Energy storage battery pack combined with semiconductor chilling plate for refined temperature control

Abstract

The utility model discloses an energy storage battery pack combined with semiconductor chilling plates for refined temperature control, which comprises a plurality of battery cells, a bottom liquid cooling tray and an upper cover fixedly connected with the bottom liquid cooling tray, the bottom liquid cooling tray is arranged at the bottoms of the battery cells, the semiconductor chilling plates are arranged at the tops of the battery cells, and the semiconductor chilling plates are fixedly connected with the upper cover. A top liquid cooling plate is arranged at the tops of the plurality of semiconductor chilling plates, each battery cell is connected with the intelligent thermal management system, and the plurality of semiconductor chilling plates, the top liquid cooling plate and the intelligent thermal management system are all arranged on the inner side of the upper cover; and the battery cells are connected with each other and are connected with a positive wire and a negative wire. According to the utility model, the semiconductor chilling plate is combined with the top liquid cooling plate, so that the temperature and temperature difference of local batteries can be controlled more flexibly and effectively. The mode that the batteries are simultaneously cooled / heated by the bottom and the top can increase the cooling / heating power, the up-down temperature difference of the batteries can be reduced, and meanwhile the temperature difference between the solid batteries can be finely controlled.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of energy storage battery pack in combination with semiconductor refrigeration sheet fine temperature control, belong to battery energy storage technical field. BACKGROUND

[0002] Battery box has a pivotal position in the new energy storage field. With the popularity of renewable energy and the increasing demand for grid stability, energy storage battery systems have become a key technology for balancing supply and demand and optimizing energy utilization. However, the efficient operation of energy storage battery systems depends on multiple factors, with temperature management being particularly important. Energy storage batteries, whether lithium-ion batteries, sodium-sulfur batteries, or other types, are significantly affected by temperature in terms of performance and lifespan. Temperature consistency refers to the temperature differences between individual battery cells in a battery pack. Ideally, all battery cells should be maintained within the same temperature range to ensure that they age at the same rate and provide consistent performance.

[0003] The current deficiencies are as follows:

[0004] Inconsistent temperature and temperature difference can lead to performance differences between battery cells. Batteries at high temperatures may reach their capacity limit faster, while batteries at low temperatures may not be able to fully utilize their capacity. This performance inconsistency can affect the output power and energy efficiency of the entire battery pack. If certain battery cells are in this state for a long time, their lifespan will be significantly shortened, which in turn affects the lifespan of the entire battery pack.

[0005] In addition to the temperature differences between battery cells, there are also temperature consistency issues with the battery cells themselves when they are in different cooling environments. For energy storage batteries, large local temperature differences also lead to capacity degradation.

[0006] Energy storage battery systems typically contain hundreds or even thousands of battery cells, requiring more efficient management of the uniform distribution and heat management of these batteries.

[0007] The current mainstream solution for battery temperature and temperature difference is to cool the bottom of the battery. However, this solution has the following shortcomings: due to the low thermal conductivity of the physical properties of the battery itself, the temperature difference between the single cooling method far from the cold plate and the temperature difference near the cold plate is large, and there is a certain degree of temperature difference between the battery temperature near the inlet and the battery temperature near the outlet.

[0008] For a small number of top liquid cooling solutions, there is also a risk of insulation reliability at the pole position. This application also has various concerns. SUMMARY

[0009] The technical problem to be solved by the utility model is how to individually and accurately control the temperature of each battery cell in an energy storage battery.

[0010] In order to solve the above technical problems, the technical scheme of the utility model provides a kind of energy storage battery pack combined with fine temperature control of semiconductor refrigeration piece, including multiple electric core, the bottom liquid cooling tray of electric core bottom heat dissipation and the upper cover being covered in multiple electric core and being fixedly connected with bottom liquid cooling tray, bottom liquid cooling tray is located in the bottom of multiple electric core, its characterized in that, the top of multiple electric core is equipped with the multiple semiconductor refrigeration piece of electric core top heat dissipation, the top of multiple semiconductor refrigeration piece is equipped with top liquid cooling plate, each electric core is connected with intelligent thermal management system that monitors the temperature of each electric core and the temperature difference between electric core to control the refrigeration or heating degree of semiconductor refrigeration piece, and multiple semiconductor refrigeration pieces, top liquid cooling plate, intelligent thermal management system are all arranged in the inner side of upper cover;Each semiconductor refrigeration piece is connected and connected with positive line and negative line.

[0011] Preferably, each semiconductor refrigeration piece and electric core top are connected by insulating heat conducting layer.

[0012] Preferably, the insulating heat conducting layer is heat-conducting silica gel insulating sheet.

[0013] Preferably, all semiconductor refrigeration pieces and top liquid cooling plate are connected by heat-conducting glue.

[0014] Preferably, the intelligent thermal management system is battery management system, which is used for collecting detected electric core temperature and temperature difference between electric core, and controlling the power of corresponding position semiconductor refrigeration piece, so as to control the temperature of each electric core and the uniformity of electric core temperature.

[0015] Preferably, when the current flowing through the semiconductor refrigeration piece flows in one direction, the semiconductor refrigeration piece refrigerates; when the current flowing through the semiconductor refrigeration piece flows in another direction, the semiconductor refrigeration piece heats up.

[0016] Preferably, by changing the current size of the semiconductor refrigeration piece, the refrigeration capacity or heating capacity of the semiconductor refrigeration piece is adjusted.

[0017] Preferably, multiple electric cores are arranged in a rectangular structure as a whole.

[0018] Preferably, multiple semiconductor refrigeration pieces are laid on the top of multiple electric cores.

[0019] Preferably, the top liquid cooling plate is a cold pipe.

[0020] The utility model discloses a kind of combination of liquid cooling plate and semiconductor cooling, introduce into energy storage battery system;Compared with the simple top liquid cooling plate heat dissipation of battery, the utility model can more flexible and effective control local battery temperature and temperature difference by the way of combination of semiconductor refrigerating sheet and top liquid cooling plate.It can increase heat dissipation / heating power by the way of battery is simultaneously radiated / heated by bottom and top, can reduce the temperature difference of battery, and meanwhile, the fine control of temperature difference between solid battery can be realized. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is an external schematic diagram of a kind of energy storage battery pack combined with semiconductor refrigerating sheet fine temperature control;

[0022] Figure 2 It is an internal schematic diagram of a kind of energy storage battery pack combined with semiconductor refrigerating sheet fine temperature control. DETAILED DESCRIPTION

[0023] To make the utility model more obvious and easy to understand, with preferred embodiment, and cooperate with the drawings, detailed description is as follows.

[0024] The utility model provides a kind of energy storage battery pack combined with semiconductor refrigerating sheet fine temperature control, as shown in Figure 1 、 Figure 2 In the top of battery, multiple module semiconductor refrigerating sheet 1 is combined with top liquid cooling plate 2 (in the embodiment, top liquid cooling plate 2 is cold pipe) to realize the heat dissipation / heating of battery top, while the bottom of battery has bottom liquid cooling tray 4, bottom liquid cooling tray 4 also radiates / heat simultaneously to battery bottom, and carries out main heat dissipation / heating.Top semiconductor refrigerating sheet 1 is composed of multiple modules, and each module corresponds to different area battery cell 3 respectively, so that battery can be zoned controlled.Among them, there is semiconductor refrigerating sheet 1 on the top of battery to radiate the top of battery;There is top liquid cooling plate 2 on the top of semiconductor refrigerating sheet 1, and it radiates.

[0025] By adding insulating heat-conducting material between battery monomer and refrigerator, local heat can be quickly transferred, and the risk of local temperature rise can be reduced;Semiconductor refrigerating sheet 1 exchanges heat with battery cell 3 through insulating heat-conducting material (for example, heat-conducting silicone insulating sheet) on one side, and exchanges heat with top liquid cooling plate 2 on the other side through heat-conducting adhesive.

[0026] The intelligent thermal management system 5 based on sensors and algorithms can monitor the temperature of the battery monomers (i.e. the battery cells 3) in real time and adjust the cooling strategy as needed. The intelligent thermal management system 5 can dynamically respond to the thermal state of the battery pack, improve temperature consistency; in this embodiment, the intelligent thermal management system 5 is a battery management system (BMS), and the specific way is that the BMS collects the detected temperature of the battery cells 3 and the temperature difference between the battery cells 3, and controls the power of the corresponding position refrigerators, to achieve the purpose of fine control of battery temperature and battery temperature uniformity. These technologies can more accurately control the temperature of the battery monomers, reduce the temperature difference between the batteries, and dynamically respond to the thermal state of the battery pack.

[0027] Improved management strategy of battery management system (BMS): by improving the algorithm and hardware of BMS, the temperature of the battery pack can be more effectively managed. The semiconductor refrigerating sheet 1 is based on the Peltier effect, that is, to create cold through the thermoelectric effect of the semiconductor. By controlling the size and direction of the current, the effects of refrigeration and heating can be achieved. By changing the current size of the semiconductor refrigerating sheet 1, the refrigerating capacity of the semiconductor refrigerating sheet 1 can be adjusted. When the temperature of the batteries in some areas is not uniform, by controlling the current of the semiconductor refrigerating sheet 1 in the corresponding position, the refrigerating capacity of the corresponding position is controlled, and the temperature of the battery in the corresponding position is adjusted. That is, when the current increases, the refrigerating capacity of the semiconductor refrigerating sheet 1 also increases, and vice versa. This method is simple, direct and easy to implement.

[0028] Among them, a plurality of battery cells 3 are arranged in a rectangular structure; a plurality of semiconductor refrigerating sheets 1 are laid on the top of a plurality of battery cells 3. The upper cover 8 covers a plurality of battery cells 3 and is fixedly connected with the bottom liquid cooling tray 4, each battery cell 3 is connected with the intelligent thermal management system 5 for monitoring the temperature of each battery cell 3 in real time, and the plurality of semiconductor refrigerating sheets 1, the top liquid cooling plate 2 and the intelligent thermal management system 5 are arranged on the inner side of the upper cover 8; each semiconductor refrigerating sheet 1 is connected with each other and connected with the positive line 6 and the negative line 7.

[0029] Through the combination of the top liquid cooling plate 2 and the semiconductor cooling (i.e. the semiconductor refrigerating sheet 1), that is, the role of the top liquid cooling plate 2, the heat / cold of one end of the refrigerator is helped to be taken out of the package in time to ensure the efficiency and needs of the refrigerator. The combination of the refrigerator (i.e. the semiconductor refrigerating sheet 1) and the liquid cooling plate (i.e. the top liquid cooling plate 2) has higher efficiency than the conventional fan cooling or fin natural cooling.

[0030] The above-mentioned thermal management scheme for energy storage batteries can more flexibly and effectively control the battery temperature and temperature difference within a more ideal range to enhance the cycle life and capacity performance of the batteries.

Claims

1. An energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheets, comprising a plurality of battery cells (3), a bottom liquid cooling tray (4) for dissipating heat from the bottom of the battery cells (3), and an upper cover (8) covering the plurality of battery cells (3) and fixedly connected with the bottom liquid cooling tray (4), the bottom liquid cooling tray (4) being arranged at the bottom of the plurality of battery cells (3), characterized in that, The top of the plurality of battery cells (3) is provided with a plurality of semiconductor refrigerating fins (1) for dissipating heat from the top of the battery cells (3), and the top of the plurality of semiconductor refrigerating fins (1) is provided with a top liquid cooling plate (2), each battery cell (3) is connected with an intelligent thermal management system (5) for monitoring the temperature of each battery cell (3) and the temperature difference between the battery cells (3) in real time, thereby controlling the refrigeration or heating degree of the semiconductor refrigerating fin (1), and the plurality of semiconductor refrigerating fins (1), the top liquid cooling plate (2) and the intelligent thermal management system (5) are arranged inside the upper cover (8); each semiconductor refrigerating fin (1) is connected with each other and connected with the positive line (6) and the negative line (7).

2. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 1, characterized in that, Each of the semiconductor refrigerating fins (1) is connected with the top of the battery cell (3) through an insulating heat conducting layer.

3. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 2, characterized in that, The insulating heat conducting layer is a heat conducting silica gel insulating sheet.

4. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 1, characterized in that, All of the semiconductor refrigerating fins (1) are connected with the top liquid cooling plate (2) through a heat conducting adhesive.

5. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 1, characterized in that, The intelligent thermal management system (5) is a battery management system, which is used for collecting the detected temperature of the battery cells (3) and the temperature difference between the battery cells (3), and simultaneously controlling the power of the corresponding semiconductor refrigerating fin (1), thereby controlling the temperature of each battery cell (3) and the uniformity of the temperature of the battery cells (3).

6. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 1 or 5, characterized in that, When the current flowing through the semiconductor refrigerating fin (1) flows in one direction, the semiconductor refrigerating fin (1) refrigerates; when the current flowing through the semiconductor refrigerating fin (1) flows in the other direction, the semiconductor refrigerating fin (1) heats.

7. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 6, characterized in that, By changing the current size of the semiconductor refrigerating fin (1), the refrigeration or heating capacity of the semiconductor refrigerating fin (1) is adjusted.

8. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 1, characterized in that, The plurality of battery cells (3) are arranged in a rectangular structure as a whole.

9. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 8, characterized in that, The plurality of semiconductor refrigerating fins (1) are laid on the top of the plurality of battery cells (3).

10. The energy storage battery pack combined with fine temperature control of semiconductor refrigeration sheet according to claim 1, characterized in that, The top liquid cooling plate (2) is a cold pipe.

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