Phase change liquid cooling composite cooling module and electrochemical energy storage electric device thereof
Patent Information
- Application Number
- CN202522407638.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-13
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-13
AI Technical Summary
并且现有的电化学储能装置内部热安全管理部件，仅提供系统的热量排出，无法同时满足电化学储能装置在充放电过程中的体积变化需求
本实用新型的相变液冷复合冷却模块实现了导热，液冷，缓冲和阻燃绝热多项功能一体化，便于电化学储能装置的批量化，自动化组装生产，以降低成本；相变液冷复合冷却模块各部件结构简单，均采用简化搅拌、浇铸，裁切和堆叠工艺，制程短，制程成本低。
Smart Images
Figure CN224862295U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of electrochemical energy storage, and in particular relates to an electrochemical energy storage device based on a phase change liquid cooling composite cooling module. Background Technology
[0002] As new energy vehicles and electrochemical energy storage devices and power systems play an increasingly important role in various sectors of national economy and people's livelihood, their safety has attracted much attention. Thermal safety, as one of the core indicators for system evaluation, has received unprecedented attention.
[0003] Thermal safety management in common electrochemical energy storage devices and systems primarily focuses on the structural design of trays, covers, or liquid cooling pipe arrangements, shapes, and dimensions. However, descriptions of the internal thermal safety management structures and components of electrochemical energy storage devices, especially between individual units, are limited. Furthermore, existing internal thermal safety management components in electrochemical energy storage devices only provide heat dissipation for the system and cannot simultaneously meet the volume change requirements of the electrochemical energy storage device during charging and discharging. Utility Model Content
[0004] To address the aforementioned shortcomings, this utility model provides an electrochemical energy storage device based on a phase change liquid cooling composite cooling module. The aim is to dissipate heat from the electrochemical energy storage device, balance volume changes and stress between individual cells within the device, and provide thermal isolation during thermal runaway, especially during thermal propagation. This ensures that the electrochemical energy storage device remains within its optimal operating temperature range over the long term, thereby improving its safety performance.
[0005] This utility model discloses an electrochemical energy storage device based on a phase change liquid-cooled composite cooling module, including a battery unit and a phase change liquid-cooled composite cooling module. The battery unit includes several individual cells, which are attached to the surface of the phase change liquid-cooled composite cooling module. The phase change liquid-cooled composite cooling module includes a liquid cooling pipe and a composite plate. The composite plate has a receiving space, and the liquid cooling pipe is disposed in the receiving space. The liquid cooling pipe includes a quick connector, which is connected to a circulating cooling system.
[0006] Preferably, the width of the accommodating space is greater than the diameter of the liquid cooling pipe; an expansion gap is reserved after the liquid cooling pipe is installed in the accommodating space.
[0007] Preferably, a buffer pad is provided inside the expansion gap.
[0008] Preferably, the thickness of the buffer pad is greater than the diameter of the liquid cooling pipe. The buffer pad bears the external compressive force, preventing damage to the liquid cooling pipe.
[0009] Preferably, an insulation pad is provided between the liquid cooling pipes. The insulation pad can prevent abnormal heat conduction, thereby ensuring normal cooling.
[0010] Preferably, the insulation pad is sandwiched between two buffer pads to form a sandwich structure.
[0011] Preferably, a flame-retardant heat-conducting plate is disposed on the outer side of the composite plate. The flame-retardant heat-conducting plate transfers external heat into the phase change liquid-cooled composite cooling module, and the heat is carried away by the liquid movement. The flame-retardant heat-conducting plate is adhered to the outer side of the buffer pad with flame-retardant adhesive.
[0012] Preferably, the composite plate includes a first type E paraffin composite module and a second type E paraffin composite module.
[0013] Preferably, the liquid cooling pipe is at least one of a serpentine pipe, a parallel pipe, or a microchannel pipe.
[0014] Compared with the prior art, the beneficial effects of this utility model are: The phase change liquid-cooled composite cooling module of this invention integrates multiple functions such as heat conduction, liquid cooling, buffering and flame retardant insulation, which facilitates the mass production and automated assembly of electrochemical energy storage devices to reduce costs. The components of the phase change liquid-cooled composite cooling module have simple structures and adopt simplified stirring, casting, cutting and stacking processes, resulting in short process and low process cost.
[0015] Compared to the liquid cooling components between cells in other electrochemical energy storage devices, this invention encapsulates the liquid cooling pipe within a paraffin composite module and employs a flame-retardant, insulating, and thermally conductive pad for double insulation protection, thereby improving the insulation and high-voltage resistance performance of the phase change liquid-cooled composite cooling module. While ensuring the removal of excess heat from the device, it also prevents and isolates the path of heat conduction from a single cell in the thickness direction to adjacent cells in the event of thermal anomalies or thermal runaway. Finally, it comprehensively ensures the safety of the device by considering the thickness compatibility and balance of the pre-compression pressure and volume changes of the individual cells throughout their lifespan. The liquid cooling pipes employ an S-shaped design, allowing the coolant to flow in either top-down or opposite directions. Combined with a paraffin composite module, this reduces the temperature gradient across the individual cells from near the conductive electrode post to the bottom of the electrical device, achieving relatively uniform cell temperature. This minimizes the temperature difference between individual cell micro-regions and the overall electrical device, improving temperature consistency. The top-down, series cooling scheme prioritizes cooling the area near the higher electrode posts, effectively controlling cell temperature uniformity and overall temperature consistency within the electrical device. This, in turn, controls cell expansion, preventing localized temperature-stress coupling damage and ultimately extending the device's lifespan and safety performance. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the phase change liquid cooling composite cooling module of this utility model; Figure 3 This is a schematic diagram of the composite panel structure of this utility model; Figure 4 This is a schematic diagram of the liquid cooling pipe structure of this utility model; Figure 5 This is a schematic diagram of the installation structure of the flame-retardant heat-conducting plate of this utility model; Figure 6 This is a schematic diagram of the installation structure of the buffer pad of this utility model; Figure 7 This is a schematic diagram of the installation structure of the thermal insulation pad of this utility model.
[0017] Reference numerals: 1. Phase change liquid cooling composite cooling module; 101. Flame retardant heat conduction plate; 102. Liquid cooling pipe; 1021. Quick connector; 103. Buffer pad; 104. Heat insulation pad; 105. Composite plate; 1051. First E-type paraffin composite module; 1052. Second E-type paraffin composite module; 2. Battery unit; 201. Single cell. Detailed Implementation
[0018] To make the technical means, creative features, and achieved objectives and effects of this utility model readily understandable, the technical solutions of this 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 this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0019] like Figures 1 to 2 As shown, the electrochemical energy storage device based on a phase change liquid-cooled composite cooling module in this embodiment includes a battery unit 2 and a phase change liquid-cooled composite cooling module 1. The battery unit 2 includes several individual cells 201, which are attached to the surface of the phase change liquid-cooled composite cooling module 1. The phase change liquid-cooled composite cooling module 1 includes a liquid cooling pipe 102 and a composite plate 105. The composite plate 105 has an accommodating space, and the liquid cooling pipe 102 is disposed within the accommodating space. The liquid cooling pipe 102 includes a quick connector 1021, which is connected to a circulating cooling system. In this embodiment, the liquid cooling pipe 102 is a serpentine pipe, which can be square or round. The width of the accommodating space is greater than the diameter of the liquid cooling pipe 102; an expansion gap is reserved after the liquid cooling pipe 102 is installed in the accommodating space. A flame-retardant heat-conducting plate 101 is disposed outside the composite plate 105. Composite board 105 is made of a mixture of paraffin wax, expanded graphite, and alumina, with a mass ratio of 7:1:2 to 9:0.2:0.8. (For example...) Figure 3As shown, the composite plate 105 includes a first E-type paraffin composite module 1051 and a second E-type paraffin composite module 1052. During preparation, paraffin is heated to (60±5)℃ to form a fully liquid paraffin solution. Then, expanded graphite (EG) and alumina powder are added to the paraffin solution and thoroughly stirred and mixed under vacuum. The mixture is then poured into a pre-made "E"-shaped mold cavity, cooled, and demolded to obtain the "E"-type paraffin composite module. Figure 4 The liquid cooling pipe 102 is bent and installed onto the "E"-shaped paraffin composite module. Utilizing the excellent thermal conductivity of paraffin and alumina, combined with the unique layered porous structure of expanded graphite, the temperature stability of the paraffin is improved. The melting point of the paraffin enables solid-liquid conversion, thereby achieving a phase change function. The quick connector 1021 is connected to the inlet and outlet of the liquid cooling pipe 102 and then connected to the circulating cooling system, allowing cold water to flow into the liquid cooling pipe 102 for cooling. The width of the adjacent dendritic gaps at the head of the paraffin composite module is 0-2 mm larger than the width and diameter of the liquid cooling pipe (i.e., the peripheral dimensions of the liquid cooling pipe) to accommodate the installation of the paraffin composite module and the liquid cooling pipe 102, as well as to allow for the radial pressure of the coolant flowing in the liquid cooling pipe and the volume expansion gap after heating.
[0020] like Figure 5 and Figure 6 As shown, a buffer pad 103 is installed within the expansion gap. The thickness of the buffer pad 103 is greater than the diameter of the liquid cooling pipe 102. This is to meet the thickness expansion balance and stress equilibrium of the electrochemical energy storage device cell 201 during charging and discharging and at the end of a cyclic charging and discharging process. The buffer pad 103 is made of a soft material and should have insulating properties. Even after the total thickness of the buffer pad 103 is compressed by 60% to 80%, it should still be greater than the diameter of the liquid cooling pipe 102 to avoid damage to the liquid cooling pipe 102 due to compression. The buffer pad 103 is typically made of silicone / polyurethane foam.
[0021] like Figure 7 As shown, a heat insulation pad 104 is provided between the liquid cooling pipes 102. To prevent the rapid transfer of heat from one cell to adjacent cells in extreme cases of thermal runaway in the electrochemical energy storage device, an additional flame-retardant heat insulation component (heat insulation pad 104) is required. In this embodiment, the heat insulation pad 104 is sandwiched between two buffer pads 103, forming a sandwich structure. The heat insulation pad 104 is made of ceramic material.
[0022] To further illustrate the effectiveness of the phase change liquid-cooled composite cooling module, it is demonstrated by placing the module within an electrochemical energy storage device. The phase change liquid-cooled composite cooling module is positioned along the thickness of each pair of individual cells within the electrochemical energy storage device, specifically as follows: Figure 1As shown in the diagram, the coolant inlet and outlet and quick connector 1021 at both ends of the phase change liquid-cooled composite cooling module 1 extend to the outside of the electrochemical energy storage device 2 to connect with other liquid cooling devices or heat exchangers of the electrochemical energy storage and power consumption device. Furthermore, to improve the fit between the phase change liquid-cooled composite cooling module 1 and the individual cells 201 in the electrochemical energy storage device 2, pre-compression is performed in the thickness direction of the electrochemical energy storage device to ensure bidirectional fit between the flame-retardant thermal conductive pad 101 in the phase change liquid-cooled composite cooling module 1 and the liquid cooling pipe and the individual cells 201. Under the action of each individual cell 201 in the electrochemical energy storage device 2, the flame-retardant buffer pad 103 is compressed in the thickness direction to balance the uneven thickness of each individual cell 201 and the volume changes during charging, discharging or power consumption.
[0023] The above descriptions are merely embodiments of this utility model, and the specific structures and characteristics disclosed in the solutions are not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. An electrochemical energy storage device based on a phase change liquid-cooled composite cooling module, comprising a battery unit (2) and a phase change liquid-cooled composite cooling module (1), characterized in that, The battery cell (2) includes several cells (201), and several cells (201) are attached to the surface of the phase change liquid cooling composite cooling module (1). The phase change liquid cooling composite cooling module (1) includes a liquid cooling pipe (102) and a composite plate (105). The composite plate (105) is provided with an accommodating space. The liquid cooling pipe (102) is disposed in the accommodating space. The liquid cooling pipe (102) includes a quick connector (1021), and the quick connector (1021) is connected to the circulating cooling system.
2. The electrochemical energy storage device based on a phase change liquid-cooled composite cooling module according to claim 1, characterized in that, The width of the accommodating space is greater than the diameter of the liquid cooling pipe (102); an expansion gap is reserved after the liquid cooling pipe (102) is installed in the accommodating space.
3. The electrochemical energy storage device based on a phase change liquid-cooled composite cooling module according to claim 2, characterized in that, A buffer pad (103) is provided inside the expansion gap.
4. The electrochemical energy storage device based on a phase change liquid-cooled composite cooling module according to claim 3, characterized in that, The thickness of the buffer pad (103) is greater than the diameter of the liquid cooling pipe (102).
5. The electrochemical energy storage device based on a phase change liquid-cooled composite cooling module according to claim 3, characterized in that, An insulating pad (104) is provided between the liquid cooling pipes (102).
6. The electrochemical energy storage device based on a phase change liquid-cooled composite cooling module according to claim 5, characterized in that, The heat insulation pad (104) is sandwiched between two buffer pads (103) to form a sandwich structure.
7. The electrochemical energy storage device based on a phase change liquid-cooled composite cooling module according to claim 1, characterized in that, A flame-retardant heat-conducting plate (101) is provided on the outside of the composite plate (105).
8. The electrochemical energy storage device based on a phase change liquid-cooled composite cooling module according to claim 1, characterized in that, The composite panel (105) includes a first E-type paraffin composite module (1051) and a second E-type paraffin composite module (1052).
9. The electrochemical energy storage device based on a phase change liquid-cooled composite cooling module according to any one of claims 1 to 8, characterized in that, The liquid cooling pipe (102) is at least one of a serpentine pipe, a parallel pipe, or a microchannel pipe.