Integrated energy storage converter heat dissipation system and centralized energy storage heat dissipation system

Abstract

The utility model provides an integrated energy storage converter heat radiation system, comprising an energy storage converter comprising a plurality of IGBT modules, an electrical member and a liquid cooling plate, the plurality of IGBT modules are distributed on the liquid cooling plate to complete heat radiation, and the electrical member completes heat radiation through a liquid cooling heat exchanger or a fan; the energy storage system liquid cooling unit provides a liquid cooling flow channel and completes heat exchange externally; and a liquid cooling plate of the energy storage converter is connected into the liquid cooling flow channel. According to the utility model, the energy storage converter adopts a wind-liquid cooling mixed heat dissipation mode, so that the series connection of the liquid cooling pipelines is realized, and the heat dissipation of the IGBT module and other heat dissipation devices in the energy storage converter is completed. Meanwhile, a heat dissipation flow channel of the energy storage converter is connected with a battery module liquid cooling plate in parallel, a centralized heat dissipation mode of the energy storage system is achieved, liquid cooling units such as an independent liquid cooling heat dissipation fan of the energy storage converter are reduced, the cost is greatly reduced, the energy consumption is reduced, and the system efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of energy storage, and in particular to an integrated energy storage converter heat dissipation system and a centralized energy storage heat dissipation system. Background Technology

[0002] One of the four core components of new energy storage is the PCS (Power Conversion System), which controls the charging and discharging process of batteries, converting AC to DC power, and can directly supply power to AC loads in the absence of a power grid. It features high efficiency, fast response, high reliability, and strong flexibility.

[0003] The core component of the PCS is the DC / AC bidirectional converter, which is also a critical heat source. Therefore, effective heat dissipation management for this heat source is a key technology. Conventional energy storage converter power modules typically use air cooling, which occupies a large volume and has low heat exchange efficiency. Therefore, conventional three-phase AC systems generally use one heat dissipation module per phase, requiring three sets of heat dissipation modules and three sets of cooling air ducts. The air duct design is complex, and ensuring airtightness results in high manufacturing costs.

[0004] Meanwhile, some liquid cooling solutions employ a single water-cooled plate for all three-phase IGBT modules. In this solution, all IGBT heating elements are mounted on a single side of the water-cooled plate, resulting in a large overall plate size and consequently, a large cabinet. The water-cooled plate also has relatively low heat dissipation efficiency and requires a large water flow rate. Utility Model Content

[0005] To address the problems existing in the prior art, an integrated energy storage converter heat dissipation system and a centralized energy storage heat dissipation system are provided to solve the heat dissipation problem of the core IGBT module of the PCS energy storage converter.

[0006] The first aspect of this utility model proposes an integrated energy storage converter heat dissipation system, comprising:

[0007] The energy storage converter includes multiple IGBT modules, electrical components, and a liquid cooling plate. The multiple IGBT modules are distributed on the liquid cooling plate for heat dissipation, and the electrical components are cooled by a liquid cooling heat exchanger or a fan.

[0008] The energy storage system liquid cooling unit provides a liquid cooling channel and completes heat exchange externally; the liquid cooling plate of the energy storage converter is connected to the liquid cooling channel.

[0009] As a preferred embodiment, the multiple IGBT modules are distributed on both sides of the liquid cooling plate, and the IGBT modules on the first side of the liquid cooling plate are electrically connected to the IGBT modules on the second side of the liquid cooling plate through a stacked copper busbar.

[0010] As a preferred embodiment, the liquid cooling plate has a through hole in the middle, which is used to install the stacked copper busbar to realize the electrical connection between the IGBT modules on the first and second sides of the liquid cooling plate.

[0011] As a preferred embodiment, the liquid cooling plate includes a double-layer liquid cooling channel, which is interconnected by a through hole; wherein the inlet of the liquid cooling plate is connected to the liquid cooling channel on the second side, and the outlet of the liquid cooling plate is connected to the liquid cooling channel on the first side.

[0012] As a preferred embodiment, the number of IGBT modules disposed on the second side of the liquid cooling plate is greater than the number of IGBT modules disposed on the first side of the liquid cooling plate.

[0013] As a preferred embodiment, an AC-side IGBT module is mounted on the first side of the liquid cooling plate, and a DC-side IGBT module is mounted on the second side of the liquid cooling plate.

[0014] As a preferred embodiment, the inlet and outlet of the liquid cooling plate are both located above the liquid cooling plate.

[0015] As a preferred embodiment, both the inlet and outlet of the liquid cooling plate are implemented using standard quick-connect interfaces.

[0016] As a preferred embodiment, when the electrical components are cooled by a liquid-cooled heat exchanger, the liquid-cooled heat exchanger is connected in series in the liquid-cooled pipes connected by the liquid-cooled plate; wherein, the electrical components include circuit breakers, copper busbars, reactors, transformers and large capacitors.

[0017] The second aspect of this utility model proposes a centralized energy storage and heat dissipation system, comprising:

[0018] The integrated energy storage converter cooling system described in the first aspect;

[0019] The battery pack includes a liquid cooling plate for heat dissipation, the liquid cooling plate being connected in parallel to a liquid cooling channel provided by a liquid cooling unit in the energy storage system.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1. In the energy storage converter, a liquid cooling plate design with a double-layer liquid cooling channel is adopted to effectively reduce the temperature difference between the two IGBT modules.

[0022] 2. The liquid cooling plate features a double-layer design, converging the inlet and outlet in one place, which facilitates the manufacturing and integration of pipelines.

[0023] 3. The energy storage inverter adopts a hybrid heat dissipation mode. The liquid cooling plate directly exchanges heat to the IGBT module, while the heat sink plus fan air cooling mode dissipates heat to the internal electrical components of the energy storage inverter, such as circuit breakers, copper busbars, reactors, transformers, and large capacitors.

[0024] 4. The energy storage converter adopts a hybrid air-liquid cooling mode, realizing the series connection of liquid cooling pipes to complete the heat dissipation of the IGBT module and other heat dissipation devices inside the energy storage converter.

[0025] 5. The heat dissipation channel of the energy storage converter is connected in parallel to the liquid cooling plate of the battery module to realize the centralized heat dissipation mode of the energy storage system, reduce the need for independent liquid cooling fans and other liquid cooling units for the energy storage converter, and greatly reduce costs, reduce energy consumption and improve system efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the integrated energy storage converter heat dissipation system proposed in this utility model.

[0027] Figure 2 This is a schematic diagram of a liquid cooling plate in one embodiment of the present invention.

[0028] Figure 3 This is a top cross-sectional view of the liquid cooling plate in one embodiment of the present invention.

[0029] Figure 4 This is a front cross-sectional view of the liquid cooling plate in one embodiment of the present invention.

[0030] Figure 5 This is a schematic diagram of IGBT installation in one embodiment of the present invention.

[0031] Figure 6 This is a schematic diagram of the centralized energy storage and heat dissipation system proposed in this utility model.

[0032] Reference numerals: 1-Liquid cooling plate, 2-Water inlet, 3-Water outlet, 4-Drain outlet, 5-IGBT module, 6-Laminated copper busbar, 7-AC side copper busbar, 8-DC side laminated copper busbar, 9-IGBT driver board. Detailed Implementation

[0033] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0034] The heat generated by the IGBT module during operation is the largest heat source in the entire device. Effectively dissipating the heat generated by the IGBT module is the biggest technical challenge in heat dissipation of energy storage converters. Based on this, this utility model proposes an integrated energy storage converter heat dissipation system. By improving the heat dissipation method inside the PCS, the heat dissipation efficiency of the power module can be effectively improved, the overall energy consumption of the device can be reduced, and the size of the power module can be reduced.

[0035] Please refer to Figure 1 The integrated energy storage converter cooling system includes an energy storage converter and an energy storage system liquid cooling unit.

[0036] Specifically, the energy storage converter includes multiple IGBT modules 5, electrical components, and a liquid cooling plate 1. The multiple IGBT modules 5 are distributed on the liquid cooling plate 1 to complete heat dissipation, while the electrical components are cooled by liquid cooling heat exchangers or fans. Adjusting the heat dissipation methods of the IGBT modules 5 and the electrical components can effectively improve the heat dissipation efficiency of the power module.

[0037] The liquid cooling unit in the energy storage system is mainly used to provide the liquid cooling channels and complete the external heat exchange. The liquid cooling plate 1 of the energy storage converter is connected to the liquid cooling channels. It should be noted that the liquid cooling unit in the energy storage system can be set up independently, or it can directly use the liquid cooling unit provided by the entire energy storage system.

[0038] In practical applications, the electrical components of an energy storage converter include circuit breakers, copper busbars, reactors, transformers, and large capacitors, etc. Their composition is not the focus of this invention and will not be elaborated upon here. The electrical components of the energy storage converter can be cooled by a fan installed in the energy storage converter, or by a liquid-cooled heat exchanger. When using a liquid-cooled heat exchanger, the heat exchanger is connected in series in the liquid-cooled flow channel connected to the liquid-cooled plate 1 in the energy storage converter.

[0039] The heat dissipation setup in this embodiment allows for the use of a single liquid-cooled flow channel system. A liquid-cooled heat exchanger can be connected in series within the liquid-cooled flow channel to dissipate heat from other heat sources in the PCS, such as capacitors and copper busbars. This significantly improves the overall heat dissipation efficiency of the equipment and saves overall space. Connecting the liquid-cooled flow channel of the PCS to the liquid-cooled flow channel of the energy storage system also enables a centralized heat dissipation system. Similar to centralized heating systems in northern regions, this reduces the overall energy consumption of the energy storage system and improves its energy efficiency.

[0040] To save internal space in the PCS and improve the heat dissipation efficiency of the IGBT module 5, this embodiment features a special design for the installation method of the IGBT module 5 and the liquid cooling plate 1. For details, please refer to... Figure 2 , Figure 3 , Figure 4The liquid cooling plate 1 has a double-layer liquid cooling water channel inside, separated by a baffle plate with a through-hole, allowing the two layers of liquid cooling water channels to be interconnected internally. It should be noted that the inlet 2 of the liquid cooling plate 1 connects to the liquid cooling water channel on the second side, and the outlet 3 of the liquid cooling plate 1 connects to the liquid cooling water channel on the first side. Figure 2 In the liquid cooling plate shown, the first side of the liquid cooling plate is its front side, and the second side of the liquid cooling plate is its back side.

[0041] To better facilitate the connection of the liquid cooling plate 1, in this embodiment, the inlet and outlet 3 of the liquid cooling plate 1 are converged at one point, making the inlet and outlet 3 centrally located and convenient for manufacturing pipe connection integration. Furthermore, the inlet and outlet 3 are connected to the liquid cooling channel using a standard quick-connect interface. In actual use, the coolant enters the liquid cooling channel on the second side of the liquid cooling plate 1 through the inlet 2, then enters the surface liquid cooling channel on the first side of the liquid cooling plate 1 through the internal through-hole, and finally flows out through the outlet 3. In one embodiment, a drain port 4 is provided at the bottom of the liquid cooling plate 1 for venting air during liquid injection and draining liquid during maintenance.

[0042] Please refer to Figure 5 Based on the design of the liquid cooling plate 1, by planning the internal liquid cooling channels and corresponding heat-generating IGBTs on both sides of the liquid cooling plate 1, multiple IGBT modules 5 in the PCS are distributed on both sides of the liquid cooling plate 1. The IGBT modules 5 on the first side of the liquid cooling plate 1 and the IGBT modules 5 on the second side of the liquid cooling plate 1 are electrically connected through a laminated copper busbar. In one embodiment, the AC side IGBT modules are installed on the first side of the liquid cooling plate, and the DC side IGBT modules are installed on the second side of the liquid cooling plate. By adopting a highly efficient liquid cooling mode with IGBT heat-generating units arranged on both sides, the DC / AC bidirectional converter structure (implemented by multiple IGBT modules 5) becomes more compact, saving space in the entire core device structure. At the same time, the IGBT modules 5 on both sides of the liquid cooling plate 1 are also connected to the AC side copper busbar 7 and the DC side laminated copper busbar 8, respectively realizing the connection between the AC side and the DC side. In this embodiment, the side with the AC side copper busbar is provided with an IGBT driver board 9.

[0043] For further information, please refer to the following: Figure 2To reduce the temperature difference between the IGBTs on the liquid cooling plate 1, in this embodiment, the number of IGBT modules 5 on the second side of the liquid cooling plate 1 is greater than the number of IGBT modules 5 on the first side. For example, in a DC / AC bidirectional converter, due to the low inlet temperature and high outlet temperature, 18 IGBT modules 5 are arranged on the first side (back side) of the liquid cooling plate 1, and 9 IGBT modules 5 are arranged on the second side (front side), which can better reduce the temperature difference. Specifically, in this example, 6 IGBT modules are distributed on a single phase of the DC side, and 3 IGBT modules are distributed on a single phase of the AC side. The DC side uses a drive mode to convert the DC wave function oscillation into AC, which generates a large amount of heat. Therefore, the DC side is attached to the inlet side (the inlet water temperature is lower than the outlet water temperature).

[0044] In one embodiment, two parallel DC / AC bidirectional converters can be provided on the liquid cooling plate 1. In this case, 36 IGBT modules 5 are provided on the first side of the liquid cooling plate 1 and 18 IGBT modules 5 are provided on the second side.

[0045] Please continue to refer to this. Figure 2 , Figure 5 Since the multiple IGBT modules 5 of the PCS are distributed on both sides of the liquid cooling plate 1, in this embodiment, through holes are provided on the liquid cooling plate 1. The through holes are used to install the stacked copper busbar 6 to realize the electrical connection between the IGBT modules 5 on the front and back sides of the liquid cooling plate 1.

[0046] This embodiment also provides a design method for the liquid cooling plate 1 of the double-layer liquid cooling channel. The liquid cooling plate 1 is milled on both sides, and then a cover plate is welded and sealed using friction stir welding. Fluid simulation design is used to perform a variable diameter design for the liquid cooling channel, achieving reasonable flow distribution in the liquid cooling pipe. The IGBT module 5 is placed on the liquid cooling plate 1, and flow channel simulation verification confirms that the temperature difference between different phases of the product is controlled within a small range.

[0047] Energy storage battery systems generally consist of four main parts: PCS (Power Control System), battery pack, BMS (Battery Management System), and EMS (Energy Management System). This applies to both small commercial energy storage units (cabinet-style) and large containerized systems. Heat dissipation is primarily addressed for the PCS inverter and battery pack; therefore, please refer to [the relevant documentation / reference]. Figure 6 In one embodiment, a centralized energy storage cooling system is also proposed, comprising: the aforementioned integrated energy storage converter cooling system and a battery pack, the battery pack including a liquid cooling plate for cooling the battery pack, the battery pack liquid cooling plate being connected in parallel to the liquid cooling channel provided by the liquid cooling unit of the energy storage system. It should be noted that the energy storage battery system also includes other components, but these are not the focus of this invention and will not be described in detail here.

[0048] In this embodiment, the energy storage converter uses a double-layer liquid cooling plate to dissipate heat from the core IGBT power module. Internal electrical components such as circuit breakers, copper busbars, reactors, transformers, and large capacitors utilize a liquid / air cooling internal circulation system for heat exchange, centrally transferring heat to the energy storage system's liquid cooling unit for unified external heat exchange. The liquid cooling unit also simultaneously provides heat exchange for the lithium-ion battery pack, thus achieving a centralized liquid cooling mode for the entire energy storage system.

[0049] In one embodiment, the energy storage converter employs a hybrid cooling mode, connecting a battery pack liquid cooling plate in parallel and an electronically controlled shunt in parallel to achieve temperature-controlled shunt. By collecting and analyzing ambient temperatures, flow control is performed to achieve system-level temperature balance, realizing a centralized cooling mode for the energy storage system, significantly reducing energy consumption and improving system efficiency.

[0050] The energy storage system proposed in this invention achieves centralized heat dissipation. The battery pack, energy storage inverter, and integrated step-up transformer all employ a centralized heat dissipation mode, thereby significantly reducing inverter size, improving the efficiency of the entire liquid-cooled unit, increasing the overall energy efficiency of the energy storage unit, and reducing energy consumption. This also reduces the decentralized costs of the liquid cooling system. The overall system structure can be simplified, thereby reducing system product costs, improving efficiency, manufacturability, and maintenance efficiency. By achieving a centralized heat dissipation mode for the energy storage system, the need for independent liquid-cooled fans for the energy storage inverter and other liquid-cooled units is reduced, significantly lowering costs, reducing energy consumption, and improving system efficiency.

[0051] The integrated energy storage converter heat dissipation system and centralized energy storage heat dissipation system proposed in this utility model have the following advantages:

[0052] 1. In the energy storage converter, a liquid cooling plate design with a double-layer liquid cooling channel is adopted to effectively reduce the temperature difference between the two IGBT modules.

[0053] 2. The liquid cooling plate features a double-layer design, converging the inlet and outlet in one place, which facilitates the manufacturing and integration of pipelines.

[0054] 3. The energy storage inverter adopts a hybrid heat dissipation mode. The liquid cooling plate directly exchanges heat to the IGBT module, while the heat sink plus fan air cooling mode dissipates heat to the internal electrical components of the energy storage inverter, such as circuit breakers, copper busbars, reactors, transformers, and large capacitors.

[0055] 4. The energy storage converter adopts a hybrid air-liquid cooling mode, realizing the series connection of liquid cooling pipes to complete the heat dissipation of the IGBT module and other heat dissipation devices inside the energy storage converter.

[0056] 5. The heat dissipation channel of the energy storage converter is connected in parallel to the liquid cooling plate of the battery module to realize the centralized heat dissipation mode of the energy storage system, reduce the need for independent liquid cooling fans and other liquid cooling units for the energy storage converter, and greatly reduce costs, reduce energy consumption and improve system efficiency.

[0057] It should be noted that, in the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The accompanying drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0058] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. An integrated energy storage converter heat dissipation system, characterized in that, include: The energy storage converter includes multiple IGBT modules, electrical components, and a liquid cooling plate. The multiple IGBT modules are distributed on the liquid cooling plate for heat dissipation, and the electrical components are cooled by a liquid cooling heat exchanger or a fan. The energy storage system liquid cooling unit provides a liquid cooling channel and completes heat exchange externally; the liquid cooling plate of the energy storage converter is connected to the liquid cooling channel.

2. The integrated energy storage converter heat dissipation system according to claim 1, characterized in that, The multiple IGBT modules are distributed on both sides of the liquid cooling plate, and the IGBT modules on the first side of the liquid cooling plate are electrically connected to the IGBT modules on the second side of the liquid cooling plate through a stacked copper busbar.

3. The integrated energy storage converter heat dissipation system according to claim 2, characterized in that, The liquid cooling plate has a through hole in the middle, which is used to install the stacked copper busbar to realize the electrical connection between the IGBT modules on the first and second sides of the liquid cooling plate.

4. The integrated energy storage converter heat dissipation system according to claim 1 or 2, characterized in that, The liquid cooling plate includes a double-layer liquid cooling channel, which is interconnected by a through hole; the inlet of the liquid cooling plate is connected to the liquid cooling channel on the second side, and the outlet of the liquid cooling plate is connected to the liquid cooling channel on the first side.

5. The integrated energy storage converter heat dissipation system according to claim 4, characterized in that, The number of IGBT modules on the second side of the liquid cooling plate is greater than the number of IGBT modules on the first side of the liquid cooling plate.

6. The integrated energy storage converter heat dissipation system according to claim 5, characterized in that, An AC-side IGBT module is mounted on the first side of the liquid cooling plate, and a DC-side IGBT module is mounted on the second side of the liquid cooling plate.

7. The integrated energy storage converter heat dissipation system according to claim 4, characterized in that, The inlet and outlet of the liquid cooling plate are both located on the top of the liquid cooling plate.

8. The integrated energy storage converter heat dissipation system according to claim 4, characterized in that, The inlet and outlet of the liquid cooling plate are both implemented using standard quick-connect interfaces.

9. The integrated energy storage converter heat dissipation system according to claim 1, characterized in that, When the electrical components are cooled by a liquid-cooled heat exchanger, the liquid-cooled heat exchanger is connected in series in the liquid-cooled pipes connected by the liquid-cooled plate; wherein, the electrical components include circuit breakers, copper busbars, reactors, transformers and large capacitors.

10. A centralized energy storage and heat dissipation system, characterized in that, include: The integrated energy storage converter heat dissipation system according to any one of claims 1 to 9; The battery pack includes a liquid cooling plate for heat dissipation, the liquid cooling plate being connected in parallel to a liquid cooling channel provided by a liquid cooling unit in the energy storage system.

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