CN215680882U

CN215680882U - Battery pack

Info

Publication number: CN215680882U
Application number: CN202121338860.8U
Authority: CN
Inventors: 张男; 易梓琦; 吴祖钰; 张万财
Original assignee: Xiamen Haichen New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2022-01-28
Anticipated expiration: 2031-06-16

Abstract

The application provides a battery pack, and relates to the technical field of batteries. The battery pack comprises a box body and at least one battery module; each single battery of the battery module is provided with a first explosion-proof valve, the battery module comprises a fireproof protective cover, the fireproof protective cover is provided with a drainage part, and the drainage part is provided with a first through hole corresponding to the first explosion-proof valve; the battery module is fixed in the box body, the box body is provided with an air cavity, and the box body is provided with a third through hole which is arranged corresponding to the first through hole and is used for guiding air flow generated when the first explosion-proof valve is exploded to the air cavity; the heat insulation piece is arranged between the box body and the fireproof protective cover and comprises a heat insulation body and a blasting body used for blocking gas backflow of the gas cavity, and the blasting body is arranged corresponding to the first through hole. The probability that the whole battery pack is out of control and is on fire can be reduced.

Description

Battery pack

Technical Field

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

Background

In order to improve safety of a battery module, an explosion-proof valve is generally installed on a single battery, and although the method can prevent the corresponding single battery from exploding due to excessive pressure, when the explosion-proof valve of the single battery is exploded, high-temperature air flow sprayed out of the explosion-proof valve can be randomly diffused and scattered to other parts of the battery module or adjacent battery modules, and the whole battery pack is easily subjected to thermal runaway fire.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a battery pack, which can reduce the probability of fire caused by thermal runaway of the whole battery pack, reduce the number of parts and the cost, and ensure that the structure has enough strength.

The embodiment of the application is realized as follows:

the embodiment of the application provides a battery pack, which comprises a box body and at least one battery module;

each single battery of the battery module is provided with a first explosion-proof valve, the battery module comprises a fireproof protective cover, the fireproof protective cover is provided with a drainage part, and the drainage part is provided with a first through hole corresponding to the first explosion-proof valve;

the battery module is fixed in the box body, the box body is provided with an air cavity, and the box body is provided with a third through hole which is arranged corresponding to the first through hole and is used for guiding air flow generated when the first explosion-proof valve is exploded to the air cavity;

the heat insulation piece is arranged between the box body and the fireproof protective cover and comprises a heat insulation body and a blasting body used for blocking gas backflow of the gas cavity, and the blasting body is arranged corresponding to the first through hole.

In the above technical scheme, since the drainage portion of the fireproof protection cover has the first through hole corresponding to the first explosion-proof valve, the box body has the third through hole corresponding to the first through hole, the blasting body is arranged corresponding to the first through hole, and then when the first explosion-proof valve is exploded, under the impact force of the high-temperature airflow, the blasting body is separated from the heat insulation body, so that the high-temperature airflow flows into the air cavity from the first through hole through the third through hole. Because the heat insulating part sets up between box and fire prevention visor, then the high temperature air current in the air cavity is difficult to diffuse other battery module under the effect of stopping of blasting body to can improve the safety of other battery modules, reduce the probability that whole battery package thermal runaway was on fire. In addition, in this application embodiment, the air cavity sets up at the box, has avoided adding spare part in addition alone and has set up drainage channel, and the battery package of this application embodiment can reduce spare part quantity reduce cost, and also can guarantee that the structure has sufficient intensity.

In a possible embodiment, the blasting body comprises a connection portion connected to the insulating body, and the thickness of the connection portion is smaller than the thickness of the insulating body.

In the technical scheme, because the thickness of the connecting part is smaller than that of the heat insulation body, when the first explosion-proof valve is exploded, the explosion body is easy to separate from the heat insulation body under the impact force of high-temperature airflow.

In one possible embodiment, the burst body portion is connected to the insulating body.

In one possible embodiment, the box body comprises a plurality of protection plates, edge beams and spacing pieces, the edge beams and the spacing pieces are fixed on the protection plates, the two edge beams surround an installation space for installing the plurality of battery modules, the spacing pieces are distributed in the installation space at intervals and divide the installation space into a plurality of sub-installation chambers, and each battery module is arranged in one of the sub-installation chambers; the heat insulation piece is arranged between the spacing piece and the fireproof protection cover;

the spacer is internally provided with a first accommodating cavity, the spacer is provided with a third through hole, and the third through hole is communicated with the first accommodating cavity and is used for guiding the gas passing through the first through hole into the first accommodating cavity; the inside second that has of boundary beam holds the chamber, and the second holds the chamber and holds the chamber intercommunication with first.

In the above technical solution, the spacer divides the installation space into a plurality of sub-installation chambers, and each battery module is disposed in one of the sub-installation chambers, so that two adjacent battery modules are separated. When first explosion-proof valve explodes, explode the body and break away from the back with thermal-insulated body, the third through-hole can be with the gas drainage through first through-hole to the first intracavity that holds, then flow into the second from the first chamber that holds and hold the chamber. The high-temperature airflow flows in the first accommodating cavity of the spacer and the second accommodating cavity of the edge beam and cannot diffuse randomly, so that the probability of thermal runaway and fire of the whole battery pack can be reduced.

In one possible embodiment, the material of the thermal insulation is mica.

In above-mentioned technical scheme, mica has better high temperature resistance, therefore when first explosion-proof valve explodes, can avoid the thermal-insulated piece to catch fire and initiate battery package thermal runaway well.

In a possible embodiment, the projection of the first through hole in the thermal insulation element is located entirely on the blasting body.

In the technical scheme, when the first explosion-proof valve is exploded, under the impact force of high-temperature airflow, the explosion body is separated from the heat insulation body, so that the high-temperature airflow enters the air cavity from the third through hole.

In one possible embodiment, the insulating body is fixed to the edge beam.

In a possible implementation scheme, the spacer comprises cross beams and longitudinal beams, the cross beams are arranged in an array mode, first accommodating cavities are formed in the cross beams, the longitudinal beams are arranged between the adjacent cross beams in the same transverse direction to separate the two first accommodating cavities, and third through holes are formed in the cross beams.

In the technical scheme, the longitudinal beams can separate the two first accommodating cavities of the adjacent cross beams in the same transverse direction. When the first explosion-proof valve explodes, high-temperature airflow can be prevented from being directly sprayed to the adjacent battery modules, and therefore the probability that the whole battery pack is out of thermal control to catch fire can be further reduced.

In a possible embodiment, the edge beam comprises a transverse edge beam and a longitudinal edge beam which are connected, the transverse edge beam is internally provided with a first cavity, the longitudinal edge beam is internally provided with a second cavity, and the first cavity and the second cavity are communicated and form a second accommodating cavity.

In the technical scheme, the first cavity of the transverse boundary beam and the second cavity of the longitudinal boundary beam can both pass through high-temperature air flow, the area of the air cavity is large, and more air flow can be contained, so that the safety of the battery pack can be further improved.

In a possible embodiment, the tank is equipped with at least one second explosion-proof valve, the air inlet of which communicates with the air chamber.

In the above technical scheme, since the at least one second explosion-proof valve is installed on the box body, and the air inlet of the second explosion-proof valve is communicated with the air cavity, when the pressure of the high-temperature air flow flowing into the air cavity is too high, the second explosion-proof valve can be exploded and sprayed to the outside so as to further improve the safety of the whole battery pack.

In a possible embodiment, the drainage part includes a first folded part extending along an edge of the first through hole to a side near the first explosion-proof valve.

In the technical scheme, because first folding portion extends to one side that is close to first explosion-proof valve along the edge of first through-hole, when then the first explosion-proof valve of battery module explodes, spun high temperature air current can flow to first through-hole under the water conservancy diversion effect of first folding portion, sets up first folding portion and can prevent spun high temperature air current from diffusing at will better.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

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

FIG. 2 is a schematic structural diagram of a protective fire protection cover according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a module header according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a battery pack according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a battery pack in a first viewing angle according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a case according to an embodiment of the present application;

fig. 7 is a sectional view of a battery pack according to an embodiment of the present application;

FIG. 8 is a schematic structural view of a stringer according to an embodiment of the present application;

FIG. 9 is a cross-sectional view of a stringer according to an embodiment of the present application;

FIG. 10 is a schematic structural view of a beam according to an embodiment of the present application;

FIG. 11 is a cross-sectional view of a beam of an embodiment of the present application;

fig. 12 is a schematic structural view of an insulation member according to an embodiment of the present application.

Icon: 100-a battery pack; 10-a battery module; 101-a first explosion-proof valve; 11-a fireproof protective cover; 111-a drainage portion; 111 a-a first via; 111 b-a first fold over; 112-a first mounting portion; 1121 — first mounting hole; 113-a second mounting hole; 12-a flexible circuit board; 121-a second via; 123-connector; 13-module end plates; 131-a first threaded hole; 132-a recess; 133-a mounting bracket; 1331-a first mounting cavity; 1332-a second mounting cavity; 134-first coupling nut; 135-fourth mounting hole; 14-die set pulling plate; 141-a second fold over; 142-a third fold; 143-third mounting holes; 15-leading out a connecting sheet; 20-protective plate; 301-a stringer; 3011-a first cavity; 302-longitudinal edge beam; 3021-a second cavity; 3022-a third cavity; 3023-fourth threaded hole; 3024-fifth via; 31-a sub-installation chamber; 32-a second receiving chamber; 33-a second explosion-proof valve; 40-a spacer; 41-a cross beam; 411-a first receiving chamber; 412-a third via; 413-a third receiving chamber; 414-third threaded hole; 42-longitudinal beams; 50-a thermal insulation; 51-a thermally insulating body; 52-blasting the body.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," "fourth," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The embodiment of the present application also provides a battery pack 100, which includes a case and at least one battery module 10. One or more battery modules 10 may be provided.

The battery module 10 includes a battery pack including at least one unit cell, each unit cell being provided with a first explosion-proof valve 101, and a fireproof protection cover 11. Referring to fig. 1 and 2, the fire protection cover 11 is provided with a drainage portion 111, and the drainage portion 111 has a first through hole 111a corresponding to the first explosion-proof valve 101.

Referring to fig. 4 to 7, the battery module 10 is fixed in a case, the case is provided with an air cavity, and the case is provided with a third through hole 412 corresponding to the first through hole 111a for guiding the air flow generated when the first explosion-proof valve 101 is exploded to the air cavity.

A heat insulating member 50 (see fig. 12) is provided between the fire-proof protection cover 11 and the box body, the heat insulating member 50 includes a heat insulating body 51 and a blasting body 52 for blocking the gas backflow of the gas chamber, and the blasting body 52 is provided corresponding to the first through hole 111 a.

Because the drainage part 111 of the fireproof protection cover 11 has the first through hole 111a corresponding to the first explosion-proof valve 101, the box body has the third through hole 412 corresponding to the first through hole 111a, and the blasting body 52 is arranged corresponding to the first through hole 111a, when the first explosion-proof valve 101 is exploded, under the impact force of the high-temperature airflow, because the thickness of the connecting part is smaller than that of the heat insulation body 51, the blasting body 52 is separated from the heat insulation body 51, so that the high-temperature airflow flows into the air cavity from the first through hole 111a through the third through hole 412. Because the heat insulation piece 50 is arranged between the box body and the fireproof protection cover 11, high-temperature airflow in the air cavity is not easy to diffuse to other battery modules 10 under the blocking effect of the blasting body 52, so that the safety of other battery modules 10 can be improved, and the probability of the whole battery pack 100 being out of thermal control and firing is reduced. In addition, in this application embodiment, the air cavity sets up at the box, has avoided adding spare part in addition alone and has set up drainage channel, and the battery package 100 of this application embodiment can reduce spare part quantity reduce cost, and also can guarantee that the structure has sufficient intensity.

In a possible embodiment, the bursting body 52 comprises a connecting portion connected to the insulating body 51, and the thickness of the connecting portion is smaller than the thickness of the insulating body 51.

When the first explosion-proof valve 101 is exploded, the explosion body 52 is relatively easily separated from the heat insulation body 51 due to the thickness of the connection part being smaller than that of the heat insulation body 51 under the impact force of the high-temperature gas flow.

The blasting body 52 may be partially connected to the heat insulating body 51, or may be entirely connected to the heat insulating body. When the exploding body 52 is partially connected to the heat insulating body 51, the connecting portion of the exploding body 52 is connected to the heat insulating body 51, and the other portion is not connected to the heat insulating body 51. When the blasting body 52 is entirely connected to the thermal insulation body 51, the thickness of the blasting body 52 is smaller than that of the thermal insulation body 51.

It is understood that the heat insulator 50 may be a unitary structure, and the exploding body 52 is cut at a position corresponding to the heat insulator 50 such that the connection portion of the exploding body 52 is connected with the heat insulator 51. Of course, the blasting body 52 and the heat insulating body 51 may be separately manufactured and then connected.

Illustratively, the projection of the first through hole 111a on the thermal insulation 50 is entirely located on the blasting body 52.

When the first explosion-proof valve 101 is exploded, under the impact force of the high-temperature airflow, the explosion body 52 is separated from the heat insulation body 51, so that the high-temperature airflow enters the air cavity from the third through hole 412, and because the projection of the first through hole on the heat insulation member 50 is completely located on the explosion body 52, the high-temperature airflow generated when the first explosion-proof valve 101 is exploded can be ejected from the position where the explosion body 52 is separated as far as possible to flow into the air cavity, thereby reducing the probability that the high-temperature airflow is ejected to other parts of the battery module 10.

Illustratively, the material of the thermal insulation member 50 is mica. Mica has good high temperature resistance, so when the first explosion-proof valve 101 bursts, the thermal runaway of the battery pack 100 caused by the fire of the heat insulation member 50 can be well avoided. The heat insulation member 50 may be a mica board or mica paper.

In addition, the heat insulation body 51 may be connected to the box or the fireproof protection cover 11. For example, the connection manner of the heat insulation body 51 and the box body or the fire protection cover 11 is bonding, screw connection, rivet connection, or snap connection, and the connection manner is not particularly limited in the embodiment of the present application.

Further, the box body is provided with a second explosion-proof valve 33, and an air inlet of the second explosion-proof valve 33 is communicated with the air cavity. The second explosion-proof valve 33 is burst open to the outside to further improve the safety of the entire battery pack 100 when the pressure of the high-temperature air flow flowing into the air chamber is excessive.

Optionally, the drainage part 111 further includes a first folded part 111b, and the first folded part 111b extends along an edge of the first through hole 111a to a side near the first explosion-proof valve 101. When the first explosion-proof valve 101 of the battery module 10 bursts, the ejected high-temperature air flow can flow to the first through hole 111a under the guiding action of the first folded part 111b, and the first folded part 111b can better prevent the ejected high-temperature air flow from being randomly diffused.

Illustratively, the fireproof protection cover 11 is obtained by forming a mica plate by adhering and laminating multiple layers of mica paper and glue or epoxy resin, and then performing hot press molding. The main material of the fireproof protection cover 11 is mica, and the mica has a good high temperature resistance characteristic, so that the fireproof protection cover 11 can be prevented from being ignited when the first explosion-proof valve 101 is exploded. In other embodiments, the fireproof protection cover 11 may also be made of a high temperature resistant metal material.

Alternatively, the projection of the first explosion-proof valve 101 on the fire protection cover 11 is entirely located in the first through hole 111 a. Under this kind of mode of setting, the high temperature air current that produces when first explosion-proof valve 101 explodes can follow first through-hole 111a blowout as far as possible, has reduced the probability of high temperature air current flow direction to other spare parts of battery module 10, and then has reduced battery module 10 and has taken place the probability of many times thermal runaway.

Referring to fig. 1 and 3, a battery module 10 includes a housing, a battery pack disposed in the housing, the housing including two opposite module pull plates 14 and two opposite module end plates 13, the module pull plates 14 connected to the module end plates 13, a flexible circuit board 12 disposed on one side of the battery pack, and a fireproof protection cover 11 disposed on one side of the flexible circuit board 12.

The module end plate 13 has a first threaded hole 131, the two opposite ends of the fireproof protection cover 11 have first mounting portions 112, the first mounting portions 112 are provided with first mounting holes 1121 (refer to fig. 2) corresponding to the first threaded holes 131, and the fireproof protection cover 11 can be fixed to the module end plate 13 by passing screws or bolts through the first mounting holes 1121 and the first threaded holes 131 and being in threaded connection with the first threaded holes 131.

The opposite ends of the module pulling plate 14 are provided with second folding parts 141, the second folding parts 141 are lapped on the cover plate of the battery pack, and the flexible circuit board 12 is arranged on the cover plate of the battery pack. The second folded portion 141 limits the displacement of the battery pack in the height direction of the battery post, and also plays a role in improving the strength of the module pulling plate 14.

The second folded part 141 has a second threaded hole, the fireproof protection cover 11 has a second mounting hole 113 corresponding to the second threaded hole, and the fireproof protection cover 11 can be fixed to the module pulling plate 14 by passing a screw or a bolt through the second mounting hole 113 and the second threaded hole and in threaded fit with the second threaded hole. In other embodiments, a nut may also be welded on the module pulling plate 14, and then the module pulling plate 14 is correspondingly provided with a mounting hole, and the fireproof protection cover 11 may be fixed on the module pulling plate 14 by passing a screw or a bolt through the second mounting hole 113 and connecting with the nut through a thread.

Illustratively, the module end plate 13 is provided with a recess 132, the opposite ends of the module pulling plate 14 are provided with third folded portions 142, the third folded portions 142 and the second folded portions 141 are disposed at the adjacent two sides of the module pulling plate 14, and the third folded portions 142 are overlapped on the recess 132 of the module end plate 13 and connected by laser welding or a screw and rivet process to complete the tensioning of the battery module 10.

Optionally, the module end plate 13 is machined from an aluminum alloy extrusion. Illustratively, the module end plate 13 is mounted with a mounting bracket 133, the mounting bracket 133 has a first mounting cavity 1331, the flexible circuit board 12 has a connector 123, the first mounting cavity 1331 has a T-shaped structure and has a wide portion and a narrow portion, the connector 123 is disposed at the narrow portion of the first mounting cavity 1331, and the main structure portion of the flexible circuit board 12 is disposed at the wide portion of the first mounting cavity 1331. The battery module 10 has a lead-out connecting piece 15, the mounting bracket 133 has a second mounting cavity 1332 for accommodating the lead-out connecting piece 15, the lead-out connecting piece 15 is accommodated in the second mounting cavity 1332, a first connecting nut 134 is fixed in the second mounting cavity 1332, the lead-out connecting piece 15 is penetrated through by a bolt and is in threaded connection with the first connecting nut 134, and the lead-out connecting piece 15 can be fixed on the mounting bracket 133.

Further, referring to fig. 1, the flexible circuit board 12 has a second through hole 121, the first explosion-proof valve 101 is located in the second through hole 121, and the projection of the second through hole 121 on the fireproof protection cover 11 is located in the first through hole 111 a.

Since the first explosion-proof valve 101 is located in the second through-hole 121, when the first explosion-proof valve 101 explodes, high-temperature air flows from the second through-hole 121 to the first through-hole 111 a. Because the projection of the second through hole 121 on the fireproof protection cover 11 is completely located in the first through hole 111a, the high-temperature airflow ejected from the second through hole 121 can be ejected from the first through hole 111a basically, so that the probability that the high-temperature airflow flows to other parts of the battery module 10 can be reduced more effectively, and further, the probability that the battery module 10 is subjected to multiple thermal runaway is reduced.

In one possible embodiment, the battery modules 10 are provided in plurality, the case includes a protection plate 20, edge beams and spacers 40, the edge beams and the spacers 40 are fixed to the protection plate 20, the edge beams enclose an installation space provided to install the plurality of battery modules 10, the spacers 40 are spaced apart and distributed in the installation space and partition the installation space into a plurality of sub-installation chambers 31, and each battery module 10 is provided in one of the sub-installation chambers 31.

For example, the module pulling plate 14 further includes a third mounting hole 143, the module end plate 13 includes a fourth mounting hole 135 (see fig. 1 and 3) provided corresponding to the third mounting hole 143, and the battery module 10 can be fixed to the case by inserting a first connecting bolt into the third mounting hole 143 and the fourth mounting hole 135 and connecting the first connecting bolt to the case.

The spacer 40 is internally provided with a first accommodating cavity 411, the spacer 40 is provided with a third through hole 412, and the third through hole 412 is communicated with the first accommodating cavity 411 and is used for guiding the gas passing through the first through hole 111a into the first accommodating cavity 411; the inside of the side sill is provided with a second accommodating cavity 32, and the second accommodating cavity 32 is communicated with the first accommodating cavity 411.

The spacers 40 partition the mounting space into the sub-mounting chambers 31, and each of the battery modules 10 is disposed in one of the sub-mounting chambers 31, so that adjacent two of the battery modules 10 are partitioned. Because the third through hole 412 is arranged corresponding to the first through hole 111a, the third through hole 412 can guide the gas passing through the first through hole 111a into the first accommodating cavity 411, and the second accommodating cavity 32 is communicated with the first accommodating cavity 411, so when the first explosion-proof valve 101 is exploded, when the explosion body 52 is separated from the heat insulation body 51, the ejected high-temperature gas flow enters the first accommodating cavity 411 from the first through hole 111a through the third through hole 412, and then flows into the second accommodating cavity 32 from the first accommodating cavity 411. The high-temperature air flows in the first receiving cavity 411 of the spacer 40 and the second receiving cavity 32 of the edge beam without being diffused randomly, so that the possibility of thermal runaway fire of the entire battery pack can be reduced. In addition, the situation that a drainage channel is arranged by additionally adding parts alone is avoided, the number of the parts can be reduced, the cost can be reduced, and the whole structural strength can be ensured.

When the second explosion-proof valve 33 is arranged on the box body, the second explosion-proof valve 33 is arranged on the side beam, and an air inlet of the second explosion-proof valve 33 is communicated with the second accommodating cavity 32. The second explosion-proof valve 33 is burst open to the outside to improve the safety of the entire battery pack 100 when the pressure of the high-temperature air flow flowing into the second receiving chamber 32 is excessive.

Referring to fig. 7-9, in one possible embodiment, the edge beams include a transverse edge beam 301 and a longitudinal edge beam 302 connected to each other, wherein the two transverse edge beams 301 are disposed opposite and parallel to each other, and the two longitudinal edge beams 302 are disposed opposite and parallel to each other. The cross edge beam 301 is internally provided with a first cavity 3011, the longitudinal edge beam 302 is internally provided with a second cavity 3021, and the first cavity 3011 and the second cavity 3021 are communicated to form a second accommodating cavity 32. The first cavity 3011 of the transversal side beam 301 and the second cavity 3021 of the longitudinal side beam 302 can both pass through high-temperature air flow, and the area of the air cavity is large, so that a larger amount of air flow can be accommodated, and the safety of the battery pack can be further improved.

Referring to fig. 7, 10 and 11, the spacer 40 includes cross beams 41 and longitudinal beams 42, the cross beams 41 are arranged in an array, the cross beams 41 have first accommodating cavities 411 therein, the first accommodating cavities 411 are communicated with the second cavity 3021, the cross beams 41 are provided with third through holes 412, and the longitudinal beams 42 are disposed between adjacent cross beams 41 in the same transverse direction to partition the two first accommodating cavities 411. Illustratively, the insulation body 51 is secured to the cross beam 41.

Since the longitudinal beams 42 can block the two first accommodation cavities 411 of the adjacent cross beams 41 in the same transverse direction. When the first explosion-proof valve 101 bursts, high-temperature airflow can be prevented from being directly sprayed to the adjacent battery module 10, so that the probability of the whole battery pack 100 being out of thermal runaway and firing can be further reduced.

Wherein, the both ends of longeron 42 are connected with horizontal limit roof beam 301, and the both ends of crossbeam 41 are connected with longeron 42 and vertical limit roof beam 302 respectively, and first chamber 411 and the second cavity 3021 intercommunication of holding. The longitudinal side beam 302 is provided with a fifth through hole 3024 communicated with the second cavity 3021, and the second cavity 3021 of the longitudinal side beam 302 is communicated with the first accommodating cavity 411 of the cross beam 41 through the fifth through hole 3024.

It should be noted that, when the battery modules 10 are disposed on the two opposite sides of the cross beam 41, two first accommodating cavities 411 that are not communicated with each other are disposed inside each cross beam 41, and third through holes 412 are respectively disposed on the two opposite sides of the cross beam 41, and the two third through holes 412 are respectively disposed corresponding to the first through holes 111a of the two battery modules 10.

Optionally, the cross beam 41 further has a third accommodating cavity 413 therein, a third threaded hole 414 is formed in a region of the cross beam 41 corresponding to the third accommodating cavity 413, and the third threaded hole 414 is in threaded engagement with the third accommodating cavity 413 through a screw or a bolt, and the third accommodating cavity 413 is penetrated through the cross beam and used for fixing other components of the battery pack 100.

Referring to fig. 8 and 9, optionally, a third cavity 3022 is further formed inside the longitudinal side beam 302, the third cavity 3022 is not communicated with the second cavity 3021, a fourth threaded hole 3023 is formed in the position of the longitudinal side beam 302 corresponding to the second cavity 3021, and the longitudinal side beam 302 is screwed with the fourth threaded hole 3023 by a screw or a bolt and is inserted into the third cavity 3022, so that the cover (not shown) of the battery pack 100 can be fixed to the case body.

To sum up, in the battery pack 100 provided in the embodiment of the present application, the fireproof protection cover 11 of the battery module 10 has the drainage portion 111, and when the first explosion-proof valve 101 of the battery module 10 is exploded, under the impact force of the high-temperature airflow, because the thickness of the connection portion is smaller than the thickness of the heat insulation body 51, the explosion body 52 is easier to be separated from the heat insulation body 51, so that the high-temperature airflow flows into the air cavity from the first through hole 111a through the third through hole 412. Because the heat insulation piece 50 is arranged between the box body and the fireproof protection cover 11, high-temperature airflow in the air cavity is not easy to diffuse to other battery modules 10 under the blocking effect of the blasting body 52, so that the safety of other battery modules 10 can be improved, and the probability of the whole battery pack 100 being out of thermal control and firing is reduced. In addition, in this application embodiment, the air cavity sets up at the box, has avoided adding spare part in addition alone and has set up drainage channel, and the battery package 100 of this application embodiment can reduce spare part quantity reduce cost, and also can guarantee that the structure has sufficient intensity. Further, when the pressure of the high-temperature air flowing into the air chamber is excessive, the second explosion-proof valve 33 may burst open to be sprayed to the outside to improve the safety of the entire battery pack 100. The high-temperature air flows all flow in the specific channels and cannot diffuse randomly, so that the probability of the whole battery pack 100 from being out of control and firing due to heat can be reduced.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack is characterized by comprising a box body and at least one battery module;

the battery module is fixed in the box body, the box body is provided with an air cavity, the box body is provided with a third through hole which is arranged corresponding to the first through hole and is used for guiding airflow generated when the first explosion-proof valve is exploded to the air cavity;

and a heat insulation piece is arranged between the box body and the fireproof protective cover, the heat insulation piece comprises a heat insulation body and a blasting body for blocking the gas backflow of the gas cavity, and the blasting body is arranged corresponding to the first through hole.

2. The battery pack of claim 1, wherein the burst body comprises a connection portion connected to the thermally insulated body, and wherein the connection portion has a thickness less than a thickness of the thermally insulated body.

3. The battery pack of claim 2, wherein the burst body portion is connected to the thermally insulated body.

4. The battery pack according to any one of claims 1 to 3, wherein a plurality of battery modules are provided, the case includes a protection plate, a boundary beam, and spacers, the boundary beam and the spacers are fixed to the protection plate, the boundary beam encloses an installation space in which a plurality of battery modules are installed, the spacers are spaced apart in the installation space and partition the installation space into a plurality of sub-installation chambers, and each battery module is provided in one of the sub-installation chambers; the thermal insulation piece is arranged between the spacing piece and the fireproof protection cover;

a first containing cavity is formed in the spacer, the spacer is provided with a third through hole, and the third through hole is communicated with the first containing cavity and is used for guiding the gas passing through the first through hole to the first containing cavity; the inside second that has of boundary beam holds the chamber, the second hold the chamber with first chamber intercommunication that holds.

5. The battery pack of claim 4, wherein the projection of the first through hole on the thermal insulation member is entirely located on the burst body.

6. The battery pack of claim 4, wherein the thermally insulating body is secured to the side beams.

7. The battery pack according to claim 4, wherein the spacers include cross beams and longitudinal beams, the cross beams are arranged in an array, the first accommodating cavities are formed in the cross beams, the longitudinal beams are arranged between the adjacent cross beams in the same transverse direction to partition the two first accommodating cavities, and the cross beams are provided with the third through holes.

8. The battery pack of claim 4, wherein the side beams comprise a cross side beam and a longitudinal side beam which are connected, the cross side beam is internally provided with a first cavity, the longitudinal side beam is internally provided with a second cavity, and the first cavity and the second cavity are communicated and form a second accommodating cavity.

9. The battery pack according to any one of claims 1 to 3, wherein the case is provided with at least one second explosion-proof valve, and an air inlet of the second explosion-proof valve is communicated with the air chamber.

10. The battery pack according to any one of claims 1 to 3, wherein the drain part includes a first folded part extending along an edge of the first through hole to a side near the first explosion-proof valve.