Thermal management system for rapid equalizing charging of energy storage battery pack

Abstract

The utility model discloses a thermal management system for rapid equalizing charging of an energy storage battery pack. The system comprises a plurality of thermal management devices connected in parallel between adjacent batteries PACKs. The heat management device is composed of a main body frame and a cover plate, an internal middle partition plate divides a cavity into two independent cavities and is filled with a liquid heat-conducting medium, and an integrated water inlet valve and an integrated water outlet valve are arranged on the two sides of the middle partition plate and are connected through a heat-conducting pipe embedded in the heat-conducting medium. The system has many advantages, and liquid in the adjacent heat management devices flows in the same direction to improve the heat dissipation stability; the heat-conducting silica gel layer strengthens heat conduction; the metal frame and the cover plate are beneficial to heat dissipation; the temperature sensor monitors and transmits a temperature signal in real time; the reasonably-designed heat conduction pipe gaps and brass materials are matched with water as a heat conduction medium, so that the heat dissipation efficiency is guaranteed, and the cost is controlled. The system effectively solves the problem of non-uniform temperature during rapid charging of the battery pack, prolongs the service life of the battery, and improves the performance and safety.

Description

Technical Field

[0001] This article discusses a thermal management system for rapid equalization charging of energy storage battery packs. Background Technology

[0002] With the rapid development of energy storage technology, energy storage battery packs are being used more and more widely in various fields. During the fast charging process of energy storage battery packs, a large amount of heat is generated due to the chemical reactions inside the battery and the differences in the internal resistance of the cells. If this heat cannot be dissipated in a timely and even manner, it will lead to uneven temperature distribution among the batteries in the battery pack.

[0003] On the one hand, localized overheating can accelerate battery aging, reduce battery life and performance, and in severe cases may even cause an explosion; on the other hand, uneven temperature can affect the battery's charging and discharging efficiency, making it difficult for the battery to achieve balanced charging.

[0004] Therefore, in medium and large-scale energy storage scenarios, especially those designed with balanced fast charging, it is necessary to focus on the collaborative heat dissipation design during the balanced charging process to solve the problems of rapid and uneven temperature rise during charging. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of the existing technology and provide a thermal management system for rapid equalization charging of energy storage battery packs. This thermal management system addresses the uneven temperature distribution of the battery pack during rapid charging and proposes a corresponding thermal management scheme under equalization charging conditions. The specific scheme is as follows:

[0006] A thermal management system for rapid equalization charging of energy storage battery packs includes several thermal management devices connected in parallel, wherein the thermal management devices are located between two adjacent battery packs.

[0007] The thermal management device includes a main frame and a cover plate. The main frame has an internal partition plate that separates the internal cavity of the main frame into two independent cavity structures. Both independent cavity structures are filled with a liquid heat-conducting medium.

[0008] An integrated water inlet valve and an integrated water outlet valve are respectively provided on both sides of the middle partition. The integrated water inlet valve and the integrated water outlet valve are connected by a heat-conducting pipe, which is embedded in the heat-conducting medium.

[0009] To improve heat dissipation uniformity and prevent excessive differences in heat dissipation conditions between different battery packs, the liquid flow direction in two adjacent thermal management devices is consistent.

[0010] To further improve the thermal conductivity of the interface, a thermally conductive silicone layer is provided on the contact surface between the thermal management device and the battery PACK.

[0011] To improve heat conduction and structural stability, both the main frame and the cover plate are made of metal.

[0012] Furthermore, the integrated water outlet valve is equipped with a temperature sensor, which transmits the temperature signal to the control center via a wireless transmission module.

[0013] To facilitate internal heat exchange, the gap between two adjacent heat pipes is 5-15mm, and the heat pipes are made of brass.

[0014] Furthermore, the liquid heat-conducting medium is water. Beneficial effects

[0015] By setting up thermal management devices between adjacent battery packs, and utilizing the synergistic effect of liquid thermal conductive medium and heat pipes, heat generated on the surface of each battery pack can be quickly and evenly dissipated under the condition of balanced charging of multiple battery packs. This achieves efficient and uniform heat dissipation, extends the service life of the battery pack, reduces the cost of battery replacement, and improves the economics of the energy storage system.

[0016] Meanwhile, a temperature sensor and wireless transmission module can be installed inside the integrated water outlet valve to feed back real-time temperature monitoring data of the battery pack, providing data support for the control center to intelligently regulate the thermal management system. For example, it can control the flow rate of the medium in the heat pipe, thereby further ensuring the safe and stable operation of the battery pack. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a stacked battery pack.

[0018] Figure 2 This is a schematic diagram of the structure at the reverse interface of a stacked battery pack;

[0019] Figure 3 An exploded view of a thermal management device;

[0020] Figure 4 This is a schematic diagram showing the connection between the cover plate and the main frame in the thermal management device;

[0021] Figure 5 This is a schematic diagram of the heat pipe installation;

[0022] Figure 6 This is a schematic diagram of heat dissipation in a single battery pack between two adjacent thermal management devices;

[0023] In the diagram: 1. Main frame 2. Battery PACK 3. Thermal management device 31. Main frame 32. Cover plate 33. Heat pipe 34. Integrated water inlet valve 35. Integrated water outlet valve 36. Intermediate partition. Detailed Implementation

[0024] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model. Example 1

[0025] In the energy storage battery pack of a certain energy storage power station, several thermal management devices 3 are set up in parallel. The thermal management device 3 is located between two adjacent battery PACK2. The thermal management device 3 includes a main frame 31 and a cover plate 32. The main frame 31 has an internal partition plate 36. The partition plate 36 isolates the internal cavity of the main frame 31 into two independent cavity structures. The two independent cavity structures are filled with liquid heat-conducting medium.

[0026] An integrated water inlet valve 34 and an integrated water outlet valve 35 are respectively provided on both sides of the intermediate partition 36. The integrated water inlet valve 34 and the integrated water outlet valve 35 are connected by a heat-conducting pipe 33, which is embedded in the heat-conducting medium.

[0027] During installation, ensure that a thermally conductive silicone layer is evenly applied to the contact surface between the thermal management device 3 and the battery PACK 2 to enhance heat conduction. Next, connect the integrated water inlet valve 34 and integrated water outlet valve 35 of each thermal management device 3 to allow the liquid to flow in the set direction, ensuring that the liquid flow direction in adjacent thermal management devices 3 is consistent.

[0028] During heat dissipation, heat is generated in battery PACK2 and conducted through the sidewalls to the heat-conducting medium in the independent cavity structure. The liquid flowing in the heat pipe 33 can carry away the heat in the heat-conducting medium, thereby keeping the heat-conducting medium at a low temperature and continuously and effectively dissipating the heat from battery PACK2 during charging.

[0029] like Figure 6 As shown, during use, based on the flow direction of the liquid medium, it can be known that when the thermal management devices on both the left and right sides of the battery pack are in working condition, that is, when the liquid flow mode is DCBA.

[0030] At this point, the temperatures, from lowest to highest, are DCBA. Therefore, the heat dissipation rate of D-D', C-C', B-B', and A-A' gradually decreases. However, for a single battery pack, there is still internal heat exchange between D'-A' and C'-D'. Combined with external heat exchange, uniform heat dissipation of the battery pack can be achieved. Example 2

[0031] A temperature sensor and a wireless transmission module are installed in the integrated outlet valve, and a flow rate control function is installed in the integrated inlet valve. The rest are the same as in Example 1.

[0032] During operation, the control center can monitor the temperature changes of each battery pack in real time through temperature sensors and wireless transmission modules. When the temperature of a battery pack in a certain area is found to be too high, the control center can increase the liquid flow in that area and enhance the heat dissipation effect by adjusting the integrated inlet and outlet valves of the corresponding thermal management device.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A thermal management system for rapid equalization charging of energy storage battery packs, characterized in that, It includes several thermal management devices connected in parallel, wherein the thermal management devices are located between two adjacent battery packs; The thermal management device includes a main frame and a cover plate. The main frame has an internal partition plate that separates the internal cavity of the main frame into two independent cavity structures. Both independent cavity structures are filled with a liquid heat-conducting medium. An integrated water inlet valve and an integrated water outlet valve are respectively provided on both sides of the middle partition. The integrated water inlet valve and the integrated water outlet valve are connected by a heat-conducting pipe, which is embedded in the heat-conducting medium.

2. The thermal management system for rapid equalization charging of energy storage battery packs according to claim 1, characterized in that... The liquid flow direction is the same in two adjacent thermal management devices.

3. The thermal management system for rapid equalization charging of energy storage battery packs according to claim 1 or 2, characterized in that... A thermally conductive silicone layer is provided on the contact surface between the thermal management device and the battery PACK.

4. The thermal management system for rapid equalization charging of energy storage battery packs according to claim 3, characterized in that... The main frame and cover plate are both made of metal.

5. The thermal management system for rapid equalization charging of energy storage battery packs according to claim 3, characterized in that... The integrated water outlet valve is equipped with a temperature sensor, which transmits the temperature signal to the control center via a wireless transmission module.

6. The thermal management system for rapid equalization charging of energy storage battery packs according to claim 3, characterized in that... The gap between two adjacent heat pipes is 5-15mm, and the heat pipes are made of brass.

7. The thermal management system for rapid equalization charging of energy storage battery packs according to claim 3, characterized in that... The liquid heat-conducting medium is water.

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