CA2561342C - Core structure for a square lithium secondary battery - Google Patents

Core structure for a square lithium secondary battery Download PDF

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Publication number
CA2561342C
CA2561342C CA2561342A CA2561342A CA2561342C CA 2561342 C CA2561342 C CA 2561342C CA 2561342 A CA2561342 A CA 2561342A CA 2561342 A CA2561342 A CA 2561342A CA 2561342 C CA2561342 C CA 2561342C
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Prior art keywords
positive
negative
conductive
layer
area
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CA2561342A
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French (fr)
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CA2561342A1 (en
Inventor
Donald P. H. Wu
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Pihsiang Energy Technology Co Ltd
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Individual
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Priority to CA2561342A priority Critical patent/CA2561342C/en
Publication of CA2561342A1 publication Critical patent/CA2561342A1/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0463—Cells or batteries with horizontal or inclined electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—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
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

A core structure for a square lithium secondary battery comprises: a core, an electrode assembly, and two conductive fixing assemblies. The respective layers of the positive and negative lead areas are clamped together by the conductive pressing pieces, therefore, the structure of the present invention is simple. In addition, the respective layers of the positive and negative lead areas are pressed against and in electrical contact with one another directly. Therefore, the internal resistance of the present invention is relative low, and is suitable for use in the high capacity battery case.

Description

CORE S'Y'RUCY'URE FOR A SOUARE L.ITHIUM SECONDARY BATTERY
BACKGROUND_QF 'T_HI1INVENTION

Field of the Invention The present invention relates to a core structure for a square lithium secondary battery, and more particularly to the design of a conductive connecting structure for a core of a lithium secondary battery.

Description of the Prior Art Most of square lithium secondary batteries are low capacity and rechargeable. For exainple, US Pat. No. 5,844,109 discloses a commonly used low capacity type square lithium secondary battery, as shown in Fig. 1, wherein the core assembly 10 essentially comprises: an electrode assembly 11, a plurality of positive and negative leads 121, 122, and two conductive sleeves 13. The electrode assembly 11 generally includes a positive layer, a separating layer, and a negative layer that are superposed one another. The electrode is a multi-layer structure formed by superposing or winding method, and a plurality of positive and negative leads extends form the respective positive and negative layers, and finally two conductive pressing pieces are used as an integral lead for the respective positive or negative leads.

The abovementioned secondary lithium battery is very simple, but its structure is too weak, and is only suitable for being used as a structure of a low capacity battery but not for high capacity dynamic battery. As shown in Figs.
2 and 3, an electrode assembly 20 for a square battery disclosed in TW Pat. No.
1,233,227 comprises a positive layer, a separating layer, and a negative layer that are superposed one another. The electrode assembly 20 is a whorled multi-layer structure winding around a base board2l. An uncoated area 22 is formed at a side of each of the positive and negative layers, and then a plurality of main spacers 23 and sub-spacers 24 are disposed on the uncoated areas 22 of the respective layers of the electrode assembly 20, and finally a plurality of fixing pins 25 is inserted through the main spacers 23, the sub-spacers 24 and the base board2l, thus forming an integrated electrical connection structure of the electrode assembly.

It is to be noted that the base board not only iYnproves the structural strength of the battery structure but also the multiple positive or negative layers can be firnily wound around the base plate, therefore, this design is suitable for use in a high capacity battery.

The conventional lead can be omitted by connecting the main spacers and the sub-spacers directly to the respective layers of the electrode assembly can omit the conventional leads, and thus the process for welding or forming the leads can be omitted. Howevor, in this battery shme.ture, each of the layers of the electrode assambly must be equipped with a nnain spacer and a sub-spacer. If the number of the layers is great, the number of the main spacers and the sub-spacers will increase accordingly, this will not only lead to an increase of the production cost and complication of the assembling process. And more important, the main spacers disposed in the respective layers of the electrode assembly will increase the internal resistance (contact resistance) of the core structum of the battery, and resulting in the problems of temperature increase and energy waste. And in the charge and disGhage process of a high capacity battery, high contact resistance will lead to the high-temperature caused oxidation of the uncoated area of the electrode assembly The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.

SUMMARY OF'T_HE ON

The primary objective of the present invention is to provide a core structure for a square lithium secondary battery. The respective layers of the positive and negative lead areas are clamped together by the conductive pressing pieces, therefore, the structure of the present invention is simple. In addition, the respective layers of the positive and negative lead areas are pressed against and in electrical contact with one another directly, therefore, as compared with the conventional structure, the internal resistance of the present invention is relatively low, and is suitable for use in the high capacity battery case.

The secondary objective of the present invention is to provide a core structure for a sciuare lithium secondary battery. The respective layers of the positive and negative lead areas are clamped together by the conductive pressing pieces, since the structure of the present invention is simple, the resultant cost and the complexity of the assembling process will be reduced substantially.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1, is an illustrative view of a conventional core structure for a lithium secondary battery disclosed in US Pat. No. 6,844,109;

Fig. 2 is an exploded view of a conventional core structure for a lithium secondary battery disclosed in TW Pat. No. 1,233,227;

Fig. 3 is an assembly view of a conventional core structure for a lithium
3 secondary battery disclosed in TW Pt No 1233227:

Fig. 4 is a perspec.tive view of showing a core structure for a lithium secondary battery in accordance with the present invention;

Fig. 5 is an assembly view of showing the core structure for a lithium secondary battery in accordance with the present invention;

Fig. 6 is a cross sectional view of showing the core structure for a lithium secondary battery in accordance with the present invention;

Fig. 7 is an exploded view in accordance with the present invention of showing the core structure for a lithium secondary battery before being instalIed in the battery case;

Fig. 8 is a cross sectional view in accordance with the present invention of showing the oore stnichue for a lithium secondary battery after being installed in the battery case; and Fig. 9 is a cross sectional view in accordance with the present invention of showing the interior of the battery case, wherein the core structure is additionally provided with conductive sleeves.

DLTAIIrED DESCRIPTTON OF THE PREFERRED EMBODIMENTS

The present invention will be more clear from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.

Referring to Figs. 4-7, a core structnre for a square lithium secondary battery in accordance with a preferred embodiment of the present invention
4 comprises: a base board 40, an electrode assembly 50, and two conductive fixing assemblies 60. The core structure is disposed in a square battery case 30, and the positive and negative lead terminals 31, 32 on both ends of the battery case 30 are electrically connected by two connecting members 70.

The base board 40 is disposed in the battery case 30.

The electrode assembly 50 includes at least one positive layer 51, one separating layer 52 and one negative layer 53 that are superposed one another and then wind around the base board 40. The surfaces of the positive and negative electrode layers 51, 53 are coated with positive electrode material and negative electrode material, respectively. The separating layer 52 is located between the positive and negative electrode layers 51, 53. An uncoated area is formed at a side of the positive layer 51 for use as a positive lead area 511, and the negative layer 52 is forrned at another side thereof opposite the positive layer 51 with an uncoated area for use as a negative lead area 531. The positive and negative lead areas 511 and 531 protrude out of both sides of the assembly of positive layer 51, the separating layer 52 and the negative layer 53. After the electrode assembly 50 is formed by winding the positive layer 51, the separating layer 52 and the negative layer 53 around the base board 40, the positive and negative lead areas 511 and 531 will protrude out of both ends of the electrode assembly 50.

Each of the conductive fixing assemblies 60 includes a fastener 61 and two conductive pressing pieces 62. The conductive pressing pieces 62 each is formed with a through hole 621 and is disposed outside the positive lead area 511 or the negative lead area 531. The fastener can be a bolt and is inserted through the through s hole 621 of one of the conductive pressing pieces 62, the base board 40, and the through hole 621 of another one of the conductive pressing pieces 62, so that the two conductive pressing pieces 62 are fixed on the base board 40 and are firmly pressed against the positive lead area 511 or the negative lead area 531, and the positive lead area 511 or the negative lead area 531 arc maintained in a close electrical contact with the conductive pressing pieces 62.

Each of the connecting members 70 is a conductive and curved flexible structure having one end electrically connected to the conductive pressing pieces 62 of the electrode assembly 50 and another end electrically connected to the positive lead terminal 31 or the negative lead terrninal 32.

The core structure and the arrangement relation of the components thereof are mentioned above. The present invention intends to further improve the design of the core structure and to use the connecting member as an electrical conductive connection for connecting the conductive pressing pieces to the positive lead area or the negative lead area, and the connecting member is a curved flexible structure. By such arrangements, even if there is a dimension error in the core or the case, which can be overcome by the deformation of the eonnecting member, and thus the battery can be assembled successsfully.

Referring to Figs. 4-8 again, the large uncoated lead areas 511 and 531 are left on the electrode assembly 50, and the positive and negative lead areas 511, 531 are multi-layer structure. The c:onductive pressing pieces 62 of the conductive fixing assemblies 60 are fixed outside of the positive and negative lead areas 511, 531, and the fastener 61 passes through the through hole 621 of the conductive pressing piece 62 and the base board 40 and is fixed thereto, so that a part of the conductive pressing pieces 62 is firmly pressed against the respective layers of the positive and negative lead areas 511, 531. In this way, electric energy of the electrode assembly 50 can be outputted smoothly from the conductive pressing pieces 62 via the positive and negative lead areas 511, 531.

It is to be noted that the respective layers of the positive and negative lead areas 511, 531 are clamped together by the conductive pressing pieces 62, therefore, the structure of the present invention is simple. In addition, the respective layers of the positive and negative lead areas 511, 531 are pressed against and in electrical contact with one another directly. Therefore, as compared with the conventional structure made of the main and sub-spacers, the internal resistance of the present invention is obviously low, and is suitable for use in the high capacity battery case.

In addition, as shown in Fig. 9, either end of the base board 40 can be covered with a conductive sleeve 80, when the conductive pressing pieces 62 are pressed against the positive and negative lead areas 511, 531, the conductive sleeve 80 can improve the electtical connection between the pressing surfsces of the positive and negative lead ueas 511, 531, thus increasing the current path in the charge and discharge process of the battery, and reducing the resistance of the battery.

While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.

Claims (3)

WHAT IS CLAIMED IS:
1. A core structure for a square lithium secondary battery being disposed in a battery case and electrically connected to positive and negative lead terminals of the battery case by two connecting members, the core structure comprising:

an isolating base board disposed in the battery case;

an electrode assembly including at least one positive layer, one separating layer and one negative layer, wherein the positive layer, the separating layer and the negative layer are superposed one another and then wind around the base board, an uncoated area is formed at a side of the positive layer for use as a positive lead area, and the negative layer is formed at another side thereof opposite the positive layer with an uncoated area for use as a negative lead area, the positive and negative lead areas protrude out of both sides of the electrode assembly;

two conductive fixing assemblies each including at least one fastener and one conductive pressing pieces, wherein the conductive pressing pieces are disposed outside the positive lead area or the negative lead area, the fastener is inserted through a through hole of one of the conductive pressing pieces is fixed on the base board, so that the conductive pressing piece is firmly pressed against the positive lead area or the negative lead area, and the positive lead area or the negative lead area is maintained in a close electrical contact with the conductive pressing piece, the conductive fixing assemblies are electrically connected to the positive lead terminal or the negative lead terminal by the connecting members.
2. The core structure for a square lithium secondary battery as claimed in claim 1, wherein either end of the base board is covered with a conductive sleeve, when the conductive pressing piece is pressed against the positive lead area or the negative lead area, the conductive sleeve can improve electrical connection between pressing surfaces of the positive lead area and negative lead area.
3. The core structure for a square lithium secondary battery as claimed in claim 1, wherein the conductive connecting members are a flexible wire.
CA2561342A 2006-09-28 2006-09-28 Core structure for a square lithium secondary battery Active CA2561342C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2561342A CA2561342C (en) 2006-09-28 2006-09-28 Core structure for a square lithium secondary battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2561342A CA2561342C (en) 2006-09-28 2006-09-28 Core structure for a square lithium secondary battery

Publications (2)

Publication Number Publication Date
CA2561342A1 CA2561342A1 (en) 2008-03-28
CA2561342C true CA2561342C (en) 2010-08-10

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CA2561342A1 (en) 2008-03-28

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Effective date: 20250328