Lithium battery module containing bidirectional parallel flow channels

Abstract

The invention discloses a lithium battery module containing bidirectional parallel flow channels. The lithium battery module comprises lithium battery monomers and a liquid cooling plate which are sequentially arranged along the flowing direction of a coolant, wherein the liquid cooling plate forms a semi-closed s-shaped surrounding structure with an arc angle of 50.75 degrees on the battery monomers; the liquid cooling plate internally comprises two liquid cooling channels which are arranged in parallel and are opposite in flowing direction, each liquid cooling channel internally comprises a plurality of snake-shaped flow channels, and the widths of interval ribs between the snake-shaped flow channels are equal. As the flowing directions of coolants in the two liquid cooling channels are opposite, the average temperatures of fluids on different sections tend to be consistent, so that the temperature difference between single batteries of the lithium battery pack is reduced; and the interval ribs are arranged among the snake-shaped flow channels, so that the heat transfer is enhanced, and the highest temperature of the lithium battery monomer is further reduced.

Description

Technical Field

[0001] The present invention relates to a lithium battery heat dissipation technology, and in particular to a lithium battery module containing bidirectional parallel flow channels. Background Art

[0002] The new energy vehicle industry represented by electric vehicles has also been strongly supported by the country, because the advantages of electric vehicles in energy saving and low pollution are incomparable to traditional gasoline vehicles. Therefore, the arrival of the new energy vehicle era not only conforms to the national concept of energy conservation and emission reduction, but also can solve the current urgent problems of oil energy crisis and environmental pollution to a certain extent.

[0003] As the main power source of electric vehicles, the quality of power batteries determines the driving range, safety and service life of electric vehicles. With the strong support of governments around the world, the research and development of electric vehicles has developed rapidly, especially in the field of power batteries. Lithium-ion batteries are widely used as power sources due to their high energy density, high power density, low pollution, no memory effect, low self-discharge rate, and long cycle life.

[0004] Since the performance of electric vehicles depends on the performance of the battery pack, in order to fully utilize the performance of electric vehicles, it is necessary to ensure that the performance of the battery pack is fully utilized under various working conditions, and battery thermal management is to ensure its full performance. Under high temperature conditions, the substances on the internal plates of the battery are active, the electrochemical reaction is accelerated, causing the anode plate grid to corrode and the battery life to decay; under low temperature conditions, the internal resistance of the battery increases, the battery capacity and discharge voltage decrease, the electrochemical reaction decreases, and over-discharge is prone to occur, causing the battery life to decay; the temperature difference inside the battery pack is too large, which will cause the single cell to work at different temperatures for a long time, which will affect the battery's charge and discharge performance and service life, and also increase the difficulty and frequency of battery maintenance. Therefore, the optimal operating temperature of the lithium-ion battery of an electric vehicle is between 20 and 40°C, and the temperature difference between the batteries in the module does not exceed 5°C during normal operation.

[0005] During the flow of coolant in the traditional serpentine channel liquid cooling plate, the fluid continuously absorbs the heat of the battery, and its temperature gradually rises, causing the high temperature of the battery pack to be mainly concentrated in the rear half of the battery, with poor temperature uniformity, which affects the cycle life of the battery.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a lithium battery module containing bidirectional parallel flow channels to solve the above-mentioned technical problems existing in the prior art.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] The lithium battery module with bidirectional parallel flow channels of the present invention has lithium battery cells 1 arranged in sequence along the flow direction of the coolant, and the liquid cooling plate 2 forms a semi-enclosed S-shaped surrounding structure with an arc angle of 50.75° for the battery cells 1;

[0010] The liquid cooling plate 2 includes a liquid cooling channel 1 31 and a liquid cooling channel 2 32 which are arranged in parallel and have opposite coolant flow directions.

[0011] Compared with the prior art, the lithium battery module provided by the present invention with bidirectional parallel flow channels can make the average temperature of the fluid on different cross sections tend to be consistent, thereby reducing the temperature difference between the single cells of the lithium battery pack; due to the presence of spacer ribs between the serpentine flow channels, heat transfer is enhanced, thereby further reducing the maximum temperature of the lithium battery single cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 —Schematic diagram of the overall structure of a liquid cooling plate with bidirectional parallel flow channels surrounding the side of a lithium battery module;

[0013] Figure 2 —Schematic diagram of the overall structure of the liquid cooling channel in the liquid cooling plate with two-way parallel flow channels and four serpentine flow channels;

[0014] Figure 3 —Schematic diagram of the overall structure of the liquid cooling channel in the liquid cooling plate with two-way parallel flow channels and eight serpentine flow channels;

[0015] Figure 4 — Battery serial number and marking position along the flow path;

[0016] Figure 5 —Schematic diagram of the overall structure of a liquid cooling plate with a traditional serpentine flow channel surrounding the side of a lithium battery module;

[0017] Figure 6 —Schematic diagram of the overall structure of the liquid cooling channel in the liquid cooling plate with the traditional serpentine flow channel;

[0018] Figure 7 —Comparison of the temperature along the liquid cooling plate flow channel between lithium battery modules with traditional serpentine flow channels and bidirectional parallel flow channels and four serpentine flow channels;

[0019] Figure 8a , Figure 8b —A comparison diagram of the temperature of lithium battery cells between two lithium battery modules with traditional serpentine flow channels and one with bidirectional parallel flow channels and four serpentine flow channels;

[0020] Fig. 9 —Comparison of the maximum temperature of a lithium battery module with a traditional serpentine flow channel and a lithium battery module with a bidirectional parallel flow channel and four serpentine flow channels;

[0021] Fig.10—Comparison of the maximum temperature difference between single cells of a lithium battery module containing a traditional serpentine flow channel and a lithium battery module containing a bidirectional parallel flow channel and four serpentine flow channels;

[0022] Fig.11 —Comparison of the temperature along the liquid cooling plate flow channel between lithium battery modules with traditional serpentine flow channels and bidirectional parallel flow channels and eight serpentine flow channels;

[0023] Fig.12 —Comparison of the maximum temperature of a lithium battery module with a traditional serpentine flow channel and a lithium battery module with a bidirectional parallel flow channel and eight serpentine flow channels;

[0024] Fig.13 —Comparison of the maximum temperature difference between single cells of a lithium battery module with a traditional serpentine flow channel and a module with a bidirectional parallel flow channel and eight serpentine flow channels;

[0025] In the figure:

[0026] Lithium battery cell 1; liquid cooling plate 2; liquid cooling channels 3, 31, 32; water inlets 4, 41, 42; water outlets 5, 51, 52; serpentine flow channels 6, 61, 62, 63, 64, 65, 66, 67, 68; and spacer ribs 7. DETAILED DESCRIPTION

[0027] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0028] First, the terms that may be used in this article are explained as follows:

[0029] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0030] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0031] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0032] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0033] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0034] The contents not described in detail in the examples of the present invention belong to the prior art known to professionals in the field. If no specific conditions are specified in the examples of the present invention, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used in the examples of the present invention, they are all conventional products that can be purchased commercially.

[0035] The lithium battery module with bidirectional parallel flow channels of the present invention has lithium battery cells 1 arranged in sequence along the flow direction of the coolant, and the liquid cooling plate 2 forms a semi-enclosed S-shaped surrounding structure with an arc angle of 50.75° for the battery cells 1;

[0036] The liquid cooling plate 2 includes a liquid cooling channel 1 31 and a liquid cooling channel 2 32 which are arranged in parallel and have opposite coolant flow directions.

[0037] The water inlet 41 of the liquid cooling channel 1 31 and the water outlet 52 of the liquid cooling channel 2 32 are located on one side of the liquid cooling plate 2, and the water outlet 51 of the liquid cooling channel 1 31 and the water inlet 42 of the liquid cooling channel 2 32 are located on the other side of the liquid cooling plate 2;

[0038] The lengths of the liquid cooling channel 1 31 and the cooling channel 2 32 cover the entire battery pack.

[0039] The liquid cooling channel 1 31 includes a serpentine flow channel 1 61 and a serpentine flow channel 3 63 , and the liquid cooling channel 2 32 includes a serpentine flow channel 2 62 and a serpentine flow channel 4 64 .

[0040] The thickness of the four serpentine flow channels is 1 to 5 mm, and the width is 10 to 35 mm.

[0041] The width of the spacing ribs 7 between adjacent serpentine flow channels is 1 to 5 mm.

[0042] Since there are spacer ribs 7 between adjacent serpentine flow channels, heat transfer is enhanced and the maximum temperature of the lithium battery cell is reduced.

[0043] When the liquid cooling channel 1 31 is in the high temperature zone, the liquid cooling channel 2 32 is in the low temperature zone; when the liquid cooling channel 1 31 is in the medium temperature zone, the liquid cooling channel 2 32 is also in the medium temperature zone; when the liquid cooling channel 1 31 is in the low temperature zone, the liquid cooling channel 2 32 is in the high temperature zone; the average temperature of the fluid on different cross sections tends to be consistent, thereby reducing the temperature difference between the single cells of the lithium battery pack.

[0044] In summary, it can be seen that the lithium battery module containing bidirectional parallel flow channels in the embodiment of the present invention has a structure that reduces the temperature difference between single cells and lowers the maximum temperature by the following mechanism: since the coolant flows in the liquid cooling channels 31 and 32 in opposite directions, when the liquid cooling channel 31 is in the high temperature zone, the liquid cooling channel 32 is in the low temperature zone, when the liquid cooling channel 31 is in the medium temperature zone, the liquid cooling channel 32 is also in the medium temperature zone, and when the liquid cooling channel 31 is in the low temperature zone, the liquid cooling channel 32 is in the high temperature zone. Because the average temperatures of the fluids on different cross sections tend to be consistent, the temperature difference between the single cells of the lithium battery pack is reduced; since there are spacer ribs 7 between the serpentine flow channels 61-64, heat transfer is enhanced, thereby further reducing the maximum temperature of the lithium battery single cells.

[0045] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the embodiments of the present invention are described in detail with specific embodiments below.

[0046] like Figures 1 to 4 As shown:

[0047] A lithium battery module with bidirectional parallel flow channels, comprising lithium battery cells 1 arranged in sequence along the flow direction of the coolant, and a liquid cooling plate 2 with a semi-enclosed S-shaped structure with an arc angle of 50.75° surrounding the lithium battery cells 1. The liquid cooling plate 2 contains two liquid cooling channels 31 and 32 arranged in parallel and with opposite flow directions. The overall structure of the liquid cooling plate with bidirectional parallel flow channels surrounding the side of the lithium battery module is shown in FIG. Figure 1; The overall structure of the liquid cooling channel in the liquid cooling plate with two-way parallel flow channels and four serpentine flow channels can be found in Figure 2 ; The overall structure of the liquid cooling channel in the liquid cooling plate with two-way parallel flow channels and eight serpentine flow channels can be found in Figure 3 ; For battery serial number and flow path marking position, see Figure 4 . The liquid cooling effect of this structure is sufficiently reliable, so that the battery module has better temperature uniformity. The mechanism of this structure to reduce the temperature difference between single cells and lower the maximum temperature is: due to the opposite flow directions of the coolant in the liquid cooling channels 31 and 32, when the liquid cooling channel 31 is in the high temperature zone, the liquid cooling channel 32 is in the low temperature zone, when the liquid cooling channel 31 is in the medium temperature zone, the liquid cooling channel 32 is also in the medium temperature zone, and when the liquid cooling channel 31 is in the low temperature zone, the liquid cooling channel 32 is in the high temperature zone. Because the average temperature of the fluid on different cross sections tends to be consistent, the temperature difference between the single cells of the lithium battery pack is reduced; due to the presence of the spacer ribs 7 between the serpentine flow channels 61-64, the heat transfer is enhanced, thereby further reducing the maximum temperature of the lithium battery single cell.

[0048] The liquid cooling plate 2 includes two liquid cooling channels 31 and 32 which are arranged in parallel and flow in opposite directions. The water inlet 41 of the liquid cooling channel 31 and the water outlet 52 of the liquid cooling channel 32 are located on one side of the liquid cooling plate 2, and the water outlet 51 of the liquid cooling channel 31 and the water inlet 42 of the liquid cooling channel 32 are located on the other side of the liquid cooling plate 2; the length of the liquid cooling channels 31 and 32 covers the entire battery pack (see Figure 1 ).

[0049] The lithium battery module with bidirectional parallel flow channels described in the present invention is characterized in that the serpentine flow channels 61-64 have a thickness of 1 to 5 mm and a width of 10 to 35 mm.

[0050] The present invention discloses a lithium battery module with bidirectional parallel flow channels, characterized in that the liquid cooling channel 31 includes a serpentine flow channel 61 and a serpentine flow channel 63, and the liquid cooling channel 32 includes a serpentine flow channel 62 and a serpentine flow channel 64 (see Figure 2 ).

[0051] The lithium battery module with bidirectional parallel flow channels described in the present invention is characterized in that the serpentine flow channels 6 can be arranged in multiple numbers in the liquid cooling channel, and the width of the spacing ribs 7 between adjacent serpentine flow channels is 1 to 5 mm.

[0052] The following combination Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8a , Figure 8b , Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 , and the corresponding reference numerals and names in the accompanying drawings, further describe the implementation of the present invention in detail.

[0053] For a lithium battery module with a conventional serpentine flow channel, the overall structural diagram of the liquid cooling plate with a serpentine flow channel surrounding the side of the lithium battery module is shown in Figure 5 For the overall structural diagram of the liquid cooling channel in the liquid cooling plate with serpentine flow channel, see Figure 6 . Except for the liquid cooling plate, the rest of the structure is the same as the lithium battery module with a bidirectional parallel flow channel. There is only one liquid cooling channel in the liquid cooling plate, and the thickness of the channel is 1.6mm and the width is 63mm. When the traditional serpentine flow channel is used, the fluid continuously absorbs the heat of the battery during the flow of the coolant in the liquid cooling plate, and its temperature gradually increases, resulting in the high temperature of the battery pack being mainly concentrated in the rear half of the battery, and the temperature uniformity is poor. Based on this, the inventor invented a bidirectional parallel flow channel, which can make the average temperature of the fluid on different cross sections tend to be consistent, thereby reducing the temperature difference between the single cells of the lithium battery pack; due to the presence of spacer ribs between the serpentine flow channels, heat transfer is enhanced, thereby further reducing the maximum temperature of the lithium battery single cell.

[0054] In the following implementation cases, the implementation processes of "a lithium battery module containing bidirectional parallel flow channels and four serpentine flow channels" and "a lithium battery module containing bidirectional parallel flow channels and eight serpentine flow channels" are described in detail, and by comparing with a lithium battery module containing a traditional serpentine flow channel, it is verified that the bidirectional parallel flow channels proposed in the present invention can reduce the temperature difference between the single cells of the lithium battery pack and the maximum temperature of the lithium battery cells.

[0055] Example 1: Lithium battery module with two-way parallel flow channels and four serpentine flow channels

[0056] The structural parameters of the liquid cooling plate of the lithium battery module with bidirectional parallel flow channels and four serpentine flow channels in the embodiment are as follows:

[0057] The overall structure diagram of the liquid cooling plate with bidirectional parallel flow channels surrounding the side of the lithium battery module is shown in Figure 1 The overall structure diagram of the liquid cooling channel in the liquid cooling plate with two-way parallel flow channels and four serpentine flow channels is shown in Figure 2A lithium battery module with bidirectional parallel flow channels includes lithium battery cells 1 arranged in sequence along the flow direction of the coolant; the liquid cooling plate 2 is a semi-enclosed S-shaped structure with an arc angle of 50.75° surrounding the side of the battery, and the liquid cooling plate 2 includes two liquid cooling channels 31 and 32 arranged in parallel and with opposite flow directions, the water inlet 41 of the liquid cooling channel 31 and the water outlet 52 of the liquid cooling channel 32 are located on one side of the liquid cooling plate 2, the water outlet 51 of the liquid cooling channel 31 and the water inlet 42 of the liquid cooling channel 32 are located on the other side of the liquid cooling plate 2, and the length of the liquid cooling channels 31 and 32 covers the entire battery pack; the liquid cooling channel 31 includes two serpentine flow channels 61 and 63, and the liquid cooling channel 32 includes two serpentine flow channels 62 and 64.

[0058] The width of the spacing rib 7 between two adjacent serpentine flow channels is 1 mm.

[0059] The serpentine flow channels 61 - 64 have a thickness of 1.6 mm and a width of 17 mm.

[0060] Based on the structural parameters of this embodiment, numerical simulations were performed on a lithium battery module containing bidirectional parallel flow channels and four serpentine flow channels and a lithium battery module containing traditional serpentine flow channels when the flow rate Q was 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6 m3 / s. Figure 7 FIG8 is a temperature comparison diagram of the flow channel inside the lithium battery module with two-way parallel flow channels and four serpentine flow channels and the lithium battery module with traditional serpentine flow channels when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s. FIG9 is a temperature comparison diagram of the lithium battery cell in the lithium battery module with two-way parallel flow channels and four serpentine flow channels and the lithium battery module with traditional serpentine flow channels when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s. Fig. 9 The following is a comparison chart of the maximum temperature in a lithium battery module with two-way parallel flow channels and four serpentine flow channels and a lithium battery module with a traditional serpentine flow channel when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s. Fig.10 This is a comparison chart of the maximum temperature difference between the monomers of a lithium battery module containing bidirectional parallel flow channels and four serpentine flow channels and a lithium battery module containing traditional serpentine flow channels when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s.

[0061] Figure 7 The results show that the temperature distribution along the bidirectional parallel flow channel is more uniform than that along the traditional serpentine flow channel. Fig. 9The results show that when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s, the maximum temperature of the lithium battery module containing bidirectional parallel flow channels and four serpentine flow channels is 0.20%, 0.22%, 0.23%, and 0.25% lower than the maximum temperature of the flow channel of the traditional serpentine flow channel lithium battery module, respectively. Fig.10 The results show that when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s, the lithium battery module with two-way parallel flow channels and four serpentine flow channels is 67.53%, 67.28%, 66.97%, and 64.65% lower than the maximum temperature difference between battery cells in the traditional serpentine flow channel lithium battery module. It is verified that the lithium battery module with two-way parallel flow channels proposed by the present invention can improve the temperature uniformity in the channel, reduce the maximum temperature of the lithium battery cell and the temperature difference between the single cells of the lithium battery module.

[0062] Example 2: Lithium battery module with two-way parallel flow channels and eight serpentine flow channels

[0063] The overall structure diagram of the liquid cooling plate with bidirectional parallel flow channels surrounding the side of the lithium battery module is shown in Figure 1 The overall structure diagram of the liquid cooling channel in the liquid cooling plate with two-way parallel flow channels and eight serpentine flow channels is shown in Figure 3 .

[0064] The size and arrangement of the battery cells, liquid cooling plates and spacer ribs in Example 2 are the same as those in Example 1. The liquid cooling channel 31 includes serpentine channels 61, 63, 65, 67, and the liquid cooling channel 32 includes serpentine channels 62, 64, 66, 68. The serpentine channels 61-68 have a thickness of 1.6 mm and a width of 7 mm.

[0065] Based on the structural parameters of this embodiment, numerical simulations were performed on a lithium battery module containing bidirectional parallel flow channels and eight serpentine flow channels and a lithium battery module containing traditional serpentine flow channels at flow rates Q of 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6 m3 / s. Fig.11 The temperature comparison diagram of the flow channel inside the lithium battery module with two-way parallel flow channels and eight serpentine flow channels and the lithium battery module with traditional serpentine flow channels when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s. Fig.12 This is a comparison chart of the maximum temperature in a lithium battery module with two-way parallel flow channels and eight serpentine flow channels and a lithium battery module with a traditional serpentine flow channel when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s. Fig.13 This is a comparison chart of the maximum temperature difference between the monomers of a lithium battery module containing bidirectional parallel flow channels and eight serpentine flow channels and a lithium battery module containing traditional serpentine flow channels when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s.

[0066] Fig.11 The results show that the temperature distribution along the bidirectional parallel flow channel is more uniform than that along the traditional serpentine flow channel. Fig.12 The results show that when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s, the maximum temperature of the lithium battery module containing bidirectional parallel flow channels and eight serpentine flow channels is 0.22%, 0.21%, 0.20%, and 0.15% lower than the maximum temperature of the flow channel of the traditional serpentine flow channel lithium battery module. Fig.13 The results show that when the flow rate Q is 10.08×10-6, 8.064×10-6, 7.056×10-6, and 5.04×10-6m3 / s, the maximum temperature difference between battery cells in the lithium battery module with two-way parallel flow channels and four serpentine flow channels is reduced by 61.34%, 58.82%, 57.34%, and 52.59% respectively compared with the traditional serpentine flow channel lithium battery module. It is verified that the lithium battery module with two-way parallel flow channels proposed by the present invention can improve the temperature uniformity in the channel, reduce the maximum temperature of the lithium battery cell and the temperature difference between the single cells of the lithium battery module.

[0067] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A lithium battery module with bidirectional parallel flow channels, characterized in that: Lithium battery cells (1) are arranged in sequence along the flow direction of the coolant, and the liquid cooling plate (2) forms a semi-enclosed S-shaped surrounding structure with an arc angle of 50.75° for the battery cells (1); The liquid cooling plate (2) comprises a liquid cooling channel 1 (31) and a liquid cooling channel 2 (32) which are arranged in parallel and have opposite coolant flow directions.

2. The lithium battery module with bidirectional parallel flow channels according to claim 1, characterized in that: The water inlet (41) of the liquid cooling channel 1 (31) and the water outlet (52) of the liquid cooling channel 2 (32) are located on one side of the liquid cooling plate (2), and the water outlet (51) of the liquid cooling channel 1 (31) and the water inlet (42) of the liquid cooling channel 2 (32) are located on the other side of the liquid cooling plate (2); The lengths of liquid cooling channel 1 (31) and cooling channel 2 (32) cover the entire battery pack.

3. The lithium battery module with bidirectional parallel flow channels according to claim 2, characterized in that: Liquid cooling channel one (31) includes serpentine flow channel one (61) and serpentine flow channel three (63), and liquid cooling channel two (32) includes serpentine flow channel two (62) and serpentine flow channel four (64).

4. The lithium battery module with bidirectional parallel flow channels according to claim 3, characterized in that: The thickness of the four serpentine flow channels is 1 to 5 mm, and the width is 10 to 35 mm.

5. The lithium battery module with bidirectional parallel flow channels according to claim 4, characterized in that: The width of the spacing ribs 7 between adjacent serpentine flow channels is 1 to 5 mm.

6. The lithium battery module with bidirectional parallel flow channels according to claim 5, characterized in that: Since there are spacer ribs 7 between adjacent serpentine flow channels, heat transfer is enhanced and the maximum temperature of the lithium battery cell is reduced.

7. The lithium battery module with bidirectional parallel flow channels according to any one of claims 1 to 6, characterized in that: When the liquid cooling channel 1 (31) is in the high temperature zone, the liquid cooling channel 2 (32) is in the low temperature zone; when the liquid cooling channel 1 (31) is in the medium temperature zone, the liquid cooling channel 2 (32) is also in the medium temperature zone; when the liquid cooling channel 1 (31) is in the low temperature zone, the liquid cooling channel 2 (32) is in the high temperature zone; the average temperature of the fluid on different cross sections tends to be consistent, thereby reducing the temperature difference between the single cells of the lithium battery pack.

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