WO2020238531A1 - 二次电池 - Google Patents

二次电池 Download PDF

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Publication number
WO2020238531A1
WO2020238531A1 PCT/CN2020/087437 CN2020087437W WO2020238531A1 WO 2020238531 A1 WO2020238531 A1 WO 2020238531A1 CN 2020087437 W CN2020087437 W CN 2020087437W WO 2020238531 A1 WO2020238531 A1 WO 2020238531A1
Authority
WO
WIPO (PCT)
Prior art keywords
secondary battery
positioning
top cover
sub
compression
Prior art date
Application number
PCT/CN2020/087437
Other languages
English (en)
French (fr)
Inventor
雷育永
邢承友
王鹏
杨剑雄
白璐璐
蔡其昌
Original Assignee
宁德时代新能源科技股份有限公司
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 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to EP20813339.7A priority Critical patent/EP3933960B1/en
Publication of WO2020238531A1 publication Critical patent/WO2020238531A1/zh
Priority to US17/535,676 priority patent/US20220085445A1/en

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Classifications

    • 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
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • 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
    • H01M50/50—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
    • 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
    • H01M50/564—Terminals characterised by their manufacturing process
    • 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
    • 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
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • 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

  • This application relates to the technical field of energy storage equipment, and in particular to a secondary battery.
  • the battery module usually includes a top cover assembly and an electrode unit, and the poles of the battery module and the tabs of the electrode unit are connected by connecting pieces. Constrained by manufacturing, in the manufacturing process of the battery module, the tabs need to meet a certain length, after the tabs are connected to the adapter sheet, the pole and the like. The longer tab will be folded into a certain space through the folding process. This will reduce the safety performance of the battery module.
  • the embodiment of the present application provides a secondary battery, which aims to ensure that the electrode unit is not inserted into the electrode unit during the ear folding process, which causes the electrode unit to short circuit.
  • a secondary battery including: an electrode unit, including an electrode main body and tabs extending from the electrode main body, the tabs including a first part and a second part spaced apart along the height direction of the secondary battery Two parts; the top cover assembly is arranged on the side of the electrode body facing the tabs, the top cover assembly includes a top cover body and a pressing beam, the top cover body is provided with positioning protrusions on the first surface facing the electrode unit, positioning protrusions The upper part is provided with a positioning chute, and the compression beam is located between the first subsection and the second subsection, and is detachably arranged in the positioning chute of at least two positioning protrusions.
  • the top cover main body is an insulating top cover plate
  • the top cover body includes a top cover plate and an insulating plate stacked in a height direction, and the first surface is arranged on a side of the insulating plate away from the top cover plate.
  • two or more positioning protrusions are distributed at intervals along the length direction of the secondary battery, and the second sub-section is located between two adjacent positioning protrusions.
  • the positioning chute is formed by recessing the positioning protrusion toward the inner surface of the second sub-part.
  • the positioning chute penetrates the positioning protrusion along the length direction.
  • the three positioning protrusions are arranged at intervals along the length direction, and the second parts of the two tabs are respectively arranged between two adjacent positioning protrusions.
  • the compression beam includes two sub-compression beams successively distributed along the length direction, and the two sub-compression beams are respectively located between the first and second parts of the two lugs;
  • the two sub-compression beams are integrally formed structures, or the two sub-compression beams are separately arranged.
  • the extension heights of the two sub-compression beams in the height direction are different to accommodate the second sub-sections of different thicknesses on the electrode unit.
  • one of the positioning protrusions and the compression beam is provided with a hook, and the other is provided with a groove that cooperates with the hook, so that the compression beam passes through the hook and the groove It is buckled in the positioning chute.
  • the compression beam includes a connecting end located in the positioning chute, and the connecting end includes a first outer surface, a second outer surface, and a bottom surface opposite to each other in the height direction of the secondary battery.
  • the top surface, the first outer surface is located on the side of the second outer surface close to the middle of the main body of the top cover, and the first outer surface is protrudingly formed with a hook;
  • the positioning protrusion is recessed toward the inner wall surface of the positioning sliding groove to form a clamping groove.
  • the top surface is recessed with a relief space, and a weakened portion is provided in the relief space, and the weakened portion is formed by recessing the inner surface forming the relief space toward the first surface.
  • more than two positioning sliding grooves are provided on the positioning protrusion, and the two or more positioning sliding grooves are spaced apart along the thickness direction of the secondary battery, and there are more than two compression beams.
  • the compression beams are arranged side by side along the thickness direction;
  • the positioning protrusion is extended and formed in the thickness direction, or the positioning protrusion includes two or more sub-protrusions sequentially distributed along the thickness direction, and positioning sliding grooves are respectively provided on the two sub-protrusions.
  • Another embodiment of the present application further provides a battery pack including the above-mentioned secondary battery.
  • Another embodiment of the present application further provides a vehicle including the above-mentioned secondary battery.
  • the secondary battery includes a top cover assembly and an electrode unit arranged at intervals, and the tabs are located between the electrode body and the top cover assembly, and the top cover body is provided with positioning protrusions on the side facing the tabs.
  • the upper part is provided with a positioning chute, the compression beam is detachably arranged in the positioning chute, and the compression beam is located between the first branch and the second branch.
  • the second subsection can be confined between the compression beam and the first surface by the compression beam, so that the tabs are folded along the compression beam during the folding process, preventing the tabs from being redundantly inserted into the electrode unit, that is, preventing the second The segment is bent toward the first segment to cause a short circuit of the electrode unit, which can effectively improve the safety performance of the secondary battery.
  • FIG. 1 is a schematic diagram of an exploded structure of a secondary battery according to an embodiment of the present application
  • FIG. 2 is a cross-sectional view of a secondary battery according to an embodiment of the present application.
  • Figure 3 is a partial enlarged schematic view of the structure of Figure 2;
  • FIG. 4 is a schematic structural diagram of a top cover main body of a secondary battery according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a top cover main body of a secondary battery according to another embodiment of the present application.
  • Figure 6 is a partial enlarged schematic view of the structure of Figure 5;
  • FIG. 7 is a schematic structural diagram of a compression beam of a secondary battery according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a compression beam of a secondary battery according to another embodiment of the present application.
  • FIG. 9 is a side view of a compression beam of a secondary battery according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of an assembly process of a secondary battery according to an embodiment of the present application.
  • Electrode body
  • the tabs need to meet a certain length, after the tabs are connected with the adapter plates, the poles and the like. Longer tabs will be folded into a certain space through the folding process. In actual production, the folded shape of the tabs is uncontrollable. The tabs will not be bent according to the ideal route designed. Some tabs will be bent, piled up or directly inserted into the electrode unit, causing the electrode unit to short circuit.
  • FIG. 1 is a schematic structural diagram of a secondary battery provided by an embodiment of this application
  • FIG. 2 is a cross-sectional view
  • FIG. 3 is a partial enlarged structural diagram of FIG. 2
  • FIG. 4 is an implementation of this application
  • the secondary battery includes: an electrode unit 30, including an electrode main body 32 and tabs 31 extending from the electrode main body 32.
  • the tabs 31 include first subsections spaced apart along the height direction of the secondary battery (the Z direction in FIG.
  • the top cover assembly 10 is disposed on the side of the electrode body 32 facing the tab 31, the top cover assembly 10 includes a top cover body 100 and a compression beam 200, the top cover body 100 faces the electrode unit 30
  • a positioning protrusion 120 is provided on the first surface 110, and a positioning sliding groove 121 is opened on the positioning protrusion 120.
  • the compression beam 200 is located between the first subsection 31a and the second subsection 31b, and is detachably disposed at least In the positioning sliding groove 121 of the two positioning protrusions 120.
  • the secondary battery includes a top cover assembly 10 and an electrode unit 30 arranged at intervals, and the tab 31 is located between the electrode main body 32 and the top cover assembly 10.
  • the top cover body 100 is provided with a positioning protrusion 120 on the side facing the tab 31.
  • the positioning protrusion 120 is provided with a positioning slide groove 121.
  • the compression beam 200 is detachably disposed in the positioning slide groove 121, and the compression beam 200 is located Between the first subsection 31a and the second subsection 31b.
  • the second subsection 31b can be confined between the compression beam 200 and the first surface 110 by the compression beam 200, so that the tab 31 is folded along the compression beam 200 during the folding process, preventing the tab 31 from being redundantly inserted into the electrode In the unit 30, the second sub-part 31b is prevented from being bent toward the first sub-part 31a and the electrode unit 30 is short-circuited to ensure the safety performance of the secondary battery.
  • the number of positioning protrusions 120 is more than two, and the two or more positioning protrusions 120 are along the length direction of the secondary battery (the Y direction in FIG. 1) Distributed at intervals, the second sub-section 31b is located between two adjacent positioning protrusions 120. Both sides of the second division 31b can be supported by the positioning protrusions 120, and the two positioning protrusions 120 can provide a space for the second division 31b to prevent the second division 31b from being compressed and deformed.
  • the compression beam 200 is arranged in the positioning sliding groove 121 of the two positioning protrusions 120, which can ensure the stability of the relative position between the compression beam 200 and the top cover main body 100.
  • the secondary battery further includes a casing 20, the casing 20 has a containing cavity and an opening communicating with the containing cavity, the electrode unit 30 is located in the containing cavity, and the tab 31 is disposed facing the opening;
  • the assembly 10 is covered at the opening, and more complete protection is provided to the electrode unit 30 through the top cover assembly 10 and the housing 20.
  • the top cover body 100 is an insulating top cover plate; or in other alternative embodiments, the top cover body 100 includes stacks along the height direction.
  • the top cover plate 100a and the insulating plate 100b are provided.
  • the top cover plate 100a is located on the side of the insulating plate 100b away from the electrode unit 30, and the first surface 110 is located on the side of the insulating plate 100b away from the top cover plate 100a.
  • the arrangement of the top cover body 100 is not limited to this, as long as it is ensured that the first surface 110 of the top cover body 100 facing the electrode unit 30 is an insulating surface to prevent the tab 31 and the top cover body 100 from being electrically connected to cause a short circuit, and improve the secondary battery Safety performance.
  • the number of electrode units 30 is not limited here. As shown in FIG. 1, there are two electrode units 30, and the two electrode units 30 are stacked along the thickness direction of the secondary battery (the X direction in FIG. 1). The tabs 31 of the electrode unit 30 are distributed at intervals in the thickness direction.
  • one positioning protrusion 120 is provided with two positioning sliding grooves 121, the two positioning sliding grooves 121 are spaced apart along the thickness direction, there are two compression beams 200, and two compression beams 200 Distributed at intervals along the thickness direction, the two pressing beams 200 are respectively located between the second part 31 b and the first part 31 a of the upper tab 31 of the two electrode units 30.
  • the number of electrode units 30 is not limited to this.
  • the number of electrode units 30 can also be three or more, and three or more electrode units 30 are stacked in the thickness direction.
  • the number of the positioning sliding grooves 121 on the positioning protrusion 120 is not limited to this, the positioning sliding grooves 121 may be three or more, and the compression beam 200 may also be three or more. As long as the compression beam 200 can be located between the first part 31a and the second part 31b of the upper tab 31 of the electrode unit 30, to prevent the second part 31b from bending towards the first part 31a and causing the electrode unit 30 to short-circuit. .
  • positioning protrusion 120 When there are more than two positioning sliding grooves 121 provided on the positioning protrusion 120, there are many ways to arrange the positioning protrusion 120, for example, the positioning protrusion 120 is extended in the thickness direction, and one positioning protrusion 120 is provided with two The above positioning sliding groove 121 or positioning protrusion 120 includes two or more sub-protrusions 122 sequentially distributed along the thickness direction, and positioning sliding grooves 121 are respectively provided on the two or more sub-protrusions 122.
  • the three positioning protrusions 120 include two integrated positioning protrusions 120 provided on both sides of the first surface 110 along the length direction, and two integrated positioning protrusions 120
  • the two sub-protrusions 122 between the positioning protrusions 120 are arranged at intervals in the thickness direction, which can reduce the space occupied by the positioning protrusions 120, and make it easier for the installation of components such as explosion-proof valves on the top cover assembly 10 Bit.
  • the positioning slide groove 121 can be formed by recessing the positioning protrusion 120 toward the inner surface 123 of the lug 31, or the positioning slide groove 121 can penetrate and position along the length direction.
  • the protrusion 120 is provided.
  • the positioning sliding groove 121 provided on the positioning protrusion 120 on both sides of the first surface 110 is formed by recessing the inner side surface 123 thereof, that is, the positioning sliding groove 121 does not penetrate the positioning protrusion 120.
  • the positioning chute 121 and the positioning protrusion 120 can provide a limit to the compression beam 200, and the compression beam 200 is squeezed between the two positioning protrusions 120 on both sides.
  • the positioning sliding groove 121 on the sub-protrusion 122 located in the middle of the first surface 110 is penetrated to facilitate the quick installation of the compression beam 200.
  • the tabs 31 are located on the same electrode unit 30.
  • the two tabs 31 of the electrode unit 30 are located on the same side of the electrode body 32, and the same compression beam 200 is located on the electrode unit 30 between the two tabs 31. Between the first subsection 31a and the second subsection 31b.
  • the two tabs 31 of the electrode unit 30 are separately provided on both sides of the electrode body 32, and the two compression beams 200 are respectively located between the first part 31a and the second part 31b of the two tabs 31.
  • the two tabs 31 of the electrode unit 30 are located on the same side of the electrode body 32, and the positioning protrusions 120 are three , The three positioning protrusions 120 are arranged at intervals along the length direction, the second subsections 31b of the two tabs 31 are respectively located between two adjacent positioning protrusions 120, and the compression beam 200 is detachably arranged at the three positioning The positioning chute 121 of the protrusion 120, and the compression beam 200 are respectively located between the second part 31b and the first part 31a of the two tabs 31, preventing the second part 31b of the two tabs 31 from facing The direction of the first segment 31a is deformed.
  • the compression beam 200 includes two sub-compression beams 210 successively distributed along the length direction.
  • the compression beams 210 are respectively located between the first part 31a and the second part 31b of the two tabs 31; wherein, the two sub-compression beams 210 are integrally formed structures, or the two sub-compression beams 210 are separately arranged .
  • the positive and negative tabs 31 of the electrode unit 30 are located on one side of the electrode body 32, and the same compression beam 200 is located at the first part 31a of the positive tab 31 and the negative tab 31 at the same time. Between the second sub-sections 31b, the compression beam 200 is divided into two sub-compression beams 210, which facilitates the provision of two sub-compression beams 210 for the two tabs 31 respectively.
  • the structure of the two sub-compression beams 210 may be the same or inconsistent.
  • the extension heights of the two sub-compression beams 210 in the height direction are different to accommodate the second sub-sections 31b of different thicknesses on the electrode unit 30. .
  • the positive and negative lugs 31 are made of different materials, which may cause the thickness of the positive and negative lugs 31 to be different. Therefore, the thickness of the second part 31b of the two lugs 31 may be different.
  • the extension height of the tension beam 210 in the height direction is different, which can be adapted to the second sub-sections 31b of different thicknesses on the electrode unit 30, ensuring that the second sub-sections 31b of the two tabs 31 and the two sub-compression beams 210 are tightly matched, respectively.
  • the stability of the relative position between each second part 31b and the first surface 110 and the sub-compression beam 210 is provided.
  • any of the above embodiments there are many ways to detachably connect the compression beam 200 and the positioning protrusion 120, such as interference fit between the compression beam 200 and the positioning chute 121, so that when the compression beam 200 is located in the positioning chute 121 When inside 121, the stability of the relative position between the compression beam 200 and the positioning protrusion 120 is ensured.
  • one of the positioning protrusion 120 and the pressing beam 200 is provided with a hook 224, and the other is provided with a groove 125 that cooperates with the hook 224, so as to press
  • the tightening beam 200 is buckled in the positioning sliding groove 121 through the hook 224 and the groove 125.
  • the positioning protrusion 120 and the compression beam 200 are snap-connected to improve the stability of the relative position between the positioning protrusion 120 and the compression beam 200.
  • the compression beam 200 includes a connecting end 220 located in the positioning chute 121, and the connecting end 220 includes a first outer surface 221, a second outer surface 222 opposite in the thickness direction, and The bottom surface 223 and the top surface 225 are opposed to each other, the first outer surface 221 is located on the side of the second outer surface 222 close to the middle of the top cover body 100, the first outer surface 221 is protrudingly formed with a hook 224; the positioning protrusion 120 faces The inner wall surface 124 of the positioning sliding groove 121 is recessed and formed with a clamping groove 125.
  • the structure of the compression beam 200 is usually small, and if the compression beam 200 continues to be slotted, the strength of the compression beam 200 will be reduced.
  • the extension distance of the positioning sliding groove 121 on the positioning protrusion 120 is very limited, and there is sufficient space on the positioning protrusion 120 to continue slotting.
  • the hook 224 is provided in the compression beam 200
  • the locking groove 125 is provided in the positioning chute 121, which can ensure the snap connection between the compression beam 200 and the positioning protrusion 120 while ensuring the strength of the compression beam 200 The stability.
  • the hook 224 on the compression beam 200 is formed by protruding from the first outer surface 221.
  • the first outer surface 221 is arranged close to the middle of the top cover main body 100. During the process of the compression beam 200 and the tab 31 mating with each other, An outer surface 221 and the tab 31 will not contact, so the hook 224 on the compression beam 200 will not scratch the tab 31.
  • the tab 31 further includes a folded portion 31c connected between the first subsection 31a and the second subsection 31b.
  • the compression beam 200 and the folded portion 31c are arranged side by side in the thickness direction, and the On the beam 200, the second outer surface 222 and the bottom surface 223 are smoothly connected, and the top surface 225 and the second outer surface 222 are smoothly connected.
  • the outer surfaces of the compression beam 200 and the folding portion 31c contact each other smoothly, so as to prevent the compression beam 200 from scratching the folding portion 31c and ensure the strength of the tab 31.
  • the top surface 225 is recessed to form a relief space 226, the relief space 226 is provided with a weakened portion 227, and the weakened portion 227 faces the first surface from the inner surface forming the relief space 226 110 recessed formation.
  • the connecting end 220 is also provided with a weakened portion 227.
  • the weakened portion 227 can improve the deformability of the connecting end 220 and facilitate compression.
  • the tightening beam 200 and the positioning protrusion 120 are connected to each other.
  • the top cover body 100 is further provided with a through hole for accommodating the poles of the secondary battery, and the secondary battery further includes a through hole located between the second subsection 31b and the first surface 110 Adapter piece 40.
  • the pole is arranged in the through hole, the adapter piece 40 is connected to the pole, and the second part 31b is connected to the adapter piece 40, so that the second part 31b is connected to the pole through the adapter piece 40 to connect the electrode body 32
  • the electric energy flows to the pole through the tab 31 and the adapter plate 40.
  • the tab 31 is led out on the electrode body 32.
  • the first part 31a is attached to the surface of the electrode body 32, that is, the first part 31a is connected between the electrode body 32 and the second part 31b, and the second part Both 31b and the folded portion 31c have a predetermined angle with the surface of the electrode body 32.
  • both the second subsection 31b and the folded portion 31c are at ninety degrees with the surface of the electrode body 32.
  • the adapter plate 40 is disposed on the first surface 110 of the cover main body 100.
  • the two electrode units 30 are respectively arranged on both sides of the top cover assembly 10, and the second sub-parts 31b of the two tabs 31 and the adapter sheet 40 on the top cover assembly 10 are arranged in a fit manner.
  • the second sub-part 31b and the adapter plate 40 are connected by laser welding and other techniques.
  • the compression beam 200 is assembled in the positioning slide groove 121, and the hook 224 on the compression beam 200 and the snap groove 125 in the positioning slide groove 121 are snap-connected to each other.
  • the weakened portion 227 improves the deformability of the pressing beam 200, so that the connecting end 220 can slide along the sliding groove, so that the groove 125 and the hook 224 cooperate with each other.
  • the tab 31 is bent so that the second sub-section 31b and the first sub-section 31a are spaced along the height direction.

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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)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本申请实施例提供一种二次电池，二次电池包括：电极单元，包括电极主体及由电极主体伸出的极耳，极耳包括沿二次电池高度方向间隔设置的第一分部和第二分部；顶盖组件，设置于电极主体朝向极耳的一侧，顶盖组件包括顶盖主体和压紧梁，顶盖主体朝向电极单元的第一表面上设置有定位凸起，定位凸起上设有定位滑槽，压紧梁位于第一分部和第二分部之间，并可拆卸地设置于定位滑槽内。本申请能够有效提高二次电池的安全性能。

Description

二次电池
相关申请的交叉引用
本申请要求享有于2019年05月29日提交的名称为“二次电池”的中国专利申请第201920795571.7号的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及储能设备技术领域，尤其涉及一种二次电池。
背景技术
电池模组通常包括顶盖组件和电极单元，电池模组的极柱和电极单元的极耳通过连接片连接。受制造的约束，在电池模组的制造过程中，极耳需要满足一定的长度，在完成极耳与转接片、极柱等的连接后。较长的极耳会通过折耳工序将其折进一定的空间内。这样会降低电池模组的安全性能。
因此，亟需一种新的二次电池。
申请内容
本申请实施例提供一种二次电池，旨在保证极耳在折耳工序中不会插入电极单元导致电极单元短路。
本申请实施例一方面提供了一种二次电池，包括：电极单元，包括电极主体及由电极主体伸出的极耳，极耳包括沿二次电池高度方向间隔设置的第一分部和第二分部；顶盖组件，设置于电极主体朝向极耳的一侧，顶盖组件包括顶盖主体和压紧梁，顶盖主体朝向电极单元的第一表面上设置有定位凸起，定位凸起上开设有定位滑槽，压紧梁位于第一分部和第二分部之间，并可拆卸地设置于至少两个定位凸起的定位滑槽内。
根据本申请的一个方面，顶盖主体为绝缘顶盖板；
或者，顶盖主体包括沿高度方向层叠设置的顶盖板和绝缘板，第一表面设置于绝缘板远离顶盖板的一侧。
根据本申请的一个方面，两个以上的定位凸起沿二次电池长度方向间隔分布，第二分部位于相邻的两个定位凸起之间。
根据本申请的一个方面，定位滑槽由定位凸起朝向第二分部的内侧面凹陷形成。
根据本申请的一个方面，定位滑槽沿长度方向贯穿定位凸起。
根据本申请的一个方面，定位凸起为三个，三个定位凸起沿长度方向间隔设置，两个极耳的第二分部分别设置于相邻的两个定位凸起之间。
根据本申请的一个方面，压紧梁包括沿长度方向相继分布的两个子压紧梁，两个子压紧梁分别位于两个极耳的第一分部和第二分部之间；
其中，两个子压紧梁为一体成型结构体，或者两个子压紧梁分体设置。
根据本申请的一个方面，两个子压紧梁沿高度方向的延伸高度不同，以适应电极单元上不同厚度的第二分部。
根据本申请的一个方面，定位凸起和压紧梁中，一者上设置有卡钩，另一者上设置有与卡钩相互配合的卡槽，以使压紧梁通过卡钩和卡槽卡扣于定位滑槽内。
根据本申请的一个方面，压紧梁包括位于定位滑槽内的连接端，连接端包括在二次电池厚度方向上相对的第一外表面、第二外表面及在高度方向上相对设置的底面和顶面，第一外表面位于第二外表面靠近顶盖主体中部的一侧，第一外表面凸出形成有卡钩，；
定位凸起朝向定位滑槽的内壁面凹陷形成有卡槽。
根据本申请的一个方面，顶面凹陷形成有让位空间，让位空间内设置有弱化部，弱化部由形成让位空间的内表面朝向第一表面凹陷形成。
根据本申请的一个方面，定位凸起上设置有两个以上的定位滑槽，两个以上的定位滑槽沿二次电池的厚度方向间隔分布，压紧梁为两个以上，两个以上的压紧梁沿厚度方向并列设置；
其中，定位凸起沿厚度方向延伸成型，或者，定位凸起包括沿厚度方向依次分布的两个以上子凸起，两个子凸起上分别设置有定位滑槽。
本申请另一实施例还提供一种电池组，包括上述的二次电池。
本申请又一实施例还提供一种车辆，包括上述的二次电池。
在本申请中，二次电池包括间隔设置的顶盖组件和电极单元，且极耳位于电极主体和顶盖组件之间，顶盖主体朝向极耳的一侧设置有定位凸起，定位凸起上开设有定位滑槽，压紧梁可拆卸地设置于定位滑槽，且压紧梁位于第一分部和第二分部之间。通过压紧梁能够将第二分部限位于压紧梁和第一表面之间，使极耳在折叠过程中沿着压紧梁折叠，防止极耳冗余插入电极单元中，即防止第二分部朝向第一分部弯折而导致电极单元短路，能够有效提高二次电池的安全性能。
附图说明
通过阅读以下参照附图对非限制性实施例所作的详细描述，本申请的其它特征、目的和优点将会变得更明显，其中，相同或相似的附图标记表示相同或相似的特征。
图1是本申请实施例的一种二次电池的爆炸结构示意图；
图2是本申请实施例的一种二次电池的剖视图；
图3是图2的局部放大结构示意图；
图4是本申请实施例的一种二次电池的顶盖主体的结构示意图；
图5是本申请另一实施例的一种二次电池的顶盖主体的结构示意图；
图6是图5的局部放大结构示意图；
图7是本申请实施例的一种二次电池的压紧梁的结构示意图；
图8是本申请另一实施例的一种二次电池的压紧梁的结构示意图；
图9是本申请实施例的一种二次电池的压紧梁的侧视图；
图10是本申请实施例的一种二次电池的装配过程示意图。
附图标记说明：
10、顶盖组件；
100、顶盖主体；100a、顶盖板；100b、绝缘板；
110、第一表面；120、定位凸起；121、定位滑槽；122、子凸起；123、内侧面；124、内壁面；125、卡槽；
200、压紧梁；
210、子压紧梁；
220、连接端；221、第一外表面；222、第二外表面；223、底面；224、卡钩；225、顶面；226、让位空间；227、弱化部；
20、壳体；
30、电极单元；
31、极耳；31a、第一分部；31b、第二分部；31c、折叠部；
32、电极主体；
40、转接片。
具体实施方式
下面将详细描述本申请的各个方面的特征和示例性实施例。在下面的详细描述中，提出了许多具体细节，以便提供对本申请的全面理解。但是，对于本领域技术人员来说很明显的是，本申请可以在不需要这些具体细节中的一些细节的情况下实施。下面对实施例的描述仅仅是为了通过示出本申请的示例来提供对本申请的更好的理解。在附图和下面的描述中，至少部分的公知结构和技术没有被示出，以便避免对本申请造成不必要的模糊；并且，为了清晰，可能夸大了部分结构的尺寸。此外，下文中所描述的特征、结构或特性可以以任何合适的方式结合在一个或更多实施例中。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，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申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的实施例的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另 有明确的规定和限定，术语“安装”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
现有技术中，在电池模组的制造过程中，极耳需要满足一定的长度，在完成极耳与转接片、极柱等的连接后。较长的极耳会通过折耳工序将其折进一定的空间内。在实际生产中，极耳折叠的形状是不可控制的，极耳并不会按照设计的理想路线进行弯折，部分极耳会弯折、堆积或者直接插入电极单元中导致电极单元短路。
为了解决极耳在折耳工序中会插入电极单元导致电极单元短路的问题，提出本申请。
为了更好地理解本申请，下面结合图1至图10对本申请实施例的二次电池进行详细描述。
请一并参阅图1至图4，图1为本申请实施例提供的一种二次电池的结构示意图，图2为剖视图，图3为图2的局部放大结构示意图，图4是本申请实施例的一种二次电池的顶盖主体的结构示意图。二次电池包括：电极单元30，包括电极主体32及由电极主体32伸出的极耳31，极耳31包括沿二次电池高度方向(图1中的Z方向)间隔设置的第一分部31a和第二分部31b；顶盖组件10，设置于电极主体32朝向极耳31的一侧，顶盖组件10包括顶盖主体100和压紧梁200，顶盖主体100朝向电极单元30的第一表面110上设置有定位凸起120，定位凸起120上开设有定位滑槽121，压紧梁200位于第一分部31a和第二分部31b之间，并可拆卸地设置于至少两个定位凸起120的定位滑槽121内。
在本申请中，二次电池包括间隔设置的顶盖组件10和电极单元30，且极耳31位于电极主体32和顶盖组件10之间。顶盖主体100朝向极耳31的一侧设置有定位凸起120，定位凸起120上开设有定位滑槽121，压紧梁200可拆卸地设置于定位滑槽121，且压紧梁200位于第一分部31a和第二分部31b之间。通过压紧梁200能够将第二分部31b限位于压紧梁200和第一表面110之间，使极耳31在折叠过程中沿着压紧梁200折叠，防止极耳31冗余插入电极单元30中，即防止第二分部31b朝向第一分部 31a弯折而导致电极单元30短路，保证二次电池的安全性能。
请一并参阅图5，在一些可选的实施例中，定位凸起120的个数为两个以上，两个以上的定位凸起120沿二次电池长度方向(图1中的Y方向)间隔分布，第二分部31b位于相邻的两个定位凸起120之间。使得第二分部31b的两侧都能够被定位凸起120支撑，两个定位凸起120能够向第二分部31b提供让位空间，防止第二分部31b被挤压变形。同时，压紧梁200设置于两个定位凸起120的定位滑槽121内，能够保证压紧梁200和顶盖主体100之间相对位置的稳定性。
在一些可选的实施例中，二次电池还包括壳体20，壳体20具有容纳腔和与容纳腔连通的开口，电极单元30位于容纳腔内，且极耳31朝向开口设置；顶盖组件10盖设于开口处，通过顶盖组件10和壳体20向电极单元30提供更完善的保护。
顶盖主体100的设置方式有多种，在一些可选的实施例中，顶盖主体100为绝缘顶盖板；或者在另一些可选的实施例中，顶盖主体100包括沿高度方向层叠设置的顶盖板100a和绝缘板100b，顶盖板100a位于绝缘板100b远离电极单元30的一侧，第一表面110设置于绝缘板100b远离顶盖板100a的一侧。顶盖主体100的设置方式不仅限于此，只要保证顶盖主体100朝向电极单元30的第一表面110为绝缘表面，防止极耳31和顶盖主体100发生电连接导致短路，提高二次电池的安全性能。
电极单元30的个数在此不做限定，如图1所示，电极单元30为两个，两个电极单元30沿二次电池的厚度方向(图1中的X方向)层叠设置，两个电极单元30的极耳31沿厚度方向间隔分布。
在这些可选的实施例中，一个定位凸起120上设置有两个定位滑槽121，两个定位滑槽121沿厚度方向间隔分布，压紧梁200为两个，两个压紧梁200沿厚度方向间隔分布，两个压紧梁200分别位于两个电极单元30上极耳31的第二分部31b和第一分部31a之间。
可以理解的是，电极单元30的个数不仅限于此，例如电极单元30还可以为三个以上，三个以上的电极单元30沿厚度方向层叠设置。定位凸起120上定位滑槽121的个数不仅限于此，定位滑槽121可以为三个以 上，压紧梁200也可以为三个以上。只要压紧梁200能够位于电极单元30上极耳31的第一分部31a和第二分部31b之间，防止第二分部31b朝向第一分部31a弯折导致电极单元30短路即可。
当定位凸起120上设置有两个以上的定位滑槽121时，定位凸起120的设置方式有多种，例如定位凸起120沿厚度方向延伸成型，一个定位凸起120上设置有两个以上的定位滑槽121，或者定位凸起120包括沿厚度方向依次分布的两个以上子凸起122，两个以上的子凸起122上分别设置有定位滑槽121。
请一继续参阅图5，定位凸起120为三个，三个定位凸起120包括设置于第一表面110沿长度方向两侧边的两个一体式定位凸起120、以及设置于两个一体式定位凸起120之间的两个子凸起122，两个子凸起122沿厚度方向间隔设置，能够减小定位凸起120的占据空间，为顶盖组件10上防爆阀等零部件的设置让位。
请一并参阅图6，定位滑槽121的设置方式有多种，例如定位滑槽121可以由定位凸起120朝向极耳31的内侧面123凹陷形成，或者定位滑槽121沿长度方向贯穿定位凸起120设置。
请继续参阅图5，设置于第一表面110两侧边的定位凸起120上的定位滑槽121由其内侧面123凹陷形成，即定位滑槽121没有贯穿定位凸起120设置。通过定位滑槽121及定位凸起120能够向压紧梁200提供限位，将压紧梁200挤压在两侧边的两个定位凸起120之间。位于第一表面110中间的子凸起122上的定位滑槽121贯穿设置，便于压紧梁200的快速安装。
同一个电极单元30上极耳31的设置方式有多种，例如电极单元30两个极耳31位于电极主体32的同一侧，同一个压紧梁200位于电极单元30上两个极耳31的第一分部31a和第二分部31b之间。或者电极单元30的两个极耳31分设于电极主体32的两侧，则两个压紧梁200分别位于两个极耳31的第一分部31a和第二分部31b之间。
在一些可选的实施例中，为了节省压紧梁200的个数，简化二次电池的结构，电极单元30的两个极耳31位于电极主体32的同一侧，定位凸起 120为三个，三个定位凸起120沿长度方向间隔设置，两个极耳31的第二分部31b分别位于相邻的两个定位凸起120之间，压紧梁200可拆卸地设置于三个定位凸起120的定位滑槽121，且压紧梁200分别位于两个极耳31的第二分部31b和第一分部31a之间，防止两个极耳31的第二分部31b沿朝向第一分部31a的方向变形。
请一并参阅图7至图9，压紧梁200的设置方式有多种，在一些可选的实施例中，压紧梁200包括沿长度方向相继分布的两个子压紧梁210，两个子压紧梁210分别位于两个极耳31的第一分部31a和第二分部31b之间；其中，两个子压紧梁210为一体成型结构体，或者两个子压紧梁210分体设置。
在这些可选的实施例中，电极单元30的正负两个极耳31位于电极主体32的一侧，同一个压紧梁200同时位于正极耳31和负极耳31的第一分部31a和第二分部31b之间，则压紧梁200分设为两个子压紧梁210，便于针对两个极耳31分别设置两个子压紧梁210。
两个子压紧梁210的结构可以一致或不一致，在一些可选的实施例中，两个子压紧梁210沿高度方向的延伸高度不同，以适应电极单元30上不同厚度的第二分部31b。
在同一个电极单元30中，正负极耳31的制造材料不同，有可能导致正负极耳31的厚度不同，因此两个极耳31的第二分部31b的厚度可能不同，两个子压紧梁210沿高度方向的延伸高度不同，能够适应电极单元30上不同厚度的第二分部31b，保证两个极耳31的第二分部31b分别和两个子压紧梁210紧密配合，保证每个第二分部31b和第一表面110及子压紧梁210之间相对位置的稳定性。
在上述任一实施例中，压紧梁200和定位凸起120可拆卸连接的方式有多种，例如压紧梁200和定位滑槽121过盈配合，从而当压紧梁200位于定位滑槽121内时保证压紧梁200和定位凸起120之间相对位置的稳定性。
在另一些可选的实施例中，定位凸起120和压紧梁200中，一者上设置有卡钩224，另一者上设置有与卡钩224相互配合的卡槽125，以使压 紧梁200通过卡钩224和卡槽125卡扣于定位滑槽121内。定位凸起120和压紧梁200卡扣连接，提高定位凸起120和压紧梁200之间相对位置的稳定性。
在一些可选的实施例中，压紧梁200包括位于定位滑槽121内的连接端220，连接端220包括在厚度方向上相对的第一外表面221、第二外表面222及在高度方向上相对设置的底面223和顶面225，第一外表面221位于第二外表面222靠近顶盖主体100中部的一侧，第一外表面221凸出形成有卡钩224；定位凸起120朝向定位滑槽121的内壁面124凹陷形成有卡槽125。
压紧梁200的结构通常较小，如果在压紧梁200上继续开槽会降低压紧梁200的强度。而定位滑槽121在定位凸起120上的延伸距离十分有限，定位凸起120上有充足的空间继续开槽。本实施例中卡钩224设置于压紧梁200，卡槽125设置于定位滑槽121，能够在保证压紧梁200强度的情况下保证压紧梁200和定位凸起120之间卡扣连接的稳定性。
此外，压紧梁200上的卡钩224由第一外表面221凸出形成，第一外表面221靠近顶盖主体100的中部设置，在压紧梁200和极耳31相互配合的过程中第一外表面221和极耳31不会接触，因此压紧梁200上的卡钩224不会划伤极耳31。
在一些可选的实施例中，极耳31还包括连接于第一分部31a和第二分部31b之间的折叠部31c，压紧梁200和折叠部31c沿厚度方向并排设置，压紧梁200上第二外表面222和底面223圆滑过渡连接，顶面225和第二外表面222圆滑过渡连接。令压紧梁200和折叠部31c相互接触的外表面圆滑过渡，防止压紧梁200划伤折叠部31c，保证极耳31的强度。
进一步的，在一些可选的实施例中，顶面225凹陷形成有让位空间226，让位空间226内设置有弱化部227，弱化部227由形成让位空间226的内表面朝向第一表面110凹陷形成。
在这些可选的实施例中，连接端220上还设置有弱化部227，当压紧梁200卡设入定位滑槽121内时，通过弱化部227可以提高连接端220的变形能力，便于压紧梁200和定位凸起120的相互连接。
进一步的，在一些可选的实施例中，顶盖主体100上还设置有用于容纳二次电池极柱的通孔，二次电池还包括位于第二分部31b和第一表面110之间的转接片40。极柱设置于通孔，转接片40连接于极柱，第二分部31b连接于转接片40，以使第二分部31b通过转接片40连接于极柱，将电极主体32内的电能通过极耳31、转接片40流向极柱。
请一并参阅图10，简述二次电池的制造过程：
在电极主体32上引出极耳31，此时第一分部31a贴合于电极主体32的表面，即第一分部31a连接于电极主体32与第二分部31b之间，第二分部31b和折叠部31c两者与电极主体32的表面呈预设角度。在一些可选的实施例中，第二分部31b和折叠部31c两者与电极主体32的表面呈九十度。
将转接片40设置于盖顶盖主体100的第一表面110。
将两个电极单元30分别设置于顶盖组件10的两侧，且两个极耳31的第二分部31b和顶盖组件10上的转接片40贴合设置。利用激光焊接等技术连接第二分部31b和转接片40。
如图9所示，将压紧梁200装配于定位滑槽121内，并令压紧梁200上的卡钩224和定位滑槽121内的卡槽125相互卡扣连接。在装配压紧梁200的过程中，由于弱化部227提高了压紧梁200的变形能力，使得连接端220能够沿着滑槽滑动，使得卡槽125和卡钩224相互配合。
弯折极耳31，令第二分部31b和第一分部31a沿高度方向间隔设置。
本申请可以以其他的具体形式实现，而不脱离其精神和本质特征。例如，特定实施例中所描述的算法可以被修改，而系统体系结构并不脱离本申请的基本精神。因此，当前的实施例在所有方面都被看作是示例性的而非限定性的，本申请的范围由所附权利要求而非上述描述定义，并且，落入权利要求的含义和等同物的范围内的全部改变从而都被包括在本申请的范围之中。

Claims (14)

  1. 一种二次电池，包括：
    电极单元，包括电极主体及由所述电极主体伸出的极耳，所述极耳包括沿所述二次电池高度方向间隔设置的第一分部和第二分部；
    顶盖组件，设置于所述电极主体朝向所述极耳的一侧，所述顶盖组件包括顶盖主体和压紧梁，所述顶盖主体朝向所述电极单元的第一表面上设置有定位凸起，所述定位凸起上设有定位滑槽，所述压紧梁位于所述第一分部和所述第二分部之间、并可拆卸地设置于所述定位滑槽内。
  2. 根据权利要求1所述的二次电池，其中，
    所述顶盖主体为绝缘顶盖板；
    或者，所述顶盖主体包括沿所述高度方向层叠设置的顶盖板和绝缘板，所述第一表面设置于所述绝缘板远离所述顶盖板的一侧。
  3. 根据权利要求1或2所述的二次电池，其特征在于，所述定位凸起为两个以上，两个以上的所述定位凸起沿所述二次电池长度方向间隔分布，所述第二分部位于相邻的两个所述定位凸起之间。
  4. 根据权利要求1-3任一项所述的二次电池，其中，所述定位滑槽由所述定位凸起朝向所述第二分部的内侧面凹陷形成。
  5. 根据权利要求1-4任一项所述的二次电池，其中，所述定位滑槽沿所述长度方向贯穿所述定位凸起。
  6. 根据权利要求1-5任一项所述的二次电池，其中，所述定位凸起为三个，三个所述定位凸起沿所述长度方向间隔设置，两个所述极耳的所述第二分部分别设置于相邻的两个所述定位凸起之间。
  7. 根据权利要求6所述的二次电池，其中，
    所述压紧梁包括沿所述长度方向相继分布的两个子压紧梁，两个所述子压紧梁分别位于两个所述极耳的所述第一分部和所述第二分部之间；
    其中，两个所述子压紧梁为一体成型结构体，或者两个所述子压紧梁分体设置。
  8. 根据权利要求7所述的二次电池，其中，两个所述子压紧梁沿所述 高度方向的延伸高度不同，以适应所述电极单元上不同厚度的所述第二分部。
  9. 根据权利要求1-8任一项所述的二次电池，其中，所述定位凸起和所述压紧梁中，一者上设置有卡钩，另一者上设置有与所述卡钩相互配合的卡槽，以使所述压紧梁通过所述卡钩和所述卡槽卡扣于所述定位滑槽内。
  10. 根据权利要求9所述的二次电池，其中，
    所述压紧梁包括位于所述定位滑槽内的连接端，所述连接端包括在所述二次电池厚度方向上相对的第一外表面、第二外表面及在所述高度方向上相对设置的底面和顶面，所述第一外表面位于所述第二外表面靠近所述顶盖主体中部的一侧，所述第一外表面凸出形成有卡钩；
    所述定位凸起朝向所述定位滑槽的内壁面凹陷形成有卡槽。
  11. 根据权利要求10所述的二次电池，其中，所述顶面凹陷形成有让位空间，所述让位空间内设置有弱化部，所述弱化部由形成所述让位空间的内表面朝向所述第一表面凹陷形成。
  12. 根据权利要求1-11任一项所述的二次电池，其中，
    所述定位凸起上设置有两个以上的定位滑槽，两个以上的所述定位滑槽沿所述二次电池的厚度方向间隔分布，所述压紧梁为两个以上，两个以上的所述压紧梁沿所述厚度方向并列设置；
    其中，所述定位凸起沿所述厚度方向延伸成型，或者，所述定位凸起包括沿所述厚度方向依次分布的两个以上子凸起，两个所述子凸起上分别设置有所述定位滑槽。
  13. 一种电池组，包括权利要求1-12任一项所述的二次电池。
  14. 一种车辆，包括权利要求1-12任一项所述的二次电池。
PCT/CN2020/087437 2019-05-29 2020-04-28 二次电池 WO2020238531A1 (zh)

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