WO2021159994A1 - Batterie, module de batterie, bloc-batterie et véhicule électrique - Google Patents

Batterie, module de batterie, bloc-batterie et véhicule électrique Download PDF

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Publication number
WO2021159994A1
WO2021159994A1 PCT/CN2021/074817 CN2021074817W WO2021159994A1 WO 2021159994 A1 WO2021159994 A1 WO 2021159994A1 CN 2021074817 W CN2021074817 W CN 2021074817W WO 2021159994 A1 WO2021159994 A1 WO 2021159994A1
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WO
WIPO (PCT)
Prior art keywords
battery
pole core
electrode
sampling
assembly
Prior art date
Application number
PCT/CN2021/074817
Other languages
English (en)
Chinese (zh)
Inventor
郭永明
张中林
何平
刘彦初
周贵树
Original Assignee
比亚迪股份有限公司
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Application filed by 比亚迪股份有限公司 filed Critical 比亚迪股份有限公司
Publication of WO2021159994A1 publication Critical patent/WO2021159994A1/fr

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular 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
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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 invention relates to the technical field of batteries, in particular to a battery, a battery module, a battery pack and an electric vehicle.
  • the present invention aims to solve one of the technical problems in the related art at least to a certain extent.
  • a battery including:
  • a housing including a cover plate located at an end of the battery
  • a pole core set the pole core set is located in the housing, and the pole core set includes at least one pole core;
  • a battery information collector where the battery information collector is used to collect information of the pole core group
  • the sampling component is fixed on the cover plate, and is electrically connected with the pole core group and the battery information collector, and is used for collecting information of the pole core group and transmitting the information to the station The battery information collector;
  • a pressing plate assembly which is used to fix the battery information collector on the sampling assembly and electrically connect the battery information collector with the sampling assembly.
  • the plurality of pole core groups are arranged along a first direction and connected in series, and the first direction is the length direction of the battery.
  • the pressure plate assembly includes a locking connector and a pressure plate, and the locking connector is arranged on a surface of the sampling assembly facing away from the cover plate and electrically connected to the sampling assembly, The pressure plate is arranged on the side of the locking connector away from the sampling assembly;
  • the battery information collector is sandwiched between the locking connector and the pressure plate, and the battery information collector is electrically connected to the locking connector.
  • the locking connector is provided with a first through hole
  • the pressure plate is provided with a second through hole corresponding to the first through hole
  • the pressure plate assembly further includes The first fixing piece and the second fixing piece are matched, the second fixing piece is fixed on the sampling assembly; the first fixing piece passes through the first through hole and the second through hole and It is fixed with the second fixing member to clamp the battery information collector between the locking connector and the pressing plate.
  • the first fixing member is a bolt
  • the second fixing member is a nut adapted to the bolt
  • the locking connector is provided with a plurality of connection through holes penetrating the locking connector, and the connection through holes are provided with an elastic sheet structure, and the elastic sheet structure is electrically connected to the The sampling component and the battery information collector.
  • the sampling assembly includes a ceramic piece, a connecting piece, and a sampling needle.
  • the ceramic piece is fixed on the cover plate through the connecting piece, and the sampling needle is fixed on the ceramic piece.
  • the ceramic piece is provided with a through hole penetrating the ceramic piece, and the sampling needle is fixedly connected in the through hole.
  • the first end of the sampling needle passes through the ceramic piece and is inserted into the connection through hole in the locking connector to be electrically connected to the elastic sheet structure.
  • the connecting piece is fixedly connected to the ceramic piece, the second end of the sampling needle passes through the connecting piece, and the connecting piece is fixedly connected to the cover plate.
  • the cover plate is provided with a groove, a sampling through hole penetrating the cover plate is provided in the middle of the groove, and the connecting piece is fixedly connected in the groove, so The second end of the sampling needle passes through the sampling through hole.
  • a packaging film is further provided between the housing and the pole core group, and the pole core group is encapsulated in the packaging film.
  • the pole core set includes a pole core set body and a first electrode and a second electrode electrically connected to the pole core set body for drawing current, and the two pole core sets connected in series
  • the connection between the first electrode of one pole core group and the second electrode of the other pole core group is located in the packaging film.
  • an encapsulation portion is formed at a position relative to the encapsulation film and the first electrode and/or the second electrode to isolate the main bodies of adjacent two-electrode core groups;
  • At least one of the first electrode of one electrode core group and the second electrode of the other electrode core group in the adjacent two electrode core groups is located in the encapsulation part.
  • the packaging film includes a plurality of sub-package films arranged at intervals, and each sub-package film is packaged with a pole core group to form a pole core assembly, and the pole core assemblies are connected in series.
  • the battery further includes a battery controller, which is connected to the battery information collector, and is configured to receive the information of the electrode assembly collected by the battery information collection, and The battery is controlled according to the information of the pole core group.
  • a battery module including a plurality of batteries as described in any one of the above.
  • a battery pack which includes a plurality of batteries as described in any one of the above or includes a plurality of battery modules as described above.
  • an electric vehicle which includes the above-mentioned battery module or the above-mentioned battery pack.
  • the battery of the present invention improves the conductive connectivity between the sampling assembly and the battery information collector through the pressing plate assembly on the cover plate, and collects the information of the electrode core assembly through the sampling assembly, so as to better carry out the power battery
  • the management and control of the battery improve the safety of battery use.
  • FIG. 1 is a schematic structural diagram of a battery provided by an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a structure of a cover plate part of a battery provided by an embodiment of the present invention.
  • Fig. 3 is a three-dimensional exploded view of Fig. 2.
  • Fig. 4 is a three-dimensional exploded view of the cover plate and the sampling assembly in Fig. 2.
  • Fig. 5 is a front view of a cover part of a battery provided by an embodiment of the present invention.
  • Fig. 6 is a cross-sectional view taken along line B-B in Fig. 5.
  • Fig. 7 is a cross-sectional view taken along line C-C in Fig. 5.
  • FIG. 8 is a cross-sectional view of a battery provided by an embodiment of the application.
  • FIG. 9 is a cross-sectional view of a battery provided by another embodiment of the application.
  • an embodiment of the present invention provides a battery 10, which includes a casing 100, a pole core assembly 500, a battery information collector 200, a sampling assembly 300 and a pressure plate assembly 400.
  • the housing 100 includes a cover plate 110 located at the end of the battery 10.
  • the cover plate 110 may be one or two.
  • the sampling assembly 300 may be located on one cover plate 110, or both cover plates may have the sampling assembly 300.
  • the housing 100 includes a side housing with open ends and two cover plates 110 located at the two ends respectively.
  • the two cover plates 110 and the side housing enclose a closed accommodating cavity, and the accommodating cavity is provided with
  • the pole core assembly 500 (as shown in FIG. 8 )
  • the sampling assembly 300 is located on one of the cover plates 110.
  • the pole core set 500 is located in the housing 100, and the pole core set 500 includes at least one pole core.
  • the battery information collector 200 is used to collect information of the pole core group 500 in the battery.
  • the information of the pole core assembly 500 includes current, voltage, temperature information, etc., and the battery information collector 200 can also be used to collect air pressure information in the accommodating cavity.
  • the battery information collector 200 includes a flexible circuit board in which an information transmission line is integrated.
  • the battery 10 further includes a battery controller (not shown in the figure). The battery controller is connected to the battery information collector 200 for receiving the information of the electrode assembly collected by the battery information collector 200, and according to The information of the pole core group 500 controls the battery 10.
  • the battery controller is a battery BMS unit, which may contain a PCBA hard board.
  • the battery information collector 200 includes a battery controller, that is to say, the battery information collector 200 can be used to collect the information of the electrode core group, and can also control and process the battery according to the information, for example, Arrange some voltage, temperature, chip and other components on the flexible circuit board at the same time.
  • the sampling assembly 300 is fixed on the cover 110 (as shown in FIG. 2), and is electrically connected to the electrode core group 500 in the battery and the battery information collector 200, and is used to collect the information of the electrode core group 500 in the battery and store the information. Transfer to the battery information collector 200.
  • the battery information collector 200 transmits the collected information of the electrode assembly 500 to the battery controller, and the battery controller controls and manages the battery according to the information, so as to protect the battery 10 and avoid battery damage.
  • the cover plate 110 also has a negative terminal 120.
  • the sampling assembly 300 may also be installed on a cover plate with a positive terminal.
  • the pressing plate assembly 400 is used to fix the battery information collector 200 on the sampling assembly 300 and electrically connect the battery information collector 200 and the sampling assembly 300.
  • the battery information collector 200 and the sampling assembly 300 are compacted and fixed by the pressure plate assembly 400 to improve the electrical connection between the battery information collector 200 and the sampling assembly 300, so that the battery information collector 200 can accurately obtain the battery pole core Group 500 information to better manage and control the power battery and improve the safety of battery use.
  • the pressure plate assembly 400 is used to improve the conductive connectivity between the sampling assembly 300 and the battery information collector 200, and the sampling assembly 300 collects the information of the electrode core assembly 500 to better manage and control the power battery. Improve the safety of battery use.
  • the pressing plate assembly 400 includes a locking connector 410 and a pressing plate 420.
  • the locking connector 410 is disposed on the surface of the sampling assembly 300 facing away from the cover 110 and is connected to the sampling assembly 300.
  • the pressure plate 420 is arranged on the side of the locking connector 410 away from the sampling assembly 300; the battery information collector 420 is sandwiched between the locking connector 410 and the pressure plate 420, and the battery information collector 200 is connected to the locking connector 410 electrical connection.
  • one side of the locking connector 410 is electrically connected to the sampling assembly 300, and the other side of the locking connector 410 is electrically connected to the battery information collector 200, so that the information collected by the sampling assembly 300 of the electrode assembly 500 is transmitted
  • the side of the battery information collector 200 away from the locking connector 410 is compacted by the pressing plate 420 to improve the conductivity between the sampling assembly 300, the locking connector 410 and the battery information collector 200 Connectivity.
  • the material of the locking connector 410 is PPS or polyester insulating material, and metal layers are plated on both surfaces of the locking connector 410, preferably gold plated.
  • the locking connector 410 is provided with a first through hole 411
  • the pressing plate 420 is provided with a second through hole 421 corresponding to the first through hole 411.
  • the number of the first through hole 411 and the second through hole 421 is two, and they are symmetrically arranged at both ends of the locking connector 410 and the pressing plate 420, respectively.
  • the pressing plate assembly 400 further includes a first fixing member 430 and a second fixing member 440 that are adapted to each other.
  • the second fixing member 440 is fixed on the sampling assembly 300; the first fixing member 430 passes through the first through hole 411 and the second through hole. 421 is fixed with the second fixing member 440 to clamp the battery information collector 200 between the locking connector 410 and the pressing plate 120.
  • the first fixing member 430 is a bolt
  • the second fixing member 440 is a nut adapted to the bolt.
  • the first fixing member 430 is spirally moved along the axial direction of the first through hole 411 and the second through hole 421 and screwed into the second fixing member 440 to fasten the locking connector 410 and the pressing plate 120.
  • the number of the first fixing member 430 and the number of the second fixing member 440 corresponds to the first through hole 411 and the second through hole 421, which is two in this embodiment.
  • the locking connector 410 is provided with a plurality of connecting through holes 412 penetrating the locking connector 410, the connecting through holes 412 are provided with an elastic sheet structure 450, and the elastic sheet structure 450 is electrically connected to the sampling assembly 300 and the battery Information collector 200.
  • the material of the shrapnel structure 450 is T2.
  • the sampling assembly 300 includes a ceramic piece 310, a connecting piece 320, and a sampling needle 330.
  • the ceramic piece 310 is fixed on the cover 110 through the connecting piece 320, and the sampling needle 330 is fixed on the ceramic piece 310.
  • the sampling needle 330 is electrically connected to the elastic sheet structure 450 and the sampling needle 330 is electrically connected to the battery information collector 200.
  • the second fixing part 440 is brazed in the ceramic part 310 (as shown in FIG. 7) to improve the welding reliability of the second fixing part 440 and the ceramic part 410, so that the first fixing part 410 and the second fixing part 440 are screwed together.
  • the locking connector 410 and the battery information collector 200 can be tightly pressed to realize the transmission of information.
  • the ceramic piece 310 is provided with a through hole 311 penetrating the ceramic piece 310, and the sampling needle 330 is fixedly connected in the through hole 311.
  • the sampling needle 330 is welded in the through hole 311, specifically brazing.
  • the number of through holes 311 corresponds to the number of sampling needles 330.
  • the through holes 311 are arranged at intervals, so that the sampling needles 330 are arranged at intervals to ensure the insulation between the sampling needles 330.
  • the first end 331 of the sampling needle 330 passes through the ceramic member 310 and is inserted into the connection through hole 412 in the locking connector 410 to be electrically connected to the elastic sheet structure 450 (as shown in FIGS. 3 and 4). ).
  • the sampling needle 330 is installed in the through hole 311, on the one hand, there is a tolerance in the length of the sampling needle 330, and there is a height difference in the height of the sampling needle 330 protruding from the through hole 311, on the other hand, when the need for brazing is required After high temperature baking at 600°C, the sampling needle 330 is deformed.
  • the elastic sheet structure 450 is installed in the connection through hole 412 to eliminate the height difference caused by the above factors, so as to improve the connection orderliness and sealing performance between the ceramic member 310 and the locking connector 410.
  • the sampling needle 330 is preferably a copper needle made of oxygen-free copper or T2 copper.
  • the connecting piece 320 is an aluminum connecting piece.
  • the surface of the sampling needle 330 in contact with the ceramic member 310 is provided with a metal layer to improve the conductive connectivity between the two and reduce the contact resistance.
  • the metal layer is a gold layer.
  • the thickness of the metal layer is preferably 0.2 mm.
  • a connecting terminal (not shown in the figure) is provided on the surface of the battery information collector 200 facing the locking connector 410, and the connecting terminal is connected to the surface of the battery information collector 200.
  • the elastic piece structure 450 abuts against the connecting terminal, and the sampling needle 330 is electrically connected to the battery information collector 200 through the elastic piece structure 450.
  • the locking connector 410 does not have the elastic sheet structure 450, the first end 331 of the sampling needle 330 passes through the connection through hole 412 to directly abut the connection terminal, and is electrically connected to the battery information collector 200.
  • the number of sampling needles 330 in this embodiment is seven, of which one sampling piece 330 serves as the negative collection terminal, and the other 6 sampling pieces 330 serve as the positive collection terminal of the 6 pole core groups 500, respectively.
  • the negative terminal of the collection and the positive terminal of one collection collect the information of the corresponding pole core group 500. Therefore, in this embodiment, six pole core groups 500 can be sampled at the same time. Of course, it is also possible to sample less than 6 pole core groups 500. In other embodiments, the number of sampling pieces 330 may be 11, and 10 or less pole core groups 500 may be sampled. The number can also be set according to specific needs.
  • the connecting piece 320 is fixedly connected to the ceramic piece 310, the second end 332 of the sampling needle 330 passes through the connecting piece 320, and the connecting piece 320 is fixedly connected to the cover plate 110 (as shown in FIGS. 6 and 7) .
  • the connecting piece 320 is a ring-shaped penetrating through the middle, and the connecting piece 320 and the ceramic part 310 are fixedly connected by brazing.
  • the sampling needle 330 is brazed on the ceramic piece 310, the ceramic piece 310 is brazed on the connecting piece 320, and the connecting piece 320 is welded on the cover 110, which is compared with directly welding the sampling needle 330 on the cover.
  • the air tightness is higher, the supporting strength is higher, and the connection is firmer, so as to ensure the structural drawing strength and tightness requirements of the sampling needle 330 and the ceramic part 310.
  • the cover plate 110 is provided with a groove 111 (as shown in FIG. 4), a sampling through hole 112 penetrating the cover plate 110 is provided in the middle of the groove 111, and the connecting piece 320 is fixedly connected in the groove 111 , The second end 320 of the sampling needle 330 passes through the sampling through hole 112.
  • the groove 111 is formed inwardly by the cover plate 110 from the surface facing the ceramic member 310 toward the pole core assembly 500.
  • the connecting piece 320 is fixedly connected in the recess 111 by welding.
  • the sampling assembly 300 further includes a sampling line (not shown in the figure), one end of the sampling line is connected to the sampling needle 330, and the other end of the sampling line is electrically connected to the electrode core assembly 500.
  • the sampling line can be connected to the pole core assembly 500 through the sampling hole in the side shell.
  • each pole core group 500 contains at least one pole core.
  • there are three pole core groups 500 (as shown in FIG. 8), and the three pole core groups 500 are arranged along the first direction A and connected in series. In other embodiments, the number of pole core groups 500 can be set according to actual needs.
  • a packaging film 600 is further provided between the housing 100 and the pole core set 500, and the pole core set 500 is encapsulated in the packaging film 600.
  • each pole core group 500 is a soft-coated pole core group 500, that is, the pole core group 500 is sealed with an outer packaging film 600.
  • the preferred sealing material of the packaging film 600 is PET and PP composite film or aluminum-plastic film.
  • the soft-clad electrode core assembly 500 will expand after being divided into a volume.
  • the housing 100 is generally encapsulated with an aluminum shell.
  • the cavity inside the packaging film 600 needs to be pumped under negative pressure to constrain the soft-clad electrode core assembly 500, so the packaging film
  • the accommodating cavity in 600 has air tightness requirements.
  • fixing the sampling needle 330 on the cover plate 110 through the ceramic member 310 and the connecting piece 320 can improve the airtightness of the connection between the cover plate 100 and the sampling needle 330.
  • the housing 100 is a metal housing
  • the pole core assembly 500 is first encapsulated in the packaging film 600
  • the metal shell 100 is sheathed on the packaging film 600, thereby realizing the two pole core assembly 500
  • the secondary packaging improves the sealing performance of the battery 10. It can be understood that electrolyte solution is also injected into the packaging film 600. Therefore, through the above method, the contact of the electrolyte with the metal casing 100 can also be avoided, and the corrosion of the metal casing 100 or the decomposition of the electrolyte can be avoided.
  • the pole core set 500 includes a pole core set main body 510, and a first electrode 520 and a second electrode 530 electrically connected to the pole core set main body 510 for drawing current.
  • the two pole core sets 500 connected in series
  • the junction between the first electrode 520 of one of the pole core groups 500 and the second electrode 530 of the other pole core group 500 is located in the packaging film 600.
  • the packaging film 600 is integrally arranged, and multiple pole core groups 500 are encapsulated in the same packaging film 600.
  • multiple pole cores in the same pole core set 500 are connected in parallel, and the pole core sets 500 are connected in parallel. Connected in series, which can increase the capacity of the battery and reduce the manufacturing cost.
  • each of the pole core groups 500 includes a first electrode 520 and a second electrode 530 for drawing current. If the pole core group 500 contains only one pole core The first electrode 520 and the second electrode 530 may be the positive electrode ear and the negative electrode ear of the pole core respectively or the negative electrode ear or the positive electrode ear respectively. If multiple pole cores are included, the first electrode 520 and the second electrode lead-out part 530 may be electrode leads.
  • the "first" and "second" in the first electrode 520 and the second electrode 530 are only used for name distinction, and not for limiting the number.
  • the first electrode 520 may contain one or more.
  • the negative pressure in the metal casing 100 can effectively prevent the movement of the plurality of electrode core groups 500 in the metal casing 100 and improve the safety performance of the battery 100.
  • the encapsulation part 540 is formed at the position of the encapsulation film 600 opposite to the first electrode 520 and/or the second electrode 530 to isolate the main body 510 of the adjacent two-pole core group; At least one of the first electrode 520 of the group 500 and the second electrode 530 of the other electrode core group 500 is located in the package part 540.
  • the encapsulation part 540 isolates the plurality of pole core groups 500 to prevent the electrolyte between the plurality of pole core sets 500 from flowing mutually, and the plurality of pole core sets 500 will not affect each other, and the plurality of pole core sets 500 The electrolyte will not decompose due to excessive potential difference, ensuring the safety and service life of the battery.
  • the packaging part 540 can be implemented in various manners.
  • the packaging film 600 can be fastened by a cable tie to form the packaging part 540, or the packaging film 600 can be directly thermally fused to form the packaging part 540.
  • the specific manner of the packaging portion 540 is not particularly limited.
  • a plurality of pole core groups 500 may share the same packaging film 600.
  • a packaging part 540 is provided between each pole core group 500, wherein the packaging part 540 may be a counter electrode core group 500.
  • the packaging film 600 between is formed by thermal fusion connection.
  • the pole core group 500 has a first electrode 520 and a second electrode 530.
  • the series pole core sets 500 can be placed in the package.
  • the packaging film 600 On a part of the film 600, then another part of the packaging film 600 is folded in half toward the pole core group 500, and then the two parts of the packaging film 600 are heat-melted and sealed by a heat-melting process, thereby connecting the pole cores connected in series.
  • the group 500 is packaged in the same packaging film 600, and the packaging film 600 located in the upper and lower regions between the pole core groups 500 is also hot-melt extruded to form a single piece, thereby forming a diaphragm between the pole core groups 500.
  • the pole core group 500 is spaced apart.
  • the packaging film 600 includes a plurality of sub-package films 610 arranged at intervals, and each sub-package film 610 is packaged with a pole core group 500 to form a pole core assembly. In series.
  • the number of sub-encapsulation films 610 corresponds to the number of pole-core groups 500 one-to-one, and each pole-core group 500 is individually encapsulated in a sub-encapsulation film 610.
  • the preparation of multiple pole-core groups 500 is completed. After that, a sub-encapsulation film 610 can be separately sleeved outside each pole core group 500, and then the pole core components are connected in series.
  • the sub-encapsulation films 610 of the plurality of pole core groups are independent of each other, that is, each pole core group uses a sub-encapsulation film 610 to encapsulate the corresponding pole core group 500.
  • the first electrode 520 of the pole core group 500 and The second electrodes 530 are respectively led out from both ends of the pole core group 500 along the first direction A.
  • each pole core group 500 is connected in series through the first electrode 520 and the second electrode 530 drawn out.
  • a plurality of pole core groups 500 are connected in series in the casing 100 of the battery 10.
  • the plurality of pole core groups 500 are likely to move in the casing 100. Relative displacement between the pole core group 500 and the pole core set 500 or between the pole core and the pole core will cause damage to the pole core, for example, the current collector is broken, the diaphragm is wrinkled, the active material layer on the pole piece falls off, and the battery is stable Poor sex and prone to safety issues.
  • the air pressure between the metal housing 100 and the packaging film 600 is lower than the air pressure outside the metal housing 100.
  • air pressure is an abbreviation for atmospheric pressure. It is the atmospheric pressure acting on a unit area, which is equal to the weight of a vertical air column extending up to the upper boundary of the atmosphere per unit area.
  • the air pressure between the metal housing 100 and the packaging film 600 is also the air pressure in the space between the metal housing 100 and the packaging film 600.
  • the air pressure is lower than the air pressure outside the metal housing 100. Therefore, in the embodiments of the present application, ,
  • the metal shell 100 and the packaging film 600 are in a negative pressure state, so the metal shell 100 is dented or deformed under the action of atmospheric pressure, and the gap between the metal shell 100 and the pole core assembly 500 is reduced accordingly.
  • the space for the pole core group 500 to move or the mutual displacement is reduced, thereby reducing the movement of the pole core set 500 and the relative displacement between the pole core sets 500, and improving the stability of the battery 100 and the battery 100
  • the strength of the battery and the safety performance of the battery 100 is also the air pressure in the space between the metal housing 100 and the packaging film 600.
  • the air pressure is lower than the air pressure outside the metal housing 100. Therefore, in the embodiments of the present application, ,
  • the metal shell 100 and the packaging film 600 are in a negative pressure state,
  • the space between the metal casing 100 and the packaging film 600 can be evacuated to make the metal casing 100 and the packaging film 600 in a negative pressure state, thereby making the metal casing 100 and the internal
  • the pole core assembly 500 is as close as possible to reduce internal voids, prevent the pole core from moving in the metal shell, and at the same time prevent relative displacement between the pole cores, and reduce the occurrence of damage to the current collector, wrinkles of the diaphragm, and shedding of active materials. Improve the mechanical strength of the entire battery, extend the service life of the battery, and improve the safety performance of the battery.
  • the air pressure P1 between the metal casing 100 and the packaging film 600 wherein the value of P1 can be in the range of -100Kpa to -5Kpa, and further, the value of P1 can be in the range of -75Kpa to -20Kpa .
  • the index of P1 can be set according to actual needs.
  • the air pressure in the packaging film 600 is P2, where the relationship between P1 and P2 satisfies: P1>P2, and the range of P1/P2 is 0.05-0.85.
  • the value of P2 can be from -100Kpa to -20Kpa.
  • the pole core assembly 500 in the present technology adopts a secondary sealing mode.
  • the battery pole core assembly 500 is first encapsulated in the packaging film 600
  • the air pressure between the metal casing 100 and the packaging film 600 is greater than the air pressure in the packaging film 600.
  • the interface between the battery pole pieces is ensured, and the gap between the pole pieces is avoided. Lithium ions can conduct better.
  • the air pressure in the packaging film 600 is lower than the air pressure between the metal casing 100 and the packaging film 600.
  • the present application also provides a battery module, including a plurality of batteries as described in any one of the above.
  • the present application also provides a battery pack, which includes a plurality of batteries as described above or includes a plurality of battery modules as described above.
  • the application also provides an electric vehicle, which includes the above-mentioned battery module or the above-mentioned battery pack.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the present invention, “plurality” means two or more, unless otherwise specifically defined.
  • the terms “installed”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. , Or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components.
  • installed can be a fixed connection or a detachable connection. , Or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components.
  • the first feature “on” or “under” the second feature may be in direct contact with the first and second features, or the first and second features may be indirectly through an intermediary. touch.
  • the "above”, “above” and “above” of the first feature on the second feature may mean that the first feature is directly above or diagonally above the second feature, or it simply means that the level of the first feature is higher than that of the second feature.
  • the “below”, “below” and “below” of the second feature of the first feature may mean that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

La présente invention concerne une batterie (10). La batterie comprend un boîtier (100), un groupe de noyaux d'électrode (500), un collecteur d'informations de batterie (200), un ensemble d'échantillonnage (300) et un ensemble plaque de pressage (400), le boîtier (100) comprenant une plaque de couvercle (110) située au niveau d'une extrémité de la batterie, et le groupe de noyaux d'électrode (500) est situé à l'intérieur du boîtier (100) ; le collecteur d'informations de batterie (200) est utilisé pour collecter des informations du groupe de noyaux d'électrode (500) dans la batterie ; l'ensemble d'échantillonnage (300) est fixé sur la plaque de couvercle (110), est connecté au groupe de noyaux d'électrode (500) et le collecteur d'informations de batterie (200) dans la batterie, et est utilisé pour collecter les informations du groupe de noyaux d'électrode (500) dans la batterie et transmettre les informations au collecteur d'informations de batterie (200) ; et l'ensemble plaque de pressage (400) est utilisé pour fixer le collecteur d'informations de batterie (200) sur l'ensemble d'échantillonnage (300) et permettre au collecteur d'informations de batterie (200) d'être connecté électriquement à l'ensemble d'échantillonnage (300).
PCT/CN2021/074817 2020-02-12 2021-02-02 Batterie, module de batterie, bloc-batterie et véhicule électrique WO2021159994A1 (fr)

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