WO2023005005A1 - 一种二次电池、电池模组及用电装置 - Google Patents

一种二次电池、电池模组及用电装置 Download PDF

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Publication number
WO2023005005A1
WO2023005005A1 PCT/CN2021/124589 CN2021124589W WO2023005005A1 WO 2023005005 A1 WO2023005005 A1 WO 2023005005A1 CN 2021124589 W CN2021124589 W CN 2021124589W WO 2023005005 A1 WO2023005005 A1 WO 2023005005A1
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WO
WIPO (PCT)
Prior art keywords
pole
extension
top cover
secondary battery
tab
Prior art date
Application number
PCT/CN2021/124589
Other languages
English (en)
French (fr)
Inventor
李勇军
卢军太
陈圣立
Original Assignee
江苏正力新能电池技术有限公司
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.)
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Application filed by 江苏正力新能电池技术有限公司 filed Critical 江苏正力新能电池技术有限公司
Priority to DE112021005958.0T priority Critical patent/DE112021005958T5/de
Publication of WO2023005005A1 publication Critical patent/WO2023005005A1/zh

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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
    • H01M50/10—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
    • 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
    • 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
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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 belongs to the technical field of batteries, and in particular relates to a secondary battery, a battery module and an electrical device.
  • lithium batteries used in electric tools and electric vehicles are generally called power batteries.
  • the battery lug is welded to the pole through the adapter piece, which has been widely used in the top cover setting of the power battery.
  • the tabs of the battery cell are super-welded with the adapter piece first, and then placed on the bottom of the top cover pole for laser welding to realize the function of the battery cell.
  • this structure has high cost and many processes, and the adapter piece The thickness also increases the internal space of the cell.
  • One of the objectives of the present invention is to address the shortcomings of the prior art and provide a secondary battery that eliminates the need for an adapter plate, simplifies production parts and procedures, and helps reduce production costs.
  • a secondary battery comprising a top cover sheet, a cell assembly, and an insulator disposed between the top cover sheet and the cell assembly to isolate the cell assembly from the top cover sheet; at least one cell Assemblies, the cell assembly includes a cell body and tabs provided on the cell body; poles, the poles pass through the top cover sheet and the insulator and are connected to the tabs; The lower end of the pole extends along the lower surface of the insulator to form an extension, and the extension is fixedly connected to the tab.
  • the insulating member isolates the top cover sheet from the extension part, and the extension part extends along the width direction Y of the top cover sheet.
  • the extension part extends along the length direction X of the top cover sheet.
  • the insulator includes a high temperature resistant part, the high temperature resistant part is arranged above the extension part, and the high temperature resistant part is made of a high temperature resistant material.
  • the insulating member is integrally or separately provided with the high temperature resistant part.
  • a groove is provided at one end of the pole close to the cell assembly.
  • the lower surface of the high temperature resistant part at least covers the first soldering area.
  • the tab includes a first connecting portion and a first bending portion connected in sequence, and the first bending portion connects the cell body and the The first connection part is fixedly connected to the extension part.
  • the extension part and the tab are welded to form a first soldering area, and the area of the first soldering area and the lower part of the extension part
  • the area ratio of the surface is less than 0.95; the horizontal distance between the edge of the first soldering area and the edge of the extension part is 0.25mm-20mm; the lower surface of the extension part is processed by embossing process.
  • a secondary battery As an improvement of a secondary battery according to the present invention, it includes a protective member, the protective member includes a second connecting portion and a second bending portion connected in sequence, and the second connecting portion is fixed to the The lower surface of the first connecting part, the second bending part is bent along the inner surface of the first bending part, and the first connecting part and the second connecting part are welded to form a second welding area .
  • the protective member further includes a turning part, the turning part is connected to the second bending part, the second connecting part, the second bending part The part and the folded part form a U-shaped structure.
  • the top cover sheet is also provided with at least one of an explosion-proof valve hole and a liquid injection hole; ;
  • the pole includes a first pole and a second pole, the first pole, the tab electrically connected to the first pole, and the protection member are all aluminum materials, the first pole
  • the two poles, the tabs electrically connected to the second pole, and the protective member are all made of copper; in the length direction of the top cover sheet, the protective member of the copper material and the aluminum
  • One of the protective parts of the material is provided with a fool-proof part, and the thickness of the protective part is 0.1-3 mm.
  • At least two battery cell assemblies are arranged side by side along the width direction of the top cover sheet, and in the width direction Y of the top cover sheet, the poles
  • the first connecting parts of the tabs with the same polarity are welded to the lower surface of the extension part, and the first bending parts of the tabs with the same polarity are bent towards the center of the battery core assemblies arranged side by side.
  • the second object of the present invention is to provide a battery module including the above-mentioned secondary battery.
  • the third object of the present invention is to provide an electrical device including the above-mentioned secondary battery.
  • the present invention includes a top cover sheet, a cell assembly, and an insulating member arranged between the top cover sheet and the cell assembly to isolate the cell assembly from the top cover sheet; at least A cell assembly, the cell assembly includes a cell body and a tab provided on the cell body; a pole, the pole passes through the top cover sheet and the insulator and is connected to the pole Ear connection: the lower end of the pole extends along the lower surface of the insulating member to form an extension, and the extension is fixedly connected to the ear.
  • the cell lug is super-welded with the adapter piece first, and then placed on the bottom of the top cover pole for laser welding to realize the function of the cell, but this structure has high cost, many processes, and the transfer
  • the thickness of the sheet will also increase the internal space of the battery. Therefore, an extension is provided on the pole to fix the extension and the tab together, that is, the pole and the tab are electrically connected to realize the function of the battery.
  • the pole and the tab are directly fixed and connected, eliminating the need to install the adapter, simplifying the production process, and avoiding the space occupied by the adapter in the height direction of the battery, which helps to improve the space utilization rate inside the battery, thereby improving the battery life.
  • the lower end of the pole extends along the lower surface of the insulator to form an extension, which helps to increase the contact area between the tab and the extension, improves the overcurrent performance of the battery, and can also improve the performance of the tab and the extension.
  • the stability between the two tabs reduces the probability of open circuit between the tabs and the extension.
  • two tabs are formed on one side of the cell body, and the two tabs are respectively connected to the two poles of different polarities on the top cover sheet.
  • the fixed connection realizes the electrical connection between the pole and the cell body, and the insulator plays the role of isolating the top cover sheet and the extension part, reducing the probability of contact between the top cover sheet and the extension part, which helps to improve the safety of the battery .
  • the invention omits the connecting piece, simplifies the production parts and procedures, and helps to reduce the production cost.
  • FIG. 1 is a schematic structural diagram of Embodiment 1 of the present invention.
  • Fig. 2 is a schematic structural diagram of Embodiment 2 of the present invention.
  • FIG. 3 is a schematic structural diagram of Embodiment 3 of the present invention.
  • FIG. 4 is a schematic structural diagram of Embodiment 4 of the present invention.
  • Fig. 5 is a structural schematic diagram of a tab and a protective member in Embodiment 4 of the present invention after welding.
  • FIG. 6 is a schematic structural view of the fourth pole installed on the top cover sheet in Embodiment 4 of the present invention.
  • FIG. 7 is an enlarged view of A in FIG. 6 .
  • FIG. 8 is a schematic structural view of the second pole installed on the top cover sheet in Embodiment 4 of the present invention.
  • FIG. 9 is an enlarged view of B in FIG. 8 .
  • FIG. 10 is a schematic structural diagram of Embodiment 2 of the present invention and two battery cells assembled.
  • FIG. 11 is a schematic structural diagram of Embodiment 2 of the present invention and four battery cells assembled.
  • FIG. 12 is a schematic structural diagram of Embodiment 4 of the present invention and two battery cells assembled.
  • Fig. 13 is a schematic structural view of the fourth embodiment of the present invention and the assembly of four battery cells.
  • 6-protector 61-second connecting part; 62-second bending part; 63-turning part; 64-foolproof part;
  • connection In the invention, unless otherwise clearly specified and limited, the terms “installation”, “connection”, “connection”, “fixation” and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, Or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.
  • a secondary battery includes a top cover sheet 1, a cell assembly, and an insulating member 9 disposed between the top cover sheet 1 and the cell assembly to isolate the cell assembly and the top cover sheet 1; at least one cell assembly, cell
  • the assembly includes the cell body 3 and the tab 4 provided on the cell body 3; the pole 2, the pole 2 passes through the top cover sheet 1 and the insulator 9 and is connected to the tab 4; the lower end of the pole 2 is along the insulator
  • the lower surface of 9 is extended to form an extension part 20 , and the extension part 20 is fixedly connected with the tab 4 .
  • the cell lug is super-welded with the adapter piece first, and then placed on the bottom of the top cover pole for laser welding to realize the function of the cell, but this structure has high cost, many processes, and the transfer The thickness of the sheet will also increase the internal space of the cell. Therefore, an extension 20 is provided on the pole 2 to fix the extension 20 and the tab 4 together, that is, to electrically connect the pole 2 and the tab 4 to realize the function of the cell.
  • the pole 2 and the tab 4 are directly fixedly connected, which saves the installation of adapters, simplifies the production process, and avoids the space occupied by the adapter in the height direction of the battery, which helps to improve the internal space of the battery.
  • the lower end of the pole 2 extends along the lower surface of the insulator 9 to form an extension 20, which helps to increase the contact area between the tab 4 and the extension 20, and improves the battery life.
  • the tab 4 and the extension part 20 can also improve the stability between the tab 4 and the extension part 20, and reduce the probability of an open circuit between the tab 4 and the extension part 20, wherein two tabs 4 are formed on one side of the cell body 3,
  • the two tabs 4 are respectively fixedly connected to the two poles 2 with different polarities of the top cover 1 to realize the electrical connection between the pole 2 and the cell body 3, and the insulator 9 functions to isolate the top cover 1 and the extension part 20 reduce the probability of contact between the top cover sheet 1 and the extension part 20, which helps to improve the safety of the battery.
  • the fixing method between the extension part 20 and the tab 4 includes but not limited to welding, bonding, riveting or clamping, and ultrasonic welding is preferably used.
  • the extension part 20 and the tab 4 are welded to form a first solder footprint, and the ratio of the area of the first solder footprint to the area of the lower surface of the extension part 20 is less than 0.95.
  • the tab 4 is fixed to the extension part 20 by ultrasonic welding, and the extension part 20 of the tab 4 and the pole 2 is fixed together by forming the first welding footprint, and the area of the first welding footprint is smaller than the extension part 20.
  • the area of the part 20 can not only prevent the first soldering area from exceeding the extension part 20, causing damage to the top cover sheet 1 or other components, but also improve the stability between the tab 4 and the extension part 20, and reduce the welding process.
  • the tab 4 includes a first connecting portion 41 and a first bending portion 42 connected in sequence, the first bending portion 42 connects the cell body 3 and the first connecting portion 41, and the first connecting portion 41 and the first connecting portion 41
  • the extension part 20 is fixedly connected to realize the electrical connection between the tab 4 and the pole 2, and by setting the first bending part 42, the tab 4 has a smooth overall transition during assembly, reducing scratches or damage to the tab 4 The probability.
  • At least two cell assemblies are arranged side by side along the width direction Y of the top cover sheet 1, and in the width direction Y of the top cover sheet 1, the first connecting parts 41 of the tabs 4 with the same polarity are welded.
  • the first bending portions 42 of the tabs 4 with the same polarity are bent towards the center of the parallel cell assemblies.
  • the horizontal distance between the edge of the first solder land and the edge of the extension part is 0.25mm-20mm. Limit the distance between the edges of the two to prevent the distance between the edges from being too small, and part of the first soldering area may exceed the area of the extension part 20, resulting in damage to the top cover sheet 1 or other components, At the same time, the distance between the edges of the two is prevented from being too large, and the contact area of the edges of the tab 4 and the extension part 20 is too small, which affects the stability of the edges of the two.
  • the horizontal distance between the edge of the first soldering area and the edge of the extension part 20 can also be limited to 1mm-18mm. In some embodiments, the distance between the edge of the first soldering area and the edge of the extension part 20 The horizontal distance can also be 4mm, 7mm, 10mm, 13mm, 16mm.
  • the lower surface of the extension part 20 is subjected to an embossing process. Specifically, the surface of the extension part 20 corresponding to the tab 4 is embossed, which can improve the welding effect between the extension part 20 and the tab 4 and prevent slippage during welding.
  • solder marks 51 are uniformly provided in the first solder mark area; the shape of the solder marks 51 is square, circular or oval.
  • the first welding area is evenly distributed with welding marks 51, so that the stress on the tab 4 and the extension 20 is uniform, and at the same time, making full use of the space on the surface of the tab 4 helps to improve the distance between the tab 4 and the extension 20. stability.
  • the pole 2 is provided with a groove near the end of the cell assembly
  • the insulator 9 includes a high temperature resistant part
  • the high temperature resistant part 201 is arranged above the extension part 20, and the high temperature resistant part 201 consists of a high temperature resistant
  • the groove is arranged at the approximate center of the pole 2
  • the pole 2 includes a body part 23
  • the groove corresponds to the position of the body part 23
  • the extension part 20 is arranged around the edge of the body part 23
  • a high temperature resistant portion 201 is provided between the extension portion 20 and the top cover sheet 1, and the extension portion 20 is arranged around the edge of the main body portion 23, which can increase the area of the extension portion 20, that is, increase the contact area between the extension portion 20 and the tab 4, thus It helps to improve the flow performance between the two.
  • the extension part 20 can extend along the width direction Y of the top cover sheet 1, and the extension part 20 can also extend along the length direction X of the top cover sheet 1, which helps the extension part
  • the contact area between 20 and the tab 4 helps to improve the overall stability of the two.
  • the top of the extension 20 corresponds to the metal top cover sheet 1.
  • the temperature may be higher during welding, so in the extension 20 and the top cover sheet 1 are provided with a high-temperature resistant portion 201.
  • the extension portion 20 will melt through and pass through the insulation member 9, causing the extension portion 20 to conduct with the pole 2. , especially at the negative electrode, it will short-circuit the battery.
  • the cost of the high-temperature-resistant insulator 9 is relatively high, it is preferable to install the high-temperature-resistant insulator 20 at the corresponding part of the welding.
  • the insulator 9 and the high temperature resistant part 201 can be integrally arranged, which helps to improve the overall mechanical properties of the insulator 9 and simplifies the assembly process.
  • the insulator 9 and the The high temperature resistant part 201 can also be arranged separately.
  • the lower surface of the high temperature resistant portion 201 at least covers the first soldering area.
  • the working principle of the present invention is:
  • the pole 2 is provided with an extension 20, and the extension 20 and the pole 4 are fixed together, that is, the pole 2 and the pole 4 are electrically connected to realize the function of the battery cell. Compared with the existing structure, the pole 2 and the pole 4 are electrically connected.
  • the tabs 4 are directly fixed and connected, eliminating the need to install adapters, simplifying the production process, and avoiding the space occupied by the adapters in the height direction of the battery, which helps to improve the space utilization rate inside the battery, thereby increasing the energy density of the battery.
  • the lower end of the pole 2 extends along the lower surface of the insulator 9 to form an extension 20, which helps to increase the contact area between the tab 4 and the extension 20, improves the overcurrent performance of the battery, and also improves the contact between the tab 4 and the extension 20.
  • the stability between the extension parts 20 reduces the probability of breaking the tab 4 and the extension part 20, and the insulator 9 plays the role of isolating the top cover sheet and the extension part 20, reducing the probability of contact between the top cover sheet and the extension part 20 , help to improve the safety of the battery.
  • Embodiment 1 includes two battery core bodies 3, where the two tabs 4 of one battery core body 3 are fixedly connected to the extensions 20 of the two poles 2, and the other battery core body The two tabs 4 of 3 are also fixedly connected to the extensions 20 of the two poles 2 respectively.
  • the cell bodies 3 are arranged side by side, and the two tabs 4 with the same polarity are connected to the extension 20 of the same pole 2, and the extension 20 is arranged around the edge of the main body 23, so that the same extension 20 can connect two tabs 4 with the same polarity, that is to realize the parallel connection between two cell bodies 3, increase the number of cell bodies 3 in the battery, and help to increase the energy density of the battery.
  • four cell bodies 3 may also be included. Specifically, four cell assemblies are arranged side by side along the width direction Y of the top cover sheet 1, and the first bends of the tabs 4 with the same polarity The folded part 42 is bent towards the center of the parallel cell assemblies, and the first bent part 42 forms a structure similar to an arc or an L shape. Similarly, it can be extended to a plurality of cell bodies 3. For specific bending, refer to Fig. 10 and FIG.
  • the tabs 4 of multiple cell bodies 3 form a roughly symmetrical structure; when the number of cell bodies 3 is an odd number, the multiple cell bodies
  • the tab 4 of 3 has an asymmetric structure, and in the width direction Y, the bent shape of the tab 4 can be adjusted according to the structure of the actual battery.
  • this embodiment also includes a protective piece 6, the protective piece 6 includes a second connecting portion 61 and a second bending portion 62 connected in sequence, and the second connecting portion 61 is fixed to the first connecting portion by welding 41, the second bending portion 62 is bent along the inner surface of the first bending portion 42, the first connecting portion 41 and the second connecting portion 61 form a second welding footprint by welding, and the protection member 6 also includes The folded portion 63 , the folded portion 63 is connected to the second bent portion 62 , the second connecting portion 61 , the second bent portion 62 , and the folded portion 63 form a U-shaped structure.
  • the protection piece 6 is added to prevent the folded part of the tab 4 from being inserted into the cell body 3; to prevent the burrs generated by welding from passing through the tab 4 and even inserting into the cell body 3, in order to fix the protection piece 6
  • the protective member 6 and the tab 4 are fixedly connected by means of ultrasonic welding to form a second welding footprint, specifically, the lower surface of the first connecting portion 41 of the tab 4 and the protective member 6
  • the second connecting portion 61 of the second connecting portion 61 is fixedly connected by ultrasonic welding, and the first bending portion 42 of the tab 4 and the second bending portion 62 of the protective member 6 are fixedly connected by ultrasonic welding, which helps to increase the area of ultrasonic welding, thereby improving The stability between the tab 4 and the protective piece 6; in some embodiments, after the tab 4 and the protective sheet 6 are ultrasonically welded, the protective sheet 6, the tab 4 and the pole 2 are penetrated by laser welding, and the The protection sheet 6, the tab 4 and the pole 2 are connected together
  • adding the turning part 63 can prevent the tab 4 from being inserted upside down, and play the role of limiting the tab 4, wherein the first bending part 42 of the tab 4 and the first bending part 42 of the protective member 6
  • the second bent portion 62 can adopt a rounded structure, which helps to reduce the probability of scratching the tab 4, thereby improving the quality of the battery.
  • this embodiment includes two cell bodies 3 and four protective pieces 6, wherein the two tabs 4 of one cell body 3 are fixedly connected to the extensions 20 of the two poles 2 respectively. , the two tabs 4 of the other cell body 3 are also fixedly connected to the extensions 20 of the two poles 2 respectively, and the four protective parts 6 are fixed on the inner surfaces of the four tabs 4 respectively, and the top cover sheet 1 In the width direction Y of , two tabs 4 with the same polarity are oppositely welded to the bottom surface of the extension part 20 .
  • the cell bodies 3 are arranged side by side, and the two tabs 4 with the same polarity are connected to the extension 20 of the same pole 2, and the extension 20 is arranged around the edge of the body 23, so that the extension 20 can Connecting two tabs 4 with the same polarity realizes the parallel connection between two cell bodies 3, increases the number of cell bodies 3 in the battery, and helps to improve the energy density of the battery.
  • Four protective parts 6 It can prevent the burrs of the top cover sheet 1 from being inserted into the battery cell body 3, resulting in damage to the battery cell body 3, and also helps to prevent short circuits inside the battery, and also plays the role of separating the tabs 4 and the top cover sheet 1.
  • four cell bodies 3 may also be included. Specifically, four cell assemblies are arranged side by side along the width direction Y of the top cover sheet 1, and the first bends of the tabs 4 with the same polarity The folded part 42 is bent towards the center of the parallel cell assemblies, and the first bent part 42 forms a structure similar to an arc or an L shape. Similarly, it can be extended to a plurality of cell bodies 3. For specific bending, refer to Fig. 12 and Figure 13.
  • the top cover sheet 1 of this embodiment is also provided with at least one of an explosion-proof valve hole 11 and a liquid injection hole 12;
  • the pole 2 is sequentially set with a plastic part 7 and a sealing ring 8;
  • 2 includes a first pole 21 and a second pole 22, the first pole 21, the tab 4 electrically connected to the first pole 21, and the protection member 6 are all aluminum materials, the second pole 22, and the first pole 22
  • the pole lug 4 and the protective piece 6 electrically connected to the pole 21 are made of copper, and the thickness of the protective piece 6 is 0.1-3mm.
  • the protective piece 6 of copper material and the protective piece of aluminum material One of the pieces 6 is provided with a foolproof portion 64 .
  • the plastic part 7 is set on the pole 2, so that the pole 2 is fastened to the top cover sheet 1, which not only plays an insulating role between the top cover 1 and the pole 2, but also ensures that the top cover 1 and the pole 2 Airtightness between the poles 2; the extension part 20 of the pole 2 passes through the top cover sheet 1 and is fixed to the tab 4, which can improve the stability between the pole 2 and the tab 4, and prevent the tab 4 from falling off.
  • the sealing ring 8 is an assembly made of fluoroplastic injection molding or fluororubber die-cutting, which has good electrical insulation performance, high heat resistance, oil resistance, solvent resistance, and wear resistance resistance, moisture resistance and low temperature resistance, which help to prolong the service life of the sealing ring 8, thereby improving the safety performance of the battery cell, wherein the tab 4 can be welded together with the protective part 6, simplifying the production process, and avoiding the need for adapters Occupying the space in the height direction of the battery helps to improve the space utilization inside the battery, thereby increasing the energy density of the battery.
  • the injection hole 12 is convenient for injecting the electrolyte into the inside of the battery.
  • the top cover sheet 1 is equipped with an explosion-proof valve, and a protective film is installed on the top of the explosion-proof valve hole 11.
  • a protective film can prevent external impurities from entering the explosion-proof valve and affecting the function of the explosion-proof valve.
  • the protective part 6 adds a fool-proof part 64, specifically, in the length direction X of the top cover sheet 1, one of the protective part 6 of copper material and the protective part 6 of aluminum material is provided with a fool-proof part 64, which is specially used for Make a distinction on any one of the protective sheet 6 of the copper tab or the protective sheet 6 dedicated to the aluminum tab, that is, form the fool-proof part 64, which is convenient for machine or human eyes to identify, and helps to improve the quality of the battery;
  • the thickness of the protective member 6 prevents the thickness of the protective member 6 from being too large, which leads to an increase in production costs, and invades the space in the height direction of the top cover, which is not conducive to improving the space utilization rate inside the battery.
  • the thickness of the protective member 6 can also be limited to 1mm-3mm. In some embodiments, the thickness of the protective member 6 can also be 1.5mm, 2mm, 2.5mm.
  • the battery module of the present invention includes the secondary batteries of Embodiments 1-5.
  • the battery includes a casing and a top cover sheet 1 , and the casing includes a storage space surrounded by a plurality of walls and an opening formed on one side of the storage space.
  • the top cover sheet 1 is arranged at the opening to close the receiving space.
  • a pole 2 is arranged on the top cover sheet 1, and the pole 2 is used as an external conducting terminal of the battery for electrical connection with other components. There are two poles on the same battery, namely a positive pole and a negative pole.
  • the battery core body 3 can be a wound structure or a laminated structure.
  • the cell body 3 includes a positive pole piece, a negative pole piece and a separator.
  • the material of the isolation film may be PP or PE.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary Lithium or lithium manganate, etc.;
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, the material of the negative electrode current collector is copper, and the negative electrode active material can be carbon or silicon, etc. .
  • the tab 4 is used to electrically connect with the pole 2 to lead the electric energy of the electrode assembly to the outside of the battery.
  • the tab 4 is generally arranged on the positive pole piece and the negative pole piece in the cell body 3 , and the tab 4 generally includes a positive pole tab and a negative pole tab.
  • the tab 4 can be directly connected to the pole 2 , that is, the tab 4 is directly welded to the pole 2 .
  • the electrical device of the present invention includes the secondary batteries of Embodiments 1 to 5.
  • the electrical device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, electric impact drills, concrete vibrators and electric planers, etc., the present invention does not specifically limit the above-mentioned electric devices.

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Abstract

一种二次电池、电池模组及用电装置，该二次电池包括顶盖片(1)，电芯组件，以及设置在所述顶盖片(1)和电芯组件之间、隔离所述电芯组件与所述顶盖片(1)的绝缘件(9)；至少一个电芯组件，所述电芯组件包括电芯本体(3)及设在所述电芯本体(3)的极耳(4)；极柱(2)，所述极柱(2)穿过所述顶盖片(1)和所述绝缘件(9)并与所述极耳(4)连接；所述极柱(2)的下端沿所述绝缘件(9)的下表面延伸形成延伸部(20)，所述延伸部(20)和所述极耳(4)固定连接。省去了转接片，简化生产零件和工序，有助于降低生产成本。

Description

一种二次电池、电池模组及用电装置
本申请要求于2021年7月29日提交中国专利局、申请号为202110861110.7、发明名称为“一种二次电池、电池模组及用电装置”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
本发明属于电池的技术领域，具体涉及一种二次电池、电池模组及用电装置。
背景技术
随着现代社会的发展和人们环保意识的增强，越来越多的设备选择以锂电池作为电源，如手机、笔记本电脑、电动工具和电动汽车等等，这为锂电池的应用与发展提供了广阔的空间。其中，电动工具和电动汽车等所使用的锂电池一般称之为动力电池。电芯极耳通过转接片焊接于极柱，一直被广泛使用于动力电池顶盖设置中。
现有结构中，电芯极耳先和转接片超焊在一起，然后置于顶盖极柱的底部激光焊接，实现电芯功能，但此结构成本高，工序较多，而且转接片厚度还会增加电芯内部空间。
发明内容
本发明的目的之一在于：针对现有技术的不足，提供一种二次电池，省去了转接片，简化生产零件和工序，有助于降低生产成本。
为了实现上述目的，本发明采用如下技术方案：
一种二次电池，包括顶盖片，电芯组件，以及设置在所述顶盖片和电芯组件之间、隔离所述电芯组件与所述顶盖片的绝缘件；至少一个电芯组件，所述电芯组件包括电芯本体及设在所述电芯本体的极耳；极柱，所述极柱穿过所述顶盖片和所述绝缘件并与所述极耳连接；所述极柱的下端沿所述绝缘件的下表面延伸形成延伸部，所述延伸部和所述极耳固定连接。
作为本发明所述的一种二次电池的一种改进，所述绝缘件将所述顶盖片和所述延伸部隔离，所述延伸部沿所述顶盖片的宽度方向Y延伸。
作为本发明所述的一种二次电池的一种改进，所述延伸部沿所述顶盖片的长度方向X延伸。
作为本发明所述的一种二次电池的一种改进，所述绝缘件包括耐高温部，所述耐高温部设置在所述延伸部上方，所述耐高温部由耐高温材料制成。
作为本发明所述的一种二次电池的一种改进，所述绝缘件与所述耐高温部一体或分体设置。
作为本发明所述的一种二次电池的一种改进，所述极柱靠近所述电芯组件的一端设置有凹槽。
作为本发明所述的一种二次电池的一种改进，所述耐高温部的下表面至少覆盖第一焊印区。
作为本发明所述的一种二次电池的一种改进，所述极耳包括依次连接的第一连接部和第一弯折部，所述第一弯折部连接所述电芯本体和所述第一连接部，所述第一连接部与所述延伸部固定连接。
作为本发明所述的一种二次电池的一种改进，所述延伸部和所述极耳通过焊接形成第一焊印区，所述第一焊印区的面积和所述延伸部的下表面的面积之比小于0.95；所述第一焊印区的边缘与所述延伸部的边缘的水平距离为0.25mm-20mm；所述延伸部的下表面经过压花工艺处理。
作为本发明所述的一种二次电池的一种改进，包括保护件，所述保护件包括依次连接的第二连接部和第二弯折部，所述第二连接部通过焊接固定于所述第一连接部的下表面，所述第二弯折部沿着第一弯折部的内表面弯折，所述第一连接部和所述第二连接部通过焊接形成第二焊印区。
作为本发明所述的一种二次电池的一种改进，保护件还包括回折部，所述回折部连接于所述第二弯折部，所述第二连接部、所述第二弯折部、所述回折部形成U形结构。
作为本发明所述的一种二次电池的一种改进，所述顶盖片还设置有防爆阀孔和注液孔中的至少一种；所述极柱依次套设有塑胶件、密封圈；所 述极柱包括第一极柱和第二极柱，所述第一极柱、与所述第一极柱电连接的所述极耳、所述保护件均为铝材料，所述第二极柱、与所述第二极柱电连接的所述极耳、所述保护件均为铜材料；在所述顶盖片的长度方向上，所述铜材料的保护件和所述铝材料的保护件中的一个设置有防呆部，所述保护件的厚度为0.1-3mm。
作为本发明所述的一种二次电池的一种改进，至少两个所述电芯组件沿着所述顶盖片的宽度方向并排设置，在所述顶盖片的宽度方向Y上，极性相同的所述极耳的第一连接部焊接于所述延伸部的下表面，极性相同的所述极耳的第一弯折部向并排的所述电芯组件的中心弯折。
本发明的目的之二在于提供一种电池模组，包括上述的二次电池。
本发明的目的之三在于提供一种用电装置，包括上述的二次电池。
本发明的有益效果在于，本发明包括顶盖片，电芯组件，以及设置在所述顶盖片和电芯组件之间、隔离所述电芯组件与所述顶盖片的绝缘件；至少一个电芯组件，所述电芯组件包括电芯本体及设在所述电芯本体的极耳；极柱，所述极柱穿过所述顶盖片和所述绝缘件并与所述极耳连接；所述极柱的下端沿所述绝缘件的下表面延伸形成延伸部，所述延伸部和所述极耳固定连接。由于现有结构中，电芯极耳先和转接片超焊在一起，然后置于顶盖极柱的底部激光焊接，实现电芯功能，但此结构成本高，工序较多，而且转接片厚度还会增加电芯内部空间，因此，在极柱上设置延伸部，将延伸部和极耳固定在一起，即将极柱和极耳电连接，实现电芯功能，相比现有的结构，将极柱和极耳直接固定连接，省去了安装转接件，简化生产工序，且避免转接件占用电池高度方向的空间，有助于提高电池内部的空间利用率，从而提高电池的能量密度，同时，极柱的下端沿绝缘件的下表面延伸形成延伸部，有助于增加极耳和延伸部之间的接触面积，提高电池的过流性能，还能提高极耳和延伸部之间的稳固性，降低极耳和延伸部发生断路的概率，其中，电芯本体的一侧形成两个极耳，两个极耳分别与顶盖片的两个极性相异的极柱固定连接，实现极柱和电芯本体之间的电连接，绝缘件起到隔离顶盖片和延伸部的作用，降低顶盖片和延伸部发生接 触的概率，有助于提高电池的安全性。本发明省去了转接片，简化生产零件和工序，有助于降低生产成本。
附图说明
下面将参考附图来描述本发明示例性实施方式的特征、优点和技术效果。
图1为本发明中实施方式一的结构示意图。
图2为本发明中实施方式二的结构示意图。
图3为本发明中实施方式三的结构示意图。
图4为本发明中实施方式四的结构示意图。
图5为本发明中实施方式四的极耳和保护件焊接后的结构示意图。
图6为本发明中实施方式四的第一极柱安装在顶盖片后的结构示意图。
图7为图6的A处放大图。
图8为本发明中实施方式四的第二极柱安装在顶盖片后的结构示意图。
图9为图8的B处放大图。
图10为本发明的实施方式二和两个电芯组装后的结构示意图。
图11为本发明的实施方式二和四个电芯组装后的结构示意图。
图12为本发明的实施方式四和两个电芯组装后的结构示意图。
图13为本发明的实施方式四和四个电芯组装后的结构示意图。
其中，附图标记说明如下：
1-顶盖片；11-防爆阀孔；12-注液孔；
2-极柱；20-延伸部；21-第一极柱；22-第二极柱；23-本体部；201-耐高温部；
3-电芯本体；
4-极耳；41-第一连接部；42-第一弯折部；
51-焊印；
6-保护件；61-第二连接部；62-第二弯折部；63-回折部；64-防呆部；
7-塑胶件；8-密封圈；9-绝缘件；
X-长度方向；Y-宽度方向。
具体实施方式
如在说明书及权利要求当中使用了某些词汇来指称特定组件。本领域技术人员应可理解，硬件制造商可能会用不同名词来称呼同一个组件。本说明书及权利要求并不以名称的差异来作为区分组件的方式，而是以组件在功能上的差异来作为区分的准则。如在通篇说明书及权利要求当中所提及的“包含”为一开放式用语，故应解释成“包含但不限定于”。“大致”是指在可接受的误差范围内，本领域技术人员能够在一定误差范围内解决技术问题，基本达到技术效果。
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。
在发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
以下结合附图1～13对本发明作进一步详细说明，但不作为对本发明的限定。
实施方式一
二次电池，包括顶盖片1，电芯组件，以及设置在顶盖片1和电芯组件之间、隔离电芯组件与顶盖片1的绝缘件9；至少一个电芯组件，电芯组件包括电芯本体3及设在电芯本体3的极耳4；极柱2，极柱2穿过顶盖片1和绝缘件9并与极耳4连接；极柱2的下端沿绝缘件9的下表面延伸形成延伸部20，延伸部20和极耳4固定连接。
由于现有结构中，电芯极耳先和转接片超焊在一起，然后置于顶盖极柱的底部激光焊接，实现电芯功能，但此结构成本高，工序较多，而且转接片厚度还会增加电芯内部空间，因此，在极柱2上设置延伸部20，将延伸部20和极耳4固定在一起，即将极柱2和极耳4电连接，实现电芯功能，相比 现有的结构，将极柱2和极耳4直接固定连接，省去了安装转接件，简化生产工序，且避免转接件占用电池高度方向的空间，有助于提高电池内部的空间利用率，从而提高电池的能量密度，同时，极柱2的下端沿绝缘件9的下表面延伸形成延伸部20，有助于增加极耳4和延伸部20之间的接触面积，提高电池的过流性能，还能提高极耳4和延伸部20之间的稳固性，降低极耳4和延伸部20发生断路的概率，其中，电芯本体3的一侧形成两个极耳4，两个极耳4分别与顶盖片1的两个极性相异的极柱2固定连接，实现极柱2和电芯本体3之间的电连接，绝缘件9起到隔离顶盖片1和延伸部20的作用，降低顶盖片1和延伸部20发生接触的概率，有助于提高电池的安全性。
于本实施方式中，延伸部20和极耳4之间固定方式包括但不限于焊接、粘接、铆接或卡接，优选采用超声焊接。
在根据本发明的二次电池中，延伸部20和极耳4通过焊接形成第一焊印区，第一焊印区的面积和延伸部20的下表面的面积之比小于0.95。具体的，极耳4通过超声焊固定于延伸部20，通过形成第一焊印区，使得极耳4和极柱2的延伸部20固定在一起，而且，第一焊印区的面积小于延伸部20的面积，不仅避免第一焊印区超出延伸部20，导致顶盖片1或其他零部件受到损伤的情况，还能提高极耳4和延伸部20之间的稳固性，减少焊接过程中的焊渣产生，有助于提高电池的性能，同时，第一焊印区的面积稍小于延伸部20的面积，增加两者接触面积，有助于提高极耳4和极柱2之间的过流能力，从而提高电池的性能。在一些实施方式中，极耳4包括依次连接的第一连接部41和第一弯折部42，第一弯折部42连接电芯本体3和第一连接部41，第一连接部41与延伸部20固定连接，实现极耳4和极柱2之间的电连接，且通过设置第一弯折部42，使得极耳4在装配时，整体平滑过渡，降低刮蹭或损伤极耳4的概率。
于本实施方式中，至少两个电芯组件沿着顶盖片1的宽度方向Y并排设置，在顶盖片1的宽度方向Y上，极性相同的极耳4的第一连接部41焊接于延伸部20的下表面，极性相同的极耳4的第一弯折部42向并排的电芯组件的中心弯折。具体的，若干个电芯组件并排设置，多个极性相同的极耳4连接同一个极柱2的延伸部20，且延伸部20的下表面面积较大，使得延伸部20 可连接多个极性相同的极耳4，即实现多个电芯本体3之间的并联连接，通过增加电池内电芯电芯本体3的数量，有助于提高电池的能量密度。
在根据本发明的二次电池中第一焊印区的边缘与延伸部的边缘的水平距离为0.25mm-20mm。限定两者的边缘之间的距离，防止两者的边缘之间的距离过小，部分第一焊印区可能超出延伸部20的面积，导致顶盖片1或其他零部件受到损伤的情况，同时，防止两者的边缘之间的距离过大，极耳4和延伸部20的边缘接触面积过小，影响两者的边缘之间的稳固性。在一些实施方式中，第一焊印区的边缘与延伸部20的边缘的水平距离也可限定为1mm-18mm，在一些实施方式中，第一焊印区的边缘与延伸部20的边缘的水平距离也可为4mm、7mm、10mm、13mm、16mm。
在根据本发明的二次电池中，延伸部20的下表面经过压花工艺处理。具体的，延伸部20对应极耳4的表面经过压花处理，能够提高延伸部20与极耳4的焊接效果，防止在焊接时发生打滑的情况。
在根据本发明的二次电池中，第一焊印区均匀设有若干个焊印51；焊印51的形状为方形、圆形或椭圆形。第一焊印区均布有焊印51，使得极耳4和延伸部20的受力均匀，同时，充分利用极耳4表面的空间，有助于提高极耳4和延伸部20之间的稳固性。
在根据本发明的二次电池中，极柱2靠近电芯组件的一端设置有凹槽，绝缘件9包括耐高温部，耐高温部201设置在延伸部20上方，耐高温部201由耐高温材料制成，于本实施方式中，凹槽设置在极柱2大致中央的位置，极柱2包括本体部23，凹槽对应本体部23的位置，延伸部20环绕本体部23的边缘设置，延伸部20和顶盖片1之间设置有耐高温部201，延伸部20环绕本体部23的边缘设置，能够增加延伸部20的面积，即增加延伸部20和极耳4的接触面积，有助于提高两者间的过流性能，具体的，延伸部20可沿顶盖片1的宽度方向Y延伸，延伸部20也可沿顶盖片1的长度方向X延伸，有助于延伸部20和极耳4之间的接触面积，有助于提高两者整体的稳固性，在焊接时，延伸部20的上方对应金属的顶盖片1，焊接时温度可能较高，所以在延伸部20和顶盖片1之间设耐高温部201，具体的，若采用普通绝缘的绝缘件9，会导致延伸部20融穿，穿过绝缘件9，导致延伸部20与极柱2导通，特别是 在负极，会使得电池短路，此外，由于耐高温的绝缘件9成本比较高，优选在焊接对应部位设置耐高温绝缘件20，其余部分可以用普通绝缘件9，也可以全用耐高温绝缘件9。在一些实施方式中，绝缘件9与耐高温部201可采用一体设置，有助于提高绝缘件9整体的机械性能，简化装配工序，同时，也可根据实际生产需求和成本，绝缘件9与耐高温部201也可采用分体设置。在一些实施方式中，耐高温部201的下表面至少覆盖第一焊印区。
本发明的工作原理是：
在极柱2上设置延伸部20，将延伸部20和极耳4固定在一起，即将极柱2和极耳4电连接，实现电芯功能，相比现有的结构，将极柱2和极耳4直接固定连接，省去了安装转接件，简化生产工序，且避免转接件占用电池高度方向的空间，有助于提高电池内部的空间利用率，从而提高电池的能量密度，同时，极柱2的下端沿绝缘件9的下表面延伸形成延伸部20，有助于增加极耳4和延伸部20之间的接触面积，提高电池的过流性能，还能提高极耳4和延伸部20之间的稳固性，降低极耳4和延伸部20发生断路的概率，绝缘件9起到隔离顶盖片和延伸部20的作用，降低顶盖片和延伸部20发生接触的概率，有助于提高电池的安全性。
实施方式二
与实施方式一不同的是：本实施方式包括两个电芯本体3，其中一个电芯本体3的两个极耳4分别与两个极柱2的延伸部20固定连接，另一个电芯本体3的两个极耳4也分别与两个极柱2的延伸部20固定连接。于本实施方式中，电芯本体3并排设置，两个极性相同的极耳4连接同一个极柱2的延伸部20，且延伸部20环绕本体部23的边缘设置，使得同一个延伸部20可连接两个极性相同的极耳4，即实现两个电芯本体3之间的并联连接，增加电池内电芯电芯本体3的数量，有助于提高电池的能量密度。
此外，在一些实施方式中，还可以包括四个电芯本体3，具体的，四个电芯组件沿着顶盖片1的宽度方向Y并排设置，极性相同的极耳4的第一弯折部42向并排的电芯组件的中心弯折，第一弯折部42形成类似弧形或L形的结构，同理，可以扩展到多个电芯本体3，具体弯折，可参看图10和图11所示，当电芯本体3的数量为偶数时，多个电芯本体3的极耳4形成大致对称 的结构，当电芯本体3的数量为奇数时，多个电芯本体3的极耳4为非对称结构，在宽度方向Y上，极耳4的弯折的形状可以根据实际电池的结构进行调整。
其他结构与实施方式一相同，这里不再赘述。
实施方式三
与实施方式一不同的是：本实施方式还包括保护件6，保护件6包括依次连接的第二连接部61和第二弯折部62，第二连接部61通过焊接固定于第一连接部41的下表面，第二弯折部62沿着第一弯折部42的内表面弯折，第一连接部41和第二连接部61通过焊接形成第二焊印区，保护件6还包括回折部63，回折部63连接于第二弯折部62，第二连接部61、第二弯折部62、回折部63形成U形结构。于本实施方式中，增加保护件6，可以防止极耳4的翻折部分插入电芯本体3；防止焊接产生的毛刺穿过极耳4，甚至插入电芯本体3，为了将保护件6固定在极耳4的内表面，采用超声焊接的方式将保护件6和极耳4固定连接，形成第二焊印区，具体的，极耳4的第一连接部41的下表面和保护件6的第二连接部61通过超声焊固定连接，极耳4的第一弯折部42和保护件6的第二弯折部62通过超声焊固定连接，有助于增加超声焊的面积，从而提高极耳4和保护件6之间的稳固性；在一些的实施方式中，极耳4与保护片6超声焊后，再通过激光焊穿透保护片6、极耳4及极柱2，将保护片6、极耳4及极柱2连在一起，有助于提高保护片6、极耳4及极柱2之间的稳固性，还省去了对极耳4和极柱2进行超声焊的工序，增加回折部63，能够防止极耳4发生倒插的情况，起到对极耳4进行限位的作用，其中，极耳4的第一弯折部42和保护件6的第二弯折部62可以采用倒圆角的结构，有助于降低刮蹭极耳4的概率，从而提高电池的质量。
其他结构与实施方式一相同，这里不再赘述。
实施方式四
与实施方式三不同的是：本实施方式包括两个电芯本体3和四个保护件6，其中一个电芯本体3的两个极耳4分别与两个极柱2的延伸部20固定连接，另一个电芯本体3的两个极耳4也分别与两个极柱2的延伸部20固定连接，四个保护件6分别固定在四个极耳4的内表面，在顶盖片1的宽度方向Y上，两 个极性相同的极耳4相对焊接于延伸部20的底面。于本实施方式中，电芯本体3并排设置，两个极性相同的极耳4连接同一个极柱2的延伸部20，且延伸部20环绕本体部23的边缘设置，使得延伸部20可连接两个极性相同的极耳4，即实现两个电芯本体3之间的并联连接，增加电池内电芯电芯本体3的数量，有助于提高电池的能量密度，四个保护件6可以防止顶盖片1的毛刺插入电芯本体3，导致电芯本体3受损的情况，还有助于防止电池内部发生短路，也起到间隔极耳4和顶盖片1的作用。
此外，在一些实施方式中，还可以包括四个电芯本体3，具体的，四个电芯组件沿着顶盖片1的宽度方向Y并排设置，极性相同的极耳4的第一弯折部42向并排的电芯组件的中心弯折，第一弯折部42形成类似弧形或L形的结构，同理，可以扩展到多个电芯本体3，具体弯折，可参看图12和图13所示。
其他结构与实施方式三相同，这里不再赘述。
实施方式五
与实施方式三不同的是：本实施方式顶盖片1还设置有防爆阀孔11和注液孔12中的至少一种；极柱2依次套设有塑胶件7、密封圈8；极柱2包括第一极柱21和第二极柱22，第一极柱21、与第一极柱21电连接的极耳4、保护件6均为铝材料，第二极柱22、与第一极柱21电连接的极耳4、保护件6均为铜材料，保护件6的厚度为0.1-3mm，在顶盖片1的长度方向X上，铜材料的保护件6和铝材料的保护件6中的一个设置有防呆部64。具体的，将塑胶件7套在极柱2上，使极柱2紧固在顶盖片1，不仅起到顶盖片1和极柱2之间的绝缘作用，还能确保顶盖片1和极柱2之间的密闭性；极柱2的延伸部20穿过顶盖片1固定于极耳4，能够提高极柱2和极耳4之间的稳固性，避免极耳4脱落，有助于提高电池的安全性；密封圈8由氟塑胶注塑成型或氟橡胶模切成型，制成的装配件，具有良好电绝缘性能、高度的耐热性、耐油性、耐溶剂、耐磨性、耐湿性和耐低温性，有助于延长密封圈8的使用寿命，从而提高电芯安全性能，其中，极耳4能够与保护件6焊接在一起，简化生产工序，且避免转接件占用电池高度方向的空间，有助于提高电池内部的空间利用率，从而提高电池的能量密度。注液孔12便于将电解液注入到电池内部，顶盖 片1安装有防爆阀，防爆阀孔11顶部安装有保护膜，防爆阀能够在电池由于过充、过放、过流及电池内部短路导致电池内压上升时，使电池自动快速泄压，避免电池爆炸导致安全事故的发生，保护膜能够防止外界杂质进入到防爆阀内，影响防爆阀的功能。此外，保护件6增加防呆部64，具体的，在顶盖片1的长度方向X上，铜材料的保护件6和铝材料的保护件6中的一个设置有防呆部64，专用于铜极耳的保护片6或专用于铝极耳的保护片6中的任意一个上面做个区别出来，即形成防呆部64，方便机器或人眼识别，有助于提高电池的质量；限定保护件6的厚度，防止保护件6的厚度过大，导致生产成本上升，且侵占顶盖高度方向的空间，不利于提高电池内部的空间利用率，同时，防止保护件6的厚度过小，影响保护件6整体的机械强度，不利于延长电池的使用寿命在一些实施方式中，防止保护件6的厚度也可限定为1mm-3mm，在一些实施方式中，保护件6的厚度也可为1.5mm、2mm、2.5mm。
其他结构与实施方式三相同，这里不再赘述。
电池模组和用电装置
本发明的电池模组包括实施方式一～五的二次电池。
需要说明的是，电池包括壳体和顶盖片1，壳体包括多个壁围设形成的收容空间以及形成于收容空间一侧的开口。顶盖片1布置在开口处以封闭收容空间。顶盖片1上设置有极柱2，极柱2作为电池的外导通端，其用于与其他部件电性连接。同一电池上具有两个极柱，也即一个正极柱和一个负极柱。
电芯本体3可以是卷绕式的结构，也可以是叠片式的结构。电芯本体3包括正极极片、负极极片和隔离膜。具体地，隔离膜的材质可以为PP或PE等。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等；负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面，负极集流体的材料为铜，负极活性物质可以为碳或硅等。
极耳4用于与极柱2电连接以将电极组件的电能引出到电池外部。极耳4 一般会设置在电芯本体3中的正极极片和负极极片上，极耳4一般包括正极极耳和负极极耳。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量也为多个且层叠在一起。可以理解的，极耳4可以直接与极柱2连接，即极耳4直接与极柱2焊接在一起。
本发明的用电装置包括实施方式一～五的二次电池。
需要说明的是，该用电装置可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等；航天器包括飞机、火箭、航天飞机和宇宙飞船等等；电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等，本发明对上述用电装置不做特殊限制。
根据上述说明书的揭示和教导，本发明所属领域的技术人员还能够对上述实施方式进行变更和修改。因此，本发明并不局限于上述的具体实施方式，凡是本领域技术人员在本发明的基础上所作出的任何显而易见的改进、替换或变型均属于本发明的保护范围。此外，尽管本说明书中使用了一些特定的术语，但这些术语只是为了方便说明，并不对本发明构成任何限制。

Claims (14)

  1. 一种二次电池，其特征在于，包括：
    顶盖片(1),电芯组件，以及设置在所述顶盖片(1)和电芯组件之间、隔离所述电芯组件与所述顶盖片(1)的绝缘件(9)；
    至少一个电芯组件，所述电芯组件包括电芯本体(3)及设在所述电芯本体(3)的极耳(4)；极柱(2)，所述极柱(2)穿过所述顶盖片(1)和所述绝缘件(9)并与所述极耳(4)连接；
    其特征在于：所述极柱(2)的下端沿所述绝缘件(9)的下表面延伸形成延伸部(20)，所述延伸部(20)和所述极耳(4)固定连接。
  2. 如权利要求1所述的二次电池，其特征在于：所述绝缘件(9)将所述顶盖片和所述延伸部(20)隔离，所述延伸部(20)沿所述顶盖片(1)的宽度方向(Y)延伸。
  3. 如权利要求2所述的二次电池，其特征在于：所述延伸部(20)沿所述顶盖片(1)的长度方向(X)延伸。
  4. 如权利要求1所述的二次电池，其特征在于：所述绝缘件(9)包括耐高温部，所述耐高温部(201)设置在所述延伸部(20)上方，所述耐高温部(201)由耐高温材料制成。
  5. 如权利要求1所述的二次电池，其特征在于：所述极柱(2)靠近所述电芯组件的一端设置有凹槽。
  6. 如权利要求4所述的二次电池，其特征在于：所述极耳(4)包括依次连接的第一连接部(41)和第一弯折部(42)，所述第一弯折部(42)连接所述电芯本体(3)和所述第一连接部(41)，所述第一连接部(41)与所述延伸部(20)固定连接。
  7. 如权利要求6所述的二次电池，其特征在于：所述延伸部(20)和所述极耳(4)通过焊接形成第一焊印区，所述第一焊印区的面积和所述延伸部(20)的下表面的面积之比小于0.95；所述第一焊印区的边缘与所述延伸部的边缘的水平距离为0.25mm-20mm；所述延伸部(20)的下表面经过压花工艺处理。
  8. 如权利要求7所述的二次电池，其特征在于：包括保护件(6)，所述保护件(6)包括依次连接的第二连接部(61)和第二弯折部(62)，所述第二连接部(61)通过焊接固定于所述第一连接部(41)的下表面，所述第二弯折部(62)沿着第一弯折部(42)的内表面弯折，所述第一连接部(41)和所述第二连接部(61)通过焊接形成第二焊印区。
  9. 如权利要求8所述的二次电池，其特征在于：保护件(6)还包括回折部(63)，所述回折部(63)连接于所述第二弯折部(62)，所述第二连接部(61)、所述第二弯折部(62)、所述回折部(63)形成U形结构。
  10. 如权利要求8所述的二次电池，其特征在于：所述耐高温部(201)的下表面至少覆盖所述第一焊印区。
  11. 如权利要求8所述的一种二次电池，其特征在于：所述顶盖片(1)还设置有防爆阀孔(11)和注液孔(12)中的至少一种；
    所述极柱(2)依次套设有塑胶件(7)、密封圈(8)；所述极柱(2)包括第一极柱(21)和第二极柱(22)，所述第一极柱(21)、与所述第一极柱(21)电连接的所述极耳(4)、所述保护件(6)均为铝材料，所述第二极柱(22)、与所述第二极柱(22)电连接的所述极耳(4)、所述保护件(6)均为铜材料；
    在所述顶盖片(1)的长度方向(X)上，所述铜材料的保护件(6)和所述铝材料的保护件(6)中的一个设置有防呆部(64),所述保护件(6)的厚度为0.1-3mm。
  12. 如权利要求10所述的一种二次电池，其特征在于：至少两个所述电芯组件沿着所述顶盖片(1)的宽度方向(Y)并排设置，在所述顶盖片(1)的宽度方向(Y)上，极性相同的所述极耳(4)的第一连接部(41)焊接于所述延伸部(20)的下表面，极性相同的所述极耳(4)的第一弯折部(42)向并排的所述电芯组件的中心弯折。
  13. 一种电池模组，其特征在于：包括权利要求1-12任意一项所述的二次电池。
  14. 一种用电装置，其特征在于：包括权利要求1-12任意一项所述的二次电池。
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