Battery thermal management device based on dot matrix cold plate

Abstract

This application provides a battery thermal management device based on a dot-matrix cold plate. The device includes: a battery module; a dot-matrix cold plate composed of a dot-matrix structure; the dot-matrix structure forming microchannels for coolant flow within the dot-matrix cold plate; the battery module being attached to the surface of the dot-matrix cold plate; and a coolant circulation assembly connected to the dot-matrix cold plate to drive coolant flow within the dot-matrix cold plate. This application, by utilizing a dot-matrix cold plate with internal microchannels for coolant flow, can increase the heat dissipation area of ​​the battery module and improve heat exchange efficiency. The battery thermal management device provided in this application is mainly suitable for battery thermal management in extremely cold regions. The use of a dot-matrix cold plate can improve the heat dissipation efficiency of the battery module, solving the problems of uneven heat dissipation, heavy weight, and inconvenient maintenance of existing cold plates.

Description

Technical Field

[0001] This application belongs to the field of battery management technology, and in particular relates to a battery thermal management device based on a dot matrix cold plate. Background Technology

[0002] With the rapid development of the new energy industry, high-energy-density battery systems (such as lithium-ion batteries and solid-state batteries) are increasingly widely used in electric vehicles, smart grid energy storage, and aerospace. Their thermal management performance directly determines the system's safety, cycle life, and energy efficiency. However, if the Joule heat and reaction heat generated during high-rate charging and discharging cannot be dissipated in time, multiple physicochemical failure mechanisms will be triggered: on the one hand, increased temperature will exacerbate irreversible side reactions such as electrolyte decomposition, electrode material phase transitions, and SEI film thickening, leading to rapid capacity decay; on the other hand, thermal stress concentration caused by temperature gradients within the battery module may cause fatigue damage to structural components, electrode interface peeling, and even trigger a thermal runaway chain reaction. This multi-physics coupling effect of thermo-electricity-mechanical fields makes an efficient thermal management system a core technological bottleneck for ensuring the reliable operation of battery systems.

[0003] Currently, mainstream liquid cooling technologies mainly rely on serpentine or parallel flow channel cold plates designed based on classical fluid dynamics theory. Serpentine channels increase total heat transfer by extending the coolant residence time, but their unidirectional flow characteristics lead to significant temperature gradients along the flow path (local temperature differences can reach 5-8℃), violating the isothermal design principle and easily forming local hot spots. While parallel flow channels improve flow distribution through multiple branch channels, they are limited by the Poisson's laminar velocity distribution characteristics, resulting in a parabolic distribution of coolant velocity at the center and near the wall, leading to a 30%-40% reduction in the convective heat transfer coefficient near the wall and similarly causing localized overheating in the edge areas. Furthermore, traditional cold plates are manufactured from solid metals (such as aluminum or copper) through machining or casting processes. To meet pressure resistance and sealing requirements, wall thickness often needs to be increased, resulting in redundant structural mass (ineffective mass accounting for 40%-60%), which contradicts the trend towards lightweight and compact battery systems.

[0004] To address the aforementioned issues, various improvement schemes exist, such as enhancing heat transfer by adding turbulence promoters, using high thermal conductivity phase change materials to assist in temperature homogenization, or introducing microchannel structures to improve the surface area-to-volume ratio. However, these methods either lead to soaring costs due to structural complexity or are difficult to adapt to wide operating conditions due to insufficient material phase change stability. In recent years, biomimetic lattice structures have attracted attention due to their unique porous media properties. Their three-dimensional periodic cell design can achieve topological matching between material distribution and heat flow paths, exhibiting a comprehensive heat transfer performance 1.5-2 times higher than traditional structures in theoretical calculations (Nuser number increased by 25%-50%, friction factor f reduced by 10%-20%). However, key challenges remain in practical applications: ① A quantitative correlation model between porosity and compressive strength has not yet been established, making it difficult to achieve a dynamic balance between lightweighting and structural stability; ② The response mechanism of cell geometric parameters (such as rod diameter, tilt angle, and cell type) to non-uniform heat flow fields is unclear, resulting in heat dissipation blind spots in areas of abrupt changes in local heat flux density; ③ Precision control and cost constraints of multi-scale manufacturing processes (such as selective laser melting) hinder their industrial application. Summary of the Invention

[0005] This application provides a battery thermal management device based on a dot matrix cold plate, which solves the problems of uneven heat dissipation, heavy weight, and inconvenient maintenance of cold plates in the prior art.

[0006] In a first aspect, this application provides a battery thermal management device based on a dot matrix cold plate. The device includes: a battery module; a dot matrix cold plate composed of a dot matrix structure; the dot matrix structure forming microchannels for coolant flow inside the dot matrix cold plate; the battery module being attached to the surface of the dot matrix cold plate; and a coolant circulation assembly connected to the dot matrix cold plate to drive coolant flow within the dot matrix cold plate.

[0007] In one implementation of the first aspect, the interior of the lattice cold plate exhibits a periodic lattice structure distribution; the periodic lattice structure forms microchannels for coolant flow within the lattice cold plate.

[0008] In one implementation of the first aspect, the coolant circulation assembly includes a pump, an external heat exchange component, and a coolant pipe; the pump is located on one side of the battery module; the pump is connected to the lattice cold plate through the coolant pipe, so that the pump drives the coolant to flow from the coolant pipe into the lattice cold plate, and then out through the microchannels inside the lattice cold plate; the external heat exchange component is attached to the lattice cold plate.

[0009] In one implementation of the first aspect, the upper or lower surface of the battery module is attached to a matrix cold plate; the matrix cold plate includes a first side and a second side disposed opposite to each other; the first side is provided with an inlet, and the second side is provided with an outlet; the pump is connected to the inlet through a coolant pipe, so that the pump drives the coolant to flow from the inlet into the matrix cold plate, and flow out from the outlet through the microchannels inside the matrix cold plate.

[0010] In one implementation of the first aspect, the upper and lower surfaces of the battery module are both attached to a lattice cold plate; each lattice cold plate includes a first side and a second side disposed opposite to each other; the first side is provided with an inlet, and the second side is provided with an outlet; one side of the pump is connected to the inlet of the lattice cold plate on the upper surface of the battery module through a coolant pipe; the other side of the pump is connected to the outlet of the lattice cold plate on the lower surface of the battery module through a coolant pipe, and the outlet of the lattice cold plate on the upper surface of the battery module and the inlet of the lattice cold plate on the lower surface of the battery module are connected through the coolant pipe.

[0011] In one implementation of the first aspect, a control component is further included, connected to the battery module. The control component includes a controller and a temperature sensor. The temperature sensor is disposed on the surface of the battery module. The controller is connected to the temperature sensor. The temperature sensor is used to collect the temperature of the battery module. The controller is used to control the flow rate of the coolant in the dot matrix cold plate.

[0012] In one implementation of the first aspect, the lattice structure is a honeycomb structure, a rhomboid structure, or a three-dimensional truss structure; the microchannel is a fractal flow channel or a spiral flow channel.

[0013] In one implementation of the first aspect, the lattice cold plate is made of aluminum alloy or carbon fiber composite material.

[0014] In one implementation of the first aspect, the battery module includes at least one battery.

[0015] In one implementation of the first aspect, the dot matrix cold plate is detachably connected to the battery module; the dot matrix cold plate is detachably connected to the coolant circulation assembly.

[0016] As described above, the battery thermal management device based on a dot matrix cold plate described in this application has the following beneficial effects:

[0017] This application utilizes a matrix cold plate with internal microchannels for coolant flow, which increases the heat dissipation area of ​​the battery module and improves heat exchange efficiency. Furthermore, the matrix cold plate used in this application is lighter and has a larger heat dissipation area compared to traditional solid cold plates. The battery thermal management device based on a matrix cold plate provided in this application is mainly suitable for battery thermal management in extremely cold regions. The matrix cold plate improves the heat dissipation efficiency of the battery module, solving the problems of uneven heat dissipation, heavy weight, and inconvenient maintenance associated with existing cold plates.

[0018] This application utilizes a lattice-type cold plate with an internally designed periodic dot matrix structure to prevent localized overheating in the battery module, maintaining a stable temperature difference and ensuring uniform heat dissipation. Simultaneously, the application incorporates microchannels with fractal or spiral flow channels to enhance coolant turbulence and improve heat dissipation efficiency.

[0019] This application maximizes the heat dissipation area of ​​the battery module by setting dot-matrix cold plates on both the upper and lower surfaces, thereby further improving heat exchange efficiency. Simultaneously, the modular design of the battery module in this application can adapt to battery packs of different shapes, offering greater adaptability and scalability. Attached Figure Description

[0020] Figure 1 The diagram shown is a schematic representation of the hardware structure of the battery thermal management device based on a dot matrix cold plate as described in an embodiment of this application.

[0021] Figure 2 Displayed as Figure 1 Rear view diagram.

[0022] Figure 3 The image shown is a top view of the lattice cold plate with the honeycomb lattice structure described in the embodiments of this application.

[0023] Figure 4 The image shown is a top view of the lattice cold plate with a rhombic lattice structure as described in the embodiments of this application.

[0024] Component designation explanation

[0025] 100 Battery thermal management device based on lattice cold plate

[0026] 101 Battery Module

[0027] 102 dot matrix cold plate

[0028] 1021 lattice structure

[0029] 1022 First Side

[0030] 10221 Liquid Inlet

[0031] 1023 Second side

[0032] 10231 liquid outlet

[0033] 103 Coolant Circulation Component

[0034] 1031 pump

[0035] 1032 External heat exchange components

[0036] 1033 Coolant Pipe

[0037] 104 Control Components

[0038] 1041 Controller

[0039] 1042 Temperature Sensor Detailed Implementation

[0040] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, unless otherwise specified, the following embodiments and features in the embodiments can be combined with each other.

[0041] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0042] The following embodiments of this application provide a battery thermal management device based on a dot-matrix cold plate, which solves the problems of uneven heat dissipation, heavy weight, and inconvenient maintenance of cold plates in the prior art. The battery thermal management device based on a dot-matrix cold plate provided in this application is mainly suitable for battery thermal management in extremely cold regions. By utilizing a dot-matrix cold plate, the heat dissipation efficiency of the battery module can be improved, solving the problems of uneven heat dissipation, heavy weight, and inconvenient maintenance of traditional cold plates.

[0043] The following will describe in detail the principle and implementation of a battery thermal management device based on a dot matrix cold plate according to this embodiment, with reference to the accompanying drawings, so that those skilled in the art can understand the battery thermal management device based on a dot matrix cold plate according to this embodiment without creative effort.

[0044] like Figure 1 As shown, this embodiment provides a battery thermal management device based on a dot matrix cold plate. The device 100 includes: a battery module 101, a dot matrix cold plate 102, and a coolant circulation assembly 103.

[0045] The dot matrix cold plate 102 is composed of a dot matrix structure 1021; the dot matrix structure 1021 forms microchannels 1011 inside the dot matrix cold plate 102 for coolant flow; the battery module 101 is attached to the surface of the dot matrix cold plate 102.

[0046] The coolant circulation assembly 103 is connected to the dot matrix cold plate 102 to drive the coolant to flow within the dot matrix cold plate 102.

[0047] In one embodiment, the battery thermal management device 100 based on a dot matrix cold plate further includes a control component 104, which is connected to the battery module 101 and is used to control the flow rate of coolant in the dot matrix cold plate 102.

[0048] This application uses a coolant circulation assembly 103 to drive coolant to flow in the microchannels 1022 within the matrix cold plate 102. As the coolant flows through the microchannels 1022, it absorbs heat from the battery module 101 and is discharged from the outlet. Simultaneously, the control assembly 104 controls the flow rate of coolant into the matrix cold plate 102. By controlling the flow rate, the battery temperature can be maintained within a preset temperature range (e.g., 25°C-40°C). For example, the control assembly 104 dynamically adjusts the flow rate of coolant into the matrix cold plate 102 using a PID algorithm to maintain the battery module temperature within the 25°C-40°C range.

[0049] It should be noted that the battery module includes at least one battery cell, with each cell closely arranged and bonded to the surface of the dot matrix cold plate via a thermally conductive interface material. The coolant includes, but is not limited to, aqueous ethylene glycol solution, propylene glycol-based coolant, silicate-based coolant, anhydrous coolant, ammonia refrigerant, etc.

[0050] The battery thermal management device based on a dot matrix cold plate provided in this application is mainly applicable to battery thermal management in extremely cold regions. The dot matrix cold plate can improve the heat dissipation efficiency of the battery module and solve the problems of uneven heat dissipation, heavy weight and inconvenient maintenance of the cold plate in the prior art.

[0051] In some implementations, this application provides two layers of dot matrix cold plates 102 on the upper and lower surfaces of the battery module 101. These two layers of dot matrix cold plates 102 are connected by a coolant pipe and a coolant circulation assembly 103. The coolant circulates and exchanges heat between the upper and lower layers of dot matrix cold plates 102 on the upper and lower surfaces of the battery module 101 through the coolant circulation assembly 103, thereby improving the heat exchange efficiency of the battery module 101.

[0052] This application utilizes a dot-matrix cold plate 102, in which microchannels 1022 for coolant flow are formed within the dot-matrix structure 1021. This increases the heat dissipation area of ​​the battery module and improves heat exchange efficiency. Furthermore, the dot-matrix cold plate used in this application is lighter and has a larger heat dissipation area compared to traditional solid cold plates. Additionally, by setting two layers of dot-matrix cold plates 102 on the upper and lower surfaces of the battery module 101, heat exchange efficiency can be further improved.

[0053] In one embodiment of this application, the interior of the lattice cold plate 102 exhibits a periodic lattice structure distribution; the periodic lattice structure forms microchannels for coolant flow inside the lattice cold plate 102.

[0054] In some implementations, the lattice cooling plate 102 is composed of a periodic lattice structure, which can be a honeycomb structure, a rhomboid structure, or a three-dimensional truss structure. The interior of the lattice cooling plate 102 forms microchannels for coolant flow through the periodic lattice structure. For example, the lattice structure is a honeycomb structure with a wall thickness of 0.5-2 mm and a pore size of 5-10 mm.

[0055] This application employs a dot-matrix cold plate composed of a periodic dot-matrix structure. The periodic dot-matrix distribution can avoid local overheating of the battery module, ensuring that the temperature difference of the battery module is ≤3℃.

[0056] like Figure 1 As shown, in one embodiment of this application, the coolant circulation assembly 103 includes a pump 1031, an external heat exchange component 1032, and a coolant pipe 1033; the pump 1031 is located on one side of the battery module 101; the pump 1031 is connected to the lattice cold plate 102 through the coolant pipe 1033, so that the pump 1031 drives the coolant to flow from the coolant pipe 1033 into the lattice cold plate 102, and then out through the microchannels inside the lattice cold plate 102; the external heat exchange component 1032 is attached to the lattice cold plate 102.

[0057] In one embodiment of this application, the upper or lower surface of the battery module 101 is attached to a matrix cold plate 102; the matrix cold plate 102 includes a first side 1022 and a second side 1023 disposed opposite to each other; the first side is provided with a liquid inlet 10221 and the second side is provided with a liquid outlet 10231; the pump 1031 is connected to the liquid inlet 10221 through a coolant pipe 1033, so that the pump 1031 drives the coolant to flow from the liquid inlet 10221 into the matrix cold plate 102, and flow out from the liquid outlet 10231 through the microchannels inside the matrix cold plate 102.

[0058] In one implementation, this application attaches a matrix cold plate 102 to a surface of the battery module 101, for example, the upper or lower surface of the battery module 101. The reason for attaching the matrix cold plate to the upper or lower surface of the battery module 101 is mainly because the upper or lower surface of the battery module 101 is the heat-generating area of ​​each battery. Attaching the matrix cold plate to the heat-generating area of ​​the battery can maximize the heat dissipation area of ​​the battery.

[0059] In one implementation, the upper surface of the battery module 101 is attached to a matrix cold plate 102; the matrix cold plate 102 includes a first side 1022 and a second side 1023 disposed opposite to each other; the first side is provided with a liquid inlet 10221 and the second side is provided with a liquid outlet 10231; the pump 1031 is connected to the liquid inlet 10221 through a coolant pipe 1033; the pump 1031 drives coolant to flow from the liquid inlet 10221 into the matrix cold plate 102, and out through the microchannels inside the matrix cold plate 102 from the liquid outlet 10231.

[0060] In another implementation, the lower surface of the battery module 101 is attached to a matrix cold plate 102; the matrix cold plate 102 includes a first side 1022 and a second side 1023 disposed opposite to each other; the first side is provided with an inlet 10221 and the second side is provided with an outlet 10231; the pump 1031 is connected to the inlet 10221 through a coolant pipe 1033; the pump 1031 drives coolant to flow from the inlet 10221 into the matrix cold plate 102, and out through the microchannels inside the matrix cold plate 102 from the outlet 10231.

[0061] The hardware structure in which the upper or lower surface of the battery module 101 is attached to the dot matrix cold plate 102, as described in this application embodiment, is not shown in the accompanying drawings, but can be found by referring to... Figure 1 For example, the upper surface of the battery module 101 is attached to a dot matrix cold plate 102, and the outlet of the dot matrix cold plate 102 attached to the upper surface of the battery module 101 is connected to the pump through a coolant pipe. This is a schematic diagram of the hardware structure of the upper surface of the battery module 101 attached to a dot matrix cold plate 102 in the embodiment of this application. Specific details are not provided here.

[0062] This application utilizes a dot matrix cold plate 102 on any outer surface of the battery module 101. A pump 1031 drives coolant from the inlet 10221 into the dot matrix cold plate 102, and through microchannels within the dot matrix cold plate 102, it flows out from the outlet 10231, forming a coolant circulation cycle and maintaining the temperature of each battery within a predetermined range. If one coolant circulation cycle is insufficient to maintain the temperature of each battery within the predetermined range, multiple coolant circulation cycles can be performed until the temperature of each battery stabilizes within the predetermined range. This application employs a dot matrix cold plate with an internal periodic dot matrix structure. The microchannels formed by the periodic dot matrix structure ensure uniform heat dissipation from each battery in the battery module, improving heat exchange efficiency. Furthermore, the dot matrix cold plate used in this application is lighter and has a larger heat dissipation area compared to traditional solid cold plates. The distribution of the periodic dot matrix structure within the dot matrix cold plate ensures uniform heat dissipation from the battery module, keeping the temperature difference between different heat dissipation areas within a small range and preventing localized overheating of the battery module. For example, the temperature difference between different heat dissipation areas of the battery module is less than or equal to 3°C. This application is not limited to this.

[0063] like Figure 1 As shown, in one embodiment of this application, the upper and lower surfaces of the battery module 101 are both attached to a dot matrix cold plate 102; each dot matrix cold plate 102 includes a first side 1022 and a second side 1023 disposed opposite to each other; the first side 1022 is provided with a liquid inlet 10221, and the second side 1023 is provided with a liquid outlet 10231.

[0064] One side of the pump 1031 is connected to the inlet 10221 of the dot matrix cold plate 102 on the upper surface of the battery module 101 via a coolant pipe 1033; the other side of the pump 1031 is connected to the outlet 10231 of the dot matrix cold plate 102 on the lower surface of the battery module 101 via a coolant pipe 1033. The outlet 10231 of the dot matrix cold plate 102 on the upper surface of the battery module 101 and the inlet 10221 of the dot matrix cold plate 102 on the lower surface of the battery module 101 are connected via the coolant pipe 1033.

[0065] The pump 1031 drives the coolant to flow from the inlet 10221 of the dot matrix cold plate 102 on the upper surface of the battery module 101 into the dot matrix cold plate 102 through the coolant pipe 1033. The coolant then flows through the microchannels inside the dot matrix cold plate 102 and out through the outlet 10231 into another coolant pipe 1033. Finally, the coolant flows out through the microchannels inside the dot matrix cold plate 102 and out through the outlet 10231, forming one coolant circulation cycle.

[0066] Figure 2 Displayed as Figure 1 The rear view. (e.g.) Figure 1-2 As shown, in one implementation, this application provides a matrix cold plate 102 on both the upper and lower surfaces of the battery module 101, i.e., the upper surface of the battery module 101 is in contact with a matrix cold plate 102, and the lower surface of the battery module 101 is in contact with a matrix cold plate 102; each of the matrix cold plates 102 includes a first side 1022 and a second side 1023 disposed opposite to each other; the first side 1022 is provided with a liquid inlet 10221, and the second side 1023 is provided with a liquid outlet 10231;

[0067] In this implementation, the pump 1031 drives the coolant to flow into the dot matrix cold plate 102 on the upper surface of the battery module 101 through the coolant pipe 1033 from the inlet 10221. The coolant then flows through the microchannels inside the dot matrix cold plate 102 and out through the outlet 10231 to the coolant pipe 1033. Finally, the coolant flows out through the microchannels inside the dot matrix cold plate 102 and out through the outlet 10231, forming one coolant circulation cycle.

[0068] This application utilizes the pump to drive coolant into the battery module 101 through an inlet on the upper surface. The coolant passes through microchannels within the two layers of dot-matrix cold plates on the upper and lower surfaces of the battery module 101, absorbing heat from the battery module. Finally, it flows out through an outlet on the lower surface of the battery module, thus forming a coolant circulation cycle and maintaining the battery temperature within a preset range. Simultaneously, by utilizing the two layers of dot-matrix cold plates on the upper and lower surfaces of the battery module, this application maximizes the heat dissipation area of ​​the battery module, improving heat exchange efficiency. Furthermore, the dot-matrix cold plates used in this application are lighter and have a larger heat dissipation area compared to traditional solid cold plates. The periodic dot-matrix structure distribution within the dot-matrix cold plates ensures uniform heat dissipation from the battery module, keeping the temperature difference between different heat dissipation areas within a small range and preventing localized overheating. For example, the temperature difference between different heat dissipation areas of the battery module is less than or equal to 3°C. This application is not limited to this.

[0069] In another implementation, this application provides a matrix cold plate 102 on both the upper and lower surfaces of the battery module 101, i.e., the upper surface of the battery module 101 is in contact with a matrix cold plate 102, and the lower surface of the battery module 101 is in contact with a matrix cold plate 102; each of the matrix cold plates 102 includes a first side 1022 and a second side 1023 disposed opposite to each other; the first side 1022 is provided with a liquid inlet 10221, and the second side 1023 is provided with a liquid outlet 10231;

[0070] One side of the pump 1031 is connected to the inlet 10221 of the dot matrix cold plate 102 on the lower surface of the battery module 101 via a coolant pipe 1033; the other side of the pump 1031 is connected to the outlet 10231 of the dot matrix cold plate 102 on the upper surface of the battery module 101 via a coolant pipe 1033. The outlet 10231 of the dot matrix cold plate 102 on the lower surface of the battery module 101 and the inlet 10221 of the dot matrix cold plate 102 on the upper surface of the battery module 101 are connected via the coolant pipe 1033.

[0071] In this implementation, the pump 1031 drives the coolant to flow into the dot matrix cold plate 102 on the lower surface of the battery module 101 through the coolant pipe 1033 from the inlet 10221. The coolant then flows through the microchannels inside the dot matrix cold plate 102 and out through the outlet 10231 to the coolant pipe 1033. Finally, the coolant flows out through the microchannels inside the dot matrix cold plate 102 and out through the outlet 10231, forming one coolant circulation cycle.

[0072] This application utilizes the pump to drive coolant into the battery module 101 through an inlet on its lower surface. The coolant passes through microchannels within the two layers of dot-matrix cold plates on the lower and upper surfaces of the battery module 101, absorbing heat from the battery module. Finally, it flows out through an outlet on the upper surface of the battery module, thus forming a coolant circulation cycle and maintaining the battery temperature within a preset range. Simultaneously, by utilizing the two layers of dot-matrix cold plates on the upper and lower surfaces of the battery module, this application maximizes the heat dissipation area of ​​the battery module, improving heat exchange efficiency. Furthermore, the dot-matrix cold plates used in this application are lighter and have a larger heat dissipation area compared to traditional solid cold plates. The periodic dot-matrix structure distribution within the dot-matrix cold plates ensures uniform heat dissipation from the battery module, keeping the temperature difference between different heat dissipation areas within a small range and preventing localized overheating. For example, the temperature difference between different heat dissipation areas of the battery module is less than or equal to 3°C. This application is not limited to this.

[0073] It should be noted that the size of each dot matrix cold plate 102 is matched with the size of the battery module 101, which maximizes the heat dissipation area of ​​the battery module 101 and improves the heat exchange efficiency.

[0074] A preferred embodiment of this application is to provide a dot matrix cold plate on both the upper and lower surfaces of the battery module. Compared with the above embodiment where a dot matrix cold plate is provided on any surface of the battery module 101, providing a dot matrix cold plate on both the upper and lower surfaces of the battery module allows for a larger heat dissipation area for each battery in the battery module. The two layers of dot matrix cold plates 102 are connected by a coolant pipe and a coolant circulation assembly 103. The coolant circulates and exchanges heat between the upper and lower layers of dot matrix cold plates 102 on the upper and lower surfaces of the battery module 101 through the coolant circulation assembly 103, which improves the heat exchange efficiency of the battery module 101. Furthermore, because heat dissipation occurs on both the upper and lower sides of each battery, the heat dissipation is more uniform.

[0075] This application utilizes two layers of dot matrix cold plates on the upper and lower surfaces of the battery module to maximize the heat dissipation area of ​​the battery module and improve heat exchange efficiency. Moreover, the dot matrix cold plates used in this application are lighter and have a larger heat dissipation area compared to traditional solid cold plates.

[0076] In one embodiment of this application, the control component 104 includes a controller 1041 and a temperature sensor 1042; the temperature sensor 1042 is disposed on the surface of the battery module 101; the controller 1041 is connected to the temperature sensor 1042; the temperature sensor 1042 is used to collect the temperature of the battery module 101; the controller 1041 is used to control the flow rate of the coolant in the dot matrix cold plate 102 according to the collected temperature.

[0077] In one implementation, the control component 104 includes a controller 1041 and a temperature sensor 1042. The temperature sensor 1042 is disposed on the surface of the battery module 101 and is communicatively connected to the controller 1041. The temperature sensor 1042 is used to collect the temperature of the battery module 101 so that the controller 1041 can control the flow rate of the coolant in the matrix cold plate 102 according to the collected temperature. For example, the controller 1041 adjusts the rotation speed of the pump 1031 through a PID algorithm, thereby controlling the flow rate of the coolant flowing into the matrix cold plate to control the temperature of the battery module within a preset temperature range (e.g., 25℃-40℃).

[0078] In one embodiment of this application, the lattice structure 1021 is a honeycomb structure, a rhombus structure, or a three-dimensional truss structure.

[0079] Figure 3 The image shown is a top view of the lattice cold plate with the honeycomb lattice structure described in the embodiments of this application. Figure 4 The image shown is a top view of the lattice cold plate with a rhomboid lattice structure as described in an embodiment of this application. Figure 3-4 As shown, the lattice structure inside the lattice cold plate is periodically distributed, and the periodic lattice structure forms microchannels for coolant flow.

[0080] In one implementation, the lattice cold plate is a one-piece molded structure. For example, the lattice cold plate is formed by 3D printing or precision casting. The lattice structure is a honeycomb structure with a wall thickness of 0.5-2 mm and a pore diameter of 5-10 mm.

[0081] In one embodiment of this application, the dot matrix cold plate 102 is made of aluminum alloy or carbon fiber composite material.

[0082] In one implementation, the lattice cold plate is made of a lightweight, highly thermally conductive material (e.g., aluminum alloy or carbon fiber composite). The size of the lattice cold plate is matched to the heat-generating area of ​​the battery module to maximize the heat dissipation area and improve heat dissipation efficiency.

[0083] In one embodiment of this application, the battery module includes at least one battery.

[0084] It should be noted that the battery module includes at least one battery, namely a battery cell, which is closely arranged and bonded to the surface of the dot matrix cold plate through a thermally conductive interface material.

[0085] In one embodiment of this application, the microchannel 1022 is a fractal flow channel or a spiral flow channel.

[0086] In one implementation, the microchannels formed within the dot matrix structure for coolant flow are either parting channels or spiral channels. These parting channels or spiral channels can enhance the turbulence effect of the coolant and further improve the heat dissipation efficiency of the battery module.

[0087] This application utilizes a dot matrix cold plate to increase the heat dissipation area of ​​the battery module, and further improves the heat dissipation efficiency of the battery module by combining a parting flow channel or a spiral flow channel design.

[0088] In one embodiment of this application, the dot matrix cold plate 102 is detachably connected to the battery module 101; the dot matrix cold plate 102 is detachably connected to the coolant circulation assembly 103.

[0089] In one implementation, the matrix cold plate 102 is detachably connected to the battery module 101, facilitating assembly and maintenance of the battery module. For example, when the matrix cold plate malfunctions, it can be disassembled for repair, making maintenance convenient and quick. Simultaneously, the matrix cold plate 102 is detachably connected to the coolant circulation assembly 103, facilitating assembly and maintenance between components.

[0090] In this implementation, the dot matrix cooling plate 102 is detachably connected to the battery module 101 and the coolant circulation assembly 103 via snap-fit ​​components (e.g., bayonet slots, slots); or, the dot matrix cooling plate 102 is detachably connected to the battery module 101 and the coolant circulation assembly 103 via slide rails; or, the dot matrix cooling plate 102 is detachably connected to the battery module 101 and the coolant circulation assembly 103 via screws. This application is not limited to connection methods such as snap-fit ​​components, slide rails, and screws.

[0091] In another implementation, the dot matrix cold plate 102 is fixedly connected to the battery module 101; the dot matrix cold plate 102 is fixedly connected to the coolant circulation assembly 103.

[0092] This application uses a square lithium-ion battery module as an example for illustration: This lithium-ion battery module includes several batteries, taking 4 batteries as an example. The upper and lower surfaces of this lithium-ion battery module are provided with a matrix cold plate. The two matrix cold plates are connected through a coolant pipe, and the two matrix cold plates are connected through a coolant pipe and a pump. Each matrix cold plate has an external heat exchange component on its outer side.

[0093] Temperature sensors are placed on the surface of the battery, and controllers are located on one side of the battery module. The controllers are connected to the temperature sensors and use a PID algorithm to adjust the pump speed to maintain the battery temperature within the range of 25-40℃.

[0094] The pump 1031 drives the coolant (e.g., an aqueous solution of ethylene glycol) to flow in from the inlet, absorb the battery heat through the microchannels in the two-layer lattice cold plates on the upper and lower surfaces of the battery module, and then discharge it from the outlet to control the temperature of each battery to be maintained within the range of 25-40°C.

[0095] In summary, the battery thermal management device based on a dot matrix cold plate described in this application has the following beneficial effects:

[0096] This application utilizes a matrix cold plate with internal microchannels for coolant flow, which increases the heat dissipation area of ​​the battery module and improves heat exchange efficiency. Furthermore, the matrix cold plate used in this application is lighter and has a larger heat dissipation area compared to traditional solid cold plates. The battery thermal management device based on a matrix cold plate provided in this application is mainly suitable for battery thermal management in extremely cold regions. The matrix cold plate improves the heat dissipation efficiency of the battery module, solving the problems of uneven heat dissipation, heavy weight, and inconvenient maintenance associated with existing cold plates.

[0097] This application utilizes a lattice-type cold plate with an internally designed periodic dot matrix structure to prevent localized overheating in the battery module, maintaining a stable temperature difference and ensuring uniform heat dissipation. Simultaneously, the application incorporates microchannels with fractal or spiral flow channels to enhance coolant turbulence and improve heat dissipation efficiency.

[0098] This application maximizes the heat dissipation area of ​​the battery module by setting dot-matrix cold plates on both the upper and lower surfaces, thereby further improving heat exchange efficiency. Simultaneously, the modular design of the battery module in this application can adapt to battery packs of different shapes, offering greater adaptability and scalability.

[0099] The descriptions of the processes or structures corresponding to the above figures each have their own emphasis. For parts of a process or structure that are not described in detail, please refer to the relevant descriptions of other processes or structures.

[0100] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A dot-matrix cold plate-based battery thermal management device, characterized by, The device includes: Battery module; The dot matrix cold plate is composed of a dot matrix structure; the dot matrix structure forms microchannels inside the dot matrix cold plate for the flow of coolant; the battery module is attached to the surface of the dot matrix cold plate. A coolant circulation assembly is connected to the lattice cold plate to drive the coolant to flow within the lattice cold plate; The coolant circulation assembly includes a pump, an external heat exchange component, and coolant pipes; the pump is located on one side of the battery module; the pump is connected to the lattice cold plate through the coolant pipe, so that the pump drives the coolant to flow from the coolant pipe into the lattice cold plate, and then out through the microchannels inside the lattice cold plate; the external heat exchange component is attached to the lattice cold plate.

2. The dot-matrix cold plate based battery thermal management device of claim 1, wherein, The interior of the lattice cold plate exhibits a periodic lattice structure distribution; the periodic lattice structure forms microchannels for coolant flow inside the lattice cold plate.

3. The dot-matrix cold plate based battery thermal management device of claim 1, wherein, The upper or lower surface of the battery module is attached to a dot matrix cold plate; the dot matrix cold plate includes a first side and a second side arranged opposite to each other; the first side is provided with an inlet and the second side is provided with an outlet; the pump is connected to the inlet through a coolant pipe so that the pump drives the coolant to flow from the inlet into the dot matrix cold plate and flow out from the outlet through the microchannels inside the dot matrix cold plate.

4. The dot-matrix cold plate based battery thermal management device of claim 1, wherein, The upper and lower surfaces of the battery module are both attached to a dot matrix cold plate; each dot matrix cold plate includes a first side and a second side arranged opposite to each other; the first side is provided with a liquid inlet and the second side is provided with a liquid outlet. One side of the pump is connected to the inlet of the dot matrix cold plate on the upper surface of the battery module via a coolant pipe; the other side of the pump is connected to the outlet of the dot matrix cold plate on the lower surface of the battery module via a coolant pipe, and the outlet of the dot matrix cold plate on the upper surface of the battery module and the inlet of the dot matrix cold plate on the lower surface of the battery module are connected through the coolant pipe.

5. The dot-matrix cold plate based battery thermal management device of claim 1, wherein, It also includes a control component connected to the battery module. The control component includes a controller and a temperature sensor. The temperature sensor is located on the surface of the battery module. The controller is connected to the temperature sensor. The temperature sensor is used to collect the temperature of the battery module. The controller is used to control the flow rate of the coolant in the dot matrix cold plate.

6. The dot-matrix cold plate based battery thermal management device of claim 1, wherein, The lattice structure is a honeycomb structure, a rhomboid structure, or a three-dimensional truss structure; the microchannel is a fractal flow channel or a spiral flow channel.

7. The dot-matrix cold plate based battery thermal management device of claim 1, wherein, The dot matrix cold plate is made of aluminum alloy or carbon fiber composite material.

8. The dot-matrix cold plate based battery thermal management device of claim 1, wherein, The battery module includes at least one battery.

9. The dot-matrix cold plate based battery thermal management device of claim 1, wherein, The dot matrix cold plate is detachably connected to the battery module; the dot matrix cold plate is detachably connected to the coolant circulation assembly.

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