WO2023116077A1 - 电池单元、电池模组和车辆 - Google Patents

电池单元、电池模组和车辆 Download PDF

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Publication number
WO2023116077A1
WO2023116077A1 PCT/CN2022/118762 CN2022118762W WO2023116077A1 WO 2023116077 A1 WO2023116077 A1 WO 2023116077A1 CN 2022118762 W CN2022118762 W CN 2022118762W WO 2023116077 A1 WO2023116077 A1 WO 2023116077A1
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WO
WIPO (PCT)
Prior art keywords
pole
tab
positive
battery unit
negative
Prior art date
Application number
PCT/CN2022/118762
Other languages
English (en)
French (fr)
Inventor
袁万颂
王信月
段平安
温爱鹏
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 KR1020247013141A priority Critical patent/KR20240063985A/ko
Priority to EP22909395.0A priority patent/EP4395046A1/en
Publication of WO2023116077A1 publication Critical patent/WO2023116077A1/zh
Priority to US18/624,041 priority patent/US20240250394A1/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
    • H01M50/571—Methods or arrangements for affording protection against corrosion; Selection of materials therefor
    • 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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/147—Lids or covers
    • H01M50/155—Lids or covers characterised by the material
    • H01M50/157—Inorganic material
    • H01M50/159—Metals
    • 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
    • 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
    • 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
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch 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
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of battery technology, and more specifically, to a battery unit, a battery module using the battery unit, and a vehicle including the battery module.
  • the battery usually includes an aluminum shell and a battery cell installed inside the aluminum shell.
  • the aluminum shell is not charged. With the reaction inside the battery, lithium will react with the aluminum shell during the reaction, and lithium ions will be embedded in the aluminum to form an aluminum-lithium alloy. , causing corrosion to the aluminum shell and affecting the service life of the battery.
  • the positive tab and the negative tab are usually designed as a whole structure, and the positive tab and the negative tab are respectively arranged on two opposite short axes.
  • the positive cover plate of the prior art passes through the entire aluminum The case flows to the pole cover, and the DC impedance at this time includes the resistance of the aluminum case. And the impedance of the positive tab and the negative tab is also relatively large.
  • a battery unit comprising: a casing, a cavity is defined in the casing; a pole core, the pole core is arranged in the cavity, and the pole core includes a first pole An ear and a second ear, one of the first ear and the second ear is a positive ear, the other of the first ear and the second ear is a negative ear, the The positive tab is electrically connected to the housing, and the end of the first tab and/or the second tab away from the pole core each includes a plurality of spaced and distributed connection parts; the first pole, the The first pole is electrically connected to the first tab; the second pole is electrically connected to the second tab.
  • the pole core has a long axis and a short axis
  • the first tab is set on the long axis or the short axis
  • the second tab is set on the long axis or the short axis. the minor axis.
  • the pole core has two oppositely arranged long axes and two oppositely arranged short axes, the first pole lug is arranged on one of the long axes, and the second pole lug is arranged on one of the long axes.
  • one of the first pole and the second pole is a positive pole
  • the other of the first pole and the second pole is a negative pole, so Both the positive pole and the negative pole are arranged on one of the minor axes.
  • the battery unit further includes: a positive lead-out piece, and the positive lead-out piece is connected and electrically connected to the positive ear and the positive pole respectively.
  • the positive tab is a bent piece with an open slot
  • the battery unit further includes: a first insulating side plate, which is arranged in the open slot so that the At least a part of the positive tab is located between the first insulating side plate and the positive lead-out piece.
  • the first insulating side plate is connected to the pole core through an adhesive layer.
  • the battery unit further includes: a pole cover plate, the pole cover plate is arranged on one of the short axes, and the pole cover plate is provided with the positive pole and the The negative pole, the pole cover plate is respectively connected and electrically connected with the casing and the positive lead-out piece.
  • the battery unit further includes: an aluminum cover plate, the aluminum cover plate is arranged on the pole cover plate and is electrically connected to the housing, one end of the positive lead-out piece is connected to the The aluminum cover plate is connected, and the aluminum cover plate is electrically connected with the positive pole.
  • the positive lead-out piece extends along the long axis direction.
  • the battery unit further includes: a negative lead-out piece, and the negative lead-out piece is connected and electrically connected to the negative electrode ear and the negative pole respectively.
  • the negative tab is a bent piece with an open slot
  • the battery unit further includes: a second insulating side plate, the second insulating side plate is arranged in the open slot, so that At least a part of the negative tab is located between the second insulating side plate and the negative lead-out piece; a third insulating side plate is arranged on one of the short axes and is located on the negative lead-out between the sheet and the pole core, so that the negative lead-out sheet is insulated from the pole core.
  • the negative lead-out sheet includes: a first sheet extending along the long axis direction and connected to the negative tab; a second sheet, the first Two sheets extend along the short axis direction, and the second sheet is respectively connected to the first sheet, the third insulating side plate and the negative pole.
  • a plurality of the connecting parts are distributed at intervals along the extending direction of the long axis.
  • connection parts are connected in series.
  • the battery unit further includes: an explosion-proof valve cover plate, the explosion-proof valve cover plate is arranged on the short axis and is located on both sides of the long axis with the pole cover plate.
  • the size of the long axis is larger than the size of the short axis.
  • a battery module including the battery unit described in any one of the above embodiments.
  • a vehicle including the battery module described in any one of the above embodiments.
  • FIG. 1 is a schematic structural view of a battery according to an embodiment of the present application.
  • FIG. 2 is an exploded view of a battery according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a partial structure of a pole core according to an embodiment of the present application.
  • Fig. 4 is a schematic diagram of the connection between the first tab of the pole core and the positive lead-out sheet according to the embodiment of the present application.
  • Negative lead-out sheet 90 first sheet body 91 ; second sheet body 92 .
  • One purpose of the present application is to provide a new technical solution for the battery unit, which can solve the problems of easy corrosion of the shell and high battery impedance in the prior art.
  • Another object of the present application is to provide a new technical solution for a battery module, including the above-mentioned battery unit.
  • Another object of the present application is to provide a new technical solution for a vehicle, including the above-mentioned battery module.
  • the positive tab is electrically connected to the case, so that the case can be charged and corrosion of the case can be avoided.
  • the first tab and/or the second tab include a plurality of connecting parts, the current path can be optimized, and the DC resistance of the pole core can be reduced.
  • the battery unit 100 according to the embodiment of the present application will be described in detail below with reference to the accompanying drawings.
  • a battery unit 100 includes a casing 20 , a pole core 10 , a first pole 41 and a second pole 42 .
  • a cavity 21 is defined in the casing 20, and the pole core 10 is disposed in the cavity 21.
  • the pole core 10 includes at least one first pole lug 11 and at least one second pole lug 12, the first pole lug 11 and the second pole lug 12 One of the two pole lugs 12 is a positive pole lug, the other of the first pole lug 11 and the second pole lug 12 is a negative pole lug, the positive pole lug is electrically connected to the housing 20, the first pole lug 11 and/or the second pole lug 12
  • the ends of the lugs 12 away from the pole core 10 each include a plurality of connecting portions distributed at intervals, the first pole 41 is electrically connected to the first pole 11 , and the second pole 42 is electrically connected to the second pole 12 .
  • the battery unit 100 is mainly composed of the casing 20, the pole core 10, the first pole 41 and the second pole 42, and a chamber 21 is formed in the casing 20, and the chamber 21 has a capacity Positioning function, the pole core 10 is loaded in the cavity 21 .
  • the pole core 10 has a first pole lug 11 and a second pole lug 12 .
  • the polarities of the first tab 11 and the second tab 12 are opposite.
  • the first tab 11 is a positive tab
  • the second tab 12 is a negative tab
  • the first tab 11 is a negative tab
  • the second tab 11 is a negative tab.
  • Ear 12 is the positive pole ear.
  • the positive tab is electrically connected to the housing 20, so that the voltage of the housing 20 and the positive pole can be made the same, which means that the housing 20 is positively charged and the voltage is increased.
  • the shell 20 is an aluminum shell, and the voltage of the aluminum shell is increased. Lithium will not react with the high-voltage aluminum shell when it reacts. If the aluminum shell is not charged or negative pressure occurs, lithium ions will be embedded in the aluminum to form an aluminum-lithium alloy. , causing corrosion to the aluminum shell.
  • the end of the first tab 11 and/or the second tab 12 away from the pole core 10 each includes a plurality of connecting portions distributed at intervals. That is to say, at least one of the positive tab and the negative tab includes a plurality of connection parts, and the plurality of connection parts are distributed at intervals.
  • the connection portion corresponding to the first tab 11 may be defined as the first connection portion 111
  • the connection portion corresponding to the second tab 12 may be defined as the second connection portion 121 .
  • the pole core 10 of the present application can be mainly composed of the first pole piece, the first pole lug 11, the second pole piece, the second pole lug 12 and the diaphragm, the first pole piece is provided with the first pole lug 11, and the A second pole tab 12 is provided on the second pole piece, and a diaphragm is provided between the first pole piece and the second pole piece.
  • first tab 11 When the end of the first tab 11 or the second tab 12 close to the housing 20 and away from the pole core 10 may include a plurality of spaced and distributed connecting parts, the following situations are included, and the first tab 11 is taken as an example below illustrate:
  • the first end of the first tab 11 is connected to the first pole piece, the second end of the first tab 11 has a plurality of first connecting parts 111, and there is a separation groove between two adjacent first connecting parts 111, also That is to say, the first end of the first tab 11 is an integral structure, and the second end of the first tab 11 is a partition structure.
  • the first tab 11 is divided into a plurality of first connecting portions 111 , two adjacent first connecting portions 111 are spaced apart, and one end of each first connecting portion 111 is directly connected to the first pole piece.
  • the DC resistance (DCR) of the first tab 11 of the present application is smaller, which can reduce the size of the pole core 10.
  • the DCR the DC resistance
  • the second tab 12 adopts a plurality of second connecting portions 121 , which can also reduce the DCR, which will not be repeated here.
  • the polarity of the first tab 11 and the second tab 12 are opposite, no matter whether the first tab 11 is a positive tab or a negative tab, the end of the first tab 11 away from the first pole piece can be separated into multiple parts. a connection.
  • the battery unit 100 also includes a first pole 41 and a second pole 42, the first pole 41 is electrically connected to the first pole 11, and the second pole 42 is electrically connected to the second pole 12, which can function as Linkage.
  • the positive pole is connected to the positive pole, and the negative pole is connected to the negative pole.
  • the positive pole can be electrically connected to the positive pole through the casing 20 .
  • the positive tab is electrically connected to the case 20 , so that the case 20 can be charged and corrosion of the case 20 can be avoided.
  • the first tab 11 and/or the second tab 12 include a plurality of connection parts, the current path can be optimized, and the DC impedance of the pole core 10 can be reduced.
  • the pole core 10 has a major axis and a minor axis, the first tab 11 is disposed on the major axis or the minor axis, and the second pole lug 12 is disposed on the major axis or the minor axis.
  • the pole core 10 is roughly a rectangular piece with a major axis (i.e. the long side of the rectangle) and a minor axis (i.e. the short side of the rectangle), wherein the major axis extends along the first direction, and the minor axis extends along the second direction.
  • the one direction is substantially perpendicular to the second direction.
  • the pole core 10 has two relatively arranged major axes and two oppositely arranged short axes, the first tab 11 is arranged on one long axis, and the second pole The ear 12 is arranged on another long axis, one of the first pole 41 and the second pole 42 is a positive pole, the other of the first pole 41 and the second pole 42 is a negative pole, and the positive pole and the negative pole Columns are located on the minor axis. That is to say, the positive tab and the negative tab are respectively arranged on the long axis and on both sides of the short axis, and the positive tab and the negative tab are arranged opposite to each other.
  • the positive tab is set on the long axis, and the size of the long axis is larger than the size of the short axis.
  • the impedance reduction requirement for the pole core 10 in the first direction will be greater than the impedance reduction requirement for the pole core 10 in the second direction. Therefore, the first When the tab 11 is arranged on the long axis, it can ensure the effect of reducing impedance in the first direction; and the size of the short axis is limited, especially for blade batteries, it is convenient to arrange the first tab 11 in the direction of the long axis.
  • the advantages That is to say, by designing several connecting parts on the side of the pole core 10 in the length direction, it is beneficial to reduce the resistance of the entire pole core 10 , especially for blade batteries with a long length.
  • the negative tab is also arranged on the long axis, and the negative tab includes a plurality of connecting parts, which can further improve the effect of reducing impedance.
  • the positive cover plate of the prior art flows through the entire aluminum shell to the pole cover plate 40,
  • the DCR at this time includes the resistance of the aluminum case.
  • the current of the positive pole of the present application reaches the positive pole from the side, which can reduce the DCR of the aluminum shell.
  • the battery unit 100 further includes a positive lead-out piece 70 , and the positive lead-out piece 70 is connected and electrically connected to the positive ear and the positive pole respectively.
  • the first end of the positive lead-out piece 70 is connected to the connecting part of the positive electrode tab, and the second end of the positive lead-out piece 70 is connected to the positive pole.
  • the electrical connection between the positive tab and the positive pole can be realized through the positive lead-out sheet 70 .
  • the positive lead-out piece 70 can be made of aluminum, and the positive lead-out piece 70 can be welded together with the positive tab.
  • the positive tab is a bent part with a first opening groove 112
  • the battery unit 100 also includes a first insulating side plate 30, which is disposed on the first opening. slot 112 , so that at least a part of the positive tab is located between the first insulating side plate 30 and the positive lead-out piece 70 . That is to say, when assembling the battery unit 100, the positive tab can be bent.
  • the positive tab is formed into a shape similar to " ⁇ " with the first opening groove 112, or the positive tab is formed into a shape similar to " ⁇ ". ” shape, the positive tab cooperates with other components of the pole core 10 to form a first opening groove 112 .
  • the first insulating side plate 30 can support the positive tab after the positive tab is folded, that is, by using the first insulating side plate 30 It can prevent the positive tab from being over-pressed by the positive lead-out piece 70 , thereby improving the safety performance of the battery unit 100 .
  • the first insulating side plate 30 is connected to the pole core 10 through an adhesive layer. That is to say, the first insulating side plate 30 can be fixed on the pole core 10 by adhesive tape, which can prevent the pole core 10 from moving inside the battery unit 100 .
  • the battery unit 100 also includes a pole cover 40, the pole cover 40 is arranged on the short axis, and the pole cover 40 is provided with a positive pole and a negative pole.
  • the pole cover plate 40 is respectively connected and electrically connected with the casing 20 and the positive lead-out piece 70 . That is to say, installing the positive pole and the negative pole on the pole cover 40 at the same time is beneficial to processing and production.
  • installing the positive pole and the negative pole on the pole cover 40 at the same time is beneficial to processing and production.
  • the positive tab by arranging the positive tab on the side, and the positive tab has a connecting portion, the positive current will directly reach the pole cover plate 40 from the side, reducing the DCR of the housing 20 .
  • the positive lead-out piece 70 extends along the long axis direction, which not only facilitates the connection between the positive lead-out piece 70 and the positive pole, shortens the length of the required positive lead-out piece 70, but also facilitates
  • the positive lead-out piece 70 is connected to the positive tab also extending along the long axis.
  • the battery unit 100 further includes an aluminum cover plate 43, the aluminum cover plate 43 is arranged on the pole cover plate 40 and is electrically connected with the housing 20, and the second end of the positive electrode lead piece 70 is connected to the aluminum cover plate The plate 43 is connected, and the aluminum cover plate 43 is electrically connected with the positive pole.
  • the positive lead-out piece 70 is welded to the positive tab, it is welded together with the aluminum cover plate 43 to conduct to the positive pole.
  • the battery unit 100 further includes a negative lead-out piece 90 , and the negative lead-out piece 90 is respectively connected and electrically connected to the negative electrode ear and the negative pole. That is to say, the first end of the negative electrode tab can be connected to the negative pole piece, and the second end of the negative pole tab has a plurality of connection parts, and the plurality of connection parts are connected to the negative electrode lead-out piece 90, and the negative electrode lead-out piece 90 is connected to the negative pole post to realize the negative pole.
  • the electrical connection between the sheet and the negative pole, that is, the negative lead-out sheet 90 is conducted to the negative pole.
  • the negative lead-out piece 90 can be made of copper, and the negative lead-out piece 90 can be welded together with the negative tab.
  • the negative tab is a bent piece with a second open slot 122
  • the battery unit 100 further includes a second insulating side plate 60 , which is arranged on The second opening groove 122, so that at least a part of the negative electrode tab is located between the second insulating side plate 60 and the negative electrode lead-out piece 90, the second insulating side plate 60 can play a supporting role, and can prevent the negative electrode ear from being affected by the negative electrode lead-out piece 90 Over squeezed.
  • the second insulating side plate 60 is connected to the pole core 10 through an adhesive layer. That is to say, the second insulating side plate 60 can be fixed on the pole core 10 by adhesive tape, which can prevent the pole core 10 from moving inside the battery unit 100 .
  • the battery unit 100 further includes a third insulating side plate 80, the third insulating side plate 80 is arranged on the short axis and between the negative lead-out piece 90 and the pole core 10, so that The negative electrode lead piece 90 is insulated from the pole core 10 to avoid short circuit.
  • the third insulating side plate 80 can be an insulating film, and the insulating film can be arranged in a circle along the length direction of the cell, which can play an insulating role for the negative lead-out piece 90 .
  • the housing 20 may include a lower part 22 and an upper cover 23 , the lower part 22 is provided with a groove, and a cavity 21 is formed between the lower part 22 and the upper cover 23 . After covering the insulating film, the lower part 22 can be inserted to complete the welding of the lower part 22 and the upper cover 23 .
  • the dimension of the long axis of the pole core 10 is 700mm-800mm
  • the dimension of the short axis is about 100mm
  • the dimension of the first connecting part 111 of the positive tab along the long axis is 30mm-50mm.
  • the welding seam of the first connecting portion 111 welded to the positive lead-out sheet 70 is kept at 26mm-46mm, and if the welding seam is too large, it is easy to be welded through.
  • the distance between two adjacent first connecting parts 111 arranged along the long axis direction is kept at 80mm-100mm.
  • the size of the second connecting portion 121 of the negative tab along the long axis is 30mm-50mm.
  • the weld seam of the second connecting portion 121 welded to the negative lead-out piece 90 is maintained at 26mm-46mm.
  • the distance between two adjacent second connecting parts 121 along the long axis direction is kept at 80mm-100mm.
  • the number of the second connecting parts 121 can be adjusted according to the length of the battery.
  • the positive tab and the negative tab can be drawn out from the side of the longer blade battery, which can achieve the purpose of optimizing the current path and reducing the internal resistance of the battery.
  • the positive tab is welded on the positive lead-out piece 70, and the negative tab is welded on the negative lead-out piece 90.
  • the thickness of the positive lead-out piece 70 and the negative lead-out piece 90 can be kept at 1mm-2mm. It can reduce the degree of deformation caused by welding while ensuring the welding strength.
  • the positive tab conducts electricity to the positive pole through the positive lead-out piece 70
  • the negative pole conducts electricity to the negative pole through the negative lead-out piece 90 to form a current path.
  • the negative lead-out piece 90 includes a first piece 91 and a second piece 92.
  • the first piece 91 extends along the long axis and is connected to the negative ear.
  • the body 92 extends along the short axis direction, and the second sheet body 92 is respectively connected with the first sheet body 91, the third insulating side plate 80 and the negative pole, and the first sheet body 91 and the second sheet body 92 can be formed by bending .
  • the negative lead-out piece 90 may be bent and welded to the lower surface of the pole cover plate 40 after the negative lead-out piece 90 is welded to the negative tab.
  • the negative lead-out piece 90 by dividing the negative lead-out piece 90 into the first piece 91 and the second piece 92, not only can the negative lead-out piece 90 be connected to the negative tab, but also can be connected to the negative pole without occupying Too much space.
  • a plurality of connecting parts are distributed at intervals along the extension direction of the long axis, which is beneficial to processing and production.
  • a plurality of connection parts are distributed along the first direction at intervals, which not only facilitates the simultaneous connection of the positive lead-out sheet 70 to the multiple connection parts, but also facilitates the installation of the first insulating side plate 30. , and can also reduce the impedance.
  • a plurality of connection parts are connected in series.
  • the pole core 10 When the pole core 10 is applied to the battery unit 100, the first tab 11 can be connected to the housing 20 through the positive lead-out piece 70 to realize charging of the housing 20.
  • the positive lead-out sheet 70 by adopting multiple connecting portions connected in series, it is beneficial for the positive lead-out sheet 70 to be electrically connected to multiple first connecting portions 111 at the same time.
  • the negative lead-out piece 90 to be electrically connected to multiple second connecting portions 121 at the same time, and details are not described here.
  • the battery unit 100 further includes an explosion-proof valve cover 50 , the explosion-proof valve cover 50 is disposed on the short axis and the pole cover 40 is located on both sides of the long axis.
  • a sealed cavity 21 can be enclosed by the casing 20 , the pole cover 40 and the explosion-proof valve cover 50 by welding.
  • the battery unit 100 according to the present application will be described in detail below in conjunction with specific embodiments.
  • the housing 20 includes a lower part 22 and an upper cover 23 , the shape of the housing 20 is consistent with that of the pole core 10 , and the pole core 10 is a rectangular piece.
  • the pole core 10 has a long axis and a short axis, the long axis extends in the horizontal direction, and the short axis extends in the vertical direction.
  • Positive tabs protrude from the upper side of the pole core 10 , the positive tabs have a plurality of first connecting portions 111 , and negative tabs protrude from the lower side of the pole core 10 .
  • a pole cover 40 is provided on the left side of the lower part 22 , and an explosion-proof valve cover 50 is provided on the right side of the lower part 22 .
  • a positive pole and a negative pole are arranged on the pole cover 40 , and an aluminum cover 43 is arranged on the pole cover 40 .
  • the second connecting portion 121 is welded to the negative lead-out piece 90
  • the first connecting portion 111 is formed as a bent piece
  • the upper surface of the first connecting portion 111 is welded to the positive lead-out piece 70 .
  • the current path of the battery unit 100 can be: positive post-aluminum cover plate 43-positive lead-out piece 70-positive tab-positive plate-negative plate-negative tab-negative lead-out piece 90-negative post.
  • the battery unit 100 has the characteristics that the casing 20 is charged and over-current, and has the effect of reducing the internal resistance of the battery and preventing corrosion.
  • the embodiment of the present application also provides a battery module, which includes the battery unit 100 described in any one of the above embodiments. Since the battery unit 100 according to the embodiment of the present application prolongs the life of the casing 20 and reduces the battery impedance, the battery module according to the embodiment of the present application also has the above advantages, which will not be repeated here.
  • the embodiment of the present application also provides a vehicle, the vehicle includes the battery module of any one of the above embodiments, because the battery module according to the embodiment of the present application prolongs the life of the casing 20 and reduces the battery impedance, so according to the
  • the battery module of the embodiment of the application also has the above-mentioned advantages, which will not be repeated here.

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Abstract

一种电池单元、电池模组和车辆。电池单元包括：壳体（20）、极芯（10）、第一极柱（41）和第二极柱（42）。该壳体内限定有腔室（21），极芯设于腔室，极芯包括第一极耳（11）和第二极耳（12），第一极耳（11）与第二极耳（12）中的一个为正极耳，第一极耳与第二极耳中的另一个为负极耳，正极耳与壳体（20）电连接，第一极耳和/或第二极耳远离极芯的一端均包括多个间隔开分布的连接部；第一极柱（41）与第一极耳（11）电连接；第二极柱（42）与第二极耳（12）电连接。

Description

电池单元、电池模组和车辆
本申请要求于2021年12月21日提交中国专利局、申请号为202123237116.1、发明名称为“电池单元、电池模组和车辆”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，更具体地，涉及一种电池单元、应用该电池单元的电池模组、包括该电池模组的车辆。
背景技术
电池通常包括铝壳和安装在铝壳内部的电芯，铝壳通不带电，随着电池内部发生反应，锂在反应时会与铝壳反应，锂离子会嵌到铝里面，形成铝锂合金，对于铝壳造成腐蚀，影响电池的使用寿命。
此外，现有技术中通常将正极耳和负极耳分别设计为一整片结构，且将正极耳和负极耳分别设置在两个相对设置的短轴上，现有技术的正极盖板通过整个铝壳过流到极柱盖板，此时的直流阻抗包括了铝壳的电阻。且正极耳和负极耳的阻抗也较大。
发明内容
根据本申请的一个目的，提供了一种电池单元，包括：壳体，所述壳体内限定有腔室；极芯，所述极芯设于所述腔室，所述极芯包括第一极耳和第二极耳，所述第一极耳与所述第二极耳中的一个为正极耳，所述第一极耳与所述第二极耳中的另一个为负极耳，所述正极耳与所述壳体电连接，所述第一极耳和/或所述第二极耳远离所述极芯的一端均包括多个间隔开分布的连接部；第一极柱，所述第一极柱与所述第一极耳电连接；第二极柱，所述第二极柱与所述第二极耳电连接。
在本申请一实施例中，所述极芯具有长轴和短轴，所述第一极耳设于所述长轴或所述短轴，所述第二极耳设于所述长轴或所述短轴。
在本申请一实施例中，所述极芯具有两个相对设置的长轴和两个相对设置的短轴，所述第一极耳设于一个所述长轴，所述第二极耳设于另一个所述长轴，所述第一极柱和所述第二极柱中的一个为正极柱，所述第一极柱和所述第二极柱中的另一个为负极柱，所述正极柱和所述负极柱均设于一个所述短轴。
在本申请一实施例中，所述电池单元还包括：正极引出片，所述正极引出片分别与所述正极耳和所述正极柱连接且电连接。
在本申请一实施例中，所述正极耳为具有开口槽的折弯件，所述电池单元还包括：第一绝缘侧板，第一绝缘侧板设于所述开口槽，以使所述正极耳的至少一部分位于所述第一绝缘侧板和所述正极引出片之间。
在本申请一实施例中，所述第一绝缘侧板与所述极芯通过胶粘层连接。
在本申请一实施例中，所述电池单元还包括：极柱盖板，所述极柱盖板设于一个所述短 轴，所述极柱盖板上设有所述正极柱和所述负极柱，所述极柱盖板分别与所述壳体和所述正极引出片连接且电连接。
在本申请一实施例中，所述电池单元还包括：铝盖板，所述铝盖板设于所述极柱盖板且与所述壳体电连接，所述正极引出片的一端与所述铝盖板连接，所述铝盖板与所述正极柱电连接。
在本申请一实施例中，所述正极引出片沿长轴方向延伸。
在本申请一实施例中，所述电池单元还包括：负极引出片，所述负极引出片分别与所述负极耳和所述负极柱连接且电连接。
在本申请一实施例中，所述负极耳为具有开口槽的折弯件，所述电池单元还包括：第二绝缘侧板，所述第二绝缘侧板设于所述开口槽，以使所述负极耳的至少一部分位于所述第二绝缘侧板和所述负极引出片之间；第三绝缘侧板，所述第三绝缘侧板设于一个所述短轴且位于所述负极引出片和所述极芯之间，以使所述负极引出片与所述极芯绝缘。
在本申请一实施例中，所述负极引出片包括：第一片体，所述第一片体沿所述长轴方向延伸，且与所述负极耳连接；第二片体，所述第二片体沿所述短轴方向延伸，所述第二片体分别与所述第一片体、所述第三绝缘侧板和所述负极柱连接。
在本申请一实施例中，多个所述连接部沿延伸的所述长轴方向间隔开分布。
在本申请一实施例中，多个所述连接部串联连接。
在本申请一实施例中，所述电池单元还包括：防爆阀盖板，所述防爆阀盖板设于所述短轴且和所述极柱盖板位于所述长轴的两侧。
在本申请一实施例中，所述长轴的尺寸大于所述短轴的尺寸。
根据本申请的又一个目的，提供了一种电池模组，包括上述任一实施例所述的电池单元。
根据本申请的又一个目的，提供了一种车辆，包括上述任一实施例所述的电池模组。
通过以下参照附图对本申请的示例性实施例的详细描述，本申请的其它特征及其优点将会更加显而易见。
附图说明
被结合在说明书中并构成说明书的一部分的附图示出了本申请的实施例，并且连同其说明一起用于解释本申请的原理。
图1是根据本申请的实施例的电池的结构示意图；
图2是根据本申请的实施例的电池的爆炸图；
图3是根据本申请的实施例的极芯的局部结构示意图；
图4是根据本申请的实施例的极芯的第一极耳与正极引出片的连接示意图。
附图标记
电池100；
极芯10；
第一极耳11；第一连接部111；第一开口槽112；
第二极耳12；第二连接部121；第二开口槽122；
壳体20；腔室21；下部22；上盖23；
第一绝缘侧板30；
极柱盖板40；
第一极柱41；第二极柱42；铝盖板43；
防爆阀盖板50；
第二绝缘侧板60；
正极引出片70；
第三绝缘侧板80；
负极引出片90；第一片体91；第二片体92。
具体实施方式
现在将参照附图来详细描述本申请的各种示例性实施例。应注意到：除非另外具体说明，否则在这些实施例中阐述的部件和步骤的相对布置、数字表达式和数值不限制本申请的范围。
以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本申请及其应用或使用的任何限制。
对于相关领域普通技术人员已知的技术、方法和设备可能不作详细讨论，但在适当情况下，所述技术、方法和设备应当被视为说明书的一部分。
在这里示出和讨论的所有例子中，任何具体值应被解释为仅仅是示例性的，而不是作为限制。因此，示例性实施例的其它例子可以具有不同的值。
应注意到：相似的标号和字母在下面的附图中表示类似项，因此，一旦某一项在一个附图中被定义，则在随后的附图中不需要对其进行进一步讨论。
本申请的一个目的是提供一种电池单元的新技术方案，能够解决现有技术中壳体易于腐蚀和电池阻抗大的问题。
本申请的又一个目的是提供一种电池模组的新技术方案，包括上述电池单元。
本申请的又一个目的是提供一种车辆的新技术方案，包括上述电池模组。
根据本申请的实施例，将正极耳与壳体电连接，能够实现壳体带电，避免壳体腐蚀。通过使第一极耳和/或第二极耳包括多个连接部，可以优化电流路径，能够降低极芯的直流阻抗。
下面结合附图对根据本申请实施例的电池单元100进行详细说明。
如图1至图4所示，根据本申请实施例的电池单元100包括壳体20、极芯10、第一极柱41和第二极柱42。
具体而言，壳体20内限定有腔室21，极芯10设于腔室21，极芯10包括至少一个第一极耳11和至少一个第二极耳12，第一极耳11与第二极耳12中的一个为正极耳，第一极耳11与第二极耳12中的另一个为负极耳，正极耳与壳体20电连接，第一极耳11和/或第二极耳12远离极芯10的一端均包括多个间隔开分布的连接部，第一极柱41与第一极耳11电连接，第二极柱42与第二极耳12电连接。
换言之，根据本申请实施例的电池单元100主要由壳体20、极芯10、第一极柱41和第二极柱42组成，在壳体20内形成有腔室21，腔室21具有容置作用，在腔室21内装载有极芯10。极芯10具有第一极耳11和第二极耳12。第一极耳11和第二极耳12的极性相反，当第一极耳11为正极耳时，第二极耳12为负极耳；当第一极耳11为负极耳时，第二极耳12为正极耳。
其中，正极耳与壳体20电连接，能够使壳体20和正极的电压一样，相当于壳体20带正电，提高电压。例如壳体20为铝壳，铝壳的电压提高，锂在反应时不会与高电压的铝壳反应， 如果铝壳不带电或者出现负压，锂离子会嵌到铝里面，形成铝锂合金，对于铝壳造成腐蚀。
第一极耳11和/或第二极耳12远离极芯10的一端均包括多个间隔开分布的连接部。也就是说，正极耳和负极耳中的至少一个包括多个连接部，多个连接部间隔开分布。为了便于描述，可以将第一极耳11对应的连接部定义为第一连接部111，将第二极耳12对应的连接部定义为第二连接部121。
其中，本申请的极芯10可以主要由第一极片、第一极耳11、第二极片、第二极耳12和隔膜组成，在第一极片上设有第一极耳11，在第二极片上设有第二极耳12，在第一极片和第二极片之间设有隔膜。
在第一极耳11或第二极耳12靠近壳体20且远离极芯10的一端可以包括多个间隔开分布的连接部时包括以下多种情况，下面以第一极耳11为例进行说明：
情况一
第一极耳11的第一端与第一极片连接，第一极耳11的第二端具有多个第一连接部111，相邻两个第一连接部111之间具有分隔槽，也就是说，第一极耳11的第一端为一个整体结构，第一极耳11的第二端为分隔结构。
情况二
第一极耳11被分隔为多个第一连接部111，相邻两个第一连接部111之间间隔开分布，每个第一连接部111的一端直接与第一极片连接。
无论是情况一还是情况二，相对于现有技术中的一整片的第一极耳11而言，本申请的第一极耳11的直流阻抗(DCR)更小，能够减小极芯10的DCR。同样的，第二极耳12采用多个第二连接部121，也能够降低DCR，在此不作赘述。此外，第一极耳11与第二极耳12的极性相反，无论第一极耳11是正极耳还是负极耳，均可以将第一极耳11远离第一极片的端部分隔为多个连接部。
此外，电池单元100还包括第一极柱41和第二极柱42，第一极柱41与第一极耳11电连接，第二极柱42与第二极耳12电连接，能够起到联结作用。其中，与正极耳连接的为正极柱，与负极耳连接的为负极柱，正极柱可以通过壳体20与正极耳电连接。
由此，根据本申请实施例的电池单元100，将正极耳与壳体20电连接，能够实现壳体20带电，避免壳体20腐蚀。通过使第一极耳11和/或第二极耳12包括多个连接部，可以优化电流路径，能够降低极芯10的直流阻抗。
根据本申请的实施例，极芯10具有长轴和短轴，第一极耳11设于长轴或短轴，第二极耳12设于长轴或短轴。在第一极耳11设置在长轴时，第二极耳12可以设置在长轴或者短轴；在第一极耳11设置在短轴时，第二极耳12可以设置在长轴或者短轴。例如，极芯10大致为类矩形件，具有长轴(即矩形的长边)和短轴(即矩形的短边)，其中长轴沿第一方向延伸，短轴沿第二方向延伸，第一方向与第二方向大体垂直设置。
在本申请的一些具体实施方式中，如图3所示，极芯10具有两个相对设置的长轴和两个相对设置的短轴，第一极耳11设于一个长轴，第二极耳12设于另一个长轴，第一极柱41和第二极柱42中的一个为正极柱，第一极柱41和第二极柱42中的另一个为负极柱，正极柱和负极柱均设于短轴。也就是说，正极耳和负极耳分别设置在长轴上且位于短轴的两侧，且正极耳和负极耳相对设置。
将正极耳设置在长轴，长轴的尺寸大于短轴的尺寸，对于第一方向的极芯10的降阻抗需求会大于对于第二方向的极芯10的降阻抗需求，因此在将第一极耳11设置在长轴上时，能够保证对于第一方向的降阻抗效果；而且短轴的尺寸有限，特别是对于刀片电池而言，将第 一极耳11设置在长轴方向具有便于设置的优点。也就是说，通过在极芯10的长度方向的侧面设计有若干个连接部，有利于整个极芯10的电阻的降低，特别是对于长度较长的刀片电池。同样的，将负极耳也设置在长轴，且负极耳包括多个连接部，能够进一步提高降阻抗效果。
相对于现有技术中的将正极耳和负极耳分别设置在两个相对设置的短轴上的方案而言，现有技术的正极盖板通过整个铝壳过流来到极柱盖板40，此时的DCR包括了铝壳的电阻。而本申请的正极的电流从侧面到达正极柱，能够减少铝壳的DCR。
根据本申请的实施例，如图4所示，电池单元100还包括正极引出片70，正极引出片70分别与正极耳和正极柱连接且电连接。例如，正极引出片70的第一端与正极耳的连接部连接，正极引出片70的第二端与正极柱连接。在本实施例中，通过正极引出片70可以实现正极耳和正极柱之间的电连接。其中正极引出片70可以为铝材，正极引出片70可以与正极耳焊接在一起。
根据本申请的实施例，如图2所示，正极耳为具有第一开口槽112的折弯件，电池单元100还包括第一绝缘侧板30，第一绝缘侧板30设于第一开口槽112，以使正极耳的至少一部分位于第一绝缘侧板30和正极引出片70之间。也就是说，在组装电池单元100时，可将正极耳折弯，此时正极耳形成为类“匚”字形，“匚”字形具有第一开口槽112，或者，正极耳形成为类“乛”字形，正极耳与极芯10的其他部件配合形成有第一开口槽112。
在本实施例中，通过在正极耳中设置有第一绝缘侧板30，在正极耳折叠后第一绝缘侧板30对正极耳有支撑作用，也就是说，通过采用第一绝缘侧板30能够防止正极耳受到正极引出片70的过度挤压，从而提高电池单元100的安全性能。
根据本申请的实施例，第一绝缘侧板30与极芯10通过胶粘层连接。也就是说，第一绝缘侧板30可以通过胶带固定在极芯10上，能够防止极芯10在电池单元100内部窜动。
在本申请的一些具体实施方式中，如图2所示，电池单元100还包括极柱盖板40，极柱盖板40设于短轴，极柱盖板40上设有正极柱和负极柱，极柱盖板40分别与壳体20和正极引出片70连接且电连接。也就是说，将正极柱和负极柱同时安装在极柱盖板40上，有利于加工生产。此外，通过在侧面设置正极耳，且正极耳具有连接部，正极的电流将会从侧面直接到达极柱盖板40，减少了壳体20的DCR。
根据本申请的实施例，如图4所示，正极引出片70沿长轴方向延伸，不仅能够有利于正极引出片70与正极柱连接，缩短所需正极引出片70的长度，而且还有利于正极引出片70与同样沿长轴延伸的正极耳连接。
在本申请的一些具体实施方式中，电池单元100还包括铝盖板43，铝盖板43设于极柱盖板40且与壳体20电连接，正极引出片70的第二端与铝盖板43连接，铝盖板43与正极柱电连接。在生产时，将正极引出片70与正极耳焊接后，与铝盖板43焊接在一起，导通到正极柱。
根据本申请的实施例，如图4所示，电池单元100还包括负极引出片90，负极引出片90分别与负极耳和负极柱连接且电连接。也就是说，负极耳的第一端可以与负极片连接，负极耳的第二端具有多个连接部，多个连接部与负极引出片90连接，负极引出片90与负极柱连接，实现负极片和负极柱之间的电连接，即负极引出片90导通到负极柱。负极引出片90可以是铜材，负极引出片90可以与负极耳焊接在一起。
在本申请的一些具体实施方式中，如图2所示，负极耳为具有第二开口槽122的折弯件，电池单元100还包括第二绝缘侧板60，第二绝缘侧板60设于第二开口槽122，以使负极耳的至少一部分位于第二绝缘侧板60和负极引出片90之间，第二绝缘侧板60能够起到支撑作用， 能够避免负极耳受到负极引出片90的过度挤压。
根据本申请的实施例，第二绝缘侧板60与极芯10通过胶粘层连接。也就是说，第二绝缘侧板60可以通过胶带固定在极芯10上，能够防止极芯10在电池单元100内部窜动。
根据本申请的实施例，如图2所示，电池单元100还包括第三绝缘侧板80，第三绝缘侧板80设于短轴且位于负极引出片90和极芯10之间，以使负极引出片90与极芯10绝缘，能够避免短路。其中第三绝缘侧板80可以为绝缘膜，绝缘膜可以沿电芯的长度方向设置一圈，能够起到对于负极引出片90的绝缘作用。壳体20可以包括下部22和上盖23，下部22设有槽，下部22和上盖23之间配合形成有腔室21。在包覆绝缘膜后，可以套入下部22，完成下部22和上盖23的焊接。
根据本申请的实施例，极芯10的长轴方向的尺寸为700mm-800mm，短轴的尺寸为100mm左右，正极耳的第一连接部111沿长轴方向的尺寸为30mm-50mm。第一连接部111焊接在正极引出片70上的焊缝保持在26mm-46mm，焊缝如果太大容易焊穿。沿长轴方向的相邻设置的两个第一连接部111之间的间距保持在80mm-100mm。
同样的，负极耳的第二连接部121沿长轴方向的尺寸为30mm-50mm。第二连接部121焊接在负极引出片90上的焊缝保持在26mm-46mm。沿长轴方向的相邻设置的两个第二连接部121之间的间距保持在80mm-100mm。第二连接部121的数量可以根据电池的长度进行调整。
通过采用上述设计，能够对较长的刀片电池的侧面引出正极耳和负极耳，可以达到优化电流路径，减小电池内阻的目的。
在本申请的一些具体实施方式中，正极耳焊接在正极引出片70上，负极耳焊接在负极引出片90上，正极引出片70和负极引出片90的厚度可以保持在1mm-2mm，此厚度可以在保证焊接强度的同时，降低焊接导致的形变程度。正极耳通过正极引出片70导电至正极柱上，负极耳通过负极引出片90导电至负极柱上，形成电流通路。
根据本申请的实施例，如图2所示，负极引出片90包括第一片体91和第二片体92，第一片体91沿长轴方向延伸，且与负极耳连接，第二片体92沿短轴方向延伸，第二片体92分别与第一片体91、第三绝缘侧板80和负极柱连接，可以通过折弯的方式形成第一片体91和第二片体92。在生产时，可以在将负极引出片90与负极耳焊接后，将负极引出片90折弯焊接在极柱盖板40的下表面。
在本实施例中，通过将负极引出片90分为第一片体91和第二片体92，不仅能够实现负极引出片90与负极耳连接，而且还能够与负极柱连接，并且不会占用过大的空间。
在本申请的一些具体实施方式中，如图4所示，多个连接部沿长轴的延伸方向间隔开分布，有利于加工生产。在极芯10应用于电池单元100时，将多个连接部沿第一方向间隔开分布，不仅有利于正极引出片70同时与多个连接部连接，而且有利于第一绝缘侧板30的安装，并且还能够减小阻抗。
根据本申请的实施例，多个连接部串联连接，在将极芯10应用于电池单元100中时，可以将第一极耳11通过正极引出片70与壳体20连接，实现壳体20带电。在本实施例中，通过采用串联连接的多个连接部，有利于正极引出片70同时与多个第一连接部111电连接。同样的，有利于负极引出片90同时与多个第二连接部121电连接，在此不作赘述。
根据本申请的实施例，电池单元100还包括防爆阀盖板50，防爆阀盖板50设于短轴且和极柱盖板40位于长轴的两侧。其中，通过壳体20、极柱盖板40和防爆阀盖板50可以通过焊接围合有密闭的腔室21。
下面结合具体实施例对根据本申请的电池单元100进行详细说明。
壳体20包括下部22和上盖23，壳体20的形状与极芯10的形状一致，极芯10为矩形件。极芯10具有长轴和短轴，长轴沿水平方向延伸，短轴沿上下方向延伸。在极芯10的上侧面伸出有正极耳，正极耳具有多个第一连接部111，在极芯10的下侧面伸出有负极耳。在下部22的左侧面设有极柱盖板40，在下部22的右侧面设有防爆阀盖板50。在极柱盖板40上设有正极柱和负极柱，极柱盖板40上设有铝盖板43。
在电池单元100装配完成后，第二连接部121与负极引出片90焊接，第一连接部111形成为折弯件，第一连接部111的上表面与正极引出片70焊接。电池单元100的电流通道可为：正极柱-铝盖板43-正极引出片70-正极耳-正极片-负极片-负极耳-负极引出片90-负极柱。
总而言之，根据本申请实施例的电池单元100具有壳体20带电且过流的特性，具有减小电池内阻，防腐蚀的效果。
本申请实施例还提供了一种电池模组，该电池模组包括上述任一实施例所述的电池单元100。由于根据本申请实施例的电池单元100延长了壳体20的寿命，降低了电池阻抗，因此根据本申请实施例的电池模组也具有上述优点，在此不作赘述。
本申请实施例还提供了一种车辆，该车辆包括上述任一实施例的电池模组，由于根据本申请实施例的电池模组延长了壳体20的寿命，降低了电池阻抗，因此根据本申请实施例的电池模组也具有上述优点，在此不作赘述。
虽然已经通过例子对本申请的一些特定实施例进行了详细说明，但是本领域的技术人员应该理解，以上例子仅是为了进行说明，而不是为了限制本申请的范围。本领域的技术人员应该理解，可在不脱离本申请的范围和精神的情况下，对以上实施例进行修改。本申请的范围由所附权利要求来限定。

Claims (18)

  1. 一种电池单元(100)，其特征在于，包括：
    壳体(20)，所述壳体(20)内限定有腔室(21)；
    极芯(10)，所述极芯(10)设于所述腔室(21)，所述极芯(10)包括第一极耳(11)和第二极耳(12)，所述第一极耳(11)与所述第二极耳(12)中的一个为正极耳，所述第一极耳(11)与所述第二极耳(12)中的另一个为负极耳，所述正极耳与所述壳体(20)电连接，所述第一极耳(11)和/或所述第二极耳(12)远离所述极芯(10)的一端均包括多个间隔开分布的连接部(111，121)；
    第一极柱(41)，所述第一极柱(41)与所述第一极耳(11)电连接；
    第二极柱(42)，所述第二极柱(42)与所述第二极耳(12)电连接。
  2. 根据权利要求1所述的电池单元(100)，其特征在于，所述极芯(10)具有长轴和短轴，所述第一极耳(11)设于所述长轴或所述短轴，所述第二极耳(12)设于所述长轴或所述短轴。
  3. 根据权利要求1或2所述的电池单元(100)，其特征在于，所述极芯(10)具有两个相对设置的长轴和两个相对设置的短轴，所述第一极耳(11)设于一个所述长轴，所述第二极耳(12)设于另一个所述长轴，所述第一极柱(41)和所述第二极柱(42)中的一个为正极柱，所述第一极柱(41)和所述第二极柱(42)中的另一个为负极柱，所述正极柱和所述负极柱均设于一个所述短轴。
  4. 根据权利要求1-3中任一项所述的电池单元(100)，其特征在于，还包括：
    正极引出片(70)，所述正极引出片(70)分别与所述正极耳和所述正极柱连接且电连接。
  5. 根据权利要求1-4中任一项所述的电池单元(100)，其特征在于，所述正极耳为具有第一开口槽(112)的折弯件，所述电池单元(100)还包括：
    第一绝缘侧板(30)，第一绝缘侧板(30)设于所述第一开口槽(112)，以使所述正极耳的至少一部分位于所述第一绝缘侧板(30)和所述正极引出片(70)之间。
  6. 根据权利要求1-5中任一项所述的电池单元(100)，其特征在于，所述第一绝缘侧板(30)与所述极芯(10)通过胶粘层连接。
  7. 根据权利要求1-6中任一项所述的电池单元(100)，其特征在于，还包括：
    极柱盖板(40)，所述极柱盖板(40)设于一个所述短轴，所述极柱盖板(40)上设有所述正极柱和所述负极柱，所述极柱盖板(40)分别与所述壳体(20)和所述正极引出片(70)连接且电连接。
  8. 根据权利要求1-7中任一项所述的电池单元(100)，其特征在于，还包括：
    铝盖板(43)，所述铝盖板(43)设于所述极柱盖板(40)且与所述壳体(20)电连接，所述正极引出片(70)的一端与所述铝盖板(43)连接，所述铝盖板(43)与所述正极柱电连接。
  9. 根据权利要求1-8中任一项所述的电池单元(100)，其特征在于，所述正极引出片(70)沿长轴方向延伸。
  10. 根据权利要求1-9中任一项所述的电池单元(100)，其特征在于，还包括：
    负极引出片(90)，所述负极引出片(90)分别与所述负极耳和所述负极柱连接且电连接。
  11. 根据权利要求1-10中任一项所述的电池单元(100)，其特征在于，所述负极耳为具有第二开口槽(122)的折弯件，所述电池单元(100)还包括：
    第二绝缘侧板(60)，所述第二绝缘侧板(60)设于所述第二开口槽(122)，以使所述负极耳的至少一部分位于所述第二绝缘侧板(60)和所述负极引出片(90)之间；
    第三绝缘侧板(80)，所述第三绝缘侧板(80)设于一个所述短轴且位于所述负极引出片(90)和所述极芯(10)之间，以使所述负极引出片(90)与所述极芯(10)绝缘。
  12. 根据权利要求10或11所述的电池单元(100)，其特征在于，所述负极引出片(90)包括：
    第一片体(91)，所述第一片体(91)沿所述长轴方向延伸，且与所述负极耳连接；
    第二片体(92)，所述第二片体(92)沿所述短轴方向延伸，所述第二片体(92)分别与所述第一片体(91)、所述第三绝缘侧板(80)和所述负极柱连接。
  13. 根据权利要求1-12中任一项所述的电池单元(100)，其特征在于，多个所述连接部(111，121)沿延伸的所述长轴方向间隔开分布。
  14. 根据权利要求1-13中任一项所述的电池单元(100)，其特征在于，多个所述连接部(111，121)串联连接。
  15. 根据权利要求1-14中任一项所述的电池单元(100)，其特征在于，还包括：
    防爆阀盖板(50)，所述防爆阀盖板(50)设于所述短轴且和所述极柱盖板(40)位于所述长轴的两侧。
  16. 根据权利要求1-15中任一项所述的电池单元(100)，其特征在于，所述长轴的尺寸大于所述短轴的尺寸。
  17. 一种电池模组，其特征在于，包括权利要求1-16任一所述的电池单元(100)。
  18. 一种车辆，其特征在于，包括权利要求17所述的电池模组。
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CN211907618U (zh) * 2020-05-18 2020-11-10 联动天翼新能源有限公司 一种多极耳圆柱电池卷芯及锂离子电池
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CN113506955A (zh) * 2021-07-13 2021-10-15 珠海冠宇电池股份有限公司 电池外壳和电池
CN217387457U (zh) * 2021-12-21 2022-09-06 比亚迪股份有限公司 电池单元、电池模组和车辆
CN217387458U (zh) * 2021-12-21 2022-09-06 比亚迪股份有限公司 电池单元、电池模组和车辆

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