CN113948759A - Battery monomer and lithium ion battery pack - Google Patents

Battery monomer and lithium ion battery pack Download PDF

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Publication number
CN113948759A
CN113948759A CN202111210242.XA CN202111210242A CN113948759A CN 113948759 A CN113948759 A CN 113948759A CN 202111210242 A CN202111210242 A CN 202111210242A CN 113948759 A CN113948759 A CN 113948759A
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China
Prior art keywords
positive
negative
tab
tabs
plate
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Pending
Application number
CN202111210242.XA
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Chinese (zh)
Inventor
王爱萍
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Dragonfly Laboratory Shenzhen Co ltd
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Dragonfly Laboratory Shenzhen Co ltd
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Priority to CN202111210242.XA priority Critical patent/CN113948759A/en
Publication of CN113948759A publication Critical patent/CN113948759A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M10/0445—Multimode batteries, e.g. containing auxiliary cells or electrodes switchable in parallel or series connections
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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

Abstract

The invention provides a battery monomer, which comprises a plurality of positive plates, a plurality of negative plates, tabs, a first fixing assembly and a second fixing assembly, wherein the positive plates and the negative plates are arranged at intervals in a staggered manner, adjacent positive plates and negative plates are connected in an insulating manner through diaphragms, and the tabs comprise first positive tabs, second positive tabs, first negative tabs and second negative tabs; the battery monomer realizes the fixation of the two ends of the positive plate and the two ends of the negative plate, and greatly enhances the encapsulation fixation of the positive plate and the negative plate, thereby avoiding the dislocation of the positive plate and the negative plate under the vibration and impact environment, enhancing the stability and the impact resistance of the plates, and prolonging the cycle service life of the lithium ion battery. Because the fixation of the positive plate and the negative plate is enhanced, the positive plate and the negative plate are separated by the common diaphragm, and the gluing diaphragm is not needed to fix the positive plate and the negative plate, thereby reducing the cost of the diaphragm. The invention also provides a lithium ion battery pack comprising at least two battery cells.

Description

Battery monomer and lithium ion battery pack
Technical Field
The invention relates to the field of batteries, in particular to a battery monomer and a lithium ion battery pack.
Background
With the development of the new energy automobile industry, the lithium ion power battery becomes a mainstream energy storage structure of the new energy automobile, the requirements on the energy density and the integration degree of the battery pack are higher and higher, and the long-size lithium ion battery gradually becomes one of mainstream development directions of the lithium ion battery due to the advantages of high energy density and high integration degree of the battery pack.
Because the positive and negative electrodes of the long-size lithium ion battery are respectively positioned at two ends of the length direction of the battery, and a lamination process is generally adopted, one end of the positive plate and one end of the negative plate are provided with the pole lugs, the pole lugs are welded and fixed with the cover plate, and the other end of the positive plate and the negative plate are in an unfixed state, under the conditions of vibration and impact, the non-pole lug end is easy to form dislocation of the positive and negative plates, the cycle life of the lithium ion battery is influenced, and even the risk of short circuit exists. In the prior art, a process of gluing a diaphragm and hot-pressing a pole core is adopted to fix a positive plate and a negative plate, and technological processes such as gluing, hot-pressing and the like are required to be added to fix the positive plate and the negative plate, but the process has the defects of higher cost, increased battery impedance and influence on the cycle performance of the battery.
Chinese patent publication No. CN 205723736U discloses a positive electrode tab fixing structure of a lithium battery, which includes a lithium battery body, a positive electrode tab and a negative electrode tab extending out of a packaging bag opening of the lithium battery body, and a nickel sheet welded on the upper surface of the positive electrode tab; the back of the lug part at the upper end of the welding point is provided with a silica gel layer which is folded inwards for 180 degrees along the welding point, and the silica gel layer is bonded with the lug at the lower end of the welding point. But this utility model discloses an anodal utmost point ear is connected with the one end of positive plate, and negative pole utmost point ear is connected with the one end of negative pole piece, and positive plate ear is fixed, and when the battery took place to vibrate, positive plate's the one end that does not have positive plate ear and negative pole piece took place to shift easily to influence the cycle life and the charge-discharge efficiency of battery.
Therefore, it is necessary to provide a battery cell and a lithium ion battery pack to solve the above problems in the prior art.
Disclosure of Invention
The invention aims to provide a battery monomer and a lithium ion battery pack, which aim to solve the problem that the service life of a battery is influenced by the fact that positive and negative pole pieces are easily dislocated in a vibration or impact environment.
In order to achieve the purpose, the battery monomer comprises a plurality of positive plates, a plurality of negative plates, tabs, a first fixing assembly and a second fixing assembly, wherein the positive plates and the negative plates are arranged at intervals in a staggered mode, the adjacent positive plates and the adjacent negative plates are connected in an insulating mode through diaphragms, each positive plate and each negative plate are provided with a first end and a second end which are arranged oppositely, and the tabs comprise a plurality of first positive tabs, a plurality of second positive tabs, a plurality of first negative tabs and a plurality of second negative tabs;
the first fixing assembly is connected with all the first positive lugs to fix the first ends of the positive plates and lead out the current of the positive plates;
the second ends of at least two positive pole pieces are provided with the second positive pole lugs, and all the second positive pole lugs are fixedly connected to fix the second ends of the positive pole pieces;
the first ends of at least two negative pole pieces are provided with the second negative pole ears, and all the second negative pole ears are fixedly connected to fix the first ends of the negative pole pieces;
the second end of the negative plate is provided with the first negative electrode lug, and the second fixing component is connected with all the first negative electrode lugs to fix the second end of the negative plate and lead out the current of the negative plate.
The battery monomer has the beneficial effects that: according to the battery cell, the first positive tab and the second positive tab are respectively arranged at the two opposite ends of the positive plate, all the first positive tabs are connected through the first fixing assembly to fix the first end of the positive plate and lead out the current of the positive plate, and all the second positive tabs are fixedly connected to fix the second end of the positive plate, so that the two ends of the positive plate are fixed; the two ends of the negative plate are respectively provided with a first negative tab and a second negative tab, all the first negative tabs are connected through a second fixing component to fix the second ends of the negative plate, and all the first ends of the negative plate are fixed through the fixed connection of all the second negative tabs, so that the fixation of the two ends of the negative plate is realized; the battery monomer realizes the fixation of the two ends of the positive plate and the two ends of the negative plate, and greatly enhances the encapsulation fixation of the positive plate and the negative plate, thereby avoiding the dislocation of the positive plate and the negative plate under the vibration and impact environment, enhancing the stability and the impact resistance of the plates and the battery, and prolonging the cycle service life of the lithium ion battery; because the second anode tab and the second cathode tab respectively enhance the fixation of the anode plate and the cathode plate, the anode plate and the cathode plate are separated only by adopting a diaphragm without adopting a gluing diaphragm for fixation, thereby reducing the cost of the diaphragm and avoiding the impedance problem caused by a gluing layer of the gluing diaphragm.
Optionally, all of the second positive tabs are electrically connected and all of the second negative tabs are electrically connected. The beneficial effects are that, because all the second anode tabs are fixedly connected to enable all the second anode tabs to be electrically connected, all the second cathode tabs are fixedly connected to enable all the second cathode tabs to be electrically connected, all the first anode tabs are electrically connected, all the first cathode tabs are electrically connected, so that the parallel connection mode of all the anode plates and the cathode plates is changed from the traditional single-side parallel connection mode into the double-side parallel connection mode, namely all the first ends of the anode plates are mutually parallel connected through the first anode tabs, all the second ends of the anode plates are mutually parallel connected through the second anode tabs, all the first ends of the cathode plates are mutually parallel connected through the second cathode tabs, and all the second ends of the cathode plates are mutually parallel connected through the first cathode tabs, thereby the current density distribution on the anode plates and the cathode plates is more uniform, and the impedance and the heat generation in the working process of the battery monomer are reduced, thereby prolonging the cycle life of the battery cell.
Optionally, all the second positive electrode tabs are fixedly connected in a manner of welding after kneading.
Optionally, all the second negative electrode tabs are fixedly connected by means of welding after kneading.
Optionally, the first positive tab and the second negative tab are located at the same end, and projections of the first positive tab and the second negative tab in the thickness direction of the positive plate do not overlap;
the first negative electrode tab and the second positive electrode tab are located at the same end, and projections of the first negative electrode tab and the second positive electrode tab in the thickness direction of the negative electrode piece are not overlapped. The battery fixing device has the advantages that all the first positive lugs and all the second negative lugs are not in contact in the respective fixing process and after being fixed, all the first negative lugs and all the second positive lugs are not in contact in the respective fixing process and after being fixed, the mutual insulation of the first positive lugs and the second negative lugs and the mutual insulation of the first negative lugs and the second positive lugs are ensured, and therefore the risk of short circuit of the battery is avoided.
Optionally, the battery cell further includes a first insulating auxiliary fixing component, and a shape of an end of the first insulating auxiliary fixing component contacting the second negative electrode tab is matched with a shape of a fixing portion of the second negative electrode tab, so as to fix the second negative electrode tab and insulate and isolate the second negative electrode tab and the first positive electrode tab. The negative pole lug fixing structure has the advantages that the first insulating auxiliary fixing assembly is matched with the shape of one end, in contact with the second negative pole lug, of the second negative pole lug in a fixing part shape, the effect of fixing the second negative pole lug is achieved, the second end of the negative pole piece is further fixed, the second negative pole lug and the first positive pole lug can be isolated in an insulating mode, and the electrical insulation of the first end of the negative pole piece and the first end of the positive pole piece is guaranteed.
Optionally, the battery cell further includes a second insulating auxiliary fixing component, and a shape of an end of the second insulating auxiliary fixing component, which is in contact with the second positive tab, is matched with a shape of a fixing portion of the second positive tab, so as to fix the second positive tab and insulate and isolate the second positive tab and the first negative tab. The auxiliary fixing assembly has the advantages that the shape of one end, in contact with the second positive tab, of the second insulating auxiliary fixing assembly is matched with the shape of the fixing portion of the second positive tab, the effect of fixing the second positive tab is achieved, the second end of the positive tab is further fixed, the second positive tab and the first negative tab can be isolated in an insulating mode, and the electrical insulation of the second end of the positive tab and the second end of the negative tab is guaranteed.
Optionally, the first fixing assembly includes a positive cover plate, a positive post is disposed on the positive cover plate, and the positive post is fixedly connected to all of the first positive lugs to draw out a current of the positive plate. The positive pole piece structure has the advantages that the positive pole posts are fixedly connected with all the first positive pole lugs to lead out the current of the positive pole piece, so that the first ends of all the positive pole pieces are fixed and electrically connected to lead out the current of the positive pole piece.
Optionally, the second fixing assembly includes a negative cover plate, a negative post is disposed on the negative cover plate, and the negative post is fixedly connected to all of the first negative tab to draw out a current of the negative plate. The negative pole tab fixing structure has the advantages that the negative pole posts are fixedly connected with all the first negative pole tabs to lead out the current of the negative pole tabs, and the second ends of all the negative pole tabs are fixed and electrically connected to lead out the current of the negative pole tabs.
The invention also provides a lithium ion battery pack which comprises at least two battery monomers, wherein the at least two battery monomers are connected in series or in parallel.
The lithium ion battery pack has the beneficial effects that: the lithium ion battery pack comprises at least two battery monomers, wherein the two ends of each battery monomer are provided with the positive electrode lugs, and the two ends of each negative electrode plate are provided with the negative electrode lugs, so that the two ends of each positive electrode plate and the two ends of each negative electrode plate are stably fixed, the vibration resistance and stability of the lithium ion battery pack are greatly enhanced, the dislocation of the positive electrode and the negative electrode is avoided, the service life of the lithium ion battery pack is prolonged, and the cost of a diaphragm of the lithium ion battery pack is reduced.
Drawings
Fig. 1 is a schematic front cross-sectional view of a battery cell according to a first embodiment of the invention;
fig. 2 is a schematic top cross-sectional view of a battery cell according to a first embodiment of the invention;
fig. 3 is a schematic top view of a positive electrode sheet according to a first embodiment of the present invention;
fig. 4 is a schematic top view of a negative electrode sheet according to a first embodiment of the present invention;
fig. 5 is a schematic front cross-sectional view of a battery cell according to a first embodiment of a second embodiment of the present invention;
fig. 6 is a schematic top cross-sectional view of a battery cell according to a first embodiment of a second embodiment of the present invention;
fig. 7 is a schematic top sectional view of a battery cell according to a second embodiment of the present invention.
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, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the 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. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. As used herein, the word "comprising" and similar words are intended to mean that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items.
Example one
Aiming at the problems in the prior art, the first embodiment of the invention provides a battery cell. Fig. 1 is a schematic front cross-sectional view of a battery cell according to a first embodiment of the invention; fig. 2 is a schematic top cross-sectional view of a battery cell according to a first embodiment of the invention.
Referring to fig. 1 and 2, the battery cell of the invention includes a plurality of positive plates 1, a plurality of negative plates 2, tabs, a first fixing assembly 3 and a second fixing assembly 4, the positive plates 1 and the negative plates 2 are alternately arranged, and the adjacent positive plates 1 and the adjacent negative plates 2 are in insulation connection through a diaphragm 5, each positive plate 1 and each negative plate 2 have a first end and a second end which are oppositely arranged, and the tabs include a plurality of first positive tabs 11, a plurality of second positive tabs 12, a plurality of first negative tabs 21 and a plurality of second negative tabs 22;
the first positive tab 11 is arranged at the first end of the positive tab 1, and the first fixing assembly 3 is connected with all the first positive tabs 11 to fix the first end of the positive tab 1 and lead out the current of the positive tab 1;
the second ends of at least two positive pole pieces 1 are provided with the second positive pole lugs 12, and all the second positive pole lugs 12 are fixedly connected to fix the second ends of the positive pole pieces 1;
the second negative electrode tabs 22 are arranged at the first ends of at least two negative electrode plates 2, and all the second negative electrode tabs 22 are fixedly connected to fix the first ends of the negative electrode plates 2;
the second ends of the negative plates 2 are provided with the first negative electrode tabs 21, and the second fixing assembly 4 is connected with all the first negative electrode tabs 21 to fix the second ends of the negative plates 2 and lead out the current of the negative plates 2.
The battery cell of the invention has the advantages that: according to the battery cell, the two opposite ends of the positive plate 1 are respectively provided with the first positive tab 11 and the second positive tab 12, all the first positive tabs 11 are connected through the first fixing assembly 3 to fix the first end of the positive plate 1 and lead out the current of the positive plate 1, and all the second positive tabs 12 are fixedly connected to fix the second end of the positive plate 1, so that the two ends of the positive plate 1 are fixed; the first negative electrode tab 21 and the second negative electrode tab 22 are respectively arranged at two ends of the negative electrode piece 2, all the first negative electrode tabs 21 are connected through the second fixing assembly 4 to fix the second end of the negative electrode piece 2, and all the second negative electrode tabs 22 are fixedly connected to fix the first end of the negative electrode piece 2, so that the fixation of the two ends of the negative electrode piece 2 is realized; the battery monomer realizes the fixation of the two ends of the positive plate 1 and the two ends of the negative plate 2, and greatly enhances the encapsulation fixation of the positive plate 1 and the negative plate 2, thereby avoiding the dislocation of the positive plate 1 and the negative plate 2 under the vibration and impact environment, enhancing the stability and the impact resistance of the pole pieces and prolonging the cycle service life of the lithium ion battery; because the second positive tab 12 and the second negative tab 22 strengthen the fixation of the positive plate 1 and the negative plate 2, the positive plate 1 and the negative plate 2 only need to be separated by a diaphragm without being fixed by a glue coating diaphragm, thereby reducing the cost of the diaphragm and avoiding the impedance problem caused by a glue coating layer.
In an alternative embodiment of the present invention, all of the first positive tabs 11 are electrically connected, all of the first negative tabs 21 are electrically connected, all of the second positive tabs 12 are electrically connected, and all of the second negative tabs 22 are electrically connected. The advantages are that, because all the second positive tabs 12 are electrically connected, all the second negative tabs 22 are electrically connected, and all the first positive tabs 11 are electrically connected, all the first negative tabs 21 are electrically connected, the parallel connection mode of all the positive plates 1 and the negative plates 2 is changed from traditional single-side parallel connection into double-side parallel connection, that is, the first ends of all the positive plates 1 are mutually connected in parallel through the first positive tabs 11, the second ends of all the positive plates 1 are mutually connected in parallel through the second positive tabs 12, the first ends of all the negative plates 2 are mutually connected in parallel through the second negative tabs 22, and the second ends of all the negative plates 2 are mutually connected in parallel through the first negative tabs 21, so that the current density distribution on the positive plates 1 and the negative plates 2 is more uniform, and the impedance and the heat generation of the battery monomer in the working process are reduced, thereby prolonging the cycle life of the battery cell.
As an alternative embodiment of the present invention, referring to fig. 1 and fig. 2, the first fixing assembly 3 includes a positive cover plate 31, a positive post 32 is disposed on the positive cover plate 31, and the positive post 32 is fixedly connected to all the first positive tabs 11 to draw out the current of the positive plate 1. The positive pole piece 32 is fixedly connected with all the first positive pole lugs 11 to lead out the current of the positive pole piece 1, so that the first ends of all the positive pole pieces 1 are fixed and electrically connected to lead out the current of the positive pole piece 1.
As an alternative embodiment of the present invention, projections of a plurality of the second positive tab in the thickness direction of the positive tab overlap each other, all the first positive tabs 11 are fixedly connected together by kneading and then welding, and all the first positive tabs 11 are fixedly connected together and then fixedly connected to the first positive tabs 11 by welding. The method has the advantages that all the first positive lugs 11 are fixedly connected in a welding mode after kneading, all the first positive lugs 11 and the positive posts 32 are fixed in a welding mode, fixing process flows and steps of the first positive lugs 11 are simplified, and production efficiency of the battery is improved.
As an alternative embodiment of the present invention, referring to fig. 1 and fig. 2, the second fixing assembly 4 includes a negative electrode cover plate 41, a negative electrode post 42 is disposed on the negative electrode cover plate 41, and the negative electrode post 42 is fixedly connected to all the first negative electrode tabs 21 to draw out the current of the negative electrode tab 2. The negative pole posts 42 are fixedly connected with all the first negative pole tabs 21 to draw out the current of the negative pole pieces 2, so that the fixation and the electrical connection of the second ends of all the negative pole pieces 2 are realized to draw out the current of the negative pole pieces 2.
As an alternative embodiment of the present invention, all the first negative electrode tabs 21 are fixedly connected together by kneading and welding, and all the first negative electrode tabs 21 are fixedly connected together and then fixedly connected to the negative post 42 by welding.
In an alternative embodiment of the present invention, all of the second positive electrode tabs 12 are fixedly connected by way of kneading and welding. The fixing device has the advantage of facilitating the fixing of all the second positive electrode lugs 12.
In some alternative embodiments, projections of a plurality of second positive electrode tabs 12 in the thickness direction of the positive electrode sheet 1 have an overlapping common portion, so that post-kneading welding of the second positive electrode tabs 12 is facilitated.
In an alternative embodiment of the present invention, all of the second negative electrode tabs 22 are fixedly connected by way of welding after kneading.
In some alternative embodiments, the projections of the second negative electrode tabs 22 in the thickness direction of the negative electrode sheet 2 overlap with each other, so that the kneaded and welded second negative electrode tabs 22 are facilitated.
As an alternative embodiment of the present invention, referring to fig. 2, the first positive tab 11 and the second negative tab 22 are located at the same end, and the projections of the first positive tab 11 and the second negative tab 22 in the thickness direction of the positive plate 1 do not overlap; the first negative tab 21 and the second positive tab 12 are located at the same end, and the projections of the first negative tab 21 and the second positive tab 12 in the thickness direction of the negative plate 2 are not overlapped. The advantage is that, by the above limitation, all of the first positive tabs 11 and all of the second negative tabs 22 are not in contact in the respective fixing process and after being fixed, so that all of the first negative tabs 21 and all of the second positive tabs 12 are not in contact in the respective fixing process and after being fixed, and the mutual insulation between the first positive tabs 11 and the second negative tabs 22 and the mutual insulation between the first negative tabs 21 and the second positive tabs 12 are ensured, thereby avoiding the risk of short circuit of the battery.
As an alternative embodiment of the present invention, the composition material of the separator includes one or more of polypropylene, polyamide, polyimide, polyethylene oxide, polyvinyl chloride, polyacrylonitrile-butadiene-styrene copolymer, polycarbonate, polymethyl methacrylate, polytetrafluoroethylene, polyvinyl alcohol, non-woven fabric and polyester. The battery cell glue coating method has the advantages that the diaphragm made of any one or more of the composite materials replaces the traditional glue coating diaphragm, so that the cost is reduced, the glue coating process is saved, the production efficiency of the battery cell is improved, and the cost of glue coating equipment and process is saved.
In some optional embodiments, fig. 3 is a schematic top view of a positive electrode tab according to a first embodiment of the present invention, and referring to fig. 2 and fig. 3, the number of the second positive electrode tabs 12 disposed at the second end of each positive electrode tab 1 is 2, and the width of the second positive electrode tab 12 is smaller than the width of the first positive electrode tab 11.
In some optional embodiments, fig. 4 is a schematic top view structure of a negative electrode tab according to an embodiment of the present invention, and referring to fig. 2 and 4, the number of the second negative electrode tabs 22 disposed at the first end of each negative electrode tab 2 is 2, and the width of the second negative electrode tab 22 is smaller than the width of the first negative electrode tab 21.
As an alternative embodiment of the present invention, referring to fig. 1 and 2, the battery cell further includes a battery case 6, a battery cavity 60 is disposed in the battery case 6, the battery cavity 60 is used for accommodating the positive electrode tab 1, the negative electrode tab 2 and an electrolyte, and the battery case 6 is used for fixing the first fixing assembly 33 and the second fixing assembly 44 to fix the positive electrode tab 1 and the negative electrode tab 2. Specifically, at least two openings (not shown) are disposed on the side surface or the top surface of the battery case 6, and the positive electrode cover plate 31 and the negative electrode cover plate 41 are respectively adapted to the two openings.
In some specific embodiments, the assembly process of the battery cell of the embodiments of the present invention is as follows:
alternately stacking the positive plate 1, the diaphragm 5 and the negative plate 2, and forming a battery pole core after alternately stacking the positive plate 1, the diaphragm 5 and the negative plate 2;
all the first positive lugs 11 are fixedly connected together in a welding mode through kneading and then ultrasonic welding, and then all the welding fixed ends of the first positive lugs 11 are connected with the positive post 32 in a welding mode through laser welding, so that the first end of the positive plate 1 is fixed, and the current of the positive plate 1 is led out through the positive post 32;
all the second positive lugs 12 are fixedly connected together in a manner of kneading and then ultrasonic welding so as to fix the second end of the positive plate 1;
all the first negative electrode tabs 21 are fixedly connected together in a welding mode through kneading and then ultrasonic welding, then all the welding fixed ends of the first negative electrode tabs 21 are connected with the negative pole posts 42 in a welding mode through laser welding, so that the second ends of the negative pole pieces 2 are fixed, and the current of the negative pole pieces 2 is led out through the negative pole posts 42;
all the second negative electrode tabs 22 are fixedly connected together in a manner of kneading and then ultrasonic welding, so that the first end of the negative electrode piece 2 is fixed;
after the battery pole piece is formed, the battery pole piece is placed in the battery cavity 60, and the positive electrode cover plate 31 and the negative electrode cover plate 41 are respectively fixedly packaged on the openings, so that the fixation of the battery pole piece is completed;
electrolyte is injected into the battery cavity 60 through the liquid injection hole, and then the battery case 6 is hermetically sealed.
Example two
The second embodiment of the invention provides a battery cell. Fig. 5 is a schematic front cross-sectional view of a battery cell according to a first embodiment of a second embodiment of the present invention; fig. 6 is a schematic top sectional view of a battery cell according to a first embodiment of a second embodiment of the present invention.
Referring to fig. 5 and 6, the battery cell of the present invention includes a plurality of positive plates 1, a plurality of negative plates 2, tabs, a first fixing assembly 3 and a second fixing assembly 4, where the positive plates 1 and the negative plates 2 are alternately arranged, and adjacent positive plates 1 and adjacent negative plates 2 are in insulation connection through a diaphragm 5, each positive plate 1 and each negative plate 2 have a first end and a second end that are arranged oppositely, and the tabs include a plurality of first positive tabs 11, a plurality of second positive tabs 12, a plurality of first negative tabs 21 and a plurality of second negative tabs 22;
the first positive tab 11 is arranged at the first end of the positive tab 1, and the first fixing assembly 3 is connected with all the first positive tabs 11 to fix the first end of the positive tab 1 and lead out the current of the positive tab 1; the second ends of at least two positive pole pieces 1 are provided with the second positive pole lugs 12, and all the second positive pole lugs 12 are fixedly connected to fix the second ends of the positive pole pieces 1;
the second negative electrode tabs 22 are arranged at the first ends of at least two negative electrode plates 2, and all the second negative electrode tabs 22 are fixedly connected to fix the first ends of the negative electrode plates 2; the second ends of the negative plates 2 are provided with the first negative tabs 21, and the second fixing assembly 4 is connected with all the first negative tabs 21 to fix the second ends of the negative plates 2 and lead out the current of the negative plates 2;
and the shape of one end of the first insulating auxiliary fixing component 7, which is in contact with the second negative electrode tab, is matched with the shape of the fixing part of the second negative electrode tab 22, so that the second negative electrode tab 22 is fixed and insulated and isolated, and the second negative electrode tab 22 and the first positive electrode tab 11 are fixed. The shape of the end, in contact with the second negative tab 22, of the first insulating auxiliary fixing component 7 is matched with the shape of the fixing part of the second negative tab 22, so that the second negative tab 22 is fixed, the second end of the negative plate 2 is further fixed, the second negative tab 22 and the first positive tab 11 can be isolated in an insulating manner, and the electrical insulation between the first end of the negative plate 2 and the first end of the positive plate 1 is ensured;
and a second insulating auxiliary fixing component 8, wherein the shape of one end, contacted with the second positive tab 12, of the second insulating auxiliary fixing component 8 is matched with the shape of a fixing part of the second positive tab 12, and the second insulating auxiliary fixing component is used for fixing the second positive tab 12 and insulating and isolating the second positive tab 12 and the first negative tab 21. The shape of the second insulating auxiliary fixing component 8 and the shape of one end, in contact with the second positive tab 12, of the second insulating auxiliary fixing component are matched with the shape of the fixing part of the second positive tab, so that the effect of fixing the second positive tab 12 is achieved, the second end of the positive tab 1 is further fixed, the second positive tab 12 and the first negative tab 21 can be isolated in an insulating mode, and the electrical insulation of the second end of the positive tab 1 and the second end of the negative tab 2 is guaranteed.
In some alternative embodiments of the second embodiment of the present invention, referring to fig. 5 and 6, the constituent material of the first insulating auxiliary fixing member 7 and the second insulating auxiliary fixing member 8 is an insulating material, such as plastic. A first groove 70 is formed at one end of the first insulating auxiliary fixing component 7, and a second groove 80 is formed at one end of the cylindrical structure of the second insulating auxiliary fixing component 8;
the shape of the first groove 70 is consistent with that of the fixed end of the second negative electrode tab 22, the shape of the second groove 80 is consistent with that of the fixed end of the second positive electrode tab 12, the second negative electrode tab 22 is inserted into the first groove 70, and the second positive electrode tab 12 is inserted into the second groove 80, so that the second negative electrode tab 22 and the second positive electrode tab 12 are fixed.
In other alternative embodiments of the second embodiment of the present invention, fig. 7 is a schematic top cross-sectional structure diagram of a battery cell in the second implementation manner of the second embodiment of the present invention. Referring to fig. 7, the first insulating auxiliary fixing assembly 7 includes a first plastic spacer 71 disposed on the first fixing assembly 3, the first plastic spacer 71 has an opening therein, the shape of the opening of the first plastic spacer 71 is identical to the shape of the fixed end of the second negative tab 22, so that the second negative tab 22 is fixed, and the first plastic spacer 71 is further used for insulating and isolating the second negative tab 22 from the first positive tab 11;
the insulating supplementary fixed subassembly 8 of second is including set up in second plastics space ring 81 on the fixed subassembly 4 of second, and the inside of second plastics space ring 81 is provided with the opening, the opening shape of second plastics space ring 81 with the stiff end shape of the anodal ear 12 of second is unanimous, the stiff end of the anodal ear 12 of second inlays and locates the opening of second plastics space ring 81 for the anodal ear 12 of second obtains fixedly, second plastics space ring 81 still is used for insulating the isolation the anodal ear 12 of second and first negative pole ear 21.
The invention also provides a lithium ion battery pack which comprises at least two battery monomers, wherein the at least two battery monomers are connected in series or in parallel.
The lithium ion battery pack has the advantages that: the lithium ion battery pack comprises at least two battery monomers, wherein the two ends of each battery monomer are provided with the positive electrode lugs, and the two ends of each negative electrode plate are provided with the negative electrode lugs, so that the two ends of each positive electrode plate and the two ends of each negative electrode plate are stably fixed, the vibration resistance and the stability of the lithium ion battery pack are greatly enhanced, the dislocation of the positive electrode and the negative electrode is avoided, the service life of the lithium ion battery pack is prolonged, and the cost of a diaphragm of the lithium ion battery pack is reduced.
To verify the effect of the battery cell of the embodiment of the present invention, the following test was also performed:
the battery monomer of the embodiment of the invention and the battery manufactured by the prior art are adopted to carry out a comparative test, and the specific comparative test is as follows:
preparing an example battery and a comparative battery, wherein the example battery and the comparative battery are selected from square aluminum shell lithium iron phosphate batteries with the capacity of 200 Ah;
the battery of the embodiment is manufactured based on the battery monomer of the embodiment of the invention, and the battery component comprises: the anode material is selected from a lithium iron phosphate material, and the anode current collector is selected from an aluminum foil with the thickness of 15 microns. The width of the positive plate is 90mm, and the length is 500 mm. One side of the positive plate is provided with a first positive lug connected with the positive post, and the width of the first positive lug is 40 mm; a second tab is arranged on the other side of the positive plate, and the width of the second tab is 10 mm;
the negative electrode material is selected from graphite materials, the negative electrode current collector is selected from copper foil with the thickness of 8 microns, and the diaphragm is a polypropylene diaphragm with the thickness of 14 microns. The width of the negative plate is 94mm, and the length is 510 mm. One side of the negative plate is provided with a first negative tab connected with the negative pole column, and the width of the first negative tab is 40 mm; and a second negative electrode tab is arranged on the other side of the negative electrode sheet, and the width of the second negative electrode tab is 10 mm.
The battery components of the comparative battery included: the anode material is selected from a lithium iron phosphate material, and the anode current collector is selected from an aluminum foil with the thickness of 15 microns; the width of the positive plate is 90mm, and the length is 500 mm. The negative electrode material is selected from graphite materials, the negative electrode current collector is selected from copper foil with the thickness of 8 microns, the width of the negative electrode sheet is 94mm, and the length of the negative electrode sheet is 510 mm. The diaphragm is an 18-micron polyvinyl chloride ceramic double-sided rubber-coated diaphragm.
The electrode composition parameters for the example cell and the comparative example cell were the same.
The pole core of the battery of the example was formed by stacking 43 layers of positive electrode sheets, 44 layers of negative electrode sheets, and a polypropylene separator in a Z-fold manner;
the pole core of the comparative example battery is formed by folding and stacking a positive plate 43 layer, a negative plate 44 layer and a polyvinyl chloride ceramic double-sided gluing diaphragm according to a Z shape;
the example battery and the comparative battery were formed by assembling the core electrode of each of the example and comparative example to form an aluminum-can battery, and then performing the processes of electrolyte injection, aging, formation, capacity grading, etc. to prepare a lithium ion battery.
The example cell and the comparative example cell were each tested under the same test conditions, and the test results thereof were recorded. The following battery performances were obtained through specific tests, and specific examples thereof are shown in table 1.
TABLE 1
Figure BDA0003308577280000141
As can be seen from the analysis of Table 1, the battery of the embodiment adopts the single battery structure of the invention, so that the fixation of the two ends of the positive and negative pole pieces is realized, and the impact resistance is basically consistent with that of the battery adopting the rubber coating diaphragm; the second positive tab and the second negative tab added in the battery of the embodiment improve the current density distribution uniformity of the pole core, and eliminate the influence of the glue coating diaphragm on the impedance of the battery, and the direct current internal resistance of the battery of the embodiment is obviously reduced, so that the temperature rise amplitude of the lithium battery during charging and discharging is reduced, and the charging and discharging stability of the battery is improved. Since the example uses a conventional polypropylene separator instead of a rubberized separator, the raw material cost and manufacturing cost of the example cell are less than those of the example cell.
Therefore, the single battery has the advantages of improving the stability and firmness of the positive electrode and the negative electrode in the battery, avoiding the dislocation of the positive electrode and the negative electrode, reducing the direct current internal resistance and the temperature rise during charging and discharging of the battery, improving the circulating charging stability of the battery, reducing the production cost, saving the cost of gluing equipment and hot-pressing equipment required by gluing the diaphragm, saving the time of gluing and hot-pressing process steps, improving the production efficiency of the battery and the like.
Although the embodiments of the present invention have been described in detail hereinabove, it is apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it is to be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the following claims. Moreover, the invention as described herein is capable of other embodiments and of being practiced or of being carried out in various ways.

Claims (10)

1. A battery monomer is characterized by comprising a plurality of positive plates, a plurality of negative plates, tabs, a first fixing assembly and a second fixing assembly, wherein the positive plates and the negative plates are arranged in a staggered and spaced mode, and are connected in an insulating mode through diaphragms, each positive plate and each negative plate are provided with a first end and a second end which are arranged oppositely, and the tabs comprise a plurality of first positive tabs, a plurality of second positive tabs, a plurality of first negative tabs and a plurality of second negative tabs;
the first fixing assembly is connected with all the first positive lugs to fix the first ends of the positive plates and lead out the current of the positive plates;
the second ends of at least two positive pole pieces are provided with the second positive pole lugs, and all the second positive pole lugs are fixedly connected to fix the second ends of the positive pole pieces;
the first ends of at least two negative pole pieces are provided with the second negative pole ears, and all the second negative pole ears are fixedly connected to fix the first ends of the negative pole pieces;
the second end of the negative plate is provided with the first negative electrode lug, and the second fixing component is connected with all the first negative electrode lugs to fix the second end of the negative plate and lead out the current of the negative plate.
2. The battery cell of claim 1, wherein all of the second positive tabs are electrically connected and all of the second negative tabs are electrically connected.
3. The battery cell as recited in claim 2, wherein all of the second positive tabs are fixedly connected by way of post-kneading welding.
4. The battery cell as recited in claim 2, wherein all of the second negative electrode tabs are fixedly connected by post-kneading welding.
5. The battery cell according to claim 1, wherein the first positive tab and the second negative tab are located at the same end, and projections of the first positive tab and the second negative tab in a thickness direction of the positive plate do not overlap;
the first negative electrode tab and the second positive electrode tab are located at the same end, and projections of the first negative electrode tab and the second positive electrode tab in the thickness direction of the negative electrode piece are not overlapped.
6. The battery cell according to claim 1, further comprising a first auxiliary insulating fixing component, wherein a shape of an end of the first auxiliary insulating fixing component contacting the second negative tab is matched with a shape of a fixing portion of the second negative tab, and the first auxiliary insulating fixing component is used for fixing the second negative tab and insulating and isolating the second negative tab and the first positive tab.
7. The battery cell as recited in claim 1, further comprising a second auxiliary insulation fixing component, wherein the shape of the end of the second auxiliary insulation fixing component contacting the second positive tab is matched with the shape of the fixing part of the second positive tab, so as to fix the second positive tab and insulate and separate the second positive tab and the first negative tab.
8. The battery cell as recited in claim 1, wherein the first fixing assembly comprises a positive cover plate, and a positive post is disposed on the positive cover plate and is fixedly connected with all the first positive tabs to draw out the current of the positive plate.
9. The battery cell as claimed in claim 1, wherein the second fixing component comprises a negative cover plate, and a negative post is disposed on the negative cover plate and fixedly connected with all the first negative tabs to draw out the current of the negative plate.
10. A lithium ion battery comprising at least two cells according to any one of claims 1-9, wherein at least two of the cells are connected in any one of series and parallel.
CN202111210242.XA 2021-10-18 2021-10-18 Battery monomer and lithium ion battery pack Pending CN113948759A (en)

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