CN220856784U - Battery pack - Google Patents

Abstract

The utility model relates to the technical field of power batteries and discloses a battery pack which comprises a battery module, a module tray and a box body, wherein the battery module is provided with an explosion-proof valve, the module tray is positioned at the bottom of the battery module, the module tray is provided with an exhaust hole, the exhaust hole and the explosion-proof valve are correspondingly arranged, the box body is provided with an exhaust channel communicated with the outside, the battery module and the module tray are both arranged in the box body, an exhaust gap is arranged between the module tray and the bottom wall of the box body, and the exhaust channel is communicated with the exhaust hole through the exhaust gap. According to the battery pack, the battery module is supported and packaged through the module tray and the box body, and the exhaust can be realized in time when the battery pack is out of control, so that the use safety of the battery pack is ensured, the battery pack is integrated into a whole and is dual-purpose, an independent exhaust structure is not required to be arranged in the battery pack, the integrated level of the whole structure of the battery pack is high, the size is smaller, and the lightweight design of the battery pack is facilitated.

Description

Battery pack

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery pack.

Background

With the concern of safety performance, the use safety of the battery pack is particularly important, and when the battery pack is in thermal runaway, a large amount of flammable gas can be generated, and if the flammable gas is not timely discharged outside the battery pack, the battery pack is easy to fire, so that safety accidents are caused.

The battery pack is internally provided with a plurality of battery modules in a sealing mode, each battery module is formed by connecting a plurality of battery cores in series and parallel, each battery core is provided with an explosion-proof valve so as to be opened for exhausting the battery module when the battery cores are out of control, in the prior art, an independent exhausting structure is generally arranged in the battery pack, the exhausting structure and the explosion-proof valve of each battery core are communicated so as to exhaust air when the explosion-proof valve is opened, the exhausting structure and the battery modules are packaged in the battery pack, and the battery pack also needs to be packaged to support and cool the battery modules, so that the whole structure of the battery pack is large in size and is not beneficial to lightweight design.

Disclosure of utility model

In view of this, the utility model provides a battery pack to solve the problems of the existing battery pack that the whole structure is large in size and unfavorable for lightweight design due to the arrangement of an independent exhaust structure.

The utility model provides a battery pack, which comprises a battery module, a module tray and a box body, wherein the battery module is provided with an explosion-proof valve, the module tray is positioned at the bottom of the battery module, the module tray is provided with an exhaust hole, the exhaust hole and the explosion-proof valve are correspondingly arranged, the box body is provided with an exhaust channel communicated with the outside, the battery module and the module tray are both arranged in the box body, an exhaust gap is arranged between the module tray and the bottom wall of the box body, and the exhaust channel is communicated with the exhaust hole through the exhaust gap.

The beneficial effects are that: the battery module is supported and supported through the module tray, the module tray is provided with an exhaust hole corresponding to the explosion-proof valve of the battery module, the exhaust hole is communicated with an exhaust channel on the box body through an exhaust gap between the module tray and the bottom wall of the box body, when thermal runaway occurs in a battery pack, the explosion-proof valve of the battery module is opened, internal gas flows through the explosion-proof valve and the exhaust hole into the exhaust gap, and the gas in the exhaust gap is exhausted to the outside of the box body through the exhaust channel. According to the battery pack, the battery module is supported and packaged through the module tray and the box body, and the exhaust can be realized in time when the battery pack is out of control, so that the use safety of the battery pack is ensured, the battery pack is integrated into a whole and is dual-purpose, an independent exhaust structure is not required to be arranged in the battery pack, the integrated level of the whole structure of the battery pack is high, the size is smaller, and the lightweight design of the battery pack is facilitated.

In an alternative embodiment, the exhaust passage includes a first passage, a second passage, and a third passage in a stepped and low-to-high arrangement, the first passage and the second passage communicating, the second passage and the third passage communicating, at least one of the first passage, the second passage, and the third passage communicating with the exhaust gap, at least one communicating with the outside.

The beneficial effects are that: through setting up exhaust passage be cascaded and by low first passageway, second passageway and the third passageway that highly arrange, when thermal runaway exhausts, gas gets into the exhaust clearance from the exhaust hole, then flows into in first passageway, second passageway and the third passageway through the exhaust clearance and then discharges to outside to realize safe exhaust, promote exhaust efficiency.

In an alternative embodiment, the box includes upper cover and lower box, the lower box has openly, the upper cover lid is located open and with the cooperation of lower box forms and holds the chamber, battery module with the module tray all set up in hold the chamber, exhaust gap is located the module tray with between the diapire of lower box, exhaust passage set up in the lower box.

The beneficial effects are that: the battery module and the module tray are placed in the lower box body through the opening, the upper cover is used for sealing the opening so as to integrally install the battery module and the module tray in the accommodating cavity, and the battery module and the module tray are exhausted through an exhaust gap between the module tray and the bottom wall of the lower box body and are exhausted to the outside through an exhaust channel on the lower box body.

In an alternative embodiment, the lower case includes a support frame and a bottom guard plate, the top of the support frame is connected to the upper cover, the bottom guard plate is connected to the bottom of the support frame, the upper cover, the support frame, and the bottom guard plate cooperate to form the accommodating cavity, the exhaust gap is formed between the bottom guard plate and the module tray, and the exhaust channel is disposed in the support frame.

The beneficial effects are that: the lower box body is arranged into a supporting frame and a bottom guard plate, the supporting frame plays a role in supporting and reinforcing the connection of the upper cover and the bottom guard plate, the structural strength and rigidity of the integral fit of the upper cover, the supporting frame and the bottom guard plate are ensured, the exhaust channel is arranged on the supporting frame, and compared with other positions, the normal exhaust of the exhaust channel can be realized without weakening the structural strength of the supporting frame.

In an alternative embodiment, the lower case further includes a reinforcing beam, and the reinforcing beam is connected to the support frame.

The beneficial effects are that: the stiffening beam can further strengthen the structural strength of the supporting frame, and further improve the overall structural strength of the lower box body.

In an alternative embodiment, the stiffening beam comprises a beam body, a first stiffener and a second stiffener, the beam body is fixedly connected with the outer wall of the support frame, the first stiffener is obliquely arranged, the lower end of the first stiffener is connected with the beam body, the higher end of the first stiffener is connected with the outer wall of the support frame, the second stiffener is obliquely arranged, the higher end of the second stiffener is connected with the beam body, and the lower end of the second stiffener is connected with the outer wall of the support frame.

The beneficial effects are that: the beam body carries out structural reinforcement to braced frame's outer wall, and first strengthening rib, second strengthening rib slope set up simultaneously to support braced frame's outer wall's upside and downside simultaneously respectively through first strengthening rib, second strengthening rib, in order to transmit braced frame's atress to the beam body, thereby reduce braced frame's deformation or rupture condition.

In an alternative embodiment, the beam body is internally provided with intersecting cross bars.

The beneficial effects are that: the crossed cross ribs are arranged in the beam body to strengthen the structural strength of the beam body, so that the structural strength of the whole lower box body is improved.

In an alternative embodiment, the module tray includes an upper plate and a lower plate connected to each other, the upper plate contacts with the bottom of the battery module, the lower plate is connected to the case, and the upper plate and the lower plate are both provided with the vent holes that are conductive.

The beneficial effects are that: the module tray is arranged into a double-layer structure form of the upper plate and the lower plate, so that the rigidity of the whole structure is higher, and the support of an oversized battery module can be met.

In an alternative embodiment, the module tray is further provided with a mounting table adapted to mount an electrical component; and/or, the module tray is also provided with a mounting hole which is convenient to connect with the box body; and/or, the battery pack further comprises a supporting piece, wherein the supporting piece is arranged in the box body and positioned below the module tray.

The beneficial effects are that: so that the module tray further can be used as an installation piece of an electric element on the basis of meeting the requirements of supporting the battery module and exhausting, an additional installation structure is not required for installing the electric element, the structure is further reduced, the integration level of the battery pack is improved, the installation holes are convenient for the connection of the module tray and the box body, the support piece supports the module tray, the deformation resistance of the module tray is improved, and the deformation collapse risk of the module tray is reduced.

In an alternative embodiment, the support is a resilient support structure.

The beneficial effects are that: the elastic supporting structure has certain elastic energy absorption and buffering functions, and can effectively absorb impact force when the bottom guard plate receives external impact force, so that the battery module and the explosion-proof valve are protected, and the whole battery pack is protected safely.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic view showing an overall exploded structure of a battery pack according to an embodiment of the present utility model;

fig. 2 is a partially exploded view of a battery pack according to an embodiment of the present utility model;

Fig. 3 is a partial perspective view illustrating a battery pack according to an embodiment of the present utility model;

FIG. 4 is a schematic view of a module tray according to an embodiment of the present utility model;

FIG. 5 is a schematic view of a module tray according to another embodiment of the present utility model;

FIG. 6 is a schematic view of a modular tray according to yet another embodiment of the present utility model;

FIG. 7 is a schematic view of a module tray according to another embodiment of the present utility model;

FIG. 8 is a schematic view of a support frame according to an embodiment of the present utility model;

FIG. 9 is an enlarged schematic view of the structure shown at B in FIG. 3;

FIG. 10 is a cross-sectional view taken along the direction A in FIG. 8;

Fig. 11 is a schematic view showing an exploded structure of the module tray, the support member and the bottom cover plate according to an embodiment of the present utility model.

Reference numerals illustrate:

1. A battery module; 2. a module tray; 21. an upper plate; 22. a lower plate; 221. an exhaust hole; 222. installing a table top; 23. a mounting hole; 231. a first mounting hole; 232. a second mounting hole; 3. a case; 31. an upper cover; 311. a fixed cover; 3111. an access opening; 312. an access cover; 32. a support frame; 321. a cross beam; 322. a longitudinal beam; 323. a middle cross beam; 33. a bottom guard board; 34. a step structure; 341. an exhaust passage; 3411. a first channel; 3412. a second channel; 34121. an exhaust inlet; 3413. a third channel; 34131. a pressure relief port; 35. a stiffening beam; 351. a beam body; 352. a first reinforcing rib; 353. a second reinforcing rib; 354. cross ribs; 4. a support; 5. and (3) a cooling structure.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 11, according to an embodiment of the present utility model, there is provided a battery pack including a battery module 1, a module tray 2, and a case 3, wherein the battery module 1 is provided with an explosion-proof valve, the module tray 2 is located at the bottom of the battery module 1, the module tray 2 is provided with an exhaust hole 221, the exhaust hole 221 and the explosion-proof valve are correspondingly disposed, the case 3 is provided with an exhaust passage 341 communicating with the outside, the battery module 1 and the module tray 2 are both disposed in the case 3, an exhaust gap is provided between the module tray 2 and the bottom wall of the case 3, and the exhaust passage 341 communicates with the exhaust hole 221 through the exhaust gap.

The battery pack of this embodiment supports the bearing through module tray 2 to battery module 1, and be equipped with the exhaust hole 221 that corresponds with the explosion-proof valve of battery module 1 on the module tray 2, exhaust hole 221 communicates with the exhaust channel 341 on the box 3 through the exhaust clearance between the diapire of module tray 2 and box 3, when the thermal runaway appears in the battery pack, the explosion-proof valve of battery module 1 opens, and inside gas flow explosion-proof valve, exhaust hole 221 inflow exhaust clearance in, the outside of the gas rethread exhaust channel 341 row to box 3 in the exhaust clearance. According to the battery pack, the battery module 1 is supported and packaged through the module tray 2 and the box body 3, and the exhaust can be realized in time when the battery pack is out of control, so that the use safety of the battery pack is ensured, the battery pack is integrated and dual-purpose, an independent exhaust structure is not required to be arranged in the battery pack, the integrated level of the whole structure of the battery pack is high, the size is smaller, and the lightweight design of the battery pack is facilitated.

In this embodiment, as shown in fig. 1, the battery module 1 includes a plurality of series-parallel electric cores (series connection and parallel connection of a plurality of electric cores are set in the prior art, which are not described here again), and an explosion-proof valve is disposed at the bottom of each electric core, so as to exhaust in time when each electric core is out of control. The battery cell can be a cylindrical battery cell or a rectangular battery cell, the battery cell of the embodiment selects the cylindrical battery cell, and a plurality of cylindrical battery cells are arranged in rows to form the rectangular battery module 1.

As for the number of the battery modules 1 provided in the battery pack, the number may be set according to the battery capacity of the battery pack, for example, the battery modules 1 may be set to 2, 4, or more according to the capacity size of the battery pack, etc., and the embodiment is not particularly limited.

As shown in fig. 2 and 3, the air vent 221 is a through hole penetrating the module tray 2, and the air vent 221 may be a circular hole, an oval hole, a geometric hole, or the like.

In terms of the number, the plurality of exhaust holes 221 can be formed in the module tray 2, and the plurality of exhaust holes 221 and the plurality of explosion-proof valves are arranged in a one-to-one correspondence manner, so that each explosion-proof valve which is possibly opened can be independently and timely exhausted through each exhaust hole 221, and the use safety of the battery pack is ensured.

As shown in fig. 3 and 4, the module tray 2 can support and fix the battery module 1, so that the battery module 1 is stably placed in the case 3. The module tray 2 may have a circular, oval or geometric shape, and in this embodiment, the module tray 2 is rectangular to match the rectangular battery module 1.

For the concrete material, the module tray 2 can be made of novel high-strength lightweight materials such as extruded aluminum, die-cast aluminum, foamed aluminum and glass fiber reinforced plastic.

As shown in fig. 1 and 5, in some embodiments, a plurality of module trays 2 may be disposed, and the plurality of module trays 2 and the plurality of battery modules 1 are disposed in a one-to-one correspondence manner, so that the plurality of battery modules 1 are supported in a one-to-one correspondence manner by the plurality of module trays 2, and the plurality of module trays 2 are disposed in a plurality of manners, which is also convenient for modular production, manufacturing and transportation.

As shown in fig. 6, in some embodiments, the module tray 2 includes an upper plate 21 and a lower plate 22 connected, wherein the upper plate 21 is in contact with the bottom of the battery module 1, the lower plate 22 is connected to the case 3, and the upper plate 21 and the lower plate 22 are each provided with a vent hole 221 that is conductive. The module tray 2 is provided in a double-layer structure of the upper plate 21 and the lower plate 22, so that the overall structural rigidity is higher, and the support of the oversized battery module 1 can be satisfied.

As shown in fig. 7, in some embodiments, the module tray 2 is further provided with a mounting table 222, and the mounting table 222 is suitable for mounting electrical components, so that the module tray 2 can be further used as a mounting member for the electrical components on the basis of meeting the requirements of supporting the battery module 1 and exhausting, and the electrical components are not required to be mounted by an additional mounting structure, so that the structural arrangement is further reduced, and the integration level of the battery pack is improved.

Specifically, the mounting surface 222 may be disposed on the lower plate 22, that is, a portion of the lower plate 22 extending beyond the region where the vent hole 221 is not formed is used as the mounting surface 222.

In addition, as shown in fig. 4 or 6, the module tray 2 is further provided with a mounting hole 23 which is convenient to connect with the box 3, the mounting hole 23 and the air outlet 221 are staggered, and the mounting hole 23 is convenient to connect the module tray 2 with the box 3.

As shown in fig. 8 and 10, in the present embodiment, the exhaust passage 341 includes a first passage 3411, a second passage 3412, and a third passage 3413 which are arranged stepwise and from low to high, wherein the first passage 3411 and the second passage 3412 communicate, the second passage 3412 and the third passage 3413 communicate, and at least one of the first passage 3411, the second passage 3412, and the third passage 3413 communicates with the exhaust gap, and at least one communicates with the outside.

By arranging the exhaust channels 341 in a stepped and low-to-high arrangement of the first channel 3411, the second channel 3412 and the third channel 3413, when the thermal runaway exhaust is performed, gas enters the exhaust gap from the exhaust hole 221 and then flows into the first channel 3411, the second channel 3412 and the third channel 3413 through the exhaust gap and is discharged to the outside, so that the safety exhaust is realized and the exhaust efficiency is improved.

Alternatively, as shown in fig. 2, 8 and 10, the first and second passages 3411 and 3412 have an exhaust gas inlet 34121 communicating with the exhaust gap, and the third passage 3413 has a pressure relief port 34131 communicating with the outside. The gas in the exhaust gap enters the first channel 3411 and the second channel 3412 through the exhaust inlet 34121, then the gas in the first channel 3411 flows into the second channel 3412 and is converged to the third channel 3413 together with the gas in the second channel 3412, and finally the gas is discharged to the outside through the pressure relief port 34131.

It can be appreciated that an explosion-proof structure can be disposed at the pressure relief opening 34131, and the explosion-proof structure is closed during normal use of the battery pack, so as to ensure the use tightness of the battery pack, and is opened when the battery pack is in thermal runaway, so as to communicate the third channel 3413 with the outside, thereby realizing safe exhaust.

As shown in fig. 1 to 3, the case 3 can encapsulate the battery module 1 and the module tray 2, so that it is sealed and waterproof during use, and ensures the normal charge and discharge functions of the battery pack.

In terms of the overall shape, the case 3 may be provided as a circular, oval or geometric case 3, specifically according to the shape of the battery module 1, and in this embodiment, the case 3 is provided as a rectangular case 3 to match the rectangular battery module 1.

In this embodiment, the box 3 includes upper cover 31 and lower box 3, and wherein, lower box 3 has openly, and upper cover 31 lid locate openly and form with lower box 3 cooperation and hold the chamber, battery module 1 and module tray 2 all set up in holding the chamber, and the exhaust gap is located between the diapire of module tray 2 and lower box 3, exhaust passage 341 set up in lower box 3.

Above-mentioned setting, battery module 1 and module tray 2 are placed in lower box 3 through the uncovered, and it is sealed uncovered in order to install battery module 1 and module tray 2 integration in holding the intracavity to utilize upper cover 31, exhaust through the exhaust clearance between the diapire of module tray 2 and lower box 3 and discharge to outside through the exhaust channel 341 on the lower box 3.

Specifically, the upper cover 31 and the lower case 3 are rectangular, and the size of the upper cover 31 is matched with the size of the opening, so that the upper cover 31 is matched with the opening to cover the opening, thereby realizing the sealing of the opening.

In this embodiment, the upper cover 31 includes a fixed cover 311 and an access cover 312, wherein the fixed cover 311 is disposed at an opening of the lower case 3, the fixed cover 311 is provided with an access opening 3111, and the access cover 312 is detachably connected to the access opening 3111. Through setting up upper cover 31 into fixed lid 311 and access cover 312 two parts, when the battery package needs to be overhauld, can realize the maintenance operation through dismantling access cover 312 and opening access port 3111, need not to carry out the dismouting to upper cover 31 is whole, convenient to use.

Specifically, the fixed cover 311 is a rectangular cover, and is mounted at an opening of the rectangle in a matching manner. The shape and the size of access cover 312 and access port 3111 are matched, in this embodiment, access port 3111 is a rectangular port, access cover 312 is a rectangle, and access cover 312 can be installed at access port 3111 in a threaded connection or clamping manner.

Further, the lower case 3 includes a support frame 32 and a bottom guard 33, wherein the top of the support frame 32 is connected to the upper cover 31, the bottom guard 33 is connected to the bottom of the support frame 32, the upper cover 31, the support frame 32 and the bottom guard 33 cooperate to form a receiving chamber, an exhaust gap is formed between the bottom guard 33 and the module tray 2, and an exhaust passage 341 is provided in the support frame 32.

The lower box body 3 is arranged in the form of the supporting frame 32 and the bottom guard plate 33, the supporting frame 32 plays a role in supporting and reinforcing the connection of the upper cover 31 and the bottom guard plate 33, the integral matched structural strength and rigidity of the upper cover 31, the supporting frame 32 and the bottom guard plate 33 are ensured, and the exhaust channel 341 is arranged on the supporting frame 32.

As shown in fig. 1, 8 and 10, in the present embodiment, the side of the support frame 32 facing the accommodating chamber is provided as a stepped structure 34, and the first channel 3411, the second channel 3412 and the third channel 3413 are provided in the stepped structure 34.

Specifically, the step structure 34 is a step-shaped cavity, and the step-shaped cavity is formed by the first channel 3411, the second channel 3412, and the third channel 3413.

Specifically, the supporting frame 32 may be a rectangular frame formed by enclosing the cross beam 321 and the longitudinal beam 322, and a plurality of middle cross beams 323 are disposed at intervals inside the rectangular frame, and the plurality of middle cross beams 323 divide the accommodating cavity into a plurality of accommodating areas, so that the plurality of battery modules 1 are installed in the plurality of accommodating areas in a one-to-one correspondence.

In this embodiment, the step structure 34 is disposed along the cross beam 321 and the longitudinal beam 322, the pressure relief opening 34131 is disposed on the cross beam 321 and/or the longitudinal beam 322 and is communicated with the third channel 3413 in the step structure 34, and two ends of the middle cross beam 323 are lapped on the step structure 34 to realize installation and fixation.

Meanwhile, as shown in fig. 2, 3,4 and 6, the mounting holes 23 on the module tray 2 include a first mounting hole 231 for connecting with the middle beam 323 and a second mounting hole 232 for connecting with the bottom guard plate 33, and the module tray 2 can be connected and fixed with the middle beam 323 and the bottom guard plate 33 by passing through the first mounting hole 231 and the middle beam 323 and passing through the second mounting hole 232 and the bottom guard plate 33 through fasteners such as bolts or screws.

Specifically, the edge of the module tray 2 is overlapped with the bottom surface of the step structure 34, and the edge of the module tray 2 can be bolted or welded with the bottom surface of the step structure 34.

Of course, in other embodiments, the module tray 2 may be directly welded to the bottom guard 33 and the middle beam 323, and the module tray 2 and the lower case 3 may be connected and fixed.

In this embodiment, the bottom guard 33 is made of HC340/590DP high-strength steel or more, or a heat-formed steel.

In this embodiment, the structural strength of the bottom protection plate 33 is inversely proportional to the structural strength of the module tray 2, for example, when the module tray 2 is set to be a thicker single layer or to be a double-layer structure of the upper plate 21 and the lower plate 22, the structural strength thereof is larger, and the support to the battery module 1 can be satisfied, the bottom protection plate 33 is set to be a thin plate at this time, and when the module tray 2 is set to be a thinner single-layer structure, the structural strength thereof is smaller, and the bottom protection plate 33 is set to be a thick plate at this time, so as to enhance the support to the module tray 2.

In this embodiment, as shown in fig. 2, 3 and 9, the lower case 3 further includes a reinforcing beam 35, and the reinforcing beam 35 is connected to the support frame 32. The reinforcement beam 35 can further enhance the structural strength of the support frame 32, thereby enhancing the structural strength of the lower case 3 as a whole.

Specifically, the stiffening beam 35 includes a beam body 351, a first stiffener 352 and a second stiffener 353, where the beam body 351 is fixedly connected to the outer wall of the support frame 32, the first stiffener 352 is inclined, and a lower end of the first stiffener 352 is connected to the beam body 351, a higher end of the first stiffener 352 is connected to the outer wall of the support frame 32, the second stiffener 353 is inclined, and a higher end of the second stiffener 353 is connected to the beam body 351, and a lower end of the second stiffener 353 is connected to the outer wall of the support frame 32.

The above-mentioned setting, the roof beam body 351 carries out the structural reinforcement to the outer wall of braced frame 32, and first strengthening rib 352, second strengthening rib 353 slope set up simultaneously to support simultaneously the upside and the downside of braced frame 32's outer wall respectively through first strengthening rib 352, second strengthening rib 353, in order to transmit braced frame 32's atress to roof beam body 351, thereby reduce braced frame 32's deformation or rupture condition.

In particular, the beam body 351 is preferably provided as a hollow beam, such as an H-beam, a U-beam, or a hollow rectangular beam, to reduce the weight of the structure while securing the structural strength.

The first reinforcing rib 352 is obliquely arranged on the upper surface of the beam body 351, and the lower end of the first reinforcing rib 352 and the upper surface of the beam body 351, the higher end of the first reinforcing rib 352 and the outer wall of the supporting frame 32 can be welded and fixed to ensure the connection strength of the first reinforcing rib 352, the lower end of the beam body 351 and the outer wall of the supporting frame 32.

The second reinforcing rib 353 is obliquely arranged in the beam body 351, and the higher end of the second reinforcing rib 353 and the inner wall of the beam body 351, and the lower end of the second reinforcing rib 353 and the outer wall of the support frame 32 can be welded and fixed to ensure the connection strength of the three.

In some embodiments, the first and second reinforcing ribs 352 and 353 may be provided as a rib plate to increase the connection area with the support frame 32 and the beam body 351;

In other embodiments, the first stiffener 352 and the second stiffener 353 may also be configured as ribs to reduce material and cost.

For a specific setting position, in this embodiment, the stringers 322 on two sides of the support frame 32 are provided with reinforcement beams 35 to structurally reinforce the stringers 322, and the pressure relief opening 34131 may be disposed on the cross beam 321 of the support frame 32, so that the pressure relief opening 34131 and the reinforcement beams 35 are staggered on the support frame 32 and do not interfere with each other.

In this embodiment, the beam body 351 is internally provided with intersecting cross ribs 354. The cross ribs 354 are arranged in the beam body 351 to strengthen the structural strength of the beam body 351, so that the structural strength of the whole lower box body 3 is improved.

The cross ribs 354 may be transverse and vertical ribs perpendicular to each other, which are welded to the inner wall of the beam body 351.

In addition, as shown in fig. 11, the battery pack of the present embodiment further includes a support member 4, where the support member 4 is disposed in the case 3 and below the module tray 2. The support piece 4 supports the module tray 2, improves the deformation resistance of the module tray 2, and reduces the deformation collapse risk of the module tray 2.

It should be noted that, the support member 4 should avoid the exhaust hole 221, so as to avoid affecting the normal exhaust of the exhaust hole 221.

Preferably, the support 4 is an elastic support structure. The elastic supporting structure has certain elastic energy absorption and buffering functions, and can effectively absorb impact force when the bottom guard plate 33 receives external impact force, so that the battery module 1 and the explosion-proof valve are protected, and the whole battery pack is safely protected.

In terms of a specific structure, the elastic supporting structure can be designed into a solid shrapnel structure or a honeycomb structure and the like, and has good bottom impact resistance and energy absorption functions.

For specific materials, the elastic support 4 may be in structures such as MPP (polypropylene microporous foam) square microporous foam and PP (polypropylene) sandwich, and when the battery pack is out of control, the elastic support 4 may deform vertically, i.e. the vertical exhaust space (i.e. the exhaust gap) between the module tray 2 and the bottom guard plate 33 is increased.

For concrete connection, the support piece 4, the bottom guard plate 33 and the module tray 2 can be glued or partially glued on two sides to form a sandwich structure, so that the structure has higher rigidity and a cavity buffering and energy absorbing function, and the rigidity of the whole structure at the bottom of the battery module 1 is improved.

For realizing the cooling to battery module 1 to in time cool off to battery package heat dissipation, this battery package still includes cooling structure 5, and cooling structure 5 sets up in the both sides of battery module 1, in order to cool off the both sides of battery module 1 simultaneously, alleviates the battery package condition of generating heat.

Optionally, the cooling structure 5 may be a liquid cooling plate, and the liquid cooling plate is used to cool and provide support for the two sides of the battery cell of the battery module 1. Specifically, the liquid cooling plate can be adhered and fixed with the two side electric cores through the adhesive, and the adhesive can provide heat conduction and connection effects.

In order to facilitate understanding of the battery pack of the present embodiment, the following description will be made on the installation process and the exhaust process thereof:

The installation of the battery pack, the module tray 2 connects the supporting piece 4 with the module tray 2 and the bottom guard plate 33 to form a sandwich structure whole, an exhaust gap is reserved between the module tray 2 and the bottom guard plate 33, the exhaust gap is communicated with the exhaust hole 221 and an exhaust channel 341 of the supporting frame 32, the module tray 2 can be fixedly connected with the supporting frame 32 and the bottom guard plate 33 through bolts or welding, the battery module 1 is placed on the module tray 2, an explosion-proof valve at the bottom of the battery module 1 corresponds to the exhaust hole 221 of the module tray 2, and the upper cover 31 is covered at the opening of the lower box body 3 to realize the sealing of the battery pack;

When the battery pack needs to be overhauled, the overhauling cover plate is disassembled to open the overhauling hole 3111 of the upper cover 31, the maintenance and inspection operation can be carried out on the interior of the battery pack through the overhauling hole 3111, and the battery pack can be sealed by reinstalling the overhauling cover plate in the overhauling hole 3111 after the overhauling is finished;

When the battery pack is in thermal runaway, the explosion-proof valve of the battery module 1 is opened, gas in the battery core is discharged to an exhaust gap through the explosion-proof valve and the exhaust hole 221, the exhaust gap can store and buffer the gas, then the gas in the exhaust gap enters the first channel 3411 and the second channel 3412 through the exhaust inlet 34121, the gas in the first channel 3411 flows into the second channel 3412 and flows into the third channel 3413 together with the gas in the second channel 3412, and then is discharged to the outside of the battery pack through the pressure relief port 34131.

It is to be understood that the battery pack of the present embodiment may be applied to power equipment such as vehicles, ships, airplanes, etc., and the present embodiment is not particularly limited.

Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.

Claims (10)

1. A battery pack, comprising:

the battery module is provided with an explosion-proof valve;

The module tray is positioned at the bottom of the battery module and is provided with an exhaust hole, and the exhaust hole and the explosion-proof valve are correspondingly arranged;

the battery module is characterized by comprising a box body, wherein an exhaust channel communicated with the outside is arranged, the battery module and the module tray are arranged in the box body, an exhaust gap is formed between the module tray and the bottom wall of the box body, and the exhaust channel is communicated with the exhaust hole through the exhaust gap.

2. The battery pack according to claim 1, wherein the exhaust passage includes a first passage, a second passage, and a third passage that are in a stepped and low-to-high arrangement, the first passage and the second passage being in communication, the second passage and the third passage being in communication, at least one of the first passage, the second passage, and the third passage being in communication with the exhaust gap, at least one of the first passage, the second passage, and the third passage being in communication with the outside.

3. The battery pack according to claim 2, wherein the case includes:

an upper cover;

The lower box body is provided with an opening, the upper cover is arranged on the opening and matched with the lower box body to form a containing cavity, the battery module and the module tray are arranged in the containing cavity, the exhaust gap is arranged between the module tray and the bottom wall of the lower box body, and the exhaust channel is arranged in the lower box body.

4. The battery pack of claim 3, wherein the lower case comprises:

the top of the supporting frame is connected with the upper cover;

The bottom guard board is connected with the bottom of the supporting frame, the upper cover, the supporting frame and the bottom guard board are matched to form the accommodating cavity, the exhaust gap is formed between the bottom guard board and the module tray, and the exhaust channel is arranged on the supporting frame.

5. The battery pack of claim 4, wherein the lower case further comprises a reinforcement beam, the reinforcement beam being coupled to the support frame.

6. The battery pack of claim 5, wherein the reinforcement beam comprises:

the beam body is fixedly connected with the outer wall of the supporting frame;

The first reinforcing ribs are obliquely arranged, one lower end of each first reinforcing rib is connected with the beam body, and one higher end of each first reinforcing rib is connected with the outer wall of the supporting frame;

The second strengthening rib, slope setting, just the higher one end of second strengthening rib with the roof beam body links to each other, the lower one end of second strengthening rib with braced frame's outer wall links to each other.

7. The battery pack of claim 6, wherein the beam body is internally provided with intersecting cross bars.

8. The battery pack according to any one of claims 1 to 7, wherein the module tray includes an upper plate and a lower plate connected to each other, the upper plate is in contact with the bottom of the battery module, the lower plate is connected to the case, and the upper plate and the lower plate are each provided with the vent hole that is conductive.

9. The battery pack according to any one of claims 1 to 7, wherein the module tray is further provided with a mounting table adapted to mount an electrical component;

And/or, the module tray is also provided with a mounting hole which is convenient to connect with the box body;

and/or, the battery pack further comprises a supporting piece, wherein the supporting piece is arranged in the box body and positioned below the module tray.

10. The battery pack of claim 9, wherein the support is a resilient support structure.