CN114695899A - Pole piece and battery - Google Patents

Pole piece and battery Download PDF

Info

Publication number
CN114695899A
CN114695899A CN202011623865.5A CN202011623865A CN114695899A CN 114695899 A CN114695899 A CN 114695899A CN 202011623865 A CN202011623865 A CN 202011623865A CN 114695899 A CN114695899 A CN 114695899A
Authority
CN
China
Prior art keywords
pole piece
active material
material layer
blank area
battery
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.)
Pending
Application number
CN202011623865.5A
Other languages
Chinese (zh)
Inventor
廖栋梁
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 Xinda New Energy Technology Co ltd
Original Assignee
Shenzhen Xinda New 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 Xinda New Energy Technology Co ltd filed Critical Shenzhen Xinda New Energy Technology Co ltd
Priority to CN202011623865.5A priority Critical patent/CN114695899A/en
Priority to PCT/CN2021/139654 priority patent/WO2022143260A1/en
Publication of CN114695899A publication Critical patent/CN114695899A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • 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
    • H01M10/0436—Small-sized flat cells or batteries for portable equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • 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

Landscapes

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

Abstract

The invention discloses a pole piece, which relates to the technical field of pole pieces and comprises a current collector, a connecting belt and an active material layer; the number of the current collectors is more than two, and the connecting belt is positioned between the adjacent current collectors; be equipped with blank area and material covering district on the mass flow body, blank area is located the tip of mass flow body, and blank area is connected with the connecting band, and the active material layer is located the material covering district. The invention has the beneficial effects that: when the connecting belt is bent, the connecting belt is easy to bend, but the active material layer is not loaded on the connecting belt, so that the pole piece has excellent bending performance and safety.

Description

Pole piece and battery
Technical Field
The invention relates to the technical field of pole pieces, in particular to a pole piece and a battery.
Background
With the development of society, the portable electronic device brings great convenience in human life, and particularly with the popularization of wearable electronic devices, human life becomes more and more intelligent. For example, the noise reduction earphone can lead people to shield complex external noise and concentrate on doing things and enjoying high-quality music; for example, a massage device can relieve fatigue; the intelligent clothes, the intelligent watch and the bracelet can detect the body health data of people at any time, and in addition, the intelligent clothes can be used for warming people in winter and cooling people in summer.
These portable electronic devices currently provide great convenience to human life, but energy storage devices that power these smart portable devices have remained at the level of 20 years ago. At present, the conventional lithium batteries (square, cylindrical and spherical) are mainly used as energy storage devices for the portable electronic devices, and the energy storage devices have the defect of being incapable of being bent, so that the standby time of the smart watch, the bracelet and the earphone is short.
Patent application publication No. CN112002931A discloses a method for manufacturing a flexible battery pack and the flexible battery pack manufactured thereby, by arranging adjacent monomer battery cells at intervals and filling an encapsulant in gaps between the adjacent monomer battery cells, stress generated when the battery is repeatedly bent and folded can be effectively released, thereby preventing the performance of the flexible battery pack from being attenuated after bending. However, the prior art is directed to improvements in the methods of battery preparation. If the structure of the electrode is improved, the preparation steps of the battery can be simplified, and the mass production is convenient.
The patent application with publication number CN106531952A discloses a take pole piece of utmost point ear, and this pole piece includes a current collector piece, is provided with dressing district and blank area that is connected on the current collector piece, and the edge part in blank area extends the utmost point ear district that has an organic whole to be connected, and utmost point ear district and auxiliary material zone bit are in the both sides in blank area. But the performance of the pole piece after bending is difficult to maintain in the using process.
Disclosure of Invention
The invention aims to solve the technical problem that the performance of a pole piece after being bent in the using process is difficult to maintain in the prior art.
The invention solves the technical problems through the following technical means:
a pole piece comprises a current collector, a connecting belt and an active material layer; the number of the current collectors is more than two, and the connecting band is positioned between the adjacent current collectors;
be equipped with blank area and material covering district on the mass flow body, blank area is located the tip of mass flow body, blank area is connected with the connecting band, the active material layer is located the material covering district.
Has the advantages that: when the connecting belt is bent, the connecting belt is easy to bend, but the active material layer is not loaded on the connecting belt, so that the pole piece has excellent bending performance and safety.
The blank area that the mass flow body surface was reserved does not load active material layer, and this blank area is connected with the connecting band, can protect the active material layer of marginal portion when the pole piece encapsulation not destroyed, does not destroy the active material of edge when the battery is buckled, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
When the pole piece is used for the battery, the pole lugs can be directly welded on the blank area of the current collector, the integral internal resistance of the battery can be reduced, and the charge and discharge performance and capacity of the battery are improved. The connecting belt is not provided with the through hole, so that the internal resistance of the battery can be reduced.
Preferably, the number of the connecting bands is multiple.
Preferably, the connecting band is polygonal or any one side of the connecting band is arc-shaped.
Preferably, the connecting band is in a shape of a square, a trapezoid, a diamond, a convex polygon or a concave polygon.
Preferably, the number of the current collectors is two, and the blank area and the material covering area are respectively located at two ends of the current collector.
Preferably, the current collector covers the one end in material district and is equipped with and is used for utmost point ear welded to leave white district, it is located the both ends that cover the material district respectively to leave white district and blank area.
Has the advantages that: and a blank region is arranged at one end of the current collector covering region and used for welding a tab, and the second current collector covering region is not provided with the blank region, so that the size of the pole piece can be reduced.
Preferably, the number of the current collectors is greater than two, and the plurality of current collectors are distributed in an array.
Has the advantages that: can realize the crooked and folding of a plurality of directions, be particularly useful for intelligent clothing, and at crooked in-process, because the mass flow body of being connected with the connecting band is blank, can protect the active material layer of marginal portion when the pole piece encapsulation not destroyed, does not destroy the active material of edge when the battery buckles, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
Preferably, the number of the current collectors is four, and the four current collectors are distributed in two rows and two columns.
Preferably, the number of the current collectors is twenty, and the twenty current collectors are distributed in four rows and five columns.
Preferably, the shape of the current collector is square, circular, triangular, diamond-shaped or trapezoidal.
Preferably, the pole piece comprises a positive pole piece and a negative pole piece, a current collector in the negative pole piece is a copper foil, and the active material layer is a negative active material layer; the current collector in the positive pole piece is an aluminum foil, and the active material layer is a positive active material layer.
Preferably, the blank area is provided with an active material layer.
Has the advantages that: because the thickness of copper foil is generally less than the thickness of aluminium foil, set up anodal active material layer on the blank area of positive pole piece, can protect edge part not destroyed when the encapsulation, reduce the probability of battery short circuit simultaneously.
Preferably, the size of the blank area of the positive electrode plate is smaller than that of the blank area of the negative electrode plate.
Has the advantages that: the probability of battery short circuit is reduced.
The invention also provides a battery comprising the pole piece.
Has the advantages that: the battery provided by the invention has excellent bending performance and safety performance.
The invention has the advantages that: the connection tape is easily bent when being bent, but has excellent bending performance and safety because the connection tape is not loaded with the active material layer.
The blank area that the mass flow body surface was reserved does not load active material layer, and this blank area is connected with the connecting band, can protect the active material layer of marginal portion when the pole piece encapsulation not destroyed, does not destroy the active material of edge when the battery is buckled, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
When the pole piece is used for the battery, the pole lugs can be directly welded on the blank area of the current collector, the integral internal resistance of the battery can be reduced, and the charge and discharge performance and capacity of the battery are improved.
A blank area is arranged at one end of the current collector covering area and used for welding a tab, and the second current collector covering area is not provided with the blank area, so that the size of the pole piece can be reduced.
Can realize the crooked and folding of a plurality of directions, be particularly useful for intelligent clothing, and at crooked in-process, because the mass flow body of being connected with the connecting band is blank, can protect the active material layer of marginal portion when the pole piece encapsulation not destroyed, does not destroy the active material of edge when the battery is buckled, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
Drawings
FIG. 1 is a schematic structural diagram of a pole piece in example 1 of the present invention;
FIG. 2 is a schematic structural diagram of a pole piece in embodiment 2 of the present invention;
FIG. 3 is a schematic structural diagram of a pole piece in example 3 of the present invention;
FIG. 4 is a schematic structural diagram of a pole piece in example 5 of the present invention; wherein, the left side is a positive pole piece, and the right side is a negative pole piece;
FIG. 5 is a schematic structural diagram of a pole piece in example 6 of the present invention;
FIG. 6 is a schematic structural diagram of a pole piece in example 7 of the present invention;
FIG. 7 is a schematic view of a pole piece structure in example 8 of the present invention;
FIG. 8 is a schematic structural diagram of a pole piece in example 9 of the present invention;
FIG. 9 is a schematic structural diagram of a pole piece in example 10 of the present invention;
in the figure: a current collector 11; a first current collector 111; a second current collector 112; a blank region 12; a first blank area 121; a second blank area 122; a material-covering region 13; a first cladding region 131; a second dressing area 132; a connecting band 14; leaving a white region 15.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The test materials and reagents used in the following examples, etc., are commercially available unless otherwise specified.
The specific techniques or conditions not specified in the examples can be performed according to the techniques or conditions described in the literature in the field or according to the product specification.
Example 1
A pole piece, as shown in fig. 1, includes a current collector 11, a connection band 14, and an active material layer (not shown), where the current collector 11 is provided with a blank area 12 and a material-covering area 13, and the number of the current collectors 11 in this embodiment is two.
The current collector 11 includes a first current collector 111 and a second current collector 112, in this embodiment, the shapes of the first current collector 111 and the second current collector 112 are both square but not limited to square, or circular, triangular, diamond-shaped, or trapezoidal, the connection band 14 is located between the first current collector 111 and the second current collector 112, and in order to reduce the number of processes, the connection band 14 is integrally formed with the first current collector 111 and the second current collector 112 in this embodiment.
Two ends of the first current collector 111 are respectively provided with a first blank area 121 and a first material covering area 131, the first blank area 121 is rectangular, the first material covering area 131 is square, the size of the first blank area 121 is smaller than that of the first material covering area 131, and the first blank area 121 is connected with the connecting band 14.
The two ends of the second current collector 112 are respectively provided with a second blank area 122 and a second material covering area 132, the second blank area 122 is rectangular, the second material covering area 132 is square, the size of the second blank area 122 is smaller than that of the second material covering area 132, and the second blank area 122 is connected with the connecting band 14. In this embodiment, the first blank area 121, the connecting band 14 and the second blank area 122 are H-shaped, and the connecting band 14 is square.
Active material layers are respectively coated on the first and second coating regions 131 and 132.
In order to facilitate the tab welding, one end of the first covering region 131 or one end of the second covering region 132 is provided with a blank region 15, the blank region 15 and the first current collector 111 or the second current collector 112 are integrally formed, the blank region 15 and the first blank region 121 are respectively located at two ends of the first covering region 131, or the blank region 15 and the second blank region 122 are respectively located at two ends of the second covering region 132.
The electrode plate in this embodiment includes a positive electrode plate and a negative electrode plate, and when the first current collector 111 and the second current collector 112 are both copper foils, the active material layer is a negative active material layer, where the negative active material layer is in the prior art, and the electrode plate is a negative electrode plate at this time.
When the first current collector 111 and the second current collector 112 are both aluminum foils, the active material layer is a positive active material layer, wherein the positive active material layer is a prior art, and the pole piece is a positive pole piece.
The advantages of this embodiment are: when the connecting band 14 is bent, the connecting band 14 is easy to bend, but the connecting band 14 is not loaded with an active material layer, so that the pole piece has excellent bending performance and safety.
Blank 12 that the mass flow body 11 surface was reserved does not load active material layer, and blank 12 is connected with connecting band 14, can protect the active material layer of marginal portion not destroyed when the pole piece encapsulation, does not destroy the active material of edge when the battery is buckled, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
Example 2
The present embodiment is different from embodiment 1 in that: as shown in fig. 2, the number of the current collectors 11 is greater than two, and the plurality of current collectors 11 are distributed in an array. The number of mass flow body 11 is four in this embodiment, and four mass flow bodies 11 are two rows and two columns and distribute.
Example 3
This embodiment is different from embodiment 2 in that: as shown in fig. 3, the number of current collectors 11 is twenty, and the twenty current collectors 11 are distributed in four rows and five columns.
The advantages of this embodiment are: can realize the bending and folding of a plurality of directions, be particularly useful for intelligent clothing, and at crooked in-process, because the mass flow body 11 of being connected with connecting band 14 is blank 12, can protect the active material layer of marginal portion not destroyed when the pole piece encapsulation, does not destroy the active material at edge when the battery buckles, promotes the security of battery simultaneously, makes the battery can not take place the short circuit when buckling.
Example 4
The present embodiment differs from the above embodiments in that: the blank area of the positive pole piece is provided with a positive active material layer.
The advantages of this embodiment are: because the thickness of copper foil is generally less than the thickness of aluminium foil, set up anodal active material layer on the blank area of positive pole piece, can protect edge part not destroyed when the encapsulation, reduce the probability of battery short circuit simultaneously.
Example 5
The present embodiment differs from the above embodiments in that: as shown in fig. 4, the left side in the figure is the positive electrode plate, the right side in the figure is the negative electrode plate, and the size of the blank area of the positive electrode plate is smaller than that of the blank area of the negative electrode plate.
The advantages of this embodiment are: the probability of a short circuit of the battery can be reduced.
Example 6
This embodiment is different from embodiment 1 in that: as shown in fig. 5, the first blank area 121, the connecting band 14 and the second blank area 122 are square.
Example 7
This embodiment is different from embodiment 1 in that: as shown in fig. 6, the connecting band 14 has a trapezoidal shape. The shape and number of the connecting bands 14 may be arbitrarily combined.
Example 8
This embodiment is different from embodiment 1 in that: as shown in fig. 7, the number of the connecting bands 14 is plural, and the number of the connecting bands 14 in this embodiment is 2, but not limited to two. The shape and number of the connecting bands 14 may be arbitrarily combined.
Example 9
This embodiment is different from embodiment 1 in that: as shown in fig. 8, the connection band 14 has a dodecagon shape. The shape and number of the connecting bands 14 may be arbitrarily combined.
Example 10
This embodiment is different from embodiment 1 in that: as shown in fig. 9, the connecting band 14 is rectangular, wherein both sides of the connecting band 14 are arc-shaped, and the bending direction of the arc-shaped is set according to actual requirements. The shape and number of the connecting bands 14 may be arbitrarily combined.
Example 11
This embodiment is different from embodiment 1 in that: the blank region 12 is provided with an active material layer.
Example 12
This embodiment is different from embodiment 2 in that: wherein 1 or 7 blank regions 12 are provided with an active material layer.
Example 13
The present embodiment differs from the above embodiments in that: the present embodiment provides a battery, which includes a positive electrode plate, a diaphragm, and a negative electrode plate, where the positive electrode plate, the diaphragm, and the negative electrode plate are sequentially wound or stacked, and a shape of the diaphragm corresponds to a shape of the positive electrode plate and a shape of the negative electrode plate.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. A pole piece, characterized by: the pole piece comprises a current collector, a connecting belt and an active material layer; the number of the current collectors is more than two, and the connecting band is positioned between the adjacent current collectors;
be equipped with blank area and material covering district on the mass flow body, blank area is located the tip of mass flow body, blank area is connected with the connecting band, the active material layer is located the material covering district.
2. The pole piece of claim 1, wherein: the number of mass flow body is two, blank area and material covering district are located the both ends of mass flow body respectively.
3. The pole piece of claim 1, wherein: one end in the mass flow body material covering area is equipped with and is used for utmost point ear welded to leave white district, it is located the both ends in material covering area respectively with blank district to leave white district.
4. The pole piece of claim 1, wherein: the number of the current collectors is more than two, and the current collectors are distributed in an array.
5. The pole piece of any one of claims 1 to 4, wherein: the number of the connecting bands is multiple.
6. The pole piece of claim 5, wherein: the connecting belt is polygonal or any side of the connecting belt is arc-shaped.
7. The pole piece of claim 6, wherein: the pole piece comprises a positive pole piece and a negative pole piece, wherein a current collector in the negative pole piece is a copper foil, and the active material layer is a negative active material layer; the current collector in the positive pole piece is an aluminum foil, and the active material layer is a positive active material layer.
8. The pole piece of claim 1, wherein: the blank area is provided with an active material layer.
9. The pole piece of claim 7, wherein: the size of the blank area of the positive pole piece is smaller than that of the blank area of the negative pole piece.
10. A battery, characterized by: the battery includes the pole piece of any one of claims 1-9.
CN202011623865.5A 2020-12-30 2020-12-30 Pole piece and battery Pending CN114695899A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202011623865.5A CN114695899A (en) 2020-12-30 2020-12-30 Pole piece and battery
PCT/CN2021/139654 WO2022143260A1 (en) 2020-12-30 2021-12-20 Pole piece, battery comprising pole piece, and manufacturing methods

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011623865.5A CN114695899A (en) 2020-12-30 2020-12-30 Pole piece and battery

Publications (1)

Publication Number Publication Date
CN114695899A true CN114695899A (en) 2022-07-01

Family

ID=82135364

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011623865.5A Pending CN114695899A (en) 2020-12-30 2020-12-30 Pole piece and battery

Country Status (1)

Country Link
CN (1) CN114695899A (en)

Similar Documents

Publication Publication Date Title
CN213958993U (en) Pole piece with through hole and battery
JP6667509B2 (en) Flexible battery, method of manufacturing the same, auxiliary battery including flexible battery, and mobile electronic device
JP6667508B2 (en) Flexible battery, manufacturing method thereof, and auxiliary battery including flexible battery
JP2000200585A (en) Battery package
JP2011065998A (en) Secondary battery
KR20150128402A (en) Flexible secondary battery
JP7193626B2 (en) Secondary battery and its electrode member
CN209249577U (en) A kind of battery module and battery pack
CN216354298U (en) Pole piece, laminated battery cell, battery and electronic product
CN111244526A (en) Flexible battery and electronic equipment
CN214043714U (en) Pole piece and battery
CA2937791C (en) Coin cell comprising two cases
JP2011008976A (en) Complex thin film battery
CN105355850A (en) Flexible electrode and battery employing same
CN110402512A (en) Battery grid
CN109417151A (en) Using the battery unit of busbar
CN114695899A (en) Pole piece and battery
EP3147963B1 (en) Battery case having anti-wrinkle pattern
CN218783051U (en) Negative plate and battery
CN205264793U (en) Comb form flexible electrode and flexible battery, watchband and neck ring
CN114695898A (en) Pole piece with through hole and battery
CN105489831B (en) The comb teeth-shaped flexible electrode being arranged back-to-back and the battery comprising the electrode
CN215418283U (en) Flexible battery of fatigue deformation resistance
CN209592228U (en) Secondary cell
CN113328066A (en) Lead storage battery and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination