WO2020103014A1 - 智能电池及其锂电芯 - Google Patents

智能电池及其锂电芯

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Publication number
WO2020103014A1
WO2020103014A1 PCT/CN2018/116634 CN2018116634W WO2020103014A1 WO 2020103014 A1 WO2020103014 A1 WO 2020103014A1 CN 2018116634 W CN2018116634 W CN 2018116634W WO 2020103014 A1 WO2020103014 A1 WO 2020103014A1
Authority
WO
WIPO (PCT)
Prior art keywords
tab
lithium battery
battery cell
welding
cell according
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2018/116634
Other languages
English (en)
French (fr)
Inventor
时文平
刘东任
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Mali Energy Technology Co Ltd
Original Assignee
Shenzhen Mali Energy Technology Co Ltd
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 Shenzhen Mali Energy Technology Co Ltd filed Critical Shenzhen Mali Energy Technology Co Ltd
Priority to CN201880099025.8A priority Critical patent/CN112913076A/zh
Priority to PCT/CN2018/116634 priority patent/WO2020103014A1/zh
Publication of WO2020103014A1 publication Critical patent/WO2020103014A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the invention relates to an intelligent battery and its lithium battery core, which belong to the field of batteries.
  • Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution.
  • a battery composed of cells assembled by winding is called a wound lithium battery, and is also called a winding core in the industry.
  • the wound lithium battery includes a wound electrode assembly and an aluminum-plastic film wrapped around the wound electrode assembly to seal it.
  • the wound electrode assembly is mainly composed of a positive electrode sheet and a separator It is formed by stacking and winding with the negative electrode sheet.
  • At least two connecting tabs are provided at the first end of the wound electrode assembly, one of the connecting tabs is connected to the positive tab, and the other connecting tab is connected to the negative tab.
  • the aluminum-plastic film of the wound lithium battery has a risk of being punctured by the connecting tab or other parts in the wound electrode assembly, which may affect the safety of the lithium battery.
  • embodiments of the present invention provide a smart battery and its lithium battery cell.
  • a lithium battery core includes: a wound electrode assembly, which is mainly formed by stacking and winding a positive electrode sheet, a separator, and a negative electrode sheet; At least two connecting tabs are provided at the first end of the wound electrode assembly, one connecting tab is connected to the positive electrode tab, and the other connecting tab is connected to the negative electrode tab; The wound electrode assembly, and sealing the wound electrode assembly; wherein, the second end of the wound electrode assembly is covered with an electrode protective glue, and the at least two connecting tabs are wound from the wound After the first end of the electrode assembly is extended, it is bent multiple times to form a plurality of bent portions, and one of the bent portions at least partially overlaps the electrode protection paste in the thickness direction.
  • a lithium battery core includes: a wound electrode assembly, which is mainly formed by stacking and winding a positive electrode sheet, a separator, and a negative electrode sheet; The first end of the wound electrode assembly is also provided with at least two connecting tabs, one connecting tab is connected to the positive electrode tab, and the other connecting tab is connected to the negative electrode tab; the aluminum-plastic film is coated The wound electrode assembly, and sealing the wound electrode assembly; a transfer tab, one end of which is inserted into the cavity formed by the aluminum-plastic film, and the other end is exposed outside the aluminum-plastic film.
  • the adapter tab is used for electrical connection with the connecting tab; wherein the connecting tab includes a welding section away from the positive and negative plates, and the connecting tab faces the surface of the aluminum-plastic film and The welding section is welded, and the outer surfaces of the welding marks of the connecting tab and the connecting pole are covered with a welding mark protective glue.
  • a smart battery including: a housing provided with an accommodating portion; the above-mentioned lithium battery, the lithium battery core is installed in the accommodating portion; and a battery control board installed in the accommodating portion The battery is electrically connected to the lithium battery cell; wherein the lithium battery cell is charged and discharged through the battery control board, and the battery control board is used to control the discharge or charging of the lithium battery cell.
  • the electrode sealant is provided on the second end of the wound electrode assembly, or the outer surface of the welding mark welded on the welding section of the connecting tab and the connecting tab is covered with the welding sealant , Can reduce the risk of puncturing the aluminum plastic film, thereby improving the safety of lithium batteries.
  • FIG. 1 is a side view of a lithium battery cell provided by an embodiment of the present invention.
  • FIGS 2 to 5 are schematic diagrams of the manufacturing process of the lithium battery core provided by the embodiment of the present invention.
  • 10-wound electrode assembly 10a-first end; 10b-second end; 101-positive electrode; 103-negative electrode; 105-separator; 30-aluminum plastic film; 50-connecting lug; 501-welding section 503-connecting section; 601-electrode protection glue; 603-welding sealant; 605-pole protection glue; 70-transferring ear; 701-welding part; 801-welding mark.
  • FIG. 1 is a side view of a lithium battery cell provided by an embodiment of the present invention.
  • the lithium battery provided in this embodiment includes: a wound electrode assembly 10 and an aluminum-plastic film 30 covering and sealing the wound electrode assembly 10.
  • the wound electrode assembly 10 is mainly formed by stacking the positive electrode sheet 101, the separator 105, and the negative electrode sheet 103, and then winding them.
  • the positive electrode sheet 101, the separator 105, and the negative electrode sheet 103 that are stacked together may be wound by any suitable winding method such as a Z shape, an S shape, or a zigzag shape.
  • the wound electrode assembly 10 includes a plurality of positive electrode sheets 101 and a plurality of negative electrode sheets 103. Therefore, when manufacturing the wound electrode assembly 10, the positive electrode sheet 101, the separator 105, and the negative electrode sheet 103 may be alternately stacked and wound.
  • At least two connecting tabs 50 are provided at the first end 10a of the wound electrode assembly 10, one of the connecting tabs 50 is connected to the positive electrode sheet 101 (eg, welding), and the other connecting tab 50 is connected to the negative electrode sheet 103 ( For example welding).
  • FIG. 1 shows that the first end 10 a of the wound electrode assembly 10 wound in a zigzag winding manner is provided with a negative electrode tab connected to the negative electrode sheet 103 and a connecting electrode connected to the positive electrode sheet 101 Ear 50 (not shown in FIG. 1).
  • the wound electrode assembly 10 includes a plurality of positive electrode sheets 101 and a plurality of negative electrode sheets 103, each positive electrode sheet 101 is connected with a connecting tab 50, and each negative electrode sheet 103 is also connected with a connecting tab 50 .
  • the connecting tab 50 connected to the positive electrode sheet 101 is a positive tab
  • the connecting tab 50 connected to the negative electrode sheet 103 is a negative tab
  • the second end 10b of the wound electrode assembly 10 is covered with a protective glue, and at least two connecting tabs 50 extend from the first end 10a of the wound electrode assembly 10 after being bent multiple times to form Among the plurality of bent portions, one of the bent portions overlaps at least a portion of the electrode protective paste 601 in the thickness direction.
  • Figure 1 defines the X direction as the thickness direction.
  • the connecting tab 50 extends from the first end 10a of the wound electrode assembly 10
  • it is bent downward to form a first bent portion
  • the connecting tab 50 is bent upward again to form a first
  • the second bending portion partially overlaps with the electrode protective glue 601 covering the second end 10b of the wound electrode assembly 10 in the thickness direction.
  • the second bent portion and the electrode protective glue 601 partially overlap in the thickness direction
  • the second bent portion and the electrode protective glue 601 may also be made It completely overlaps, or the first bent portion and the electrode protection paste 601 may partially overlap.
  • the positive electrode sheet 101 and the negative electrode sheet 103 can be prepared using any process in the prior art.
  • the positive electrode sheet 101 may be formed by uniformly coating the positive electrode slurry on the positive electrode current collector aluminum foil, and then drying and rolling.
  • the negative electrode sheet 103 can be formed by uniformly coating the negative electrode slurry on the negative electrode current collector copper foil, and then drying and rolling.
  • any suitable slurry commercially available can be used as the positive electrode slurry and the negative electrode slurry.
  • the positive electrode slurry may include polyvinylidene fluoride (PVDF), nano-composite conductive agent, lithium nickel cobalt manganate Li (Ni x Co y Mn 1-xy ) O 2 and lithium iron phosphate Wait.
  • PVDF polyvinylidene fluoride
  • the negative electrode slurry may include sodium carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), nano-composite conductive agent, artificial graphite, and the like.
  • a connecting tab 50 is welded to each positive electrode sheet 101 and each negative electrode sheet 103. It can be understood that the positive electrode tabs welded on the positive electrode sheet and the negative electrode tabs welded on the negative electrode sheet are spaced apart to avoid short-circuiting the two.
  • the negative electrode tabs welded on the negative electrode sheet 103 may be overlapped along the thickness direction as shown in FIG. 1; similarly, the positive electrode The positive electrode tabs welded on the sheet 101 may also be overlapped along the thickness direction.
  • at least two of the plurality of positive electrode tabs for connecting the positive electrode sheet 101 may be staggered according to needs.
  • at least two of the plurality of negative electrode tabs for connecting the negative electrode sheet 103 may be staggered according to need.
  • the same material as the positive electrode sheet 101 may be used to make the positive electrode tab welded to the positive electrode sheet 101, that is, the positive electrode tab welded to the positive electrode sheet 101 in this embodiment is an aluminum tab.
  • the negative electrode tab welded to the negative electrode sheet 103 can also be made of the same material as the negative electrode sheet 103, that is, the negative electrode tab welded to the negative electrode sheet in this embodiment is a copper tab.
  • the separator for separating the positive electrode sheet 101 and the negative electrode sheet 103 may be made of polypropylene (PP), polyethylene (PE) or other suitable materials.
  • PP polypropylene
  • PE polyethylene
  • a polypropylene / polyethylene / polypropylene (PP / PE / PP) three-layer film structure with a thickness of 20-40 microns can be used as the separator, and its porosity can be between 45% and 60% between.
  • the electrode protective glue 601 can use UV glue, so that during the preparation of the lithium battery, the UV glue can be applied to the second end 10b of the wound electrode assembly 10 by a mechanized method, and then passed through the ultraviolet Only light curing is required, so that the production efficiency of the lithium battery core can be improved.
  • the electrode protective glue 601 may also use other suitable glue.
  • the second end 10b ie, the end opposite to the first end 10a provided with the connecting tab 50
  • the electrode protective glue 601 so that the wound
  • the positive electrode 101 and the negative electrode 103 of the second end 10b of the modular assembly are separated from Lushun, so that the aluminum plastic film 30 will not contact the positive electrode 101 and the negative electrode 103, so as to avoid the positive electrode 101 and the negative electrode 103 due to cutting or The burrs formed by other reasons puncture the aluminum-plastic film 30, which can effectively avoid the damage of the aluminum-plastic film 30 and improve the safety of the lithium battery.
  • the positive electrode sheet caused by the temperature change of the lithium battery during charging and discharging or due to other reasons
  • the thermal expansion and contraction of 101 and / or the negative electrode sheet 103 will not cause the aluminum plastic film 30 to be easily punctured, so that the safety of the lithium battery can also be improved.
  • the lithium battery cell further includes an adapter tab 70.
  • One end of the adapter tab 70 extends into the cavity formed by the aluminum-plastic film 30, and the other end
  • the aluminum plastic film 30 protrudes outside to serve as the electrical connection point of the lithium battery cell to the outside.
  • the surface of the welding segment 501 connecting the tab 50 away from the positive electrode sheet 101 and the negative electrode sheet 103 toward the electrode protective glue 601 is welded to the end of the transfer tab 70 extending into the aluminum-plastic film 30.
  • the connecting tab 50 can be hidden in the cavity of the aluminum-plastic film 30, so as to protect the connecting tab 50 and prevent subsequent operations from affecting the connection between the connecting tab 50 and the pole piece, Especially when a plurality of positive electrode pieces 101 and negative electrode pieces 103 are alternately stacked together, the connecting tab 50 is disposed in the cavity of the aluminum-plastic film 30 to avoid the shaking of the connecting tab 50.
  • FIG. 1 only shows a schematic structural diagram of the welding section 501 of the negative pole tab and one adapter tab 70 after welding, and the structural form of the welding section 501 of the positive pole tab and the adapter tab 70 is the same as this Or similar.
  • the outer surface of the welding mark 801 welded between the connecting tab 70 and the connecting tab 50 may be covered with a welding mark protective glue 603 (such as UV glue) to avoid the welding mark 801 or The burr on the welding section 501 of the connecting tab 50 punctures the aluminum plastic film 30, thereby improving the safety of the lithium battery cell.
  • a welding mark protective glue 603 such as UV glue
  • the UV sealant 603 can also use UV glue, so that during the preparation of the lithium battery, the UV glue can be applied to the welding section 501 and the area 801 of the welding mark 501 by mechanical means. Then it can be cured by ultraviolet light, so that the production efficiency of the lithium battery can be improved.
  • the solder paste protective glue 603 can also use other suitable glue. By covering the outer surface of the welding mark 801 welded on the connecting tab 70 and the connecting tab 50 with the welding mark protective glue 603, the lithium battery can avoid the burr of the welding mark 801 on the aluminum The potential threat of membrane 30. And because it can be produced in a mechanized manner, the processing efficiency of the lithium battery can also be improved.
  • solder mask protective glue 603 formed by the dispensing method will not easily spring off and fall off, which can improve the protection effect, and the solder mask protective glue 603 itself can increase the contact area with the diaphragm 105, thereby improving the fixing effect To further enhance the protection effect.
  • the second bent portion of the connecting tab 50 may be formed with a groove, so that one end of the transfer tab 70 extending into the cavity of the aluminum-plastic film 30 is inserted into the groove It is welded together with the part where the connecting tab 50 is located outside (that is, the part away from the positive electrode 101 and the negative electrode 103), so that the welding mark 801 is located on the surface of the connecting tab 50 facing away from the electrode protection glue 601.
  • the second bent portion of the tab 50 may be connected without forming a groove.
  • the end of the second bent portion shown in FIG. 1 is attached to the middle section of the connecting tab 50, and at this time, the transition tab 70 can be connected to the connecting pole from the outside of the end of the second bent portion
  • the ears 50 are welded together, so that the transfer tab 70 and the welding mark 801 of the connecting tab 50 are also located on the surface of the connecting tab 50 facing away from the electrode protection glue 601.
  • the end of the connecting tab 50 may not extend upward but directly extend parallel to the right.
  • the connecting tab 70 may be parallel It extends at the end of the second bending portion (that is, the transfer tab 70 extends to the left).
  • the welding mark 801 formed by welding the transfer tab 70 and the connecting tab 50 is located below.
  • the welding mark 801 may also be located at other suitable positions of the connecting tab 50, for example, it has been described above that the welding mark 801 may be located below FIG. 1.
  • the welding mark 801 can also be located at other positions in FIG. 1.
  • the connecting tab 50 of the lithium battery also includes the second bent portion shown in FIG. 1, and the adapter tab 70 is also inserted into the recess formed by the second bent portion as shown in FIG. 1 Inside the slot.
  • the adapter tab 70 it can be welded together with the part of the connecting tab 50 on the inner side (that is, the part close to the pole piece), so that the welding mark 801 is located on the connecting tab 50 toward the electrode protective glue 601 surface.
  • one end of the transfer tab 70 may also be bent to form a welding portion 701 extending in the thickness direction of the lithium battery, which is welded to the connecting tab 50 Segment 501 is welded together.
  • the connecting tab 50 is formed with a groove in the second bent portion as shown in FIG. 1, the welding portion 701 of the adapter tab 70 may be inserted into the groove as shown in FIG. 1, Therefore, the bending of the connecting tab 70 can cover the end of the connecting tab 50, avoid exposing the end of the connecting tab 50, and reduce the chance of contacting the end of the connecting tab 50 with the aluminum-plastic film 30, thereby reducing the connecting tab 50 The possibility of puncturing the aluminum plastic film 30 to improve the safety of the lithium battery cell.
  • the bent portion of the connecting tab 50 close to the welding portion 701 of the adapter tab 70 may exist along the thickness direction with the electrode protective glue 601 Overlap.
  • the second bent portion is a bent portion near the welding portion 701 of the adapter tab 70, and the second bent portion and the electrode protective glue 601 may be part along the thickness direction They overlap, or they can overlap completely.
  • the lithium battery core is optionally provided with a solder print protective glue 603 on the basis of the electrode protective glue 601.
  • the lithium battery core may also be provided with only the above-mentioned solder seal protective glue 603, which is illustrated as follows:
  • the lithium cell also includes a wound electrode assembly 10, an aluminum-plastic film 30 (not shown in FIG. 1) that wraps and seals the wound electrode assembly 10, and an adapter tab 70.
  • the wound electrode assembly 10 is mainly formed by stacking the positive electrode sheet 101, the separator 105, and the negative electrode sheet 103, and then winding them. At least two connecting tabs 50 are provided at the first end 10a of the wound electrode assembly 10, one of the connecting tabs 50 is connected to the positive electrode sheet 101 (eg, welding), and the other connecting tab 50 is connected to the negative electrode sheet 103 ( For example welding).
  • One end of the adapter tab 70 is inserted into the cavity formed by the aluminum-plastic film 30, and the other end is exposed outside the aluminum-plastic film 30.
  • the surface of the portion of the aluminum plastic film 30 facing the aluminum plastic film 30 that is, the right surface in FIG. 1 and the connecting tab 50 far from the positive electrode 101 and the negative electrode 103
  • the welding section 501 is welded, and the outer surface of the welding mark 801 of the connecting tab 70 and the connecting tab 50 is covered with a welding sealant 603 to prevent the burr on the welding mark 801 from puncturing the aluminum plastic film 30.
  • the solder resist 603 covers a portion of the outer surface of the solder pad 801 of the transfer tab 70 and the connecting tab 50; in other examples, the solder seal protection The glue 603 can cover all of the outer surface of the welding mark 801; in some other examples, the welding sealant 603 can also completely cover the surface of the welding section 501 of the connecting tab 50 facing the aluminum-plastic film 30.
  • FIG. 1 shows that the solder resist 603 completely covers the surface of the welding section 501 of the connecting tab 50 facing the aluminum-plastic film 30.
  • the connecting tab 50 further includes a connecting section 503 close to the positive electrode sheet 101 and the negative electrode sheet 103.
  • the surface of the connecting section 503 facing the aluminum-plastic film 30 is covered with a protective tab 605 for the tab.
  • a protective tab 605 for the tab It is UV glue or other suitable glue. It can be understood that when a plurality of connecting tabs 50 are stacked in the thickness direction, only the surface of the connecting segment 503 of the outermost connecting tab 50 facing the aluminum-plastic film 30 may be covered with the tab protective glue 605.
  • FIGS. 2 to 5 are schematic diagrams of the manufacturing process of the lithium battery core provided in this embodiment (the aluminum plastic film 30 is omitted). Among them, FIGS. 2 and 3 are top views, and FIGS. 4 and 5 are side views.
  • a wound electrode assembly 10 and two adapter tabs 70 are provided.
  • the wound electrode assembly 10 is mainly formed by stacking and winding a positive electrode sheet 101, a negative electrode sheet 103, and a separator 105, and a plurality of connecting tabs 50 are connected to the first end 10a of the wound electrode assembly 10.
  • a positive tab located on the left side of FIG. 2 is welded to the positive electrode sheet 101 of the wound electrode assembly 10
  • a negative electrode is welded to the negative electrode sheet 103 of the wound electrode assembly 10.
  • Polar ear located on the right side of Figure 2).
  • the second end 10b of the wound electrode assembly 10 is uniformly coated with UV glue by a dispenser (please refer to FIG. 4 together), so that the second end 10b of the wound electrode assembly 10 and the aluminum plastic film 30 Isolate to avoid puncturing the aluminum-plastic film 30.
  • one of the transfer tabs 70 is welded to the positive tab connected to the positive electrode sheet 101, and the other transfer tab 70 is welded to the negative tab connected to the negative electrode sheet 103.
  • the negative electrode tab for connecting the negative electrode sheet 103 is formed with a first bent portion located above and a second bent portion located below, and the connecting tab 70 is welded to the second bent portion End.
  • the structure of the connecting tab 50 and the connecting tab 70 connected to the positive electrode sheet is the same as or similar to the structure of the connecting tab 50 and the connecting tab 70 connected to the negative electrode sheet.
  • the surface of the connecting tab 50 facing the aluminum-plastic film 30 can also be uniformly coated with UV glue by a dispenser to prevent the burrs on the connecting tab 50 from puncturing the aluminum-plastic film 30. It is easy to understand that when a plurality of positive electrode sheets 101 and a plurality of negative electrode sheets 103 are alternately stacked together, it is possible to apply UV glue only to the surface of the outermost connecting tab 50 near the aluminum-plastic film 30. Of course, this The examples also do not exclude that all connecting tabs 50 are coated with UV glue.
  • the lithium battery of this embodiment is filled with an electrolyte in the aluminum-plastic film 30.
  • electrolyte refer to the electrolyte used in the lithium battery in the prior art, and no specific limitation is made in the present invention.
  • This embodiment also provides a smart battery, including a housing, a battery control board, and the above lithium battery.
  • the housing is provided with an accommodating part, the battery control board and the lithium battery core are installed in the accommodating part, and the battery control board and the lithium battery core are electrically connected.
  • the lithium battery cell is discharged or charged through the battery control board, and the battery control board can control the discharge or charge of the lithium battery cell.
  • the battery control board controls one or more of the voltage, current, temperature, power, or other factors in the process of discharging or charging the lithium cell, thereby controlling the process of charging or discharging the lithium cell.
  • a plurality of cells connected in parallel or in series are provided in the accommodating part.
  • the terms “installation”, “connected”, “connected”, “fixed” and other terms should be understood in a broad sense, for example, it can be fixed or detachable Connected, or integrated; may be directly connected or indirectly connected through an intermediate medium, may be the connection between the two elements or the interaction between the two elements, unless otherwise clearly defined.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种锂电芯，所述锂电芯包括：卷绕式电极组件，所述卷绕式电极组件主要由正极片、隔膜和负极片叠合并卷绕而成；所述卷绕式电极组件的第一端设置有至少两个连接极耳，其中一个连接极耳与所述正极片连接，另外一个连接极耳与所述负极片连接；铝塑膜，包覆所述卷绕式电极组件，并且密封所述卷绕式电极组件。在一些示例中，卷绕式电极组件的第二端可以包覆电极保护胶；在另一些示例中，该锂电芯还包括有一端伸入到铝塑膜的容腔内并与连接极耳远离正极片和负极片的焊接段焊接的转接极耳，在转接极耳和连接极耳焊接的焊印的外表面包覆有焊印保护胶。通过设置电极保护胶或者焊印保护胶，可以降低铝塑膜被刺破的风险，提高锂电芯的安全性。本发明还提供一种智能电池。

Description

智能电池及其锂电芯 技术领域
本发明涉及一种智能电池及其锂电芯，属于电池领域。
背景技术
“锂电池”，是一类由锂金属或锂合金为负极材料、使用非水电解质溶液的电池。在制造时，通过卷绕方式组合成形的电芯所组成的电池被称作卷绕式锂电池，业内也称为卷芯。一般来说，卷绕式锂电池都包括有卷绕式电极组件以及包覆在该卷绕式电极组件外面以将其密封的铝塑膜，其中，卷绕式电极组件主要由正极片、隔膜和负极片叠合并卷绕而成，在卷绕式电极组件的第一端设置有至少两个连接极耳，其中一个连接极耳与正极片连接，另外一个连接极耳与负极片连接。然而，这种卷绕式锂电池的铝塑膜存在被卷绕式电极组件中的连接极耳或者其他部件刺破的危险，从而会影响到锂电池的安全性。
发明内容
为了解决现有技术中存在的上述或其他潜在问题，本发明实施例提供一种智能电池及其锂电芯。
根据本发明的一些实施例，提供一种锂电芯，所述锂电芯包括：卷绕式电极组件，所述卷绕式电极组件主要由正极片、隔膜和负极片叠合并卷绕而成；所述卷绕式电极组件的第一端设置有至少两个连接极耳，其中一个连接极耳与所述正极片连接，另外一个连接极耳与所述负极片连接；铝塑膜，包覆所述卷绕式电极组件，并且密封所述卷绕式电极组件；其中，所述卷绕式电极组件的第二端包覆有电极保护胶，所述至少两个连接极耳从所述卷绕式电极组件的第一端延伸出后多次弯折，分别形成多个弯折部，并且其中一个所述弯折部在厚度方向与所述电极保护胶至少部分重叠。
根据本发明的一些实施例，提供一种锂电芯，所述锂电芯包括：卷绕式电极组件，所述卷绕式电极组件主要由正极片、隔膜和负极片叠合并卷绕而成；所述卷绕式电极组件的第一端还设置有至少两个连接极耳，其中一个连接极耳与所述正极片连接，另外一个连接极耳与所述负极片连接；铝塑膜，包覆所述卷绕式电极组件，并且密封所述卷绕式电极组件；转接极耳，其一端插入所述铝塑膜形成的容腔内，另外一端外露于所述铝塑膜外，所述转接极耳用于与所述连接极耳电连接；其中，所述连接极耳包括远离所述正极片和负极片的焊接段，所述转接极耳朝向所述铝塑膜的表面与所述焊接段焊接，所述转接极耳和所述连接极耳的焊印的外表面包覆有焊印保护胶。
根据本发明的一些实施例，提供一种智能电池，包括：外壳，设有容置部；上述锂电芯，所述锂电芯安装在所述容置部内；电池控制板，安装在所述容置部内，并与所述锂电芯电连接；其中，所述锂电芯通过所述电池控制板进行充电和放电，所述电池控制板用于对所述锂电芯的放电或充电进行控制。
根据本发明实施例的技术方案，通过在卷绕式电极组件的第二端设置电极保护胶，或者在转接极耳和连接极耳的焊接段焊接的焊印的外表面覆盖焊印保护胶，可以降低铝塑膜被刺破的风险，从而提高锂电芯的安全性。
本发明的附加方面的优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
通过参照附图的以下详细描述，本发明实施例的上述和其他目的、特征和优点将变得更容易理解。在附图中，将以示例以及非限制性的方式对本发明的多个实施例进行说明，其中：
图1为本发明实施例提供的锂电芯的侧视图；
图2至图5为本发明实施例提供的锂电芯的制备流程的示意图。
其中：
10-卷绕式电极组件；10a-第一端；10b-第二端；101-正极片；103-负极片；105-隔膜；30-铝塑膜；50-连接极耳；501-焊接段；503-连接段；601-电极保护胶；603-焊印保护胶；605-极耳保护胶；70-转接极耳；701-焊接部；801-焊印。
具体实施方式
下面结合附图，对本发明的一些实施方式作详细说明。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。
在本发明的描述中，需要理解的是，术语“上”、“下”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，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发明的限制。
图1为本发明实施例提供的锂电芯的侧视图。如图1所示，本实施例提供的锂电芯，包括：卷绕式电极组件10以及包覆并密封该卷绕式电极组件10的铝塑膜30。
卷绕式电极组件10主要由正极片101、隔膜105和负极片103叠合在一起以后再卷绕而成。例如，可以将叠合在一起的正极片101、隔膜105和负极片103按照Z形、S形或匚字形等任意合适的卷绕方式卷绕而成。在一些可选的示例中，卷绕式电极组件10包括有多个正极片101和多个负极片103。从而在制作卷绕式电极组件10时，可以将正极片101、隔膜105和负极片103交替叠合并卷绕而成。
在卷绕式电极组件10的第一端10a设置有至少两个连接极耳50，其中一个连接极耳50与正极片101连接(例如焊接)，另一个连接极耳50与负极片103连接(例如焊接)。例如，图1中示出了按照匚字形卷绕方 式卷绕而成的卷绕式电极组件10的第一端10a设置有与负极片103连接的负极极耳以及与正极片101连接的连接极耳50(图1中未示出)。当卷绕式电极组件10包括有多个正极片101和多个负极片103时，每个正极片101均连接有一个连接极耳50，每个负极片103也均连接有一个连接极耳50。
在下文中将与正极片101连接的连接极耳50为正极极耳，与负极片103连接的连接极耳50为负极极耳。
在卷绕式电极组件10的第二端10b包覆有保护胶，而且至少两个连接极耳50从卷绕式电极组件10的第一端10a延伸出来以后经过了多次弯折从而形成了多个弯折部，其中一个弯折部在厚度方向与电极保护胶601至少有部分是重叠的。以图1为例，定义X方向为厚度方向。如图1所示，连接极耳50从卷绕式电极组件10的第一端10a延伸出来以后先向下弯折形成了第一弯折部，然后连接极耳50又向上弯折形成了第二弯折部，且该第二弯折部与包覆在卷绕式电极组件10第二端10b的电极保护胶601在沿着厚度方向上有部分重叠。
应当理解，虽然上文中描述了第二弯折部与电极保护胶601沿着厚度方向上有部分重叠，但在其他一些可选的示例中，也可以使第二弯折部与电极保护胶601完全重叠，或者，也可以使第一弯折部与电极保护胶601部分重叠等等。
在本实施例中，正极片101和负极片103可以使用现有技术中的任意工艺制备而成。例如，在某些示例中，正极片101可以通过在正极集流体铝箔上均匀涂布正极浆料，然后再经干燥和辊压而成。同理的，负极片103可以通过在负极集流体铜箔上均匀涂布负极浆料，然后再经干燥和辊压而成。正极浆料和负极浆料可以采用市售的任意合适浆料。例如，在一些可选的示例中，正极浆料可以包括聚偏氟乙烯(PVDF)、纳米复合导电剂、镍钴锰酸锂Li(Ni xCo yMn 1-x-y)O 2和磷酸铁锂等。负极浆料则可以包括羧甲基纤维素钠(CMC)、丁苯橡胶(SBR)、纳米复合导电剂、人造石墨等。
在每一个正极片101和每一个负极片103上均焊接有连接极耳50。可 以理解，正极片上焊接的正极极耳和负极片上焊接的负极极耳间隔开，以避免二者短路。在某些示例中，当设置有多个正极片101和多个负极片103时，则负极片103上焊接的负极极耳可以如图1所示的沿着厚度方向重叠设置；同理，正极片101上焊接的正极极耳也可以沿着厚度方向重叠设置。当然，在其他一些示例中，多个用于连接正极片101的正极极耳中也可以至少有两个根据需要错开设置。同理，多个用于连接负极片103的负极极耳中也可以至少有两个根据需要错开设置。
可选地，可以采用与正极片101相同的材料来制作与该正极片101焊接的正极极耳，也即，本实施例与正极片101焊接的正极极耳为铝极耳。同理的，也可以采用与负极片103相同的材料来制作与该负极片103焊接的负极极耳，也即，本实施例与负极片焊接的负极极耳为铜极耳。通过将与正极片101和负极片103焊接的连接极耳50分别使用与正极片101和负极片103相同的材料，其可以具有相同的物理化学特性，例如电阻率和热膨胀系数等，而且还可以降低连接极耳50与极片的焊接难度。当然，在其他一些示例中，也可以使用任意合适的材料来制作连接极耳50，本实施例并不做具体限制。
用于隔离正极片101和负极片103的隔离膜可以采用聚丙烯(PP)、聚乙烯(PE)或者其他合适材料制作而成。例如，在某些示例中，可以采用厚度为20-40微米的聚丙烯/聚乙烯/聚丙烯(PP/PE/PP)三层膜结构作为隔离膜，其孔隙率可以在45％-60％之间。
在本实施例中，电极保护胶601可以使用UV胶，从而在制备锂电芯的过程中可以通过机械化的方式将UV胶涂覆在卷绕式电极组件10的第二端10b，然后再通过紫外光固化即可，从而可以提高锂电芯的制备效率。当然，电极保护胶601也可以采用其他合适的胶。
本实施例的锂电芯，通过在卷绕式组件的第二端10b(也即，与设置有连接极耳50的第一端10a相对的一端)包覆电极保护胶601，从而可以将卷绕式组件的第二端10b的正极片101和负极片103与旅顺隔离开来，使得铝塑膜30不会接触到正极片101和负极片103，以避免正极片101 和负极片103由于切割或者其他原因所形成的毛刺将铝塑膜30刺破，进而可以有效避免铝塑膜30的损坏，以提高锂电芯的安全性。当然，由于卷绕式组件的第二端10b与铝塑膜30之间已经被电极保护胶601隔开，则锂电芯在充放电过程中或者由于其他原因所导致的温度变化而引起的正极片101和/或负极片103的热胀冷缩也不会导致铝塑膜30被轻易刺破，从而也可以提高锂电池的安全性。
在一些可选的实施方式中，如图1所示，锂电芯还包括有转接极耳70，该转接极耳70的一端伸入到铝塑膜30所形成的容腔内，另一端伸出铝塑膜30外作为锂电芯对外的电连接点。连接极耳50远离正极片101和负极片103的焊接段501朝向电极保护胶601的表面与转接极耳70伸入到铝塑膜30内的一端焊接在一起。通过设置转接极耳70，可以将连接极耳50隐藏在铝塑膜30的容腔内，以便对连接极耳50进行保护，避免后续操作影响连接极耳50与极片之间的连接，尤其是当有多个正极片101和负极片103交替叠置在一起的时候，将连接极耳50设置在铝塑膜30的容腔内，可以避免连接极耳50的晃动。
需要说明的是，图1仅示出了负极极耳的焊接段501与一个转接极耳70焊接后的结构示意图，正极极耳的焊接段501与转接极耳70的结构形式与此相同或者类似。
可选地，在本实施例中，转接极耳70和连接极耳50焊接的焊印801的外表面以可以包覆有焊印保护胶603(例如UV胶)，以避免焊印801或者连接极耳50的焊接段501上的毛刺刺破铝塑膜30，从而提高锂电芯的安全性。
在本实施例中，焊印保护胶603也可以使用UV胶，从而在制备锂电芯的过程中可以通过机械化的方式将UV胶涂覆在连接极耳50的焊接段501和焊印801区，然后再通过紫外光固化即可，从而可以提高锂电芯的制备效率。当然，焊印保护胶603也可以采用其他合适的胶。通过在转接极耳70和连接极耳50焊接的焊印801外表面包覆焊印保护胶603，则锂电芯可以无需再通过手工贴胶纸的方式来避免焊印801的毛刺对铝塑膜 30的潜在威胁。而且由于可以采用机械化方式制作，还可以提高锂电芯的加工效率。同时，由于点胶方式形成的焊印保护胶603不会轻易的弹开脱落，可以提高保护效果，且其该焊印保护胶603本身就可以提高与隔膜105的接触面积，从而可以提高固定效果，以进一步增强保护效果。
如图1所示，又可选地，连接极耳50的第二弯折部可以形成有凹槽，以便转接极耳70伸入到铝塑膜30的容腔的一端插入到该凹槽内，并与连接极耳50位于外侧的部分(也即远离正极片101和负极片103的部分)焊接在一起，从而使得焊印801位于连接极耳50背离电极保护胶601的表面。
当然，在另一些示例中，连接极耳50的第二弯折部而也可以不形成凹槽。例如，图1中示出的第二弯折部的末端与连接极耳50的中间段贴合在一起，此时，转接极耳70可以从第二弯折部的末端的外侧与连接极耳50焊接在一起，从而，转接极耳70和连接极耳50的焊印801同样位于连接极耳50背离电极保护胶601的表面。
继续以图1为例，在某些示例中，连接极耳50在第二次弯折以后，其末端可以不往上延伸而是直接往右平行延伸，此时，转接极耳70可以平行于第二弯折部的末端延伸(也即转接极耳70往左延伸)，此时，转接极耳70和连接极耳50焊接所形成的焊印801位于下方。
在其他一些示例中，焊印801也可以位于连接极耳50其他合适位置，例如上文已经描述过了焊印801可以位于图1中的下方。当然，焊印801还可以位于图1中的其他位置。举例而言，假设锂电芯的连接极耳50同样包括了图1所示的第二弯折部，而且转接极耳70同样如图1所示的插入到第二弯折部所形成的凹槽内。在焊接转接极耳70时，可以将其与连接极耳50位于内侧的部分(也即靠近极片的部分)焊接在一起，从而使得焊印801位于连接极耳50朝向电极保护胶601的表面。
继续参考图1，在某些可选的示例中，转接极耳70的一端还可以弯折以形成沿锂电芯的厚度方向延伸的焊接部701，该焊接部701与连接极耳50的焊接段501焊接在一起。可选的，当连接极耳50如图1所示的在第 二弯折部形成有凹槽时，转接极耳70的焊接部701可以如图1所示的插入到该凹槽内，从而转接极耳70的弯折可以遮挡住连接极耳50的末端，避免连接极耳50的末端暴露，降低连接极耳50的末端与铝塑膜30接触的机会，进而减少连接极耳50刺破铝塑膜30的可能，以提高锂电芯的安全性。
容易理解，在本实施例中，当设置有转接极耳70时，与转接极耳70的焊接部701靠近的连接极耳50的弯折部可以沿着厚度方向与电极保护胶601存在重叠部分。以图1为例，可以看出，其第二弯折部为靠近转接极耳70的焊接部701的弯折部，该第二弯折部与电极保护胶601沿着厚度方向可以是部分重叠的，或者也可以是完全重叠的。
在此，需要说明一点，虽然上文详细介绍了锂电芯在设置了电极保护胶601的基础上还可选地设有置焊印保护胶603的方案。然而，在某些可选地示例中，锂电芯也可以仅仅设置有上述焊印保护胶603，举例说明如下：
如图1所示，锂电芯同样包括：卷绕式电极组件10、包覆并密封该卷绕式电极组件10的铝塑膜30(图1中未示出)以及转接极耳70。
卷绕式电极组件10主要由正极片101、隔膜105和负极片103叠合在一起以后再卷绕而成。在卷绕式电极组件10的第一端10a设置有至少两个连接极耳50，其中一个连接极耳50与正极片101连接(例如焊接)，另一个连接极耳50与负极片103连接(例如焊接)。
转接极耳70的一端插入到铝塑膜30形成的容腔内，另外一端外露在铝塑膜30外面。其中，转接极耳70插入到铝塑膜30的容腔内部分的朝向铝塑膜30的表面(也即图1中的右表面)与连接极耳50远离正极片101和负极片103的焊接段501焊接，在转接极耳70与连接极耳50的焊印801的外表面包覆有焊印保护胶603，以避免焊印801上的毛刺刺破铝塑膜30。
如图1所示，可选的，在一些示例中，焊印保护胶603覆盖转接极耳70和连接极耳50的焊印801的外表面的部分；在另一些示例中，焊印保护胶603则可以覆盖焊印801的外表面的全部；在其他一些示例中，焊印 保护胶603也可以完全覆盖连接极耳50的焊接段501朝向铝塑膜30的表面。例如，在图1中就示出了焊印保护胶603完全覆盖了连接极耳50的焊接段501朝向铝塑膜30的表面。
继续参考图1，连接极耳50还包括靠近正极片101和负极片103的连接段503，该连接段503朝向铝塑膜30的表面覆盖有极耳保护胶605，该极耳保护胶605可以是UV胶或者其他合适的胶。可以理解，当沿厚度方向叠置有多个连接极耳50时，则可以仅在最外层的连接极耳50的连接段503朝向铝塑膜30的表面覆盖极耳保护胶605。
图2至图5为本实施例提供的锂电芯的制备流程示意图(省略了铝塑膜30)。其中，图2和图3为俯视图，图4和图5为侧视图。
以下结合图2至图5对本实施例的锂电芯的制备过程进行简单的介绍，以便本领域技术人员更好的理解本实施例的方案。
如图2所示，提供卷绕式电极组件10以及两个转接极耳70。卷绕式电极组件10主要由正极片101、负极片103和隔膜105叠置并卷绕而成，在卷绕式电极组件10的第一端10a连接有多个连接极耳50。具体来说，请参考图2，在卷绕式电极组件10的正极片101上焊接有正极极耳(位于图2的左侧)，在卷绕式电极组件10的负极片103上焊接有负极极耳(位于图2的右侧)。在卷绕式电极组件10的第二端10b则通过点胶机均匀涂覆有UV胶(请一并参阅图4)，以便将卷绕式电极组件10的第二端10b与铝塑膜30隔离开，避免其刺破铝塑膜30。
如图3所示，将其中一个转接极耳70焊接到连接正极片101的正极极耳上，将另外一个转接极耳70焊接到连接负极片103的负极极耳上。请参阅图4，其中用于连接负极片103的负极极耳形成有位于上方的第一弯折部以及位于下方的第二弯折部，转接极耳70焊接在该第二弯折部的末端。同理的，与正极片连接的连接极耳50以及转接极耳70的结构同与负极片连接的连接极耳50和转接极耳70的结构相同或者类似。
如图5所示，将焊接后的连接极耳50和转接极耳70再进行弯折，并使用点胶机在焊印801区以及连接极耳50的末端均匀涂覆UV胶，然后通 过紫外光固化，从而形成覆盖焊印801外表面以及连接极耳50末端的焊印保护胶603，以保护铝塑膜30。
可选地，如图5所示，在连接极耳50朝向铝塑膜30的表面也可以通过点胶机均匀涂覆UV胶，以避免连接极耳50上的毛刺刺破铝塑膜30。容易理解，当多个正极片101和多个负极片103交替叠置在一起时，则可以只在位于最外层的连接极耳50靠近铝塑膜30的表面涂覆UV胶，当然，本实施例也不排除将所有的连接极耳50都涂覆UV胶。
以上仅是简单介绍了本实施例锂电芯的一种可选的制备方式，并非穷尽式列举，本领域技术人员可在上述制备方法的基础上经过简单变换制作出具有与本实施例相同结构的锂电芯，故上述制备方法不应视为对本实施例的具体限制。
最后，本实施例的锂电芯在铝塑膜30内注入有电解液，具体电解液的种类可以参照现有技术中锂电芯所使用的电解液，在本发明中不做具体的限制。
本实施例还提供一种智能电池，包括外壳、电池控制板以及上述锂电芯。其中，外壳设有容置部，电池控制板和锂电芯安装在该容置部内，并且电池控制板与锂电芯电连接。锂电芯通过电池控制板进行放电或充电，且该电池控制板能够对锂电芯的放电或充电进行控制。例如，电池控制板对锂电芯放电或者充电过程中的电压、电流、温度、功率或者其他因素中的一个或者多个进行控制，从而控制锂电芯充电或者放电的过程。
可选地，在容置部内设置有多个并联或者串联的电芯。
在本发明中，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，也可以是可拆卸地连接，或成一体；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或两个元件的相互作用关系，除非另有明确的限定。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。
在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、 “示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。此外，在不相互矛盾的情况下，本领域的技术人员可以将本说明书中描述的不同实施例或示例以及不同实施例或示例的特征进行结合和组合。
最后，尽管已经在这些实施例的上下文中描述了与本技术的某些实施例相关联的优点，但是其他实施例也可以包括这样的优点，并且并非所有实施例都详细描述了本发明的所有优点，由实施例中的技术特征所客观带来的优点均应视为本发明区别于现有技术的优点，均属于本发明的保护范围。

Claims (25)

  1. 一种锂电芯，其特征在于，所述锂电芯包括：
    卷绕式电极组件，所述卷绕式电极组件主要由正极片、隔膜和负极片叠合并卷绕而成；所述卷绕式电极组件的第一端设置有至少两个连接极耳，其中一个连接极耳与所述正极片连接，另外一个连接极耳与所述负极片连接；
    铝塑膜，包覆所述卷绕式电极组件，并且密封所述卷绕式电极组件；
    其中，所述卷绕式电极组件的第二端包覆有电极保护胶，所述至少两个连接极耳从所述卷绕式电极组件的第一端延伸出后多次弯折，分别形成多个弯折部，并且其中一个所述弯折部在厚度方向与所述电极保护胶至少部分重叠。
  2. 根据权利要求1所述的锂电芯，其特征在于，所述锂电芯还包括转接极耳，所述连接极耳包括远离所述正极片和负极片的焊接段，所述焊接段朝向所述电极保护胶的表面与所述转接极耳焊接。
  3. 根据权利要求2所述的锂电芯，其特征在于，所述连接极耳与所述转接极耳的焊印的外表面包覆有焊印保护胶。
  4. 根据权利要求3所述的锂电芯，其特征在于，所述焊印保护胶完全覆盖所述焊印。
  5. 根据权利要求4所述的锂电芯，其特征在于，所述焊印保护胶完全覆盖所述连接极耳的焊接段。
  6. 根据权利要求3所述的锂电芯，其特征在于，所述焊印位于所述连接极耳背离所述电极保护胶的表面。
  7. 根据权利要求3所述的锂电芯，其特征在于，所述转接极耳的一端弯折以形成焊接部，所述焊接部沿所述锂电芯的厚度方向延伸，所述连接极耳的焊接段焊接于所述焊接部。
  8. 根据权利要求7所述的锂电芯，其特征在于，所述连接极耳至少有一个弯折部靠近所述转接极耳的焊接部设置，且该弯折部形成有凹槽，所述转接极耳的所述焊接部位于所述凹槽内。
  9. 根据权利要求7所述的锂电芯，其特征在于，所述连接极耳包括靠近所述转接极耳的焊接部设置的弯折部，且该弯折部在厚度方向与所述电极保护胶至少部分重叠。
  10. 根据权利要求3所述的锂电芯，其特征在于，所述焊印保护胶为UV胶。
  11. 根据权利要求1所述的锂电芯，其特征在于，所述电极保护胶为UV胶。
  12. 根据权利要求1所述的锂电芯，其特征在于，与所述正极片连接的连接极耳为铝极耳，与所述负极片连接的连接极耳为铜极耳。
  13. 根据权利要求1所述的锂电芯，其特征在于，所述锂电芯还包括注入到所述铝塑膜内的电解液。
  14. 一种锂电芯，其特征在于，所述锂电芯包括：
    卷绕式电极组件，所述卷绕式电极组件主要由正极片、隔膜和负极片叠合并卷绕而成；所述卷绕式电极组件的第一端还设置有至少两个连接极耳，其中一个连接极耳与所述正极片连接，另外一个连接极耳与所述负极片连接；
    铝塑膜，包覆所述卷绕式电极组件，并且密封所述卷绕式电极组件；
    转接极耳，其一端插入所述铝塑膜形成的容腔内，另外一端外露于所述铝塑膜外，所述转接极耳用于与所述连接极耳电连接；
    其中，所述连接极耳包括远离所述正极片和负极片的焊接段，所述转接极耳朝向所述铝塑膜的表面与所述焊接段焊接，所述转接极耳和所述连接极耳的焊印的外表面包覆有焊印保护胶。
  15. 根据权利要求14所述的锂电芯，其特征在于，所述焊印保护胶覆盖所述连接极耳的焊接段朝向铝塑膜的表面。
  16. 根据权利要求14所述的锂电芯，其特征在于，所述连接极耳还包括靠近所述正极片和负极片的连接段，所述连接段朝向铝塑膜的表面覆盖有极耳保护胶。
  17. 根据权利要求16所述的锂电芯，其特征在于，所述极耳保护胶 为UV胶。
  18. 根据权利要求16所述的锂电芯，其特征在于，所述卷绕式电极组件主要由正极片、隔膜和负极片交替叠合卷绕而成，每个所述正极片均连接有一个连接极耳，每个所述负极片也均连接有一个连接极耳；所述极耳保护胶设置在最外侧的连接极耳的连接段上。
  19. 根据权利要求14所述的锂电芯，其特征在于，所述卷绕式电极的第二端包覆有电极保护胶。
  20. 根据权利要求19所述的锂电芯，其特征在于，所述电极保护胶为UV胶。
  21. 根据权利要求14所述的锂电芯，其特征在于，所述焊印保护胶为UV胶。
  22. 根据权利要求14所述的锂电芯，其特征在于，与所述正极片连接的连接极耳为铝极耳，与所述负极片连接的连接极耳为铜极耳。
  23. 根据权利要求14所述的锂电芯，其特征在于，所述锂电芯还包括注入到所述铝塑膜内的电解液。
  24. 一种智能电池，其特征在于，包括：
    外壳，设有容置部；
    权利要求1至23任一项所述的锂电芯，所述锂电芯安装在所述容置部内；
    电池控制板，安装在所述容置部内，并与所述锂电芯电连接；
    其中，所述锂电芯通过所述电池控制板进行充电和放电，所述电池控制板用于对所述锂电芯的放电或充电进行控制。
  25. 根据权利要求24所述的智能电池，其特征在于，所述锂电芯为多个，多个所述锂电芯串联或者并联。
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