Large side extrusion type side liquid cooling system for lithium ion battery

Abstract

The utility model relates to a kind of extruded side edge liquid cooling systems of lithium ion battery big side face, including rectangular shell, several rows of parallelly arranged battery cell are equipped in the rectangular shell, the side surface of the battery cell is equipped with liquid cooling plate, the side surface of the liquid cooling plate and whole row battery cell is pasted;One side of the liquid cooling plate is equipped with liquid inlet branch pipe and liquid outlet branch pipe, unidirectional flow channel for liquid medium flow is equipped in the liquid cooling plate, the both ends of the unidirectional flow channel are connected with liquid inlet branch pipe and liquid outlet branch pipe respectively;The outer end of the liquid inlet branch pipe is connected with liquid inlet main pipe, the outer end of the liquid outlet branch pipe is connected with liquid outlet main pipe, the liquid inlet main pipe and liquid outlet main pipe are connected with liquid cooling circulation system.The utility model relates to a kind of extruded side edge liquid cooling systems of lithium ion battery big side face, compared with traditional bottom liquid cooling, its side surface liquid cooling will heat exchange area expand several times, temperature control time is greatly shortened, effectively solve the problem of heat gathering in the upper region of battery cell, and the temperature difference of battery module can be reduced to within 5 ℃ by the design of multi-channel conical flow channel.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery liquid cooling technology, specifically to an extruded side liquid cooling system for the large side of a lithium-ion battery. Background Technology

[0002] With the increasing demands for battery energy density and charge / discharge efficiency from new energy vehicles and energy storage systems, heat dissipation of lithium-ion batteries has become a key factor limiting performance. Traditional bottom liquid cooling solutions suffer from problems such as long heat conduction paths and large temperature differences within the module (typically >8°C).

[0003] 1. Complex Structure: Compared to air-cooled systems, liquid-cooled systems have a more complex structure, including multiple components such as a coolant circulation system, cooling plates, water pumps, and radiators.

[0004] 2. Higher Cost: The manufacturing and maintenance costs of liquid cooling systems are higher than those of traditional air-cooling systems, especially for liquid cooling plates that require high-precision machining processes.

[0005] 3. High manufacturing process requirements: The production process of liquid cooling plates involves multiple complex steps such as stamping, cleaning, fluxing, riveting, and brazing, which require strict manufacturing precision. Utility Model Content

[0006] This invention provides an extruded side liquid cooling system for the large side of a lithium-ion battery to solve the problem of low heat dissipation efficiency in the prior art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An extruded side liquid cooling system for a large side of a lithium-ion battery includes a rectangular shell, inside which are arranged several rows of parallel battery cells. A liquid cooling plate is provided on the side of each battery cell, and the liquid cooling plate is attached to the side of the entire row of battery cells.

[0009] The liquid cooling plate is provided with an inlet pipe and an outlet pipe on one side, and a one-way flow channel for the liquid medium to flow is provided inside the liquid cooling plate. The two ends of the one-way flow channel are respectively connected to the inlet pipe and the outlet pipe.

[0010] The outer end of the liquid inlet branch pipe is connected to the liquid inlet main pipe, and the outer end of the liquid outlet branch pipe is connected to the liquid outlet main pipe. Both the liquid inlet main pipe and the liquid outlet main pipe are connected to the liquid cooling circulation system.

[0011] Furthermore, the battery cell is rectangular in shape, and the side with the largest area of ​​the battery cell is in contact with the liquid cooling plate.

[0012] Furthermore, the outer shell thickness of the liquid cooling plate is 2-5mm.

[0013] Furthermore, the unidirectional flow channel is either serpentine or parallel.

[0014] Furthermore, the liquid cooling medium is a 50% ethylene glycol aqueous solution, with an operating temperature range of -30°C to 50°C.

[0015] Furthermore, the interior of the rectangular housing is provided with strip-shaped protrusions for separating adjacent rows of battery cells, and the liquid cooling plate is fixed on the strip-shaped protrusions.

[0016] Furthermore, the rectangular outer shell is an aluminum alloy frame.

[0017] This utility model has the following advantages:

[0018] This invention provides an extruded side liquid cooling system for the large side surface of a lithium-ion battery. Compared to traditional bottom liquid cooling, side liquid cooling increases the heat exchange area several times and shortens the temperature control time by at least 50%, effectively solving the problem of heat accumulation in the upper part of the battery cell. Furthermore, the multi-channel conical flow design can reduce the temperature difference of the battery module to within 5°C, while also reducing system power consumption. Its rapid cooling capability can block abnormal heat conduction during thermal runaway, improving fast charging safety. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0020] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] Figure 1 An assembly drawing of an extruded side liquid cooling system for a large side of a lithium-ion battery, provided for an embodiment of this utility model;

[0022] Figure 2 A structural diagram of a liquid cooling plate in an extruded side liquid cooling system for a large side of a lithium-ion battery, provided for an embodiment of this utility model;

[0023] Figure 3 This is a system structure diagram of an extruded side liquid cooling system for a large side of a lithium-ion battery, provided as an embodiment of the present invention.

[0024] In the picture:

[0025] 1. Rectangular casing; 2. Battery cell; 3. Liquid cooling plate; 4. Liquid inlet manifold; 5. Liquid outlet manifold; 6. Liquid inlet main pipe; 7. Liquid outlet main pipe; 8. Liquid cooling circulation system; 9. Temperature sensor; 10. Solenoid valve. Detailed Implementation

[0026] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0027] like Figure 1 As shown, an extruded side liquid cooling system for the large side of a lithium-ion battery includes a rectangular shell 1. The rectangular shell 1 is an aluminum alloy frame that provides mechanical support and ensures the stable installation of the battery cell 2 and the liquid cooling plate 3, as well as ensuring a high degree of fit between the battery cell 2 and the liquid cooling plate 3.

[0028] The rectangular outer casing 1 contains several rows of parallel-arranged battery cells 2. Each battery cell 2 is a high-energy-density rectangular aluminum-cased battery cell 2. The number of cells in a single row can be adjusted according to requirements, such as 10-30 cells 2 per row. The battery cells 2 are electrically connected by connectors made of nickel strip or copper foil to ensure electrical conductivity between the battery cells 2.

[0029] The battery cell 2 has a liquid cooling plate 3 on its side, which is attached to the side of the entire row of battery cells 2. Since the battery cell 2 is rectangular, the area of ​​its side surface is larger than the area of ​​its top and bottom surfaces. In order to ensure heat conduction efficiency, this technology makes the side surface with the largest area of ​​the battery cell 2 attached to the liquid cooling plate 3, thereby maximizing the contact area between the battery cell 2 and the liquid cooling plate 3 and improving the heat exchange efficiency.

[0030] like Figure 2As shown, to balance heat dissipation efficiency and module volume, the liquid cooling plate 3 is made of high-strength aluminum alloy through extrusion molding. The flow channel cross-section is rectangular or trapezoidal, and the surface is anodized to enhance corrosion resistance. The outer shell thickness of the liquid cooling plate 3 is 2-5mm. The interior of the rectangular shell 1 has strip-shaped protrusions for separating adjacent rows of battery cells 2. The battery cells 2 are sandwiched between two strip-shaped protrusions, which also serve to limit the position of the battery cells 2. The liquid cooling plate 3 is fixed on the strip-shaped protrusions. The strip-shaped protrusions on the rectangular shell can be designed as a hollow structure. This part can achieve heat dissipation without the liquid cooling plate 3, thereby reducing the volume of the liquid cooling plate 3, increasing the transmission time of the liquid cooling medium in the liquid cooling plate 3, and thus improving the conversion efficiency of the liquid cooling plate 3.

[0031] The liquid cooling plate 3 has an inlet pipe 4 and an outlet pipe 5 on one side. The liquid cooling plate 3 contains a unidirectional flow channel for the liquid medium, with the inlet pipe 4 and outlet pipe 5 connected to its two ends respectively. The unidirectional flow channel within the liquid cooling plate 3 is either serpentine or parallel, and the coolant flow velocity is controlled at 0.5-2 m / s to optimize the heat transfer coefficient. The cooling medium is a 50% ethylene glycol aqueous solution, and the operating temperature range is -30℃ to 50℃.

[0032] The outer end of the liquid inlet branch pipe 4 is connected to the liquid inlet main pipe 6, and the outer end of the liquid outlet branch pipe 5 is connected to the liquid outlet main pipe 7. Both the liquid inlet main pipe 6 and the liquid outlet main pipe 7 are connected to the liquid cooling circulation system 8. Figure 3 As shown, for more precise control, each liquid outlet pipe 5 of the liquid cooling plate 3 is equipped with a temperature sensor 9 and a solenoid valve 10. The temperature sensor 9 is used to detect the liquid outlet temperature of the liquid cooling plate 3. When the temperature is lower than the temperature threshold, it means that the temperature inside the liquid cooling plate 3 has been reduced to a safe value, that is, the temperature of the battery cell 2 in contact with the liquid cooling plate 3 is in a safe range. The liquid cooling circulation system 8 will control the solenoid valve 10 to disconnect the liquid flow channel or reduce the flow rate, thereby indirectly increasing the liquid flow rate in other liquid cooling plates 3, so as to achieve precise cooling control of multiple flow channels.

[0033] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. An extruded side liquid cooling system for the large side surface of a lithium-ion battery, characterized in that: The device includes a rectangular housing, inside which are arranged several rows of battery cells arranged in parallel. A liquid cooling plate is provided on the side of each battery cell, and the liquid cooling plate is attached to the side of the entire row of battery cells. The liquid cooling plate is provided with an inlet pipe and an outlet pipe on one side, and a one-way flow channel for the liquid medium to flow is provided inside the liquid cooling plate. The two ends of the one-way flow channel are respectively connected to the inlet pipe and the outlet pipe. The outer end of the liquid inlet branch pipe is connected to the liquid inlet main pipe, and the outer end of the liquid outlet branch pipe is connected to the liquid outlet main pipe. Both the liquid inlet main pipe and the liquid outlet main pipe are connected to the liquid cooling circulation system.

2. The extruded side liquid cooling system for the large side surface of a lithium-ion battery according to claim 1, characterized in that: The battery cell is rectangular in shape, and the side with the largest area of ​​the battery cell is in contact with the liquid cooling plate.

3. The extruded side liquid cooling system for the large side surface of a lithium-ion battery according to claim 1, characterized in that: The outer shell thickness of the liquid cooling plate is 2-5mm.

4. The extruded side liquid cooling system for the large side surface of a lithium-ion battery according to claim 1, characterized in that: The unidirectional flow channel is either serpentine or parallel.

5. The extruded side liquid cooling system for the large side surface of a lithium-ion battery according to claim 1, characterized in that: The liquid cooling medium is an aqueous solution of ethylene glycol, with an operating temperature range of -30°C to 50°C.

6. The extruded side liquid cooling system for the large side surface of a lithium-ion battery according to claim 1, characterized in that: The rectangular housing has strip-shaped protrusions inside for separating adjacent rows of battery cells, and the liquid cooling plate is fixed on the strip-shaped protrusions.

7. The extruded side liquid cooling system for the large side surface of a lithium-ion battery according to claim 1, characterized in that: The rectangular outer shell is an aluminum alloy frame.

Images