CN220652266U

CN220652266U - Battery pack and new energy automobile

Info

Publication number: CN220652266U
Application number: CN202322072279.1U
Authority: CN
Inventors: 朱仁杰; 黄伟; 马建生; 陈锋; 展丙汉; 张洪雷; 张旭; 戴大力
Original assignee: Hozon New Energy Automobile Co Ltd
Current assignee: Hozon New Energy Automobile Co Ltd
Priority date: 2023-08-03
Filing date: 2023-08-03
Publication date: 2024-03-22
Anticipated expiration: 2033-08-03

Abstract

The application provides a battery pack and a new energy automobile. The battery pack comprises a battery box and a protection plate, wherein the battery box is provided with a containing cavity for containing at least one battery cell; the appointed box wall of the battery box is attached to the outer side wall of the battery cell where the pressure release valve of the battery cell is located, and at least one exhaust hole is formed in the appointed box wall, so that the exhaust holes correspond to the pressure release valves of the battery cell one by one; the protection plate is arranged outside the appointed box wall at intervals to form an exhaust cavity, an exhaust channel is formed in the exhaust cavity, at least one through hole is formed in the protection plate for installing an explosion-proof valve, and the through hole is communicated with the exhaust channel.

Description

Battery pack and new energy automobile

Technical Field

The application relates to the technical field of new energy automobiles, in particular to a battery pack and a new energy automobile.

Background

Recently, the new energy automobile industry is developing at a high speed, and the power battery is used as a core part of the new energy automobile, and has an important influence on the layout of the new energy automobile industry.

The power battery is usually formed by connecting a plurality of battery cells in series or in parallel, and the power battery can release heat in the use process, so that the phenomena of expansion, thermal runaway and the like are easy to occur; most designers provide explosion-proof valves on the housing of the power cell to vent the high temperature and pressure gases released from the internal cell.

However, as the capacity and load of the power battery increase, more and more heat can be generated by the power battery, the explosion-proof valve cannot meet the requirements of explosion prevention and thermal safety when the battery core is in thermal runaway.

Disclosure of Invention

The embodiment of the application aims to provide a battery pack and a new energy automobile, so as to solve the problem that the existing explosion-proof structure of a power battery cannot meet the requirements of explosion prevention and thermal safety when a battery core is in thermal runaway.

In order to solve the technical problems, the embodiment of the application provides the following technical scheme:

a first aspect of the present application provides a battery pack, comprising:

a battery box having a receiving cavity to receive at least one battery cell; the appointed box wall of the battery box is attached to the outer side wall of the battery cell where the pressure release valve of the battery cell is located, and at least one exhaust hole is formed in the appointed box wall, so that the exhaust holes correspond to the pressure release valves of the battery cell one by one;

the protection plate is arranged outside the appointed box wall at intervals to form an exhaust cavity, an exhaust channel is formed in the exhaust cavity, at least one through hole is formed in the protection plate for installing an explosion-proof valve, and the through hole is communicated with the exhaust channel.

In some modified embodiments of the first aspect of the present application, the battery pack is provided with a plurality of exhaust holes on the specified case wall;

the exhaust holes are arranged on the appointed box wall in an array manner along the length and width directions of the exhaust holes;

the exhaust channels extend on the protection plate along the length direction of the protection plate, and a plurality of exhaust channels are arranged on the protection plate at intervals along the width direction of the protection plate; or alternatively

The exhaust channels extend on the protection plate along the width direction of the protection plate, and a plurality of exhaust channels are arranged on the protection plate at intervals along the length direction of the protection plate.

In some modified embodiments of the first aspect of the present application, in the foregoing battery pack, a portion of the plate body, which is toward the designated wall, is bent to form a plurality of first protrusions with a space therebetween, and the exhaust channel is formed between adjacent first protrusions; or alternatively

And part of the plate body of the protection plate is bent towards the side away from the appointed box wall to form a plurality of second bulges at intervals, so that the exhaust channel is formed at the side, facing the appointed box wall, of the second bulges.

In some modified embodiments of the first aspect of the present application, the aforementioned battery pack, wherein a side of the protection plate facing the designated case wall is provided with a plurality of partitions at intervals, so as to form the exhaust passage between adjacent partitions.

In some modified embodiments of the first aspect of the present application, the foregoing battery pack is provided with a sealing film at the vent hole, and the sealing film covers the vent hole.

In some variations of the first aspect of the present application, the aforementioned battery pack further includes a plurality of battery cells;

the plurality of electric cores are arranged in an array in the accommodating cavity, and adjacent electric cores are mutually attached;

wherein the battery cell is adhered to at least one wall of the battery box so as to reduce the relative movement of the battery cell relative to the battery box; or alternatively

The battery cell is subjected to pre-pressure of the box wall of the battery box so as to be closely attached to the adjacent battery cell and the box wall of the battery box, so that the relative movement of the battery cell relative to the battery box is reduced.

In some variations of the first aspect of the present disclosure, the aforementioned battery pack, wherein the battery case comprises a top plate, a bottom plate, a first end plate, a second end plate, a first side plate, and a second side plate; the top plate and the bottom plate are vertically spaced and opposite, and the first end plate, the first side plate, the second end plate and the second side plate are sequentially connected end to end and are arranged between the top plate and the bottom plate so as to enclose the accommodating cavity;

when the first electrode lug, the second electrode lug and the pressure release valve of the battery cell are positioned on the same side of the battery cell, the outer side wall of the battery cell where the pressure release valve is positioned is attached to the top plate; or alternatively

When the first electrode lug, the second electrode lug and the pressure release valve of the battery cell are positioned on two opposite sides of the battery cell, the outer side wall of the battery cell where the pressure release valve is positioned is attached to the bottom plate; or alternatively

When the first electrode lug, the pressure release valve and the second electrode lug of the battery cell are positioned on two opposite sides of the battery cell, the outer side wall of the battery cell where the first electrode lug and the pressure release valve are positioned is attached to the first side plate or the second side plate; or alternatively

When the first electrode lug and the second electrode lug of the battery cell are positioned on two sides of the battery cell opposite to each other and the pressure release valve is positioned on other different sides, the outer side wall of the battery cell where the first electrode lug and the second electrode lug are positioned is respectively attached to the first side plate and the second side plate, and the outer wall of the battery cell where the pressure release valve is positioned is attached to the bottom plate.

In some variations of the first aspect of the present application, the battery pack further comprises at least one cross member;

at least one cross beam is arranged between the first end plate and the second end plate so as to divide the accommodating cavity into at least two subchambers.

In some modified embodiments of the first aspect of the present application, the foregoing battery pack is provided with a flow channel in the bottom plate to accommodate the cooling fluid, and a fluid inlet and a fluid outlet are provided on the bottom plate.

A second aspect of the present application provides a new energy vehicle, including the battery pack provided in the first aspect of the present application.

Compared with the prior art, the battery pack provided by the first aspect of the application has the advantages that the vent holes corresponding to the pressure release valves one by one are arranged on the appointed box wall of the pressure release valve corresponding to the battery cell, so that high-temperature and high-pressure gas or electrolyte can be discharged only through the vent hole corresponding to the battery cell when the battery cell is out of control, and the heat damage to other battery cells is avoided; simultaneously, the exhaust channel formed by the protection plates is matched outside the battery box to guide gas to the through hole and discharge the gas out of the battery box through the explosion-proof valve, so that the problem of cracking of the box body is avoided, and the exhaust cavity can also receive electrolyte discharged by the thermal runaway battery cell and even solid matters of electrode materials, so that the influence of the discharge of the electrolyte on user experience is avoided. The problem that the existing explosion-proof structure of the power battery cannot meet the requirements of explosion prevention and thermal safety when the battery core is in thermal runaway is effectively solved.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings, in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 schematically shows a schematic structural view of a battery box in a battery pack provided by the present application;

fig. 2 schematically illustrates a structural schematic diagram of an arrangement of the battery cells provided in the present application in a battery box;

fig. 3 schematically illustrates a structural schematic diagram of another arrangement of the battery cells provided in the present application in a battery box;

fig. 4 schematically shows a partial structural cross-sectional view of a battery pack provided in the present application;

fig. 5 schematically illustrates a first schematic view of a cell in a battery pack provided herein;

fig. 6 schematically illustrates a second schematic view of a cell in a battery pack provided herein;

fig. 7 schematically illustrates a third schematic diagram of a cell in a battery pack provided herein;

fig. 8 schematically illustrates a fourth schematic diagram of a cell in a battery pack provided herein;

reference numerals illustrate:

the protection plate 1, the through hole 11, the first bulge 12, the battery core 2, the pressure relief valve 21, the first lug 22, the second lug 23, the exhaust hole 3, the exhaust channel 4, the bottom plate 5, the first end plate 6, the second end plate 7 and the cross beam 8.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.

Example 1

With reference to fig. 1, 2 and 3, a first aspect of the present application provides a battery pack comprising a battery case having a receiving cavity to receive at least one battery cell 2, and a protection plate 1; the appointed box wall of the battery box is attached to the outer side wall of the battery cell where the pressure release valve 21 of the battery cell 2 is located, and at least one exhaust hole 3 is arranged on the appointed box wall, so that the exhaust holes 3 are in one-to-one correspondence with the pressure release valves 21 of the battery cell 2; the protection plate 1 is arranged outside the specified box wall at intervals to form an exhaust cavity, an exhaust channel 4 is formed in the exhaust cavity, at least one through hole 11 is formed in the protection plate 1 for installing an explosion-proof valve (not shown in the figure), and the through hole 11 is communicated with the exhaust channel 4.

Specifically, in order to solve the problem that the existing explosion-proof structure of the power battery can not meet the requirements of explosion prevention and thermal safety when the battery core is in thermal runaway, the battery pack is provided with the exhaust holes 3 which are in one-to-one correspondence with the pressure release valves 21 on the box walls of the pressure release valves 21 corresponding to the battery core 2, so that high-temperature and high-pressure gas and electrolyte can be discharged outwards only through the exhaust holes 3, the exhaust channels 4 and the explosion-proof valves when the battery core 2 is in thermal runaway, the cracking of the box body is prevented, and the specified box walls are attached to the outer side walls of the battery core 2, so that the discharged high-temperature and high-pressure gas can not return into the accommodating cavity through other exhaust holes 3, and the thermal damage to other battery cores 2 is avoided; the exhaust cavity and the exhaust channel 4 for guiding flow in the exhaust cavity are formed through the arrangement of the protection plate 1, and the exhaust channel 4 is communicated with the through hole 11 so as to quickly guide high-temperature and high-pressure gas to the explosion-proof valve (not shown in the figure) for discharging, so that the efficiency of discharging and radiating heat is greatly improved. Meanwhile, the arrangement of the exhaust cavity can also receive electrolyte discharged by the thermal runaway battery cell and even solid matters of electrode materials, so that the direct external discharge of the electrolyte is avoided to influence the user experience.

Referring to fig. 1, the battery case is a cavity type structure for accommodating the battery cell 2, and the battery case may be, but is not limited to, a rectangular parallelepiped, a cylinder, or the like; the electric core 2 in the battery box can be in a tiled arrangement or a stacked arrangement, and the number of the electric cores 2 can be designed and adjusted according to actual needs. The battery box in this embodiment may include a rigid top plate (not shown), a bottom plate 5, a first end plate 6, a second end plate 7, a first side plate (not shown), and a second side plate (not shown); the top plate (not shown in the figure) and the bottom plate 5 are spaced up and down and are opposite, and the first end plate 6, the first side plate (not shown in the figure), the second end plate 7 and the second side plate (not shown in the figure) are sequentially connected end to end and are disposed between the top plate (not shown in the figure) and the bottom plate 5 so as to enclose the accommodating cavity. The specified box wall in the embodiment may be, but is not limited to, a bottom plate 5, and the specified box wall is selected according to the structure of the battery cell 2, specifically, the position of the pressure release valve 21 on the reference battery cell 2 is attached to the outer side wall of the battery cell where the pressure release valve 21 is located, so that the specified box wall separates the battery cell 2 from the exhaust channel 4, and high-temperature and high-pressure gas and the like are prevented from flowing back to other battery cells 2 in the specified box wall; the shape and size of the vent hole 3 are not limited herein, as long as the vent hole can completely correspond to the pressure release valve 21, and in this embodiment, the vent hole 3 is preferably set to be larger than the size of the pressure release valve 21, that is, as shown in fig. 4, so as to ensure that the discharged material will not move from the vent hole 3 to the position of other battery cells 2 when the battery cells 2 are out of control.

Referring to fig. 2 and fig. 3, the battery cell 2 is a single electrochemical cell structure with positive and negative electrodes, a plurality of battery cells 2 are accommodated in a battery box to be connected and discharged in a serial or parallel manner, a first tab 22, a second tab 23 and a pressure release valve 21 are exposed outside the battery cell 2, and the above structure is easily understood by those skilled in the art and will not be repeated herein. The battery cell 2 in this embodiment includes at least four kinds of following:

first kind: referring to fig. 5, the first tab 22, the second tab 23, and the pressure release valve 21 of the battery cell 2 are located on the same side of the battery cell 1, and when the battery cell 2 under this structure corresponds to the battery cell, the outer side wall of the battery cell where the pressure release valve 21 is located may be attached to the top plate (not shown in the drawing) or the bottom plate 5 or the first side plate (not shown in the drawing) or the second side plate (not shown in the drawing), and then the top plate (not shown in the drawing) or the bottom plate 5 or the first side plate (not shown in the drawing) or the second side plate (not shown in the drawing) attached to the top plate (not shown in the drawing) or the first side plate (not shown in the drawing) is the specified wall, on which the exhaust hole 3 needs to be provided.

Second kind: referring to fig. 6, the first tab 22 and the second tab 23 of the battery cell 2 are located on two opposite sides of the battery cell 2, that is, the first tab 22 and the second tab 23 are located on the same side, and the pressure release valve 21 is located on the opposite side, so that when the battery cell 2 under this structure corresponds to the battery cell, the outer side wall of the battery cell where the pressure release valve 21 is located may be attached to the top plate (not shown in the figure) or the bottom plate 5 or the first side plate (not shown in the figure) or the second side plate (not shown in the figure), preferably attached to the bottom plate 5, so as to expose the tab on the top plate side for connection of the wiring; the top plate (not shown) or the bottom plate 5 or the first side plate (not shown) or the second side plate (not shown) which are attached to the bottom plate are the designated box wall, and the exhaust hole 3 is required to be arranged on the designated box wall.

Third kind: referring to fig. 7, the first tab 22, the pressure release valve 21 and the second tab 22 of the battery cell 2 are located at two opposite sides of the battery cell 2, that is, the first tab 22 and the pressure release valve 21 are located at the same side, and the second tab 23 is located at the opposite side, so that when the battery cell 2 under this structure corresponds to the battery cell, the outer side wall of the battery cell where the pressure release valve 21 is located may be attached to the top plate (not shown in the figure) or the bottom plate 5 or the first side plate (not shown in the figure) or the second side plate (not shown in the figure), and then the top plate (not shown in the figure) or the bottom plate 5 or the first side plate (not shown in the figure) or the second side plate (not shown in the figure) is the designated box wall, on which the exhaust hole 3 needs to be provided. It is preferable that the outer side wall of the battery cell where the pressure release valve 21 is located is attached to the first side plate (not shown) or the second side plate (not shown), so that the wiring end is reserved at the side plate position instead of the top plate position, so as to ensure that the height of the battery pack is small.

Fourth kind: referring to fig. 8, the first tab 22 and the second tab 23 of the battery cell 2 are located on two opposite sides of the battery cell 2 and the pressure release valve 21 is located on other different sides, when corresponding to the battery cell 2 under this structure, the outer side walls of the battery cell where the first tab 22 and the second tab 23 are located are respectively attached to the first side plate (not shown in the figure) and the second side plate (not shown in the figure), and the outer wall of the battery cell where the pressure release valve 21 is located is attached to the bottom plate 5 or the top plate (not shown in the figure), so that the wiring end is reserved at the side plate position instead of the top plate position, so as to ensure that the height of the battery pack is small. The top plate (not shown) or the bottom plate 5 is the designated wall, and the exhaust hole 3 is required to be formed thereon.

Referring to fig. 1 and 4, a protection plate 1 is a rigid plate body, the rigid plate body is arranged at intervals with a designated tank wall, the circumferential edge of the protection plate 1 can be in sealing connection with the designated tank wall through a flanging structure so as to form an exhaust cavity between the designated tank wall and the protection plate 1, when thermal runaway occurs in a battery core 2, high-temperature and high-pressure gas, even electrolyte and electrode material solid structures can be discharged into the exhaust cavity through an exhaust hole 3, and then the gas is discharged through an explosion-proof valve to dissipate heat and reduce pressure, so that the exhaust cavity can effectively buffer gas impact and receive the electrolyte and electrode material solid structures, and unnecessary personnel or vehicle body damage caused by splashing of the electrolyte and electrode material solid structures from the explosion-proof valve is avoided; the distance between the designated tank wall and the protection plate 1 is not limited herein, and can be designed and adjusted according to actual needs. The exhaust channel 4 can be a ravine or a groove formed by stamping the protection plate 1, or a channel formed by arranging a baffle plate in the exhaust cavity in a surrounding way; the exhaust passage 4 may be provided according to the arrangement of the battery cells 2, for example: the continuous arrangement along the length or width direction of the protection plate 1 can also be serpentine, so long as the continuous arrangement can be communicated to the through holes 11, thereby realizing the diversion of high-temperature high-pressure gas, even electrolyte and solid structures of electrode substances, and realizing the rapid discharge of the gas. The number of the exhaust channels 4 is correspondingly set according to the number of the battery cells 2. The shape of the through holes 11 is matched with that of the explosion-proof valves, the number of the through holes 11 can be designed and adjusted according to actual needs, the through holes 11 can be arranged at four corners, edges, middle parts and the like of the protection plate 1, and specific arrangement positions can be designed and adjusted according to actual needs.

According to the above list, in the battery pack provided in the first aspect of the present application, the vent holes 3 corresponding to the relief valves 21 one by one are provided on the designated wall of the relief valve 21 corresponding to the battery cell 2, so that when a certain battery cell 2 is out of control, the high-temperature and high-pressure gas or electrolyte can be discharged only through the corresponding vent hole 3, so as to avoid heat damage to other battery cells 2; simultaneously, the exhaust channel 4 formed by the protection plate 1 is matched outside the battery box to guide gas to the through hole 11 to be discharged out of the battery box through the explosion-proof valve, so that the problem of cracking of the box body is avoided, and the exhaust cavity can also receive electrolyte discharged by the thermal runaway battery cell 2 and even solid matters of electrode materials, so that the influence of the discharge of the electrolyte on user experience is avoided. The problem that the existing explosion-proof structure of the power battery cannot meet the requirements of explosion prevention and thermal safety when the battery core is in thermal runaway is effectively solved.

Further, referring to fig. 2 and fig. 3, in the battery pack provided in this embodiment, in a specific implementation, a plurality of exhaust holes 3 are provided on the specified wall; the exhaust holes 3 are arranged on the appointed box wall in an array manner along the length and width directions;

the exhaust channels 4 extend on the protection plate 1 along the length direction thereof, and a plurality of exhaust channels 4 are arranged on the protection plate 1 at intervals along the width direction thereof; or the exhaust channels 4 extend on the protection plate 1 along the width direction thereof, and a plurality of exhaust channels 4 are arranged on the protection plate 1 at intervals along the length direction thereof.

Specifically, in order to match the cells 2 arranged in a matrix, in this embodiment, the exhaust holes 3 on the formulated tank wall are arranged in an array along the length and width directions of the designated tank wall, and then the exhaust channels 4 on the protection plate 1 have the following two arrangement modes; first, referring to fig. 1, the exhaust channels 4 are arranged corresponding to the rows of the battery cells 2 extending along the length direction of the protection plate 1, and correspondingly, several exhaust channels 4 are arranged at intervals corresponding to the rows of the battery cells 2, so as to ensure that all the battery cells 2 have the corresponding exhaust channels 4. Similarly, the second type of exhaust channels 4 are arranged corresponding to the rows of the battery cells 2 extending along the width direction of the protection plate 1, and correspondingly, several exhaust channels 4 are arranged at intervals corresponding to the rows of the battery cells 2, so as to ensure that all the battery cells 2 have the corresponding exhaust channels 4. Of course, it will be understood that when the arrangement of the battery cells 2 is changed, the exhaust holes 3 and the exhaust channels 4 are correspondingly changed.

Further, in the battery pack provided in this embodiment, in order to implement the arrangement of the exhaust passage 4, at least the following three arrangements are given in this embodiment:

first, referring to fig. 1, a portion of the plate body of the protection plate 1 is bent toward the designated wall side to form a plurality of first protrusions 12 at intervals, and the exhaust passages 4 are formed between adjacent first protrusions 12. Specifically, the first protrusion 12 may be formed by a process such as press molding or injection molding.

Second kind: a part of the plate body of the protection plate 1 is bent toward a side facing away from the specified wall to form a plurality of second protrusions (not shown) at intervals so as to form the exhaust passage 4 at a side of the second protrusions (not shown) toward the specified wall. In particular, the second protrusion (not shown) may be formed by a process such as stamping or injection molding.

Third kind: a plurality of partitions (not shown) are provided at intervals on a side of the shielding plate 1 facing the designated tank wall to form the exhaust passage 4 between adjacent partitions (not shown). The partition plate (not shown in the figure) is a rigid structure, one end of the partition plate, which is away from the protection plate 1, can be connected with or not connected with the designated box wall, and the partition plate (not shown in the figure) and the protection plate 1 can be integrally formed or can be subsequently assembled in a welding, screwing mode and the like.

Further, in the battery pack provided in this embodiment, in a specific implementation, a blocking film (not shown in the figure) is disposed at the exhaust hole 3, and the blocking film (not shown in the figure) covers the exhaust hole 3.

Specifically, in order to avoid the linkage heat damage, in this embodiment, a blocking film (not shown in the figure) is disposed at the exhaust hole 3, the blocking film covers the exhaust hole 3, when a certain cell 2 is thermally out of control, the blocking film at the exhaust hole 3 corresponding to the blocking film can be broken to perform external exhaust, but the blocking films corresponding to other cells 2 are not affected, and substances such as high temperature and high pressure entering the exhaust cavity are not returned to the other cells 2, so that the safety of the battery is effectively ensured, and the heat damage isolation is realized; the blocking film may be, but is not limited to, mica paper.

Further, referring to fig. 2 and fig. 3, the battery pack provided in the present embodiment further includes a plurality of battery cells 2 in a specific implementation;

the plurality of electric cores 2 are arranged in an array in the accommodating cavity, and the adjacent electric cores 2 are mutually attached; wherein the battery cell 2 is adhered to at least one wall of the battery box so as to reduce the relative movement of the battery cell 2 relative to the battery box; or alternatively

The battery cell 2 is pre-pressed by the wall of the battery box to be closely attached to the adjacent battery cell 2 and the wall of the battery box, so that the relative movement of the battery cell 2 relative to the battery box is reduced.

Specifically, in this embodiment, the battery core 2 is mounted by means of adhesion or space extrusion, so that the battery core 2 is directly mounted in the battery box, and other structural members are not required to be connected or assembled to form a module, thereby greatly simplifying the structure of the battery pack and effectively reducing the weight of the battery pack. The cell 2 can be adhered to any wall of the battery box, such as the bottom plate 5, in an adhering manner, and other cells 2 can be adhered to the cell 2 and/or the wall; the space extrusion mode can be realized through the cooperation of the first end plate 6, the second end plate 7, the first side plate (not shown in the figure) and the second side plate (not shown in the figure), namely, the four side plates exert precompression in the middle so that the battery cells 2 can be closely attached to each other, and the occurrence of play is avoided.

Further, referring to fig. 2 and fig. 3, the battery pack provided in this embodiment, in an implementation, the battery box further includes at least one cross beam 8; at least one of the cross members 8 is arranged between the first end plate 6 and the second end plate 7 to divide the receiving chamber into at least two sub-chambers.

Specifically, in order to improve the strength of the battery pack and avoid local damage or collapse, at least one cross beam 8 is disposed in the battery box in this embodiment, and the cross beam 8 has a rigid structure, which may be, but is not limited to, plate-shaped, cylindrical, columnar, etc.; the cross beam 8 is disposed between the first end plate 6 and the second end plate 7, preferably in the middle, may be parallel to or have a certain angle with the first end plate and the second end plate, and may or may not be connected to both ends of the cross beam 8. The cross beam 8 can be integrally formed with the bottom plate 5, and can be assembled later by welding or screwing, and the like, and is preferably in a screwing mode in the embodiment, so that detachable arrangement is realized, and flexible and adjustable arrangement can be realized according to the actual arrangement condition of the battery cell 2.

Further, in the battery pack provided in this embodiment, in an implementation manner, a flow channel (not shown in the figure) is provided in the bottom plate 5 to accommodate a cooling fluid, and a fluid inlet (not shown in the figure) and a fluid outlet (not shown in the figure) are provided on the bottom plate 5.

Specifically, in order to further improve the safety of the battery pack, in this embodiment, the bottom plate 5 is configured as a liquid cooling plate, and a flow channel is configured in the bottom plate to accommodate a cooling fluid, so that the cooling fluid can effectively dissipate heat of the battery cell 2, and thermal runaway of the battery cell 2 is avoided; meanwhile, in this arrangement, the bottom plate 5 is preferably provided as a specified tank wall in the present embodiment, and accordingly, the arrangement of the flow passage needs to avoid the arrangement position of the exhaust hole 3. Of course, it is understood that other walls may be provided in the form of a liquid cooling plate when the walls are designated. And it should be noted that: when appointed case wall is not bottom plate 5, then bottom plate 5 can also set up the bottom guard plate outward, and when actual installation, bottom guard plate is towards ground, prevents that the battery box from being scraped and bumped, improves the safety in utilization.

Example 2

A second aspect of the present application provides a new energy vehicle, including the battery pack provided in the first aspect of the present application. By adopting the battery pack provided by the first aspect of the application, the vent holes corresponding to the pressure release valves one by one are formed in the appointed box wall of the pressure release valve corresponding to the battery cell, so that when a certain battery cell is in thermal runaway, high-temperature and high-pressure gas or electrolyte can be discharged through the vent hole corresponding to the certain battery cell, and thermal damage to other battery cells is avoided; simultaneously, the exhaust channel formed by the protection plates is matched outside the battery box to guide gas to the through hole and discharge the gas out of the battery box through the explosion-proof valve, so that the problem of cracking of the box body is avoided, and the exhaust cavity can also receive electrolyte discharged by the thermal runaway battery cell and even solid matters of electrode materials, so that the influence of the discharge of the electrolyte on user experience is avoided. The problem that the existing explosion-proof structure of the power battery cannot meet the requirements of explosion prevention and thermal safety when the battery core is in thermal runaway is effectively solved.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery pack, comprising:

2. The battery pack according to claim 1, wherein:

a plurality of exhaust holes are formed in the appointed box wall;

3. The battery pack according to claim 1, wherein:

part of the plate body of the protection plate is bent towards the side of the appointed box wall to form a plurality of first bulges with intervals, and the exhaust channel is formed between every two adjacent first bulges; or alternatively

4. The battery pack according to claim 1, wherein:

and a plurality of partition plates are arranged at intervals on one side of the protection plate, facing the appointed box wall, so that the exhaust channel is formed between the adjacent partition plates.

5. The battery pack according to claim 1, wherein:

the exhaust hole is provided with a blocking film, and the blocking film covers the exhaust hole.

6. The battery pack according to claim 1, wherein:

the battery also comprises a plurality of battery cores;

7. The battery pack according to claim 6, wherein:

the battery box comprises a top plate, a bottom plate, a first end plate, a second end plate, a first side plate and a second side plate; the top plate and the bottom plate are vertically spaced and opposite, and the first end plate, the first side plate, the second end plate and the second side plate are sequentially connected end to end and are arranged between the top plate and the bottom plate so as to enclose the accommodating cavity;

8. The battery pack according to claim 7, wherein:

the battery box further comprises at least one cross beam;

9. The battery pack according to claim 7, wherein:

the bottom plate is internally provided with a flow channel for accommodating cooling fluid, and the bottom plate is provided with a fluid inlet and a fluid outlet.

10. A new energy automobile, characterized in that it comprises:

the battery pack of any one of claims 1-9.