Battery pack

Abstract

The invention discloses a battery pack, and belongs to the technical field of batteries, the battery pack comprises a battery module and a liquid cooling assembly, the battery module comprises a plurality of battery packs, the plurality of battery packs are distributed in at least two layers along the Z direction, the battery packs extend along the X direction, the liquid cooling assembly comprises a first liquid cooling plate, a second liquid cooling plate and an edge liquid cooling plate, the first liquid cooling plate is arranged on one side, in the Z direction, of the battery module, the second liquid cooling plate is arranged on the other side, in the Z direction, of the battery module, the two sets of edge liquid cooling plates are arranged and distributed on the two opposite sides, in the Y direction, of the battery module, and each edge liquid cooling plate comprises a first cooling plate and a second cooling plate which are perpendicularly connected; the first cold plate is arranged at the side part of the battery module along the Y direction, and the second cold plate is arranged between two adjacent layers of battery packs along the Z direction. Through cooperation of the first liquid cooling plate, the second liquid cooling plate and the edge liquid cooling plate, the contact area of the liquid cooling assembly and the battery module is increased, the liquid cooling effect is improved, and the problem that the temperature of the battery module is not uniform is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery pack. BACKGROUND

[0002] The existing energy storage battery pack usually adopts air cooling or liquid cooling. Most of the existing battery packs are single-layer battery module structures, and the liquid cooling is usually provided by a bottom water cooling plate at the bottom of the battery module, and the heat generated by the battery module is removed by the flow of liquid in the bottom water cooling plate.

[0003] Due to space limitations and power requirements, some battery packs use double-layer battery modules or multi-layer battery modules. For a battery pack with double-layer battery modules, a middle water cooling plate is usually arranged between the two layers of battery modules. The single middle water cooling plate has a large area, resulting in poor structural strength and easy deformation of the middle water cooling plate. In addition, the uneven arrangement of the water cooling plate leads to a large temperature difference between the upper and lower surfaces or the left and right sides of the battery module, and the temperature of different parts is different, resulting in poor temperature consistency of the battery module, thereby affecting the service life of the battery pack. SUMMARY

[0004] The present application provides a battery pack to solve the technical problems of uneven heat dissipation, poor cooling effect, low strength of single water cooling plate and low space utilization in the prior art.

[0005] As conceived above, the technical solution adopted by the present application is:

[0006] A battery pack, comprising a battery module and a liquid cooling assembly, the battery module comprising a plurality of battery groups, the plurality of battery groups being distributed in at least two layers along a Z direction, the battery groups extending along an X direction, the liquid cooling assembly comprising:

[0007] a first liquid cooling plate arranged on one side of the battery module along the Z direction;

[0008] a second liquid cooling plate arranged on the other side of the battery module along the Z direction;

[0009] a side liquid cooling plate arranged on two sides and distributed on opposite sides of the battery module along a Y direction, the side liquid cooling plate comprising a first cooling plate and a second cooling plate connected vertically, the first cooling plate being arranged on the side of the battery module along the Y direction, the second cooling plate being arranged between two adjacent layers of the battery groups along the Z direction, the Z direction being the height direction of the battery module, the X direction being the length direction of the battery module, and the Y direction being the width direction of the battery module.

[0010] Preferably, the first cooling plate is internally provided with a first flow channel, the second cooling plate is internally provided with a second flow channel, and the first flow channel and the second flow channel are not connected.

[0011] As preferred, the first cold plate comprises at least two first flow channels arranged in communication, the inlet and outlet of the first flow channels are located on the same side of the first cold plate and are arranged in interval along the Z direction, the inlet of the first flow channel is located higher than the outlet of the first flow channel, and the fluid flows in the first flow channel in a zigzag manner from top to bottom;

[0012] As preferred, the inlet and outlet of the second flow channel are distributed on both sides of the second cold plate along the X direction, and the fluid flows in the second flow channel in a straight line.

[0013] As preferred, the first liquid cooling plate is internally provided with a first liquid cooling flow channel, and the second liquid cooling plate is internally provided with a second liquid cooling flow channel, and the first liquid cooling flow channel is not in communication with the second liquid cooling flow channel.

[0014] As preferred, each layer is provided with at least two battery groups arranged along the Y direction, and the liquid cooling assembly further comprises:

[0015] a middle liquid cooling plate, the middle liquid cooling plate comprises a third cold plate and a fourth cold plate connected vertically, the third cold plate is arranged between two adjacent battery groups arranged along the Y direction and is parallel to the first cold plate, and the fourth cold plate is arranged between two adjacent battery groups arranged along the Z direction and is parallel to the second cold plate.

[0016] As preferred, the third cold plate is internally provided with a third flow channel, and the fourth cold plate is internally provided with a fourth flow channel, and the third flow channel is not in communication with the fourth flow channel.

[0017] As preferred, the third cold plate comprises at least two third flow channels arranged in communication, the third flow channels are distributed on both sides of the fourth cold plate along the Z direction; the inlet and outlet of the third flow channels are located on the same side of the third cold plate and are arranged on both sides of the fourth cold plate along the Z direction, the inlet of the third flow channel is located higher than the outlet of the third flow channel, and the fluid flows in the third flow channel in a zigzag manner from top to bottom;

[0018] The fourth cold plate comprises at least two fourth flow channels arranged in communication, the fourth flow channels are distributed on both sides of the third cold plate along the Y direction; the inlet and outlet of the fourth flow channels are located on the same side of the fourth cold plate and are arranged on both sides of the third cold plate along the Y direction, and the fluid flows in the fourth flow channel in a zigzag manner from one side of the third cold plate to the other side.

[0019] As preferred, the first cold plate is internally provided with a first flow channel, and the third flow channel is in communication with the first flow channel.

[0020] The second cold plate is internally provided with a second flow channel, and the fourth flow channel communicates with the second flow channel.

[0021] As preferred, the liquid cooling assembly further comprises a first liquid inlet pipe and a first liquid return pipe, the inlet of the third flow channel and the inlet of the first flow channel both communicate with the first liquid inlet pipe, and the outlet of the third flow channel and the outlet of the first flow channel both communicate with the first liquid return pipe, and the first liquid inlet pipe and the first liquid return pipe are arranged on one side of the battery module along the X direction.

[0022] The liquid cooling assembly further comprises an adapter pipe, the fourth flow channel and the second flow channel communicate through the adapter pipe, and the adapter pipe is arranged on the other side of the battery module along the X direction.

[0023] As preferred, the liquid cooling assembly further comprises a liquid inlet pipeline and a liquid return pipeline, the liquid inlet pipeline and the liquid return pipeline are arranged on the same side of the battery module along the X direction, the liquid inlet pipeline has at least two liquid supply openings, and the liquid return pipeline has at least two liquid return openings.

[0024] The present application has the following beneficial effects:

[0025] The battery pack provided by the present application comprises a battery module and a liquid cooling assembly, the battery module comprises a plurality of battery groups, the plurality of battery groups are distributed in at least two layers along the Z direction, a first liquid cooling plate is arranged on one side of the battery module along the Z direction, a second liquid cooling plate is arranged on the other side of the battery module along the Z direction, two edge liquid cooling plates are arranged on opposite sides of the battery module along the Y direction, the edge liquid cooling plate comprises a first cold plate and a second cold plate connected perpendicularly, the first cold plate is arranged on the side of the battery module along the Y direction, and the second cold plate is arranged between two adjacent layers of battery groups along the Z direction. The top first liquid cooling plate, the bottom second liquid cooling plate and the two side edge liquid cooling plates cooperate to enable the multiple surfaces of the battery group to be liquid-cooled, improve temperature uniformity, increase the contact area of the liquid cooling assembly and the battery module, improve the liquid cooling effect, and improve the problem of uneven heat dissipation of the battery module as a whole and poor cooling effect. In addition, compared with a single water cooling plate, the two side edge T-shaped liquid cooling plates and the cross-shaped middle liquid cooling plate can improve the overall structural strength, avoid arranging a single water cooling plate with a large area between the two adjacent layers of battery groups, increase the local rigidity due to the connection of the first cold plate and the second cold plate, avoid displacement of the first cold plate relative to the battery group, and ensure the liquid cooling effect. The stacking design of the battery group by the second cold plate and the middle liquid cooling plate can effectively improve the space utilization and realize stepless expansion of the length of the battery cell, and adapt to different application scenarios of the battery pack. Compared with a single water cooling plate, the multi-segment splicing design of the two side edge T-shaped liquid cooling plates and the cross-shaped middle liquid cooling plate can be modularized, reduce the number of molds and tooling costs, save costs, and enable quick splicing for convenient installation and improved efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 This is a schematic diagram of the battery pack structure provided in an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional view of the battery pack provided in an embodiment of the present invention;

[0028] Figure 3 This is a first schematic diagram of a portion of the battery pack structure provided in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the flow path of coolant entering the first liquid cooling plate according to an embodiment of the present invention;

[0030] Figure 5 yes Figure 4 Cross-sectional view of the first liquid cooling plate in the middle;

[0031] Figure 6 This is a schematic diagram of the flow path of coolant entering the second liquid cooling plate according to an embodiment of the present invention;

[0032] Figure 7 yes Figure 6 Cross-sectional view of the second liquid cooling plate in the middle;

[0033] Figure 8 This is a schematic diagram of the edge liquid cooling plate provided in an embodiment of the present invention;

[0034] Figure 9 yes Figure 8 First cross-sectional view of the middle edge liquid cooling plate;

[0035] Figure 10 yes Figure 8 Second sectional view of the middle edge liquid cooling plate;

[0036] Figure 11 This is a schematic diagram of the structure of the central liquid cooling plate provided in an embodiment of the present invention;

[0037] Figure 12 yes Figure 11 First cross-sectional view of the central liquid cooling plate;

[0038] Figure 13 yes Figure 11 Second cross-sectional view along the central liquid cooling plate;

[0039] Figure 14 This is a second schematic diagram of a portion of the battery pack structure provided in an embodiment of the present invention;

[0040] Figure 15 This is a schematic diagram of the first flow channel and the third flow channel provided in an embodiment of the present invention;

[0041] Figure 16is a schematic view of the second flow channel and the fourth flow channel provided by the embodiment of the present application;

[0042] Figure 17 is Figure 16 is a sectional view of the second flow channel and the fourth flow channel.

[0043] in the figure:

[0044] 10, battery module; 11, battery pack; 111, battery cell;

[0045] 20, liquid cooling assembly;

[0046] 21, first liquid cooling plate; 211, first liquid cooling flow channel; 212, first inlet; 213, first outlet;

[0047] 22, second liquid cooling plate; 221, second liquid cooling flow channel; 222, second inlet; 223, second outlet;

[0048] 23, edge liquid cooling plate; 231, first cooling plate; 2311, first flow channel; 2312, third inlet; 2313, third outlet; 232, second cooling plate; 2321, second flow channel; 2322, fourth inlet; 2323, fourth outlet;

[0049] 24, middle liquid cooling plate; 241, third cooling plate; 2411, third flow channel; 2412, fifth inlet; 2413, fifth outlet; 242, fourth cooling plate; 2421, fourth flow channel; 2422, sixth inlet; 2423, sixth outlet;

[0050] 251, first liquid inlet pipe; 252, first liquid return pipe; 26, adapter pipe; 271, liquid inlet pipeline; 2711, liquid supply port; 272, liquid return pipeline; 2721, liquid return port; 28, communication pipe;

[0051] 30, battery box; 31, end plate; 32, side plate;

[0052] 40, compressed foam. DETAILED DESCRIPTION

[0053] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0054] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.

[0056] The technical solutions of the present application will be further illustrated by specific embodiments in conjunction with the accompanying drawings.

[0057] Referring to Figures 1 to 3 , the embodiment provides a battery pack, which comprises a battery module 10 and a liquid cooling assembly 20. The battery module 10 comprises a plurality of battery groups 11, and the plurality of battery groups 11 are distributed in at least two layers along a Z direction. The battery groups 11 extend along an X direction. The liquid cooling assembly 20 comprises a first liquid cooling plate 21, a second liquid cooling plate 22 and an edge liquid cooling plate 23. The first liquid cooling plate 21 is arranged on one side of the battery module 10 along the Z direction. The second liquid cooling plate 22 is arranged on the other side of the battery module 10 along the Z direction. The edge liquid cooling plate 23 is arranged in two groups and is distributed on opposite sides of the battery module 10 along a Y direction. The edge liquid cooling plate 23 comprises a first cooling plate 231 and a second cooling plate 232 connected perpendicularly. The first cooling plate 231 is arranged on the side of the battery module 10 along the Y direction. The second cooling plate 232 is arranged between two adjacent battery groups 11 along the Z direction. The Z direction is the height direction of the battery module 10. The X direction is the length direction of the battery module 10. The Y direction is the width direction of the battery module 10.

[0058] The cooperation of the first liquid cooling plate 21, the second liquid cooling plate 22 and the edge liquid cooling plate 23 enables the multi-faces of the battery pack 11 to be liquid-cooled, improves temperature uniformity, increases the contact area of the liquid cooling assembly 20 and the battery module 10, improves the liquid cooling effect, and improves the overall uneven heat dissipation and poor cooling effect of the battery module 10; such a multi-face cooling system (top first liquid cooling plate 21 + bottom second liquid cooling plate 22 + two sides T-shaped edge liquid cooling plate 23) can greatly improve the heat exchange area, reduce the average temperature of the battery cell, increase the charging rate, and shorten the fast charging time. The multi-face cooling system limits the battery pack from top to bottom and left to right, which can improve the extrusion strength of the battery module as a whole and reduce the displacement of the battery cell when the side is collided.

[0059] In addition, the second cooling plate 232 avoids setting a single large-area water cooling plate between the adjacent two layers of battery packs 11. Since the first cooling plate 231 is connected with the second cooling plate 232, the structural strength is increased, the first cooling plate 231 is prevented from being displaced relative to the battery pack 11, and the liquid cooling effect is ensured.

[0060] The battery pack 11 includes a plurality of battery cells 111, and the plurality of battery cells 111 are arranged in a stack along the X direction. The positive and negative pole posts are arranged on one side of the battery pack 11 along the X direction, and the explosion-proof valve is arranged on the other side of the battery pack 11 along the X direction. The length of the battery pack 11 along the X direction can be set according to actual needs, and the length of the battery pack 11 can be adjusted by changing the number of battery cells 111.

[0061] In the embodiment, the plurality of battery packs 11 are distributed in two layers along the Z direction, and the second cooling plate 232 is located between the two layers of battery packs 11. The edge liquid cooling plate 23 includes the first cooling plate 231 and the second cooling plate 232 connected perpendicularly, and thus the edge liquid cooling plate 23 is T-shaped. The design of the second cooling plate 232 optimizes the heat exchange distance between the cooling liquid and the battery pack 11, and can effectively reduce the maximum temperature difference between the layers and improve the temperature uniformity compared with a single large cooling plate.

[0062] In other embodiments, the plurality of battery packs 11 are distributed in three layers along the Z direction, and the second cooling plate 232 is arranged between the adjacent two layers of battery packs 11, i.e., two second cooling plates 232 are arranged in parallel and spaced apart on each first cooling plate 231. In other embodiments, the plurality of battery packs 11 are distributed in four layers or more than four layers along the Z direction, which will not be described here. The multi-section splicing of the second cooling plate 232 on the first cooling plate 231 does not need to redesign the cooling plate, realizes the stacking design of the battery pack 11, can effectively improve the space utilization, realizes the stepless expansion of the length of the battery cell, and adapts to different application scenarios of the battery pack.

[0063] Since the edge liquid cooling plate 23 is provided with two groups and is distributed on the opposite sides of the battery module 10 along the Y direction, the first cooling plate 231 is arranged on the side of the battery module 10 along the Y direction, so that the first cooling plate 231 is arranged on the opposite sides of the battery module 10 along the Y direction, and the second cooling plate 232 connected to the two first cooling plates 231 is located between the two layers of battery groups 11, that is, two second cooling plates 232 are arranged between the two layers of battery groups 11, so that the arrangement of the second cooling plate 232 avoids arranging a single large-area water cooling plate between the adjacent two layers of battery groups 11, and improves the problem of uneven temperature of the battery module 10.

[0064] The height of the first cooling plate 231 along the Z direction is not less than the height of the battery module 10 along the Z direction, so as to increase the contact area of the first cooling plate 231 and the battery module 10, form a "anti-touching top" limiting, and avoid short circuit of the pole and the top cover of the box under vibration condition. A heat-conducting member, such as a heat-conducting pad, can be arranged between the first cooling plate 231 and the battery module 10 to improve the heat dissipation effect and better compress the battery module 10 to improve the overall strength.

[0065] The battery pack further comprises a battery box 30, and the battery box 30 comprises end plates 31 and side plates 32. The two end plates 31 are distributed on the opposite sides of the battery module 10 along the X direction, and the two side plates 32 are distributed on the opposite sides of the battery module 10 along the Y direction. Compression foam 40 can be arranged between the side plate 32 and the edge liquid cooling plate 23 to facilitate compression of the edge liquid cooling plate 23 during installation, thereby reducing installation tolerance and reducing assembly time.

[0066] In the embodiment, the first liquid cooling plate 21 is arranged on the top of the battery module 10, and the second liquid cooling plate 22 is arranged on the bottom of the battery module 10, so that the upper and lower parts of the battery module 10 can be liquid-cooled. For example, a heat-conducting member, such as a heat-conducting pad, is arranged between the first liquid cooling plate 21 and the battery module 10 to improve the heat dissipation effect and better compress the battery module 10 to improve the overall strength. A heat-conducting member, such as a heat-conducting pad, is arranged between the second liquid cooling plate 22 and the battery module 10 to improve the heat dissipation effect and better compress the battery module 10 to improve the overall strength.

[0067] Referring to Figures 4 to 7 The first liquid cooling flow channel 211 is arranged in the first liquid cooling plate 21, and the second liquid cooling flow channel 221 is arranged in the second liquid cooling plate 22, and the first liquid cooling flow channel 211 and the second liquid cooling flow channel 221 are not communicated. The cooling liquid flow path is optimized to improve the heat exchange efficiency and heat exchange uniformity, and improve the problem of uneven temperature of the battery module 10.

[0068] The flow paths of the first liquid cooling flow channel 211 and the second liquid cooling flow channel 221 can be set as required. In the embodiment, the inlet and outlet of the first liquid cooling flow channel 211 are located on the same side of the first liquid cooling plate 21, facilitating the arrangement of the liquid cooling pipeline. As shown in Figure 5 , the inlet of the first liquid cooling flow channel 211 is denoted by a first inlet 212, and the outlet of the first liquid cooling flow channel 211 is denoted by a first outlet 213. The inlet and outlet of the second liquid cooling flow channel 221 are located on the same side of the second liquid cooling plate 22, facilitating the arrangement of the liquid cooling pipeline. As shown in Figure 7 , the inlet of the second liquid cooling flow channel 221 is denoted by a second inlet 222, and the outlet of the second liquid cooling flow channel 221 is denoted by a second outlet 223. Figures 4 to 7 The arrows in the figure show the direction of the flow of the cooling liquid.

[0069] Specifically, the first liquid cooling flow channel 211 includes a plurality of first flow paths arranged in parallel and at intervals, and in adjacent two first flow paths, the liquid outlet end of one first flow path is in communication with the liquid inlet end of the other first flow path, that is, the plurality of first flow paths are connected in series, and the fluid flows tortuously along the first liquid cooling flow channel 211, increasing the contact area of the cooling liquid with the first liquid cooling plate 21 and improving the heat dissipation effect. The second liquid cooling flow channel 221 includes a plurality of second flow paths arranged in parallel and at intervals, and in adjacent two second flow paths, the liquid outlet end of one second flow path is in communication with the liquid inlet end of the other second flow path, that is, the plurality of second flow paths are connected in series, and the fluid flows tortuously along the second liquid cooling flow channel 221, increasing the contact area of the cooling liquid with the second liquid cooling plate 22 and improving the heat dissipation effect.

[0070] The liquid cooling assembly 20 further includes an inlet pipeline 271 and a return pipeline 272, the inlet pipeline 271 and the return pipeline 272 are arranged on the same side of the battery module 10 along the X direction, the inlet pipeline 271 has at least two liquid supply ports 2711, and the return pipeline 272 has at least two liquid return ports 2721. The inlet of the first liquid cooling flow channel 211 and the inlet of the second liquid cooling flow channel 221 are in communication with different liquid supply ports 2711, and the outlet of the first liquid cooling flow channel 211 and the outlet of the second liquid cooling flow channel 221 are in communication with different liquid return ports 2721, so that the first liquid cooling flow channel 211 and the second liquid cooling flow channel 221 are not in communication.

[0071] Referring to Figures 8 to 10 , the first flow channel 2311 is arranged in the first cold plate 231, and the second flow channel 2321 is arranged in the second cold plate 232, and the first flow channel 2311 and the second flow channel 2321 are not in communication. The cooling liquid flow path is optimized, the heat exchange efficiency and the heat exchange uniformity are improved, and the problem of uneven temperature of the battery module 10 is improved.

[0072] The flow paths of the first flow channels 2311 and the second flow channels 2321 can be set according to actual needs. In the embodiment, the first cold plate 231 includes at least two first flow channels 2311 which are communicated, the inlet and outlet of the first flow channels 2311 are located on the same side of the first cold plate 231, and are spaced apart along the Z direction, facilitating the arrangement of the liquid cooling pipe. The inlet of the first flow channels 2311 is located higher than the outlet of the first flow channels 2311, and the fluid flows in the first flow channels 2311 in a zigzag manner from top to bottom, increasing the contact area of the fluid with the first cold plate 231 and improving the heat dissipation effect.

[0073] The inlet and outlet of the second flow channels 2321 are distributed on both sides of the second cold plate 232 along the X direction, and the fluid flows in the second flow channels 2321 in a straight line, which is simple in structure and smooth in fluid flow, improving the heat dissipation efficiency.

[0074] As shown in Figure 9 , the third inlet 2312 represents the inlet of the first flow channels 2311, and the third outlet 2313 represents the outlet of the first flow channels 2311. As shown in Figure 10 , the fourth inlet 2322 represents the inlet of the second flow channels 2321, and the fourth outlet 2323 represents the outlet of the second flow channels 2321.

[0075] Referring to Figures 11 to 17 , in combination with Figures 1 to 3 , at least two battery packs 11 are arranged on each layer and arranged along the Y direction, and the liquid cooling assembly 20 further includes a middle liquid cooling plate 24, the middle liquid cooling plate 24 includes a third cold plate 241 and a fourth cold plate 242 which are connected vertically, the third cold plate 241 is arranged between the two adjacent rows of battery packs 11 arranged along the Y direction and parallel to the first cold plate 231, and the fourth cold plate 242 is arranged between the two adjacent layers of battery packs 11 arranged along the Z direction and parallel to the second cold plate 232.

[0076] By arranging the middle liquid cooling plate 24, in cooperation with the first liquid cooling plate 21, the second liquid cooling plate 22 and the edge liquid cooling plate 23, the multiple surfaces of each battery pack 11 can be cooled by liquid, increasing the contact area of the liquid cooling assembly 20 and the battery module 10, improving the liquid cooling effect, and improving the problem of uneven temperature of the battery module 10. In addition, the arrangement of the fourth cold plate 242 avoids arranging a single large-area water cooling plate between the two adjacent layers of battery packs 11, increases the structural strength, and ensures the liquid cooling effect.

[0077] The height of the third cold plate 241 along the Z direction is not less than the height of the battery module 10 along the Z direction, so as to increase the contact area of the third cold plate 241 and the battery module 10. A heat-conducting member such as a heat-conducting pad can be arranged between the third cold plate 241 and the battery module 10 to improve the heat dissipation effect, and better compress the battery module 10 to improve the overall strength.

[0078] In the embodiment, the plurality of battery groups 11 are distributed in two layers along the Z direction, each layer is provided with two battery groups 11 and arranged along the Y direction, that is, the battery module 10 includes four battery groups 11, and the corresponding middle liquid cooling plate 24 is in a cross shape, the third cooling plate 241 extends along the XZ plane and contacts the two layers of battery groups 11 arranged along the Z direction, and the fourth cooling plate 242 extends along the XY plane and contacts the two adjacent rows of battery groups 11 arranged along the Y direction. Compared with a single water cooling plate, the multi-section splicing design of the two side edge liquid cooling plates 23 and the cross-shaped middle liquid cooling plate 24 can be modularized, that is, different cutting lengths of a universal profile, which can reduce the number of molds and tooling costs, save costs, and quick splicing makes installation convenient and improves efficiency.

[0079] In other embodiments, the plurality of battery groups 11 are distributed in three layers along the Z direction, each layer is provided with two battery groups 11 and arranged along the Y direction, that is, the battery module 10 includes six battery groups 11, and the corresponding middle liquid cooling plate 24 includes two layers of fourth cooling plates 242, that is, the two layers of fourth cooling plates 242 are parallel and spaced apart on the third cooling plate 241, and the fourth cooling plate 242 extends along the XY plane and contacts the two adjacent rows of battery groups 11 arranged along the Y direction. Compared with a single water cooling plate, the design of the two side edge liquid cooling plates 23 and the cross-shaped middle liquid cooling plate 24 can not only further improve the overall structural strength, improve the module extrusion strength and anti-vibration acceleration, but also effectively block the heat diffusion path, greatly reduce the horizontal heat spread speed when a single cell abnormally heats, and gain more active power-off time for the BMS.

[0080] The third cooling plate 241 is provided with a third flow channel 2411 in the inside, and the fourth cooling plate 242 is provided with a fourth flow channel 2421 in the inside, and the third flow channel 2411 and the fourth flow channel 2421 are not communicated. The cooling liquid flow path is optimized, the heat exchange efficiency and uniformity are improved, and the problem of uneven temperature of the battery module 10 is improved.

[0081] The flow path of the third flow channel 2411 and the flow path of the fourth flow channel 2421 can be set according to actual needs. In the embodiment, the third cooling plate 241 includes at least two third flow channels 2411 which are communicated, and the third flow channels 2411 are distributed on both sides of the fourth cooling plate 242 along the Z direction; the inlet and outlet of the third flow channel 2411 are located on the same side of the third cooling plate 241, and are arranged on both sides of the fourth cooling plate 242 along the Z direction, the inlet position of the third flow channel 2411 is higher than the outlet position of the third flow channel 2411, and the fluid flows tortuously from top to bottom along the third flow channel 2411. Increase the contact area of the fluid and the third cooling plate 241, and improve the heat dissipation effect.

[0082] The fourth cold plate 242 includes at least two fourth flow channels 2421 in communication, and the fourth flow channels 2421 are distributed on both sides of the third cold plate 241 along the Y direction; the inlet and the outlet of the fourth flow channel 2421 are located on the same side of the fourth cold plate 242, and are arranged on both sides of the third cold plate 241 along the Y direction, and the fluid flows in the fourth flow channel 2421 from one side to the other side of the third cold plate 241. The contact area of the fluid with the fourth cold plate 242 is increased, and the heat dissipation effect is improved.

[0083] The two adjacent fourth flow channels 2421 are in communication through the communication pipe 28. Since the fourth flow channels 2421 are distributed on both sides of the third cold plate 241 along the Y direction, the communication pipe 28 is arranged to facilitate the communication of the fourth flow channels 2421 on both sides of the third cold plate 241 along the Y direction. Specifically, the inlet and the outlet of the fourth flow channel 2421 are located on one side of the fourth cold plate 242, and the communication pipe 28 is arranged on the other side of the fourth cold plate 242.

[0084] As shown in FIG. 5, the fifth inlet 2412 represents the inlet of the third flow channel 2411, and the fifth outlet 2413 represents the outlet of the third flow channel 2411. As shown in FIG. 6, the sixth inlet 2422 represents the inlet of the fourth flow channel 2421, and the sixth outlet 2423 represents the outlet of the fourth flow channel 2421. Figure 12 Figure 13

[0085] Since the first cold plate 231 is parallel to the third cold plate 241, the first cold plate 231 is internally provided with the first flow channel 2311, and the third cold plate 241 is internally provided with the third flow channel 2411. In this embodiment, the third flow channel 2411 is in communication with the first flow channel 2311, which simplifies the structure of the liquid cooling pipeline.

[0086] Since the second cold plate 232 is parallel to the fourth cold plate 242, the second cold plate 232 is internally provided with the second flow channel 2321, and the fourth cold plate 242 is internally provided with the fourth flow channel 2421. In this embodiment, the fourth flow channel 2421 is in communication with the second flow channel 2321, which simplifies the structure of the liquid cooling pipeline.

[0087] Exemplarily, the liquid cooling assembly 20 further includes a first liquid inlet pipe 251 and a first liquid return pipe 252. The inlet of the third flow channel 2411 and the inlet of the first flow channel 2311 are in communication with the first liquid inlet pipe 251, and the outlet of the third flow channel 2411 and the outlet of the first flow channel 2311 are in communication with the first liquid return pipe 252. The first liquid inlet pipe 251 and the first liquid return pipe 252 are arranged on one side of the battery module 10 along the X direction. By arranging the first liquid inlet pipe 251 and the first liquid return pipe 252, the third flow channel 2411 and the first flow channel 2311 are connected in parallel, that is, the cooling liquid in the first liquid inlet pipe 251 can flow into the first flow channel 2311 and the third flow channel 2411 at the same time, thereby improving the heat exchange efficiency. ​​

[0088] Figure 15 The arrows shown in FIG. 24 indicate the fluid flow path. The cooling liquid in the liquid inlet pipe 271 flows into the first liquid inlet pipe 251. Since the inlet of the third flow channel 2411 and the inlet of the first flow channel 2311 are both communicated with the first liquid inlet pipe 251, the cooling liquid simultaneously enters the third flow channel 2411 and the first flow channel 2311, and flows along the third flow channel 2411 and the first flow channel 2311 to the first liquid return pipe 252, which is communicated with the liquid return pipe 272.

[0089] Exemplarily, the liquid cooling assembly 20 further comprises a bypass pipe 26, the fourth flow channel 2421 and the second flow channel 2321 are communicated through the bypass pipe 26, and the bypass pipe 26 is arranged at the other side of the battery module 10 along the X direction. By arranging the bypass pipe 26, the fourth flow channel 2421 and the second flow channel 2321 are connected in series, that is, the cooling liquid flows through one second flow channel 2321 and the fourth flow channel 2421 in turn and flows through another second flow channel 2321, and the cooling liquid can be fully utilized. By arranging the first liquid inlet pipe 251 and the first liquid return pipe 252 at one side of the battery module 10 along the X direction and arranging the bypass pipe 26 at the other side of the battery module 10 along the X direction, the space is fully utilized, and the compactness of the structure is ensured.

[0090] Figure 16 And Figure 17 The arrows shown in FIG. 24 indicate the fluid flow path. The cooling liquid in the liquid inlet pipe 271 flows into the first liquid inlet pipe 251. Since the inlet of the third flow channel 2411 and the inlet of the first flow channel 2311 are both communicated with the first liquid inlet pipe 251, the cooling liquid simultaneously enters the third flow channel 2411 and the first flow channel 2311, and flows along the third flow channel 2411 and the first flow channel 2311 to the first liquid return pipe 252, which is communicated with the liquid return pipe 272.

[0091] In this embodiment, the cooling liquid is distributed to each flow channel by each liquid supply port 2711 of the liquid inlet pipe 271, realizing multi-surface cooling of the battery module 10, greatly enhancing the overall heat dissipation effect, and finally being collected into the liquid return pipe 272 by each liquid return port 2721 of the liquid return pipe 272, completing the circulation. Each branch flow channel is independently controllable, and can realize partition control according to actual needs.

[0092] Specifically, the liquid inlet pipeline 271 has four liquid supply ports 2711, the first liquid supply port 2711 is communicated with the inlet of the first liquid cooling channel 211, the second liquid supply port 2711 is communicated with the inlet of the second liquid cooling channel 221, the third liquid supply port 2711 is communicated with the first liquid inlet pipe 251, and the fourth liquid supply port 2711 is communicated with the inlet of one of the second channels 2321. The liquid return pipeline 272 has four liquid return ports 2721, the first liquid return port 2721 is communicated with the outlet of the first liquid cooling channel 211, the second liquid return port 2721 is communicated with the outlet of the second liquid cooling channel 221, the third liquid return port 2721 is communicated with the first liquid return pipe 252, and the fourth liquid return port 2721 is communicated with the outlet of the other second channel 2321. The cooling liquid is provided through four independent branches, and the first channel 2311 and the third channel 2411 use parallel water pipes, the second channel 2321 and the fourth channel 2421 use series water pipes, which greatly reduces the cooling liquid temperature difference problem, greatly improves the cooling efficiency, and reduces the uneven cooling problem.

[0093] Since the cooling liquid is branched from the liquid inlet pipeline 271 to each liquid supply port 2711 and flows from the liquid supply port 2711 to each channel, the communication position of the liquid supply port 2711 and the channel and the communication position of the pipeline and the channel can be provided with a water pipe joint or a converging plug according to needs, which is not described here.

[0094] The first liquid cooling plate 21, the second liquid cooling plate 22, the edge liquid cooling plate 23 and the middle liquid cooling plate 24 in the embodiment are all insulated, for example, an insulating layer or an insulating plate is provided to avoid short circuit problem in the battery pack.

[0095] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited by the above embodiments. Various changes and modifications can be made without departing from the spirit and scope of the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A battery pack, characterized in that, The device includes a battery module (10) and a liquid cooling assembly (20). The battery module (10) includes multiple battery packs (11), which are distributed in at least two layers along the Z direction and extend along the X direction. The liquid cooling assembly (20) includes: A first liquid cooling plate (21) is disposed on one side of the battery module (10) along the Z direction; The second liquid cooling plate (22) is disposed on the other side of the battery module (10) along the Z direction; Two sets of edge liquid cooling plates (23) are provided and distributed on opposite sides of the battery module (10) along the Y direction. The edge liquid cooling plates (23) include a first cold plate (231) and a second cold plate (232) connected vertically. The first cold plate (231) is provided on the side of the battery module (10) along the Y direction, and the second cold plate (232) is provided between two adjacent layers of the battery pack (11) along the Z direction. The Z direction is the height direction of the battery module (10), the X direction is the length direction of the battery module (10), and the Y direction is the width direction of the battery module (10).

2. The battery pack according to claim 1, characterized in that, The first cold plate (231) has a first flow channel (2311) inside, and the second cold plate (232) has a second flow channel (2321) inside. The first flow channel (2311) and the second flow channel (2321) are not connected.

3. The battery pack according to claim 2, characterized in that, The first cold plate (231) includes at least two interconnected first flow channels (2311). The inlet and outlet of the first flow channels (2311) are located on the same side of the first cold plate (231) and are spaced apart along the Z direction. The inlet position of the first flow channel (2311) is higher than the outlet position of the first flow channel (2311). The fluid flows in a tortuous manner from top to bottom along the first flow channel (2311). And / or, the inlet and outlet of the second flow channel (2321) are distributed on both sides of the second cold plate (232) along the X direction, and the fluid flows in a straight line along the second flow channel (2321).

4. The battery pack according to claim 1, characterized in that, The first liquid cooling plate (21) has a first liquid cooling channel (211) inside, and the second liquid cooling plate (22) has a second liquid cooling channel (221) inside. The first liquid cooling channel (211) and the second liquid cooling channel (221) are not connected.

5. The battery pack according to claim 1, characterized in that, Each layer is provided with at least two of the battery packs (11) and arranged along the Y direction, and the liquid cooling assembly (20) further includes: A central liquid cooling plate (24) includes a third cold plate (241) and a fourth cold plate (242) connected vertically. The third cold plate (241) is disposed between two adjacent rows of battery packs (11) arranged along the Y direction and is parallel to the first cold plate (231). The fourth cold plate (242) is disposed between two adjacent layers of battery packs (11) arranged along the Z direction and is parallel to the second cold plate (232).

6. The battery pack according to claim 5, characterized in that, The third cold plate (241) has a third flow channel (2411) inside, and the fourth cold plate (242) has a fourth flow channel (2421) inside. The third flow channel (2411) and the fourth flow channel (2421) are not connected.

7. The battery pack according to claim 6, characterized in that, The third cold plate (241) includes at least two interconnected third flow channels (2411), which are distributed on both sides of the fourth cold plate (242) along the Z direction. The inlet and outlet of the third flow channel (2411) are located on the same side of the third cold plate (241) and are arranged on both sides of the fourth cold plate (242) along the Z direction. The inlet position of the third flow channel (2411) is higher than the outlet position of the third flow channel (2411), and the fluid flows in a tortuous manner from top to bottom along the third flow channel (2411). The fourth cold plate (242) includes at least two interconnected fourth flow channels (2421), which are distributed on both sides of the third cold plate (241) along the Y direction. The inlet and outlet of the fourth flow channel (2421) are located on the same side of the fourth cold plate (242) and are arranged on both sides of the third cold plate (241) along the Y direction. The fluid flows in a tortuous manner from one side of the third cold plate (241) to the other side along the fourth flow channel (2421).

8. The battery pack according to claim 6, characterized in that, The first cold plate (231) has a first flow channel (2311) inside, and the third flow channel (2411) is connected to the first flow channel (2311); The second cold plate (232) has a second flow channel (2321) inside, and the fourth flow channel (2421) is connected to the second flow channel (2321).

9. The battery pack according to claim 8, characterized in that, The liquid cooling assembly (20) further includes a first liquid inlet pipe (251) and a first liquid return pipe (252). The inlet of the third flow channel (2411) and the inlet of the first flow channel (2311) are both connected to the first liquid inlet pipe (251). The outlet of the third flow channel (2411) and the outlet of the first flow channel (2311) are both connected to the first liquid return pipe (252). The first liquid inlet pipe (251) and the first liquid return pipe (252) are disposed on one side of the battery module (10) along the X direction. The liquid cooling assembly (20) also includes a connector (26), through which the fourth flow channel (2421) and the second flow channel (2321) are connected. The connector (26) is located on the other side of the battery module (10) along the X direction.

10. The battery pack according to any one of claims 1-9, characterized in that, The liquid cooling assembly (20) further includes an inlet pipe (271) and a return pipe (272), the inlet pipe (271) and the return pipe (272) being disposed on the same side of the battery module (10) along the X direction, the inlet pipe (271) having at least two supply ports (2711) and the return pipe (272) having at least two return ports (2721).

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