CN216529115U

CN216529115U - Battery pack

Info

Publication number: CN216529115U
Application number: CN202122880878.7U
Authority: CN
Inventors: 李凡; 黄莹; 陈智伟; 饶焰; 陈朝海; 王鸿鹄
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2021-11-23
Filing date: 2021-11-23
Publication date: 2022-05-13
Anticipated expiration: 2031-11-23
Also published as: WO2023093432A1

Abstract

The utility model belongs to the technical field of batteries and discloses a battery pack. This battery package includes battery box, a plurality of electric core, insulating film and relief valve. The battery box comprises a box body and a first box cover, wherein a first containing cavity is formed in the box body, and the first box cover and the box body are connected in a sealing mode to form a second containing cavity. A plurality of electric cores are fixed in first appearance chamber. The bottom plate of the box body is provided with a vent hole, the insulating film is laid between the battery cell and the bottom plate and used for sealing the vent hole, and high-temperature gas generated when the battery cell is out of control due to heat can enter the second accommodating cavity from the first accommodating cavity through the vent hole. The pressure release valve is arranged on the side wall of the box body, and high-temperature gas in the second accommodating cavity can be discharged through the pressure release valve. The battery pack can rapidly discharge high-temperature gas generated when the battery core is out of control due to heat, and effectively prevents the battery pack from exploding.

Description

Battery pack

Technical Field

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

Background

The power battery is widely used as a power source of the electric automobile, and as a core component of the electric automobile, the battery is concerned with the safety of the automobile. For the battery, the maximum maintenance is thermal runaway of the battery, the battery can be spontaneously ignited due to a serious thermal runaway phenomenon, and after the thermal runaway of the battery reaches a certain temperature, the internal temperature of the battery can be rapidly increased, so that an explosion accident can be caused. Therefore, thermal runaway is a serious safety accident for the power battery, and directly threatens the safety of vehicles and users, so that certain safety measures are very important for the thermal runaway.

In the present industry, power battery's cylinder electricity core adopts the plastic support to fix a position and insulate usually, then, will install in the metal box to only there is a inclosed appearance chamber in the box of battery, and the electric core does not have solitary pressure release passageway. When the battery pack is provided with only one closed accommodating cavity, a single battery core is out of control due to heat, the whole accommodating cavity is filled with high-temperature gas, the high-temperature gas cannot be effectively and timely discharged, the thermal out of control of the whole battery system is caused, and the safety performance is poor.

Therefore, it is desirable to provide a battery pack to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a battery pack, which can rapidly discharge high-temperature gas generated when a battery core is out of control due to heat and effectively prevent the battery pack from exploding.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a battery pack, comprising:

the battery box comprises a box body and a first box cover, wherein a first containing cavity is arranged in the box body; the first box cover and the box body are connected in a sealing mode to form a second containing cavity;

the plurality of battery cells are fixed in the first cavity;

the bottom plate of the box body is provided with a vent hole, the insulating film is laid between the battery cell and the bottom plate and used for sealing the vent hole, and high-temperature gas generated when the battery cell is out of control due to heat can melt the insulating film and enters the second cavity from the first cavity through the vent hole;

and the pressure release valve is arranged on the side wall of the box body, and the high-temperature gas in the second cavity can be discharged through the pressure release valve.

Optionally, the insulating film is a PET film.

Optionally, the insulating film is fixedly connected with a bottom plate of the box body.

Optionally, the number of the air vents is multiple, and the positions of the air vents correspond to the positions of the battery cells one to one.

Optionally, it is a plurality of electric core and a plurality of the blow vent all follows the length direction of box is the row and arranges the outside of bottom plate, adjacent two are listed as be equipped with the fin between the blow vent to form gas channel.

Optionally, the pressure relief valve is located on a side wall of the tank in front of the gas passage outlet.

Optionally, the plurality of battery cells are fixedly bonded by glue.

Optionally, a first sealing strip is arranged between the first box cover and the box body.

Optionally, the box body comprises a second cover and a casing, and the second cover is connected with the casing in a sealing mode.

Optionally, a second sealing strip is arranged between the second cover and the housing.

Has the advantages that:

according to the battery pack provided by the utility model, the first containing cavity is arranged in the box body, the battery core can be arranged in the first containing cavity, the box body and the box cover are connected in a sealing manner to form the second containing cavity, the vent hole is arranged on the bottom plate of the box body, the insulating film is laid on the bottom plate, and the insulating film can be melted by high-temperature gas generated when the battery core is out of control due to heat, so that the high-temperature gas is diffused from the first containing cavity to the second containing cavity through the vent hole, and then the high-temperature gas in the second containing cavity is exhausted from the pressure release valve. The battery pack can rapidly discharge high-temperature gas generated when the battery core is out of control due to heat, and the danger of explosion of the battery pack is prevented.

Drawings

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

fig. 2 is a schematic structural diagram of the housing provided by the present invention.

In the figure:

100. a first cover; 200. a second cover; 300. a housing; 310. a vent; 320. a convex rib; 400. an electric core; 500. an insulating film; 600. a pressure relief valve; 700. a second seal strip; 800. a first seal strip.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means 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 invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

Fig. 1 is a schematic structural diagram of a battery pack provided in this embodiment, and referring to fig. 1, the battery pack includes a battery box, a plurality of battery cells 400, an insulating film 500, and a pressure release valve 600. The battery box comprises a box body and a first box cover 100, a first containing cavity is arranged in the box body, and the first box cover 100 is connected to the bottom of the box body in a sealing mode and forms a second containing cavity with the box body. A plurality of cells 400 are fixed in the first housing. The bottom plate of the box body is provided with the vent 310, the insulating film 500 is laid between the battery cell 400 and the bottom plate and used for sealing the vent 310, and high-temperature gas generated when the battery cell 400 is out of control due to heat can enter the second accommodating cavity from the first accommodating cavity through the vent 310. The pressure relief valve 600 is arranged on the side wall of the box body, and the high-temperature gas in the second cavity can be discharged through the pressure relief valve 600.

Above-mentioned battery package is through setting up first appearance chamber in the box, can set up electric core 400 at first appearance intracavity to form the second through box and case lid sealing connection and hold the chamber, set up blow vent 310 on the bottom plate of box, and lay insulating film 500 on the bottom plate, the high-temperature gas that produces when electric core 400 thermal runaway can melt insulating film 500, thereby high-temperature gas passes through blow vent 310 and from first appearance chamber diffusion to second appearance chamber, and then the high-temperature gas that the second held the chamber discharges from relief valve 600 again. The battery pack can rapidly discharge high-temperature gas generated when the battery core 400 is out of control due to heat, and the danger of explosion of the battery pack is prevented.

Referring to fig. 1, in the present embodiment, the first cover 100 is a flat plate structure, and the first cover 100 is connected to the lower portion of the box body, and the first cover and the box body may be connected by riveting, bonding, welding, or the like. In order to increase the sealing performance between the first cover 100 and the box body, a first sealing strip 800 may be disposed at the joint of the first cover 100 and the box body, and of course, other methods such as glue may be used to increase the sealing performance. In this embodiment, the box is roughly the cuboid structure, and the box includes casing 300 and second case lid 200, casing 300 and second case lid 200 sealing connection, and opening of casing 300 and second case lid 200 has the edge all to be equipped with the turn-ups, and when casing 300 and second case lid 200 were connected, the turn-ups was mutually tangent laminating, and the connected mode can be for riveting, bonding or welding etc.. Optionally, a second sealing strip 700 is provided or glue is applied at the junction of the housing 300 and the second cover 200 to increase the sealing of the case. Further, insulating film 500 in this embodiment is a PET film, and the PET film has good gas tightness, can guarantee under the normal use condition of electricity core 400, seal vent 310, guarantee the leakproofness in first appearance chamber, and first appearance chamber and second appearance chamber do not switch on each other. When the thermal runaway of the battery cell 400 occurs, the temperature of the battery cell 400 is too high, and the PET film can be melted, so that the first accommodating cavity is communicated with the second accommodating cavity through the vent 310. Optionally, the PET film is fixedly connected with the bottom plate of the box body and can be covered on the bottom plate of the box body through cold pressing or the like, and the PET film is prevented from moving in the box body.

Further, a plurality of electric cores 400 are fixed to be bonded together through glue, and in this embodiment, after the battery is placed into the box body, glue of a certain depth is filled and sealed into the first accommodating cavity, so that the side walls of the plurality of electric cores 400 and the box body and the PET film below the electric core 400 are bonded together, the purpose of fixing and stabilizing the electric cores 400 is achieved, the electric cores 400 and the box body are fixed through glue, a plastic support is not needed, and the production process is simple.

Further, blow vent 310 on the box bottom plate is provided with a plurality ofly, the position of every blow vent 310 and the position one-to-one of electricity core 400, thereby when a certain electricity core 400 takes place the thermal runaway, the PET membrane of this electricity core 400 below at first melts, high-temperature gas diffuses the second from the blow vent 310 of this electricity core 400 below and holds the chamber, with this when preventing single electricity core 400 thermal runaway, high-temperature gas stretches to other electricity cores 400, cause the influence to other electricity cores 400, thereby effectively avoid the damage of whole battery package. It is understood that the vent 310 may be circular, square or other shapes, in this embodiment, the vent 310 is circular, and the diameter of the vent 310 is smaller than the diameter of the battery cell 400, so as to support the battery cell 400, and the battery cell 400 does not fall into the second cavity from the vent 310.

Referring to fig. 2, the plurality of battery cells 400 and the plurality of air vents 310 are arranged in a row along the length direction of the case, and ribs 320 are disposed between two adjacent rows of air vents 310 on the bottom plate. The setting of fin 320 separates a plurality of blow vents 310 according to the row, forms gas passage, holds the high-temperature gas of intracavity for the flow direction second and plays the guide effect, when preventing that single electric core 400 from taking place thermal runaway, high-temperature gas diffusion holds whole second and holds the chamber, leads to other electric core 400 to heat up, simultaneously, shortens high-temperature gas's discharge path, is favorable to high-temperature gas to discharge from relief valve 600 fast. Further, after first case lid 100 and box are connected, fin 320 and first case lid 100 butt to can prevent better that high temperature gas from holding the chamber to whole second and loosing, do benefit to high temperature gas and discharge fast. The ribs 320 may be integrally formed with the housing 300 or bonded to the bottom plate of the housing 300, although other attachment means may be used. In this embodiment, the battery cell 400 is provided with six rows, correspondingly, the vent 310 is provided with six rows, and the ribs 320 are provided with five rows, in other embodiments, the numbers of the battery cell 400, the vent 310, and the ribs 320 may be set according to actual needs.

It will be appreciated that the pressure relief valve 600 should be provided on the side wall of the tank in front of the outlet of the gas passage, so as to facilitate the discharge of the high-temperature gas from the pressure relief valve 600. With continued reference to fig. 2, in order to provide the pressure relief valve 600, an inner side plate is provided in the box body, and a space for accommodating the pressure relief valve 600 is formed between the inner side plate and the side plate of the box body, so that the installation of the pressure relief valve 600 is facilitated. In this embodiment, the gas passage has only one outlet which leads to a pressure relief valve 600 in the side wall of the tank. In other embodiments, both ends of the gas channel may be used for discharging high-temperature gas, and accordingly, the pressure relief valve 600 may be disposed on both side plates opposite to the two outlets. Alternatively, the pressure relief valve 600 is threaded onto the side wall of the tank and opens automatically when the hot gas in the second chamber reaches a certain pressure.

When a certain electric core 400 of the battery pack is out of thermal runaway, the overflowing high-temperature gas can melt the PET film at the bottom of the battery pack, and then the high-temperature gas flows out of the first accommodating cavity through the vent 310 below the electric core 400 and diffuses in the second accommodating cavity along the gas channel to be discharged from the pressure release valve 600. Outside this high-temperature gas when battery package thermal runaway can the quick discharge battery box, when can effectively preventing single electric core 400 thermal runaway, high-temperature gas stretches to other electric cores 400, causes other electric cores 400 also together to take place thermal runaway, effectively prevents the damage of whole battery package, and the security is high.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. This need not be, nor should it be exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery pack, comprising:

the battery box comprises a box body and a first box cover (100), wherein a first containing cavity is arranged in the box body; the first box cover (100) is connected with the box body in a sealing mode to form a second containing cavity;

a plurality of battery cells (400), wherein the plurality of battery cells (400) are fixed in the first cavity;

the insulating film (500) is arranged on a bottom plate of the box body, a vent hole (310) is formed in the bottom plate of the box body, the insulating film (500) is laid between the battery cell (400) and the bottom plate and used for sealing the vent hole (310), and high-temperature gas generated when the battery cell (400) is out of control due to heat can melt the insulating film (500) and enters the second cavity from the first cavity through the vent hole (310);

the pressure relief valve (600), the pressure relief valve (600) set up on the lateral wall of box, the high temperature gas in second appearance chamber can pass through pressure relief valve (600) are discharged.

2. The battery pack according to claim 1, wherein the insulating film (500) is a PET film.

3. The battery pack according to claim 1, wherein the insulating film (500) is fixedly connected to a bottom plate of the case.

4. The battery pack according to claim 1, wherein the number of the vent holes (310) is multiple, and the positions of the vent holes (310) correspond to the positions of the battery cells (400) one by one.

5. The battery pack according to claim 4, wherein the plurality of battery cells (400) and the plurality of vent holes (310) are arranged in a row along the length direction of the box body, and ribs (320) are arranged between two adjacent rows of vent holes (310) on the outer side of the bottom plate to form gas channels.

6. A battery pack, as claimed in claim 5, wherein the pressure relief valve (600) is located on a side wall of the case forward of the gas passage outlet.

7. The battery pack according to any one of claims 1 to 6, wherein the plurality of battery cells (400) are fixedly bonded by glue.

8. The battery pack according to any one of claims 1 to 6, wherein a first sealing strip (800) is provided between the first cover (100) and the case body.

9. The battery pack according to any one of claims 1 to 6, wherein the case body comprises a second cover (200) and a housing (300), and the second cover (200) is hermetically connected to the housing (300).

10. The battery pack according to claim 9, wherein a second sealing strip (700) is provided between the second cover (200) and the housing (300).