KR101831817B1 - Battery pack for a vehicle having gas discharge means and pressure compensating means - Google Patents

Battery pack for a vehicle having gas discharge means and pressure compensating means Download PDF

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Publication number
KR101831817B1
KR101831817B1 KR1020150039041A KR20150039041A KR101831817B1 KR 101831817 B1 KR101831817 B1 KR 101831817B1 KR 1020150039041 A KR1020150039041 A KR 1020150039041A KR 20150039041 A KR20150039041 A KR 20150039041A KR 101831817 B1 KR101831817 B1 KR 101831817B1
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KR
South Korea
Prior art keywords
venting
disk
gas
bracket
disc
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KR1020150039041A
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Korean (ko)
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KR20160112768A (en
Inventor
김태욱
이복건
김태근
Original Assignee
주식회사 엘지화학
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Priority to KR1020150039041A priority Critical patent/KR101831817B1/en
Publication of KR20160112768A publication Critical patent/KR20160112768A/en
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/10Mountings; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M2/1016Cabinets, cases, fixing devices, adapters, racks or battery packs
    • H01M2/1072Cabinets, cases, fixing devices, adapters, racks or battery packs for starting, lighting or ignition batteries; Vehicle traction batteries; Stationary or load leading batteries
    • H01M2/1083Fixing on vehicles
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2/00Constructional details or processes of manufacture of the non-active parts
    • H01M2/12Vent plugs or other mechanical arrangements for facilitating escape of gases
    • H01M2/1252Vent plugs or other mechanical arrangements for facilitating escape of gases comprising elongated, tortuous or labyrinth-shaped exhaust passages in the battery cover or case; Double cover vent systems
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00Safety devices for primary or secondary batteries
    • H01M2200/20Pressure-sensitive devices
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00Batteries for particular applications
    • H01M2220/20Batteries in motive systems, e.g. vehicle, ship, plane
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

The battery pack for a vehicle according to the present invention comprises a battery module having a plurality of secondary batteries, a lower case, and an upper case coupled to the lower case to form an internal space for accommodating the battery module, And the other side of the pack case is connected to an exhaust pipe that is extended to be exposed to the outside of the vehicle so that gas is blown out of the battery module when the gas is generated in the battery module, Unit, and the gas venting unit may include a venting disk assembly configured to rupture a part when gas pressure inside the pack case exceeds a reference value.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery pack for a vehicle having gas discharging means and internal and external pressure compensating means,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a battery pack for a vehicle, and more particularly, to a battery pack for a vehicle in which gas generated inside a battery pack can be quickly discharged to the outside of the vehicle without entering the room of the vehicle.

Secondary batteries having high electrical characteristics such as high energy density and high ease of application according to the product group can be applied not only to portable devices but also to electric vehicles (EVs) or hybrid electric vehicles (HEVs) driven by electric driving sources, Storage devices (Energy Storage System) and so on. Such a secondary battery is not only a primary advantage that the use of fossil fuel can be drastically reduced, but also produces no by-products resulting from the use of energy, and thus is attracting attention as a new energy source for enhancing environmental friendliness and energy efficiency.

A battery pack applied to an electric vehicle or the like has a structure in which a plurality of cell assemblies including a plurality of unit cells are connected in series in order to obtain high output. The unit cell includes a positive electrode and a negative electrode current collector, a separator, an active material, an electrolyte, and the like, and can be repeatedly charged and discharged by an electrochemical reaction between the components.

The secondary battery constituting the unit cell may be a nickel-cadmium battery, a nickel-hydrogen battery, a lithium secondary battery, or the like. Particularly, the lithium secondary battery has an operating voltage of about 3.6 V and has a larger capacity than a nickel-cadmium battery or a nickel-hydrogen battery, which is widely used as a power source for electronic equipment, and has a high energy density per unit weight. As shown in Fig.

The lithium secondary battery can be classified into a can-type secondary battery in which an electrode assembly is embedded in a metal can, and a pouch-type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, depending on the shape of the battery case. In recent years, preference for pouch-type secondary batteries is high. The pouch-type secondary battery is advantageous in that it is light in weight, has a low possibility of electrolyte leakage, and has flexibility in shape, thereby realizing a secondary battery of the same capacity with a smaller volume and mass.

On the other hand, since such a secondary cell employs a mechanism based on an electrochemical reaction as an essential driving principle, there is a possibility that a chemical explosion may be caused by various causes such as a short circuit between electrodes, electrolyte leakage, It is known that it can not be ruled out.

For example, when the overcurrent flows, the secondary battery generates heat by joule heat, and the internal temperature of the battery rapidly rises. A rapid rise in temperature may cause a decomposition reaction of the electrolyte, and gas may be generated. In this case, a swelling phenomenon, which is a type of component phenomenon, may occur due to an increase in the pressure inside the battery case, which may cause a serious problem such as explosion of the secondary battery. In order to solve this problem, the secondary battery may further include means for discharging the gas generated inside the battery case to the outside to lower the internal pressure.

However, in the case of an electric vehicle, the gas discharged to the outside of the battery case may be introduced into the passenger compartment of the vehicle through the cooling duct of the battery pack or the like. Such a gas introduced into the passenger compartment may be fatal to the safety of the passenger. Therefore, there is a need for a safety measure to prevent gas from entering the passenger compartment.

(1) Korean Patent Laid-Open No. 10-2011-0109794 (October 10, 2011). (2) Korean Patent Publication No. 10-2014-0147546 (Jan. 30, 2014).

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an electric vehicle capable of efficiently discharging gas, which may be generated in a battery pack of an electric vehicle, to the outside of the vehicle, An object of the present invention is to provide a battery pack for a vehicle.

According to the present invention, there is provided a battery module comprising a plurality of secondary batteries; A battery pack comprising: a pack case having a lower case and an upper case coupled to the lower case, the case having an inner space for receiving the battery module and a gas outlet at one side; And a gas vent connected to the outside of the pack case so as to cover the gas exhaust port and connected to an exhaust pipe extending to the outside of the vehicle so as to cover the gas exhaust port, Unit, and the gas venting unit may be provided with a vending disk assembly including a venting disk assembly configured such that a part thereof is ruptured when a gas pressure inside the pack case exceeds a reference value.

Wherein the venting disc assembly is formed in a plate shape having a through hole and is coupled to the outside of the pack case so that the through hole is positioned to correspond to the gas discharge port; And a venting disc coupled to the venting bracket to shield the vent hole, and to be ruptured when a predetermined pressure is applied thereto.

Wherein the venting disk comprises: a disk outer periphery portion clamped on the venting bracket; And a disc inner peripheral portion formed as one body with the disc outer peripheral portion and covering the through hole.

The inner peripheral portion of the disc may be formed of a rupturable metal or plastic material when a predetermined pressure is applied thereto.

Wherein the venting disc assembly includes: a disc holder for pressing the outer periphery of the disc to fix the disc to the venting bracket; And a disk pad interposed between the disk outer circumferential portion and the venting bracket.

The inner peripheral portion of the disk may have at least one notch formed by being partially cut in the thickness direction from the surface.

The notches may be formed in the form of two arc-shaped curves symmetrical to each other.

The venting disk may have a plate shape, and may have any one of a circle, an ellipse, and a polygonal shape.

The venting disc assembly may further include at least one pressure compensating member which is press-fitted to the through hole formed to penetrate the venting bracket and through which the air is passed to compensate the pressure inside the pack case against external pressure .

The venting bracket may further include a groove portion recessed by a predetermined depth from an upper end surface of the venting bracket, and the venting disc and the pressure compensating member may be installed in the groove portion.

The venting disc and the pressure compensating member may be provided so as not to protrude from the upper surface of the venting bracket.

The venting disc assembly may further include a sealing member, wherein the venting bracket further includes a groove between the edge and the groove, and the sealing member may be interposed in the groove.

The gas venting unit includes a coupling part formed to have an inner diameter corresponding to the groove part and detachably coupled to a lower portion of the venting bracket, a coupling part extending from the coupling part in the form of a pipe and connected to the exhaust pipe, And a venting pipe provided with the venting pipe.

The gas venting unit may further include a sealing member sealing the space between the lower portion of the venting bracket and the venting pipe.

According to another aspect of the present invention, an automobile including the aforementioned battery pack for a vehicle may be provided. The automobile may include a hybrid vehicle, a plug-in hybrid vehicle, and a pure electric vehicle driven only by an electric motor and a battery without an internal combustion engine.

According to an aspect of the present invention, gas that may be generated in a battery pack of an electric vehicle is effectively discharged to the outside of the vehicle, thereby preventing explosion of the battery pack and safety of the passenger.

According to another aspect of the present invention, there is further provided a pressure equalizing device for reducing a pressure difference between the inside and outside of the battery pack case at a normal time, thereby preventing deformation of the battery pack even in a severe pressure change environment.

1 is a perspective view of a battery pack according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main portion of the battery pack according to an embodiment of the present invention, viewed from the lower side to the upper side.
3 is an assembled perspective view of the gas venting unit of Fig.
Figure 4 is an exploded perspective view of the gas venting unit of Figure 2;
5 is a cross-sectional view of the gas venting unit of Fig.
6 is a top view of the venting disk of Fig.
7 is a side view of the venting disk of Fig.
8 is a sectional view of the pressure compensating member of Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be construed as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

The embodiments of the present invention are provided to explain the present invention more fully to the ordinary artisan, so that the shape and size of the components in the drawings may be exaggerated, omitted or schematically shown for clarity. Thus, the size or ratio of each component does not entirely reflect the actual size or ratio.

FIG. 1 is a perspective view of a battery pack according to an embodiment of the present invention, and FIG. 2 is a perspective view of a main part of the battery pack according to an embodiment of the present invention, viewed from the lower side to the upper side.

Referring to these drawings, a vehicle battery pack 10 according to an embodiment of the present invention includes a battery module (not shown), a pack case 100, and a gas venting unit 200.

First, the battery module will be briefly described. The battery module may include a cell assembly assembly (not shown) composed of a plurality of pouch type secondary cells and a cartridge for guiding assembly thereof, and electrical components (not shown) mounted around the cell assembly.

The cartridge can be configured to hold the pouch type secondary battery to prevent the pouch type secondary battery from stacking and to be stacked up and down. For reference, the pouch-type secondary battery is exemplified as the secondary battery in the present embodiment, but the scope of the present invention is not necessarily limited thereto.

The electrical components may include at least one of a BMS, a current sensor, a relay, and a fuse. Here, the BMS (Battery Management System) refers to a battery management apparatus that controls overall charge / discharge operation of the battery pack 10, and the BMS may be a component that is typically included in the battery pack 10.

The current sensor is a component for sensing the charging and discharging current of the battery pack 10. The relay is a switching part that selectively opens and closes the charging and discharging path through which the charging and discharging current of the battery pack 10 flows. Also, the fuse is provided on the charging / discharging path of the battery pack 10, and is a component that blocks the flow of charge / discharge current when the battery pack 10 is malfunctioned. These current sensors, relays and fuses can exchange information with the BMS and can be controlled by the BMS.

Since the BMS, the current sensor, the relay, and the fuse itself are obvious to those skilled in the art, detailed description of each component will be omitted herein.

Such a battery module can be mounted inside the pack case 100 and accommodated therein. The pack case 100 according to the present invention may include a lower case 120 and an upper case 110. The lower case 120 and the upper case 110 may be coupled to each other in a bolt-fastening manner or the like. At this time, an O-ring may be further provided on the face of the lower case 120 and the upper case 110 to enhance airtightness.

In addition, the pack case 100 according to the present invention has a gas outlet (not shown). Here, the gas outlet may refer to a part of the perforated pack case 100.

Since the specific gravity of the harmful gas generated in the secondary battery is generally larger than that of air, it is advantageous in terms of gas discharge that the gas discharge port is located in the lower case 120. However, the scope of the present invention is not limited thereto. That is, the position of the gas discharge port may be different from that of the present embodiment depending on the structure and characteristics of the vehicle to which the battery pack 10 is applied.

On the other hand, the gas venting unit 200 may be configured to shield the gas discharge port at normal times and to communicate with the gas discharge port in an emergency. Hereinafter, the gas venting unit 200 will be described in detail.

Fig. 3 is an exploded perspective view of the gas venting unit of Fig. 2, Fig. 4 is an exploded perspective view of the gas venting unit of Fig. 2, Fig. 7 is a side view of the venting disk of Fig. 4, and Fig. 8 is a sectional view of the pressure compensating member of Fig.

3 to 5, a gas venting unit 200 according to the present invention includes a venting disc assembly 210 coupled to a pack case 100, a venting pipe 210 connected to an exhaust pipe (not shown) (Not shown).

2, the venting disc assembly 210 is mounted on a lower surface of the lower case 120 to cover the gas exhaust port, and includes a venting bracket 211 and a venting disc 212 ).

The venting bracket 211 may be provided in the form of a plate having a through hole 211a at the center thereof and a bolt fastening hole 211d formed at the edge thereof. The venting bracket 211 can be directly bolted to the lower surface of the lower case 120 through the bolt fastening hole 211d while the venting disc 212 is fixed to the body.

The venting bracket 211 supports the venting disc 212 such that the venting disc 212 can be exposed to the internal environment of the pack case 100 through the gas outlet while the upper end faces the outer wall surface of the lower case 120 They can be combined face to face.

The venting bracket 211 further includes a plurality of pipe coupling grooves (not shown) at a lower portion thereof and is screwed into the venting pipe 220 through a screw hole 221a formed in the outer circumferential portion of a venting pipe 220 .

The venting bracket 211 according to the present embodiment may further include a groove portion 211b recessed by a predetermined depth from the top surface. 3 and 4, the groove portion 211b forms a single layer along the circumferential direction of the through hole 211a with the upper surface of the venting bracket 211 and the through hole 211a as the center. The venting disc 212 may be seated in the groove 211b.

Particularly, the single layer may have a height such that the venting disc 212 does not protrude above the upper surface of the venting bracket 211 when the venting disc 212 is seated in the groove 211b.

According to the groove portion 211b, the venting disc 212 can be disposed lower than the upper end surface of the venting bracket 211, so that the upper end surface of the venting bracket 211 faces the outer wall surface of the lower case 120 Can be combined. The venting disc 212 does not protrude from the upper surface of the venting bracket 211 even if the gas outlet is smaller than the diameter of the venting disc 212. Therefore, As shown in FIG.

In addition, the venting bracket 211 may further include a groove 211c between the top edge and the groove 211b. Specifically, the groove 211c may be formed to form a closed-loop path and a sealing member 215a of rubber material may be inserted into the groove 211c.

The sealing member 215a inserted into the groove 211c may enhance airtightness between the venting bracket 211 and the pack case 100. [

The grooves 211c may be equally applied to not only the upper portion but also the lower portion of the venting bracket 211. [ That is, the venting pipe 220 to be described later can be engaged or disengaged at the lower portion of the venting bracket 211, so that the groove 211c is formed in the lower portion of the venting bracket 211, and the sealing member 215b is inserted, .

The venting disc 212 is a part that is seated in the groove 211b described above so as to cover the through hole 211a of the venting bracket 211. When the internal pressure of the pack case 100 exceeds the reference value, .

When the venting disc 212 is ruptured, the vent hole 211a of the venting bracket 211 is opened. At this time, due to the difference between the pressure inside the pack case 100 and the external atmospheric pressure, The gas generated in the vent hole 211a can be smoothly discharged to the outside of the vehicle along the venting pipe 220 communicated with the through hole 211a.

The venting disc 212 may include a disc outer circumferential portion 212a and an inner disc portion 212b.

6 and 7, the disk outer circumferential portion 212a and the disk inner circumferential portion 212b may be a disk-shaped plate body formed integrally with one body, and the disk outer circumferential portion 212a may be a disk inner circumferential portion 212b, May be disposed on the upper surface of the venting bracket 211, specifically, the groove 211b so as to cover the through hole 211a.

The disk outer circumferential portion 212a may further include a fastener H along the circumferential direction. The venting disc 212 may be fixed to the venting bracket 211 in a bolt-fastening manner through a fastener H formed in the outer periphery of the disc.

At this time, the venting disc assembly 210 may further include a disc holder 213 and a disc pad 214 so that the fastening of the venting disc 212 may be more stable. In this embodiment, the disc holder 213 and the disc pad 214 may be provided in an annular or ring shape corresponding to the disc outer circumferential portion 212a.

The disk holder 213 is brought into surface contact with the disk outer circumferential portion 212a when the bolt is fastened, so that the disk outer circumferential portion 212a receives a uniform pressing force as a whole. Accordingly, the disk outer circumferential portion 212a can be bound to the venting bracket 211 more stably. The disk holder 213 may be made of an annular stainless steel or the like, but it may be made of a metal or a plastic material having high mechanical rigidity.

The disc pad 214 is interposed between the venting bracket 211 and concretely the groove portion 211b and the disc outer circumferential portion 212a to prevent breakage of the disc outer circumferential portion 212a and bolster the airtightness. The disc pad 214 may be made of a rubber material having elasticity and attracting force, for example.

The inner peripheral portion 212b of the disk is ruptured when a predetermined pressure is applied to the venting disk 212, and may be formed of a thin aluminum or plastic material. Of course, the scope of the present invention is not limited thereto. That is, the inner peripheral portion 212b of the disk may be any material as long as it can be ruptured by a predetermined pressure.

The disk inner peripheral portion 212b blocks the penetration hole 211a and the gas discharge port of the venting bracket 211 to prevent moisture or foreign matter from penetrating into the pack case 100 when the vehicle is running normally.

However, if a large amount of gas is generated in the battery pack, the inner peripheral portion 212b of the disk may be ruptured so that the gas can be taken out of the vehicle. In other words, the gas generated in the secondary batteries raises the pressure inside the pack case 100, and the pressure thus raised acts as a force to rupture the inner peripheral portion 212b. Accordingly, when the disk inner peripheral portion 212b is ruptured, the through hole 211a is opened and the gas discharge port and the venting pipe 220 are communicated with each other. At this time, since the pressure inside the pack case 100 is higher than the atmospheric pressure, the gas inside the pack case 100 can be quickly discharged to the outside of the vehicle by the negative pressure.

The inner peripheral portion 212b of the disc may have at least one notch 212c formed by being partially cut in the thickness direction from the surface. The notch 212c is a portion that induces the inner peripheral portion 212b of the disk to be easily ruptured by a predetermined pressure.

The notch 212c of the inner peripheral portion 212b according to the embodiment of the present invention is formed so as to have two arcuate curved shapes symmetrical to each other on the inner peripheral portion 212b of the disk as shown in Fig. . Of course, the scope of the present invention is not necessarily limited thereto. That is, the notch 212c of the inner peripheral portion 212b may have various shapes.

In this embodiment, by forming two notches 212c in this manner, when the disk inner peripheral portion 212b is ruptured, two disk-shaped openings can be formed without completely separating the disk inner peripheral portion 212b . If the inner peripheral portion 212b of the disc ruptures and completely falls off, it may be left on the exhaust pipe of the vehicle without escaping to the outside of the vehicle, which is difficult to remove and may damage the exhaust pipe due to the metal material.

The venting pipe 220 is mounted on the lower portion of the venting disc assembly 210, specifically, the venting bracket 211 as described above. The venting pipe 220 is connected to the exhaust pipe inside the vehicle, A gas flow path for discharging the gas of the gas to the outside of the vehicle is formed.

The venting pipe 220 according to the present invention may be connected to an exhaust pipe separately installed in the vehicle, though it is not illustrated in detail for the sake of convenience of illustration. However, the scope of the present invention is not necessarily limited thereto. For example, the vent pipe 220 may be configured to extend outside the vehicle and be directly exposed to the outside.

The venting pipe 220 includes a coupling part 221 formed to have an inner diameter corresponding to the groove part 211b of the venting bracket 211 and detachably coupled to the lower part of the venting bracket 211, And a connection portion 222 extending from the coupling portion 221 and connected to the exhaust pipe of the vehicle.

As described above, since the venting pipe 220 is configured to be detachable from the venting disc assembly 210, the vehicle battery pack 10 of the present invention is installed in the vehicle and periodically checks the state of the venting disc 212, It can be easy.

Meanwhile, the gas venting unit 200 according to the present invention may further include a pressure compensating member 216 for maintaining a pressure balanced state by reducing a pressure difference between the case and the outside of the case of the battery pack 10 normally.

For example, when the internal pressure of the battery pack 10 itself is lowered due to the closed structure, or when the vehicle travels in a high mountain area where the atmospheric pressure is low, the pressure difference between the inside and the outside of the battery pack 10 may become large. In this case, since the battery pack 10 may be distorted or cracked due to a difference in air pressure, it is important to maintain the pressure balance in and out of the battery pack 10.

Accordingly, the pressure compensating member 216 according to the present invention performs a function of adjusting the pressure inside and outside the battery pack 10 so that the battery pack 10 can be prevented from being deformed even in an environment of severe pressure change.

In this embodiment, the pressure compensating member 216 may be configured to be press-fit-engaged with a through hole (not shown) formed to penetrate the venting bracket 211.

Specifically, the pressure compensating member 216 may include a membrane 216a provided in a membrane form, and a housing 216b on which the membrane 216a is mounted. Here, the membrane 216a may be a membrane structure that is impermeable to liquids and permeable to gases.

The housing 216b has a ventilation structure to allow gas to pass through the membrane 216a and may include a connector 216c to be mounted on the venting bracket 211 as shown in FIG. The connector 216c comes out of the upper end surface of the groove portion 211b of the venting bracket 211 through the through hole in a state in which the end of the end portion of the venting bracket 211 is hooked up, And may be configured to be engaged with the surface. At this time, the lower end of the housing 216b may be exposed to the lower portion of the venting bracket 211. [ The coupling part 221 of the venting pipe 220 may further include a clearance space 221a for receiving the lower end of the housing 216b so as to allow air to flow in and out through the pressure compensating member 216.

In this embodiment, the pressure compensating member 216 may be mounted together in the groove portion 211b at a position adjacent to the venting disc 212. [ Therefore, the vehicle battery pack 10 according to the present invention having such a structure can have higher peripheral space availability and simpler structure than the pressure compensating member 216 provided at a separate position, Additional costs can also be reduced.

The vehicle battery pack according to the present invention can be applied to an automobile such as an electric car or a hybrid car. That is, the vehicle according to the present invention may include the battery pack for a vehicle according to the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood that various modifications and changes may be made without departing from the scope of the appended claims.

In the present specification, terms indicating upward, downward, leftward, rightward, forward, and backward directions are used, but these terms are for convenience of explanation only and may vary depending on the position of an object or the position of an observer It will be apparent to those skilled in the art that the present invention is not limited thereto.

10: Battery pack for vehicle
100: pack case 110: upper case
120: lower case 200: gas venting unit
210: Venting disc assembly 211: Venting bracket
212: Venting disc 213: Disc holder
214: disc pad 215: sealing member
216: pressure compensating member 220: venting pipe
221: fastening part 222:

Claims (15)

  1. A battery module having a plurality of secondary batteries;
    A battery pack comprising: a pack case having a lower case and an upper case coupled to the lower case, the case having an inner space for receiving the battery module and a gas outlet at one side; And
    And a gas venting unit connected to an exhaust pipe extending from the other side of the pack case so as to cover the gas exhaust port so as to expose the outside of the vehicle, / RTI >
    The gas venting unit includes:
    A venting bracket formed in a plate shape having a through hole and coupled to the outside of the pack case such that the through hole is positioned to correspond to the gas outlet;
    A venting disk coupled to the venting bracket to shield the vent hole and to rupture when a predetermined pressure is applied; And
    A membrane that is impermeably coupled to the through hole formed to penetrate through the venting bracket at a position adjacent to the venting disc and is impermeable to liquid and permeable to gas, And a venting disc assembly composed of a compensating member.
  2. delete
  3. The method according to claim 1,
    Wherein the venting disk comprises:
    A disk outer periphery portion clamped on the venting bracket; And
    And a disc inner peripheral portion formed as one body with the outer peripheral portion of the disc and covering the through hole.
  4. The method of claim 3,
    Wherein the inner peripheral portion of the disk is formed of a rupturable metal or plastic material when a predetermined pressure is applied thereto.
  5. The method of claim 3,
    Wherein the venting disc assembly comprises:
    A disk holder which presses the disk outer circumferential portion to fix the disk outer circumferential portion to the venting bracket; And
    And a disk pad interposed between the disk outer circumferential portion and the venting bracket.
  6. The method of claim 3,
    Wherein the inner peripheral portion of the disk has at least one notch formed by being partially cut from the surface in the thickness direction.
  7. The method according to claim 6,
    Characterized in that the notches are formed in the shape of two arc curves symmetrical to each other.
  8. The method according to claim 1,
    Wherein the venting disk is a plate-shaped one of a circle, an ellipse, and a polygonal shape.
  9. delete
  10. The method according to claim 1,
    The venting bracket
    Further comprising a groove portion formed to be recessed by a predetermined depth from the upper surface,
    And the ventilation disc and the pressure compensating member are provided in the groove portion.
  11. 11. The method of claim 10,
    Wherein the venting disk and the pressure compensating member are provided so as not to protrude from the upper surface of the venting bracket.
  12. 11. The method of claim 10,
    Wherein the venting disc assembly further comprises a sealing member,
    Wherein the venting bracket further comprises a groove between an edge and the groove, and the sealing member is interposed between the groove and the groove.
  13. 11. The method of claim 10,
    The gas venting unit includes:
    A venting pipe formed to have an inner diameter corresponding to the groove portion and detachably coupled to a lower portion of the venting bracket and a connecting portion extending from the coupling portion in the form of a pipe and connected to the exhaust pipe, Wherein the battery pack further comprises:
  14. 14. The method of claim 13,
    The gas venting unit includes:
    Further comprising a sealing member sealing the lower portion of the venting bracket and the venting pipe.
  15. An automobile comprising the battery pack for a vehicle according to any one of claims 1, 3 to 8, and 10 to 14.
KR1020150039041A 2015-03-20 2015-03-20 Battery pack for a vehicle having gas discharge means and pressure compensating means KR101831817B1 (en)

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WO2019088474A1 (en) * 2017-10-30 2019-05-09 삼성에스디아이 주식회사 Battery ventilation device and battery comprising same
KR20190122474A (en) 2018-04-20 2019-10-30 주식회사 엘지화학 Battery Pack with degassing flow path

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003157821A (en) * 2001-11-22 2003-05-30 Japan Storage Battery Co Ltd Pressure-compensated battery
EP1921020A1 (en) 2006-11-10 2008-05-14 Robert Bosch Gmbh Pressure compensation element for a casing
JP2012084422A (en) * 2010-10-13 2012-04-26 Hitachi Vehicle Energy Ltd Power storage module and power storage device
JP2013089375A (en) * 2011-10-14 2013-05-13 Nissan Motor Co Ltd Vent plug of sealed battery

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003157821A (en) * 2001-11-22 2003-05-30 Japan Storage Battery Co Ltd Pressure-compensated battery
EP1921020A1 (en) 2006-11-10 2008-05-14 Robert Bosch Gmbh Pressure compensation element for a casing
JP2012084422A (en) * 2010-10-13 2012-04-26 Hitachi Vehicle Energy Ltd Power storage module and power storage device
JP2013089375A (en) * 2011-10-14 2013-05-13 Nissan Motor Co Ltd Vent plug of sealed battery

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