WO2022001382A1 - 极耳和具有其的电芯、电池模组和电池包 - Google Patents

极耳和具有其的电芯、电池模组和电池包 Download PDF

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Publication number
WO2022001382A1
WO2022001382A1 PCT/CN2021/093194 CN2021093194W WO2022001382A1 WO 2022001382 A1 WO2022001382 A1 WO 2022001382A1 CN 2021093194 W CN2021093194 W CN 2021093194W WO 2022001382 A1 WO2022001382 A1 WO 2022001382A1
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WO
WIPO (PCT)
Prior art keywords
tab
cooling
channel
piece
cooling channel
Prior art date
Application number
PCT/CN2021/093194
Other languages
English (en)
French (fr)
Inventor
吴文刚
刘彦初
周贵树
李瀚文
唐俊
Original Assignee
比亚迪股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Priority to KR1020227044100A priority Critical patent/KR20230012030A/ko
Priority to EP21833634.5A priority patent/EP4167370A1/en
Priority to JP2022571776A priority patent/JP7525653B2/ja
Publication of WO2022001382A1 publication Critical patent/WO2022001382A1/zh
Priority to US18/057,038 priority patent/US20230163428A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/647—Prismatic or flat cells, e.g. pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6553—Terminals or leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H01M10/6557—Solid parts with flow channel passages or pipes for heat exchange arranged between the cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present disclosure relates to the technical field of batteries, and in particular, to a tab and a battery cell, a battery module and a battery pack having the same.
  • the power battery pack has a large working current and a large amount of heat.
  • the temperature rise of the tabs is relatively large.
  • the temperature of the tab is high for a long time, it will affect the performance of the cell and shorten the service life of the cell.
  • an object of the present disclosure is to provide a tab, which can effectively reduce the temperature of the tab and the cell, so that the performance of the cell is more excellent and the service life of the cell is prolonged.
  • Another object of the present disclosure is to provide a battery cell with the above-mentioned tabs.
  • Another object of the present disclosure is to provide a battery module having the above-mentioned battery cells.
  • Yet another object of the present disclosure is to provide a battery pack having the above-mentioned battery cells.
  • a tab according to an embodiment of the first aspect of the present disclosure includes: a first tab; a second tab, the second tab is provided on one side of the first tab in the thickness direction, At least one cooling cavity is defined between the second pole tab and the first pole tab, and the cooling cavity is filled with a cooling medium.
  • the pole tab of the embodiment of the present disclosure by arranging the first pole tab and the second pole tab, at least one cooling cavity is defined between the second pole tab and the first pole tab, and the cooling cavity is filled with There is a cooling medium, which has a good heat dissipation effect, which can effectively reduce the temperature of the tabs and the battery core, so that the performance of the battery core is more excellent and the service life of the battery core is prolonged.
  • the tab further includes: a third tab, the third tab is disposed between the first tab and the second tab, the At least one cooling channel is formed on the third tab piece, and the cooling channel and the first tab piece and/or the second tab piece together define the cooling cavity.
  • the cooling channel runs through the third tab piece along a thickness direction of the third tab piece, and the cooling channel is connected to the first tab piece and the second pole piece.
  • the tabs collectively define the cooling cavity.
  • a side surface of the third tab sheet in the thickness direction is in contact with a side surface of the first tab sheet facing the third tab sheet; and/or the The other side surface of the third tab piece in the thickness direction is in contact with the side surface of the second tab piece facing the third tab piece.
  • the cooling channel includes: a first cooling channel, one end of the first cooling channel penetrates a side surface of the third tab; a plurality of second cooling channels, a plurality of the first cooling channel Two cooling channels are arranged at intervals along the length of the first cooling channel, one end of each second cooling channel is communicated with the first cooling channel, and the other end of each second cooling channel is along the first cooling channel.
  • the width direction of a cooling channel extends away from the first cooling channel.
  • the first cooling channel includes a first channel segment and a second channel segment connected to each other, the width of the first channel segment is greater than the width of the second channel segment, the second channel segment One end of the channel segment away from the first channel segment penetrates the side surface of the third tab piece, and the one end of the plurality of first cooling channels communicates with the first channel segment.
  • a plurality of the second cooling channels are parallel to each other and perpendicular to the first cooling channel, and the plurality of the second cooling channels are located on the same side of the first cooling channel.
  • a cell according to an embodiment of the second aspect of the present disclosure includes a cell body; a tab, the tab is the tab according to the embodiment of the first aspect of the present disclosure, and the tab is provided on the cell body , a part of the cooling cavity of the tab is located inside the battery cell body and the other part is located outside the battery core body.
  • the battery module according to the embodiment of the third aspect of the present disclosure includes the battery cell according to the embodiment of the second aspect of the present disclosure.
  • the battery pack according to the embodiment of the fourth aspect of the present disclosure includes the battery cell according to the embodiment of the second aspect of the present disclosure.
  • FIG. 1 is a perspective view of a tab according to an embodiment of the present disclosure
  • Figure 2 is an exploded view of the tab shown in Figure 1;
  • Figure 3 is a top view of the tab shown in Figure 1;
  • Fig. 4 is a sectional view along line A-A in Fig. 3;
  • FIG. 5 is an enlarged view of the B part circled in FIG. 4 .
  • 3 third tab; 4: cooling channel; 41: first cooling channel;
  • 411 the first channel segment
  • 412 the second channel segment
  • the tab 100 according to the embodiment of the first aspect of the present disclosure is described below with reference to FIGS. 1-5 .
  • the tab 100 may be applied to a cell (not shown).
  • the application of the tab 100 to a cell is taken as an example for description.
  • a tab 100 according to an embodiment of the first aspect of the present disclosure includes a first tab 1 and a second tab 2 .
  • the second tab 2 is disposed on one side of the first tab 1 in the thickness direction.
  • At least one cooling cavity 11 is defined between the second tab 2 and the first tab 1 , and the cooling cavity 11 is filled with There is cooling medium.
  • the heat generated by the cell can be transferred to the cooling cavity 11 through the parts of the first tab 1 and the second tab 2 located in the cell, and the cooling medium in the cooling cavity 11 can Absorb heat and transfer the heat to the parts of the first tab 1 and the second tab 2 located outside the cell, so that the heat generated by the cell can be dissipated to the outside of the cell, effectively reducing the temperature of the tab 100, Achieve better heat dissipation effect, so that the battery can have excellent performance under higher charge and discharge current, and prolong the service life of the battery.
  • the tab 100 of the embodiment of the present disclosure by arranging the first tab 1 and the second tab 2, and defining at least one cooling cavity between the second tab 2 and the first tab 1 11 and the cooling cavity 11 is filled with a cooling medium, which has a good heat dissipation effect, and can effectively reduce the temperature of the tab 100 and the battery core, so that the performance of the battery core is more excellent and the service life of the battery core is prolonged.
  • the tab 100 may include tab glue 5 , which is provided on surfaces of the first tab piece 1 and the second tab piece 2 that face away from each other to achieve a
  • the ear 100 is sealed with the aluminum plastic film. Therefore, the cooling medium in the cooling cavity 11 can reduce the temperature of the tab 100 and prolong the sealing life of the tab glue 5, so that the battery cell can ensure the stability of the sealing structure under higher charging and discharging current.
  • the tab 100 further includes: a third tab 3 , the third tab 3 is disposed between the first tab 1 and the second tab 2 , At least one cooling channel 4 is formed on the third tab 3 , and a cooling cavity 11 is jointly defined between the cooling channel 4 and the first tab 1 and/or the second tab 2 .
  • the cooling cavity 11 may be jointly defined by the cooling channel 4 and the first tab piece 1; alternatively, the cooling cavity 11 may also be jointly defined by the cooling channel 4 and the second tab piece 2 Of course, the cooling cavity 11 may be defined by the cooling channel 4 together with the first tab piece 1 and the second tab piece 2 .
  • the plurality of cooling cavities 11 may be jointly defined by the cooling channel 4 and the first tab piece 1; or, the plurality of cooling cavities 11 may be defined by the cooling channel 4 and the second tab piece 2 are jointly defined; alternatively, the plurality of cooling cavities 11 may be jointly defined by the cooling channel 4 and the first tab piece 1 and the second tab piece 2; or, a part of the plurality of cooling cavities 11 may be defined by the cooling channel 4
  • the channel 4 is jointly defined with the first tab piece 1
  • another part of the plurality of cooling cavities 11 is jointly defined by the cooling channel 4 and the second tab piece 2 ; of course, it can also be a part of the plurality of cooling cavities 11
  • the cooling channel 4 is jointly defined by the first tab piece 1 or the second tab piece 2
  • another part of the plurality of cooling cavities 11 is jointly defined by the cooling channel 4 and the first tab piece 1 and the second tab piece 2 . limited.
  • the third tab piece 3 can be processed and cooled.
  • the channel 4 makes the structures of the first tab 1 and the second tab 2 relatively simple, and facilitates the processing of the first tab 1 and the second tab 2 .
  • the cooling channel 4 penetrates the third tab piece 3 along the thickness direction of the third tab piece 3 , and the cooling channel 4 is connected to the first tab piece 1 and the third tab piece 3 .
  • the second tabs 2 together define a cooling cavity 11 . Therefore, since the thickness of the third tab piece 3 is generally thin, this arrangement can facilitate the processing of the cooling channel 4 while achieving effective heat dissipation of the entire tab 100 , improve processing efficiency, and shorten man-hours.
  • the present disclosure is not limited thereto, and the cooling channel 4 may also be formed by a side surface of the third tab 3 facing the first tab 1 concavely toward the second tab 2 and/or by the third tab
  • the side surface of the sheet 3 facing the second tab sheet 2 is formed concavely toward the first tab sheet 1 .
  • the effective heat dissipation of the entire tab 100 can also be achieved, and it is beneficial to achieve the sealing of the cooling cavity 11 and avoid the leakage of the cooling medium.
  • one side surface of the third tab piece 3 in the thickness direction is in contact with the one side surface of the first tab piece 1 facing the third tab piece 3 ; and/or The other side surface of the third tab piece 3 in the thickness direction is in contact with the one side surface of the second tab piece 2 facing the third tab piece 3 . That is to say, only one side surface of the third tab piece 3 in the thickness direction may be in contact with the first tab piece 1, or only the other side surface in the thickness direction of the third tab piece 3 may be in contact with the second tab piece 1.
  • the tabs 2 are in contact with each other, and it is also possible that both sides of the third tab 3 in the thickness direction are in contact with the first tab 1 and the second tab 2 respectively.
  • the cooling channel 4 can better define the cooling cavity 11 together with the first tab piece 1 and the second tab piece 2 , so as to realize the heat dissipation of the tab 100 while avoiding the generation of cooling medium leakage. Moreover, by contacting the third tab piece 3 with the first tab piece 1 and/or the second tab piece 2, the conduction of heat is facilitated, so that the The heat can be better transferred to the cooling medium, which dissipates the heat out of the cell.
  • the cooling channel 4 includes a first cooling channel 41 and a plurality of second cooling channels 42 .
  • “plurality” means two or more.
  • one end of the first cooling channel 41 penetrates the side surface of the third tab 3 .
  • a plurality of second cooling passages 42 are arranged at intervals along the length direction of the first cooling passages 41 , one end of each second cooling passage 42 (eg, the left end in FIG. 2 ) communicates with the first cooling passage 41 , and each second cooling passage 42 communicates with the first cooling passage 41 .
  • the other end (eg, the right end in FIG. 2 ) of the channel 42 extends in a direction away from the first cooling channel 41 in the width direction of the first cooling channel 41 .
  • seven second cooling channels 42 are shown in the example of FIG. 2 .
  • the cooling medium flows in from the side of the third tab piece 3 , it first flows into the first cooling channel 41 , and then flows along the first cooling channel 41 to the seven second cooling channels 42 , so that the cooling medium fills the cooling cavity 11 .
  • the heat of the cell can be transferred to the cooling medium, and the heat is exchanged through the cooling medium, and finally the heat is dissipated to the outside of the cell.
  • the heat absorbed by the cooling medium can be better dissipated to the outside of the battery cell, thereby The heat dissipation of the tab 100 and the battery cell can be better realized, and the battery core can have a stable sealing structure under a higher charge and discharge current, so that the performance of the battery core is more excellent.
  • the first cooling channel 41 includes a first channel segment 411 and a second channel segment 412 that are connected to each other.
  • the width of the first channel segment 411 is greater than the width of the second channel segment 412 .
  • One end of the second channel segment 412 away from the first channel segment 411 penetrates through the side surface of the third tab 3 , and the above-mentioned ends of the plurality of first cooling channels 41 communicate with the first channel segment 411 .
  • the cooling medium can be filled from the second channel section 412 , and the cooling medium can pass along the second channel section. 412 flows to the first channel section 411 and then flows from the first channel section 411 to the plurality of second cooling channels 42 . After the cooling medium is filled, the second channel section 412 can be extruded and sealed by mechanical pressure, and finally sealed by laser welding or resistance welding to prevent the cooling medium from flowing out of the second channel section 412 .
  • the filling of the cooling medium is facilitated, and since the width of the second channel section 412 is smaller than the width of the first channel section 411, the second channel section 412 is convenient
  • the sealing can avoid the leakage of cooling medium due to the excessively large width of the second channel section 412, and the reliability is high.
  • the plurality of second cooling channels 42 are parallel to each other and are all perpendicular to the first cooling channel 41 , and the plurality of second cooling channels 42 are located at the same side of the first cooling channel 41 . side. In this way, the cooling medium flowing in from the first cooling channel 41 can flow evenly to the plurality of second cooling channels 42, the structure is simple, the processing is convenient, and the heat dissipation efficiency of the entire cooling cavity 11 can be improved, thereby effectively discharging the heat in the battery cells .
  • the first tab piece 1 , the second tab piece 2 and the third tab piece 3 can be connected by welding.
  • the third tab 3 and the first tab 1 and the third tab 3 and the second tab 2 may be combined by diffusion welding or brazing. In this way, a firm connection between the third tab 3 and the first tab 1 and between the third tab 3 and the second tab 2 can be achieved, so that the cooling cavity 11 can be defined, and the Heat dissipation, and cooling medium leakage can be avoided.
  • the structure is simple and the cost is low.
  • the cooling medium may be acetone, water or ethanol, or the like. Therefore, since acetone, water or ethanol have a high heat transfer coefficient, the heat of the cell can be effectively absorbed and discharged to achieve a better heat dissipation effect.
  • the first tab piece 1 and the second tab piece 2 may both be metal sheets.
  • the whole tab 100 can have good electrical conductivity, so as to lead out the electricity in the cell and generate a loop; moreover, the metal sheet has good thermal conductivity.
  • the tab 2 is a metal sheet, which is beneficial to conduct the heat in the cell to the outside of the cell, so as to realize the heat dissipation of the tab 100 and the whole cell.
  • the first tab piece 1 and the second tab piece 2 may both be aluminum parts or copper parts.
  • the first tab 1 , the second tab 2 and the third tab 3 can be aluminum parts; when the tab 100 is a negative tab
  • the first tab 1 , the second tab 2 and the third tab 3 may all be copper pieces. Therefore, when the tab 100 is the positive tab, the aluminum parts have better conductivity, softer texture, and lower cost, and at the same time, the surfaces of the first tab 1 and the second tab 2 can form a layer of oxide protective film.
  • the potential of the positive electrode is high, and the dense oxide protective film prevents the current collector from oxidizing.
  • the tab 100 is a negative tab, the conductivity of the copper piece is better, and the heat dissipation is better.
  • the cell according to the embodiment of the second aspect of the present disclosure includes a cell body and a tab 100 .
  • the tab 100 is the tab 100 according to the embodiment of the first aspect of the present disclosure
  • the tab 100 is provided on the cell body, and a part of the cooling cavity 11 of the tab 100 is located in the cell body and another Part of it is outside the cell body.
  • the cell body refers to the structure of the cell other than the tabs 100, for example, it may be assembled from a positive electrode plate, a negative electrode plate and a separator plate.
  • the cooling medium in the cooling cavity 11 can absorb and discharge the heat generated by the battery cell body during operation to the outside of the battery core body, thereby achieving a better heat dissipation effect.
  • the battery cell has excellent performance and can ensure the stability of the sealing structure under higher charge and discharge current.
  • a battery module (not shown in the figure) according to the embodiment of the third aspect of the present disclosure includes the battery cell according to the embodiment of the second aspect of the present disclosure.
  • a battery module may include a connecting piece and a plurality of cells.
  • the connecting piece can realize the connection between multiple cells.
  • Each cell may be provided with a pole core, wherein one end of the tab 100 is connected to the pole core, eg, welded, and the other end of the tab 100 is connected to the connection piece, eg, welded.
  • a cooling structure may be provided on the battery module. A portion of the tab 100 located outside the cell body corresponding to the cooling cavity 11 may be in contact with the cooling structure. In this way, when the tab 100 passes a large current, the heat inside the cell can be absorbed and conducted to the outside of the cell through the cooling medium, and then discharged through the cooling structure, thereby effectively avoiding the temperature rise of the tab 100 and improving the overall battery performance. module performance.
  • the battery module of the embodiment of the present disclosure by using the above-mentioned battery cells, when the tabs 100 pass a large current, the temperature rise can be avoided, and the heat dissipation effect is high, so that the entire battery module has excellent performance.
  • a battery pack (not shown) according to an embodiment of the fourth aspect of the present disclosure includes the battery cell according to the embodiment of the second aspect of the present disclosure.
  • the temperature of the battery pack can be effectively reduced, and the temperature of the battery pack can be prevented from being too high, so that the battery pack can ensure the stability of the sealing structure under large charge and discharge currents , to ensure that the battery pack has excellent performance.
  • first feature may include one or more of such features.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种极耳(100)和具有其的电芯、电池模组和电池包，所述极耳(100)包括：第一极耳片(1)；第二极耳片(2)，所述第二极耳片(2)设在所述第一极耳片(1)的厚度方向上的一侧，所述第二极耳片(2)与所述第一极耳片(1)之间内限定出至少一个冷却腔(11)，所述冷却腔(11)内填充有冷却介质。

Description

极耳和具有其的电芯、电池模组和电池包
相关申请的交叉引用
本公开要求比亚迪股份有限公司于2020年06月30日提交的、申请名称为“极耳和具有其的电芯、电池模组和电池包”的、中国专利申请号“202010617233.1”的优先权。
技术领域
本公开涉及电池技术领域，尤其是涉及一种极耳和具有其的电芯、电池模组和电池包。
背景技术
相关技术中，动力电池包的工作电流大，产热量大，同时由于动力电池包处于一个相对封闭的环境，就会导致极耳的温升比较大。然而，当极耳的温度长期较高时，会影响电芯的性能，缩短电芯的使用寿命。
发明内容
本公开旨在至少解决现有技术中存在的技术问题之一。为此，本公开的一个目的在于提出一种极耳，可以有效降低极耳和电芯的温度，从而使电芯的性能更加优异，延长电芯的使用寿命。
本公开的另一个目的在于提出一种具有上述极耳的电芯。
本公开的再一个目的在于提出一种具有上述电芯的电池模组。
本公开的又一个目的在于提出一种具有上述电芯的电池包。
根据本公开第一方面实施例的极耳，包括：第一极耳片；第二极耳片，所述第二极耳片设在所述第一极耳片的厚度方向上的一侧，所述第二极耳片与所述第一极耳片之间内限定出至少一个冷却腔，所述冷却腔内填充有冷却介质。
根据本公开实施例的极耳，通过设置第一极耳片和第二极耳片，并使第二极耳片与第一极耳片之间内限定出至少一个冷却腔且冷却腔内填充有冷却介质，具有较好的散热效果，可以有效降低极耳和电芯的温度，从而使电芯的性能更加优异，延长电芯的使用寿命。
根据本公开的一些实施例，所述极耳还包括：第三极耳片，所述第三极耳片设在所述第一极耳片和所述第二极耳片之间，所述第三极耳片上形成有至少一个冷却通道，所述冷却通道与所述第一极耳片和/或所述第二极耳片之间共同限定出所述冷却腔。
根据本公开的一些实施例，所述冷却通道沿所述第三极耳片的厚度方向贯穿所述第三极耳片，所述冷却通道与所述第一极耳片和所述第二极耳片共同限定出所述冷却腔。
根据本公开的一些实施例，所述第三极耳片的厚度方向上的一侧表面与所述第一极耳片的面向所述第三极耳片的一侧表面接触；和/或所述第三极耳片的厚度方向上的另一侧表面与所述第二极耳片的面向所述第三极耳片的一侧表面接触。
根据本公开的一些实施例，所述冷却通道包括：第一冷却通道，所述第一冷却通道的一端贯穿所述第三极耳片的侧面；多个第二冷却通道，多个所述第二冷却通道沿所述第一冷却通道的长度方向间隔设置，每个所述第二冷却通道的一端与所述第一冷却通道连通，每个所述第二冷却通道的另一端沿所述第一冷却通道的宽度方向朝向远离所述第一冷却通道的方向延伸。
根据本公开的一些实施例，所述第一冷却通道包括彼此相连的第一通道段和第二通道段，所述第一通道段的宽度大于所述第二通道段的宽度，所述第二通道段的远离所述第一通道段的一端贯穿所述第三极耳片的侧面，多个所述第一冷却通道的所述一端与所述第一通道段连通。
根据本公开的一些实施例，多个所述第二冷却通道相互平行且均与所述第一冷却通道垂直，且多个所述第二冷却通道位于所述第一冷却通道的同一侧。
根据本公开第二方面实施例的电芯，包括电芯本体；极耳，所述极耳为根据本公开上述第一方面实施例的极耳，所述极耳设在所述电芯本体上，所述极耳的所述冷却腔的一部分位于所述电芯本体内且另一部分位于所述电芯本体外。
根据本公开第三方面实施例的电池模组，包括根据本公开上述第二方面实施例的电芯。
根据本公开第四方面实施例的电池包，包括根据本公开上述第二方面实施例的电芯。
本公开的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本公开的实践了解到。
附图说明
本公开的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1是根据本公开实施例的极耳的立体图；
图2是图1中所示的极耳的爆炸图；
图3是图1中所示的极耳的俯视图；
图4是沿图3中A-A线的剖面图；
图5是图4中圈示的B部的放大图。
附图标记：
100：极耳；
1：第一极耳片；11：冷却腔；2：第二极耳片；
3：第三极耳片；4：冷却通道；41：第一冷却通道；
411：第一通道段；412：第二通道段；
42：第二冷却通道；5：极耳胶。
具体实施方式
下面详细描述本公开的实施例，参考附图描述的实施例是示例性的，下面详细描述本公开的实施例。
下面参考图1-图5描述根据本公开第一方面实施例的极耳100。极耳100可以应用于电芯(图未示出)。在本申请下面的描述中，以极耳100应用于电芯为例进行说明。
如图1和图2所示，根据本公开第一方面实施例的极耳100，包括第一极耳片1和第二极耳片2。第二极耳片2设在第一极耳片1的厚度方向上的一侧，第二极耳片2与第一极耳片1之间限定出至少一个冷却腔11，冷却腔11内填充有冷却介质。
由此，当电芯工作时，电芯产生的热量可以通过第一极耳片1、第二极耳片2的位于电芯内的部分传递至冷却腔11，冷却腔11内的冷却介质能够吸收热量并将热量传递至第一极耳片1、第二极耳片2的位于电芯外的部分，从而可以将电芯产生的热量散发至电芯外，有效降低极耳100的温度，实现较好的散热效果，使电芯在更高的充放电电流下能够具有优异的性能，延长电芯的使用寿命。
根据本公开实施例的极耳100，通过设置第一极耳片1和第二极耳片2，并使第二极耳片2与第一极耳片1之间内限定出至少一个冷却腔11且冷却腔11内填充有冷却介质，具有较好的散热效果，可以有效降低极耳100和电芯的温度，从而使电芯的性能更加优异，延长电芯的使用寿命。
在一个实施例中，参照图1，极耳100可以包括极耳胶5，极耳胶5设在第一极耳片1和第二极耳片2的彼此背离的表面上，以实现与极耳100与铝塑膜的密封。由此，冷却腔11内的冷却介质在降低极耳100的温度的同时，可以延长极耳胶5的密封寿命，使电芯在更高的充放电电流下能够保证密封结构的稳定性。
在本公开的一些实施例中，参照图2，极耳100还包括：第三极耳片3，第三极耳片3设在第一极耳片1和第二极耳片2之间，第三极耳片3上形成有至少一个冷却通道4，冷却通道4与第一极耳片1和/或第二极耳片2之间共同限定出冷却腔11。
例如，当冷却腔11为一个时，冷却腔11可以由冷却通道4与第一极耳片1共同限定出；或者，冷却腔11也可以由冷却通道4与第二极耳片2共同限定出；当然，冷却腔11可以由冷却通道4与第一极耳片1和第二极耳片2共同限定出。当冷却腔11为多个时，多 个冷却腔11可以均由冷却通道4与第一极耳片1共同限定出；或者，多个冷却腔11可以均由冷却通道4与第二极耳片2共同限定出；又或者，多个冷却腔11可以均由冷却通道4与第一极耳片1和第二极耳片2共同限定出；再或者，多个冷却腔11中的一部分由冷却通道4与第一极耳片1共同限定出，多个冷却腔11中的另一部分由冷却通道4与第二极耳片2共同限定出；当然，还可以是多个冷却腔11中的一部分由冷却通道4与第一极耳片1或第二极耳片2共同限定出，多个冷却腔11中的另一部分由冷却通道4与第一极耳片1和第二极耳片2共同限定出。
由此，通过设置上述的第三极耳片3，在保证可以形成冷却腔11、从而有效降低极耳100的温度并提升电芯的性能的同时，可以在第三极耳片3上加工冷却通道4，使第一极耳片1和第二极耳片2的结构可以较简单，方便第一极耳片1和第二极耳片2的加工。
在本公开的一些可选实施例中，结合图2和图5，冷却通道4沿第三极耳片3的厚度方向贯穿第三极耳片3，冷却通道4与第一极耳片1和第二极耳片2共同限定出冷却腔11。由此，由于第三极耳片3的厚度通常较薄，如此设置，在实现整个极耳100的有效散热的同时，可以方便冷却通道4的加工，提高加工效率，缩短工时。
当然，本公开不限于此，冷却通道4也可以由第三极耳片3的面向第一极耳片1的一侧表面朝向第二极耳片2凹入形成和/或由第三极耳片3的面向第二极耳片2的一侧表面朝向第一极耳片1凹入形成。如此设置，同样可以实现整个极耳100的有效散热，且有利于实现冷却腔11的密封，避免冷却介质产生泄漏。
在一个实施例中，如图5所示，第三极耳片3的厚度方向上的一侧表面与第一极耳片1的面向第三极耳片3的一侧表面接触；和/或第三极耳片3的厚度方向上的另一侧表面与第二极耳片2的面向第三极耳片3的一侧表面接触。也就是说，可以仅第三极耳片3的厚度方向上的一侧表面与第一极耳片1接触，也可以仅第三极耳片3的厚度方向上的另一侧表面与第二极耳片2接触，还可以是第三极耳片3的厚度方向的两侧表面分别与第一极耳片1和第二极耳片2接触。由此，通过上述设置，冷却通道4可以更好地与第一极耳片1和第二极耳片2共同限定出冷却腔11，从而在实现极耳100的散热的同时，避免冷却介质产生泄漏。而且，通过使第三极耳片3与第一极耳片1和/或第二极耳片2接触，有利于热量的传导，使第一极耳片1和第二极耳片2上的热量可以更好地传递至冷却介质，从而将热量排到电芯外。
在本公开的一些具体实施例中，参照图2，冷却通道4包括第一冷却通道41和多个第二冷却通道42。在本公开的描述中，“多个”的含义是两个或两个以上。
在一个实施例中，第一冷却通道41的一端贯穿第三极耳片3的侧面。多个第二冷却通道42沿第一冷却通道41的长度方向间隔设置，每个第二冷却通道42的一端(例如，图2 中的左端)与第一冷却通道41连通，每个第二冷却通道42的另一端(例如，图2中的右端)沿第一冷却通道41的宽度方向朝向远离第一冷却通道41的方向延伸。
例如，在图2的示例中示出了七个第二冷却通道42。当冷却介质从第三极耳片3的侧面流入后，首先流入第一冷却通道41，然后沿第一冷却通道41流动并流向七个第二冷却通道42，使冷却介质充满冷却腔11。当电芯工作时，电芯的热量可以传递至冷却介质，并通过冷却介质进行换热，最终将热量散发至电芯外。
图2中显示了七个第二冷却通道42用于示例说明的目的，但是普通技术人员在阅读了本申请的技术方案之后、显然可以理解将该方案应用到其它数量的第二冷却通道42的技术方案中，这也落入本公开的保护范围之内。
由此，通过设置上述的第一冷却通道41和间隔设置的多个第二冷却通道42，与整体式的冷却通道4相比，冷却介质吸收的热量可以更好地散发到电芯外，从而可以更好地实现极耳100和电芯的散热，保证电芯在较高的充放电电流下能够具有稳定的密封结构，使电芯的性能更加优异。
在一个实施例中，如图2所示，第一冷却通道41包括彼此相连的第一通道段411和第二通道段412，第一通道段411的宽度大于第二通道段412的宽度，第二通道段412的远离第一通道段411的一端贯穿第三极耳片3的侧面，多个第一冷却通道41的上述一端与第一通道段411连通。
例如，结合图2，当第一极耳片1、第二极耳片2和第三极耳片3连接完成后，可以从第二通道段412填充冷却介质，冷却介质可以沿第二通道段412流动至第一通道段411，然后从第一通道段411流向多个第二冷却通道42。当冷却介质填充完毕后，可以通过机械压力将第二通道段412挤压封合，最后再通过激光焊接或电阻焊等方式实现最终密封，以防止冷却介质从第二通道段412流出。由此，通过设置上述的第一通道段411和第二通道段412，方便冷却介质的填充，而且，由于第二通道段412的宽度小于第一通道段411的宽度，方便第二通道段412的密封，可以避免由于第二通道段412的宽度过大而导致冷却介质泄漏，可靠性较高。
在本公开的一些可选实施例中，参照图2，多个第二冷却通道42相互平行且均与第一冷却通道41垂直，且多个第二冷却通道42位于第一冷却通道41的同一侧。如此设置，从第一冷却通道41流入的冷却介质可以均匀流向多个第二冷却通道42，结构简单，方便加工，且可以提高整个冷却腔11的散热效率，从而有效将电芯内的热量排出。
在一个实施例中，第一极耳片1、第二极耳片2和第三极耳片3可以焊接连接。例如，第三极耳片3与第一极耳片1之间以及第三极耳片3与第二极耳片2可以通过扩散焊或钎焊等工艺实现复合焊接。如此，可以实现第三极耳片3和第一极耳片1以及第三极耳片3 和第二极耳片2之间的牢靠连接，从而可以限定出冷却腔11，实现极耳100的散热，且可以避免冷却介质泄漏。另外，如此设置，结构简单，成本较低。
在一个实施例中，冷却介质可以为丙酮、水或乙醇等。由此，由于丙酮、水或乙醇具有较高的传热系数，从而可以有效吸收电芯的热量并排出，实现较好的散热效果。
在一个实施例中，第一极耳片1和第二极耳片2可以均为金属片。如此设置，可以使整个极耳100具有较好的导电性能，以将电芯内的电引出并产生回路；而且，金属片具有良好的导热性能，通过使第一极耳片1、第二极耳片2为金属片，有利于将电芯内的热量传导至电芯外，从而实现极耳100以及整个电芯的散热。
在一个实施例中，第一极耳片1和第二极耳片2可以均为铝件或铜件。在一个实施例中，例如，当极耳100为正极极耳时，第一极耳片1、第二极耳片2和第三极耳片3可以均为铝件；当极耳100为负极极耳时，第一极耳片1、第二极耳片2和第三极耳片3可以均为铜件。由此，当极耳100为正极极耳时，铝件的导电性较好，且质地比较软，成本较低，同时第一极耳片1和第二极耳片2的表面可以形成一层氧化物保护膜。而且，正极的电位高，致密的氧化物保护膜可防止集流体氧化。当极耳100为负极极耳时，铜件的导电率较好，且散热较好。
根据本公开第二方面实施例的电芯，包括电芯本体和极耳100。在一个实施例中，极耳100为根据本公开上述第一方面实施例的极耳100，极耳100设在电芯本体上，极耳100的冷却腔11的一部分位于电芯本体内且另一部分位于电芯本体外。其中，电芯本体指的是电芯的除极耳100以外的结构，例如可以由正极板、负极板和隔膜板组装而成。
根据本公开实施例的电芯，通过采用上述的极耳100，冷却腔11内的冷却介质能够将电芯本体工作时产生的热量吸收并排到电芯本体外，可以实现较好的散热效果，使电芯具有优异的性能，在更高的充放电电流下能够保证密封结构的稳定性。
根据本公开第三方面实施例的电池模组(图未示出)，包括根据本公开上述第二方面实施例的电芯。
例如，电池模组可以包括连接片和多个电芯。连接片可以实现多个电芯之间的连接。每个电芯内可以设有极芯，其中，极耳100的一端与极芯连接例如焊接，极耳100的另一端与连接片连接例如焊接。电池模组上可以设有冷却结构。极耳100的位于电芯本体外的部分中与冷却腔11对应的部分可以与冷却结构接触。这样，当极耳100通过大电流时，可以通过冷却介质将电芯内部的热量吸收并传导至电芯外部，然后再通过冷却结构排出，从而有效避免极耳100的温度升高，提高整个电池模组的性能。
根据本公开实施例的电池模组，通过采用上述的电芯，当极耳100通过大电流可以避免温升过高，具有较高的散热效果，从而使整个电池模组具有优异的性能。
根据本公开第四方面实施例的电池包(图未示出)，包括根据本公开上述第二方面实施例的电芯。
根据本公开实施例的电池包，通过采用上述的电芯，可以有效降低电池包的温度，避免电池包的温度过高，从而使电池包在较大充放电电流下能够保证密封结构的稳定性，保证电池包具有优异的性能。
根据本公开实施例的电池包的其他构成以及操作对于本领域普通技术人员而言都是已知的，这里不再详细描述。
在本公开的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本公开和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本公开的限制。
在本公开的描述中，“第一特征”、“第二特征”可以包括一个或者更多个该特征。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示意性实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本公开的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施例或示例。
尽管已经示出和描述了本公开的实施例，本领域的普通技术人员可以理解：在不脱离本公开的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型，本公开的范围由权利要求及其等同物限定。

Claims (10)

  1. 一种极耳，其特征在于，包括：
    第一极耳片；
    第二极耳片，所述第二极耳片设在所述第一极耳片的厚度方向上的一侧，所述第二极耳片与所述第一极耳片之间限定出至少一个冷却腔，所述冷却腔内填充有冷却介质。
  2. 根据权利要求1所述的极耳，其特征在于，所述极耳还包括：
    第三极耳片，所述第三极耳片设在所述第一极耳片和所述第二极耳片之间，所述第三极耳片上形成有至少一个冷却通道，所述冷却通道与所述第一极耳片和/或所述第二极耳片之间共同限定出所述冷却腔。
  3. 根据权利要求2所述的极耳，其特征在于，所述冷却通道沿所述第三极耳片的厚度方向贯穿所述第三极耳片，所述冷却通道与所述第一极耳片和所述第二极耳片共同限定出所述冷却腔。
  4. 根据权利要求2或3所述的极耳，其特征在于，所述第三极耳片的厚度方向上的一侧表面与所述第一极耳片的面向所述第三极耳片的一侧表面接触；和/或
    所述第三极耳片的厚度方向上的另一侧表面与所述第二极耳片的面向所述第三极耳片的一侧表面接触。
  5. 根据权利要求2-4中任一项所述的极耳，其特征在于，所述冷却通道包括：
    第一冷却通道，所述第一冷却通道的一端贯穿所述第三极耳片的侧面；
    多个第二冷却通道，多个所述第二冷却通道沿所述第一冷却通道的长度方向间隔设置，每个所述第二冷却通道的一端与所述第一冷却通道连通，每个所述第二冷却通道的另一端沿所述第一冷却通道的宽度方向朝向远离所述第一冷却通道的方向延伸。
  6. 根据权利要求5所述的极耳，其特征在于，所述第一冷却通道包括彼此相连的第一通道段和第二通道段，所述第一通道段的宽度大于所述第二通道段的宽度，所述第二通道段的远离所述第一通道段的一端贯穿所述第三极耳片的侧面，多个所述第一冷却通道的所述一端与所述第一通道段连通。
  7. 根据权利要求5或6所述的极耳，其特征在于，多个所述第二冷却通道相互平行且均与所述第一冷却通道垂直，且多个所述第二冷却通道位于所述第一冷却通道的同一侧。
  8. 一种电芯，其特征在于，包括：
    电芯本体；
    极耳，所述极耳为根据权利要求1-7中任一项所述的极耳，所述极耳设在所述电芯本体上，所述极耳的所述冷却腔的一部分位于所述电芯本体内且另一部分位于所述电芯本体外。
  9. 一种电池模组，其特征在于，包括根据权利要求8所述的电芯。
  10. 一种电池包，其特征在于，包括根据权利要求8所述的电芯。
PCT/CN2021/093194 2020-06-30 2021-05-12 极耳和具有其的电芯、电池模组和电池包 WO2022001382A1 (zh)

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