Energy storage battery pack of energy storage station

Abstract

The present invention relates to the technical field of energy storage equipment, and discloses an energy storage battery pack of an energy storage station, the energy storage battery pack comprises a battery box body, lithium battery packs are arranged in the battery box body, the two ends of the battery box body are provided with centralized heat dissipation mechanisms, and the centralized heat dissipation mechanisms at the two ends perform heat dissipation and ventilation on the interior of the battery box body; a plurality of groups of moving tracks are arranged in the battery box body, the lithium battery packs are arranged on the moving tracks, and positive and negative electrodes of the lithium battery packs are connected through electrode plates; the lithium battery pack comprises a heat dissipation assembly and a battery module, and the heat dissipation assembly comprises two heat transfer elements which are attached to the outer walls of the two sides of the battery module. The contact distance and pressure between the heat transfer element and the battery module are adjusted in real time through the active thermal contact adjusting mechanism, the temperature gradient in the system is reduced, the temperature sensitive self-activation mechanism can automatically increase the contact pressure when the temperature exceeds a preset threshold value, and the service life of the retired battery is prolonged by effectively controlling the temperature distribution of the retired battery. And the temperature difference in the battery pack is reduced.

Description

Technical Field

[0001] This invention relates to the field of energy storage equipment, and more specifically, to an energy storage battery pack for an energy storage station. Background Technology

[0002] The energy storage compartment for retired electric vehicle batteries adopts a standardized modular design, assembling batteries with similar capacity and internal resistance characteristics into uniformly sized modular units, which are then installed within the storage compartment. Each module is equipped with a simple vapor chamber and temperature sensor, and a wind-cooling system provides identical cooling conditions for all modules. After initial testing, retired batteries are graded according to performance and assembled into energy storage modules of different grades for use.

[0003] Because retired batteries have experienced significant differences in the number of charge-discharge cycles, usage environment, and degree of aging, even batteries classified as the same performance level exhibit very different thermal characteristics. Some hot batteries have temperatures that are more than 15°C higher than the surrounding batteries. Ideally, the temperature of the entire system should be balanced, rather than some areas being too cold while other areas remain too hot, in order to avoid thermal stress and excessively low temperatures in some batteries.

[0004] Existing uniform cooling solutions cannot address these differentiated thermal characteristics, resulting in persistent local hot spots. This not only accelerates the aging of hot-spot batteries but also significantly increases the risk of thermal runaway, shortening the lifespan of the entire energy storage system. Summary of the Invention

[0005] This invention provides an energy storage battery pack for an energy storage station, which solves the technical problem that existing uniform cooling solutions in related technologies cannot specifically address the different thermal characteristics between battery packs, leading to localized hot spots.

[0006] The present invention provides an energy storage battery pack for an energy storage station, comprising:

[0007] The beneficial effects of this invention are as follows:

[0008] This invention solves the problem of local hot spots caused by significant differences in thermal characteristics of retired batteries through a dual-mode thermal connection design distributed in an array. The active thermal contact adjustment mechanism adjusts the contact distance and pressure between the heat transfer element and the battery module in real time, realizing differentiated heat dissipation for batteries with different thermal characteristics, effectively reducing the temperature gradient inside the system. The temperature-sensitive self-activating mechanism automatically increases the contact pressure without external energy when the temperature exceeds a preset threshold, improving heat conduction efficiency. By effectively controlling the temperature distribution of retired batteries, the temperature difference inside the battery pack is reduced, reducing thermal stress caused by uneven temperature, and avoiding the problem of some batteries overheating and accelerating aging or being too cold and affecting performance.

[0009] In summary, by balancing the temperature of each battery module, the lifespan of the entire retired battery energy storage system has been extended. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of an energy storage battery pack for an energy storage station proposed in this invention;

[0011] Figure 2 This is the invention Figure 1 Schematic diagram of the connection structure of a medium-sized lithium battery pack;

[0012] Figure 3 This is the invention Figure 2 A schematic diagram of the connection structure between the active thermal contact adjustment mechanism and the lithium battery pack;

[0013] Figure 4 This is the invention Figure 2 A top view of the adjustment process (A, B, and C in the figure represent three adjacent lithium battery packs).

[0014] Figure 5 This is the invention Figure 2 Schematic diagram of the internal structure of the heat transfer element;

[0015] Figure 6 This is the invention Figure 2 A schematic diagram of the structure of the middle electrode plate.

[0016] In the diagram: 100, battery housing; 110, moving track; 200, lithium battery pack; 210, battery module; 220, heat transfer element; 221, plate; 222, heat transfer and heat dissipation copper pipe; 230, electrode plate; 231, sliding groove; 300, track assembly; 310, telescopic cylinder; 320, translation track; 330, electrical control connector; 331, return spring; 332, telescopic terminal; 340, connecting piece; 400, heat dissipation fins; 500, centralized heat dissipation mechanism. Detailed Implementation

[0017] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the subject matter described herein, and changes may be made to the function and arrangement of the elements discussed without departing from the scope of this specification. Various processes or components may be omitted, substituted, or added as needed in the examples. Furthermore, features described in some examples may be combined in other examples.

[0018] like Figures 1-6 As shown, an energy storage battery pack for an energy storage station includes a battery housing 100, a lithium battery pack 200, an active thermal contact adjustment mechanism, heat dissipation fins 400, and a centralized heat dissipation mechanism 500.

[0019] The lithium battery pack 200 is arranged inside the battery box 100. At both ends of the battery box 100, there are centralized heat dissipation mechanisms 500, which dissipate heat and ventilate the battery box 100.

[0020] The battery housing 100 is provided with several sets of moving tracks 110, and several sets of lithium battery packs 200 are arranged on the moving tracks 110. The positive and negative terminals of the lithium battery packs 200 are connected through electrode plates 230, and the positive and negative terminals of the lithium battery packs 200 are connected in series through the electrode plates 230. The inner sidewall of the electrode plate 230 is provided with a sliding groove 231, and the positive and negative terminals of the lithium battery packs 200 are connected in the sliding groove 231 of the electrode plate 230. The electrode plate 230 and the lithium battery packs 200 are stably connected.

[0021] The lithium battery pack 200 includes a heat dissipation component and a battery module 210. The heat dissipation component includes two heat transfer elements 220, which are attached to the outer walls on both sides of the battery module 210. Each heat transfer element 220 includes a plate 221 and a heat transfer copper pipe 222. The heat transfer copper pipe 222 is built into the plate 221, and the end of the heat transfer copper pipe 222 is connected to the heat dissipation fin 400. Both ends of the heat dissipation fin 400 are provided with heat dissipation fans. The heat dissipation fans are used to guide the heat of the heat dissipation fin 400 to the centralized heat dissipation mechanism 500, and then to the outside of the energy storage battery pack.

[0022] It should be noted that the heat transfer element 220 on the middle lithium battery pack 200 is fixed on the moving track 110, or the heat transfer element 220 on the middle lithium battery pack 200 is fixed on the moving track 110.

[0023] The active thermal contact adjustment mechanism includes an electronically controlled connector 330 and a track assembly 300. The electronically controlled connector 330 is disposed in the middle of both sides of the heat transfer element 220. The track assembly 300 is installed on the outer walls of both sides of the lithium battery pack 200. The track assembly 300 includes a telescopic cylinder 310, a translational track 320 and a connector 340. The connector 340 is laid on the inner side wall of the translational track 320 and is used to cooperate with the electromagnetic block. The telescopic cylinder 310 is installed on the inner side wall of the battery box 100, and the telescopic end of the telescopic cylinder 310 is connected to the end of the translational track 320.

[0024] The electronic control connector 330 includes a base, a telescopic terminal 332, a return spring 331, and an electromagnetic block. The electromagnetic block is installed inside the telescopic terminal 332, and the return spring 331 is sleeved on the telescopic terminal 332. The telescopic terminal 332 is inserted into the base. The coupling 340 is a flat electromagnet coupling component. When the electromagnetic block is electromagnetically coupled with the coupling 340, the telescopic terminal 332 is connected to the translation track 320. When the telescopic end of the telescopic cylinder 310 drives the translation track 320 to translate, the heat transfer element 220 where the electronic control connector 330 is coupled with the coupling 340 also translates accordingly. The lithium battery pack 200 moves along the moving track 110. When the spacing of the heat transfer elements 220 between the lithium battery packs 200 is adjusted to the correct position, the electromagnetic connection between the electromagnetic block and the coupling 340 is released. The return spring 331 drives the telescopic terminal 332 to reset, and the connection with the coupling 340 is released. At this time, the lithium battery pack 200 is also positioned on the moving track 110.

[0025] The heat dissipation fins 400 have heat collection copper pipes extending to their ends, which extend into the centralized heat dissipation mechanism 500. The centralized heat dissipation mechanism 500 includes cooling fans arranged in a row, which guide the heat collected by the heat collection copper pipes.

[0026] The temperature-sensitive self-activation mechanism serves as a backup mechanism, which can automatically increase the contact pressure between the heat transfer element 220 and the battery module 210 without external energy when the temperature exceeds a preset threshold, and can automatically reset after the temperature drops.

[0027] The temperature-sensitive self-activating mechanism includes a temperature-sensitive element and a pressure detection sensor. The temperature-sensitive element is a bimetallic strip, one end of which is fixed to the outer wall of the battery module 210, and the other end is connected to the outer wall of the heat transfer element 220. When the temperature exceeds a preset threshold, due to the different thermal expansion coefficients of the two metal layers of the bimetallic strip, the bimetallic strip automatically bends, pushing the heat transfer element 220 towards the battery module 210, increasing the contact pressure. The pressure monitoring sensor is set between the heat transfer element 220 and the battery module 210 to monitor the contact pressure between the battery module 210 and the heat transfer element 220.

[0028] A distributed temperature monitoring system is installed at the connection between the battery module 210 and the heat transfer element 220 to collect temperature data in real time. The distributed temperature monitoring system includes a temperature sensor and a signal transmission device. The temperature sensor collects temperature data, and the signal transmission device transmits the temperature data to the intelligent thermal management control system.

[0029] In some embodiments, to ensure system reliability, the temperature sensors are redundantly designed, with multiple temperature sensors arranged on the surface of each battery module 210.

[0030] The intelligent thermal management and control system receives temperature data collected by the distributed temperature monitoring system, analyzes the temperature distribution, identifies hot spot locations, and controls the active thermal contact adjustment device to adjust the distance between the heat transfer elements 220 and the contact pressure between the heat transfer elements 220.

[0031] Based on the structure of the energy storage battery pack described above, the working steps of the thermal difference management system for the energy storage battery pack are as follows:

[0032] System initialization phase: After the system is powered on, the intelligent thermal management and control system performs a self-test to detect the working status of each component, including the active thermal contact adjustment mechanism, the temperature-sensitive self-activation mechanism, and the distributed temperature monitoring system. At the same time, the distributed temperature monitoring system collects the initial temperature data of each battery module 210, establishes a temperature reference, and after initialization is completed, the system enters the normal working state.

[0033] Real-time temperature monitoring phase: During normal system operation, the distributed temperature monitoring system continuously collects temperature data from each battery module 210 and transmits the data to the intelligent thermal management control system. The intelligent thermal management control system analyzes and processes the temperature data to identify abnormal temperature areas and hot spots.

[0034] Differentiated thermal management stage: Based on the temperature monitoring results, the intelligent thermal management control system determines the battery module 210 that needs to be cooled down, and sends a control command to the active thermal contact adjustment mechanism at the corresponding position. After receiving the command, the active thermal contact adjustment mechanism drives the moving track 110 to move through the telescopic cylinder 310, thereby adjusting the contact distance and contact pressure between the lithium battery pack 200 that needs to be adjusted and the lithium battery packs 200 on both sides, thus improving the heat transfer efficiency.

[0035] When the electromagnetic block is electromagnetically engaged with the connector 340, the telescopic terminal 332 is connected to the translation track 320. When the telescopic end of the telescopic cylinder 310 drives the translation track 320 to move, the heat transfer element 220 where the electronic control connector 330 is engaged with the connector 340 also moves accordingly. The lithium battery pack 200 moves along the moving track 110. When the spacing of the heat transfer elements 220 between the lithium battery packs 200 is adjusted to the correct position, the electromagnetic engagement between the electromagnetic block and the connector 340 is released, and the lithium battery pack 200 is positioned on the moving track 110. If it is necessary to adjust the contact pressure, in addition to the pressure in the self-activation protection stage, the two heat transfer components in the same lithium battery pack 200 can be moved towards the battery module 210 to increase the contact pressure.

[0036] Specifically, the telescopic cylinder 310 on one side drives the heat transfer element 220 on one side of the lithium battery pack 200 to move horizontally, while the telescopic cylinder 310 on the other side drives the heat transfer element 220 on the other side of the same lithium battery pack 200 to move horizontally. The two horizontal movements are in opposite directions, but both bring the heat transfer element 220 to the end face of the battery module 210 to increase the contact pressure.

[0037] For hot spots with high temperatures, increase the contact pressure; for areas with low temperatures, appropriately reduce the contact pressure or maintain the original pressure to achieve differentiated thermal management.

[0038] Self-activation protection phase: When the temperature of a battery module 210 suddenly rises above a preset threshold, the temperature-sensitive self-activation mechanism at the corresponding location automatically responds without external power. For example, the shape memory alloy automatically deforms at high temperatures, pushing the heat transfer element 220 towards the battery module 210, increasing contact pressure, improving heat conduction efficiency, and quickly removing heat. When the temperature drops, it can be assisted by an active thermal contact adjustment mechanism. The shape memory alloy will also reset at low temperatures, together restoring the heat transfer element 220 to its initial position.

[0039] Closed-loop regulation phase: The system continuously monitors hotspot temperature changes and dynamically adjusts heat transfer efficiency based on feedback data. If the temperature in a hotspot area drops to a safe range, the active thermal contact regulation mechanism will appropriately reduce the distance and contact pressure between the components; if the temperature continues to rise, the contact pressure and distance will be further increased; through this closed-loop control method, dynamic temperature balance of the system is achieved.

[0040] Combination Figure 4When the energy storage battery packs of this energy storage station are in use, based on the temperature monitoring results, the intelligent thermal management control system determines which battery modules 210 require priority heat dissipation and sends control commands to the corresponding active thermal contact adjustment mechanisms. After receiving the commands, the active thermal contact adjustment mechanisms, for example, if the temperature of lithium battery pack B 200 is abnormal, need to adjust its contact pressure and the distance between lithium battery pack 200 and the two adjacent lithium battery packs 200, that is, the spacing between the three lithium battery packs A, B, and C, connect the electronically controlled connectors 330 of the heat transfer elements 220 on both sides of lithium battery pack B 200 to the guide rail assembly, and the telescopic cylinder 310 drives the flat... When the translation track 320 moves, lithium battery packs A and B move together toward the side wall of the battery box 100. After the distance between lithium battery pack B and lithium battery pack C is adjusted, the connection between the electronic control connector 330 on lithium battery pack B and the connecting piece 340 of the translation track 320 is released. At this time, the electronic control connector 330 on lithium battery pack B and the connecting piece 340 of the translation track 320 are engaged. The translation track 320 continues to move, driving the distance between lithium battery pack A and lithium battery pack B to adjust, thereby realizing the distance adjustment between the three lithium battery packs A, B and C.

[0041] During the adjustment process, the electrodes on the battery module 210 in the lithium battery pack 200 are always connected to the electrode plate 230. The electrodes are slidably connected in the sliding groove 231 of the electrode plate 230. The end of the heat collection copper tube slides in the heat dissipation fin 400, but it is always abutted and connected in the heat dissipation fin 400.

[0042] The embodiments of the present invention have been described above, but the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention, all of which are within the protection scope of the present invention.

Claims

1. An energy storage battery pack of an energy storage station, characterized by, The battery box, the lithium battery pack, the active thermal contact adjusting mechanism, the heat dissipation fin and the concentrated heat dissipation mechanism are included. The lithium battery pack is arranged in the battery box, and the concentrated heat dissipation mechanism is arranged at both ends of the battery box to dissipate heat and ventilate the battery box. The lithium battery pack includes the heat dissipation assembly and the battery module, the heat dissipation assembly includes two heat transfer elements, the two heat transfer elements are attached to the two side outer walls of the battery module, the heat transfer element is internally provided with a heat transfer and heat dissipation copper pipe, and the end of the heat transfer and heat dissipation copper pipe is connected to the heat dissipation fin. The active thermal contact adjusting mechanism includes the electric control connecting piece and the track assembly, the electric control connecting piece is arranged at the middle part of the two sides of the heat transfer element, the track assembly is installed on the two side outer walls of the lithium battery pack, the track assembly includes the telescopic air cylinder, the translation track and the combination piece, the telescopic end of the telescopic air cylinder is connected to the end of the translation track, when the telescopic end of the telescopic air cylinder drives the translation track to translate, the heat transfer element, to which the electric control connecting piece combined with the combination piece, also translates. The end of the heat dissipation fin extends the heat collection copper pipe, the heat collection copper pipe extends into the concentrated heat dissipation mechanism, the concentrated heat dissipation mechanism includes the arranged and distributed heat dissipation fan, and the heat dissipation fan guides the heat collection of the heat collection copper pipe.

2. An energy storage battery pack for an energy storage station according to claim 1, wherein, When the electromagnetic block is electromagnetically combined with the combination piece, the telescopic terminal is connected into the translation track, the lithium battery pack moves along the moving track, when the spacing of the heat transfer elements between the lithium battery packs is adjusted in place, the electromagnetic combination relationship between the electromagnetic block and the combination piece is released, and the lithium battery pack is also positioned on the moving track at this time.

3. An energy storage battery pack of an energy storage station according to claim 2, characterized in that, The positive and negative poles of the lithium battery pack are connected in series through the electrode plates, the inner side wall of the electrode plate is provided with a sliding groove, the positive and negative poles of the lithium battery pack are connected in the sliding groove of the electrode plate, and the electrode plate and the lithium battery pack are stably connected.

4. An energy storage battery pack of an energy storage station according to claim 3, wherein, The two ends of the heat dissipation fin are provided with heat dissipation fans, the heat dissipation fans are used for guiding the heat of the heat dissipation fin into the concentrated heat dissipation mechanism and then to the outside of the energy storage battery pack.

5. An energy storage battery pack of an energy storage station according to claim 4, wherein, The electric control connecting piece includes the seat body, the telescopic terminal, the reset spring and the electromagnetic block, the electromagnetic block is installed in the inside of the telescopic terminal, the reset spring is sleeved on the telescopic terminal, the telescopic terminal is inserted into the seat body, and the combination piece is a flat electromagnetic iron matching piece.

6. An energy storage battery pack of an energy storage station according to claim 5, wherein, The combination piece is laid on the inner side wall of the translation track, and the combination piece is used in cooperation with the electromagnetic block.

7. An energy storage battery pack of an energy storage station according to claim 6, characterized in that, The temperature sensitive self-activation mechanism is also included, when the temperature exceeds the preset threshold value, the temperature sensitive self-activation mechanism automatically increases the contact pressure of the heat transfer element and the battery module, and the temperature sensitive self-activation mechanism can automatically reset after the temperature decreases.

8. An energy storage battery pack of an energy storage station according to claim 7, characterized by, The temperature sensitive self-activation mechanism includes a temperature sensitive element, the temperature sensitive element is a bimetallic strip, one end of the bimetallic strip is fixed on the outer wall of the battery module, the other end is connected to the outer wall of the heat transfer element, when the temperature exceeds the preset threshold value, due to the different thermal expansion coefficients of the two layers of metals of the bimetallic strip, the bimetallic strip automatically bends and pushes the heat transfer element to move towards the battery module, thereby increasing the contact pressure.

9. An energy storage battery bank for an energy storage station according to claim 8, wherein, The temperature sensitive self-activation mechanism also includes a pressure detection sensor, the pressure detection sensor is arranged between the heat transfer element and the battery module, and is used for monitoring the contact pressure between the battery module and the heat transfer element.

10. An energy storage battery bank of an energy storage station according to claim 9, characterized in that, The distributed temperature monitoring system is arranged at the connection between the battery module and the heat transfer element, and is used for collecting temperature data in real time. The distributed temperature monitoring system comprises a temperature sensor and a signal transmission device. The temperature sensor collects temperature data, and the signal transmission device transmits the temperature data to the intelligent thermal management control system. The intelligent thermal management control system receives the temperature data collected by the distributed temperature monitoring system, analyzes the temperature distribution, identifies the hot spot position, and controls the active thermal contact adjusting device to adjust the distance between the heat transfer elements and the contact pressure between the heat transfer elements.

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