Extruded side edge liquid cooling system for large side surface of lithium ion battery

Abstract

The utility model relates to the technical field of batteries, in particular to an extruded side edge liquid cooling system for a large side surface of a lithium ion battery. The system comprises a battery module, a liquid cooling plate assembly, a liquid cooling water inlet and outlet pipeline and a liquid cooling machine, the battery module comprises a plurality of uniformly arranged single battery cells, connecting strips for connecting the single battery cells and a battery fixing structure, and the liquid cooling plate assembly is arranged on the large side surface of each column of single battery cells and is connected with the liquid cooling machine through a liquid cooling water inlet and outlet pipeline; wherein the area of the liquid cooling plate assembly is equal to the area of the large side surface of each single battery cell * the number of the single battery cells, and the thickness of the liquid cooling plate assembly is 2-5mm. Through the system, the lithium ion battery can be better cooled.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an extruded side liquid cooling system for a large side surface of a lithium-ion battery. Background Art

[0002] Currently, in lithium-ion battery energy storage thermal management systems, liquid cooling systems primarily utilize a liquid cooling plate placed at the bottom of the battery cell. However, since the heat generated during charging and discharging is primarily concentrated on the pole side, and the warm airflow rises rather than converging at the bottom of the cell, the use of liquid cooling at the bottom of the cell is limited. In high-power, high-energy, and high-density applications, bottom-based liquid cooling systems not only struggle to maintain temperature differences within the battery pack, but also fail to guarantee the lifespan of the battery cell. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an extruded side liquid cooling system for the large side of a lithium-ion battery, through which the lithium-ion battery can be better cooled.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] A lithium-ion battery extruded side liquid cooling system includes a battery module, a liquid cooling plate assembly, liquid cooling inlet and outlet pipes, and a liquid cooling machine. The battery module includes a plurality of evenly arranged single cells, connecting bars connecting the single cells, and a battery fixing structure. The liquid cooling plate assembly is installed on the large side of each column of single cells and is connected to the liquid cooling machine via the liquid cooling inlet and outlet pipes. The liquid cooling machine can cool one or more battery modules.

[0006] Preferably, the liquid cooling area of a single liquid cooling plate assembly = the largest side area of a single row of single cells * the number of single row of single cells.

[0007] Preferably, the liquid cooling plate assembly includes at least two parallel and symmetrically arranged microchannel flat tubes, thermally conductive rubber pads covering both sides of the microchannel flat tubes, a water inlet collecting cover plate and a water outlet collecting cover plate installed on both ends of the microchannel flat tubes, and a liquid inlet nozzle installed on the water inlet collecting cover plate and a liquid outlet nozzle on the water outlet collecting cover plate, the liquid inlet nozzle being connected to the liquid outlet nozzle through the water inlet collecting cover plate, the microchannel flat tube and the water outlet collecting cover plate; wherein, the thickness of the microchannel flat tube is 3-5 mm, and the preferred value is 3.6 mm.

[0008] Preferably, the water inlet collecting cover plate includes a cover surface, a cover body arranged around the cover surface and a water inlet collecting space formed around it, and a water inlet is provided through the middle part of the cover body arranged along the length direction of the cover surface; a first flow bypass column, a second flow bypass column and a first dividing block are provided in the water inlet collecting space, the first flow bypass column and the second flow bypass column are arranged on the inner top surface of the water inlet collecting space and are located on both sides of the water inlet, the first dividing block is arranged on the inner bottom surface of the water inlet collecting space and is located directly below the water inlet, and the two ends of the first dividing block are integrally connected to the cover body arranged along the length direction of the cover surface.

[0009] Preferably, a water outlet and a water outlet collecting space are provided on the water outlet collecting cover plate, and the water outlet is provided through the thickness direction of the water outlet collecting cover plate.

[0010] Preferably, the liquid inlet nozzle is passed through the water inlet and connected to the water inlet collecting cover plate by welding; the liquid outlet nozzle is passed through the water outlet and connected to the water outlet collecting cover plate by welding.

[0011] Preferably, the liquid cooling plate assembly further comprises a flow bypass spacer, which is fixedly connected between the outlet collecting cover plate and the microchannel flat tube; preferably, a second partition block is provided in the middle of one side of the flow bypass spacer close to the microchannel flat tube, and the flow bypass spacer is divided into a first partition and a second partition by the second partition block.

[0012] Preferably, a plurality of flow channel baffles are provided in the microchannel flat tube, and the flow channel baffles are extended along the length direction of the microchannel flat tube; the flow channel baffles include short flow channel baffles and long flow channel baffles, the long flow channel baffles are the same length as the microchannel flat tube, the length of the short flow channel baffles is less than the length of the microchannel flat tube, and one end of the short flow channel baffle is flush with one end of the microchannel flat tube, and the other end is not flush.

[0013] Preferably, the number of long flow channel partitions in the microchannel flat tube is the number of short flow channel partitions divided by 2 and rounded up, or rounded up and added to 1; the first partition and the second partition are connected to the long flow channel partition, and the ratio of the number of separated short flow channel partitions is N:N or N+1:N.

[0014] Preferably, one end of the flow channel partition in the microchannel flat tube is welded and sealed to the water inlet collecting cover plate, and the other end is welded and sealed to the bypass spacer and then welded and sealed to the water outlet collecting cover plate; the microchannel flat tube is separated into a first part and a second part that are symmetrical in the upper and lower directions by the first dividing block and the second dividing block, and the first part and the second part are respectively formed through the first bypass column and the first spacer, the second bypass column and the second spacer, and the water inlet collecting cover plate and the water outlet collecting cover plate, respectively forming an S-shaped liquid flow channel.

[0015] In summary, the advantages of the present invention are as follows:

[0016] 1. This patent places the liquid cooling plate assembly on the large side of the single cell, which can provide more efficient battery thermal management;

[0017] 2. The structural design of the liquid cooling plate assembly enables the coolant flow to be evenly distributed, ensuring the overall temperature uniformity of the battery pack;

[0018] 3. Design appropriate liquid cooling plate flow channels to ensure that the flow resistance of the entire battery pack cooling system meets the usage scenario;

[0019] 4. The extrusion process is used to make the liquid cooling plate flow channel, which not only ensures the heat dissipation effect, but also reduces the production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of the battery pack and liquid cooler according to an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the exploded structure of a battery pack according to an embodiment of the present application;

[0022] Figure 3 This is a structural diagram of the liquid cooling plate assembly and the position of the single battery cell according to an embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of the structure of the liquid cooling plate assembly according to an embodiment of the present application;

[0024] Figure 5 This is a schematic diagram of the exploded structure of the liquid cooling plate assembly according to an embodiment of the present application;

[0025] Figure 6 This is a cross-sectional view of the internal fluid flow of the liquid cooling plate assembly according to an embodiment of the present application;

[0026] Figure 7 A schematic structural diagram of the inlet and outlet water manifold cover and the inlet and outlet liquid nozzles of the liquid cooling plate assembly provided in an embodiment of the present application;

[0027] Figure 8 This is a structural diagram of the position of the liquid cooling plate assembly and the thermal pad in an embodiment of the present application;

[0028] Figure 9 This is a schematic cross-sectional view of the water inlet end of the microchannel flat tube of the liquid cooling plate assembly of an embodiment of the present application;

[0029] Figure 10 This is a schematic cross-sectional view of the water outlet end of the microchannel flat tube of the liquid cooling plate assembly of an embodiment of the present application;

[0030] Figure 11 This is a schematic cross-sectional view of a water inlet manifold cover plate of a liquid cooling plate assembly according to an embodiment of the present application;

[0031] Figure 12 This is a schematic cross-sectional view of a water outlet manifold cover plate of a liquid cooling plate assembly according to an embodiment of the present application;

[0032] Figure 13 This is a schematic structural diagram of a flow-circulating spacer of a liquid cooling plate assembly according to an embodiment of the present application;

[0033] Figure numerals: 1. battery module; 2. liquid cooling plate assembly; 3. liquid cooling inlet and outlet pipes; 4. liquid cooling machine; 11. single battery cell; 21. microchannel flat tube; 22. water inlet collecting cover plate; 23. water outlet collecting cover plate; 24. liquid inlet nozzle; 25. liquid outlet nozzle; 26. bypass spacer; 27. thermal conductive rubber pad; 211. short flow channel partition; 212. long flow channel partition; 221. cover surface; 222. cover body; 223. water inlet collecting space; 224. water inlet; 225. first bypass column; 226. second bypass column; 227. first partition block; 231. water outlet; 232. water outlet collecting space; 261. second partition block; 262. first partition; 263. second partition. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0035] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0036] It should also be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0037] The following is a detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings.

[0038] like Figures 1 to 13The figure shows an extruded side liquid cooling system for the large side of a lithium-ion battery. The system includes: a battery module 1, a liquid cooling plate assembly 2 for maintaining a temperature differential within the battery module 1, liquid cooling inlet and outlet pipes 3 for flowing coolant into and out of the battery module 1, and a liquid cooler 4 for circulating the coolant to reduce the temperature. One liquid cooler 4 can simultaneously cool multiple battery modules 1.

[0039] like Figures 1 to 4 As shown, the battery module 1 includes several evenly arranged individual cells 11, connecting bars connecting the individual cells 11, and a battery mounting structure. The individual cells 11 can be arranged in one or more rows, with the liquid cooling plate assembly 2 installed on the large side surfaces (or both large side surfaces) of each row of individual cells 11. A liquid cooler 4 is located outside the battery module 1 and connected to the liquid cooling plate assembly 2 via liquid cooling inlet and outlet pipes 3.

[0040] In this embodiment, a liquid cooling plate assembly 2 is arranged on the large side of each battery cell 11, which can realize double-sided heat exchange of the battery cell 11. Specifically, each liquid cooling plate assembly 2 is closely attached to the large side of four battery cells on one side to cool the battery cell 11.

[0041] The size of the liquid cooling plate assembly 2 is determined according to the area of the single battery cell 11 in actual application and the number of single battery cells 11 to be covered. The specific length and width of the liquid cooling plate assembly 2 need to cover the large side surface of the single battery cell 11 battery, that is, the liquid cooling area of a single liquid cooling plate assembly 2 = the large side surface area of a single row of single battery cells 11 * the number of single row of single battery cells 11.

[0042] like Figures 5 to 9 As shown, the liquid cooling plate assembly 2 includes at least two parallel and symmetrical microchannel flat tubes 21, thermally conductive adhesive pads 27 covering both sides of the microchannel flat tubes 21, an inlet manifold cover 22 and an outlet manifold cover 23 mounted on both ends of the microchannel flat tubes 21, and a liquid inlet nozzle 24 mounted on the inlet manifold cover 22 and a liquid outlet nozzle 25 mounted on the outlet manifold cover 23. The liquid inlet nozzle 24 is connected to the liquid outlet nozzle 25 through the inlet manifold cover 22, the microchannel flat tubes 21, and the outlet manifold cover 23. The thickness of the microchannel flat tubes is 3-5 mm, preferably 3.6 mm.

[0043] like Figure 5 As shown, the liquid cooling plate assembly 2 further includes a flow separator 26, which is fixedly connected between the outlet manifold cover 23 and the microchannel flat tubes 21 and covers approximately two-thirds of the microchannel flat tubes 21. A second partition block 261 is provided in the middle of one side of the flow separator 26 near the microchannel flat tubes 21. The second partition block 261 divides the flow separator 26 into a first partition 262 and a second partition 263.

[0044] like Figure 5、 6 and Figure 13 As shown, the liquid cooling plate assembly 2 in this embodiment has two vertically symmetrical microchannel flat tubes 21. The first microchannel flat tube 21 and the second microchannel flat tube 21 are vertically symmetrically separated by a first partition block 227 and a second partition block 261.

[0045] like Figure 11 As shown, the water inlet manifold cover plate 22 includes a cover surface 221, a cover body 222 arranged around the cover surface 221, and a water inlet manifold space 223 formed therearound. A water inlet 224 is provided through the middle portion of the cover body 222, which is arranged along the length of the cover surface 221. A first flow column 225, a second flow column 226, and a first separator 227 are provided within the water inlet manifold space 223. The first and second flow columns 225, 226 are arranged on the inner top surface of the water inlet manifold space 223 and are located on either side of the water inlet 224. The first separator 227 is arranged on the inner bottom surface of the water inlet manifold space 223 and is located directly below the water inlet 224. The two ends of the first separator 227 are integrally connected to the cover body 222, which is arranged along the length of the cover surface 221. The liquid inlet nozzle 24 passes through the water inlet 224 and is connected to the water inlet manifold cover plate 22 by welding.

[0046] like Figure 12 As shown, the outlet manifold cover 23 is provided with an outlet 231 and an outlet manifold space 232. The outlet 231 is provided through the thickness direction of the outlet manifold cover 23. The liquid outlet nozzle 25 passes through the outlet 231 and is connected to the outlet manifold cover 23 by welding.

[0047] like Figure 6 、 9 As shown in Figure 10, a plurality of flow channel baffles are provided in the microchannel flat tube 21, and the flow channel baffles are extended along the length direction of the microchannel flat tube 21; the flow channel baffles include a short flow channel baffle 211 and a long flow channel baffle 212, the long flow channel baffle 212 is the same length as the microchannel flat tube 21, the length of the short flow channel baffle 211 is less than the length of the microchannel flat tube 21, and one end of the short flow channel baffle 211 is flush with one end of the microchannel flat tube 21, and the other end is not flush.

[0048] The number of long flow channel partitions 212 in the microchannel flat tube 21 is the number of short flow channel partitions 211 divided by 2 and rounded up, or rounded up and added to 1; the first partition 262 and the second partition 263 are connected to the long flow channel partition 212, and the ratio of the number of separated short flow channel partitions 211 is N:N or N+1:N.

[0049] One end of the flow channel partition in the microchannel flat tube 21 is welded and sealed to the water inlet collecting cover 22, and the other end is welded and sealed to the bypass spacer 26 and then welded and sealed to the water outlet collecting cover 23; the microchannel flat tube 21 is divided into a first part and a second part that are symmetrical in the upper and lower directions through the first dividing block 227 and the second dividing block 261. The first part and the second part are respectively formed through the first bypass column 225 and the first spacer 262, the second bypass column 226 and the second spacer 263, the water inlet collecting cover 22 and the water outlet collecting cover 23, thereby increasing the heat dissipation effect.

[0050] The liquid inlet channel of the liquid cooling plate assembly 2 is manufactured using an extrusion process, which not only ensures effective heat dissipation but also reduces production costs. Furthermore, the liquid cooling plate manufactured using the extrusion process is thinner, resulting in a higher degree of integration within the overall battery pack space.

[0051] The above-mentioned liquid cooling inlet and outlet water pipes 3 are made of plastic material, including water pipes between the inlet and outlet ports of the liquid cooler 4 and the liquid inlet nozzles 24 and the liquid outlet nozzles 25, water pipes between the liquid inlet nozzles 24 and the liquid outlet nozzles 25, and water pipes between the liquid outlet nozzles 25 and the liquid outlet nozzles 25.

[0052] Taking the first microchannel flat tube 21 of this embodiment as an example, the long channel baffles 212 are the same length as the microchannel flat tube 21. The short channel baffles 211 are 10 mm shorter than the microchannel flat tube 21. There are four long channel baffles 212 and six short channel baffles. The first spacer 262 is connected to the short channel baffles 211, separating them in a 3:3 ratio.

[0053] like Figure 1 、 6 As shown in the figure, the coolant achieves battery thermal management through the following circulation process:

[0054] The coolant flows out of the liquid cooler 4 and is filled into the liquid cooling plate assembly 2 in the battery pack along the liquid cooling water inlet and outlet pipes 3;

[0055] The coolant flows into the water inlet 224 along the liquid inlet nozzle 24, fills the water inlet manifold space 223 and flows into the multiple cooling channels in the length direction of the liquid cooling plate assembly 2;

[0056] The coolant flows into the first microchannel flat tube 21 and the second microchannel flat tube 21 respectively, enters the upper S-shaped flow channel and the lower S-shaped flow channel, and after flowing through a length, it splits and flows in opposite directions to realize S-shaped flow. After flowing through a length, it flows in the opposite direction again and gathers in the water outlet collecting space 232.

[0057] The coolant flows from the water outlet collecting space 232 through the water outlet 231 to the liquid outlet nozzle 25 , flows out of the battery pack along the liquid cooling water inlet and outlet pipes 3 , and enters the liquid cooler 4 for circulation.

[0058] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professional and technical personnel in the field can implement or use the present invention. Various modifications to these embodiments will be obvious to professional and technical personnel in the field. The general principles defined in this article can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A large side extrusion liquid cooling system for lithium-ion batteries, characterized in that: The system comprises a battery module (1), a liquid cooling plate assembly (2), liquid cooling water inlet and outlet pipes (3), and a liquid cooling machine (4); the battery module (1) comprises a plurality of evenly arranged single cells (11), a connecting bar connecting the single cells (11), and a battery fixing structure; the liquid cooling plate assembly (2) is arranged on the large side surface of each column of single cells (11) and is connected to the liquid cooling machine (4) via the liquid cooling water inlet and outlet pipes (3); wherein the liquid cooling machine (4) can cool down one or more battery modules (1).

2. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 1, characterized in that: The liquid cooling effect area of a single liquid cooling plate assembly (2) = the largest side area of a single row of single cells (11) * the number of single row of single cells (11).

3. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 2, characterized in that: The liquid cooling plate assembly (2) comprises at least two parallel and symmetrically arranged microchannel flat tubes (21), thermally conductive rubber pads (27) covering both sides of the microchannel flat tubes (21), a water inlet collecting cover plate (22) and a water outlet collecting cover plate (23) mounted on both ends of the microchannel flat tubes (21), and a liquid inlet nozzle (24) mounted on the water inlet collecting cover plate (22) and a liquid outlet nozzle (25) mounted on the water outlet collecting cover plate (23), wherein the liquid inlet nozzle (24) is connected to the liquid outlet nozzle (25) through the water inlet collecting cover plate (22), the microchannel flat tubes (21) and the water outlet collecting cover plate (23); wherein the thickness of the microchannel flat tubes (21) is 3-5 mm.

4. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 3, characterized in that: The thickness of the microchannel flat tube (21) is 3.6 mm.

5. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 3, characterized in that: The water inlet collecting cover plate (22) comprises a cover surface (221), a cover body (222) arranged around the cover surface (221), and a water inlet collecting space (223) formed around the cover surface (221). A water inlet (224) is provided through the middle of the cover body (222) arranged along the length direction of the cover surface (221); a first flow-circling column (225), a second flow-circling column (226), and a first dividing block (227) are provided in the water inlet collecting space (223). The first flow-circling column (225) and the second flow-circling column (226) are arranged on the inner top surface of the water inlet collecting space (223) and are located on both sides of the water inlet (224). The first dividing block (227) is arranged on the inner bottom surface of the water inlet collecting space (223) and is located directly below the water inlet (224). The two ends of the first dividing block (227) are integrally connected to the cover body (222) arranged along the length direction of the cover surface (221).

6. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 5, characterized in that: The water outlet and collecting cover plate (23) is provided with a water outlet (231) and a water outlet and collecting space (232), and the water outlet (231) is provided through the thickness direction of the water outlet and collecting cover plate (23).

7. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 6, characterized in that: The liquid inlet nozzle (24) passes through the water inlet (224) and is connected to the water inlet collecting cover plate (22) by welding; the liquid outlet nozzle (25) passes through the water outlet (231) and is connected to the water outlet collecting cover plate (23) by welding.

8. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 5, characterized in that: The liquid cooling plate assembly (2) further comprises a flow bypass spacer (26), wherein the flow bypass spacer (26) is fixedly connected between the water outlet collecting cover plate (23) and the microchannel flat tube (21).

9. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 8, characterized in that: A second partition block (261) is provided in the middle of one side of the bypass spacer (26) close to the microchannel flat tube (21), and the bypass spacer (26) is divided into a first partition block (262) and a second partition block (263) by the second partition block (261).

10. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 9, characterized in that: A plurality of flow channel baffles are provided in the microchannel flat tube (21), and the flow channel baffles are extended along the length direction of the microchannel flat tube (21); the flow channel baffles include a short flow channel baffle (211) and a long flow channel baffle (212); the long flow channel baffle (212) is the same length as the microchannel flat tube (21); the length of the short flow channel baffle (211) is less than the length of the microchannel flat tube (21); one end of the short flow channel baffle (211) is flush with one end of the microchannel flat tube (21), and the other end is not flush.

11. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 10, characterized in that: The number of long flow channel partitions (212) in the microchannel flat tube (21) is the number of short flow channel partitions (211) divided by 2 and rounded up, or rounded up and added to 1; the first partition (262) and the second partition (263) are connected to the long flow channel partition (212), and the ratio of the number of the separated short flow channel partitions (211) is N:N or N+1:N.

12. The extruded side liquid cooling system for a large side of a lithium-ion battery according to claim 11, characterized in that: One end of the flow channel partition in the microchannel flat tube (21) is welded and sealed to the water inlet collecting cover plate (22), and the other end is welded and sealed to the bypass spacer (26) and then welded and sealed to the water outlet collecting cover plate (23); the microchannel flat tube (21) is separated into a first part and a second part that are symmetrical in the axial direction by a first partition block (227) and a second partition block (261); the first part and the second part are respectively connected by a first bypass column (225) and a first spacer (262), a second bypass column (226) and a second spacer (263), as well as the water inlet collecting cover plate (22) and the water outlet collecting cover plate (23), to form an S-shaped liquid flow channel.

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