KR102075101B1 - Battery pack improved in cooling structure - Google Patents

Battery pack improved in cooling structure Download PDF

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Publication number
KR102075101B1
KR102075101B1 KR1020160101935A KR20160101935A KR102075101B1 KR 102075101 B1 KR102075101 B1 KR 102075101B1 KR 1020160101935 A KR1020160101935 A KR 1020160101935A KR 20160101935 A KR20160101935 A KR 20160101935A KR 102075101 B1 KR102075101 B1 KR 102075101B1
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KR
South Korea
Prior art keywords
case
pack
cells
plurality
coolant
Prior art date
Application number
KR1020160101935A
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Korean (ko)
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KR20180017695A (en
Inventor
서성원
문정오
이윤구
최미금
Original Assignee
주식회사 엘지화학
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Priority to KR1020160101935A priority Critical patent/KR102075101B1/en
Publication of KR20180017695A publication Critical patent/KR20180017695A/en
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Publication of KR102075101B1 publication Critical patent/KR102075101B1/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
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/61Types of temperature control
    • H01M10/613Cooling or keeping cold
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/655Solid structures for heat exchange or heat conduction
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/60Heating or cooling; Temperature control
    • H01M10/65Means for temperature control structurally associated with the cells
    • H01M10/656Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6569Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
    • 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
    • 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
    • Y02E60/122Lithium-ion batteries

Abstract

The present invention provides a plurality of cells arranged at a predetermined interval; A pack case having an inner space for accommodating the plurality of cells; Disclosed is a battery pack comprising: a coolant flowing into an inner space of the pack case and in direct contact with the cell and causing a phase change from a liquid state to a gaseous state due to a temperature increase of the cell.

Description

BATTERY PACK IMPROVED IN COOLING STRUCTURE}

The present invention relates to a battery pack in which a coolant is used, and more particularly, to a battery pack having a structure for supplying a coolant to a case accommodating a cell to prevent a temperature increase of the cell.

Lithium secondary batteries are widely applied to fields requiring high energy, such as automobile batteries or power storage devices, because a plurality of unit cells are bundled into one pack.

However, a battery pack including a plurality of unit cells causes swelling with heat generation during overcharging and convexly expands outwardly of the module.

In order to cool the battery pack as described above, a cooling passage is generally provided inside the case of the battery pack to allow heat exchange by flowing cooling water. In this regard, Patent Document 1 discloses a heat dissipation unit of a battery cell in which a plurality of battery cells and a heat dissipation module are heat-exchanged in close contact with each other, thereby improving heat exchange efficiency and achieving stable heat dissipation of the battery cells.

In addition, Patent Document 2 has a structure to enable a flow path for delivering the coolant in a uniform and well-distributed manner, consisting of rubber sheets of the front and rear cover that can change the flow direction of the coolant, A power battery pack cooling apparatus is disclosed that provides a path for flow across an array.

However, in the conventional battery cooler, not only the internal structure is complicated, but also because the cooling water is supplied through the cooling tube or the cooling duct, the temperature of the battery cell is determined by factors such as an event occurrence of the battery cell, that is, overcharge. There is a vulnerability that results in poor cooling performance when an excessive rise in temperature occurs.

Patent Document 1: Korean Unexamined Patent Publication No. 2013-0064969 Patent Document 2: Korean Unexamined Patent Publication No. 2013-0105653

The present invention has been made in view of the above problems, and an object thereof is to provide a battery pack having a structure for improving cooling efficiency by using a phase change of a cooling liquid.

Another object of the present invention to provide a battery pack having a structure that can smoothly discharge the cooling gas generated by the phase change to the outside.

The present invention to achieve the above object is a plurality of cells arranged at a predetermined interval; A pack case having an inner space for accommodating the plurality of cells; And a coolant flowing into an inner space of the pack case and in direct contact with the cell and causing a phase change from a liquid state to a gas state by an increase in temperature of the cell.

The pack case may include a case main body having a bottom surface capable of supporting the plurality of cells, and an upper cover which is tightly coupled to the case main body.

At least one of the rectangular case portion and the cover portion may be formed with a lattice rib structure for imparting rigidity.

One side of the pack case may be provided with a coolant inlet tube communicating with the inner space, the other side may be provided with a coolant outlet tube communicating with the inner space.

The pack case may be sealed while the coolant is introduced.

The pack case may be provided with a venting valve for discharging the gas generated by the phase change to the outside of the pack case.

At least a part of the pack case may be made of a Gore-tex material that can discharge the gas generated by the phase change to the outside of the pack case.

As the cooling liquid, cooling water or insulating oil having a boiling point of 150 ° C. or more may be introduced.

The plurality of cells may be arranged in a matrix at predetermined intervals.

According to another aspect of the present invention, there is provided a plurality of cells arranged at predetermined intervals and an internal space for accommodating the coolant directly contacting the plurality of cells, at least a portion of the coolant according to the temperature rise of the cell The pack case of the battery pack is provided with a venting valve for discharging the gas generated by the phase change of the outside.

According to still another aspect of the present invention, a plurality of cells arranged at predetermined intervals and an internal space for accommodating a coolant directly contacting the plurality of cells, at least a portion of the Provided is a pack case of a battery pack, comprising a Gore-Tex material capable of discharging gas generated by a phase change of a coolant to the outside.

According to the present invention, since the temperature rise of the cell is suppressed by the phase change of the coolant in direct contact with the cell when an event of the battery cell occurs, the cooling efficiency can be improved.

In addition, the gas generated in the process of the phase change of the coolant can be discharged to the outside through the pack case to prevent the occurrence of additional events such as internal pressure rise.

The following drawings attached to this specification are illustrative of the preferred embodiments of the present invention, and together with the detailed description of the invention to serve as a further understanding of the technical spirit of the present invention, the present invention described in such drawings It should not be construed as limited to.
1 is an exploded perspective view of a battery pack according to a preferred embodiment of the present invention.
2 is a cross sectional view of FIG. 1.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the ordinary or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own inventions. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

1 is an exploded perspective view of a battery pack according to a preferred embodiment of the present invention, Figure 2 is a combined cross-sectional view of FIG.

1 and 2, a battery pack according to a preferred embodiment of the present invention directly contacts the cell 100 together with the plurality of cells 100 arranged at predetermined intervals and the plurality of cells 100. It includes a pack case 110 for receiving the cooling liquid 1 introduced to.

Each cell 100 is preferably constituted by a pouch type secondary battery, and each is sealed to prevent water from penetrating therein. The plurality of cells 100 are arranged to form a matrix pattern at predetermined intervals inside the pack case 110 so as to minimize the influence on the adjacent cells 100 when an event due to overcharge, high temperature, physical shock, etc. occurs.

The pack case 110 may be configured in various forms as a portion that wraps and supports the plurality of cells 100. In order to accommodate the plurality of cells 100 while efficiently utilizing the limited space, the pack case 110 preferably has a rectangular or square body.

The pack case 110 includes a case body 110a having a bottom surface capable of supporting a plurality of cells 100, and an upper cover 110b that is tightly coupled to the case body 110a in a watertight manner. . A sealing member such as an O-ring is interposed between the case body 110a and the top cover 110b or a fusion portion is formed for watertight coupling.

The inner space 112 of the case body 110a is partitioned by the partition wall 111 so as to individually store the cells 100. In each partitioned space, a plurality of cells 100 may be arranged in a stacked form.

The height of the space surrounded by the partition wall 111 is preferably designed to be larger than the height (thickness) of the cell 100 so as to secure a space in which the coolant 1 may be filled. Here, the partition wall 111 may also provide a function of providing rigidity to the case body 110a.

The upper cover 110b is preferably provided with a lattice rib structure 116 for imparting rigidity. In particular, when a portion of the upper cover 110b is made of a Gore-tex material, the grid-shaped rib structure 116 serves to maintain the shape of the upper cover 110b. To this end, the grid rib structure 116 is preferably made of a pattern corresponding to the partition wall formed in the grid in the case body (110a).

One side of the pack case 110 is provided with a coolant inlet tube 113 in communication with the internal space 112, the other side is provided with a coolant outlet tube 114 in communication with the internal space 112. This configuration provides a function to circulate the coolant 1 inside the pack case 110. That is, the coolant 1 introduced into the internal space 112 of the pack case 110 through the coolant inlet tube 113 directly contacts the cell 100 to provide a cooling function and to cool the coolant outlet tube 114. After discharged to the outside through the cooling can be circulated in a manner that is introduced into the coolant inlet pipe 113 again.

Alternatively, the pack case 110 may be completely sealed by sealing the edge of the pack case 110 by fusion or the like while the coolant 1 is introduced into the inner space 112. In this case, the coolant 1 maintains the state contained in the pack case 110 and contacts the cell 100 in a non-circulating manner to provide a cooling function.

In the pack case 110, for example, a venting valve 115 for discharging the gas generated by the phase change to the outside of the pack case 110 while blocking the outflow of the coolant 1 in the upper cover 110b. Is installed. Alternatively, at least a portion of the pack case 110, preferably at least a portion of the upper cover 110b, blocks the outflow of the coolant 1 while transferring the gas generated by the phase change to the outside of the pack case 110. It is also possible to use a Gore-Tex material that can be ejected.

The cell 100 disposed in the inner space of the pack case 110 typically has an operating temperature of 80 ° C. or lower in a normal state, but when an event occurs due to factors such as overcharge, high temperature, and physical shock, the temperature may be about 200 ° C. Rises. In consideration of this point, it is preferable that a cooling water or an insulating oil having a boiling point of 150 ° C. or more is introduced into the cooling liquid 1 flowing into the inner space of the pack case 110.

The coolant 1 introduced and filled into the inner space of the pack case 110 directly contacts the plurality of cells 100 to cool the heat generated in the cell 100 through circulation or latent heat of the coolant 1. Let's do it.

When an event such as overcharging occurs in the battery cell 100, the temperature of the cell 100 is excessively increased by causing the coolant 1 to undergo a phase change from the liquid state to the gas state due to the temperature increase of the cell 100. prevent.

When the phase change to vaporize the coolant 1 occurs, the temperature is adjusted so that the battery cell 100 has a cooling action to be below the event occurrence temperature and thus does not become an event situation. Since the gas generated by the phase change is discharged to the outside through the venting valve 115 or the Gore-tex material provided in the pack case 110, an additional event such as an internal pressure increase of the pack case 110 may be prevented. .

Although the present invention has been described above by means of limited embodiments and drawings, the present invention is not limited thereto and will be described below by the person skilled in the art and the technical spirit of the present invention. Of course, various modifications and variations are possible within the scope of the claims.

1: coolant 100: cell
110: pack case 113: coolant inlet pipe
114: coolant outlet pipe 115: venting valve
116: rib structure

Claims (11)

  1. A plurality of cells arranged at predetermined intervals;
    A pack case having an inner space for accommodating the plurality of cells; And
    And a coolant flowing into an inner space of the pack case to be in direct contact with the cell and causing a phase change from a liquid state to a gas state by a temperature increase of the cell.
    The pack case includes a case body having a bottom surface capable of supporting the plurality of cells, and an upper cover which is tightly coupled to an upper portion of the case body.
    The inner space of the case main body is partitioned by partition walls formed in a lattice shape inside the case main body so as to accommodate each cell individually,
    The upper cover may include a lattice rib structure formed in a pattern corresponding to the partition wall formed on the case body in a lattice shape, and a portion surrounded by the lattice rib structure may receive gas generated by the phase change in the pack case. Battery pack, characterized in that made of Gore-tex material that can be discharged to the outside.
  2. delete
  3. delete
  4. The method of claim 1,
    One side of the pack case is provided with a coolant inlet pipe communicating with the inner space, the other side is a battery pack, characterized in that the coolant outlet pipe is provided in communication with the inner space.
  5. The method of claim 1,
    The pack case is sealed, characterized in that the coolant flowed in.
  6. The method of claim 1,
    The pack case is characterized in that the vent valve for discharging the gas generated by the phase change to the outside of the pack case is installed.
  7. delete
  8. The method of claim 1,
    The battery pack, characterized in that the cooling water or the cooling oil having a boiling point of more than 150 ℃ flowed into the cooling liquid.
  9. The method of claim 1,
    The plurality of cells is a battery pack, characterized in that arranged in a matrix at a predetermined interval.
  10. delete
  11. A pack case of a battery pack having a plurality of cells arranged at predetermined intervals and an internal space for accommodating a coolant in direct contact with the plurality of cells,
    And a case body having a bottom surface capable of supporting the plurality of cells, and an upper cover which is tightly coupled to an upper portion of the case body.
    The inner space of the case main body is partitioned by partition walls formed in a lattice shape inside the case main body so as to accommodate each cell individually,
    The upper cover has a lattice rib structure formed in a pattern corresponding to a partition wall formed in the case body in a lattice shape, and a portion surrounded by the lattice rib structure receives a gas generated by a phase change from the outside of the pack case. The case of the battery pack, characterized in that made of Gore-Tex material that can be discharged.
KR1020160101935A 2016-08-10 2016-08-10 Battery pack improved in cooling structure KR102075101B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020160101935A KR102075101B1 (en) 2016-08-10 2016-08-10 Battery pack improved in cooling structure

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020160101935A KR102075101B1 (en) 2016-08-10 2016-08-10 Battery pack improved in cooling structure
CN201790000490.2U CN208401005U (en) 2016-08-10 2017-08-10 The assembly housing of battery pack and battery pack with improved cooling structure
PCT/KR2017/008703 WO2018030821A1 (en) 2016-08-10 2017-08-10 Battery pack having improved cooling structure

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KR20180017695A KR20180017695A (en) 2018-02-21
KR102075101B1 true KR102075101B1 (en) 2020-03-02

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CN (1) CN208401005U (en)
WO (1) WO2018030821A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200032995A (en) * 2018-09-19 2020-03-27 주식회사 엘지화학 Battery pack and vehicle comprising the battery pack

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200389453Y1 (en) * 2005-04-20 2005-07-18 함태흥 battery gas exhaust was possible silver- ion water occurrence device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100477948B1 (en) * 2002-07-26 2005-03-22 이현상 Cooling apparatus for electronic equipment
KR101058102B1 (en) * 2009-12-18 2011-08-24 에스비리모티브 주식회사 Battery Pack
KR20100041727A (en) * 2010-04-04 2010-04-22 임재현 The cooling and heating system for battery to control temperature
WO2012002907A1 (en) 2011-01-24 2012-01-05 Guoan Feng Power battery pack cooling apparatus
KR101199148B1 (en) * 2011-04-21 2012-11-09 에스비리모티브 주식회사 Battery module
KR101282473B1 (en) * 2011-09-21 2013-07-04 로베르트 보쉬 게엠베하 Battery pack
KR101367210B1 (en) 2011-12-09 2014-02-27 대한칼소닉주식회사 Battery cell of heat sink unit
KR101715698B1 (en) * 2014-09-22 2017-03-13 주식회사 엘지화학 Battery module comprising heat transfer device using wick for cooling part

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200389453Y1 (en) * 2005-04-20 2005-07-18 함태흥 battery gas exhaust was possible silver- ion water occurrence device

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CN208401005U (en) 2019-01-18
WO2018030821A1 (en) 2018-02-15
KR20180017695A (en) 2018-02-21

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