CN220628118U - Battery pack - Google Patents

Abstract

The application discloses a battery pack relates to power battery technical field. The battery pack comprises a plurality of electric cores and an exhaust assembly, wherein each electric core is provided with an explosion-proof valve; the exhaust assembly includes a guide and a cooling matrix; at least one accommodating cavity is arranged in the guide piece, each accommodating cavity extends along the first direction, and the cooling matrix is filled in the accommodating cavity; the outer side wall of each accommodating cavity is correspondingly provided with a through groove, the through groove extends along the first direction and is arranged, the guide piece is reversely buckled on the surface of the battery cell where the explosion-proof valve is located, the through groove and the battery cell are enclosed to form an exhaust channel, and the exhaust channel is used for guiding the battery cell during exhaust. The battery pack provided by the application, when the electric core of the battery pack is in thermal failure, high-temperature and high-pressure gas generated in the electric core can be discharged under the guiding action of the exhaust channel, and the high-temperature and high-pressure gas can be effectively prevented from directly rushing to the top cover of the battery pack, so that the design requirement of the top cover is reduced.

Description

Battery pack

Technical Field

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

Background

The power battery pack is a power supply for providing a power source for the new energy automobile. The power battery pack is used as a new energy product with wider application. In the field of power batteries of new energy automobiles, in order to balance the pressure inside and outside a battery pack, an exhaust channel is generally arranged in the power battery pack to exhaust gas generated inside the power battery pack, so that the use safety is ensured.

In the related art, the exhaust assembly of the power battery pack is provided with two flame retardant layers, the nearest flame retardant layer of top cover of the power battery pack is provided with exhaust holes, after the electric core in the power battery pack is out of control, high-temperature and high-pressure gas is sprayed from the exhaust holes at the top of the flame retardant layers for exhaust, in the process, the high-temperature and high-pressure gas is easy to act on the top cover of the power battery pack, and thermal shock is caused to the top cover, so that the top cover is melted, and further, the design requirement of the upper cover is required to be improved. Therefore, providing a battery pack that can reduce the requirements of the top cover and is not prone to thermal shock to the top cover is a problem that needs to be solved currently.

Disclosure of Invention

In view of this, the present application aims to provide a battery pack, and aims to solve the technical problem that in the prior art, an exhaust component is easy to impact a top cover after the thermal runaway of an electric core inside the power battery pack.

In order to achieve the above purpose, the technical scheme adopted in the application is as follows:

the embodiment of the application provides a battery pack, which comprises:

the battery cells are provided with explosion-proof valves;

the exhaust assembly comprises a guide piece and a cooling matrix, wherein at least one accommodating cavity is arranged in the guide piece, the cooling matrix is filled in the accommodating cavities, each accommodating cavity extends along a first direction, a through groove is correspondingly formed in the outer side wall of each accommodating cavity, the through groove extends along the first direction, the guide piece is reversely buckled on the surface of a battery cell where the explosion-proof valve is located, an exhaust channel is formed by encircling the through groove and the battery cell, and the exhaust channel is used for guiding the battery cell during exhaust.

The battery pack that this application embodiment provided, exhaust assembly include guide and cooling matrix to form logical groove at the lateral wall of guide, simultaneously, be equipped with at least one in the guide and hold the chamber, and fill cooling matrix in holding the chamber, the guide back-off is in the electric core surface at explosion-proof valve place, by logical groove with electric core encloses and closes and form the exhaust passage. In this way, after the high-temperature high-pressure gas generated by the thermal runaway of the battery core is sprayed out from the explosion-proof valve, the high-temperature high-pressure gas is firstly flushed to the through groove of the exhaust assembly, and is discharged under the guiding action of the exhaust channel after being blocked by the wall body of the through groove, so that the high-temperature high-pressure gas can be effectively prevented from being directly flushed to the top cover of the battery pack, the design requirement of the top cover is reduced, and meanwhile, the temperature of the high-temperature high-pressure gas is effectively reduced due to the action of the accommodating cavity and the cooling matrix; if the high-temperature high-pressure gas impacts and melts the wall body of the guide piece, which faces the battery cell, the cooling matrix is directly poured to the battery cell with thermal runaway so as to cool the battery cell, and the generation amount of the high-temperature high-pressure gas is reduced.

In one embodiment of the present application, the through slot has a bottom wall;

the bottom wall is provided with a thinning part, the thinning part is positioned above the battery cell, and the thickness of the thinning part is smaller than the thickness of other parts of the bottom wall, so that the gas discharged by the battery cell in thermal runaway can be melted through the thinning part, and the cooling matrix flows out and is poured to the battery cell.

In one embodiment of the present application, a plurality of thinned portions are provided, and each thinned portion corresponds to an explosion-proof valve of one of the battery cells.

In one embodiment of the present application, the thickness of the thinned portion is D, and the thickness of other parts of the bottom wall of the through groove is D, which satisfies the following relation: d is more than or equal to 1 mu m and less than or equal to 4 mu m, and D is more than or equal to 0.6 and less than or equal to 0.9D.

In one embodiment of the present application, the guide member has the first direction and a second direction perpendicular to the first direction, the number of the accommodating chambers is one, and the number of the through grooves is one;

or alternatively, the first and second heat exchangers may be,

the guide piece is provided with a first direction and a second direction perpendicular to the first direction, the number of the accommodating cavities and the number of the through grooves are more than two, a plurality of the accommodating cavities are distributed at intervals along the second direction, and a plurality of the through grooves are distributed at intervals along the second direction.

In one embodiment of the present application, the guide member is further provided with a hollowed portion, and the hollowed portion extends along the first direction.

In one embodiment of the present application, a through hole is formed in a wall body between the hollow portion and the through groove, and the hollow portion is communicated with the through groove through the through hole.

In one embodiment of the present application, the exhaust assembly further comprises a first seal;

an opening is formed in the guide piece and used for communicating the accommodating cavity with the outside, and the first sealing piece is used for sealing the opening.

In one embodiment of the present application, the first seal is integrally formed with the guide;

or alternatively, the first and second heat exchangers may be,

the first seal member is detachably connected with the guide member.

In one embodiment of the present application, the exhaust assembly further includes a plurality of second sealing members, each of the second sealing members avoiding the through groove and being connected with a surface of the guide member where the through groove is provided.

In one embodiment of the present application, the guide member is made of aluminum or an aluminum alloy.

In one embodiment of the present application, the battery pack further includes:

the battery pack comprises a box body, wherein an installation cavity is formed in the box body, an exhaust port is formed in the box body, and a plurality of battery cells are accommodated in the installation cavity in at least one row;

and the exhaust valve is arranged at the exhaust port.

In one embodiment of the present application, the battery pack further includes a plurality of mounting brackets disposed in the mounting cavity, and the guide is connected with the mounting brackets.

In one embodiment of the present application, along the extending direction of the through groove, the distance between two adjacent mounting brackets is L, and satisfies the relationship: l is more than 0 and less than or equal to 500mm;

and/or the number of the groups of groups,

the box is equipped with a plurality of the gas vent, the gas vent is arranged in the circumference lateral wall of box, every the gas vent corresponds and is provided with one the discharge valve.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 illustrates a schematic perspective view of an exhaust assembly in one embodiment of the present application;

FIG. 2 illustrates a schematic view of a view of the exhaust assembly of FIG. 1;

FIG. 3 illustrates another schematic view of the exhaust assembly of FIG. 1;

FIG. 4 shows a cross-sectional view of section A-A of FIG. 3;

FIG. 5 illustrates an exploded view of the exhaust assembly of FIG. 1;

FIG. 6 is an enlarged schematic view of the portion D of FIG. 5;

FIG. 7 illustrates a schematic view of a view of an exhaust assembly according to another embodiment of the present application;

FIG. 8 is a schematic view showing a view of a battery pack according to an embodiment of the present application;

FIG. 9 shows a cross-sectional view of section B-B of FIG. 8;

FIG. 10 is an enlarged schematic view of the portion C of FIG. 9;

fig. 11 is a schematic view showing an exploded structure of the battery pack of fig. 8;

FIG. 12 illustrates a schematic diagram of thermal runaway venting of a battery cell within a battery pack in some embodiments of the present application;

FIG. 13 is a schematic perspective view of the top cover of FIG. 11;

FIG. 14 is a schematic view of the top cover of FIG. 13 from a perspective;

FIG. 15 is a schematic view showing a view of a battery pack with a vent valve removed in one embodiment of the present application;

FIG. 16 illustrates a schematic view of an assembly structure of a lower housing, a mounting bracket, and an exhaust assembly in one embodiment of the present application;

FIG. 17 illustrates a schematic view of a guide in one embodiment of the present application;

FIG. 18 is a schematic view of a guide in another embodiment of the present application;

fig. 19 shows a schematic view of a guide in accordance with yet another embodiment of the present application.

Description of main reference numerals:

100-an exhaust assembly; 110-a guide; 111-a receiving cavity; 1111-opening; 112-through slots; 1121-a bottom wall; 11211-a thinned portion; 1122-a first sidewall body; 1123-a second sidewall body; 113-a hollowed-out part; 120-a first seal; 130-a second seal; 140-cooling the substrate; 200-battery pack; 210-a battery module; 211-an electric core; 2111-explosion-proof valve; 212-an exhaust passage; 220-a box body; 2201-a first airflow channel; 2202-second gas flow channel; 2203-exhaust port; 2204-mounting cavity; 221-top cover; 2211—a first side plate; 2212—a second side plate; 2213—a third side plate; 2214-a fourth side panel; 2215-roof; 222-lower box; 2221-mounting groove; 2222-mounting bracket; 2223-crossbeam; 223-sealing ring; 230-exhaust valve.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

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

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

As shown in fig. 1, 9 and 10, embodiments of the present application provide a battery pack 200, and the battery pack 200 may be used on an electric vehicle, or other electrical device.

As shown in connection with fig. 3, 4, 5, and 11, the battery pack 200 includes a plurality of cells 211 and a vent assembly 100, each cell 211 having an explosion-proof valve 2111, the vent assembly 100 including a guide 110 and a cooling matrix 140; at least one receiving cavity 111 is provided in the guide 110, each receiving cavity 111 extends in the first direction, and the cooling medium 140 is filled in the receiving cavity 111; the outer side wall of each accommodating cavity 111 is correspondingly formed with a through groove 112, the through grooves 112 extend along the first direction, meanwhile, the guide piece 110 is reversely buckled on the surface of the battery cell 211 where the explosion-proof valve 2111 is located, the through grooves 112 and the battery cell 211 are enclosed to form an exhaust channel 212, and the exhaust channel 212 is used for guiding the battery cell 211 during exhaust.

It should be noted that, in conjunction with fig. 3, for convenience of description of the various embodiments, the first direction is the length direction of the guide 110, and the second direction is the width direction of the guide 110. Illustratively, the plurality of cells 211 may be arranged in an array-like distribution, such as a row of multiple columns or a plurality of rows of multiple columns.

It is understood that the cooling matrix 140 may be composed of ethylene glycol and water in a volume ratio of 1:1, and of course, the cooling matrix 140 may be other solutions with cooling function.

According to the battery pack 200 provided by the embodiment, the guide member 110 is reversely buckled on the surface of the battery core 211 where the explosion-proof valve 2111 is located, the through groove 112 and the battery core 211 are surrounded to form the exhaust channel 212, after the high-temperature and high-pressure gas generated after the battery core 211 is in thermal runaway is sprayed out of the explosion-proof valve 2111, the high-temperature and high-pressure gas is firstly flushed towards the through groove 112 of the exhaust assembly 100, and is discharged along the first direction through the exhaust channel 212 after being blocked by the wall body of the through groove 112, so that the high-temperature and high-pressure can be effectively prevented from being directly flushed towards the top cover 221 of the battery pack 200, the design requirement of the top cover 221 is reduced, and therefore, the top cover of the battery pack in the related art is replaced by adopting a high-temperature resistant special material to be replaced by a common material, and the thick material is replaced by a thin material, so that the weight reduction and the cost reduction are realized, and the market competitiveness of the battery pack 200 is improved. Meanwhile, due to the effects of the accommodating chamber 111 and the cooling matrix 140, the temperature of the high-temperature and high-pressure gas is effectively reduced; if the high temperature and high pressure gas impacts the wall of the melting guide 110 facing the cell, the cooling matrix 140 is directly poured to the thermal runaway cell 211 to cool the cell 211, thereby reducing the generation amount of the high temperature and high pressure gas and preventing the high temperature and high pressure gas from spreading in a large amount.

As shown in fig. 5 and 6, in one embodiment, the through groove 112 has a bottom wall 1121, a thinned portion 11211 is provided on the bottom wall 1121, the thinned portion 11211 has a thickness smaller than that of other portions of the bottom wall 1121, the thinned portion 11211 is located above the battery cell 211, and the thinned portion 11211 is used for gas to melt through the thinned portion 11211 when the battery cell 211 is exhausted in thermal runaway, so that the cooling medium 140 flows out and is poured onto the battery cell 211.

In this embodiment, by providing the thinning portion 11211 on the bottom wall 1121 of the through slot 112, and making the thickness D of the thinning portion 11211 smaller than the thickness D of other portions of the bottom wall 1121, when the high-temperature and high-pressure gas generated by the thermal runaway of the battery cell 211 acts on the thinning portion 11211, the high-temperature and high-pressure gas melts and penetrates the thinning portion 11211, at this time, the cooling medium 140 in the accommodating cavity 111 flows out and can be directly poured onto the battery cell 211 below the guide member 110 under the action of gravity, so as to cool down the thermal runaway battery cell 211, reduce the influence on other battery cells 211 around the thermal runaway battery cell 211, and prevent heat from spreading. In addition, the thickness D of the other portion of the bottom wall 1121 is made larger than the thickness D of the thinned portion 11211, so that the bottom wall 1121 is provided with the thinned portion 11211 and the overall structural strength of the bottom wall 1121 can be ensured, thereby ensuring the structural strength of the guide 110.

As shown in fig. 4, in the embodiment in which the bottom wall 1121 of the through-groove 112 has the thinned portion 11211, further, the thickness of the thinned portion 11211 is D, and the thickness of the other portion of the bottom wall 1121 of the through-groove 112 is D, which satisfies the relationship: d is more than or equal to 1 mu m (micrometer) and less than or equal to 4 mu m, and D is more than or equal to 0.6D and less than or equal to 0.9D. In this embodiment, the thickness of the thinned portion 11211 can be reduced by finishing, laser or etching to reduce the thickness of a certain proportion of the material on the bottom wall 1121 of the through-slot 112 to form the thinned portion 11211. Illustratively, the thickness D of the bottom wall 1121 of the through groove 112 is 4 μm, and the thickness D of the thinned portion 11211 is 2.4 μm.ltoreq.d.ltoreq.3.6 μm, and preferably the thickness D of the thinned portion 11211 is 3 μm. Of course, in other embodiments, if the thickness D of the bottom wall 1121 of the through groove 112 is 1 μm, the thickness D of the thinned portion 11211 is 0.6 μm and D is 0.9 μm, and the thickness D of the thinned portion 11211 may be selected from 0.6 μm, 0.7 μm, 0.8 μm, and 0.9 μm. For another example, the thickness D of the bottom wall 1121 of the through groove 112 is 3 μm, and the thickness D of the thinned portion 11211 is 1.8 μm or less and D or less than 2.7 μm, and the thickness D of the thinned portion 11211 may be 1.8 μm, 1.9 μm, 2 μm, 2.5 μm, or 2.7 μm.

As shown in fig. 5, in the embodiment in which the bottom wall 1121 of the through-groove 112 has the thinned portions 11211, a plurality of thinned portions 11211 are provided, and a plurality of thinned portions 11211 in the same through-groove 112 are provided at intervals in the first direction in the through-groove 112, each thinned portion 11211 corresponding to the explosion-proof valve 2111 of one cell 211. In this way, when thermal runaway occurs in one cell 211, the high-temperature and high-pressure gas generated from the explosion-proof valve 2111 of the cell 211 melts and penetrates the thinned portion 11211, and at this time, the cooling medium 140 in the accommodating chamber 111 directly flows downward by gravity and is poured onto the explosion-proof valve 2111 of the cell 211, so as to cool down the cell 211, and prevent heat from spreading to affect other cells 211 around the cell 211.

As shown in fig. 2, in one embodiment, the number of the accommodating chambers 111 is one, and the number of the through grooves 112 is one. That is, one through groove 112 corresponds to one accommodation chamber 111. Illustratively, the plurality of cells 211 are arranged in a row along the first direction, and at this time, the guide member 110 is reversely fastened to the plurality of cells 211 in the row, and the through groove 112 is used for guiding the gas generated by the thermal runaway of the cells 211 in the row. That is, one guide 110 is mounted on a plurality of cells 211 located in a row, so that an exhaust passage 212 is defined by the guide 110 and the plurality of cells 211 in the same row.

As shown in fig. 7, in the implementation different from the above-described one accommodation chamber 111 and one through groove 112, the number of the accommodation chambers 111 and the through grooves 112 is two or more, the plurality of accommodation chambers 111 are arranged at intervals along the second direction, and the plurality of through grooves 112 are arranged at intervals along the second direction. Thus, one guide 110 may be used for exhaust guiding of multiple rows of cells 211. Illustratively, the plurality of cells 211 are arranged in a row along a first direction and a plurality of rows of cells 211 are arranged along a second direction. In this way, the guide member 110 is reversely buckled on the multiple rows of the battery cells 211, and a row of battery cells 211 is corresponding to the lower part of each through slot 112, so as to guide the exhaust of each row of battery cells 211.

As shown in fig. 2 and 17, in one embodiment, the guide member 110 is further provided with a hollow portion 113, and the hollow portion extends along the first direction. The hollowed-out portion 113 reduces the weight of the guide 110, thereby reducing the weight of the battery pack 200. Alternatively, the hollowed-out portions 113 are disposed at opposite sides of the accommodating chamber 111.

As shown in fig. 17, in one embodiment of the hollow portion 113, the hollow portion 113 is disposed side by side with the accommodating cavity 111, and at this time, the wall body of the through groove 112 is located below the hollow portion 113 and the accommodating cavity 111.

As shown in fig. 6, in one embodiment, the through groove 112 has a first side wall body 1122 and a second side wall body 1123, the first side wall body 1122 and the second side wall body 1123 are respectively connected to the bottom wall 1121 and located at opposite ends of the bottom wall 1121, and the first side wall body 1122 and the second side wall body 1123 are disposed opposite to each other.

In another embodiment of the above-mentioned hollowed-out portion 113, as shown in fig. 18, the first side wall 1122 and the second side wall 1123 are respectively provided with hollowed-out portions 113, and each hollowed-out portion 113 is extended along the first direction. In this embodiment, the hollowed portions 113 are provided on the first side wall 1122 and the second side wall 1123, respectively, so that the hollowed portions 113 reduce the weight of the first side wall 1122 and the second side wall 1123, which can reduce the weight of the guide 110, thereby facilitating the weight reduction of the battery pack 200.

As shown in fig. 6 and 19, in still another embodiment of the above-mentioned hollow portion 113, further, the first side wall 1122 and the second side wall 1123 are respectively provided with the hollow portion 113, and at the same time, the guide 110 is also provided with the hollow portion 113 above the first side wall 1122 and the second side wall 1123, the hollow portion 113 of the first side wall 1122 is communicated with the hollow portion 113 of the first side wall 1122, and the hollow portion 113 of the second side wall 1123 is communicated with the hollow portion 113 of the second side wall 1123. In this way, the hollowed-out portion 113 not only reduces the weight of the first side wall 1122 and the second side wall 1123, but also reduces the weight of the guide 110 on both sides of the accommodating cavity 111, further reduces the overall weight of the guide 110, and further reduces the weight of the battery pack 200.

In the embodiment where the first side wall 1122 and the second side wall 1123 have the hollow portion 113, further, a through hole (not shown in the figure) is formed in a wall between the hollow portion 113 and the through groove 112, and the hollow portion 113 is in communication with the through groove 112 through the through hole. In this embodiment, the hollow portion 113 is communicated with the through groove 112 by the through hole, so that when the battery cell 211 is exhausted in thermal runaway, the gas can enter the hollow portion 113 through the through hole, and compared with the condition of only the through groove 112, the guiding exhaust flow of the through groove 112 is increased, the gas can be conveniently discharged out quickly, and the heat dissipation efficiency is improved.

As shown in FIG. 2, in one embodiment, the exhaust assembly 100 further includes a first seal 120. The guide 110 is provided with an opening 1111, the opening 1111 is for communicating the receiving chamber 111 with the outside, and the first sealing member 120 is for sealing the opening 1111. Specifically, the cooling medium 140 is poured into the opening 1111 of the accommodating chamber 111 to be filled into the accommodating chamber 111, and then the opening 1111 is sealed by the first sealing member 120, so that the cooling medium 140 is prevented from flowing out of the opening 1111, the opening 1111 is arranged to facilitate the filling of the cooling medium 140 into the accommodating chamber 111, and the opening 1111 is sealed by the first sealing member 120.

In the embodiment of the exhaust assembly 100 having the first sealing member 120, the first sealing member 120 is optionally integrally formed with the guide member 110, for example, the first sealing member 120 is a cut piece cut on the guide member 110, one side of the cut piece is not cut from the guide member 110, the remaining side of the cut piece is cut and separated from the guide member 110, and then the cut piece is bent to form the opening 1111, and the cut piece is welded and sealed after the cooling substrate 140 is filled into the receiving cavity 111 from the opening 1111.

Of course, in other embodiments, the first seal 120 and the guide 110 may alternatively be connected in other ways, such as by removably connecting the first seal 120 to the guide 110. Illustratively, the first seal 120 is attached at the opening 1111 of the guide 110 by a screw. Alternatively, the first sealing member 120 is sealed at the opening 1111 of the receiving chamber 111 by a welding process for blocking the opening 1111. Of course, the first sealing member 120 is not limited to sealing the opening 1111 by a welding process, and the first sealing member 120 may also seal the opening 1111 by other connection methods, such as an adhesive process, which will not be described herein.

As shown in fig. 5 and 10, in one embodiment, the exhaust assembly 100 further includes a second seal 130. The second sealing members 130 are provided in plurality, and each of the second sealing members 130 is kept away from the through groove 112 and is connected with the surface of the guide member 110 provided with the through groove 112. The side of the second sealing member 130 away from the guide member 110 is connected to the upper surface of the battery cell 211, that is, the second sealing member 130 is located between the guide member 110 and the battery cell 211, so that the second sealing member 130 plays a role in elastic buffering in addition to the sealing function between the through groove 112 and the upper surface of the battery cell 211.

It should be noted that, the surfaces of the second sealing member 130 and the through groove 112 may be fixed by welding, bonding or screwing.

Illustratively, the second sealing member 130 is made of sealing foam, which can limit and buffer the battery cell 211 in the height direction thereof, prevent the battery cell 211 from vibrating in the height direction thereof, and improve the stability of the battery pack 200. In this embodiment, the compression ratio of the sealing foam is preferably 50%. Of course, the second sealing member 130 is not limited to use of sealing foam, and in other embodiments, the second sealing member 130 may be made of other materials having a sealing effect and a certain elastic effect.

In any of the above embodiments, the material of the guide 110 is aluminum or an aluminum alloy. In this embodiment, the guide member 110 is made of an aluminum alloy material, so that when high-temperature and high-pressure gas impacts the guide member 110, the high-strength aluminum alloy can effectively resist the impact of the gas, which is beneficial to improving the impact resistance. Of course, the material of the guide 110 is not limited thereto, and the guide 110 may be made of an aluminum material, but of course, the guide 110 may be made of other metal materials having corrosion resistance or nonmetallic materials having high structural strength.

As shown in fig. 8, in one embodiment, the battery pack 200 further includes a case 220, an exhaust valve 230, and a battery module 210.

Referring to fig. 9, a mounting cavity 2204 is provided in the case 220, an exhaust port 2203 is provided in the case 220, the exhaust valve 230 is mounted on the exhaust port 2203, and the plurality of battery cells 211 are accommodated in at least one row in the mounting cavity 2204. In some embodiments, the plurality of battery cells 211 form the battery module 210, and the battery module 210 may be formed by a plurality of rows of battery cells 211 or a plurality of rows of battery cells 211. The guide piece 110 of the exhaust assembly 100 is reversely buckled on the surface of the battery cell 211 where the explosion-proof valve 2111 is located, and the through groove 112 and the battery cell 211 are enclosed to form an exhaust channel 212.

In this embodiment, after the high-temperature and high-pressure gas generated after the thermal runaway of the battery core 211 is ejected from the explosion-proof valve 2111, the high-temperature and high-pressure gas is first flushed towards the through groove 112 of the exhaust assembly 100, and is then discharged along the first direction through the exhaust channel 212 after being blocked by the wall body of the through groove 112, so as to be discharged from the exhaust valve 230 of the exhaust port 2203 to the space outside the box 220, thereby preventing the high-temperature and high-pressure gas from directly thermally shocking the top cover 221 of the battery pack 200, reducing the possibility of failure of the top cover 221 and further reducing the design requirements of the top cover 221. Meanwhile, due to the effects of the accommodating chamber 111 and the cooling matrix 140, the temperature of the high-temperature and high-pressure gas is effectively reduced; if the high-temperature and high-pressure gas impacts the wall of the melting guide 110 facing the cell direction, the cooling matrix 140 is directly poured onto the thermal runaway cell 211 to cool the cell 211, thereby reducing the generation amount of the high-temperature and high-pressure gas and preventing the high-temperature and high-pressure gas from spreading in a large amount.

As shown in fig. 11, in one embodiment, the battery pack 200 further includes a plurality of mounting brackets 2222, the mounting brackets 2222 being disposed in the mounting cavity 2204, the guide 110 being coupled to the mounting brackets 2222. In this embodiment, the guide 110 is fixed in the case 220 by a mounting bracket 2222. The guide 110 is fixed to the mounting bracket 2222 by screws, for example, so that the guide 110 is fixed to the case 220, and the guide 110 is prevented from being separated from the upper surface of the cell 211 by thermal shock of gas when the cell 211 is exhausted by the mounting bracket 2222.

In addition, in the embodiment in which the guide member 110 has the second sealing member 130, when the guide member 110 is screwed to the mounting bracket 2222, the second sealing member 130 abuts against the surface of the through groove 112 and the upper surface of the battery cell 211, and the second sealing member 130 plays a role in elastic buffering. At this time, the adjacent two second seals 130, the through grooves 112, and the upper surfaces of the battery cells 211 form the exhaust passage 212.

As shown in fig. 16, in one embodiment, along the extending direction of the through groove 112, a distance between two adjacent mounting brackets 2222 is L, which satisfies the relationship: l is more than 0 and less than or equal to 500mm. In this embodiment, the distance L between two adjacent mounting brackets 2222 is not greater than 500mm, so that the distance between two mounting brackets 2222 is reduced, thereby reducing the distance between the portions of the guide member 110 fixed between two mounting brackets 2222 along the first direction, which is beneficial to improving the impact resistance of the guide member 110, preventing the guide member 110 from being deformed by gas thermal shock or separating from the mounting brackets 2222, thereby improving the impact resistance of the exhaust assembly 100, and further improving the reliability of the battery pack 200.

As shown in fig. 14 and 15, in one embodiment, the case 220 is provided with a plurality of exhaust ports 2203, the exhaust ports 2203 are disposed on a circumferential side wall of the case 220, and each exhaust port 2203 is provided with one exhaust valve 230. In this embodiment, a plurality of exhaust ports 2203 are disposed along the circumferential side wall of the case 220, and the exhaust valve 230 is installed at each exhaust port 2203, so that when the high-temperature and high-pressure gas generated by thermal runaway of the battery cell 211 is ejected from the explosion-proof valve 2111, the high-temperature and high-pressure gas is exhausted in the first direction through the exhaust channel 212, and then is exhausted from the corresponding exhaust valve 230 to the external space of the case 220 through each exhaust port 2203, that is, the gas is exhausted from the circumferential direction of the case 220, the gas is prevented from impacting the top of the case 220, that is, the top cover 221 of the case 220, the possibility of failure of the top cover 221 is reduced, and the design requirement of the top cover 221 is reduced.

As shown in fig. 11, in one embodiment, the case 220 includes a lower case 222 and a top cover 221.

A mounting slot 2221 is provided in the lower housing 222, and the top cover 221 is coupled to the lower housing 222 and defines a mounting cavity 2204. Illustratively, the sealing ring 223 is disposed between the top cover 221 and the lower case 222 to ensure tightness, specifically, the sealing ring 223 is adhered to the mounting surface of the lower case 222, and the top cover 221 compresses the sealing ring 223 and forms a sealing connection with the lower case 222 through bolt fastening. The mounting bracket 2222 is disposed on the slot edge of the mounting slot 2221, the guide member 110 is connected with the mounting bracket 2222, the top cover 221 is abutted against the guide member 110 toward one side surface of the body, and after the high-temperature and high-pressure gas generated after the thermal runaway of the battery cell 211 is ejected from the explosion-proof valve 2111, the high-temperature and high-pressure gas is discharged along the first direction through the exhaust channel 212, so that the high-temperature and high-pressure gas is discharged from the exhaust valve 230 of the exhaust port 2203 to the external space of the box 220, and the top cover 221 of the battery pack 200 is prevented from being directly thermally shocked by the high-temperature and high-pressure gas.

It should be noted that, the mounting bracket 2222 may be fixed to the lower case 222 by welding, riveting or fastening with bolts, in this embodiment, the cross beam 2223 is mounted in the mounting groove 2221 of the lower case 222, and the mounting bracket 2222 is fastened to the cross beam 2223 by bolts selectively, so as to fix the same to the lower case 222.

As shown in fig. 13 and 14, further, the top cover 221 includes a top plate 2215, a first side plate 2211, a second side plate 2212, a third side plate 2213 and a fourth side plate 2214, the first side plate 2211 and the second side plate 2212 are respectively disposed at two ends of the top plate 2215 along the first direction, and the third side plate 2213 and the fourth side plate 2214 are respectively disposed at two ends of the top plate 2215 along the second direction, and the first direction is perpendicular to the second direction. The top cover 221 is integrally formed with the top plate 2215, the first side plate 2211, the second side plate 2212, the third side plate 2213, and the fourth side plate 2214. Illustratively, exhaust ports 2203 are formed in the first side plate 2211, and exhaust ports 2203 are also formed in the second side plate 2212, and exhaust valves 230 are respectively installed at each exhaust port 2203. In this way, when the battery cell 211 of the battery pack 200 is thermally deactivated, the high-temperature and high-pressure gas generated from the battery cell 211 can be discharged from the peripheral side of the top cover 221 under the guiding action of the exhaust channel 212, so that the high-temperature and high-pressure gas is dispersed to the two sides of the top cover 221 until being discharged from the exhaust port 2203, that is, the high-temperature and high-pressure gas is discharged from the exhaust port 2203 formed in the first side plate 2211 and the exhaust port 2203 formed in the second side plate 2212, so that the high-temperature and high-pressure gas can be effectively prevented from directly rushing to the top plate 2215 of the top cover 221, thereby reducing the design requirements of the top cover 221.

As shown in fig. 12, in the above embodiment, the first air flow passage 2201 and the second air flow passage 2202 are respectively formed in the case 220, the first air flow passage 2201 communicates with the air outlet 2203 provided in the first side plate 2211, and the second air flow passage 2202 communicates with the air outlet 2203 provided in the second side plate 2212. In this embodiment, the high-temperature and high-pressure gas generated by the thermal runaway of the battery cell 211 is evacuated along the exhaust channel 212 to the exhaust port 2203, and is exhausted from the exhaust valve 230, so as to prevent the high-temperature and high-pressure gas from thermally shocking the top cover 221, and reduce the possibility of failure of the top cover 221, thereby reducing the material and structural strength design requirements of the top cover 221.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (12)

1. A battery pack, comprising:

a plurality of cells (211), each cell (211) having an explosion-proof valve (2111);

the exhaust assembly (100) comprises a guide piece (110) and a cooling matrix (140), wherein at least one accommodating cavity (111) is arranged in the guide piece (110), the cooling matrix (140) is filled in the accommodating cavity (111), each accommodating cavity (111) extends along a first direction, a through groove (112) is correspondingly formed in the outer side wall of each accommodating cavity (111), the through groove (112) extends along the first direction, the guide piece (110) is reversely buckled on the surface of a battery cell (211) where an explosion-proof valve (2111) is arranged, an exhaust channel (212) is formed by encircling the through groove (112) and the battery cell (211), and the exhaust channel (212) is used for guiding the battery cell (211) during exhaust.

2. The battery pack according to claim 1, wherein the through-slot (112) has a bottom wall (1121);

the bottom wall (1121) is provided with a thinning part (11211), the thinning part (11211) is positioned above the battery cell (211), the thickness of the thinning part (11211) is smaller than the thickness of other parts of the bottom wall (1121), so that gas discharged in thermal runaway of the battery cell (211) is melted through the thinning part (11211), and the cooling matrix (140) flows out and is poured to the battery cell (211).

3. The battery pack according to claim 2, wherein a plurality of thinned portions (11211) are provided, each thinned portion (11211) corresponding to an explosion-proof valve (2111) of one cell (211).

4. The battery pack according to claim 2, wherein the thickness of the thinned portion (11211) is D, and the thickness of the other portion of the bottom wall (1121) of the through-groove (112) is D, satisfying the relation: d is more than or equal to 1 mu m and less than or equal to 4 mu m, and D is more than or equal to 0.6 and less than or equal to 0.9D.

5. The battery pack according to claim 1, wherein the guide member (110) has a first direction and a second direction perpendicular to the first direction, the number of the receiving chambers (111) is one, and the number of the through grooves (112) is one;

or alternatively, the first and second heat exchangers may be,

the guide member (110) has a first direction and a second direction perpendicular to the first direction, the number of the accommodating chambers (111) and the through grooves (112) is more than two, the accommodating chambers (111) are arranged at intervals along the second direction, and the through grooves (112) are arranged at intervals along the second direction.

6. The battery pack according to any one of claim 1 to 5, wherein,

the guide piece (110) is further provided with a hollowed-out portion (113), and the hollowed-out portion (113) extends along the first direction.

7. The battery pack according to claim 6, wherein a through hole is formed in a wall body between the hollowed-out portion (113) and the through groove (112), and the hollowed-out portion (113) is communicated with the through groove (112) through the through hole.

8. The battery pack according to any one of claims 1 to 5, wherein the vent assembly (100) further comprises a first seal (120);

the guide member (110) is provided with an opening (1111), the opening (1111) is used for communicating the accommodating cavity (111) with the outside, and the first sealing member (120) is used for sealing the opening (1111).

9. The battery pack according to any one of claims 1 to 5, wherein the vent assembly (100) further comprises a second seal (130), the second seal (130) being provided in plurality, each second seal (130) being clear of the open channel (112) and being connected to a surface of the guide (110) provided with the open channel (112).

10. The battery pack according to any one of claims 1 to 5, wherein the battery pack (200) further comprises:

the battery pack comprises a box body (220), wherein an installation cavity (2204) is formed in the box body (220), an exhaust port (2203) is formed in the box body (220), and a plurality of battery cells (211) are accommodated in the installation cavity (2204) in at least one row;

and an exhaust valve (230), wherein the exhaust valve (230) is mounted on the exhaust port (2203).

11. The battery pack of claim 10, wherein the battery pack (200) further comprises a plurality of mounting brackets (2222), the mounting brackets (2222) being disposed in the mounting cavity (2204), the guide member (110) being coupled to the mounting brackets (2222).

12. The battery pack according to claim 11, wherein a distance between two adjacent mounting brackets (2222) along the extending direction of the through groove (112) is L, satisfying the relation: l is more than 0 and less than or equal to 500mm;

and/or the number of the groups of groups,

the box body (220) is provided with a plurality of exhaust ports (2203), the exhaust ports (2203) are arranged on the circumferential side wall of the box body (220), and each exhaust port (2203) is correspondingly provided with an exhaust valve (230).