block overlap each other. A vertical member is connected to the lower corner of the top block and inserted into the slot position of the bottom corner to clamp and position the flexible copper busbar vertically.

[0011] As a further improvement of the present invention, the locking groove is circular in shape and matches the shape of the positioning bolt. An insulating disk is provided on the surface of the calibration block and the locking groove passes through it. The vertical members at the lower corner of the top block are provided with a total of four, which match the number and position of the four slots at the corner of the bottom block surface.

[0012] As a further improvement of the present invention, the slot is also provided with an insulating block, a clamping frame is connected to the center of the insulating block, a clamping block is provided on the inner wall of the clamping frame, a magnetic suction plate is connected to the inner surface of the clamping frame and a central protrusion is connected to the center.

[0013] As a further improvement of the present invention, the insulating block is square in shape and is integrated with the corner of the bottom block by welding. The clamping frame of the insulating block allows the lower end of the vertical piece to be embedded. There are four clamping blocks on the inner wall of the clamping frame, which are spaced together with the magnetic plate and the central protrusion.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention improves the substrate surface by using a combination of restraining blocks and positioning bolts to position multi-layer flexible copper busbars. Then, the flexible copper busbars, combined with the terminal arrangement end, position the spring-loaded floating terminals. Thus, the combination of multi-layer flexible copper busbars and spring-loaded floating terminals can replace the original fastening bolts for positioning and electrical connection. Therefore, when the ambient temperature changes or the equipment vibrates, the laminated copper busbars can undergo slight bending and expansion deformation, and the floating terminals can generate slight displacement along the axial and radial directions. The overall structure is no longer rigidly locked. The mechanical stress generated by thermal expansion and contraction and mechanical vibration is completely absorbed by the deformation of the copper sheets and the floating of the terminals, avoiding stress concentration at the connection root and fastening point, and eliminating the problems of copper busbar cracking and bolt loosening from the root.

[0015] 2. With the improvement of the restraining block, the four sets of vertical parts at the lower corner of the top block can be vertically inserted into the four slots at the corner of the bottom block, thus achieving a precise assembly effect. At the same time, the locking of the positioning bolt can improve the positioning accuracy of the flexible copper busbar on the substrate and avoid displacement and detachment. Therefore, the connection stability between the flexible copper busbar and the substrate can be improved. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of a pressure and current equalization control device for a string energy storage system.

[0017] Figure 2 This is a schematic diagram of a structure with a flexible copper busbar mounted on a base.

[0018] Figure 3 This is a schematic diagram of a spring-loaded floating terminal block, which is part of a terminal arrangement.

[0019] Figure 4 This is a schematic diagram of a three-dimensional structure of an improved restraint block.

[0020] Figure 5 This is a top-view structural diagram of a slot position improvement.

[0021] In the diagram: Positioning base-1, base plate-2, connecting circuit-3, power input module-4, voltage equalization control module-5, current equalization adjustment module-6, output interface-7; 21. Restraining block; 22. Positioning bolt; 23. Flexible copper busbar; 24. Terminal arrangement end. Connecting block-241, terminal housing-242, external electrical channel-243, assembly block-244, spring-245, guide sleeve-246, conductive moving contact-247; Locking slot-211, calibration block-212, top block-213, vertical piece-214, slot-215, bottom block-216; Insulating block-2151, clamping frame-2152, clamping block-2153, magnetic suction plate-2154, central protrusion-2155. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings: Example 1: Figures 1 to 5 As shown: This invention provides a pressure and current equalization control device for a string energy storage system. Its structure includes: a positioning base 1, a substrate 2, connecting lines 3, a power input module 4, a voltage equalization control module 5, a current equalization adjustment module 6, and an output interface 7. The positioning base 1 covers and positions the edge of the substrate 2, and the connecting lines 3 on the substrate 2 enable the power input module 4 to communicate with the voltage equalization control module 5, the current equalization adjustment module 6, and the output interface 7.

[0023] The substrate 2 is further provided with a restraining block 21, a positioning bolt 22, a flexible copper busbar 23, and a terminal arrangement end 24. The restraining block 21 restrains the position of the positioning bolt 22 and installs the flexible copper busbar 23 on the substrate 2. The terminal arrangement end 24 carried by the flexible copper busbar 23 is connected to the connecting line 3.

[0024] The terminal arrangement end 24 is further provided with: a connecting block 241, a terminal housing 242, an external electrical channel 243, an assembly block 244, a spring 245, a guide sleeve 246, and a conductive moving contact 247. The connecting block 241 is integrated with the edge of the terminal housing 242. The external electrical channel 243 of the terminal housing 242 is connected to an external line to energize the conductive moving contact 247 inside the guide sleeve 246 of the assembly block 244. The two ends of the spring 245 are connected to the assembly block 244.

[0025] Based on the flexible copper busbar 23 set on the substrate 2, the flexible copper busbar 23 is positioned by the positioning bolt 22. Then, the terminal arrangement end 24 allows the terminal housing 242 to carry the assembly block 244 and spring 245 and other components to be installed. Subsequently, the connection line 3 of each module will be connected to the conductive moving contact 247 through the guide sleeve 246. In use, the spring floating electrical terminal composed of the flexible copper busbar 23 and spring 245 can eliminate the mechanical stress caused by thermal expansion and contraction and vibration.

[0026] The positioning base 1 is parallel to the base plate 2. The base plate 2 is provided with multiple connecting lines 3. The connecting lines 3 are connected to and powered by the power input module 4, the voltage equalization control module 5, and the current equalization adjustment module 6. Finally, the power is output from the output interface 7.

[0027] The restraining block 21 and the positioning bolt 22 are provided in two sets and are set symmetrically on the flexible copper busbar 23 to position the flexible copper busbar 23 on the substrate 2. The flexible copper busbar 23 is multi-layered.

[0028] The connecting block 241 connects the terminal housing 242 to the terminal arrangement end 24 of the flexible copper busbar 23. The external electrical tray 243 can be connected to an external power source through the connecting line 3. The assembly block 244 is provided with multiple sets of circular guide sleeves 246 and conductive moving contacts 247 to allow the terminals of the connecting line 3 to be inserted, and is provided with springs 245 to form a spring-loaded floating terminal.

[0029] The restraining block 21 is provided with a locking groove 211, which passes through the center of the calibration block 212, the top block 213, and the bottom block 216. The top block 213 overlaps with the calibration block 212. The lower corner of the top block 213 is connected to a vertical member 214, which is inserted into the slot 215 at the corner of the bottom block 216 to clamp and position the flexible copper busbar 23 vertically.

[0030] The locking groove 211 is circular and matches the shape of the positioning bolt 22. The surface of the calibration block 212 is provided with an insulating disk through which the locking groove 211 passes. The vertical members 214 at the lower corner of the top block 213 are provided with four members that match the number and position of the four slots 215 at the corner of the bottom block 216.

[0031] The slot 215 is also provided with an insulating block 2151. A clamping frame 2152 is connected to the center of the insulating block 2151. A clamping block 2153 is provided on the inner wall of the clamping frame 2152. A magnetic suction plate 2154 is connected to the inner surface of the clamping frame 2152 and a central protrusion 2155 is connected to the center.

[0032] The insulating block 2151 is square in shape and is integrated with the corner of the bottom block 216 by welding. The clamping frame 2152 of the insulating block 2151 allows the lower end of the vertical member 214 to be embedded. There are four clamping blocks 2153 on the inner wall of the clamping frame 2152, which are spaced together with the magnetic plate 2154 and the central protrusion 2155.

[0033] The specific functions and operation procedures of this embodiment are as follows: In this invention, the string energy storage voltage and current equalization control device, under the string architecture, is a power electronics and measurement and control unit that performs independent voltage and current closed-loop control for each string / cluster of batteries. The entire device can be positioned by the positioning base 1, and then the power input block 4, voltage equalization control module 5, and current equalization adjustment module 6 on the substrate 2 perform data acquisition, calculation, independent control, active balancing, and AC side parallel operation. This effectively solves problems such as circulating current, voltage / current imbalance, and inconsistent SOC in string energy storage systems, thus effectively improving the actual stability of string energy storage systems. However, during operation, the multi-layer flexible copper busbar 23 set on the substrate 2 can be fixed by the restraint block 21 and the positioning bolt 22. The terminal block 24 is stably mounted on the substrate 2. Then, the terminal housing 242 is connected to the connecting block 241 for installation and positioning using the terminal arrangement end 24. Subsequently, the external electrical groove 243 provided on the terminal housing 242 is connected to the power supply through one of the connecting lines 3, which allows the conductive moving contact 247 in the assembly block 244 to be energized. Therefore, the guide sleeve 246 on the assembly block 244 can assist the power input block 4 and the voltage equalization control module 5 and current equalization adjustment module 6 in accurately connecting and energizing the terminals of the connecting line 3. At the same time, during long-term operation, due to changes in ambient temperature and vibration of the equipment, the multi-layer flexible copper busbar 23 can undergo slight bending and expansion deformation. Meanwhile, the internal structure of the terminal housing 242 of the terminal arrangement end 24... The spring 245 allows the conductive moving contact 247 on the assembly block 244 to generate slight displacement along the axial and radial directions, enabling it to replace traditional fastening bolts for positioning and electrical connection. The overall structure is no longer rigidly locked, and the mechanical stress generated by thermal expansion and contraction and mechanical vibration is completely absorbed by the deformation of the copper sheet and the floating of the terminals, avoiding stress concentration at the connection root and fastening point. This eliminates the problems of copper busbar cracking and bolt loosening from the root, thus effectively improving the stability of the pressure equalization and current equalization control device and preventing terminal damage. Furthermore, the top block 213 of the restraint block 21 can determine the position of the locking groove 211 through the center calibration block 212, while the four sets of vertical members 214 at the lower corner of the top block 213... The flexible copper busbar 23 is inserted into the slot 215 of the base block 216 through the connection position, forming a precise insertion effect. Finally, the positioning bolt 22 is precisely vertically locked, which further improves the vertical stability of the flexible copper busbar 23 on the substrate 2 through the upper and lower limits. At the same time, during insertion, the insulating block 2151 set on the slot 215 can use the internal clamping frame 2152 to insert the bottom end of the vertical member 214. After insertion, the clamping block 2153, magnetic suction plate 2154, and central protrusion 2155 limit the position, thereby effectively improving the precision and firmness of the splicing and avoiding power conduction leakage through the insulation protection effect, indirectly improving the use effect of the voltage and current equalization control device.

[0034] Any technical solution that achieves the above-mentioned technical effects by utilizing the technical solutions described in this invention, or by designing similar technical solutions by those skilled in the art under the inspiration of the technical solutions described in this invention, falls within the protection scope of this invention.

Claims

1. A pressure and current equalization control device for a string energy storage system, comprising: The system comprises a positioning base (1), a substrate (2), connecting lines (3), a power input module (4), a voltage equalization control module (5), a current equalization adjustment module (6), and an output interface (7). The positioning base (1) covers and positions the edge of the substrate (2). The connecting lines (3) on the substrate (2) connect the power input module (4) to the voltage equalization control module (5), the current equalization adjustment module (6), and the output interface (7). The system is characterized by: The substrate (2) is also provided with a restraining block (21), a positioning bolt (22), a flexible copper busbar (23), and a terminal arrangement end (24). The restraining block (21) restrains the position of the positioning bolt (22) and installs the flexible copper busbar (23) on the substrate (2). The terminal arrangement end (24) carried by the flexible copper busbar (23) is connected to the connecting line (3). The terminal arrangement end (24) is also provided with: a connecting block (241), a terminal housing (242), an external electrical channel (243), an assembly block (244), a spring (245), a guide sleeve (246), and a conductive moving contact (247). The connecting block (241) is integrated with the edge of the terminal housing (242). The external electrical channel (243) of the terminal housing (242) is connected to the external line so that the conductive moving contact (247) inside the guide sleeve (246) of the assembly block (244) is energized. The two ends of the spring (245) are connected to the assembly block (244).

2. The string energy storage system pressure and current equalization control device according to claim 1, characterized in that: Based on the flexible copper busbar (23) set on the substrate (2), the flexible copper busbar (23) is positioned by the positioning bolt (22). Then, the terminal arrangement end (24) allows the terminal housing (242) to carry the assembly block (244) and spring (245) and other components into the terminal. Subsequently, the connection lines (3) of each module will be connected to the conductive moving contact (247) through the guide sleeve (246). When in use, the spring floating terminal composed of the flexible copper busbar (23) and spring (245) can eliminate the mechanical stress caused by thermal expansion and contraction and vibration.

3. The string energy storage system pressure and current equalization control device according to claim 1, characterized in that: The positioning base (1) is parallel to the base plate (2). Multiple connecting lines (3) are provided on the base plate (2). The connecting lines (3) are connected to the power input module (4), the voltage equalization control module (5), and the current equalization adjustment module (6) and powered on. Finally, power is output from the output interface (7).

4. The string energy storage system pressure and current equalization control device according to claim 1, characterized in that: The restraining block (21) and the positioning bolt (22) are provided in two sets, which are set symmetrically on the flexible copper busbar (23) and position the flexible copper busbar (23) on the substrate (2). The flexible copper busbar (23) is multi-layered.

5. The string energy storage system pressure and current equalization control device according to claim 1, characterized in that: The connecting block (241) connects the terminal housing (242) to the terminal arrangement end (24) of the flexible copper busbar (23). The external electrical tray (243) can be connected to the external power supply through the connecting line (3). The assembly block (244) is provided with multiple sets of circular guide sleeves (246) and conductive moving contacts (247) to allow the terminals of the connecting line (3) to be inserted and is provided with springs (245) to form spring-loaded floating terminals.

6. The string energy storage system pressure and current equalization control device according to claim 1, characterized in that: The restraining block (21) is provided with a locking groove (211). The locking groove (211) passes through the center of the calibration block (212), the top block (213), and the bottom block (216). The top block (213) overlaps with the calibration block (212). The lower corner of the top block (213) is connected to a vertical piece (214) and inserted into the slot (215) at the corner of the bottom block (216) to clamp and position the flexible copper busbar (23) vertically.

7. The string energy storage system pressure and current equalization control device according to claim 1, characterized in that: The locking groove (211) is circular and matches the shape of the positioning bolt (22). The surface of the calibration block (212) is provided with an insulating disk that allows the locking groove (211) to pass through. The vertical members (214) at the lower corner of the top block (213) are provided with four pins that match the number and position of the four slots (215) at the corner of the bottom block (216).

8. The string energy storage system pressure and current equalization control device according to claim 6, characterized in that: The slot (215) is also provided with an insulating block (2151), a clamping frame (2152) is connected to the center of the insulating block (2151), a clamping block (2153) is provided on the inner wall of the clamping frame (2152), a magnetic suction plate (2154) is connected to the inner surface of the clamping frame (2152), and a central protrusion (2155) is connected to the center.

9. The string energy storage system pressure and current equalization control device according to claim 8, characterized in that: The insulating block (2151) is square in shape and is welded to the corner of the bottom block (216). The clamping frame (2152) of the insulating block (2151) allows the lower end of the vertical piece (214) to be embedded. There are four clamping blocks (2153) on the inner wall of the clamping frame (2152) and they are spaced together with the magnetic plate (2154) and the central protrusion (2155).

Images