CN218070075U

CN218070075U - Battery module

Info

Publication number: CN218070075U
Application number: CN202222294772.3U
Authority: CN
Inventors: 钟德良; 吴长风
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-08-30
Filing date: 2022-08-30
Publication date: 2022-12-16
Anticipated expiration: 2032-08-30

Abstract

The utility model discloses a battery module, include: the battery comprises a plurality of battery cells, a plurality of battery cells and a plurality of battery cells, wherein the battery cells are sequentially arranged along a first direction; the gasket is elastic and arranged between the battery cells so that the distance between the two battery cells on two sides of the gasket is changed due to the elastic deformation of the gasket, and a heat dissipation air duct is formed between the gasket and the battery cells. The battery core is subjected to expansion force and released through compression deformation of the bulge which is abutted against the gasket, and pressure is absorbed on the gasket and can be released through further compression deformation of the body; the strengthening rib of body can be regarded as to the bellying, can play the additional strengthening to the structure of gasket, and the gasket can absorb the bulging force that produces when electric core circulation charge-discharge, is favorable to reducing the bulging force in electric core circulation later stage, is favorable to promoting electric core life cycle.

Description

Battery module

Technical Field

The utility model relates to a battery technology field, concretely relates to battery module.

Background

With the continuous development of power battery technology, the safety of the battery is more and more valued. Thermal runaway is the most serious safety accident of a power battery, when the thermal runaway occurs in a battery core of the battery, the heat generation quantity of the battery is increased suddenly, and the heat is transferred to surrounding batteries, so that the large-scale thermal runaway of the surrounding batteries is rapidly caused, the batteries are ignited and even exploded, and the life safety of users is directly threatened. Therefore, it is necessary to add a thermal protection structure between the cells.

However, when the battery core is heated to expand, the thermal protection structure in the existing structure is easily squeezed by the battery core, and then the blue film on the battery core is damaged, so that the risk of failure of the battery structure is increased.

SUMMERY OF THE UTILITY MODEL

In view of the above-described drawbacks or deficiencies in the prior art, it would be desirable to provide a battery module that can improve battery thermal insulation while reducing battery swelling force.

In a first aspect, the present application provides a battery module, including:

the battery comprises a plurality of battery cells, a plurality of battery cells and a plurality of battery cells, wherein the battery cells are sequentially arranged along a first direction;

the gasket is elastic and arranged between the battery cells so that the distance between the two battery cells on two sides of the gasket is changed due to the elastic deformation of the gasket, and a heat dissipation air duct is formed between the gasket and the battery cells.

The gasket arranged between the two adjacent electric cores can realize physical isolation of heat transfer between the two adjacent electric cores, the electric cores are released through compression deformation of the elastic gasket when being heated and expanded, and pressure is absorbed on the gasket, so that the heat insulation effect of the battery can be improved, and the expansion force of the battery can be reduced; in addition, the heat dissipation air duct formed between the gasket and the battery core can dissipate the heat of the battery through the heat dissipation air duct and lead the heat to be led out of the battery module, so that the heat dissipation effect is improved, and the service life of the battery core is prolonged.

Optionally, one side of the gasket along the first direction is formed with a protrusion portion contacting the battery cell. The bulge part is arranged on one side of the gasket, so that heat can be effectively insulated; the expansion force of the battery core is released through the compression deformation of the protruding part which is pressed against the gasket, and the pressure is absorbed on the gasket; through the heat dissipation wind channel that forms between bellying and the electric core, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel, can improve the thermal-insulated radiating effect of battery and reduce the battery bulging force simultaneously.

Or, the two sides of the gasket along the first direction are respectively provided with a protruding part for the cell contact. The battery cell is subjected to expansion force and is released through compression deformation of the bulge parts abutted against the gasket, and pressure is absorbed on the gasket; through the heat dissipation wind channel that forms between bellying and the electric core, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel, can improve the thermal-insulated radiating effect of battery and reduce the battery bulging force simultaneously.

Optionally, the gasket includes a body portion and a protruding portion formed on both side surfaces in a thickness direction of the body portion; the convex parts are symmetrically distributed or staggered on the two side surfaces relative to the plane of the body. By adjusting the arrangement mode of the convex parts, the heat insulation effect, the heat dissipation effect and the expansion force absorption effect of the gasket can be adjusted.

Optionally, the body is integrally formed with the boss. The body and the bulge are integrally formed, so that the preparation method is simplified.

Optionally, the protrusions extend along the width direction of the battery cell, and the protrusions are distributed at intervals along the height direction of the battery cell. Through the mode of setting up of bellying, can adjust the direction in heat dissipation wind channel according to the arrangement of electric core, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel, can improve the thermal-insulated radiating effect of battery and reduce the battery bulging force simultaneously.

Optionally, an included angle is formed between the bottom edge of the protruding portion in the extending direction and the side edge of the body portion, and a heat dissipation air duct obliquely arranged is formed between the battery cell and the battery cell through the protruding portion, so that hot air can flow through the obliquely heat dissipation air duct, and the heat dissipation effect is improved.

Optionally, a groove is formed between two adjacent protrusions, and a plurality of heat dissipation holes are formed in the groove. The hot air on one side is led out through the heat dissipation air duct on the other side through the heat dissipation holes, so that the air flow rate can be increased, and the heat dissipation effect is improved.

Optionally, a cross-sectional shape of the protruding portion cut along a plane parallel to the height direction of the battery cell is an arc. The bulge through the arc structure can prevent that the bulge from contacting with the battery cell to damage the blue membrane of the battery cell when the battery cell is heated and expanded.

Optionally, in a plurality of grooves formed between every two adjacent protrusions along the height direction of the battery cell, the maximum distance between the groove widths at the middle position of the body is greater than the maximum distance between the groove widths at the two end positions of the body, or the maximum distance between the groove widths gradually increases from the two ends of the body to the middle of the body. By adjusting the width of the heat dissipation air duct, the heat dissipation speed of different positions of the battery cell can be adjusted, the middle position of the battery cell generates heat obviously, the width of the heat dissipation air duct at the middle position is improved, and the heat dissipation effect is improved; the radiating air duct at the edge position is reduced, and the damping suction effect of the gasket is improved.

Optionally, a heat insulation glue layer is coated on the surface of the protruding portion, and the protruding portion is fixedly connected with the battery cell through the heat insulation glue layer. Have good adiabatic ability through adiabatic glue film, prevent the heat exchange between the electric core, improve the thermal-insulated effect of gasket.

The embodiment of the utility model provides a technical scheme can include following beneficial effect:

in the battery module provided by the embodiment of the utility model, the battery core is subjected to the expansion force and is released through the compression deformation of the convex part which is abutted against the gasket, and the pressure is absorbed on the gasket and can be released through the further compression deformation of the body; the strengthening rib of body can be regarded as to the bellying, can play the additional strengthening to the structure of gasket, and the gasket can absorb the bulging force that produces when electric core circulation charge-discharge, is favorable to reducing the bulging force in electric core circulation later stage, is favorable to promoting electric core life cycle.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:

fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a battery module (excluding a battery cell in contact with a gasket) according to an embodiment of the present invention;

fig. 3-10 are schematic structural views of a gasket according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a battery box according to an embodiment of the present invention.

In the figure, the position of the first and second end faces,

1. a body portion; 2. a boss portion; 3. heat dissipation holes; 4. a first surface; 5. a second surface; 6. a groove; x, a first direction; y, a second direction; 7. an electric core; 8. a box body; 9. a heat radiation fan; 10. a heat dissipation air duct; 20. and (6) a gasket.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The battery module is a more commonly used energy storage structure, and the battery module in the conventional art mainly includes a plurality of electric cores 7, and each electric core 7 arranges in proper order, however, battery module during operation, if thermal runaway's problem appears in individual electric core 7, then the heat that produces on these electric cores 7 will transmit to other electric cores 7 fast on, then lead to other electric cores 7 to produce more heats.

Be provided with the passageway that is used for inflation or air to flow between general electric core 7 and electric core 7, the coefficient of heat conductivity of air is very little, can play better hindrance effect to the transmission of heat between electric core 7, but when electric core 7 took place the thermal runaway, the emergence ballooning that electric core 7 can be corresponding, adjacent electric core 7 can be contacted to the 7 shells of ballooning, then the great metal casing contact transmission of most heat through coefficient of heat conductivity, greatly increased the risk that heat stretchs.

Referring to fig. 1-2, the present application provides a battery module, including:

the battery cell structure comprises a plurality of battery cells 7, wherein the battery cells 7 are sequentially arranged along a first direction X;

the gasket 20 has elasticity, and is disposed between the battery cells so that an interval between two battery cells 7 on two sides of the gasket is changed due to elastic deformation of the gasket 20, as shown in fig. 3 to 4, at least one gasket 20 physically isolates two adjacent battery cells 7, and a heat dissipation air duct 10 is formed between the gasket 20 and the battery cells 7.

Physical isolation of heat transfer between two adjacent battery cells 7 can be realized by arranging the gasket 20 between the battery cells 7, the battery cells 7 are released through compression deformation of the elastic gasket 20 when being heated and expanded, and pressure is absorbed on the gasket 20, so that the heat insulation effect of the battery can be improved, and the expansion force of the battery is reduced; in addition, the heat dissipation air duct 10 is formed between the gasket 20 and the battery cell 7, and the heat of the battery can be dissipated through the heat dissipation air duct 10 and led out of the battery module, so that the heat dissipation effect is improved, and the service life of the battery cell 7 is prolonged.

It can be understood that one or more gaskets can be placed between the battery core and the battery core in the application, and the gaskets are used for achieving the effects of heat insulation, heat dissipation, shock absorption, suction and the like. In addition, the arrangement mode of the gaskets 20 on the battery module can be that the gaskets are arranged between every two battery cores, of course, other arrangement modes can also be adopted, and the number and the positions of the gaskets 20 can be adjusted according to actual conditions in specific application.

In one embodiment of the present application, one side of the gasket 20 along the first direction X is formed with a protrusion 2 contacting the battery cell 7, and the other side of the gasket 20 contacts the battery cell 7, as shown in fig. 5. The bulge part 2 is arranged on one side of the gasket 20, so that heat can be effectively insulated; the expansion force applied to the battery cell 7 is released through the compression deformation of the convex part 2 which is abutted against the gasket 20, and the pressure is absorbed on the gasket 20; through the heat dissipation wind channel 10 that forms between bellying 2 and electric core 7, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel 10, can improve the thermal-insulated radiating effect of battery and reduce the battery bulging force simultaneously.

In another embodiment of the present application, two sides of the gasket 20 along the first direction X are respectively formed with a protruding portion 2 contacted by the battery cell 7, as shown in fig. 6. The bulge parts 2 are arranged on the two sides of the gasket 20, the expansion force of the battery cell 7 is released through the compression deformation of the bulge parts 2 which are abutted against the gasket 20, and the pressure is absorbed on the gasket 20; through the heat dissipation wind channel 10 that forms between bellying 2 and electric core 7, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel 10, can improve the thermal-insulated radiating effect of battery and reduce the battery bulging force simultaneously.

In the present embodiment, the protrusions 2 are symmetrically distributed (as shown in fig. 6) or staggered (as shown in fig. 7) on the first surface 4 and the second surface 5 with respect to the plane of the body portion 1. In the present application, the protrusions 2 on the first surface 4 and the second surface 5 of the body portion 1 are in surface contact with different battery cells 7 respectively, so as to achieve the effect of absorbing the expansion force for different battery cells 7, and therefore, in different embodiments, the protrusions 2 on the first surface 4 and the second surface 5 may be adjusted as needed, which is not limited in the present application.

It should be noted that, the present application does not limit the arrangement of the protruding portions 2 on the first surface 4 and the second surface 5, and in the embodiment of the present application, the protruding portions 2 are distributed on the first surface 4 and the second surface 5 in a staggered manner with respect to the plane where the main body portion 1 is located, that is, the orthographic projection of the protruding portion 2 on the first surface 4 on the main body portion 1 and the orthographic projection of the protruding portion 2 on the second surface 5 on the main body portion 1 do not completely overlap, may partially overlap, and may also not completely overlap. It is understood that the heat insulating effect, the heat dissipating effect, the effect of absorbing the expansion force of the gasket 20 can be adjusted by adjusting the shape, structure, position, etc. of the protrusions 2 on the first surface 4 and the second surface 5.

In the present application, the body portion 1 and the boss portion 2 each have elasticity. Meanwhile, the gasket 20 is made of a material with good insulating and heat-insulating properties, and can be made of tough plastics such as PC + ABS. While insulating heat and absorbing expansion force, the battery cell 7 and the gasket 20 can be insulated, so that friction between the battery cell 7 and the boss 2 is avoided, and short circuit and the like are prevented. In addition, the bulge part 2 can also support the battery core 7, and vibration of the battery is effectively relieved.

In the application, the expansion force applied to the battery cell 7 is released through the compression deformation of the protruding part 2 which is abutted against the gasket 20, the pressure is absorbed on the gasket 20, and the further compression deformation of the body part 1 can be released; the reinforcing rib of noumenon portion 1 can be regarded as to bellying portion 2, can play the additional function to the structure of gasket 20, and gasket 20 can absorb the bulging force that produces when electric core 7 circulates the charge-discharge, is favorable to reducing the bulging force in electric core 7 circulation later stage, is favorable to promoting electric core 7 cycle life.

The main body 1 and the protrusion 2 are integrally formed, or the main body 1 and the protrusion 2 are fixedly connected. The arrangement of the protrusion and the body part 1 can be adjusted according to the material and preparation method of the gasket 20, which is beneficial to simplifying the preparation method.

In one embodiment of the present application, the protruding portions 2 extend along the width direction of the battery cells 7, and the protruding portions 2 are distributed at intervals along the height direction of the battery cells 7. The present application is not limited to the shape and structure of the protrusion 2, and for example, several protrusions 2 are arranged parallel to each other on the body portion 1 and extend along the first direction X. The first direction X in this application is the width direction of the electric core.

In another embodiment of the present application, as shown in fig. 8, a bottom edge of the protrusion 2 in the extending direction forms an angle with a side edge of the body portion 1. On corresponding to the battery module, promptly the extending direction of bellying 2 form the contained angle between first direction X or the second direction Y, be in through bellying 2 form the heat dissipation wind channel that the slant set up between electric core and the electric core, can be favorable to hot-blast from flowing through between the oblique heat dissipation wind channel, improve the radiating effect. In specific application, the included angle can be set according to requirements.

In other possible embodiments, the protrusions 2 may be distributed on the surface of the body portion 1 in a linear shape, a curved shape, a sectional shape, and the like. Through the mode of setting up of bellying, can adjust the direction in heat dissipation wind channel 10 according to the arrangement of electric core, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel 10, can improve the thermal-insulated radiating effect of battery and reduce the battery bulging force simultaneously.

It is understood that the cross-sectional shape of the protruding portion 2 is not limited in the embodiments of the present application, and the cross-sectional shape of the protruding portion 2 may be a polygonal shape such as a triangle, a quadrangle, a trapezoid, or other irregular shapes. The present application is preferably configured such that a cross-sectional shape of the protruding portion 2 cut along a plane parallel to the height direction of the battery cell 7 is an arc shape, that is, a cross-sectional shape in the second direction YY is an arc shape. The bulge 2 with the arc-shaped structure can prevent the blue film of the battery cell 7 from being damaged by the contact between the bulge 2 and the battery cell 7 when the battery cell 7 is heated and expanded.

In an exemplary embodiment, in order to improve the heat dissipation effect when the gasket 20 is in contact with the battery cell 7, a groove 6 is formed between two adjacent protruding portions 2, and when the protruding portions 2 are in surface contact with the battery cell 7, a gap exists between the body portion 1 at the position of the groove 6 and the surface of the battery cell 7, and a heat dissipation air duct 10 is formed to conduct heat between the battery cell 7 and the battery cell 7. A plurality of heat dissipation holes are formed in the groove. The heat dissipation holes 3 are distributed on the body part 1 corresponding to the grooves 6, the heat dissipation holes 3 penetrate through the body part 1, hot air on one side is led out through the grooves 6 on the other side, the air flow rate can be improved, and the heat dissipation effect is improved.

The heat dissipation holes 3 in the present application are circular, oval, square, polygonal, a shape composed of a curved line and a straight line, or other irregular shapes. Can select the louvre 3 of different shapes as required, adopt the louvre 3 of regular shape, can guarantee gasket 20's mechanical strength, compare other shapes, the mechanical strength of round hole is better.

Researches show that large-area bulging deformation of the thermal runaway battery core 7 is serious and is in arc deformation, the central position of the adjacent surfaces between the battery cores 7 bulges most seriously, the contact point between the adjacent battery cores 7 is the central position of the adjacent surfaces of the two battery cores 7, and a gap is still left between the edges of the adjacent surfaces, so that the space for thermal expansion of the battery cores 7 at the middle position needs to be larger.

In this embodiment, a plurality of arrangement modes of the protruding portions 2 are provided, and in a plurality of grooves 6 formed between two adjacent protruding portions 2 along the height direction of the battery cell 7, a maximum distance L between widths of the grooves 6 at a middle position of the body portion 1 is greater than a maximum distance L between widths of the grooves 6 at two end positions of the body portion 1, as shown in fig. 9, or the maximum distance L between widths of the grooves 6 gradually increases from two ends of the body portion 1 to the middle of the body portion 1, as shown in fig. 10. By adjusting the width of the heat dissipation air duct 10, the heat dissipation speed of different positions of the battery cell 7 can be adjusted, the middle position of the battery cell 7 generates heat obviously, the width of the heat dissipation air duct 10 at the middle position is increased, and the heat dissipation effect is improved; the heat dissipation air duct 10 at the edge position is reduced, and the damping suction effect of the gasket 20 is improved.

Alternatively, as shown in fig. 3 to 4, the groove 6 includes a central concave portion at a central position of the body portion 1 and an edge concave portion at an edge position of the body portion 1, and a cross-sectional width of the central concave portion cut in a plane parallel to the height direction of the battery cell 7 (i.e., the second direction YY) is larger than a cross-sectional width of the edge concave portion cut in a plane parallel to the height direction of the battery cell 7 (i.e., the second direction YY).

For example, every two convex portions 2 are taken as a group, each group of convex portions 2 forms a groove 6, the width of each group of grooves 6 is the same, the grooves 6 formed between two adjacent groups of convex portions 2 are interclass channels, and the interclass channels are gradually reduced from the middle to two sides. Through the arrangement mode of recess 6 for the heat-sinking capability that is located 7 middle parts of electric core department increases, and in addition, when 7 middle parts of electric core were heated, the expansion space of reserving for electric core 7 was also bigger. The number of the convex parts 2 at the edge of the battery core 7 is more, the density is higher, and the damping and suction capacity is enhanced.

In the present application, the surface of the boss 2 is coated with a layer of thermally insulating glue in order to improve the surface. It can be understood that, in this application embodiment, gasket 20 adopts adiabatic glue film and heat insulating material, has good adiabatic ability, prevents heat exchange between electric core 7, forms recess 6 between the bellying 2 simultaneously, and this does not conflict with adiabatic ability, and adiabatic ability is for reducing the heat exchange between electric core 7 and the electric core 7, and recess 6 can make the heat transfer of battery go out between electric core 7 and the electric core 7, prevents that untimely heat of discharging from leading to the battery performance to descend, and then influences battery life.

In the present application, when the number of the battery cells 7 is multiple, such as 8 or 12 or even more, gaskets 20 may be disposed between the battery cells 7 and the battery cells 7, for example, one gasket 20 is disposed every four battery cells 7. It will be appreciated that the number and location of the spacers 20 may be adjusted to suit the particular application.

Optionally, the gasket 20 is fixedly connected to the battery cell 7 through a heat insulation adhesive layer. The gasket 20 has the same length as the cell 7 and the same width as the cell 7. All can contact with laminating of electricity core 7 through gasket 20 to can realize better effects such as fixed, absorption bulging force, shock attenuation to electricity core 7.

In the present application, as shown in fig. 11, the battery module further includes a battery case 8, and the battery case 8 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery module. Specifically, the cabinet 8 may include an upper cover and a housing that snap together. The shapes of the upper cover and the case may be determined according to the shapes of the plurality of battery modules.

Be provided with radiator fan 9 on the battery box 8, be equipped with a plurality of vents on the battery box 8, increased the circulation of gas in the battery box 8, further strengthen the heat dissipation. The direction of the wind direction of the heat dissipation fan 9 is consistent with that of the groove 6, and in the heat dissipation process, the fan blades of the fan blow against the groove 6, so that the heat exchange rate of the groove 6 and air is increased, heated air is blown out of the area where the power battery is located, and the heat dissipation rate of the battery module is increased.

Referring to fig. 3-10 in detail, the present application provides a gasket 20, which is applied to a battery module, and includes a body portion 1 and a plurality of protrusions 2 disposed on at least one side of the body portion 1, where the protrusions 2 protrude from a surface of the body portion 1 to contact with a battery cell 7, and a heat dissipation duct 10 is formed between the body portion 1 and the battery cell 7.

In the application, the expansion force applied to the battery cell 7 is released through the compression deformation of the protruding part 2 which is abutted against the gasket 20, the pressure is absorbed on the gasket 20, and the further compression deformation of the body part 1 can be released; the reinforcing rib of this somatic part 1 can be regarded as to bellying 2, can play the additional strengthening to the structure of gasket 20, and gasket 20 can absorb the bulging force that produces when electric core 7 circulates the charge-discharge, is favorable to reducing the bulging force in electric core 7 circulation later stage, is favorable to promoting electric core 7 cycle life.

In one embodiment of the present application, one side of the gasket 20 along the first direction X is formed with a protrusion 2 contacting the battery cell 7, and the other side of the gasket 20 contacts the battery cell 7. The bulge part 2 is arranged on one side of the gasket 20, so that heat can be effectively insulated; the expansion force applied to the battery cell 7 is released through the compression deformation of the convex part 2 which is abutted against the gasket 20, and the pressure is absorbed on the gasket 20; through the heat dissipation wind channel 10 that forms between bellying 2 and electric core 7, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel 10, can improve the thermal-insulated radiating effect of battery and reduce the battery bulging force simultaneously.

In another embodiment of the present application, two sides of the gasket 20 along the first direction X are respectively formed with a protruding portion 2 contacted by the battery cell 7. The bulge parts 2 are arranged on the two sides of the gasket 20, the expansion force of the battery cell 7 is released through the compression deformation of the bulge parts 2 which are abutted against the gasket 20, and the pressure is absorbed on the gasket 20; through the heat dissipation wind channel 10 that forms between bellying 2 and electric core 7, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel 10, can improve the thermal-insulated radiating effect of battery and reduce the battery bulging force simultaneously.

In the present embodiment, the protrusions 2 are symmetrically or alternately arranged on the first surface 4 and the second surface 5 with respect to the plane of the body portion 1. In the present application, the protrusions 2 on the first surface 4 and the second surface 5 of the body portion 1 are in surface contact with different battery cells 7 respectively, so as to achieve the effect of absorbing the expansion force for different battery cells 7, and therefore, in different embodiments, the protrusions 2 on the first surface 4 and the second surface 5 may be adjusted as needed, which is not limited in the present application.

In the present application, the body portion 1 and the boss portion 2 each have elasticity. Meanwhile, the gasket 20 is made of a material with good insulating and heat-insulating properties, and can be made of a tough plastic such as PC + ABS. While insulating heat and absorbing expansion force, the battery cell 7 and the gasket 20 can be insulated, so that friction between the battery cell 7 and the boss 2 is avoided, and short circuit and the like are prevented. In addition, the bulge part 2 can also support the battery core 7, and vibration of the battery is effectively relieved.

The main body 1 and the protrusion 2 are integrally formed, or the main body 1 and the protrusion 2 are fixedly connected. The different arrangement modes of the protrusion and the body part 1 can be adjusted according to the material and the preparation mode of the gasket 20, which is beneficial to simplifying the preparation mode.

The protruding portions 2 extend along the width direction of the battery cell 7, and the protruding portions 2 are distributed at intervals along the height direction of the battery cell 7. The shape and structure of the projection 2 are not limited in the present application, and for example, several projections 2 are arranged parallel to each other on the body portion 1 and extend along the first direction X. The first direction X in this application is the width direction of the electric core. In other possible embodiments, the protrusions 2 may be distributed on the surface of the body portion 1 in a linear shape, a curved shape, a sectional shape, and the like. Through the mode that sets up of bellying, can adjust the direction of heat dissipation wind channel 10 according to the arrangement of electric core, the heat of battery can give off and make the heat derive the battery module outside through heat dissipation wind channel 10, can improve the thermal-insulated radiating effect of battery and reduce battery bulging force simultaneously.

It is understood that the cross-sectional shape of the protruding portion 2 is not limited in the embodiments of the present application, and the cross-sectional shape of the protruding portion 2 may be a polygonal shape such as a triangle, a quadrangle, a trapezoid, or other irregular shapes. The present application is preferably configured such that a cross-sectional shape of the protruding portion 2 cut along a plane parallel to the height direction of the battery cell 7 is an arc shape, that is, a cross-sectional shape in the second direction YY is an arc shape. The bulge 2 with the arc-shaped structure can prevent the bulge 2 from contacting with the battery cell 7 to damage the blue film of the battery cell 7 when the battery cell 7 is heated and expanded.

In an exemplary embodiment, in order to improve the heat dissipation effect when the gasket 20 is in contact with the battery cell 7, a groove 6 is formed between two adjacent protruding portions 2, and when the protruding portions 2 are in surface contact with the battery cell 7, a gap exists between the body portion 1 at the position of the groove 6 and the surface of the battery cell 7, and a heat dissipation air duct 10 is formed to conduct heat between the battery cell 7 and the battery cell 7. A plurality of heat dissipation holes are formed in the groove. The radiating holes 3 are distributed on the body part 1 corresponding to the grooves 6, the radiating holes 3 penetrate through the body part 1, hot air on one side is led out through the grooves 6 on the other side, the air flow rate can be improved, and the radiating effect is improved.

Research finds that the thermal runaway cell 7 has large-area severe bulging deformation and arc deformation, the central position of the adjacent surfaces between the cells 7 bulges most seriously, and the contact point between the adjacent cells 7 is the central position of the adjacent surfaces of the two cells 7, and a gap is still left at the edge of the adjacent surfaces, so that the space for thermal expansion of the cell 7 at the middle position needs to be larger.

In this embodiment, a plurality of arrangement modes of the protruding portions 2 are provided, and in a plurality of grooves 6 formed between two adjacent protruding portions 2 along the height direction of the battery cell 7, a maximum distance LL between widths of the grooves 6 at a middle position of the body portion 1 is larger than a maximum distance L between widths of the grooves 6 at two end positions of the body portion 1, as shown in fig. 9, or the maximum distance L between widths of the grooves 6 gradually increases from two ends of the body portion 1 to the middle of the body portion 1, as shown in fig. 10. By adjusting the width of the heat dissipation air duct 10, the heat dissipation speed of different positions of the battery cell 7 can be adjusted, the middle position of the battery cell 7 generates heat obviously, the width of the heat dissipation air duct 10 at the middle position is increased, and the heat dissipation effect is improved; the heat dissipation air duct 10 at the edge position is reduced, and the damping suction effect of the gasket 20 is improved.

In the present application, the surface of the boss 2 is coated with a layer of heat insulating glue in order to improve it. It can be understood that, in this embodiment of the application, gasket 20 adopts adiabatic glue film and heat insulating material, has good adiabatic ability, prevents the heat exchange between electric core 7, forms recess 6 between bellying 2 simultaneously, and this is not conflicted with adiabatic ability, and adiabatic ability is for reducing the heat exchange between electric core 7 and electric core 7, and recess 6 can make the heat transfer of battery go out between electric core 7 and the electric core 7, prevents that untimely exhaust heat from leading to the battery performance to descend, and then influences battery life.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. Those skilled in the art will appreciate that numerous variations and modifications are possible in light of the teachings of the present invention, and are within the scope of the invention as claimed.

Claims

1. A battery module, comprising:

2. The battery module according to claim 1, wherein one side of the gasket in the first direction is formed with a protrusion that contacts the cell, or both sides of the gasket in the first direction are respectively formed with a protrusion that contacts the cell.

3. The battery module according to claim 2, wherein the gasket includes a body portion and a protruding portion formed on both side surfaces in a thickness direction of the body portion; the convex parts are symmetrically distributed or staggered on the two side surfaces relative to the plane of the body.

4. The battery module according to claim 3, wherein the body is integrally formed with the boss.

5. The battery module of claim 3, wherein the protrusions extend along a width direction of the cell, and the protrusions are spaced apart along a height direction of the cell.

6. The battery module according to claim 3, wherein a bottom edge of the protrusion in the extending direction forms an angle with a side edge of the body portion.

7. The battery module according to claim 5 or 6, wherein a groove is formed between two adjacent protrusions, and a plurality of heat dissipation holes are formed in the groove.

8. The battery module according to claim 5, wherein the cross-sectional shape of the protrusion cut along a plane parallel to the height direction of the cell is an arc.

9. The battery module according to claim 7, wherein in the plurality of grooves formed between the protrusions adjacent to each other in the height direction of the battery cell, a maximum distance between groove widths at the middle position of the body is greater than a maximum distance between groove widths at the two end positions of the body, or the maximum distance between the groove widths gradually increases from the two ends of the body to the middle of the body.

10. The battery module according to claim 2 or 3, wherein a heat insulation glue layer is coated on the surface of the protruding part, and the protruding part is fixedly connected with the battery core through the heat insulation glue layer.