Battery module and battery pack

Abstract

The utility model provides a battery module and a battery pack. The battery module comprises a battery cell assembly, an end plate assembly and a liquid cooling assembly, in the embodiment of the invention, a first liquid cooling cavity positioned in a first end plate is communicated with a second liquid cooling cavity positioned on a liquid cooling plate, and a liquid inlet and a liquid outlet are also formed in the first end plate, so that a liquid cooling circulation loop in the battery module is formed, and a plurality of battery cells are cooled; the liquid cooling plate is arranged between the two adjacent battery cells, and the first end plate is arranged on one side of the battery cell assembly in the first direction, namely, the first end plate is in contact with the adjacent battery cell, so that the overall heat dissipation of the plurality of battery cells in the battery cell assembly is uniform, and the heat dissipation efficiency of the battery cell assembly is improved. And the temperature difference of each part of the battery cell is reduced, so that the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery module and a battery pack. Background Art

[0002] In the related art, the battery module dissipates heat naturally at room temperature, that is, there is no cooling structure in the battery module to cool the battery cell. The use of room temperature heat dissipation results in poor heat dissipation of the battery module. When the battery module is integrated into the battery pack, the liquid cooling plate in the battery pack is usually placed at the bottom of multiple battery modules connected in series or in parallel, and the gap between the liquid cooling plate and the battery module is filled with thermal conductive silicone grease for heat conduction. Since the liquid cooling plate is in contact with the bottom of the battery cell, it can only conduct away the heat generated by the lower part of the battery cell, but the heat dissipation area is small, and the heat generated by the upper part of the battery cell cannot be transferred to the lower part in time, resulting in a large temperature difference between the upper and lower parts of the battery, which is not conducive to safe use and affects the service life of the battery cell. Utility Model Content

[0003] The embodiments of the utility model provide a battery module and a battery pack, which can improve the technical problem in the related art that the battery cells in the battery module have a large temperature difference between the upper and lower parts of the battery cells due to uneven heat dissipation, thereby affecting the service life of the battery cells.

[0004] In a first aspect, an embodiment of the present utility model provides a battery module comprising:

[0005] A battery cell assembly, comprising a plurality of battery cells, wherein the plurality of battery cells are arranged along a first direction, and two adjacent battery cells are spaced apart from each other;

[0006] an end plate assembly, comprising a first end plate, the first end plate being located on one side of the plurality of battery cells in the first direction, a first liquid cooling cavity being arranged in the first end plate, a liquid inlet and a liquid outlet being arranged on the first end plate, the liquid inlet and the liquid outlet being both connected to the first liquid cooling cavity; and,

[0007] A liquid cooling assembly, comprising at least one liquid cooling plate, wherein the liquid cooling plate is arranged between any two adjacent battery cells, and a second liquid cooling cavity is arranged in the liquid cooling plate;

[0008] Wherein, the first liquid cooling chamber is communicated with the second liquid cooling chamber.

[0009] In one embodiment, the end plate assembly further includes a second end plate, and the first end plate and the second end plate are respectively located on both sides of the plurality of battery cells in the first direction;

[0010] A third liquid cooling cavity is disposed in the second end plate, and the third liquid cooling cavity is communicated with the first liquid cooling cavity.

[0011] In one embodiment, the first liquid cooling chamber includes a first sub-liquid cooling chamber and a second sub-liquid cooling chamber, the first sub-liquid cooling chamber and the second sub-liquid cooling chamber are spaced from each other, the first sub-liquid cooling chamber is connected to the liquid inlet, and the second sub-liquid cooling chamber is connected to the liquid outlet;

[0012] The first end plate is further provided with a first communication port and a second communication port, the first communication port is communicated with the first sub-liquid cooling cavity, and the second sub-liquid cooling cavity is communicated with the second communication port;

[0013] The liquid cooling plate is provided with a first liquid inlet and a first liquid outlet, and the first liquid inlet and the first liquid outlet are both connected to the second liquid cooling cavity;

[0014] A second liquid inlet and a second liquid outlet are provided on the second end plate, and the second liquid inlet and the second liquid outlet are both connected to the third liquid cooling chamber;

[0015] Wherein, the first communication port is communicated with the first liquid inlet and the second liquid inlet, and the second communication port is communicated with the first liquid outlet and the second liquid outlet.

[0016] In one embodiment, the liquid cooling assembly further includes a liquid inlet pipeline and a liquid outlet pipeline;

[0017] Wherein, the first communication port is communicated with the first liquid inlet and the second liquid inlet through the liquid inlet pipeline; the second communication port is communicated with the first liquid outlet and the second liquid outlet through the liquid outlet pipeline.

[0018] In one embodiment, the battery module includes a first mounting side and a second mounting side opposite to the first mounting side in a second direction, and the first direction and the second direction intersect each other;

[0019] In the second direction, the vertical distance from the first liquid inlet to the plane where the second mounting side is located is smaller than the vertical distance from the first liquid outlet to the plane where the second mounting side is located; the vertical distance from the second liquid inlet to the plane where the second mounting side is located is smaller than the vertical distance from the second liquid outlet to the plane where the second mounting side is located.

[0020] In one embodiment, the maximum size of the first liquid cooling cavity in the second direction is defined as H1, the maximum size of the second liquid cooling cavity in the second direction is defined as H2, the maximum size of the third liquid cooling cavity in the second direction is defined as H3, the size of the battery cell in the second direction is defined as H4, and the first direction and the second direction intersect each other; wherein H1, H2, H3 and H4 satisfy:

[0021] 0.75H4≤H1≤0.80H4;

[0022] 0.75H4≤H2≤0.80H4; and,

[0023] 0.75H4≤H3≤0.80H4.

[0024] In one embodiment, the plurality of battery cells are arranged in sequence along the first direction.

[0025] In one embodiment, the thickness of the liquid cooling plate in the first direction is defined as D; wherein D satisfies: 12 cm ≤ D ≤ 13 cm.

[0026] In one embodiment, the battery module further comprises a thermally conductive adhesive;

[0027] Wherein, the thermal conductive adhesive is arranged between the battery core and the liquid cooling plate, and between the battery core and the first end plate.

[0028] In a second aspect, an embodiment of the present invention provides a battery pack, which includes a battery module.

[0029] Beneficial effects of the embodiments of the utility model:

[0030] In an embodiment of the present application, the liquid cooling plate is provided between two adjacent battery cells, and the first end plate is provided on one side of the plurality of battery cells in the first direction; wherein the first liquid cooling cavity located in the first end plate is connected to the second liquid cooling cavity located on the liquid cooling plate, and the first end plate is also provided with the liquid inlet and the liquid discharge port, the cooling liquid enters the first liquid cooling cavity from the liquid inlet, and then enters the second liquid cooling cavity from the first liquid cooling cavity, the cooling liquid circulates in the second liquid cooling cavity to the first liquid cooling cavity and is discharged from the liquid discharge port to form a liquid cooling circulation loop in the battery module, thereby dissipating heat for the plurality of battery cells; the first end plate is provided on one side of the battery cell assembly in the first direction, that is, the first end plate is in contact with an adjacent one of the battery cells, and at the same time, since the liquid cooling plate is provided between two adjacent battery cells, the overall heat dissipation of the plurality of battery cells in the battery cell assembly is uniform, that is, the temperature difference between various parts of the battery cells is reduced, thereby improving the service life of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1It is a three-dimensional schematic diagram of a battery module provided by an embodiment of the utility model;

[0033] Figure 2 It is a structural schematic diagram of a battery module provided by an embodiment of the utility model from one perspective;

[0034] Figure 3 is a structural schematic diagram of a battery module provided by an embodiment of the utility model from another perspective;

[0035] Figure 4 It is a structural schematic diagram of a battery module provided by an embodiment of the utility model from another perspective;

[0036] Figure 5 is a cross-sectional schematic diagram of a first end plate provided in an embodiment of the utility model;

[0037] Figure 6 is a cross-sectional schematic diagram of a first end plate provided in an embodiment of the utility model;

[0038] Figure 7 is a cross-sectional schematic diagram of a liquid cooling plate provided in an embodiment of the utility model;

[0039] Figure 8 is a cross-sectional schematic diagram of a liquid cooling plate provided in an embodiment of the utility model;

[0040] Fig. 9 is a cross-sectional schematic diagram of a second end plate provided in an embodiment of the utility model;

[0041] Fig.10 It is a schematic diagram of the structure of a battery cell provided in an embodiment of the utility model.

[0042] Reference numerals:

[0043] 1000, battery module; 1, battery cell assembly; 11, battery cell; 2, end plate assembly; 21, first end plate; 211, first liquid cooling chamber; 212, liquid inlet; 213, liquid outlet; 3, liquid cooling assembly; 31, liquid cooling plate; 311, second liquid cooling chamber; 22, second end plate; 221, third liquid cooling chamber; 2111, first sub-liquid cooling chamber; 2112, second sub-liquid cooling chamber; 214, first connecting port; 215, third Two connecting ports; 312, first liquid inlet; 313, first liquid outlet; 222, second liquid inlet; 223, second liquid outlet; 32, liquid inlet pipeline; 33, liquid outlet pipeline; 1A, first installation side; 1B, second installation side; 4, thermal conductive adhesive; 5, bus bar; 6, wiring harness; 7, tightening tape; 211A, first sub-channel; 211B, second sub-channel; 221A, third sub-channel; 311A, fourth sub-channel. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the utility model, and are not used to limit the utility model. In the utility model, unless otherwise stated, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.

[0045] In the related art, the battery module dissipates heat naturally at room temperature, that is, there is no cooling structure in the battery module to cool the battery cell. The use of room temperature heat dissipation results in poor heat dissipation of the battery module. When the battery module is integrated into the battery pack, the liquid cooling plate in the battery pack is usually placed at the bottom of multiple battery modules connected in series or in parallel, and the gap between the liquid cooling plate and the battery module is filled with thermal conductive silicone grease for heat conduction. Since the liquid cooling plate is in contact with the bottom of the battery cell, it can only conduct away the heat generated by the lower part of the battery cell, but the heat dissipation area is small, and the heat generated by the upper part of the battery cell cannot be transferred to the lower part in time, resulting in a large temperature difference between the upper and lower parts of the battery, which is not conducive to safe use and affects the service life of the battery cell.

[0046] In view of this, the utility model proposes a battery module. Figures 1 to 10 This is an embodiment of the present utility model. Figures 1 to 10 As shown, the X direction is the first direction, the Z direction is the second direction, and the Y direction is the third direction. The angles between the first direction, the second direction, and the third direction are not limited, and can be 80°, 85°, 90°, 95°, or 100°; preferably, in the following embodiments, the angles between the first direction, the second direction, and the third direction are 90°; it should be emphasized that the angles between the first direction, the second direction, and the third direction are 90°, which does not constitute a limitation on the following embodiments of the present application.

[0047] See also Figure 1 , Figure 3 , Figure 5 as well as Figure 7The battery module 1000 includes a battery cell assembly 1, an end plate assembly 2 and a liquid cooling assembly 3, wherein the battery cell assembly 1 includes a plurality of battery cells 11, wherein the plurality of battery cells 11 are arranged along a first direction X, and two adjacent battery cells 11 are spaced apart from each other; the end plate assembly 2 includes a first end plate 21, wherein the first end plate 21 is located on one side of the plurality of battery cells 11 in the first direction X, wherein a first liquid cooling cavity 211 is disposed in the first end plate 21, wherein a liquid inlet 212 and a liquid outlet 213 are provided on the first end plate 21, wherein the liquid inlet 212 and the liquid outlet 213 are both connected to the first liquid cooling cavity 211; the liquid cooling assembly 3 includes at least one liquid cooling plate 31, wherein the liquid cooling plate 31 is disposed between any two adjacent battery cells 11, wherein a second liquid cooling cavity 311 is disposed in the liquid cooling plate 31; wherein the first liquid cooling cavity 211 is connected to the second liquid cooling cavity 311.

[0048] In an embodiment of the present application, the liquid cooling plate 31 is provided between two adjacent battery cells 11, and the first end plate 21 is provided on one side of the plurality of battery cells 11 in the first direction X; wherein the first liquid cooling cavity 211 located in the first end plate 21 is communicated with the second liquid cooling cavity 311 located on the liquid cooling plate 31, and the first end plate 21 is further provided with the liquid inlet 212 and the liquid discharge port 213, the cooling liquid enters the first liquid cooling cavity 211 from the liquid inlet 212, and then enters the second liquid cooling cavity 311 from the first liquid cooling cavity 211, and the cooling liquid enters the second liquid cooling cavity 311 in the second liquid cooling cavity 311. The cold chamber 311 circulates into the first liquid cooling chamber 211 and is discharged from the drain port 213 to form a liquid cooling circulation loop in the battery module 1000, thereby dissipating heat for the plurality of battery cells 11; the first end plate 21 is arranged on one side of the battery cell assembly 1 in the first direction X, that is, the first end plate 21 is in contact with an adjacent battery cell 11, and at the same time, since the liquid cooling plate 31 is arranged between two adjacent battery cells 11, the overall heat dissipation of the plurality of battery cells 11 in the battery cell assembly 1 is uniform, that is, the temperature difference at various locations of the battery cell 11 is reduced, thereby increasing the service life of the battery cell 11.

[0049] In one embodiment of the present application, the plurality of battery cells 11 are arranged in sequence along the first direction X, that is, the first end plate 21 is in contact with one of the battery cells 11; wherein the battery cell 11 in contact with the first end plate 21 is also in contact with the liquid cooling plate 31, thereby heat can be dissipated simultaneously on both sides of the battery cell 11 in the first direction X, thereby improving the uniformity of the overall heat dissipation of the battery cell 11.

[0050] Furthermore, there is no limit to the number of the liquid cooling plates 31, which can be one or more. When there are two battery cells 11 arranged in the battery module 1000, the liquid cooling plate 31 is provided as one and is located between two adjacent battery cells 11. When there are two or more battery cells 11 arranged in the battery module 1000, the liquid cooling plate 31 is provided as multiple and is respectively located between two adjacent battery cells 11.

[0051] It should be added that, since the two opposite sides of the battery core 11 in the first direction X have larger areas, heat is dissipated from the two opposite sides of the battery core 11 in the first direction X to ensure uniformity of the overall heat dissipation of the battery core 11 .

[0052] See also Figure 2 In some embodiments of the present application, the thickness of the liquid cooling plate 31 in the first direction X is defined as D; wherein D satisfies: 12cm≤D≤13cm. The D value is set within this range to meet the heat dissipation requirements of the liquid cooling plate 31 between the two adjacent battery cells 11. If the D value is less than 12cm, the volume of the second liquid cooling cavity 311 set in the liquid cooling plate 31 is too small, thereby affecting the heat dissipation effect of the liquid cooling plate 31 on the battery cells 11. If the D value is greater than 13cm, the thickness of the liquid cooling plate 31 in the first direction X is too thick, thereby affecting the assembly and molding of the battery module 1000.

[0053] See also Figure 1 , Figure 3 , Figure 5 , Figure 7 as well as Fig. 9 In some embodiments of the present application, the end plate assembly 2 further includes a second end plate 22, and the first end plate 21 and the second end plate 22 are respectively located on both sides of the plurality of battery cells 11 in the first direction X; a third liquid cooling cavity 221 is provided in the second end plate 22, and the third liquid cooling cavity 221 is connected with the first liquid cooling cavity 211. That is, in this embodiment, the third liquid cooling cavity 221 in the second end plate 22 can dissipate heat for at least one of the battery cells 11 adjacent thereto, thereby improving the overall heat dissipation uniformity of at least one of the battery cells 11 adjacent to the second end plate 22. The coolant can enter the first liquid cooling cavity 211 from the liquid inlet 212, flow from the first liquid cooling cavity 211 into the third liquid cooling cavity 221, and then flow back from the third liquid cooling cavity 221 to the first liquid cooling cavity 211, and finally be discharged from the drain port 213.

[0054] Among them, the first liquid cooling chamber 211 is connected to the second liquid cooling chamber 311, and the first liquid cooling chamber 211 is also connected to the third liquid cooling chamber 221, and the connection form of the second liquid cooling chamber 311 and the third liquid cooling chamber 221 is not limited; in one embodiment, the second liquid cooling chamber 311 and the third liquid cooling chamber 221 are connected in series; in another embodiment, the second liquid cooling chamber 311 and the third liquid cooling chamber 221 are connected in parallel.

[0055] In some embodiments of the present application, the first liquid-cooling chamber 211 includes a first sub-liquid-cooling chamber 2111 and a second sub-liquid-cooling chamber 2112, the first sub-liquid-cooling chamber 2111 and the second sub-liquid-cooling chamber 2112 are spaced from each other, the first sub-liquid-cooling chamber 2111 is connected to the liquid inlet 212, and the second sub-liquid-cooling chamber 2112 is connected to the liquid outlet 213; the first end plate 21 is further provided with a first connecting port 214 and a second connecting port 215, the first connecting port 214 is connected to the first sub-liquid-cooling chamber 2111, and the second sub-liquid-cooling chamber 2112 is connected to the second connecting port 215 The liquid cooling plate 31 is provided with a first liquid inlet 312 and a first liquid outlet 313, and the first liquid inlet 312 and the first liquid outlet 313 are both connected to the second liquid cooling cavity 311; the second end plate 22 is provided with a second liquid inlet 222 and a second liquid outlet 223, and the second liquid inlet 222 and the second liquid outlet 223 are both connected to the third liquid cooling cavity 221; wherein the first connecting port 214 is connected to the first liquid inlet 312 and the second liquid inlet 222, and the second connecting port 215 is connected to the first liquid outlet 313 and the second liquid outlet 223. That is, in this embodiment, the flow path of the cooling liquid in the first end plate 21, the liquid cooling plate 31 and the second end plate 22 is described as follows: the cooling liquid enters the first liquid cooling chamber 211 from the liquid inlet 212, and enters the first liquid inlet 312 and the second liquid inlet 222 through the first connecting port 214, that is, enters the second liquid cooling chamber 311 and the third liquid cooling chamber 221, the cooling liquid in the second liquid cooling chamber 311 and the third liquid cooling chamber 221 flows out from the first liquid outlet 313 and the second liquid outlet 223 respectively, and enters the second sub-liquid cooling chamber 2112 through the second connecting port 215, and the cooling liquid in the second sub-liquid cooling chamber 2112 is discharged from the drain port 213 to complete the circulation of the cooling liquid in the battery module 1000.

[0056] Among them, the first liquid-cooling chamber 211 is partitioned into the first sub-liquid-cooling chamber 2111 and the second sub-liquid-cooling chamber 2112 which are independent of each other, so that the coolant flowing from the first sub-liquid-cooling chamber 2111 into the second liquid-cooling chamber 311 and the third liquid-cooling chamber 221, and the coolant flowing back from the second liquid-cooling chamber 311 and the third liquid-cooling chamber 221 to the second sub-liquid-cooling chamber 2112 will not be mixed, thereby affecting the cooling effect of the coolant on the battery cell assembly 1.

[0057] In some embodiments of the present application, the liquid cooling assembly 3 further includes a liquid inlet pipeline 32 and a liquid outlet pipeline 33; wherein the first communication port 214 is connected with the first liquid inlet 312 and the second liquid inlet 222 through the liquid inlet pipeline 32; and the second communication port 215 is connected with the first liquid outlet 313 and the second liquid outlet 223 through the liquid outlet pipeline 33. That is, in this embodiment, the communication between the first communication port 214, the first liquid inlet 312 and the second liquid inlet 222 is completed by providing the liquid inlet pipeline 32, and the communication between the second communication port 215, the first liquid outlet 313 and the second liquid outlet 223 is completed by providing the liquid outlet pipeline 33. Based on the embodiment in which the liquid cooling plate 31 is provided with multiple liquids, the first liquid inlet 312 and the first liquid outlet 313 are also provided with multiple liquids, and the liquid inlet pipeline 32 is connected with multiple first liquid inlets 312, and the liquid outlet pipeline 33 is connected with multiple first liquid outlets 313.

[0058] In some embodiments of the present application, the liquid inlet pipeline 32 and the liquid outlet pipeline 33 are respectively located on opposite sides of the battery cell assembly 1 in the third direction Y, and the liquid inlet pipeline 32 and the liquid outlet pipeline 33 are also extended along the first direction X.

[0059] See also Figure 4 , Figure 7 as well as Fig. 9The battery module 1000 includes a first mounting side 1A and a second mounting side 1B opposite to the first mounting side 1A in a second direction Z; in the second direction Z, a vertical distance from the first liquid inlet 312 to a plane where the second mounting side 1B is located is smaller than a vertical distance from the first liquid outlet 313 to a plane where the second mounting side 1B is located; a vertical distance from the second liquid inlet 222 to a plane where the second mounting side 1B is located is smaller than a vertical distance from the second liquid outlet 223 to a plane where the second mounting side 1B is located. That is, in this embodiment, since the first liquid inlet 312 and the first liquid outlet 313 on the liquid cooling plate 31 are both connected to the second liquid cooling chamber 311, and the second liquid inlet 222 and the second liquid outlet 223 on the second end plate 22 are both connected to the third liquid cooling chamber 221, the height position of the first liquid inlet 312 in the second direction Z is set to be smaller than the height position of the first liquid outlet 313 in the second direction Z, so as to prevent the coolant in the second liquid cooling chamber 311 from flowing out from the first liquid outlet 313 before filling the second liquid cooling chamber 311, and the height position of the second liquid inlet 222 in the second direction Z is set to be smaller than the height position of the second liquid outlet 223 in the second direction Z, so as to prevent the coolant in the third liquid cooling chamber 221 from flowing out from the second liquid outlet 223 before filling the third liquid cooling chamber 221. This ensures that sufficient coolant can be accumulated in the liquid cooling plate 31 and the second end plate 22, thereby improving the heat dissipation capacity of the battery cell 11. In addition, in an embodiment of the present application, a wiring harness 6 and a bus bar 5 are also provided on the first installation side 1A.

[0060] See also Figure 6 , Figure 8 , Fig. 9 as well as Fig.10, define the maximum size of the first liquid-cooling cavity 211 in the second direction Z as H1, the maximum size of the second liquid-cooling cavity 311 in the second direction Z as H2, the maximum size of the third liquid-cooling cavity 221 in the second direction Z as H3, the size of the battery cell 11 in the second direction Z as H4, and the first direction X and the second direction Z intersect with each other; wherein, H1, H2, H3 and H4 satisfy: 0.75H4≤H1≤0.80H4; 0.75H4≤H2≤0.80H4; and, 0.75H4≤H3≤0.80H4. In this embodiment, the H1 value, the H2 value, and the H3 value are set within this interval so that the first liquid cooling chamber 211, the second liquid cooling chamber 311, and the third liquid cooling chamber 221 can meet the heat dissipation requirements of the battery cell 11; the above can be understood as such a setting so that the area of ​​the first liquid cooling chamber 211, the second liquid cooling chamber 311, and the third liquid cooling chamber 221 projected onto the battery cell 11 in the first direction X is large enough to meet the heat dissipation requirements of the battery cell 11. If the H1 value, the H2 value, and the H3 value are less than 0.75H4, the heat dissipation capacity of the first end plate 21, the second end plate 22, and the liquid cooling plate 31 for the battery cell 11 will be affected; in addition, due to the length limitation of the first end plate 21, the second end plate 22, and the liquid cooling plate 31 in the second direction Z, the H1 value, the H2 value, and the H3 value are less than or equal to 0.80H5.

[0061] See also Figure 1 and Fig.10 , the battery module 1000 also includes a thermally conductive adhesive 4; wherein the thermally conductive adhesive 4 is provided between the battery cell 11 and the liquid cooling plate 31, and between the battery cell 11 and the first end plate 21. That is, by providing the thermally conductive adhesive 4, the heat conduction capacity between the battery cell 11 and the first end plate 21, and between the battery cell 11 and the liquid cooling plate 31 is improved. In a specific embodiment of the present application, the thermally conductive adhesive 4 is coated on two opposite surfaces of the battery cell 11 in the first direction X, and is spaced 1 cm from the periphery of the surface of the battery cell 11 in the first direction X where the coating is located. In addition, in another embodiment of the present application, the thermally conductive adhesive 4 is also provided between the battery cell 11 and the second end plate 22.

[0062] See also Figure 5In some embodiments of the present application, the first sub-liquid-cooling chamber 2111 includes a plurality of first sub-flow channels 211A spaced apart from each other in the third direction Y, the first sub-flow channels 211A extend along the second direction Z, and the plurality of first sub-flow channels 211A are interconnected; the second sub-liquid-cooling chamber 2112 includes a plurality of second sub-flow channels 211B spaced apart from each other in the third direction Y, the second sub-flow channels 211B extend along the second direction Z, and the plurality of second sub-flow channels 211B are interconnected.

[0063] See also Fig. 9 In some embodiments of the present application, the third liquid cooling chamber 221 includes a plurality of third sub-channels 221A spaced apart from each other in the third direction Y, the third sub-channels 221A extend along the second direction Z, and the plurality of third sub-channels 221A are interconnected.

[0064] See also Figure 7 The second liquid cooling chamber 311 includes a plurality of fourth sub-channels 311A ​​spaced apart from each other in the second direction Z, the fourth sub-channels 311A ​​extend along the third direction Y, and the plurality of fourth sub-channels 311A ​​are interconnected.

[0065] The specific extension trajectories of the first sub-channel 211A, the second sub-channel 211B, the third sub-channel 221A and the fourth sub-channel 311A ​​are not limited, and can be arranged in a straight line, or in a continuous curved arrangement, or in a special shape. In a specific embodiment of the present application, the first sub-channel 211A, the second sub-channel 211B, the third sub-channel 221A and the fourth sub-channel 311A ​​are all arranged in a continuous curved arrangement to increase the flow path of the coolant in the first sub-channel 211A, the second sub-channel 211B, the third sub-channel 221A and the fourth sub-channel 311A.

[0066] See also Figure 1 , Figure 2 and Figure 4 In one embodiment of the present application, the battery module 1000 further includes a fastening belt 7, which is arranged around the first end plate 21, the second end plate 22 and the plurality of battery cells 11 to fasten the first end plate 21, the second end plate 22 and the plurality of battery cells 11; specifically, two fastening belts 7 are provided and are arranged at intervals along the second direction Z. On this basis, the liquid inlet pipeline 32 and the liquid outlet pipeline 33 are located between the two fastening belts 7 to avoid interference between the installation of the liquid inlet pipeline 32, the liquid outlet pipeline 33 and the two fastening belts 7.

[0067] In a specific embodiment of the present application, the total length of the battery module 1000 in the first direction X is 471.3 cm, the thickness D value of the liquid cooling plate 31 in the first direction X is 12 cm, the height of the battery cell 11 in the second direction Z is 204 cm, the height of the battery module 1000 in the second direction Z is 212.2 cm, the vertical distance from the liquid inlet pipeline 32 to the second installation side 1B in the second direction Z is 67 cm, the H1 value, the H2 value, and the H3 value are all between 155 cm and 160 cm, specifically 160 cm, the liquid inlet pipeline 32 and the liquid outlet pipeline 33 are circular pipelines, and the pipeline diameters of the liquid inlet pipeline 32 and the liquid outlet pipeline 33 are both between 4.5 cm and 5.5 cm, specifically 5 cm.

[0068] The utility model further proposes a battery pack, which includes a battery module 1000. The battery module 1000 is as described above. Since the battery pack adopts all the technical solutions of all the above embodiments, it at least has the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0069] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for technicians in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery module, characterized in that: include: A battery cell assembly, comprising a plurality of battery cells, wherein the plurality of battery cells are arranged along a first direction, and two adjacent battery cells are spaced apart from each other; An end plate assembly, comprising a first end plate, the first end plate being located on one side of the plurality of battery cells in the first direction, a first liquid cooling cavity being arranged in the first end plate, a liquid inlet and a liquid discharge port being arranged on the first end plate, the liquid inlet and the liquid discharge port both being connected to the first liquid cooling cavity; as well as, A liquid cooling assembly, comprising at least one liquid cooling plate, wherein the liquid cooling plate is arranged between any two adjacent battery cells, and a second liquid cooling cavity is arranged in the liquid cooling plate; Wherein, the first liquid cooling chamber is communicated with the second liquid cooling chamber.

2. The battery module according to claim 1, characterized in that: The end plate assembly further includes a second end plate, wherein the first end plate and the second end plate are respectively located on both sides of the plurality of battery cells in the first direction; A third liquid cooling cavity is disposed in the second end plate, and the third liquid cooling cavity is communicated with the first liquid cooling cavity.

3. The battery module according to claim 2, characterized in that: The first liquid cooling chamber comprises a first sub-liquid cooling chamber and a second sub-liquid cooling chamber, the first sub-liquid cooling chamber and the second sub-liquid cooling chamber are spaced from each other, the first sub-liquid cooling chamber is communicated with the liquid inlet, and the second sub-liquid cooling chamber is communicated with the liquid outlet; The first end plate is further provided with a first communication port and a second communication port, the first communication port is communicated with the first sub-liquid cooling cavity, and the second sub-liquid cooling cavity is communicated with the second communication port; The liquid cooling plate is provided with a first liquid inlet and a first liquid outlet, and the first liquid inlet and the first liquid outlet are both connected to the second liquid cooling cavity; A second liquid inlet and a second liquid outlet are provided on the second end plate, and the second liquid inlet and the second liquid outlet are both connected to the third liquid cooling chamber; Wherein, the first communication port is communicated with the first liquid inlet and the second liquid inlet, and the second communication port is communicated with the first liquid outlet and the second liquid outlet.

4. The battery module according to claim 3, characterized in that: The liquid cooling assembly also includes a liquid inlet pipeline and a liquid outlet pipeline; Wherein, the first communication port is communicated with the first liquid inlet and the second liquid inlet through the liquid inlet pipeline; the second communication port is communicated with the first liquid outlet and the second liquid outlet through the liquid outlet pipeline.

5. The battery module according to claim 4, characterized in that: The battery module comprises a first mounting side and a second mounting side opposite to the first mounting side in a second direction, wherein the first direction and the second direction intersect each other; In the second direction, the vertical distance from the first liquid inlet to the plane where the second mounting side is located is smaller than the vertical distance from the first liquid outlet to the plane where the second mounting side is located; the vertical distance from the second liquid inlet to the plane where the second mounting side is located is smaller than the vertical distance from the second liquid outlet to the plane where the second mounting side is located.

6. The battery module according to claim 2, characterized in that: The maximum size of the first liquid cooling cavity in the second direction is defined as H1, the maximum size of the second liquid cooling cavity in the second direction is defined as H2, the maximum size of the third liquid cooling cavity in the second direction is defined as H3, the size of the battery cell in the second direction is defined as H4, and the first direction and the second direction intersect each other; wherein H1, H2, H3 and H4 satisfy: 0.75H4≤H1≤0.80H4; 0.75H4≤H2≤0.80H4; and, 0.75H4≤H3≤0.80H4.

7. The battery module according to any one of claims 1 to 6, characterized in that: The plurality of battery cells are arranged in sequence along the first direction.

8. The battery module according to claim 7, characterized in that: The thickness of the liquid cooling plate in the first direction is defined as D; wherein D satisfies: 12 cm ≤ D ≤ 13 cm.

9. The battery module according to any one of claims 1 to 6, characterized in that: The battery module also includes thermally conductive adhesive; Wherein, the thermal conductive adhesive is arranged between the battery core and the liquid cooling plate, and between the battery core and the first end plate.

10. A battery pack, characterized in that: Comprising the battery module according to any one of claims 1 to 9.

Images