CN115224395B

CN115224395B - Battery module

Info

Publication number: CN115224395B
Application number: CN202211140250.6A
Authority: CN
Inventors: 范标; 熊院情; 莫珊
Original assignee: Guangdong Cairi Energy Technology Co ltd
Current assignee: Guangdong Cairi Energy Technology Co ltd
Priority date: 2022-09-20
Filing date: 2022-09-20
Publication date: 2022-12-02
Anticipated expiration: 2042-09-20
Also published as: CN115224395A

Abstract

The invention provides a battery module, which relates to the technical field of batteries and comprises a first battery module, a second battery module and a ventilation device, wherein a flow guide assembly is arranged between the first battery module and the second battery module; a middle diversion channel communicated with the first ventilation mechanism is formed among the first battery module, the second battery module and the diversion assembly, and an upper diversion channel communicated with the second ventilation mechanism and/or a lower diversion channel communicated with the third ventilation mechanism are also formed. The battery module provided by the invention improves the temperature uniformity among the battery cores at different positions, realizes more uniform heat dissipation of a single battery core and has long service life.

Description

Battery module

Technical Field

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

Background

Energy storage system is when high multiplying power charge-discharge, the electric core of battery module can produce a large amount of heats, battery module often disposes single ventilation cooling device among the prior art, heat abstractor is located one side of battery module, this just leads to the electric core heat dissipation in the battery module abundant inadequately, influence the life-span of electric core, and because each electric core is different with ventilation cooling device's distance, can make to form great difference in temperature between the electric core, lead to electric core temperature uniformity poor, can influence the uniformity of electric core voltage, thereby shorten the life of battery module easily, influence user's use.

Disclosure of Invention

The invention aims to provide a battery module, which improves the temperature uniformity among battery cores at different positions, can realize more uniform heat dissipation of a single battery core and has long service life.

In order to realize the purpose, the invention provides the following technical scheme:

the invention provides a battery module, which comprises a first battery module, a second battery module and a ventilation device, and is characterized in that a flow guide assembly is arranged between the first battery module and the second battery module, and the ventilation device comprises a first ventilation mechanism positioned on one side of the flow guide assembly and a second ventilation mechanism and/or a third ventilation mechanism positioned on the other side of the flow guide assembly;

and a middle diversion channel communicated with the first ventilation mechanism is formed among the first battery module, the second battery module and the diversion assembly, and an upper diversion channel communicated with the second ventilation mechanism and/or a lower diversion channel communicated with the third ventilation mechanism are also formed.

Furthermore, the first battery module and the second battery module respectively comprise a plurality of sequentially arranged battery cells, and a spacer is clamped between two adjacent battery cells;

a plurality of convex strips are convexly arranged on two sides of the spacer piece facing the battery core, a flow guide groove is formed between every two adjacent convex strips, and the flow guide groove and the flow guide assembly form the middle flow guide channel;

the space at the top end of the spacer and the flow guide assembly form the upper flow guide channel, and/or the space at the bottom end of the spacer and the flow guide assembly form the lower flow guide channel.

Furthermore, the first battery module and the second battery module further comprise an upper air guide shell and/or a lower air guide shell, the upper air guide shell is buckled at the top ends of the plurality of battery cells and provided with an upper air inlet communicated with the space at the top end of at least one of the spacing elements, and the lower air guide shell is buckled at the bottom ends of the plurality of battery cells and provided with a lower air inlet communicated with the space at the bottom end of at least one of the spacing elements.

Further, when the number of the spacers is odd, the thickness of the flow guide groove in one spacer in the middle is larger than the thickness of the flow guide grooves in the other spacers;

when the number of the spacers is even, the thicknesses of the diversion trenches in the two spacers positioned in the middle are consistent and are greater than the thicknesses of the diversion trenches in the other spacers.

Furthermore, the plurality of convex strips comprise first convex strips and second convex strips positioned below the first convex strips, one side of each first convex strip, which is far away from the corresponding second convex strip, is provided with an upper flow guide cavity, and two ends of each upper flow guide cavity are respectively communicated with the outside and the flow guide assembly and form the upper flow guide channel with the flow guide assembly;

and/or one side of the second convex strip, which deviates from the first convex strip, is provided with a lower guide cavity, and two ends of the lower guide cavity are respectively communicated with the outside and the guide assembly and form the lower guide channel with the guide assembly.

Further, along the direction of gradually being close to first ventilation mechanism, the volume of guiding gutter between first sand grip and the second sand grip on each distance piece reduces gradually.

Further, the length directions of the first protruding strips and the second protruding strips are parallel to the top surface of each battery cell;

the height of the first convex strip on each of the distance pieces is gradually reduced and/or the height of the second convex strip on each of the distance pieces is gradually increased along the direction gradually approaching the first ventilation mechanism.

Furthermore, in two of the distance pieces on the edge, the connecting line of the same position of the two first convex strips extends along a first direction, the connecting line of the same position of the two second convex strips extends along a second direction, and an included angle between the first direction and/or the second direction and the arrangement direction of the distance pieces is 2-7 degrees.

Further, the one end that first sand grip is close to the water conservancy diversion subassembly is higher than the one end that deviates from the water conservancy diversion subassembly, and/or, the one end that the second sand grip is close to the water conservancy diversion subassembly is lower than the one end that deviates from the water conservancy diversion subassembly, each in the distance piece:

one end of the first convex strip close to the flow guide assembly is flush, and/or one end of the second convex strip close to the flow guide assembly is flush;

along being close to gradually first ventilation mechanism's direction, first sand grip deviates from the height of the one end of water conservancy diversion subassembly reduces gradually, and/or, the second sand grip deviates from the height of the one end of water conservancy diversion subassembly risees gradually.

Furthermore, the first convex strip becomes thick or thin gradually along the direction that is close to gradually the water conservancy diversion subassembly, and/or, the second convex strip becomes thick or thin gradually along the direction that is close to gradually the water conservancy diversion subassembly.

Furthermore, the plurality of convex strips further comprise a third convex strip positioned between the first convex strip and the second convex strip, and the third convex strip divides the space between the first convex strip and the second convex strip into two flow guide grooves which are arranged up and down.

Furthermore, the height of the third raised lines on each spacer is equal to that of the third raised lines on each spacer or the third raised lines on each spacer are distributed in a staggered manner.

Further, the water conservancy diversion subassembly is including roof, first guide plate, second guide plate and the bottom plate that from top to bottom sets gradually, the roof with space between the first guide plate with go up water conservancy diversion chamber intercommunication, first guide plate with space between the second guide plate with the guiding gutter intercommunication, the second guide plate with space between the bottom plate with water conservancy diversion chamber intercommunication down.

Further, the distance between the first baffle and the second baffle decreases gradually or in stages in a direction approaching the first ventilation mechanism.

In the battery module provided by the invention, the ventilation device comprises a first ventilation mechanism and a second ventilation mechanism, or the ventilation device comprises a first ventilation mechanism and a third ventilation mechanism, or the ventilation device comprises a first ventilation mechanism, a second ventilation mechanism and a third ventilation mechanism, each ventilation mechanism can perform air draft and can also perform air supply, and the following specific description is given by taking the ventilation device comprising three air draft ventilation mechanisms as an example:

when the battery module is used, the first ventilation mechanism positioned on one side of the flow guide assembly draws air relatively to the second ventilation mechanism and the third ventilation mechanism positioned on the other side of the flow guide assembly, air enters the middle flow guide channel, the upper flow guide channel and the lower flow guide channel from the outside of the battery module respectively, and is led out of the outside of the battery module by the first ventilation mechanism, the second ventilation mechanism and the third ventilation mechanism correspondingly and respectively, so that three heat dissipation air flows led out from two sides of the battery module are formed among the first battery module, the second battery module and the flow guide assembly.

Compared with the prior art, the battery module provided by the invention has the advantages that the minimum distance difference between the electric cores at different positions in the first battery module and the second battery module and the ventilation device is smaller, the temperature uniformity between the electric cores at different positions is improved, the temperature difference between the different electric cores is reduced, the middle part of the battery module is radiated more pertinently, and the upper part and/or the lower part of the battery module is radiated, so that the more uniform radiation of a single electric core can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic three-dimensional structure diagram of a partial structure of a battery module according to an embodiment of the present invention;

fig. 2 is a front view of a battery module according to an embodiment of the present invention;

fig. 3 is a bottom view of a battery module according to an embodiment of the present invention;

fig. 4 is a partial structural front view of a first battery module according to an embodiment of the present invention;

fig. 5 is a partial structural front view of a second battery module according to an embodiment of the present invention;

fig. 6 is a schematic three-dimensional structure diagram of a spacer according to a second embodiment of the present invention;

fig. 7 is a schematic three-dimensional structure diagram of a spacer according to a third embodiment of the present invention;

fig. 8 is a schematic three-dimensional structure diagram of a spacer according to a fourth embodiment of the present invention;

fig. 9 is a partial structural front view of a third battery module according to an embodiment of the present invention;

fig. 10 is a schematic three-dimensional structure diagram of a middle flow guide channel according to an embodiment of the present invention.

Icon: 1-a first battery module; 11-electric core; 12-a spacer; 121-a first rib; 122-second ribs; 123-third raised lines; 13-upper wind guiding shell; 131-an upper air inlet; 14-a lower wind guide shell; 141-lower air inlet; 2-a second battery module; 3-a flow guide assembly; 31-a top plate; 32-a first baffle; 33-a second baffle; 34-a bottom plate; 4-a first ventilation mechanism; 5-a second ventilation mechanism; 6-a third ventilation mechanism; 7-a middle flow guide channel; 71-a diversion trench; 8-upper flow guide channel; 81-upper diversion cavity; 9-lower flow guide channel; 91-lower diversion cavity.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The following describes in detail embodiments of the present invention with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

The present embodiment provides a battery module, as shown in fig. 1 to fig. 3, including a first battery module 1, a second battery module 2, and a ventilation device, wherein a flow guide assembly 3 is installed between the first battery module 1 and the second battery module 2, and the ventilation device includes a first ventilation mechanism 4 located at one side of the flow guide assembly 3, and a second ventilation mechanism 5 and/or a third ventilation mechanism 6 located at the other side of the flow guide assembly 3; a middle diversion channel 7 communicated with the first ventilation mechanism 4 is formed among the first battery module 1, the second battery module 2 and the diversion assembly 3, and an upper diversion channel 8 communicated with the second ventilation mechanism 5 and/or a lower diversion channel 9 communicated with the third ventilation mechanism 6 are also formed.

It can be understood that when the ventilation device includes the first ventilation mechanism 4 and the second ventilation mechanism 5, the middle guide channel 7 and the upper guide channel 8 are correspondingly formed between the first battery module 1, the second battery module 2 and the guide assembly 3; when the ventilation device comprises the first ventilation mechanism 4 and the third ventilation mechanism 6, a middle diversion channel 7 and a lower diversion channel 9 are correspondingly formed among the first battery module 1, the second battery module 2 and the diversion assembly 3; when the ventilation device comprises the first ventilation mechanism 4, the second ventilation mechanism 5 and the third ventilation mechanism 6, a middle flow guide channel 7, an upper flow guide channel 8 and a lower flow guide channel 9 are correspondingly formed among the first battery module 1, the second battery module 2 and the flow guide assembly 3. The ventilation mechanisms can pump out air in the corresponding flow guide channels and can also supply air to the corresponding flow guide channels.

Use convulsions as an example, because first ventilation mechanism 4 arranges in one side of water conservancy diversion subassembly 3, second ventilation mechanism 5 and/or third ventilation mechanism 6 arrange in the opposite side of water conservancy diversion subassembly 3, three ventilation mechanism or two relative convulsions of ventilation mechanism to can let the numerical value distribution of interval between the electric core 11 of different positions and the ventilation mechanism relatively even, compare with the scheme that sets up a ventilation mechanism now, improved the homogeneity of temperature between different positions electric core 11, reduced the temperature difference between different electric core 11.

In order to enable each electric core 11 in the first battery module 1 and the second battery module 2 to dissipate heat more uniformly, in at least one embodiment, the ventilation device includes a first ventilation mechanism 4, a second ventilation mechanism 5, and a third ventilation mechanism 6, and air in the middle diversion channel 7, the upper diversion channel 8, and the lower diversion channel 9 is respectively drawn out, so that heat is dissipated from the upper portion, the middle portion, and the lower portion of each electric core 11, the heat dissipation effect of the electric core 11 is enhanced, and more uniform heat dissipation of a single electric core 11 can be achieved.

The following embodiments are described by taking as an example a ventilation device including the first ventilation mechanism 4, the second ventilation mechanism 5, and the third ventilation mechanism 6.

The first ventilation mechanism 4, the second ventilation mechanism 5 and the third ventilation mechanism 6 may be fans, small-sized air pumps, small-sized blowers, or the like.

In at least one embodiment, the first ventilation mechanism 4, the second ventilation mechanism 5, and the third ventilation mechanism 6 are fans.

Since the first battery module 1 and the second battery module 2 are disposed opposite to each other, the structures of the first battery module 1 and the second battery module 2 are preferably mirror-symmetrical, and the following embodiment will specifically describe the structures of the first battery module 1 and the second battery module 2 by taking the first battery module 1 as an example:

in some embodiments, each of the first battery module 1 and the second battery module 2 includes a plurality of battery cells 11 arranged in sequence, a spacer 12 is interposed between two adjacent battery cells 11, and a plurality of protruding strips are protruding from two sides of the spacer 12 facing the battery cells 11, as shown in fig. 4, a diversion trench 71 is formed between two adjacent protruding strips, that is, diversion trenches 71 are formed on two sides of the spacer 12, and a middle diversion channel 7 may be formed between the diversion trench 71 and the diversion assembly 3.

Specifically, one end of the diversion trench 71 is communicated with the outside, and the other end is communicated with the diversion assembly 3, so that outside air can enter the diversion assembly 3 through the diversion trench 71 and then enter the first ventilation mechanism 4 from the diversion assembly 3, and heat dissipation of the middle part of the electric core 11 is realized.

In addition, the space at the top end of the spacing piece 12 and the flow guide assembly 3 form an upper flow guide channel 8, the space at the bottom end of the spacing piece 12 and the flow guide assembly 3 form a lower flow guide channel 9, and outside air can enter the upper flow guide channel 8 and the lower flow guide channel 9 from the spaces at the top end and the bottom end of the spacing piece 12 respectively, so that the heat dissipation of the top and the bottom of the battery cell 11 is realized, and the uniformity of the heat dissipation of each battery cell 11 is ensured.

On the basis of the above embodiments, in order to enable the external air to rapidly enter the spaces at the top end and the bottom end of the spacer 12, in some embodiments, as shown in fig. 4, each of the first battery module 1 and the second battery module 2 further includes an upper air guiding shell 13 and a lower air guiding shell 14, the upper air guiding shell 13 is fastened to the top ends of the plurality of battery cells 11 and is provided with an upper air inlet 131 communicated with the space at the top end of the at least one spacer 12, and the lower air guiding shell 14 is fastened to the bottom ends of the plurality of battery cells 11 and is provided with a lower air inlet 141 communicated with the space at the bottom end of the at least one spacer 12.

The upper air guiding shell 13 may be a square shell, and the shell has only five other side surfaces except the bottom surface, so that the space surrounded by the upper air guiding shell 13 can be communicated with the space at the top end of the spacer 12, and similarly, the lower air guiding shell 14 may be a square shell, and the shell has only five other side surfaces except the top surface.

The upper air inlet 131 and the lower air inlet 141 may be configured as one, or two, three, or more, and the upper air inlet 131 and the lower air inlet 141 may be respectively located on the side surface or the top surface of the upper air guiding shell 13 and the lower air guiding shell 14.

In at least one embodiment, an upper air inlet 131 is correspondingly formed on a side surface of the upper air guiding shell 13 above each spacer 12, and a lower air inlet 141 is correspondingly formed on a side surface of the lower air guiding shell 14 below each spacer 12, so that the external air can rapidly enter spaces at the top end and the bottom end of each spacer 12.

In each battery module, the thicknesses of the channels 71 in the respective spacers 12 may be all the same, may be partially the same, or may be all different.

Specifically, when the number of spacers 12 is an odd number, for example, 3, 5, or 7, the thickness of channel 71 in one spacer 12 located in the middle is greater than the thickness of channels 71 in the other spacers 12, for example, as shown in fig. 5, and when the number of spacers 12 is 7, the thickness of channel 71 in the 4 th spacer 12 from the left to the right is greater than the thickness of channel 71 in the other spacers 12.

Similarly, when the number of spacers 12 is an even number, such as 2, 4 or 6, the thickness of channels 71 in two spacers 12 located in the middle is uniform and greater than the thickness of the other spacers 12. It is understood that when the number of the spacers 12 is 2, both the spacers 12 can be regarded as being positioned at the middle, and the thickness of the channels 71 is the same in both the spacers 12.

Because the distance between the central electric core 11 and the three ventilation mechanisms is relatively far, and the wind speed is relatively small, the wind inlet area of the side surface can be increased by increasing the thickness of the diversion trench 71 between the central electric cores 11, so that the temperature uniformity of each electric core 11 can be further improved, and the heat dissipation effect can be improved.

The thickness of the guide grooves 71 in the "other spacers 12" may be all the same, or the thickness of the guide grooves 71 in the spacers 12 closer to both sides may be smaller in the direction closer to both sides with the center of the intermediate spacer 12 as the center.

The spacer 12 may be provided with two, three, four, or the like convex strips.

In some embodiments, as shown in fig. 4, the plurality of protruding strips on the spacer 12 includes a first protruding strip 121 and a second protruding strip 122 located below the first protruding strip 121, a side of the first protruding strip 121 facing away from the second protruding strip 122 has an upper guiding cavity 81, the upper guiding cavity 81 is respectively communicated with the outside and the guiding assembly 3 and forms an upper guiding channel 8 with the guiding assembly 3, so when the first battery module 1 includes the upper guiding housing 13, the upper air inlet 131 is communicated with the upper guiding cavity 81, and the outside air can simultaneously enter the upper guiding cavity 81 from the side opening formed between the top end of the spacer 12 and two adjacent battery cells 11 and the upper air inlet 131, then enter the guiding assembly 3, and is discharged back to the outside through the second ventilation mechanism 5, thereby dissipating heat from the upper surfaces of the battery cells and the lines on the battery cells.

As shown in fig. 4, one side of the second protruding strip 122 away from the first protruding strip 121 has a lower guiding cavity 91, the lower guiding cavity 91 is respectively communicated with the outside and the guiding assembly 3 and forms a lower guiding channel 9 with the guiding assembly 3, therefore, when the first battery module 1 includes the lower guiding shell 14, the lower air inlet 141 is communicated with the lower guiding cavity 91, the outside air can simultaneously enter the lower guiding cavity 91 from the side opening formed between the bottom end of the spacer 12 and two adjacent battery cells 11 and the lower air inlet 141, and then enter the guiding assembly 3, and is discharged back to the outside through the third ventilation mechanism 6, so as to dissipate heat from the lower part of the battery cells and the lower surface.

The following four embodiments can be divided according to the position and/or shape of the first protruding strip 121 and the second protruding strip 122 on each spacer 12:

the first embodiment is as follows:

in the first embodiment, the positions and shapes of the first protruding strips 121 and the second protruding strips 122 on each of the spacers 12 are the same, that is, the structures of the spacers 12 are the same, which facilitates the manufacturing of the spacers 12 and does not require different types of molds.

Example two:

in the second embodiment, the volume of the guide groove 71 between the first protrusion 121 and the second protrusion 122 on each spacer 12 gradually decreases in the direction gradually approaching the first ventilation mechanism 4.

The above arrangement can minimize the air inlet area of the spacer 12 closest to the first ventilation mechanism 4 for dissipating heat from the flow guide groove 71 to the battery cell 11, and increase the air inlet area farther from the first ventilation mechanism 4. Since the closer to the first ventilation mechanism 4, the higher the wind speed, the different distances between the battery cells 11 and the first ventilation mechanism 4 in the prior art cause temperature differences between the battery cells 11 at different positions. In the second embodiment, the air inlet area close to the first ventilation mechanism 4 is reduced, and the air inlet area far away from the first ventilation mechanism 4 is increased, so that the air volume entering the middle part of the side surfaces of different battery cells is relatively consistent, and the temperature difference between the different battery cells 11 is further reduced.

The second embodiment has a further advantage that, by the design of the above structure, in addition to the fact that the air inlet area of the spacer 12 near the first ventilation mechanism 4 is decreased and the air inlet area of the spacer 12 far away from the first ventilation mechanism 4 is increased relative to the first ventilation mechanism 4, from the angle of distance relative to the second ventilation mechanism 5, the air inlet area of the upper diversion cavity 81 at the battery cell 11 far away from the second ventilation mechanism 5 is increased and the air inlet area of the upper diversion cavity 81 at the battery cell 11 near the second ventilation mechanism 5 is decreased, so that the air volumes entering the upper portions of the side surfaces of different battery cells are relatively consistent, and the temperature difference between the top portions of different battery cells 11 is further decreased.

In a similar way, the air quantity entering the lower parts of the side surfaces of different cells is relatively consistent, and the temperature difference of the bottoms of different cells 11 is further reduced.

This embodiment two can effectively reduce the difference in temperature between each electric core 11, through the structure that changes separation piece 12 self, can change the area of intaking of middle part water conservancy diversion passageway 7, upper portion water conservancy diversion passageway 8 and lower part water conservancy diversion passageway 9 simultaneously, not only makes the temperature at each electric core 11 middle part tend to unanimous, still makes the temperature of each electric core 11 top and bottom tend to unanimous, extension battery module life.

In the second embodiment, as shown in fig. 4 and 6, the longitudinal directions of the first protruding strips 121 and the second protruding strips 122 may be parallel to the top surface of each cell 11. In the direction gradually approaching first ventilation mechanism 4, the height of first rib 121 on each of spacers 12 gradually decreases, and the height of second rib 122 on each of spacers 12 gradually increases, so that the volume of guide groove 71 on spacer 12 gradually decreases in the above-described direction.

Specifically, starting from the spacer 12 closest to the first ventilation mechanism 4, there is a certain distance between the first protruding strip 121 and the top surface of the battery cell 11, and the distance between the first protruding strip 121 on the spacer 12 next to the first ventilation mechanism 4 and the top surface of the battery cell 11 is next to the first protruding strip, and so on, and the distance of the difference in each time may be equal, may also be increased, decreased, and so on.

In the second embodiment, preferably, in the two spacers 12 located at the edges, a connection line of the same position of the two first protruding strips 121 extends along the first direction, and an included angle between the first direction and the arrangement direction of the spacers 12 is 2 to 7 °, that is, an included angle between a dotted line and the top surface of the battery cell 11 in fig. 4 is 2 to 7 °, specifically, 2 °, 4 °, 6 °, 7 °, or the like may be selected.

The above-mentioned angle limitation can avoid that the volumes of the guide grooves 71 in the spacer 12 close to the first ventilation mechanism 4 are too small, and can also avoid that the volumes of the guide grooves 71 in the spacers 12 on both sides are not too different to affect the temperature consistency among the battery cells 11.

A line connecting the same positions of the two second protruding strips 122 extends along the second direction, and an angle between the second direction and the arrangement direction of the spacers 12 may also be 2 to 7 °, specifically 2 °, 4 °, 6 °, 7 °, or the like.

Of course, the above-described range of included angles may be satisfied in at least one of the first direction and the second direction.

Example three:

in the third embodiment, the volume of the guide groove 71 between the first protrusion 121 and the second protrusion 122 on each spacer 12 is still gradually reduced in the direction gradually approaching the first ventilation mechanism 4. The third embodiment is different from the second embodiment in that: as shown in fig. 7, one end of the first protruding strip 121 close to the diversion assembly 3 is higher than one end of the second protruding strip 122 close to the diversion assembly 3, and one end of the second protruding strip 122 close to the diversion assembly 3 is lower than one end of the second protruding strip 122 away from the diversion assembly 3, and a flared diversion trench 71 is formed between the first protruding strip 121 and the second protruding strip 122.

In each spacer 12 of the third embodiment:

the one end parallel and level that first sand grip 121 is close to guide assembly 3, the one end parallel and level that second sand grip 122 is close to guide assembly 3 so can make from the air that goes up guide chamber 81 or guide chamber 91 entering down can be easier up wind guide shell 13 and guide shell 14 down and wind, have improved the radiating effect. And because each sand grip is close to the one end parallel and level of water conservancy diversion subassembly 3, consequently, the roof and the diapire of water conservancy diversion subassembly 3 can all be the horizontally.

Preferably, one end of the first protruding strip 121 close to the flow guide assembly 3 is flush with the top surface of the battery cell 11, and one end of the second protruding strip 122 close to the flow guide assembly 3 is flush with the bottom surface of the battery cell 11.

In order to gradually decrease the volume of the guide grooves 71 of each spacer 12 in the direction approaching the first ventilation means 4, the height of the end of the first rib 121 facing away from the deflector assembly 3 gradually decreases and the height of the end of the second rib 122 facing away from the deflector assembly 3 gradually increases in the above direction.

In the third embodiment, as shown in fig. 7, the first convex strips 121 have the same thickness along the longitudinal direction thereof, and the second convex strips 122 have the same thickness along the longitudinal direction thereof.

Example four:

the fourth embodiment is different from the third embodiment in that: as shown in fig. 8, the left rear side of the spacer 12 is the installation position of the air guide member 3, the first protrusion 121 is tapered or may be thickened in a direction gradually approaching the air guide member 3, and the second protrusion 122 is tapered or may be thickened in a direction gradually approaching the air guide member 3.

Compared with the embodiment, the above arrangement has the advantages that the contact area between the first protruding strip 121 and the second protruding strip 122 and the side surface of the battery cell 11 can be smaller, so that the contact area between air and the side surface of the battery cell 11 is increased, the heat dissipation effect is further improved, the material consumption of the spacer 12 can be reduced, and the production cost is reduced.

In addition to the above four embodiments, as shown in fig. 6 to 8, in some embodiments, the plurality of convex strips further includes a third convex strip 123 located between the first convex strip 121 and the second convex strip 122, and the third convex strip 123 divides a space between the first convex strip 121 and the second convex strip 122 into two flow guide grooves 71 disposed vertically, so that the structure of the spacer 12 can be more firmly and stably clamped between the two battery cells 11.

Specifically, the third protrusions 123 on each of the spacers 12 may be equally distributed, or the third protrusions 123 on each of the spacers 12 may be staggered as shown in fig. 9.

The staggered distribution may be that the heights of some of the spacers 12 are not uniform, or that the heights of all of the spacers 12 are not uniform, so as to reduce the contact with the side surface of the battery cell 11 at the same position, and further improve the heat dissipation effect of the battery cell 11.

In at least one embodiment, the heights of the third protruding strips 123 on two sides of each cell 11 are different.

The structure of the guide assembly 3 is explained in detail below:

in some embodiments, as shown in fig. 10, the flow guiding assembly 3 includes a top plate 31, a first flow guiding plate 32, a second flow guiding plate 33 and a bottom plate 34, which are sequentially arranged from top to bottom, a space between the top plate 31 and the first flow guiding plate 32 is communicated with the upper flow guiding cavity 81 to form an upper flow guiding channel 8, a space between the first flow guiding plate 32 and the second flow guiding plate 33 is communicated with the flow guiding groove 71 to form a middle flow guiding channel 7, and a space between the second flow guiding plate 33 and the bottom plate 34 is communicated with the lower flow guiding cavity 91 to form a lower flow guiding channel 9.

As shown in fig. 10, the external air enters the upper flow guiding cavity 81 through the upper air inlet 131 and the side opening formed between the top end of the spacer 12 and the two adjacent battery cells 11, absorbs the heat at the top of the battery cells 11, enters the space between the top plate 31 and the first flow guiding plate 32 through the upper flow guiding cavity 81, and is finally pumped out to the outside by the second air blowing mechanism 5; the outside air absorbs heat from the side of the battery cell 11 by flowing through the flow guide groove 71, then enters the space between the first flow guide plate 32 and the second flow guide plate 33, and is finally extracted to the outside by the first ventilation mechanism 4; the outside air enters the lower diversion cavity 91 through the lower air inlet 141 and the side opening formed between the bottom end of the spacer 12 and the two adjacent battery cells 11, absorbs the heat at the bottom of the battery cells 11, enters the space between the second diversion plate 33 and the bottom plate 34 through the lower diversion cavity 91, and is finally pumped out to the outside by the third ventilation mechanism 6.

Specifically, as shown in fig. 10, the middle diversion channel 7 may be closed at the right end, the left end of which is communicated with the first ventilation mechanism 4 through the battery module housing, the upper diversion channel 8 and the lower diversion channel 9 may be closed at the left end, and the right end of which is communicated with the second ventilation mechanism 5 and the third ventilation mechanism 6 through the battery module housing, respectively.

In some embodiments, the distance between the first air guiding plate 32 and the second air guiding plate 33 may gradually decrease in the direction approaching the first ventilation mechanism 4, that is, the first air guiding plate 32 and the second air guiding plate 33 are obliquely arranged plates.

It is of course also possible, as shown in fig. 10, to reduce the distance between the first air guiding plate 32 and the second air guiding plate 33 in stages along the direction approaching the first ventilation mechanism 4, i.e. the first air guiding plate 32 and the second air guiding plate 33 are stepped plates.

Above-mentioned setting is convenient for lead the first ventilation mechanism 4 with the wind in the middle part water conservancy diversion passageway 7, finally derives the battery module, has improved the radiating effect.

Of course, the first flow guide plate 32 and the second flow guide plate 33 may also be in other shapes, that is, any shape that can facilitate guiding the wind in the middle flow guide channel 7 to the first ventilation mechanism 4 may be used.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A battery module comprises a first battery module (1), a second battery module (2) and a ventilation device, and is characterized in that a flow guide assembly (3) is installed between the first battery module (1) and the second battery module (2), and the ventilation device comprises a first ventilation mechanism (4) positioned on one side of the flow guide assembly (3), and a second ventilation mechanism (5) and a third ventilation mechanism (6) positioned on the other side of the flow guide assembly (3);

a middle flow guide channel (7) communicated with the first ventilation mechanism (4) is formed among the first battery module (1), the second battery module (2) and the flow guide assembly (3), an upper flow guide channel (8) communicated with the second ventilation mechanism (5) and a lower flow guide channel (9) communicated with the third ventilation mechanism (6) are also formed;

the first battery module (1) and the second battery module (2) respectively comprise a plurality of sequentially arranged battery cores (11), and a spacer (12) is clamped between every two adjacent battery cores (11);

a plurality of convex strips are convexly arranged on two sides of the spacer (12) facing the battery core (11), a flow guide groove (71) is formed between every two adjacent convex strips, and the flow guide groove (71) and the flow guide assembly (3) form the middle flow guide channel (7);

the space at the top end of the spacer (12) and the flow guide assembly (3) form the upper flow guide channel (8), and the space at the bottom end of the spacer (12) and the flow guide assembly (3) form the lower flow guide channel (9);

the plurality of convex strips comprise first convex strips (121) and second convex strips (122) positioned below the first convex strips (121), one side, away from the second convex strips (122), of each first convex strip (121) is provided with an upper flow guide cavity (81), and two ends of each upper flow guide cavity (81) are respectively communicated with the outside and the flow guide assembly (3) and form the upper flow guide channel (8) with the flow guide assembly (3);

one side of the second raised line (122) departing from the first raised line (121) is provided with a lower flow guide cavity (91), and two ends of the lower flow guide cavity (91) are respectively communicated with the outside and the flow guide assembly (3) and form the lower flow guide channel (9) with the flow guide assembly (3);

diversion subassembly (3) including roof (31), first guide plate (32), second guide plate (33) and bottom plate (34) that from top to bottom set gradually, roof (31) with space between first guide plate (32) with go up water conservancy diversion chamber (81) intercommunication, first guide plate (32) with space between second guide plate (33) with guiding gutter (71) intercommunication, second guide plate (33) with space between bottom plate (34) with lower water conservancy diversion chamber (91) intercommunication.

2. The battery module according to claim 1, wherein the first battery module (1) and the second battery module (2) further include an upper air guide shell (13) and/or a lower air guide shell (14), the upper air guide shell (13) is fastened to the top ends of the plurality of battery cells (11) and provided with an upper air inlet (131) communicated with the space at the top end of the at least one spacer (12), and the lower air guide shell (14) is fastened to the bottom ends of the plurality of battery cells (11) and provided with a lower air inlet (141) communicated with the space at the bottom end of the at least one spacer (12).

3. The battery module according to claim 1, wherein when the number of the spacers (12) is an odd number, the thickness of the flow guide groove (71) in one of the spacers (12) located in the middle is greater than the thickness of the flow guide groove (71) in the other spacers (12);

when the number of the spacers (12) is even, the thickness of the diversion trench (71) in the two spacers (12) in the middle part is consistent and is larger than that of the diversion trench (71) in the other spacers (12).

4. The battery module according to claim 1, wherein a volume of a flow guide groove (71) between the first rib (121) and the second rib (122) on each of the spacers (12) is gradually reduced in a direction gradually approaching the first ventilation mechanism (4).

5. The battery module according to claim 4, wherein the first rib (121) and the second rib (122) have length directions parallel to the top surface of each cell (11);

the height of the first rib (121) on each spacer (12) gradually decreases and/or the height of the second rib (122) on each spacer (12) gradually increases in a direction gradually approaching the first ventilation means (4).

6. The battery module according to claim 5, wherein, of the two spacers (12) located at the edges, a line connecting the same positions of the two first ribs (121) extends in a first direction, and a line connecting the same positions of the two second ribs (122) extends in a second direction, and an angle between the first direction and/or the second direction and the arrangement direction of the spacers (12) is 2 to 7 °.

7. The battery module according to claim 4, wherein the end of the first rib (121) close to the flow guide member (3) is higher than the end facing away from the flow guide member (3), and/or the end of the second rib (122) close to the flow guide member (3) is lower than the end facing away from the flow guide member (3), and in each of the spacers (12):

one end, close to the flow guide assembly (3), of the first convex strip (121) is flush, and/or one end, close to the flow guide assembly (3), of the second convex strip (122) is flush;

along the direction of being close to gradually first ventilation mechanism (4), first sand grip (121) deviate from the height of the one end of water conservancy diversion subassembly (3) reduces gradually, and/or, second sand grip (122) deviate from the height of the one end of water conservancy diversion subassembly (3) risees gradually.

8. The battery module according to claim 7, wherein the first rib (121) is gradually thickened or tapered in a direction gradually approaching the flow guide member (3), and/or the second rib (122) is gradually thickened or tapered in a direction gradually approaching the flow guide member (3).

9. The battery module according to claim 1, wherein the plurality of ribs further includes a third rib (123) located between the first rib (121) and the second rib (122), and the third rib (123) divides a space between the first rib (121) and the second rib (122) into two flow guide grooves (71) arranged up and down.

10. The battery module according to claim 9, wherein the third ribs (123) on each of the spacers (12) are equal in height or the third ribs (123) on each of the spacers (12) are staggered.

11. The battery module according to claim 1, wherein the distance between the first and second flow guide plates (32, 33) is gradually reduced or stepwise reduced in a direction gradually approaching the first ventilation mechanism (4).