CN116666879A

CN116666879A - Battery module

Info

Publication number: CN116666879A
Application number: CN202310632327.XA
Authority: CN
Inventors: 田原松
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-05-30
Filing date: 2023-05-30
Publication date: 2023-08-29

Abstract

The application relates to a battery module, comprising: each cell group comprises at least two rows of cells, at least two rows of cell frames and at least one straight heat conducting piece; and a cooling assembly located at the end of the cell group; each electric core frame is provided with a frame body top and a frame body side part connected with the side edge of the frame body top, and is provided with a mounting cavity penetrating through the frame body top to mount a corresponding electric core, and a heat conduction hollowed-out hole penetrating through the frame body side part and communicated with the mounting cavity to mount a heat transfer body; the straight heat conducting piece comprises a first middle part and a first extension part connected with the first middle part, the first middle part of each straight heat conducting piece is positioned between two adjacent rows of electric core frames and is connected with the corresponding two rows of electric cores in a heat conducting manner through a heat conducting body, and the extension part of the straight heat conducting piece is connected with the cooling assembly in a heat conducting manner. By adopting a plurality of straight heat conducting pieces, the application can save welding current collectors at two ends of the straight heat conducting pieces, reduce manufacturing cost, enhance structural stability of the battery module and improve assembly efficiency.

Description

Battery module

Technical Field

The application relates to the technical field of batteries, in particular to a battery module.

Background

In the related art, a large cylindrical battery module mainly comprises a cylindrical battery cell, a coiled pipe, a bottom battery cell tray and a plurality of pipeline connectors. The coiled pipe is formed by rolling a strip-shaped harmonica pipe, the middle part of the coiled pipe is S-shaped, the two ends of the coiled pipe are straight sections, and current collectors are welded at the two ends of the coiled pipe. The S-shaped pipe section in the middle of the coiled pipe is attached to the cylindrical battery cell, and heat-conducting glue is coated between the S-shaped pipe section of the coiled pipe and the cylindrical battery cell.

However, the structure of the above battery module has various problems: (1) The coiled pipe is generally made of 3-series aluminum materials, has low strength and is easy to deform, and can not be used as a structural member for bearing the battery core; (2) S-shaped middle processing of the coiled pipe has the problems of processing error, low processing efficiency and the like, and current collectors are required to be welded at two ends, so that the cost of parts of the coiled pipe is higher; (3) Cylindrical battery cells are arranged on two side surfaces of the coiled pipe, and when the battery cells are out of control, the thermal runaway of the adjacent battery cells is easily caused; (4) The battery module is installed in the tray to the thicker structural adhesive of spraying, the flange face of tray is installed on the step of box, causes tray structure spare cost and spouts gluey cost height.

Disclosure of Invention

In view of this, the present application provides a battery module, which can omit welding current collectors at two ends of a straight heat conducting member, reduce manufacturing cost, enhance structural stability of the battery module, and improve assembly efficiency.

In a first aspect, an embodiment of the present application provides a battery module including: each cell group comprises at least two rows of cells, at least two rows of cell frames and at least one straight heat conducting piece; and a cooling assembly located at an end of the cell stack; each electric core frame is provided with a frame top and a frame side part connected with the side edge of the frame top, and is provided with a mounting cavity penetrating through the frame top to mount the corresponding electric core, and a heat conduction hollowed-out hole penetrating through the frame side part and communicated with the mounting cavity to mount a heat transfer body; the heat transfer members include a first middle portion and a first extension portion connected to the first middle portion, the first middle portion of each heat transfer member is located between two adjacent rows of the cell frames and is connected to the corresponding two rows of the cells in a heat conduction manner through the heat transfer bodies, and the extension portion of each heat transfer member is connected to the cooling assembly in a heat conduction manner.

By adopting a plurality of straight heat conducting pieces, arranging the middle parts of the straight heat conducting pieces between two adjacent rows of electric core frames, connecting a heat transfer body to two corresponding rows of electric cores in a heat conducting manner, and connecting the extension parts of the straight heat conducting pieces to a cooling assembly in a heat conducting manner, the application can save welding current collectors at two ends of the straight heat conducting pieces, reduce the manufacturing cost, enhance the structural stability of the battery module and improve the assembly efficiency.

Drawings

The technical solution and other advantageous effects of the present application will be made apparent by the following detailed description of the specific embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a plan view illustrating a structure of a battery module according to an embodiment of the present application;

fig. 2 shows a first exploded view of a battery module according to an embodiment of the present application;

FIG. 3 shows a schematic diagram of a cell stack according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a cell mounted to a cell frame according to an embodiment of the present application;

FIG. 5 shows a schematic diagram of a heat transfer body according to an embodiment of the present application;

fig. 6 shows a schematic diagram of a plurality of die frame arrangements in accordance with an embodiment of the present application;

FIG. 7 shows a schematic view of a cell support plate according to an embodiment of the present application;

FIG. 8 is a schematic view of a glue tank according to an embodiment of the application;

fig. 9 shows a second exploded view of the battery module according to the embodiment of the present application;

FIG. 10 shows a schematic view of a lower seal assembly of an embodiment of the present application;

FIG. 11 shows a schematic view of an upper seal assembly of an embodiment of the present application;

fig. 12 shows a third exploded view of a battery module according to an embodiment of the present application;

fig. 13 shows a schematic view of a reverse placement of a battery module according to an embodiment of the present application;

in the figure:

1-a battery box body; 12-a first step surface; 14-a second step surface; 13-a first sub-sidewall; 15-a second sub-sidewall; 11-channel; 10-a first sidewall;

2-a cooling assembly; 21-an upper housing; 22-a lower housing; 211-bottom of upper housing; 2110—side edges of the upper housing bottom; 212-a first side; 222-a second side; 223-a third side; 2121-upper cavity; 2122-upper attachment slots; 221-top of lower housing; 2210—the side edges of the lower housing top; 2221-lower cavity; 2222-lower connection slot; 2123-upper clip groove; 2223-lower card slot; 23-upper seal assembly; 24-a lower seal assembly; 230-upper seal; 2301-an upper connection; 2302-an upper seal; 2401-a lower connection; 2402-a lower seal; 241—a main connection; 220-sealing the groove;

3-cell groups; 30-an electric core;

40-a cell frame; 41-top of the frame; 410-side edges of the top of the die frame; 42-frame side; 400-mounting cavity; 420-heat conduction hollowed-out holes; 421—a heat transfer body; 422-first heat insulation hollowed-out holes; 423-a second heat insulation hollowed-out hole; 411-first boss; 412-a second boss; 45-the bottom of the frame body; 450-cell support; 451-projections;

5-a straight heat conduction member; 50-mounting surface; 51-a first middle portion; 52-a first extension;

6-frame; 61-fourth side; 62-bolts; 63-a first flange; 64-a second sidewall; 65-a second flange;

7-a cell support plate; 71-a second middle portion; 72-a second extension;

810-through holes; 830-a first smoke evacuation channel; 840-a second smoke evacuation channel.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the present application, it should be noted that, unless explicitly stated otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements or interaction relationship between the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The following disclosure provides many different embodiments, or examples, for implementing different features of the application. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials. In some instances, well known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present application.

Fig. 1 shows a plan view structural diagram of a battery module according to an embodiment of the present application. As shown in fig. 1, the battery module includes a battery case 1, a cooling module 2, and a plurality of battery cells 3 in a plan view. Wherein, the battery case 1 may be provided with an accommodating space for accommodating the cooling assembly 2 and the plurality of battery cell groups 3.

In one embodiment, a plurality of the battery cell groups 3 are installed in the accommodating space. Each of the cell groups 3 comprises at least two rows of cells 30, at least two rows of cell frames 40 and at least one straight heat conducting member (not shown in fig. 1). For example, in fig. 1 the battery module comprises 8 rows of cells 30, 4 cell groups in total. It will be appreciated that the number of cell rows in the cell group 3 may be set as required, which is not limited in this regard.

Fig. 2 shows a first exploded view of a battery module according to an embodiment of the present application. Referring to fig. 2, the straight heat conductive member 5 may have a planar shape and extend in the row direction (i.e., x direction) of the cell arrangement in fig. 2. The height of the heat-direct conduction member 5 in the z-direction may be smaller than the height of the battery cell 30 in the z-direction. The plurality of heat-direct conduction members 5 may be sequentially arranged along the column direction (i.e., y direction) in which the electric cells are arranged in fig. 2. By adopting the straight heat conduction piece to form the harmonica pipe instead of using the serpentine pipe with the middle deformed into the S shape, the embodiment of the application can save welding of current collectors at two ends of the straight heat conduction piece and reduce the manufacturing cost.

In an embodiment, the heat-conducting member 5 may be made of 6 series aluminum materials, so that the strength is good, the battery cells can be supported, the battery cells do not move downwards, a battery cell tray is omitted, and thick structural adhesive is not required to be sprayed on the bottom of the battery cells and the tray.

Fig. 3 shows a schematic diagram of a cell stack according to an embodiment of the application. Referring to fig. 2 and 3, the heat-direct conduction member 5 includes a first middle portion 51 and a first extension portion 52 connected to the first middle portion 51. The first middle part 51 is located between two adjacent rows of the battery cells 30 and is arranged corresponding to the two adjacent rows of the battery cells 30; the first extension portion 52 is a portion of the heat-conducting member 5 extending out of the adjacent two rows of the cells 30. In fig. 3, a portion of the straight heat conductive member 5 located on the left side of the battery cell 30, which protrudes, is illustrated as a first extension portion 52.

Fig. 4 is a schematic diagram showing that a cell according to an embodiment of the present application is mounted on a cell frame. Referring to fig. 3 and 4, each of the battery cells 30 may be mounted in the battery cell frame 40. The cells 30 may be inserted into the cell frame 40 during cell grouping. Each of the battery cell frames 40 has a frame top 41 and a frame side 42 connected to a side edge 410 of the frame top 41, and a mounting cavity 400 penetrating the frame top 41 is provided to mount the corresponding battery cell 30. The side edge 410 of the frame top 41 may be one end of the frame top 41.

Each of the electric core frames 40 is further provided with a heat conducting hollow hole 420 penetrating through the side portion 42 of the frame body and communicating with the mounting cavity 400, so as to mount a heat conducting body. Taking fig. 4 as an example, the die frame 40 may have four sides, and the middle of each side is hollowed out, where the hollowed-out hole of one side is the heat conducting hollowed-out hole 420.

Fig. 5 shows a schematic diagram of a heat transfer body according to an embodiment of the application. Specifically, fig. 5 shows a state in which the heat transfer body 421 is attached to the side portion of the circuit frame 40 and a state in which the heat transfer body 421 is detached from the side portion of the circuit frame 40. In practical applications, the heat transfer body 421 may be filled in the heat-conducting hollow hole 420 of the electric core frame 40.

In an embodiment, the first middle portion 51 of each of the heat-direct conduction members 5 is located between two adjacent rows of the cell frames 40 and is thermally connected to the corresponding two rows of the cells 30 through the heat transfer body 421, and the first extension portion 52 of the heat-direct conduction member 5 is thermally connected to the cooling assembly 2.

In one embodiment, the cooling assembly 2 is installed in the accommodating space and located at the ends of the plurality of the battery cell groups 3. As shown in fig. 2, the cooling assemblies 2 may be disposed at both ends of the battery cell group 3 to dissipate heat from a plurality of battery cell groups 3.

Fig. 6 shows a schematic diagram of a plurality of die frame arrangements in accordance with an embodiment of the present application. Referring to fig. 6, from a top view, each of the electric core frames 40 is provided with a first heat insulation hollow hole 422 and two second heat insulation hollow holes 423 penetrating through the frame side 42 and communicating with the mounting cavity 400, and heat insulators are installed in the first heat insulation hollow hole 422 and the two second heat insulation hollow holes 423.

In an embodiment, the first heat insulation hollow holes 422 and the heat conduction hollow holes 420 are disposed opposite to each other in the row direction (i.e. the extending direction or the x direction of the heat-direct conduction member 5), and the two first heat insulation hollow holes 422 of two adjacent battery cell groups 3 are disposed opposite to each other; the two second heat-insulating hollow holes 423 are oppositely disposed in a column direction (i.e., perpendicular to the extending direction or the y direction of the heat-conducting member 5), and at least one second heat-insulating hollow hole 423 is disposed between two adjacent cells 30 in the same row, where the row direction and the column direction are disposed in a crossing manner. Illustratively, the row direction is disposed perpendicularly across the column direction.

In the present application, for the electric core frame 40, the hollow hole contacting the heat-conducting member 5 may be referred to as the heat-conducting hollow hole 420, the hollow hole parallel to the heat-conducting member 5 and far from the heat-conducting member 5 may be referred to as the first heat-insulating hollow hole 422, and the hollow hole perpendicular to the heat-conducting member 5 may be referred to as the second heat-insulating hollow hole 423. The heat conducting hollow hole 420, the first heat insulating hollow hole 422 and the second heat insulating hollow hole 423 may have the same shape.

Fig. 7 shows a schematic view of a cell support plate according to an embodiment of the application. As shown in fig. 7, the battery module further includes a plurality of cell support plates 7, each of the cell support plates 7 includes a second middle portion 71 and a second extension portion 72 connected to the second middle portion 71, and the second middle portion 71 is located between two adjacent cell groups and supports the two adjacent cell groups, such as the cell groups 31 and 32 in fig. 7. The shape of the cell support plate 7 may be the same as that of the straight heat conductive member 5, and the top of the cell support plate 7 also has a bearing surface to support the boss of the cell frame.

Referring to fig. 4 and 5, the side portion 42 of the frame of each battery cell 40 is further provided with a first boss 411 and a second boss 412 disposed opposite to each other, the first boss 411 is adjacent to the heat-conducting hollow hole 420, and the second boss 412 is adjacent to the first heat-insulating hollow hole 422; wherein the first middle portion 51 of each heat-conducting member 5 supports the first bosses 411 of two adjacent rows of the cell frames 40, and each cell support plate 7 supports the second bosses 412 of two adjacent cell groups 3. For example, in fig. 3, the top of the heat-direct conduction member 5 may be a mounting surface 50, and the mounting surface 50 may support the first bosses 411 of two adjacent rows of the die frames 40.

Through mounting the boss of the battery cell frame on the straight heat conducting piece and the battery cell supporting plate, the embodiment of the application can bear a plurality of battery cells without using a tray and gluing at the bottom of the battery cells, thereby further reducing the manufacturing cost and facilitating the assembly of the battery module.

In one embodiment, the heat transfer body may be a heat transfer gel and the heat insulator may be a heat insulating structural gel. Taking fig. 6 as an example, the four side hollow portions of the battery cell 30 and the battery cell frame 40 form 4 glue grooves. For example, a first glue containing groove is formed between the heat conducting hollow hole 420 and the electric core 30, the first heat insulating hollow hole 422 and the two second heat insulating hollow holes 423 form a second glue containing groove. Wherein the heat transfer body can be injected into the first glue containing groove contacted with the heat-direct conduction member 5, and the rest 3 second glue containing grooves can be injected into the heat insulation body. Wherein, thermal-insulated structural adhesive still helps further reinforcing battery module inside structural stability.

Fig. 8 shows a schematic view of a glue tank according to an embodiment of the application. As shown in fig. 8, the heat-conducting member 5 may support the first boss 411, and the glue-accommodating groove on the left side of the electric core frame 40 may be a second glue-accommodating groove to accommodate the heat-insulating structural glue 4200; the glue groove on the right side of the electric core frame 40 may be a first glue groove to hold the heat-conducting glue. In addition, the bottom 45 of the cell frame 40 in fig. 8 may also be provided with a cell support 450 to carry the cells placed in the cell frame.

In one embodiment, the plurality of the electric cells 30 are separated by the heat insulator, and the electric cells 30 and the heat-conducting member 5 are separated by the heat conductor. When the electric core 30 is out of control, the heat of the electric core 30 cannot be conducted to other electric cores, the heat transfer path of the electric core is reduced, and meanwhile, the heat can be conducted out through the straight heat conducting piece 5, so that the problem of heat transfer of the electric core out of control is solved, and the safety of the battery is improved.

Fig. 9 shows a second exploded view of the battery module according to the embodiment of the present application, and fig. 9 is different from the viewing angle of fig. 2. Referring to fig. 9 and 2, the cooling module 2 includes an upper case 21 and a lower case 22 connected to each other, and the upper case 21 and the lower case 22 may be engaged with each other to form the cooling module 2.

In one embodiment, referring to fig. 9, the upper housing 21 includes a bottom 211 and a first side 212 connected to a side edge 2110 of the bottom 211, and is provided with an upper cavity 2121 penetrating the bottom 211, and a plurality of upper connection slots 2122 penetrating the first side 212 and communicating with the upper cavity 2121.

In an embodiment, with continued reference to fig. 9, the lower housing 22 includes a top 221 and a second side 222 connected to a side edge 2210 of the top 221, and is provided with a lower cavity 2221 penetrating the top 221, and a plurality of lower connection grooves 2222 penetrating the second side 222 and communicating with the lower cavity 2221.

In an embodiment, the upper cavity 2121 and the lower cavity 2221 are in communication with each other to receive a cooling medium, and the first extension 52 of each of the heat-direct conductors 5 extends into the corresponding upper connection groove 2122 and the lower connection groove 2222 to be thermally connected to the cooling medium.

In an embodiment, referring to fig. 9, the upper housing 21 is further provided with a plurality of upper clamping grooves 2123 penetrating the first side 212 and spaced from the upper cavity 2121, the lower housing 22 is further provided with a plurality of lower clamping grooves 2223 penetrating the second side 222 and spaced from the lower cavity 2221, and the second extension portion 72 of each of the cell support plates 7 is clamped into the corresponding upper clamping groove 2123 and the corresponding lower clamping groove 2223.

Fig. 10 shows a schematic view of a lower seal assembly of an embodiment of the present application, and fig. 11 shows a schematic view of an upper seal assembly of an embodiment of the present application. As shown in fig. 10 and 11, the cooling module 2 further includes an upper seal module 23 and a lower seal module 24. When assembled, the upper seal assembly 23 may be received in the upper coupling groove 2122 in the upper housing 21 and the lower seal assembly 24 may be received in the lower coupling groove 2222 in the lower housing 22, and then the assembled upper seal assembly 23 and lower seal assembly 24 may be aligned to complete the assembly of the upper housing 21 and the lower housing 22.

In an embodiment, referring to fig. 11, the upper sealing assembly 23 includes a plurality of upper sealing members 230, each upper sealing member 230 includes two upper connection portions 2301 and an upper sealing portion 2302 connected between the two upper connection portions 2301 in a bending manner, the two upper connection portions 2301 are connected to the upper housing 21, and the upper sealing portions 2302 are located in the corresponding upper connection grooves 2122 and into which the first extension portions 52 of the corresponding heat-conductive members extend.

In an embodiment, the lower sealing assembly 24 includes a plurality of lower sealing members 240, each lower sealing member 240 includes two lower connecting portions 2401 and a lower sealing portion 2402 connected between the two lower connecting portions 2401 in a bending manner, the two lower connecting portions 2401 are connected to the lower housing 22, the lower sealing portions 2402 are located in the corresponding lower connecting grooves 2222 and are provided for the first extending portions 52 of the corresponding heat-conducting members 5 to extend into, and each two upper connecting portions 2301 are connected to the corresponding two lower connecting portions 2401.

Further, as shown in fig. 10, the lower sealing assembly 24 further includes a plurality of main connection portions 241, and two ends of each main connection portion 241 are respectively connected between two lower connection portions 2401 of two adjacent lower sealing members 240. Further, as shown in fig. 9, the lower case 22 is further provided with a sealing groove 220, and the plurality of main connection portions 241 and the plurality of lower connection portions 2401 of the lower seal assembly are mounted in the sealing groove 220. The main connection portion 241 may be pre-installed at the lower sealing assembly 24.

In one embodiment, the upper seal 2302 and the lower seal 2402 are U-shaped. As shown in fig. 11, the upper sealing portion 2302 and the lower sealing portion 2402 may be combined with each other to form a U-shaped space, so that the straight heat conducting member 5 and the cell support plate 7 may extend into each other, and thus the fixing of the straight heat conducting member 5 and the cell support plate 7 may be facilitated, the stability of the straight heat conducting member 5 and the cell support plate 7 may be improved, and the assembly may be simpler and more convenient.

When the upper and lower cases 21 and 22 are assembled, the first extension portion 52 of the heat-conducting member 5 may be first inserted into the corresponding lower connection groove 2222, the second extension portion 72 of the cell support plate 7 may be inserted into the corresponding lower clamping groove 2223, and after the assembly, the upper connection groove 2122 may be clamped to the first extension portion 52 of the heat-conducting member 5, and the upper clamping groove 2123 may be clamped to the second extension portion 72 of the cell support plate 7. And then the bolts are fixedly installed, so that the sealing of the battery module liquid cooling system can be formed.

By forming the cooling module 2 by combining the upper sealing part and the lower sealing part with each other, the embodiment of the application does not need to install a pipe joint such as liquid cooling, thereby saving an installation process and improving the assembly efficiency.

Fig. 12 shows a third exploded view of the battery module according to the embodiment of the present application. Further, referring to fig. 12, the lower case 22 further includes a third side portion 223 opposite to the second side portion 222, and is provided with a through hole 810 penetrating the third side portion 223, and the battery cells 30 of the plurality of battery cell groups 3 and the frame bottom 45 of the battery cell frame 40 enclose a circulation cavity with the battery case 1.

The battery box 1 comprises a first side wall 10, the first side wall comprises a first sub side wall 13 and a second sub side wall 15, the first side wall 10 surrounds the accommodating space, the first side wall 10 is provided with a channel 11 communicated with the accommodating space, and the through hole 810 is communicated between the circulation cavity and the channel 11. The through holes 810 and the channels 11 may each be square. When thermal runaway occurs in the battery cell, smoke generated by the thermal runaway can enter the channel 11 through the through hole 810 and flow in the profile of the battery box 1, and is discharged through an explosion-proof valve arranged outside the battery box 1.

Referring to fig. 9 and 12, the battery module further includes a frame 6 located at the sides of the plurality of battery cells 3, and the frame 6 includes a top and a fourth side 61 connected to the side edge of the top and far from the plurality of battery cells. When assembled, the first side 212 and the second side 222 are attached to the glue containing surface of the die frame 40, and the fourth side 61 of the frame 6 is also attached to the glue containing surface of the die frame 40. The bezel 6 may be mounted and secured to the lower seal assembly 24 by bolts 62.

Fig. 13 shows a schematic diagram of the reverse placement of the battery module according to the embodiment of the application. As shown in fig. 4 and 13, the battery cell frame 40 further has a frame bottom 45 connected to the frame side 42 and opposite to the frame top 41, the frame bottom 45 is provided with a protrusion 451, and the protrusion 451 abuts against the battery case 1 so that the battery cell 30 and the battery cell frame 40 and the battery case 1 enclose the circulation cavity.

Further, referring to fig. 13, the battery module further includes a plurality of first smoke exhaust passages between an end surface of the heat direct conduction member 5 and a bottom surface of the second side portion 222 of the lower case 22, and a plurality of second smoke exhaust passages between an end surface of the battery cell support plate 7 and a bottom surface of the second side portion 222 of the lower case 22. For example, in fig. 13, the lower end surface of the heat-direct conduction member 5 is spaced from the bottom surface of the second side portion 222 of the lower case 22 to form a first smoke exhaust passage 830; the lower end surface of the cell support plate 7 is spaced from the bottom surface of the second side 222 of the lower housing 22 to form a second smoke exhaust channel 840. After the plurality of battery cell packs 3 are assembled into the battery case 1, a space for accommodating the flue gas can be formed between the 4 protrusions 451 on the battery cell frame and the bottom of the case, and the flue gas flows between the protrusions 451 and flows out to the through holes 810 of the battery case through the first smoke exhaust channel 830 and the second smoke exhaust channel 840, so as to prevent further damage caused by excessive pressure when the internal thermal runaway of the battery cell packs occurs.

Further, as shown in fig. 12, the top of the rim 6 is provided with a first flange 63 beyond the fourth side portion 61, and the top of the lower housing 22 of the cooling module 2 is provided with a second flange 65 beyond the third side portion 223.

The battery box further includes a second side wall 64, the second side wall 64 is connected to the first side wall 10 through a step surface, and surrounds the accommodating space together with the first side wall 10, the fourth side portion 61 of the frame 6 and the third side portion 223 of the lower case 22 abut against the first side wall 10, and the first flange 63 and the second flange 65 cover the step surface. Specifically, the first flange 63 is mounted to the second step surface 14, and the second flange 65 is mounted to the first step surface 12. The frame 6 is attached to the first sub-side wall 13 and the second sub-side wall 15 of the battery box 1, so as to ensure that the plurality of battery cell groups do not shake in the box.

The side beam of the battery module is formed by utilizing the frame and the cooling component, and the frame and the cooling component are arranged on the step of the battery box body.

In summary, in the embodiment of the application, the plurality of straight heat conducting pieces are adopted, the middle parts of the straight heat conducting pieces are arranged between two adjacent rows of electric core frames, the heat transfer bodies are connected with two corresponding rows of electric cores in a heat conducting manner, and the extension parts of the straight heat conducting pieces are connected with the cooling assembly in a heat conducting manner, so that the current collectors can be omitted from being welded at two ends of the straight heat conducting pieces, the manufacturing cost is reduced, the structural stability of the battery module is enhanced, and the assembly efficiency is improved.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The above description of the battery module provided by the embodiment of the present application has been provided in detail, and specific examples are applied to illustrate the principles and embodiments of the present application, and the above description of the embodiment is only for helping to understand the technical solution and core idea of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. A battery module, comprising:

each cell group (3) comprises at least two rows of cells (30), at least two rows of cell frames (40) and at least one straight heat conducting piece (5); and

a cooling assembly (2) located at the end of the cell group (3);

each electric core frame (40) is provided with a frame top (41) and a frame side (42) connected with a side edge (410) of the frame top (41), and is provided with a mounting cavity (400) penetrating through the frame top (41) for mounting the corresponding electric core (30), and a heat conduction hollowed-out hole (420) penetrating through the frame side (42) and communicated with the mounting cavity (400) for mounting a heat transfer body (421);

the heat-conducting members (5) comprise a first middle part (51) and a first extension part (52) connected to the first middle part (51), the first middle part (51) of each heat-conducting member (5) is located between two adjacent rows of the electric core frames (40) and is connected to two corresponding rows of the electric cores (30) in a heat conduction mode through the heat transfer bodies (421), and the extension parts (52) of the heat-conducting members (5) are connected to the cooling assembly (2) in a heat conduction mode.

2. The battery module according to claim 1, wherein each of the battery core frames (40) is provided with a first heat insulation hollowed-out hole (422) and a second heat insulation hollowed-out hole (423) penetrating through the side part (42) of the frame body and communicating with the mounting cavity (400), and heat insulators are mounted in the first heat insulation hollowed-out hole (422) and the second heat insulation hollowed-out hole (423); the first heat-insulating hollow holes (422) and the heat-conducting hollow holes (420) are oppositely arranged in the row direction, the second heat-insulating hollow holes (423) are oppositely arranged in the column direction, at least one second heat-insulating hollow hole (423) is located between two adjacent electric cores (30) in the same row, and the row direction and the column direction are arranged in a crossing mode.

3. The battery module according to claim 2, further comprising a plurality of cell support plates (7), each cell support plate (7) comprising a second middle portion (71) and a second extension portion (72) connected to the second middle portion (71), the second middle portion (71) being located between two adjacent cell groups (3) and supporting two adjacent cell groups (3).

4. The battery module according to claim 3, wherein the frame side (42) of each of the battery cell frames (40) is further provided with a first boss (411) and a second boss (412) disposed opposite to each other, the first boss (411) being adjacent to the heat-conducting hollow hole (420), the second boss (412) being adjacent to the first heat-insulating hollow hole (422); wherein the first middle part (51) of each straight heat conducting piece (5) supports the first bosses (411) of two adjacent rows of the cell frames (40), and each cell supporting plate (7) supports the second bosses (412) of two adjacent cell groups (3).

5. A battery module according to claim 3, wherein the cooling assembly (2) comprises an upper case (21) and a lower case (22) connected to each other, the upper case (21) comprising a bottom (211) and a first side (212) connected to a side edge (2110) of the bottom (211), and being provided with an upper cavity (2121) penetrating the bottom (211), and a plurality of upper connection grooves (2122) penetrating the first side (212) and communicating with the upper cavity (2121); the lower housing (22) comprises a top (221) and a second side (222) connected to a side edge (2210) of the top (221), and is provided with a lower cavity (2221) penetrating the top (221), and a plurality of lower connecting grooves (2222) penetrating the second side (222) and communicating with the lower cavity (2221); wherein the upper cavity (2121) and the lower cavity (2221) are mutually communicated to accommodate a cooling medium, and the first extension portion (52) of each of the heat-direct-conduction members (5) extends into the corresponding upper connection groove (2122) and lower connection groove (2222) to be connected to the cooling medium in a heat-conducting manner.

6. The battery module according to claim 5, wherein the upper case (21) is further provided with a plurality of upper clamping grooves (2123) penetrating the first side portion (212) and disposed at intervals with the upper cavity (2121), the lower case (22) is further provided with a plurality of lower clamping grooves (2223) penetrating the second side portion (222) and disposed at intervals with the lower cavity (2221), and the second extension portion (72) of each cell support plate (7) is clamped into the corresponding upper clamping groove (2123) and lower clamping groove (2223).

7. The battery module according to claim 5, wherein the cooling assembly (2) further comprises an upper seal assembly (23) and a lower seal assembly (24); the upper sealing assembly (23) comprises a plurality of upper sealing elements (230), each upper sealing element (230) comprises two upper connecting parts (2301) and an upper sealing part (2302) connected between the two upper connecting parts (2301) in a bending way, the two upper connecting parts (2301) are connected to the upper shell (21), and the upper sealing parts (2302) are positioned in the corresponding upper connecting grooves (2122) and are provided for the first extending parts (52) of the corresponding heat-direct conducting elements (5) to extend in; the lower sealing assembly (24) comprises a plurality of lower sealing elements (240), each lower sealing element (240) comprises two lower connecting parts (2401) and lower sealing parts (2402) connected between the two lower connecting parts (2401) in a bending mode, the two lower connecting parts (2401) are connected to the lower shell (22), the lower sealing parts (2402) are located in corresponding lower connecting grooves (2222) and are used for the first extending parts (52) of the corresponding heat-direct conducting elements (5) to extend in, and each two upper connecting parts (2301) are connected to the corresponding two lower connecting parts (2401).

8. The battery module according to claim 7, wherein the lower sealing assembly (24) further comprises a plurality of main connection parts (241), and both ends of each main connection part (241) are respectively connected between two lower connection parts (2401) of two adjacent lower sealing members (240); the lower housing (22) is further provided with a sealing groove (220), and a plurality of main connecting portions (241) and a plurality of lower connecting portions (2401) of the lower seal assembly (24) are mounted in the sealing groove (220).

9. The battery module according to claim 7, wherein the upper sealing part (2302) and the lower sealing part (2402) are U-shaped.

10. The battery module according to claim 5, wherein the lower case (22) further includes a third side portion (223) opposite to the second side portion (222), and is provided with a through hole (810) penetrating the third side portion (223), the cell frame (40) further has a frame bottom portion (45) connected to the frame side portion (42) and opposite to the frame top portion (41), the cells (30) of the plurality of cell groups (3) and the frame bottom portion (45) of the cell frame (40) enclose a flow-through cavity with the battery case (1), the battery case (1) includes a first side wall (10), the first side wall (10) is provided with a passage (11), and the through hole (810) is communicated between the flow-through cavity and the passage (11).

11. The battery module according to claim 10, wherein the frame body bottom (45) is provided with a protrusion (451), and the protrusion (451) abuts against the battery case (1) so that the battery cell (30) and the battery cell frame (40) and the battery case (1) enclose the circulation cavity.

12. The battery module according to claim 6, further comprising a plurality of first smoke evacuation channels (830) and a plurality of second smoke evacuation channels (840), wherein the first smoke evacuation channels (830) are located between an end face of the heat direct conduction member (5) and a bottom face of the second side portion (222) of the lower case (22), and the second smoke evacuation channels (840) are located between an end face of the cell support plate (7) and a bottom face of the second side portion (222) of the lower case (22).

13. The battery module according to claim 10, further comprising a frame (6) located at a side portion of the plurality of cell groups (3), the frame (6) comprising a top portion and a fourth side portion (61) connected to a side edge of the top portion and distant from the plurality of cell groups (3), the top portion of the frame (6) being provided with a first flange (63) exceeding the fourth side portion (61), the top portion of the lower case (22) of the cooling assembly (2) being provided with a second flange (65) exceeding the third side portion (223), the battery case (1) further comprising a second side wall (64), the second side wall (64) being connected to the first side wall (10) by a step surface, the fourth side portion (61) of the frame (6) and the third side portion (223) of the lower case (22) abutting the first side wall (10), the first flange (63) and the second flange (65) covering the step surface.