Cooling structure of liquid-cooled battery pack

Abstract

The utility model relates to the technical field of battery heat dissipation, and discloses a liquid-cooled battery pack heat dissipation structure, which comprises a liquid-cooled battery pack and a total current controller, the liquid-cooled battery pack comprises a liquid-cooled plate and a plurality of battery monomers arranged on the liquid-cooled plate, a liquid-cooled pipeline is arranged in the liquid-cooled plate, and the total current controller is arranged in the liquid-cooled pipeline. A liquid cooling plate inlet and a liquid cooling plate outlet are formed in one end, close to the total current controller, of the liquid cooling plate; a heat dissipation plate is arranged at the bottom of the total current controller, a heat dissipation pipeline is arranged in the heat dissipation plate, the heat dissipation plate is provided with a heat dissipation plate inlet and a heat dissipation plate outlet, and the heat dissipation plate inlet is communicated with the liquid cooling plate outlet through a connecting pipeline; and the liquid cooling plate inlet and the heat dissipation plate outlet are respectively connected with an external liquid cooling unit to form a liquid cooling medium circulating pipeline. According to the utility model, the heat dissipation efficiency can be improved, the battery temperature in the battery pack and the temperature of power electronic devices in the controller are effectively controlled, the influence of heating of the power electronic devices on the battery temperature in the battery pack is avoided, and the stable work of the battery pack is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery heat dissipation technology, and in particular to a liquid-cooled battery pack heat dissipation structure. Background Technology

[0002] With the continuous development of new energy technologies, electrochemical energy storage stations are being used more and more widely in power systems. Energy storage provides an important guarantee for the stable and continuous output of energy and is an inevitable choice for the upgrading and supporting of new energy power generation. Liquid-cooled battery packs are the core component of liquid-cooled electrochemical energy storage. Several battery packs are electrically and structurally connected to form a cluster, and several battery clusters are electrically and structurally connected to form an energy storage system. Currently, energy storage systems face the following problems:

[0003] 1) During the energy exchange process of charging and discharging, the battery module consumes electrical energy and generates a lot of heat. The batteries in the energy storage system are densely arranged and the container environment is relatively closed, which makes it easy for battery heat to accumulate and cause excessive temperature rise, affecting battery life and safety.

[0004] 2) To improve safety, a full-current controller is used to control the output voltage and output current of the liquid-cooled battery pack. The power electronic devices inside the full-current controller generate heat when performing conversion control, and an effective heat dissipation structure is also required for temperature control.

[0005] 3) Battery operating temperature directly affects battery life and safety. The optimal operating temperature range for a battery is generally 15℃-35℃, while the temperature of the main heat-generating components of the full current controller can reach around 100℃. Due to the significant difference in temperature control, the heat from the full current controller cannot affect the battery temperature. If the temperatures of the battery and the heat-generating components of the full current controller are controlled within the same range, the cost of the heat dissipation structure will be greatly increased.

[0006] Therefore, optimizing the heat dissipation structure of battery modules has become an important research topic in this field. Utility Model Content

[0007] The purpose of this invention is to provide a liquid-cooled battery pack heat dissipation structure that improves heat dissipation efficiency, effectively reduces the temperature of the battery inside the battery pack and the temperature of the power electronic devices inside the controller, and avoids the impact of the heat generated by the power electronic devices on the temperature of the battery inside the battery pack, thereby ensuring the stable operation of the battery pack.

[0008] To achieve the above objectives, this utility model provides the following solution:

[0009] A liquid-cooled battery pack heat dissipation structure is provided. The front end of the liquid-cooled battery pack is provided with a full current controller. The liquid-cooled battery pack includes a liquid cooling plate and a plurality of battery cells arranged in a matrix on the liquid cooling plate. The liquid cooling plate is provided with liquid cooling pipes inside. The end of the liquid cooling plate near the full current controller is provided with a liquid cooling plate inlet and a liquid cooling plate outlet that are connected to the liquid cooling pipes.

[0010] The bottom of the full current controller is provided with a heat sink plate, and heat dissipation pipes are arranged inside the heat sink plate. The two ends of the heat sink plate are respectively provided with a heat sink plate inlet and a heat sink plate outlet connected to the heat dissipation pipes. The heat sink plate inlet and the liquid cooling plate outlet are connected by a connecting pipe.

[0011] The inlet of the liquid cooling plate is connected to the outlet of the external liquid cooling unit, and the outlet of the heat dissipation plate is connected to the return port of the liquid cooling unit, forming a liquid cooling medium circulation pipeline.

[0012] Furthermore, the outer cover of the full current controller is provided with a full current controller housing, and the full current controller housing is provided with multiple heat dissipation holes.

[0013] Furthermore, the power electronic devices of the full current controller are disposed above the heat sink.

[0014] Furthermore, the full current controller is provided with a control board electrically connected to the power electronic device.

[0015] Furthermore, a battery pack cover is provided on top of the liquid-cooled battery pack.

[0016] Furthermore, multiple battery cells are cascaded together and connected to the full-current controller via wires, which are disposed within wire slots.

[0017] According to the specific embodiments provided by this utility model, the liquid-cooled battery pack heat dissipation structure provided by this utility model discloses the following technical effects:

[0018] A full-current controller is installed at the front end of the liquid-cooled battery pack. This controller can control the output voltage and current of the liquid-cooled battery pack, improving its operational safety. The liquid-cooled battery pack uses a liquid cooling plate at the bottom to dissipate heat from the individual battery cells, while the full-current controller has a heat sink at its bottom. The power electronic heating devices inside the full-current controller are cooled through the heat sink. The liquid cooling plate and the heat sink are connected by a pipeline. The low-temperature coolant provided by the external liquid cooling unit first passes through the liquid cooling plate to remove heat from the individual battery cells, and then circulates to the heat sink to remove heat from the power electronic heating devices inside the full-current controller. This heat dissipation sequence ensures effective heat dissipation while avoiding the impact of a high full-current controller temperature on the battery pack's heat dissipation. Furthermore, the heat sink has a simple structure, small size, and high heat dissipation efficiency. This heat dissipation structure can simultaneously meet the different heat dissipation temperature requirements of the individual battery cells and the power electronic devices of the full-current controller, and the heat generated by the power electronic devices does not affect the battery temperature. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the front view of the heat dissipation structure of the liquid-cooled battery pack according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the liquid-cooled battery pack according to an embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the assembly structure of the liquid cooling plate and the heat sink in an embodiment of this utility model;

[0023] Figure 4 This is a partial schematic diagram of the connecting pipes between the liquid cooling plate and the heat sink in an embodiment of the present invention;

[0024] Figure 5 This is a top view of the connecting pipe between the liquid cooling plate and the heat sink in an embodiment of this utility model.

[0025] Explanation of reference numerals in the attached diagram: 1. Liquid-cooled battery pack; 2. Full-current controller; 3. Liquid-cooled plate; 4. Battery pack cover; 5. Full-current controller housing; 6. Battery cell; 7. Cable tray; 8. Liquid-cooled plate inlet; 9. Heat sink outlet; 10. Control board; 11. Heat sink; 12. Liquid-cooled plate outlet; 13. Heat sink inlet; 14. Connecting pipe. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] In this patent description, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "center," "longitudinal," "transverse," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0028] The purpose of this invention is to provide a liquid-cooled battery pack heat dissipation structure that improves heat dissipation efficiency, effectively controls the battery temperature inside the battery pack and the temperature of the power electronic devices inside the controller, and avoids the impact of the heat generated by the power electronic devices on the battery temperature inside the battery pack, thereby ensuring the stable operation of the battery pack.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1-5 As shown, the liquid-cooled battery pack heat dissipation structure provided by this utility model includes a full-current controller 2 at the front end of the liquid-cooled battery pack 1. The liquid-cooled battery pack 1 includes a liquid-cooling plate 3 and a plurality of battery cells 6 arranged in a matrix on the liquid-cooling plate 3. Liquid-cooling pipes are arranged inside the liquid-cooling plate 3. The end of the liquid-cooling plate 3 near the full-current controller 2 has a liquid-cooling plate inlet 8 and a liquid-cooling plate outlet 12 communicating with the liquid-cooling pipes. The liquid-cooling plate inlet 8 is the liquid inlet of the liquid-cooling pipes, and the liquid-cooling plate outlet 12 is the liquid outlet of the liquid-cooling pipes. For example, the liquid-cooling pipes are arranged in a serpentine manner, such as... Figure 5 As shown, or coiled in a spiral shape, it is used to increase the contact area between the liquid cooling pipes and the battery cells 6 and improve the heat dissipation effect; the battery cells in the liquid-cooled battery pack are cooled by the bottom liquid cooling plate 3, and the heat of the battery cells is carried away by the coolant inside the liquid cooling pipes.

[0031] The bottom of the full current controller 2 is provided with a heat sink 11, and heat dissipation pipes are arranged inside the heat sink 11. The two ends of the heat sink 11 are respectively provided with a heat sink inlet 13 and a heat sink outlet 9 that are connected to the heat dissipation pipes. The heat sink inlet 13 is connected to the liquid cooling plate outlet 12 through a connecting pipe 14. The heat sink inlet 13 is the liquid inlet of the heat dissipation pipe, and the heat sink outlet 9 is the liquid outlet of the heat dissipation pipe.

[0032] The liquid cooling plate inlet 8 and the heat dissipation plate outlet 9 are respectively connected to an external liquid cooling unit to form a liquid cooling medium circulation pipeline. Specifically, the liquid cooling plate inlet 8 is connected to the liquid outlet of the liquid cooling unit, and the heat dissipation plate outlet 9 is connected to the liquid return port of the liquid cooling unit.

[0033] The low-temperature cooling water from the external liquid cooling unit first enters the liquid cooling pipes in the liquid cooling plate 3 at the bottom of the battery cell in the liquid-cooled battery pack through the liquid cooling plate inlet 8. After carrying away the battery heat, it enters the heat dissipation pipes in the heat dissipation plate 11 through the heat dissipation plate inlet 13. It then carries away the heat from the main heat-generating power electronic components of the full current controller 2, and finally flows out from the heat dissipation plate outlet 9.

[0034] Since the temperature of the battery pack is lower than that of the heat-generating power electronic components inside the full-current controller, the heat dissipation structure provides a heat dissipation sequence that effectively ensures that the individual battery cells in the liquid-cooled battery pack are cooled first, and then the higher-temperature full-current controller is cooled. This avoids the influence of the full-current controller on the heat dissipation of the liquid-cooled battery pack, makes full use of the liquid cooling medium, achieves step-by-step heat dissipation, and ensures the heat dissipation effect of the entire structure.

[0035] The full current controller 2 is covered by a full current controller housing 5, which has multiple heat dissipation holes to further improve the heat dissipation effect of the full current controller.

[0036] The power electronic components of the full-current controller 2 are disposed above the heat sink 11. Specifically, the power electronic components that generate a lot of heat are disposed on the upper surface of the heat sink 11 to facilitate heat dissipation.

[0037] The full-current controller 2 is provided with a control board 10 electrically connected to the power electronic device. The specific structure of the full-current controller 2 can be referred to in several patents previously filed by the applicant (e.g., CN116581350A - A liquid-cooled battery pack with full-current control and its design method), and will not be described in detail here.

[0038] The liquid-cooled battery pack 1 is covered by a battery pack cover 4. Multiple reinforcing ribs in the width direction can be provided on the battery pack cover 4 to improve its strength. The battery pack cover 4 has a protection rating of IP67 or higher.

[0039] Multiple battery cells 6 are cascaded together and connected to the full-current controller 2 via wires, which are arranged within wire channels 7. The wire channels 7 can be positioned between adjacent rows of battery cells 6, providing a centralized and orderly path for power lines, signal lines, and other connecting wires. This not only reduces wiring clutter but also ensures good protection for the wires.

[0040] The liquid-cooled battery pack heat dissipation structure provided by this utility model, compared with the existing conventional liquid-cooled battery pack structure, adds a full-current controller in front of the liquid-cooled battery pack. The full-current controller controls the output voltage and output current of each liquid-cooled battery pack, improving the safety of the energy storage system. The main heat-generating power electronic components of the full-current controller are cooled by a heat sink. Compared with other conventional heat dissipation methods, the heat sink structure is small in size, has high heat dissipation efficiency, and effectively controls the temperature of the heat-generating power electronic components. The heat dissipation pipes in the heat sink are connected in series with the liquid cooling pipes of the liquid-cooled plate at the bottom of the battery pack. An external liquid cooling unit provides low-temperature cooling water to first remove the heat from the individual battery cells, and then, through the heat sink, remove the heat from the main heat-generating components of the full-current controller. The heat dissipation of the full-current controller does not affect the heat dissipation of the battery, thus effectively utilizing the liquid cooling medium to improve heat dissipation efficiency.

[0041] This document uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this utility model. Furthermore, those skilled in the art will recognize that, based on the ideas of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A liquid-cooled battery pack heat dissipation structure, wherein a full-current controller (2) is provided at the front end of the liquid-cooled battery pack (1), characterized in that, The liquid-cooled battery pack (1) includes a liquid-cooled plate (3) and a number of battery cells (6) arranged in a matrix on the liquid-cooled plate (3). The liquid-cooled plate (3) is provided with liquid-cooled pipes inside. The liquid-cooled plate (3) is provided with a liquid-cooled plate inlet (8) and a liquid-cooled plate outlet (12) connected to the liquid-cooled pipes at one end of the liquid-cooled plate (3) near the full current controller (2). The bottom of the full current controller (2) is provided with a heat sink (11), and the heat sink (11) is provided with heat dissipation pipes. The two ends of the heat sink (11) are respectively provided with a heat sink inlet (13) and a heat sink outlet (9) connected to the heat dissipation pipes. The heat sink inlet (13) and the liquid cooling plate outlet (12) are connected by a connecting pipe (14). The liquid cooling plate inlet (8) is connected to the liquid outlet of the external liquid cooling unit, and the heat dissipation plate outlet (9) is connected to the liquid return port of the liquid cooling unit, forming a liquid cooling medium circulation pipeline.

2. The liquid-cooled battery pack heat dissipation structure according to claim 1, characterized in that, The full current controller (2) is covered by a full current controller housing (5), and the full current controller housing (5) is provided with multiple heat dissipation holes.

3. The liquid-cooled battery pack heat dissipation structure according to claim 1, characterized in that, The power electronic components of the full current controller (2) are disposed above the heat sink (11).

4. The liquid-cooled battery pack heat dissipation structure according to claim 3, characterized in that, The full current controller (2) is provided with a control board (10) electrically connected to the power electronic device.

5. The liquid-cooled battery pack heat dissipation structure according to claim 1, characterized in that, The liquid-cooled battery pack (1) is covered with a battery pack cover (4).

6. The liquid-cooled battery pack heat dissipation structure according to claim 4, characterized in that, Multiple battery cells (6) are cascaded together and connected to the full current controller (2) via wires, which are disposed in a wire groove (7).

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