CN219303872U

CN219303872U - Battery pack upper cover, power battery pack and vehicle

Info

Publication number: CN219303872U
Application number: CN202320209198.9U
Authority: CN
Inventors: 褚磊驰
Original assignee: Xiaomi Automobile Technology Co Ltd
Current assignee: Xiaomi Automobile Technology Co Ltd
Priority date: 2023-02-03
Filing date: 2023-02-03
Publication date: 2023-07-04
Anticipated expiration: 2033-02-03

Abstract

The disclosure relates to a battery pack upper cover, a power battery pack and a vehicle, wherein the battery pack upper cover comprises a first cover plate and a second cover plate; the power battery pack is characterized in that an accommodating groove is formed in the first cover plate, heat insulation colloid is filled in the accommodating groove, the second cover plate is covered on the notch of the accommodating groove and is connected with the heat insulation colloid, one face of the first cover plate faces the second cover plate and is used for being connected with the top of the shell of the power battery pack, and one face of the second cover plate, away from the heat insulation colloid, can be covered on the top of the battery cell of the power battery pack. This battery package upper cover can produce thermal-insulated effect, can the isolated heat, avoids heat transfer to passenger cabin, can avoid influencing driver and passengers' safety.

Description

Battery pack upper cover, power battery pack and vehicle

Technical Field

The disclosure relates to the technical field of power battery packs, in particular to a battery pack upper cover, a power battery pack and a vehicle.

Background

Under the condition that the power battery pack in the related art has thermal runaway, heat can be transmitted to the passenger cabin through the upper cover of the power battery pack, so that the temperature in the passenger cabin is increased, and the safety of drivers and passengers can be endangered.

Disclosure of Invention

An object of the present disclosure is to provide a battery pack upper cover, a power battery pack, and a vehicle to solve the problems in the related art described above.

In order to achieve the above object, an aspect of the present disclosure provides a battery pack upper cover including a first cover plate and a second cover plate;

the power battery pack is characterized in that an accommodating groove is formed in the first cover plate, heat insulation colloid is filled in the accommodating groove, the second cover plate is covered on the notch of the accommodating groove and is connected with the heat insulation colloid, one face of the first cover plate faces the second cover plate and is used for being connected with the top of the shell of the power battery pack, and one face of the second cover plate, away from the heat insulation colloid, can be covered on the top of the battery cell of the power battery pack.

Optionally, a connecting portion is disposed on the first cover plate, and extends along a circumferential edge of the first cover plate, and the connecting portion is used for connecting with a top of a housing of the power battery pack.

Optionally, the first cover plate is provided with a reinforcing part, the reinforcing part is configured into a strip-shaped structure, and the reinforcing part extends along the length direction of the first cover plate.

Optionally, the reinforcing parts are configured as grooves or protrusions, the number of the reinforcing parts is a plurality, and the reinforcing parts are all arranged at intervals.

Optionally, the second apron is kept away from the both sides of one side of thermal-insulated colloid all are provided with the backstop portion, two backstop portions set up relatively, two backstop portions are followed the length direction of second apron extends, backstop portion sets up to can stop power battery package's side roof beam.

Optionally, the one side that the second apron kept away from thermal-insulated colloid is formed with a plurality of edges the equidistant connecting piece that distributes of length direction of second apron, every the connecting piece is all followed the width direction of second apron extends, every the both ends of connecting piece respectively with two backstop portion are connected, every the connecting piece can be located between every two adjacent electric cores of power battery package and with the structural adhesive connection between every two adjacent electric cores.

Optionally, the heat insulation colloid is constructed as pouring sealant, the thickness of the heat insulation colloid is 4-6mm, the heat conductivity coefficient of the heat insulation colloid is 0.05-0.2W/(m.K), and the fire resistance grade of the heat insulation colloid is UL-V0 grade.

The second aspect of the disclosure further provides a power battery pack, which comprises a housing, a battery cell and the battery pack upper cover, wherein the battery cell is connected in the housing, a first cover plate of the battery pack upper cover is arranged at the top of the housing and is connected with the top of the housing, and a second cover plate is arranged at the battery cell and is connected with the battery cell.

Optionally, two opposite supporting parts are formed on the inner side wall of the shell, and two sides of the second cover plate are respectively connected with the tops of the two supporting parts.

Optionally, the power battery package still includes two side roof beams that set up relatively, two the side roof beam is located two between the supporting part and respectively with two inside walls of the relative setting of casing are connected, every all be provided with exhaust component on the side roof beam, exhaust component sets up to be used for water conservancy diversion flue gas.

A third aspect of the present disclosure also provides a vehicle including the above-described power battery pack.

Above-mentioned technical scheme constitutes the space that holds thermal-insulated colloid jointly through the accommodation groove of first apron and second apron for thermal-insulated colloid is located accommodation groove, thereby and thermal-insulated colloid is located directly over the electric core, and thermal-insulated effect can be produced to the thermal-insulated colloid, thereby when the electric core appears under the circumstances of thermal runaway, and thermal-insulated colloid can insulate heat, avoids heat transfer to passenger cabin, can avoid influencing driver and passengers' safety. The shell can be closed through the top connection of first apron and casing, and the second apron lid is on the electric core simultaneously, can play the fixed effect of strengthening to the electric core. The upper cover of the battery pack has the advantages of simple structural design, heat insulation effect, simple manufacturing process, low manufacturing cost and high durability.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:

fig. 1 is a perspective view of one view of a battery pack top cover of one embodiment of the present disclosure;

fig. 2 is a perspective schematic view of another view of a battery pack top cover of an embodiment of the present disclosure;

FIG. 3 is a schematic perspective view of a first cover of one embodiment of the present disclosure;

FIG. 4 is a schematic perspective view of a second cover of one embodiment of the present disclosure;

FIG. 5 is an enlarged partial schematic view of the position A of FIG. 4 in accordance with one embodiment of the present disclosure;

FIG. 6 is a schematic perspective view of a power cell pack of an embodiment of the present disclosure;

fig. 7 is an exploded schematic view of a power cell pack of one embodiment of the present disclosure.

Description of the reference numerals

1. The heat insulation cover comprises a first cover plate, 2, a second cover plate, 3, a containing groove, 4, heat insulation colloid, 5, a connecting part, 6, a reinforcing part, 7, a stopping part, 8, a connecting piece, 9, a shell, 10, a battery cell, 11, a supporting part, 12, side beams, 13 and an exhaust part.

Detailed Description

Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.

In the present disclosure, unless otherwise indicated, terms of orientation such as "upper, lower, left, right" are used generally in the direction of the drawing figures, and "inner, outer" refer to the inner, outer of the relevant parts. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

In the description of the present disclosure, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, directly connected, indirectly connected through an intermediary, or communicating between two elements. The specific meaning of the terms in this disclosure will be understood by those of ordinary skill in the art as the case may be.

Under the condition that the power battery pack in the related art has thermal runaway, heat can be transmitted to the passenger cabin through the upper cover of the power battery pack, so that the temperature in the passenger cabin is increased, and the safety of drivers and passengers can be endangered. In addition, the upper cover of the current power battery pack is complex in manufacturing process, high in manufacturing cost and poor in durability.

To this end, as shown in fig. 1 to 5, an aspect of the present disclosure provides a battery pack upper cover including a first cover plate 1 and a second cover plate 2.

The first cover plate 1 is provided with an accommodating groove 3, the accommodating groove 3 is internally filled with a heat insulation colloid 4, the second cover plate 2 is covered on a notch of the accommodating groove 3 and is connected with the heat insulation colloid 4, one surface of the first cover plate 1, which faces the second cover plate 2, is used for being connected with the top of the shell 9 of the power battery pack, so that one surface, which is far away from the heat insulation colloid 4, of the second cover plate 2 can be covered on the top of the battery cell 10 of the power battery pack.

Wherein, first apron 1 level sets up, and the bottom surface of first apron 1 sets up accommodation groove 3, and accommodation groove 3 is upwards sunken by first apron 1 and forms, and accommodation groove 3's notch orientation is below.

Wherein, the second apron 2 is located the below of first apron 1, and the level setting of second apron 2, and the notch that the second apron 2 can be with holding recess 3 is closed for insulating colloid 4 is located between first apron 1 and the second apron 2, and insulating colloid 4 bonds with the cell wall and the tank bottom of holding recess 3 of first apron 1, and insulating colloid 4 bonds with the top surface of second apron 2 simultaneously.

The bottom surface of the first cover plate 1 is used for being connected with the top of the shell 9 of the power battery pack, so that the battery pack upper cover is connected to the top of the shell 9 and seals the top of the shell 9. The second cover plate 2 is located in the shell 9, the second cover plate 2 covers the battery cell 10, and the second cover plate 2 can strengthen the battery cell 10 and prevent the battery cell 10 from moving.

Among the above-mentioned technical scheme, constitute the space that holds thermal insulation colloid 4 jointly through the accommodation groove 3 of first apron 1 and second apron 2 for thermal insulation colloid 4 is located accommodation groove 3, thereby thermal insulation colloid 4 is located electric core 10 directly over, and thermal insulation colloid 4 can produce thermal insulation effect, thereby under the circumstances that electric core 10 thermal runaway appears, thermal insulation colloid 4 can insulate heat, avoids heat transfer to passenger cabin, can avoid influencing driver and passenger's safety. The housing 9 can be closed by connecting the first cover plate 1 with the top of the housing 9, and the second cover plate 2 covers the battery cell 10, so that the battery cell 10 can be strengthened and fixed. The upper cover of the battery pack has the advantages of simple structural design, heat insulation effect, simple manufacturing process, low manufacturing cost and high durability.

Alternatively, in one embodiment of the present disclosure, the first cover plate 1 is provided with a connection portion 5, the connection portion 5 is disposed to extend along a circumferential edge of the first cover plate 1, and the connection portion 5 is used for connection with a top of the housing 9 of the power battery pack.

The connection strength can be improved by connecting the connection portion 5 with the top of the housing 9 of the power battery pack, and the sealing performance of the top of the housing 9 can be ensured.

In the present embodiment, the connecting portion 5 is configured as a connecting edge protruding from the first cover plate 1 in a horizontal direction in a direction away from the first cover plate 1, and a bottom surface of the connecting edge can be attached to a circumferential edge of a top of the housing 9. In some examples, the bottom surface of the connecting edge may be welded to the circumferential edge of the top of the housing 9.

In other examples, the connection portion 5 is configured as a connection side protruding from the first cover plate 1 in a horizontal direction in a direction away from the first cover plate 1, and an inner side surface of the connection side is connectable with an outer side wall of the top of the housing 9.

Optionally, the connecting portion 5 may also be a connecting seat, on which a connecting bolt is disposed, and the connecting bolt is connected with the top of the housing 9, and of course, the connecting portion 5 may also be a clamping seat, and the top of the corresponding housing 9 may be provided with a clamping connector, where the clamping connector is matched with the clamping seat in a clamping manner, and is simultaneously fixed by welding.

Alternatively, in one embodiment of the present disclosure, the first cover plate 1 is provided with the reinforcing portion 6, the reinforcing portion 6 is configured in an elongated structure, and the reinforcing portion 6 extends in the length direction of the first cover plate 1.

The strength of the first cover plate 1 can be increased through the reinforcing part 6, so that the situation that the first cover plate 1 is deformed due to pressure is reduced, and the safety of drivers and passengers can be better protected.

In some examples, the reinforcing portion 6 is located at the bottom of the accommodating groove 3, that is, the reinforcing portion 6 is located in the accommodating groove 3, and the reinforcing portion 6 is connected with the heat insulation colloid 4, so that the reinforcing portion 6, the first cover plate 1 and the heat insulation colloid 4 form a whole, the heat insulation effect can be achieved, the strength is high, and the safety of drivers and passengers can be well protected when the power battery pack is out of control. By this arrangement, the top surface of the first cover plate 1 can be made favorable for connection of the vehicle body.

In other examples, the reinforcement 6 is located on the top surface of the first cover plate 1, and the reinforcement 6 is located above the first cover plate 1.

Alternatively, in one embodiment of the present disclosure, the reinforcing portion 6 is configured as a groove or a protrusion, the number of the reinforcing portions 6 is plural, and the plural reinforcing portions 6 are disposed at intervals.

In this embodiment, the reinforcement portion 6 may be a groove, wherein the groove is formed by recessing the bottom of the accommodating groove 3 toward the upper side, and the notch of the groove is oriented toward the lower side. The reinforcing portion 6 may be a protrusion formed so that the bottom of the receiving groove 3 protrudes downward.

In some examples, the plurality of reinforcing portions 6 may be distributed in an array at the bottom of the accommodating recess 3, and of course, the plurality of reinforcing portions 6 may be distributed at equal intervals in the width direction of the first cover plate 1. Of course, the plurality of reinforcing plates may be in other distribution forms.

Optionally, in some examples, the reinforcement portion 6 is a groove, and the notch of the groove is chamfered, so as to reduce the difficulty of the process, and facilitate connection between the heat insulation colloid 4 and the groove.

Alternatively, in another embodiment of the present disclosure, the reinforcement 6 is configured as a reinforcing rib, which may be attached to the top surface of the first cover plate 1 or the bottom of the receiving groove 3. Wherein, the reinforcing rib can include horizontal muscle and indulge the muscle, and horizontal muscle and indulge the muscle and can constitute grid structure.

Optionally, in one embodiment of the present disclosure, the notch of the accommodating groove 3 is provided with a chamfer. Through such a setting, the connection of the second cover plate 2 with the notch of the accommodating groove 3 can be facilitated, and the accommodating groove 3 can restrict the second cover plate 2 from entering into the accommodating groove 3.

Optionally, in one embodiment of the present disclosure, two sides of a side of the second cover plate 2 away from the heat insulation colloid 4 are provided with stop portions 7, the two stop portions 7 are disposed opposite to each other, the two stop portions 7 extend along a length direction of the second cover plate 2, and the stop portions 7 are disposed to be capable of stopping the side beams 12 of the power battery pack.

In this embodiment, the two stop portions 7 are close to the long edges of the two sides of the second cover plate 2, so that the battery cell 10 is located between the two stop portions 7, and the stop portions 7 can stop the side beam 12 of the power battery pack, so that a certain space between the side beam 12 and the battery cell 10 can be ensured, and the side beam 12 can protect the electrodes on the two sides of the battery cell 10, and meanwhile can avoid contact with the electrodes.

It can be appreciated that when the second cover plate 2 covers the battery cell 10, the top of the side beam 12 abuts against the bottom of the stop part 7, so that the side beam 12 is fixed in position.

Optionally, in one embodiment of the present disclosure, a plurality of connecting pieces 8 are formed on a surface of the second cover plate 2 away from the heat insulation colloid 4, wherein the connecting pieces are distributed at equal intervals along the length direction of the second cover plate 2, each connecting piece 8 extends along the width direction of the second cover plate 2, two ends of each connecting piece 8 are respectively connected with two stop parts 7, and each connecting piece 8 can be located between every two adjacent electric cells 10 of the power battery pack and connected with structural adhesive between every two adjacent electric cells 10.

In this embodiment, each connecting piece 8 corresponds to a gap between every two adjacent cells 10, the gap between every two adjacent cells 10 is the same as the extending direction of the corresponding connecting piece 8, and the bottom of each connecting piece 8 can be connected with the structural adhesive between every two adjacent cells 10 after the second cover plate 2 covers the cells 10, so that the cells 10 and the second cover plate 2 are connected into a whole, and the installation and fixing strength of the cells 10 can be increased.

In some examples, the connection member 8 is constructed in a long plate-shaped structure, and the connection member 8 is disposed perpendicular to the second cover plate 2.

Alternatively, in one embodiment of the present disclosure, the insulation colloid 4 is configured as a potting adhesive, the thickness of the insulation colloid 4 is 4-6mm, the thermal conductivity of the insulation colloid 4 is 0.05-0.2W/(m·k), and the fire rating of the insulation colloid 4 is UL-V0. Through the setting, pouring sealant can be conveniently injected in a pouring mode, the construction process is simple, the manufacturing cost is low, and the first cover plate 1 and the second cover plate 2 are connected together in the curing process of the pouring sealant. Meanwhile, the pouring sealant has strong heat insulation capacity, can ensure heat insulation effect, can play a role in damping and compression resistance, and increases the safety of the power battery pack.

It can be understood that the pouring sealant is liquid before solidification, and can be filled into the accommodating groove 3, and the heat insulation colloid 4 is formed after the pouring sealant is solidified.

In some examples, the density of the insulation colloid 4 is 0.6g/cm ³ The thickness of the insulating colloid 4 was 5mm, and the thermal conductivity of the insulating colloid 4 was 0.1W/(mK).

Optionally, in one embodiment of the present disclosure, the second cover plate 2 is a non-porous metal plate, and the first cover plate 1 is also of a non-porous design, so that heat transfer can be avoided, and a heat insulation effect is ensured.

As shown in fig. 6 and 7, the second aspect of the present disclosure further provides a power battery pack, which includes a housing 9, a battery cell 10 and the battery pack upper cover, where the battery cell 10 is connected in the housing 9, the first cover plate 1 of the battery pack upper cover is covered on the top of the housing 9 and connected with the top of the housing 9, and the second cover plate 2 is covered on the battery cell 10 and connected with the battery cell 10.

The number of the battery cells 10 is plural, and the plural battery cells 10 are distributed in the housing 9 in parallel, so that the second cover plate 2 is arranged above the plural battery cells 10.

In some examples, the housing 9 is of a rectangular structure, the housing 9 includes a bottom plate and four side plates, and bottoms of the four side plates are connected with four edges of the bottom plate, respectively, so that a top of the housing 9 is of an open structure, so that the first cover plate 1 can close the top of the housing 9. It will be appreciated that the first cover plate 1 and the second cover plate 2 are likewise rectangular structured plates.

Alternatively, in one embodiment of the present disclosure, the inner sidewall of the housing 9 is formed with two opposite supporting parts 11, and both sides of the second cover plate 2 are respectively connected to the top of the two supporting parts 11.

In this embodiment, the supporting portion 11 can support the second cover plate 2, and the top of the supporting portion 11 is higher than the top of the battery cell 10, so that a certain gap is formed between the second cover plate 2 and the battery cell 10, and extrusion of the battery cell 10 is avoided.

In some examples, two support portions 11 are respectively connected to two opposite inner side walls of the housing 9, and extend in the width direction of the housing 9.

Optionally, in one embodiment of the present disclosure, the power battery pack further includes two oppositely disposed side beams 12, the two side beams 12 are located between the two supporting portions 11 and are respectively connected with two oppositely disposed inner side walls of the housing 9, each side beam 12 is provided with an exhaust component 13, and the exhaust component 13 is configured to be used for guiding the flue gas.

In the present embodiment, the two side beams 12 are located on both sides of the cell 10, respectively, and the electrodes on both sides of the cell 10 can be protected by the two side beams 12. In some examples, both side rails 12 extend along the length of the housing 9.

In addition, the exhaust component 13 on the side beam 12 can guide and collect the smoke generated by thermal runaway and realize the discharge, so that the smoke is prevented from accumulating in the power battery pack, and the smoke is prevented from entering the passenger cabin. It will be appreciated that the power cell pack has an explosion-proof valve through which the smoke can be exhausted, and the exhaust component 13 can communicate with the explosion-proof valve to divert the smoke to the explosion-proof valve.

In some examples, the vent member 13 is configured as a vent channel extending along the length of the side rail 12.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.

In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.

Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims

1. The battery pack upper cover is characterized by comprising a first cover plate and a second cover plate;

2. The battery pack top cover according to claim 1, wherein a connection portion is provided on the first cover plate, the connection portion extending along a circumferential edge of the first cover plate, the connection portion being for connection with a top portion of a housing of the power battery pack.

3. The battery pack top cover according to claim 1, wherein the first cover plate is provided with a reinforcing portion configured in an elongated structure, the reinforcing portion extending in a length direction of the first cover plate.

4. The battery pack cover as claimed in claim 3, wherein the reinforcement part is configured as a groove or a protrusion, the number of the reinforcement parts is plural, and the plural reinforcement parts are disposed at intervals.

5. The battery pack upper cover according to claim 1, wherein two sides of one surface of the second cover plate far away from the heat insulation colloid are provided with stop parts, two stop parts are oppositely arranged, the two stop parts extend along the length direction of the second cover plate, and the stop parts are arranged to be capable of stopping side beams of the power battery pack.

6. The battery pack upper cover according to claim 5, wherein a plurality of connecting pieces which are distributed at equal intervals along the length direction of the second cover plate are formed on one surface of the second cover plate, which is far away from the heat insulation colloid, each connecting piece extends along the width direction of the second cover plate, two ends of each connecting piece are respectively connected with two stop parts, and each connecting piece can be positioned between every two adjacent electric cells of the power battery pack and connected with structural colloid between every two adjacent electric cells.

7. The battery pack cover according to any one of claims 1 to 6, wherein the heat insulation colloid is constructed as a potting adhesive, the thickness of the heat insulation colloid is 4 to 6mm, the heat conductivity coefficient of the heat insulation colloid is 0.05 to 0.2W/(m-K), and the fire rating of the heat insulation colloid is UL-V0.

8. A power battery pack, comprising a housing, a battery cell and a battery pack upper cover according to any one of claims 1-7, wherein the battery cell is connected in the housing, a first cover plate of the battery pack upper cover is arranged on the top of the housing and connected with the top of the housing, and a second cover plate is arranged on the battery cell and connected with the battery cell.

9. The power battery pack according to claim 8, wherein the inner side wall of the housing is formed with two oppositely disposed support portions, and both sides of the second cover plate are respectively connected with the top portions of the two support portions.

10. The power cell pack of claim 9, further comprising two oppositely disposed side rails, the two side rails being positioned between the two support portions and respectively connected to the two oppositely disposed inner side walls of the housing, each side rail being provided with an exhaust member configured to channel the flue gas.

11. A vehicle comprising a power cell pack as claimed in any one of claims 8 to 10.