CN114552115A

CN114552115A - Battery module and electric vehicle

Info

Publication number: CN114552115A
Application number: CN202210129709.6A
Authority: CN
Inventors: 李凡; 黄莹; 陈朝海; 陈智伟; 邱文聪; 王鸿鹄; 饶焰
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-05-27

Abstract

The invention belongs to the technical field of power batteries, and discloses a battery module and an electric vehicle. The battery module comprises a box body, a longitudinal beam and a tray. The box body is provided with an exhaust port; the longitudinal beam is arranged in the box body and is abutted against the bottom surface of the box body so as to partition the accommodating areas, which are positioned on two sides of the longitudinal beam in the width direction, in the box body; the tray set up in hold the district for install electric core, be provided with on the tray with the just right through-hole of one end of electric core, the tray with the bottom surface interval of box sets up in order to form the pressure release chamber, the through-hole with the gas vent all with the pressure release chamber intercommunication. The containing areas on the two sides of the longitudinal beam are separated from each other through the longitudinal beam, so that the gas discharged by the battery core out of thermal runaway and the sprayed object can not contact with the battery core in the containing area of the other side, and the battery core in the whole box body is prevented from being thermally runaway due to the fact that the battery core in the containing area of the other side is influenced.

Description

Battery module and electric vehicle

Technical Field

The invention relates to the technical field of power batteries, in particular to a battery module and an electric vehicle.

Background

In recent years, new energy automobiles have been developed, especially new energy automobiles using lithium batteries as power. Cylindrical electric cores in lithium batteries are widely applied in power systems, and single batteries are large in quantity due to small monomer capacity.

In common cylindrical battery module, a plurality of electric cores are set up in same airtight cavity after the matrix is arranged, but when certain electric core thermal runaway, the explosion-proof valve of electric core is opened, and the inside gaseous and the jet discharge back that produces of electric core will influence all the other electric cores, leads to electric core to appear thermal runaway in succession easily to cause the incident.

Be provided with the pressure release chamber in the partial battery module, but a plurality of electric cores still share same pressure release chamber, still can influence all the other electric cores through pressure release chamber after certain electric core thermal runaway, have the potential safety hazard.

Disclosure of Invention

An object of the present invention is to provide a battery module, which can reduce the influence of a thermal runaway battery cell on other battery cells.

In order to achieve the purpose, the invention adopts the following technical scheme:

a battery module, comprising:

a box body provided with an exhaust port;

the longitudinal beam is arranged in the box body and is abutted against the bottom surface of the box body so as to partition the accommodating areas, which are positioned on two sides of the longitudinal beam in the width direction, in the box body;

the tray set up in the accommodation area for install electric core, be provided with on the tray with the just right through-hole of one end of electric core, the tray with the bottom surface interval of box sets up in order to form the pressure release chamber, the through-hole with the gas vent all with the pressure release chamber intercommunication.

As an alternative scheme of the battery module, a cross beam is arranged in the containing area, the cross beam and the longitudinal beam are arranged at an included angle, the cross beam, the longitudinal beam and the inner wall of the box body form a positioning groove in a surrounding mode, and the tray is arranged in the positioning groove.

As an alternative of the above battery module, at least a portion of the cross beam is spaced from the bottom surface of the case to communicate the adjacent two positioning grooves.

As an alternative of the battery module, the box body comprises a bottom protection plate, the bottom protection plate is provided with convex edges and grooves which are arranged at intervals, the convex edges and the grooves extend along the length direction of the longitudinal beam, and the longitudinal beam is fixed on the convex edges.

As an alternative to the above battery module, the cross member abuts against the rib.

As an alternative of the above battery module, at least one of the plurality of ribs has a mounting surface that is attached to a bottom surface of the side member, and the side member is fixed to the mounting surface.

As an alternative to the above battery module, a first seal member is provided between the side member and the mounting surface.

As an alternative of the above battery module, the tray and the bottom protective plate are fixed by a tray fixing bolt.

As an alternative to the above battery module, the tray fixing bolt connects the rib and the tray.

As an alternative of the battery module, a fixing boss is convexly arranged on the back surface of the tray, a threaded hole is formed in the fixing boss, and the tray fixing bolt penetrates through the bottom protection plate and then is in threaded fit with the threaded hole.

As an alternative to the above battery module, a second sealing member is provided between the fixing boss and the backplate.

As an alternative of the above battery module, the second sealing element is sleeved outside the fixing boss and elastically abuts against the bottom protective plate.

As an alternative of the battery module, the box body comprises a bottom guard plate, each side edge of the bottom guard plate is connected with a side plate, one side plate parallel to the beam is a front side plate, the front side plate is provided with the exhaust port, the beam adjacent to the front side plate is a second beam, a sealing plate is arranged between the front side plate and the second beam, the sealing plate and the bottom guard plate are arranged at intervals to form an exhaust passage, the exhaust passage is respectively communicated with the exhaust port and the pressure relief cavity, and the sealing plate is used for installing an electric device.

As an alternative of the above battery module, the front side plate and the second cross beam are both provided with a bearing boss, and the sealing plate is lapped on the bearing boss.

As an alternative of the battery module, a first cavity is arranged in the front side plate, a plurality of partition plates are arranged in the first cavity, the first cavity is divided into a plurality of sub-cavities by the partition plates, and the exhaust port in the front side plate is communicated with the exhaust channel through one sub-cavity.

As an alternative of the above battery module, the box body is provided with the exhaust port corresponding to each of the accommodation areas, and the exhaust port is communicated with the pressure relief cavity in the accommodation area.

As an alternative of the above battery module, the exhaust port is provided at one end or both ends of the case in the longitudinal direction of the side member.

As an alternative of the above battery module, a pressure relief valve is provided in the exhaust port.

As an alternative of the battery module, an explosion-proof valve is arranged at one end of the battery cell, the explosion-proof valve is opposite to the through hole, and the projection of the explosion-proof valve along the height direction of the battery cell is located in the through hole.

As an alternative of the above battery module, the battery module further includes a reinforcing block, the reinforcing block is disposed at a joint of the cross beam and the longitudinal beam, the reinforcing block is disposed in the positioning groove and located at a corner, and the reinforcing block is respectively abutted against or connected with two adjacent side walls of the positioning groove.

As an alternative of the above battery module, second cavities are respectively arranged in the transverse beam and the longitudinal beam along the length direction of the transverse beam and the longitudinal beam, and rib plates arranged in a cross manner are arranged in the second cavities.

As an alternative of the battery module, the positioning groove is a stepped groove and comprises an upper groove body and a lower groove body which are communicated, and a step supporting surface is formed at the joint of the upper groove body and the lower groove body;

the tray includes the disk body and encircles the fixed flange that the disk body circumference set up, the disk body is located in the cell body down, the fixed flange overlap joint in on the step holding surface.

As an alternative of the battery module, a first mounting surface surrounding the periphery of the tray is arranged in the positioning groove, the tray is provided with a second mounting surface, the second mounting surface abuts against the first mounting surface, and the flatness of the second mounting surface and the flatness of the first mounting surface are not more than 0.5 mm.

Another object of the present invention is to provide an electric vehicle, which can prevent a safety accident caused by a battery module, and improve the safety performance of the vehicle.

An electric vehicle comprises the battery module.

As an alternative to the above electric vehicle, the case is formed on the electric vehicle.

The invention has the beneficial effects that:

in the battery module provided by the invention, the containing areas on two sides of the longitudinal beam in the box body are separated by the longitudinal beam, so that gas and jet matters discharged by a thermal runaway battery cell cannot be contacted with the battery cell in the containing area on the other side, and the thermal runaway of the battery cell in the whole box body caused by the influence on the battery cell in the containing area on the other side is avoided.

In the electric vehicle provided by the invention, by adopting the battery module, the phenomenon that the whole battery module is out of control due to thermal runaway of the whole battery module caused by spreading of a certain battery cell after thermal runaway can be avoided.

Drawings

Fig. 1 is a plan view of a battery module provided in the present invention;

fig. 2 is a schematic view of a partial structure of a battery module according to the present invention;

FIG. 3 is a schematic view of a partial structure of a bottom guard plate provided by the present invention;

fig. 4 is a plan view of a partial structure of a battery module according to the present invention;

FIG. 5 is a sectional view taken along line A-A of FIG. 4;

FIG. 6 is a partial enlarged view at B in FIG. 5;

fig. 7 is a sectional view of a partial structure of a battery module according to the present invention.

In the figure:

1. a box body; 11. a bottom guard plate; 111. a rib; 112. a groove; 12. a front side plate; 121. the side plate supports the boss; 122. a partition plate; 13. a left side plate and a right side plate; 14. a rear side plate; 2. a stringer; 3. a cross beam; 31. a first cross member; 32. a second cross member; 321. the crossbeam supports the boss; 4. a tray; 41. a through hole; 42. fixing the boss; 5. an electric core; 6. a sealing plate; 7. a pressure relief valve; 8. a reinforcing block; 91. a tray fixing bolt; 92. a second seal.

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 invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used based on the orientations or positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be arranged in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The present embodiment provides a battery module, which is shown in fig. 1 and 2, and includes a case 1, a longitudinal beam 2, and a tray 4. Longeron 2 sets up in box 1 and with the bottom surface butt of box 1 to lie in the district that holds of longeron 2 along the width direction both sides in cutting off box 1, the district that holds of both sides all is used for installing tray 4. A plurality of cells 5 are arranged on the tray 4 to form a cell group. The tray 4 is provided with a through hole 41 opposite to one end of the battery cell 5, and the tray 4 and the bottom surface of the box body 1 are arranged at intervals to form a pressure relief cavity. The box body 1 is provided with an air outlet, and the through hole 41 and the air outlet are communicated with the pressure relief cavity.

Specifically, one end of the battery cell 5 is provided with an explosion-proof valve, when a certain battery cell 5 is out of control due to heat, the explosion-proof valve on the battery cell 5 is opened, and gas and spray generated in the battery cell 5 enter a pressure release cavity between the tray 4 and the bottom surface of the box body 1 through the through hole 41 and are discharged through the exhaust hole, so that spontaneous combustion or explosion of the battery cell 5 is avoided. In addition, through the aforesaid setting, the area in pressure release chamber is greater than the area of through-hole 41, and the gas that comes out by electricity core 5 pressure release passes through-hole 41 and discharges to the pressure release chamber rapidly, and rethread gas vent discharges after the pressure reduces, is favorable to improving battery module's security performance. Separate the district that holds that is located 2 both sides of longeron in with box 1 through setting up longeron 2 for 5 combustion gas of thermal runaway and jet can not hold the district interior electric core 5 contacts with the opposite side, avoid influencing the opposite side and hold the district interior electric core 5 thermal runaway of electric core 5 leading to whole box 1.

Further, the explosion-proof valve is just right with through-hole 41, and the explosion-proof valve is located through-hole 41 along the projection of electricity core 5 direction of height to make through-hole 41 can provide sufficient space for opening of explosion-proof valve, make the explosion-proof valve open smoothly, open the angle unrestricted, with the very first time when electric core 5 thermal runaway with the gas that produces in electricity core 5 through-hole 41 entering pressure release intracavity, in order to discharge through the gas vent.

Alternatively, the shape of the through hole 41 may be the same as that of the explosion-proof valve. Preferably, the size of the through hole 41 is larger than that of the explosion-proof valve to avoid the explosion-proof valve from being opened to be restricted.

In this embodiment, a longitudinal beam 2 is arranged in the box body 1, the longitudinal beam 2 extends along the X direction, the longitudinal beam 2 divides the box body 1 into two accommodating areas, namely an area a marked by a dotted line in fig. 1, and each accommodating area can be provided with at least one electric core group.

Specifically, box 1 includes end backplate 11 and curb plate, and every side of end backplate 11 all is connected with the curb plate, and a plurality of curb plates enclose into open-top's cell body structure with end backplate 11, and longeron 2 sets up on end backplate 11, and the bottom surface of longeron 2 and end backplate 11 full contact.

In this embodiment, the bottom guard plate 11 is substantially rectangular, and four side plates are provided, namely, two left and right side plates 13, a front side plate 12, and a rear side plate 14. Two of the left and right side plates 13 are arranged in the Y direction, and the front side plate 12 and the rear side plate 14 are arranged in the X direction.

In order to increase the number of the electric cores 5 in the box body 1 and facilitate installation, a cross beam 3 is further arranged in the box body 1. Crossbeam 3 is located and holds the district to be the contained angle setting with longeron 2, crossbeam 3, longeron 2 and box 1's inner wall enclose into the constant head tank, and tray 4 sets up in the constant head tank. Through setting up crossbeam 3, can separate every holding area into two at least installation positions b, can install a core group in every installation position b. This kind of setting makes a plurality of electric cores 5 in the box 1 divide into the multiunit and installs, and the quantity of adaptability adjustment electric core group is removed according to the concrete capacity of box 1 to the convenience, and the equipment mode is more nimble.

Further, crossbeam 3 and longeron 2 protrusion in the bottom surface of box 1 for the constant head tank is enclosed to the inner wall of crossbeam 3, longeron 2 and box 1, and tray 4 sets up in the constant head tank, makes the constant head tank play the location effect to tray 4, makes things convenient for the installation and the fixing of tray 4.

For avoiding electric core 5 thermal runaway time gas in the pressure release intracavity get into tray 4 top space and with electric core 5 contact through the fit-up gap of tray 4 and constant head tank, be provided with in the constant head tank and encircle tray 4 week portion's first installation face, tray 4 has the second installation face, second installation face and first installation face butt, and the second installation face all is not greater than 0.5mm with the plane degree of first installation face.

This embodiment can be with the fitting gap control between first installation face and the second installation face in less within range through the plane degree of controlling first installation face and second installation face, and the gas that lies in the pressure release intracavity in this scope can not pass through this fitting gap to the gas that produces when avoiding electric core 5 thermal runaway gets into tray 4 top space, thereby avoids electric core 5 thermal runaway to stretch, is favorable to improving battery module's security performance.

In addition, through the flatness of controlling first installation face and second installation face, need not set up the sealing member between first installation face and the second installation face, be favorable to simplifying battery module's structure, reduce the assembly degree of difficulty.

Alternatively, the flatness of the first and second mounting surfaces may be 0.4mm, 0.3mm, 0.2mm, or 0.1 mm.

In other embodiments, a sealing member is disposed between the first mounting surface and the second mounting surface to seal a fitting gap between the first mounting surface and the second mounting surface, so that gas in the pressure relief cavity can be prevented from entering a space above the tray 4 through the fitting gap, thereby preventing the thermal runaway of the battery cell 5.

In this embodiment, the beam 3 extends along the Y direction, wherein the X direction is perpendicular to the Y direction, so that each installation site is substantially rectangular, the shape is regular, the arrangement of the battery cells 5 in each battery cell group is facilitated, and the space in the box body 1 is favorably utilized.

Optionally, the tray 4 comprises a tray body and a fixing flange provided around the circumference of the tray body, the second mounting surface being located at the bottom surface of the fixing flange. The positioning groove is a stepped groove and comprises an upper groove body and a lower groove body. The size of the upper tank body is larger than that of the lower tank body, so that a step supporting surface is formed at the connecting position of the upper tank body and the lower tank body, and the step supporting surface is a first mounting surface. Specifically, the bottom of the side wall of the box body 1 which forms the positioning groove is convexly provided with a fixing boss, the cross beam 3 and the longitudinal beam 2 form a lower groove body, the top surface of the fixing boss, the top surface of the cross beam 3 and the top surface of the longitudinal beam 2 form a step supporting surface, and the top of the side wall of the box body 1 forms an upper groove body. The fixed flange is lapped on the step supporting surface, and the tray body is positioned in the lower groove body, so that the bottom surface of the tray 4 can be arranged at intervals with the bottom protection plate 11, and a pressure relief cavity is formed. Optionally, the fixing flange can be fixedly connected with the step supporting surface through a screw, and the mounting is convenient.

Alternatively, the number of cross beams 3 and longitudinal beams 2 may be determined according to the specific size of the box 1. In the present embodiment, as shown in fig. 2, there are one longitudinal beam 2 and two transverse beams 3, namely, a first transverse beam 31 and a second transverse beam 32. The first cross beam 31 is arranged in the middle of the longitudinal beam 2 and is in a cross shape with the longitudinal beam 2; the middle portion of the second cross member 32 abuts on one end of the longitudinal member 2. Enclose into two holding areas and four installation positions b through longeron 2, two crossbeams 3 and box 1, all be provided with a core group in every installation position b.

In the prior art, a plurality of battery cells 5 in the box body 1 are usually arranged on a rack body with a large size, and the rack body is fixed in the box body 1 through adhesive bonding. Because the size of the frame body is large, the frame body is generally fixed with the box body 1 only on the periphery, the middle part of the frame body is not supported enough, and the frame body is easy to deform. Therefore, the structure has higher requirement on the strength of the frame body, simultaneously increases the requirement on the adhesive bonding effect, and has large manufacturing difficulty and high production cost.

In the embodiment, the cross beam 3 and the longitudinal beam 2 are arranged in the box body 1, so that the strength of the box body 1 can be improved, and the requirement on the material of the box body 1 is reduced; the space in the box body 1 is divided into a plurality of installation positions b with smaller sizes by the cross beams 3 and the longitudinal beams 2. The plurality of small-sized trays 4 are used for replacing a large-sized rack body in the prior art, so that the strength of each tray 4 is increased, the stability of the structure of the electric core assembly is improved, the requirement on the fixing strength of the trays 4 is reduced, and the manufacturing difficulty and the manufacturing cost are reduced.

Further, still be provided with boss 8 in the box 1, boss 8 sets up in the constant head tank to be located the corner of constant head tank. The reinforcing block 8 is respectively abutted or connected with the side walls at two adjacent sides of the positioning groove so as to improve the strength of the box body 1.

In this embodiment, the constant head tank is the rectangular channel, and four corners of constant head tank all are provided with boss 8 to further improve box 1's intensity. Specifically, reinforcing blocks 8 are arranged at the joint of the cross beam 3 and the fixed boss, the joint of the cross beam 3 and the longitudinal beam 2 and the joint of the longitudinal beam 2 and the fixed boss.

In order to simplify the structure of the box body 1, a group of exhaust ports is arranged on the box body 1 corresponding to each containing area, and a plurality of pressure relief cavities in the same containing area are communicated, so that a plurality of installation positions b in the same containing area share one group of exhaust ports.

In this embodiment, each set of exhaust ports includes two exhaust ports to increase the exhaust flow rate. In other embodiments, one, three or more exhaust ports may be disposed in each group of exhaust ports.

In order to communicate a plurality of pressure relief chambers in the same accommodating area, at least part of the cross beam 3 is arranged at intervals with the bottom protection plate 11, so that the adjacent pressure relief chambers can be communicated through a gap between the cross beam 3 and the bottom protection plate 11.

As shown in fig. 3, in the present embodiment, the bottom protection plate 11 is provided with ribs 111 and grooves 112 arranged at intervals, the ribs 111 and the grooves 112 both extend along the length direction of the longitudinal beam 2, and the longitudinal beam 2 is fixed on the ribs 111. The rib 111 and the groove 112 are arranged on the bottom protection plate 11, so that on one hand, the strength of the bottom protection plate 11 can be improved; on the other hand, by mounting the longitudinal beam 2 on the rib 111, complete contact of the longitudinal beam 2 with the rib 111 can be ensured to separate the two accommodation areas.

In addition, the battery module includes multirow electric core group, and every row of electric core group is including being located a plurality of electric cores 5 on same tray 4, and every row of electric core group is arranged along the length direction of longeron 2, and multirow electric core group is arranged along the length direction of crossbeam 3. In combination with the arrangement of the ribs 111 and the grooves 112, the air discharge positions of each cell 5 in each row of the cell groups are the same, and the air discharge positions of different cell groups may be different. For example, the exhaust position of part electric core group is just right with bead 111, and the exhaust position of part electric core group is just right with recess 112, and the exhaust position of part electric core group is located the handing-over department of bead 111 and recess 112, and then makes the exhaust height of different electric core groups different for gaseous dispersion in the pressure release intracavity, the exhaust of every row of electric core group is relatively independent, improves battery module's factor of safety.

Further, the cross member 3 abuts on the rib 111. Through making crossbeam 3 and bead 111 butt for crossbeam 3 sets up with recess 112 interval, guarantees crossbeam 3 and backplate 11 local contact, with the decompression chamber intercommunication in the same accommodation area.

In this embodiment, through setting up the district that holds of independent pressure release and along 2 length direction extension's of longeron recess 112 and bead 111, make every hold the district and realize independent pressure release and directional pressure release, can guarantee that the gas that the thermal runaway produced can discharge outside box 1 rapidly, reduce the exhaust pressure in every holding the district, make the exhaust pressure in every side holding the district not higher than 15 kPa, on same electric core 5 quantity and the same 1 volume basis of box, the battery module that this embodiment provided can further improve factor of safety.

Further, as shown in fig. 2 and 3, an exhaust port is disposed at one end or both ends of the box body 1 along the length direction of the longitudinal beam 2, so that the gas in the pressure relief cavity flows along the length direction of the longitudinal beam 2 and is exhausted through the exhaust port. Specifically, the exhaust port is provided on the front side plate 12. Because of recess 112 extends along the length direction of longeron 2 for recess 112 has the effect that the guide air current flows, makes things convenient for gas flow to the gas vent to discharge, when guaranteeing electric core 5 thermal runaway, the inside gas that produces of electric core 5 and jet can be discharged through the gas vent along recess 112 rapidly, improves the security of battery module, avoids leading to the electric core 5 thermal runaway of whole battery module.

Further, in order to ensure that the ribs 111 are completely contacted with the longitudinal beam 2, one of the ribs 111 is provided with a mounting surface, the mounting surface is attached to the bottom surface of the longitudinal beam 2, and the longitudinal beam 2 is fixed on the mounting surface. The mounting surface and the bottom surface of the longitudinal beam 2 are the same in shape, so that the mounting surface and the bottom surface of the longitudinal beam 2 can be completely attached.

In the present embodiment, the bottom surface of the side member 2 is a flat surface, and correspondingly, the mounting surface is a flat surface.

In order to make the installation position of the longitudinal beam 2 more flexible, each rib 111 is referred to as an installation surface, and the longitudinal beam 2 can be installed on any rib 111 according to actual needs.

Further, a first seal is provided between the longitudinal beam 2 and the mounting surface. The first sealing element is clamped between the longitudinal beam 2 and the mounting surface, and can block a gap between the longitudinal beam 2 and the mounting surface so as to improve the sealing effect between the longitudinal beam 2 and the mounting surface.

Optionally, a first seal extends along the length of the stringer 2 to improve the sealing effect between the stringer 2 and the mounting surface.

Alternatively, the longitudinal beams 2 and the transverse beams 3 may be fixed to the bottom cover plate 11 by fasteners such as bolts, or may be fixed by welding, clamping, or bonding.

In order to avoid that the middle part of the tray 4 is deformed under the influence of the gravity of the battery cell 5 to influence the normal exhaust of the pressure relief cavity, as shown in fig. 4-6, the bottom surface of the tray 4 and the bottom protection plate 11 are fixed through a tray fixing bolt 91. The tray fixing bolts 91 can further fix the tray 4 to the case 1 on the one hand, and can also support the tray 4 on the other hand to prevent the tray 4 from being deformed.

Specifically, the tray fixing bolt 91 passes through the bottom protection plate 11 from the bottom of the bottom protection plate 11 and is fixed to the tray 4, so as to prevent the tray fixing bolt 91 from affecting the arrangement of the plurality of battery cells 5 on the tray 4.

In order to ensure the fixing effect of the tray fixing bolt 91 and the tray 4, a fixing boss 42 is convexly arranged on the back surface of the tray 4, a threaded hole is arranged on the fixing boss 42, and a communication hole 41 is arranged on the bottom protection plate 11. The tray fixing bolt 91 passes through the communication hole 41 and then is in threaded fit with the threaded hole. Through setting up fixed boss 42, can local increase tray 4's thickness to guarantee the degree of depth of screw hole, with the spiral cooperation degree of depth that improves tray fixing bolt 91 and tray 4, thereby improve the fixed effect of tray fixing bolt 91 and tray 4 and to the support stability of tray 4.

In order to avoid the communicating hole 41 from exhausting the pressure relief chamber from the communicating hole 41 to the outside, a second sealing member 92 is provided between the fixing boss 42 and the backplate 11 to seal the communicating hole 41. In addition, the second sealing member 92 can prevent the fixing boss 42 and the bottom protection plate 11 from being excessively compressed, which is beneficial to protecting the tray 4 and the bottom protection plate 11.

Optionally, the second sealing element 92 is sleeved outside the fixing boss 42 and elastically abuts against the bottom protection plate 11. This arrangement is more compact and the mounting boss 42 can provide a locating effect for the second seal 92.

Further, the communication hole 41 is provided on the rib 111, that is, the tray fixing bolt 91 fixedly connects the bottom guard plate 11 and the rib 111. This kind of setting can reduce the distance between backplate 11 and the tray 4 at the end, is favorable to reducing the height of fixed boss 42 to reduce cost improves backplate 11 and tray 4 hookup location's intensity at the end.

Since electric devices are also required to be provided in the battery module, in order to provide a space for mounting the electric devices, as shown in fig. 1, 2 and 7, in the present embodiment, the second beam 32 and the front side plate 12 are spaced apart, and the sealing plate 6 is provided between the second beam 32 and the front side plate 12, and the sealing plate 6 is used for mounting the electric devices. The sealing plate 6 and the bottom protection plate 11 are arranged at intervals to form an exhaust passage, and the accommodating area on each side is communicated with an exhaust port on the front side plate 12 through the exhaust passage.

In order to facilitate the installation of the sealing plate 6, bearing bosses are arranged on the front side plate 12 and the second cross beam 32, and the two opposite side edges of the sealing plate 6 are lapped on the bearing bosses so that the sealing plate 6 is fixed. Defining the bearing boss on the front side plate 12 as a side plate bearing boss 121, wherein the side plate bearing boss 121 is arranged on one side of the front side plate 12 facing the second cross beam 32; the support boss defining the second beam 32 is a beam support boss 321, and the beam support boss 321 is disposed on a side of the second beam 32 facing the front side plate 12.

Alternatively, the sealing plate 6 may be fixed to the bottom protection plate 11 by a sealing plate fixing bolt, wherein the structure and fixing manner of the sealing plate fixing bolt may refer to the tray fixing bolt 91, and this embodiment will not be described in detail.

Optionally, a third sealing element is disposed between the sealing plate 6 and the beam bearing boss 321, and between the sealing plate 6 and the side plate bearing boss 121, so as to prevent the exhaust gas from contacting the electric device on the sealing plate 6 when the battery cell is out of thermal control.

In other embodiments, the sealing plate 6 may be fixed to the side plate support bosses 121 and the cross member support bosses 321 by bonding, clamping, or the like.

As shown in fig. 7, the front plate 12 is hollow and communicates with the pressure release passage. The air enters the front side plate 12 through the pressure relief channel and is exhausted through the exhaust port. Be provided with a plurality of baffles 122 in the first cavity, baffle 122 separates first cavity for a plurality of subchambers, and the gas vent is through a subchamber and pressure release channel intercommunication. Through setting up baffle 122, can place in gaseous other subchambers that get into, be favorable to realizing directional exhaust to improve exhaust speed, improve battery module's security performance.

In this embodiment, a pressure release valve 7 is arranged at the exhaust port, and the pressure release valve 7 can be automatically opened when the exhaust pressure reaches a preset value, so that the exhaust port automatically exhausts when exhaust is needed, and is closed when exhaust is not needed. Here, the relief valve 7 may be configured by any one of the conventional techniques.

Optionally, second cavities are formed in the cross beam 3 and the longitudinal beam 2 in the length direction, and rib plates arranged in a crossed mode are arranged in the second cavities. The cross beam 3 and the longitudinal beam 2 are arranged to be hollow structures, so that the gravity of the cross beam 3 and the longitudinal beam 2 can be reduced; the strength of the cross beam 3 and the longitudinal beam 2 can be improved by arranging rib plates.

The embodiment also provides an electric vehicle which comprises the battery module. This electric vehicle adopts above-mentioned battery module, can avoid stretching behind certain electric core 5 thermal runaway to lead to other electric cores 5, avoids leading to whole battery module thermal runaway.

Further, the case 1 in the battery module may be formed on the electric vehicle to reduce the number of parts.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery module, comprising:

a box body (1) provided with an exhaust port;

the longitudinal beam (2) is arranged in the box body (1) and is abutted against the bottom surface of the box body (1) so as to partition the accommodating areas, located on the two sides of the longitudinal beam (2) in the width direction, in the box body (1);

tray (4), set up in hold in the district for installation electric core (5), be provided with on tray (4) with just right through-hole (41) of one end of electric core (5), tray (4) with the bottom surface interval of box (1) sets up in order to form the pressure release chamber, through-hole (41) with the gas vent all with the pressure release chamber intercommunication.

2. The battery module according to claim 1, wherein a cross beam (3) is arranged in the accommodating area, the cross beam (3) and the longitudinal beam (2) form an included angle, a positioning groove is defined by the cross beam (3), the longitudinal beam (2) and the inner wall of the box body (1), and the tray (4) is arranged in the positioning groove.

3. The battery module according to claim 2, wherein at least a portion of the cross member (3) is spaced from the bottom surface of the case (1) to communicate with two adjacent positioning grooves.

4. The battery module according to claim 2, wherein the case (1) comprises a bottom protective plate (11), the bottom protective plate (11) is provided with ribs (111) and grooves (112) which are arranged at intervals, the ribs (111) and the grooves (112) extend along the length direction of the longitudinal beam (2), and the longitudinal beam (2) is fixed on the ribs (111).

5. The battery module according to claim 4, wherein the cross member (3) abuts against the rib (111).

6. The battery module according to claim 4, wherein at least one of the ribs (111) has a mounting surface which abuts against a bottom surface of the side member (2), and the side member (2) is fixed to the mounting surface.

7. The battery module according to claim 6, wherein a first seal is provided between the side member (2) and the mounting surface.

8. The battery module according to claim 4, wherein the tray (4) and the floor sheathing plate (11) are fixed by a tray fixing bolt (91).

9. The battery module according to claim 8, wherein the tray fixing bolt (91) connects the rib (111) and the tray (4).

10. The battery module according to claim 8, wherein a fixing boss (42) is convexly arranged on the back surface of the tray (4), a threaded hole is arranged on the fixing boss (42), and the tray fixing bolt (91) penetrates through the bottom protection plate (11) and is in threaded fit with the threaded hole.

11. The battery module according to claim 10, wherein a second seal member (92) is provided between the fixing boss (42) and the backplate (11).

12. The battery module according to claim 11, wherein the second sealing member (92) is sleeved outside the fixing boss (42) and elastically abuts against the bottom protective plate (11).

13. The battery module according to claim 2, wherein the box body (1) comprises a bottom guard plate (11), a side plate is connected to each side edge of the bottom guard plate (11), a side plate parallel to the cross beam (3) is a front side plate (12), the front side plate (12) is provided with the exhaust port, the cross beam (3) adjacent to the front side plate (12) is a second cross beam (32), a sealing plate (6) is arranged between the front side plate (12) and the second cross beam (32), the sealing plate (6) and the bottom guard plate (11) are arranged at intervals to form an exhaust channel, the exhaust channel is respectively communicated with the exhaust port and the pressure relief cavity, and the sealing plate (6) is used for installing an electric device.

14. The battery module according to claim 13, wherein the front side plate (12) and the second cross member (32) are each provided with a support boss on which the sealing plate (6) is attached.

15. The battery module according to claim 13, wherein a first cavity is provided in the front side plate (12), a plurality of partition plates (122) are provided in the first cavity, the partition plates (122) divide the first cavity into a plurality of sub-cavities, and the exhaust port in the front side plate (12) communicates with the exhaust passage through one of the sub-cavities.

16. The battery module according to claim 4, wherein the case (1) is provided with the vent port corresponding to each of the receiving areas, the vent port being communicated with the pressure relief cavity in the corresponding receiving area.

17. The battery module according to claim 4, wherein the exhaust port is provided at one or both ends of the case (1) in the longitudinal direction of the side member (2).

18. The battery module according to any one of claims 1 to 17, wherein a pressure relief valve (7) is provided in the exhaust port.

19. The battery module according to any one of claims 1-17, wherein an explosion-proof valve is arranged at one end of the battery cell (5), the explosion-proof valve is opposite to the through hole (41), and a projection of the explosion-proof valve along the height direction of the battery cell (5) is positioned in the through hole (41).

20. The battery module according to any one of claims 2 to 17, further comprising reinforcing blocks (8), wherein the reinforcing blocks (8) are arranged in the positioning grooves and located at corners, and the reinforcing blocks (8) are respectively abutted against or connected with two side walls adjacent to the positioning grooves.

21. The battery module according to any one of claims 2-17, wherein second cavities are formed in the cross beam (3) and the longitudinal beam (2) along the length direction of the cross beam, and rib plates are arranged in the second cavities in a crossed manner.

22. The battery module according to any one of claims 2-17, wherein the positioning groove is a stepped groove comprising an upper groove body and a lower groove body which are communicated, and a step supporting surface is formed at the joint of the upper groove body and the lower groove body;

the tray (4) comprises a tray body and a fixing flange arranged around the circumferential direction of the tray body, the tray body is positioned in the lower groove body, and the fixing flange is lapped on the step supporting surface.

23. The battery module according to any one of claims 2-17, wherein a first mounting surface surrounding the periphery of the tray (4) is arranged in the positioning groove, the tray (4) has a second mounting surface, the second mounting surface abuts against the first mounting surface, and the flatness of the second mounting surface and the first mounting surface is not more than 0.5 mm.

24. An electric vehicle characterized by comprising the battery module according to any one of claims 1 to 23.

25. Electric vehicle according to claim 24, characterized in that the tank (1) is formed on the electric vehicle.