CN217114681U

CN217114681U - Power battery and vehicle

Info

Publication number: CN217114681U
Application number: CN202122858526.1U
Authority: CN
Inventors: 李鑫; 李玉军; 侯艳丽; 李鸿键
Original assignee: Beijing Shengneng Energy Technology Co Ltd
Current assignee: Beijing Shengneng Energy Technology Co Ltd
Priority date: 2021-11-22
Filing date: 2021-11-22
Publication date: 2022-08-02
Anticipated expiration: 2031-11-22

Abstract

The utility model relates to a battery technology field discloses a power battery, including electric core and battery box, the battery box has the holding chamber, and the battery box includes box and last box down, goes up the box lid and locates down on the box, and electric core is fixed in down on the box in order to be located this holding intracavity. Be provided with first pressure release passageway and the second pressure release passageway of mutual intercommunication on the box down, the box includes the bottom plate and locates the curb girder of bottom plate circumference direction down, and first pressure release passageway sets up on the bottom plate, and second pressure release passageway sets up in the curb girder and can communicate with the external world, and electric core sets up on the bottom plate, and the relief valve sets up towards first pressure release passageway. When electric core took place thermal runaway, harmful substance can directly erupt into first pressure release passageway to outside the battery box was discharged through second pressure release passageway, reduce the speed of spreading of thermal diffusion in the battery box, improve battery system's security performance. The utility model also discloses a vehicle, including foretell power battery, can be when electric core thermal runaway, in time discharge harmful substance.

Description

Power battery and vehicle

Technical Field

The utility model relates to a battery technology field especially relates to a power battery and vehicle.

Background

The power battery is the core part of the vehicle, but along with the improvement of the cell energy density in the battery system, the thermal runaway risk of the cell is increased, and after the thermal runaway of the cell reaches a certain temperature, an uncontrollable state can occur, so that the temperature inside the battery system rises linearly, and the combustion and the explosion are caused.

Even the vehicle can install battery thermal management system usually, dispels the heat and cools down to electric core, but can not prevent electric core emergence thermal runaway completely, electric core after thermal runaway appears in the part, can creep to whole battery system fast. The battery box upper cover adopts lightweight design usually, or adopts plastics material or uses thin wall punching press metal, leads to the battery box upper cover to reduce in the high temperature resistant ability of the direction towards passenger cabin, in case take place the thermal runaway, poisonous high temperature gas or flame can break through the shell of battery box rapidly and spread to passenger cabin, reduce passenger cabin member's survival probability.

Therefore, a power battery and a vehicle are needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a power battery can be when battery thermal runaway takes place, outside in time dredging the battery box with harmful substance, improves battery system's security performance.

As the above conception, the utility model discloses the technical scheme who adopts is:

a power cell, comprising:

the battery core is provided with a pressure release valve;

the battery box has the holding chamber, the battery box includes box and last box down, go up the box lid and locate down on the box, be provided with the first pressure release passageway and the second pressure release passageway of mutual intercommunication down on the box, the box includes the bottom plate and locates the curb girder of bottom plate circumference direction down, first pressure release passageway set up in on the bottom plate, the second pressure release passageway set up in just can communicate with the external world in the curb girder, electric core set up in on the bottom plate, just the relief valve orientation first pressure release passageway sets up.

Optionally, n sets of mounting beams are arranged on the bottom plate, each set of mounting beam includes at least two mounting beams arranged oppositely along a first direction, at least two adjacent mounting beams in each set of mounting beams are provided with a first pressure relief channel extending along a second direction between the mounting beams, one set of mounting beams are used for fixing one set of battery cell, the battery cell is transversely spanned and arranged on the mounting beams along the first direction, so that the pressure relief valve faces the first pressure relief channel, and the first direction is perpendicular to the second direction.

Optionally, a through groove extending along the second direction is formed in the bottom plate, each through groove is formed in each group of the mounting beams, the through groove is formed between at least two adjacent mounting beams, and the through groove is arranged opposite to the pressure release valve.

Optionally, the second pressure relief channel extends along the first direction, the number of the second pressure relief channels is two, and two ends of the first pressure relief channel are communicated with the second pressure relief channel.

Optionally, the curb girder is the cavity structure, second pressure release passageway set up in the cavity of curb girder, the curb girder is close to be provided with on the lateral wall in holding chamber with the unanimous pressure release hole of first pressure release passageway quantity, first pressure release passageway pass through the pressure release hole communicate in second pressure release passageway.

Optionally, the cavity of the side beam includes an upper cavity and a lower cavity which are not communicated, and the lower cavity is communicated with the first pressure relief channel through the pressure relief hole.

Optionally, the side beam is provided with a mounting hole, and the mounting hole is only arranged through the upper cavity.

Optionally, the power battery further comprises an explosion-proof valve, and the explosion-proof valve is communicated with the second pressure relief channel outside the battery box.

Optionally, the pressure relief valve is disposed at the top of the battery cell, and the battery cell is inversely fixed to the bottom plate.

Another object of the utility model is to provide a vehicle, can in time dredge the harmful substance outside deriving the battery box when battery thermal runaway takes place, prolong the time of fleing, guarantee passenger's safety.

As the conception, the utility model adopts the technical proposal that:

a vehicle comprising a power cell as described above.

The utility model has the advantages that:

the utility model provides a power battery, including electric core and battery box, the battery box has the holding chamber, and the battery box includes box and last box down, and wherein goes up the cavity structure of box for having opening down, goes up on the box lid locates down the box, and electric core is fixed in down on the box in order to be located this holding intracavity. Be provided with the first pressure release passageway and the second pressure release passageway of mutual intercommunication on the box down, in addition, the box includes the bottom plate and locates the curb girder of bottom plate circumference direction down, and first pressure release passageway sets up on the bottom plate, and second pressure release passageway sets up in the curb girder and can communicate with the external world, and electric core sets up on the bottom plate, and the relief valve sets up towards first pressure release passageway. When the battery core is out of control due to heat, harmful substances can be directly sprayed into the first pressure relief channel and discharged out of the battery box through the second pressure relief channel, the spreading speed of heat diffusion is reduced, and the safety performance of a battery system is improved.

The utility model provides a vehicle, including as above power battery, it can in time discharge harmful substance, extension escape time when electric core thermal runaway.

Drawings

Fig. 1 is an exploded view of a power battery provided by an embodiment of the present invention;

fig. 2 is a cross-sectional view (without an upper box) of a power battery provided by an embodiment of the present invention at a first viewing angle;

fig. 3 is a cross-sectional view (without an upper box) of a power battery provided by an embodiment of the present invention at a second viewing angle.

In the figure:

1. an electric core; 2. an upper box body; 3. a lower box body; 31. a base plate; 311. an upper base plate; 312. a lower base plate; 313. reinforcing ribs; 32. a side beam; 321. an upper cavity; 322. a lower cavity; 323. a pressure relief vent; 4. and (5) mounting the beam.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

In order to effectively restrain the deterioration and spread of thermal runaway of a battery pack after the thermal runaway of the battery pack is caused by external inefficacy, and reduce the damage to passengers in a vehicle to the maximum extent, the embodiment provides a power battery which can arrange a pressure release channel on the premise of not increasing the total weight of a battery system so as to discharge harmful substances generated during the thermal runaway to the outside in a directional manner, reduce the spread speed of thermal diffusion, prevent the harmful substances from being diffused to a passenger compartment of the vehicle and guarantee the life safety of the passengers.

As shown in fig. 1, the power battery includes an electric core 1 and a battery box, the battery box has a holding cavity, the battery box includes an upper box 2 and a lower box 3, wherein the upper box 2 has a cavity structure with a downward opening, the upper box 2 covers the lower box 3, and the electric core 1 is fixed on the lower box 3 so as to be located in the holding cavity. In addition, be provided with the first pressure release passageway and the second pressure release passageway of mutual intercommunication on the lower box 3, be equipped with the relief valve on electric core 1, when electric core 1 set up on lower box 3, the relief valve of electric core 1 then need set up towards the pressure release passageway to when guaranteeing that electric core 1 thermal runaway takes place, the harmful substance that produces in the electric core 1 can be direct quick direction pressure release passageway when breaking the relief valve. In this embodiment, lower box 3 includes bottom plate 31 and locates bottom plate 31 circumferential direction's curb girder 32, and wherein first pressure release channel sets up on bottom plate 31, and second pressure release channel sets up in curb girder 32 and can communicate with the external world, and consequently knowable, when electric core 1 set up on bottom plate 31, its relief valve set up towards first pressure release channel.

Specifically, in order to fix the battery cell 1 on the bottom plate 31, n sets of mounting beams 4 are further disposed on the bottom plate 31, each set of mounting beams 4 includes at least two mounting beams 4 disposed oppositely along a first direction, and when the battery cell 1 is mounted, the battery cell 1 is disposed transversely across the mounting beams 4 along the first direction, that is, only a part of the battery cell 1 abuts against the mounting beams 4. In addition, be provided with the first pressure release passageway that extends along the second direction between two adjacent installation roof beams 4 in every group installation roof beam 4, also the part that does not butt installation roof beam 4 of electric core 1 is probably relative with first pressure release passageway, and for realizing the quick pressure release of electric core 1, then need be when installing electric core 1, make the pressure release valve of electric core 1 directly relative with first pressure release passageway. Due to the arrangement of the mounting beam 4, the electric core 1 is prevented from directly contacting the bottom plate 31 when being mounted, so that the electric core 1 is damaged by welding the bottom plate 31, the space of the first pressure relief channel is increased, and the circulation of high-temperature and high-pressure gas is facilitated. Wherein the first direction is an ab direction shown in fig. 1, the second direction is a cd direction shown in the figure, and the first direction is perpendicular to the second direction.

In addition, the pressure relief valve of the battery cell 1 in this embodiment is also disposed at the top of the battery cell 1, and therefore, in order to achieve that the pressure relief valve is directly disposed opposite to the first pressure relief channel, when the battery cell 1 is installed, the battery cell 1 needs to be inverted on the installation beam 4, and the positive electrode and the negative electrode disposed at the top of the battery cell 1 are also disposed toward the bottom plate 31, and the installation beam 4 can keep a certain distance from the bottom plate 31.

Further, in order to increase the flow area of the first pressure relief channel, as shown in fig. 2, a through groove extending along the second direction is further formed in the bottom plate 31, each through groove is formed between at least two adjacent mounting beams 4 in each group of mounting beams 4, the through groove is arranged opposite to the pressure relief valve, and the through groove belongs to a part of the first pressure relief channel. It can be known that if the bottom plate 31 is formed by combining the upper plate 311 and the lower plate 312 by the plurality of ribs 313, a plurality of channels extending along the second direction can be formed between the upper plate 311 and the lower plate 312, and in this embodiment, in order to provide the through slots, the bottom plate 31 is formed by combining the upper plate 311 and the lower plate 312 by the plurality of ribs 313, and in order to further form the through slots, the plurality of upper plates 311 are selected and the plurality of upper plates 311 are arranged at intervals. However, it should be noted that, in order to ensure that each through groove is disposed between at least two adjacent mounting beams 4 in each group of mounting beams 4, and the through grooves are disposed with respect to the pressure release valves, the positions and the number of the reinforcing ribs 313 are required to be noticed, that is, at least two reinforcing ribs 313 are disposed between at least two adjacent mounting beams 4 in each group of mounting beams 4, so as to prevent the first pressure release channel corresponding to a certain group of electric cores 1 from diffusing to the lower side of the electric cores 1 of other groups when harmful substances are discharged, thereby preventing the thermal runaway of the group of electric cores 1 from generating large influence on the electric cores 1 of other groups, and reducing the thermal spreading speed.

Furthermore, the second pressure relief channel extends along the first direction, and for further guaranteeing the quick discharge of harmful substances, the second pressure relief channel is provided with two, and the two ends of the first pressure relief channel are communicated with the second pressure relief channel. As shown in fig. 3, the second pressure relief channel is disposed in the two side beams 32 in the first direction, and the first pressure relief channel on the bottom plate 31 extends to the two side beams 32 in the first direction and is exhausted through the second pressure relief channel.

Specifically, the side beam 32 is a cavity structure, and the second pressure relief channel is arranged in the cavity of the side beam 32, so that the structure of the side beam 32 can be relied on, and a through hole does not need to be processed in the side beam 32. In order to communicate the second pressure relief channel with the first pressure relief channel, the side beam 32 is provided with pressure relief holes 323, the number of which is the same as that of the first pressure relief channels, on the side wall close to the electric core 1, so that harmful substances in the first pressure relief channel can flow to the second pressure relief channel through the pressure relief holes 323.

Optionally, in this embodiment, the cavities of the side beam 32 include an upper cavity 321 and a lower cavity 322, wherein the pressure relief hole 323 is disposed on the sidewall of the lower cavity 322, and the lower cavity 322 and the upper cavity 321 are not communicated, that is, only the lower cavity 322 of the side beam 32 may serve as the second pressure relief channel.

Alternatively, the portion of the upper chamber 321 not serving as a pressure relief passage may serve the function of securing the side beam 32, i.e. the side beam 32 serves as a portion of the lower case 3, which needs to be secured relative to the upper case 2 to achieve the enclosure of the case. Specifically, the mounting hole for fixing the upper case 2 is provided on the side member 32 only through the upper cavity 321, and a fastening member may be inserted into the upper cavity 321 through the mounting hole when mounting. Certainly, the cavity of the side beam 32 is divided into the upper cavity 321 and the lower cavity 322 which are not communicated, so that the side beam 32 can simultaneously realize two functions of fixing and pressure relief, and the structure of the battery box is simplified.

Optionally, the power battery is further provided with an explosion-proof valve, and the explosion-proof valve is arranged outside the battery box body and communicated with the second pressure relief channel. When a certain electric core 1 is out of control due to heat, harmful substances can be discharged out of the battery box in time through the explosion-proof valve through the pressure relief channel.

The embodiment also provides a vehicle, which comprises the power battery, and when the electric core is subjected to thermal runaway caused by the inefficacy force, the toxic substances sprayed by the pressure release valve can be timely discharged out of the battery box from the corresponding pressure release channel, so that the safety of the vehicle and passengers is ensured.

The above embodiments have been described only the basic principles and features of the present invention, and the present invention is not limited by the above embodiments, and is not departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A power cell, comprising:

the battery core (1) is provided with a pressure release valve;

the battery box has the holding chamber, the battery box includes box (3) and last box (2) down, it locates to go up box (2) lid box (3) is last down, be provided with the first pressure release passageway and the second pressure release passageway of mutual intercommunication down on box (3), box (3) include bottom plate (31) and curb girder (32) of locating bottom plate (31) circumference direction down, first pressure release passageway set up in on bottom plate (31), the second pressure release passageway set up in just can communicate with the external world in curb girder (32), electric core (1) set up in on bottom plate (31), just the relief valve orientation first pressure release passageway sets up.

2. The power battery according to claim 1, wherein n sets of mounting beams (4) are disposed on the bottom plate (31), each set of mounting beams (4) includes at least two mounting beams (4) disposed oppositely along a first direction, the first pressure relief channel extending along a second direction is disposed between at least two adjacent mounting beams (4) in each set of mounting beams (4), one set of mounting beams (4) is used for fixing one set of battery cells (1), and the battery cells (1) are disposed on the mounting beams (4) transversely along the first direction, so that the pressure relief valve faces the first pressure relief channel, and the first direction is perpendicular to the second direction.

3. The power battery according to claim 2, wherein the bottom plate (31) is provided with through slots extending along the second direction, each through slot is arranged between at least two adjacent mounting beams (4) in each group of mounting beams (4), and the through slots are arranged opposite to the pressure relief valves.

4. The power battery according to claim 2, wherein the second pressure relief channel extends along the first direction, two pressure relief channels are provided, and two ends of the first pressure relief channel are communicated with the second pressure relief channel.

5. The power battery according to claim 2, wherein the side beam (32) is a cavity structure, the second pressure relief channel is arranged in the cavity of the side beam (32), pressure relief holes (323) with the same number as the first pressure relief channels are arranged on the side wall of the side beam (32) close to the accommodating cavity, and the first pressure relief channels are communicated with the second pressure relief channels through the pressure relief holes (323).

6. The power battery according to claim 5, wherein the cavities of the side beam (32) comprise an upper cavity (321) and a lower cavity (322) which are not communicated, and the lower cavity (322) is communicated with the first pressure relief channel through the pressure relief hole (323).

7. The power battery according to claim 6, wherein the side beam (32) is provided with mounting holes, and the mounting holes are only arranged through the upper cavity (321).

8. The power battery according to claim 1, wherein the power battery further comprises an explosion-proof valve, and the explosion-proof valve is arranged outside the battery box and communicated with the second pressure relief channel.

9. The power battery according to claim 1, wherein the pressure relief valve is arranged on the top of the battery cell (1), and the battery cell (1) is fixed on the bottom plate (31) in an inverted manner.

10. A vehicle characterized by comprising the power battery according to any one of claims 1-9.